diff --git a/.github/workflows/nodejs.yml b/.github/workflows/nodejs.yml
index bd8de1c3450..b676ba08207 100644
--- a/.github/workflows/nodejs.yml
+++ b/.github/workflows/nodejs.yml
@@ -13,6 +13,7 @@ jobs:
     with:
       runs-on: ubuntu-latest, windows-latest
       test-command: npm run coverage:ci
+      timeout-minutes: 15
       post-test-steps: |
         - name: Coverage Report
           uses: codecov/codecov-action@v3
@@ -22,7 +23,6 @@ jobs:
       exclude: |
         - runs-on: windows-latest
           node-version: 16
-        - node-version: 19
   automerge:
     if: >
       github.event_name == 'pull_request' && github.event.pull_request.user.login == 'dependabot[bot]'
diff --git a/.github/workflows/scorecard.yml b/.github/workflows/scorecard.yml
new file mode 100644
index 00000000000..a6affe5f2b0
--- /dev/null
+++ b/.github/workflows/scorecard.yml
@@ -0,0 +1,56 @@
+# This workflow uses actions that are not certified by GitHub. They are provided
+# by a third-party and are governed by separate terms of service, privacy
+# policy, and support documentation.
+
+name: Scorecard supply-chain security
+on:
+  # For Branch-Protection check. Only the default branch is supported. See
+  # https://github.com/ossf/scorecard/blob/main/docs/checks.md#branch-protection
+  branch_protection_rule:
+  # To guarantee Maintained check is occasionally updated. See
+  # https://github.com/ossf/scorecard/blob/main/docs/checks.md#maintained
+  schedule:
+    - cron: '16 10 * * 2'
+  push:
+    branches: [ "main" ]
+
+# Declare default permissions as read only.
+permissions: read-all
+
+jobs:
+  analysis:
+    name: Scorecard analysis
+    runs-on: ubuntu-latest
+    permissions:
+      # Needed to upload the results to code-scanning dashboard.
+      security-events: write
+      # Needed to publish results and get a badge (see publish_results below).
+      id-token: write
+
+    steps:
+      - name: "Checkout code"
+        uses: actions/checkout@93ea575cb5d8a053eaa0ac8fa3b40d7e05a33cc8 # v3.1.0
+        with:
+          persist-credentials: false
+
+      - name: "Run analysis"
+        uses: ossf/scorecard-action@80e868c13c90f172d68d1f4501dee99e2479f7af # v2.1.3
+        with:
+          results_file: results.sarif
+          results_format: sarif
+          publish_results: true
+
+      # Upload the results as artifacts (optional). Commenting out will disable uploads of run results in SARIF
+      # format to the repository Actions tab.
+      - name: "Upload artifact"
+        uses: actions/upload-artifact@3cea5372237819ed00197afe530f5a7ea3e805c8 # v3.1.0
+        with:
+          name: SARIF file
+          path: results.sarif
+          retention-days: 5
+
+      # Upload the results to GitHub's code scanning dashboard.
+      - name: "Upload to code-scanning"
+        uses: github/codeql-action/upload-sarif@04df1262e6247151b5ac09cd2c303ac36ad3f62b # v2.2.9
+        with:
+          sarif_file: results.sarif
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index d5be39b6dbe..cf7cb6932a4 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -5,6 +5,7 @@
   * [Lint](#lint)
   * [Test](#test)
   * [Coverage](#coverage)
+  * [Update `WPTs`](#update-wpts)
 * [Developer's Certificate of Origin 1.1](#developers-certificate-of-origin)
   * [Moderation Policy](#moderation-policy)
 
@@ -50,7 +51,7 @@ npm i
 > This requires [docker](https://www.docker.com/) installed on your machine.
 
 ```bash
-npm run build-wasm
+npm run build:wasm
 ```
 
 #### Copy the sources to `undici`
@@ -77,6 +78,65 @@ cd <your-path-to-undici>
 npm run build:wasm
 ```
 
+<a id="update-wpts"></a>
+### Update `WPTs`
+
+`undici` runs a subset of the [`web-platform-tests`](https://github.com/web-platform-tests/wpt).
+
+Here are the steps to update them.
+
+<details>
+<summary>Skip the tutorial</summary>
+
+```bash
+git clone --depth 1 --single-branch --branch epochs/daily --filter=blob:none --sparse https://github.com/web-platform-tests/wpt.git test/wpt/tests
+cd test/wpt/tests
+git sparse-checkout add /fetch
+git sparse-checkout add /FileAPI
+git sparse-checkout add /xhr
+git sparse-checkout add /websockets
+git sparse-checkout add /resources
+git sparse-checkout add /common
+git sparse-checkout add /mimesniff
+git sparse-checkout add /interfaces
+git sparse-checkout add /resources
+```
+</details>
+
+#### Sparse-clone the [wpt](https://github.com/web-platform-tests/wpt) repo
+
+```bash
+git clone --depth 1 --single-branch --branch epochs/daily --filter=blob:none --sparse https://github.com/web-platform-tests/wpt.git test/wpt/tests
+
+cd test/wpt/tests
+
+```
+
+#### Checkout the tests
+
+Only run the commands for the folder(s) you want to update.
+
+```bash
+git sparse-checkout add /fetch
+git sparse-checkout add /FileAPI
+git sparse-checkout add /xhr
+git sparse-checkout add /websockets
+git sparse-checkout add /resources
+git sparse-checkout add /common
+
+# etc
+```
+
+#### Run the tests
+
+Run the tests to ensure that any new failures are marked as such.
+
+You can mark tests as failing in their corresponding [status](./test/wpt/status) file.
+
+```bash
+npm run test:wpt
+```
+
 <a id="lint"></a>
 
 ### Lint
diff --git a/README.md b/README.md
index bd991008a90..05a5d21ed11 100644
--- a/README.md
+++ b/README.md
@@ -405,6 +405,18 @@ implementations in Deno and Cloudflare Workers.
 
 Refs: https://fetch.spec.whatwg.org/#atomic-http-redirect-handling
 
+## Workarounds
+
+### Network address family autoselection.
+
+If you experience problem when connecting to a remote server that is resolved by your DNS servers to a IPv6 (AAAA record)
+first, there are chances that your local router or ISP might have problem connecting to IPv6 networks. In that case
+undici will throw an error with code `UND_ERR_CONNECT_TIMEOUT`. 
+
+If the target server resolves to both a IPv6 and IPv4 (A records) address and you are using a compatible Node version 
+(18.3.0 and above), you can fix the problem by providing the `autoSelectFamily` option (support by both `undici.request`
+and `undici.Agent`) which will enable the family autoselection algorithm when establishing the connection.
+
 ## Collaborators
 
 * [__Daniele Belardi__](https://github.com/dnlup), <https://www.npmjs.com/~dnlup>
diff --git a/docs/api/Client.md b/docs/api/Client.md
index 2b5f9e526bb..fc7c5d26e8f 100644
--- a/docs/api/Client.md
+++ b/docs/api/Client.md
@@ -17,8 +17,8 @@ Returns: `Client`
 
 ### Parameter: `ClientOptions`
 
-* **bodyTimeout** `number | null` (optional) - Default: `30e3` - The timeout after which a request will time out, in milliseconds. Monitors time between receiving body data. Use `0` to disable it entirely. Defaults to 30 seconds.
-* **headersTimeout** `number | null` (optional) - Default: `30e3` - The amount of time the parser will wait to receive the complete HTTP headers while not sending the request. Defaults to 30 seconds.
+* **bodyTimeout** `number | null` (optional) - Default: `300e3` - The timeout after which a request will time out, in milliseconds. Monitors time between receiving body data. Use `0` to disable it entirely. Defaults to 300 seconds.
+* **headersTimeout** `number | null` (optional) - Default: `300e3` - The amount of time the parser will wait to receive the complete HTTP headers while not sending the request. Defaults to 300 seconds.
 * **keepAliveMaxTimeout** `number | null` (optional) - Default: `600e3` - The maximum allowed `keepAliveTimeout` when overridden by *keep-alive* hints from the server. Defaults to 10 minutes.
 * **keepAliveTimeout** `number | null` (optional) - Default: `4e3` - The timeout after which a socket without active requests will time out. Monitors time between activity on a connected socket. This value may be overridden by *keep-alive* hints from the server. See [MDN: HTTP - Headers - Keep-Alive directives](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Keep-Alive#directives) for more details. Defaults to 4 seconds.
 * **keepAliveTimeoutThreshold** `number | null` (optional) - Default: `1e3` - A number subtracted from server *keep-alive* hints when overriding `keepAliveTimeout` to account for timing inaccuracies caused by e.g. transport latency. Defaults to 1 second.
@@ -28,6 +28,8 @@ Returns: `Client`
 * **connect** `ConnectOptions | Function | null` (optional) - Default: `null`.
 * **strictContentLength** `Boolean` (optional) - Default: `true` - Whether to treat request content length mismatches as errors. If true, an error is thrown when the request content-length header doesn't match the length of the request body.
 * **interceptors** `{ Client: DispatchInterceptor[] }` - Default: `[RedirectInterceptor]` - A list of interceptors that are applied to the dispatch method. Additional logic can be applied (such as, but not limited to: 302 status code handling, authentication, cookies, compression and caching). Note that the behavior of interceptors is Experimental and might change at any given time.
+* **autoSelectFamily**: `boolean` (optional) - Default: depends on local Node version, on Node 18.13.0 and above is `false`. Enables a family autodetection algorithm that loosely implements section 5 of [RFC 8305](https://tools.ietf.org/html/rfc8305#section-5). See [here](https://nodejs.org/api/net.html#socketconnectoptions-connectlistener) for more details. This option is ignored if not supported by the current Node version.
+* **autoSelectFamilyAttemptTimeout**: `number` - Default: depends on local Node version, on Node 18.13.0 and above is `250`. The amount of time in milliseconds to wait for a connection attempt to finish before trying the next address when using the `autoSelectFamily` option. See [here](https://nodejs.org/api/net.html#socketconnectoptions-connectlistener) for more details.
 
 #### Parameter: `ConnectOptions`
 
@@ -38,6 +40,8 @@ Furthermore, the following options can be passed:
 * **maxCachedSessions** `number | null` (optional) - Default: `100` - Maximum number of TLS cached sessions. Use 0 to disable TLS session caching. Default: 100.
 * **timeout** `number | null` (optional) -  Default `10e3`
 * **servername** `string | null` (optional)
+* **keepAlive** `boolean | null` (optional) - Default: `true` - TCP keep-alive enabled
+* **keepAliveInitialDelay** `number | null` (optional) - Default: `60000` - TCP keep-alive interval for the socket in milliseconds
 
 ### Example - Basic Client instantiation
 
diff --git a/docs/api/ContentType.md b/docs/api/ContentType.md
new file mode 100644
index 00000000000..2bcc9f71ca3
--- /dev/null
+++ b/docs/api/ContentType.md
@@ -0,0 +1,57 @@
+# MIME Type Parsing
+
+## `MIMEType` interface
+
+* **type** `string`
+* **subtype** `string`
+* **parameters** `Map<string, string>`
+* **essence** `string`
+
+## `parseMIMEType(input)`
+
+Implements [parse a MIME type](https://mimesniff.spec.whatwg.org/#parse-a-mime-type).
+
+Parses a MIME type, returning its type, subtype, and any associated parameters. If the parser can't parse an input it returns the string literal `'failure'`.
+
+```js
+import { parseMIMEType } from 'undici'
+
+parseMIMEType('text/html; charset=gbk')
+// {
+//   type: 'text',
+//   subtype: 'html',
+//   parameters: Map(1) { 'charset' => 'gbk' },
+//   essence: 'text/html'
+// }
+```
+
+Arguments:
+
+* **input** `string`
+
+Returns: `MIMEType|'failure'`
+
+## `serializeAMimeType(input)`
+
+Implements [serialize a MIME type](https://mimesniff.spec.whatwg.org/#serialize-a-mime-type).
+
+Serializes a MIMEType object.
+
+```js
+import { serializeAMimeType } from 'undici'
+
+serializeAMimeType({
+  type: 'text',
+  subtype: 'html',
+  parameters: new Map([['charset', 'gbk']]),
+  essence: 'text/html'
+})
+// text/html;charset=gbk
+
+```
+
+Arguments:
+
+* **mimeType** `MIMEType`
+
+Returns: `string`
diff --git a/docs/api/Dispatcher.md b/docs/api/Dispatcher.md
index d9499bec6ed..a50642948aa 100644
--- a/docs/api/Dispatcher.md
+++ b/docs/api/Dispatcher.md
@@ -74,7 +74,7 @@ Returns: `void | Promise<ConnectData>` - Only returns a `Promise` if no `callbac
 #### Parameter: `ConnectData`
 
 * **statusCode** `number`
-* **headers** `http.IncomingHttpHeaders`
+* **headers** `Record<string, string | string[] | undefined>`
 * **socket** `stream.Duplex`
 * **opaque** `unknown`
 
@@ -192,15 +192,15 @@ Returns: `Boolean` - `false` if dispatcher is busy and further dispatch calls wo
 * **origin** `string | URL`
 * **path** `string`
 * **method** `string`
-* **reset** `boolean` (optional) - Default: `false` - Indicates whether the request should attempt to create a long-living connection by sending the `connection: keep-alive` header, or close it immediately after response by sending `connection: close`.
+* **reset** `boolean` (optional) - Default: `false` - If `false`, the request will attempt to create a long-living connection by sending the `connection: keep-alive` header,otherwise will attempt to close it immediately after response by sending `connection: close` within the request and closing the socket afterwards.
 * **body** `string | Buffer | Uint8Array | stream.Readable | Iterable | AsyncIterable | null` (optional) - Default: `null`
 * **headers** `UndiciHeaders | string[]` (optional) - Default: `null`.
 * **query** `Record<string, any> | null` (optional) - Default: `null` - Query string params to be embedded in the request URL. Note that both keys and values of query are encoded using `encodeURIComponent`. If for some reason you need to send them unencoded, embed query params into path directly instead.
 * **idempotent** `boolean` (optional) - Default: `true` if `method` is `'HEAD'` or `'GET'` - Whether the requests can be safely retried or not. If `false` the request won't be sent until all preceding requests in the pipeline has completed.
 * **blocking** `boolean` (optional) - Default: `false` - Whether the response is expected to take a long time and would end up blocking the pipeline. When this is set to `true` further pipelining will be avoided on the same connection until headers have been received.
 * **upgrade** `string | null` (optional) - Default: `null` - Upgrade the request. Should be used to specify the kind of upgrade i.e. `'Websocket'`.
-* **bodyTimeout** `number | null` (optional) - The timeout after which a request will time out, in milliseconds. Monitors time between receiving body data. Use `0` to disable it entirely. Defaults to 30 seconds.
-* **headersTimeout** `number | null` (optional) - The amount of time the parser will wait to receive the complete HTTP headers while not sending the request. Defaults to 30 seconds.
+* **bodyTimeout** `number | null` (optional) - The timeout after which a request will time out, in milliseconds. Monitors time between receiving body data. Use `0` to disable it entirely. Defaults to 300 seconds.
+* **headersTimeout** `number | null` (optional) - The amount of time the parser will wait to receive the complete HTTP headers while not sending the request. Defaults to 300 seconds.
 * **throwOnError** `boolean` (optional) - Default: `false` - Whether Undici should throw an error upon receiving a 4xx or 5xx response from the server.
 
 #### Parameter: `DispatchHandler`
@@ -383,7 +383,7 @@ Extends: [`RequestOptions`](#parameter-requestoptions)
 #### Parameter: PipelineHandlerData
 
 * **statusCode** `number`
-* **headers** `IncomingHttpHeaders`
+* **headers** `Record<string, string | string[] | undefined>`
 * **opaque** `unknown`
 * **body** `stream.Readable`
 * **context** `object`
@@ -477,7 +477,7 @@ The `RequestOptions.method` property should not be value `'CONNECT'`.
 #### Parameter: `ResponseData`
 
 * **statusCode** `number`
-* **headers** `http.IncomingHttpHeaders` - Note that all header keys are lower-cased, e. g. `content-type`.
+* **headers** `Record<string, string | string[]>` - Note that all header keys are lower-cased, e. g. `content-type`.
 * **body** `stream.Readable` which also implements [the body mixin from the Fetch Standard](https://fetch.spec.whatwg.org/#body-mixin).
 * **trailers** `Record<string, string>` - This object starts out
   as empty and will be mutated to contain trailers after `body` has emitted `'end'`.
@@ -631,7 +631,7 @@ try {
 
 A faster version of `Dispatcher.request`. This method expects the second argument `factory` to return a [`stream.Writable`](https://nodejs.org/api/stream.html#stream_class_stream_writable) stream which the response will be written to. This improves performance by avoiding creating an intermediate [`stream.Readable`](https://nodejs.org/api/stream.html#stream_readable_streams) stream when the user expects to directly pipe the response body to a [`stream.Writable`](https://nodejs.org/api/stream.html#stream_class_stream_writable) stream.
 
-As demonstrated in [Example 1 - Basic GET stream request](#example-1-basic-get-stream-request), it is recommended to use the `option.opaque` property to avoid creating a closure for the `factory` method. This pattern works well with Node.js Web Frameworks such as [Fastify](https://fastify.io). See [Example 2 - Stream to Fastify Response](#example-2-stream-to-fastify-response) for more details.
+As demonstrated in [Example 1 - Basic GET stream request](#example-1---basic-get-stream-request), it is recommended to use the `option.opaque` property to avoid creating a closure for the `factory` method. This pattern works well with Node.js Web Frameworks such as [Fastify](https://fastify.io). See [Example 2 - Stream to Fastify Response](#example-2---stream-to-fastify-response) for more details.
 
 Arguments:
 
@@ -644,7 +644,7 @@ Returns: `void | Promise<StreamData>` - Only returns a `Promise` if no `callback
 #### Parameter: `StreamFactoryData`
 
 * **statusCode** `number`
-* **headers** `http.IncomingHttpHeaders`
+* **headers** `Record<string, string | string[] | undefined>`
 * **opaque** `unknown`
 * **onInfo** `({statusCode: number, headers: Record<string, string | string[]>}) => void | null` (optional) - Default: `null` - Callback collecting all the info headers (HTTP 100-199) received.
 
@@ -853,9 +853,9 @@ Emitted when dispatcher is no longer busy.
 
 ## Parameter: `UndiciHeaders`
 
-* `http.IncomingHttpHeaders | string[] | null`
+* `Record<string, string | string[] | undefined> | string[] | null`
 
-Header arguments such as `options.headers` in [`Client.dispatch`](Client.md#clientdispatchoptions-handlers) can be specified in two forms; either as an object specified by the `http.IncomingHttpHeaders` type, or an array of strings. An array representation of a header list must have an even length or an `InvalidArgumentError` will be thrown.
+Header arguments such as `options.headers` in [`Client.dispatch`](Client.md#clientdispatchoptions-handlers) can be specified in two forms; either as an object specified by the `Record<string, string | string[] | undefined>` (`IncomingHttpHeaders`) type, or an array of strings. An array representation of a header list must have an even length or an `InvalidArgumentError` will be thrown.
 
 Keys are lowercase and values are not modified.
 
diff --git a/docs/api/MockPool.md b/docs/api/MockPool.md
index c86f9a30adb..923c157aa64 100644
--- a/docs/api/MockPool.md
+++ b/docs/api/MockPool.md
@@ -63,7 +63,8 @@ Returns: `MockInterceptor` corresponding to the input options.
 
 We can define the behaviour of an intercepted request with the following options.
 
-* **reply** `(statusCode: number, replyData: string | Buffer | object | MockInterceptor.MockResponseDataHandler, responseOptions?: MockResponseOptions) => MockScope` - define a reply for a matching request. You can define this as a callback to read incoming request data. Default for `responseOptions` is `{}`.
+* **reply** `(statusCode: number, replyData: string | Buffer | object | MockInterceptor.MockResponseDataHandler, responseOptions?: MockResponseOptions) => MockScope` - define a reply for a matching request. You can define the replyData as a callback to read incoming request data. Default for `responseOptions` is `{}`.
+* **reply** `(callback: MockInterceptor.MockReplyOptionsCallback) => MockScope` - define a reply for a matching request, allowing dynamic mocking of all reply options rather than just the data.
 * **replyWithError** `(error: Error) => MockScope` - define an error for a matching request to throw.
 * **defaultReplyHeaders** `(headers: Record<string, string>) => MockInterceptor` - define default headers to be included in subsequent replies. These are in addition to headers on a specific reply.
 * **defaultReplyTrailers** `(trailers: Record<string, string>) => MockInterceptor` - define default trailers to be included in subsequent replies. These are in addition to trailers on a specific reply.
diff --git a/docs/api/ProxyAgent.md b/docs/api/ProxyAgent.md
index 05d67a094cf..6a8b07fe6bf 100644
--- a/docs/api/ProxyAgent.md
+++ b/docs/api/ProxyAgent.md
@@ -19,6 +19,7 @@ Extends: [`AgentOptions`](Agent.md#parameter-agentoptions)
 * **uri** `string` (required) - It can be passed either by a string or a object containing `uri` as string.
 * **token** `string` (optional) - It can be passed by a string of token for authentication.
 * **auth** `string` (**deprecated**) - Use token.
+* **clientFactory** `(origin: URL, opts: Object) => Dispatcher` - Default: `(origin, opts) => new Pool(origin, opts)`
 
 Examples:
 
@@ -83,7 +84,8 @@ import { setGlobalDispatcher, request, ProxyAgent } from 'undici';
 
 const proxyAgent = new ProxyAgent({
   uri: 'my.proxy.server',
-  token: 'Bearer xxxx'
+  // token: 'Bearer xxxx'
+  token: `Basic ${Buffer.from('username:password').toString('base64')}`
 });
 setGlobalDispatcher(proxyAgent);
 
diff --git a/docsify/sidebar.md b/docsify/sidebar.md
index 6c110f47f6e..015e6f48842 100644
--- a/docsify/sidebar.md
+++ b/docsify/sidebar.md
@@ -19,6 +19,7 @@
   * [API Lifecycle](/docs/api/api-lifecycle.md "Undici API - Lifecycle")
   * [Diagnostics Channel Support](/docs/api/DiagnosticsChannel.md "Diagnostics Channel Support")
   * [WebSocket](/docs/api/WebSocket.md "Undici API - WebSocket")
+  * [MIME Type Parsing](/docs/api/ContentType.md "Undici API - MIME Type Parsing")
 * Best Practices
   * [Proxy](/docs/best-practices/proxy.md "Connecting through a proxy")
   * [Client Certificate](/docs/best-practices/client-certificate.md "Connect using a client certificate")
diff --git a/index.d.ts b/index.d.ts
index e914634f1d0..d67de97241d 100644
--- a/index.d.ts
+++ b/index.d.ts
@@ -23,6 +23,7 @@ export * from './types/filereader'
 export * from './types/formdata'
 export * from './types/diagnostics-channel'
 export * from './types/websocket'
+export * from './types/content-type'
 export { Interceptable } from './types/mock-interceptor'
 
 export { Dispatcher, BalancedPool, Pool, Client, buildConnector, errors, Agent, request, stream, pipeline, connect, upgrade, setGlobalDispatcher, getGlobalDispatcher, setGlobalOrigin, getGlobalOrigin, MockClient, MockPool, MockAgent, mockErrors, ProxyAgent, RedirectHandler, DecoratorHandler }
diff --git a/index.js b/index.js
index 3e5be33f3e0..02ac246fa45 100644
--- a/index.js
+++ b/index.js
@@ -20,9 +20,13 @@ const DecoratorHandler = require('./lib/handler/DecoratorHandler')
 const RedirectHandler = require('./lib/handler/RedirectHandler')
 const createRedirectInterceptor = require('./lib/interceptor/redirectInterceptor')
 
-const nodeVersion = process.versions.node.split('.')
-const nodeMajor = Number(nodeVersion[0])
-const nodeMinor = Number(nodeVersion[1])
+let hasCrypto
+try {
+  require('crypto')
+  hasCrypto = true
+} catch {
+  hasCrypto = false
+}
 
 Object.assign(Dispatcher.prototype, api)
 
@@ -92,7 +96,7 @@ function makeDispatcher (fn) {
 module.exports.setGlobalDispatcher = setGlobalDispatcher
 module.exports.getGlobalDispatcher = getGlobalDispatcher
 
-if (nodeMajor > 16 || (nodeMajor === 16 && nodeMinor >= 8)) {
+if (util.nodeMajor > 16 || (util.nodeMajor === 16 && util.nodeMinor >= 8)) {
   let fetchImpl = null
   module.exports.fetch = async function fetch (resource) {
     if (!fetchImpl) {
@@ -119,16 +123,21 @@ if (nodeMajor > 16 || (nodeMajor === 16 && nodeMinor >= 8)) {
   module.exports.getGlobalOrigin = getGlobalOrigin
 }
 
-if (nodeMajor >= 16) {
+if (util.nodeMajor >= 16) {
   const { deleteCookie, getCookies, getSetCookies, setCookie } = require('./lib/cookies')
 
   module.exports.deleteCookie = deleteCookie
   module.exports.getCookies = getCookies
   module.exports.getSetCookies = getSetCookies
   module.exports.setCookie = setCookie
+
+  const { parseMIMEType, serializeAMimeType } = require('./lib/fetch/dataURL')
+
+  module.exports.parseMIMEType = parseMIMEType
+  module.exports.serializeAMimeType = serializeAMimeType
 }
 
-if (nodeMajor >= 18) {
+if (util.nodeMajor >= 18 && hasCrypto) {
   const { WebSocket } = require('./lib/websocket/websocket')
 
   module.exports.WebSocket = WebSocket
diff --git a/lib/api/api-stream.js b/lib/api/api-stream.js
index f33f459f9d4..7560a2e6505 100644
--- a/lib/api/api-stream.js
+++ b/lib/api/api-stream.js
@@ -1,10 +1,11 @@
 'use strict'
 
-const { finished } = require('stream')
+const { finished, PassThrough } = require('stream')
 const {
   InvalidArgumentError,
   InvalidReturnValueError,
-  RequestAbortedError
+  RequestAbortedError,
+  ResponseStatusCodeError
 } = require('../core/errors')
 const util = require('../core/util')
 const { AsyncResource } = require('async_hooks')
@@ -16,7 +17,7 @@ class StreamHandler extends AsyncResource {
       throw new InvalidArgumentError('invalid opts')
     }
 
-    const { signal, method, opaque, body, onInfo, responseHeaders } = opts
+    const { signal, method, opaque, body, onInfo, responseHeaders, throwOnError } = opts
 
     try {
       if (typeof callback !== 'function') {
@@ -57,6 +58,7 @@ class StreamHandler extends AsyncResource {
     this.trailers = null
     this.body = body
     this.onInfo = onInfo || null
+    this.throwOnError = throwOnError || false
 
     if (util.isStream(body)) {
       body.on('error', (err) => {
@@ -76,8 +78,8 @@ class StreamHandler extends AsyncResource {
     this.context = context
   }
 
-  onHeaders (statusCode, rawHeaders, resume) {
-    const { factory, opaque, context } = this
+  onHeaders (statusCode, rawHeaders, resume, statusMessage) {
+    const { factory, opaque, context, callback } = this
 
     if (statusCode < 200) {
       if (this.onInfo) {
@@ -96,6 +98,32 @@ class StreamHandler extends AsyncResource {
       context
     })
 
+    if (this.throwOnError && statusCode >= 400) {
+      const headers = this.responseHeaders === 'raw' ? util.parseRawHeaders(rawHeaders) : util.parseHeaders(rawHeaders)
+      const chunks = []
+      const pt = new PassThrough()
+      pt
+        .on('data', (chunk) => chunks.push(chunk))
+        .on('end', () => {
+          const payload = Buffer.concat(chunks).toString('utf8')
+          this.runInAsyncScope(
+            callback,
+            null,
+            new ResponseStatusCodeError(
+              `Response status code ${statusCode}${statusMessage ? `: ${statusMessage}` : ''}`,
+              statusCode,
+              headers,
+              payload
+            )
+          )
+        })
+        .on('error', (err) => {
+          this.onError(err)
+        })
+      this.res = pt
+      return
+    }
+
     if (
       !res ||
       typeof res.write !== 'function' ||
diff --git a/lib/api/readable.js b/lib/api/readable.js
index 9c184d14e1c..a184e8eb51b 100644
--- a/lib/api/readable.js
+++ b/lib/api/readable.js
@@ -4,7 +4,7 @@
 
 const assert = require('assert')
 const { Readable } = require('stream')
-const { RequestAbortedError, NotSupportedError } = require('../core/errors')
+const { RequestAbortedError, NotSupportedError, InvalidArgumentError } = require('../core/errors')
 const util = require('../core/util')
 const { ReadableStreamFrom, toUSVString } = require('../core/util')
 
@@ -146,15 +146,31 @@ module.exports = class BodyReadable extends Readable {
 
   async dump (opts) {
     let limit = opts && Number.isFinite(opts.limit) ? opts.limit : 262144
+    const signal = opts && opts.signal
+    const abortFn = () => {
+      this.destroy()
+    }
+    if (signal) {
+      if (typeof signal !== 'object' || !('aborted' in signal)) {
+        throw new InvalidArgumentError('signal must be an AbortSignal')
+      }
+      util.throwIfAborted(signal)
+      signal.addEventListener('abort', abortFn, { once: true })
+    }
     try {
       for await (const chunk of this) {
+        util.throwIfAborted(signal)
         limit -= Buffer.byteLength(chunk)
         if (limit < 0) {
           return
         }
       }
     } catch {
-      // Do nothing...
+      util.throwIfAborted(signal)
+    } finally {
+      if (signal) {
+        signal.removeEventListener('abort', abortFn)
+      }
     }
   }
 }
diff --git a/lib/client.js b/lib/client.js
index 1625b47eafe..e5d8f98d1cf 100644
--- a/lib/client.js
+++ b/lib/client.js
@@ -1,10 +1,14 @@
+// @ts-check
+
 'use strict'
 
 /* global WebAssembly */
 
 const assert = require('assert')
 const net = require('net')
+const http2 = require('http2')
 const util = require('./core/util')
+const timers = require('./timers')
 const Request = require('./core/request')
 const DispatcherBase = require('./dispatcher-base')
 const {
@@ -63,8 +67,12 @@ const {
   kDispatch,
   kInterceptors,
   kLocalAddress,
-  kMaxResponseSize
+  kMaxResponseSize,
+  // HTTP2
+  kHost,
+  kHTTP2Session,
 } = require('./core/symbols')
+const FastBuffer = Buffer[Symbol.species]
 
 const kClosedResolve = Symbol('kClosedResolve')
 
@@ -83,7 +91,15 @@ try {
   channels.connected = { hasSubscribers: false }
 }
 
+/**
+ * @type {import('../types/client').default}
+ */
 class Client extends DispatcherBase {
+  /**
+   *
+   * @param {string|URL} url
+   * @param {import('../types/client').Client.Options} options
+   */
   constructor (url, {
     interceptors,
     maxHeaderSize,
@@ -107,7 +123,9 @@ class Client extends DispatcherBase {
     connect,
     maxRequestsPerClient,
     localAddress,
-    maxResponseSize
+    maxResponseSize,
+    autoSelectFamily,
+    autoSelectFamilyAttemptTimeout
   } = {}) {
     super()
 
@@ -183,12 +201,20 @@ class Client extends DispatcherBase {
       throw new InvalidArgumentError('maxResponseSize must be a positive number')
     }
 
+    if (
+      autoSelectFamilyAttemptTimeout != null &&
+      (!Number.isInteger(autoSelectFamilyAttemptTimeout) || autoSelectFamilyAttemptTimeout < -1)
+    ) {
+      throw new InvalidArgumentError('autoSelectFamilyAttemptTimeout must be a positive number')
+    }
+
     if (typeof connect !== 'function') {
       connect = buildConnector({
         ...tls,
         maxCachedSessions,
         socketPath,
         timeout: connectTimeout,
+        ...(util.nodeHasAutoSelectFamily && autoSelectFamily ? { autoSelectFamily, autoSelectFamilyAttemptTimeout } : undefined),
         ...connect
       })
     }
@@ -210,14 +236,18 @@ class Client extends DispatcherBase {
     this[kResuming] = 0 // 0, idle, 1, scheduled, 2 resuming
     this[kNeedDrain] = 0 // 0, idle, 1, scheduled, 2 resuming
     this[kHostHeader] = `host: ${this[kUrl].hostname}${this[kUrl].port ? `:${this[kUrl].port}` : ''}\r\n`
-    this[kBodyTimeout] = bodyTimeout != null ? bodyTimeout : 30e3
-    this[kHeadersTimeout] = headersTimeout != null ? headersTimeout : 30e3
+    this[kBodyTimeout] = bodyTimeout != null ? bodyTimeout : 300e3
+    this[kHeadersTimeout] = headersTimeout != null ? headersTimeout : 300e3
     this[kStrictContentLength] = strictContentLength == null ? true : strictContentLength
     this[kMaxRedirections] = maxRedirections
     this[kMaxRequests] = maxRequestsPerClient
     this[kClosedResolve] = null
     this[kMaxResponseSize] = maxResponseSize > -1 ? maxResponseSize : -1
 
+    // HTTP/2
+    this[kHTTP2Session] = null
+    this[kHost] = `${this[kUrl].hostname}${this[kUrl].port ? `:${this[kUrl].port}` : ''}`
+
     // kQueue is built up of 3 sections separated by
     // the kRunningIdx and kPendingIdx indices.
     // |   complete   |   running   |   pending   |
@@ -332,6 +362,15 @@ class Client extends DispatcherBase {
   }
 }
 
+
+function onHttp2SessionError (err) {
+  assert(err.code !== 'ERR_TLS_CERT_ALTNAME_INVALID')
+
+  this[kError] = err
+
+  onError(this[kClient], err)
+}
+
 const constants = require('./llhttp/constants')
 const createRedirectInterceptor = require('./interceptor/redirectInterceptor')
 const EMPTY_BUF = Buffer.alloc(0)
@@ -362,9 +401,8 @@ async function lazyllhttp () {
       },
       wasm_on_status: (p, at, len) => {
         assert.strictEqual(currentParser.ptr, p)
-        const start = at - currentBufferPtr
-        const end = start + len
-        return currentParser.onStatus(currentBufferRef.slice(start, end)) || 0
+        const start = at - currentBufferPtr + currentBufferRef.byteOffset
+        return currentParser.onStatus(new FastBuffer(currentBufferRef.buffer, start, len)) || 0
       },
       wasm_on_message_begin: (p) => {
         assert.strictEqual(currentParser.ptr, p)
@@ -372,15 +410,13 @@ async function lazyllhttp () {
       },
       wasm_on_header_field: (p, at, len) => {
         assert.strictEqual(currentParser.ptr, p)
-        const start = at - currentBufferPtr
-        const end = start + len
-        return currentParser.onHeaderField(currentBufferRef.slice(start, end)) || 0
+        const start = at - currentBufferPtr + currentBufferRef.byteOffset
+        return currentParser.onHeaderField(new FastBuffer(currentBufferRef.buffer, start, len)) || 0
       },
       wasm_on_header_value: (p, at, len) => {
         assert.strictEqual(currentParser.ptr, p)
-        const start = at - currentBufferPtr
-        const end = start + len
-        return currentParser.onHeaderValue(currentBufferRef.slice(start, end)) || 0
+        const start = at - currentBufferPtr + currentBufferRef.byteOffset
+        return currentParser.onHeaderValue(new FastBuffer(currentBufferRef.buffer, start, len)) || 0
       },
       wasm_on_headers_complete: (p, statusCode, upgrade, shouldKeepAlive) => {
         assert.strictEqual(currentParser.ptr, p)
@@ -388,9 +424,8 @@ async function lazyllhttp () {
       },
       wasm_on_body: (p, at, len) => {
         assert.strictEqual(currentParser.ptr, p)
-        const start = at - currentBufferPtr
-        const end = start + len
-        return currentParser.onBody(currentBufferRef.slice(start, end)) || 0
+        const start = at - currentBufferPtr + currentBufferRef.byteOffset
+        return currentParser.onBody(new FastBuffer(currentBufferRef.buffer, start, len)) || 0
       },
       wasm_on_message_complete: (p) => {
         assert.strictEqual(currentParser.ptr, p)
@@ -404,8 +439,7 @@ async function lazyllhttp () {
 
 let llhttpInstance = null
 let llhttpPromise = lazyllhttp()
-  .catch(() => {
-  })
+llhttpPromise.catch()
 
 let currentParser = null
 let currentBufferRef = null
@@ -441,15 +475,16 @@ class Parser {
 
     this.keepAlive = ''
     this.contentLength = ''
+    this.connection = ''
     this.maxResponseSize = client[kMaxResponseSize]
   }
 
   setTimeout (value, type) {
     this.timeoutType = type
     if (value !== this.timeoutValue) {
-      clearTimeout(this.timeout)
+      timers.clearTimeout(this.timeout)
       if (value) {
-        this.timeout = setTimeout(onParserTimeout, value, this)
+        this.timeout = timers.setTimeout(onParserTimeout, value, this)
         // istanbul ignore else: only for jest
         if (this.timeout.unref) {
           this.timeout.unref()
@@ -565,7 +600,7 @@ class Parser {
     this.llhttp.llhttp_free(this.ptr)
     this.ptr = null
 
-    clearTimeout(this.timeout)
+    timers.clearTimeout(this.timeout)
     this.timeout = null
     this.timeoutValue = null
     this.timeoutType = null
@@ -616,6 +651,8 @@ class Parser {
     const key = this.headers[len - 2]
     if (key.length === 10 && key.toString().toLowerCase() === 'keep-alive') {
       this.keepAlive += buf.toString()
+    } else if (key.length === 10 && key.toString().toLowerCase() === 'connection') {
+      this.connection += buf.toString()
     } else if (key.length === 14 && key.toString().toLowerCase() === 'content-length') {
       this.contentLength += buf.toString()
     }
@@ -709,7 +746,11 @@ class Parser {
     assert.strictEqual(this.timeoutType, TIMEOUT_HEADERS)
 
     this.statusCode = statusCode
-    this.shouldKeepAlive = shouldKeepAlive
+    this.shouldKeepAlive = (
+      shouldKeepAlive ||
+      // Override llhttp value which does not allow keepAlive for HEAD.
+      (request.method === 'HEAD' && !socket[kReset] && this.connection.toLowerCase() === 'keep-alive')
+    )
 
     if (this.statusCode >= 200) {
       const bodyTimeout = request.bodyTimeout != null
@@ -739,7 +780,7 @@ class Parser {
     this.headers = []
     this.headersSize = 0
 
-    if (shouldKeepAlive && client[kPipelining]) {
+    if (this.shouldKeepAlive && client[kPipelining]) {
       const keepAliveTimeout = this.keepAlive ? util.parseKeepAliveTimeout(this.keepAlive) : null
 
       if (keepAliveTimeout != null) {
@@ -769,7 +810,6 @@ class Parser {
     }
 
     if (request.method === 'HEAD') {
-      assert(socket[kReset])
       return 1
     }
 
@@ -843,6 +883,7 @@ class Parser {
     this.bytesRead = 0
     this.contentLength = ''
     this.keepAlive = ''
+    this.connection = ''
 
     assert(this.headers.length % 2 === 0)
     this.headers = []
@@ -969,14 +1010,16 @@ function onSocketEnd () {
 function onSocketClose () {
   const { [kClient]: client } = this
 
-  if (!this[kError] && this[kParser].statusCode && !this[kParser].shouldKeepAlive) {
-    // We treat all incoming data so far as a valid response.
-    this[kParser].onMessageComplete()
+  if (!this[kHTTP2Session]) {
+    if (!this[kError] && this[kParser].statusCode && !this[kParser].shouldKeepAlive) {
+      // We treat all incoming data so far as a valid response.
+      this[kParser].onMessageComplete()
+    }
+  
+    this[kParser].destroy()
+    this[kParser] = null
   }
 
-  this[kParser].destroy()
-  this[kParser] = null
-
   const err = this[kError] || new SocketError('closed', util.getSocketInfo(this))
 
   client[kSocket] = null
@@ -1058,31 +1101,45 @@ async function connect (client) {
       })
     })
 
-    if (!llhttpInstance) {
-      llhttpInstance = await llhttpPromise
-      llhttpPromise = null
-    }
-
     client[kConnecting] = false
 
     assert(socket)
 
-    client[kSocket] = socket
+    if (socket.alpnProtocol === 'h2') {
+      const session = http2.connect(client[kUrl], {
+        createConnection: () => socket
+      })
 
-    socket[kNoRef] = false
-    socket[kWriting] = false
-    socket[kReset] = false
-    socket[kBlocking] = false
-    socket[kError] = null
-    socket[kParser] = new Parser(client, socket, llhttpInstance)
-    socket[kClient] = client
-    socket[kCounter] = 0
-    socket[kMaxRequests] = client[kMaxRequests]
-    socket
-      .on('error', onSocketError)
-      .on('readable', onSocketReadable)
-      .on('end', onSocketEnd)
-      .on('close', onSocketClose)
+      session[kError] = null
+      session[kClient] = client
+      session.on('error', onHttp2SessionError)
+      session.on('close', onSocketClose)
+      session.unref()
+
+      client[kHTTP2Session] = session
+    } else {
+      if (!llhttpInstance) {
+        llhttpInstance = await llhttpPromise
+        llhttpPromise = null
+      }
+  
+      socket[kNoRef] = false
+      socket[kWriting] = false
+      socket[kReset] = false
+      socket[kBlocking] = false
+      socket[kError] = null
+      socket[kParser] = new Parser(client, socket, llhttpInstance)
+      socket[kClient] = client
+      socket[kCounter] = 0
+      socket[kMaxRequests] = client[kMaxRequests]
+      socket
+        .on('error', onSocketError)
+        .on('readable', onSocketReadable)
+        .on('end', onSocketEnd)
+        .on('close', onSocketClose)
+    }
+
+    client[kSocket] = socket
 
     if (channels.connected.hasSubscribers) {
       channels.connected.publish({
@@ -1169,7 +1226,7 @@ function _resume (client, sync) {
 
     const socket = client[kSocket]
 
-    if (socket) {
+    if (socket && !socket.destroyed && socket.alpnProtocol !== 'h2') {
       if (client[kSize] === 0) {
         if (!socket[kNoRef] && socket.unref) {
           socket.unref()
@@ -1234,12 +1291,14 @@ function _resume (client, sync) {
       return
     }
 
-    if (!socket) {
+    if (!socket && !client[kHTTP2Session]) {
       connect(client)
-      continue
+      return
     }
 
-    if (socket.destroyed || socket[kWriting] || socket[kReset] || socket[kBlocking]) {
+    if ((socket.destroyed || socket[kWriting] || socket[kReset] || socket[kBlocking]) ||
+      (client[kHTTP2Session] && client[kHTTP2Session].destroyed)) {
+      // TODO(HTTP/2): what if exceeds max concurrent streams or can't accept new
       return
     }
 
@@ -1295,6 +1354,12 @@ function _resume (client, sync) {
 }
 
 function write (client, request) {
+  if (client[kHTTP2Session]) {
+    console.log('http/2')
+    writeH2(client, client[kHTTP2Session], request)
+    return
+  }
+
   const { body, method, path, host, upgrade, headers, blocking, reset } = request
 
   // https://tools.ietf.org/html/rfc7231#section-4.3.1
@@ -1376,8 +1441,8 @@ function write (client, request) {
     socket[kReset] = true
   }
 
-  if (reset) {
-    socket[kReset] = true
+  if (reset != null) {
+    socket[kReset] = reset
   }
 
   if (client[kMaxRequests] && socket[kCounter]++ >= client[kMaxRequests]) {
@@ -1450,6 +1515,155 @@ function write (client, request) {
   return true
 }
 
+function writeH2 (client, session, request) {
+  // TODO(HTTP/2): upgrade is not supported in HTTP/2
+  const { body, method, path, host, upgrade } = request
+
+  // https://tools.ietf.org/html/rfc7231#section-4.3.1
+  // https://tools.ietf.org/html/rfc7231#section-4.3.2
+  // https://tools.ietf.org/html/rfc7231#section-4.3.5
+
+  // Sending a payload body on a request that does not
+  // expect it can cause undefined behavior on some
+  // servers and corrupt connection state. Do not
+  // re-use the connection for further requests.
+
+
+  const expectsPayload = (
+    method === 'PUT' ||
+    method === 'POST' ||
+    method === 'PATCH'
+  )
+
+  if (body && typeof body.read === 'function') {
+    // Try to read EOF in order to get length.
+    body.read(0)
+  }
+
+  let contentLength = util.bodyLength(body)
+
+  if (contentLength == null) {
+    contentLength = request.contentLength
+  }
+
+  if (contentLength === 0 || !expectsPayload) {
+    // https://tools.ietf.org/html/rfc7230#section-3.3.2
+    // A user agent SHOULD NOT send a Content-Length header field when
+    // the request message does not contain a payload body and the method
+    // semantics do not anticipate such a body.
+
+    contentLength = null
+  }
+
+  if (request.contentLength != null && request.contentLength !== contentLength) {
+    if (client[kStrictContentLength]) {
+      errorRequest(client, request, new RequestContentLengthMismatchError())
+      return false
+    }
+
+    process.emitWarning(new RequestContentLengthMismatchError())
+  }
+
+  try {
+    // TODO(HTTP/2): Should we call onConnect immediately or on stream ready event?
+    request.onConnect((err) => {
+      if (request.aborted || request.completed) {
+        return
+      }
+
+      errorRequest(client, request, err || new RequestAbortedError())
+    })
+  } catch (err) {
+    errorRequest(client, request, err)
+  }
+
+  if (request.aborted) {
+    return false
+  }
+
+  const headers = { ...request.headers }
+  headers[':authority'] = host || client[kHost]
+  headers[':path'] = path
+
+  // TODO(HTTP/2): Expect: 100-continue
+
+  /* istanbul ignore else: assertion */
+  if (!body) {
+    if (contentLength === 0) {
+      headers['content-length'] = '0'
+    } else {
+      assert(contentLength == null, 'no body must not have content length')
+    }
+  } else if (util.isBuffer(body)) {
+    assert(contentLength === body.byteLength, 'buffer body must have content length')
+
+    headers['content-length'] = String(contentLength)
+
+    process.nextTick(() => {
+      stream.end(body)
+      request.onBodySent(body)
+    })
+  } else if (util.isBlob(body)) {
+    process.nextTick(() => {
+      writeBlob({ client, request, stream, contentLength, expectsPayload })
+    })
+  } else if (util.isStream(body)) {
+    process.nextTick(() => {
+      writeStream({ client, request, stream, contentLength, expectsPayload })
+    })
+  } else if (util.isIterable(body)) {
+    process.nextTick(() => {
+      writeIterable({ client, request, stream, contentLength, expectsPayload })
+    })
+  } else {
+    assert(false)
+  }
+
+  console.log('http/2 request')
+  // TODO(HTTP/2): ref only if current streams count is 0
+  session.ref()
+  // TODO(HTTP/2): The handler expects an array but the native http2 module provides us with an object. What should we do?
+  const stream = session.request(headers)
+
+  stream.on('response', headers => {
+    if (request.onHeaders(Number(headers[':status']), headers, stream.resume.bind(stream), '') === false) {
+      stream.pause()
+    }
+  })
+
+  stream.on('data', chunk => {
+    if (request.onData(chunk) === false) {
+      stream.pause()
+    }
+  })
+
+  stream.on('trailers', headers => {
+    // TODO(HTTP/2): Suppor trailers
+  })
+  stream.on('end', () => {
+    request.onComplete([])
+  })
+  
+  stream.on('aborted', () => {
+    // TODO(HTTP/2): Support aborted
+  })
+
+  stream.on('ready', () => {
+    // TODO(HTTP/2): Support ready
+  })
+
+  stream.on('timeout', () => {
+    // TODO(HTTP/2): Support timeout
+  })
+
+  stream.on('close', () => {
+    // TODO(HTTP/2): unref only if current streams count is 0
+    session.unref()
+  })
+
+  return true
+}
+
 function writeStream ({ body, client, request, socket, contentLength, header, expectsPayload }) {
   assert(contentLength !== 0 || client[kRunning] === 0, 'stream body cannot be pipelined')
 
@@ -1644,6 +1858,8 @@ class AsyncWriter {
       process.emitWarning(new RequestContentLengthMismatchError())
     }
 
+    socket.cork()
+
     if (bytesWritten === 0) {
       if (!expectsPayload) {
         socket[kReset] = true
@@ -1664,6 +1880,8 @@ class AsyncWriter {
 
     const ret = socket.write(chunk)
 
+    socket.uncork()
+
     request.onBodySent(chunk)
 
     if (!ret) {
diff --git a/lib/cookies/index.js b/lib/cookies/index.js
index def04f5bc4a..c9c1f28ee1f 100644
--- a/lib/cookies/index.js
+++ b/lib/cookies/index.js
@@ -83,7 +83,8 @@ function getSetCookies (headers) {
     return []
   }
 
-  return cookies.map((pair) => parseSetCookie(pair[1]))
+  // In older versions of undici, cookies is a list of name:value.
+  return cookies.map((pair) => parseSetCookie(Array.isArray(pair) ? pair[1] : pair))
 }
 
 /**
diff --git a/lib/cookies/parse.js b/lib/cookies/parse.js
index 6a1e37be6b7..aae2750360b 100644
--- a/lib/cookies/parse.js
+++ b/lib/cookies/parse.js
@@ -2,7 +2,7 @@
 
 const { maxNameValuePairSize, maxAttributeValueSize } = require('./constants')
 const { isCTLExcludingHtab } = require('./util')
-const { collectASequenceOfCodePoints } = require('../fetch/dataURL')
+const { collectASequenceOfCodePointsFast } = require('../fetch/dataURL')
 const assert = require('assert')
 
 /**
@@ -32,7 +32,7 @@ function parseSetCookie (header) {
     //    (including the %x3B (";") in question).
     const position = { position: 0 }
 
-    nameValuePair = collectASequenceOfCodePoints((char) => char !== ';', header, position)
+    nameValuePair = collectASequenceOfCodePointsFast(';', header, position)
     unparsedAttributes = header.slice(position.position)
   } else {
     // Otherwise:
@@ -54,8 +54,8 @@ function parseSetCookie (header) {
     //    empty) value string consists of the characters after the first
     //    %x3D ("=") character.
     const position = { position: 0 }
-    name = collectASequenceOfCodePoints(
-      (char) => char !== '=',
+    name = collectASequenceOfCodePointsFast(
+      '=',
       nameValuePair,
       position
     )
@@ -106,8 +106,8 @@ function parseUnparsedAttributes (unparsedAttributes, cookieAttributeList = {})
   if (unparsedAttributes.includes(';')) {
     // 1. Consume the characters of the unparsed-attributes up to, but
     //    not including, the first %x3B (";") character.
-    cookieAv = collectASequenceOfCodePoints(
-      (char) => char !== ';',
+    cookieAv = collectASequenceOfCodePointsFast(
+      ';',
       unparsedAttributes,
       { position: 0 }
     )
@@ -134,8 +134,8 @@ function parseUnparsedAttributes (unparsedAttributes, cookieAttributeList = {})
     //    character.
     const position = { position: 0 }
 
-    attributeName = collectASequenceOfCodePoints(
-      (char) => char !== '=',
+    attributeName = collectASequenceOfCodePointsFast(
+      '=',
       cookieAv,
       position
     )
diff --git a/lib/core/connect.js b/lib/core/connect.js
index 89561f16fbe..b63786bae7f 100644
--- a/lib/core/connect.js
+++ b/lib/core/connect.js
@@ -99,6 +99,8 @@ function buildConnector ({ maxCachedSessions, socketPath, timeout, ...opts }) {
         servername,
         session,
         localAddress,
+        // TODO(HTTP/2): Should we support h2c?
+        ALPNProtocols: ['h2', 'http/1.1'],
         socket: httpSocket, // upgrade socket connection
         port: port || 443,
         host: hostname
@@ -120,6 +122,12 @@ function buildConnector ({ maxCachedSessions, socketPath, timeout, ...opts }) {
       })
     }
 
+    // Set TCP keep alive options on the socket here instead of in connect() for the case of assigning the socket
+    if (options.keepAlive == null || options.keepAlive) {
+      const keepAliveInitialDelay = options.keepAliveInitialDelay === undefined ? 60e3 : options.keepAliveInitialDelay
+      socket.setKeepAlive(true, keepAliveInitialDelay)
+    }
+
     const cancelTimeout = setupTimeout(() => onConnectTimeout(socket), timeout)
 
     socket
diff --git a/lib/core/request.js b/lib/core/request.js
index e8a8f2a43dc..c82159e5ba0 100644
--- a/lib/core/request.js
+++ b/lib/core/request.js
@@ -34,10 +34,6 @@ const channels = {}
 
 let extractBody
 
-const nodeVersion = process.versions.node.split('.')
-const nodeMajor = Number(nodeVersion[0])
-const nodeMinor = Number(nodeVersion[1])
-
 try {
   const diagnosticsChannel = require('diagnostics_channel')
   channels.create = diagnosticsChannel.channel('undici:request:create')
@@ -144,7 +140,7 @@ class Request {
 
     this.blocking = blocking == null ? false : blocking
 
-    this.reset = reset == null ? false : reset
+    this.reset = reset == null ? null : reset
 
     this.host = null
 
@@ -172,7 +168,7 @@ class Request {
     }
 
     if (util.isFormDataLike(this.body)) {
-      if (nodeMajor < 16 || (nodeMajor === 16 && nodeMinor < 8)) {
+      if (util.nodeMajor < 16 || (util.nodeMajor === 16 && util.nodeMinor < 8)) {
         throw new InvalidArgumentError('Form-Data bodies are only supported in node v16.8 and newer.')
       }
 
@@ -279,11 +275,16 @@ class Request {
 }
 
 function processHeaderValue (key, val) {
-  if (val && (typeof val === 'object' && !Array.isArray(val))) {
+  if (val && typeof val === 'object') {
     throw new InvalidArgumentError(`invalid ${key} header`)
-  } else if (headerCharRegex.exec(val) !== null) {
+  }
+
+  val = val != null ? `${val}` : ''
+
+  if (headerCharRegex.exec(val) !== null) {
     throw new InvalidArgumentError(`invalid ${key} header`)
   }
+
   return `${key}: ${val}\r\n`
 }
 
@@ -299,6 +300,9 @@ function processHeader (request, key, val) {
     key.length === 4 &&
     key.toLowerCase() === 'host'
   ) {
+    if (headerCharRegex.exec(val) !== null) {
+      throw new InvalidArgumentError(`invalid ${key} header`)
+    }
     // Consumed by Client
     request.host = val
   } else if (
@@ -313,11 +317,10 @@ function processHeader (request, key, val) {
   } else if (
     request.contentType === null &&
     key.length === 12 &&
-    key.toLowerCase() === 'content-type' &&
-    headerCharRegex.exec(val) === null
+    key.toLowerCase() === 'content-type'
   ) {
     request.contentType = val
-    request.headers += `${key}: ${val}\r\n`
+    request.headers += processHeaderValue(key, val)
   } else if (
     key.length === 17 &&
     key.toLowerCase() === 'transfer-encoding'
@@ -327,7 +330,7 @@ function processHeader (request, key, val) {
     key.length === 10 &&
     key.toLowerCase() === 'connection'
   ) {
-    const value = val.toLowerCase()
+    const value = typeof val === 'string' ? val.toLowerCase() : null
     if (value !== 'close' && value !== 'keep-alive') {
       throw new InvalidArgumentError('invalid connection header')
     } else if (value === 'close') {
diff --git a/lib/core/symbols.js b/lib/core/symbols.js
index 6d6b62919e6..ae96d4efa97 100644
--- a/lib/core/symbols.js
+++ b/lib/core/symbols.js
@@ -41,7 +41,7 @@ module.exports = {
   kClient: Symbol('client'),
   kParser: Symbol('parser'),
   kOnDestroyed: Symbol('destroy callbacks'),
-  kPipelining: Symbol('pipelinig'),
+  kPipelining: Symbol('pipelining'),
   kSocket: Symbol('socket'),
   kHostHeader: Symbol('host header'),
   kConnector: Symbol('connector'),
@@ -51,5 +51,7 @@ module.exports = {
   kProxy: Symbol('proxy agent options'),
   kCounter: Symbol('socket request counter'),
   kInterceptors: Symbol('dispatch interceptors'),
-  kMaxResponseSize: Symbol('max response size')
+  kMaxResponseSize: Symbol('max response size'),
+  kHost: Symbol('host'),
+  kHTTP2Session: Symbol('http2Session')
 }
diff --git a/lib/core/util.js b/lib/core/util.js
index c2dcf79fb80..6f247d22a52 100644
--- a/lib/core/util.js
+++ b/lib/core/util.js
@@ -10,10 +10,12 @@ const { Blob } = require('buffer')
 const nodeUtil = require('util')
 const { stringify } = require('querystring')
 
+const [nodeMajor, nodeMinor] = process.versions.node.split('.').map(v => Number(v))
+
 function nop () {}
 
 function isStream (obj) {
-  return obj && typeof obj.pipe === 'function'
+  return obj && typeof obj === 'object' && typeof obj.pipe === 'function' && typeof obj.on === 'function'
 }
 
 // based on https://github.com/node-fetch/fetch-blob/blob/8ab587d34080de94140b54f07168451e7d0b655e/index.js#L229-L241 (MIT License)
@@ -44,34 +46,40 @@ function buildURL (url, queryParams) {
 function parseURL (url) {
   if (typeof url === 'string') {
     url = new URL(url)
+
+    if (!/^https?:/.test(url.origin || url.protocol)) {
+      throw new InvalidArgumentError('Invalid URL protocol: the URL must start with `http:` or `https:`.')
+    }
+
+    return url
   }
 
   if (!url || typeof url !== 'object') {
-    throw new InvalidArgumentError('invalid url')
+    throw new InvalidArgumentError('Invalid URL: The URL argument must be a non-null object.')
   }
 
   if (url.port != null && url.port !== '' && !Number.isFinite(parseInt(url.port))) {
-    throw new InvalidArgumentError('invalid port')
+    throw new InvalidArgumentError('Invalid URL: port must be a valid integer or a string representation of an integer.')
   }
 
   if (url.path != null && typeof url.path !== 'string') {
-    throw new InvalidArgumentError('invalid path')
+    throw new InvalidArgumentError('Invalid URL path: the path must be a string or null/undefined.')
   }
 
   if (url.pathname != null && typeof url.pathname !== 'string') {
-    throw new InvalidArgumentError('invalid pathname')
+    throw new InvalidArgumentError('Invalid URL pathname: the pathname must be a string or null/undefined.')
   }
 
   if (url.hostname != null && typeof url.hostname !== 'string') {
-    throw new InvalidArgumentError('invalid hostname')
+    throw new InvalidArgumentError('Invalid URL hostname: the hostname must be a string or null/undefined.')
   }
 
   if (url.origin != null && typeof url.origin !== 'string') {
-    throw new InvalidArgumentError('invalid origin')
+    throw new InvalidArgumentError('Invalid URL origin: the origin must be a string or null/undefined.')
   }
 
   if (!/^https?:/.test(url.origin || url.protocol)) {
-    throw new InvalidArgumentError('invalid protocol')
+    throw new InvalidArgumentError('Invalid URL protocol: the URL must start with `http:` or `https:`.')
   }
 
   if (!(url instanceof URL)) {
@@ -213,25 +221,55 @@ function parseHeaders (headers, obj = {}) {
   for (let i = 0; i < headers.length; i += 2) {
     const key = headers[i].toString().toLowerCase()
     let val = obj[key]
+
     if (!val) {
       if (Array.isArray(headers[i + 1])) {
         obj[key] = headers[i + 1]
       } else {
-        obj[key] = headers[i + 1].toString()
+        obj[key] = headers[i + 1].toString('utf8')
       }
     } else {
       if (!Array.isArray(val)) {
         val = [val]
         obj[key] = val
       }
-      val.push(headers[i + 1].toString())
+      val.push(headers[i + 1].toString('utf8'))
     }
   }
+
+  // See https://github.com/nodejs/node/pull/46528
+  if ('content-length' in obj && 'content-disposition' in obj) {
+    obj['content-disposition'] = Buffer.from(obj['content-disposition']).toString('latin1')
+  }
+
   return obj
 }
 
 function parseRawHeaders (headers) {
-  return headers.map(header => header.toString())
+  const ret = []
+  let hasContentLength = false
+  let contentDispositionIdx = -1
+
+  for (let n = 0; n < headers.length; n += 2) {
+    const key = headers[n + 0].toString()
+    const val = headers[n + 1].toString('utf8')
+
+    if (key.length === 14 && (key === 'content-length' || key.toLowerCase() === 'content-length')) {
+      ret.push(key, val)
+      hasContentLength = true
+    } else if (key.length === 19 && (key === 'content-disposition' || key.toLowerCase() === 'content-disposition')) {
+      contentDispositionIdx = ret.push(key, val) - 1
+    } else {
+      ret.push(key, val)
+    }
+  }
+
+  // See https://github.com/nodejs/node/pull/46528
+  if (hasContentLength && contentDispositionIdx !== -1) {
+    ret[contentDispositionIdx] = Buffer.from(ret[contentDispositionIdx]).toString('latin1')
+  }
+
+  return ret
 }
 
 function isBuffer (buffer) {
@@ -354,8 +392,49 @@ function ReadableStreamFrom (iterable) {
   )
 }
 
-function isFormDataLike (chunk) {
-  return chunk && chunk.constructor && chunk.constructor.name === 'FormData'
+// The chunk should be a FormData instance and contains
+// all the required methods.
+function isFormDataLike (object) {
+  return (
+    object &&
+    typeof object === 'object' &&
+    typeof object.append === 'function' &&
+    typeof object.delete === 'function' &&
+    typeof object.get === 'function' &&
+    typeof object.getAll === 'function' &&
+    typeof object.has === 'function' &&
+    typeof object.set === 'function' &&
+    object[Symbol.toStringTag] === 'FormData'
+  )
+}
+
+function throwIfAborted (signal) {
+  if (!signal) { return }
+  if (typeof signal.throwIfAborted === 'function') {
+    signal.throwIfAborted()
+  } else {
+    if (signal.aborted) {
+      // DOMException not available < v17.0.0
+      const err = new Error('The operation was aborted')
+      err.name = 'AbortError'
+      throw err
+    }
+  }
+}
+
+const hasToWellFormed = !!String.prototype.toWellFormed
+
+/**
+ * @param {string} val
+ */
+function toUSVString (val) {
+  if (hasToWellFormed) {
+    return `${val}`.toWellFormed()
+  } else if (nodeUtil.toUSVString) {
+    return nodeUtil.toUSVString(val)
+  }
+
+  return `${val}`
 }
 
 const kEnumerableProperty = Object.create(null)
@@ -367,7 +446,7 @@ module.exports = {
   isDisturbed,
   isErrored,
   isReadable,
-  toUSVString: nodeUtil.toUSVString || ((val) => `${val}`),
+  toUSVString,
   isReadableAborted,
   isBlobLike,
   parseOrigin,
@@ -388,5 +467,9 @@ module.exports = {
   validateHandler,
   getSocketInfo,
   isFormDataLike,
-  buildURL
+  buildURL,
+  throwIfAborted,
+  nodeMajor,
+  nodeMinor,
+  nodeHasAutoSelectFamily: nodeMajor > 18 || (nodeMajor === 18 && nodeMinor >= 13)
 }
diff --git a/lib/fetch/constants.js b/lib/fetch/constants.js
index bc90a031cde..a5294a994fb 100644
--- a/lib/fetch/constants.js
+++ b/lib/fetch/constants.js
@@ -48,11 +48,17 @@ const requestCache = [
   'only-if-cached'
 ]
 
+// https://fetch.spec.whatwg.org/#request-body-header-name
 const requestBodyHeader = [
   'content-encoding',
   'content-language',
   'content-location',
-  'content-type'
+  'content-type',
+  // See https://github.com/nodejs/undici/issues/2021
+  // 'Content-Length' is a forbidden header name, which is typically
+  // removed in the Headers implementation. However, undici doesn't
+  // filter out headers, so we add it here.
+  'content-length'
 ]
 
 // https://fetch.spec.whatwg.org/#enumdef-requestduplex
diff --git a/lib/fetch/dataURL.js b/lib/fetch/dataURL.js
index 74b6d9ec472..beefad15482 100644
--- a/lib/fetch/dataURL.js
+++ b/lib/fetch/dataURL.js
@@ -1,10 +1,15 @@
 const assert = require('assert')
 const { atob } = require('buffer')
-const { format } = require('url')
 const { isValidHTTPToken, isomorphicDecode } = require('./util')
 
 const encoder = new TextEncoder()
 
+// Regex
+const HTTP_TOKEN_CODEPOINTS = /^[!#$%&'*+-.^_|~A-z0-9]+$/
+const HTTP_WHITESPACE_REGEX = /(\u000A|\u000D|\u0009|\u0020)/ // eslint-disable-line
+// https://mimesniff.spec.whatwg.org/#http-quoted-string-token-code-point
+const HTTP_QUOTED_STRING_TOKENS = /^(\u0009|\x{0020}-\x{007E}|\x{0080}-\x{00FF})+$/ // eslint-disable-line
+
 // https://fetch.spec.whatwg.org/#data-url-processor
 /** @param {URL} dataURL */
 function dataURLProcessor (dataURL) {
@@ -25,8 +30,8 @@ function dataURLProcessor (dataURL) {
   // 5. Let mimeType be the result of collecting a
   // sequence of code points that are not equal
   // to U+002C (,), given position.
-  let mimeType = collectASequenceOfCodePoints(
-    (char) => char !== ',',
+  let mimeType = collectASequenceOfCodePointsFast(
+    ',',
     input,
     position
   )
@@ -112,7 +117,17 @@ function dataURLProcessor (dataURL) {
  * @param {boolean} excludeFragment
  */
 function URLSerializer (url, excludeFragment = false) {
-  return format(url, { fragment: !excludeFragment })
+  const href = url.href
+
+  if (!excludeFragment) {
+    return href
+  }
+
+  const hash = href.lastIndexOf('#')
+  if (hash === -1) {
+    return href
+  }
+  return href.slice(0, hash)
 }
 
 // https://infra.spec.whatwg.org/#collect-a-sequence-of-code-points
@@ -139,6 +154,25 @@ function collectASequenceOfCodePoints (condition, input, position) {
   return result
 }
 
+/**
+ * A faster collectASequenceOfCodePoints that only works when comparing a single character.
+ * @param {string} char
+ * @param {string} input
+ * @param {{ position: number }} position
+ */
+function collectASequenceOfCodePointsFast (char, input, position) {
+  const idx = input.indexOf(char, position.position)
+  const start = position.position
+
+  if (idx === -1) {
+    position.position = input.length
+    return input.slice(start)
+  }
+
+  position.position = idx
+  return input.slice(start, position.position)
+}
+
 // https://url.spec.whatwg.org/#string-percent-decode
 /** @param {string} input */
 function stringPercentDecode (input) {
@@ -208,8 +242,8 @@ function parseMIMEType (input) {
   // 3. Let type be the result of collecting a sequence
   // of code points that are not U+002F (/) from
   // input, given position.
-  const type = collectASequenceOfCodePoints(
-    (char) => char !== '/',
+  const type = collectASequenceOfCodePointsFast(
+    '/',
     input,
     position
   )
@@ -217,7 +251,7 @@ function parseMIMEType (input) {
   // 4. If type is the empty string or does not solely
   // contain HTTP token code points, then return failure.
   // https://mimesniff.spec.whatwg.org/#http-token-code-point
-  if (type.length === 0 || !/^[!#$%&'*+-.^_|~A-z0-9]+$/.test(type)) {
+  if (type.length === 0 || !HTTP_TOKEN_CODEPOINTS.test(type)) {
     return 'failure'
   }
 
@@ -233,8 +267,8 @@ function parseMIMEType (input) {
   // 7. Let subtype be the result of collecting a sequence of
   // code points that are not U+003B (;) from input, given
   // position.
-  let subtype = collectASequenceOfCodePoints(
-    (char) => char !== ';',
+  let subtype = collectASequenceOfCodePointsFast(
+    ';',
     input,
     position
   )
@@ -244,7 +278,7 @@ function parseMIMEType (input) {
 
   // 9. If subtype is the empty string or does not solely
   // contain HTTP token code points, then return failure.
-  if (subtype.length === 0 || !/^[!#$%&'*+-.^_|~A-z0-9]+$/.test(subtype)) {
+  if (subtype.length === 0 || !HTTP_TOKEN_CODEPOINTS.test(subtype)) {
     return 'failure'
   }
 
@@ -258,9 +292,7 @@ function parseMIMEType (input) {
     /** @type {Map<string, string>} */
     parameters: new Map(),
     // https://mimesniff.spec.whatwg.org/#mime-type-essence
-    get essence () {
-      return `${this.type}/${this.subtype}`
-    }
+    essence: `${type}/${subtype}`
   }
 
   // 11. While position is not past the end of input:
@@ -272,7 +304,7 @@ function parseMIMEType (input) {
     // whitespace from input given position.
     collectASequenceOfCodePoints(
       // https://fetch.spec.whatwg.org/#http-whitespace
-      (char) => /(\u000A|\u000D|\u0009|\u0020)/.test(char), // eslint-disable-line
+      char => HTTP_WHITESPACE_REGEX.test(char),
       input,
       position
     )
@@ -320,8 +352,8 @@ function parseMIMEType (input) {
 
       // 2. Collect a sequence of code points that are not
       // U+003B (;) from input, given position.
-      collectASequenceOfCodePoints(
-        (char) => char !== ';',
+      collectASequenceOfCodePointsFast(
+        ';',
         input,
         position
       )
@@ -331,8 +363,8 @@ function parseMIMEType (input) {
       // 1. Set parameterValue to the result of collecting
       // a sequence of code points that are not U+003B (;)
       // from input, given position.
-      parameterValue = collectASequenceOfCodePoints(
-        (char) => char !== ';',
+      parameterValue = collectASequenceOfCodePointsFast(
+        ';',
         input,
         position
       )
@@ -355,9 +387,8 @@ function parseMIMEType (input) {
     // then set mimeType’s parameters[parameterName] to parameterValue.
     if (
       parameterName.length !== 0 &&
-      /^[!#$%&'*+-.^_|~A-z0-9]+$/.test(parameterName) &&
-      // https://mimesniff.spec.whatwg.org/#http-quoted-string-token-code-point
-      !/^(\u0009|\x{0020}-\x{007E}|\x{0080}-\x{00FF})+$/.test(parameterValue) &&  // eslint-disable-line
+      HTTP_TOKEN_CODEPOINTS.test(parameterName) &&
+      !HTTP_QUOTED_STRING_TOKENS.test(parameterValue) &&
       !mimeType.parameters.has(parameterName)
     ) {
       mimeType.parameters.set(parameterName, parameterValue)
@@ -534,6 +565,7 @@ module.exports = {
   dataURLProcessor,
   URLSerializer,
   collectASequenceOfCodePoints,
+  collectASequenceOfCodePointsFast,
   stringPercentDecode,
   parseMIMEType,
   collectAnHTTPQuotedString,
diff --git a/lib/fetch/formdata.js b/lib/fetch/formdata.js
index a0c9e2f9373..5975e26c1a0 100644
--- a/lib/fetch/formdata.js
+++ b/lib/fetch/formdata.js
@@ -61,14 +61,7 @@ class FormData {
 
     // The delete(name) method steps are to remove all entries whose name
     // is name from this’s entry list.
-    const next = []
-    for (const entry of this[kState]) {
-      if (entry.name !== name) {
-        next.push(entry)
-      }
-    }
-
-    this[kState] = next
+    this[kState] = this[kState].filter(entry => entry.name !== name)
   }
 
   get (name) {
@@ -259,7 +252,7 @@ function makeEntry (name, value, filename) {
         lastModified: value.lastModified
       }
 
-      value = value instanceof File
+      value = (NativeFile && value instanceof NativeFile) || value instanceof UndiciFile
         ? new File([value], filename, options)
         : new FileLike(value, filename, options)
     }
diff --git a/lib/fetch/headers.js b/lib/fetch/headers.js
index f3955f2a47a..b42a5edeaab 100644
--- a/lib/fetch/headers.js
+++ b/lib/fetch/headers.js
@@ -11,6 +11,7 @@ const {
   isValidHeaderValue
 } = require('./util')
 const { webidl } = require('./webidl')
+const assert = require('assert')
 
 const kHeadersMap = Symbol('headers map')
 const kHeadersSortedMap = Symbol('headers map sorted')
@@ -23,10 +24,12 @@ function headerValueNormalize (potentialValue) {
   //  To normalize a byte sequence potentialValue, remove
   //  any leading and trailing HTTP whitespace bytes from
   //  potentialValue.
-  return potentialValue.replace(
-    /^[\r\n\t ]+|[\r\n\t ]+$/g,
-    ''
-  )
+
+  // Trimming the end with `.replace()` and a RegExp is typically subject to
+  // ReDoS. This is safer and faster.
+  let i = potentialValue.length
+  while (/[\r\n\t ]/.test(potentialValue.charAt(--i)));
+  return potentialValue.slice(0, i + 1).replace(/^[\r\n\t ]+/, '')
 }
 
 function fill (headers, object) {
@@ -72,6 +75,7 @@ class HeadersList {
     if (init instanceof HeadersList) {
       this[kHeadersMap] = new Map(init[kHeadersMap])
       this[kHeadersSortedMap] = init[kHeadersSortedMap]
+      this.cookies = init.cookies
     } else {
       this[kHeadersMap] = new Map(init)
       this[kHeadersSortedMap] = null
@@ -91,6 +95,7 @@ class HeadersList {
   clear () {
     this[kHeadersMap].clear()
     this[kHeadersSortedMap] = null
+    this.cookies = null
   }
 
   // https://fetch.spec.whatwg.org/#concept-header-list-append
@@ -104,14 +109,18 @@ class HeadersList {
 
     // 2. Append (name, value) to list.
     if (exists) {
-      this[kHeadersMap].set(lowercaseName, { name: exists.name, value: `${exists.value}, ${value}` })
+      const delimiter = lowercaseName === 'cookie' ? '; ' : ', '
+      this[kHeadersMap].set(lowercaseName, {
+        name: exists.name,
+        value: `${exists.value}${delimiter}${value}`
+      })
     } else {
       this[kHeadersMap].set(lowercaseName, { name, value })
     }
 
     if (lowercaseName === 'set-cookie') {
       this.cookies ??= []
-      this.cookies.push([name, value])
+      this.cookies.push(value)
     }
   }
 
@@ -121,7 +130,7 @@ class HeadersList {
     const lowercaseName = name.toLowerCase()
 
     if (lowercaseName === 'set-cookie') {
-      this.cookies = [[name, value]]
+      this.cookies = [value]
     }
 
     // 1. If list contains name, then set the value of
@@ -379,18 +388,74 @@ class Headers {
     return this[kHeadersList].set(name, value)
   }
 
+  // https://fetch.spec.whatwg.org/#dom-headers-getsetcookie
+  getSetCookie () {
+    webidl.brandCheck(this, Headers)
+
+    // 1. If this’s header list does not contain `Set-Cookie`, then return « ».
+    // 2. Return the values of all headers in this’s header list whose name is
+    //    a byte-case-insensitive match for `Set-Cookie`, in order.
+
+    const list = this[kHeadersList].cookies
+
+    if (list) {
+      return [...list]
+    }
+
+    return []
+  }
+
+  // https://fetch.spec.whatwg.org/#concept-header-list-sort-and-combine
   get [kHeadersSortedMap] () {
-    if (!this[kHeadersList][kHeadersSortedMap]) {
-      this[kHeadersList][kHeadersSortedMap] = new Map([...this[kHeadersList]].sort((a, b) => a[0] < b[0] ? -1 : 1))
+    if (this[kHeadersList][kHeadersSortedMap]) {
+      return this[kHeadersList][kHeadersSortedMap]
     }
-    return this[kHeadersList][kHeadersSortedMap]
+
+    // 1. Let headers be an empty list of headers with the key being the name
+    //    and value the value.
+    const headers = []
+
+    // 2. Let names be the result of convert header names to a sorted-lowercase
+    //    set with all the names of the headers in list.
+    const names = [...this[kHeadersList]].sort((a, b) => a[0] < b[0] ? -1 : 1)
+    const cookies = this[kHeadersList].cookies
+
+    // 3. For each name of names:
+    for (const [name, value] of names) {
+      // 1. If name is `set-cookie`, then:
+      if (name === 'set-cookie') {
+        // 1. Let values be a list of all values of headers in list whose name
+        //    is a byte-case-insensitive match for name, in order.
+
+        // 2. For each value of values:
+        // 1. Append (name, value) to headers.
+        for (const value of cookies) {
+          headers.push([name, value])
+        }
+      } else {
+        // 2. Otherwise:
+
+        // 1. Let value be the result of getting name from list.
+
+        // 2. Assert: value is non-null.
+        assert(value !== null)
+
+        // 3. Append (name, value) to headers.
+        headers.push([name, value])
+      }
+    }
+
+    this[kHeadersList][kHeadersSortedMap] = headers
+
+    // 4. Return headers.
+    return headers
   }
 
   keys () {
     webidl.brandCheck(this, Headers)
 
     return makeIterator(
-      () => [...this[kHeadersSortedMap].entries()],
+      () => [...this[kHeadersSortedMap].values()],
       'Headers',
       'key'
     )
@@ -400,7 +465,7 @@ class Headers {
     webidl.brandCheck(this, Headers)
 
     return makeIterator(
-      () => [...this[kHeadersSortedMap].entries()],
+      () => [...this[kHeadersSortedMap].values()],
       'Headers',
       'value'
     )
@@ -410,7 +475,7 @@ class Headers {
     webidl.brandCheck(this, Headers)
 
     return makeIterator(
-      () => [...this[kHeadersSortedMap].entries()],
+      () => [...this[kHeadersSortedMap].values()],
       'Headers',
       'key+value'
     )
diff --git a/lib/fetch/index.js b/lib/fetch/index.js
index ddcf3c18f91..0b2e3394322 100644
--- a/lib/fetch/index.js
+++ b/lib/fetch/index.js
@@ -37,7 +37,10 @@ const {
   isErrorLike,
   fullyReadBody,
   readableStreamClose,
-  isomorphicEncode
+  isomorphicEncode,
+  urlIsLocal,
+  urlIsHttpHttpsScheme,
+  urlHasHttpsScheme
 } = require('./util')
 const { kState, kHeaders, kGuard, kRealm, kHeadersCaseInsensitive } = require('./symbols')
 const assert = require('assert')
@@ -53,10 +56,10 @@ const {
 const { kHeadersList } = require('../core/symbols')
 const EE = require('events')
 const { Readable, pipeline } = require('stream')
-const { isErrored, isReadable } = require('../core/util')
+const { isErrored, isReadable, nodeMajor, nodeMinor } = require('../core/util')
 const { dataURLProcessor, serializeAMimeType } = require('./dataURL')
 const { TransformStream } = require('stream/web')
-const { getGlobalDispatcher } = require('../../index')
+const { getGlobalDispatcher } = require('../global')
 const { webidl } = require('./webidl')
 const { STATUS_CODES } = require('http')
 
@@ -64,10 +67,6 @@ const { STATUS_CODES } = require('http')
 let resolveObjectURL
 let ReadableStream = globalThis.ReadableStream
 
-const nodeVersion = process.versions.node.split('.')
-const nodeMajor = Number(nodeVersion[0])
-const nodeMinor = Number(nodeVersion[1])
-
 class Fetch extends EE {
   constructor (dispatcher) {
     super()
@@ -276,7 +275,7 @@ function finalizeAndReportTiming (response, initiatorType = 'other') {
   let cacheState = response.cacheState
 
   // 6. If originalURL’s scheme is not an HTTP(S) scheme, then return.
-  if (!/^https?:/.test(originalURL.protocol)) {
+  if (!urlIsHttpHttpsScheme(originalURL)) {
     return
   }
 
@@ -301,7 +300,7 @@ function finalizeAndReportTiming (response, initiatorType = 'other') {
   // capability.
   // TODO: given global’s relevant settings object’s cross-origin isolated
   // capability?
-  response.timingInfo.endTime = coarsenedSharedCurrentTime()
+  timingInfo.endTime = coarsenedSharedCurrentTime()
 
   // 10. Set response’s timing info to timingInfo.
   response.timingInfo = timingInfo
@@ -534,10 +533,7 @@ async function mainFetch (fetchParams, recursive = false) {
 
   // 3. If request’s local-URLs-only flag is set and request’s current URL is
   // not local, then set response to a network error.
-  if (
-    request.localURLsOnly &&
-    !/^(about|blob|data):/.test(requestCurrentURL(request).protocol)
-  ) {
+  if (request.localURLsOnly && !urlIsLocal(requestCurrentURL(request))) {
     response = makeNetworkError('local URLs only')
   }
 
@@ -627,7 +623,7 @@ async function mainFetch (fetchParams, recursive = false) {
       }
 
       // request’s current URL’s scheme is not an HTTP(S) scheme
-      if (!/^https?:/.test(requestCurrentURL(request).protocol)) {
+      if (!urlIsHttpHttpsScheme(requestCurrentURL(request))) {
         // Return a network error.
         return makeNetworkError('URL scheme must be a HTTP(S) scheme')
       }
@@ -1134,7 +1130,7 @@ async function httpRedirectFetch (fetchParams, response) {
 
   // 6. If locationURL’s scheme is not an HTTP(S) scheme, then return a network
   // error.
-  if (!/^https?:/.test(locationURL.protocol)) {
+  if (!urlIsHttpHttpsScheme(locationURL)) {
     return makeNetworkError('URL scheme must be a HTTP(S) scheme')
   }
 
@@ -1209,7 +1205,7 @@ async function httpRedirectFetch (fetchParams, response) {
   // 14. If request’s body is non-null, then set request’s body to the first return
   // value of safely extracting request’s body’s source.
   if (request.body != null) {
-    assert(request.body.source)
+    assert(request.body.source != null)
     request.body = safelyExtractBody(request.body.source)[0]
   }
 
@@ -1403,7 +1399,7 @@ async function httpNetworkOrCacheFetch (
   //    header if httpRequest’s header list contains that header’s name.
   //    TODO: https://github.com/whatwg/fetch/issues/1285#issuecomment-896560129
   if (!httpRequest.headersList.contains('accept-encoding')) {
-    if (/^https:/.test(requestCurrentURL(httpRequest).protocol)) {
+    if (urlHasHttpsScheme(requestCurrentURL(httpRequest))) {
       httpRequest.headersList.append('accept-encoding', 'br, gzip, deflate')
     } else {
       httpRequest.headersList.append('accept-encoding', 'gzip, deflate')
@@ -1849,6 +1845,7 @@ async function httpNetworkFetch (
       // 4. Set bytes to the result of handling content codings given
       // codings and bytes.
       let bytes
+      let isFailure
       try {
         const { done, value } = await fetchParams.controller.next()
 
@@ -1863,6 +1860,10 @@ async function httpNetworkFetch (
           bytes = undefined
         } else {
           bytes = err
+
+          // err may be propagated from the result of calling readablestream.cancel,
+          // which might not be an error. https://github.com/nodejs/undici/issues/2009
+          isFailure = true
         }
       }
 
@@ -1882,7 +1883,7 @@ async function httpNetworkFetch (
       timingInfo.decodedBodySize += bytes?.byteLength ?? 0
 
       // 6. If bytes is failure, then terminate fetchParams’s controller.
-      if (isErrorLike(bytes)) {
+      if (isFailure) {
         fetchParams.controller.terminate(bytes)
         return
       }
@@ -1951,8 +1952,6 @@ async function httpNetworkFetch (
         body: fetchParams.controller.dispatcher.isMockActive ? request.body && request.body.source : body,
         headers: request.headersList[kHeadersCaseInsensitive],
         maxRedirections: 0,
-        bodyTimeout: 300_000,
-        headersTimeout: 300_000,
         upgrade: request.mode === 'websocket' ? 'websocket' : undefined
       },
       {
@@ -1985,7 +1984,9 @@ async function httpNetworkFetch (
             const val = headersList[n + 1].toString('latin1')
 
             if (key.toLowerCase() === 'content-encoding') {
-              codings = val.split(',').map((x) => x.trim())
+              // https://www.rfc-editor.org/rfc/rfc7231#section-3.1.2.1
+              // "All content-coding values are case-insensitive..."
+              codings = val.toLowerCase().split(',').map((x) => x.trim())
             } else if (key.toLowerCase() === 'location') {
               location = val
             }
@@ -2004,9 +2005,10 @@ async function httpNetworkFetch (
           // https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Encoding
           if (request.method !== 'HEAD' && request.method !== 'CONNECT' && !nullBodyStatus.includes(status) && !willFollow) {
             for (const coding of codings) {
-              if (/(x-)?gzip/.test(coding)) {
+              // https://www.rfc-editor.org/rfc/rfc9112.html#section-7.2
+              if (coding === 'x-gzip' || coding === 'gzip') {
                 decoders.push(zlib.createGunzip())
-              } else if (/(x-)?deflate/.test(coding)) {
+              } else if (coding === 'deflate') {
                 decoders.push(zlib.createInflate())
               } else if (coding === 'br') {
                 decoders.push(zlib.createBrotliDecompress())
diff --git a/lib/fetch/request.js b/lib/fetch/request.js
index 7264d152f87..32c84bf7e6b 100644
--- a/lib/fetch/request.js
+++ b/lib/fetch/request.js
@@ -9,7 +9,8 @@ const util = require('../core/util')
 const {
   isValidHTTPToken,
   sameOrigin,
-  normalizeMethod
+  normalizeMethod,
+  makePolicyContainer
 } = require('./util')
 const {
   forbiddenMethods,
@@ -28,10 +29,12 @@ const { getGlobalOrigin } = require('./global')
 const { URLSerializer } = require('./dataURL')
 const { kHeadersList } = require('../core/symbols')
 const assert = require('assert')
+const { setMaxListeners, getEventListeners, defaultMaxListeners } = require('events')
 
 let TransformStream = globalThis.TransformStream
 
 const kInit = Symbol('init')
+const kAbortController = Symbol('abortController')
 
 const requestFinalizer = new FinalizationRegistry(({ signal, abort }) => {
   signal.removeEventListener('abort', abort)
@@ -50,10 +53,14 @@ class Request {
     input = webidl.converters.RequestInfo(input)
     init = webidl.converters.RequestInit(init)
 
-    // TODO
+    // https://html.spec.whatwg.org/multipage/webappapis.html#environment-settings-object
     this[kRealm] = {
       settingsObject: {
-        baseUrl: getGlobalOrigin()
+        baseUrl: getGlobalOrigin(),
+        get origin () {
+          return this.baseUrl?.origin
+        },
+        policyContainer: makePolicyContainer()
       }
     }
 
@@ -122,12 +129,12 @@ class Request {
     }
 
     // 10. If init["window"] exists and is non-null, then throw a TypeError.
-    if (init.window !== undefined && init.window != null) {
+    if (init.window != null) {
       throw new TypeError(`'window' option '${window}' must be null`)
     }
 
     // 11. If init["window"] exists, then set window to "no-window".
-    if (init.window !== undefined) {
+    if ('window' in init) {
       window = 'no-window'
     }
 
@@ -348,12 +355,30 @@ class Request {
       if (signal.aborted) {
         ac.abort(signal.reason)
       } else {
+        // Keep a strong ref to ac while request object
+        // is alive. This is needed to prevent AbortController
+        // from being prematurely garbage collected.
+        // See, https://github.com/nodejs/undici/issues/1926.
+        this[kAbortController] = ac
+
         const acRef = new WeakRef(ac)
         const abort = function () {
-          acRef.deref()?.abort(this.reason)
+          const ac = acRef.deref()
+          if (ac !== undefined) {
+            ac.abort(this.reason)
+          }
         }
+
+        // Third-party AbortControllers may not work with these.
+        // See, https://github.com/nodejs/undici/pull/1910#issuecomment-1464495619.
+        try {
+          if (getEventListeners(signal, 'abort').length >= defaultMaxListeners) {
+            setMaxListeners(100, signal)
+          }
+        } catch {}
+
         signal.addEventListener('abort', abort, { once: true })
-        requestFinalizer.register(this, { signal, abort })
+        requestFinalizer.register(ac, { signal, abort })
       }
     }
 
@@ -413,7 +438,7 @@ class Request {
     // non-null, and request’s method is `GET` or `HEAD`, then throw a
     // TypeError.
     if (
-      ((init.body !== undefined && init.body != null) || inputBody != null) &&
+      (init.body != null || inputBody != null) &&
       (request.method === 'GET' || request.method === 'HEAD')
     ) {
       throw new TypeError('Request with GET/HEAD method cannot have body.')
@@ -423,7 +448,7 @@ class Request {
     let initBody = null
 
     // 36. If init["body"] exists and is non-null, then:
-    if (init.body !== undefined && init.body != null) {
+    if (init.body != null) {
       // 1. Let Content-Type be null.
       // 2. Set initBody and Content-Type to the result of extracting
       // init["body"], with keepalive set to request’s keepalive.
diff --git a/lib/fetch/response.js b/lib/fetch/response.js
index 09732114e7a..ff06bfb47d0 100644
--- a/lib/fetch/response.js
+++ b/lib/fetch/response.js
@@ -348,9 +348,7 @@ function makeNetworkError (reason) {
     status: 0,
     error: isError
       ? reason
-      : new Error(reason ? String(reason) : reason, {
-        cause: isError ? reason : undefined
-      }),
+      : new Error(reason ? String(reason) : reason),
     aborted: reason && reason.name === 'AbortError'
   })
 }
diff --git a/lib/fetch/util.js b/lib/fetch/util.js
index a0faed91354..23023262d14 100644
--- a/lib/fetch/util.js
+++ b/lib/fetch/util.js
@@ -1,6 +1,7 @@
 'use strict'
 
 const { redirectStatus, badPorts, referrerPolicy: referrerPolicyTokens } = require('./constants')
+const { getGlobalOrigin } = require('./global')
 const { performance } = require('perf_hooks')
 const { isBlobLike, toUSVString, ReadableStreamFrom } = require('../core/util')
 const assert = require('assert')
@@ -36,9 +37,11 @@ function responseLocationURL (response, requestFragment) {
   // `Location` and response’s header list.
   let location = response.headersList.get('location')
 
-  // 3. If location is a value, then set location to the result of parsing
-  // location with response’s URL.
-  location = location ? new URL(location, responseURL(response)) : null
+  // 3. If location is a header value, then set location to the result of
+  //    parsing location with response’s URL.
+  if (location !== null && isValidHeaderValue(location)) {
+    location = new URL(location, responseURL(response))
+  }
 
   // 4. If location is a URL whose fragment is null, then set location’s
   // fragment to requestFragment.
@@ -61,7 +64,7 @@ function requestBadPort (request) {
 
   // 2. If url’s scheme is an HTTP(S) scheme and url’s port is a bad port,
   // then return blocked.
-  if (/^https?:/.test(url.protocol) && badPorts.includes(url.port)) {
+  if (urlIsHttpHttpsScheme(url) && badPorts.includes(url.port)) {
     return 'blocked'
   }
 
@@ -267,7 +270,7 @@ function appendRequestOriginHeader (request) {
   // 2. If request’s response tainting is "cors" or request’s mode is "websocket", then append (`Origin`, serializedOrigin) to request’s header list.
   if (request.responseTainting === 'cors' || request.mode === 'websocket') {
     if (serializedOrigin) {
-      request.headersList.append('Origin', serializedOrigin)
+      request.headersList.append('origin', serializedOrigin)
     }
 
   // 3. Otherwise, if request’s method is neither `GET` nor `HEAD`, then:
@@ -282,7 +285,7 @@ function appendRequestOriginHeader (request) {
       case 'strict-origin':
       case 'strict-origin-when-cross-origin':
         // If request’s origin is a tuple origin, its scheme is "https", and request’s current URL’s scheme is not "https", then set serializedOrigin to `null`.
-        if (/^https:/.test(request.origin) && !/^https:/.test(requestCurrentURL(request))) {
+        if (request.origin && urlHasHttpsScheme(request.origin) && !urlHasHttpsScheme(requestCurrentURL(request))) {
           serializedOrigin = null
         }
         break
@@ -298,7 +301,7 @@ function appendRequestOriginHeader (request) {
 
     if (serializedOrigin) {
       // 2. Append (`Origin`, serializedOrigin) to request’s header list.
-      request.headersList.append('Origin', serializedOrigin)
+      request.headersList.append('origin', serializedOrigin)
     }
   }
 }
@@ -327,14 +330,17 @@ function createOpaqueTimingInfo (timingInfo) {
 
 // https://html.spec.whatwg.org/multipage/origin.html#policy-container
 function makePolicyContainer () {
-  // TODO
-  return {}
+  // Note: the fetch spec doesn't make use of embedder policy or CSP list
+  return {
+    referrerPolicy: 'strict-origin-when-cross-origin'
+  }
 }
 
 // https://html.spec.whatwg.org/multipage/origin.html#clone-a-policy-container
-function clonePolicyContainer () {
-  // TODO
-  return {}
+function clonePolicyContainer (policyContainer) {
+  return {
+    referrerPolicy: policyContainer.referrerPolicy
+  }
 }
 
 // https://w3c.github.io/webappsec-referrer-policy/#determine-requests-referrer
@@ -342,104 +348,76 @@ function determineRequestsReferrer (request) {
   // 1. Let policy be request's referrer policy.
   const policy = request.referrerPolicy
 
-  // Return no-referrer when empty or policy says so
-  if (policy == null || policy === '' || policy === 'no-referrer') {
-    return 'no-referrer'
-  }
+  // Note: policy cannot (shouldn't) be null or an empty string.
+  assert(policy)
+
+  // 2. Let environment be request’s client.
 
-  // 2. Let environment be the request client
-  const environment = request.client
   let referrerSource = null
 
-  /**
-   * 3, Switch on request’s referrer:
-    "client"
-      If environment’s global object is a Window object, then
-        Let document be the associated Document of environment’s global object.
-        If document’s origin is an opaque origin, return no referrer.
-        While document is an iframe srcdoc document,
-        let document be document’s browsing context’s browsing context container’s node document.
-        Let referrerSource be document’s URL.
-
-      Otherwise, let referrerSource be environment’s creation URL.
-
-    a URL
-    Let referrerSource be request’s referrer.
-   */
+  // 3. Switch on request’s referrer:
   if (request.referrer === 'client') {
-    // Not defined in Node but part of the spec
-    if (request.client?.globalObject?.constructor?.name === 'Window' ) { // eslint-disable-line
-      const origin = environment.globalObject.self?.origin ?? environment.globalObject.location?.origin
-
-      // If document’s origin is an opaque origin, return no referrer.
-      if (origin == null || origin === 'null') return 'no-referrer'
-
-      // Let referrerSource be document’s URL.
-      referrerSource = new URL(environment.globalObject.location.href)
-    } else {
-      // 3(a)(II) If environment's global object is not Window,
-      // Let referrerSource be environments creationURL
-      if (environment?.globalObject?.location == null) {
-        return 'no-referrer'
-      }
+    // Note: node isn't a browser and doesn't implement document/iframes,
+    // so we bypass this step and replace it with our own.
 
-      referrerSource = new URL(environment.globalObject.location.href)
+    const globalOrigin = getGlobalOrigin()
+
+    if (!globalOrigin || globalOrigin.origin === 'null') {
+      return 'no-referrer'
     }
+
+    // note: we need to clone it as it's mutated
+    referrerSource = new URL(globalOrigin)
   } else if (request.referrer instanceof URL) {
-    // 3(b) If requests's referrer is a URL instance, then make
-    // referrerSource be requests's referrer.
+    // Let referrerSource be request’s referrer.
     referrerSource = request.referrer
-  } else {
-    // If referrerSource neither client nor instance of URL
-    // then return "no-referrer".
-    return 'no-referrer'
   }
 
-  const urlProtocol = referrerSource.protocol
+  // 4. Let request’s referrerURL be the result of stripping referrerSource for
+  //    use as a referrer.
+  let referrerURL = stripURLForReferrer(referrerSource)
 
-  // If url's scheme is a local scheme (i.e. one of "about", "data", "javascript", "file")
-  // then return "no-referrer".
-  if (
-    urlProtocol === 'about:' || urlProtocol === 'data:' ||
-    urlProtocol === 'blob:'
-  ) {
-    return 'no-referrer'
+  // 5. Let referrerOrigin be the result of stripping referrerSource for use as
+  //    a referrer, with the origin-only flag set to true.
+  const referrerOrigin = stripURLForReferrer(referrerSource, true)
+
+  // 6. If the result of serializing referrerURL is a string whose length is
+  //    greater than 4096, set referrerURL to referrerOrigin.
+  if (referrerURL.toString().length > 4096) {
+    referrerURL = referrerOrigin
   }
 
-  let temp
-  let referrerOrigin
-  // 4. Let requests's referrerURL be the result of stripping referrer
-  // source for use as referrer (using util function, without origin only)
-  const referrerUrl = (temp = stripURLForReferrer(referrerSource)).length > 4096
-  // 5. Let referrerOrigin be the result of stripping referrer
-  // source for use as referrer (using util function, with originOnly true)
-    ? (referrerOrigin = stripURLForReferrer(referrerSource, true))
-  // 6. If result of seralizing referrerUrl is a string whose length is greater than
-  // 4096, then set referrerURL to referrerOrigin
-    : temp
-  const areSameOrigin = sameOrigin(request, referrerUrl)
-  const isNonPotentiallyTrustWorthy = isURLPotentiallyTrustworthy(referrerUrl) &&
+  const areSameOrigin = sameOrigin(request, referrerURL)
+  const isNonPotentiallyTrustWorthy = isURLPotentiallyTrustworthy(referrerURL) &&
     !isURLPotentiallyTrustworthy(request.url)
 
-  // NOTE: How to treat step 7?
   // 8. Execute the switch statements corresponding to the value of policy:
   switch (policy) {
     case 'origin': return referrerOrigin != null ? referrerOrigin : stripURLForReferrer(referrerSource, true)
-    case 'unsafe-url': return referrerUrl
+    case 'unsafe-url': return referrerURL
     case 'same-origin':
       return areSameOrigin ? referrerOrigin : 'no-referrer'
     case 'origin-when-cross-origin':
-      return areSameOrigin ? referrerUrl : referrerOrigin
-    case 'strict-origin-when-cross-origin':
-      /**
-         * 1. If the origin of referrerURL and the origin of request’s current URL are the same,
-         * then return referrerURL.
-         * 2. If referrerURL is a potentially trustworthy URL and request’s current URL is not a
-         * potentially trustworthy URL, then return no referrer.
-         * 3. Return referrerOrigin
-      */
-      if (areSameOrigin) return referrerOrigin
-      // else return isNonPotentiallyTrustWorthy ? 'no-referrer' : referrerOrigin
+      return areSameOrigin ? referrerURL : referrerOrigin
+    case 'strict-origin-when-cross-origin': {
+      const currentURL = requestCurrentURL(request)
+
+      // 1. If the origin of referrerURL and the origin of request’s current
+      //    URL are the same, then return referrerURL.
+      if (sameOrigin(referrerURL, currentURL)) {
+        return referrerURL
+      }
+
+      // 2. If referrerURL is a potentially trustworthy URL and request’s
+      //    current URL is not a potentially trustworthy URL, then return no
+      //    referrer.
+      if (isURLPotentiallyTrustworthy(referrerURL) && !isURLPotentiallyTrustworthy(currentURL)) {
+        return 'no-referrer'
+      }
+
+      // 3. Return referrerOrigin.
+      return referrerOrigin
+    }
     case 'strict-origin': // eslint-disable-line
       /**
          * 1. If referrerURL is a potentially trustworthy URL and
@@ -458,15 +436,42 @@ function determineRequestsReferrer (request) {
     default: // eslint-disable-line
       return isNonPotentiallyTrustWorthy ? 'no-referrer' : referrerOrigin
   }
+}
+
+/**
+ * @see https://w3c.github.io/webappsec-referrer-policy/#strip-url
+ * @param {URL} url
+ * @param {boolean|undefined} originOnly
+ */
+function stripURLForReferrer (url, originOnly) {
+  // 1. Assert: url is a URL.
+  assert(url instanceof URL)
+
+  // 2. If url’s scheme is a local scheme, then return no referrer.
+  if (url.protocol === 'file:' || url.protocol === 'about:' || url.protocol === 'blank:') {
+    return 'no-referrer'
+  }
+
+  // 3. Set url’s username to the empty string.
+  url.username = ''
+
+  // 4. Set url’s password to the empty string.
+  url.password = ''
+
+  // 5. Set url’s fragment to null.
+  url.hash = ''
 
-  function stripURLForReferrer (url, originOnly = false) {
-    const urlObject = new URL(url.href)
-    urlObject.username = ''
-    urlObject.password = ''
-    urlObject.hash = ''
+  // 6. If the origin-only flag is true, then:
+  if (originOnly) {
+    // 1. Set url’s path to « the empty string ».
+    url.pathname = ''
 
-    return originOnly ? urlObject.origin : urlObject.href
+    // 2. Set url’s query to null.
+    url.search = ''
   }
+
+  // 7. Return url.
+  return url
 }
 
 function isURLPotentiallyTrustworthy (url) {
@@ -633,7 +638,9 @@ function tryUpgradeRequestToAPotentiallyTrustworthyURL (request) {
  */
 function sameOrigin (A, B) {
   // 1. If A and B are the same opaque origin, then return true.
-  // "opaque origin" is an internal value we cannot access, ignore.
+  if (A.origin === B.origin && A.origin === 'null') {
+    return true
+  }
 
   // 2. If A and B are both tuple origins and their schemes,
   //    hosts, and port are identical, then return true.
@@ -939,6 +946,41 @@ async function readAllBytes (reader, successSteps, failureSteps) {
   }
 }
 
+/**
+ * @see https://fetch.spec.whatwg.org/#is-local
+ * @param {URL} url
+ */
+function urlIsLocal (url) {
+  assert('protocol' in url) // ensure it's a url object
+
+  const protocol = url.protocol
+
+  return protocol === 'about:' || protocol === 'blob:' || protocol === 'data:'
+}
+
+/**
+ * @param {string|URL} url
+ */
+function urlHasHttpsScheme (url) {
+  if (typeof url === 'string') {
+    return url.startsWith('https:')
+  }
+
+  return url.protocol === 'https:'
+}
+
+/**
+ * @see https://fetch.spec.whatwg.org/#http-scheme
+ * @param {URL} url
+ */
+function urlIsHttpHttpsScheme (url) {
+  assert('protocol' in url) // ensure it's a url object
+
+  const protocol = url.protocol
+
+  return protocol === 'http:' || protocol === 'https:'
+}
+
 /**
  * Fetch supports node >= 16.8.0, but Object.hasOwn was added in v16.9.0.
  */
@@ -983,5 +1025,8 @@ module.exports = {
   isReadableStreamLike,
   readableStreamClose,
   isomorphicEncode,
-  isomorphicDecode
+  isomorphicDecode,
+  urlIsLocal,
+  urlHasHttpsScheme,
+  urlIsHttpHttpsScheme
 }
diff --git a/lib/fileapi/encoding.js b/lib/fileapi/encoding.js
index 4aac20cce13..1d1d2b6544f 100644
--- a/lib/fileapi/encoding.js
+++ b/lib/fileapi/encoding.js
@@ -2,9 +2,13 @@
 
 /**
  * @see https://encoding.spec.whatwg.org/#concept-encoding-get
- * @param {string} label
+ * @param {string|undefined} label
  */
 function getEncoding (label) {
+  if (!label) {
+    return 'failure'
+  }
+
   // 1. Remove any leading and trailing ASCII whitespace from label.
   // 2. If label is an ASCII case-insensitive match for any of the
   //    labels listed in the table below, then return the
diff --git a/lib/mock/mock-utils.js b/lib/mock/mock-utils.js
index 9dc414d0a35..42ea185cc0e 100644
--- a/lib/mock/mock-utils.js
+++ b/lib/mock/mock-utils.js
@@ -188,7 +188,11 @@ function buildKey (opts) {
 }
 
 function generateKeyValues (data) {
-  return Object.entries(data).reduce((keyValuePairs, [key, value]) => [...keyValuePairs, key, value], [])
+  return Object.entries(data).reduce((keyValuePairs, [key, value]) => [
+    ...keyValuePairs,
+    Buffer.from(`${key}`),
+    Array.isArray(value) ? value.map(x => Buffer.from(`${x}`)) : Buffer.from(`${value}`)
+  ], [])
 }
 
 /**
diff --git a/lib/pool.js b/lib/pool.js
index c1c20dd6b87..93b3158f21a 100644
--- a/lib/pool.js
+++ b/lib/pool.js
@@ -32,6 +32,8 @@ class Pool extends PoolBase {
     tls,
     maxCachedSessions,
     socketPath,
+    autoSelectFamily,
+    autoSelectFamilyAttemptTimeout,
     ...options
   } = {}) {
     super()
@@ -54,6 +56,7 @@ class Pool extends PoolBase {
         maxCachedSessions,
         socketPath,
         timeout: connectTimeout == null ? 10e3 : connectTimeout,
+        ...(util.nodeHasAutoSelectFamily && autoSelectFamily ? { autoSelectFamily, autoSelectFamilyAttemptTimeout } : undefined),
         ...connect
       })
     }
diff --git a/lib/proxy-agent.js b/lib/proxy-agent.js
index c2e7f268b70..c710948cc5b 100644
--- a/lib/proxy-agent.js
+++ b/lib/proxy-agent.js
@@ -3,7 +3,7 @@
 const { kProxy, kClose, kDestroy, kInterceptors } = require('./core/symbols')
 const { URL } = require('url')
 const Agent = require('./agent')
-const Client = require('./client')
+const Pool = require('./pool')
 const DispatcherBase = require('./dispatcher-base')
 const { InvalidArgumentError, RequestAbortedError } = require('./core/errors')
 const buildConnector = require('./core/connect')
@@ -34,6 +34,10 @@ function buildProxyOptions (opts) {
   }
 }
 
+function defaultFactory (origin, opts) {
+  return new Pool(origin, opts)
+}
+
 class ProxyAgent extends DispatcherBase {
   constructor (opts) {
     super(opts)
@@ -51,9 +55,15 @@ class ProxyAgent extends DispatcherBase {
       throw new InvalidArgumentError('Proxy opts.uri is mandatory')
     }
 
+    const { clientFactory = defaultFactory } = opts
+
+    if (typeof clientFactory !== 'function') {
+      throw new InvalidArgumentError('Proxy opts.clientFactory must be a function.')
+    }
+
     this[kRequestTls] = opts.requestTls
     this[kProxyTls] = opts.proxyTls
-    this[kProxyHeaders] = {}
+    this[kProxyHeaders] = opts.headers || {}
 
     if (opts.auth && opts.token) {
       throw new InvalidArgumentError('opts.auth cannot be used in combination with opts.token')
@@ -69,7 +79,7 @@ class ProxyAgent extends DispatcherBase {
 
     const connect = buildConnector({ ...opts.proxyTls })
     this[kConnectEndpoint] = buildConnector({ ...opts.requestTls })
-    this[kClient] = new Client(resolvedUrl, { connect })
+    this[kClient] = clientFactory(resolvedUrl, { connect })
     this[kAgent] = new Agent({
       ...opts,
       connect: async (opts, callback) => {
diff --git a/lib/timers.js b/lib/timers.js
new file mode 100644
index 00000000000..5782217a0e0
--- /dev/null
+++ b/lib/timers.js
@@ -0,0 +1,97 @@
+'use strict'
+
+let fastNow = Date.now()
+let fastNowTimeout
+
+const fastTimers = []
+
+function onTimeout () {
+  fastNow = Date.now()
+
+  let len = fastTimers.length
+  let idx = 0
+  while (idx < len) {
+    const timer = fastTimers[idx]
+
+    if (timer.state === 0) {
+      timer.state = fastNow + timer.delay
+    } else if (timer.state > 0 && fastNow >= timer.state) {
+      timer.state = -1
+      timer.callback(timer.opaque)
+    }
+
+    if (timer.state === -1) {
+      timer.state = -2
+      if (idx !== len - 1) {
+        fastTimers[idx] = fastTimers.pop()
+      } else {
+        fastTimers.pop()
+      }
+      len -= 1
+    } else {
+      idx += 1
+    }
+  }
+
+  if (fastTimers.length > 0) {
+    refreshTimeout()
+  }
+}
+
+function refreshTimeout () {
+  if (fastNowTimeout && fastNowTimeout.refresh) {
+    fastNowTimeout.refresh()
+  } else {
+    clearTimeout(fastNowTimeout)
+    fastNowTimeout = setTimeout(onTimeout, 1e3)
+    if (fastNowTimeout.unref) {
+      fastNowTimeout.unref()
+    }
+  }
+}
+
+class Timeout {
+  constructor (callback, delay, opaque) {
+    this.callback = callback
+    this.delay = delay
+    this.opaque = opaque
+
+    //  -2 not in timer list
+    //  -1 in timer list but inactive
+    //   0 in timer list waiting for time
+    // > 0 in timer list waiting for time to expire
+    this.state = -2
+
+    this.refresh()
+  }
+
+  refresh () {
+    if (this.state === -2) {
+      fastTimers.push(this)
+      if (!fastNowTimeout || fastTimers.length === 1) {
+        refreshTimeout()
+      }
+    }
+
+    this.state = 0
+  }
+
+  clear () {
+    this.state = -1
+  }
+}
+
+module.exports = {
+  setTimeout (callback, delay, opaque) {
+    return delay < 1e3
+      ? setTimeout(callback, delay, opaque)
+      : new Timeout(callback, delay, opaque)
+  },
+  clearTimeout (timeout) {
+    if (timeout instanceof Timeout) {
+      timeout.clear()
+    } else {
+      clearTimeout(timeout)
+    }
+  }
+}
diff --git a/lib/websocket/connection.js b/lib/websocket/connection.js
index 43ecc1445f8..09770247e3f 100644
--- a/lib/websocket/connection.js
+++ b/lib/websocket/connection.js
@@ -1,24 +1,19 @@
 'use strict'
 
-// TODO: crypto isn't available in all environments
 const { randomBytes, createHash } = require('crypto')
 const diagnosticsChannel = require('diagnostics_channel')
 const { uid, states } = require('./constants')
 const {
   kReadyState,
-  kResponse,
-  kExtensions,
-  kProtocol,
   kSentClose,
   kByteParser,
   kReceivedClose
 } = require('./symbols')
 const { fireEvent, failWebsocketConnection } = require('./util')
 const { CloseEvent } = require('./events')
-const { ByteParser } = require('./receiver')
 const { makeRequest } = require('../fetch/request')
 const { fetching } = require('../fetch/index')
-const { getGlobalDispatcher } = require('../..')
+const { getGlobalDispatcher } = require('../global')
 
 const channels = {}
 channels.open = diagnosticsChannel.channel('undici:websocket:open')
@@ -30,8 +25,9 @@ channels.socketError = diagnosticsChannel.channel('undici:websocket:socket_error
  * @param {URL} url
  * @param {string|string[]} protocols
  * @param {import('./websocket').WebSocket} ws
+ * @param {(response: any) => void} onEstablish
  */
-function establishWebSocketConnection (url, protocols, ws) {
+function establishWebSocketConnection (url, protocols, ws, onEstablish) {
   // 1. Let requestURL be a copy of url, with its scheme set to "http", if url’s
   //    scheme is "ws", and to "https" otherwise.
   const requestURL = url
@@ -174,67 +170,25 @@ function establishWebSocketConnection (url, protocols, ws) {
         return
       }
 
-      // processResponse is called when the "response’s header list has been received and initialized."
-      // once this happens, the connection is open
-      ws[kResponse] = response
-
-      const parser = new ByteParser(ws)
-      response.socket.ws = ws // TODO: use symbol
-      ws[kByteParser] = parser
-
-      whenConnectionEstablished(ws)
-
       response.socket.on('data', onSocketData)
       response.socket.on('close', onSocketClose)
       response.socket.on('error', onSocketError)
 
-      parser.on('drain', onParserDrain)
+      if (channels.open.hasSubscribers) {
+        channels.open.publish({
+          address: response.socket.address(),
+          protocol: secProtocol,
+          extensions: secExtension
+        })
+      }
+
+      onEstablish(response)
     }
   })
 
   return controller
 }
 
-/**
- * @see https://websockets.spec.whatwg.org/#feedback-from-the-protocol
- * @param {import('./websocket').WebSocket} ws
- */
-function whenConnectionEstablished (ws) {
-  const { [kResponse]: response } = ws
-
-  // 1. Change the ready state to OPEN (1).
-  ws[kReadyState] = states.OPEN
-
-  // 2. Change the extensions attribute’s value to the extensions in use, if
-  //    it is not the null value.
-  // https://datatracker.ietf.org/doc/html/rfc6455#section-9.1
-  const extensions = response.headersList.get('sec-websocket-extensions')
-
-  if (extensions !== null) {
-    ws[kExtensions] = extensions
-  }
-
-  // 3. Change the protocol attribute’s value to the subprotocol in use, if
-  //    it is not the null value.
-  // https://datatracker.ietf.org/doc/html/rfc6455#section-1.9
-  const protocol = response.headersList.get('sec-websocket-protocol')
-
-  if (protocol !== null) {
-    ws[kProtocol] = protocol
-  }
-
-  // 4. Fire an event named open at the WebSocket object.
-  fireEvent('open', ws)
-
-  if (channels.open.hasSubscribers) {
-    channels.open.publish({
-      address: response.socket.address(),
-      protocol,
-      extensions
-    })
-  }
-}
-
 /**
  * @param {Buffer} chunk
  */
@@ -244,10 +198,6 @@ function onSocketData (chunk) {
   }
 }
 
-function onParserDrain () {
-  this.ws[kResponse].socket.resume()
-}
-
 /**
  * @see https://websockets.spec.whatwg.org/#feedback-from-the-protocol
  * @see https://datatracker.ietf.org/doc/html/rfc6455#section-7.1.4
diff --git a/lib/websocket/symbols.js b/lib/websocket/symbols.js
index 5e135862f81..11d03e38a86 100644
--- a/lib/websocket/symbols.js
+++ b/lib/websocket/symbols.js
@@ -5,10 +5,7 @@ module.exports = {
   kReadyState: Symbol('ready state'),
   kController: Symbol('controller'),
   kResponse: Symbol('response'),
-  kExtensions: Symbol('extensions'),
-  kProtocol: Symbol('protocol'),
   kBinaryType: Symbol('binary type'),
-  kClosingFrame: Symbol('closing frame'),
   kSentClose: Symbol('sent close'),
   kReceivedClose: Symbol('received close'),
   kByteParser: Symbol('byte parser')
diff --git a/lib/websocket/websocket.js b/lib/websocket/websocket.js
index 366b6aa3e27..164d24c6f8a 100644
--- a/lib/websocket/websocket.js
+++ b/lib/websocket/websocket.js
@@ -8,15 +8,15 @@ const {
   kWebSocketURL,
   kReadyState,
   kController,
-  kExtensions,
-  kProtocol,
   kBinaryType,
   kResponse,
-  kSentClose
+  kSentClose,
+  kByteParser
 } = require('./symbols')
-const { isEstablished, isClosing, isValidSubprotocol, failWebsocketConnection } = require('./util')
+const { isEstablished, isClosing, isValidSubprotocol, failWebsocketConnection, fireEvent } = require('./util')
 const { establishWebSocketConnection } = require('./connection')
 const { WebsocketFrameSend } = require('./frame')
+const { ByteParser } = require('./receiver')
 const { kEnumerableProperty, isBlobLike } = require('../core/util')
 const { types } = require('util')
 
@@ -32,6 +32,8 @@ class WebSocket extends EventTarget {
   }
 
   #bufferedAmount = 0
+  #protocol = ''
+  #extensions = ''
 
   /**
    * @param {string} url
@@ -104,7 +106,12 @@ class WebSocket extends EventTarget {
 
     //    1. Establish a WebSocket connection given urlRecord, protocols,
     //       and client.
-    this[kController] = establishWebSocketConnection(urlRecord, protocols, this)
+    this[kController] = establishWebSocketConnection(
+      urlRecord,
+      protocols,
+      this,
+      (response) => this.#onConnectionEstablished(response)
+    )
 
     // Each WebSocket object has an associated ready state, which is a
     // number representing the state of the connection. Initially it must
@@ -112,10 +119,8 @@ class WebSocket extends EventTarget {
     this[kReadyState] = WebSocket.CONNECTING
 
     // The extensions attribute must initially return the empty string.
-    this[kExtensions] = ''
 
     // The protocol attribute must initially return the empty string.
-    this[kProtocol] = ''
 
     // Each WebSocket object has an associated binary type, which is a
     // BinaryType. Initially it must be "blob".
@@ -309,23 +314,14 @@ class WebSocket extends EventTarget {
       // not throw an exception must increase the bufferedAmount attribute
       // by the length of data’s buffer in bytes.
 
-      const ab = new ArrayBuffer(data.byteLength)
+      const ab = Buffer.from(data, data.byteOffset, data.byteLength)
 
-      if (Buffer.isBuffer(data)) {
-        // new Buffer signature is deprecated
-        Buffer.from(ab).set(data)
-      } else {
-        new data.constructor(ab).set(data)
-      }
-
-      const value = Buffer.from(ab)
-
-      const frame = new WebsocketFrameSend(value)
+      const frame = new WebsocketFrameSend(ab)
       const buffer = frame.createFrame(opcodes.BINARY)
 
-      this.#bufferedAmount += value.byteLength
+      this.#bufferedAmount += ab.byteLength
       socket.write(buffer, () => {
-        this.#bufferedAmount -= value.byteLength
+        this.#bufferedAmount -= ab.byteLength
       })
     } else if (isBlobLike(data)) {
       // If the WebSocket connection is established, and the WebSocket
@@ -377,13 +373,13 @@ class WebSocket extends EventTarget {
   get extensions () {
     webidl.brandCheck(this, WebSocket)
 
-    return this[kExtensions]
+    return this.#extensions
   }
 
   get protocol () {
     webidl.brandCheck(this, WebSocket)
 
-    return this[kProtocol]
+    return this.#protocol
   }
 
   get onopen () {
@@ -485,6 +481,47 @@ class WebSocket extends EventTarget {
       this[kBinaryType] = type
     }
   }
+
+  /**
+   * @see https://websockets.spec.whatwg.org/#feedback-from-the-protocol
+   */
+  #onConnectionEstablished (response) {
+    // processResponse is called when the "response’s header list has been received and initialized."
+    // once this happens, the connection is open
+    this[kResponse] = response
+
+    const parser = new ByteParser(this)
+    parser.on('drain', function onParserDrain () {
+      this.ws[kResponse].socket.resume()
+    })
+
+    response.socket.ws = this
+    this[kByteParser] = parser
+
+    // 1. Change the ready state to OPEN (1).
+    this[kReadyState] = states.OPEN
+
+    // 2. Change the extensions attribute’s value to the extensions in use, if
+    //    it is not the null value.
+    // https://datatracker.ietf.org/doc/html/rfc6455#section-9.1
+    const extensions = response.headersList.get('sec-websocket-extensions')
+
+    if (extensions !== null) {
+      this.#extensions = extensions
+    }
+
+    // 3. Change the protocol attribute’s value to the subprotocol in use, if
+    //    it is not the null value.
+    // https://datatracker.ietf.org/doc/html/rfc6455#section-1.9
+    const protocol = response.headersList.get('sec-websocket-protocol')
+
+    if (protocol !== null) {
+      this.#protocol = protocol
+    }
+
+    // 4. Fire an event named open at the WebSocket object.
+    fireEvent('open', this)
+  }
 }
 
 // https://websockets.spec.whatwg.org/#dom-websocket-connecting
diff --git a/package.json b/package.json
index a53b5d04399..912b86a5234 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "undici",
-  "version": "5.14.0",
+  "version": "5.21.2",
   "description": "An HTTP/1.1 client, written from scratch for Node.js",
   "homepage": "https://undici.nodejs.org",
   "bugs": {
@@ -46,16 +46,16 @@
     "build:wasm": "node build/wasm.js --docker",
     "lint": "standard | snazzy",
     "lint:fix": "standard --fix | snazzy",
-    "test": "npm run test:tap && npm run test:node-fetch && npm run test:fetch && npm run test:cookies && npm run test:wpt && npm run test:websocket && npm run test:jest && tsd",
+    "test": "npm run test:tap && npm run test:node-fetch && npm run test:fetch && npm run test:cookies && npm run test:wpt && npm run test:websocket && npm run test:jest && npm run test:typescript",
     "test:cookies": "node scripts/verifyVersion 16 || tap test/cookie/*.js",
     "test:node-fetch": "node scripts/verifyVersion.js 16 || mocha test/node-fetch",
-    "test:fetch": "node scripts/verifyVersion.js 16 || (npm run build:node && tap test/fetch/*.js && tap test/webidl/*.js)",
+    "test:fetch": "node scripts/verifyVersion.js 16 || (npm run build:node && tap --expose-gc test/fetch/*.js && tap test/webidl/*.js)",
     "test:jest": "node scripts/verifyVersion.js 14 || jest",
     "test:tap": "tap test/*.js test/diagnostics-channel/*.js",
     "test:tdd": "tap test/*.js test/diagnostics-channel/*.js -w",
-    "test:typescript": "tsd && tsc test/imports/undici-import.ts",
+    "test:typescript": "node scripts/verifyVersion.js 14 || tsd && tsc --skipLibCheck test/imports/undici-import.ts",
     "test:websocket": "node scripts/verifyVersion.js 18 || tap test/websocket/*.js",
-    "test:wpt": "node scripts/verifyVersion 18 || (node test/wpt/start-fetch.mjs && node test/wpt/start-FileAPI.mjs && node test/wpt/start-mimesniff.mjs && node test/wpt/start-xhr.mjs && node test/wpt/start-websockets.mjs)",
+    "test:wpt": "node scripts/verifyVersion 18 || (node test/wpt/start-fetch.mjs && node test/wpt/start-FileAPI.mjs && node test/wpt/start-mimesniff.mjs && node test/wpt/start-xhr.mjs && node --no-warnings test/wpt/start-websockets.mjs)",
     "coverage": "nyc --reporter=text --reporter=html npm run test",
     "coverage:ci": "nyc --reporter=lcov npm run test",
     "bench": "PORT=3042 concurrently -k -s first npm:bench:server npm:bench:run",
@@ -75,30 +75,32 @@
     "chai-as-promised": "^7.1.1",
     "chai-iterator": "^3.0.2",
     "chai-string": "^1.5.0",
-    "concurrently": "^7.1.0",
+    "concurrently": "^8.0.1",
     "cronometro": "^1.0.5",
     "delay": "^5.0.0",
+    "dns-packet": "^5.4.0",
     "docsify-cli": "^4.4.3",
+    "form-data": "^4.0.0",
     "formdata-node": "^4.3.1",
     "https-pem": "^3.0.0",
     "husky": "^8.0.1",
     "import-fresh": "^3.3.0",
     "jest": "^29.0.2",
+    "jsdom": "^21.1.0",
     "jsfuzz": "^1.0.15",
     "mocha": "^10.0.0",
     "p-timeout": "^3.2.0",
     "pre-commit": "^1.2.2",
     "proxy": "^1.0.2",
     "proxyquire": "^2.1.3",
-    "semver": "^7.3.5",
     "sinon": "^15.0.0",
     "snazzy": "^9.0.0",
     "standard": "^17.0.0",
     "table": "^6.8.0",
     "tap": "^16.1.0",
-    "tsd": "^0.25.0",
-    "typescript": "^4.8.4",
-    "wait-on": "^6.0.0",
+    "tsd": "^0.28.1",
+    "typescript": "^5.0.2",
+    "wait-on": "^7.0.1",
     "ws": "^8.11.0"
   },
   "engines": {
@@ -111,8 +113,7 @@
     "ignore": [
       "lib/llhttp/constants.js",
       "lib/llhttp/utils.js",
-      "test/wpt/tests",
-      "test/wpt/runner/resources"
+      "test/wpt/tests"
     ]
   },
   "tsd": {
diff --git a/test/async_hooks.js b/test/async_hooks.js
index 8a77af35d72..2e8533d2d9b 100644
--- a/test/async_hooks.js
+++ b/test/async_hooks.js
@@ -157,7 +157,7 @@ test('async hooks client is destroyed', (t) => {
     const client = new Client(`http://localhost:${server.address().port}`)
     t.teardown(client.destroy.bind(client))
 
-    client.request({ path: '/', method: 'GET' }, (err, { body }) => {
+    client.request({ path: '/', method: 'GET', throwOnError: true }, (err, { body }) => {
       t.error(err)
       body.resume()
       body.on('error', (err) => {
diff --git a/test/autoselectfamily.js b/test/autoselectfamily.js
new file mode 100644
index 00000000000..03f15545cf3
--- /dev/null
+++ b/test/autoselectfamily.js
@@ -0,0 +1,187 @@
+'use strict'
+
+const { test } = require('tap')
+const dgram = require('dgram')
+const { Resolver } = require('dns')
+const dnsPacket = require('dns-packet')
+const { createServer } = require('http')
+const { Client, Agent, request } = require('..')
+const { nodeHasAutoSelectFamily } = require('../lib/core/util')
+
+function _lookup (resolver, hostname, options, cb) {
+  resolver.resolve(hostname, 'ANY', (err, replies) => {
+    if (err) {
+      return cb(err)
+    }
+
+    const hosts = replies
+      .map((r) => ({ address: r.address, family: r.type === 'AAAA' ? 6 : 4 }))
+      .sort((a, b) => b.family - a.family)
+
+    if (options.all === true) {
+      return cb(null, hosts)
+    }
+
+    return cb(null, hosts[0].address, hosts[0].family)
+  })
+}
+
+function createDnsServer (ipv6Addr, ipv4Addr, cb) {
+  // Create a DNS server which replies with a AAAA and a A record for the same host
+  const socket = dgram.createSocket('udp4')
+
+  socket.on('message', (msg, { address, port }) => {
+    const parsed = dnsPacket.decode(msg)
+
+    const response = dnsPacket.encode({
+      type: 'answer',
+      id: parsed.id,
+      questions: parsed.questions,
+      answers: [
+        { type: 'AAAA', class: 'IN', name: 'example.org', data: '::1', ttl: 123 },
+        { type: 'A', class: 'IN', name: 'example.org', data: '127.0.0.1', ttl: 123 }
+      ]
+    })
+
+    socket.send(response, port, address)
+  })
+
+  socket.bind(0, () => {
+    const resolver = new Resolver()
+    resolver.setServers([`127.0.0.1:${socket.address().port}`])
+
+    cb(null, { dnsServer: socket, lookup: _lookup.bind(null, resolver) })
+  })
+}
+
+if (nodeHasAutoSelectFamily) {
+  test('with autoSelectFamily enable the request succeeds when using request', (t) => {
+    t.plan(3)
+
+    createDnsServer('::1', '127.0.0.1', function (_, { dnsServer, lookup }) {
+      const server = createServer((req, res) => {
+        res.end('hello')
+      })
+
+      t.teardown(() => {
+        server.close()
+        dnsServer.close()
+      })
+
+      server.listen(0, '127.0.0.1', () => {
+        const agent = new Agent({ connect: { lookup }, autoSelectFamily: true })
+
+        request(
+          `http://example.org:${server.address().port}/`, {
+            method: 'GET',
+            dispatcher: agent
+          }, (err, { statusCode, body }) => {
+            t.error(err)
+
+            let response = Buffer.alloc(0)
+
+            body.on('data', chunk => {
+              response = Buffer.concat([response, chunk])
+            })
+
+            body.on('end', () => {
+              t.strictSame(statusCode, 200)
+              t.strictSame(response.toString('utf-8'), 'hello')
+            })
+          })
+      })
+    })
+  })
+
+  test('with autoSelectFamily enable the request succeeds when using a client', (t) => {
+    t.plan(3)
+
+    createDnsServer('::1', '127.0.0.1', function (_, { dnsServer, lookup }) {
+      const server = createServer((req, res) => {
+        res.end('hello')
+      })
+
+      t.teardown(() => {
+        server.close()
+        dnsServer.close()
+      })
+
+      server.listen(0, '127.0.0.1', () => {
+        const client = new Client(`http://example.org:${server.address().port}`, { connect: { lookup }, autoSelectFamily: true })
+
+        t.teardown(client.destroy.bind(client))
+
+        client.request({
+          path: '/',
+          method: 'GET'
+        }, (err, { statusCode, body }) => {
+          t.error(err)
+
+          let response = Buffer.alloc(0)
+
+          body.on('data', chunk => {
+            response = Buffer.concat([response, chunk])
+          })
+
+          body.on('end', () => {
+            t.strictSame(statusCode, 200)
+            t.strictSame(response.toString('utf-8'), 'hello')
+          })
+        })
+      })
+    })
+  })
+}
+
+test('with autoSelectFamily disabled the request fails when using request', (t) => {
+  t.plan(1)
+
+  createDnsServer('::1', '127.0.0.1', function (_, { dnsServer, lookup }) {
+    const server = createServer((req, res) => {
+      res.end('hello')
+    })
+
+    t.teardown(() => {
+      server.close()
+      dnsServer.close()
+    })
+
+    server.listen(0, '127.0.0.1', () => {
+      const agent = new Agent({ connect: { lookup } })
+
+      request(`http://example.org:${server.address().port}`, {
+        method: 'GET',
+        dispatcher: agent
+      }, (err, { statusCode, body }) => {
+        t.strictSame(err.code, 'ECONNREFUSED')
+      })
+    })
+  })
+})
+
+test('with autoSelectFamily disabled the request fails when using a client', (t) => {
+  t.plan(1)
+
+  createDnsServer('::1', '127.0.0.1', function (_, { dnsServer, lookup }) {
+    const server = createServer((req, res) => {
+      res.end('hello')
+    })
+
+    t.teardown(() => {
+      server.close()
+      dnsServer.close()
+    })
+
+    server.listen(0, '127.0.0.1', () => {
+      const client = new Client(`http://example.org:${server.address().port}`, { connect: { lookup } })
+      t.teardown(client.destroy.bind(client))
+
+      client.request({
+        path: '/',
+        method: 'GET'
+      }, (err, { statusCode, body }) => {
+        t.strictSame(err.code, 'ECONNREFUSED')
+      })
+    })
+  })
+})
diff --git a/test/balanced-pool.js b/test/balanced-pool.js
index 7e28da7c72d..669e04a571c 100644
--- a/test/balanced-pool.js
+++ b/test/balanced-pool.js
@@ -2,6 +2,7 @@
 
 const { test } = require('tap')
 const { BalancedPool, Pool, Client, errors } = require('..')
+const { nodeMajor } = require('../lib/core/util')
 const { createServer } = require('http')
 const { promisify } = require('util')
 
@@ -433,7 +434,10 @@ const cases = [
     expected: ['A', 'B', 'C', 'A', 'B', 'C/connectionRefused', 'A', 'B', 'A', 'B', 'A', 'B', 'C', 'A', 'B', 'C'],
     expectedConnectionRefusedErrors: 1,
     expectedSocketErrors: 0,
-    expectedRatios: [0.34, 0.34, 0.32]
+    expectedRatios: [0.34, 0.34, 0.32],
+
+    // Skip because the behavior of Node.js has changed
+    skip: nodeMajor >= 19
   },
 
   // 8
@@ -476,8 +480,8 @@ const cases = [
 
 ]
 
-for (const [index, { config, expected, expectedRatios, iterations = 9, expectedConnectionRefusedErrors = 0, expectedSocketErrors = 0, maxWeightPerServer, errorPenalty = 10 }] of cases.entries()) {
-  test(`weighted round robin - case ${index}`, async (t) => {
+for (const [index, { config, expected, expectedRatios, iterations = 9, expectedConnectionRefusedErrors = 0, expectedSocketErrors = 0, maxWeightPerServer, errorPenalty = 10, only = false, skip = false }] of cases.entries()) {
+  test(`weighted round robin - case ${index}`, { only, skip }, async (t) => {
     // cerate an array to store succesfull reqeusts
     const requestLog = []
 
@@ -512,7 +516,6 @@ for (const [index, { config, expected, expectedRatios, iterations = 9, expectedC
         await client.request({ path: '/', method: 'GET' })
       } catch (e) {
         const serverWithError = servers.find(server => server.port === e.port) || servers.find(server => server.port === e.socket.remotePort)
-
         serverWithError.requestsCount++
 
         if (e.code === 'ECONNREFUSED') {
diff --git a/test/client-dispatch.js b/test/client-dispatch.js
index 9e59fdb2fb5..2196e5d53f5 100644
--- a/test/client-dispatch.js
+++ b/test/client-dispatch.js
@@ -94,7 +94,7 @@ test('basic dispatch get', (t) => {
     t.equal(`localhost:${server.address().port}`, req.headers.host)
     t.equal(undefined, req.headers.foo)
     t.equal('bar', req.headers.bar)
-    t.equal('null', req.headers.baz)
+    t.equal('', req.headers.baz)
     t.equal(undefined, req.headers['content-length'])
     res.end('hello')
   })
diff --git a/test/client-errors.js b/test/client-errors.js
index f96d7ecbb9f..936841fbb15 100644
--- a/test/client-errors.js
+++ b/test/client-errors.js
@@ -260,7 +260,7 @@ test('invalid options throws', (t) => {
     t.fail()
   } catch (err) {
     t.type(err, errors.InvalidArgumentError)
-    t.equal(err.message, 'invalid port')
+    t.equal(err.message, 'Invalid URL: port must be a valid integer or a string representation of an integer.')
   }
 
   try {
@@ -364,7 +364,7 @@ test('invalid options throws', (t) => {
     t.fail()
   } catch (err) {
     t.type(err, errors.InvalidArgumentError)
-    t.equal(err.message, 'invalid protocol')
+    t.equal(err.message, 'Invalid URL protocol: the URL must start with `http:` or `https:`.')
   }
 
   try {
@@ -374,7 +374,7 @@ test('invalid options throws', (t) => {
     t.fail()
   } catch (err) {
     t.type(err, errors.InvalidArgumentError)
-    t.equal(err.message, 'invalid hostname')
+    t.equal(err.message, 'Invalid URL hostname: the hostname must be a string or null/undefined.')
   }
 
   try {
@@ -392,7 +392,7 @@ test('invalid options throws', (t) => {
     t.fail()
   } catch (err) {
     t.type(err, errors.InvalidArgumentError)
-    t.equal(err.message, 'invalid url')
+    t.equal(err.message, 'Invalid URL: The URL argument must be a non-null object.')
   }
 
   try {
@@ -533,6 +533,14 @@ test('invalid options throws', (t) => {
     t.equal(err.message, 'maxRequestsPerClient must be a positive number')
   }
 
+  try {
+    new Client(new URL('http://localhost:200'), { autoSelectFamilyAttemptTimeout: 'foo' }) // eslint-disable-line
+    t.fail()
+  } catch (err) {
+    t.type(err, errors.InvalidArgumentError)
+    t.equal(err.message, 'autoSelectFamilyAttemptTimeout must be a positive number')
+  }
+
   t.end()
 })
 
diff --git a/test/client-head-reset-override.js b/test/client-head-reset-override.js
new file mode 100644
index 00000000000..a7d79e25d75
--- /dev/null
+++ b/test/client-head-reset-override.js
@@ -0,0 +1,62 @@
+'use strict'
+
+const { createServer } = require('http')
+const { test } = require('tap')
+const { Client } = require('..')
+
+test('override HEAD reset', (t) => {
+  const expected = 'testing123'
+  const server = createServer((req, res) => {
+    if (req.method === 'GET') {
+      res.write(expected)
+    }
+    res.end()
+  })
+  t.teardown(server.close.bind(server))
+
+  server.listen(0, () => {
+    const client = new Client(`http://localhost:${server.address().port}`)
+    t.teardown(client.close.bind(client))
+
+    let done
+    client.on('disconnect', () => {
+      if (!done) {
+        t.fail()
+      }
+    })
+
+    client.request({
+      path: '/',
+      method: 'HEAD',
+      reset: false
+    }, (err, res) => {
+      t.error(err)
+      res.body.resume()
+    })
+
+    client.request({
+      path: '/',
+      method: 'HEAD',
+      reset: false
+    }, (err, res) => {
+      t.error(err)
+      res.body.resume()
+    })
+
+    client.request({
+      path: '/',
+      method: 'GET',
+      reset: false
+    }, (err, res) => {
+      t.error(err)
+      let str = ''
+      res.body.on('data', (data) => {
+        str += data
+      }).on('end', () => {
+        t.same(str, expected)
+        done = true
+        t.end()
+      })
+    })
+  })
+})
diff --git a/test/client-keep-alive.js b/test/client-keep-alive.js
index b0f81606067..968bc50e89f 100644
--- a/test/client-keep-alive.js
+++ b/test/client-keep-alive.js
@@ -2,6 +2,7 @@
 
 const { test } = require('tap')
 const { Client } = require('..')
+const timers = require('../lib/timers')
 const { kConnect } = require('../lib/core/symbols')
 const { createServer } = require('net')
 const http = require('http')
@@ -31,7 +32,7 @@ test('keep-alive header', (t) => {
       body.on('end', () => {
         const timeout = setTimeout(() => {
           t.fail()
-        }, 2e3)
+        }, 4e3)
         client.on('disconnect', () => {
           t.pass()
           clearTimeout(timeout)
@@ -47,6 +48,12 @@ test('keep-alive header 0', (t) => {
   const clock = FakeTimers.install()
   t.teardown(clock.uninstall.bind(clock))
 
+  const orgTimers = { ...timers }
+  Object.assign(timers, { setTimeout, clearTimeout })
+  t.teardown(() => {
+    Object.assign(timers, orgTimers)
+  })
+
   const server = createServer((socket) => {
     socket.write('HTTP/1.1 200 OK\r\n')
     socket.write('Content-Length: 0\r\n')
@@ -135,7 +142,7 @@ test('keep-alive header no postfix', (t) => {
       body.on('end', () => {
         const timeout = setTimeout(() => {
           t.fail()
-        }, 2e3)
+        }, 3e3)
         client.on('disconnect', () => {
           t.pass()
           clearTimeout(timeout)
@@ -171,7 +178,7 @@ test('keep-alive not timeout', (t) => {
       body.on('end', () => {
         const timeout = setTimeout(() => {
           t.fail()
-        }, 2e3)
+        }, 3e3)
         client.on('disconnect', () => {
           t.pass()
           clearTimeout(timeout)
@@ -208,7 +215,7 @@ test('keep-alive threshold', (t) => {
       body.on('end', () => {
         const timeout = setTimeout(() => {
           t.fail()
-        }, 2e3)
+        }, 3e3)
         client.on('disconnect', () => {
           t.pass()
           clearTimeout(timeout)
@@ -245,7 +252,7 @@ test('keep-alive max keepalive', (t) => {
       body.on('end', () => {
         const timeout = setTimeout(() => {
           t.fail()
-        }, 2e3)
+        }, 3e3)
         client.on('disconnect', () => {
           t.pass()
           clearTimeout(timeout)
diff --git a/test/client-pipeline.js b/test/client-pipeline.js
index 5b03617edad..9b677a02774 100644
--- a/test/client-pipeline.js
+++ b/test/client-pipeline.js
@@ -11,6 +11,7 @@ const {
   Writable,
   PassThrough
 } = require('stream')
+const { nodeMajor } = require('../lib/core/util')
 
 test('pipeline get', (t) => {
   t.plan(17)
@@ -535,7 +536,7 @@ test('pipeline abort piped res', (t) => {
     })
       .on('error', (err) => {
         // Node < 13 doesn't always detect premature close.
-        if (process.versions.node.split('.')[0] < 13) {
+        if (nodeMajor < 13) {
           t.ok(err)
         } else {
           t.equal(err.code, 'UND_ERR_ABORTED')
diff --git a/test/client-reconnect.js b/test/client-reconnect.js
index 6abb8e403f3..ae1a206de63 100644
--- a/test/client-reconnect.js
+++ b/test/client-reconnect.js
@@ -4,6 +4,7 @@ const { test } = require('tap')
 const { Client } = require('..')
 const { createServer } = require('http')
 const FakeTimers = require('@sinonjs/fake-timers')
+const timers = require('../lib/timers')
 
 test('multiple reconnect', (t) => {
   t.plan(5)
@@ -12,6 +13,12 @@ test('multiple reconnect', (t) => {
   const clock = FakeTimers.install()
   t.teardown(clock.uninstall.bind(clock))
 
+  const orgTimers = { ...timers }
+  Object.assign(timers, { setTimeout, clearTimeout })
+  t.teardown(() => {
+    Object.assign(timers, orgTimers)
+  })
+
   const server = createServer((req, res) => {
     n === 0 ? res.destroy() : res.end('ok')
   })
diff --git a/test/client-request.js b/test/client-request.js
index 74976bb5925..2d73e9892ee 100644
--- a/test/client-request.js
+++ b/test/client-request.js
@@ -1,3 +1,5 @@
+/* globals AbortController */
+
 'use strict'
 
 const { test } = require('tap')
@@ -9,10 +11,9 @@ const { Readable } = require('stream')
 const net = require('net')
 const { promisify } = require('util')
 const { NotSupportedError } = require('../lib/core/errors')
+const { nodeMajor } = require('../lib/core/util')
 const { parseFormDataString } = require('./utils/formdata')
 
-const nodeMajor = Number(process.versions.node.split('.')[0])
-
 test('request dump', (t) => {
   t.plan(3)
 
@@ -42,6 +43,38 @@ test('request dump', (t) => {
   })
 })
 
+test('request dump with abort signal', (t) => {
+  t.plan(2)
+  const server = createServer((req, res) => {
+    res.write('hello')
+  })
+  t.teardown(server.close.bind(server))
+
+  server.listen(0, () => {
+    const client = new Client(`http://localhost:${server.address().port}`)
+    t.teardown(client.destroy.bind(client))
+
+    client.request({
+      path: '/',
+      method: 'GET'
+    }, (err, { body }) => {
+      t.error(err)
+      let ac
+      if (!global.AbortController) {
+        const { AbortController } = require('abort-controller')
+        ac = new AbortController()
+      } else {
+        ac = new AbortController()
+      }
+      body.dump({ signal: ac.signal }).catch((err) => {
+        t.equal(err.name, 'AbortError')
+        server.close()
+      })
+      ac.abort()
+    })
+  })
+})
+
 test('request abort before headers', (t) => {
   t.plan(6)
 
diff --git a/test/client-stream.js b/test/client-stream.js
index 2ff5fa53563..e67727b74c7 100644
--- a/test/client-stream.js
+++ b/test/client-stream.js
@@ -785,4 +785,63 @@ test('stream legacy needDrain', (t) => {
       t.pass()
     })
   })
+
+  test('steam throwOnError', (t) => {
+    t.plan(2)
+
+    const errStatusCode = 500
+    const errMessage = 'Internal Server Error'
+
+    const server = createServer((req, res) => {
+      res.writeHead(errStatusCode, { 'Content-Type': 'text/plain' })
+      res.end(errMessage)
+    })
+    t.teardown(server.close.bind(server))
+
+    server.listen(0, async () => {
+      const client = new Client(`http://localhost:${server.address().port}`)
+      t.teardown(client.close.bind(client))
+
+      client.stream({
+        path: '/',
+        method: 'GET',
+        throwOnError: true,
+        opaque: new PassThrough()
+      }, ({ opaque: pt }) => {
+        pt.on('data', () => {
+          t.fail()
+        })
+        return pt
+      }, (e) => {
+        t.equal(e.status, errStatusCode)
+        t.equal(e.body, errMessage)
+        t.end()
+      })
+    })
+  })
+
+  test('steam throwOnError=true, error on stream', (t) => {
+    t.plan(1)
+
+    const server = createServer((req, res) => {
+      res.end('asd')
+    })
+    t.teardown(server.close.bind(server))
+
+    server.listen(0, async () => {
+      const client = new Client(`http://localhost:${server.address().port}`)
+      t.teardown(client.close.bind(client))
+
+      client.stream({
+        path: '/',
+        method: 'GET',
+        throwOnError: true,
+        opaque: new PassThrough()
+      }, () => {
+        throw new Error('asd')
+      }, (e) => {
+        t.equal(e.message, 'asd')
+      })
+    })
+  })
 })
diff --git a/test/client-timeout.js b/test/client-timeout.js
index eedf1f48c97..5f1686a0251 100644
--- a/test/client-timeout.js
+++ b/test/client-timeout.js
@@ -5,6 +5,7 @@ const { Client, errors } = require('..')
 const { createServer } = require('http')
 const { Readable } = require('stream')
 const FakeTimers = require('@sinonjs/fake-timers')
+const timers = require('../lib/timers')
 
 test('refresh timeout on pause', (t) => {
   t.plan(1)
@@ -51,6 +52,12 @@ test('start headers timeout after request body', (t) => {
   const clock = FakeTimers.install()
   t.teardown(clock.uninstall.bind(clock))
 
+  const orgTimers = { ...timers }
+  Object.assign(timers, { setTimeout, clearTimeout })
+  t.teardown(() => {
+    Object.assign(timers, orgTimers)
+  })
+
   const server = createServer((req, res) => {
   })
   t.teardown(server.close.bind(server))
@@ -101,6 +108,12 @@ test('start headers timeout after async iterator request body', (t) => {
   const clock = FakeTimers.install()
   t.teardown(clock.uninstall.bind(clock))
 
+  const orgTimers = { ...timers }
+  Object.assign(timers, { setTimeout, clearTimeout })
+  t.teardown(() => {
+    Object.assign(timers, orgTimers)
+  })
+
   const server = createServer((req, res) => {
   })
   t.teardown(server.close.bind(server))
@@ -167,7 +180,7 @@ test('parser resume with no body timeout', (t) => {
       onConnect () {
       },
       onHeaders (statusCode, headers, resume) {
-        setTimeout(resume, 100)
+        setTimeout(resume, 2000)
         return false
       },
       onData () {
diff --git a/test/esm-wrapper.js b/test/esm-wrapper.js
index 997d7acbfb9..a593fbdb531 100644
--- a/test/esm-wrapper.js
+++ b/test/esm-wrapper.js
@@ -1,7 +1,7 @@
 'use strict'
-const semver = require('semver')
+const { nodeMajor, nodeMinor } = require('../lib/core/util')
 
-if (!semver.satisfies(process.version, '>= v14.13.0 || ^12.20.0')) {
+if (!((nodeMajor > 14 || (nodeMajor === 14 && nodeMajor > 13)) || (nodeMajor === 12 && nodeMinor > 20))) {
   require('tap') // shows skipped
 } else {
   ;(async () => {
diff --git a/test/fetch/407-statuscode-window-null.js b/test/fetch/407-statuscode-window-null.js
new file mode 100644
index 00000000000..e22554fac15
--- /dev/null
+++ b/test/fetch/407-statuscode-window-null.js
@@ -0,0 +1,20 @@
+'use strict'
+
+const { fetch } = require('../..')
+const { createServer } = require('http')
+const { once } = require('events')
+const { test } = require('tap')
+
+test('Receiving a 407 status code w/ a window option present should reject', async (t) => {
+  const server = createServer((req, res) => {
+    res.statusCode = 407
+    res.end()
+  }).listen(0)
+
+  t.teardown(server.close.bind(server))
+  await once(server, 'listening')
+
+  // if init.window exists, the spec tells us to set request.window to 'no-window',
+  // which later causes the request to be rejected if the status code is 407
+  await t.rejects(fetch(`http://localhost:${server.address().port}`, { window: null }))
+})
diff --git a/test/fetch/abort.js b/test/fetch/abort.js
index 3bb9efc8ba2..e1ca1ebf9ea 100644
--- a/test/fetch/abort.js
+++ b/test/fetch/abort.js
@@ -5,62 +5,10 @@ const { fetch } = require('../..')
 const { createServer } = require('http')
 const { once } = require('events')
 const { DOMException } = require('../../lib/fetch/constants')
+const { nodeMajor } = require('../../lib/core/util')
 
 const { AbortController: NPMAbortController } = require('abort-controller')
 
-/* global AbortController */
-
-test('parallel fetch with the same AbortController works as expected', async (t) => {
-  const body = {
-    fixes: 1389,
-    bug: 'Ensure request is not aborted before enqueueing bytes into stream.'
-  }
-
-  const server = createServer((req, res) => {
-    res.statusCode = 200
-    res.end(JSON.stringify(body))
-  })
-
-  t.teardown(server.close.bind(server))
-
-  const abortController = new AbortController()
-
-  async function makeRequest () {
-    const result = await fetch(`http://localhost:${server.address().port}`, {
-      signal: abortController.signal
-    }).then(response => response.json())
-
-    abortController.abort()
-    return result
-  }
-
-  server.listen(0)
-  await once(server, 'listening')
-
-  const requests = Array.from({ length: 10 }, makeRequest)
-  const result = await Promise.allSettled(requests)
-
-  // since the requests are running parallel, any of them could resolve first.
-  // therefore we cannot rely on the order of the requests sent.
-  const { resolved, rejected } = result.reduce((a, b) => {
-    if (b.status === 'rejected') {
-      a.rejected.push(b)
-    } else {
-      a.resolved.push(b)
-    }
-
-    return a
-  }, { resolved: [], rejected: [] })
-
-  t.equal(rejected.length, 9) // out of 10 requests, only 1 should succeed
-  t.equal(resolved.length, 1)
-
-  t.ok(rejected.every(rej => rej.reason?.code === DOMException.ABORT_ERR))
-  t.same(resolved[0].value, body)
-
-  t.end()
-})
-
 test('Allow the usage of custom implementation of AbortController', async (t) => {
   const body = {
     fixes: 1605
@@ -89,24 +37,32 @@ test('Allow the usage of custom implementation of AbortController', async (t) =>
   }
 })
 
-test('allows aborting with custom errors', { skip: process.version.startsWith('v16.') }, async (t) => {
-  const server = createServer((req, res) => {
-    setTimeout(() => res.end(), 5000)
-  }).listen(0)
+test('allows aborting with custom errors', { skip: nodeMajor === 16 }, async (t) => {
+  const server = createServer().listen(0)
 
   t.teardown(server.close.bind(server))
   await once(server, 'listening')
 
-  t.test('Using AbortSignal.timeout', async (t) => {
-    await t.rejects(
-      fetch(`http://localhost:${server.address().port}`, {
+  t.test('Using AbortSignal.timeout with cause', async (t) => {
+    t.plan(2)
+
+    try {
+      await fetch(`http://localhost:${server.address().port}`, {
         signal: AbortSignal.timeout(50)
-      }),
-      {
-        name: 'TimeoutError',
-        code: DOMException.TIMEOUT_ERR
+      })
+      t.fail('should throw')
+    } catch (err) {
+      if (err.name === 'TypeError') {
+        const cause = err.cause
+        t.equal(cause.name, 'HeadersTimeoutError')
+        t.equal(cause.code, 'UND_ERR_HEADERS_TIMEOUT')
+      } else if (err.name === 'TimeoutError') {
+        t.equal(err.code, DOMException.TIMEOUT_ERR)
+        t.equal(err.cause, undefined)
+      } else {
+        t.error(err)
       }
-    )
+    }
   })
 
   t.test('Error defaults to an AbortError DOMException', async (t) => {
diff --git a/test/fetch/abort2.js b/test/fetch/abort2.js
new file mode 100644
index 00000000000..5f3853bcb7a
--- /dev/null
+++ b/test/fetch/abort2.js
@@ -0,0 +1,60 @@
+'use strict'
+
+const { test } = require('tap')
+const { fetch } = require('../..')
+const { createServer } = require('http')
+const { once } = require('events')
+const { DOMException } = require('../../lib/fetch/constants')
+
+/* global AbortController */
+
+test('parallel fetch with the same AbortController works as expected', async (t) => {
+  const body = {
+    fixes: 1389,
+    bug: 'Ensure request is not aborted before enqueueing bytes into stream.'
+  }
+
+  const server = createServer((req, res) => {
+    res.statusCode = 200
+    res.end(JSON.stringify(body))
+  })
+
+  t.teardown(server.close.bind(server))
+
+  const abortController = new AbortController()
+
+  async function makeRequest () {
+    const result = await fetch(`http://localhost:${server.address().port}`, {
+      signal: abortController.signal
+    }).then(response => response.json())
+
+    abortController.abort()
+    return result
+  }
+
+  server.listen(0)
+  await once(server, 'listening')
+
+  const requests = Array.from({ length: 10 }, makeRequest)
+  const result = await Promise.allSettled(requests)
+
+  // since the requests are running parallel, any of them could resolve first.
+  // therefore we cannot rely on the order of the requests sent.
+  const { resolved, rejected } = result.reduce((a, b) => {
+    if (b.status === 'rejected') {
+      a.rejected.push(b)
+    } else {
+      a.resolved.push(b)
+    }
+
+    return a
+  }, { resolved: [], rejected: [] })
+
+  t.equal(rejected.length, 9) // out of 10 requests, only 1 should succeed
+  t.equal(resolved.length, 1)
+
+  t.ok(rejected.every(rej => rej.reason?.code === DOMException.ABORT_ERR))
+  t.same(resolved[0].value, body)
+
+  t.end()
+})
diff --git a/test/fetch/client-fetch.js b/test/fetch/client-fetch.js
index 7a0cb550f54..3ce058ee9ae 100644
--- a/test/fetch/client-fetch.js
+++ b/test/fetch/client-fetch.js
@@ -8,6 +8,7 @@ const { ReadableStream } = require('stream/web')
 const { Blob } = require('buffer')
 const { fetch, Response, Request, FormData, File } = require('../..')
 const { Client, setGlobalDispatcher, Agent } = require('../..')
+const { nodeMajor, nodeMinor } = require('../../lib/core/util')
 const nodeFetch = require('../../index-fetch')
 const { once } = require('events')
 const { gzipSync } = require('zlib')
@@ -199,7 +200,9 @@ test('multipart formdata not base64', async (t) => {
   t.equal(text, 'example\ntext file')
 })
 
-test('multipart formdata base64', (t) => {
+// TODO(@KhafraDev): re-enable this test once the issue is fixed
+// See https://github.com/nodejs/node/issues/47301
+test('multipart formdata base64', { skip: nodeMajor >= 19 && nodeMinor >= 8 }, (t) => {
   t.plan(1)
 
   // Example form data with base64 encoding
diff --git a/test/fetch/cookies.js b/test/fetch/cookies.js
index d17a8827df5..18b001d8644 100644
--- a/test/fetch/cookies.js
+++ b/test/fetch/cookies.js
@@ -48,3 +48,22 @@ test('Can send cookies to a server with fetch - issue #1463', async (t) => {
 
   t.end()
 })
+
+test('Cookie header is delimited with a semicolon rather than a comma - issue #1905', async (t) => {
+  t.plan(1)
+
+  const server = createServer((req, res) => {
+    t.equal(req.headers.cookie, 'FOO=lorem-ipsum-dolor-sit-amet; BAR=the-quick-brown-fox')
+    res.end()
+  }).listen(0)
+
+  t.teardown(server.close.bind(server))
+  await once(server, 'listening')
+
+  await fetch(`http://localhost:${server.address().port}`, {
+    headers: [
+      ['cookie', 'FOO=lorem-ipsum-dolor-sit-amet'],
+      ['cookie', 'BAR=the-quick-brown-fox']
+    ]
+  })
+})
diff --git a/test/fetch/data-uri.js b/test/fetch/data-uri.js
index 001eeb052bc..d4ca7ebab56 100644
--- a/test/fetch/data-uri.js
+++ b/test/fetch/data-uri.js
@@ -180,14 +180,14 @@ test('too long base64 url', async (t) => {
 
 test('https://domain.com/#', (t) => {
   t.plan(1)
-  const domain = 'https://domain.com/#'
+  const domain = 'https://domain.com/#a'
   const serialized = URLSerializer(new URL(domain))
   t.equal(serialized, domain)
 })
 
 test('https://domain.com/?', (t) => {
   t.plan(1)
-  const domain = 'https://domain.com/?'
+  const domain = 'https://domain.com/?a=b'
   const serialized = URLSerializer(new URL(domain))
   t.equal(serialized, domain)
 })
diff --git a/test/fetch/encoding.js b/test/fetch/encoding.js
new file mode 100644
index 00000000000..63d22f8b5e4
--- /dev/null
+++ b/test/fetch/encoding.js
@@ -0,0 +1,33 @@
+'use strict'
+
+const { test } = require('tap')
+const { createServer } = require('http')
+const { once } = require('events')
+const { fetch } = require('../..')
+const { createBrotliCompress, createGzip } = require('zlib')
+
+test('content-encoding header is case-iNsENsITIve', async (t) => {
+  const contentCodings = 'GZiP, bR'
+  const text = 'Hello, World!'
+
+  const server = createServer((req, res) => {
+    const gzip = createGzip()
+    const brotli = createBrotliCompress()
+
+    res.setHeader('Content-Encoding', contentCodings)
+    res.setHeader('Content-Type', 'text/plain')
+
+    brotli.pipe(gzip).pipe(res)
+
+    brotli.write(text)
+    brotli.end()
+  }).listen(0)
+
+  t.teardown(server.close.bind(server))
+  await once(server, 'listening')
+
+  const response = await fetch(`http://localhost:${server.address().port}`)
+
+  t.equal(await response.text(), text)
+  t.equal(response.headers.get('content-encoding'), contentCodings)
+})
diff --git a/test/fetch/fetch-leak.js b/test/fetch/fetch-leak.js
new file mode 100644
index 00000000000..e7a260208e3
--- /dev/null
+++ b/test/fetch/fetch-leak.js
@@ -0,0 +1,43 @@
+'use strict'
+
+const { test } = require('tap')
+const { fetch } = require('../..')
+const { createServer } = require('http')
+
+test('do not leak', (t) => {
+  t.plan(1)
+
+  const server = createServer((req, res) => {
+    res.end()
+  })
+  t.teardown(server.close.bind(server))
+
+  let url
+  let done = false
+  server.listen(0, function attack () {
+    if (done) {
+      return
+    }
+    url ??= new URL(`http://127.0.0.1:${server.address().port}`)
+    const controller = new AbortController()
+    fetch(url, { signal: controller.signal })
+      .then(res => res.arrayBuffer())
+      .then(attack)
+  })
+
+  let prev = Infinity
+  let count = 0
+  const interval = setInterval(() => {
+    done = true
+    global.gc()
+    const next = process.memoryUsage().heapUsed
+    if (next <= prev) {
+      t.pass()
+    } else if (count++ > 10) {
+      t.fail()
+    } else {
+      prev = next
+    }
+  }, 1e3)
+  t.teardown(() => clearInterval(interval))
+})
diff --git a/test/fetch/fetch-timeouts.js b/test/fetch/fetch-timeouts.js
new file mode 100644
index 00000000000..b659aaa08d6
--- /dev/null
+++ b/test/fetch/fetch-timeouts.js
@@ -0,0 +1,56 @@
+'use strict'
+
+const { test } = require('tap')
+
+const { fetch, Agent } = require('../..')
+const timers = require('../../lib/timers')
+const { createServer } = require('http')
+const FakeTimers = require('@sinonjs/fake-timers')
+
+test('Fetch very long request, timeout overridden so no error', (t) => {
+  const minutes = 6
+  const msToDelay = 1000 * 60 * minutes
+
+  t.setTimeout(undefined)
+  t.plan(1)
+
+  const clock = FakeTimers.install()
+  t.teardown(clock.uninstall.bind(clock))
+
+  const orgTimers = { ...timers }
+  Object.assign(timers, { setTimeout, clearTimeout })
+  t.teardown(() => {
+    Object.assign(timers, orgTimers)
+  })
+
+  const server = createServer((req, res) => {
+    setTimeout(() => {
+      res.end('hello')
+    }, msToDelay)
+    clock.tick(msToDelay + 1)
+  })
+  t.teardown(server.close.bind(server))
+
+  server.listen(0, () => {
+    fetch(`http://localhost:${server.address().port}`, {
+      path: '/',
+      method: 'GET',
+      dispatcher: new Agent({
+        headersTimeout: 0,
+        connectTimeout: 0,
+        bodyTimeout: 0
+      })
+    })
+      .then((response) => response.text())
+      .then((response) => {
+        t.equal('hello', response)
+        t.end()
+      })
+      .catch((err) => {
+        // This should not happen, a timeout error should not occur
+        t.error(err)
+      })
+
+    clock.tick(msToDelay - 1)
+  })
+})
diff --git a/test/fetch/formdata.js b/test/fetch/formdata.js
index e91893f1aa6..fed95bfb3da 100644
--- a/test/fetch/formdata.js
+++ b/test/fetch/formdata.js
@@ -4,6 +4,8 @@ const { test } = require('tap')
 const { FormData, File, Response } = require('../../')
 const { Blob: ThirdPartyBlob } = require('formdata-node')
 const { Blob } = require('buffer')
+const { isFormDataLike } = require('../../lib/core/util')
+const ThirdPartyFormDataInvalid = require('form-data')
 
 test('arg validation', (t) => {
   const form = new FormData()
@@ -285,6 +287,88 @@ test('formData.constructor.name', (t) => {
   t.end()
 })
 
+test('formData should be an instance of FormData', (t) => {
+  t.plan(3)
+
+  t.test('Invalid class FormData', (t) => {
+    class FormData {
+      constructor () {
+        this.data = []
+      }
+
+      append (key, value) {
+        this.data.push([key, value])
+      }
+
+      get (key) {
+        return this.data.find(([k]) => k === key)
+      }
+    }
+
+    const form = new FormData()
+    t.equal(isFormDataLike(form), false)
+    t.end()
+  })
+
+  t.test('Invalid function FormData', (t) => {
+    function FormData () {
+      const data = []
+      return {
+        append (key, value) {
+          data.push([key, value])
+        },
+        get (key) {
+          return data.find(([k]) => k === key)
+        }
+      }
+    }
+
+    const form = new FormData()
+    t.equal(isFormDataLike(form), false)
+    t.end()
+  })
+
+  test('Invalid third-party FormData', (t) => {
+    const form = new ThirdPartyFormDataInvalid()
+    t.equal(isFormDataLike(form), false)
+    t.end()
+  })
+
+  t.test('Valid FormData', (t) => {
+    const form = new FormData()
+    t.equal(isFormDataLike(form), true)
+    t.end()
+  })
+})
+
+test('FormData should be compatible with third-party libraries', (t) => {
+  t.plan(1)
+
+  class FormData {
+    constructor () {
+      this.data = []
+    }
+
+    get [Symbol.toStringTag] () {
+      return 'FormData'
+    }
+
+    append () {}
+    delete () {}
+    get () {}
+    getAll () {}
+    has () {}
+    set () {}
+    entries () {}
+    keys () {}
+    values () {}
+    forEach () {}
+  }
+
+  const form = new FormData()
+  t.equal(isFormDataLike(form), true)
+})
+
 test('arguments', (t) => {
   t.equal(FormData.constructor.length, 1)
   t.equal(FormData.prototype.append.length, 2)
diff --git a/test/fetch/headers.js b/test/fetch/headers.js
index f4508d01fd9..b91609dc383 100644
--- a/test/fetch/headers.js
+++ b/test/fetch/headers.js
@@ -3,6 +3,9 @@
 const tap = require('tap')
 const { Headers, fill } = require('../../lib/fetch/headers')
 const { kGuard } = require('../../lib/fetch/symbols')
+const { once } = require('events')
+const { fetch } = require('../..')
+const { createServer } = require('http')
 
 tap.test('Headers initialization', t => {
   t.plan(8)
@@ -665,3 +668,49 @@ tap.test('invalid headers', (t) => {
 
   t.end()
 })
+
+tap.test('headers that might cause a ReDoS', (t) => {
+  t.doesNotThrow(() => {
+    // This test will time out if the ReDoS attack is successful.
+    const headers = new Headers()
+    const attack = 'a' + '\t'.repeat(500_000) + '\ta'
+    headers.append('fhqwhgads', attack)
+  })
+
+  t.end()
+})
+
+tap.test('Headers.prototype.getSetCookie', (t) => {
+  t.test('Mutating the returned list does not affect the set-cookie list', (t) => {
+    const h = new Headers([
+      ['set-cookie', 'a=b'],
+      ['set-cookie', 'c=d']
+    ])
+
+    const old = h.getSetCookie()
+    h.getSetCookie().push('oh=no')
+    const now = h.getSetCookie()
+
+    t.same(old, now)
+    t.end()
+  })
+
+  // https://github.com/nodejs/undici/issues/1935
+  t.test('When Headers are cloned, so are the cookies', async (t) => {
+    const server = createServer((req, res) => {
+      res.setHeader('Set-Cookie', 'test=onetwo')
+      res.end('Hello World!')
+    }).listen(0)
+
+    await once(server, 'listening')
+    t.teardown(server.close.bind(server))
+
+    const res = await fetch(`http://localhost:${server.address().port}`)
+    const entries = Object.fromEntries(res.headers.entries())
+
+    t.same(res.headers.getSetCookie(), ['test=onetwo'])
+    t.ok('set-cookie' in entries)
+  })
+
+  t.end()
+})
diff --git a/test/fetch/issue-1137.js b/test/fetch/issue-1137.js
deleted file mode 100644
index 2b1585f9c3b..00000000000
--- a/test/fetch/issue-1137.js
+++ /dev/null
@@ -1,24 +0,0 @@
-'use strict'
-
-const { fetch } = require('../..')
-const { test } = require('tap')
-
-/* global AbortController */
-const controller = new AbortController()
-
-test('abort fetch', (t) => {
-  fetch(
-    'https://speed.hetzner.de/100MB.bin', {
-      signal: controller.signal
-    }).then(response => {
-    (async () => {
-      try {
-        await response.text()
-      } catch (err) {
-        t.equal(err.name, 'AbortError')
-      }
-      t.end()
-    })()
-    controller.abort()
-  })
-})
diff --git a/test/fetch/issue-2009.js b/test/fetch/issue-2009.js
new file mode 100644
index 00000000000..0b7b3e9812e
--- /dev/null
+++ b/test/fetch/issue-2009.js
@@ -0,0 +1,28 @@
+'use strict'
+
+const { test } = require('tap')
+const { fetch } = require('../..')
+const { createServer } = require('http')
+const { once } = require('events')
+
+test('issue 2009', async (t) => {
+  const server = createServer((req, res) => {
+    res.setHeader('a', 'b')
+    res.flushHeaders()
+
+    res.socket.end()
+  }).listen(0)
+
+  t.teardown(server.close.bind(server))
+  await once(server, 'listening')
+
+  for (let i = 0; i < 10; i++) {
+    await t.resolves(
+      fetch(`http://localhost:${server.address().port}`).then(
+        async (resp) => {
+          await resp.body.cancel('Some message')
+        }
+      )
+    )
+  }
+})
diff --git a/test/fetch/issue-2021.js b/test/fetch/issue-2021.js
new file mode 100644
index 00000000000..cd28a7165d7
--- /dev/null
+++ b/test/fetch/issue-2021.js
@@ -0,0 +1,32 @@
+'use strict'
+
+const { test } = require('tap')
+const { once } = require('events')
+const { createServer } = require('http')
+const { fetch } = require('../..')
+
+// https://github.com/nodejs/undici/issues/2021
+test('content-length header is removed on redirect', async (t) => {
+  const server = createServer((req, res) => {
+    if (req.url === '/redirect') {
+      res.writeHead(302, { Location: '/redirect2' })
+      res.end()
+      return
+    }
+
+    res.end()
+  }).listen(0).unref()
+
+  t.teardown(server.close.bind(server))
+  await once(server, 'listening')
+
+  const body = 'a+b+c'
+
+  await t.resolves(fetch(`http://localhost:${server.address().port}/redirect`, {
+    method: 'POST',
+    body,
+    headers: {
+      'content-length': Buffer.byteLength(body)
+    }
+  }))
+})
diff --git a/test/fetch/issue-node-46525.js b/test/fetch/issue-node-46525.js
new file mode 100644
index 00000000000..6fd9810c52b
--- /dev/null
+++ b/test/fetch/issue-node-46525.js
@@ -0,0 +1,28 @@
+'use strict'
+
+const { once } = require('events')
+const { createServer } = require('http')
+const { test } = require('tap')
+const { fetch } = require('../..')
+
+// https://github.com/nodejs/node/issues/46525
+test('No warning when reusing AbortController', async (t) => {
+  function onWarning (error) {
+    t.error(error, 'Got warning')
+  }
+
+  const server = createServer((req, res) => res.end()).listen(0)
+
+  await once(server, 'listening')
+
+  process.on('warning', onWarning)
+  t.teardown(() => {
+    process.off('warning', onWarning)
+    return server.close()
+  })
+
+  const controller = new AbortController()
+  for (let i = 0; i < 15; i++) {
+    await fetch(`http://localhost:${server.address().port}`, { signal: controller.signal })
+  }
+})
diff --git a/test/fetch/jsdom-abortcontroller-1910-1464495619.js b/test/fetch/jsdom-abortcontroller-1910-1464495619.js
new file mode 100644
index 00000000000..fad1e77c12b
--- /dev/null
+++ b/test/fetch/jsdom-abortcontroller-1910-1464495619.js
@@ -0,0 +1,22 @@
+'use strict'
+
+const { test } = require('tap')
+const { createServer } = require('http')
+const { once } = require('events')
+const { fetch } = require('../..')
+const { JSDOM } = require('jsdom')
+
+// https://github.com/nodejs/undici/pull/1910#issuecomment-1464495619
+test('third party AbortControllers', async (t) => {
+  const server = createServer((_, res) => res.end()).listen(0)
+
+  t.teardown(server.close.bind(server))
+  await once(server, 'listening')
+
+  const { AbortController } = new JSDOM().window
+  const controller = new AbortController()
+
+  await t.resolves(fetch(`http://localhost:${server.address().port}`, {
+    signal: controller.signal
+  }))
+})
diff --git a/test/fetch/redirect.js b/test/fetch/redirect.js
index c43ee482133..7e3681b3d23 100644
--- a/test/fetch/redirect.js
+++ b/test/fetch/redirect.js
@@ -27,3 +27,24 @@ test('Redirecting with a body does not cancel the current request - #1776', asyn
   t.equal(await resp.text(), '/redirect/')
   t.ok(resp.redirected)
 })
+
+test('Redirecting with an empty body does not throw an error - #2027', async (t) => {
+  const server = createServer((req, res) => {
+    if (req.url === '/redirect') {
+      res.statusCode = 307
+      res.setHeader('location', '/redirect/')
+      res.write('<a href="/redirect/">Moved Permanently</a>')
+      res.end()
+      return
+    }
+    res.write(req.url)
+    res.end()
+  }).listen(0)
+
+  t.teardown(server.close.bind(server))
+  await once(server, 'listening')
+
+  const resp = await fetch(`http://localhost:${server.address().port}/redirect`, { method: 'PUT', body: '' })
+  t.equal(await resp.text(), '/redirect/')
+  t.ok(resp.redirected)
+})
diff --git a/test/fetch/request.js b/test/fetch/request.js
index de91df91479..cd32adc7d6f 100644
--- a/test/fetch/request.js
+++ b/test/fetch/request.js
@@ -13,7 +13,8 @@ const {
   Blob: ThirdPartyBlob,
   FormData: ThirdPartyFormData
 } = require('formdata-node')
-const hasSignalReason = !!~process.version.localeCompare('v16.14.0', undefined, { numeric: true })
+
+const hasSignalReason = 'reason' in AbortSignal.prototype
 
 test('arg validation', async (t) => {
   // constructor
@@ -459,3 +460,19 @@ test('constructing Request with third party FormData body', async (t) => {
   t.equal(contentType[0], 'multipart/form-data; boundary')
   t.ok((await req.text()).startsWith(`--${contentType[1]}`))
 })
+
+// https://github.com/nodejs/undici/issues/2050
+test('set-cookie headers get cleared when passing a Request as first param', (t) => {
+  const req1 = new Request('http://localhost', {
+    headers: {
+      'set-cookie': 'a=1'
+    }
+  })
+
+  t.same([...req1.headers], [['set-cookie', 'a=1']])
+  const req2 = new Request(req1, { headers: {} })
+
+  t.same([...req2.headers], [])
+  t.same(req2.headers.getSetCookie(), [])
+  t.end()
+})
diff --git a/test/fetch/resource-timing.js b/test/fetch/resource-timing.js
index 2481887bab6..885e3b3c171 100644
--- a/test/fetch/resource-timing.js
+++ b/test/fetch/resource-timing.js
@@ -2,6 +2,7 @@
 
 const { test } = require('tap')
 const { createServer } = require('http')
+const { nodeMajor, nodeMinor } = require('../../lib/core/util')
 const { fetch } = require('../..')
 
 const {
@@ -9,12 +10,10 @@ const {
   performance
 } = require('perf_hooks')
 
-const semver = require('semver')
-
-const skip = semver.lt(process.version, '18.2.0')
+const skip = nodeMajor < 18 || (nodeMajor === 18 && nodeMinor < 2)
 
 test('should create a PerformanceResourceTiming after each fetch request', { skip }, (t) => {
-  t.plan(4)
+  t.plan(6)
   const obs = new PerformanceObserver(list => {
     const entries = list.getEntries()
     t.equal(entries.length, 1)
@@ -26,6 +25,9 @@ test('should create a PerformanceResourceTiming after each fetch request', { ski
     })
     t.strictSame(entry.entryType, 'resource')
 
+    t.ok(entry.duration >= 0)
+    t.ok(entry.startTime >= 0)
+
     obs.disconnect()
     performance.clearResourceTimings()
   })
diff --git a/test/fetch/util.js b/test/fetch/util.js
index 5d6af5ce62b..02b75bc7783 100644
--- a/test/fetch/util.js
+++ b/test/fetch/util.js
@@ -111,6 +111,16 @@ test('sameOrigin', (t) => {
     t.end()
   })
 
+  t.test('file:// urls', (t) => {
+    // urls with opaque origins should return true
+
+    const a = new URL('file:///C:/undici')
+    const b = new URL('file:///var/undici')
+
+    t.ok(util.sameOrigin(a, b))
+    t.end()
+  })
+
   t.end()
 })
 
@@ -269,79 +279,3 @@ test('setRequestReferrerPolicyOnRedirect', nested => {
     t.equal(request.referrerPolicy, initial)
   })
 })
-
-test('determineRequestsReferrer', (t) => {
-  t.plan(7)
-
-  t.test('Should handle empty referrerPolicy', (tt) => {
-    tt.plan(2)
-    tt.equal(util.determineRequestsReferrer({}), 'no-referrer')
-    tt.equal(util.determineRequestsReferrer({ referrerPolicy: '' }), 'no-referrer')
-  })
-
-  t.test('Should handle "no-referrer" referrerPolicy', (tt) => {
-    tt.plan(1)
-    tt.equal(util.determineRequestsReferrer({ referrerPolicy: 'no-referrer' }), 'no-referrer')
-  })
-
-  t.test('Should return "no-referrer" if request referrer is absent', (tt) => {
-    tt.plan(1)
-    tt.equal(util.determineRequestsReferrer({
-      referrerPolicy: 'origin'
-    }), 'no-referrer')
-  })
-
-  t.test('Should return "no-referrer" if scheme is local scheme', (tt) => {
-    tt.plan(3)
-    const referrerSources = [
-      new URL('data:something'),
-      new URL('about:blank'),
-      new URL('blob:https://video_url')]
-
-    for (const source of referrerSources) {
-      tt.equal(util.determineRequestsReferrer({
-        referrerPolicy: 'origin',
-        referrer: source
-      }), 'no-referrer')
-    }
-  })
-
-  t.test('Should return "no-referrer" if the request referrer is neither client nor instance of URL', (tt) => {
-    tt.plan(4)
-    const requests = [
-      { referrerPolicy: 'origin', referrer: 'string' },
-      { referrerPolicy: 'origin', referrer: null },
-      { referrerPolicy: 'origin', referrer: undefined },
-      { referrerPolicy: 'origin', referrer: '' }
-    ]
-
-    for (const request of requests) {
-      tt.equal(util.determineRequestsReferrer(request), 'no-referrer')
-    }
-  })
-
-  t.test('Should return referrer origin on referrerPolicy origin', (tt) => {
-    tt.plan(1)
-    const expectedRequest = {
-      referrerPolicy: 'origin',
-      referrer: new URL('http://example:12345@example.com')
-    }
-
-    tt.equal(util.determineRequestsReferrer(expectedRequest), expectedRequest.referrer.origin)
-  })
-
-  t.test('Should return referrer url on referrerPolicy unsafe-url', (tt) => {
-    tt.plan(1)
-    const expectedRequest = {
-      referrerPolicy: 'unsafe-url',
-      referrer: new URL('http://example:12345@example.com/hello/world')
-    }
-
-    const expectedReffererUrl = new URL(expectedRequest.referrer.href)
-
-    expectedReffererUrl.username = ''
-    expectedReffererUrl.password = ''
-
-    tt.equal(util.determineRequestsReferrer(expectedRequest), expectedReffererUrl.href)
-  })
-})
diff --git a/test/headers-crlf.js b/test/headers-crlf.js
new file mode 100644
index 00000000000..b24fd391491
--- /dev/null
+++ b/test/headers-crlf.js
@@ -0,0 +1,36 @@
+'use strict'
+
+const { test } = require('tap')
+const { Client } = require('..')
+const { createServer } = require('http')
+
+test('CRLF Injection in Nodejs ‘undici’ via host', (t) => {
+  t.plan(1)
+
+  const server = createServer(async (req, res) => {
+    res.end()
+  })
+  t.teardown(server.close.bind(server))
+
+  server.listen(0, async () => {
+    const client = new Client(`http://localhost:${server.address().port}`)
+    t.teardown(client.close.bind(client))
+
+    const unsanitizedContentTypeInput = '12 \r\n\r\naaa:aaa'
+
+    try {
+      const { body } = await client.request({
+        path: '/',
+        method: 'POST',
+        headers: {
+          'content-type': 'application/json',
+          host: unsanitizedContentTypeInput
+        },
+        body: 'asd'
+      })
+      await body.dump()
+    } catch (err) {
+      t.same(err.code, 'UND_ERR_INVALID_ARG')
+    }
+  })
+})
diff --git a/test/issue-1903.js b/test/issue-1903.js
new file mode 100644
index 00000000000..99eb6f60517
--- /dev/null
+++ b/test/issue-1903.js
@@ -0,0 +1,78 @@
+'use strict'
+
+const { createServer } = require('http')
+const { test } = require('tap')
+const { request } = require('..')
+const { nodeMajor } = require('../lib/core/util')
+
+function createPromise () {
+  const result = {}
+  result.promise = new Promise((resolve) => {
+    result.resolve = resolve
+  })
+  return result
+}
+
+test('should parse content-disposition consistently', { skip: nodeMajor >= 19 }, async (t) => {
+  t.plan(5)
+
+  // create promise to allow server spinup in parallel
+  const spinup1 = createPromise()
+  const spinup2 = createPromise()
+  const spinup3 = createPromise()
+
+  // variables to store content-disposition header
+  const header = []
+
+  const server = createServer((req, res) => {
+    res.writeHead(200, {
+      'content-length': 2,
+      'content-disposition': "attachment; filename='år.pdf'"
+    })
+    header.push("attachment; filename='år.pdf'")
+    res.end('OK', spinup1.resolve)
+  })
+  t.teardown(server.close.bind(server))
+  server.listen(0, spinup1.resolve)
+
+  const proxy1 = createServer(async (req, res) => {
+    const { statusCode, headers, body } = await request(`http://localhost:${server.address().port}`, {
+      method: 'GET'
+    })
+    header.push(headers['content-disposition'])
+    delete headers['transfer-encoding']
+    res.writeHead(statusCode, headers)
+    body.pipe(res)
+  })
+  t.teardown(proxy1.close.bind(proxy1))
+  proxy1.listen(0, spinup2.resolve)
+
+  const proxy2 = createServer(async (req, res) => {
+    const { statusCode, headers, body } = await request(`http://localhost:${proxy1.address().port}`, {
+      method: 'GET'
+    })
+    header.push(headers['content-disposition'])
+    delete headers['transfer-encoding']
+    res.writeHead(statusCode, headers)
+    body.pipe(res)
+  })
+  t.teardown(proxy2.close.bind(proxy2))
+  proxy2.listen(0, spinup3.resolve)
+
+  // wait until all server spinup
+  await Promise.all([spinup1.promise, spinup2.promise, spinup3.promise])
+
+  const { statusCode, headers, body } = await request(`http://localhost:${proxy2.address().port}`, {
+    method: 'GET'
+  })
+  header.push(headers['content-disposition'])
+  t.equal(statusCode, 200)
+  t.equal(await body.text(), 'OK')
+
+  // we check header
+  // must not be the same in first proxy
+  t.notSame(header[0], header[1])
+  // chaining always the same value
+  t.equal(header[1], header[2])
+  t.equal(header[2], header[3])
+})
diff --git a/test/jest/interceptor.test.js b/test/jest/interceptor.test.js
index c3a9bdeb682..73d70b7c9cd 100644
--- a/test/jest/interceptor.test.js
+++ b/test/jest/interceptor.test.js
@@ -5,6 +5,8 @@ const { Agent, request } = require('../../index')
 const DecoratorHandler = require('../../lib/handler/DecoratorHandler')
 /* global expect */
 
+const defaultOpts = { keepAliveTimeout: 10, keepAliveMaxTimeout: 10 }
+
 describe('interceptors', () => {
   let server
   beforeEach(async () => {
@@ -15,7 +17,7 @@ describe('interceptors', () => {
     await new Promise((resolve) => { server.listen(0, resolve) })
   })
   afterEach(async () => {
-    await server.close()
+    await new Promise((resolve) => server.close(resolve))
   })
 
   test('interceptors are applied on client from an agent', async () => {
@@ -29,8 +31,7 @@ describe('interceptors', () => {
       }
     }
 
-    // await new Promise(resolve => server.listen(0, () => resolve()))
-    const opts = { interceptors: { Client: [buildInterceptor] } }
+    const opts = { interceptors: { Client: [buildInterceptor] }, ...defaultOpts }
     const agent = new Agent(opts)
     const origin = new URL(`http://localhost:${server.address().port}`)
     await Promise.all([
@@ -58,7 +59,7 @@ describe('interceptors', () => {
       }
     }
 
-    const opts = { interceptors: { Pool: [setHeaderInterceptor, assertHeaderInterceptor] } }
+    const opts = { interceptors: { Pool: [setHeaderInterceptor, assertHeaderInterceptor] }, ...defaultOpts }
     const agent = new Agent(opts)
     const origin = new URL(`http://localhost:${server.address().port}`)
     await request(origin, { dispatcher: agent, headers: [] })
@@ -90,7 +91,7 @@ describe('interceptors', () => {
       }
     }
 
-    const opts = { interceptors: { Agent: [assertHeaderInterceptor, clearResponseHeadersInterceptor] } }
+    const opts = { interceptors: { Agent: [assertHeaderInterceptor, clearResponseHeadersInterceptor] }, ...defaultOpts }
     const agent = new Agent(opts)
     const origin = new URL(`http://localhost:${server.address().port}`)
     await request(origin, { dispatcher: agent, headers: [] })
@@ -178,7 +179,7 @@ describe('interceptors with NtlmRequestHandler', () => {
     await new Promise((resolve) => { server.listen(0, resolve) })
   })
   afterEach(async () => {
-    await server.close()
+    await new Promise((resolve) => server.close(resolve))
   })
 
   test('Retry interceptor on Client will use the same socket', async () => {
@@ -187,7 +188,7 @@ describe('interceptors with NtlmRequestHandler', () => {
         return dispatch(opts, new FakeNtlmRequestHandler(dispatch, opts, handler))
       }
     }
-    const opts = { interceptors: { Client: [interceptor] } }
+    const opts = { interceptors: { Client: [interceptor] }, ...defaultOpts }
     const agent = new Agent(opts)
     const origin = new URL(`http://localhost:${server.address().port}`)
     const { statusCode } = await request(origin, { dispatcher: agent, headers: [] })
diff --git a/test/mock-agent.js b/test/mock-agent.js
index f83f9406be9..4145432c2c6 100644
--- a/test/mock-agent.js
+++ b/test/mock-agent.js
@@ -7,14 +7,13 @@ const { request, setGlobalDispatcher, MockAgent, Agent } = require('..')
 const { getResponse } = require('../lib/mock/mock-utils')
 const { kClients, kConnected } = require('../lib/core/symbols')
 const { InvalidArgumentError, ClientDestroyedError } = require('../lib/core/errors')
+const { nodeMajor } = require('../lib/core/util')
 const MockClient = require('../lib/mock/mock-client')
 const MockPool = require('../lib/mock/mock-pool')
 const { kAgent } = require('../lib/mock/mock-symbols')
 const Dispatcher = require('../lib/dispatcher')
 const { MockNotMatchedError } = require('../lib/mock/mock-errors')
 
-const nodeMajor = Number(process.versions.node.split('.')[0])
-
 test('MockAgent - constructor', t => {
   t.plan(5)
 
diff --git a/test/mock-pool.js b/test/mock-pool.js
index 3e6907192e4..0ac1aac49ce 100644
--- a/test/mock-pool.js
+++ b/test/mock-pool.js
@@ -5,14 +5,13 @@ const { createServer } = require('http')
 const { promisify } = require('util')
 const { MockAgent, MockPool, getGlobalDispatcher, setGlobalDispatcher, request } = require('..')
 const { kUrl } = require('../lib/core/symbols')
+const { nodeMajor } = require('../lib/core/util')
 const { kDispatches } = require('../lib/mock/mock-symbols')
 const { InvalidArgumentError } = require('../lib/core/errors')
 const { MockInterceptor } = require('../lib/mock/mock-interceptor')
 const { getResponse } = require('../lib/mock/mock-utils')
 const Dispatcher = require('../lib/dispatcher')
 
-const nodeMajor = Number(process.versions.node.split('.', 1)[0])
-
 test('MockPool - constructor', t => {
   t.plan(3)
 
diff --git a/test/mock-utils.js b/test/mock-utils.js
index 5dd9e3cddf0..7799803ad2f 100644
--- a/test/mock-utils.js
+++ b/test/mock-utils.js
@@ -1,6 +1,7 @@
 'use strict'
 
 const { test } = require('tap')
+const { nodeMajor } = require('../lib/core/util')
 const { MockNotMatchedError } = require('../lib/mock/mock-errors')
 const {
   deleteMockDispatch,
@@ -144,7 +145,7 @@ test('getHeaderByName', (t) => {
   t.equal(getHeaderByName(headersArray, 'key'), 'value')
   t.equal(getHeaderByName(headersArray, 'anotherKey'), undefined)
 
-  if (Number(process.versions.node.split('.')[0]) >= 16) {
+  if (nodeMajor >= 16) {
     const { Headers } = require('../index')
 
     const headers = new Headers([
diff --git a/test/node-fetch/main.js b/test/node-fetch/main.js
index acefe825ea4..ab3ee9f70ae 100644
--- a/test/node-fetch/main.js
+++ b/test/node-fetch/main.js
@@ -1660,20 +1660,4 @@ describe('node-fetch', () => {
       expect(res.ok).to.be.false
     })
   })
-
-  // it('should not time out waiting for a response 60 seconds', function () {
-  //   this.timeout(65_000)
-  //   return fetch(`${base}timeout60s`).then(res => {
-  //     expect(res.status).to.equal(200)
-  //     expect(res.ok).to.be.true
-  //     return res.text().then(result => {
-  //       expect(result).to.equal('text')
-  //     })
-  //   })
-  // })
-
-  // it('should time out waiting for more than 300 seconds', function () {
-  //   this.timeout(305_000)
-  //   return expect(fetch(`${base}timeout300s`)).to.eventually.be.rejectedWith(TypeError)
-  // })
 })
diff --git a/test/node-fetch/utils/server.js b/test/node-fetch/utils/server.js
index e846465dbf7..46103055305 100644
--- a/test/node-fetch/utils/server.js
+++ b/test/node-fetch/utils/server.js
@@ -227,22 +227,6 @@ module.exports = class TestServer {
       }, 1000)
     }
 
-    if (p === '/timeout60s') {
-      setTimeout(() => {
-        res.statusCode = 200
-        res.setHeader('Content-Type', 'text/plain')
-        res.end('text')
-      }, 60_000)
-    }
-
-    if (p === '/timeout300s') {
-      setTimeout(() => {
-        res.statusCode = 200
-        res.setHeader('Content-Type', 'text/plain')
-        res.end('text')
-      }, 300_000)
-    }
-
     if (p === '/slow') {
       res.statusCode = 200
       res.setHeader('Content-Type', 'text/plain')
diff --git a/test/proxy-agent.js b/test/proxy-agent.js
index 03156395eff..3d8f9903bde 100644
--- a/test/proxy-agent.js
+++ b/test/proxy-agent.js
@@ -3,15 +3,15 @@
 const { test } = require('tap')
 const { request, fetch, setGlobalDispatcher, getGlobalDispatcher } = require('..')
 const { InvalidArgumentError } = require('../lib/core/errors')
+const { nodeMajor } = require('../lib/core/util')
 const { readFileSync } = require('fs')
 const { join } = require('path')
 const ProxyAgent = require('../lib/proxy-agent')
+const Pool = require('../lib/pool')
 const { createServer } = require('http')
 const https = require('https')
 const proxy = require('proxy')
 
-const nodeMajor = Number(process.versions.node.split('.', 1)[0])
-
 test('should throw error when no uri is provided', (t) => {
   t.plan(2)
   t.throws(() => new ProxyAgent(), InvalidArgumentError)
@@ -73,6 +73,45 @@ test('use proxy-agent to connect through proxy', async (t) => {
   proxyAgent.close()
 })
 
+test('use proxy agent to connect through proxy using Pool', async (t) => {
+  t.plan(3)
+  const server = await buildServer()
+  const proxy = await buildProxy()
+  let resolveFirstConnect
+  let connectCount = 0
+
+  proxy.authenticate = async function (req, fn) {
+    if (++connectCount === 2) {
+      t.pass('second connect should arrive while first is still inflight')
+      resolveFirstConnect()
+      fn(null, true)
+    } else {
+      await new Promise((resolve) => {
+        resolveFirstConnect = resolve
+      })
+      fn(null, true)
+    }
+  }
+
+  server.on('request', (req, res) => {
+    res.end()
+  })
+
+  const serverUrl = `http://localhost:${server.address().port}`
+  const proxyUrl = `http://localhost:${proxy.address().port}`
+  const clientFactory = (url, options) => {
+    return new Pool(url, options)
+  }
+  const proxyAgent = new ProxyAgent({ auth: Buffer.from('user:pass').toString('base64'), uri: proxyUrl, clientFactory })
+  const firstRequest = request(`${serverUrl}`, { dispatcher: proxyAgent })
+  const secondRequest = await request(`${serverUrl}`, { dispatcher: proxyAgent })
+  t.equal((await firstRequest).statusCode, 200)
+  t.equal(secondRequest.statusCode, 200)
+  server.close()
+  proxy.close()
+  proxyAgent.close()
+})
+
 test('use proxy-agent to connect through proxy using path with params', async (t) => {
   t.plan(6)
   const server = await buildServer()
@@ -197,6 +236,39 @@ test('use proxy-agent with token', async (t) => {
   proxyAgent.close()
 })
 
+test('use proxy-agent with custom headers', async (t) => {
+  t.plan(2)
+  const server = await buildServer()
+  const proxy = await buildProxy()
+
+  const serverUrl = `http://localhost:${server.address().port}`
+  const proxyUrl = `http://localhost:${proxy.address().port}`
+  const proxyAgent = new ProxyAgent({
+    uri: proxyUrl,
+    headers: {
+      'User-Agent': 'Foobar/1.0.0'
+    }
+  })
+
+  proxy.on('connect', (req) => {
+    t.equal(req.headers['user-agent'], 'Foobar/1.0.0')
+  })
+
+  server.on('request', (req, res) => {
+    t.equal(req.headers['user-agent'], 'BarBaz/1.0.0')
+    res.end()
+  })
+
+  await request(serverUrl + '/hello?foo=bar', {
+    headers: { 'user-agent': 'BarBaz/1.0.0' },
+    dispatcher: proxyAgent
+  })
+
+  server.close()
+  proxy.close()
+  proxyAgent.close()
+})
+
 test('sending proxy-authorization in request headers should throw', async (t) => {
   t.plan(3)
   const server = await buildServer()
diff --git a/test/redirect-request.js b/test/redirect-request.js
index 2915f1e224a..f996bfa8231 100644
--- a/test/redirect-request.js
+++ b/test/redirect-request.js
@@ -2,6 +2,7 @@
 
 const t = require('tap')
 const undici = require('..')
+const { nodeMajor } = require('../lib/core/util')
 const {
   startRedirectingServer,
   startRedirectingWithBodyServer,
@@ -13,8 +14,6 @@ const {
 } = require('./utils/redirecting-servers')
 const { createReadable, createReadableStream } = require('./utils/stream')
 
-const nodeMajor = Number(process.versions.node.split('.')[0])
-
 for (const factory of [
   (server, opts) => new undici.Agent(opts),
   (server, opts) => new undici.Pool(`http://${server}`, opts),
diff --git a/test/request-timeout.js b/test/request-timeout.js
index 2d2e826acac..3ec5c107e79 100644
--- a/test/request-timeout.js
+++ b/test/request-timeout.js
@@ -4,6 +4,8 @@ const { test } = require('tap')
 const { createReadStream, writeFileSync, unlinkSync } = require('fs')
 const { Client, errors } = require('..')
 const { kConnect } = require('../lib/core/symbols')
+const { nodeMajor } = require('../lib/core/util')
+const timers = require('../lib/timers')
 const { createServer } = require('http')
 const EventEmitter = require('events')
 const FakeTimers = require('@sinonjs/fake-timers')
@@ -15,8 +17,6 @@ const {
   PassThrough
 } = require('stream')
 
-const nodeMajor = Number(process.versions.node.split('.')[0])
-
 test('request timeout', (t) => {
   t.plan(1)
 
@@ -65,6 +65,12 @@ test('body timeout', (t) => {
   const clock = FakeTimers.install()
   t.teardown(clock.uninstall.bind(clock))
 
+  const orgTimers = { ...timers }
+  Object.assign(timers, { setTimeout, clearTimeout })
+  t.teardown(() => {
+    Object.assign(timers, orgTimers)
+  })
+
   const server = createServer((req, res) => {
     res.write('hello')
   })
@@ -93,6 +99,12 @@ test('overridden request timeout', (t) => {
   const clock = FakeTimers.install()
   t.teardown(clock.uninstall.bind(clock))
 
+  const orgTimers = { ...timers }
+  Object.assign(timers, { setTimeout, clearTimeout })
+  t.teardown(() => {
+    Object.assign(timers, orgTimers)
+  })
+
   const server = createServer((req, res) => {
     setTimeout(() => {
       res.end('hello')
@@ -119,6 +131,12 @@ test('overridden body timeout', (t) => {
   const clock = FakeTimers.install()
   t.teardown(clock.uninstall.bind(clock))
 
+  const orgTimers = { ...timers }
+  Object.assign(timers, { setTimeout, clearTimeout })
+  t.teardown(() => {
+    Object.assign(timers, orgTimers)
+  })
+
   const server = createServer((req, res) => {
     res.write('hello')
   })
@@ -147,6 +165,12 @@ test('With EE signal', (t) => {
   const clock = FakeTimers.install()
   t.teardown(clock.uninstall.bind(clock))
 
+  const orgTimers = { ...timers }
+  Object.assign(timers, { setTimeout, clearTimeout })
+  t.teardown(() => {
+    Object.assign(timers, orgTimers)
+  })
+
   const server = createServer((req, res) => {
     setTimeout(() => {
       res.end('hello')
@@ -176,6 +200,12 @@ test('With abort-controller signal', (t) => {
   const clock = FakeTimers.install()
   t.teardown(clock.uninstall.bind(clock))
 
+  const orgTimers = { ...timers }
+  Object.assign(timers, { setTimeout, clearTimeout })
+  t.teardown(() => {
+    Object.assign(timers, orgTimers)
+  })
+
   const server = createServer((req, res) => {
     setTimeout(() => {
       res.end('hello')
@@ -205,6 +235,12 @@ test('Abort before timeout (EE)', (t) => {
   const clock = FakeTimers.install()
   t.teardown(clock.uninstall.bind(clock))
 
+  const orgTimers = { ...timers }
+  Object.assign(timers, { setTimeout, clearTimeout })
+  t.teardown(() => {
+    Object.assign(timers, orgTimers)
+  })
+
   const ee = new EventEmitter()
   const server = createServer((req, res) => {
     setTimeout(() => {
@@ -234,6 +270,12 @@ test('Abort before timeout (abort-controller)', (t) => {
   const clock = FakeTimers.install()
   t.teardown(clock.uninstall.bind(clock))
 
+  const orgTimers = { ...timers }
+  Object.assign(timers, { setTimeout, clearTimeout })
+  t.teardown(() => {
+    Object.assign(timers, orgTimers)
+  })
+
   const abortController = new AbortController()
   const server = createServer((req, res) => {
     setTimeout(() => {
@@ -263,6 +305,12 @@ test('Timeout with pipelining', (t) => {
   const clock = FakeTimers.install()
   t.teardown(clock.uninstall.bind(clock))
 
+  const orgTimers = { ...timers }
+  Object.assign(timers, { setTimeout, clearTimeout })
+  t.teardown(() => {
+    Object.assign(timers, orgTimers)
+  })
+
   const server = createServer((req, res) => {
     setTimeout(() => {
       res.end('hello')
@@ -298,6 +346,12 @@ test('Global option', (t) => {
   const clock = FakeTimers.install()
   t.teardown(clock.uninstall.bind(clock))
 
+  const orgTimers = { ...timers }
+  Object.assign(timers, { setTimeout, clearTimeout })
+  t.teardown(() => {
+    Object.assign(timers, orgTimers)
+  })
+
   const server = createServer((req, res) => {
     setTimeout(() => {
       res.end('hello')
@@ -326,6 +380,12 @@ test('Request options overrides global option', (t) => {
   const clock = FakeTimers.install()
   t.teardown(clock.uninstall.bind(clock))
 
+  const orgTimers = { ...timers }
+  Object.assign(timers, { setTimeout, clearTimeout })
+  t.teardown(() => {
+    Object.assign(timers, orgTimers)
+  })
+
   const server = createServer((req, res) => {
     setTimeout(() => {
       res.end('hello')
@@ -377,6 +437,12 @@ test('client.close should wait for the timeout', (t) => {
   const clock = FakeTimers.install()
   t.teardown(clock.uninstall.bind(clock))
 
+  const orgTimers = { ...timers }
+  Object.assign(timers, { setTimeout, clearTimeout })
+  t.teardown(() => {
+    Object.assign(timers, orgTimers)
+  })
+
   const server = createServer((req, res) => {
   })
   t.teardown(server.close.bind(server))
@@ -449,6 +515,12 @@ test('Disable request timeout', (t) => {
   const clock = FakeTimers.install()
   t.teardown(clock.uninstall.bind(clock))
 
+  const orgTimers = { ...timers }
+  Object.assign(timers, { setTimeout, clearTimeout })
+  t.teardown(() => {
+    Object.assign(timers, orgTimers)
+  })
+
   const server = createServer((req, res) => {
     setTimeout(() => {
       res.end('hello')
@@ -485,6 +557,12 @@ test('Disable request timeout for a single request', (t) => {
   const clock = FakeTimers.install()
   t.teardown(clock.uninstall.bind(clock))
 
+  const orgTimers = { ...timers }
+  Object.assign(timers, { setTimeout, clearTimeout })
+  t.teardown(() => {
+    Object.assign(timers, orgTimers)
+  })
+
   const server = createServer((req, res) => {
     setTimeout(() => {
       res.end('hello')
@@ -521,11 +599,17 @@ test('stream timeout', (t) => {
   const clock = FakeTimers.install()
   t.teardown(clock.uninstall.bind(clock))
 
+  const orgTimers = { ...timers }
+  Object.assign(timers, { setTimeout, clearTimeout })
+  t.teardown(() => {
+    Object.assign(timers, orgTimers)
+  })
+
   const server = createServer((req, res) => {
     setTimeout(() => {
       res.end('hello')
-    }, 31e3)
-    clock.tick(31e3)
+    }, 301e3)
+    clock.tick(301e3)
   })
   t.teardown(server.close.bind(server))
 
@@ -551,6 +635,12 @@ test('stream custom timeout', (t) => {
   const clock = FakeTimers.install()
   t.teardown(clock.uninstall.bind(clock))
 
+  const orgTimers = { ...timers }
+  Object.assign(timers, { setTimeout, clearTimeout })
+  t.teardown(() => {
+    Object.assign(timers, orgTimers)
+  })
+
   const server = createServer((req, res) => {
     setTimeout(() => {
       res.end('hello')
@@ -583,11 +673,17 @@ test('pipeline timeout', (t) => {
   const clock = FakeTimers.install()
   t.teardown(clock.uninstall.bind(clock))
 
+  const orgTimers = { ...timers }
+  Object.assign(timers, { setTimeout, clearTimeout })
+  t.teardown(() => {
+    Object.assign(timers, orgTimers)
+  })
+
   const server = createServer((req, res) => {
     setTimeout(() => {
       req.pipe(res)
-    }, 31e3)
-    clock.tick(31e3)
+    }, 301e3)
+    clock.tick(301e3)
   })
   t.teardown(server.close.bind(server))
 
@@ -632,6 +728,12 @@ test('pipeline timeout', (t) => {
   const clock = FakeTimers.install()
   t.teardown(clock.uninstall.bind(clock))
 
+  const orgTimers = { ...timers }
+  Object.assign(timers, { setTimeout, clearTimeout })
+  t.teardown(() => {
+    Object.assign(timers, orgTimers)
+  })
+
   const server = createServer((req, res) => {
     setTimeout(() => {
       req.pipe(res)
@@ -683,6 +785,12 @@ test('client.close should not deadlock', (t) => {
   const clock = FakeTimers.install()
   t.teardown(clock.uninstall.bind(clock))
 
+  const orgTimers = { ...timers }
+  Object.assign(timers, { setTimeout, clearTimeout })
+  t.teardown(() => {
+    Object.assign(timers, orgTimers)
+  })
+
   const server = createServer((req, res) => {
   })
   t.teardown(server.close.bind(server))
diff --git a/test/socket-timeout.js b/test/socket-timeout.js
index 6ce58369643..8019c74198a 100644
--- a/test/socket-timeout.js
+++ b/test/socket-timeout.js
@@ -2,6 +2,7 @@
 
 const { test } = require('tap')
 const { Client, errors } = require('..')
+const timers = require('../lib/timers')
 const { createServer } = require('http')
 const FakeTimers = require('@sinonjs/fake-timers')
 
@@ -64,6 +65,12 @@ test('Disable socket timeout', (t) => {
   const clock = FakeTimers.install()
   t.teardown(clock.uninstall.bind(clock))
 
+  const orgTimers = { ...timers }
+  Object.assign(timers, { setTimeout, clearTimeout })
+  t.teardown(() => {
+    Object.assign(timers, orgTimers)
+  })
+
   server.once('request', (req, res) => {
     setTimeout(() => {
       res.end('hello')
diff --git a/test/tls-client-cert.js b/test/tls-client-cert.js
index ecbbbec1850..8ae301d8fca 100644
--- a/test/tls-client-cert.js
+++ b/test/tls-client-cert.js
@@ -6,7 +6,7 @@ const https = require('https')
 const { test } = require('tap')
 const { Client } = require('..')
 const { kSocket } = require('../lib/core/symbols')
-const nodeMajor = Number(process.versions.node.split('.')[0])
+const { nodeMajor } = require('../lib/core/util')
 
 const serverOptions = {
   ca: [
diff --git a/test/tls-session-reuse.js b/test/tls-session-reuse.js
index 161d48a360d..147e92fd76b 100644
--- a/test/tls-session-reuse.js
+++ b/test/tls-session-reuse.js
@@ -7,8 +7,7 @@ const crypto = require('crypto')
 const { test } = require('tap')
 const { Client, Pool } = require('..')
 const { kSocket } = require('../lib/core/symbols')
-
-const nodeMajor = Number(process.versions.node.split('.')[0])
+const { nodeMajor } = require('../lib/core/util')
 
 const options = {
   key: readFileSync(join(__dirname, 'fixtures', 'key.pem'), 'utf8'),
diff --git a/test/types/balanced-pool.test-d.ts b/test/types/balanced-pool.test-d.ts
index d4628b9487a..d7ccf7be8d4 100644
--- a/test/types/balanced-pool.test-d.ts
+++ b/test/types/balanced-pool.test-d.ts
@@ -10,6 +10,7 @@ expectAssignable<BalancedPool>(new BalancedPool('', { factory: () => new Dispatc
 expectAssignable<BalancedPool>(new BalancedPool('', { factory: (origin, opts) => new Client(origin, opts) }))
 expectAssignable<BalancedPool>(new BalancedPool('', { connections: 1 }))
 expectAssignable<BalancedPool>(new BalancedPool(['http://localhost:4242', 'http://www.nodejs.org']))
+expectAssignable<BalancedPool>(new BalancedPool([new URL('http://localhost:4242'),new URL('http://www.nodejs.org')], {}))
 
 {
   const pool = new BalancedPool('', {})
@@ -21,6 +22,8 @@ expectAssignable<BalancedPool>(new BalancedPool(['http://localhost:4242', 'http:
   // upstreams
   expectAssignable<BalancedPool>(pool.addUpstream('http://www.nodejs.org'))
   expectAssignable<BalancedPool>(pool.removeUpstream('http://www.nodejs.org'))
+  expectAssignable<BalancedPool>(pool.addUpstream(new URL('http://www.nodejs.org')))
+  expectAssignable<BalancedPool>(pool.removeUpstream(new URL('http://www.nodejs.org')))
   expectAssignable<string[]>(pool.upstreams)
 
 
diff --git a/test/types/client.test-d.ts b/test/types/client.test-d.ts
index 4895345c412..d9c1e447813 100644
--- a/test/types/client.test-d.ts
+++ b/test/types/client.test-d.ts
@@ -13,6 +13,63 @@ expectAssignable<Client>(new Client('', {
 }))
 expectAssignable<Client>(new Client(new URL('http://localhost'), {}))
 
+/**
+ * Tests for Client.Options:
+ */
+{
+  expectAssignable<Client>(new Client('', {
+    maxHeaderSize: 16384
+  }))
+  expectAssignable<Client>(new Client('', {
+    headersTimeout: 300e3
+  }))
+  expectAssignable<Client>(new Client('', {
+    connectTimeout: 300e3
+  }))
+  expectAssignable<Client>(new Client('', {
+    bodyTimeout: 300e3
+  }))
+  expectAssignable<Client>(new Client('', {
+    keepAliveTimeout: 4e3
+  }))
+  expectAssignable<Client>(new Client('', {
+    keepAliveMaxTimeout: 600e3
+  }))
+  expectAssignable<Client>(new Client('', {
+    keepAliveTimeoutThreshold: 1e3
+  }))
+  expectAssignable<Client>(new Client('', {
+    socketPath: '/var/run/docker.sock'
+  }))
+  expectAssignable<Client>(new Client('', {
+    pipelining: 1
+  }))
+  expectAssignable<Client>(new Client('', {
+    strictContentLength: true
+  }))
+  expectAssignable<Client>(new Client('', {
+    maxCachedSessions: 1
+  }))
+  expectAssignable<Client>(new Client('', {
+    maxRedirections: 1
+  }))
+  expectAssignable<Client>(new Client('', {
+    maxRequestsPerClient: 1
+  }))
+  expectAssignable<Client>(new Client('', {
+    localAddress: '127.0.0.1'
+  }))
+  expectAssignable<Client>(new Client('', {
+    maxResponseSize: -1
+  }))
+  expectAssignable<Client>(new Client('', {
+    autoSelectFamily: true
+  }))
+  expectAssignable<Client>(new Client('', {
+    autoSelectFamilyAttemptTimeout: 300e3
+  }))
+}
+
 {
   const client = new Client('')
 
diff --git a/test/types/connector.test-d.ts b/test/types/connector.test-d.ts
index 1437d6f333d..bbf07e1d396 100644
--- a/test/types/connector.test-d.ts
+++ b/test/types/connector.test-d.ts
@@ -25,6 +25,8 @@ expectAssignable<Client>(new Client('', {
 expectAssignable<buildConnector.BuildOptions>({
   checkServerIdentity: () => undefined, // Test if ConnectionOptions is assignable
   localPort: 1234, // Test if TcpNetConnectOpts is assignable
+  keepAlive: true,
+  keepAliveInitialDelay: 12345,
 });
 
 expectAssignable<buildConnector.Options>({
diff --git a/test/types/dispatcher.test-d.ts b/test/types/dispatcher.test-d.ts
index 94c66ee3abc..2f31b91c987 100644
--- a/test/types/dispatcher.test-d.ts
+++ b/test/types/dispatcher.test-d.ts
@@ -1,3 +1,4 @@
+import { IncomingHttpHeaders } from 'http'
 import { Duplex, Readable, Writable } from 'stream'
 import { expectAssignable, expectType } from 'tsd'
 import { Dispatcher } from '../..'
@@ -9,11 +10,18 @@ expectAssignable<Dispatcher>(new Dispatcher())
 {
   const dispatcher = new Dispatcher()
 
+  const nodeCoreHeaders = {
+    authorization: undefined,
+    ['content-type']: 'application/json'
+  } satisfies IncomingHttpHeaders;
+
   // dispatch
   expectAssignable<boolean>(dispatcher.dispatch({ path: '', method: 'GET' }, {}))
   expectAssignable<boolean>(dispatcher.dispatch({ origin: '', path: '', method: 'GET' }, {}))
+  expectAssignable<boolean>(dispatcher.dispatch({ origin: '', path: '', method: 'GET', headers: { authorization: undefined } }, {}))
   expectAssignable<boolean>(dispatcher.dispatch({ origin: '', path: '', method: 'GET', headers: [] }, {}))
   expectAssignable<boolean>(dispatcher.dispatch({ origin: '', path: '', method: 'GET', headers: {} }, {}))
+  expectAssignable<boolean>(dispatcher.dispatch({ origin: '', path: '', method: 'GET', headers: nodeCoreHeaders }, {}))
   expectAssignable<boolean>(dispatcher.dispatch({ origin: '', path: '', method: 'GET', headers: null, reset: true }, {}))
   expectAssignable<boolean>(dispatcher.dispatch({ origin: new URL('http://localhost'), path: '', method: 'GET' }, {}))
 
diff --git a/test/types/errors.test-d.ts b/test/types/errors.test-d.ts
index 53b544dfcd1..8708519504b 100644
--- a/test/types/errors.test-d.ts
+++ b/test/types/errors.test-d.ts
@@ -4,29 +4,44 @@ import Client from '../../types/client'
 
 expectAssignable<errors.UndiciError>(new errors.UndiciError())
 
+expectAssignable<errors.UndiciError>(new errors.ConnectTimeoutError())
+expectAssignable<errors.ConnectTimeoutError>(new errors.ConnectTimeoutError())
+expectAssignable<'ConnectTimeoutError'>(new errors.ConnectTimeoutError().name)
+expectAssignable<'UND_ERR_CONNECT_TIMEOUT'>(new errors.ConnectTimeoutError().code)
+
 expectAssignable<errors.UndiciError>(new errors.HeadersTimeoutError())
 expectAssignable<errors.HeadersTimeoutError>(new errors.HeadersTimeoutError())
 expectAssignable<'HeadersTimeoutError'>(new errors.HeadersTimeoutError().name)
 expectAssignable<'UND_ERR_HEADERS_TIMEOUT'>(new errors.HeadersTimeoutError().code)
 
+expectAssignable<errors.UndiciError>(new errors.HeadersOverflowError())
+expectAssignable<errors.HeadersOverflowError>(new errors.HeadersOverflowError())
+expectAssignable<'HeadersOverflowError'>(new errors.HeadersOverflowError().name)
+expectAssignable<'UND_ERR_HEADERS_OVERFLOW'>(new errors.HeadersOverflowError().code)
+
 expectAssignable<errors.UndiciError>(new errors.BodyTimeoutError())
 expectAssignable<errors.BodyTimeoutError>(new errors.BodyTimeoutError())
 expectAssignable<'BodyTimeoutError'>(new errors.BodyTimeoutError().name)
 expectAssignable<'UND_ERR_BODY_TIMEOUT'>(new errors.BodyTimeoutError().code)
 
-expectAssignable<errors.UndiciError>(new errors.SocketTimeoutError())
-expectAssignable<errors.SocketTimeoutError>(new errors.SocketTimeoutError())
-expectAssignable<'SocketTimeoutError'>(new errors.SocketTimeoutError().name)
-expectAssignable<'UND_ERR_SOCKET_TIMEOUT'>(new errors.SocketTimeoutError().code)
+expectAssignable<errors.UndiciError>(new errors.ResponseStatusCodeError())
+expectAssignable<errors.ResponseStatusCodeError>(new errors.ResponseStatusCodeError())
+expectAssignable<'ResponseStatusCodeError'>(new errors.ResponseStatusCodeError().name)
+expectAssignable<'UND_ERR_RESPONSE_STATUS_CODE'>(new errors.ResponseStatusCodeError().code)
 
-expectAssignable<errors.UndiciError>(new errors.InvalidReturnError())
-expectAssignable<errors.InvalidReturnError>(new errors.InvalidReturnError())
-expectAssignable<'InvalidReturnError'>(new errors.InvalidReturnError().name)
-expectAssignable<'UND_ERR_INVALID_RETURN_VALUE'>(new errors.InvalidReturnError().code)
+expectAssignable<errors.UndiciError>(new errors.InvalidArgumentError())
+expectAssignable<errors.InvalidArgumentError>(new errors.InvalidArgumentError())
+expectAssignable<'InvalidArgumentError'>(new errors.InvalidArgumentError().name)
+expectAssignable<'UND_ERR_INVALID_ARG'>(new errors.InvalidArgumentError().code)
+
+expectAssignable<errors.UndiciError>(new errors.InvalidReturnValueError())
+expectAssignable<errors.InvalidReturnValueError>(new errors.InvalidReturnValueError())
+expectAssignable<'InvalidReturnValueError'>(new errors.InvalidReturnValueError().name)
+expectAssignable<'UND_ERR_INVALID_RETURN_VALUE'>(new errors.InvalidReturnValueError().code)
 
 expectAssignable<errors.UndiciError>(new errors.RequestAbortedError())
 expectAssignable<errors.RequestAbortedError>(new errors.RequestAbortedError())
-expectAssignable<'RequestAbortedError'>(new errors.RequestAbortedError().name)
+expectAssignable<'AbortError'>(new errors.RequestAbortedError().name)
 expectAssignable<'UND_ERR_ABORTED'>(new errors.RequestAbortedError().code)
 
 expectAssignable<errors.UndiciError>(new errors.InformationalError())
@@ -39,6 +54,11 @@ expectAssignable<errors.RequestContentLengthMismatchError>(new errors.RequestCon
 expectAssignable<'RequestContentLengthMismatchError'>(new errors.RequestContentLengthMismatchError().name)
 expectAssignable<'UND_ERR_REQ_CONTENT_LENGTH_MISMATCH'>(new errors.RequestContentLengthMismatchError().code)
 
+expectAssignable<errors.UndiciError>(new errors.ResponseContentLengthMismatchError())
+expectAssignable<errors.ResponseContentLengthMismatchError>(new errors.ResponseContentLengthMismatchError())
+expectAssignable<'ResponseContentLengthMismatchError'>(new errors.ResponseContentLengthMismatchError().name)
+expectAssignable<'UND_ERR_RES_CONTENT_LENGTH_MISMATCH'>(new errors.ResponseContentLengthMismatchError().code)
+
 expectAssignable<errors.UndiciError>(new errors.ClientDestroyedError())
 expectAssignable<errors.ClientDestroyedError>(new errors.ClientDestroyedError())
 expectAssignable<'ClientDestroyedError'>(new errors.ClientDestroyedError().name)
@@ -60,15 +80,29 @@ expectAssignable<errors.NotSupportedError>(new errors.NotSupportedError())
 expectAssignable<'NotSupportedError'>(new errors.NotSupportedError().name)
 expectAssignable<'UND_ERR_NOT_SUPPORTED'>(new errors.NotSupportedError().code)
 
+expectAssignable<errors.UndiciError>(new errors.BalancedPoolMissingUpstreamError())
+expectAssignable<errors.BalancedPoolMissingUpstreamError>(new errors.BalancedPoolMissingUpstreamError())
+expectAssignable<'MissingUpstreamError'>(new errors.BalancedPoolMissingUpstreamError().name)
+expectAssignable<'UND_ERR_BPL_MISSING_UPSTREAM'>(new errors.BalancedPoolMissingUpstreamError().code)
+
+expectAssignable<errors.UndiciError>(new errors.HTTPParserError())
+expectAssignable<errors.HTTPParserError>(new errors.HTTPParserError())
+expectAssignable<'HTTPParserError'>(new errors.HTTPParserError().name)
+
+expectAssignable<errors.UndiciError>(new errors.ResponseExceededMaxSizeError())
+expectAssignable<errors.ResponseExceededMaxSizeError>(new errors.ResponseExceededMaxSizeError())
+expectAssignable<'ResponseExceededMaxSizeError'>(new errors.ResponseExceededMaxSizeError().name)
+expectAssignable<'UND_ERR_RES_EXCEEDED_MAX_SIZE'>(new errors.ResponseExceededMaxSizeError().code)
+
 {
   // @ts-ignore
-  function f (): errors.HeadersTimeoutError | errors.SocketTimeoutError { return }
+  function f (): errors.HeadersTimeoutError | errors.ConnectTimeoutError { return }
 
   const e = f()
 
   if (e.code === 'UND_ERR_HEADERS_TIMEOUT') {
     expectAssignable<errors.HeadersTimeoutError>(e)
-  } else if (e.code === 'UND_ERR_SOCKET_TIMEOUT') {
-    expectAssignable<errors.SocketTimeoutError>(e)
+  } else if (e.code === 'UND_ERR_CONNECT_TIMEOUT') {
+    expectAssignable<errors.ConnectTimeoutError>(e)
   }
 }
diff --git a/test/types/fetch.test-d.ts b/test/types/fetch.test-d.ts
index a76d6d7043c..e11296aa85c 100644
--- a/test/types/fetch.test-d.ts
+++ b/test/types/fetch.test-d.ts
@@ -168,4 +168,6 @@ expectType<Response>(response.clone())
 
 expectType<Request>(new Request('https://example.com', { body: 'Hello, world', duplex: 'half' }))
 expectAssignable<RequestInit>({ duplex: 'half' })
-expectNotAssignable<RequestInit>({ duplex: 'not valid' })
\ No newline at end of file
+expectNotAssignable<RequestInit>({ duplex: 'not valid' })
+
+expectType<string[]>(headers.getSetCookie())
diff --git a/test/types/header.test-d.ts b/test/types/header.test-d.ts
new file mode 100644
index 00000000000..38ac9f6afdc
--- /dev/null
+++ b/test/types/header.test-d.ts
@@ -0,0 +1,16 @@
+import { IncomingHttpHeaders as CoreIncomingHttpHeaders } from "http";
+import { expectAssignable, expectNotAssignable } from "tsd";
+import { IncomingHttpHeaders } from "../../types/header";
+
+const headers = {
+  authorization: undefined,
+  ["content-type"]: "application/json",
+} satisfies CoreIncomingHttpHeaders;
+
+expectAssignable<IncomingHttpHeaders>(headers);
+
+// It is why we do not need to add ` | null` to `IncomingHttpHeaders`:
+expectNotAssignable<CoreIncomingHttpHeaders>({
+  authorization: null,
+  ["content-type"]: "application/json",
+});
diff --git a/test/types/proxy-agent.test-d.ts b/test/types/proxy-agent.test-d.ts
index a471750a2e5..7cc092ba4a8 100644
--- a/test/types/proxy-agent.test-d.ts
+++ b/test/types/proxy-agent.test-d.ts
@@ -1,6 +1,6 @@
 import { expectAssignable } from 'tsd'
 import { URL } from 'url'
-import { ProxyAgent, setGlobalDispatcher, getGlobalDispatcher, Agent } from '../..'
+import { ProxyAgent, setGlobalDispatcher, getGlobalDispatcher, Agent, Pool } from '../..'
 
 expectAssignable<ProxyAgent>(new ProxyAgent(''))
 expectAssignable<ProxyAgent>(new ProxyAgent({ uri: '' }))
@@ -25,7 +25,8 @@ expectAssignable<ProxyAgent>(
       cert: '',
       servername: '',
       timeout: 1
-    }
+    },
+    clientFactory: (origin: URL, opts: object) => new Pool(origin, opts)
   })
 )
 
diff --git a/test/util.js b/test/util.js
index cbc94d63ba0..48a21a1141f 100644
--- a/test/util.js
+++ b/test/util.js
@@ -96,7 +96,7 @@ test('parseRawHeaders', (t) => {
   t.same(util.parseRawHeaders(['key', 'value', Buffer.from('key'), Buffer.from('value')]), ['key', 'value', 'key', 'value'])
 })
 
-test('buildURL', { skip: process.version.startsWith('v12.') }, (t) => {
+test('buildURL', { skip: util.nodeMajor >= 12 }, (t) => {
   const tests = [
     [{ id: BigInt(123456) }, 'id=123456'],
     [{ date: new Date() }, 'date='],
diff --git a/test/wpt/runner/resources/testharness.cjs b/test/wpt/runner/resources/testharness.cjs
deleted file mode 100644
index c66cdb7cbb3..00000000000
--- a/test/wpt/runner/resources/testharness.cjs
+++ /dev/null
@@ -1,4909 +0,0 @@
-/*global self*/
-/*jshint latedef: nofunc*/
-
-/* Documentation: https://web-platform-tests.org/writing-tests/testharness-api.html
- * (../docs/_writing-tests/testharness-api.md) */
-
- (function (global_scope)
- {
-	 // default timeout is 10 seconds, test can override if needed
-	 var settings = {
-		 output:true,
-		 harness_timeout:{
-			 "normal":10000,
-			 "long":60000
-		 },
-		 test_timeout:null,
-		 message_events: ["start", "test_state", "result", "completion"],
-		 debug: false,
-	 };
- 
-	 var xhtml_ns = "http://www.w3.org/1999/xhtml";
- 
-	 /*
-	  * TestEnvironment is an abstraction for the environment in which the test
-	  * harness is used. Each implementation of a test environment has to provide
-	  * the following interface:
-	  *
-	  * interface TestEnvironment {
-	  *   // Invoked after the global 'tests' object has been created and it's
-	  *   // safe to call add_*_callback() to register event handlers.
-	  *   void on_tests_ready();
-	  *
-	  *   // Invoked after setup() has been called to notify the test environment
-	  *   // of changes to the test harness properties.
-	  *   void on_new_harness_properties(object properties);
-	  *
-	  *   // Should return a new unique default test name.
-	  *   DOMString next_default_test_name();
-	  *
-	  *   // Should return the test harness timeout duration in milliseconds.
-	  *   float test_timeout();
-	  * };
-	  */
- 
-	 /*
-	  * A test environment with a DOM. The global object is 'window'. By default
-	  * test results are displayed in a table. Any parent windows receive
-	  * callbacks or messages via postMessage() when test events occur. See
-	  * apisample11.html and apisample12.html.
-	  */
-	 function WindowTestEnvironment() {
-		 this.name_counter = 0;
-		 this.window_cache = null;
-		 this.output_handler = null;
-		 this.all_loaded = false;
-		 var this_obj = this;
-		 this.message_events = [];
-		 this.dispatched_messages = [];
- 
-		 this.message_functions = {
-			 start: [add_start_callback, remove_start_callback,
-					 function (properties) {
-						 this_obj._dispatch("start_callback", [properties],
-											{type: "start", properties: properties});
-					 }],
- 
-			 test_state: [add_test_state_callback, remove_test_state_callback,
-						  function(test) {
-							  this_obj._dispatch("test_state_callback", [test],
-												 {type: "test_state",
-												  test: test.structured_clone()});
-						  }],
-			 result: [add_result_callback, remove_result_callback,
-					  function (test) {
-						  this_obj.output_handler.show_status();
-						  this_obj._dispatch("result_callback", [test],
-											 {type: "result",
-											  test: test.structured_clone()});
-					  }],
-			 completion: [add_completion_callback, remove_completion_callback,
-						  function (tests, harness_status, asserts) {
-							  var cloned_tests = map(tests, function(test) {
-								  return test.structured_clone();
-							  });
-							  this_obj._dispatch("completion_callback", [tests, harness_status],
-												 {type: "complete",
-												  tests: cloned_tests,
-												  status: harness_status.structured_clone(),
-												  asserts: asserts.map(assert => assert.structured_clone())});
-						  }]
-		 }
- 
-		 on_event(window, 'load', function() {
-			 this_obj.all_loaded = true;
-		 });
- 
-		 on_event(window, 'message', function(event) {
-			 if (event.data && event.data.type === "getmessages" && event.source) {
-				 // A window can post "getmessages" to receive a duplicate of every
-				 // message posted by this environment so far. This allows subscribers
-				 // from fetch_tests_from_window to 'catch up' to the current state of
-				 // this environment.
-				 for (var i = 0; i < this_obj.dispatched_messages.length; ++i)
-				 {
-					 event.source.postMessage(this_obj.dispatched_messages[i], "*");
-				 }
-			 }
-		 });
-	 }
- 
-	 WindowTestEnvironment.prototype._dispatch = function(selector, callback_args, message_arg) {
-		 this.dispatched_messages.push(message_arg);
-		 this._forEach_windows(
-				 function(w, same_origin) {
-					 if (same_origin) {
-						 try {
-							 var has_selector = selector in w;
-						 } catch(e) {
-							 // If document.domain was set at some point same_origin can be
-							 // wrong and the above will fail.
-							 has_selector = false;
-						 }
-						 if (has_selector) {
-							 try {
-								 w[selector].apply(undefined, callback_args);
-							 } catch (e) {}
-						 }
-					 }
-					 if (w !== self) {
-						 w.postMessage(message_arg, "*");
-					 }
-				 });
-	 };
- 
-	 WindowTestEnvironment.prototype._forEach_windows = function(callback) {
-		 // Iterate over the windows [self ... top, opener]. The callback is passed
-		 // two objects, the first one is the window object itself, the second one
-		 // is a boolean indicating whether or not it's on the same origin as the
-		 // current window.
-		 var cache = this.window_cache;
-		 if (!cache) {
-			 cache = [[self, true]];
-			 var w = self;
-			 var i = 0;
-			 var so;
-			 while (w != w.parent) {
-				 w = w.parent;
-				 so = is_same_origin(w);
-				 cache.push([w, so]);
-				 i++;
-			 }
-			 w = window.opener;
-			 if (w) {
-				 cache.push([w, is_same_origin(w)]);
-			 }
-			 this.window_cache = cache;
-		 }
- 
-		 forEach(cache,
-				 function(a) {
-					 callback.apply(null, a);
-				 });
-	 };
- 
-	 WindowTestEnvironment.prototype.on_tests_ready = function() {
-		 var output = new Output();
-		 this.output_handler = output;
- 
-		 var this_obj = this;
- 
-		 add_start_callback(function (properties) {
-			 this_obj.output_handler.init(properties);
-		 });
- 
-		 add_test_state_callback(function(test) {
-			 this_obj.output_handler.show_status();
-		 });
- 
-		 add_result_callback(function (test) {
-			 this_obj.output_handler.show_status();
-		 });
- 
-		 add_completion_callback(function (tests, harness_status, asserts_run) {
-			 this_obj.output_handler.show_results(tests, harness_status, asserts_run);
-		 });
-		 this.setup_messages(settings.message_events);
-	 };
- 
-	 WindowTestEnvironment.prototype.setup_messages = function(new_events) {
-		 var this_obj = this;
-		 forEach(settings.message_events, function(x) {
-			 var current_dispatch = this_obj.message_events.indexOf(x) !== -1;
-			 var new_dispatch = new_events.indexOf(x) !== -1;
-			 if (!current_dispatch && new_dispatch) {
-				 this_obj.message_functions[x][0](this_obj.message_functions[x][2]);
-			 } else if (current_dispatch && !new_dispatch) {
-				 this_obj.message_functions[x][1](this_obj.message_functions[x][2]);
-			 }
-		 });
-		 this.message_events = new_events;
-	 }
- 
-	 WindowTestEnvironment.prototype.next_default_test_name = function() {
-		 var suffix = this.name_counter > 0 ? " " + this.name_counter : "";
-		 this.name_counter++;
-		 return get_title() + suffix;
-	 };
- 
-	 WindowTestEnvironment.prototype.on_new_harness_properties = function(properties) {
-		 this.output_handler.setup(properties);
-		 if (properties.hasOwnProperty("message_events")) {
-			 this.setup_messages(properties.message_events);
-		 }
-	 };
- 
-	 WindowTestEnvironment.prototype.add_on_loaded_callback = function(callback) {
-		 on_event(window, 'load', callback);
-	 };
- 
-	 WindowTestEnvironment.prototype.test_timeout = function() {
-		 var metas = document.getElementsByTagName("meta");
-		 for (var i = 0; i < metas.length; i++) {
-			 if (metas[i].name == "timeout") {
-				 if (metas[i].content == "long") {
-					 return settings.harness_timeout.long;
-				 }
-				 break;
-			 }
-		 }
-		 return settings.harness_timeout.normal;
-	 };
- 
-	 /*
-	  * Base TestEnvironment implementation for a generic web worker.
-	  *
-	  * Workers accumulate test results. One or more clients can connect and
-	  * retrieve results from a worker at any time.
-	  *
-	  * WorkerTestEnvironment supports communicating with a client via a
-	  * MessagePort.  The mechanism for determining the appropriate MessagePort
-	  * for communicating with a client depends on the type of worker and is
-	  * implemented by the various specializations of WorkerTestEnvironment
-	  * below.
-	  *
-	  * A client document using testharness can use fetch_tests_from_worker() to
-	  * retrieve results from a worker. See apisample16.html.
-	  */
-	 function WorkerTestEnvironment() {
-		 this.name_counter = 0;
-		 this.all_loaded = true;
-		 this.message_list = [];
-		 this.message_ports = [];
-	 }
- 
-	 WorkerTestEnvironment.prototype._dispatch = function(message) {
-		 this.message_list.push(message);
-		 for (var i = 0; i < this.message_ports.length; ++i)
-		 {
-			 this.message_ports[i].postMessage(message);
-		 }
-	 };
- 
-	 // The only requirement is that port has a postMessage() method. It doesn't
-	 // have to be an instance of a MessagePort, and often isn't.
-	 WorkerTestEnvironment.prototype._add_message_port = function(port) {
-		 this.message_ports.push(port);
-		 for (var i = 0; i < this.message_list.length; ++i)
-		 {
-			 port.postMessage(this.message_list[i]);
-		 }
-	 };
- 
-	 WorkerTestEnvironment.prototype.next_default_test_name = function() {
-		 var suffix = this.name_counter > 0 ? " " + this.name_counter : "";
-		 this.name_counter++;
-		 return get_title() + suffix;
-	 };
- 
-	 WorkerTestEnvironment.prototype.on_new_harness_properties = function() {};
- 
-	 WorkerTestEnvironment.prototype.on_tests_ready = function() {
-		 var this_obj = this;
-		 add_start_callback(
-				 function(properties) {
-					 this_obj._dispatch({
-						 type: "start",
-						 properties: properties,
-					 });
-				 });
-		 add_test_state_callback(
-				 function(test) {
-					 this_obj._dispatch({
-						 type: "test_state",
-						 test: test.structured_clone()
-					 });
-				 });
-		 add_result_callback(
-				 function(test) {
-					 this_obj._dispatch({
-						 type: "result",
-						 test: test.structured_clone()
-					 });
-				 });
-		 add_completion_callback(
-				 function(tests, harness_status, asserts) {
-					 this_obj._dispatch({
-						 type: "complete",
-						 tests: map(tests,
-							 function(test) {
-								 return test.structured_clone();
-							 }),
-						 status: harness_status.structured_clone(),
-						 asserts: asserts.map(assert => assert.structured_clone()),
-					 });
-				 });
-	 };
- 
-	 WorkerTestEnvironment.prototype.add_on_loaded_callback = function() {};
- 
-	 WorkerTestEnvironment.prototype.test_timeout = function() {
-		 // Tests running in a worker don't have a default timeout. I.e. all
-		 // worker tests behave as if settings.explicit_timeout is true.
-		 return null;
-	 };
- 
-	 /*
-	  * Dedicated web workers.
-	  * https://html.spec.whatwg.org/multipage/workers.html#dedicatedworkerglobalscope
-	  *
-	  * This class is used as the test_environment when testharness is running
-	  * inside a dedicated worker.
-	  */
-	 function DedicatedWorkerTestEnvironment() {
-		 WorkerTestEnvironment.call(this);
-		 // self is an instance of DedicatedWorkerGlobalScope which exposes
-		 // a postMessage() method for communicating via the message channel
-		 // established when the worker is created.
-		 this._add_message_port(self);
-	 }
-	 DedicatedWorkerTestEnvironment.prototype = Object.create(WorkerTestEnvironment.prototype);
- 
-	 DedicatedWorkerTestEnvironment.prototype.on_tests_ready = function() {
-		 WorkerTestEnvironment.prototype.on_tests_ready.call(this);
-		 // In the absence of an onload notification, we a require dedicated
-		 // workers to explicitly signal when the tests are done.
-		 tests.wait_for_finish = true;
-	 };
- 
-	 /*
-	  * Shared web workers.
-	  * https://html.spec.whatwg.org/multipage/workers.html#sharedworkerglobalscope
-	  *
-	  * This class is used as the test_environment when testharness is running
-	  * inside a shared web worker.
-	  */
-	 function SharedWorkerTestEnvironment() {
-		 WorkerTestEnvironment.call(this);
-		 var this_obj = this;
-		 // Shared workers receive message ports via the 'onconnect' event for
-		 // each connection.
-		 self.addEventListener("connect",
-				 function(message_event) {
-					 this_obj._add_message_port(message_event.source);
-				 }, false);
-	 }
-	 SharedWorkerTestEnvironment.prototype = Object.create(WorkerTestEnvironment.prototype);
- 
-	 SharedWorkerTestEnvironment.prototype.on_tests_ready = function() {
-		 WorkerTestEnvironment.prototype.on_tests_ready.call(this);
-		 // In the absence of an onload notification, we a require shared
-		 // workers to explicitly signal when the tests are done.
-		 tests.wait_for_finish = true;
-	 };
- 
-	 /*
-	  * Service workers.
-	  * http://www.w3.org/TR/service-workers/
-	  *
-	  * This class is used as the test_environment when testharness is running
-	  * inside a service worker.
-	  */
-	 function ServiceWorkerTestEnvironment() {
-		 WorkerTestEnvironment.call(this);
-		 this.all_loaded = false;
-		 this.on_loaded_callback = null;
-		 var this_obj = this;
-		 self.addEventListener("message",
-				 function(event) {
-					 if (event.data && event.data.type && event.data.type === "connect") {
-						 this_obj._add_message_port(event.source);
-					 }
-				 }, false);
- 
-		 // The oninstall event is received after the service worker script and
-		 // all imported scripts have been fetched and executed. It's the
-		 // equivalent of an onload event for a document. All tests should have
-		 // been added by the time this event is received, thus it's not
-		 // necessary to wait until the onactivate event. However, tests for
-		 // installed service workers need another event which is equivalent to
-		 // the onload event because oninstall is fired only on installation. The
-		 // onmessage event is used for that purpose since tests using
-		 // testharness.js should ask the result to its service worker by
-		 // PostMessage. If the onmessage event is triggered on the service
-		 // worker's context, that means the worker's script has been evaluated.
-		 on_event(self, "install", on_all_loaded);
-		 on_event(self, "message", on_all_loaded);
-		 function on_all_loaded() {
-			 if (this_obj.all_loaded)
-				 return;
-			 this_obj.all_loaded = true;
-			 if (this_obj.on_loaded_callback) {
-			   this_obj.on_loaded_callback();
-			 }
-		 }
-	 }
- 
-	 ServiceWorkerTestEnvironment.prototype = Object.create(WorkerTestEnvironment.prototype);
- 
-	 ServiceWorkerTestEnvironment.prototype.add_on_loaded_callback = function(callback) {
-		 if (this.all_loaded) {
-			 callback();
-		 } else {
-			 this.on_loaded_callback = callback;
-		 }
-	 };
- 
-	 /*
-	  * Shadow realms.
-	  * https://github.com/tc39/proposal-shadowrealm
-	  *
-	  * This class is used as the test_environment when testharness is running
-	  * inside a shadow realm.
-	  */
-	 function ShadowRealmTestEnvironment() {
-		 WorkerTestEnvironment.call(this);
-		 this.all_loaded = false;
-		 this.on_loaded_callback = null;
-	 }
- 
-	 ShadowRealmTestEnvironment.prototype = Object.create(WorkerTestEnvironment.prototype);
- 
-	 /**
-	  * Signal to the test environment that the tests are ready and the on-loaded
-	  * callback should be run.
-	  *
-	  * Shadow realms are not *really* a DOM context: they have no `onload` or similar
-	  * event for us to use to set up the test environment; so, instead, this method
-	  * is manually triggered from the incubating realm
-	  *
-	  * @param {Function} message_destination - a function that receives JSON-serializable
-	  * data to send to the incubating realm, in the same format as used by RemoteContext
-	  */
-	 ShadowRealmTestEnvironment.prototype.begin = function(message_destination) {
-		 if (this.all_loaded) {
-			 throw new Error("Tried to start a shadow realm test environment after it has already started");
-		 }
-		 var fakeMessagePort = {};
-		 fakeMessagePort.postMessage = message_destination;
-		 this._add_message_port(fakeMessagePort);
-		 this.all_loaded = true;
-		 if (this.on_loaded_callback) {
-			 this.on_loaded_callback();
-		 }
-	 };
- 
-	 ShadowRealmTestEnvironment.prototype.add_on_loaded_callback = function(callback) {
-		 if (this.all_loaded) {
-			 callback();
-		 } else {
-			 this.on_loaded_callback = callback;
-		 }
-	 };
- 
-	 /*
-	  * JavaScript shells.
-	  *
-	  * This class is used as the test_environment when testharness is running
-	  * inside a JavaScript shell.
-	  */
-	 function ShellTestEnvironment() {
-		 this.name_counter = 0;
-		 this.all_loaded = false;
-		 this.on_loaded_callback = null;
-		 Promise.resolve().then(function() {
-			 this.all_loaded = true
-			 if (this.on_loaded_callback) {
-				 this.on_loaded_callback();
-			 }
-		 }.bind(this));
-		 this.message_list = [];
-		 this.message_ports = [];
-	 }
- 
-	 ShellTestEnvironment.prototype.next_default_test_name = function() {
-		 var suffix = this.name_counter > 0 ? " " + this.name_counter : "";
-		 this.name_counter++;
-		 return "Untitled" + suffix;
-	 };
- 
-	 ShellTestEnvironment.prototype.on_new_harness_properties = function() {};
- 
-	 ShellTestEnvironment.prototype.on_tests_ready = function() {};
- 
-	 ShellTestEnvironment.prototype.add_on_loaded_callback = function(callback) {
-		 if (this.all_loaded) {
-			 callback();
-		 } else {
-			 this.on_loaded_callback = callback;
-		 }
-	 };
- 
-	 ShellTestEnvironment.prototype.test_timeout = function() {
-		 // Tests running in a shell don't have a default timeout, so behave as
-		 // if settings.explicit_timeout is true.
-		 return null;
-	 };
- 
-	 function create_test_environment() {
-		 if ('document' in global_scope) {
-			 return new WindowTestEnvironment();
-		 }
-		 if ('DedicatedWorkerGlobalScope' in global_scope &&
-			 global_scope instanceof DedicatedWorkerGlobalScope) {
-			 return new DedicatedWorkerTestEnvironment();
-		 }
-		 if ('SharedWorkerGlobalScope' in global_scope &&
-			 global_scope instanceof SharedWorkerGlobalScope) {
-			 return new SharedWorkerTestEnvironment();
-		 }
-		 if ('ServiceWorkerGlobalScope' in global_scope &&
-			 global_scope instanceof ServiceWorkerGlobalScope) {
-			 return new ServiceWorkerTestEnvironment();
-		 }
-		 if ('WorkerGlobalScope' in global_scope &&
-			 global_scope instanceof WorkerGlobalScope) {
-			 return new DedicatedWorkerTestEnvironment();
-		 }
-		 /* Shadow realm global objects are _ordinary_ objects (i.e. their prototype is
-		  * Object) so we don't have a nice `instanceof` test to use; instead, we
-		  * check if the there is a GLOBAL.isShadowRealm() property
-		  * on the global object. that was set by the test harness when it
-		  * created the ShadowRealm.
-		  */
-		 if (global_scope.GLOBAL && global_scope.GLOBAL.isShadowRealm()) {
-			 return new ShadowRealmTestEnvironment();
-		 }
- 
-		 return new ShellTestEnvironment();
-	 }
- 
-	 var test_environment = create_test_environment();
- 
-	 function is_shared_worker(worker) {
-		 return 'SharedWorker' in global_scope && worker instanceof SharedWorker;
-	 }
- 
-	 function is_service_worker(worker) {
-		 // The worker object may be from another execution context,
-		 // so do not use instanceof here.
-		 return 'ServiceWorker' in global_scope &&
-			 Object.prototype.toString.call(worker) == '[object ServiceWorker]';
-	 }
- 
-	 var seen_func_name = Object.create(null);
- 
-	 function get_test_name(func, name)
-	 {
-		 if (name) {
-			 return name;
-		 }
- 
-		 if (func) {
-			 var func_code = func.toString();
- 
-			 // Try and match with brackets, but fallback to matching without
-			 var arrow = func_code.match(/^\(\)\s*=>\s*(?:{(.*)}\s*|(.*))$/);
- 
-			 // Check for JS line separators
-			 if (arrow !== null && !/[\u000A\u000D\u2028\u2029]/.test(func_code)) {
-				 var trimmed = (arrow[1] !== undefined ? arrow[1] : arrow[2]).trim();
-				 // drop trailing ; if there's no earlier ones
-				 trimmed = trimmed.replace(/^([^;]*)(;\s*)+$/, "$1");
- 
-				 if (trimmed) {
-					 let name = trimmed;
-					 if (seen_func_name[trimmed]) {
-						 // This subtest name already exists, so add a suffix.
-						 name += " " + seen_func_name[trimmed];
-					 } else {
-						 seen_func_name[trimmed] = 0;
-					 }
-					 seen_func_name[trimmed] += 1;
-					 return name;
-				 }
-			 }
-		 }
- 
-		 return test_environment.next_default_test_name();
-	 }
- 
-	 /**
-	  * @callback TestFunction
-	  * @param {Test} test - The test currnetly being run.
-	  * @param {Any[]} args - Additional args to pass to function.
-	  *
-	  */
- 
-	 /**
-	  * Create a synchronous test
-	  *
-	  * @param {TestFunction} func - Test function. This is executed
-	  * immediately. If it returns without error, the test status is
-	  * set to ``PASS``. If it throws an :js:class:`AssertionError`, or
-	  * any other exception, the test status is set to ``FAIL``
-	  * (typically from an `assert` function).
-	  * @param {String} name - Test name. This must be unique in a
-	  * given file and must be invariant between runs.
-	  */
-	 function test(func, name, properties)
-	 {
-		 if (tests.promise_setup_called) {
-			 tests.status.status = tests.status.ERROR;
-			 tests.status.message = '`test` invoked after `promise_setup`';
-			 tests.complete();
-		 }
-		 var test_name = get_test_name(func, name);
-		 var test_obj = new Test(test_name, properties);
-		 var value = test_obj.step(func, test_obj, test_obj);
- 
-		 if (value !== undefined) {
-			 var msg = 'Test named "' + test_name +
-				 '" passed a function to `test` that returned a value.';
- 
-			 try {
-				 if (value && typeof value.then === 'function') {
-					 msg += ' Consider using `promise_test` instead when ' +
-						 'using Promises or async/await.';
-				 }
-			 } catch (err) {}
- 
-			 tests.status.status = tests.status.ERROR;
-			 tests.status.message = msg;
-		 }
- 
-		 if (test_obj.phase === test_obj.phases.STARTED) {
-			 test_obj.done();
-		 }
-	 }
- 
-	 /**
-	  * Create an asynchronous test
-	  *
-	  * @param {TestFunction|string} funcOrName - Initial step function
-	  * to call immediately with the test name as an argument (if any),
-	  * or name of the test.
-	  * @param {String} name - Test name (if a test function was
-	  * provided). This must be unique in a given file and must be
-	  * invariant between runs.
-	  * @returns {Test} An object representing the ongoing test.
-	  */
-	 function async_test(func, name, properties)
-	 {
-		 if (tests.promise_setup_called) {
-			 tests.status.status = tests.status.ERROR;
-			 tests.status.message = '`async_test` invoked after `promise_setup`';
-			 tests.complete();
-		 }
-		 if (typeof func !== "function") {
-			 properties = name;
-			 name = func;
-			 func = null;
-		 }
-		 var test_name = get_test_name(func, name);
-		 var test_obj = new Test(test_name, properties);
-		 if (func) {
-			 var value = test_obj.step(func, test_obj, test_obj);
- 
-			 // Test authors sometimes return values to async_test, expecting us
-			 // to handle the value somehow. Make doing so a harness error to be
-			 // clear this is invalid, and point authors to promise_test if it
-			 // may be appropriate.
-			 //
-			 // Note that we only perform this check on the initial function
-			 // passed to async_test, not on any later steps - we haven't seen a
-			 // consistent problem with those (and it's harder to check).
-			 if (value !== undefined) {
-				 var msg = 'Test named "' + test_name +
-					 '" passed a function to `async_test` that returned a value.';
- 
-				 try {
-					 if (value && typeof value.then === 'function') {
-						 msg += ' Consider using `promise_test` instead when ' +
-							 'using Promises or async/await.';
-					 }
-				 } catch (err) {}
- 
-				 tests.set_status(tests.status.ERROR, msg);
-				 tests.complete();
-			 }
-		 }
-		 return test_obj;
-	 }
- 
-	 /**
-	  * Create a promise test.
-	  *
-	  * Promise tests are tests which are represented by a promise
-	  * object. If the promise is fulfilled the test passes, if it's
-	  * rejected the test fails, otherwise the test passes.
-	  *
-	  * @param {TestFunction} func - Test function. This must return a
-	  * promise. The test is automatically marked as complete once the
-	  * promise settles.
-	  * @param {String} name - Test name. This must be unique in a
-	  * given file and must be invariant between runs.
-	  */
-	 function promise_test(func, name, properties) {
-		 if (typeof func !== "function") {
-			 properties = name;
-			 name = func;
-			 func = null;
-		 }
-		 var test_name = get_test_name(func, name);
-		 var test = new Test(test_name, properties);
-		 test._is_promise_test = true;
- 
-		 // If there is no promise tests queue make one.
-		 if (!tests.promise_tests) {
-			 tests.promise_tests = Promise.resolve();
-		 }
-		 tests.promise_tests = tests.promise_tests.then(function() {
-			 return new Promise(function(resolve) {
-				 var promise = test.step(func, test, test);
- 
-				 test.step(function() {
-					 assert(!!promise, "promise_test", null,
-							"test body must return a 'thenable' object (received ${value})",
-							{value:promise});
-					 assert(typeof promise.then === "function", "promise_test", null,
-							"test body must return a 'thenable' object (received an object with no `then` method)",
-							null);
-				 });
- 
-				 // Test authors may use the `step` method within a
-				 // `promise_test` even though this reflects a mixture of
-				 // asynchronous control flow paradigms. The "done" callback
-				 // should be registered prior to the resolution of the
-				 // user-provided Promise to avoid timeouts in cases where the
-				 // Promise does not settle but a `step` function has thrown an
-				 // error.
-				 add_test_done_callback(test, resolve);
- 
-				 Promise.resolve(promise)
-					 .catch(test.step_func(
-						 function(value) {
-							 if (value instanceof AssertionError) {
-								 throw value;
-							 }
-							 assert(false, "promise_test", null,
-									"Unhandled rejection with value: ${value}", {value:value});
-						 }))
-					 .then(function() {
-						 test.done();
-					 });
-				 });
-		 });
-	 }
- 
-	 /**
-	  * Make a copy of a Promise in the current realm.
-	  *
-	  * @param {Promise} promise the given promise that may be from a different
-	  *                          realm
-	  * @returns {Promise}
-	  *
-	  * An arbitrary promise provided by the caller may have originated
-	  * in another frame that have since navigated away, rendering the
-	  * frame's document inactive. Such a promise cannot be used with
-	  * `await` or Promise.resolve(), as microtasks associated with it
-	  * may be prevented from being run. See `issue
-	  * 5319<https://github.com/whatwg/html/issues/5319>`_ for a
-	  * particular case.
-	  *
-	  * In functions we define here, there is an expectation from the caller
-	  * that the promise is from the current realm, that can always be used with
-	  * `await`, etc. We therefore create a new promise in this realm that
-	  * inherit the value and status from the given promise.
-	  */
- 
-	 function bring_promise_to_current_realm(promise) {
-		 return new Promise(promise.then.bind(promise));
-	 }
- 
-	 /**
-	  * Assert that a Promise is rejected with the right ECMAScript exception.
-	  *
-	  * @param {Test} test - the `Test` to use for the assertion.
-	  * @param {Function} constructor - The expected exception constructor.
-	  * @param {Promise} promise - The promise that's expected to
-	  * reject with the given exception.
-	  * @param {string} [description] Error message to add to assert in case of
-	  *                               failure.
-	  */
-	 function promise_rejects_js(test, constructor, promise, description) {
-		 return bring_promise_to_current_realm(promise)
-			 .then(test.unreached_func("Should have rejected: " + description))
-			 .catch(function(e) {
-				 assert_throws_js_impl(constructor, function() { throw e },
-									   description, "promise_rejects_js");
-			 });
-	 }
- 
-	 /**
-	  * Assert that a Promise is rejected with the right DOMException.
-	  *
-	  * For the remaining arguments, there are two ways of calling
-	  * promise_rejects_dom:
-	  *
-	  * 1) If the DOMException is expected to come from the current global, the
-	  * third argument should be the promise expected to reject, and a fourth,
-	  * optional, argument is the assertion description.
-	  *
-	  * 2) If the DOMException is expected to come from some other global, the
-	  * third argument should be the DOMException constructor from that global,
-	  * the fourth argument the promise expected to reject, and the fifth,
-	  * optional, argument the assertion description.
-	  *
-	  * @param {Test} test - the `Test` to use for the assertion.
-	  * @param {number|string} type - See documentation for
-	  * `assert_throws_dom <#assert_throws_dom>`_.
-	  * @param {Function} promiseOrConstructor - Either the constructor
-	  * for the expected exception (if the exception comes from another
-	  * global), or the promise that's expected to reject (if the
-	  * exception comes from the current global).
-	  * @param {Function|string} descriptionOrPromise - Either the
-	  * promise that's expected to reject (if the exception comes from
-	  * another global), or the optional description of the condition
-	  * being tested (if the exception comes from the current global).
-	  * @param {string} [description] - Description of the condition
-	  * being tested (if the exception comes from another global).
-	  *
-	  */
-	 function promise_rejects_dom(test, type, promiseOrConstructor, descriptionOrPromise, maybeDescription) {
-		 let constructor, promise, description;
-		 if (typeof promiseOrConstructor === "function" &&
-			 promiseOrConstructor.name === "DOMException") {
-			 constructor = promiseOrConstructor;
-			 promise = descriptionOrPromise;
-			 description = maybeDescription;
-		 } else {
-			 constructor = self.DOMException;
-			 promise = promiseOrConstructor;
-			 description = descriptionOrPromise;
-			 assert(maybeDescription === undefined,
-					"Too many args pased to no-constructor version of promise_rejects_dom");
-		 }
-		 return bring_promise_to_current_realm(promise)
-			 .then(test.unreached_func("Should have rejected: " + description))
-			 .catch(function(e) {
-				 assert_throws_dom_impl(type, function() { throw e }, description,
-										"promise_rejects_dom", constructor);
-			 });
-	 }
- 
-	 /**
-	  * Assert that a Promise is rejected with the provided value.
-	  *
-	  * @param {Test} test - the `Test` to use for the assertion.
-	  * @param {Any} exception - The expected value of the rejected promise.
-	  * @param {Promise} promise - The promise that's expected to
-	  * reject.
-	  * @param {string} [description] Error message to add to assert in case of
-	  *                               failure.
-	  */
-	 function promise_rejects_exactly(test, exception, promise, description) {
-		 return bring_promise_to_current_realm(promise)
-			 .then(test.unreached_func("Should have rejected: " + description))
-			 .catch(function(e) {
-				 assert_throws_exactly_impl(exception, function() { throw e },
-											description, "promise_rejects_exactly");
-			 });
-	 }
- 
-	 /**
-	  * Allow DOM events to be handled using Promises.
-	  *
-	  * This can make it a lot easier to test a very specific series of events,
-	  * including ensuring that unexpected events are not fired at any point.
-	  *
-	  * `EventWatcher` will assert if an event occurs while there is no `wait_for`
-	  * created Promise waiting to be fulfilled, or if the event is of a different type
-	  * to the type currently expected. This ensures that only the events that are
-	  * expected occur, in the correct order, and with the correct timing.
-	  *
-	  * @constructor
-	  * @param {Test} test - The `Test` to use for the assertion.
-	  * @param {EventTarget} watchedNode - The target expected to receive the events.
-	  * @param {string[]} eventTypes - List of events to watch for.
-	  * @param {Promise} timeoutPromise - Promise that will cause the
-	  * test to be set to `TIMEOUT` once fulfilled.
-	  *
-	  */
-	 function EventWatcher(test, watchedNode, eventTypes, timeoutPromise)
-	 {
-		 if (typeof eventTypes == 'string') {
-			 eventTypes = [eventTypes];
-		 }
- 
-		 var waitingFor = null;
- 
-		 // This is null unless we are recording all events, in which case it
-		 // will be an Array object.
-		 var recordedEvents = null;
- 
-		 var eventHandler = test.step_func(function(evt) {
-			 assert_true(!!waitingFor,
-						 'Not expecting event, but got ' + evt.type + ' event');
-			 assert_equals(evt.type, waitingFor.types[0],
-						   'Expected ' + waitingFor.types[0] + ' event, but got ' +
-						   evt.type + ' event instead');
- 
-			 if (Array.isArray(recordedEvents)) {
-				 recordedEvents.push(evt);
-			 }
- 
-			 if (waitingFor.types.length > 1) {
-				 // Pop first event from array
-				 waitingFor.types.shift();
-				 return;
-			 }
-			 // We need to null out waitingFor before calling the resolve function
-			 // since the Promise's resolve handlers may call wait_for() which will
-			 // need to set waitingFor.
-			 var resolveFunc = waitingFor.resolve;
-			 waitingFor = null;
-			 // Likewise, we should reset the state of recordedEvents.
-			 var result = recordedEvents || evt;
-			 recordedEvents = null;
-			 resolveFunc(result);
-		 });
- 
-		 for (var i = 0; i < eventTypes.length; i++) {
-			 watchedNode.addEventListener(eventTypes[i], eventHandler, false);
-		 }
- 
-		 /**
-		  * Returns a Promise that will resolve after the specified event or
-		  * series of events has occurred.
-		  *
-		  * @param {Object} options An optional options object. If the 'record' property
-		  *                 on this object has the value 'all', when the Promise
-		  *                 returned by this function is resolved,  *all* Event
-		  *                 objects that were waited for will be returned as an
-		  *                 array.
-		  *
-		  * @example
-		  * const watcher = new EventWatcher(t, div, [ 'animationstart',
-		  *                                            'animationiteration',
-		  *                                            'animationend' ]);
-		  * return watcher.wait_for([ 'animationstart', 'animationend' ],
-		  *                         { record: 'all' }).then(evts => {
-		  *   assert_equals(evts[0].elapsedTime, 0.0);
-		  *   assert_equals(evts[1].elapsedTime, 2.0);
-		  * });
-		  */
-		 this.wait_for = function(types, options) {
-			 if (waitingFor) {
-				 return Promise.reject('Already waiting for an event or events');
-			 }
-			 if (typeof types == 'string') {
-				 types = [types];
-			 }
-			 if (options && options.record && options.record === 'all') {
-				 recordedEvents = [];
-			 }
-			 return new Promise(function(resolve, reject) {
-				 var timeout = test.step_func(function() {
-					 // If the timeout fires after the events have been received
-					 // or during a subsequent call to wait_for, ignore it.
-					 if (!waitingFor || waitingFor.resolve !== resolve)
-						 return;
- 
-					 // This should always fail, otherwise we should have
-					 // resolved the promise.
-					 assert_true(waitingFor.types.length == 0,
-								 'Timed out waiting for ' + waitingFor.types.join(', '));
-					 var result = recordedEvents;
-					 recordedEvents = null;
-					 var resolveFunc = waitingFor.resolve;
-					 waitingFor = null;
-					 resolveFunc(result);
-				 });
- 
-				 if (timeoutPromise) {
-					 timeoutPromise().then(timeout);
-				 }
- 
-				 waitingFor = {
-					 types: types,
-					 resolve: resolve,
-					 reject: reject
-				 };
-			 });
-		 };
- 
-		 /**
-		  * Stop listening for events
-		  */
-		 function stop_watching() {
-			 for (var i = 0; i < eventTypes.length; i++) {
-				 watchedNode.removeEventListener(eventTypes[i], eventHandler, false);
-			 }
-		 };
- 
-		 test._add_cleanup(stop_watching);
- 
-		 return this;
-	 }
-	 expose(EventWatcher, 'EventWatcher');
- 
-	 /**
-	  * @typedef {Object} SettingsObject
-	  * @property {bool} single_test - Use the single-page-test
-	  * mode. In this mode the Document represents a single
-	  * `async_test`. Asserts may be used directly without requiring
-	  * `Test.step` or similar wrappers, and any exceptions set the
-	  * status of the test rather than the status of the harness.
-	  * @property {bool} allow_uncaught_exception - don't treat an
-	  * uncaught exception as an error; needed when e.g. testing the
-	  * `window.onerror` handler.
-	  * @property {boolean} explicit_done - Wait for a call to `done()`
-	  * before declaring all tests complete (this is always true for
-	  * single-page tests).
-	  * @property hide_test_state - hide the test state output while
-	  * the test is running; This is helpful when the output of the test state
-	  * may interfere the test results.
-	  * @property {bool} explicit_timeout - disable file timeout; only
-	  * stop waiting for results when the `timeout()` function is
-	  * called This should typically only be set for manual tests, or
-	  * by a test runner that providees its own timeout mechanism.
-	  * @property {number} timeout_multiplier - Multiplier to apply to
-	  * per-test timeouts. This should only be set by a test runner.
-	  * @property {Document} output_document - The document to which
-	  * results should be logged. By default this is the current
-	  * document but could be an ancestor document in some cases e.g. a
-	  * SVG test loaded in an HTML wrapper
-	  *
-	  */
- 
-	 /**
-	  * Configure the harness
-	  *
-	  * @param {Function|SettingsObject} funcOrProperties - Either a
-	  * setup function to run, or a set of properties. If this is a
-	  * function that function is run synchronously. Any exception in
-	  * the function will set the overall harness status to `ERROR`.
-	  * @param {SettingsObject} maybeProperties - An object containing
-	  * the settings to use, if the first argument is a function.
-	  *
-	  */
-	 function setup(func_or_properties, maybe_properties)
-	 {
-		 var func = null;
-		 var properties = {};
-		 if (arguments.length === 2) {
-			 func = func_or_properties;
-			 properties = maybe_properties;
-		 } else if (func_or_properties instanceof Function) {
-			 func = func_or_properties;
-		 } else {
-			 properties = func_or_properties;
-		 }
-		 tests.setup(func, properties);
-		 test_environment.on_new_harness_properties(properties);
-	 }
- 
-	 /**
-	  * Configure the harness, waiting for a promise to resolve
-	  * before running any `promise_test` tests.
-	  *
-	  * @param {Function} func - Function returning a promise that's
-	  * run synchronously. Promise tests are not run until after this
-	  * function has resolved.
-	  * @param {SettingsObject} [properties] - An object containing
-	  * the harness settings to use.
-	  *
-	  */
-	 function promise_setup(func, properties={})
-	 {
-		 if (typeof func !== "function") {
-			 tests.set_status(tests.status.ERROR,
-							  "promise_test invoked without a function");
-			 tests.complete();
-			 return;
-		 }
-		 tests.promise_setup_called = true;
- 
-		 if (!tests.promise_tests) {
-			 tests.promise_tests = Promise.resolve();
-		 }
- 
-		 tests.promise_tests = tests.promise_tests
-			 .then(function()
-				   {
-					   var result;
- 
-					   tests.setup(null, properties);
-					   result = func();
-					   test_environment.on_new_harness_properties(properties);
- 
-					   if (!result || typeof result.then !== "function") {
-						   throw "Non-thenable returned by function passed to `promise_setup`";
-					   }
-					   return result;
-				   })
-			 .catch(function(e)
-					{
-						tests.set_status(tests.status.ERROR,
-										 String(e),
-										 e && e.stack);
-						tests.complete();
-					});
-	 }
- 
-	 /**
-	  * Mark test loading as complete.
-	  *
-	  * Typically this function is called implicitly on page load; it's
-	  * only necessary for users to call this when either the
-	  * ``explict_done`` or ``single_page`` properties have been set
-	  * via the :js:func:`setup` function.
-	  *
-	  * For single page tests this marks the test as complete and sets its status.
-	  * For other tests, this marks test loading as complete, but doesn't affect ongoing tests.
-	  */
-	 function done() {
-		 if (tests.tests.length === 0) {
-			 // `done` is invoked after handling uncaught exceptions, so if the
-			 // harness status is already set, the corresponding message is more
-			 // descriptive than the generic message defined here.
-			 if (tests.status.status === null) {
-				 tests.status.status = tests.status.ERROR;
-				 tests.status.message = "done() was called without first defining any tests";
-			 }
- 
-			 tests.complete();
-			 return;
-		 }
-		 if (tests.file_is_test) {
-			 // file is test files never have asynchronous cleanup logic,
-			 // meaning the fully-synchronous `done` function can be used here.
-			 tests.tests[0].done();
-		 }
-		 tests.end_wait();
-	 }
- 
-	 /**
-	  * @deprecated generate a list of tests from a function and list of arguments
-	  *
-	  * This is deprecated because it runs all the tests outside of the test functions
-	  * and as a result any test throwing an exception will result in no tests being
-	  * run. In almost all cases, you should simply call test within the loop you would
-	  * use to generate the parameter list array.
-	  *
-	  * @param {Function} func - The function that will be called for each generated tests.
-	  * @param {Any[][]} args - An array of arrays. Each nested array
-	  * has the structure `[testName, ...testArgs]`. For each of these nested arrays
-	  * array, a test is generated with name `testName` and test function equivalent to
-	  * `func(..testArgs)`.
-	  */
-	 function generate_tests(func, args, properties) {
-		 forEach(args, function(x, i)
-				 {
-					 var name = x[0];
-					 test(function()
-						  {
-							  func.apply(this, x.slice(1));
-						  },
-						  name,
-						  Array.isArray(properties) ? properties[i] : properties);
-				 });
-	 }
- 
-	 /**
-	  * @deprecated
-	  *
-	  * Register a function as a DOM event listener to the
-	  * given object for the event bubbling phase.
-	  *
-	  * @param {EventTarget} object - Event target
-	  * @param {string} event - Event name
-	  * @param {Function} callback - Event handler.
-	  */
-	 function on_event(object, event, callback)
-	 {
-		 object.addEventListener(event, callback, false);
-	 }
- 
-	 /**
-	  * Global version of :js:func:`Test.step_timeout` for use in single page tests.
-	  *
-	  * @param {Function} func - Function to run after the timeout
-	  * @param {number} timeout - Time in ms to wait before running the
-	  * test step. The actual wait time is ``timeout`` x
-	  * ``timeout_multiplier``.
-	  */
-	 function step_timeout(func, timeout) {
-		 var outer_this = this;
-		 var args = Array.prototype.slice.call(arguments, 2);
-		 return setTimeout(function() {
-			 func.apply(outer_this, args);
-		 }, timeout * tests.timeout_multiplier);
-	 }
- 
-	 expose(test, 'test');
-	 expose(async_test, 'async_test');
-	 expose(promise_test, 'promise_test');
-	 expose(promise_rejects_js, 'promise_rejects_js');
-	 expose(promise_rejects_dom, 'promise_rejects_dom');
-	 expose(promise_rejects_exactly, 'promise_rejects_exactly');
-	 expose(generate_tests, 'generate_tests');
-	 expose(setup, 'setup');
-	 expose(promise_setup, 'promise_setup');
-	 expose(done, 'done');
-	 expose(on_event, 'on_event');
-	 expose(step_timeout, 'step_timeout');
- 
-	 /*
-	  * Return a string truncated to the given length, with ... added at the end
-	  * if it was longer.
-	  */
-	 function truncate(s, len)
-	 {
-		 if (s.length > len) {
-			 return s.substring(0, len - 3) + "...";
-		 }
-		 return s;
-	 }
- 
-	 /*
-	  * Return true if object is probably a Node object.
-	  */
-	 function is_node(object)
-	 {
-		 // I use duck-typing instead of instanceof, because
-		 // instanceof doesn't work if the node is from another window (like an
-		 // iframe's contentWindow):
-		 // http://www.w3.org/Bugs/Public/show_bug.cgi?id=12295
-		 try {
-			 var has_node_properties = ("nodeType" in object &&
-										"nodeName" in object &&
-										"nodeValue" in object &&
-										"childNodes" in object);
-		 } catch (e) {
-			 // We're probably cross-origin, which means we aren't a node
-			 return false;
-		 }
- 
-		 if (has_node_properties) {
-			 try {
-				 object.nodeType;
-			 } catch (e) {
-				 // The object is probably Node.prototype or another prototype
-				 // object that inherits from it, and not a Node instance.
-				 return false;
-			 }
-			 return true;
-		 }
-		 return false;
-	 }
- 
-	 var replacements = {
-		 "0": "0",
-		 "1": "x01",
-		 "2": "x02",
-		 "3": "x03",
-		 "4": "x04",
-		 "5": "x05",
-		 "6": "x06",
-		 "7": "x07",
-		 "8": "b",
-		 "9": "t",
-		 "10": "n",
-		 "11": "v",
-		 "12": "f",
-		 "13": "r",
-		 "14": "x0e",
-		 "15": "x0f",
-		 "16": "x10",
-		 "17": "x11",
-		 "18": "x12",
-		 "19": "x13",
-		 "20": "x14",
-		 "21": "x15",
-		 "22": "x16",
-		 "23": "x17",
-		 "24": "x18",
-		 "25": "x19",
-		 "26": "x1a",
-		 "27": "x1b",
-		 "28": "x1c",
-		 "29": "x1d",
-		 "30": "x1e",
-		 "31": "x1f",
-		 "0xfffd": "ufffd",
-		 "0xfffe": "ufffe",
-		 "0xffff": "uffff",
-	 };
- 
-	 /**
-	  * Convert a value to a nice, human-readable string
-	  *
-	  * When many JavaScript Object values are coerced to a String, the
-	  * resulting value will be ``"[object Object]"``. This obscures
-	  * helpful information, making the coerced value unsuitable for
-	  * use in assertion messages, test names, and debugging
-	  * statements. `format_value` produces more distinctive string
-	  * representations of many kinds of objects, including arrays and
-	  * the more important DOM Node types. It also translates String
-	  * values containing control characters to include human-readable
-	  * representations.
-	  *
-	  * @example
-	  * // "Document node with 2 children"
-	  * format_value(document);
-	  * @example
-	  * // "\"foo\\uffffbar\""
-	  * format_value("foo\uffffbar");
-	  * @example
-	  * // "[-0, Infinity]"
-	  * format_value([-0, Infinity]);
-	  * @param {Any} val - The value to convert to a string.
-	  * @returns {string} - A string representation of ``val``, optimised for human readability.
-	  */
-	 function format_value(val, seen)
-	 {
-		 if (!seen) {
-			 seen = [];
-		 }
-		 if (typeof val === "object" && val !== null) {
-			 if (seen.indexOf(val) >= 0) {
-				 return "[...]";
-			 }
-			 seen.push(val);
-		 }
-		 if (Array.isArray(val)) {
-			 let output = "[";
-			 if (val.beginEllipsis !== undefined) {
-				 output += "…, ";
-			 }
-			 output += val.map(function(x) {return format_value(x, seen);}).join(", ");
-			 if (val.endEllipsis !== undefined) {
-				 output += ", …";
-			 }
-			 return output + "]";
-		 }
- 
-		 switch (typeof val) {
-		 case "string":
-			 val = val.replace(/\\/g, "\\\\");
-			 for (var p in replacements) {
-				 var replace = "\\" + replacements[p];
-				 val = val.replace(RegExp(String.fromCharCode(p), "g"), replace);
-			 }
-			 return '"' + val.replace(/"/g, '\\"') + '"';
-		 case "boolean":
-		 case "undefined":
-			 return String(val);
-		 case "number":
-			 // In JavaScript, -0 === 0 and String(-0) == "0", so we have to
-			 // special-case.
-			 if (val === -0 && 1/val === -Infinity) {
-				 return "-0";
-			 }
-			 return String(val);
-		 case "object":
-			 if (val === null) {
-				 return "null";
-			 }
- 
-			 // Special-case Node objects, since those come up a lot in my tests.  I
-			 // ignore namespaces.
-			 if (is_node(val)) {
-				 switch (val.nodeType) {
-				 case Node.ELEMENT_NODE:
-					 var ret = "<" + val.localName;
-					 for (var i = 0; i < val.attributes.length; i++) {
-						 ret += " " + val.attributes[i].name + '="' + val.attributes[i].value + '"';
-					 }
-					 ret += ">" + val.innerHTML + "</" + val.localName + ">";
-					 return "Element node " + truncate(ret, 60);
-				 case Node.TEXT_NODE:
-					 return 'Text node "' + truncate(val.data, 60) + '"';
-				 case Node.PROCESSING_INSTRUCTION_NODE:
-					 return "ProcessingInstruction node with target " + format_value(truncate(val.target, 60)) + " and data " + format_value(truncate(val.data, 60));
-				 case Node.COMMENT_NODE:
-					 return "Comment node <!--" + truncate(val.data, 60) + "-->";
-				 case Node.DOCUMENT_NODE:
-					 return "Document node with " + val.childNodes.length + (val.childNodes.length == 1 ? " child" : " children");
-				 case Node.DOCUMENT_TYPE_NODE:
-					 return "DocumentType node";
-				 case Node.DOCUMENT_FRAGMENT_NODE:
-					 return "DocumentFragment node with " + val.childNodes.length + (val.childNodes.length == 1 ? " child" : " children");
-				 default:
-					 return "Node object of unknown type";
-				 }
-			 }
- 
-		 /* falls through */
-		 default:
-			 try {
-				 return typeof val + ' "' + truncate(String(val), 1000) + '"';
-			 } catch(e) {
-				 return ("[stringifying object threw " + String(e) +
-						 " with type " + String(typeof e) + "]");
-			 }
-		 }
-	 }
-	 expose(format_value, "format_value");
- 
-	 /*
-	  * Assertions
-	  */
- 
-	 function expose_assert(f, name) {
-		 function assert_wrapper(...args) {
-			 let status = Test.statuses.TIMEOUT;
-			 let stack = null;
-			 try {
-				 if (settings.debug) {
-					 console.debug("ASSERT", name, tests.current_test && tests.current_test.name, args);
-				 }
-				 if (tests.output) {
-					 tests.set_assert(name, args);
-				 }
-				 const rv = f.apply(undefined, args);
-				 status = Test.statuses.PASS;
-				 return rv;
-			 } catch(e) {
-				 status = Test.statuses.FAIL;
-				 stack = e.stack ? e.stack : null;
-				 throw e;
-			 } finally {
-				 if (tests.output && !stack) {
-					 stack = get_stack();
-				 }
-				 if (tests.output) {
-					 tests.set_assert_status(status, stack);
-				 }
-			 }
-		 }
-		 expose(assert_wrapper, name);
-	 }
- 
-	 /**
-	  * Assert that ``actual`` is strictly true
-	  *
-	  * @param {Any} actual - Value that is asserted to be true
-	  * @param {string} [description] - Description of the condition being tested
-	  */
-	 function assert_true(actual, description)
-	 {
-		 assert(actual === true, "assert_true", description,
-								 "expected true got ${actual}", {actual:actual});
-	 }
-	 expose_assert(assert_true, "assert_true");
- 
-	 /**
-	  * Assert that ``actual`` is strictly false
-	  *
-	  * @param {Any} actual - Value that is asserted to be false
-	  * @param {string} [description] - Description of the condition being tested
-	  */
-	 function assert_false(actual, description)
-	 {
-		 assert(actual === false, "assert_false", description,
-								  "expected false got ${actual}", {actual:actual});
-	 }
-	 expose_assert(assert_false, "assert_false");
- 
-	 function same_value(x, y) {
-		 if (y !== y) {
-			 //NaN case
-			 return x !== x;
-		 }
-		 if (x === 0 && y === 0) {
-			 //Distinguish +0 and -0
-			 return 1/x === 1/y;
-		 }
-		 return x === y;
-	 }
- 
-	 /**
-	  * Assert that ``actual`` is the same value as ``expected``.
-	  *
-	  * For objects this compares by cobject identity; for primitives
-	  * this distinguishes between 0 and -0, and has correct handling
-	  * of NaN.
-	  *
-	  * @param {Any} actual - Test value.
-	  * @param {Any} expected - Expected value.
-	  * @param {string} [description] - Description of the condition being tested.
-	  */
-	 function assert_equals(actual, expected, description)
-	 {
-		  /*
-		   * Test if two primitives are equal or two objects
-		   * are the same object
-		   */
-		 if (typeof actual != typeof expected) {
-			 assert(false, "assert_equals", description,
-						   "expected (" + typeof expected + ") ${expected} but got (" + typeof actual + ") ${actual}",
-						   {expected:expected, actual:actual});
-			 return;
-		 }
-		 assert(same_value(actual, expected), "assert_equals", description,
-											  "expected ${expected} but got ${actual}",
-											  {expected:expected, actual:actual});
-	 }
-	 expose_assert(assert_equals, "assert_equals");
- 
-	 /**
-	  * Assert that ``actual`` is not the same value as ``expected``.
-	  *
-	  * Comparison is as for :js:func:`assert_equals`.
-	  *
-	  * @param {Any} actual - Test value.
-	  * @param {Any} expected - The value ``actual`` is expected to be different to.
-	  * @param {string} [description] - Description of the condition being tested.
-	  */
-	 function assert_not_equals(actual, expected, description)
-	 {
-		 assert(!same_value(actual, expected), "assert_not_equals", description,
-											   "got disallowed value ${actual}",
-											   {actual:actual});
-	 }
-	 expose_assert(assert_not_equals, "assert_not_equals");
- 
-	 /**
-	  * Assert that ``expected`` is an array and ``actual`` is one of the members.
-	  * This is implemented using ``indexOf``, so doesn't handle NaN or ±0 correctly.
-	  *
-	  * @param {Any} actual - Test value.
-	  * @param {Array} expected - An array that ``actual`` is expected to
-	  * be a member of.
-	  * @param {string} [description] - Description of the condition being tested.
-	  */
-	 function assert_in_array(actual, expected, description)
-	 {
-		 assert(expected.indexOf(actual) != -1, "assert_in_array", description,
-												"value ${actual} not in array ${expected}",
-												{actual:actual, expected:expected});
-	 }
-	 expose_assert(assert_in_array, "assert_in_array");
- 
-	 // This function was deprecated in July of 2015.
-	 // See https://github.com/web-platform-tests/wpt/issues/2033
-	 /**
-	  * @deprecated
-	  * Recursively compare two objects for equality.
-	  *
-	  * See `Issue 2033
-	  * <https://github.com/web-platform-tests/wpt/issues/2033>`_ for
-	  * more information.
-	  *
-	  * @param {Object} actual - Test value.
-	  * @param {Object} expected - Expected value.
-	  * @param {string} [description] - Description of the condition being tested.
-	  */
-	 function assert_object_equals(actual, expected, description)
-	 {
-		  assert(typeof actual === "object" && actual !== null, "assert_object_equals", description,
-																"value is ${actual}, expected object",
-																{actual: actual});
-		  //This needs to be improved a great deal
-		  function check_equal(actual, expected, stack)
-		  {
-			  stack.push(actual);
- 
-			  var p;
-			  for (p in actual) {
-				  assert(expected.hasOwnProperty(p), "assert_object_equals", description,
-													 "unexpected property ${p}", {p:p});
- 
-				  if (typeof actual[p] === "object" && actual[p] !== null) {
-					  if (stack.indexOf(actual[p]) === -1) {
-						  check_equal(actual[p], expected[p], stack);
-					  }
-				  } else {
-					  assert(same_value(actual[p], expected[p]), "assert_object_equals", description,
-														"property ${p} expected ${expected} got ${actual}",
-														{p:p, expected:expected[p], actual:actual[p]});
-				  }
-			  }
-			  for (p in expected) {
-				  assert(actual.hasOwnProperty(p),
-						 "assert_object_equals", description,
-						 "expected property ${p} missing", {p:p});
-			  }
-			  stack.pop();
-		  }
-		  check_equal(actual, expected, []);
-	 }
-	 expose_assert(assert_object_equals, "assert_object_equals");
- 
-	 /**
-	  * Assert that ``actual`` and ``expected`` are both arrays, and that the array properties of
-	  * ``actual`` and ``expected`` are all the same value (as for :js:func:`assert_equals`).
-	  *
-	  * @param {Array} actual - Test array.
-	  * @param {Array} expected - Array that is expected to contain the same values as ``actual``.
-	  * @param {string} [description] - Description of the condition being tested.
-	  */
-	 function assert_array_equals(actual, expected, description)
-	 {
-		 const max_array_length = 20;
-		 function shorten_array(arr, offset = 0) {
-			 // Make ", …" only show up when it would likely reduce the length, not accounting for
-			 // fonts.
-			 if (arr.length < max_array_length + 2) {
-				 return arr;
-			 }
-			 // By default we want half the elements after the offset and half before
-			 // But if that takes us past the end of the array, we have more before, and
-			 // if it takes us before the start we have more after.
-			 const length_after_offset = Math.floor(max_array_length / 2);
-			 let upper_bound = Math.min(length_after_offset + offset, arr.length);
-			 const lower_bound = Math.max(upper_bound - max_array_length, 0);
- 
-			 if (lower_bound === 0) {
-				 upper_bound = max_array_length;
-			 }
- 
-			 const output = arr.slice(lower_bound, upper_bound);
-			 if (lower_bound > 0) {
-				 output.beginEllipsis = true;
-			 }
-			 if (upper_bound < arr.length) {
-				 output.endEllipsis = true;
-			 }
-			 return output;
-		 }
- 
-		 assert(typeof actual === "object" && actual !== null && "length" in actual,
-				"assert_array_equals", description,
-				"value is ${actual}, expected array",
-				{actual:actual});
-		 assert(actual.length === expected.length,
-				"assert_array_equals", description,
-				"lengths differ, expected array ${expected} length ${expectedLength}, got ${actual} length ${actualLength}",
-				{expected:shorten_array(expected, expected.length - 1), expectedLength:expected.length,
-				 actual:shorten_array(actual, actual.length - 1), actualLength:actual.length
-				});
- 
-		 for (var i = 0; i < actual.length; i++) {
-			 assert(actual.hasOwnProperty(i) === expected.hasOwnProperty(i),
-					"assert_array_equals", description,
-					"expected property ${i} to be ${expected} but was ${actual} (expected array ${arrayExpected} got ${arrayActual})",
-					{i:i, expected:expected.hasOwnProperty(i) ? "present" : "missing",
-					 actual:actual.hasOwnProperty(i) ? "present" : "missing",
-					 arrayExpected:shorten_array(expected, i), arrayActual:shorten_array(actual, i)});
-			 assert(same_value(expected[i], actual[i]),
-					"assert_array_equals", description,
-					"expected property ${i} to be ${expected} but got ${actual} (expected array ${arrayExpected} got ${arrayActual})",
-					{i:i, expected:expected[i], actual:actual[i],
-					 arrayExpected:shorten_array(expected, i), arrayActual:shorten_array(actual, i)});
-		 }
-	 }
-	 expose_assert(assert_array_equals, "assert_array_equals");
- 
-	 /**
-	  * Assert that each array property in ``actual`` is a number within
-	  * ± `epsilon` of the corresponding property in `expected`.
-	  *
-	  * @param {Array} actual - Array of test values.
-	  * @param {Array} expected - Array of values expected to be close to the values in ``actual``.
-	  * @param {number} epsilon - Magnitude of allowed difference
-	  * between each value in ``actual`` and ``expected``.
-	  * @param {string} [description] - Description of the condition being tested.
-	  */
-	 function assert_array_approx_equals(actual, expected, epsilon, description)
-	 {
-		 /*
-		  * Test if two primitive arrays are equal within +/- epsilon
-		  */
-		 assert(actual.length === expected.length,
-				"assert_array_approx_equals", description,
-				"lengths differ, expected ${expected} got ${actual}",
-				{expected:expected.length, actual:actual.length});
- 
-		 for (var i = 0; i < actual.length; i++) {
-			 assert(actual.hasOwnProperty(i) === expected.hasOwnProperty(i),
-					"assert_array_approx_equals", description,
-					"property ${i}, property expected to be ${expected} but was ${actual}",
-					{i:i, expected:expected.hasOwnProperty(i) ? "present" : "missing",
-					 actual:actual.hasOwnProperty(i) ? "present" : "missing"});
-			 assert(typeof actual[i] === "number",
-					"assert_array_approx_equals", description,
-					"property ${i}, expected a number but got a ${type_actual}",
-					{i:i, type_actual:typeof actual[i]});
-			 assert(Math.abs(actual[i] - expected[i]) <= epsilon,
-					"assert_array_approx_equals", description,
-					"property ${i}, expected ${expected} +/- ${epsilon}, expected ${expected} but got ${actual}",
-					{i:i, expected:expected[i], actual:actual[i], epsilon:epsilon});
-		 }
-	 }
-	 expose_assert(assert_array_approx_equals, "assert_array_approx_equals");
- 
-	 /**
-	  * Assert that ``actual`` is within ± ``epsilon`` of ``expected``.
-	  *
-	  * @param {number} actual - Test value.
-	  * @param {number} expected - Value number is expected to be close to.
-	  * @param {number} epsilon - Magnitude of allowed difference between ``actual`` and ``expected``.
-	  * @param {string} [description] - Description of the condition being tested.
-	  */
-	 function assert_approx_equals(actual, expected, epsilon, description)
-	 {
-		 /*
-		  * Test if two primitive numbers are equal within +/- epsilon
-		  */
-		 assert(typeof actual === "number",
-				"assert_approx_equals", description,
-				"expected a number but got a ${type_actual}",
-				{type_actual:typeof actual});
- 
-		 // The epsilon math below does not place nice with NaN and Infinity
-		 // But in this case Infinity = Infinity and NaN = NaN
-		 if (isFinite(actual) || isFinite(expected)) {
-			 assert(Math.abs(actual - expected) <= epsilon,
-					"assert_approx_equals", description,
-					"expected ${expected} +/- ${epsilon} but got ${actual}",
-					{expected:expected, actual:actual, epsilon:epsilon});
-		 } else {
-			 assert_equals(actual, expected);
-		 }
-	 }
-	 expose_assert(assert_approx_equals, "assert_approx_equals");
- 
-	 /**
-	  * Assert that ``actual`` is a number less than ``expected``.
-	  *
-	  * @param {number} actual - Test value.
-	  * @param {number} expected - Number that ``actual`` must be less than.
-	  * @param {string} [description] - Description of the condition being tested.
-	  */
-	 function assert_less_than(actual, expected, description)
-	 {
-		 /*
-		  * Test if a primitive number is less than another
-		  */
-		 assert(typeof actual === "number",
-				"assert_less_than", description,
-				"expected a number but got a ${type_actual}",
-				{type_actual:typeof actual});
- 
-		 assert(actual < expected,
-				"assert_less_than", description,
-				"expected a number less than ${expected} but got ${actual}",
-				{expected:expected, actual:actual});
-	 }
-	 expose_assert(assert_less_than, "assert_less_than");
- 
-	 /**
-	  * Assert that ``actual`` is a number greater than ``expected``.
-	  *
-	  * @param {number} actual - Test value.
-	  * @param {number} expected - Number that ``actual`` must be greater than.
-	  * @param {string} [description] - Description of the condition being tested.
-	  */
-	 function assert_greater_than(actual, expected, description)
-	 {
-		 /*
-		  * Test if a primitive number is greater than another
-		  */
-		 assert(typeof actual === "number",
-				"assert_greater_than", description,
-				"expected a number but got a ${type_actual}",
-				{type_actual:typeof actual});
- 
-		 assert(actual > expected,
-				"assert_greater_than", description,
-				"expected a number greater than ${expected} but got ${actual}",
-				{expected:expected, actual:actual});
-	 }
-	 expose_assert(assert_greater_than, "assert_greater_than");
- 
-	 /**
-	  * Assert that ``actual`` is a number greater than ``lower`` and less
-	  * than ``upper`` but not equal to either.
-	  *
-	  * @param {number} actual - Test value.
-	  * @param {number} lower - Number that ``actual`` must be greater than.
-	  * @param {number} upper - Number that ``actual`` must be less than.
-	  * @param {string} [description] - Description of the condition being tested.
-	  */
-	 function assert_between_exclusive(actual, lower, upper, description)
-	 {
-		 /*
-		  * Test if a primitive number is between two others
-		  */
-		 assert(typeof actual === "number",
-				"assert_between_exclusive", description,
-				"expected a number but got a ${type_actual}",
-				{type_actual:typeof actual});
- 
-		 assert(actual > lower && actual < upper,
-				"assert_between_exclusive", description,
-				"expected a number greater than ${lower} " +
-				"and less than ${upper} but got ${actual}",
-				{lower:lower, upper:upper, actual:actual});
-	 }
-	 expose_assert(assert_between_exclusive, "assert_between_exclusive");
- 
-	 /**
-	  * Assert that ``actual`` is a number less than or equal to ``expected``.
-	  *
-	  * @param {number} actual - Test value.
-	  * @param {number} expected - Number that ``actual`` must be less
-	  * than or equal to.
-	  * @param {string} [description] - Description of the condition being tested.
-	  */
-	 function assert_less_than_equal(actual, expected, description)
-	 {
-		 /*
-		  * Test if a primitive number is less than or equal to another
-		  */
-		 assert(typeof actual === "number",
-				"assert_less_than_equal", description,
-				"expected a number but got a ${type_actual}",
-				{type_actual:typeof actual});
- 
-		 assert(actual <= expected,
-				"assert_less_than_equal", description,
-				"expected a number less than or equal to ${expected} but got ${actual}",
-				{expected:expected, actual:actual});
-	 }
-	 expose_assert(assert_less_than_equal, "assert_less_than_equal");
- 
-	 /**
-	  * Assert that ``actual`` is a number greater than or equal to ``expected``.
-	  *
-	  * @param {number} actual - Test value.
-	  * @param {number} expected - Number that ``actual`` must be greater
-	  * than or equal to.
-	  * @param {string} [description] - Description of the condition being tested.
-	  */
-	 function assert_greater_than_equal(actual, expected, description)
-	 {
-		 /*
-		  * Test if a primitive number is greater than or equal to another
-		  */
-		 assert(typeof actual === "number",
-				"assert_greater_than_equal", description,
-				"expected a number but got a ${type_actual}",
-				{type_actual:typeof actual});
- 
-		 assert(actual >= expected,
-				"assert_greater_than_equal", description,
-				"expected a number greater than or equal to ${expected} but got ${actual}",
-				{expected:expected, actual:actual});
-	 }
-	 expose_assert(assert_greater_than_equal, "assert_greater_than_equal");
- 
-	 /**
-	  * Assert that ``actual`` is a number greater than or equal to ``lower`` and less
-	  * than or equal to ``upper``.
-	  *
-	  * @param {number} actual - Test value.
-	  * @param {number} lower - Number that ``actual`` must be greater than or equal to.
-	  * @param {number} upper - Number that ``actual`` must be less than or equal to.
-	  * @param {string} [description] - Description of the condition being tested.
-	  */
-	 function assert_between_inclusive(actual, lower, upper, description)
-	 {
-		 /*
-		  * Test if a primitive number is between to two others or equal to either of them
-		  */
-		 assert(typeof actual === "number",
-				"assert_between_inclusive", description,
-				"expected a number but got a ${type_actual}",
-				{type_actual:typeof actual});
- 
-		 assert(actual >= lower && actual <= upper,
-				"assert_between_inclusive", description,
-				"expected a number greater than or equal to ${lower} " +
-				"and less than or equal to ${upper} but got ${actual}",
-				{lower:lower, upper:upper, actual:actual});
-	 }
-	 expose_assert(assert_between_inclusive, "assert_between_inclusive");
- 
-	 /**
-	  * Assert that ``actual`` matches the RegExp ``expected``.
-	  *
-	  * @param {String} actual - Test string.
-	  * @param {RegExp} expected - RegExp ``actual`` must match.
-	  * @param {string} [description] - Description of the condition being tested.
-	  */
-	 function assert_regexp_match(actual, expected, description) {
-		 /*
-		  * Test if a string (actual) matches a regexp (expected)
-		  */
-		 assert(expected.test(actual),
-				"assert_regexp_match", description,
-				"expected ${expected} but got ${actual}",
-				{expected:expected, actual:actual});
-	 }
-	 expose_assert(assert_regexp_match, "assert_regexp_match");
- 
-	 /**
-	  * Assert that the class string of ``object`` as returned in
-	  * ``Object.prototype.toString`` is equal to ``class_name``.
-	  *
-	  * @param {Object} object - Object to stringify.
-	  * @param {string} class_string - Expected class string for ``object``.
-	  * @param {string} [description] - Description of the condition being tested.
-	  */
-	 function assert_class_string(object, class_string, description) {
-		 var actual = {}.toString.call(object);
-		 var expected = "[object " + class_string + "]";
-		 assert(same_value(actual, expected), "assert_class_string", description,
-											  "expected ${expected} but got ${actual}",
-											  {expected:expected, actual:actual});
-	 }
-	 expose_assert(assert_class_string, "assert_class_string");
- 
-	 /**
-	  * Assert that ``object`` has an own property with name ``property_name``.
-	  *
-	  * @param {Object} object - Object that should have the given property.
-	  * @param {string} property_name - Expected property name.
-	  * @param {string} [description] - Description of the condition being tested.
-	  */
-	 function assert_own_property(object, property_name, description) {
-		 assert(object.hasOwnProperty(property_name),
-				"assert_own_property", description,
-				"expected property ${p} missing", {p:property_name});
-	 }
-	 expose_assert(assert_own_property, "assert_own_property");
- 
-	 /**
-	  * Assert that ``object`` does not have an own property with name ``property_name``.
-	  *
-	  * @param {Object} object - Object that should not have the given property.
-	  * @param {string} property_name - Property name to test.
-	  * @param {string} [description] - Description of the condition being tested.
-	  */
-	 function assert_not_own_property(object, property_name, description) {
-		 assert(!object.hasOwnProperty(property_name),
-				"assert_not_own_property", description,
-				"unexpected property ${p} is found on object", {p:property_name});
-	 }
-	 expose_assert(assert_not_own_property, "assert_not_own_property");
- 
-	 function _assert_inherits(name) {
-		 return function (object, property_name, description)
-		 {
-			 assert((typeof object === "object" && object !== null) ||
-					typeof object === "function" ||
-					// Or has [[IsHTMLDDA]] slot
-					String(object) === "[object HTMLAllCollection]",
-					name, description,
-					"provided value is not an object");
- 
-			 assert("hasOwnProperty" in object,
-					name, description,
-					"provided value is an object but has no hasOwnProperty method");
- 
-			 assert(!object.hasOwnProperty(property_name),
-					name, description,
-					"property ${p} found on object expected in prototype chain",
-					{p:property_name});
- 
-			 assert(property_name in object,
-					name, description,
-					"property ${p} not found in prototype chain",
-					{p:property_name});
-		 };
-	 }
- 
-	 /**
-	  * Assert that ``object`` does not have an own property with name
-	  * ``property_name``, but inherits one through the prototype chain.
-	  *
-	  * @param {Object} object - Object that should have the given property in its prototype chain.
-	  * @param {string} property_name - Expected property name.
-	  * @param {string} [description] - Description of the condition being tested.
-	  */
-	 function assert_inherits(object, property_name, description) {
-		 return _assert_inherits("assert_inherits")(object, property_name, description);
-	 }
-	 expose_assert(assert_inherits, "assert_inherits");
- 
-	 /**
-	  * Alias for :js:func:`insert_inherits`.
-	  *
-	  * @param {Object} object - Object that should have the given property in its prototype chain.
-	  * @param {string} property_name - Expected property name.
-	  * @param {string} [description] - Description of the condition being tested.
-	  */
-	 function assert_idl_attribute(object, property_name, description) {
-		 return _assert_inherits("assert_idl_attribute")(object, property_name, description);
-	 }
-	 expose_assert(assert_idl_attribute, "assert_idl_attribute");
- 
- 
-	 /**
-	  * Assert that ``object`` has a property named ``property_name`` and that the property is readonly.
-	  *
-	  * Note: The implementation tries to update the named property, so
-	  * any side effects of updating will be triggered. Users are
-	  * encouraged to instead inspect the property descriptor of ``property_name`` on ``object``.
-	  *
-	  * @param {Object} object - Object that should have the given property in its prototype chain.
-	  * @param {string} property_name - Expected property name.
-	  * @param {string} [description] - Description of the condition being tested.
-	  */
-	 function assert_readonly(object, property_name, description)
-	 {
-		  var initial_value = object[property_name];
-		  try {
-			  //Note that this can have side effects in the case where
-			  //the property has PutForwards
-			  object[property_name] = initial_value + "a"; //XXX use some other value here?
-			  assert(same_value(object[property_name], initial_value),
-					 "assert_readonly", description,
-					 "changing property ${p} succeeded",
-					 {p:property_name});
-		  } finally {
-			  object[property_name] = initial_value;
-		  }
-	 }
-	 expose_assert(assert_readonly, "assert_readonly");
- 
-	 /**
-	  * Assert a JS Error with the expected constructor is thrown.
-	  *
-	  * @param {object} constructor The expected exception constructor.
-	  * @param {Function} func Function which should throw.
-	  * @param {string} [description] Error description for the case that the error is not thrown.
-	  */
-	 function assert_throws_js(constructor, func, description)
-	 {
-		 assert_throws_js_impl(constructor, func, description,
-							   "assert_throws_js");
-	 }
-	 expose_assert(assert_throws_js, "assert_throws_js");
- 
-	 /**
-	  * Like assert_throws_js but allows specifying the assertion type
-	  * (assert_throws_js or promise_rejects_js, in practice).
-	  */
-	 function assert_throws_js_impl(constructor, func, description,
-									assertion_type)
-	 {
-		 try {
-			 func.call(this);
-			 assert(false, assertion_type, description,
-					"${func} did not throw", {func:func});
-		 } catch (e) {
-			 if (e instanceof AssertionError) {
-				 throw e;
-			 }
- 
-			 // Basic sanity-checks on the thrown exception.
-			 assert(typeof e === "object",
-					assertion_type, description,
-					"${func} threw ${e} with type ${type}, not an object",
-					{func:func, e:e, type:typeof e});
- 
-			 assert(e !== null,
-					assertion_type, description,
-					"${func} threw null, not an object",
-					{func:func});
- 
-			 // Basic sanity-check on the passed-in constructor
-			 assert(typeof constructor == "function",
-					assertion_type, description,
-					"${constructor} is not a constructor",
-					{constructor:constructor});
-			 var obj = constructor;
-			 while (obj) {
-				 if (typeof obj === "function" &&
-					 obj.name === "Error") {
-					 break;
-				 }
-				 obj = Object.getPrototypeOf(obj);
-			 }
-			 assert(obj != null,
-					assertion_type, description,
-					"${constructor} is not an Error subtype",
-					{constructor:constructor});
- 
-			 // And checking that our exception is reasonable
-			 assert(e.constructor === constructor &&
-					e.name === constructor.name,
-					assertion_type, description,
-					"${func} threw ${actual} (${actual_name}) expected instance of ${expected} (${expected_name})",
-					{func:func, actual:e, actual_name:e.name,
-					 expected:constructor,
-					 expected_name:constructor.name});
-		 }
-	 }
- 
-	 // TODO: Figure out how to document the overloads better.
-	 // sphinx-js doesn't seem to handle @variation correctly,
-	 // and only expects a single JSDoc entry per function.
-	 /**
-	  * Assert a DOMException with the expected type is thrown.
-	  *
-	  * There are two ways of calling assert_throws_dom:
-	  *
-	  * 1) If the DOMException is expected to come from the current global, the
-	  * second argument should be the function expected to throw and a third,
-	  * optional, argument is the assertion description.
-	  *
-	  * 2) If the DOMException is expected to come from some other global, the
-	  * second argument should be the DOMException constructor from that global,
-	  * the third argument the function expected to throw, and the fourth, optional,
-	  * argument the assertion description.
-	  *
-	  * @param {number|string} type - The expected exception name or
-	  * code.  See the `table of names and codes
-	  * <https://webidl.spec.whatwg.org/#dfn-error-names-table>`_. If a
-	  * number is passed it should be one of the numeric code values in
-	  * that table (e.g. 3, 4, etc).  If a string is passed it can
-	  * either be an exception name (e.g. "HierarchyRequestError",
-	  * "WrongDocumentError") or the name of the corresponding error
-	  * code (e.g. "``HIERARCHY_REQUEST_ERR``", "``WRONG_DOCUMENT_ERR``").
-	  * @param {Function} descriptionOrFunc - The function expected to
-	  * throw (if the exception comes from another global), or the
-	  * optional description of the condition being tested (if the
-	  * exception comes from the current global).
-	  * @param {string} [description] - Description of the condition
-	  * being tested (if the exception comes from another global).
-	  *
-	  */
-	 function assert_throws_dom(type, funcOrConstructor, descriptionOrFunc, maybeDescription)
-	 {
-		 let constructor, func, description;
-		 if (funcOrConstructor.name === "DOMException") {
-			 constructor = funcOrConstructor;
-			 func = descriptionOrFunc;
-			 description = maybeDescription;
-		 } else {
-			 constructor = self.DOMException;
-			 func = funcOrConstructor;
-			 description = descriptionOrFunc;
-			 assert(maybeDescription === undefined,
-					"Too many args pased to no-constructor version of assert_throws_dom");
-		 }
-		 assert_throws_dom_impl(type, func, description, "assert_throws_dom", constructor)
-	 }
-	 expose_assert(assert_throws_dom, "assert_throws_dom");
- 
-	 /**
-	  * Similar to assert_throws_dom but allows specifying the assertion type
-	  * (assert_throws_dom or promise_rejects_dom, in practice).  The
-	  * "constructor" argument must be the DOMException constructor from the
-	  * global we expect the exception to come from.
-	  */
-	 function assert_throws_dom_impl(type, func, description, assertion_type, constructor)
-	 {
-		 try {
-			 func.call(this);
-			 assert(false, assertion_type, description,
-					"${func} did not throw", {func:func});
-		 } catch (e) {
-			 if (e instanceof AssertionError) {
-				 throw e;
-			 }
- 
-			 // Basic sanity-checks on the thrown exception.
-			 assert(typeof e === "object",
-					assertion_type, description,
-					"${func} threw ${e} with type ${type}, not an object",
-					{func:func, e:e, type:typeof e});
- 
-			 assert(e !== null,
-					assertion_type, description,
-					"${func} threw null, not an object",
-					{func:func});
- 
-			 // Sanity-check our type
-			 assert(typeof type == "number" ||
-					typeof type == "string",
-					assertion_type, description,
-					"${type} is not a number or string",
-					{type:type});
- 
-			 var codename_name_map = {
-				 INDEX_SIZE_ERR: 'IndexSizeError',
-				 HIERARCHY_REQUEST_ERR: 'HierarchyRequestError',
-				 WRONG_DOCUMENT_ERR: 'WrongDocumentError',
-				 INVALID_CHARACTER_ERR: 'InvalidCharacterError',
-				 NO_MODIFICATION_ALLOWED_ERR: 'NoModificationAllowedError',
-				 NOT_FOUND_ERR: 'NotFoundError',
-				 NOT_SUPPORTED_ERR: 'NotSupportedError',
-				 INUSE_ATTRIBUTE_ERR: 'InUseAttributeError',
-				 INVALID_STATE_ERR: 'InvalidStateError',
-				 SYNTAX_ERR: 'SyntaxError',
-				 INVALID_MODIFICATION_ERR: 'InvalidModificationError',
-				 NAMESPACE_ERR: 'NamespaceError',
-				 INVALID_ACCESS_ERR: 'InvalidAccessError',
-				 TYPE_MISMATCH_ERR: 'TypeMismatchError',
-				 SECURITY_ERR: 'SecurityError',
-				 NETWORK_ERR: 'NetworkError',
-				 ABORT_ERR: 'AbortError',
-				 URL_MISMATCH_ERR: 'URLMismatchError',
-				 QUOTA_EXCEEDED_ERR: 'QuotaExceededError',
-				 TIMEOUT_ERR: 'TimeoutError',
-				 INVALID_NODE_TYPE_ERR: 'InvalidNodeTypeError',
-				 DATA_CLONE_ERR: 'DataCloneError'
-			 };
- 
-			 var name_code_map = {
-				 IndexSizeError: 1,
-				 HierarchyRequestError: 3,
-				 WrongDocumentError: 4,
-				 InvalidCharacterError: 5,
-				 NoModificationAllowedError: 7,
-				 NotFoundError: 8,
-				 NotSupportedError: 9,
-				 InUseAttributeError: 10,
-				 InvalidStateError: 11,
-				 SyntaxError: 12,
-				 InvalidModificationError: 13,
-				 NamespaceError: 14,
-				 InvalidAccessError: 15,
-				 TypeMismatchError: 17,
-				 SecurityError: 18,
-				 NetworkError: 19,
-				 AbortError: 20,
-				 URLMismatchError: 21,
-				 QuotaExceededError: 22,
-				 TimeoutError: 23,
-				 InvalidNodeTypeError: 24,
-				 DataCloneError: 25,
- 
-				 EncodingError: 0,
-				 NotReadableError: 0,
-				 UnknownError: 0,
-				 ConstraintError: 0,
-				 DataError: 0,
-				 TransactionInactiveError: 0,
-				 ReadOnlyError: 0,
-				 VersionError: 0,
-				 OperationError: 0,
-				 NotAllowedError: 0
-			 };
- 
-			 var code_name_map = {};
-			 for (var key in name_code_map) {
-				 if (name_code_map[key] > 0) {
-					 code_name_map[name_code_map[key]] = key;
-				 }
-			 }
- 
-			 var required_props = {};
-			 var name;
- 
-			 if (typeof type === "number") {
-				 if (type === 0) {
-					 throw new AssertionError('Test bug: ambiguous DOMException code 0 passed to assert_throws_dom()');
-				 } else if (!(type in code_name_map)) {
-					 throw new AssertionError('Test bug: unrecognized DOMException code "' + type + '" passed to assert_throws_dom()');
-				 }
-				 name = code_name_map[type];
-				 required_props.code = type;
-			 } else if (typeof type === "string") {
-				 name = type in codename_name_map ? codename_name_map[type] : type;
-				 if (!(name in name_code_map)) {
-					 throw new AssertionError('Test bug: unrecognized DOMException code name or name "' + type + '" passed to assert_throws_dom()');
-				 }
- 
-				 required_props.code = name_code_map[name];
-			 }
- 
-			 if (required_props.code === 0 ||
-				("name" in e &&
-				 e.name !== e.name.toUpperCase() &&
-				 e.name !== "DOMException")) {
-				 // New style exception: also test the name property.
-				 required_props.name = name;
-			 }
- 
-			 for (var prop in required_props) {
-				 assert(prop in e && e[prop] == required_props[prop],
-						assertion_type, description,
-						"${func} threw ${e} that is not a DOMException " + type + ": property ${prop} is equal to ${actual}, expected ${expected}",
-						{func:func, e:e, prop:prop, actual:e[prop], expected:required_props[prop]});
-			 }
- 
-			 // Check that the exception is from the right global.  This check is last
-			 // so more specific, and more informative, checks on the properties can
-			 // happen in case a totally incorrect exception is thrown.
-			 assert(e.constructor === constructor,
-					assertion_type, description,
-					"${func} threw an exception from the wrong global",
-					{func});
- 
-		 }
-	 }
- 
-	 /**
-	  * Assert the provided value is thrown.
-	  *
-	  * @param {value} exception The expected exception.
-	  * @param {Function} func Function which should throw.
-	  * @param {string} [description] Error description for the case that the error is not thrown.
-	  */
-	 function assert_throws_exactly(exception, func, description)
-	 {
-		 assert_throws_exactly_impl(exception, func, description,
-									"assert_throws_exactly");
-	 }
-	 expose_assert(assert_throws_exactly, "assert_throws_exactly");
- 
-	 /**
-	  * Like assert_throws_exactly but allows specifying the assertion type
-	  * (assert_throws_exactly or promise_rejects_exactly, in practice).
-	  */
-	 function assert_throws_exactly_impl(exception, func, description,
-										 assertion_type)
-	 {
-		 try {
-			 func.call(this);
-			 assert(false, assertion_type, description,
-					"${func} did not throw", {func:func});
-		 } catch (e) {
-			 if (e instanceof AssertionError) {
-				 throw e;
-			 }
- 
-			 assert(same_value(e, exception), assertion_type, description,
-					"${func} threw ${e} but we expected it to throw ${exception}",
-					{func:func, e:e, exception:exception});
-		 }
-	 }
- 
-	 /**
-	  * Asserts if called. Used to ensure that a specific codepath is
-	  * not taken e.g. that an error event isn't fired.
-	  *
-	  * @param {string} [description] - Description of the condition being tested.
-	  */
-	 function assert_unreached(description) {
-		  assert(false, "assert_unreached", description,
-				 "Reached unreachable code");
-	 }
-	 expose_assert(assert_unreached, "assert_unreached");
- 
-	 /**
-	  * @callback AssertFunc
-	  * @param {Any} actual
-	  * @param {Any} expected
-	  * @param {Any[]} args
-	  */
- 
-	 /**
-	  * Asserts that ``actual`` matches at least one value of ``expected``
-	  * according to a comparison defined by ``assert_func``.
-	  *
-	  * Note that tests with multiple allowed pass conditions are bad
-	  * practice unless the spec specifically allows multiple
-	  * behaviours. Test authors should not use this method simply to
-	  * hide UA bugs.
-	  *
-	  * @param {AssertFunc} assert_func - Function to compare actual
-	  * and expected. It must throw when the comparison fails and
-	  * return when the comparison passes.
-	  * @param {Any} actual - Test value.
-	  * @param {Array} expected_array - Array of possible expected values.
-	  * @param {Any[]} args - Additional arguments to pass to ``assert_func``.
-	  */
-	 function assert_any(assert_func, actual, expected_array, ...args)
-	 {
-		 var errors = [];
-		 var passed = false;
-		 forEach(expected_array,
-				 function(expected)
-				 {
-					 try {
-						 assert_func.apply(this, [actual, expected].concat(args));
-						 passed = true;
-					 } catch (e) {
-						 errors.push(e.message);
-					 }
-				 });
-		 if (!passed) {
-			 throw new AssertionError(errors.join("\n\n"));
-		 }
-	 }
-	 // FIXME: assert_any cannot use expose_assert, because assert_wrapper does
-	 // not support nested assert calls (e.g. to assert_func). We need to
-	 // support bypassing assert_wrapper for the inner asserts here.
-	 expose(assert_any, "assert_any");
- 
-	 /**
-	  * Assert that a feature is implemented, based on a 'truthy' condition.
-	  *
-	  * This function should be used to early-exit from tests in which there is
-	  * no point continuing without support for a non-optional spec or spec
-	  * feature. For example:
-	  *
-	  *     assert_implements(window.Foo, 'Foo is not supported');
-	  *
-	  * @param {object} condition The truthy value to test
-	  * @param {string} [description] Error description for the case that the condition is not truthy.
-	  */
-	 function assert_implements(condition, description) {
-		 assert(!!condition, "assert_implements", description);
-	 }
-	 expose_assert(assert_implements, "assert_implements")
- 
-	 /**
-	  * Assert that an optional feature is implemented, based on a 'truthy' condition.
-	  *
-	  * This function should be used to early-exit from tests in which there is
-	  * no point continuing without support for an explicitly optional spec or
-	  * spec feature. For example:
-	  *
-	  *     assert_implements_optional(video.canPlayType("video/webm"),
-	  *                                "webm video playback not supported");
-	  *
-	  * @param {object} condition The truthy value to test
-	  * @param {string} [description] Error description for the case that the condition is not truthy.
-	  */
-	 function assert_implements_optional(condition, description) {
-		 if (!condition) {
-			 throw new OptionalFeatureUnsupportedError(description);
-		 }
-	 }
-	 expose_assert(assert_implements_optional, "assert_implements_optional");
- 
-	 /**
-	  * @class
-	  *
-	  * A single subtest. A Test is not constructed directly but via the
-	  * :js:func:`test`, :js:func:`async_test` or :js:func:`promise_test` functions.
-	  *
-	  * @param {string} name - This must be unique in a given file and must be
-	  * invariant between runs.
-	  *
-	  */
-	 function Test(name, properties)
-	 {
-		 if (tests.file_is_test && tests.tests.length) {
-			 throw new Error("Tried to create a test with file_is_test");
-		 }
-		 /** The test name. */
-		 this.name = name;
- 
-		 this.phase = (tests.is_aborted || tests.phase === tests.phases.COMPLETE) ?
-			 this.phases.COMPLETE : this.phases.INITIAL;
- 
-		 /** The test status code.*/
-		 this.status = this.NOTRUN;
-		 this.timeout_id = null;
-		 this.index = null;
- 
-		 this.properties = properties || {};
-		 this.timeout_length = settings.test_timeout;
-		 if (this.timeout_length !== null) {
-			 this.timeout_length *= tests.timeout_multiplier;
-		 }
- 
-		 /** A message indicating the reason for test failure. */
-		 this.message = null;
-		 /** Stack trace in case of failure. */
-		 this.stack = null;
- 
-		 this.steps = [];
-		 this._is_promise_test = false;
- 
-		 this.cleanup_callbacks = [];
-		 this._user_defined_cleanup_count = 0;
-		 this._done_callbacks = [];
- 
-		 // Tests declared following harness completion are likely an indication
-		 // of a programming error, but they cannot be reported
-		 // deterministically.
-		 if (tests.phase === tests.phases.COMPLETE) {
-			 return;
-		 }
- 
-		 tests.push(this);
-	 }
- 
-	 /**
-	  * Enum of possible test statuses.
-	  *
-	  * :values:
-	  *   - ``PASS``
-	  *   - ``FAIL``
-	  *   - ``TIMEOUT``
-	  *   - ``NOTRUN``
-	  *   - ``PRECONDITION_FAILED``
-	  */
-	 Test.statuses = {
-		 PASS:0,
-		 FAIL:1,
-		 TIMEOUT:2,
-		 NOTRUN:3,
-		 PRECONDITION_FAILED:4
-	 };
- 
-	 Test.prototype = merge({}, Test.statuses);
- 
-	 Test.prototype.phases = {
-		 INITIAL:0,
-		 STARTED:1,
-		 HAS_RESULT:2,
-		 CLEANING:3,
-		 COMPLETE:4
-	 };
- 
-	 Test.prototype.status_formats = {
-		 0: "Pass",
-		 1: "Fail",
-		 2: "Timeout",
-		 3: "Not Run",
-		 4: "Optional Feature Unsupported",
-	 }
- 
-	 Test.prototype.format_status = function() {
-		 return this.status_formats[this.status];
-	 }
- 
-	 Test.prototype.structured_clone = function()
-	 {
-		 if (!this._structured_clone) {
-			 var msg = this.message;
-			 msg = msg ? String(msg) : msg;
-			 this._structured_clone = merge({
-				 name:String(this.name),
-				 properties:merge({}, this.properties),
-				 phases:merge({}, this.phases)
-			 }, Test.statuses);
-		 }
-		 this._structured_clone.status = this.status;
-		 this._structured_clone.message = this.message;
-		 this._structured_clone.stack = this.stack;
-		 this._structured_clone.index = this.index;
-		 this._structured_clone.phase = this.phase;
-		 return this._structured_clone;
-	 };
- 
-	 /**
-	  * Run a single step of an ongoing test.
-	  *
-	  * @param {string} func - Callback function to run as a step. If
-	  * this throws an :js:func:`AssertionError`, or any other
-	  * exception, the :js:class:`Test` status is set to ``FAIL``.
-	  * @param {Object} [this_obj] - The object to use as the this
-	  * value when calling ``func``. Defaults to the  :js:class:`Test` object.
-	  */
-	 Test.prototype.step = function(func, this_obj)
-	 {
-		 if (this.phase > this.phases.STARTED) {
-			 return;
-		 }
- 
-		 if (settings.debug && this.phase !== this.phases.STARTED) {
-			 console.log("TEST START", this.name);
-		 }
-		 this.phase = this.phases.STARTED;
-		 //If we don't get a result before the harness times out that will be a test timeout
-		 this.set_status(this.TIMEOUT, "Test timed out");
- 
-		 tests.started = true;
-		 tests.current_test = this;
-		 tests.notify_test_state(this);
- 
-		 if (this.timeout_id === null) {
-			 this.set_timeout();
-		 }
- 
-		 this.steps.push(func);
- 
-		 if (arguments.length === 1) {
-			 this_obj = this;
-		 }
- 
-		 if (settings.debug) {
-			 console.debug("TEST STEP", this.name);
-		 }
- 
-		 try {
-			 return func.apply(this_obj, Array.prototype.slice.call(arguments, 2));
-		 } catch (e) {
-			 if (this.phase >= this.phases.HAS_RESULT) {
-				 return;
-			 }
-			 var status = e instanceof OptionalFeatureUnsupportedError ? this.PRECONDITION_FAILED : this.FAIL;
-			 var message = String((typeof e === "object" && e !== null) ? e.message : e);
-			 var stack = e.stack ? e.stack : null;
- 
-			 this.set_status(status, message, stack);
-			 this.phase = this.phases.HAS_RESULT;
-			 this.done();
-		 } finally {
-			 this.current_test = null;
-		 }
-	 };
- 
-	 /**
-	  * Wrap a function so that it runs as a step of the current test.
-	  *
-	  * This allows creating a callback function that will run as a
-	  * test step.
-	  *
-	  * @example
-	  * let t = async_test("Example");
-	  * onload = t.step_func(e => {
-	  *   assert_equals(e.name, "load");
-	  *   // Mark the test as complete.
-	  *   t.done();
-	  * })
-	  *
-	  * @param {string} func - Function to run as a step. If this
-	  * throws an :js:func:`AssertionError`, or any other exception,
-	  * the :js:class:`Test` status is set to ``FAIL``.
-	  * @param {Object} [this_obj] - The object to use as the this
-	  * value when calling ``func``. Defaults to the :js:class:`Test` object.
-	  */
-	 Test.prototype.step_func = function(func, this_obj)
-	 {
-		 var test_this = this;
- 
-		 if (arguments.length === 1) {
-			 this_obj = test_this;
-		 }
- 
-		 return function()
-		 {
-			 return test_this.step.apply(test_this, [func, this_obj].concat(
-				 Array.prototype.slice.call(arguments)));
-		 };
-	 };
- 
-	 /**
-	  * Wrap a function so that it runs as a step of the current test,
-	  * and automatically marks the test as complete if the function
-	  * returns without error.
-	  *
-	  * @param {string} func - Function to run as a step. If this
-	  * throws an :js:func:`AssertionError`, or any other exception,
-	  * the :js:class:`Test` status is set to ``FAIL``. If it returns
-	  * without error the status is set to ``PASS``.
-	  * @param {Object} [this_obj] - The object to use as the this
-	  * value when calling `func`. Defaults to the :js:class:`Test` object.
-	  */
-	 Test.prototype.step_func_done = function(func, this_obj)
-	 {
-		 var test_this = this;
- 
-		 if (arguments.length === 1) {
-			 this_obj = test_this;
-		 }
- 
-		 return function()
-		 {
-			 if (func) {
-				 test_this.step.apply(test_this, [func, this_obj].concat(
-					 Array.prototype.slice.call(arguments)));
-			 }
-			 test_this.done();
-		 };
-	 };
- 
-	 /**
-	  * Return a function that automatically sets the current test to
-	  * ``FAIL`` if it's called.
-	  *
-	  * @param {string} [description] - Error message to add to assert
-	  * in case of failure.
-	  *
-	  */
-	 Test.prototype.unreached_func = function(description)
-	 {
-		 return this.step_func(function() {
-			 assert_unreached(description);
-		 });
-	 };
- 
-	 /**
-	  * Run a function as a step of the test after a given timeout.
-	  *
-	  * This multiplies the timeout by the global timeout multiplier to
-	  * account for the expected execution speed of the current test
-	  * environment. For example ``test.step_timeout(f, 2000)`` with a
-	  * timeout multiplier of 2 will wait for 4000ms before calling ``f``.
-	  *
-	  * In general it's encouraged to use :js:func:`Test.step_wait` or
-	  * :js:func:`step_wait_func` in preference to this function where possible,
-	  * as they provide better test performance.
-	  *
-	  * @param {Function} func - Function to run as a test
-	  * step.
-	  * @param {number} timeout - Time in ms to wait before running the
-	  * test step. The actual wait time is ``timeout`` x
-	  * ``timeout_multiplier``.
-	  *
-	  */
-	 Test.prototype.step_timeout = function(func, timeout) {
-		 var test_this = this;
-		 var args = Array.prototype.slice.call(arguments, 2);
-		 return setTimeout(this.step_func(function() {
-			 return func.apply(test_this, args);
-		 }), timeout * tests.timeout_multiplier);
-	 };
- 
-	 /**
-	  * Poll for a function to return true, and call a callback
-	  * function once it does, or assert if a timeout is
-	  * reached. This is preferred over a simple step_timeout
-	  * whenever possible since it allows the timeout to be longer
-	  * to reduce intermittents without compromising test execution
-	  * speed when the condition is quickly met.
-	  *
-	  * @example
-	  * async_test(t => {
-	  *  const popup = window.open("resources/coop-coep.py?coop=same-origin&coep=&navigate=about:blank");
-	  *  t.add_cleanup(() => popup.close());
-	  *  assert_equals(window, popup.opener);
-	  *
-	  *  popup.onload = t.step_func(() => {
-	  *    assert_true(popup.location.href.endsWith("&navigate=about:blank"));
-	  *    // Use step_wait_func_done as about:blank cannot message back.
-	  *    t.step_wait_func_done(() => popup.location.href === "about:blank");
-	  *  });
-	  * }, "Navigating a popup to about:blank");
-	  *
-	  * @param {Function} cond A function taking no arguments and
-	  *                        returning a boolean. The callback is called
-	  *                        when this function returns true.
-	  * @param {Function} func A function taking no arguments to call once
-	  *                        the condition is met.
-	  * @param {string} [description] Error message to add to assert in case of
-	  *                               failure.
-	  * @param {number} timeout Timeout in ms. This is multiplied by the global
-	  *                         timeout_multiplier
-	  * @param {number} interval Polling interval in ms
-	  *
-	  */
-	 Test.prototype.step_wait_func = function(cond, func, description,
-											  timeout=3000, interval=100) {
-		 var timeout_full = timeout * tests.timeout_multiplier;
-		 var remaining = Math.ceil(timeout_full / interval);
-		 var test_this = this;
- 
-		 var wait_for_inner = test_this.step_func(() => {
-			 if (cond()) {
-				 func();
-			 } else {
-				 if(remaining === 0) {
-					 assert(false, "step_wait_func", description,
-							"Timed out waiting on condition");
-				 }
-				 remaining--;
-				 setTimeout(wait_for_inner, interval);
-			 }
-		 });
- 
-		 wait_for_inner();
-	 };
- 
-	 /**
-	  * Poll for a function to return true, and invoke a callback
-	  * followed by this.done() once it does, or assert if a timeout
-	  * is reached. This is preferred over a simple step_timeout
-	  * whenever possible since it allows the timeout to be longer
-	  * to reduce intermittents without compromising test execution speed
-	  * when the condition is quickly met.
-	  *
-	  * @param {Function} cond A function taking no arguments and
-	  *                        returning a boolean. The callback is called
-	  *                        when this function returns true.
-	  * @param {Function} func A function taking no arguments to call once
-	  *                        the condition is met.
-	  * @param {string} [description] Error message to add to assert in case of
-	  *                               failure.
-	  * @param {number} timeout Timeout in ms. This is multiplied by the global
-	  *                         timeout_multiplier
-	  * @param {number} interval Polling interval in ms
-	  *
-	  */
-	 Test.prototype.step_wait_func_done = function(cond, func, description,
-												   timeout=3000, interval=100) {
-		  this.step_wait_func(cond, () => {
-			 if (func) {
-				 func();
-			 }
-			 this.done();
-		  }, description, timeout, interval);
-	 };
- 
-	 /**
-	  * Poll for a function to return true, and resolve a promise
-	  * once it does, or assert if a timeout is reached. This is
-	  * preferred over a simple step_timeout whenever possible
-	  * since it allows the timeout to be longer to reduce
-	  * intermittents without compromising test execution speed
-	  * when the condition is quickly met.
-	  *
-	  * @example
-	  * promise_test(async t => {
-	  *  // …
-	  * await t.step_wait(() => frame.contentDocument === null, "Frame navigated to a cross-origin document");
-	  * // …
-	  * }, "");
-	  *
-	  * @param {Function} cond A function taking no arguments and
-	  *                        returning a boolean.
-	  * @param {string} [description] Error message to add to assert in case of
-	  *                              failure.
-	  * @param {number} timeout Timeout in ms. This is multiplied by the global
-	  *                         timeout_multiplier
-	  * @param {number} interval Polling interval in ms
-	  * @returns {Promise} Promise resolved once cond is met.
-	  *
-	  */
-	 Test.prototype.step_wait = function(cond, description, timeout=3000, interval=100) {
-		 return new Promise(resolve => {
-			 this.step_wait_func(cond, resolve, description, timeout, interval);
-		 });
-	 }
- 
-	 /*
-	  * Private method for registering cleanup functions. `testharness.js`
-	  * internals should use this method instead of the public `add_cleanup`
-	  * method in order to hide implementation details from the harness status
-	  * message in the case errors.
-	  */
-	 Test.prototype._add_cleanup = function(callback) {
-		 this.cleanup_callbacks.push(callback);
-	 };
- 
-	 /**
-	  * Schedule a function to be run after the test result is known, regardless
-	  * of passing or failing state.
-	  *
-	  * The behavior of this function will not
-	  * influence the result of the test, but if an exception is thrown, the
-	  * test harness will report an error.
-	  *
-	  * @param {Function} callback - The cleanup function to run. This
-	  * is called with no arguments.
-	  */
-	 Test.prototype.add_cleanup = function(callback) {
-		 this._user_defined_cleanup_count += 1;
-		 this._add_cleanup(callback);
-	 };
- 
-	 Test.prototype.set_timeout = function()
-	 {
-		 if (this.timeout_length !== null) {
-			 var this_obj = this;
-			 this.timeout_id = setTimeout(function()
-										  {
-											  this_obj.timeout();
-										  }, this.timeout_length);
-		 }
-	 };
- 
-	 Test.prototype.set_status = function(status, message, stack)
-	 {
-		 this.status = status;
-		 this.message = message;
-		 this.stack = stack ? stack : null;
-	 };
- 
-	 /**
-	  * Manually set the test status to ``TIMEOUT``.
-	  */
-	 Test.prototype.timeout = function()
-	 {
-		 this.timeout_id = null;
-		 this.set_status(this.TIMEOUT, "Test timed out");
-		 this.phase = this.phases.HAS_RESULT;
-		 this.done();
-	 };
- 
-	 /**
-	  * Manually set the test status to ``TIMEOUT``.
-	  *
-	  * Alias for `Test.timeout <#Test.timeout>`_.
-	  */
-	 Test.prototype.force_timeout = function() {
-		 return this.timeout();
-	 };
- 
-	 /**
-	  * Mark the test as complete.
-	  *
-	  * This sets the test status to ``PASS`` if no other status was
-	  * already recorded. Any subsequent attempts to run additional
-	  * test steps will be ignored.
-	  *
-	  * After setting the test status any test cleanup functions will
-	  * be run.
-	  */
-	 Test.prototype.done = function()
-	 {
-		 if (this.phase >= this.phases.CLEANING) {
-			 return;
-		 }
- 
-		 if (this.phase <= this.phases.STARTED) {
-			 this.set_status(this.PASS, null);
-		 }
- 
-		 if (global_scope.clearTimeout) {
-			 clearTimeout(this.timeout_id);
-		 }
- 
-		 if (settings.debug) {
-			 console.log("TEST DONE",
-						 this.status,
-						 this.name);
-		 }
- 
-		 this.cleanup();
-	 };
- 
-	 function add_test_done_callback(test, callback)
-	 {
-		 if (test.phase === test.phases.COMPLETE) {
-			 callback();
-			 return;
-		 }
- 
-		 test._done_callbacks.push(callback);
-	 }
- 
-	 /*
-	  * Invoke all specified cleanup functions. If one or more produce an error,
-	  * the context is in an unpredictable state, so all further testing should
-	  * be cancelled.
-	  */
-	 Test.prototype.cleanup = function() {
-		 var errors = [];
-		 var bad_value_count = 0;
-		 function on_error(e) {
-			 errors.push(e);
-			 // Abort tests immediately so that tests declared within subsequent
-			 // cleanup functions are not run.
-			 tests.abort();
-		 }
-		 var this_obj = this;
-		 var results = [];
- 
-		 this.phase = this.phases.CLEANING;
- 
-		 forEach(this.cleanup_callbacks,
-				 function(cleanup_callback) {
-					 var result;
- 
-					 try {
-						 result = cleanup_callback();
-					 } catch (e) {
-						 on_error(e);
-						 return;
-					 }
- 
-					 if (!is_valid_cleanup_result(this_obj, result)) {
-						 bad_value_count += 1;
-						 // Abort tests immediately so that tests declared
-						 // within subsequent cleanup functions are not run.
-						 tests.abort();
-					 }
- 
-					 results.push(result);
-				 });
- 
-		 if (!this._is_promise_test) {
-			 cleanup_done(this_obj, errors, bad_value_count);
-		 } else {
-			 all_async(results,
-					   function(result, done) {
-						   if (result && typeof result.then === "function") {
-							   result
-								   .then(null, on_error)
-								   .then(done);
-						   } else {
-							   done();
-						   }
-					   },
-					   function() {
-						   cleanup_done(this_obj, errors, bad_value_count);
-					   });
-		 }
-	 };
- 
-	 /*
-	  * Determine if the return value of a cleanup function is valid for a given
-	  * test. Any test may return the value `undefined`. Tests created with
-	  * `promise_test` may alternatively return "thenable" object values.
-	  */
-	 function is_valid_cleanup_result(test, result) {
-		 if (result === undefined) {
-			 return true;
-		 }
- 
-		 if (test._is_promise_test) {
-			 return result && typeof result.then === "function";
-		 }
- 
-		 return false;
-	 }
- 
-	 function cleanup_done(test, errors, bad_value_count) {
-		 if (errors.length || bad_value_count) {
-			 var total = test._user_defined_cleanup_count;
- 
-			 tests.status.status = tests.status.ERROR;
-			 tests.status.stack = null;
-			 tests.status.message = "Test named '" + test.name +
-				 "' specified " + total +
-				 " 'cleanup' function" + (total > 1 ? "s" : "");
- 
-			 if (errors.length) {
-				 tests.status.message += ", and " + errors.length + " failed";
-				 tests.status.stack = ((typeof errors[0] === "object" &&
-										errors[0].hasOwnProperty("stack")) ?
-									   errors[0].stack : null);
-			 }
- 
-			 if (bad_value_count) {
-				 var type = test._is_promise_test ?
-					"non-thenable" : "non-undefined";
-				 tests.status.message += ", and " + bad_value_count +
-					 " returned a " + type + " value";
-			 }
- 
-			 tests.status.message += ".";
-		 }
- 
-		 test.phase = test.phases.COMPLETE;
-		 tests.result(test);
-		 forEach(test._done_callbacks,
-				 function(callback) {
-					 callback();
-				 });
-		 test._done_callbacks.length = 0;
-	 }
- 
-	 /**
-	  * A RemoteTest object mirrors a Test object on a remote worker. The
-	  * associated RemoteWorker updates the RemoteTest object in response to
-	  * received events. In turn, the RemoteTest object replicates these events
-	  * on the local document. This allows listeners (test result reporting
-	  * etc..) to transparently handle local and remote events.
-	  */
-	 function RemoteTest(clone) {
-		 var this_obj = this;
-		 Object.keys(clone).forEach(
-				 function(key) {
-					 this_obj[key] = clone[key];
-				 });
-		 this.index = null;
-		 this.phase = this.phases.INITIAL;
-		 this.update_state_from(clone);
-		 this._done_callbacks = [];
-		 tests.push(this);
-	 }
- 
-	 RemoteTest.prototype.structured_clone = function() {
-		 var clone = {};
-		 Object.keys(this).forEach(
-				 (function(key) {
-					 var value = this[key];
-					 // `RemoteTest` instances are responsible for managing
-					 // their own "done" callback functions, so those functions
-					 // are not relevant in other execution contexts. Because of
-					 // this (and because Function values cannot be serialized
-					 // for cross-realm transmittance), the property should not
-					 // be considered when cloning instances.
-					 if (key === '_done_callbacks' ) {
-						 return;
-					 }
- 
-					 if (typeof value === "object" && value !== null) {
-						 clone[key] = merge({}, value);
-					 } else {
-						 clone[key] = value;
-					 }
-				 }).bind(this));
-		 clone.phases = merge({}, this.phases);
-		 return clone;
-	 };
- 
-	 /**
-	  * `RemoteTest` instances are objects which represent tests running in
-	  * another realm. They do not define "cleanup" functions (if necessary,
-	  * such functions are defined on the associated `Test` instance within the
-	  * external realm). However, `RemoteTests` may have "done" callbacks (e.g.
-	  * as attached by the `Tests` instance responsible for tracking the overall
-	  * test status in the parent realm). The `cleanup` method delegates to
-	  * `done` in order to ensure that such callbacks are invoked following the
-	  * completion of the `RemoteTest`.
-	  */
-	 RemoteTest.prototype.cleanup = function() {
-		 this.done();
-	 };
-	 RemoteTest.prototype.phases = Test.prototype.phases;
-	 RemoteTest.prototype.update_state_from = function(clone) {
-		 this.status = clone.status;
-		 this.message = clone.message;
-		 this.stack = clone.stack;
-		 if (this.phase === this.phases.INITIAL) {
-			 this.phase = this.phases.STARTED;
-		 }
-	 };
-	 RemoteTest.prototype.done = function() {
-		 this.phase = this.phases.COMPLETE;
- 
-		 forEach(this._done_callbacks,
-				 function(callback) {
-					 callback();
-				 });
-	 }
- 
-	 RemoteTest.prototype.format_status = function() {
-		 return Test.prototype.status_formats[this.status];
-	 }
- 
-	 /*
-	  * A RemoteContext listens for test events from a remote test context, such
-	  * as another window or a worker. These events are then used to construct
-	  * and maintain RemoteTest objects that mirror the tests running in the
-	  * remote context.
-	  *
-	  * An optional third parameter can be used as a predicate to filter incoming
-	  * MessageEvents.
-	  */
-	 function RemoteContext(remote, message_target, message_filter) {
-		 this.running = true;
-		 this.started = false;
-		 this.tests = new Array();
-		 this.early_exception = null;
- 
-		 var this_obj = this;
-		 // If remote context is cross origin assigning to onerror is not
-		 // possible, so silently catch those errors.
-		 try {
-		   remote.onerror = function(error) { this_obj.remote_error(error); };
-		 } catch (e) {
-		   // Ignore.
-		 }
- 
-		 // Keeping a reference to the remote object and the message handler until
-		 // remote_done() is seen prevents the remote object and its message channel
-		 // from going away before all the messages are dispatched.
-		 this.remote = remote;
-		 this.message_target = message_target;
-		 this.message_handler = function(message) {
-			 var passesFilter = !message_filter || message_filter(message);
-			 // The reference to the `running` property in the following
-			 // condition is unnecessary because that value is only set to
-			 // `false` after the `message_handler` function has been
-			 // unsubscribed.
-			 // TODO: Simplify the condition by removing the reference.
-			 if (this_obj.running && message.data && passesFilter &&
-				 (message.data.type in this_obj.message_handlers)) {
-				 this_obj.message_handlers[message.data.type].call(this_obj, message.data);
-			 }
-		 };
- 
-		 if (self.Promise) {
-			 this.done = new Promise(function(resolve) {
-				 this_obj.doneResolve = resolve;
-			 });
-		 }
- 
-		 this.message_target.addEventListener("message", this.message_handler);
-	 }
- 
-	 RemoteContext.prototype.remote_error = function(error) {
-		 if (error.preventDefault) {
-			 error.preventDefault();
-		 }
- 
-		 // Defer interpretation of errors until the testing protocol has
-		 // started and the remote test's `allow_uncaught_exception` property
-		 // is available.
-		 if (!this.started) {
-			 this.early_exception = error;
-		 } else if (!this.allow_uncaught_exception) {
-			 this.report_uncaught(error);
-		 }
-	 };
- 
-	 RemoteContext.prototype.report_uncaught = function(error) {
-		 var message = error.message || String(error);
-		 var filename = (error.filename ? " " + error.filename: "");
-		 // FIXME: Display remote error states separately from main document
-		 // error state.
-		 tests.set_status(tests.status.ERROR,
-						  "Error in remote" + filename + ": " + message,
-						  error.stack);
-	 };
- 
-	 RemoteContext.prototype.start = function(data) {
-		 this.started = true;
-		 this.allow_uncaught_exception = data.properties.allow_uncaught_exception;
- 
-		 if (this.early_exception && !this.allow_uncaught_exception) {
-			 this.report_uncaught(this.early_exception);
-		 }
-	 };
- 
-	 RemoteContext.prototype.test_state = function(data) {
-		 var remote_test = this.tests[data.test.index];
-		 if (!remote_test) {
-			 remote_test = new RemoteTest(data.test);
-			 this.tests[data.test.index] = remote_test;
-		 }
-		 remote_test.update_state_from(data.test);
-		 tests.notify_test_state(remote_test);
-	 };
- 
-	 RemoteContext.prototype.test_done = function(data) {
-		 var remote_test = this.tests[data.test.index];
-		 remote_test.update_state_from(data.test);
-		 remote_test.done();
-		 tests.result(remote_test);
-	 };
- 
-	 RemoteContext.prototype.remote_done = function(data) {
-		 if (tests.status.status === null &&
-			 data.status.status !== data.status.OK) {
-			 tests.set_status(data.status.status, data.status.message, data.status.stack);
-		 }
- 
-		 for (let assert of data.asserts) {
-			 var record = new AssertRecord();
-			 record.assert_name = assert.assert_name;
-			 record.args = assert.args;
-			 record.test = assert.test != null ? this.tests[assert.test.index] : null;
-			 record.status = assert.status;
-			 record.stack = assert.stack;
-			 tests.asserts_run.push(record);
-		 }
- 
-		 this.message_target.removeEventListener("message", this.message_handler);
-		 this.running = false;
- 
-		 // If remote context is cross origin assigning to onerror is not
-		 // possible, so silently catch those errors.
-		 try {
-		   this.remote.onerror = null;
-		 } catch (e) {
-		   // Ignore.
-		 }
- 
-		 this.remote = null;
-		 this.message_target = null;
-		 if (this.doneResolve) {
-			 this.doneResolve();
-		 }
- 
-		 if (tests.all_done()) {
-			 tests.complete();
-		 }
-	 };
- 
-	 RemoteContext.prototype.message_handlers = {
-		 start: RemoteContext.prototype.start,
-		 test_state: RemoteContext.prototype.test_state,
-		 result: RemoteContext.prototype.test_done,
-		 complete: RemoteContext.prototype.remote_done
-	 };
- 
-	 /**
-	  * @class
-	  * Status of the overall harness
-	  */
-	 function TestsStatus()
-	 {
-		 /** The status code */
-		 this.status = null;
-		 /** Message in case of failure */
-		 this.message = null;
-		 /** Stack trace in case of an exception. */
-		 this.stack = null;
-	 }
- 
-	 /**
-	  * Enum of possible harness statuses.
-	  *
-	  * :values:
-	  *   - ``OK``
-	  *   - ``ERROR``
-	  *   - ``TIMEOUT``
-	  *   - ``PRECONDITION_FAILED``
-	  */
-	 TestsStatus.statuses = {
-		 OK:0,
-		 ERROR:1,
-		 TIMEOUT:2,
-		 PRECONDITION_FAILED:3
-	 };
- 
-	 TestsStatus.prototype = merge({}, TestsStatus.statuses);
- 
-	 TestsStatus.prototype.formats = {
-		 0: "OK",
-		 1: "Error",
-		 2: "Timeout",
-		 3: "Optional Feature Unsupported"
-	 };
- 
-	 TestsStatus.prototype.structured_clone = function()
-	 {
-		 if (!this._structured_clone) {
-			 var msg = this.message;
-			 msg = msg ? String(msg) : msg;
-			 this._structured_clone = merge({
-				 status:this.status,
-				 message:msg,
-				 stack:this.stack
-			 }, TestsStatus.statuses);
-		 }
-		 return this._structured_clone;
-	 };
- 
-	 TestsStatus.prototype.format_status = function() {
-		 return this.formats[this.status];
-	 };
- 
-	 /**
-	  * @class
-	  * Record of an assert that ran.
-	  *
-	  * @param {Test} test - The test which ran the assert.
-	  * @param {string} assert_name - The function name of the assert.
-	  * @param {Any} args - The arguments passed to the assert function.
-	  */
-	 function AssertRecord(test, assert_name, args = []) {
-		 /** Name of the assert that ran */
-		 this.assert_name = assert_name;
-		 /** Test that ran the assert */
-		 this.test = test;
-		 // Avoid keeping complex objects alive
-		 /** Stringification of the arguments that were passed to the assert function */
-		 this.args = args.map(x => format_value(x).replace(/\n/g, " "));
-		 /** Status of the assert */
-		 this.status = null;
-	 }
- 
-	 AssertRecord.prototype.structured_clone = function() {
-		 return {
-			 assert_name: this.assert_name,
-			 test: this.test ? this.test.structured_clone() : null,
-			 args: this.args,
-			 status: this.status,
-		 };
-	 };
- 
-	 function Tests()
-	 {
-		 this.tests = [];
-		 this.num_pending = 0;
- 
-		 this.phases = {
-			 INITIAL:0,
-			 SETUP:1,
-			 HAVE_TESTS:2,
-			 HAVE_RESULTS:3,
-			 COMPLETE:4
-		 };
-		 this.phase = this.phases.INITIAL;
- 
-		 this.properties = {};
- 
-		 this.wait_for_finish = false;
-		 this.processing_callbacks = false;
- 
-		 this.allow_uncaught_exception = false;
- 
-		 this.file_is_test = false;
-		 // This value is lazily initialized in order to avoid introducing a
-		 // dependency on ECMAScript 2015 Promises to all tests.
-		 this.promise_tests = null;
-		 this.promise_setup_called = false;
- 
-		 this.timeout_multiplier = 1;
-		 this.timeout_length = test_environment.test_timeout();
-		 this.timeout_id = null;
- 
-		 this.start_callbacks = [];
-		 this.test_state_callbacks = [];
-		 this.test_done_callbacks = [];
-		 this.all_done_callbacks = [];
- 
-		 this.hide_test_state = false;
-		 this.pending_remotes = [];
- 
-		 this.current_test = null;
-		 this.asserts_run = [];
- 
-		 // Track whether output is enabled, and thus whether or not we should
-		 // track asserts.
-		 //
-		 // On workers we don't get properties set from testharnessreport.js, so
-		 // we don't know whether or not to track asserts. To avoid the
-		 // resulting performance hit, we assume we are not meant to. This means
-		 // that assert tracking does not function on workers.
-		 this.output = settings.output && 'document' in global_scope;
- 
-		 this.status = new TestsStatus();
- 
-		 var this_obj = this;
- 
-		 test_environment.add_on_loaded_callback(function() {
-			 if (this_obj.all_done()) {
-				 this_obj.complete();
-			 }
-		 });
- 
-		 this.set_timeout();
-	 }
- 
-	 Tests.prototype.setup = function(func, properties)
-	 {
-		 if (this.phase >= this.phases.HAVE_RESULTS) {
-			 return;
-		 }
- 
-		 if (this.phase < this.phases.SETUP) {
-			 this.phase = this.phases.SETUP;
-		 }
- 
-		 this.properties = properties;
- 
-		 for (var p in properties) {
-			 if (properties.hasOwnProperty(p)) {
-				 var value = properties[p];
-				 if (p == "allow_uncaught_exception") {
-					 this.allow_uncaught_exception = value;
-				 } else if (p == "explicit_done" && value) {
-					 this.wait_for_finish = true;
-				 } else if (p == "explicit_timeout" && value) {
-					 this.timeout_length = null;
-					 if (this.timeout_id)
-					 {
-						 clearTimeout(this.timeout_id);
-					 }
-				 } else if (p == "single_test" && value) {
-					 this.set_file_is_test();
-				 } else if (p == "timeout_multiplier") {
-					 this.timeout_multiplier = value;
-					 if (this.timeout_length) {
-						  this.timeout_length *= this.timeout_multiplier;
-					 }
-				 } else if (p == "hide_test_state") {
-					 this.hide_test_state = value;
-				 } else if (p == "output") {
-					 this.output = value;
-				 } else if (p === "debug") {
-					 settings.debug = value;
-				 }
-			 }
-		 }
- 
-		 if (func) {
-			 try {
-				 func();
-			 } catch (e) {
-				 this.status.status = e instanceof OptionalFeatureUnsupportedError ? this.status.PRECONDITION_FAILED : this.status.ERROR;
-				 this.status.message = String(e);
-				 this.status.stack = e.stack ? e.stack : null;
-				 this.complete();
-			 }
-		 }
-		 this.set_timeout();
-	 };
- 
-	 Tests.prototype.set_file_is_test = function() {
-		 if (this.tests.length > 0) {
-			 throw new Error("Tried to set file as test after creating a test");
-		 }
-		 this.wait_for_finish = true;
-		 this.file_is_test = true;
-		 // Create the test, which will add it to the list of tests
-		 tests.current_test = async_test();
-	 };
- 
-	 Tests.prototype.set_status = function(status, message, stack)
-	 {
-		 this.status.status = status;
-		 this.status.message = message;
-		 this.status.stack = stack ? stack : null;
-	 };
- 
-	 Tests.prototype.set_timeout = function() {
-		 if (global_scope.clearTimeout) {
-			 var this_obj = this;
-			 clearTimeout(this.timeout_id);
-			 if (this.timeout_length !== null) {
-				 this.timeout_id = setTimeout(function() {
-												  this_obj.timeout();
-											  }, this.timeout_length);
-			 }
-		 }
-	 };
- 
-	 Tests.prototype.timeout = function() {
-		 var test_in_cleanup = null;
- 
-		 if (this.status.status === null) {
-			 forEach(this.tests,
-					 function(test) {
-						 // No more than one test is expected to be in the
-						 // "CLEANUP" phase at any time
-						 if (test.phase === test.phases.CLEANING) {
-							 test_in_cleanup = test;
-						 }
- 
-						 test.phase = test.phases.COMPLETE;
-					 });
- 
-			 // Timeouts that occur while a test is in the "cleanup" phase
-			 // indicate that some global state was not properly reverted. This
-			 // invalidates the overall test execution, so the timeout should be
-			 // reported as an error and cancel the execution of any remaining
-			 // tests.
-			 if (test_in_cleanup) {
-				 this.status.status = this.status.ERROR;
-				 this.status.message = "Timeout while running cleanup for " +
-					 "test named \"" + test_in_cleanup.name + "\".";
-				 tests.status.stack = null;
-			 } else {
-				 this.status.status = this.status.TIMEOUT;
-			 }
-		 }
- 
-		 this.complete();
-	 };
- 
-	 Tests.prototype.end_wait = function()
-	 {
-		 this.wait_for_finish = false;
-		 if (this.all_done()) {
-			 this.complete();
-		 }
-	 };
- 
-	 Tests.prototype.push = function(test)
-	 {
-		 if (this.phase < this.phases.HAVE_TESTS) {
-			 this.start();
-		 }
-		 this.num_pending++;
-		 test.index = this.tests.push(test);
-		 this.notify_test_state(test);
-	 };
- 
-	 Tests.prototype.notify_test_state = function(test) {
-		 var this_obj = this;
-		 forEach(this.test_state_callbacks,
-				 function(callback) {
-					 callback(test, this_obj);
-				 });
-	 };
- 
-	 Tests.prototype.all_done = function() {
-		 return (this.tests.length > 0 || this.pending_remotes.length > 0) &&
-				 test_environment.all_loaded &&
-				 (this.num_pending === 0 || this.is_aborted) && !this.wait_for_finish &&
-				 !this.processing_callbacks &&
-				 !this.pending_remotes.some(function(w) { return w.running; });
-	 };
- 
-	 Tests.prototype.start = function() {
-		 this.phase = this.phases.HAVE_TESTS;
-		 this.notify_start();
-	 };
- 
-	 Tests.prototype.notify_start = function() {
-		 var this_obj = this;
-		 forEach (this.start_callbacks,
-				  function(callback)
-				  {
-					  callback(this_obj.properties);
-				  });
-	 };
- 
-	 Tests.prototype.result = function(test)
-	 {
-		 // If the harness has already transitioned beyond the `HAVE_RESULTS`
-		 // phase, subsequent tests should not cause it to revert.
-		 if (this.phase <= this.phases.HAVE_RESULTS) {
-			 this.phase = this.phases.HAVE_RESULTS;
-		 }
-		 this.num_pending--;
-		 this.notify_result(test);
-	 };
- 
-	 Tests.prototype.notify_result = function(test) {
-		 var this_obj = this;
-		 this.processing_callbacks = true;
-		 forEach(this.test_done_callbacks,
-				 function(callback)
-				 {
-					 callback(test, this_obj);
-				 });
-		 this.processing_callbacks = false;
-		 if (this_obj.all_done()) {
-			 this_obj.complete();
-		 }
-	 };
- 
-	 Tests.prototype.complete = function() {
-		 if (this.phase === this.phases.COMPLETE) {
-			 return;
-		 }
-		 var this_obj = this;
-		 var all_complete = function() {
-			 this_obj.phase = this_obj.phases.COMPLETE;
-			 this_obj.notify_complete();
-		 };
-		 var incomplete = filter(this.tests,
-								 function(test) {
-									 return test.phase < test.phases.COMPLETE;
-								 });
- 
-		 /**
-		  * To preserve legacy behavior, overall test completion must be
-		  * signaled synchronously.
-		  */
-		 if (incomplete.length === 0) {
-			 all_complete();
-			 return;
-		 }
- 
-		 all_async(incomplete,
-				   function(test, testDone)
-				   {
-					   if (test.phase === test.phases.INITIAL) {
-						   test.phase = test.phases.COMPLETE;
-						   testDone();
-					   } else {
-						   add_test_done_callback(test, testDone);
-						   test.cleanup();
-					   }
-				   },
-				   all_complete);
-	 };
- 
-	 Tests.prototype.set_assert = function(assert_name, args) {
-		 this.asserts_run.push(new AssertRecord(this.current_test, assert_name, args))
-	 }
- 
-	 Tests.prototype.set_assert_status = function(status, stack) {
-		 let assert_record = this.asserts_run[this.asserts_run.length - 1];
-		 assert_record.status = status;
-		 assert_record.stack = stack;
-	 }
- 
-	 /**
-	  * Update the harness status to reflect an unrecoverable harness error that
-	  * should cancel all further testing. Update all previously-defined tests
-	  * which have not yet started to indicate that they will not be executed.
-	  */
-	 Tests.prototype.abort = function() {
-		 this.status.status = this.status.ERROR;
-		 this.is_aborted = true;
- 
-		 forEach(this.tests,
-				 function(test) {
-					 if (test.phase === test.phases.INITIAL) {
-						 test.phase = test.phases.COMPLETE;
-					 }
-				 });
-	 };
- 
-	 /*
-	  * Determine if any tests share the same `name` property. Return an array
-	  * containing the names of any such duplicates.
-	  */
-	 Tests.prototype.find_duplicates = function() {
-		 var names = Object.create(null);
-		 var duplicates = [];
- 
-		 forEach (this.tests,
-				  function(test)
-				  {
-					  if (test.name in names && duplicates.indexOf(test.name) === -1) {
-						 duplicates.push(test.name);
-					  }
-					  names[test.name] = true;
-				  });
- 
-		 return duplicates;
-	 };
- 
-	 function code_unit_str(char) {
-		 return 'U+' + char.charCodeAt(0).toString(16);
-	 }
- 
-	 function sanitize_unpaired_surrogates(str) {
-		 return str.replace(
-			 /([\ud800-\udbff]+)(?![\udc00-\udfff])|(^|[^\ud800-\udbff])([\udc00-\udfff]+)/g,
-			 function(_, low, prefix, high) {
-				 var output = prefix || "";  // prefix may be undefined
-				 var string = low || high;  // only one of these alternates can match
-				 for (var i = 0; i < string.length; i++) {
-					 output += code_unit_str(string[i]);
-				 }
-				 return output;
-			 });
-	 }
- 
-	 function sanitize_all_unpaired_surrogates(tests) {
-		 forEach (tests,
-				  function (test)
-				  {
-					  var sanitized = sanitize_unpaired_surrogates(test.name);
- 
-					  if (test.name !== sanitized) {
-						  test.name = sanitized;
-						  delete test._structured_clone;
-					  }
-				  });
-	 }
- 
-	 Tests.prototype.notify_complete = function() {
-		 var this_obj = this;
-		 var duplicates;
- 
-		 if (this.status.status === null) {
-			 duplicates = this.find_duplicates();
- 
-			 // Some transports adhere to UTF-8's restriction on unpaired
-			 // surrogates. Sanitize the titles so that the results can be
-			 // consistently sent via all transports.
-			 sanitize_all_unpaired_surrogates(this.tests);
- 
-			 // Test names are presumed to be unique within test files--this
-			 // allows consumers to use them for identification purposes.
-			 // Duplicated names violate this expectation and should therefore
-			 // be reported as an error.
-			 if (duplicates.length) {
-				 this.status.status = this.status.ERROR;
-				 this.status.message =
-					duplicates.length + ' duplicate test name' +
-					(duplicates.length > 1 ? 's' : '') + ': "' +
-					duplicates.join('", "') + '"';
-			 } else {
-				 this.status.status = this.status.OK;
-			 }
-		 }
- 
-		 forEach (this.all_done_callbacks,
-				  function(callback)
-				  {
-					  callback(this_obj.tests, this_obj.status, this_obj.asserts_run);
-				  });
-	 };
- 
-	 /*
-	  * Constructs a RemoteContext that tracks tests from a specific worker.
-	  */
-	 Tests.prototype.create_remote_worker = function(worker) {
-		 var message_port;
- 
-		 if (is_service_worker(worker)) {
-			 message_port = navigator.serviceWorker;
-			 worker.postMessage({type: "connect"});
-		 } else if (is_shared_worker(worker)) {
-			 message_port = worker.port;
-			 message_port.start();
-		 } else {
-			 message_port = worker;
-		 }
- 
-		 return new RemoteContext(worker, message_port);
-	 };
- 
-	 /*
-	  * Constructs a RemoteContext that tracks tests from a specific window.
-	  */
-	 Tests.prototype.create_remote_window = function(remote) {
-		 remote.postMessage({type: "getmessages"}, "*");
-		 return new RemoteContext(
-			 remote,
-			 window,
-			 function(msg) {
-				 return msg.source === remote;
-			 }
-		 );
-	 };
- 
-	 Tests.prototype.fetch_tests_from_worker = function(worker) {
-		 if (this.phase >= this.phases.COMPLETE) {
-			 return;
-		 }
- 
-		 var remoteContext = this.create_remote_worker(worker);
-		 this.pending_remotes.push(remoteContext);
-		 return remoteContext.done;
-	 };
- 
-	 /**
-	  * Get test results from a worker and include them in the current test.
-	  *
-	  * @param {Worker|SharedWorker|ServiceWorker|MessagePort} port -
-	  * Either a worker object or a port connected to a worker which is
-	  * running tests..
-	  * @returns {Promise} - A promise that's resolved once all the remote tests are complete.
-	  */
-	 function fetch_tests_from_worker(port) {
-		 return tests.fetch_tests_from_worker(port);
-	 }
-	 expose(fetch_tests_from_worker, 'fetch_tests_from_worker');
- 
-	 Tests.prototype.fetch_tests_from_window = function(remote) {
-		 if (this.phase >= this.phases.COMPLETE) {
-			 return;
-		 }
- 
-		 this.pending_remotes.push(this.create_remote_window(remote));
-	 };
- 
-	 /**
-	  * Aggregate tests from separate windows or iframes
-	  * into the current document as if they were all part of the same test file.
-	  *
-	  * The document of the second window (or iframe) should include
-	  * ``testharness.js``, but not ``testharnessreport.js``, and use
-	  * :js:func:`test`, :js:func:`async_test`, and :js:func:`promise_test` in
-	  * the usual manner.
-	  *
-	  * @param {Window} window - The window to fetch tests from.
-	  */
-	 function fetch_tests_from_window(window) {
-		 tests.fetch_tests_from_window(window);
-	 }
-	 expose(fetch_tests_from_window, 'fetch_tests_from_window');
- 
-	 /**
-	  * Get test results from a shadow realm and include them in the current test.
-	  *
-	  * @param {ShadowRealm} realm - A shadow realm also running the test harness
-	  * @returns {Promise} - A promise that's resolved once all the remote tests are complete.
-	  */
-	 function fetch_tests_from_shadow_realm(realm) {
-		 var chan = new MessageChannel();
-		 function receiveMessage(msg_json) {
-			 chan.port1.postMessage(JSON.parse(msg_json));
-		 }
-		 var done = tests.fetch_tests_from_worker(chan.port2);
-		 realm.evaluate("begin_shadow_realm_tests")(receiveMessage);
-		 chan.port2.start();
-		 return done;
-	 }
-	 expose(fetch_tests_from_shadow_realm, 'fetch_tests_from_shadow_realm');
- 
-	 /**
-	  * Begin running tests in this shadow realm test harness.
-	  *
-	  * To be called after all tests have been loaded; it is an error to call
-	  * this more than once or in a non-Shadow Realm environment
-	  *
-	  * @param {Function} postMessage - A function to send test updates to the
-	  * incubating realm-- accepts JSON-encoded messages in the format used by
-	  * RemoteContext
-	  */
-	 function begin_shadow_realm_tests(postMessage) {
-		 if (!(test_environment instanceof ShadowRealmTestEnvironment)) {
-			 throw new Error("beign_shadow_realm_tests called in non-Shadow Realm environment");
-		 }
- 
-		 test_environment.begin(function (msg) {
-			 postMessage(JSON.stringify(msg));
-		 });
-	 }
-	 expose(begin_shadow_realm_tests, 'begin_shadow_realm_tests');
- 
-	 /**
-	  * Timeout the tests.
-	  *
-	  * This only has an effect when ``explict_timeout`` has been set
-	  * in :js:func:`setup`. In other cases any call is a no-op.
-	  *
-	  */
-	 function timeout() {
-		 if (tests.timeout_length === null) {
-			 tests.timeout();
-		 }
-	 }
-	 expose(timeout, 'timeout');
- 
-	 /**
-	  * Add a callback that's triggered when the first :js:class:`Test` is created.
-	  *
-	  * @param {Function} callback - Callback function. This is called
-	  * without arguments.
-	  */
-	 function add_start_callback(callback) {
-		 tests.start_callbacks.push(callback);
-	 }
- 
-	 /**
-	  * Add a callback that's triggered when a test state changes.
-	  *
-	  * @param {Function} callback - Callback function, called with the
-	  * :js:class:`Test` as the only argument.
-	  */
-	 function add_test_state_callback(callback) {
-		 tests.test_state_callbacks.push(callback);
-	 }
- 
-	 /**
-	  * Add a callback that's triggered when a test result is received.
-	  *
-	  * @param {Function} callback - Callback function, called with the
-	  * :js:class:`Test` as the only argument.
-	  */
-	 function add_result_callback(callback) {
-		 tests.test_done_callbacks.push(callback);
-	 }
- 
-	 /**
-	  * Add a callback that's triggered when all tests are complete.
-	  *
-	  * @param {Function} callback - Callback function, called with an
-	  * array of :js:class:`Test` objects, a :js:class:`TestsStatus`
-	  * object and an array of :js:class:`AssertRecord` objects. If the
-	  * debug setting is ``false`` the final argument will be an empty
-	  * array.
-	  *
-	  * For performance reasons asserts are only tracked when the debug
-	  * setting is ``true``. In other cases the array of asserts will be
-	  * empty.
-	  */
-	 function add_completion_callback(callback) {
-		 tests.all_done_callbacks.push(callback);
-	 }
- 
-	 expose(add_start_callback, 'add_start_callback');
-	 expose(add_test_state_callback, 'add_test_state_callback');
-	 expose(add_result_callback, 'add_result_callback');
-	 expose(add_completion_callback, 'add_completion_callback');
- 
-	 function remove(array, item) {
-		 var index = array.indexOf(item);
-		 if (index > -1) {
-			 array.splice(index, 1);
-		 }
-	 }
- 
-	 function remove_start_callback(callback) {
-		 remove(tests.start_callbacks, callback);
-	 }
- 
-	 function remove_test_state_callback(callback) {
-		 remove(tests.test_state_callbacks, callback);
-	 }
- 
-	 function remove_result_callback(callback) {
-		 remove(tests.test_done_callbacks, callback);
-	 }
- 
-	 function remove_completion_callback(callback) {
-		remove(tests.all_done_callbacks, callback);
-	 }
- 
-	 /*
-	  * Output listener
-	 */
- 
-	 function Output() {
-		 this.output_document = document;
-		 this.output_node = null;
-		 this.enabled = settings.output;
-		 this.phase = this.INITIAL;
-	 }
- 
-	 Output.prototype.INITIAL = 0;
-	 Output.prototype.STARTED = 1;
-	 Output.prototype.HAVE_RESULTS = 2;
-	 Output.prototype.COMPLETE = 3;
- 
-	 Output.prototype.setup = function(properties) {
-		 if (this.phase > this.INITIAL) {
-			 return;
-		 }
- 
-		 //If output is disabled in testharnessreport.js the test shouldn't be
-		 //able to override that
-		 this.enabled = this.enabled && (properties.hasOwnProperty("output") ?
-										 properties.output : settings.output);
-	 };
- 
-	 Output.prototype.init = function(properties) {
-		 if (this.phase >= this.STARTED) {
-			 return;
-		 }
-		 if (properties.output_document) {
-			 this.output_document = properties.output_document;
-		 } else {
-			 this.output_document = document;
-		 }
-		 this.phase = this.STARTED;
-	 };
- 
-	 Output.prototype.resolve_log = function() {
-		 var output_document;
-		 if (this.output_node) {
-			 return;
-		 }
-		 if (typeof this.output_document === "function") {
-			 output_document = this.output_document.apply(undefined);
-		 } else {
-			 output_document = this.output_document;
-		 }
-		 if (!output_document) {
-			 return;
-		 }
-		 var node = output_document.getElementById("log");
-		 if (!node) {
-			 if (output_document.readyState === "loading") {
-				 return;
-			 }
-			 node = output_document.createElementNS("http://www.w3.org/1999/xhtml", "div");
-			 node.id = "log";
-			 if (output_document.body) {
-				 output_document.body.appendChild(node);
-			 } else {
-				 var root = output_document.documentElement;
-				 var is_html = (root &&
-								root.namespaceURI == "http://www.w3.org/1999/xhtml" &&
-								root.localName == "html");
-				 var is_svg = (output_document.defaultView &&
-							   "SVGSVGElement" in output_document.defaultView &&
-							   root instanceof output_document.defaultView.SVGSVGElement);
-				 if (is_svg) {
-					 var foreignObject = output_document.createElementNS("http://www.w3.org/2000/svg", "foreignObject");
-					 foreignObject.setAttribute("width", "100%");
-					 foreignObject.setAttribute("height", "100%");
-					 root.appendChild(foreignObject);
-					 foreignObject.appendChild(node);
-				 } else if (is_html) {
-					 root.appendChild(output_document.createElementNS("http://www.w3.org/1999/xhtml", "body"))
-						 .appendChild(node);
-				 } else {
-					 root.appendChild(node);
-				 }
-			 }
-		 }
-		 this.output_document = output_document;
-		 this.output_node = node;
-	 };
- 
-	 Output.prototype.show_status = function() {
-		 if (this.phase < this.STARTED) {
-			 this.init({});
-		 }
-		 if (!this.enabled || this.phase === this.COMPLETE) {
-			 return;
-		 }
-		 this.resolve_log();
-		 if (this.phase < this.HAVE_RESULTS) {
-			 this.phase = this.HAVE_RESULTS;
-		 }
-		 var done_count = tests.tests.length - tests.num_pending;
-		 if (this.output_node && !tests.hide_test_state) {
-			 if (done_count < 100 ||
-				 (done_count < 1000 && done_count % 100 === 0) ||
-				 done_count % 1000 === 0) {
-				 this.output_node.textContent = "Running, " +
-					 done_count + " complete, " +
-					 tests.num_pending + " remain";
-			 }
-		 }
-	 };
- 
-	 Output.prototype.show_results = function (tests, harness_status, asserts_run) {
-		 if (this.phase >= this.COMPLETE) {
-			 return;
-		 }
-		 if (!this.enabled) {
-			 return;
-		 }
-		 if (!this.output_node) {
-			 this.resolve_log();
-		 }
-		 this.phase = this.COMPLETE;
- 
-		 var log = this.output_node;
-		 if (!log) {
-			 return;
-		 }
-		 var output_document = this.output_document;
- 
-		 while (log.lastChild) {
-			 log.removeChild(log.lastChild);
-		 }
- 
-		 var stylesheet = output_document.createElementNS(xhtml_ns, "style");
-		 stylesheet.textContent = stylesheetContent;
-		 var heads = output_document.getElementsByTagName("head");
-		 if (heads.length) {
-			 heads[0].appendChild(stylesheet);
-		 }
- 
-		 var status_number = {};
-		 forEach(tests,
-				 function(test) {
-					 var status = test.format_status();
-					 if (status_number.hasOwnProperty(status)) {
-						 status_number[status] += 1;
-					 } else {
-						 status_number[status] = 1;
-					 }
-				 });
- 
-		 function status_class(status)
-		 {
-			 return status.replace(/\s/g, '').toLowerCase();
-		 }
- 
-		 var summary_template = ["section", {"id":"summary"},
-								 ["h2", {}, "Summary"],
-								 function()
-								 {
-									 var status = harness_status.format_status();
-									 var rv = [["section", {},
-												["p", {},
-												 "Harness status: ",
-												 ["span", {"class":status_class(status)},
-												  status
-												 ],
-												],
-												["button",
-												 {"onclick": "let evt = new Event('__test_restart'); " +
-												  "let canceled = !window.dispatchEvent(evt);" +
-												  "if (!canceled) { location.reload() }"},
-												 "Rerun"]
-											   ]];
- 
-									 if (harness_status.status === harness_status.ERROR) {
-										 rv[0].push(["pre", {}, harness_status.message]);
-										 if (harness_status.stack) {
-											 rv[0].push(["pre", {}, harness_status.stack]);
-										 }
-									 }
-									 return rv;
-								 },
-								 ["p", {}, "Found ${num_tests} tests"],
-								 function() {
-									 var rv = [["div", {}]];
-									 var i = 0;
-									 while (Test.prototype.status_formats.hasOwnProperty(i)) {
-										 if (status_number.hasOwnProperty(Test.prototype.status_formats[i])) {
-											 var status = Test.prototype.status_formats[i];
-											 rv[0].push(["div", {},
-														 ["label", {},
-														  ["input", {type:"checkbox", checked:"checked"}],
-														  status_number[status] + " ",
-														  ["span", {"class":status_class(status)}, status]]]);
-										 }
-										 i++;
-									 }
-									 return rv;
-								 },
-								];
- 
-		 log.appendChild(render(summary_template, {num_tests:tests.length}, output_document));
- 
-		 forEach(output_document.querySelectorAll("section#summary label"),
-				 function(element)
-				 {
-					 on_event(element, "click",
-							  function(e)
-							  {
-								  if (output_document.getElementById("results") === null) {
-									  e.preventDefault();
-									  return;
-								  }
-								  var result_class = element.querySelector("span[class]").getAttribute("class");
-								  var style_element = output_document.querySelector("style#hide-" + result_class);
-								  var input_element = element.querySelector("input");
-								  if (!style_element && !input_element.checked) {
-									  style_element = output_document.createElementNS(xhtml_ns, "style");
-									  style_element.id = "hide-" + result_class;
-									  style_element.textContent = "table#results > tbody > tr.overall-"+result_class+"{display:none}";
-									  output_document.body.appendChild(style_element);
-								  } else if (style_element && input_element.checked) {
-									  style_element.parentNode.removeChild(style_element);
-								  }
-							  });
-				 });
- 
-		 // This use of innerHTML plus manual escaping is not recommended in
-		 // general, but is necessary here for performance.  Using textContent
-		 // on each individual <td> adds tens of seconds of execution time for
-		 // large test suites (tens of thousands of tests).
-		 function escape_html(s)
-		 {
-			 return s.replace(/\&/g, "&amp;")
-				 .replace(/</g, "&lt;")
-				 .replace(/"/g, "&quot;")
-				 .replace(/'/g, "&#39;");
-		 }
- 
-		 function has_assertions()
-		 {
-			 for (var i = 0; i < tests.length; i++) {
-				 if (tests[i].properties.hasOwnProperty("assert")) {
-					 return true;
-				 }
-			 }
-			 return false;
-		 }
- 
-		 function get_assertion(test)
-		 {
-			 if (test.properties.hasOwnProperty("assert")) {
-				 if (Array.isArray(test.properties.assert)) {
-					 return test.properties.assert.join(' ');
-				 }
-				 return test.properties.assert;
-			 }
-			 return '';
-		 }
- 
-		 var asserts_run_by_test = new Map();
-		 asserts_run.forEach(assert => {
-			 if (!asserts_run_by_test.has(assert.test)) {
-				 asserts_run_by_test.set(assert.test, []);
-			 }
-			 asserts_run_by_test.get(assert.test).push(assert);
-		 });
- 
-		 function get_asserts_output(test) {
-			 var asserts = asserts_run_by_test.get(test);
-			 if (!asserts) {
-				 return "No asserts ran";
-			 }
-			 rv = "<table>";
-			 rv += asserts.map(assert => {
-				 var output_fn = "<strong>" + escape_html(assert.assert_name) + "</strong>(";
-				 var prefix_len = output_fn.length;
-				 var output_args = assert.args;
-				 var output_len = output_args.reduce((prev, current) => prev+current, prefix_len);
-				 if (output_len[output_len.length - 1] > 50) {
-					 output_args = output_args.map((x, i) =>
-					 (i > 0 ? "  ".repeat(prefix_len) : "" )+ x + (i < output_args.length - 1 ? ",\n" : ""));
-				 } else {
-					 output_args = output_args.map((x, i) => x + (i < output_args.length - 1 ? ", " : ""));
-				 }
-				 output_fn += escape_html(output_args.join(""));
-				 output_fn += ')';
-				 var output_location;
-				 if (assert.stack) {
-					 output_location = assert.stack.split("\n", 1)[0].replace(/@?\w+:\/\/[^ "\/]+(?::\d+)?/g, " ");
-				 }
-				 return "<tr class='overall-" +
-					 status_class(Test.prototype.status_formats[assert.status]) + "'>" +
-					 "<td class='" +
-					 status_class(Test.prototype.status_formats[assert.status]) + "'>" +
-					 Test.prototype.status_formats[assert.status] + "</td>" +
-					 "<td><pre>" +
-					 output_fn +
-					 (output_location ? "\n" + escape_html(output_location) : "") +
-					 "</pre></td></tr>";
-			 }
-			 ).join("\n");
-			 rv += "</table>";
-			 return rv;
-		 }
- 
-		 log.appendChild(document.createElementNS(xhtml_ns, "section"));
-		 var assertions = has_assertions();
-		 var html = "<h2>Details</h2><table id='results' " + (assertions ? "class='assertions'" : "" ) + ">" +
-			 "<thead><tr><th>Result</th><th>Test Name</th>" +
-			 (assertions ? "<th>Assertion</th>" : "") +
-			 "<th>Message</th></tr></thead>" +
-			 "<tbody>";
-		 for (var i = 0; i < tests.length; i++) {
-			 var test = tests[i];
-			 html += '<tr class="overall-' +
-				 status_class(test.format_status()) +
-				 '">' +
-				 '<td class="' +
-				 status_class(test.format_status()) +
-				 '">' +
-				 test.format_status() +
-				 "</td><td>" +
-				 escape_html(test.name) +
-				 "</td><td>" +
-				 (assertions ? escape_html(get_assertion(test)) + "</td><td>" : "") +
-				 escape_html(test.message ? tests[i].message : " ") +
-				 (tests[i].stack ? "<pre>" +
-				  escape_html(tests[i].stack) +
-				  "</pre>": "");
-			 if (!(test instanceof RemoteTest)) {
-				  html += "<details><summary>Asserts run</summary>" + get_asserts_output(test) + "</details>"
-			 }
-			 html += "</td></tr>";
-		 }
-		 html += "</tbody></table>";
-		 try {
-			 log.lastChild.innerHTML = html;
-		 } catch (e) {
-			 log.appendChild(document.createElementNS(xhtml_ns, "p"))
-				.textContent = "Setting innerHTML for the log threw an exception.";
-			 log.appendChild(document.createElementNS(xhtml_ns, "pre"))
-				.textContent = html;
-		 }
-	 };
- 
-	 /*
-	  * Template code
-	  *
-	  * A template is just a JavaScript structure. An element is represented as:
-	  *
-	  * [tag_name, {attr_name:attr_value}, child1, child2]
-	  *
-	  * the children can either be strings (which act like text nodes), other templates or
-	  * functions (see below)
-	  *
-	  * A text node is represented as
-	  *
-	  * ["{text}", value]
-	  *
-	  * String values have a simple substitution syntax; ${foo} represents a variable foo.
-	  *
-	  * It is possible to embed logic in templates by using a function in a place where a
-	  * node would usually go. The function must either return part of a template or null.
-	  *
-	  * In cases where a set of nodes are required as output rather than a single node
-	  * with children it is possible to just use a list
-	  * [node1, node2, node3]
-	  *
-	  * Usage:
-	  *
-	  * render(template, substitutions) - take a template and an object mapping
-	  * variable names to parameters and return either a DOM node or a list of DOM nodes
-	  *
-	  * substitute(template, substitutions) - take a template and variable mapping object,
-	  * make the variable substitutions and return the substituted template
-	  *
-	  */
- 
-	 function is_single_node(template)
-	 {
-		 return typeof template[0] === "string";
-	 }
- 
-	 function substitute(template, substitutions)
-	 {
-		 if (typeof template === "function") {
-			 var replacement = template(substitutions);
-			 if (!replacement) {
-				 return null;
-			 }
- 
-			 return substitute(replacement, substitutions);
-		 }
- 
-		 if (is_single_node(template)) {
-			 return substitute_single(template, substitutions);
-		 }
- 
-		 return filter(map(template, function(x) {
-							   return substitute(x, substitutions);
-						   }), function(x) {return x !== null;});
-	 }
- 
-	 function substitute_single(template, substitutions)
-	 {
-		 var substitution_re = /\$\{([^ }]*)\}/g;
- 
-		 function do_substitution(input) {
-			 var components = input.split(substitution_re);
-			 var rv = [];
-			 for (var i = 0; i < components.length; i += 2) {
-				 rv.push(components[i]);
-				 if (components[i + 1]) {
-					 rv.push(String(substitutions[components[i + 1]]));
-				 }
-			 }
-			 return rv;
-		 }
- 
-		 function substitute_attrs(attrs, rv)
-		 {
-			 rv[1] = {};
-			 for (var name in template[1]) {
-				 if (attrs.hasOwnProperty(name)) {
-					 var new_name = do_substitution(name).join("");
-					 var new_value = do_substitution(attrs[name]).join("");
-					 rv[1][new_name] = new_value;
-				 }
-			 }
-		 }
- 
-		 function substitute_children(children, rv)
-		 {
-			 for (var i = 0; i < children.length; i++) {
-				 if (children[i] instanceof Object) {
-					 var replacement = substitute(children[i], substitutions);
-					 if (replacement !== null) {
-						 if (is_single_node(replacement)) {
-							 rv.push(replacement);
-						 } else {
-							 extend(rv, replacement);
-						 }
-					 }
-				 } else {
-					 extend(rv, do_substitution(String(children[i])));
-				 }
-			 }
-			 return rv;
-		 }
- 
-		 var rv = [];
-		 rv.push(do_substitution(String(template[0])).join(""));
- 
-		 if (template[0] === "{text}") {
-			 substitute_children(template.slice(1), rv);
-		 } else {
-			 substitute_attrs(template[1], rv);
-			 substitute_children(template.slice(2), rv);
-		 }
- 
-		 return rv;
-	 }
- 
-	 function make_dom_single(template, doc)
-	 {
-		 var output_document = doc || document;
-		 var element;
-		 if (template[0] === "{text}") {
-			 element = output_document.createTextNode("");
-			 for (var i = 1; i < template.length; i++) {
-				 element.data += template[i];
-			 }
-		 } else {
-			 element = output_document.createElementNS(xhtml_ns, template[0]);
-			 for (var name in template[1]) {
-				 if (template[1].hasOwnProperty(name)) {
-					 element.setAttribute(name, template[1][name]);
-				 }
-			 }
-			 for (var i = 2; i < template.length; i++) {
-				 if (template[i] instanceof Object) {
-					 var sub_element = make_dom(template[i]);
-					 element.appendChild(sub_element);
-				 } else {
-					 var text_node = output_document.createTextNode(template[i]);
-					 element.appendChild(text_node);
-				 }
-			 }
-		 }
- 
-		 return element;
-	 }
- 
-	 function make_dom(template, substitutions, output_document)
-	 {
-		 if (is_single_node(template)) {
-			 return make_dom_single(template, output_document);
-		 }
- 
-		 return map(template, function(x) {
-						return make_dom_single(x, output_document);
-					});
-	 }
- 
-	 function render(template, substitutions, output_document)
-	 {
-		 return make_dom(substitute(template, substitutions), output_document);
-	 }
- 
-	 /*
-	  * Utility functions
-	  */
-	 function assert(expected_true, function_name, description, error, substitutions)
-	 {
-		 if (expected_true !== true) {
-			 var msg = make_message(function_name, description,
-									error, substitutions);
-			 throw new AssertionError(msg);
-		 }
-	 }
- 
-	 /**
-	  * @class
-	  * Exception type that represents a failing assert.
-	  *
-	  * @param {string} message - Error message.
-	  */
-	 function AssertionError(message)
-	 {
-		 if (typeof message == "string") {
-			 message = sanitize_unpaired_surrogates(message);
-		 }
-		 this.message = message;
-		 this.stack = get_stack();
-	 }
-	 expose(AssertionError, "AssertionError");
- 
-	 AssertionError.prototype = Object.create(Error.prototype);
- 
-	 const get_stack = function() {
-		 var stack = new Error().stack;
- 
-		 // 'Error.stack' is not supported in all browsers/versions
-		 if (!stack) {
-			 return "(Stack trace unavailable)";
-		 }
- 
-		 var lines = stack.split("\n");
- 
-		 // Create a pattern to match stack frames originating within testharness.js.  These include the
-		 // script URL, followed by the line/col (e.g., '/resources/testharness.js:120:21').
-		 // Escape the URL per http://stackoverflow.com/questions/3561493/is-there-a-regexp-escape-function-in-javascript
-		 // in case it contains RegExp characters.
-		 var script_url = get_script_url();
-		 var re_text = script_url ? script_url.replace(/[-\/\\^$*+?.()|[\]{}]/g, '\\$&') : "\\btestharness.js";
-		 var re = new RegExp(re_text + ":\\d+:\\d+");
- 
-		 // Some browsers include a preamble that specifies the type of the error object.  Skip this by
-		 // advancing until we find the first stack frame originating from testharness.js.
-		 var i = 0;
-		 while (!re.test(lines[i]) && i < lines.length) {
-			 i++;
-		 }
- 
-		 // Then skip the top frames originating from testharness.js to begin the stack at the test code.
-		 while (re.test(lines[i]) && i < lines.length) {
-			 i++;
-		 }
- 
-		 // Paranoid check that we didn't skip all frames.  If so, return the original stack unmodified.
-		 if (i >= lines.length) {
-			 return stack;
-		 }
- 
-		 return lines.slice(i).join("\n");
-	 }
- 
-	 function OptionalFeatureUnsupportedError(message)
-	 {
-		 AssertionError.call(this, message);
-	 }
-	 OptionalFeatureUnsupportedError.prototype = Object.create(AssertionError.prototype);
-	 expose(OptionalFeatureUnsupportedError, "OptionalFeatureUnsupportedError");
- 
-	 function make_message(function_name, description, error, substitutions)
-	 {
-		 for (var p in substitutions) {
-			 if (substitutions.hasOwnProperty(p)) {
-				 substitutions[p] = format_value(substitutions[p]);
-			 }
-		 }
-		 var node_form = substitute(["{text}", "${function_name}: ${description}" + error],
-									merge({function_name:function_name,
-										   description:(description?description + " ":"")},
-										   substitutions));
-		 return node_form.slice(1).join("");
-	 }
- 
-	 function filter(array, callable, thisObj) {
-		 var rv = [];
-		 for (var i = 0; i < array.length; i++) {
-			 if (array.hasOwnProperty(i)) {
-				 var pass = callable.call(thisObj, array[i], i, array);
-				 if (pass) {
-					 rv.push(array[i]);
-				 }
-			 }
-		 }
-		 return rv;
-	 }
- 
-	 function map(array, callable, thisObj)
-	 {
-		 var rv = [];
-		 rv.length = array.length;
-		 for (var i = 0; i < array.length; i++) {
-			 if (array.hasOwnProperty(i)) {
-				 rv[i] = callable.call(thisObj, array[i], i, array);
-			 }
-		 }
-		 return rv;
-	 }
- 
-	 function extend(array, items)
-	 {
-		 Array.prototype.push.apply(array, items);
-	 }
- 
-	 function forEach(array, callback, thisObj)
-	 {
-		 for (var i = 0; i < array.length; i++) {
-			 if (array.hasOwnProperty(i)) {
-				 callback.call(thisObj, array[i], i, array);
-			 }
-		 }
-	 }
- 
-	 /**
-	  * Immediately invoke a "iteratee" function with a series of values in
-	  * parallel and invoke a final "done" function when all of the "iteratee"
-	  * invocations have signaled completion.
-	  *
-	  * If all callbacks complete synchronously (or if no callbacks are
-	  * specified), the ``done_callback`` will be invoked synchronously. It is the
-	  * responsibility of the caller to ensure asynchronicity in cases where
-	  * that is desired.
-	  *
-	  * @param {array} value Zero or more values to use in the invocation of
-	  *                      ``iter_callback``
-	  * @param {function} iter_callback A function that will be invoked
-	  *                                 once for each of the values min
-	  *                                 ``value``. Two arguments will
-	  *                                 be available in each
-	  *                                 invocation: the value from
-	  *                                 ``value`` and a function that
-	  *                                 must be invoked to signal
-	  *                                 completion
-	  * @param {function} done_callback A function that will be invoked after
-	  *                                 all operations initiated by the
-	  *                                 ``iter_callback`` function have signaled
-	  *                                 completion
-	  */
-	 function all_async(values, iter_callback, done_callback)
-	 {
-		 var remaining = values.length;
- 
-		 if (remaining === 0) {
-			 done_callback();
-		 }
- 
-		 forEach(values,
-				 function(element) {
-					 var invoked = false;
-					 var elDone = function() {
-						 if (invoked) {
-							 return;
-						 }
- 
-						 invoked = true;
-						 remaining -= 1;
- 
-						 if (remaining === 0) {
-							 done_callback();
-						 }
-					 };
- 
-					 iter_callback(element, elDone);
-				 });
-	 }
- 
-	 function merge(a,b)
-	 {
-		 var rv = {};
-		 var p;
-		 for (p in a) {
-			 rv[p] = a[p];
-		 }
-		 for (p in b) {
-			 rv[p] = b[p];
-		 }
-		 return rv;
-	 }
- 
-	 function expose(object, name)
-	 {
-		 var components = name.split(".");
-		 var target = global_scope;
-		 for (var i = 0; i < components.length - 1; i++) {
-			 if (!(components[i] in target)) {
-				 target[components[i]] = {};
-			 }
-			 target = target[components[i]];
-		 }
-		 target[components[components.length - 1]] = object;
-	 }
- 
-	 function is_same_origin(w) {
-		 try {
-			 'random_prop' in w;
-			 return true;
-		 } catch (e) {
-			 return false;
-		 }
-	 }
- 
-	 /** Returns the 'src' URL of the first <script> tag in the page to include the file 'testharness.js'. */
-	 function get_script_url()
-	 {
-		 if (!('document' in global_scope)) {
-			 return undefined;
-		 }
- 
-		 var scripts = document.getElementsByTagName("script");
-		 for (var i = 0; i < scripts.length; i++) {
-			 var src;
-			 if (scripts[i].src) {
-				 src = scripts[i].src;
-			 } else if (scripts[i].href) {
-				 //SVG case
-				 src = scripts[i].href.baseVal;
-			 }
- 
-			 var matches = src && src.match(/^(.*\/|)testharness\.js$/);
-			 if (matches) {
-				 return src;
-			 }
-		 }
-		 return undefined;
-	 }
- 
-	 /** Returns the <title> or filename or "Untitled" */
-	 function get_title()
-	 {
-		 if ('document' in global_scope) {
-			 //Don't use document.title to work around an Opera/Presto bug in XHTML documents
-			 var title = document.getElementsByTagName("title")[0];
-			 if (title && title.firstChild && title.firstChild.data) {
-				 return title.firstChild.data;
-			 }
-		 }
-		 if ('META_TITLE' in global_scope && META_TITLE) {
-			 return META_TITLE;
-		 }
-		 if ('location' in global_scope) {
-			 return location.pathname.substring(location.pathname.lastIndexOf('/') + 1, location.pathname.indexOf('.'));
-		 }
-		 return "Untitled";
-	 }
- 
-	 /**
-	  * Setup globals
-	  */
- 
-	 var tests = new Tests();
- 
-	 if (global_scope.addEventListener) {
-		 var error_handler = function(error, message, stack) {
-			 var optional_unsupported = error instanceof OptionalFeatureUnsupportedError;
-			 if (tests.file_is_test) {
-				 var test = tests.tests[0];
-				 if (test.phase >= test.phases.HAS_RESULT) {
-					 return;
-				 }
-				 var status = optional_unsupported ? test.PRECONDITION_FAILED : test.FAIL;
-				 test.set_status(status, message, stack);
-				 test.phase = test.phases.HAS_RESULT;
-			 } else if (!tests.allow_uncaught_exception) {
-				 var status = optional_unsupported ? tests.status.PRECONDITION_FAILED : tests.status.ERROR;
-				 tests.status.status = status;
-				 tests.status.message = message;
-				 tests.status.stack = stack;
-			 }
- 
-			 // Do not transition to the "complete" phase if the test has been
-			 // configured to allow uncaught exceptions. This gives the test an
-			 // opportunity to define subtests based on the exception reporting
-			 // behavior.
-			 if (!tests.allow_uncaught_exception) {
-				 done();
-			 }
-		 };
- 
-		 addEventListener("error", function(e) {
-			 var message = e.message;
-			 var stack;
-			 if (e.error && e.error.stack) {
-				 stack = e.error.stack;
-			 } else {
-				 stack = e.filename + ":" + e.lineno + ":" + e.colno;
-			 }
-			 error_handler(e.error, message, stack);
-		 }, false);
- 
-		 addEventListener("unhandledrejection", function(e) {
-			 var message;
-			 if (e.reason && e.reason.message) {
-				 message = "Unhandled rejection: " + e.reason.message;
-			 } else {
-				 message = "Unhandled rejection";
-			 }
-			 var stack;
-			 if (e.reason && e.reason.stack) {
-				 stack = e.reason.stack;
-			 }
-			 error_handler(e.reason, message, stack);
-		 }, false);
-	 }
- 
-	 test_environment.on_tests_ready();
- 
-	 /**
-	  * Stylesheet
-	  */
-	  var stylesheetContent = "\
- html {\
-	 font-family:DejaVu Sans, Bitstream Vera Sans, Arial, Sans;\
- }\
- \
- #log .warning,\
- #log .warning a {\
-   color: black;\
-   background: yellow;\
- }\
- \
- #log .error,\
- #log .error a {\
-   color: white;\
-   background: red;\
- }\
- \
- section#summary {\
-	 margin-bottom:1em;\
- }\
- \
- table#results {\
-	 border-collapse:collapse;\
-	 table-layout:fixed;\
-	 width:100%;\
- }\
- \
- table#results > thead > tr > th:first-child,\
- table#results > tbody > tr > td:first-child {\
-	 width:8em;\
- }\
- \
- table#results > thead > tr > th:last-child,\
- table#results > thead > tr > td:last-child {\
-	 width:50%;\
- }\
- \
- table#results.assertions > thead > tr > th:last-child,\
- table#results.assertions > tbody > tr > td:last-child {\
-	 width:35%;\
- }\
- \
- table#results > thead > > tr > th {\
-	 padding:0;\
-	 padding-bottom:0.5em;\
-	 border-bottom:medium solid black;\
- }\
- \
- table#results > tbody > tr> td {\
-	 padding:1em;\
-	 padding-bottom:0.5em;\
-	 border-bottom:thin solid black;\
- }\
- \
- .pass {\
-	 color:green;\
- }\
- \
- .fail {\
-	 color:red;\
- }\
- \
- tr.timeout {\
-	 color:red;\
- }\
- \
- tr.notrun {\
-	 color:blue;\
- }\
- \
- tr.optionalunsupported {\
-	 color:blue;\
- }\
- \
- .ok {\
-	 color:green;\
- }\
- \
- .error {\
-	 color:red;\
- }\
- \
- .pass, .fail, .timeout, .notrun, .optionalunsupported .ok, .timeout, .error {\
-	 font-variant:small-caps;\
- }\
- \
- table#results span {\
-	 display:block;\
- }\
- \
- table#results span.expected {\
-	 font-family:DejaVu Sans Mono, Bitstream Vera Sans Mono, Monospace;\
-	 white-space:pre;\
- }\
- \
- table#results span.actual {\
-	 font-family:DejaVu Sans Mono, Bitstream Vera Sans Mono, Monospace;\
-	 white-space:pre;\
- }\
- ";
- 
- })(self);
- // vim: set expandtab shiftwidth=4 tabstop=4:
- 
\ No newline at end of file
diff --git a/test/wpt/runner/runner.mjs b/test/wpt/runner/runner.mjs
new file mode 100644
index 00000000000..000f69424f2
--- /dev/null
+++ b/test/wpt/runner/runner.mjs
@@ -0,0 +1,356 @@
+import { EventEmitter, once } from 'node:events'
+import { isAbsolute, join, resolve } from 'node:path'
+import { existsSync, readdirSync, readFileSync, statSync, writeFileSync } from 'node:fs'
+import { fileURLToPath } from 'node:url'
+import { Worker } from 'node:worker_threads'
+import { colors, handlePipes, normalizeName, parseMeta, resolveStatusPath } from './util.mjs'
+
+const basePath = fileURLToPath(join(import.meta.url, '../..'))
+const testPath = join(basePath, 'tests')
+const statusPath = join(basePath, 'status')
+
+// https://github.com/web-platform-tests/wpt/blob/b24eedd/resources/testharness.js#L3705
+function sanitizeUnpairedSurrogates (str) {
+  return str.replace(
+    /([\ud800-\udbff]+)(?![\udc00-\udfff])|(^|[^\ud800-\udbff])([\udc00-\udfff]+)/g,
+    function (_, low, prefix, high) {
+      let output = prefix || '' // Prefix may be undefined
+      const string = low || high // Only one of these alternates can match
+      for (let i = 0; i < string.length; i++) {
+        output += codeUnitStr(string[i])
+      }
+      return output
+    })
+}
+
+function codeUnitStr (char) {
+  return 'U+' + char.charCodeAt(0).toString(16)
+}
+
+export class WPTRunner extends EventEmitter {
+  /** @type {string} */
+  #folderName
+
+  /** @type {string} */
+  #folderPath
+
+  /** @type {string[]} */
+  #files = []
+
+  /** @type {string[]} */
+  #initScripts = []
+
+  /** @type {string} */
+  #url
+
+  /** @type {import('../../status/fetch.status.json')} */
+  #status
+
+  /** Tests that have expectedly failed mapped by file name */
+  #statusOutput = {}
+
+  #uncaughtExceptions = []
+
+  /** @type {boolean} */
+  #appendReport
+
+  /** @type {string} */
+  #reportPath
+
+  #stats = {
+    completed: 0,
+    failed: 0,
+    success: 0,
+    expectedFailures: 0,
+    skipped: 0
+  }
+
+  constructor (folder, url, { appendReport = false, reportPath } = {}) {
+    super()
+
+    this.#folderName = folder
+    this.#folderPath = join(testPath, folder)
+    this.#files.push(
+      ...WPTRunner.walk(
+        this.#folderPath,
+        (file) => file.endsWith('.any.js')
+      )
+    )
+
+    if (appendReport) {
+      if (!reportPath) {
+        throw new TypeError('reportPath must be provided when appendReport is true')
+      }
+      if (!existsSync(reportPath)) {
+        throw new TypeError('reportPath is invalid')
+      }
+    }
+
+    this.#appendReport = appendReport
+    this.#reportPath = reportPath
+
+    this.#status = JSON.parse(readFileSync(join(statusPath, `${folder}.status.json`)))
+    this.#url = url
+
+    if (this.#files.length === 0) {
+      queueMicrotask(() => {
+        this.emit('completion')
+      })
+    }
+
+    this.once('completion', () => {
+      for (const exception of this.#uncaughtExceptions) {
+        console.log(colors(`Uncaught exception: ${exception.stack}`, 'red'))
+        console.log('='.repeat(96))
+      }
+    })
+  }
+
+  static walk (dir, fn) {
+    const ini = new Set(readdirSync(dir))
+    const files = new Set()
+
+    while (ini.size !== 0) {
+      for (const d of ini) {
+        const path = resolve(dir, d)
+        ini.delete(d) // remove from set
+        const stats = statSync(path)
+
+        if (stats.isDirectory()) {
+          for (const f of readdirSync(path)) {
+            ini.add(resolve(path, f))
+          }
+        } else if (stats.isFile() && fn(d)) {
+          files.add(path)
+        }
+      }
+    }
+
+    return [...files].sort()
+  }
+
+  async run () {
+    const workerPath = fileURLToPath(join(import.meta.url, '../worker.mjs'))
+    /** @type {Set<Worker>} */
+    const activeWorkers = new Set()
+    let finishedFiles = 1
+    let total = this.#files.length
+
+    const files = this.#files.map((test) => {
+      const code = test.includes('.sub.')
+        ? handlePipes(readFileSync(test, 'utf-8'), this.#url)
+        : readFileSync(test, 'utf-8')
+      const meta = this.resolveMeta(code, test)
+
+      if (meta.variant.length) {
+        total += meta.variant.length - 1
+      }
+
+      return [test, code, meta]
+    })
+
+    for (const [test, code, meta] of files) {
+      console.log('='.repeat(96))
+      console.log(`Started ${test}`)
+
+      const status = resolveStatusPath(test, this.#status)
+
+      if (status.file.skip || status.topLevel.skip) {
+        this.#stats.skipped += 1
+
+        console.log(colors(`[${finishedFiles}/${total}] SKIPPED - ${test}`, 'yellow'))
+        console.log('='.repeat(96))
+
+        finishedFiles++
+        continue
+      }
+
+      const start = performance.now()
+
+      for (const variant of meta.variant.length ? meta.variant : ['']) {
+        const url = new URL(this.#url)
+        if (variant) {
+          url.search = variant
+        }
+        const worker = new Worker(workerPath, {
+          workerData: {
+            // Code to load before the test harness and tests.
+            initScripts: this.#initScripts,
+            // The test file.
+            test: code,
+            // Parsed META tag information
+            meta,
+            url: url.href,
+            path: test
+          }
+        })
+
+        let result, report
+        if (this.#appendReport) {
+          report = JSON.parse(readFileSync(this.#reportPath))
+
+          const fileUrl = new URL(`/${this.#folderName}${test.slice(this.#folderPath.length)}`, 'http://wpt')
+          fileUrl.pathname = fileUrl.pathname.replace(/\.js$/, '.html')
+          fileUrl.search = variant
+
+          result = {
+            test: fileUrl.href.slice(fileUrl.origin.length),
+            subtests: [],
+            status: 'OK'
+          }
+          report.results.push(result)
+        }
+
+        activeWorkers.add(worker)
+        // These values come directly from the web-platform-tests
+        const timeout = meta.timeout === 'long' ? 60_000 : 10_000
+
+        worker.on('message', (message) => {
+          if (message.type === 'result') {
+            this.handleIndividualTestCompletion(message, status, test, meta, result)
+          } else if (message.type === 'completion') {
+            this.handleTestCompletion(worker)
+          } else if (message.type === 'error') {
+            this.#uncaughtExceptions.push(message.error)
+            this.#stats.failed += 1
+            this.#stats.success -= 1
+          }
+        })
+
+        try {
+          await once(worker, 'exit', {
+            signal: AbortSignal.timeout(timeout)
+          })
+
+          console.log(colors(`[${finishedFiles}/${total}] PASSED - ${test}`, 'green'))
+          if (variant) console.log('Variant:', variant)
+          console.log(`Test took ${(performance.now() - start).toFixed(2)}ms`)
+          console.log('='.repeat(96))
+
+          if (result?.subtests.length > 0) {
+            writeFileSync(this.#reportPath, JSON.stringify(report))
+          }
+
+          finishedFiles++
+          activeWorkers.delete(worker)
+        } catch (e) {
+          console.log(`${test} timed out after ${timeout}ms`)
+          queueMicrotask(() => {
+            throw e
+          })
+          return
+        }
+      }
+    }
+
+    this.handleRunnerCompletion()
+  }
+
+  /**
+   * Called after a test has succeeded or failed.
+   */
+  handleIndividualTestCompletion (message, status, path, meta, wptResult) {
+    const { file, topLevel } = status
+
+    if (message.type === 'result') {
+      this.#stats.completed += 1
+
+      if (message.result.status === 1) {
+        this.#stats.failed += 1
+
+        wptResult?.subtests.push({
+          status: 'FAIL',
+          name: sanitizeUnpairedSurrogates(message.result.name),
+          message: sanitizeUnpairedSurrogates(message.result.message)
+        })
+
+        const name = normalizeName(message.result.name)
+
+        if (file.flaky?.includes(name)) {
+          this.#stats.expectedFailures += 1
+        } else if (file.allowUnexpectedFailures || topLevel.allowUnexpectedFailures || file.fail?.includes(name)) {
+          if (!file.allowUnexpectedFailures && !topLevel.allowUnexpectedFailures) {
+            if (Array.isArray(file.fail)) {
+              this.#statusOutput[path] ??= []
+              this.#statusOutput[path].push(name)
+            }
+          }
+
+          this.#stats.expectedFailures += 1
+        } else {
+          process.exitCode = 1
+          console.error(message.result)
+        }
+      } else {
+        wptResult?.subtests.push({
+          status: 'PASS',
+          name: sanitizeUnpairedSurrogates(message.result.name)
+        })
+        this.#stats.success += 1
+      }
+    }
+  }
+
+  /**
+   * Called after all the tests in a worker are completed.
+   * @param {Worker} worker
+   */
+  handleTestCompletion (worker) {
+    worker.terminate()
+  }
+
+  /**
+   * Called after every test has completed.
+   */
+  handleRunnerCompletion () {
+    console.log(this.#statusOutput) // tests that failed
+
+    this.emit('completion')
+    const { completed, failed, success, expectedFailures, skipped } = this.#stats
+    console.log(
+      `[${this.#folderName}]: ` +
+      `Completed: ${completed}, failed: ${failed}, success: ${success}, ` +
+      `expected failures: ${expectedFailures}, ` +
+      `unexpected failures: ${failed - expectedFailures}, ` +
+      `skipped: ${skipped}`
+    )
+  }
+
+  addInitScript (code) {
+    this.#initScripts.push(code)
+  }
+
+  /**
+   * Parses META tags and resolves any script file paths.
+   * @param {string} code
+   * @param {string} path The absolute path of the test
+   */
+  resolveMeta (code, path) {
+    const meta = parseMeta(code)
+    const scripts = meta.scripts.map((filePath) => {
+      let content = ''
+
+      if (filePath === '/resources/WebIDLParser.js') {
+        // See https://github.com/web-platform-tests/wpt/pull/731
+        return readFileSync(join(testPath, '/resources/webidl2/lib/webidl2.js'), 'utf-8')
+      } else if (isAbsolute(filePath)) {
+        content = readFileSync(join(testPath, filePath), 'utf-8')
+      } else {
+        content = readFileSync(resolve(path, '..', filePath), 'utf-8')
+      }
+
+      // If the file has any built-in pipes.
+      if (filePath.includes('.sub.')) {
+        content = handlePipes(content, this.#url)
+      }
+
+      return content
+    })
+
+    return {
+      ...meta,
+      resourcePaths: meta.scripts,
+      scripts
+    }
+  }
+}
diff --git a/test/wpt/runner/runner/runner.mjs b/test/wpt/runner/runner/runner.mjs
deleted file mode 100644
index da5cb96899c..00000000000
--- a/test/wpt/runner/runner/runner.mjs
+++ /dev/null
@@ -1,245 +0,0 @@
-import { deepStrictEqual } from 'node:assert'
-import { EventEmitter } from 'node:events'
-import { readdirSync, readFileSync, statSync } from 'node:fs'
-import { basename, isAbsolute, join, resolve } from 'node:path'
-import { fileURLToPath } from 'node:url'
-import { Worker } from 'node:worker_threads'
-import { parseMeta, handlePipes, normalizeName } from './util.mjs'
-
-const basePath = fileURLToPath(join(import.meta.url, '../../..'))
-const testPath = join(basePath, 'tests')
-const statusPath = join(basePath, 'status')
-
-export class WPTRunner extends EventEmitter {
-  /** @type {string} */
-  #folderName
-
-  /** @type {string} */
-  #folderPath
-
-  /** @type {string[]} */
-  #files = []
-
-  /** @type {string[]} */
-  #initScripts = []
-
-  /** @type {string} */
-  #url
-
-  /** @type {import('../../status/fetch.status.json')} */
-  #status
-
-  /** Tests that have expectedly failed mapped by file name */
-  #statusOutput = {}
-
-  #stats = {
-    completed: 0,
-    failed: 0,
-    success: 0,
-    expectedFailures: 0,
-    skipped: 0
-  }
-
-  constructor (folder, url) {
-    super()
-
-    this.#folderName = folder
-    this.#folderPath = join(testPath, folder)
-    this.#files.push(...WPTRunner.walk(
-      this.#folderPath,
-      (file) => file.endsWith('.js')
-    ))
-    this.#status = JSON.parse(readFileSync(join(statusPath, `${folder}.status.json`)))
-    this.#url = url
-
-    if (this.#files.length === 0) {
-      queueMicrotask(() => {
-        this.emit('completion')
-      })
-    }
-  }
-
-  static walk (dir, fn) {
-    const ini = new Set(readdirSync(dir))
-    const files = new Set()
-
-    while (ini.size !== 0) {
-      for (const d of ini) {
-        const path = resolve(dir, d)
-        ini.delete(d) // remove from set
-        const stats = statSync(path)
-
-        if (stats.isDirectory()) {
-          for (const f of readdirSync(path)) {
-            ini.add(resolve(path, f))
-          }
-        } else if (stats.isFile() && fn(d)) {
-          files.add(path)
-        }
-      }
-    }
-
-    return [...files]
-  }
-
-  run () {
-    const workerPath = fileURLToPath(join(import.meta.url, '../worker.mjs'))
-    /** @type {Set<Worker>} */
-    const activeWorkers = new Set()
-
-    for (const test of this.#files) {
-      const code = test.includes('.sub.')
-        ? handlePipes(readFileSync(test, 'utf-8'), this.#url)
-        : readFileSync(test, 'utf-8')
-      const meta = this.resolveMeta(code, test)
-
-      if (this.#status[basename(test)]?.skip) {
-        this.#stats.skipped += 1
-        continue
-      }
-
-      const worker = new Worker(workerPath, {
-        workerData: {
-          // Code to load before the test harness and tests.
-          initScripts: this.#initScripts,
-          // The test file.
-          test: code,
-          // Parsed META tag information
-          meta,
-          url: this.#url,
-          path: test
-        }
-      })
-
-      activeWorkers.add(worker)
-      const timeout = setTimeout(
-        () => {
-          console.warn('Test timed out:', test)
-        },
-        meta.timeout === 'long' ? 60_000 : 10_000
-      )
-
-      worker.on('message', (message) => {
-        if (message.type === 'result') {
-          this.handleIndividualTestCompletion(message, basename(test))
-        } else if (message.type === 'completion') {
-          this.handleTestCompletion(worker)
-        }
-      })
-
-      worker.once('exit', () => {
-        activeWorkers.delete(worker)
-        clearTimeout(timeout)
-
-        if (activeWorkers.size === 0) {
-          this.handleRunnerCompletion()
-        }
-      })
-    }
-  }
-
-  /**
-   * Called after a test has succeeded or failed.
-   */
-  handleIndividualTestCompletion (message, fileName) {
-    const { fail, allowUnexpectedFailures, flaky } = this.#status[fileName] ?? this.#status
-
-    if (message.type === 'result') {
-      this.#stats.completed += 1
-
-      if (message.result.status === 1) {
-        this.#stats.failed += 1
-
-        const name = normalizeName(message.result.name)
-
-        if (flaky?.includes(name)) {
-          this.#stats.expectedFailures += 1
-        } else if (allowUnexpectedFailures || fail?.includes(name)) {
-          if (!allowUnexpectedFailures) {
-            this.#statusOutput[fileName] ??= []
-            this.#statusOutput[fileName].push(name)
-          }
-          this.#stats.expectedFailures += 1
-        } else {
-          process.exitCode = 1
-          console.error(message.result)
-        }
-      } else {
-        this.#stats.success += 1
-      }
-    }
-  }
-
-  /**
-   * Called after all the tests in a worker are completed.
-   * @param {Worker} worker
-   */
-  handleTestCompletion (worker) {
-    worker.terminate()
-  }
-
-  /**
-   * Called after every test has completed.
-   */
-  handleRunnerCompletion () {
-    const expectedFailuresObject = Object.keys(this.#status).reduce((a, b) => {
-      if (Array.isArray(this.#status[b].fail)) {
-        a[b] = [...this.#status[b].fail]
-      }
-      return a
-    }, {})
-
-    deepStrictEqual(
-      this.#statusOutput,
-      expectedFailuresObject
-    )
-
-    this.emit('completion')
-    const { completed, failed, success, expectedFailures, skipped } = this.#stats
-    console.log(
-      `[${this.#folderName}]: ` +
-      `Completed: ${completed}, failed: ${failed}, success: ${success}, ` +
-      `expected failures: ${expectedFailures}, ` +
-      `unexpected failures: ${failed - expectedFailures}, ` +
-      `skipped: ${skipped}`
-    )
-  }
-
-  addInitScript (code) {
-    this.#initScripts.push(code)
-  }
-
-  /**
-   * Parses META tags and resolves any script file paths.
-   * @param {string} code
-   * @param {string} path The absolute path of the test
-   */
-  resolveMeta (code, path) {
-    const meta = parseMeta(code)
-    const scripts = meta.scripts.map((filePath) => {
-      let content = ''
-
-      if (filePath === '/resources/WebIDLParser.js') {
-        // See https://github.com/web-platform-tests/wpt/pull/731
-        return readFileSync(join(testPath, '/resources/webidl2/lib/webidl2.js'), 'utf-8')
-      } else if (isAbsolute(filePath)) {
-        content = readFileSync(join(testPath, filePath), 'utf-8')
-      } else {
-        content = readFileSync(resolve(path, '..', filePath), 'utf-8')
-      }
-
-      // If the file has any built-in pipes.
-      if (filePath.includes('.sub.')) {
-        content = handlePipes(content, this.#url)
-      }
-
-      return content
-    })
-
-    return {
-      ...meta,
-      resourcePaths: meta.scripts,
-      scripts
-    }
-  }
-}
diff --git a/test/wpt/runner/runner/util.mjs b/test/wpt/runner/util.mjs
similarity index 79%
rename from test/wpt/runner/runner/util.mjs
rename to test/wpt/runner/util.mjs
index c45fdc1df44..ec284df68b2 100644
--- a/test/wpt/runner/runner/util.mjs
+++ b/test/wpt/runner/util.mjs
@@ -1,5 +1,8 @@
+import assert from 'node:assert'
 import { exit } from 'node:process'
 import { inspect } from 'node:util'
+import tty from 'node:tty'
+import { sep } from 'node:path'
 
 /**
  * Parse the `Meta:` tags sometimes included in tests.
@@ -23,7 +26,9 @@ export function parseMeta (fileContents) {
     /** @type {string[]} */
     global: [],
     /** @type {string[]} */
-    scripts: []
+    scripts: [],
+    /** @type {string[]} */
+    variant: []
   }
 
   for (const line of lines) {
@@ -40,6 +45,8 @@ export function parseMeta (fileContents) {
 
     switch (groups.type) {
       case 'variant':
+        meta[groups.type].push(groups.match)
+        break
       case 'title':
       case 'timeout': {
         meta[groups.type] = groups.match
@@ -132,3 +139,34 @@ export function normalizeName (name) {
     }
   })
 }
+
+export function colors (str, color) {
+  assert(Object.hasOwn(inspect.colors, color), `Missing color ${color}`)
+
+  if (!tty.WriteStream.prototype.hasColors()) {
+    return str
+  }
+
+  const [start, end] = inspect.colors[color]
+
+  return `\u001b[${start}m${str}\u001b[${end}m`
+}
+
+/** @param {string} path */
+export function resolveStatusPath (path, status) {
+  const paths = path
+    .slice(process.cwd().length + sep.length)
+    .split(sep)
+    .slice(3) // [test, wpt, tests, fetch, b, c.js] -> [fetch, b, c.js]
+
+  // skip the first folder name
+  for (let i = 1; i < paths.length - 1; i++) {
+    status = status[paths[i]]
+
+    if (!status) {
+      break
+    }
+  }
+
+  return { topLevel: status ?? {}, file: status?.[paths.at(-1)] ?? {} }
+}
diff --git a/test/wpt/runner/runner/worker.mjs b/test/wpt/runner/worker.mjs
similarity index 68%
rename from test/wpt/runner/runner/worker.mjs
rename to test/wpt/runner/worker.mjs
index bf50dca4396..0b323b4c972 100644
--- a/test/wpt/runner/runner/worker.mjs
+++ b/test/wpt/runner/worker.mjs
@@ -1,22 +1,28 @@
+import buffer from 'node:buffer'
+import { readFileSync } from 'node:fs'
 import { join } from 'node:path'
-import { runInThisContext } from 'node:vm'
+import { setFlagsFromString } from 'node:v8'
+import { runInNewContext, runInThisContext } from 'node:vm'
 import { parentPort, workerData } from 'node:worker_threads'
-import { readFileSync } from 'node:fs'
 import {
-  setGlobalOrigin,
-  Response,
-  Request,
-  fetch,
-  FormData,
-  File,
-  Headers,
-  FileReader
-} from '../../../../index.js'
-import { WebSocket } from '../../../../lib/websocket/websocket.js'
-import { CloseEvent } from '../../../../lib/websocket/events.js'
+  fetch, File, FileReader, FormData, Headers, Request, Response, setGlobalOrigin
+} from '../../../index.js'
+import { CloseEvent } from '../../../lib/websocket/events.js'
+import { WebSocket } from '../../../lib/websocket/websocket.js'
 
 const { initScripts, meta, test, url, path } = workerData
 
+process.on('uncaughtException', (err) => {
+  parentPort.postMessage({
+    type: 'error',
+    error: {
+      message: err.message,
+      name: err.name,
+      stack: err.stack
+    }
+  })
+})
+
 const basePath = join(process.cwd(), 'test/wpt/tests')
 const urlPath = path.slice(basePath.length)
 
@@ -34,7 +40,7 @@ Object.defineProperties(globalThis, {
   },
   File: {
     ...globalPropertyDescriptors,
-    value: File
+    value: buffer.File ?? File
   },
   FormData: {
     ...globalPropertyDescriptors,
@@ -63,6 +69,11 @@ Object.defineProperties(globalThis, {
   CloseEvent: {
     ...globalPropertyDescriptors,
     value: CloseEvent
+  },
+  Blob: {
+    ...globalPropertyDescriptors,
+    // See https://github.com/nodejs/node/pull/45659
+    value: buffer.Blob
   }
 })
 
@@ -86,7 +97,11 @@ runInThisContext(`
   globalThis.Window = Object.getPrototypeOf(globalThis).constructor
 `)
 
-const harness = readFileSync(join(basePath, '../runner/resources/testharness.cjs'), 'utf-8')
+if (meta.title) {
+  runInThisContext(`globalThis.META_TITLE = "${meta.title}"`)
+}
+
+const harness = readFileSync(join(basePath, '/resources/testharness.js'), 'utf-8')
 runInThisContext(harness)
 
 // add_*_callback comes from testharness
@@ -125,5 +140,10 @@ for (const script of meta.scripts) {
   runInThisContext(script)
 }
 
+// A few tests require gc, which can't be passed to a Worker.
+// see https://github.com/nodejs/node/issues/16595#issuecomment-340288680
+setFlagsFromString('--expose-gc')
+globalThis.gc = runInNewContext('gc')
+
 // Finally, run the test.
 runInThisContext(test)
diff --git a/test/wpt/server/server.mjs b/test/wpt/server/server.mjs
index 13b8856a1f4..b06f86d13d5 100644
--- a/test/wpt/server/server.mjs
+++ b/test/wpt/server/server.mjs
@@ -335,6 +335,28 @@ const server = createServer(async (req, res) => {
       res.end(body)
       break
     }
+    case '/fetch/api/resources/authentication.py': {
+      const auth = Buffer.from(req.headers.authorization.slice('Basic '.length), 'base64')
+      const [user, password] = auth.toString().split(':')
+
+      if (user === 'user' && password === 'password') {
+        res.end('Authentication done')
+        return
+      }
+
+      const realm = fullUrl.searchParams.get('realm') ?? 'test'
+
+      res.statusCode = 401
+      res.setHeader('WWW-Authenticate', `Basic realm="${realm}"`)
+      res.end('Please login with credentials \'user\' and \'password\'')
+      return
+    }
+    case '/fetch/api/resources/redirect-empty-location.py': {
+      res.setHeader('location', '')
+      res.statusCode = 302
+      res.end('')
+      return
+    }
     default: {
       res.statusCode = 200
       res.end('body')
@@ -354,7 +376,7 @@ send({ server: `http://localhost:${server.address().port}` })
 
 process.on('message', (message) => {
   if (message === 'shutdown') {
-    server.close((err) => err ? send(err) : send({ message: 'shutdown' }))
+    server.close((err) => process.exit(err ? 1 : 0))
   }
 })
 
diff --git a/test/wpt/start-FileAPI.mjs b/test/wpt/start-FileAPI.mjs
index e601afc1120..5a92ab8b1f8 100644
--- a/test/wpt/start-FileAPI.mjs
+++ b/test/wpt/start-FileAPI.mjs
@@ -1,4 +1,4 @@
-import { WPTRunner } from './runner/runner/runner.mjs'
+import { WPTRunner } from './runner/runner.mjs'
 import { join } from 'path'
 import { fileURLToPath } from 'url'
 import { fork } from 'child_process'
@@ -10,15 +10,17 @@ const child = fork(serverPath, [], {
   stdio: ['pipe', 'pipe', 'pipe', 'ipc']
 })
 
+child.on('exit', (code) => process.exit(code))
+
 for await (const [message] of on(child, 'message')) {
   if (message.server) {
     const runner = new WPTRunner('FileAPI', message.server)
     runner.run()
 
     runner.once('completion', () => {
-      child.send('shutdown')
+      if (child.connected) {
+        child.send('shutdown')
+      }
     })
-  } else if (message.message === 'shutdown') {
-    process.exit()
   }
 }
diff --git a/test/wpt/start-fetch.mjs b/test/wpt/start-fetch.mjs
index 55d3f2e53ae..59c9f830916 100644
--- a/test/wpt/start-fetch.mjs
+++ b/test/wpt/start-fetch.mjs
@@ -1,24 +1,31 @@
-import { WPTRunner } from './runner/runner/runner.mjs'
+import { WPTRunner } from './runner/runner.mjs'
 import { join } from 'path'
 import { fileURLToPath } from 'url'
 import { fork } from 'child_process'
 import { on } from 'events'
 
+const { WPT_REPORT } = process.env
+
 const serverPath = fileURLToPath(join(import.meta.url, '../server/server.mjs'))
 
 const child = fork(serverPath, [], {
   stdio: ['pipe', 'pipe', 'pipe', 'ipc']
 })
 
+child.on('exit', (code) => process.exit(code))
+
 for await (const [message] of on(child, 'message')) {
   if (message.server) {
-    const runner = new WPTRunner('fetch', message.server)
+    const runner = new WPTRunner('fetch', message.server, {
+      appendReport: !!WPT_REPORT,
+      reportPath: WPT_REPORT
+    })
     runner.run()
 
     runner.once('completion', () => {
-      child.send('shutdown')
+      if (child.connected) {
+        child.send('shutdown')
+      }
     })
-  } else if (message.message === 'shutdown') {
-    process.exit()
   }
 }
diff --git a/test/wpt/start-mimesniff.mjs b/test/wpt/start-mimesniff.mjs
index 90e6bdd6c04..fbdb9bf0ece 100644
--- a/test/wpt/start-mimesniff.mjs
+++ b/test/wpt/start-mimesniff.mjs
@@ -1,24 +1,31 @@
-import { WPTRunner } from './runner/runner/runner.mjs'
+import { WPTRunner } from './runner/runner.mjs'
 import { join } from 'path'
 import { fileURLToPath } from 'url'
 import { fork } from 'child_process'
 import { on } from 'events'
 
+const { WPT_REPORT } = process.env
+
 const serverPath = fileURLToPath(join(import.meta.url, '../server/server.mjs'))
 
 const child = fork(serverPath, [], {
   stdio: ['pipe', 'pipe', 'pipe', 'ipc']
 })
 
+child.on('exit', (code) => process.exit(code))
+
 for await (const [message] of on(child, 'message')) {
   if (message.server) {
-    const runner = new WPTRunner('mimesniff', message.server)
+    const runner = new WPTRunner('mimesniff', message.server, {
+      appendReport: !!WPT_REPORT,
+      reportPath: WPT_REPORT
+    })
     runner.run()
 
     runner.once('completion', () => {
-      child.send('shutdown')
+      if (child.connected) {
+        child.send('shutdown')
+      }
     })
-  } else if (message.message === 'shutdown') {
-    process.exit()
   }
 }
diff --git a/test/wpt/start-websockets.mjs b/test/wpt/start-websockets.mjs
index a7078c6d8d3..b9d8162aa33 100644
--- a/test/wpt/start-websockets.mjs
+++ b/test/wpt/start-websockets.mjs
@@ -1,15 +1,22 @@
-import { WPTRunner } from './runner/runner/runner.mjs'
+import { WPTRunner } from './runner/runner.mjs'
 import { join } from 'path'
 import { fileURLToPath } from 'url'
 import { fork } from 'child_process'
 import { on } from 'events'
 
+if (process.env.CI) {
+  // TODO(@KhafraDev): figure out *why* these tests are flaky in the CI.
+  // process.exit(0)
+}
+
 const serverPath = fileURLToPath(join(import.meta.url, '../server/websocket.mjs'))
 
 const child = fork(serverPath, [], {
   stdio: ['pipe', 'pipe', 'pipe', 'ipc']
 })
 
+child.on('exit', (code) => process.exit(code))
+
 for await (const [message] of on(child, 'message')) {
   if (message.server) {
     const runner = new WPTRunner('websockets', message.server)
@@ -20,7 +27,5 @@ for await (const [message] of on(child, 'message')) {
         child.send('shutdown')
       }
     })
-  } else if (message.message === 'shutdown') {
-    process.exit()
   }
 }
diff --git a/test/wpt/start-xhr.mjs b/test/wpt/start-xhr.mjs
index 09d7578823b..08f82ebc579 100644
--- a/test/wpt/start-xhr.mjs
+++ b/test/wpt/start-xhr.mjs
@@ -1,7 +1,12 @@
-import { WPTRunner } from './runner/runner/runner.mjs'
+import { WPTRunner } from './runner/runner.mjs'
 import { once } from 'events'
 
-const runner = new WPTRunner('xhr', 'http://localhost:3333')
+const { WPT_REPORT } = process.env
+
+const runner = new WPTRunner('xhr/formdata', 'http://localhost:3333', {
+  appendReport: !!WPT_REPORT,
+  reportPath: WPT_REPORT
+})
 runner.run()
 
 await once(runner, 'completion')
diff --git a/test/wpt/status/FileAPI.status.json b/test/wpt/status/FileAPI.status.json
index d0d9825c6ef..c64d255a0d3 100644
--- a/test/wpt/status/FileAPI.status.json
+++ b/test/wpt/status/FileAPI.status.json
@@ -1,9 +1,54 @@
 {
-	"File-constructor.any.js": {
-		"fail": [
-			"Using type in File constructor: nonparsable"
-		]
-	},
+  "file": {
+    "File-constructor.any.js": {
+      "flaky": [
+        "Using type in File constructor: nonparsable"
+      ]
+    }
+  },
+  "blob": {
+    "Blob-constructor.any.js": {
+      "skip": true
+    },
+    "Blob-stream.any.js": {
+      "fail": [
+        "Reading Blob.stream() with BYOB reader"
+      ]
+    }
+  },
+  "url": {
+    "url-with-xhr.any.js": {
+      "skip": true
+    },
+    "url-with-fetch.any.js": {
+      "note": "needs investigation",
+      "fail": [
+        "Only exact matches should revoke URLs, using fetch",
+        "Revoke blob URL after creating Request, will fetch",
+        "Revoke blob URL after creating Request, then clone Request, will fetch"
+      ]
+    },
+    "url-format.any.js": {
+      "fail": [
+        "Origin of Blob URL matches our origin",
+        "Blob URL parses correctly",
+        "Origin of Blob URL matches our origin for Files"
+      ]
+    }
+  },
+  "reading-data-section": {
+    "filereader_result.any.js": {
+      "note": "has to do with html microtask queue being different than queueMicrotask",
+      "skip": true
+    },
+    "filereader_events.any.js": {
+      "note": "has to do with html microtask queue being different than queueMicrotask",
+      "fail": [
+        "events are dispatched in the correct order for an empty blob",
+        "events are dispatched in the correct order for a non-empty blob"
+      ]
+    }
+  },
 	"idlharness.any.js": {
 		"note": "These flaky tests only fail in < node v19; add in a way to mark them as such eventually",
 		"flaky": [
@@ -26,11 +71,5 @@
 			"FileList interface: operation item(unsigned long)",
 			"FileList interface: attribute length"
 		]
-	},
-	"filereader_events.any.js": {
-		"fail": [
-			"events are dispatched in the correct order for an empty blob",
-			"events are dispatched in the correct order for a non-empty blob"
-		]
 	}
 }
diff --git a/test/wpt/status/fetch.status.json b/test/wpt/status/fetch.status.json
index 1a6a5084746..c98604603da 100644
--- a/test/wpt/status/fetch.status.json
+++ b/test/wpt/status/fetch.status.json
@@ -1,210 +1,429 @@
 {
-	"general.any.js": {
-		"flaky": [
-			"Already aborted signal rejects immediately",
-			"Underlying connection is closed when aborting after receiving response - no-cors",
-			"Stream errors once aborted. Underlying connection closed."
-		]
-	},
-	"request-disturbed.any.js": {
-		"fail": [
-			"Input request used for creating new request became disturbed even if body is not used"
-		]
-	},
-	"response-error-from-stream.any.js": {
-		"fail": [
-			"ReadableStream start() Error propagates to Response.formData() Promise",
-			"ReadableStream pull() Error propagates to Response.formData() Promise"
-		]
-	},
-	"response-consume-empty.any.js": {
-		"fail": [
-			"Consume empty FormData response body as text"
-		]
-	},
+  "api": {
+    "abort": {
+      "general.any.js": {
+        "fail": [
+          "Already aborted signal rejects immediately",
+          "Underlying connection is closed when aborting after receiving response - no-cors",
+          "Stream errors once aborted. Underlying connection closed.",
+          "Readable stream synchronously cancels with AbortError if aborted before reading"
+        ]
+      },
+      "cache.https.any.js": {
+        "note": "undici doesn't implement http caching",
+        "skip": true
+      }
+    },
+    "basic": {
+      "conditional-get.any.js": {
+        "fail": [
+          "Testing conditional GET with ETags"
+        ]
+      },
+      "header-value-combining.any.js": {
+        "fail": [
+          "response.headers.get('content-length') expects 0, 0",
+          "response.headers.get('foo-test') expects 1, 2, 3",
+          "response.headers.get('heya') expects , \\x0B\f, 1, , , 2"
+        ],
+        "flaky": [
+          "response.headers.get('content-length') expects 0",
+          "response.headers.get('double-trouble') expects , ",
+          "response.headers.get('www-authenticate') expects 1, 2, 3, 4"
+        ]
+      },
+      "integrity.sub.any.js": {
+        "fail": [
+          "Empty string integrity for opaque response"
+        ]
+      },
+      "mode-no-cors.sub.any.js": {
+        "note": "undici doesn't implement CORs",
+        "skip": true
+      },
+      "mode-same-origin.any.js": {
+        "note": "undici doesn't respect RequestInit.mode",
+        "skip": true
+      },
+      "referrer.any.js": {
+        "fail": [
+          "origin-when-cross-origin policy on a cross-origin URL",
+          "origin-when-cross-origin policy on a cross-origin URL after same-origin redirection",
+          "origin-when-cross-origin policy on a same-origin URL after cross-origin redirection"
+        ]
+      },
+      "request-forbidden-headers.any.js": {
+        "note": "undici doesn't filter headers",
+        "skip": true
+      },
+      "request-headers.any.js": {
+        "fail": [
+          "Fetch with Chicken",
+          "Fetch with Chicken with body",
+          "Fetch with TacO and mode \"same-origin\" needs an Origin header",
+          "Fetch with TacO and mode \"cors\" needs an Origin header"
+        ]
+      },
+      "request-referrer.any.js": {
+        "note": "TODO(@KhafraDev): url referrer test could probably be fixed",
+        "fail": [
+          "about:client referrer",
+          "url referrer"
+        ]
+      },
+      "request-upload.any.js": {
+        "fail": [
+          "Fetch with POST with text body on 421 response should be retried once on new connection."	
+        ]
+      },
+      "request-upload.h2.any.js": {
+        "note": "undici doesn't support http/2",
+        "skip": true
+      },
+      "status.h2.any.js": {
+        "note": "undici doesn't support http/2",
+        "skip": true
+      },
+      "stream-safe-creation.any.js": {
+        "note": "tests are very finnicky",
+        "fail": [
+          "throwing Object.prototype.type accessor should not affect stream creation by 'fetch'",
+          "Object.prototype.type accessor returning invalid value should not affect stream creation by 'fetch'",
+          "throwing Object.prototype.highWaterMark accessor should not affect stream creation by 'fetch'",
+          "Object.prototype.highWaterMark accessor returning invalid value should not affect stream creation by 'fetch'"
+        ]
+      }
+    },
+    "cors": {
+      "note": "undici doesn't implement CORs",
+      "skip": true
+    },
+    "credentials": {
+      "authentication-redirection.any.js": {
+        "note": "connects to https server",
+        "fail": [
+          "getAuthorizationHeaderValue - cross origin redirection",
+          "getAuthorizationHeaderValue - same origin redirection"
+        ]
+      },
+      "cookies.any.js": {
+        "fail": [
+          "Include mode: 1 cookie",
+          "Include mode: 2 cookies",
+          "Same-origin mode: 1 cookie",
+          "Same-origin mode: 2 cookies"
+        ]
+      }
+    },
+    "headers": {
+      "header-setcookie.any.js": {
+        "note": "undici doesn't filter headers",
+        "fail": [
+          "Set-Cookie is a forbidden response header"
+        ]
+      },
+      "header-values-normalize.any.js": {
+        "note": "TODO(@KhafraDev): https://github.com/nodejs/undici/issues/1680",
+        "fail": [
+          "XMLHttpRequest with value %00",
+          "XMLHttpRequest with value %01",
+          "XMLHttpRequest with value %02",
+          "XMLHttpRequest with value %03",
+          "XMLHttpRequest with value %04",
+          "XMLHttpRequest with value %05",
+          "XMLHttpRequest with value %06",
+          "XMLHttpRequest with value %07",
+          "XMLHttpRequest with value %08",
+          "XMLHttpRequest with value %09",
+          "XMLHttpRequest with value %0A",
+          "XMLHttpRequest with value %0D",
+          "XMLHttpRequest with value %0E",
+          "XMLHttpRequest with value %0F",
+          "XMLHttpRequest with value %10",
+          "XMLHttpRequest with value %11",
+          "XMLHttpRequest with value %12",
+          "XMLHttpRequest with value %13",
+          "XMLHttpRequest with value %14",
+          "XMLHttpRequest with value %15",
+          "XMLHttpRequest with value %16",
+          "XMLHttpRequest with value %17",
+          "XMLHttpRequest with value %18",
+          "XMLHttpRequest with value %19",
+          "XMLHttpRequest with value %1A",
+          "XMLHttpRequest with value %1B",
+          "XMLHttpRequest with value %1C",
+          "XMLHttpRequest with value %1D",
+          "XMLHttpRequest with value %1E",
+          "XMLHttpRequest with value %1F",
+          "XMLHttpRequest with value %20",
+          "fetch() with value %01",
+          "fetch() with value %02",
+          "fetch() with value %03",
+          "fetch() with value %04",
+          "fetch() with value %05",
+          "fetch() with value %06",
+          "fetch() with value %07",
+          "fetch() with value %08",
+          "fetch() with value %0E",
+          "fetch() with value %0F",
+          "fetch() with value %10",
+          "fetch() with value %11",
+          "fetch() with value %12",
+          "fetch() with value %13",
+          "fetch() with value %14",
+          "fetch() with value %15",
+          "fetch() with value %16",
+          "fetch() with value %17",
+          "fetch() with value %18",
+          "fetch() with value %19",
+          "fetch() with value %1A",
+          "fetch() with value %1B",
+          "fetch() with value %1C",
+          "fetch() with value %1D",
+          "fetch() with value %1E",
+          "fetch() with value %1F"
+        ]
+      },
+      "header-values.any.js": {
+        "fail": [
+          "XMLHttpRequest with value x%00x needs to throw",
+          "XMLHttpRequest with value x%0Ax needs to throw",
+          "XMLHttpRequest with value x%0Dx needs to throw",
+          "XMLHttpRequest with all valid values",
+          "fetch() with all valid values"
+        ]
+      },
+      "headers-no-cors.any.js": {
+        "note": "undici doesn't implement CORs",
+        "skip": true
+      }
+    },
+    "redirect": {
+      "redirect-empty-location.any.js": {
+        "note": "undici handles redirect: manual differently than browsers",
+        "fail": [
+          "redirect response with empty Location, manual mode"
+        ]
+      },
+      "redirect-location-escape.tentative.any.js": {
+        "note": "TODO(@KhafraDev): crashes runner",
+        "skip": true
+      },
+      "redirect-location.any.js": {
+        "note": "undici handles redirect: manual differently than browsers",
+        "fail": [
+          "Redirect 301 in \"manual\" mode without location",
+          "Redirect 301 in \"manual\" mode with invalid location",
+          "Redirect 301 in \"manual\" mode with data location",
+          "Redirect 302 in \"manual\" mode without location",
+          "Redirect 302 in \"manual\" mode with invalid location",
+          "Redirect 302 in \"manual\" mode with data location",
+          "Redirect 303 in \"manual\" mode without location",
+          "Redirect 303 in \"manual\" mode with invalid location",
+          "Redirect 303 in \"manual\" mode with data location",
+          "Redirect 307 in \"manual\" mode without location",
+          "Redirect 307 in \"manual\" mode with invalid location",
+          "Redirect 307 in \"manual\" mode with data location",
+          "Redirect 308 in \"manual\" mode without location",
+          "Redirect 308 in \"manual\" mode with invalid location",
+          "Redirect 308 in \"manual\" mode with data location"
+        ]
+      },
+      "redirect-method.any.js": {
+        "fail": [
+          "Redirect 303 with TESTING"
+        ]
+      },
+      "redirect-mode.any.js": {
+        "note": "mode isn't respected",
+        "skip": true
+      },
+      "redirect-origin.any.js": {
+        "note": "TODO(@KhafraDev): investigate",
+        "skip": true
+      },
+      "redirect-referrer-override.any.js": {
+        "note": "TODO(@KhafraDev): investigate",
+        "skip": true
+      },
+      "redirect-referrer.any.js": {
+        "note": "TODO(@KhafraDev): investigate",
+        "skip": true
+      },
+      "redirect-upload.h2.any.js": {
+        "note": "undici doesn't support http/2",
+        "skip": true
+      }
+    },
+    "request": {
+      "request-cache-default-conditional.any.js": {
+        "note": "undici doesn't implement an http cache",
+        "skip": true
+      },
+      "request-cache-default.any.js": {
+        "note": "undici doesn't implement an http cache",
+        "skip": true
+      },
+      "request-cache-force-cache.any.js": {
+        "note": "undici doesn't implement an http cache",
+        "skip": true
+      },
+      "request-cache-no-cache.any.js": {
+        "note": "undici doesn't implement an http cache",
+        "skip": true
+      },
+      "request-cache-no-store.any.js": {
+        "note": "undici doesn't implement an http cache",
+        "skip": true
+      },
+      "request-cache-only-if-cached.any.js": {
+        "note": "undici doesn't implement an http cache",
+        "skip": true
+      },
+      "request-cache-reload.any.js": {
+        "note": "undici doesn't implement an http cache",
+        "skip": true
+      },
+      "request-consume-empty.any.js": {
+        "note": "the semantics about this test are being discussed - https://github.com/web-platform-tests/wpt/pull/3950",
+        "fail": [
+          "Consume empty FormData request body as text"
+        ]
+      },
+      "request-disturbed.any.js": {
+        "note": "this test fails in all other platforms - https://wpt.fyi/results/fetch/api/request/request-disturbed.any.html?label=master&label=experimental&product=chrome&product=firefox&product=safari&product=deno&aligned&view=subtest",
+        "fail": [
+          "Input request used for creating new request became disturbed even if body is not used"
+        ]
+      },
+      "request-headers.any.js": {
+        "note": "undici doesn't filter headers",
+        "fail": [
+          "Adding invalid request header \"Accept-Charset: KO\"",
+          "Adding invalid request header \"accept-charset: KO\"",
+          "Adding invalid request header \"ACCEPT-ENCODING: KO\"",
+          "Adding invalid request header \"Accept-Encoding: KO\"",
+          "Adding invalid request header \"Access-Control-Request-Headers: KO\"",
+          "Adding invalid request header \"Access-Control-Request-Method: KO\"",
+          "Adding invalid request header \"Access-Control-Request-Private-Network: KO\"",
+          "Adding invalid request header \"Connection: KO\"",
+          "Adding invalid request header \"Content-Length: KO\"",
+          "Adding invalid request header \"Cookie: KO\"",
+          "Adding invalid request header \"Cookie2: KO\"",
+          "Adding invalid request header \"Date: KO\"",
+          "Adding invalid request header \"DNT: KO\"",
+          "Adding invalid request header \"Expect: KO\"",
+          "Adding invalid request header \"Host: KO\"",
+          "Adding invalid request header \"Keep-Alive: KO\"",
+          "Adding invalid request header \"Origin: KO\"",
+          "Adding invalid request header \"Referer: KO\"",
+          "Adding invalid request header \"Set-Cookie: KO\"",
+          "Adding invalid request header \"TE: KO\"",
+          "Adding invalid request header \"Trailer: KO\"",
+          "Adding invalid request header \"Transfer-Encoding: KO\"",
+          "Adding invalid request header \"Upgrade: KO\"",
+          "Adding invalid request header \"Via: KO\"",
+          "Adding invalid request header \"Proxy-: KO\"",
+          "Adding invalid request header \"proxy-a: KO\"",
+          "Adding invalid request header \"Sec-: KO\"",
+          "Adding invalid request header \"sec-b: KO\"",
+          "Adding invalid no-cors request header \"Content-Type: KO\"",
+          "Adding invalid no-cors request header \"Potato: KO\"",
+          "Adding invalid no-cors request header \"proxy: KO\"",
+          "Adding invalid no-cors request header \"proxya: KO\"",
+          "Adding invalid no-cors request header \"sec: KO\"",
+          "Adding invalid no-cors request header \"secb: KO\"",
+          "Adding invalid no-cors request header \"Empty-Value: \"",
+          "Check that request constructor is filtering headers provided as init parameter",
+          "Check that no-cors request constructor is filtering headers provided as init parameter",
+          "Check that no-cors request constructor is filtering headers provided as part of request parameter"
+        ]
+      },
+      "request-init-priority.any.js": {
+        "note": "undici doesn't implement priority hints, yet(?)",
+        "skip": true
+      }
+    },
+    "response": {
+      "response-clone.any.js": {
+        "fail": [
+          "Check response clone use structureClone for teed ReadableStreams (ArrayBufferchunk)",
+          "Check response clone use structureClone for teed ReadableStreams (DataViewchunk)"
+        ]
+      },
+      "response-consume-empty.any.js": {
+        "fail": [
+          "Consume empty FormData response body as text"
+        ]
+      },
+      "response-consume-stream.any.js": {
+        "fail": [
+          "Read blob response's body as readableStream with mode=byob",
+          "Read text response's body as readableStream with mode=byob",
+          "Read URLSearchParams response's body as readableStream with mode=byob",
+          "Read array buffer response's body as readableStream with mode=byob",
+          "Read form data response's body as readableStream with mode=byob"
+        ]
+      },
+      "response-error-from-stream.any.js": {
+        "fail": [
+          "ReadableStream start() Error propagates to Response.formData() Promise",
+          "ReadableStream pull() Error propagates to Response.formData() Promise"
+        ]
+      },
+      "response-stream-with-broken-then.any.js": {
+        "note": "this is a bug in webstreams, see https://github.com/nodejs/node/issues/46786",
+        "skip": true
+      }
+    }
+  },
+  "content-length": {
+    "api-and-duplicate-headers.any.js": {
+      "fail": [
+        "XMLHttpRequest and duplicate Content-Length/Content-Type headers",
+        "fetch() and duplicate Content-Length/Content-Type headers"
+      ]
+    }
+  },
+  "cross-origin-resource-policy": {
+    "note": "undici doesn't implement CORs",
+    "skip": true
+  },
+  "http-cache": {
+    "note": "undici doesn't implement http caching",
+    "skip": true
+  },
+  "metadata": {
+    "note": "undici doesn't respect RequestInit.mode",
+    "skip": true
+  },
+  "orb": {
+    "tentative": {
+      "note": "undici doesn't implement orb",
+      "skip": true
+    }
+  },
+  "range": {
+    "note": "undici doesn't respect range header",
+    "skip": true
+  },
+  "security": {
+    "1xx-response.any.js": {
+      "fail": [
+        "Status(100) should be ignored.",
+        "Status(101) should be accepted, with removing body.",
+        "Status(103) should be ignored.",
+        "Status(199) should be ignored."
+      ]
+    }
+  },
+  "stale-while-revalidate": {
+    "note": "undici doesn't implement http caching",
+    "skip": true
+  },
 	"idlharness.any.js": {
 		"flaky": [
 			"Window interface: operation fetch(RequestInfo, optional RequestInit)"
 		]
-	},
-	"response-clone.any.js": {
-		"fail": [
-			"Check response clone use structureClone for teed ReadableStreams (ArrayBufferchunk)",
-			"Check response clone use structureClone for teed ReadableStreams (DataViewchunk)"
-		]
-	},
-	"request-upload.any.js": {
-		"fail": [
-			"Fetch with POST with text body on 421 response should be retried once on new connection."	
-		]
-	},
-	"stream-safe-creation.any.js": {
-		"fail": [
-			"throwing Object.prototype.type accessor should not affect stream creation by 'fetch'",
-			"Object.prototype.type accessor returning invalid value should not affect stream creation by 'fetch'",
-			"throwing Object.prototype.highWaterMark accessor should not affect stream creation by 'fetch'",
-			"Object.prototype.highWaterMark accessor returning invalid value should not affect stream creation by 'fetch'"
-		]
-	},
-	"header-value-combining.any.js": {
-		"fail": [
-			"response.headers.get('content-length') expects 0, 0",
-			"response.headers.get('foo-test') expects 1, 2, 3",
-			"response.headers.get('heya') expects , \\x0B\f, 1, , , 2"
-		],
-		"flaky": [
-			"response.headers.get('content-length') expects 0",
-      "response.headers.get('double-trouble') expects , ",
-			"response.headers.get('www-authenticate') expects 1, 2, 3, 4"
-		]
-	},
-	"integrity.sub.any.js": {
-		"fail": [
-			"Empty string integrity for opaque response"
-		]
-	},
-	"request-headers.any.js": {
-		"fail": [
-			"Adding invalid request header \"Accept-Charset: KO\"",
-			"Adding invalid request header \"accept-charset: KO\"",
-			"Adding invalid request header \"ACCEPT-ENCODING: KO\"",
-			"Adding invalid request header \"Accept-Encoding: KO\"",
-			"Adding invalid request header \"Access-Control-Request-Headers: KO\"",
-			"Adding invalid request header \"Access-Control-Request-Method: KO\"",
-			"Adding invalid request header \"Connection: KO\"",
-			"Adding invalid request header \"Content-Length: KO\"",
-			"Adding invalid request header \"Cookie: KO\"",
-			"Adding invalid request header \"Cookie2: KO\"",
-			"Adding invalid request header \"Date: KO\"",
-			"Adding invalid request header \"DNT: KO\"",
-			"Adding invalid request header \"Expect: KO\"",
-			"Adding invalid request header \"Host: KO\"",
-			"Adding invalid request header \"Keep-Alive: KO\"",
-			"Adding invalid request header \"Origin: KO\"",
-			"Adding invalid request header \"Referer: KO\"",
-			"Adding invalid request header \"Set-Cookie: KO\"",
-			"Adding invalid request header \"TE: KO\"",
-			"Adding invalid request header \"Trailer: KO\"",
-			"Adding invalid request header \"Transfer-Encoding: KO\"",
-			"Adding invalid request header \"Upgrade: KO\"",
-			"Adding invalid request header \"Via: KO\"",
-			"Adding invalid request header \"Proxy-: KO\"",
-			"Adding invalid request header \"proxy-a: KO\"",
-			"Adding invalid request header \"Sec-: KO\"",
-			"Adding invalid request header \"sec-b: KO\"",
-			"Adding invalid no-cors request header \"Content-Type: KO\"",
-			"Adding invalid no-cors request header \"Potato: KO\"",
-			"Adding invalid no-cors request header \"proxy: KO\"",
-			"Adding invalid no-cors request header \"proxya: KO\"",
-			"Adding invalid no-cors request header \"sec: KO\"",
-			"Adding invalid no-cors request header \"secb: KO\"",
-			"Check that request constructor is filtering headers provided as init parameter",
-			"Check that no-cors request constructor is filtering headers provided as init parameter",
-			"Check that no-cors request constructor is filtering headers provided as part of request parameter"
-		]
-	},
-	"request-consume.any.js": {
-		"fail": [
-			"Consume blob response's body as blob"
-		]
-	},
-	"request-consume-empty.any.js": {
-		"fail": [
-			"Consume empty FormData request body as text"
-		]
-	},
-	"redirect-method.any.js": {
-		"fail": [
-			"Redirect 303 with TESTING"
-		]
-	},
-	"redirect-location.any.js": {
-		"fail": [
-			"Redirect 301 in \"manual\" mode without location",
-			"Redirect 301 in \"manual\" mode with invalid location",
-			"Redirect 301 in \"manual\" mode with data location",
-			"Redirect 302 in \"manual\" mode without location",
-			"Redirect 302 in \"manual\" mode with invalid location",
-			"Redirect 302 in \"manual\" mode with data location",
-			"Redirect 303 in \"manual\" mode without location",
-			"Redirect 303 in \"manual\" mode with invalid location",
-			"Redirect 303 in \"manual\" mode with data location",
-			"Redirect 307 in \"manual\" mode without location",
-			"Redirect 307 in \"manual\" mode with invalid location",
-			"Redirect 307 in \"manual\" mode with data location",
-			"Redirect 308 in \"manual\" mode without location",
-			"Redirect 308 in \"manual\" mode with invalid location",
-			"Redirect 308 in \"manual\" mode with data location"
-		]
-	},
-	"header-values.any.js": {
-		"fail": [
-			"XMLHttpRequest with value x%00x needs to throw",
-			"XMLHttpRequest with value x%0Ax needs to throw",
-			"XMLHttpRequest with value x%0Dx needs to throw",
-			"XMLHttpRequest with all valid values",
-			"fetch() with all valid values"
-		]
-	},
-	"header-values-normalize.any.js": {
-		"fail": [
-			"XMLHttpRequest with value %00",
-			"XMLHttpRequest with value %01",
-			"XMLHttpRequest with value %02",
-			"XMLHttpRequest with value %03",
-			"XMLHttpRequest with value %04",
-			"XMLHttpRequest with value %05",
-			"XMLHttpRequest with value %06",
-			"XMLHttpRequest with value %07",
-			"XMLHttpRequest with value %08",
-			"XMLHttpRequest with value %09",
-			"XMLHttpRequest with value %0A",
-			"XMLHttpRequest with value %0D",
-			"XMLHttpRequest with value %0E",
-			"XMLHttpRequest with value %0F",
-			"XMLHttpRequest with value %10",
-			"XMLHttpRequest with value %11",
-			"XMLHttpRequest with value %12",
-			"XMLHttpRequest with value %13",
-			"XMLHttpRequest with value %14",
-			"XMLHttpRequest with value %15",
-			"XMLHttpRequest with value %16",
-			"XMLHttpRequest with value %17",
-			"XMLHttpRequest with value %18",
-			"XMLHttpRequest with value %19",
-			"XMLHttpRequest with value %1A",
-			"XMLHttpRequest with value %1B",
-			"XMLHttpRequest with value %1C",
-			"XMLHttpRequest with value %1D",
-			"XMLHttpRequest with value %1E",
-			"XMLHttpRequest with value %1F",
-			"XMLHttpRequest with value %20",
-			"fetch() with value %01",
-			"fetch() with value %02",
-			"fetch() with value %03",
-			"fetch() with value %04",
-			"fetch() with value %05",
-			"fetch() with value %06",
-			"fetch() with value %07",
-			"fetch() with value %08",
-			"fetch() with value %0E",
-			"fetch() with value %0F",
-			"fetch() with value %10",
-			"fetch() with value %11",
-			"fetch() with value %12",
-			"fetch() with value %13",
-			"fetch() with value %14",
-			"fetch() with value %15",
-			"fetch() with value %16",
-			"fetch() with value %17",
-			"fetch() with value %18",
-			"fetch() with value %19",
-			"fetch() with value %1A",
-			"fetch() with value %1B",
-			"fetch() with value %1C",
-			"fetch() with value %1D",
-			"fetch() with value %1E",
-			"fetch() with value %1F"
-		]
 	}
 }
diff --git a/test/wpt/status/mimesniff.status.json b/test/wpt/status/mimesniff.status.json
index d1b1c33e8af..ab9a3d32640 100644
--- a/test/wpt/status/mimesniff.status.json
+++ b/test/wpt/status/mimesniff.status.json
@@ -1,5 +1,7 @@
 {
-	"parsing.any.js": {
-		"allowUnexpectedFailures": true
-	}
-}
\ No newline at end of file
+  "mime-types": {
+    "parsing.any.js": {
+      "allowUnexpectedFailures": true
+    }
+  }
+}
diff --git a/test/wpt/status/websockets.status.json b/test/wpt/status/websockets.status.json
index 4f0efbdded9..4a5bdf502c3 100644
--- a/test/wpt/status/websockets.status.json
+++ b/test/wpt/status/websockets.status.json
@@ -1,5 +1,57 @@
 {
-  "allowUnexpectedFailures": true,
+  "stream": {
+    "tentative": {
+      "skip": true
+    }
+  },
+  "Create-blocked-port.any.js": {
+    "note": "TODO(@KhafraDev): investigate failure",
+    "fail": [
+      "Basic check"
+    ]
+  },
+  "Send-binary-arraybufferview-float32.any.js": {
+    "note": "TODO(@KhafraDev): investigate failure",
+    "fail": [
+      "Send binary data on a WebSocket - ArrayBufferView - Float32Array - Connection should be closed"
+    ]
+  },
+  "Send-binary-arraybufferview-float64.any.js": {
+    "note": "TODO(@KhafraDev): investigate failure",
+    "fail": [
+      "Send binary data on a WebSocket - ArrayBufferView - Float64Array - Connection should be closed"
+    ]
+  },
+  "Send-binary-arraybufferview-int16-offset.any.js": {
+    "note": "TODO(@KhafraDev): investigate failure",
+    "fail": [
+      "Send binary data on a WebSocket - ArrayBufferView - Int16Array with offset - Connection should be closed"
+    ]
+  },
+  "Send-binary-arraybufferview-int32.any.js": {
+    "note": "TODO(@KhafraDev): investigate failure",
+    "fail": [
+      "Send binary data on a WebSocket - ArrayBufferView - Int32Array - Connection should be closed"
+    ]
+  },
+  "Send-binary-arraybufferview-uint16-offset-length.any.js": {
+    "note": "TODO(@KhafraDev): investigate failure",
+    "fail": [
+      "Send binary data on a WebSocket - ArrayBufferView - Uint16Array with offset and length - Connection should be closed"
+    ]
+  },
+  "Send-binary-arraybufferview-uint32-offset.any.js": {
+    "note": "TODO(@KhafraDev): investigate failure",
+    "fail": [
+      "Send binary data on a WebSocket - ArrayBufferView - Uint32Array with offset - Connection should be closed"
+    ]
+  },
+  "basic-auth.any.js": {
+    "note": "TODO(@KhafraDev): investigate failure",
+    "fail": [
+      "HTTP basic authentication should work with WebSockets"
+    ]
+  },
   "Create-on-worker-shutdown.any.js": {
     "skip": true,
     "//": "Node.js workers are different from web workers & don't work with blob: urls"
diff --git a/test/wpt/status/xhr.status.json b/test/wpt/status/xhr.status.json
deleted file mode 100644
index 9e26dfeeb6e..00000000000
--- a/test/wpt/status/xhr.status.json
+++ /dev/null
@@ -1 +0,0 @@
-{}
\ No newline at end of file
diff --git a/test/wpt/status/xhr/formdata.status.json b/test/wpt/status/xhr/formdata.status.json
new file mode 100644
index 00000000000..0967ef424bc
--- /dev/null
+++ b/test/wpt/status/xhr/formdata.status.json
@@ -0,0 +1 @@
+{}
diff --git a/test/wpt/tests/.azure-pipelines.yml b/test/wpt/tests/.azure-pipelines.yml
new file mode 100644
index 00000000000..3f824f68e0c
--- /dev/null
+++ b/test/wpt/tests/.azure-pipelines.yml
@@ -0,0 +1,543 @@
+# This is the configuration file for Azure Pipelines, used to run tests on
+# macOS and Windows. Documentation to help understand this setup:
+# https://docs.microsoft.com/en-us/azure/devops/pipelines/yaml-schema
+# https://docs.microsoft.com/en-us/azure/devops/pipelines/build/triggers
+# https://docs.microsoft.com/en-us/azure/devops/pipelines/process/multiple-phases
+# https://docs.microsoft.com/en-us/azure/devops/pipelines/process/templates
+# https://docs.microsoft.com/en-us/azure/devops/pipelines/process/variables
+# https://docs.microsoft.com/en-us/azure/devops/pipelines/tasks/index
+#
+# In addition to this configuration file, some setup in the Azure DevOps
+# project is required:
+#  - The "Build pull requests from forks of this repository" setting must be
+#    enabled: https://docs.microsoft.com/en-us/azure/devops/pipelines/repos/github#validate-contributions-from-forks
+
+trigger:
+# These are all the branches referenced in the jobs that follow.
+- epochs/daily
+- epochs/three_hourly
+- triggers/edge_stable
+- triggers/edge_dev
+- triggers/edge_canary
+- triggers/safari_stable
+- triggers/safari_preview
+
+# Set safaridriver_diagnose to true to enable safaridriver diagnostics. The
+# logs won't appear in `./wpt run` output but will be uploaded as an artifact.
+variables:
+  safaridriver_diagnose: false
+
+jobs:
+# The affected tests jobs are unconditional for speed, as most PRs have one or
+# more affected tests: https://github.com/web-platform-tests/wpt/issues/13936.
+- job: affected_safari_preview
+  displayName: 'affected tests: Safari Technology Preview'
+  condition: eq(variables['Build.Reason'], 'PullRequest')
+  pool:
+    vmImage: 'macOS-12'
+  steps:
+  - task: UsePythonVersion@0
+    inputs:
+      versionSpec: '3.10'
+  - template: tools/ci/azure/affected_tests.yml
+    parameters:
+      artifactName: 'safari-preview-affected-tests'
+- template: tools/ci/azure/fyi_hook.yml
+  parameters:
+    dependsOn: affected_safari_preview
+    artifactName: safari-preview-affected-tests
+
+- job: affected_without_changes_safari_preview
+  displayName: 'affected tests without changes: Safari Technology Preview'
+  condition: eq(variables['Build.Reason'], 'PullRequest')
+  pool:
+    vmImage: 'macOS-12'
+  steps:
+  - task: UsePythonVersion@0
+    inputs:
+      versionSpec: '3.10'
+  - template: tools/ci/azure/affected_tests.yml
+    parameters:
+      checkoutCommit: 'HEAD^1'
+      affectedRange: 'HEAD@{1}'
+      artifactName: 'safari-preview-affected-tests-without-changes'
+- template: tools/ci/azure/fyi_hook.yml
+  parameters:
+    dependsOn: affected_without_changes_safari_preview
+    artifactName: safari-preview-affected-tests-without-changes
+
+# The decision jobs runs `./wpt test-jobs` to determine which jobs to run,
+# and all following jobs wait for it to finish and depend on its output.
+- job: decision
+  displayName: './wpt test-jobs'
+  condition: eq(variables['Build.Reason'], 'PullRequest')
+  pool:
+    vmImage: 'ubuntu-20.04'
+  steps:
+  - task: UsePythonVersion@0
+    inputs:
+      versionSpec: '3.10'
+  - template: tools/ci/azure/checkout.yml
+  - script: |
+      set -eux -o pipefail
+      git fetch --depth 50 --quiet origin master
+      ./wpt test-jobs | while read job; do
+        echo "$job"
+        echo "##vso[task.setvariable variable=$job;isOutput=true]true";
+      done
+    name: test_jobs
+    displayName: 'Run ./wpt test-jobs'
+
+- job: infrastructure_mac
+  displayName: 'infrastructure/ tests: macOS'
+  dependsOn: decision
+  condition: dependencies.decision.outputs['test_jobs.wptrunner_infrastructure']
+  pool:
+    vmImage: 'macOS-12'
+  steps:
+  - task: UsePythonVersion@0
+    inputs:
+      versionSpec: '3.10'
+  - template: tools/ci/azure/checkout.yml
+  - template: tools/ci/azure/pip_install.yml
+    parameters:
+      packages: virtualenv
+  - template: tools/ci/azure/install_fonts.yml
+  - template: tools/ci/azure/install_certs.yml
+  - template: tools/ci/azure/install_chrome.yml
+  - template: tools/ci/azure/install_firefox.yml
+  - template: tools/ci/azure/install_safari.yml
+  - template: tools/ci/azure/update_hosts.yml
+  - template: tools/ci/azure/update_manifest.yml
+  - script: |
+      set -eux -o pipefail
+      ./wpt run --yes --no-manifest-update --manifest MANIFEST.json --metadata infrastructure/metadata/ --log-mach - --log-mach-level info --channel dev chrome infrastructure/
+    condition: succeededOrFailed()
+    displayName: 'Run tests (Chrome Dev)'
+  - script: |
+      set -eux -o pipefail
+      ./wpt run --yes --no-manifest-update --manifest MANIFEST.json --metadata infrastructure/metadata/ --log-mach - --log-mach-level info --channel nightly firefox infrastructure/
+    condition: succeededOrFailed()
+    displayName: 'Run tests (Firefox Nightly)'
+  - script: |
+      set -eux -o pipefail
+      export SYSTEM_VERSION_COMPAT=0
+      ./wpt run --yes --no-manifest-update --manifest MANIFEST.json --metadata infrastructure/metadata/ --log-mach - --log-mach-level info --channel preview safari infrastructure/
+    condition: succeededOrFailed()
+    displayName: 'Run tests (Safari Technology Preview)'
+  - template: tools/ci/azure/publish_logs.yml
+  - template: tools/ci/azure/sysdiagnose.yml
+
+- job: tools_unittest_mac_py37
+  displayName: 'tools/ unittests: macOS + Python 3.7'
+  dependsOn: decision
+  condition: dependencies.decision.outputs['test_jobs.tools_unittest']
+  pool:
+    vmImage: 'macOS-12'
+  steps:
+  - task: UsePythonVersion@0
+    inputs:
+      versionSpec: '3.7'
+  - template: tools/ci/azure/checkout.yml
+  - template: tools/ci/azure/tox_pytest.yml
+    parameters:
+      directory: tools/
+      toxenv: py37
+
+- job: tools_unittest_mac_py310
+  displayName: 'tools/ unittests: macOS + Python 3.10'
+  dependsOn: decision
+  condition: dependencies.decision.outputs['test_jobs.tools_unittest']
+  pool:
+    vmImage: 'macOS-12'
+  steps:
+  - task: UsePythonVersion@0
+    inputs:
+      versionSpec: '3.10'
+  - template: tools/ci/azure/checkout.yml
+  - template: tools/ci/azure/tox_pytest.yml
+    parameters:
+      directory: tools/
+      toxenv: py310
+
+- job: wptrunner_unittest_mac_py37
+  displayName: 'tools/wptrunner/ unittests: macOS + Python 3.7'
+  dependsOn: decision
+  condition: dependencies.decision.outputs['test_jobs.wptrunner_unittest']
+  pool:
+    vmImage: 'macOS-12'
+  steps:
+  - task: UsePythonVersion@0
+    inputs:
+      versionSpec: '3.7'
+  - template: tools/ci/azure/checkout.yml
+  - template: tools/ci/azure/tox_pytest.yml
+    parameters:
+      directory: tools/wptrunner/
+      toxenv: py37
+
+- job: wptrunner_unittest_mac_py310
+  displayName: 'tools/wptrunner/ unittests: macOS + Python 3.10'
+  dependsOn: decision
+  condition: dependencies.decision.outputs['test_jobs.wptrunner_unittest']
+  pool:
+    vmImage: 'macOS-12'
+  steps:
+  - task: UsePythonVersion@0
+    inputs:
+      versionSpec: '3.10'
+  - template: tools/ci/azure/checkout.yml
+  - template: tools/ci/azure/tox_pytest.yml
+    parameters:
+      directory: tools/wptrunner/
+      toxenv: py310
+
+- job: wpt_integration_mac_py37
+  displayName: 'tools/wpt/ tests: macOS + Python 3.7'
+  dependsOn: decision
+  condition: dependencies.decision.outputs['test_jobs.wpt_integration']
+  pool:
+    vmImage: 'macOS-12'
+  steps:
+  # full checkout required
+  - task: UsePythonVersion@0
+    inputs:
+      versionSpec: '3.7'
+  - template: tools/ci/azure/install_chrome.yml
+  - template: tools/ci/azure/install_firefox.yml
+  - template: tools/ci/azure/update_hosts.yml
+  - template: tools/ci/azure/update_manifest.yml
+  - template: tools/ci/azure/tox_pytest.yml
+    parameters:
+      directory: tools/wpt/
+      toxenv: py37
+
+- job: wpt_integration_mac_py310
+  displayName: 'tools/wpt/ tests: macOS + Python 3.10'
+  dependsOn: decision
+  condition: dependencies.decision.outputs['test_jobs.wpt_integration']
+  pool:
+    vmImage: 'macOS-12'
+  steps:
+  # full checkout required
+  - task: UsePythonVersion@0
+    inputs:
+      versionSpec: '3.10'
+  - template: tools/ci/azure/install_chrome.yml
+  - template: tools/ci/azure/install_firefox.yml
+  - template: tools/ci/azure/update_hosts.yml
+  - template: tools/ci/azure/update_manifest.yml
+  - template: tools/ci/azure/tox_pytest.yml
+    parameters:
+      directory: tools/wpt/
+      toxenv: py310
+
+- job: tools_unittest_win_py37
+  displayName: 'tools/ unittests: Windows + Python 3.6'
+  dependsOn: decision
+  condition: dependencies.decision.outputs['test_jobs.tools_unittest']
+  pool:
+    vmImage: 'windows-2019'
+  variables:
+    HYPOTHESIS_PROFILE: ci
+  steps:
+  - task: UsePythonVersion@0
+    inputs:
+      versionSpec: '3.6'
+      addToPath: false
+  - template: tools/ci/azure/checkout.yml
+  - template: tools/ci/azure/tox_pytest.yml
+    parameters:
+      directory: tools/
+      toxenv: py37
+
+- job: tools_unittest_win_py310
+  displayName: 'tools/ unittests: Windows + Python 3.10'
+  dependsOn: decision
+  condition: dependencies.decision.outputs['test_jobs.tools_unittest']
+  pool:
+    vmImage: 'windows-2019'
+  steps:
+  - task: UsePythonVersion@0
+    inputs:
+      versionSpec: '3.10'
+      addToPath: false
+  - template: tools/ci/azure/checkout.yml
+  - template: tools/ci/azure/tox_pytest.yml
+    parameters:
+      directory: tools/
+      toxenv: py310
+
+- job: wptrunner_unittest_win_py36
+  displayName: 'tools/wptrunner/ unittests: Windows + Python 3.6'
+  dependsOn: decision
+  condition: dependencies.decision.outputs['test_jobs.wptrunner_unittest']
+  pool:
+    vmImage: 'windows-2019'
+  steps:
+  - task: UsePythonVersion@0
+    inputs:
+      versionSpec: '3.6'
+      addToPath: false
+  - template: tools/ci/azure/checkout.yml
+  - template: tools/ci/azure/tox_pytest.yml
+    parameters:
+      directory: tools/wptrunner/
+      toxenv: py36
+
+- job: wptrunner_unittest_win_py310
+  displayName: 'tools/wptrunner/ unittests: Windows + Python 3.10'
+  dependsOn: decision
+  condition: dependencies.decision.outputs['test_jobs.wptrunner_unittest']
+  pool:
+    vmImage: 'windows-2019'
+  steps:
+  - task: UsePythonVersion@0
+    inputs:
+      versionSpec: '3.10'
+      addToPath: false
+  - template: tools/ci/azure/checkout.yml
+  - template: tools/ci/azure/tox_pytest.yml
+    parameters:
+      directory: tools/wptrunner/
+      toxenv: py310
+
+- job: wpt_integration_win_py36
+  displayName: 'tools/wpt/ tests: Windows + Python 3.6'
+  dependsOn: decision
+  condition: dependencies.decision.outputs['test_jobs.wpt_integration']
+  pool:
+    vmImage: 'windows-2019'
+  steps:
+  # full checkout required
+  - task: UsePythonVersion@0
+    inputs:
+      versionSpec: '3.6'
+  # currently just using the outdated Chrome/Firefox on the VM rather than
+  # figuring out how to install Chrome Dev channel on Windows
+  # - template: tools/ci/azure/install_chrome.yml
+  # - template: tools/ci/azure/install_firefox.yml
+  - template: tools/ci/azure/update_hosts.yml
+  - template: tools/ci/azure/update_manifest.yml
+  - template: tools/ci/azure/tox_pytest.yml
+    parameters:
+      directory: tools/wpt/
+      toxenv: py36
+
+- job: wpt_integration_win_py310
+  displayName: 'tools/wpt/ tests: Windows + Python 3.10'
+  dependsOn: decision
+  condition: dependencies.decision.outputs['test_jobs.wpt_integration']
+  pool:
+    vmImage: 'windows-2019'
+  steps:
+  # full checkout required
+  - task: UsePythonVersion@0
+    inputs:
+      versionSpec: '3.10'
+  # currently just using the outdated Chrome/Firefox on the VM rather than
+  # figuring out how to install Chrome Dev channel on Windows
+  # - template: tools/ci/azure/install_chrome.yml
+  # - template: tools/ci/azure/install_firefox.yml
+  - template: tools/ci/azure/update_hosts.yml
+  - template: tools/ci/azure/update_manifest.yml
+  - template: tools/ci/azure/tox_pytest.yml
+    parameters:
+      directory: tools/wpt/
+      toxenv: py310
+
+- job: results_edge_stable
+  displayName: 'all tests: Edge Stable'
+  condition: |
+    or(eq(variables['Build.SourceBranch'], 'refs/heads/epochs/daily'),
+       eq(variables['Build.SourceBranch'], 'refs/heads/triggers/edge_stable'),
+       and(eq(variables['Build.Reason'], 'Manual'), variables['run_all_edge_stable']))
+  strategy:
+    parallel: 8 # chosen to make runtime ~2h
+  timeoutInMinutes: 180
+  pool:
+    vmImage: 'windows-2019'
+  steps:
+  - task: UsePythonVersion@0
+    inputs:
+      versionSpec: '3.10'
+  - template: tools/ci/azure/system_info.yml
+  - template: tools/ci/azure/checkout.yml
+  - template: tools/ci/azure/pip_install.yml
+    parameters:
+      packages: virtualenv
+  - template: tools/ci/azure/install_certs.yml
+  - template: tools/ci/azure/install_edge.yml
+    parameters:
+      channel: stable
+  - template: tools/ci/azure/update_hosts.yml
+  - template: tools/ci/azure/update_manifest.yml
+  - script: python ./wpt run --yes --no-manifest-update --no-restart-on-unexpected --no-fail-on-unexpected --install-fonts --this-chunk $(System.JobPositionInPhase) --total-chunks $(System.TotalJobsInPhase) --chunk-type hash --log-wptreport $(Build.ArtifactStagingDirectory)/wpt_report_$(System.JobPositionInPhase).json --log-wptscreenshot $(Build.ArtifactStagingDirectory)/wpt_screenshot_$(System.JobPositionInPhase).txt --log-mach - --log-mach-level info --channel stable edgechromium
+    displayName: 'Run tests (Edge Stable)'
+  - task: PublishBuildArtifacts@1
+    displayName: 'Publish results'
+    inputs:
+      artifactName: 'edge-stable-results'
+  - template: tools/ci/azure/publish_logs.yml
+  - template: tools/ci/azure/sysdiagnose.yml
+- template: tools/ci/azure/fyi_hook.yml
+  parameters:
+    dependsOn: results_edge_stable
+    artifactName: edge-stable-results
+
+- job: results_edge_dev
+  displayName: 'all tests: Edge Dev'
+  condition: |
+    or(eq(variables['Build.SourceBranch'], 'refs/heads/epochs/three_hourly'),
+       eq(variables['Build.SourceBranch'], 'refs/heads/triggers/edge_dev'),
+       and(eq(variables['Build.Reason'], 'Manual'), variables['run_all_edge_dev']))
+  strategy:
+    parallel: 8 # chosen to make runtime ~2h
+  timeoutInMinutes: 180
+  pool:
+    vmImage: 'windows-2019'
+  steps:
+  - task: UsePythonVersion@0
+    inputs:
+      versionSpec: '3.10'
+  - template: tools/ci/azure/system_info.yml
+  - template: tools/ci/azure/checkout.yml
+  - template: tools/ci/azure/pip_install.yml
+    parameters:
+      packages: virtualenv
+  - template: tools/ci/azure/install_certs.yml
+  - template: tools/ci/azure/install_edge.yml
+    parameters:
+      channel: dev
+  - template: tools/ci/azure/update_hosts.yml
+  - template: tools/ci/azure/update_manifest.yml
+  - script: python ./wpt run --yes --no-manifest-update --no-restart-on-unexpected --no-fail-on-unexpected --install-fonts --this-chunk $(System.JobPositionInPhase) --total-chunks $(System.TotalJobsInPhase) --chunk-type hash --log-wptreport $(Build.ArtifactStagingDirectory)/wpt_report_$(System.JobPositionInPhase).json --log-wptscreenshot $(Build.ArtifactStagingDirectory)/wpt_screenshot_$(System.JobPositionInPhase).txt --log-mach - --log-mach-level info --channel dev edgechromium
+    displayName: 'Run tests (Edge Dev)'
+  - task: PublishBuildArtifacts@1
+    displayName: 'Publish results'
+    inputs:
+      artifactName: 'edge-dev-results'
+  - template: tools/ci/azure/publish_logs.yml
+  - template: tools/ci/azure/sysdiagnose.yml
+- template: tools/ci/azure/fyi_hook.yml
+  parameters:
+    dependsOn: results_edge_dev
+    artifactName: edge-dev-results
+
+- job: results_edge_canary
+  displayName: 'all tests: Edge Canary'
+  condition: |
+    or(eq(variables['Build.SourceBranch'], 'refs/heads/epochs/weekly'),
+       eq(variables['Build.SourceBranch'], 'refs/heads/triggers/edge_canary'),
+       and(eq(variables['Build.Reason'], 'Manual'), variables['run_all_edge_canary']))
+  strategy:
+    parallel: 8 # chosen to make runtime ~2h
+  timeoutInMinutes: 180
+  pool:
+    vmImage: 'windows-2019'
+  steps:
+  - task: UsePythonVersion@0
+    inputs:
+      versionSpec: '3.10'
+  - template: tools/ci/azure/checkout.yml
+  - template: tools/ci/azure/pip_install.yml
+    parameters:
+      packages: virtualenv
+  - template: tools/ci/azure/install_certs.yml
+  - template: tools/ci/azure/install_edge.yml
+    parameters:
+      channel: canary
+  - template: tools/ci/azure/update_hosts.yml
+  - template: tools/ci/azure/update_manifest.yml
+  - script: python ./wpt run --yes --no-manifest-update --no-restart-on-unexpected --no-fail-on-unexpected --install-fonts --this-chunk $(System.JobPositionInPhase) --total-chunks $(System.TotalJobsInPhase) --chunk-type hash --log-wptreport $(Build.ArtifactStagingDirectory)/wpt_report_$(System.JobPositionInPhase).json --log-wptscreenshot $(Build.ArtifactStagingDirectory)/wpt_screenshot_$(System.JobPositionInPhase).txt --log-mach - --log-mach-level info --channel canary edgechromium
+    displayName: 'Run tests (Edge Canary)'
+  - task: PublishBuildArtifacts@1
+    displayName: 'Publish results'
+    inputs:
+      artifactName: 'edge-canary-results'
+  - template: tools/ci/azure/publish_logs.yml
+  - template: tools/ci/azure/sysdiagnose.yml
+- template: tools/ci/azure/fyi_hook.yml
+  parameters:
+    dependsOn: results_edge_canary
+    artifactName: edge-canary-results
+
+- job: results_safari
+  displayName: 'all tests: Safari'
+  condition: |
+    or(eq(variables['Build.SourceBranch'], 'refs/heads/epochs/daily'),
+       eq(variables['Build.SourceBranch'], 'refs/heads/triggers/safari_stable'),
+       and(eq(variables['Build.Reason'], 'Manual'), variables['run_all_safari']))
+  strategy:
+    parallel: 8 # chosen to make runtime ~2h
+  timeoutInMinutes: 180
+  pool:
+    vmImage: 'macOS-12'
+  steps:
+  - task: UsePythonVersion@0
+    inputs:
+      versionSpec: '3.10'
+  - template: tools/ci/azure/checkout.yml
+  - template: tools/ci/azure/pip_install.yml
+    parameters:
+      packages: virtualenv
+  - template: tools/ci/azure/install_certs.yml
+  - template: tools/ci/azure/install_safari.yml
+    parameters:
+      channel: stable
+  - template: tools/ci/azure/update_hosts.yml
+  - template: tools/ci/azure/update_manifest.yml
+  - script: |
+      set -eux -o pipefail
+      export SYSTEM_VERSION_COMPAT=0
+      ./wpt run --no-manifest-update --no-restart-on-unexpected --no-fail-on-unexpected --this-chunk=$(System.JobPositionInPhase) --total-chunks=$(System.TotalJobsInPhase) --chunk-type hash --log-wptreport $(Build.ArtifactStagingDirectory)/wpt_report_$(System.JobPositionInPhase).json --log-wptscreenshot $(Build.ArtifactStagingDirectory)/wpt_screenshot_$(System.JobPositionInPhase).txt --log-mach - --log-mach-level info --channel stable --kill-safari safari
+    displayName: 'Run tests'
+  - task: PublishBuildArtifacts@1
+    displayName: 'Publish results'
+    inputs:
+      artifactName: 'safari-results'
+  - template: tools/ci/azure/publish_logs.yml
+  - template: tools/ci/azure/sysdiagnose.yml
+- template: tools/ci/azure/fyi_hook.yml
+  parameters:
+    dependsOn: results_safari
+    artifactName: safari-results
+
+- job: results_safari_preview
+  displayName: 'all tests: Safari Technology Preview'
+  condition: |
+    or(eq(variables['Build.SourceBranch'], 'refs/heads/epochs/three_hourly'),
+       eq(variables['Build.SourceBranch'], 'refs/heads/triggers/safari_preview'),
+       and(eq(variables['Build.Reason'], 'Manual'), variables['run_all_safari_preview']))
+  strategy:
+    parallel: 8 # chosen to make runtime ~2h
+  timeoutInMinutes: 180
+  pool:
+    vmImage: 'macOS-12'
+  steps:
+  - task: UsePythonVersion@0
+    inputs:
+      versionSpec: '3.10'
+  - template: tools/ci/azure/checkout.yml
+  - template: tools/ci/azure/pip_install.yml
+    parameters:
+      packages: virtualenv
+  - template: tools/ci/azure/install_certs.yml
+  - template: tools/ci/azure/install_safari.yml
+  - template: tools/ci/azure/update_hosts.yml
+  - template: tools/ci/azure/update_manifest.yml
+  - script: |
+      set -eux -o pipefail
+      export SYSTEM_VERSION_COMPAT=0
+      ./wpt run --no-manifest-update --no-restart-on-unexpected --no-fail-on-unexpected --this-chunk=$(System.JobPositionInPhase) --total-chunks=$(System.TotalJobsInPhase) --chunk-type hash --log-wptreport $(Build.ArtifactStagingDirectory)/wpt_report_$(System.JobPositionInPhase).json --log-wptscreenshot $(Build.ArtifactStagingDirectory)/wpt_screenshot_$(System.JobPositionInPhase).txt --log-mach - --log-mach-level info --channel preview --kill-safari safari
+    displayName: 'Run tests'
+  - task: PublishBuildArtifacts@1
+    displayName: 'Publish results'
+    inputs:
+      artifactName: 'safari-preview-results'
+  - template: tools/ci/azure/publish_logs.yml
+  - template: tools/ci/azure/sysdiagnose.yml
+- template: tools/ci/azure/fyi_hook.yml
+  parameters:
+    dependsOn: results_safari_preview
+    artifactName: safari-preview-results
diff --git a/test/wpt/tests/.gitattributes b/test/wpt/tests/.gitattributes
new file mode 100644
index 00000000000..5c11e4e33a7
--- /dev/null
+++ b/test/wpt/tests/.gitattributes
@@ -0,0 +1 @@
+*       -text
diff --git a/test/wpt/tests/.gitignore b/test/wpt/tests/.gitignore
new file mode 100644
index 00000000000..23f0370c4d0
--- /dev/null
+++ b/test/wpt/tests/.gitignore
@@ -0,0 +1,53 @@
+# Python
+*.py[co]
+.cache/
+.coverage*
+.mypy_cache/
+.pytest_cache/
+.tox/
+.virtualenv/
+_venv*/
+_virtualenv/
+
+# Node
+node_modules/
+
+# WPT repo stuff
+.wptcache/
+/MANIFEST.json
+/_certs
+/config.json
+
+# Files generated when regenerating pre-generated certs
+/tools/certs/0*.pem
+/tools/certs/index.txt*
+/tools/certs/serial*
+
+# Various OS/editor specific files
+*#
+*.orig
+*.rej
+*.svn
+*.sw[po]
+*.xcodeproj
+*Thumbs.db
+*~
+.DS_Store
+.directory*
+.idea/
+.vscode/
+\#*
+scratch
+
+# Testsuite-specific rules
+/conformance-checkers/vnu.jar
+/cors/resources/log.txt
+/css/build-temp
+/css/dist
+/css/dist_last
+/css/tools/cache
+/url/tools/IdnaTestV2.txt
+/webaudio/idl/*
+
+# w3c-test.org PR-branch mirroring
+/submissions/
diff --git a/test/wpt/tests/.mailmap b/test/wpt/tests/.mailmap
new file mode 100644
index 00000000000..5293948fc23
--- /dev/null
+++ b/test/wpt/tests/.mailmap
@@ -0,0 +1,9 @@
+# People who've changed name:
+
+# Sam Sneddon:
+Sam Sneddon <me@gsnedders.com>
+Sam Sneddon <me@gsnedders.com> <geoffers@gmail.com>
+
+# Theresa O'Connor:
+Theresa O'Connor <eoconnor@apple.com>
+Theresa O'Connor <hober0@gmail.com>
diff --git a/test/wpt/tests/.taskcluster.yml b/test/wpt/tests/.taskcluster.yml
new file mode 100644
index 00000000000..f830bff668f
--- /dev/null
+++ b/test/wpt/tests/.taskcluster.yml
@@ -0,0 +1,82 @@
+version: 1
+reporting: checks-v1
+policy:
+  pullRequests: public
+tasks:
+  $let:
+    run_task:
+      $if: 'tasks_for == "github-push"'
+      then:
+        $if: 'event.ref in ["refs/heads/master", "refs/heads/epochs/daily", "refs/heads/epochs/weekly", "refs/heads/triggers/chrome_stable", "refs/heads/triggers/chrome_beta", "refs/heads/triggers/chrome_dev", "refs/heads/triggers/chrome_nightly", "refs/heads/triggers/firefox_stable", "refs/heads/triggers/firefox_beta", "refs/heads/triggers/firefox_nightly", "refs/heads/triggers/webkitgtk_minibrowser_stable", "refs/heads/triggers/webkitgtk_minibrowser_beta", "refs/heads/triggers/webkitgtk_minibrowser_nightly", "refs/heads/triggers/servo_nightly"]'
+        then: true
+        else: false
+      else:
+        $if: 'tasks_for == "github-pull-request"'
+        then:
+          $if: 'event.action in ["opened", "reopened", "synchronize"]'
+          then: true
+          else: false
+        else: false
+  in:
+    - $if: run_task
+      then:
+        $let:
+          event_str: {$json: {$eval: event}}
+          scopes:
+            $if: 'tasks_for == "github-push"'
+            then:
+              $let:
+                branch:
+                  $if: "event.ref[:11] == 'refs/heads/'"
+                  then: "${event.ref[11:]}"
+                  else: "${event.ref}"
+              in: "assume:repo:github.com/${event.repository.full_name}:branch:${branch}"
+            else: "assume:repo:github.com/${event.repository.full_name}:pull-request"
+          rev:
+            $if: 'tasks_for == "github-pull-request"'
+            then: "refs/pull/${event.number}/merge"
+            else: "${event.after}"
+          owner:
+            $if: 'tasks_for == "github-push"'
+            then:
+              $if: 'event.pusher.email'
+              then:
+                $if: '"@" in event.pusher.email'
+                then: ${event.pusher.email}
+                else: web-platform-tests@users.noreply.github.com
+              else: web-platform-tests@users.noreply.github.com
+            else: web-platform-tests@users.noreply.github.com
+        in:
+          created: {$fromNow: ''}
+          deadline: {$fromNow: '24 hours'}
+          provisionerId: proj-wpt
+          workerType: ci
+          metadata:
+            name: "wpt-decision-task"
+            description: "The task that creates all of the other tasks in the task graph"
+            owner: ${owner}
+            source: ${event.repository.clone_url}
+          payload:
+            image: webplatformtests/wpt:0.52
+            maxRunTime: 7200
+            artifacts:
+              public/results:
+                path: /home/test/artifacts
+                type: directory
+            command:
+              - /bin/bash
+              - --login
+              - -c
+              - set -ex;
+                ~/start.sh
+                  ${event.repository.clone_url}
+                  ${rev};
+                cd ~/web-platform-tests;
+                ./wpt tc-decision --tasks-path=/home/test/artifacts/tasks.json
+            features :
+              taskclusterProxy: true
+          scopes:
+            - ${scopes}
+          extra:
+            github_event: "${event_str}"
+
diff --git a/test/wpt/tests/CODEOWNERS b/test/wpt/tests/CODEOWNERS
new file mode 100644
index 00000000000..2372633782e
--- /dev/null
+++ b/test/wpt/tests/CODEOWNERS
@@ -0,0 +1,9 @@
+# Prevent accidentially touching CSS subtree
+/css/tools/apiclient/ @plinss @web-platform-tests/wpt-core-team
+
+# Require review for changes that often need an RFC
+/resources/testdriver* @web-platform-tests/wpt-core-team
+/resources/testharness* @web-platform-tests/wpt-core-team
+
+# Prevent accidentally touching tools/third_party
+/tools/third_party/ @web-platform-tests/wpt-core-team
diff --git a/test/wpt/tests/CODE_OF_CONDUCT.md b/test/wpt/tests/CODE_OF_CONDUCT.md
new file mode 100644
index 00000000000..dae98ee0187
--- /dev/null
+++ b/test/wpt/tests/CODE_OF_CONDUCT.md
@@ -0,0 +1,138 @@
+# Code of Conduct
+
+Contact: a moderator ([see below](#moderators)), or a member of the WPT
+community that you feel you can trust.
+
+## Our Pledge
+
+We as members, contributors, and leaders pledge to make participation in our
+community a harassment-free experience for everyone, regardless of age, body
+size, visible or invisible disability, ethnicity, sex characteristics, gender
+identity and expression, level of experience, education, socio-economic status,
+nationality, personal appearance, race, religion, sexual identity and
+orientation, or any other dimension of diversity.
+
+We pledge to act and interact in ways that contribute to an open, welcoming,
+diverse, inclusive, and healthy community.
+
+## Our Standards
+
+Examples of behavior that contributes to a positive environment for our
+community include:
+
+* Demonstrating empathy and kindness toward other people
+* Being respectful of differing opinions, viewpoints, and experiences
+* Giving and gracefully accepting constructive feedback
+* Accepting responsibility and apologizing to those affected by our mistakes,
+  and learning from the experience
+* Focusing on what is best not just for us as individuals, but for the
+  overall community
+
+Examples of unacceptable behavior include:
+
+* The use of sexualized language or imagery, and sexual attention or
+  advances of any kind
+* Trolling, insulting or derogatory comments, and personal or political attacks
+* Public or private harassment
+* Publishing others' private information, such as a physical or email
+  address, without their explicit permission
+* Other conduct which could reasonably be considered inappropriate in a
+  professional setting
+
+## Enforcement Responsibilities
+
+Moderators are responsible for clarifying and enforcing our standards of
+acceptable behavior and will take appropriate and fair corrective action in
+response to any behavior that they deem inappropriate, threatening, offensive,
+or harmful.
+
+Moderators have the right and responsibility to remove, edit, or reject
+comments, commits, code, wiki edits, issues, and other contributions that are
+not aligned to this Code of Conduct, and will communicate reasons for moderation
+decisions when appropriate.
+
+Moderators are held to a higher standard than other community members. If a
+moderator creates an inappropriate situation, they should expect less leeway
+than others.
+
+## Scope
+
+This Code of Conduct applies within all community spaces, and also
+applies when an individual is officially representing the community in
+public spaces.  Examples of representing our community include
+the official Matrix channel (wpt:matrix.org); GitHub repositories under
+the web-platform-tests organization; and the public-test-infra@w3.org
+mailing list.
+
+There may arise situations where both the WPT code of conduct and that of
+another organization (such as the WHATWG or W3C) may apply.
+For example, a WPT-focused meeting at
+[TPAC](https://www.w3.org/2002/09/TPOverview.html) would involve both the WPT
+code of conduct and the [W3C code of ethics and professional
+conduct](https://www.w3.org/Consortium/cepc/).
+In such situations we operate under all code of conducts involved.
+If you are placed in a situation where you feel this is inappropriate (e.g. if
+you believe the code of conducts involved contradict one another), please
+contact a [moderator](#moderators).
+
+## Enforcement
+
+Instances of abusive, harassing, or otherwise unacceptable behavior may be
+reported to the [moderators](#moderators).
+All complaints will be reviewed and investigated promptly and fairly.
+
+All moderators are obligated to respect the privacy and security of the
+reporter of any incident.
+
+Moderators will recuse themselves if they are directly involved in a report of
+a code of conduct violation.
+
+## Enforcement Guidelines
+
+Moderators will follow these Community Impact Guidelines in determining
+the consequences for any action they deem in violation of this Code of Conduct.
+These are not a consecutive set of steps; a single incident may be sufficient
+enough to proceed straight to a temporary ban, for example.
+
+### 1. Warning
+
+**Community Impact**: A violation through a single incident or series
+of actions.
+
+**Consequence**: A warning with consequences for continued behavior, providing
+clarity around the nature of the violation and an explanation of why the
+behavior was inappropriate. A public apology may be requested.
+
+### 2. Temporary Ban
+
+**Community Impact**: A serious violation of community standards, including
+sustained inappropriate behavior.
+
+**Consequence**: A temporary ban from any sort of interaction or public
+communication with the community for a specified period of time. No public or
+private interaction with the people involved, including unsolicited interaction
+with those enforcing the Code of Conduct, is allowed during this period.
+Violating these terms may lead to a permanent ban.
+
+### 3. Permanent Ban
+
+**Community Impact**: Demonstrating a pattern of violation of community
+standards, including sustained inappropriate behavior,  harassment of an
+individual, or aggression toward or disparagement of classes of individuals.
+
+**Consequence**: A permanent ban from any sort of public interaction within
+the community.
+
+## Moderators
+
+This section lists the current moderators and how to reach them.
+
+* Nina Satragno - [nso@google.com](mailto:nso@google.com). Languages: English, Spanish.
+* Boaz Sender - [boaz@bocoup.com](mailto:boaz@bocoup.com). Languages: English, Hebrew.
+* Jory Burson - [jory@bocoup.education](mailto:jory@bocoup.education). Languages: English (fluent), Spanish (conversational).
+
+## Attribution
+
+This Code of Conduct is adapted from the Contributor Covenant,
+version 2.0, available at
+https://www.contributor-covenant.org/version/2/0/code_of_conduct.html.
diff --git a/test/wpt/tests/CONTRIBUTING.md b/test/wpt/tests/CONTRIBUTING.md
new file mode 100644
index 00000000000..cb80d8de3e4
--- /dev/null
+++ b/test/wpt/tests/CONTRIBUTING.md
@@ -0,0 +1,11 @@
+All contributions are licensed under the terms of the [3-Clause BSD License](LICENSE.md).
+
+Documentation
+-------------
+
+See [web-platform-tests.org](https://web-platform-tests.org/).
+
+Code of Conduct
+---------------
+
+See [CODE_OF_CONDUCT.md](CODE_OF_CONDUCT.md).
diff --git a/test/wpt/tests/FileAPI/Blob-methods-from-detached-frame.html b/test/wpt/tests/FileAPI/Blob-methods-from-detached-frame.html
new file mode 100644
index 00000000000..37efd5ed201
--- /dev/null
+++ b/test/wpt/tests/FileAPI/Blob-methods-from-detached-frame.html
@@ -0,0 +1,59 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Blob methods from detached frame work as expected</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+
+<iframe id="emptyDocumentIframe" src="../support/empty-document.html"></iframe>
+
+<script>
+const BlobPrototypeFromDetachedFramePromise = new Promise(resolve => {
+    emptyDocumentIframe.onload = () => {
+        const BlobPrototype = emptyDocumentIframe.contentWindow.Blob.prototype;
+        emptyDocumentIframe.remove();
+        resolve(BlobPrototype);
+    };
+});
+
+const charCodeArrayToString = charCodeArray => Array.from(charCodeArray, c => String.fromCharCode(c)).join("");
+const charCodeBufferToString = charCodeBuffer => charCodeArrayToString(new Uint8Array(charCodeBuffer));
+
+promise_test(async () => {
+    const { slice } = await BlobPrototypeFromDetachedFramePromise;
+    const blob = new Blob(["foobar"]);
+
+    const slicedBlob = slice.call(blob, 1, 3);
+    assert_true(slicedBlob instanceof Blob);
+
+    assert_equals(await slicedBlob.text(), "oo");
+    assert_equals(charCodeBufferToString(await slicedBlob.arrayBuffer()), "oo");
+
+    const reader = slicedBlob.stream().getReader();
+    const { value } = await reader.read();
+    assert_equals(charCodeArrayToString(value), "oo");
+}, "slice()");
+
+promise_test(async () => {
+    const { text } = await BlobPrototypeFromDetachedFramePromise;
+    const blob = new Blob(["foo"]);
+
+    assert_equals(await text.call(blob), "foo");
+}, "text()");
+
+promise_test(async () => {
+    const { arrayBuffer } = await BlobPrototypeFromDetachedFramePromise;
+    const blob = new Blob(["bar"]);
+
+    const charCodeBuffer = await arrayBuffer.call(blob);
+    assert_equals(charCodeBufferToString(charCodeBuffer), "bar");
+}, "arrayBuffer()");
+
+promise_test(async () => {
+    const { stream } = await BlobPrototypeFromDetachedFramePromise;
+    const blob = new Blob(["baz"]);
+
+    const reader = stream.call(blob).getReader();
+    const { value } = await reader.read();
+    assert_equals(charCodeArrayToString(value), "baz");
+}, "stream()");
+</script>
diff --git a/test/wpt/tests/FileAPI/BlobURL/cross-partition.tentative.https.html b/test/wpt/tests/FileAPI/BlobURL/cross-partition.tentative.https.html
new file mode 100644
index 00000000000..c75ce07d054
--- /dev/null
+++ b/test/wpt/tests/FileAPI/BlobURL/cross-partition.tentative.https.html
@@ -0,0 +1,276 @@
+<!DOCTYPE html>
+<meta charset=utf-8>
+<meta name="timeout" content="long">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/common/get-host-info.sub.js"></script>
+<script src="/common/utils.js"></script>
+<script src="/common/dispatcher/dispatcher.js"></script>
+<!-- Pull in executor_path needed by newPopup / newIframe -->
+<script src="/html/cross-origin-embedder-policy/credentialless/resources/common.js"></script>
+<!-- Pull in importScript / newPopup / newIframe -->
+<script src="/html/anonymous-iframe/resources/common.js"></script>
+<body>
+<script>
+
+const did_revoke_response = "URL.revokeObjectURL did revoke";
+const did_not_revoke_response = "URL.revokeObjectURL did not revoke";
+
+const can_blob_url_be_revoked_js = (blob_url, response_queue_name) => `
+  async function test() {
+    if (!('revokeObjectURL' in URL)) {
+      return send("${response_queue_name}", "URL.revokeObjectURL is not exposed");
+    }
+    try {
+      var blob = await fetch("${blob_url}").then(response => response.blob());
+      await blob.text();
+    } catch {
+      return send("${response_queue_name}", "Blob URL invalid");
+    }
+    try {
+      URL.revokeObjectURL("${blob_url}");
+    } catch(e) {
+      return send("${response_queue_name}", e.toString());
+    }
+    try {
+      const blob = await fetch("${blob_url}").then(response => response.blob());
+    } catch(e) {
+      return send("${response_queue_name}", "${did_revoke_response}");
+    }
+    return send("${response_queue_name}", "${did_not_revoke_response}");
+  }
+  await test();
+`;
+
+const add_iframe_js = (iframe_origin, response_queue_uuid) => `
+  const importScript = ${importScript};
+  await importScript("/html/cross-origin-embedder-policy/credentialless" +
+                   "/resources/common.js");
+  await importScript("/html/anonymous-iframe/resources/common.js");
+  await importScript("/common/utils.js");
+  await send("${response_queue_uuid}", newIframe("${iframe_origin}"));
+`;
+
+const same_site_origin = get_host_info().HTTPS_ORIGIN;
+const cross_site_origin = get_host_info().HTTPS_NOTSAMESITE_ORIGIN;
+
+async function create_test_iframes(t, response_queue_uuid) {
+
+  // Create a same-origin iframe in a cross-site popup.
+  const not_same_site_popup_uuid = newPopup(t, cross_site_origin);
+  await send(not_same_site_popup_uuid,
+       add_iframe_js(same_site_origin, response_queue_uuid));
+  const iframe_1_uuid = await receive(response_queue_uuid);
+
+  // Create a same-origin iframe in a same-site popup.
+  const same_origin_popup_uuid = newPopup(t, same_site_origin);
+  await send(same_origin_popup_uuid,
+       add_iframe_js(same_site_origin, response_queue_uuid));
+  const iframe_2_uuid = await receive(response_queue_uuid);
+
+  return [iframe_1_uuid, iframe_2_uuid];
+}
+
+promise_test(t => {
+  return new Promise(async (resolve, reject) => {
+    try {
+      const response_queue_uuid = token();
+
+      const [iframe_1_uuid, iframe_2_uuid] =
+        await create_test_iframes(t, response_queue_uuid);
+
+      const blob = new Blob(["blob data"], {type : "text/plain"});
+      const blob_url = window.URL.createObjectURL(blob);
+      t.add_cleanup(() => window.URL.revokeObjectURL(blob_url));
+
+      await send(iframe_1_uuid,
+           can_blob_url_be_revoked_js(blob_url, response_queue_uuid));
+      var response = await receive(response_queue_uuid);
+      if (response !== did_not_revoke_response) {
+        reject(`Blob URL was revoked in not-same-top-level-site iframe: ${response}`);
+      }
+
+      await send(iframe_2_uuid,
+           can_blob_url_be_revoked_js(blob_url, response_queue_uuid));
+      response = await receive(response_queue_uuid);
+      if (response !== did_revoke_response) {
+        reject(`Blob URL wasn't revoked in same-top-level-site iframe: ${response}`);
+      }
+
+      resolve();
+    } catch (e) {
+      reject(e);
+    }
+  });
+}, "Blob URL shouldn't be revocable from a cross-partition iframe");
+
+const newWorker = (origin) => {
+  const worker_token = token();
+  const worker_url = origin + executor_worker_path + `&uuid=${worker_token}`;
+  const worker = new Worker(worker_url);
+  return worker_token;
+}
+
+promise_test(t => {
+  return new Promise(async (resolve, reject) => {
+    try {
+      const response_queue_uuid = token();
+
+      const create_worker_js = (origin) => `
+        const importScript = ${importScript};
+        await importScript("/html/cross-origin-embedder-policy/credentialless" +
+                         "/resources/common.js");
+        await importScript("/html/anonymous-iframe/resources/common.js");
+        await importScript("/common/utils.js");
+        const newWorker = ${newWorker};
+        await send("${response_queue_uuid}", newWorker("${origin}"));
+      `;
+
+      const [iframe_1_uuid, iframe_2_uuid] =
+        await create_test_iframes(t, response_queue_uuid);
+
+      // Create a dedicated worker in the cross-top-level-site iframe.
+      await send(iframe_1_uuid, create_worker_js(same_site_origin));
+      const worker_1_uuid = await receive(response_queue_uuid);
+
+      // Create a dedicated worker in the same-top-level-site iframe.
+      await send(iframe_2_uuid, create_worker_js(same_site_origin));
+      const worker_2_uuid = await receive(response_queue_uuid);
+
+      const blob = new Blob(["blob data"], {type : "text/plain"});
+      const blob_url = window.URL.createObjectURL(blob);
+      t.add_cleanup(() => window.URL.revokeObjectURL(blob_url));
+
+      await send(worker_1_uuid,
+           can_blob_url_be_revoked_js(blob_url, response_queue_uuid));
+      var response = await receive(response_queue_uuid);
+      if (response !== did_not_revoke_response) {
+        reject(`Blob URL was revoked in not-same-top-level-site dedicated worker: ${response}`);
+      }
+
+      await send(worker_2_uuid,
+           can_blob_url_be_revoked_js(blob_url, response_queue_uuid));
+      response = await receive(response_queue_uuid);
+      if (response !== did_revoke_response) {
+        reject(`Blob URL wasn't revoked in same-top-level-site dedicated worker: ${response}`);
+      }
+
+      resolve();
+    } catch (e) {
+      reject(e);
+    }
+  });
+}, "Blob URL shouldn't be revocable from a cross-partition dedicated worker");
+
+const newSharedWorker = (origin) => {
+  const worker_token = token();
+  const worker_url = origin + executor_worker_path + `&uuid=${worker_token}`;
+  const worker = new SharedWorker(worker_url, worker_token);
+  return worker_token;
+}
+
+promise_test(t => {
+  return new Promise(async (resolve, reject) => {
+    try {
+      const response_queue_uuid = token();
+
+      const create_worker_js = (origin) => `
+        const importScript = ${importScript};
+        await importScript("/html/cross-origin-embedder-policy/credentialless" +
+                         "/resources/common.js");
+        await importScript("/html/anonymous-iframe/resources/common.js");
+        await importScript("/common/utils.js");
+        const newSharedWorker = ${newSharedWorker};
+        await send("${response_queue_uuid}", newSharedWorker("${origin}"));
+      `;
+
+      const [iframe_1_uuid, iframe_2_uuid] =
+        await create_test_iframes(t, response_queue_uuid);
+
+      // Create a shared worker in the cross-top-level-site iframe.
+      await send(iframe_1_uuid, create_worker_js(same_site_origin));
+      const worker_1_uuid = await receive(response_queue_uuid);
+
+      // Create a shared worker in the same-top-level-site iframe.
+      await send(iframe_2_uuid, create_worker_js(same_site_origin));
+      const worker_2_uuid = await receive(response_queue_uuid);
+
+      const blob = new Blob(["blob data"], {type : "text/plain"});
+      const blob_url = window.URL.createObjectURL(blob);
+      t.add_cleanup(() => window.URL.revokeObjectURL(blob_url));
+
+      await send(worker_1_uuid,
+           can_blob_url_be_revoked_js(blob_url, response_queue_uuid));
+      var response = await receive(response_queue_uuid);
+      if (response !== did_not_revoke_response) {
+        reject(`Blob URL was revoked in not-same-top-level-site shared worker: ${response}`);
+      }
+
+      await send(worker_2_uuid,
+           can_blob_url_be_revoked_js(blob_url, response_queue_uuid));
+      response = await receive(response_queue_uuid);
+      if (response !== did_revoke_response) {
+        reject(`Blob URL wasn't revoked in same-top-level-site shared worker: ${response}`);
+      }
+
+      resolve();
+    } catch (e) {
+      reject(e);
+    }
+  });
+}, "Blob URL shouldn't be revocable from a cross-partition shared worker");
+
+const newServiceWorker = async (origin) => {
+  const worker_token = token();
+  const worker_url = origin + executor_service_worker_path +
+                     `&uuid=${worker_token}`;
+  const worker_url_path = executor_service_worker_path.substring(0,
+                              executor_service_worker_path.lastIndexOf('/'));
+  const scope = worker_url_path + "/not-used/";
+  const reg = await navigator.serviceWorker.register(worker_url,
+                                                     {'scope': scope});
+  return worker_token;
+}
+
+promise_test(t => {
+  return new Promise(async (resolve, reject) => {
+    try {
+      const response_queue_uuid = token();
+
+      const create_worker_js = (origin) => `
+        const importScript = ${importScript};
+        await importScript("/html/cross-origin-embedder-policy/credentialless" +
+                         "/resources/common.js");
+        await importScript("/html/anonymous-iframe/resources/common.js");
+        await importScript("/common/utils.js");
+        const newServiceWorker = ${newServiceWorker};
+        await send("${response_queue_uuid}", await newServiceWorker("${origin}"));
+      `;
+
+      const [iframe_1_uuid, iframe_2_uuid] =
+        await create_test_iframes(t, response_queue_uuid);
+
+      // Create a service worker in either iframe.
+      await send(iframe_1_uuid, create_worker_js(same_site_origin));
+      var worker_1_uuid = await receive(response_queue_uuid);
+      t.add_cleanup(() =>
+        send(worker_1_uuid, "self.registration.unregister();"));
+
+      const blob = new Blob(["blob data"], {type : "text/plain"});
+      const blob_url = window.URL.createObjectURL(blob);
+      t.add_cleanup(() => window.URL.revokeObjectURL(blob_url));
+
+      await send(worker_1_uuid,
+           can_blob_url_be_revoked_js(blob_url, response_queue_uuid));
+      const response = await receive(response_queue_uuid);
+      if (response !== "URL.revokeObjectURL is not exposed") {
+        reject(`URL.revokeObjectURL is exposed in a Service Worker context: ${response}`);
+      }
+      resolve();
+    } catch (e) {
+      reject(e);
+    }
+  });
+}, "Blob URL shouldn't be revocable from a service worker");
+</script>
+</body>
diff --git a/test/wpt/tests/FileAPI/BlobURL/support/file_test2.txt b/test/wpt/tests/FileAPI/BlobURL/support/file_test2.txt
new file mode 100644
index 00000000000..e69de29bb2d
diff --git a/test/wpt/tests/FileAPI/BlobURL/test2-manual.html b/test/wpt/tests/FileAPI/BlobURL/test2-manual.html
new file mode 100644
index 00000000000..07fb27ef8af
--- /dev/null
+++ b/test/wpt/tests/FileAPI/BlobURL/test2-manual.html
@@ -0,0 +1,62 @@
+<!DOCTYPE html>
+<html>
+<head>
+    <meta charset="utf-8">
+    <title>Blob and File reference URL Test(2)</title>
+    <link rel=help href="http://dev.w3.org/2006/webapi/FileAPI/#convenienceAPI">
+    <link rel=author title="Breezewish" href="mailto:me@breeswish.org">
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+</head>
+<body>
+    <form name="upload">
+        <input type="file" id="fileChooser"><br><input type="button" id="start" value="start">
+    </form>
+
+    <div>
+        <p>Test steps:</p>
+        <ol>
+            <li>Download the <a href="support/file_test2.txt">file</a>.</li>
+            <li>Select the file in the file inputbox.</li>
+            <li>Delete the file.</li>
+            <li>Click the 'start' button.</li>
+        </ol>
+    </div>
+
+    <div id="log"></div>
+
+    <script>
+
+        var fileChooser = document.querySelector('#fileChooser');
+
+        setup({explicit_done: true});
+        setup({explicit_timeout: true});
+
+        on_event(document.querySelector('#start'), 'click', function() {
+
+            async_test(function(t) {
+
+                var url = URL.createObjectURL(fileChooser.files[0]);
+
+                var xhr = new XMLHttpRequest();
+                xhr.open('GET', url, true);
+                xhr.onreadystatechange = t.step_func(function() {
+                    switch (xhr.readyState) {
+                    case xhr.DONE:
+                        assert_equals(xhr.status, 500, 'status code should be 500.');
+                        t.done();
+                        return;
+                    }
+                });
+
+                xhr.send();
+
+            }, 'Check whether the browser response 500 in XHR if the selected file which File/Blob URL refered is not found');
+
+            done();
+
+        });
+
+    </script>
+</body>
+</html>
diff --git a/test/wpt/tests/FileAPI/FileReader/progress_event_bubbles_cancelable.html b/test/wpt/tests/FileAPI/FileReader/progress_event_bubbles_cancelable.html
new file mode 100644
index 00000000000..6a03243f934
--- /dev/null
+++ b/test/wpt/tests/FileAPI/FileReader/progress_event_bubbles_cancelable.html
@@ -0,0 +1,33 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>File API Test: Progress Event - bubbles, cancelable</title>
+<link rel="author" title="Intel" href="http://www.intel.com">
+<link rel="help" href="http://www.w3.org/TR/FileAPI/#events">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<div id="log"></div>
+<script>
+  async_test(function(){
+    var blob = new Blob(["TEST"]);
+    var reader = new FileReader();
+
+    reader.onloadstart = this.step_func(function(evt) {
+      assert_false(evt.bubbles, "The bubbles must be false when the event is dispatched");
+      assert_false(evt.cancelable, "The cancelable must be false when the event is dispatched");
+    });
+
+    reader.onload = this.step_func(function(evt) {
+      assert_false(evt.bubbles, "The bubbles must be false when the event is dispatched");
+      assert_false(evt.cancelable, "The cancelable must be false when the event is dispatched");
+    });
+
+    reader.onloadend = this.step_func(function(evt) {
+      assert_false(evt.bubbles, "The bubbles must be false when the event is dispatched");
+      assert_false(evt.cancelable, "The cancelable must be false when the event is dispatched");
+      this.done();
+    });
+
+    reader.readAsText(blob);
+  }, "Check the values of bubbles and cancelable are false when the progress event is dispatched");
+</script>
+
diff --git a/test/wpt/tests/FileAPI/FileReader/support/file_test1.txt b/test/wpt/tests/FileAPI/FileReader/support/file_test1.txt
new file mode 100644
index 00000000000..e69de29bb2d
diff --git a/test/wpt/tests/FileAPI/FileReader/test_errors-manual.html b/test/wpt/tests/FileAPI/FileReader/test_errors-manual.html
new file mode 100644
index 00000000000..b8c3f84d2bf
--- /dev/null
+++ b/test/wpt/tests/FileAPI/FileReader/test_errors-manual.html
@@ -0,0 +1,72 @@
+<!DOCTYPE html>
+<html>
+<head>
+    <meta charset="utf-8">
+    <title>FileReader Errors Test</title>
+    <link rel=help href="http://dev.w3.org/2006/webapi/FileAPI/#convenienceAPI">
+    <link rel=author title="Breezewish" href="mailto:me@breeswish.org">
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+</head>
+<body>
+    <form name="upload">
+        <input type="file" id="fileChooser"><br><input type="button" id="start" value="start">
+    </form>
+
+    <div>
+        <p>Test steps:</p>
+        <ol>
+            <li>Download the <a href="support/file_test1.txt">file</a>.</li>
+            <li>Select the file in the file inputbox.</li>
+            <li>Delete the file.</li>
+            <li>Click the 'start' button.</li>
+        </ol>
+    </div>
+
+    <div id="log"></div>
+
+    <script>
+
+        var fileChooser = document.querySelector('#fileChooser');
+
+        setup({explicit_done: true});
+        setup({explicit_timeout: true});
+
+        on_event(fileChooser, 'change', function() {
+
+            async_test(function(t) {
+
+                var reader = new FileReader();
+                reader.readAsArrayBuffer(fileChooser.files[0]);
+
+                reader.onloadend = t.step_func_done(function(event) {
+                    assert_equals(event.target.readyState, FileReader.DONE);
+                    assert_equals(reader.error, null);
+                });
+
+            }, 'FileReader.error should be null if there are no errors when reading');
+
+        });
+
+        on_event(document.querySelector('#start'), 'click', function() {
+
+            async_test(function(t) {
+
+                var reader = new FileReader();
+                reader.readAsArrayBuffer(fileChooser.files[0]);
+
+                reader.onloadend = t.step_func_done(function(event) {
+                    assert_equals(event.target.readyState, FileReader.DONE);
+                    assert_equals(reader.error.code, 8);
+                    assert_true(reader.error instanceof DOMException);
+                });
+
+            }, 'FileReader.error should be NOT_FOUND_ERR if the file is not found when reading');
+
+            done();
+
+        });
+
+    </script>
+</body>
+</html>
diff --git a/test/wpt/tests/FileAPI/FileReader/test_notreadableerrors-manual.html b/test/wpt/tests/FileAPI/FileReader/test_notreadableerrors-manual.html
new file mode 100644
index 00000000000..46d73598a0f
--- /dev/null
+++ b/test/wpt/tests/FileAPI/FileReader/test_notreadableerrors-manual.html
@@ -0,0 +1,42 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>FileReader NotReadableError Test</title>
+<link rel="author" title="Intel" href="http://www.intel.com">
+<link rel="help" href="https://w3c.github.io/FileAPI/#dfn-error-codes">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<form name="upload">
+  <input type="file" id="fileChooser"><br><input type="button" id="start" value="start">
+</form>
+
+<div>
+  <p>Test steps:</p>
+  <ol>
+    <li>Download the <a href="support/file_test1.txt">file</a>.</li>
+    <li>Select the file in the file inputbox.</li>
+    <li>Delete the file's readable permission.</li>
+    <li>Click the 'start' button.</li>
+  </ol>
+</div>
+
+<script>
+
+  const fileChooser = document.querySelector('#fileChooser');
+
+  setup({explicit_done: true});
+  setup({explicit_timeout: true});
+
+  on_event(document.querySelector('#start'), 'click', () => {
+    async_test(t => {
+      const reader = new FileReader();
+      reader.readAsArrayBuffer(fileChooser.files[0]);
+      reader.onloadend = t.step_func_done(event => {
+        assert_equals(event.target.readyState, FileReader.DONE);
+        assert_equals(reader.error.name, "NotReadableError");
+      });
+    }, 'FileReader.error should be NotReadableError if the file is unreadable');
+    done();
+  });
+
+</script>
+
diff --git a/test/wpt/tests/FileAPI/FileReader/test_securityerrors-manual.html b/test/wpt/tests/FileAPI/FileReader/test_securityerrors-manual.html
new file mode 100644
index 00000000000..add93ed69d1
--- /dev/null
+++ b/test/wpt/tests/FileAPI/FileReader/test_securityerrors-manual.html
@@ -0,0 +1,40 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>FileReader SecurityError Test</title>
+<link rel="author" title="Intel" href="http://www.intel.com">
+<link rel="help" href="https://w3c.github.io/FileAPI/#dfn-error-codes">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<form name="upload">
+  <input type="file" id="fileChooser"><br><input type="button" id="start" value="start">
+</form>
+
+<div>
+  <p>Test steps:</p>
+  <ol>
+    <li>Select a system sensitive file (e.g. files in /usr/bin, password files,
+        and other native operating system executables) in the file inputbox.</li>
+    <li>Click the 'start' button.</li>
+    </ol>
+</div>
+
+<script>
+
+  const fileChooser = document.querySelector('#fileChooser');
+
+  setup({explicit_done: true});
+  setup({explicit_timeout: true});
+
+  on_event(document.querySelector('#start'), 'click', () => {
+    async_test(t => {
+      const reader = new FileReader();
+      reader.readAsArrayBuffer(fileChooser.files[0]);
+      reader.onloadend = t.step_func_done(event => {
+        assert_equals(event.target.readyState, FileReader.DONE);
+        assert_equals(reader.error.name, "SecurityError");
+      });
+    }, 'FileReader.error should be SECURITY_ERROR if the file is a system sensitive file');
+    done();
+  });
+
+</script>
diff --git a/test/wpt/tests/FileAPI/FileReader/workers.html b/test/wpt/tests/FileAPI/FileReader/workers.html
new file mode 100644
index 00000000000..8e114eeaf86
--- /dev/null
+++ b/test/wpt/tests/FileAPI/FileReader/workers.html
@@ -0,0 +1,27 @@
+<!DOCTYPE html>
+<meta charset=utf-8>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script>
+
+async_test(t => {
+  function workerCode() {
+    close();
+    var blob = new Blob([123]);
+    var fr = new FileReader();
+    fr.readAsText(blob);
+    fr.abort()
+    fr.readAsArrayBuffer(blob);
+    postMessage(true);
+  }
+
+  var workerBlob = new Blob([workerCode.toString() + ";workerCode();"], {type:"application/javascript"});
+
+  var w = new Worker(URL.createObjectURL(workerBlob));
+  w.onmessage = function(e) {
+    assert_true(e.data, "FileReader created during worker shutdown.");
+    t.done();
+  }
+}, 'FileReader created after a worker self.close()');
+
+</script>
diff --git a/test/wpt/tests/FileAPI/FileReaderSync.worker.js b/test/wpt/tests/FileAPI/FileReaderSync.worker.js
new file mode 100644
index 00000000000..3d7a0222f31
--- /dev/null
+++ b/test/wpt/tests/FileAPI/FileReaderSync.worker.js
@@ -0,0 +1,56 @@
+importScripts("/resources/testharness.js");
+
+var blob, empty_blob, readerSync;
+setup(() => {
+    readerSync = new FileReaderSync();
+    blob = new Blob(["test"]);
+    empty_blob = new Blob();
+});
+
+test(() => {
+    assert_true(readerSync instanceof FileReaderSync);
+}, "Interface");
+
+test(() => {
+    var text = readerSync.readAsText(blob);
+    assert_equals(text, "test");
+}, "readAsText");
+
+test(() => {
+    var text = readerSync.readAsText(empty_blob);
+    assert_equals(text, "");
+}, "readAsText with empty blob");
+
+test(() => {
+    var data = readerSync.readAsDataURL(blob);
+    assert_equals(data.indexOf("data:"), 0);
+}, "readAsDataURL");
+
+test(() => {
+    var data = readerSync.readAsDataURL(empty_blob);
+    assert_equals(data.indexOf("data:"), 0);
+}, "readAsDataURL with empty blob");
+
+test(() => {
+    var data = readerSync.readAsBinaryString(blob);
+    assert_equals(data, "test");
+}, "readAsBinaryString");
+
+test(() => {
+    var data = readerSync.readAsBinaryString(empty_blob);
+    assert_equals(data, "");
+}, "readAsBinaryString with empty blob");
+
+test(() => {
+    var data = readerSync.readAsArrayBuffer(blob);
+    assert_true(data instanceof ArrayBuffer);
+    assert_equals(data.byteLength, "test".length);
+}, "readAsArrayBuffer");
+
+test(() => {
+    var data = readerSync.readAsArrayBuffer(empty_blob);
+    assert_true(data instanceof ArrayBuffer);
+    assert_equals(data.byteLength, 0);
+}, "readAsArrayBuffer with empty blob");
+
+done();
diff --git a/test/wpt/tests/FileAPI/META.yml b/test/wpt/tests/FileAPI/META.yml
new file mode 100644
index 00000000000..506a59fec1e
--- /dev/null
+++ b/test/wpt/tests/FileAPI/META.yml
@@ -0,0 +1,6 @@
+spec: https://w3c.github.io/FileAPI/
+suggested_reviewers:
+  - inexorabletash
+  - zqzhang
+  - jdm
+  - mkruisselbrink
diff --git a/test/wpt/tests/FileAPI/blob/Blob-array-buffer.any.js b/test/wpt/tests/FileAPI/blob/Blob-array-buffer.any.js
new file mode 100644
index 00000000000..2310646e5fd
--- /dev/null
+++ b/test/wpt/tests/FileAPI/blob/Blob-array-buffer.any.js
@@ -0,0 +1,45 @@
+// META: title=Blob Array Buffer
+// META: script=../support/Blob.js
+'use strict';
+
+promise_test(async () => {
+  const input_arr = new TextEncoder().encode("PASS");
+  const blob = new Blob([input_arr]);
+  const array_buffer = await blob.arrayBuffer();
+  assert_true(array_buffer instanceof ArrayBuffer);
+  assert_equals_typed_array(new Uint8Array(array_buffer), input_arr);
+}, "Blob.arrayBuffer()")
+
+promise_test(async () => {
+  const input_arr = new TextEncoder().encode("");
+  const blob = new Blob([input_arr]);
+  const array_buffer = await blob.arrayBuffer();
+  assert_true(array_buffer instanceof ArrayBuffer);
+  assert_equals_typed_array(new Uint8Array(array_buffer), input_arr);
+}, "Blob.arrayBuffer() empty Blob data")
+
+promise_test(async () => {
+  const input_arr = new TextEncoder().encode("\u08B8\u000a");
+  const blob = new Blob([input_arr]);
+  const array_buffer = await blob.arrayBuffer();
+  assert_equals_typed_array(new Uint8Array(array_buffer), input_arr);
+}, "Blob.arrayBuffer() non-ascii input")
+
+promise_test(async () => {
+  const input_arr = [8, 241, 48, 123, 151];
+  const typed_arr = new Uint8Array(input_arr);
+  const blob = new Blob([typed_arr]);
+  const array_buffer = await blob.arrayBuffer();
+  assert_equals_typed_array(new Uint8Array(array_buffer), typed_arr);
+}, "Blob.arrayBuffer() non-unicode input")
+
+promise_test(async () => {
+  const input_arr = new TextEncoder().encode("PASS");
+  const blob = new Blob([input_arr]);
+  const array_buffer_results = await Promise.all([blob.arrayBuffer(),
+      blob.arrayBuffer(), blob.arrayBuffer()]);
+  for (let array_buffer of array_buffer_results) {
+    assert_true(array_buffer instanceof ArrayBuffer);
+    assert_equals_typed_array(new Uint8Array(array_buffer), input_arr);
+  }
+}, "Blob.arrayBuffer() concurrent reads")
diff --git a/test/wpt/tests/FileAPI/blob/Blob-constructor-dom.window.js b/test/wpt/tests/FileAPI/blob/Blob-constructor-dom.window.js
new file mode 100644
index 00000000000..4fd4a43ec4b
--- /dev/null
+++ b/test/wpt/tests/FileAPI/blob/Blob-constructor-dom.window.js
@@ -0,0 +1,53 @@
+// META: title=Blob constructor
+// META: script=../support/Blob.js
+'use strict';
+
+var test_error = {
+  name: "test",
+  message: "test error",
+};
+
+test(function() {
+  var args = [
+    document.createElement("div"),
+    window,
+  ];
+  args.forEach(function(arg) {
+    assert_throws_js(TypeError, function() {
+      new Blob(arg);
+    }, "Should throw for argument " + format_value(arg) + ".");
+  });
+}, "Passing platform objects for blobParts should throw a TypeError.");
+
+test(function() {
+  var element = document.createElement("div");
+  element.appendChild(document.createElement("div"));
+  element.appendChild(document.createElement("p"));
+  var list = element.children;
+  Object.defineProperty(list, "length", {
+    get: function() { throw test_error; }
+  });
+  assert_throws_exactly(test_error, function() {
+    new Blob(list);
+  });
+}, "A platform object that supports indexed properties should be treated as a sequence for the blobParts argument (overwritten 'length'.)");
+
+test_blob(function() {
+  var select = document.createElement("select");
+  select.appendChild(document.createElement("option"));
+  return new Blob(select);
+}, {
+  expected: "[object HTMLOptionElement]",
+  type: "",
+  desc: "Passing an platform object that supports indexed properties as the blobParts array should work (select)."
+});
+
+test_blob(function() {
+  var elm = document.createElement("div");
+  elm.setAttribute("foo", "bar");
+  return new Blob(elm.attributes);
+}, {
+  expected: "[object Attr]",
+  type: "",
+  desc: "Passing an platform object that supports indexed properties as the blobParts array should work (attributes)."
+});
\ No newline at end of file
diff --git a/test/wpt/tests/FileAPI/blob/Blob-constructor-endings.html b/test/wpt/tests/FileAPI/blob/Blob-constructor-endings.html
new file mode 100644
index 00000000000..04edd2a303b
--- /dev/null
+++ b/test/wpt/tests/FileAPI/blob/Blob-constructor-endings.html
@@ -0,0 +1,104 @@
+<!DOCTYPE html>
+<meta charset=utf-8>
+<title>Blob constructor: endings option</title>
+<link rel=help href="https://w3c.github.io/FileAPI/#constructorBlob">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script>
+
+// Windows platforms use CRLF as the native line ending. All others use LF.
+const crlf = navigator.platform.startsWith('Win');
+const native_ending = crlf ? '\r\n' : '\n';
+
+function readBlobAsPromise(blob) {
+  return new Promise((resolve, reject) => {
+    const reader = new FileReader();
+    reader.readAsText(blob);
+    reader.onload = e => resolve(reader.result);
+    reader.onerror = e => reject(reader.error);
+  });
+}
+
+[
+  'transparent',
+  'native'
+].forEach(value => test(t => {
+  assert_class_string(new Blob([], {endings: value}), 'Blob',
+                      `Constructor should allow "${value}" endings`);
+}, `Valid "endings" value: ${JSON.stringify(value)}`));
+
+[
+  null,
+  '',
+  'invalidEnumValue',
+  'Transparent',
+  'NATIVE',
+  0,
+  {}
+].forEach(value => test(t => {
+  assert_throws_js(TypeError, () => new Blob([], {endings: value}),
+                   'Blob constructor should throw');
+}, `Invalid "endings" value: ${JSON.stringify(value)}`));
+
+test(t => {
+  const test_error = {name: 'test'};
+  assert_throws_exactly(
+    test_error,
+    () => new Blob([], { get endings() { throw test_error; }}),
+    'Blob constructor should propagate exceptions from "endings" property');
+}, 'Exception propagation from options');
+
+test(t => {
+  let got = false;
+  new Blob([], { get endings() { got = true; } });
+  assert_true(got, 'The "endings" property was accessed during construction.');
+}, 'The "endings" options property is used');
+
+[
+  {name: 'LF', input: '\n', native: native_ending},
+  {name: 'CR', input: '\r', native: native_ending},
+
+  {name: 'CRLF', input: '\r\n', native: native_ending},
+  {name: 'CRCR', input: '\r\r', native: native_ending.repeat(2)},
+  {name: 'LFCR', input: '\n\r', native: native_ending.repeat(2)},
+  {name: 'LFLF', input: '\n\n', native: native_ending.repeat(2)},
+
+  {name: 'CRCRLF', input: '\r\r\n', native: native_ending.repeat(2)},
+  {name: 'CRLFLF', input: '\r\n\n', native: native_ending.repeat(2)},
+  {name: 'CRLFCR', input: '\r\n\r\n', native: native_ending.repeat(2)},
+
+  {name: 'CRLFCRLF', input: '\r\n\r\n', native: native_ending.repeat(2)},
+  {name: 'LFCRLFCR', input: '\n\r\n\r', native: native_ending.repeat(3)},
+
+].forEach(testCase => {
+  promise_test(async t => {
+    const blob = new Blob([testCase.input]);
+    assert_equals(
+      await readBlobAsPromise(blob), testCase.input,
+      'Newlines should not change with endings unspecified');
+  }, `Input ${testCase.name} with endings unspecified`);
+
+  promise_test(async t => {
+    const blob = new Blob([testCase.input], {endings: 'transparent'});
+    assert_equals(
+      await readBlobAsPromise(blob), testCase.input,
+      'Newlines should not change with endings "transparent"');
+  }, `Input ${testCase.name} with endings 'transparent'`);
+
+  promise_test(async t => {
+    const blob = new Blob([testCase.input], {endings: 'native'});
+    assert_equals(
+      await readBlobAsPromise(blob), testCase.native,
+      'Newlines should match the platform with endings "native"');
+  }, `Input ${testCase.name} with endings 'native'`);
+});
+
+promise_test(async t => {
+  const blob = new Blob(['\r', '\n'], {endings: 'native'});
+  const expected = native_ending.repeat(2);
+  assert_equals(
+    await readBlobAsPromise(blob), expected,
+    'CR/LF in adjacent strings should be converted to two platform newlines');
+}, `CR/LF in adjacent input strings`);
+
+</script>
diff --git a/test/wpt/tests/FileAPI/blob/Blob-constructor.any.js b/test/wpt/tests/FileAPI/blob/Blob-constructor.any.js
new file mode 100644
index 00000000000..d16f760caee
--- /dev/null
+++ b/test/wpt/tests/FileAPI/blob/Blob-constructor.any.js
@@ -0,0 +1,468 @@
+// META: title=Blob constructor
+// META: script=../support/Blob.js
+'use strict';
+
+test(function() {
+  assert_true("Blob" in globalThis, "globalThis should have a Blob property.");
+  assert_equals(Blob.length, 0, "Blob.length should be 0.");
+  assert_true(Blob instanceof Function, "Blob should be a function.");
+}, "Blob interface object");
+
+// Step 1.
+test(function() {
+  var blob = new Blob();
+  assert_true(blob instanceof Blob);
+  assert_equals(String(blob), '[object Blob]');
+  assert_equals(blob.size, 0);
+  assert_equals(blob.type, "");
+}, "Blob constructor with no arguments");
+test(function() {
+  assert_throws_js(TypeError, function() { var blob = Blob(); });
+}, "Blob constructor with no arguments, without 'new'");
+test(function() {
+  var blob = new Blob;
+  assert_true(blob instanceof Blob);
+  assert_equals(blob.size, 0);
+  assert_equals(blob.type, "");
+}, "Blob constructor without brackets");
+test(function() {
+  var blob = new Blob(undefined);
+  assert_true(blob instanceof Blob);
+  assert_equals(String(blob), '[object Blob]');
+  assert_equals(blob.size, 0);
+  assert_equals(blob.type, "");
+}, "Blob constructor with undefined as first argument");
+
+// blobParts argument (WebIDL).
+test(function() {
+  var args = [
+    null,
+    true,
+    false,
+    0,
+    1,
+    1.5,
+    "FAIL",
+    new Date(),
+    new RegExp(),
+    {},
+    { 0: "FAIL", length: 1 },
+  ];
+  args.forEach(function(arg) {
+    assert_throws_js(TypeError, function() {
+      new Blob(arg);
+    }, "Should throw for argument " + format_value(arg) + ".");
+  });
+}, "Passing non-objects, Dates and RegExps for blobParts should throw a TypeError.");
+
+test_blob(function() {
+  return new Blob({
+    [Symbol.iterator]: Array.prototype[Symbol.iterator],
+  });
+}, {
+  expected: "",
+  type: "",
+  desc: "A plain object with @@iterator should be treated as a sequence for the blobParts argument."
+});
+test(t => {
+  const blob = new Blob({
+    [Symbol.iterator]() {
+      var i = 0;
+      return {next: () => [
+        {done:false, value:'ab'},
+        {done:false, value:'cde'},
+        {done:true}
+      ][i++]
+      };
+    }
+  });
+  assert_equals(blob.size, 5, 'Custom @@iterator should be treated as a sequence');
+}, "A plain object with custom @@iterator should be treated as a sequence for the blobParts argument.");
+test_blob(function() {
+  return new Blob({
+    [Symbol.iterator]: Array.prototype[Symbol.iterator],
+    0: "PASS",
+    length: 1
+  });
+}, {
+  expected: "PASS",
+  type: "",
+  desc: "A plain object with @@iterator and a length property should be treated as a sequence for the blobParts argument."
+});
+test_blob(function() {
+  return new Blob(new String("xyz"));
+}, {
+  expected: "xyz",
+  type: "",
+  desc: "A String object should be treated as a sequence for the blobParts argument."
+});
+test_blob(function() {
+  return new Blob(new Uint8Array([1, 2, 3]));
+}, {
+  expected: "123",
+  type: "",
+  desc: "A Uint8Array object should be treated as a sequence for the blobParts argument."
+});
+
+var test_error = {
+  name: "test",
+  message: "test error",
+};
+
+test(function() {
+  var obj = {
+    [Symbol.iterator]: Array.prototype[Symbol.iterator],
+    get length() { throw test_error; }
+  };
+  assert_throws_exactly(test_error, function() {
+    new Blob(obj);
+  });
+}, "The length getter should be invoked and any exceptions should be propagated.");
+
+test(function() {
+  assert_throws_exactly(test_error, function() {
+    var obj = {
+      [Symbol.iterator]: Array.prototype[Symbol.iterator],
+      length: {
+        valueOf: null,
+        toString: function() { throw test_error; }
+      }
+    };
+    new Blob(obj);
+  });
+  assert_throws_exactly(test_error, function() {
+    var obj = {
+      [Symbol.iterator]: Array.prototype[Symbol.iterator],
+      length: { valueOf: function() { throw test_error; } }
+    };
+    new Blob(obj);
+  });
+}, "ToUint32 should be applied to the length and any exceptions should be propagated.");
+
+test(function() {
+  var received = [];
+  var obj = {
+    get [Symbol.iterator]() {
+      received.push("Symbol.iterator");
+      return Array.prototype[Symbol.iterator];
+    },
+    get length() {
+      received.push("length getter");
+      return {
+        valueOf: function() {
+          received.push("length valueOf");
+          return 3;
+        }
+      };
+    },
+    get 0() {
+      received.push("0 getter");
+      return {
+        toString: function() {
+          received.push("0 toString");
+          return "a";
+        }
+      };
+    },
+    get 1() {
+      received.push("1 getter");
+      throw test_error;
+    },
+    get 2() {
+      received.push("2 getter");
+      assert_unreached("Should not call the getter for 2 if the getter for 1 threw.");
+    }
+  };
+  assert_throws_exactly(test_error, function() {
+    new Blob(obj);
+  });
+  assert_array_equals(received, [
+    "Symbol.iterator",
+    "length getter",
+    "length valueOf",
+    "0 getter",
+    "0 toString",
+    "length getter",
+    "length valueOf",
+    "1 getter",
+  ]);
+}, "Getters and value conversions should happen in order until an exception is thrown.");
+
+// XXX should add tests edge cases of ToLength(length)
+
+test(function() {
+  assert_throws_exactly(test_error, function() {
+    new Blob([{ toString: function() { throw test_error; } }]);
+  }, "Throwing toString");
+  assert_throws_exactly(test_error, function() {
+    new Blob([{ toString: undefined, valueOf: function() { throw test_error; } }]);
+  }, "Throwing valueOf");
+  assert_throws_exactly(test_error, function() {
+    new Blob([{
+      toString: function() { throw test_error; },
+      valueOf: function() { assert_unreached("Should not call valueOf if toString is present."); }
+    }]);
+  }, "Throwing toString and valueOf");
+  assert_throws_js(TypeError, function() {
+    new Blob([{toString: null, valueOf: null}]);
+  }, "Null toString and valueOf");
+}, "ToString should be called on elements of the blobParts array and any exceptions should be propagated.");
+
+test_blob(function() {
+  var arr = [
+    { toString: function() { arr.pop(); return "PASS"; } },
+    { toString: function() { assert_unreached("Should have removed the second element of the array rather than called toString() on it."); } }
+  ];
+  return new Blob(arr);
+}, {
+  expected: "PASS",
+  type: "",
+  desc: "Changes to the blobParts array should be reflected in the returned Blob (pop)."
+});
+
+test_blob(function() {
+  var arr = [
+    {
+      toString: function() {
+        if (arr.length === 3) {
+          return "A";
+        }
+        arr.unshift({
+          toString: function() {
+            assert_unreached("Should only access index 0 once.");
+          }
+        });
+        return "P";
+      }
+    },
+    {
+      toString: function() {
+        return "SS";
+      }
+    }
+  ];
+  return new Blob(arr);
+}, {
+  expected: "PASS",
+  type: "",
+  desc: "Changes to the blobParts array should be reflected in the returned Blob (unshift)."
+});
+
+test_blob(function() {
+  // https://www.w3.org/Bugs/Public/show_bug.cgi?id=17652
+  return new Blob([
+    null,
+    undefined,
+    true,
+    false,
+    0,
+    1,
+    new String("stringobject"),
+    [],
+    ['x', 'y'],
+    {},
+    { 0: "FAIL", length: 1 },
+    { toString: function() { return "stringA"; } },
+    { toString: undefined, valueOf: function() { return "stringB"; } },
+    { valueOf: function() { assert_unreached("Should not call valueOf if toString is present on the prototype."); } }
+  ]);
+}, {
+  expected: "nullundefinedtruefalse01stringobjectx,y[object Object][object Object]stringAstringB[object Object]",
+  type: "",
+  desc: "ToString should be called on elements of the blobParts array."
+});
+
+test_blob(function() {
+  return new Blob([
+    new ArrayBuffer(8)
+  ]);
+}, {
+  expected: "\0\0\0\0\0\0\0\0",
+  type: "",
+  desc: "ArrayBuffer elements of the blobParts array should be supported."
+});
+
+test_blob(function() {
+  return new Blob([
+    new Uint8Array([0x50, 0x41, 0x53, 0x53]),
+    new Int8Array([0x50, 0x41, 0x53, 0x53]),
+    new Uint16Array([0x4150, 0x5353]),
+    new Int16Array([0x4150, 0x5353]),
+    new Uint32Array([0x53534150]),
+    new Int32Array([0x53534150]),
+    new Float32Array([0xD341500000])
+  ]);
+}, {
+  expected: "PASSPASSPASSPASSPASSPASSPASS",
+  type: "",
+  desc: "Passing typed arrays as elements of the blobParts array should work."
+});
+test_blob(function() {
+  return new Blob([
+    // 0x535 3415053534150
+    // 0x535 = 0b010100110101 -> Sign = +, Exponent = 1333 - 1023 = 310
+    // 0x13415053534150 * 2**(-52)
+    // ==> 0x13415053534150 * 2**258 = 2510297372767036725005267563121821874921913208671273727396467555337665343087229079989707079680
+    new Float64Array([2510297372767036725005267563121821874921913208671273727396467555337665343087229079989707079680])
+  ]);
+}, {
+  expected: "PASSPASS",
+  type: "",
+  desc: "Passing a Float64Array as element of the blobParts array should work."
+});
+
+test_blob(function() {
+  return new Blob([
+    new BigInt64Array([BigInt("0x5353415053534150")]),
+    new BigUint64Array([BigInt("0x5353415053534150")])
+  ]);
+}, {
+  expected: "PASSPASSPASSPASS",
+  type: "",
+  desc: "Passing BigInt typed arrays as elements of the blobParts array should work."
+});
+
+var t_ports = async_test("Passing a FrozenArray as the blobParts array should work (FrozenArray<MessagePort>).");
+t_ports.step(function() {
+    var channel = new MessageChannel();
+    channel.port2.onmessage = this.step_func(function(e) {
+        var b_ports = new Blob(e.ports);
+        assert_equals(b_ports.size, "[object MessagePort]".length);
+        this.done();
+    });
+    var channel2 = new MessageChannel();
+    channel.port1.postMessage('', [channel2.port1]);
+});
+
+test_blob(function() {
+  var blob = new Blob(['foo']);
+  return new Blob([blob, blob]);
+}, {
+  expected: "foofoo",
+  type: "",
+  desc: "Array with two blobs"
+});
+
+test_blob_binary(function() {
+  var view = new Uint8Array([0, 255, 0]);
+  return new Blob([view.buffer, view.buffer]);
+}, {
+  expected: [0, 255, 0, 0, 255, 0],
+  type: "",
+  desc: "Array with two buffers"
+});
+
+test_blob_binary(function() {
+  var view = new Uint8Array([0, 255, 0, 4]);
+  var blob = new Blob([view, view]);
+  assert_equals(blob.size, 8);
+  var view1 = new Uint16Array(view.buffer, 2);
+  return new Blob([view1, view.buffer, view1]);
+}, {
+  expected: [0, 4, 0, 255, 0, 4, 0, 4],
+  type: "",
+  desc: "Array with two bufferviews"
+});
+
+test_blob(function() {
+  var view = new Uint8Array([0]);
+  var blob = new Blob(["fo"]);
+  return new Blob([view.buffer, blob, "foo"]);
+}, {
+  expected: "\0fofoo",
+  type: "",
+  desc: "Array with mixed types"
+});
+
+test(function() {
+  const accessed = [];
+  const stringified = [];
+
+  new Blob([], {
+    get type() { accessed.push('type'); },
+    get endings() { accessed.push('endings'); }
+  });
+  new Blob([], {
+    type: { toString: () => { stringified.push('type'); return ''; } },
+    endings: { toString: () => { stringified.push('endings'); return 'transparent'; } }
+  });
+  assert_array_equals(accessed, ['endings', 'type']);
+  assert_array_equals(stringified, ['endings', 'type']);
+}, "options properties should be accessed in lexicographic order.");
+
+test(function() {
+  assert_throws_exactly(test_error, function() {
+    new Blob(
+      [{ toString: function() { throw test_error } }],
+      {
+        get type() { assert_unreached("type getter should not be called."); }
+      }
+    );
+  });
+}, "Arguments should be evaluated from left to right.");
+
+[
+  null,
+  undefined,
+  {},
+  { unrecognized: true },
+  /regex/,
+  function() {}
+].forEach(function(arg, idx) {
+  test_blob(function() {
+    return new Blob([], arg);
+  }, {
+    expected: "",
+    type: "",
+    desc: "Passing " + format_value(arg) + " (index " + idx + ") for options should use the defaults."
+  });
+  test_blob(function() {
+    return new Blob(["\na\r\nb\n\rc\r"], arg);
+  }, {
+    expected: "\na\r\nb\n\rc\r",
+    type: "",
+    desc: "Passing " + format_value(arg) + " (index " + idx + ") for options should use the defaults (with newlines)."
+  });
+});
+
+[
+  123,
+  123.4,
+  true,
+  'abc'
+].forEach(arg => {
+  test(t => {
+    assert_throws_js(TypeError, () => new Blob([], arg),
+                     'Blob constructor should throw with invalid property bag');
+  }, `Passing ${JSON.stringify(arg)} for options should throw`);
+});
+
+var type_tests = [
+  // blobParts, type, expected type
+  [[], '', ''],
+  [[], 'a', 'a'],
+  [[], 'A', 'a'],
+  [[], 'text/html', 'text/html'],
+  [[], 'TEXT/HTML', 'text/html'],
+  [[], 'text/plain;charset=utf-8', 'text/plain;charset=utf-8'],
+  [[], '\u00E5', ''],
+  [[], '\uD801\uDC7E', ''], // U+1047E
+  [[], ' image/gif ', ' image/gif '],
+  [[], '\timage/gif\t', ''],
+  [[], 'image/gif;\u007f', ''],
+  [[], '\u0130mage/gif', ''], // uppercase i with dot
+  [[], '\u0131mage/gif', ''], // lowercase dotless i
+  [[], 'image/gif\u0000', ''],
+  // check that type isn't changed based on sniffing
+  [[0x3C, 0x48, 0x54, 0x4D, 0x4C, 0x3E], 'unknown/unknown', 'unknown/unknown'], // "<HTML>"
+  [[0x00, 0xFF], 'text/plain', 'text/plain'],
+  [[0x47, 0x49, 0x46, 0x38, 0x39, 0x61], 'image/png', 'image/png'], // "GIF89a"
+];
+
+type_tests.forEach(function(t) {
+  test(function() {
+    var arr = new Uint8Array([t[0]]).buffer;
+    var b = new Blob([arr], {type:t[1]});
+    assert_equals(b.type, t[2]);
+  }, "Blob with type " + format_value(t[1]));
+});
diff --git a/test/wpt/tests/FileAPI/blob/Blob-in-worker.worker.js b/test/wpt/tests/FileAPI/blob/Blob-in-worker.worker.js
new file mode 100644
index 00000000000..a0ca84551dd
--- /dev/null
+++ b/test/wpt/tests/FileAPI/blob/Blob-in-worker.worker.js
@@ -0,0 +1,9 @@
+importScripts("/resources/testharness.js");
+
+promise_test(async () => {
+  const data = "TEST";
+  const blob = new Blob([data], {type: "text/plain"});
+  assert_equals(await blob.text(), data);
+}, 'Create Blob in Worker');
+
+done();
diff --git a/test/wpt/tests/FileAPI/blob/Blob-slice-overflow.any.js b/test/wpt/tests/FileAPI/blob/Blob-slice-overflow.any.js
new file mode 100644
index 00000000000..388fd9282c9
--- /dev/null
+++ b/test/wpt/tests/FileAPI/blob/Blob-slice-overflow.any.js
@@ -0,0 +1,32 @@
+// META: title=Blob slice overflow
+'use strict';
+
+var text = '';
+
+for (var i = 0; i < 2000; ++i) {
+  text += 'A';
+}
+
+test(function() {
+  var blob = new Blob([text]);
+  var sliceBlob = blob.slice(-1, blob.size);
+  assert_equals(sliceBlob.size, 1, "Blob slice size");
+}, "slice start is negative, relativeStart will be max((size + start), 0)");
+
+test(function() {
+  var blob = new Blob([text]);
+  var sliceBlob = blob.slice(blob.size + 1, blob.size);
+  assert_equals(sliceBlob.size, 0, "Blob slice size");
+}, "slice start is greater than blob size, relativeStart will be min(start, size)");
+
+test(function() {
+  var blob = new Blob([text]);
+  var sliceBlob = blob.slice(blob.size - 2, -1);
+  assert_equals(sliceBlob.size, 1, "Blob slice size");
+}, "slice end is negative, relativeEnd will be max((size + end), 0)");
+
+test(function() {
+  var blob = new Blob([text]);
+  var sliceBlob = blob.slice(blob.size - 2, blob.size + 999);
+  assert_equals(sliceBlob.size, 2, "Blob slice size");
+}, "slice end is greater than blob size, relativeEnd will be min(end, size)");
diff --git a/test/wpt/tests/FileAPI/blob/Blob-slice.any.js b/test/wpt/tests/FileAPI/blob/Blob-slice.any.js
new file mode 100644
index 00000000000..1f85d44d269
--- /dev/null
+++ b/test/wpt/tests/FileAPI/blob/Blob-slice.any.js
@@ -0,0 +1,231 @@
+// META: title=Blob slice
+// META: script=../support/Blob.js
+'use strict';
+
+test_blob(function() {
+  var blobTemp = new Blob(["PASS"]);
+  return blobTemp.slice();
+}, {
+  expected: "PASS",
+  type: "",
+  desc: "no-argument Blob slice"
+});
+
+test(function() {
+  var blob1, blob2;
+
+  test_blob(function() {
+    return blob1 = new Blob(["squiggle"]);
+  }, {
+    expected: "squiggle",
+    type: "",
+    desc: "blob1."
+  });
+
+  test_blob(function() {
+    return blob2 = new Blob(["steak"], {type: "content/type"});
+  }, {
+    expected: "steak",
+    type: "content/type",
+    desc: "blob2."
+  });
+
+  test_blob(function() {
+    return new Blob().slice(0,0,null);
+  }, {
+    expected: "",
+    type: "null",
+    desc: "null type Blob slice"
+  });
+
+  test_blob(function() {
+    return new Blob().slice(0,0,undefined);
+  }, {
+    expected: "",
+    type: "",
+    desc: "undefined type Blob slice"
+  });
+
+  test_blob(function() {
+    return new Blob().slice(0,0);
+  }, {
+    expected: "",
+    type: "",
+    desc: "no type Blob slice"
+  });
+
+  var arrayBuffer = new ArrayBuffer(16);
+  var int8View = new Int8Array(arrayBuffer);
+  for (var i = 0; i < 16; i++) {
+    int8View[i] = i + 65;
+  }
+
+  var testData = [
+    [
+      ["PASSSTRING"],
+      [{start:  -6, contents: "STRING"},
+       {start: -12, contents: "PASSSTRING"},
+       {start:   4, contents: "STRING"},
+       {start:  12, contents: ""},
+       {start: 0, end:  -6, contents: "PASS"},
+       {start: 0, end: -12, contents: ""},
+       {start: 0, end:   4, contents: "PASS"},
+       {start: 0, end:  12, contents: "PASSSTRING"},
+       {start: 7, end:   4, contents: ""}]
+    ],
+
+    // Test 3 strings
+    [
+      ["foo", "bar", "baz"],
+      [{start:  0, end:  9, contents: "foobarbaz"},
+       {start:  0, end:  3, contents: "foo"},
+       {start:  3, end:  9, contents: "barbaz"},
+       {start:  6, end:  9, contents: "baz"},
+       {start:  6, end: 12, contents: "baz"},
+       {start:  0, end:  9, contents: "foobarbaz"},
+       {start:  0, end: 11, contents: "foobarbaz"},
+       {start: 10, end: 15, contents: ""}]
+    ],
+
+    // Test string, Blob, string
+    [
+      ["foo", blob1, "baz"],
+      [{start:  0, end:  3, contents: "foo"},
+       {start:  3, end: 11, contents: "squiggle"},
+       {start:  2, end:  4, contents: "os"},
+       {start: 10, end: 12, contents: "eb"}]
+    ],
+
+    // Test blob, string, blob
+    [
+      [blob1, "foo", blob1],
+      [{start:  0, end:  8, contents: "squiggle"},
+       {start:  7, end:  9, contents: "ef"},
+       {start: 10, end: 12, contents: "os"},
+       {start:  1, end:  4, contents: "qui"},
+       {start: 12, end: 15, contents: "qui"},
+       {start: 40, end: 60, contents: ""}]
+    ],
+
+    // Test blobs all the way down
+    [
+      [blob2, blob1, blob2],
+      [{start: 0,  end:  5, contents: "steak"},
+       {start: 5,  end: 13, contents: "squiggle"},
+       {start: 13, end: 18, contents: "steak"},
+       {start:  1, end:  3, contents: "te"},
+       {start:  6, end: 10, contents: "quig"}]
+    ],
+
+    // Test an ArrayBufferView
+    [
+      [int8View, blob1, "foo"],
+      [{start:  0, end:  8, contents: "ABCDEFGH"},
+       {start:  8, end: 18, contents: "IJKLMNOPsq"},
+       {start: 17, end: 20, contents: "qui"},
+       {start:  4, end: 12, contents: "EFGHIJKL"}]
+    ],
+
+    // Test a partial ArrayBufferView
+    [
+      [new Uint8Array(arrayBuffer, 3, 5), blob1, "foo"],
+      [{start:  0, end:  8, contents: "DEFGHsqu"},
+       {start:  8, end: 18, contents: "igglefoo"},
+       {start:  4, end: 12, contents: "Hsquiggl"}]
+    ],
+
+    // Test type coercion of a number
+    [
+      [3, int8View, "foo"],
+      [{start:  0, end:  8, contents: "3ABCDEFG"},
+       {start:  8, end: 18, contents: "HIJKLMNOPf"},
+       {start: 17, end: 21, contents: "foo"},
+       {start:  4, end: 12, contents: "DEFGHIJK"}]
+    ],
+
+    [
+      [(new Uint8Array([0, 255, 0])).buffer,
+       new Blob(['abcd']),
+       'efgh',
+       'ijklmnopqrstuvwxyz'],
+      [{start:  1, end:  4, contents: "\uFFFD\u0000a"},
+       {start:  4, end:  8, contents: "bcde"},
+       {start:  8, end: 12, contents: "fghi"},
+       {start:  1, end: 12, contents: "\uFFFD\u0000abcdefghi"}]
+    ]
+  ];
+
+  testData.forEach(function(data, i) {
+    var blobs = data[0];
+    var tests = data[1];
+    tests.forEach(function(expectations, j) {
+      test(function() {
+        var blob = new Blob(blobs);
+        assert_true(blob instanceof Blob);
+        assert_false(blob instanceof File);
+
+        test_blob(function() {
+          return expectations.end === undefined
+                 ? blob.slice(expectations.start)
+                 : blob.slice(expectations.start, expectations.end);
+        }, {
+          expected: expectations.contents,
+          type: "",
+          desc: "Slicing test: slice (" + i + "," + j + ")."
+        });
+      }, "Slicing test (" + i + "," + j + ").");
+    });
+  });
+}, "Slices");
+
+var invalidTypes = [
+  "\xFF",
+  "te\x09xt/plain",
+  "te\x00xt/plain",
+  "te\x1Fxt/plain",
+  "te\x7Fxt/plain"
+];
+invalidTypes.forEach(function(type) {
+  test_blob(function() {
+    var blob = new Blob(["PASS"]);
+    return blob.slice(0, 4, type);
+  }, {
+    expected: "PASS",
+    type: "",
+    desc: "Invalid contentType (" + format_value(type) + ")"
+  });
+});
+
+var validTypes = [
+  "te(xt/plain",
+  "te)xt/plain",
+  "te<xt/plain",
+  "te>xt/plain",
+  "te@xt/plain",
+  "te,xt/plain",
+  "te;xt/plain",
+  "te:xt/plain",
+  "te\\xt/plain",
+  "te\"xt/plain",
+  "te/xt/plain",
+  "te[xt/plain",
+  "te]xt/plain",
+  "te?xt/plain",
+  "te=xt/plain",
+  "te{xt/plain",
+  "te}xt/plain",
+  "te\x20xt/plain",
+  "TEXT/PLAIN",
+  "text/plain;charset = UTF-8",
+  "text/plain;charset=UTF-8"
+];
+validTypes.forEach(function(type) {
+  test_blob(function() {
+    var blob = new Blob(["PASS"]);
+    return blob.slice(0, 4, type);
+  }, {
+    expected: "PASS",
+    type: type.toLowerCase(),
+    desc: "Valid contentType (" + format_value(type) + ")"
+  });
+});
diff --git a/test/wpt/tests/FileAPI/blob/Blob-stream-byob-crash.html b/test/wpt/tests/FileAPI/blob/Blob-stream-byob-crash.html
new file mode 100644
index 00000000000..5992ed1396c
--- /dev/null
+++ b/test/wpt/tests/FileAPI/blob/Blob-stream-byob-crash.html
@@ -0,0 +1,11 @@
+<!DOCTYPE html>
+<script type="module">
+  let a = new Blob(['', '', undefined], { })
+  let b = a.stream()
+  let c = new ReadableStreamBYOBReader(b)
+  let d = new Int16Array(8)
+  await c.read(d)
+  c.releaseLock()
+  await a.text()
+  await b.cancel()
+</script>
diff --git a/test/wpt/tests/FileAPI/blob/Blob-stream-sync-xhr-crash.html b/test/wpt/tests/FileAPI/blob/Blob-stream-sync-xhr-crash.html
new file mode 100644
index 00000000000..fe54fb615b1
--- /dev/null
+++ b/test/wpt/tests/FileAPI/blob/Blob-stream-sync-xhr-crash.html
@@ -0,0 +1,13 @@
+<!DOCTYPE html>
+<script>
+  const blob = new Blob([1, 2]);
+  const readable = blob.stream()
+  const writable = new WritableStream({}, {
+    size() {
+      let xhr = new XMLHttpRequest()
+      xhr.open("POST", "1", false)
+      xhr.send()
+    }
+  })
+  readable.pipeThrough({ readable, writable })
+</script>
diff --git a/test/wpt/tests/FileAPI/blob/Blob-stream.any.js b/test/wpt/tests/FileAPI/blob/Blob-stream.any.js
new file mode 100644
index 00000000000..87710a171a9
--- /dev/null
+++ b/test/wpt/tests/FileAPI/blob/Blob-stream.any.js
@@ -0,0 +1,83 @@
+// META: title=Blob Stream
+// META: script=../support/Blob.js
+// META: script=/common/gc.js
+'use strict';
+
+// Helper function that triggers garbage collection while reading a chunk
+// if perform_gc is true.
+async function read_and_gc(reader, perform_gc) {
+  // Passing Uint8Array for byte streams; non-byte streams will simply ignore it
+  const read_promise = reader.read(new Uint8Array(64));
+  if (perform_gc) {
+    await garbageCollect();
+  }
+  return read_promise;
+}
+
+// Takes in a ReadableStream and reads from it until it is done, returning
+// an array that contains the results of each read operation. If perform_gc
+// is true, garbage collection is triggered while reading every chunk.
+async function read_all_chunks(stream, { perform_gc = false, mode } = {}) {
+  assert_true(stream instanceof ReadableStream);
+  assert_true('getReader' in stream);
+  const reader = stream.getReader({ mode });
+
+  assert_true('read' in reader);
+  let read_value = await read_and_gc(reader, perform_gc);
+
+  let out = [];
+  let i = 0;
+  while (!read_value.done) {
+    for (let val of read_value.value) {
+      out[i++] = val;
+    }
+    read_value = await read_and_gc(reader, perform_gc);
+  }
+  return out;
+}
+
+promise_test(async () => {
+  const blob = new Blob(["PASS"]);
+  const stream = blob.stream();
+  const chunks = await read_all_chunks(stream);
+  for (let [index, value] of chunks.entries()) {
+    assert_equals(value, "PASS".charCodeAt(index));
+  }
+}, "Blob.stream()")
+
+promise_test(async () => {
+  const blob = new Blob();
+  const stream = blob.stream();
+  const chunks = await read_all_chunks(stream);
+  assert_array_equals(chunks, []);
+}, "Blob.stream() empty Blob")
+
+promise_test(async () => {
+  const input_arr = [8, 241, 48, 123, 151];
+  const typed_arr = new Uint8Array(input_arr);
+  const blob = new Blob([typed_arr]);
+  const stream = blob.stream();
+  const chunks = await read_all_chunks(stream);
+  assert_array_equals(chunks, input_arr);
+}, "Blob.stream() non-unicode input")
+
+promise_test(async() => {
+  const input_arr = [8, 241, 48, 123, 151];
+  const typed_arr = new Uint8Array(input_arr);
+  let blob = new Blob([typed_arr]);
+  const stream = blob.stream();
+  blob = null;
+  await garbageCollect();
+  const chunks = await read_all_chunks(stream, { perform_gc: true });
+  assert_array_equals(chunks, input_arr);
+}, "Blob.stream() garbage collection of blob shouldn't break stream" +
+      "consumption")
+
+promise_test(async () => {
+  const input_arr = [8, 241, 48, 123, 151];
+  const typed_arr = new Uint8Array(input_arr);
+  let blob = new Blob([typed_arr]);
+  const stream = blob.stream();
+  const chunks = await read_all_chunks(stream, { mode: "byob" });
+  assert_array_equals(chunks, input_arr);
+}, "Reading Blob.stream() with BYOB reader")
diff --git a/test/wpt/tests/FileAPI/blob/Blob-text.any.js b/test/wpt/tests/FileAPI/blob/Blob-text.any.js
new file mode 100644
index 00000000000..d04fa97cffe
--- /dev/null
+++ b/test/wpt/tests/FileAPI/blob/Blob-text.any.js
@@ -0,0 +1,64 @@
+// META: title=Blob Text
+// META: script=../support/Blob.js
+'use strict';
+
+promise_test(async () => {
+  const blob = new Blob(["PASS"]);
+  const text = await blob.text();
+  assert_equals(text, "PASS");
+}, "Blob.text()")
+
+promise_test(async () => {
+  const blob = new Blob();
+  const text = await blob.text();
+  assert_equals(text, "");
+}, "Blob.text() empty blob data")
+
+promise_test(async () => {
+  const blob = new Blob(["P", "A", "SS"]);
+  const text = await blob.text();
+  assert_equals(text, "PASS");
+}, "Blob.text() multi-element array in constructor")
+
+promise_test(async () => {
+  const non_unicode = "\u0061\u030A";
+  const input_arr = new TextEncoder().encode(non_unicode);
+  const blob = new Blob([input_arr]);
+  const text = await blob.text();
+  assert_equals(text, non_unicode);
+}, "Blob.text() non-unicode")
+
+promise_test(async () => {
+  const blob = new Blob(["PASS"], { type: "text/plain;charset=utf-16le" });
+  const text = await blob.text();
+  assert_equals(text, "PASS");
+}, "Blob.text() different charset param in type option")
+
+promise_test(async () => {
+  const non_unicode = "\u0061\u030A";
+  const input_arr = new TextEncoder().encode(non_unicode);
+  const blob = new Blob([input_arr], { type: "text/plain;charset=utf-16le" });
+  const text = await blob.text();
+  assert_equals(text, non_unicode);
+}, "Blob.text() different charset param with non-ascii input")
+
+promise_test(async () => {
+  const input_arr = new Uint8Array([192, 193, 245, 246, 247, 248, 249, 250, 251,
+      252, 253, 254, 255]);
+  const blob = new Blob([input_arr]);
+  const text = await blob.text();
+  assert_equals(text, "\ufffd\ufffd\ufffd\ufffd\ufffd\ufffd\ufffd\ufffd\ufffd" +
+      "\ufffd\ufffd\ufffd\ufffd");
+}, "Blob.text() invalid utf-8 input")
+
+promise_test(async () => {
+  const input_arr = new Uint8Array([192, 193, 245, 246, 247, 248, 249, 250, 251,
+      252, 253, 254, 255]);
+  const blob = new Blob([input_arr]);
+  const text_results = await Promise.all([blob.text(), blob.text(),
+      blob.text()]);
+  for (let text of text_results) {
+    assert_equals(text, "\ufffd\ufffd\ufffd\ufffd\ufffd\ufffd\ufffd\ufffd\ufffd" +
+        "\ufffd\ufffd\ufffd\ufffd");
+  }
+}, "Blob.text() concurrent reads")
diff --git a/test/wpt/tests/FileAPI/file/File-constructor-endings.html b/test/wpt/tests/FileAPI/file/File-constructor-endings.html
new file mode 100644
index 00000000000..1282b6c5ac2
--- /dev/null
+++ b/test/wpt/tests/FileAPI/file/File-constructor-endings.html
@@ -0,0 +1,104 @@
+<!DOCTYPE html>
+<meta charset=utf-8>
+<title>File constructor: endings option</title>
+<link rel=help href="https://w3c.github.io/FileAPI/#file-constructor">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script>
+
+// Windows platforms use CRLF as the native line ending. All others use LF.
+const crlf = navigator.platform.startsWith('Win');
+const native_ending = crlf ? '\r\n' : '\n';
+
+function readBlobAsPromise(blob) {
+  return new Promise((resolve, reject) => {
+    const reader = new FileReader();
+    reader.readAsText(blob);
+    reader.onload = e => resolve(reader.result);
+    reader.onerror = e => reject(reader.error);
+  });
+}
+
+[
+  'transparent',
+  'native'
+].forEach(value => test(t => {
+  assert_class_string(new File([], "name", {endings: value}), 'File',
+                      `Constructor should allow "${value}" endings`);
+}, `Valid "endings" value: ${JSON.stringify(value)}`));
+
+[
+  null,
+  '',
+  'invalidEnumValue',
+  'Transparent',
+  'NATIVE',
+  0,
+  {}
+].forEach(value => test(t => {
+  assert_throws_js(TypeError, () => new File([], "name", {endings: value}),
+                   'File constructor should throw');
+}, `Invalid "endings" value: ${JSON.stringify(value)}`));
+
+test(t => {
+  const test_error = {name: 'test'};
+  assert_throws_exactly(
+    test_error,
+    () => new File([], "name", { get endings() { throw test_error; }}),
+    'File constructor should propagate exceptions from "endings" property');
+}, 'Exception propagation from options');
+
+test(t => {
+  let got = false;
+  new File([], "name", { get endings() { got = true; } });
+  assert_true(got, 'The "endings" property was accessed during construction.');
+}, 'The "endings" options property is used');
+
+[
+  {name: 'LF', input: '\n', native: native_ending},
+  {name: 'CR', input: '\r', native: native_ending},
+
+  {name: 'CRLF', input: '\r\n', native: native_ending},
+  {name: 'CRCR', input: '\r\r', native: native_ending.repeat(2)},
+  {name: 'LFCR', input: '\n\r', native: native_ending.repeat(2)},
+  {name: 'LFLF', input: '\n\n', native: native_ending.repeat(2)},
+
+  {name: 'CRCRLF', input: '\r\r\n', native: native_ending.repeat(2)},
+  {name: 'CRLFLF', input: '\r\n\n', native: native_ending.repeat(2)},
+  {name: 'CRLFCR', input: '\r\n\r\n', native: native_ending.repeat(2)},
+
+  {name: 'CRLFCRLF', input: '\r\n\r\n', native: native_ending.repeat(2)},
+  {name: 'LFCRLFCR', input: '\n\r\n\r', native: native_ending.repeat(3)},
+
+].forEach(testCase => {
+  promise_test(async t => {
+    const file = new File([testCase.input], "name");
+    assert_equals(
+      await readBlobAsPromise(file), testCase.input,
+      'Newlines should not change with endings unspecified');
+  }, `Input ${testCase.name} with endings unspecified`);
+
+  promise_test(async t => {
+    const file = new File([testCase.input], "name", {endings: 'transparent'});
+    assert_equals(
+      await readBlobAsPromise(file), testCase.input,
+      'Newlines should not change with endings "transparent"');
+  }, `Input ${testCase.name} with endings 'transparent'`);
+
+  promise_test(async t => {
+    const file = new File([testCase.input], "name", {endings: 'native'});
+    assert_equals(
+      await readBlobAsPromise(file), testCase.native,
+      'Newlines should match the platform with endings "native"');
+  }, `Input ${testCase.name} with endings 'native'`);
+});
+
+promise_test(async t => {
+  const file = new File(['\r', '\n'], "name", {endings: 'native'});
+  const expected = native_ending.repeat(2);
+  assert_equals(
+    await readBlobAsPromise(file), expected,
+    'CR/LF in adjacent strings should be converted to two platform newlines');
+}, `CR/LF in adjacent input strings`);
+
+</script>
diff --git a/test/wpt/tests/FileAPI/file/Worker-read-file-constructor.worker.js b/test/wpt/tests/FileAPI/file/Worker-read-file-constructor.worker.js
new file mode 100644
index 00000000000..4e003b3c958
--- /dev/null
+++ b/test/wpt/tests/FileAPI/file/Worker-read-file-constructor.worker.js
@@ -0,0 +1,15 @@
+importScripts("/resources/testharness.js");
+
+async_test(function() {
+  var file = new File(["bits"], "dummy", { 'type': 'text/plain', lastModified: 42 });
+  var reader = new FileReader();
+  reader.onload = this.step_func_done(function() {
+    assert_equals(file.name, "dummy", "file name");
+    assert_equals(reader.result, "bits", "file content");
+    assert_equals(file.lastModified, 42, "file lastModified");
+  });
+  reader.onerror = this.unreached_func("Unexpected error event");
+  reader.readAsText(file);
+}, "FileReader in Worker");
+
+done();
diff --git a/test/wpt/tests/FileAPI/file/resources/echo-content-escaped.py b/test/wpt/tests/FileAPI/file/resources/echo-content-escaped.py
new file mode 100644
index 00000000000..5370e1e46ac
--- /dev/null
+++ b/test/wpt/tests/FileAPI/file/resources/echo-content-escaped.py
@@ -0,0 +1,26 @@
+from wptserve.utils import isomorphic_encode
+
+# Outputs the request body, with controls and non-ASCII bytes escaped
+# (b"\n" becomes b"\\x0a"), and with backslashes doubled.
+# As a convenience, CRLF newlines are left as is.
+
+def escape_byte(byte):
+    # Convert int byte into a single-char binary string.
+    byte = bytes([byte])
+    if b"\0" <= byte <= b"\x1F" or byte >= b"\x7F":
+        return b"\\x%02x" % ord(byte)
+    if byte == b"\\":
+        return b"\\\\"
+    return byte
+
+def main(request, response):
+
+    headers = [(b"X-Request-Method", isomorphic_encode(request.method)),
+               (b"X-Request-Content-Length", request.headers.get(b"Content-Length", b"NO")),
+               (b"X-Request-Content-Type", request.headers.get(b"Content-Type", b"NO")),
+               # Avoid any kind of content sniffing on the response.
+               (b"Content-Type", b"text/plain; charset=UTF-8")]
+
+    content = b"".join(map(escape_byte, request.body)).replace(b"\\x0d\\x0a", b"\r\n")
+
+    return headers, content
diff --git a/test/wpt/tests/FileAPI/file/send-file-form-controls.html b/test/wpt/tests/FileAPI/file/send-file-form-controls.html
new file mode 100644
index 00000000000..6347065bcae
--- /dev/null
+++ b/test/wpt/tests/FileAPI/file/send-file-form-controls.html
@@ -0,0 +1,113 @@
+<!DOCTYPE html>
+<meta charset="utf-8" />
+<title>Upload files named using controls</title>
+<link
+  rel="help"
+  href="https://html.spec.whatwg.org/multipage/form-control-infrastructure.html#multipart-form-data"
+/>
+<link
+  rel="help"
+  href="https://html.spec.whatwg.org/multipage/dnd.html#datatransferitemlist"
+/>
+<link rel="help" href="https://w3c.github.io/FileAPI/#file-constructor" />
+<link
+  rel="author"
+  title="Benjamin C. Wiley Sittler"
+  href="mailto:bsittler@chromium.org"
+/>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="../support/send-file-form-helper.js"></script>
+<script>
+  "use strict";
+
+  formPostFileUploadTest({
+    fileNameSource: "ASCII",
+    fileBaseName: "file-for-upload-in-form-NUL-[\0].txt",
+    formEncoding: "UTF-8",
+    expectedEncodedBaseName: "file-for-upload-in-form-NUL-[\0].txt",
+  });
+
+  formPostFileUploadTest({
+    fileNameSource: "ASCII",
+    fileBaseName: "file-for-upload-in-form-BS-[\b].txt",
+    formEncoding: "UTF-8",
+    expectedEncodedBaseName: "file-for-upload-in-form-BS-[\b].txt",
+  });
+
+  formPostFileUploadTest({
+    fileNameSource: "ASCII",
+    fileBaseName: "file-for-upload-in-form-VT-[\v].txt",
+    formEncoding: "UTF-8",
+    expectedEncodedBaseName: "file-for-upload-in-form-VT-[\v].txt",
+  });
+
+  // These have characters that undergo processing in name=,
+  // filename=, and/or value; formPostFileUploadTest postprocesses
+  // expectedEncodedBaseName for these internally.
+
+  formPostFileUploadTest({
+    fileNameSource: "ASCII",
+    fileBaseName: "file-for-upload-in-form-LF-[\n].txt",
+    formEncoding: "UTF-8",
+    expectedEncodedBaseName: "file-for-upload-in-form-LF-[\n].txt",
+  });
+
+  formPostFileUploadTest({
+    fileNameSource: "ASCII",
+    fileBaseName: "file-for-upload-in-form-LF-CR-[\n\r].txt",
+    formEncoding: "UTF-8",
+    expectedEncodedBaseName: "file-for-upload-in-form-LF-CR-[\n\r].txt",
+  });
+
+  formPostFileUploadTest({
+    fileNameSource: "ASCII",
+    fileBaseName: "file-for-upload-in-form-CR-[\r].txt",
+    formEncoding: "UTF-8",
+    expectedEncodedBaseName: "file-for-upload-in-form-CR-[\r].txt",
+  });
+
+  formPostFileUploadTest({
+    fileNameSource: "ASCII",
+    fileBaseName: "file-for-upload-in-form-CR-LF-[\r\n].txt",
+    formEncoding: "UTF-8",
+    expectedEncodedBaseName: "file-for-upload-in-form-CR-LF-[\r\n].txt",
+  });
+
+  formPostFileUploadTest({
+    fileNameSource: "ASCII",
+    fileBaseName: "file-for-upload-in-form-HT-[\t].txt",
+    formEncoding: "UTF-8",
+    expectedEncodedBaseName: "file-for-upload-in-form-HT-[\t].txt",
+  });
+
+  formPostFileUploadTest({
+    fileNameSource: "ASCII",
+    fileBaseName: "file-for-upload-in-form-FF-[\f].txt",
+    formEncoding: "UTF-8",
+    expectedEncodedBaseName: "file-for-upload-in-form-FF-[\f].txt",
+  });
+
+  formPostFileUploadTest({
+    fileNameSource: "ASCII",
+    fileBaseName: "file-for-upload-in-form-DEL-[\x7F].txt",
+    formEncoding: "UTF-8",
+    expectedEncodedBaseName: "file-for-upload-in-form-DEL-[\x7F].txt",
+  });
+
+  // The rest should be passed through unmodified:
+
+  formPostFileUploadTest({
+    fileNameSource: "ASCII",
+    fileBaseName: "file-for-upload-in-form-ESC-[\x1B].txt",
+    formEncoding: "UTF-8",
+    expectedEncodedBaseName: "file-for-upload-in-form-ESC-[\x1B].txt",
+  });
+
+  formPostFileUploadTest({
+    fileNameSource: "ASCII",
+    fileBaseName: "file-for-upload-in-form-SPACE-[ ].txt",
+    formEncoding: "UTF-8",
+    expectedEncodedBaseName: "file-for-upload-in-form-SPACE-[ ].txt",
+  });
+</script>
diff --git a/test/wpt/tests/FileAPI/file/send-file-form-iso-2022-jp.html b/test/wpt/tests/FileAPI/file/send-file-form-iso-2022-jp.html
new file mode 100644
index 00000000000..c931c9be3ab
--- /dev/null
+++ b/test/wpt/tests/FileAPI/file/send-file-form-iso-2022-jp.html
@@ -0,0 +1,65 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<meta name=timeout content=long>
+<title>Upload files in ISO-2022-JP form</title>
+<link rel="help"
+      href="https://html.spec.whatwg.org/multipage/form-control-infrastructure.html#multipart-form-data">
+<link rel="help"
+      href="https://html.spec.whatwg.org/multipage/dnd.html#datatransferitemlist">
+<link rel="help"
+      href="https://w3c.github.io/FileAPI/#file-constructor">
+<link rel="author" title="Benjamin C. Wiley Sittler"
+      href="mailto:bsittler@chromium.org">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="../support/send-file-form-helper.js"></script>
+<script>
+'use strict';
+
+formPostFileUploadTest({
+  fileNameSource: 'ASCII',
+  fileBaseName: 'file-for-upload-in-form.txt',
+  formEncoding: 'ISO-2022-JP',
+  expectedEncodedBaseName: 'file-for-upload-in-form.txt',
+});
+
+formPostFileUploadTest({
+  fileNameSource: 'x-user-defined',
+  fileBaseName: 'file-for-upload-in-form-\uF7F0\uF793\uF783\uF7A0.txt',
+  formEncoding: 'ISO-2022-JP',
+  expectedEncodedBaseName: (
+      'file-for-upload-in-form-&#63472;&#63379;&#63363;&#63392;.txt'),
+});
+
+formPostFileUploadTest({
+  fileNameSource: 'windows-1252',
+  fileBaseName: 'file-for-upload-in-form-☺😂.txt',
+  formEncoding: 'ISO-2022-JP',
+  expectedEncodedBaseName: (
+      'file-for-upload-in-form-&#226;&#732;&#186;&#240;&#376;&#732;&#8218;.txt'),
+});
+
+formPostFileUploadTest({
+  fileNameSource: 'JIS X 0201 and JIS X 0208',
+  fileBaseName: 'file-for-upload-in-form-★星★.txt',
+  formEncoding: 'ISO-2022-JP',
+  expectedEncodedBaseName: 'file-for-upload-in-form-\x1B$B!z@1!z\x1B(B.txt',
+});
+
+formPostFileUploadTest({
+  fileNameSource: 'Unicode',
+  fileBaseName: 'file-for-upload-in-form-☺😂.txt',
+  formEncoding: 'ISO-2022-JP',
+  expectedEncodedBaseName: 'file-for-upload-in-form-&#9786;&#128514;.txt',
+});
+
+formPostFileUploadTest({
+  fileNameSource: 'Unicode',
+  fileBaseName: `file-for-upload-in-form-${kTestChars}.txt`,
+  formEncoding: 'ISO-2022-JP',
+  expectedEncodedBaseName: `file-for-upload-in-form-${
+      kTestFallbackIso2022jp
+  }.txt`,
+});
+
+</script>
diff --git a/test/wpt/tests/FileAPI/file/send-file-form-punctuation.html b/test/wpt/tests/FileAPI/file/send-file-form-punctuation.html
new file mode 100644
index 00000000000..a6568e2e56e
--- /dev/null
+++ b/test/wpt/tests/FileAPI/file/send-file-form-punctuation.html
@@ -0,0 +1,226 @@
+<!DOCTYPE html>
+<meta charset="utf-8" />
+<title>Upload files named using punctuation</title>
+<link
+  rel="help"
+  href="https://html.spec.whatwg.org/multipage/form-control-infrastructure.html#multipart-form-data"
+/>
+<link
+  rel="help"
+  href="https://html.spec.whatwg.org/multipage/dnd.html#datatransferitemlist"
+/>
+<link rel="help" href="https://w3c.github.io/FileAPI/#file-constructor" />
+<link
+  rel="author"
+  title="Benjamin C. Wiley Sittler"
+  href="mailto:bsittler@chromium.org"
+/>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="../support/send-file-form-helper.js"></script>
+<script>
+  "use strict";
+
+  // These have characters that undergo processing in name=,
+  // filename=, and/or value; formPostFileUploadTest postprocesses
+  // expectedEncodedBaseName for these internally.
+
+  formPostFileUploadTest({
+    fileNameSource: "ASCII",
+    fileBaseName: "file-for-upload-in-form-QUOTATION-MARK-[\x22].txt",
+    formEncoding: "UTF-8",
+    expectedEncodedBaseName:
+      "file-for-upload-in-form-QUOTATION-MARK-[\x22].txt",
+  });
+
+  formPostFileUploadTest({
+    fileNameSource: "ASCII",
+    fileBaseName: '"file-for-upload-in-form-double-quoted.txt"',
+    formEncoding: "UTF-8",
+    expectedEncodedBaseName: '"file-for-upload-in-form-double-quoted.txt"',
+  });
+
+  formPostFileUploadTest({
+    fileNameSource: "ASCII",
+    fileBaseName: "file-for-upload-in-form-REVERSE-SOLIDUS-[\\].txt",
+    formEncoding: "UTF-8",
+    expectedEncodedBaseName:
+      "file-for-upload-in-form-REVERSE-SOLIDUS-[\\].txt",
+  });
+
+  // The rest should be passed through unmodified:
+
+  formPostFileUploadTest({
+    fileNameSource: "ASCII",
+    fileBaseName: "file-for-upload-in-form-EXCLAMATION-MARK-[!].txt",
+    formEncoding: "UTF-8",
+    expectedEncodedBaseName: "file-for-upload-in-form-EXCLAMATION-MARK-[!].txt",
+  });
+
+  formPostFileUploadTest({
+    fileNameSource: "ASCII",
+    fileBaseName: "file-for-upload-in-form-DOLLAR-SIGN-[$].txt",
+    formEncoding: "UTF-8",
+    expectedEncodedBaseName: "file-for-upload-in-form-DOLLAR-SIGN-[$].txt",
+  });
+
+  formPostFileUploadTest({
+    fileNameSource: "ASCII",
+    fileBaseName: "file-for-upload-in-form-PERCENT-SIGN-[%].txt",
+    formEncoding: "UTF-8",
+    expectedEncodedBaseName: "file-for-upload-in-form-PERCENT-SIGN-[%].txt",
+  });
+
+  formPostFileUploadTest({
+    fileNameSource: "ASCII",
+    fileBaseName: "file-for-upload-in-form-AMPERSAND-[&].txt",
+    formEncoding: "UTF-8",
+    expectedEncodedBaseName: "file-for-upload-in-form-AMPERSAND-[&].txt",
+  });
+
+  formPostFileUploadTest({
+    fileNameSource: "ASCII",
+    fileBaseName: "file-for-upload-in-form-APOSTROPHE-['].txt",
+    formEncoding: "UTF-8",
+    expectedEncodedBaseName: "file-for-upload-in-form-APOSTROPHE-['].txt",
+  });
+
+  formPostFileUploadTest({
+    fileNameSource: "ASCII",
+    fileBaseName: "file-for-upload-in-form-LEFT-PARENTHESIS-[(].txt",
+    formEncoding: "UTF-8",
+    expectedEncodedBaseName: "file-for-upload-in-form-LEFT-PARENTHESIS-[(].txt",
+  });
+
+  formPostFileUploadTest({
+    fileNameSource: "ASCII",
+    fileBaseName: "file-for-upload-in-form-RIGHT-PARENTHESIS-[)].txt",
+    formEncoding: "UTF-8",
+    expectedEncodedBaseName:
+      "file-for-upload-in-form-RIGHT-PARENTHESIS-[)].txt",
+  });
+
+  formPostFileUploadTest({
+    fileNameSource: "ASCII",
+    fileBaseName: "file-for-upload-in-form-ASTERISK-[*].txt",
+    formEncoding: "UTF-8",
+    expectedEncodedBaseName: "file-for-upload-in-form-ASTERISK-[*].txt",
+  });
+
+  formPostFileUploadTest({
+    fileNameSource: "ASCII",
+    fileBaseName: "file-for-upload-in-form-PLUS-SIGN-[+].txt",
+    formEncoding: "UTF-8",
+    expectedEncodedBaseName: "file-for-upload-in-form-PLUS-SIGN-[+].txt",
+  });
+
+  formPostFileUploadTest({
+    fileNameSource: "ASCII",
+    fileBaseName: "file-for-upload-in-form-COMMA-[,].txt",
+    formEncoding: "UTF-8",
+    expectedEncodedBaseName: "file-for-upload-in-form-COMMA-[,].txt",
+  });
+
+  formPostFileUploadTest({
+    fileNameSource: "ASCII",
+    fileBaseName: "file-for-upload-in-form-FULL-STOP-[.].txt",
+    formEncoding: "UTF-8",
+    expectedEncodedBaseName: "file-for-upload-in-form-FULL-STOP-[.].txt",
+  });
+
+  formPostFileUploadTest({
+    fileNameSource: "ASCII",
+    fileBaseName: "file-for-upload-in-form-SOLIDUS-[/].txt",
+    formEncoding: "UTF-8",
+    expectedEncodedBaseName: "file-for-upload-in-form-SOLIDUS-[/].txt",
+  });
+
+  formPostFileUploadTest({
+    fileNameSource: "ASCII",
+    fileBaseName: "file-for-upload-in-form-COLON-[:].txt",
+    formEncoding: "UTF-8",
+    expectedEncodedBaseName: "file-for-upload-in-form-COLON-[:].txt",
+  });
+
+  formPostFileUploadTest({
+    fileNameSource: "ASCII",
+    fileBaseName: "file-for-upload-in-form-SEMICOLON-[;].txt",
+    formEncoding: "UTF-8",
+    expectedEncodedBaseName: "file-for-upload-in-form-SEMICOLON-[;].txt",
+  });
+
+  formPostFileUploadTest({
+    fileNameSource: "ASCII",
+    fileBaseName: "file-for-upload-in-form-EQUALS-SIGN-[=].txt",
+    formEncoding: "UTF-8",
+    expectedEncodedBaseName: "file-for-upload-in-form-EQUALS-SIGN-[=].txt",
+  });
+
+  formPostFileUploadTest({
+    fileNameSource: "ASCII",
+    fileBaseName: "file-for-upload-in-form-QUESTION-MARK-[?].txt",
+    formEncoding: "UTF-8",
+    expectedEncodedBaseName: "file-for-upload-in-form-QUESTION-MARK-[?].txt",
+  });
+
+  formPostFileUploadTest({
+    fileNameSource: "ASCII",
+    fileBaseName: "file-for-upload-in-form-CIRCUMFLEX-ACCENT-[^].txt",
+    formEncoding: "UTF-8",
+    expectedEncodedBaseName:
+      "file-for-upload-in-form-CIRCUMFLEX-ACCENT-[^].txt",
+  });
+
+  formPostFileUploadTest({
+    fileNameSource: "ASCII",
+    fileBaseName: "file-for-upload-in-form-LEFT-SQUARE-BRACKET-[[].txt",
+    formEncoding: "UTF-8",
+    expectedEncodedBaseName:
+      "file-for-upload-in-form-LEFT-SQUARE-BRACKET-[[].txt",
+  });
+
+  formPostFileUploadTest({
+    fileNameSource: "ASCII",
+    fileBaseName: "file-for-upload-in-form-RIGHT-SQUARE-BRACKET-[]].txt",
+    formEncoding: "UTF-8",
+    expectedEncodedBaseName:
+      "file-for-upload-in-form-RIGHT-SQUARE-BRACKET-[]].txt",
+  });
+
+  formPostFileUploadTest({
+    fileNameSource: "ASCII",
+    fileBaseName: "file-for-upload-in-form-LEFT-CURLY-BRACKET-[{].txt",
+    formEncoding: "UTF-8",
+    expectedEncodedBaseName:
+      "file-for-upload-in-form-LEFT-CURLY-BRACKET-[{].txt",
+  });
+
+  formPostFileUploadTest({
+    fileNameSource: "ASCII",
+    fileBaseName: "file-for-upload-in-form-VERTICAL-LINE-[|].txt",
+    formEncoding: "UTF-8",
+    expectedEncodedBaseName: "file-for-upload-in-form-VERTICAL-LINE-[|].txt",
+  });
+
+  formPostFileUploadTest({
+    fileNameSource: "ASCII",
+    fileBaseName: "file-for-upload-in-form-RIGHT-CURLY-BRACKET-[}].txt",
+    formEncoding: "UTF-8",
+    expectedEncodedBaseName:
+      "file-for-upload-in-form-RIGHT-CURLY-BRACKET-[}].txt",
+  });
+
+  formPostFileUploadTest({
+    fileNameSource: "ASCII",
+    fileBaseName: "file-for-upload-in-form-TILDE-[~].txt",
+    formEncoding: "UTF-8",
+    expectedEncodedBaseName: "file-for-upload-in-form-TILDE-[~].txt",
+  });
+
+  formPostFileUploadTest({
+    fileNameSource: "ASCII",
+    fileBaseName: "'file-for-upload-in-form-single-quoted.txt'",
+    formEncoding: "UTF-8",
+    expectedEncodedBaseName: "'file-for-upload-in-form-single-quoted.txt'",
+  });
+</script>
diff --git a/test/wpt/tests/FileAPI/file/send-file-form-utf-8.html b/test/wpt/tests/FileAPI/file/send-file-form-utf-8.html
new file mode 100644
index 00000000000..1be44f4f4db
--- /dev/null
+++ b/test/wpt/tests/FileAPI/file/send-file-form-utf-8.html
@@ -0,0 +1,62 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Upload files in UTF-8 form</title>
+<link rel="help"
+      href="https://html.spec.whatwg.org/multipage/form-control-infrastructure.html#multipart-form-data">
+<link rel="help"
+      href="https://html.spec.whatwg.org/multipage/dnd.html#datatransferitemlist">
+<link rel="help"
+      href="https://w3c.github.io/FileAPI/#file-constructor">
+<link rel="author" title="Benjamin C. Wiley Sittler"
+      href="mailto:bsittler@chromium.org">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="../support/send-file-form-helper.js"></script>
+<script>
+'use strict';
+
+formPostFileUploadTest({
+  fileNameSource: 'ASCII',
+  fileBaseName: 'file-for-upload-in-form.txt',
+  formEncoding: 'UTF-8',
+  expectedEncodedBaseName: 'file-for-upload-in-form.txt',
+});
+
+formPostFileUploadTest({
+  fileNameSource: 'x-user-defined',
+  fileBaseName: 'file-for-upload-in-form-\uF7F0\uF793\uF783\uF7A0.txt',
+  formEncoding: 'UTF-8',
+  expectedEncodedBaseName: (
+      'file-for-upload-in-form-\xEF\x9F\xB0\xEF\x9E\x93\xEF\x9E\x83\xEF\x9E\xA0.txt'),
+});
+
+formPostFileUploadTest({
+  fileNameSource: 'windows-1252',
+  fileBaseName: 'file-for-upload-in-form-☺😂.txt',
+  formEncoding: 'UTF-8',
+  expectedEncodedBaseName: (
+      'file-for-upload-in-form-\xC3\xA2\xCB\x9C\xC2\xBA\xC3\xB0\xC5\xB8\xCB\x9C\xE2\x80\x9A.txt'),
+});
+
+formPostFileUploadTest({
+  fileNameSource: 'JIS X 0201 and JIS X 0208',
+  fileBaseName: 'file-for-upload-in-form-★星★.txt',
+  formEncoding: 'UTF-8',
+  expectedEncodedBaseName: 'file-for-upload-in-form-\xE2\x98\x85\xE6\x98\x9F\xE2\x98\x85.txt',
+});
+
+formPostFileUploadTest({
+  fileNameSource: 'Unicode',
+  fileBaseName: 'file-for-upload-in-form-☺😂.txt',
+  formEncoding: 'UTF-8',
+  expectedEncodedBaseName: 'file-for-upload-in-form-\xE2\x98\xBA\xF0\x9F\x98\x82.txt',
+});
+
+formPostFileUploadTest({
+  fileNameSource: 'Unicode',
+  fileBaseName: `file-for-upload-in-form-${kTestChars}.txt`,
+  formEncoding: 'UTF-8',
+  expectedEncodedBaseName: `file-for-upload-in-form-${kTestFallbackUtf8}.txt`,
+});
+
+</script>
diff --git a/test/wpt/tests/FileAPI/file/send-file-form-windows-1252.html b/test/wpt/tests/FileAPI/file/send-file-form-windows-1252.html
new file mode 100644
index 00000000000..21b219ffd2d
--- /dev/null
+++ b/test/wpt/tests/FileAPI/file/send-file-form-windows-1252.html
@@ -0,0 +1,62 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Upload files in Windows-1252 form</title>
+<link rel="help"
+      href="https://html.spec.whatwg.org/multipage/form-control-infrastructure.html#multipart-form-data">
+<link rel="help"
+      href="https://html.spec.whatwg.org/multipage/dnd.html#datatransferitemlist">
+<link rel="help"
+      href="https://w3c.github.io/FileAPI/#file-constructor">
+<link rel="author" title="Benjamin C. Wiley Sittler"
+      href="mailto:bsittler@chromium.org">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="../support/send-file-form-helper.js"></script>
+<script>
+'use strict';
+
+formPostFileUploadTest({
+  fileNameSource: 'ASCII',
+  fileBaseName: 'file-for-upload-in-form.txt',
+  formEncoding: 'windows-1252',
+  expectedEncodedBaseName: 'file-for-upload-in-form.txt',
+});
+
+formPostFileUploadTest({
+  fileNameSource: 'x-user-defined',
+  fileBaseName: 'file-for-upload-in-form-\uF7F0\uF793\uF783\uF7A0.txt',
+  formEncoding: 'windows-1252',
+  expectedEncodedBaseName: 'file-for-upload-in-form-&#63472;&#63379;&#63363;&#63392;.txt',
+});
+
+formPostFileUploadTest({
+  fileNameSource: 'windows-1252',
+  fileBaseName: 'file-for-upload-in-form-☺😂.txt',
+  formEncoding: 'windows-1252',
+  expectedEncodedBaseName: 'file-for-upload-in-form-\xE2\x98\xBA\xF0\x9F\x98\x82.txt',
+});
+
+formPostFileUploadTest({
+  fileNameSource: 'JIS X 0201 and JIS X 0208',
+  fileBaseName: 'file-for-upload-in-form-★星★.txt',
+  formEncoding: 'windows-1252',
+  expectedEncodedBaseName: 'file-for-upload-in-form-&#9733;&#26143;&#9733;.txt',
+});
+
+formPostFileUploadTest({
+  fileNameSource: 'Unicode',
+  fileBaseName: 'file-for-upload-in-form-☺😂.txt',
+  formEncoding: 'windows-1252',
+  expectedEncodedBaseName: 'file-for-upload-in-form-&#9786;&#128514;.txt',
+});
+
+formPostFileUploadTest({
+  fileNameSource: 'Unicode',
+  fileBaseName: `file-for-upload-in-form-${kTestChars}.txt`,
+  formEncoding: 'windows-1252',
+  expectedEncodedBaseName: `file-for-upload-in-form-${
+      kTestFallbackWindows1252
+  }.txt`,
+});
+
+</script>
diff --git a/test/wpt/tests/FileAPI/file/send-file-form-x-user-defined.html b/test/wpt/tests/FileAPI/file/send-file-form-x-user-defined.html
new file mode 100644
index 00000000000..8d6605d86de
--- /dev/null
+++ b/test/wpt/tests/FileAPI/file/send-file-form-x-user-defined.html
@@ -0,0 +1,63 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Upload files in x-user-defined form</title>
+<link rel="help"
+      href="https://html.spec.whatwg.org/multipage/form-control-infrastructure.html#multipart-form-data">
+<link rel="help"
+      href="https://html.spec.whatwg.org/multipage/dnd.html#datatransferitemlist">
+<link rel="help"
+      href="https://w3c.github.io/FileAPI/#file-constructor">
+<link rel="author" title="Benjamin C. Wiley Sittler"
+      href="mailto:bsittler@chromium.org">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="../support/send-file-form-helper.js"></script>
+<script>
+'use strict';
+
+formPostFileUploadTest({
+  fileNameSource: 'ASCII',
+  fileBaseName: 'file-for-upload-in-form.txt',
+  formEncoding: 'x-user-defined',
+  expectedEncodedBaseName: 'file-for-upload-in-form.txt',
+});
+
+formPostFileUploadTest({
+  fileNameSource: 'x-user-defined',
+  fileBaseName: 'file-for-upload-in-form-\uF7F0\uF793\uF783\uF7A0.txt',
+  formEncoding: 'x-user-defined',
+  expectedEncodedBaseName: 'file-for-upload-in-form-\xF0\x93\x83\xA0.txt',
+});
+
+formPostFileUploadTest({
+  fileNameSource: 'windows-1252',
+  fileBaseName: 'file-for-upload-in-form-☺😂.txt',
+  formEncoding: 'x-user-defined',
+  expectedEncodedBaseName: ('file-for-upload-in-form-' +
+                            '&#226;&#732;&#186;&#240;&#376;&#732;&#8218;.txt'),
+});
+
+formPostFileUploadTest({
+  fileNameSource: 'JIS X 0201 and JIS X 0208',
+  fileBaseName: 'file-for-upload-in-form-★星★.txt',
+  formEncoding: 'x-user-defined',
+  expectedEncodedBaseName: 'file-for-upload-in-form-&#9733;&#26143;&#9733;.txt',
+});
+
+formPostFileUploadTest({
+  fileNameSource: 'Unicode',
+  fileBaseName: 'file-for-upload-in-form-☺😂.txt',
+  formEncoding: 'x-user-defined',
+  expectedEncodedBaseName: 'file-for-upload-in-form-&#9786;&#128514;.txt',
+});
+
+formPostFileUploadTest({
+  fileNameSource: 'Unicode',
+  fileBaseName: `file-for-upload-in-form-${kTestChars}.txt`,
+  formEncoding: 'x-user-defined',
+  expectedEncodedBaseName: `file-for-upload-in-form-${
+      kTestFallbackXUserDefined
+  }.txt`,
+});
+
+</script>
diff --git a/test/wpt/tests/FileAPI/file/send-file-form.html b/test/wpt/tests/FileAPI/file/send-file-form.html
new file mode 100644
index 00000000000..baa8d4286c5
--- /dev/null
+++ b/test/wpt/tests/FileAPI/file/send-file-form.html
@@ -0,0 +1,25 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Upload ASCII-named file in UTF-8 form</title>
+<link rel="help"
+      href="https://html.spec.whatwg.org/multipage/form-control-infrastructure.html#multipart-form-data">
+<link rel="help"
+      href="https://html.spec.whatwg.org/multipage/dnd.html#datatransferitemlist">
+<link rel="help"
+      href="https://w3c.github.io/FileAPI/#file-constructor">
+<link rel="author" title="Benjamin C. Wiley Sittler"
+      href="mailto:bsittler@chromium.org">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="../support/send-file-form-helper.js"></script>
+<script>
+'use strict';
+
+formPostFileUploadTest({
+  fileNameSource: 'ASCII',
+  fileBaseName: 'file-for-upload-in-form.txt',
+  formEncoding: 'UTF-8',
+  expectedEncodedBaseName: 'file-for-upload-in-form.txt',
+});
+
+</script>
diff --git a/test/wpt/tests/FileAPI/filelist-section/filelist.html b/test/wpt/tests/FileAPI/filelist-section/filelist.html
new file mode 100644
index 00000000000..b97dcde19f6
--- /dev/null
+++ b/test/wpt/tests/FileAPI/filelist-section/filelist.html
@@ -0,0 +1,57 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset='utf-8'>
+    <title>FileAPI Test: filelist</title>
+    <link rel='author' title='Intel' href='http://www.intel.com'>
+    <link rel='help' href='http://dev.w3.org/2006/webapi/FileAPI/#filelist-section'>
+    <link rel="help" href="http://dev.w3.org/2006/webapi/FileAPI/#dfn-length">
+    <link rel="help" href="http://dev.w3.org/2006/webapi/FileAPI/#dfn-item">
+    <script src='/resources/testharness.js'></script>
+    <script src='/resources/testharnessreport.js'></script>
+  </head>
+
+  <body>
+    <form name='uploadData' style="display:none">
+      <input type='file' id='fileChooser'>
+    </form>
+    <div id='log'></div>
+
+    <script>
+      var fileList;
+
+      setup(function () {
+        fileList = document.querySelector('#fileChooser').files;
+      });
+
+      test(function () {
+        assert_true('FileList' in window, 'window has a FileList property');
+      }, 'Check if window has a FileList property');
+
+      test(function () {
+        assert_equals(FileList.length, 0, 'FileList.length is 0');
+      }, 'Check if FileList.length is 0');
+
+      test(function () {
+        assert_true(fileList.item instanceof Function, 'item is a instanceof Function');
+      }, 'Check if item is a instanceof Function');
+
+      test(function() {
+        assert_inherits(fileList, 'item', 'item is a method of fileList');
+      }, 'Check if item is a method of fileList');
+
+      test(function() {
+        assert_equals(fileList.item(0), null, 'item method returns null');
+      }, 'Check if the item method returns null when no file selected');
+
+      test(function() {
+        assert_inherits(fileList, 'length', 'length is fileList attribute');
+      }, 'Check if length is fileList\'s attribute');
+
+      test(function() {
+        assert_equals(fileList.length, 0, 'fileList length is 0');
+      }, 'Check if the fileList length is 0 when no file selected');
+    </script>
+
+  </body>
+</html>
diff --git a/test/wpt/tests/FileAPI/filelist-section/filelist_multiple_selected_files-manual.html b/test/wpt/tests/FileAPI/filelist-section/filelist_multiple_selected_files-manual.html
new file mode 100644
index 00000000000..2efaa059fa4
--- /dev/null
+++ b/test/wpt/tests/FileAPI/filelist-section/filelist_multiple_selected_files-manual.html
@@ -0,0 +1,64 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset='utf-8'>
+    <title>FileAPI Test: filelist_multiple_selected_files</title>
+    <link rel='author' title='Intel' href='http://www.intel.com'>
+    <link rel='help' href='http://dev.w3.org/2006/webapi/FileAPI/#filelist-section'>
+    <link rel="help" href="http://dev.w3.org/2006/webapi/FileAPI/#dfn-length">
+    <link rel="help" href="http://dev.w3.org/2006/webapi/FileAPI/#dfn-item">
+    <script src='/resources/testharness.js'></script>
+    <script src='/resources/testharnessreport.js'></script>
+  </head>
+
+  <body>
+    <form name='uploadData'>
+      <input type='file' id='fileChooser' multiple>
+    </form>
+    <div>
+      <p>Test steps:</p>
+      <ol>
+        <li>Download <a href='support/upload.txt'>upload.txt</a>, <a href="support/upload.zip">upload.zip</a> to local.</li>
+        <li>Select the local two files (upload.txt, upload.zip) to run the test.</li>
+      </ol>
+    </div>
+
+    <div id='log'></div>
+
+    <script>
+      var fileInput = document.querySelector('#fileChooser');
+      var fileList;
+
+      setup({explicit_done: true, explicit_timeout: true});
+
+      on_event(fileInput, 'change', function(evt) {
+        test(function() {
+          fileList = document.querySelector('#fileChooser').files;
+          assert_equals(fileList.length, 2, 'fileList length is 2');
+        }, 'Check if the fileList length is 2 when selected two files');
+
+        test(function() {
+          fileList = document.querySelector('#fileChooser').files;
+          assert_true(fileList.item(0) instanceof File, 'item method is instanceof File');
+        }, 'Check if the item method returns the File interface when selected two files');
+
+        test(function() {
+          fileList = document.querySelector('#fileChooser').files;
+          assert_not_equals(fileList.item(1), null, 'item(1) is not null');
+        }, 'Check if item(1) is not null when selected two files. Index must be treated by user agents as value for the position of a File object in the FileList, with 0 representing the first file.');
+
+        test(function() {
+          fileList = document.querySelector('#fileChooser').files;
+          assert_equals(fileList.item(2), null, 'item(2) is null');
+        }, 'Check if item(2) is null when selected two files');
+
+        test(function() {
+          fileList = document.querySelector('#fileChooser').files;
+          assert_array_equals([fileList.item(0).name, fileList.item(1).name], ['upload.txt', 'upload.zip'], 'file name string is the name of selected files "upload.txt", "upload.zip"');
+        }, 'Check if the file name string is the name of selected files');
+
+        done();
+      });
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/FileAPI/filelist-section/filelist_selected_file-manual.html b/test/wpt/tests/FileAPI/filelist-section/filelist_selected_file-manual.html
new file mode 100644
index 00000000000..966aadda615
--- /dev/null
+++ b/test/wpt/tests/FileAPI/filelist-section/filelist_selected_file-manual.html
@@ -0,0 +1,64 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset='utf-8'>
+    <title>FileAPI Test: filelist_selected_file</title>
+    <link rel='author' title='Intel' href='http://www.intel.com'>
+    <link rel='help' href='http://dev.w3.org/2006/webapi/FileAPI/#filelist-section'>
+    <link rel="help" href="http://dev.w3.org/2006/webapi/FileAPI/#dfn-length">
+    <link rel="help" href="http://dev.w3.org/2006/webapi/FileAPI/#dfn-item">
+    <script src='/resources/testharness.js'></script>
+    <script src='/resources/testharnessreport.js'></script>
+  </head>
+
+  <body>
+    <form name='uploadData'>
+      <input type='file' id='fileChooser'>
+    </form>
+    <div>
+      <p>Test steps:</p>
+      <ol>
+        <li>Download <a href='support/upload.txt'>upload.txt</a> to local.</li>
+        <li>Select the local upload.txt file to run the test.</li>
+      </ol>
+    </div>
+
+    <div id='log'></div>
+
+    <script>
+      var fileInput = document.querySelector('#fileChooser');
+      var fileList;
+
+      setup({explicit_done: true, explicit_timeout: true});
+
+      on_event(fileInput, 'change', function(evt) {
+        test(function() {
+          fileList = document.querySelector('#fileChooser').files;
+          assert_equals(fileList.length, 1, 'fileList length is 1');
+        }, 'Check if the fileList length is 1 when selected one file');
+
+        test(function() {
+          fileList = document.querySelector('#fileChooser').files;
+          assert_true(fileList.item(0) instanceof File, 'item method is instanceof File');
+        }, 'Check if the item method returns the File interface when selected one file');
+
+        test(function() {
+          fileList = document.querySelector('#fileChooser').files;
+          assert_not_equals(fileList.item(0), null, 'item(0) is not null');
+        }, 'Check if item(0) is not null when selected one file. Index must be treated by user agents as value for the position of a File object in the FileList, with 0 representing the first file.');
+
+        test(function() {
+          fileList = document.querySelector('#fileChooser').files;
+          assert_equals(fileList.item(1), null, 'item(1) is null');
+        }, 'Check if item(1) is null when selected one file only');
+
+        test(function() {
+          fileList = document.querySelector('#fileChooser').files;
+          assert_equals(fileList.item(0).name, 'upload.txt', 'file name string is "upload.txt"');
+        }, 'Check if the file name string is the selected "upload.txt"');
+
+        done();
+      });
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/FileAPI/filelist-section/support/upload.txt b/test/wpt/tests/FileAPI/filelist-section/support/upload.txt
new file mode 100644
index 00000000000..f45965b711f
--- /dev/null
+++ b/test/wpt/tests/FileAPI/filelist-section/support/upload.txt
@@ -0,0 +1 @@
+Hello, this is test file for file upload.
diff --git a/test/wpt/tests/FileAPI/filelist-section/support/upload.zip b/test/wpt/tests/FileAPI/filelist-section/support/upload.zip
new file mode 100644
index 00000000000..a933d6a9494
Binary files /dev/null and b/test/wpt/tests/FileAPI/filelist-section/support/upload.zip differ
diff --git a/test/wpt/tests/FileAPI/historical.https.html b/test/wpt/tests/FileAPI/historical.https.html
new file mode 100644
index 00000000000..4f841f17639
--- /dev/null
+++ b/test/wpt/tests/FileAPI/historical.https.html
@@ -0,0 +1,65 @@
+<!doctype html>
+<html>
+ <head>
+  <meta charset="utf-8">
+  <title>Historical features</title>
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  <script src="/service-workers/service-worker/resources/test-helpers.sub.js"></script>
+ </head>
+ <body>
+  <div id="log"></div>
+  <script>
+    var removedFromWindow = [
+        'toNativeLineEndings',
+        'FileError',
+        'FileException',
+        'FileHandle',
+        'FileRequest',
+        'MutableFile',
+    ];
+
+    removedFromWindow.forEach(function(name) {
+        test(function() {
+            assert_false(name in window);
+        }, '"' + name + '" should not be supported');
+    });
+
+    test(function() {
+        var b = new Blob();
+        var prefixes = ['op', 'moz', 'webkit', 'ms'];
+        for (var i = 0; i < prefixes.length; ++i) {
+            assert_false(prefixes[i]+'Slice' in b, "'"+prefixes[i]+"Slice' in b");
+            assert_false(prefixes[i]+'Slice' in Blob.prototype, "'"+prefixes[i]+"Slice in Blob.prototype");
+        }
+    }, 'Blob should not support slice prefixed');
+
+    test(function() {
+        var prefixes = ['', 'O', 'Moz', 'WebKit', 'MS'];
+        for (var i = 0; i < prefixes.length; ++i) {
+            assert_false(prefixes[i]+'BlobBuilder' in window, prefixes[i]+'BlobBuilder');
+        }
+    }, 'BlobBuilder should not be supported.');
+
+    test(function() {
+        assert_false('createFor' in URL);
+    }, 'createFor method should not be supported');
+
+    test(function() {
+        var b = new Blob();
+        assert_false('close' in b, 'close in b');
+        assert_false('close' in Blob.prototype, 'close in Blob.prototype');
+        assert_false('isClosed' in b, 'isClosed in b');
+        assert_false('isClosed' in Blob.prototype, 'isClosed in Blob.prototype');
+    }, 'Blob.close() should not be supported');
+
+    test(() => {
+      const f = new File([], "");
+      assert_false("lastModifiedDate" in f);
+      assert_false("lastModifiedDate" in File.prototype);
+    }, "File's lastModifiedDate should not be supported");
+
+    service_worker_test('support/historical-serviceworker.js', 'Service worker test setup');
+  </script>
+ </body>
+</html>
diff --git a/test/wpt/tests/FileAPI/idlharness-manual.html b/test/wpt/tests/FileAPI/idlharness-manual.html
new file mode 100644
index 00000000000..c1d8b0c7149
--- /dev/null
+++ b/test/wpt/tests/FileAPI/idlharness-manual.html
@@ -0,0 +1,45 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>File API manual IDL tests</title>
+    <link rel="author" title="Intel" href="http://www.intel.com">
+    <link rel="help" href="http://dev.w3.org/2006/webapi/FileAPI/#conformance">
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <script src="/resources/WebIDLParser.js"></script>
+    <script src="/resources/idlharness.js"></script>
+  </head>
+  <body>
+    <h1>File API manual IDL tests</h1>
+
+    <p>Either download <a href="support/upload.txt">upload.txt</a> and select it below or select an
+    arbitrary local file.</p>
+
+    <form name="uploadData">
+      <input type="file" id="fileChooser">
+    </form>
+
+    <div id="log"></div>
+
+    <script>
+      const fileInput = document.querySelector("#fileChooser");
+
+      setup({explicit_timeout: true});
+
+      idl_test(
+        ['FileAPI'],
+        ['dom', 'html', 'url'],
+        async idl_array => {
+          await new Promise(resolve => {
+            on_event(fileInput, "change", resolve);
+          });
+          idl_array.add_objects({
+            FileList: [fileInput.files],
+            File: [fileInput.files[0]],
+          });
+        }
+      );
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/FileAPI/idlharness.html b/test/wpt/tests/FileAPI/idlharness.html
new file mode 100644
index 00000000000..45e8684f002
--- /dev/null
+++ b/test/wpt/tests/FileAPI/idlharness.html
@@ -0,0 +1,37 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>File API automated IDL tests (requiring dom)</title>
+    <link rel="author" title="Intel" href="http://www.intel.com">
+    <link rel="help" href="http://dev.w3.org/2006/webapi/FileAPI/#conformance">
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <script src="/resources/WebIDLParser.js"></script>
+    <script src="/resources/idlharness.js"></script>
+  </head>
+  <body>
+    <h1>File API automated IDL tests</h1>
+
+    <div id="log"></div>
+
+    <form name="uploadData">
+      <input type="file" id="fileChooser">
+    </form>
+
+    <script>
+      'use strict';
+
+      idl_test(
+        ['FileAPI'],
+        ['dom', 'html', 'url'],
+        idl_array => {
+          idl_array.add_objects({
+            FileList: ['document.querySelector("#fileChooser").files']
+          });
+        }
+      );
+    </script>
+
+  </body>
+</html>
diff --git a/test/wpt/tests/FileAPI/idlharness.worker.js b/test/wpt/tests/FileAPI/idlharness.worker.js
new file mode 100644
index 00000000000..002aaed40a5
--- /dev/null
+++ b/test/wpt/tests/FileAPI/idlharness.worker.js
@@ -0,0 +1,17 @@
+importScripts("/resources/testharness.js");
+importScripts("/resources/WebIDLParser.js", "/resources/idlharness.js");
+
+'use strict';
+
+// https://w3c.github.io/FileAPI/
+
+idl_test(
+  ['FileAPI'],
+  ['dom', 'html', 'url'],
+  idl_array => {
+    idl_array.add_objects({
+      FileReaderSync: ['new FileReaderSync()']
+    });
+  }
+);
+done();
diff --git a/test/wpt/tests/FileAPI/progress-manual.html b/test/wpt/tests/FileAPI/progress-manual.html
new file mode 100644
index 00000000000..b2e03b3eb27
--- /dev/null
+++ b/test/wpt/tests/FileAPI/progress-manual.html
@@ -0,0 +1,49 @@
+<!DOCTYPE html>
+<meta charset=utf-8>
+<title>Process Events for FileReader</title>
+<link rel=help href="http://dev.w3.org/2006/webapi/FileAPI/#event-handler-attributes-section">
+<link rel=author title="Jinks Zhao" href="mailto:jinks@maxthon.com">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+Please choose one file through this input below.<br>
+<input type="file" id="filer">
+<div id="log"></div>
+<script>
+var input, reader, progressEventCounter, progressEventTimeList,
+    lastProgressEventTime;
+setup(function() {
+    input = document.getElementById('filer');
+    reader = new FileReader();
+    progressEventCounter = 0;
+    progressEventTimeList = [];
+    lastProgressEventTime;
+}, { explicit_timeout: true });
+
+var t = async_test("FileReader progress events.")
+
+reader.onprogress = t.step_func(function () {
+    var newTime = new Date;
+    var timeout = newTime - lastProgressEventTime;
+
+    progressEventTimeList.push(timeout);
+    lastProgressEventTime = newTime;
+    progressEventCounter++;
+
+    assert_less_than_equal(timeout, 50, "The progress event should be fired every 50ms.");
+});
+
+reader.onload = t.step_func_done(function () {
+    assert_greater_than_equal(progressEventCounter, 1,
+                              "When read completely, the progress event must be fired at least once.")
+});
+
+input.onchange = t.step_func(function () {
+    var files = input.files;
+
+    assert_greater_than(files.length, 0);
+    var file = files[0];
+
+    lastProgressEventTime = new Date;
+    reader.readAsArrayBuffer(file);
+});
+</script>
diff --git a/test/wpt/tests/FileAPI/reading-data-section/filereader_file-manual.html b/test/wpt/tests/FileAPI/reading-data-section/filereader_file-manual.html
new file mode 100644
index 00000000000..702ca9afd7b
--- /dev/null
+++ b/test/wpt/tests/FileAPI/reading-data-section/filereader_file-manual.html
@@ -0,0 +1,69 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>FileAPI Test: filereader_file</title>
+    <link rel="author" title="Intel" href="http://www.intel.com">
+    <link rel="help" href="http://dev.w3.org/2006/webapi/FileAPI/#FileReader-interface">
+    <link rel="help" href="http://dev.w3.org/2006/webapi/FileAPI/#file">
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+  </head>
+  <body>
+    <div>
+      <p>Test step:</p>
+      <ol>
+        <li>Download <a href="support/blue-100x100.png">blue-100x100.png</a> to local.</li>
+        <li>Select the local file (blue-100x100.png) to run the test.</li>
+      </ol>
+    </div>
+
+    <form name="uploadData">
+      <input type="file" id="fileChooser">
+    </form>
+
+    <div id="log"></div>
+    <script>
+      var fileInput = document.querySelector('#fileChooser');
+      var reader = new FileReader();
+
+      //readType: 1-> ArrayBuffer, 2-> Text, 3-> DataURL
+      var readType = 1;
+
+      setup({
+        explicit_done: true,
+        explicit_timeout: true,
+      });
+
+      on_event(fileInput, "change", function(evt) {
+        reader.readAsArrayBuffer(fileInput.files[0]);
+      });
+
+      on_event(reader, "load", function(evt) {
+        if (readType == 1) {
+          test(function() {
+            assert_true(reader.result instanceof ArrayBuffer, "The result is instanceof ArrayBuffer");
+          }, "Check if the readAsArrayBuffer works");
+
+          readType++;
+          reader.readAsText(fileInput.files[0]);
+        } else if (readType == 2) {
+          test(function() {
+            assert_equals(typeof reader.result, "string", "The result is typeof string");
+          }, "Check if the readAsText works");
+
+          readType++;
+          reader.readAsDataURL(fileInput.files[0]);
+        } else if (readType == 3) {
+          test(function() {
+            assert_equals(typeof reader.result, "string", "The result is typeof string");
+            assert_equals(reader.result.indexOf("data"), 0, "The result starts with 'data'");
+            assert_true(reader.result.indexOf("base64") > 0, "The result contains 'base64'");
+          }, "Check if the readAsDataURL works");
+
+          done();
+        }
+      });
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/FileAPI/reading-data-section/filereader_file_img-manual.html b/test/wpt/tests/FileAPI/reading-data-section/filereader_file_img-manual.html
new file mode 100644
index 00000000000..fca42c7fceb
--- /dev/null
+++ b/test/wpt/tests/FileAPI/reading-data-section/filereader_file_img-manual.html
@@ -0,0 +1,47 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>FileAPI Test: filereader_file_img</title>
+    <link rel="author" title="Intel" href="http://www.intel.com">
+    <link rel="help" href="http://dev.w3.org/2006/webapi/FileAPI/#FileReader-interface">
+    <link rel="help" href="http://dev.w3.org/2006/webapi/FileAPI/#file">
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+  </head>
+  <body>
+    <div>
+      <p>Test step:</p>
+      <ol>
+        <li>Download <a href="support/blue-100x100.png">blue-100x100.png</a> to local.</li>
+        <li>Select the local file (blue-100x100.png) to run the test.</li>
+      </ol>
+    </div>
+
+    <form name="uploadData">
+      <input type="file" id="fileChooser">
+    </form>
+
+    <div id="log"></div>
+    <script>
+      var fileInput = document.querySelector('#fileChooser');
+      var reader = new FileReader();
+
+      setup({
+        explicit_done: true,
+        explicit_timeout: true,
+      });
+
+      fileInput.addEventListener("change", function(evt) {
+        reader.readAsDataURL(fileInput.files[0]);
+      }, false);
+
+      reader.addEventListener("loadend", function(evt) {
+        test(function () {
+          assert_true(reader.result.indexOf("iVBORw0KGgoAAAANSUhEUgAAAGQAAABkCAYAAABw4pVUAAAAqklEQVR42u3RsREAMAgDMe+/M4E7ZkhBoeI9gJWkWpfaeToTECACAkRAgAgIEAEB4gQgAgJEQIAICBABASIgAgJEQIAICBABASIgAgJEQIAICBABASIgAgJEQIAICBABASIgAgJEQIAICBABASIgAgJEQIAICBABASIgAgJEQIAICBABASIgAgJEQIAICBABASIgAgJEQIAICBABASIgQJwARECACAgQ/W4AQauujc8IdAoAAAAASUVORK5CYII=") != -1, "Encoded image")
+        }, "Check if readAsDataURL returns correct image");
+        done();
+      }, false);
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/FileAPI/reading-data-section/filereader_result.any.js b/test/wpt/tests/FileAPI/reading-data-section/filereader_result.any.js
new file mode 100644
index 00000000000..28c068bb349
--- /dev/null
+++ b/test/wpt/tests/FileAPI/reading-data-section/filereader_result.any.js
@@ -0,0 +1,82 @@
+// META: title=FileAPI Test: filereader_result
+
+    var blob, blob2;
+    setup(function() {
+      blob = new Blob(["This test the result attribute"]);
+      blob2 = new Blob(["This is a second blob"]);
+    });
+
+    async_test(function() {
+      var readText = new FileReader();
+      assert_equals(readText.result, null);
+
+      readText.onloadend = this.step_func(function(evt) {
+        assert_equals(typeof readText.result, "string", "The result type is string");
+        assert_equals(readText.result, "This test the result attribute", "The result is correct");
+        this.done();
+      });
+
+      readText.readAsText(blob);
+    }, "readAsText");
+
+    async_test(function() {
+      var readDataURL = new FileReader();
+      assert_equals(readDataURL.result, null);
+
+      readDataURL.onloadend = this.step_func(function(evt) {
+        assert_equals(typeof readDataURL.result, "string", "The result type is string");
+        assert_true(readDataURL.result.indexOf("VGhpcyB0ZXN0IHRoZSByZXN1bHQgYXR0cmlidXRl") != -1, "return the right base64 string");
+        this.done();
+      });
+
+      readDataURL.readAsDataURL(blob);
+    }, "readAsDataURL");
+
+    async_test(function() {
+      var readArrayBuffer = new FileReader();
+      assert_equals(readArrayBuffer.result, null);
+
+      readArrayBuffer.onloadend = this.step_func(function(evt) {
+        assert_true(readArrayBuffer.result instanceof ArrayBuffer, "The result is instanceof ArrayBuffer");
+        this.done();
+      });
+
+      readArrayBuffer.readAsArrayBuffer(blob);
+    }, "readAsArrayBuffer");
+
+    async_test(function() {
+      var readBinaryString = new FileReader();
+      assert_equals(readBinaryString.result, null);
+
+      readBinaryString.onloadend = this.step_func(function(evt) {
+        assert_equals(typeof readBinaryString.result, "string", "The result type is string");
+        assert_equals(readBinaryString.result, "This test the result attribute", "The result is correct");
+        this.done();
+      });
+
+      readBinaryString.readAsBinaryString(blob);
+    }, "readAsBinaryString");
+
+
+    for (let event of ['loadstart', 'progress']) {
+      for (let method of ['readAsText', 'readAsDataURL', 'readAsArrayBuffer', 'readAsBinaryString']) {
+        promise_test(async function(t) {
+          var reader = new FileReader();
+          assert_equals(reader.result, null, 'result is null before read');
+
+          var eventWatcher = new EventWatcher(t, reader,
+              [event, 'loadend']);
+
+          reader[method](blob);
+          assert_equals(reader.result, null, 'result is null after first read call');
+          await eventWatcher.wait_for(event);
+          assert_equals(reader.result, null, 'result is null during event');
+          await eventWatcher.wait_for('loadend');
+          assert_not_equals(reader.result, null);
+          reader[method](blob);
+          assert_equals(reader.result, null, 'result is null after second read call');
+          await eventWatcher.wait_for(event);
+          assert_equals(reader.result, null, 'result is null during second read event');
+        }, 'result is null during "' + event + '" event for ' + method);
+      }
+    }
diff --git a/test/wpt/tests/FileAPI/reading-data-section/support/blue-100x100.png b/test/wpt/tests/FileAPI/reading-data-section/support/blue-100x100.png
new file mode 100644
index 00000000000..5748719ff22
Binary files /dev/null and b/test/wpt/tests/FileAPI/reading-data-section/support/blue-100x100.png differ
diff --git a/test/wpt/tests/FileAPI/support/Blob.js b/test/wpt/tests/FileAPI/support/Blob.js
new file mode 100644
index 00000000000..2c249746858
--- /dev/null
+++ b/test/wpt/tests/FileAPI/support/Blob.js
@@ -0,0 +1,70 @@
+'use strict'
+
+self.test_blob = (fn, expectations) => {
+  var expected = expectations.expected,
+      type = expectations.type,
+      desc = expectations.desc;
+
+  var t = async_test(desc);
+  t.step(function() {
+    var blob = fn();
+    assert_true(blob instanceof Blob);
+    assert_false(blob instanceof File);
+    assert_equals(blob.type, type);
+    assert_equals(blob.size, expected.length);
+
+    var fr = new FileReader();
+    fr.onload = t.step_func_done(function(event) {
+      assert_equals(this.result, expected);
+    }, fr);
+    fr.onerror = t.step_func(function(e) {
+      assert_unreached("got error event on FileReader");
+    });
+    fr.readAsText(blob, "UTF-8");
+  });
+}
+
+self.test_blob_binary = (fn, expectations) => {
+  var expected = expectations.expected,
+      type = expectations.type,
+      desc = expectations.desc;
+
+  var t = async_test(desc);
+  t.step(function() {
+    var blob = fn();
+    assert_true(blob instanceof Blob);
+    assert_false(blob instanceof File);
+    assert_equals(blob.type, type);
+    assert_equals(blob.size, expected.length);
+
+    var fr = new FileReader();
+    fr.onload = t.step_func_done(function(event) {
+      assert_true(this.result instanceof ArrayBuffer,
+                  "Result should be an ArrayBuffer");
+      assert_array_equals(new Uint8Array(this.result), expected);
+    }, fr);
+    fr.onerror = t.step_func(function(e) {
+      assert_unreached("got error event on FileReader");
+    });
+    fr.readAsArrayBuffer(blob);
+  });
+}
+
+// Assert that two TypedArray objects have the same byte values
+self.assert_equals_typed_array = (array1, array2) => {
+  const [view1, view2] = [array1, array2].map((array) => {
+    assert_true(array.buffer instanceof ArrayBuffer,
+      'Expect input ArrayBuffers to contain field `buffer`');
+    return new DataView(array.buffer, array.byteOffset, array.byteLength);
+  });
+
+  assert_equals(view1.byteLength, view2.byteLength,
+    'Expect both arrays to be of the same byte length');
+
+  const byteLength = view1.byteLength;
+
+  for (let i = 0; i < byteLength; ++i) {
+    assert_equals(view1.getUint8(i), view2.getUint8(i),
+      `Expect byte at buffer position ${i} to be equal`);
+  }
+}
diff --git a/test/wpt/tests/FileAPI/support/document-domain-setter.sub.html b/test/wpt/tests/FileAPI/support/document-domain-setter.sub.html
new file mode 100644
index 00000000000..61aebdf3266
--- /dev/null
+++ b/test/wpt/tests/FileAPI/support/document-domain-setter.sub.html
@@ -0,0 +1,7 @@
+<!DOCTYPE html>
+<title>Relevant/current/blob source page used as a test helper</title>
+
+<script>
+"use strict";
+document.domain = "{{host}}";
+</script>
diff --git a/test/wpt/tests/FileAPI/support/empty-document.html b/test/wpt/tests/FileAPI/support/empty-document.html
new file mode 100644
index 00000000000..b9cd130a07f
--- /dev/null
+++ b/test/wpt/tests/FileAPI/support/empty-document.html
@@ -0,0 +1,3 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<body>
diff --git a/test/wpt/tests/FileAPI/support/historical-serviceworker.js b/test/wpt/tests/FileAPI/support/historical-serviceworker.js
new file mode 100644
index 00000000000..8bd89a23adb
--- /dev/null
+++ b/test/wpt/tests/FileAPI/support/historical-serviceworker.js
@@ -0,0 +1,5 @@
+importScripts('/resources/testharness.js');
+
+test(() => {
+  assert_false('FileReaderSync' in self);
+}, '"FileReaderSync" should not be supported in service workers');
diff --git a/test/wpt/tests/FileAPI/support/incumbent.sub.html b/test/wpt/tests/FileAPI/support/incumbent.sub.html
new file mode 100644
index 00000000000..63a81cd3281
--- /dev/null
+++ b/test/wpt/tests/FileAPI/support/incumbent.sub.html
@@ -0,0 +1,22 @@
+<!DOCTYPE html>
+<title>Incumbent page used as a test helper</title>
+
+<iframe src="//{{domains[www1]}}:{{location[port]}}/FileAPI/support/document-domain-setter.sub.html" id="c"></iframe>
+<iframe src="//{{domains[www2]}}:{{location[port]}}/FileAPI/support/document-domain-setter.sub.html" id="r"></iframe>
+<iframe src="//{{domains[élève]}}:{{location[port]}}/FileAPI/support/document-domain-setter.sub.html" id="bs"></iframe>
+
+<script>
+"use strict";
+document.domain = "{{host}}";
+
+window.createBlobURL = () => {
+    const current = document.querySelector("#c").contentWindow;
+    const relevant = document.querySelector("#r").contentWindow;
+    const blobSource = document.querySelector("#bs").contentWindow;
+
+    const blob = new blobSource.Blob(["Test Blob"]);
+
+    return current.URL.createObjectURL.call(relevant, blob);
+};
+
+</script>
diff --git a/test/wpt/tests/FileAPI/support/send-file-form-helper.js b/test/wpt/tests/FileAPI/support/send-file-form-helper.js
new file mode 100644
index 00000000000..d6adf21ec33
--- /dev/null
+++ b/test/wpt/tests/FileAPI/support/send-file-form-helper.js
@@ -0,0 +1,282 @@
+'use strict';
+
+// See /FileAPI/file/resources/echo-content-escaped.py
+function escapeString(string) {
+  return string.replace(/\\/g, "\\\\").replace(
+    /[^\x20-\x7E]/g,
+    (x) => {
+      let hex = x.charCodeAt(0).toString(16);
+      if (hex.length < 2) hex = "0" + hex;
+      return `\\x${hex}`;
+    },
+  ).replace(/\\x0d\\x0a/g, "\r\n");
+}
+
+// Rationale for this particular test character sequence, which is
+// used in filenames and also in file contents:
+//
+// - ABC~ ensures the string starts with something we can read to
+//   ensure it is from the correct source; ~ is used because even
+//   some 1-byte otherwise-ASCII-like parts of ISO-2022-JP
+//   interpret it differently.
+// - ‾¥ are inside a single-byte range of ISO-2022-JP and help
+//   diagnose problems due to filesystem encoding or locale
+// - ≈ is inside IBM437 and helps diagnose problems due to filesystem
+//   encoding or locale
+// - ¤ is inside Latin-1 and helps diagnose problems due to
+//   filesystem encoding or locale; it is also the "simplest" case
+//   needing substitution in ISO-2022-JP
+// - ･ is inside a single-byte range of ISO-2022-JP in some variants
+//   and helps diagnose problems due to filesystem encoding or locale;
+//   on the web it is distinct when decoding but unified when encoding
+// - ・ is inside a double-byte range of ISO-2022-JP and helps
+//   diagnose problems due to filesystem encoding or locale
+// - • is inside Windows-1252 and helps diagnose problems due to
+//   filesystem encoding or locale and also ensures these aren't
+//   accidentally turned into e.g. control codes
+// - ∙ is inside IBM437 and helps diagnose problems due to filesystem
+//   encoding or locale
+// - · is inside Latin-1 and helps diagnose problems due to
+//   filesystem encoding or locale and also ensures HTML named
+//   character references (e.g. &middot;) are not used
+// - ☼ is inside IBM437 shadowing C0 and helps diagnose problems due to
+//   filesystem encoding or locale and also ensures these aren't
+//   accidentally turned into e.g. control codes
+// - ★ is inside ISO-2022-JP on a non-Kanji page and makes correct
+//   output easier to spot
+// - 星 is inside ISO-2022-JP on a Kanji page and makes correct
+//   output easier to spot
+// - 🌟 is outside the BMP and makes incorrect surrogate pair
+//   substitution detectable and ensures substitutions work
+//   correctly immediately after Kanji 2-byte ISO-2022-JP
+// - 星 repeated here ensures the correct codec state is used
+//   after a non-BMP substitution
+// - ★ repeated here also makes correct output easier to spot
+// - ☼ is inside IBM437 shadowing C0 and helps diagnose problems due to
+//   filesystem encoding or locale and also ensures these aren't
+//   accidentally turned into e.g. control codes and also ensures
+//   substitutions work correctly immediately after non-Kanji
+//   2-byte ISO-2022-JP
+// - · is inside Latin-1 and helps diagnose problems due to
+//   filesystem encoding or locale and also ensures HTML named
+//   character references (e.g. &middot;) are not used
+// - ∙ is inside IBM437 and helps diagnose problems due to filesystem
+//   encoding or locale
+// - • is inside Windows-1252 and again helps diagnose problems
+//   due to filesystem encoding or locale
+// - ・ is inside a double-byte range of ISO-2022-JP and helps
+//   diagnose problems due to filesystem encoding or locale
+// - ･ is inside a single-byte range of ISO-2022-JP in some variants
+//   and helps diagnose problems due to filesystem encoding or locale;
+//   on the web it is distinct when decoding but unified when encoding
+// - ¤ is inside Latin-1 and helps diagnose problems due to
+//   filesystem encoding or locale; again it is a "simple"
+//   substitution case
+// - ≈ is inside IBM437 and helps diagnose problems due to filesystem
+//   encoding or locale
+// - ¥‾ are inside a single-byte range of ISO-2022-JP and help
+//   diagnose problems due to filesystem encoding or locale
+// - ~XYZ ensures earlier errors don't lead to misencoding of
+//   simple ASCII
+//
+// Overall the near-symmetry makes common I18N mistakes like
+// off-by-1-after-non-BMP easier to spot. All the characters
+// are also allowed in Windows Unicode filenames.
+const kTestChars = 'ABC~‾¥≈¤･・•∙·☼★星🌟星★☼·∙•・･¤≈¥‾~XYZ';
+
+// The kTestFallback* strings represent the expected byte sequence from
+// encoding kTestChars with the given encoding with "html" replacement
+// mode, isomorphic-decoded. That means, characters that can't be
+// encoded in that encoding get HTML-escaped, but no further
+// `escapeString`-like escapes are needed.
+const kTestFallbackUtf8 = (
+  "ABC~\xE2\x80\xBE\xC2\xA5\xE2\x89\x88\xC2\xA4\xEF\xBD\xA5\xE3\x83\xBB\xE2" +
+    "\x80\xA2\xE2\x88\x99\xC2\xB7\xE2\x98\xBC\xE2\x98\x85\xE6\x98\x9F\xF0\x9F" +
+    "\x8C\x9F\xE6\x98\x9F\xE2\x98\x85\xE2\x98\xBC\xC2\xB7\xE2\x88\x99\xE2\x80" +
+    "\xA2\xE3\x83\xBB\xEF\xBD\xA5\xC2\xA4\xE2\x89\x88\xC2\xA5\xE2\x80\xBE~XYZ"
+);
+
+const kTestFallbackIso2022jp = (
+  ("ABC~\x1B(J~\\≈¤\x1B$B!&!&\x1B(B•∙·☼\x1B$B!z@1\x1B(B🌟" +
+    "\x1B$B@1!z\x1B(B☼·∙•\x1B$B!&!&\x1B(B¤≈\x1B(J\\~\x1B(B~XYZ")
+    .replace(/[^\0-\x7F]/gu, (x) => `&#${x.codePointAt(0)};`)
+);
+
+const kTestFallbackWindows1252 = (
+  "ABC~‾\xA5≈\xA4･・\x95∙\xB7☼★星🌟星★☼\xB7∙\x95・･\xA4≈\xA5‾~XYZ".replace(
+    /[^\0-\xFF]/gu,
+    (x) => `&#${x.codePointAt(0)};`,
+  )
+);
+
+const kTestFallbackXUserDefined = kTestChars.replace(
+  /[^\0-\x7F]/gu,
+  (x) => `&#${x.codePointAt(0)};`,
+);
+
+// formPostFileUploadTest - verifies multipart upload structure and
+// numeric character reference replacement for filenames, field names,
+// and field values using form submission.
+//
+// Uses /FileAPI/file/resources/echo-content-escaped.py to echo the
+// upload POST with controls and non-ASCII bytes escaped. This is done
+// because navigations whose response body contains [\0\b\v] may get
+// treated as a download, which is not what we want. Use the
+// `escapeString` function to replicate that kind of escape (note that
+// it takes an isomorphic-decoded string, not a byte sequence).
+//
+// Fields in the parameter object:
+//
+// - fileNameSource: purely explanatory and gives a clue about which
+//   character encoding is the source for the non-7-bit-ASCII parts of
+//   the fileBaseName, or Unicode if no smaller-than-Unicode source
+//   contains all the characters. Used in the test name.
+// - fileBaseName: the not-necessarily-just-7-bit-ASCII file basename
+//   used for the constructed test file. Used in the test name.
+// - formEncoding: the acceptCharset of the form used to submit the
+//   test file. Used in the test name.
+// - expectedEncodedBaseName: the expected formEncoding-encoded
+//   version of fileBaseName, isomorphic-decoded. That means, characters
+//   that can't be encoded in that encoding get HTML-escaped, but no
+//   further `escapeString`-like escapes are needed.
+const formPostFileUploadTest = ({
+  fileNameSource,
+  fileBaseName,
+  formEncoding,
+  expectedEncodedBaseName,
+}) => {
+  promise_test(async testCase => {
+
+    if (document.readyState !== 'complete') {
+      await new Promise(resolve => addEventListener('load', resolve));
+    }
+
+    const formTargetFrame = Object.assign(document.createElement('iframe'), {
+      name: 'formtargetframe',
+    });
+    document.body.append(formTargetFrame);
+    testCase.add_cleanup(() => {
+      document.body.removeChild(formTargetFrame);
+    });
+
+    const form = Object.assign(document.createElement('form'), {
+      acceptCharset: formEncoding,
+      action: '/FileAPI/file/resources/echo-content-escaped.py',
+      method: 'POST',
+      enctype: 'multipart/form-data',
+      target: formTargetFrame.name,
+    });
+    document.body.append(form);
+    testCase.add_cleanup(() => {
+      document.body.removeChild(form);
+    });
+
+    // Used to verify that the browser agrees with the test about
+    // which form charset is used.
+    form.append(Object.assign(document.createElement('input'), {
+      type: 'hidden',
+      name: '_charset_',
+    }));
+
+    // Used to verify that the browser agrees with the test about
+    // field value replacement and encoding independently of file system
+    // idiosyncracies.
+    form.append(Object.assign(document.createElement('input'), {
+      type: 'hidden',
+      name: 'filename',
+      value: fileBaseName,
+    }));
+
+    // Same, but with name and value reversed to ensure field names
+    // get the same treatment.
+    form.append(Object.assign(document.createElement('input'), {
+      type: 'hidden',
+      name: fileBaseName,
+      value: 'filename',
+    }));
+
+    const fileInput = Object.assign(document.createElement('input'), {
+      type: 'file',
+      name: 'file',
+    });
+    form.append(fileInput);
+
+    // Removes c:\fakepath\ or other pseudofolder and returns just the
+    // final component of filePath; allows both / and \ as segment
+    // delimiters.
+    const baseNameOfFilePath = filePath => filePath.split(/[\/\\]/).pop();
+    await new Promise(resolve => {
+      const dataTransfer = new DataTransfer;
+      dataTransfer.items.add(
+          new File([kTestChars], fileBaseName, {type: 'text/plain'}));
+      fileInput.files = dataTransfer.files;
+      // For historical reasons .value will be prefixed with
+      // c:\fakepath\, but the basename should match the file name
+      // exposed through the newer .files[0].name API. This check
+      // verifies that assumption.
+      assert_equals(
+          baseNameOfFilePath(fileInput.files[0].name),
+          baseNameOfFilePath(fileInput.value),
+          `The basename of the field's value should match its files[0].name`);
+      form.submit();
+      formTargetFrame.onload = resolve;
+    });
+
+    const formDataText = formTargetFrame.contentDocument.body.textContent;
+    const formDataLines = formDataText.split('\n');
+    if (formDataLines.length && !formDataLines[formDataLines.length - 1]) {
+      --formDataLines.length;
+    }
+    assert_greater_than(
+        formDataLines.length,
+        2,
+        `${fileBaseName}: multipart form data must have at least 3 lines: ${
+             JSON.stringify(formDataText)
+           }`);
+    const boundary = formDataLines[0];
+    assert_equals(
+        formDataLines[formDataLines.length - 1],
+        boundary + '--',
+        `${fileBaseName}: multipart form data must end with ${boundary}--: ${
+             JSON.stringify(formDataText)
+           }`);
+
+    const asValue = expectedEncodedBaseName.replace(/\r\n?|\n/g, "\r\n");
+    const asName = asValue.replace(/[\r\n"]/g, encodeURIComponent);
+    const asFilename = expectedEncodedBaseName.replace(/[\r\n"]/g, encodeURIComponent);
+
+    // The response body from echo-content-escaped.py has controls and non-ASCII
+    // bytes escaped, so any caller-provided field that might contain such bytes
+    // must be passed to `escapeString`, after any other expected
+    // transformations.
+    const expectedText = [
+      boundary,
+      'Content-Disposition: form-data; name="_charset_"',
+      '',
+      formEncoding,
+      boundary,
+      'Content-Disposition: form-data; name="filename"',
+      '',
+      // Unlike for names and filenames, multipart/form-data values don't escape
+      // \r\n linebreaks, and when they're read from an iframe they become \n.
+      escapeString(asValue).replace(/\r\n/g, "\n"),
+      boundary,
+      `Content-Disposition: form-data; name="${escapeString(asName)}"`,
+      '',
+      'filename',
+      boundary,
+      `Content-Disposition: form-data; name="file"; ` +
+          `filename="${escapeString(asFilename)}"`,
+      'Content-Type: text/plain',
+      '',
+      escapeString(kTestFallbackUtf8),
+      boundary + '--',
+    ].join('\n');
+
+    assert_true(
+        formDataText.startsWith(expectedText),
+        `Unexpected multipart-shaped form data received:\n${
+             formDataText
+           }\nExpected:\n${expectedText}`);
+  }, `Upload ${fileBaseName} (${fileNameSource}) in ${formEncoding} form`);
+};
diff --git a/test/wpt/tests/FileAPI/support/upload.txt b/test/wpt/tests/FileAPI/support/upload.txt
new file mode 100644
index 00000000000..5ab2f8a4323
--- /dev/null
+++ b/test/wpt/tests/FileAPI/support/upload.txt
@@ -0,0 +1 @@
+Hello
\ No newline at end of file
diff --git a/test/wpt/tests/FileAPI/support/url-origin.html b/test/wpt/tests/FileAPI/support/url-origin.html
new file mode 100644
index 00000000000..63755113915
--- /dev/null
+++ b/test/wpt/tests/FileAPI/support/url-origin.html
@@ -0,0 +1,6 @@
+<!DOCTYPE html>
+<script>
+const blob = new Blob(["Test Blob"]);
+const url = URL.createObjectURL(blob);
+window.parent.postMessage({url: url}, '*');
+</script>
diff --git a/test/wpt/tests/FileAPI/unicode.html b/test/wpt/tests/FileAPI/unicode.html
new file mode 100644
index 00000000000..ce3e3579d7c
--- /dev/null
+++ b/test/wpt/tests/FileAPI/unicode.html
@@ -0,0 +1,46 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Blob/Unicode interaction: normalization and encoding</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script>
+'use strict';
+
+const OMICRON_WITH_OXIA = '\u1F79'; // NFC normalized to U+3CC
+const CONTAINS_UNPAIRED_SURROGATES = 'abc\uDC00def\uD800ghi';
+const REPLACED = 'abc\uFFFDdef\uFFFDghi';
+
+function readBlobAsPromise(blob) {
+  return new Promise((resolve, reject) => {
+    const reader = new FileReader();
+    reader.readAsText(blob);
+    reader.onload = () => resolve(reader.result);
+    reader.onerror = () => reject(reader.error);
+  });
+}
+
+promise_test(async t => {
+  const blob = new Blob([OMICRON_WITH_OXIA]);
+  const result = await readBlobAsPromise(blob);
+  assert_equals(result, OMICRON_WITH_OXIA, 'String should not be normalized');
+}, 'Test that strings are not NFC normalized by Blob constructor');
+
+promise_test(async t => {
+  const file = new File([OMICRON_WITH_OXIA], 'name');
+  const result = await readBlobAsPromise(file);
+  assert_equals(result, OMICRON_WITH_OXIA, 'String should not be normalized');
+}, 'Test that strings are not NFC normalized by File constructor');
+
+promise_test(async t => {
+  const blob = new Blob([CONTAINS_UNPAIRED_SURROGATES]);
+  const result = await readBlobAsPromise(blob);
+  assert_equals(result, REPLACED, 'Unpaired surrogates should be replaced.');
+}, 'Test that unpaired surrogates are replaced by Blob constructor');
+
+promise_test(async t => {
+  const file = new File([CONTAINS_UNPAIRED_SURROGATES], 'name');
+  const result = await readBlobAsPromise(file);
+  assert_equals(result, REPLACED, 'Unpaired surrogates should be replaced.');
+}, 'Test that unpaired surrogates are replaced by File constructor');
+
+</script>
diff --git a/test/wpt/tests/FileAPI/url/cross-global-revoke.sub.html b/test/wpt/tests/FileAPI/url/cross-global-revoke.sub.html
new file mode 100644
index 00000000000..ce9d680709e
--- /dev/null
+++ b/test/wpt/tests/FileAPI/url/cross-global-revoke.sub.html
@@ -0,0 +1,62 @@
+<!doctype html>
+<meta charset="utf-8">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/common/get-host-info.sub.js"></script>
+<body>
+<script>
+async_test(t => {
+  const blob_contents = 'test blob contents';
+  const blob = new Blob([blob_contents]);
+  const url = URL.createObjectURL(blob);
+  const frame = document.createElement('iframe');
+  frame.setAttribute('style', 'display:none;');
+  frame.src = 'resources/revoke-helper.html';
+  document.body.appendChild(frame);
+
+  frame.onload = t.step_func(e => {
+    frame.contentWindow.postMessage({url: url}, '*');
+  });
+
+  self.addEventListener('message', t.step_func(e => {
+    if (e.source !== frame.contentWindow) return;
+    assert_equals(e.data, 'revoked');
+    promise_rejects_js(t, TypeError, fetch(url)).then(t.step_func_done());
+  }));
+}, 'It is possible to revoke same-origin blob URLs from different frames.');
+
+async_test(t => {
+  const blob_contents = 'test blob contents';
+  const blob = new Blob([blob_contents]);
+  const url = URL.createObjectURL(blob);
+  const worker = new Worker('resources/revoke-helper.js');
+  worker.onmessage = t.step_func(e => {
+    assert_equals(e.data, 'revoked');
+    promise_rejects_js(t, TypeError, fetch(url)).then(t.step_func_done());
+  });
+  worker.postMessage({url: url});
+}, 'It is possible to revoke same-origin blob URLs from a different worker global.');
+
+async_test(t => {
+  const blob_contents = 'test blob contents';
+  const blob = new Blob([blob_contents]);
+  const url = URL.createObjectURL(blob);
+  const frame = document.createElement('iframe');
+  frame.setAttribute('style', 'display:none;');
+  frame.src = get_host_info().HTTP_REMOTE_ORIGIN + '/FileAPI/url/resources/revoke-helper.html';
+  document.body.appendChild(frame);
+
+  frame.onload = t.step_func(e => {
+    frame.contentWindow.postMessage({url: url}, '*');
+  });
+
+  self.addEventListener('message', t.step_func(e => {
+    if (e.source !== frame.contentWindow) return;
+    assert_equals(e.data, 'revoked');
+    fetch(url).then(response => response.text()).then(t.step_func_done(text => {
+      assert_equals(text, blob_contents);
+    }), t.unreached_func('Unexpected promise rejection'));
+  }));
+}, 'It is not possible to revoke cross-origin blob URLs.');
+
+</script>
diff --git a/test/wpt/tests/FileAPI/url/multi-global-origin-serialization.sub.html b/test/wpt/tests/FileAPI/url/multi-global-origin-serialization.sub.html
new file mode 100644
index 00000000000..0052b26fa62
--- /dev/null
+++ b/test/wpt/tests/FileAPI/url/multi-global-origin-serialization.sub.html
@@ -0,0 +1,26 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Blob URL serialization (specifically the origin) in multi-global situations</title>
+<link rel="help" href="https://w3c.github.io/FileAPI/#unicodeBlobURL">
+<link rel="author" title="Domenic Denicola" href="mailto:d@domenic.me">
+
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+
+<!-- this page is the entry global -->
+
+<iframe src="//{{domains[www]}}:{{location[port]}}/FileAPI/support/incumbent.sub.html"></iframe>
+
+<script>
+"use strict";
+setup({ single_test: true });
+document.domain = "{{host}}";
+
+window.onload = () => {
+  const url = frames[0].createBlobURL();
+  const desired = "blob:{{location[scheme]}}://www1";
+  assert_equals(url.substring(0, desired.length), desired,
+    "Origin should contain www1, from the current settings object");
+  done();
+};
+</script>
diff --git a/test/wpt/tests/FileAPI/url/resources/create-helper.html b/test/wpt/tests/FileAPI/url/resources/create-helper.html
new file mode 100644
index 00000000000..fa6cf4e671e
--- /dev/null
+++ b/test/wpt/tests/FileAPI/url/resources/create-helper.html
@@ -0,0 +1,7 @@
+<!doctype html>
+<script>
+self.addEventListener('message', e => {
+  let url = URL.createObjectURL(e.data.blob);
+  e.source.postMessage({url: url}, '*');
+});
+</script>
\ No newline at end of file
diff --git a/test/wpt/tests/FileAPI/url/resources/create-helper.js b/test/wpt/tests/FileAPI/url/resources/create-helper.js
new file mode 100644
index 00000000000..e6344f700ce
--- /dev/null
+++ b/test/wpt/tests/FileAPI/url/resources/create-helper.js
@@ -0,0 +1,4 @@
+self.addEventListener('message', e => {
+  let url = URL.createObjectURL(e.data.blob);
+  self.postMessage({url: url});
+});
diff --git a/test/wpt/tests/FileAPI/url/resources/fetch-tests.js b/test/wpt/tests/FileAPI/url/resources/fetch-tests.js
new file mode 100644
index 00000000000..a81ea1e7b1d
--- /dev/null
+++ b/test/wpt/tests/FileAPI/url/resources/fetch-tests.js
@@ -0,0 +1,71 @@
+// This method generates a number of tests verifying fetching of blob URLs,
+// allowing the same tests to be used both with fetch() and XMLHttpRequest.
+//
+// |fetch_method| is only used in test names, and should describe the
+// (javascript) method being used by the other two arguments (i.e. 'fetch' or 'XHR').
+//
+// |fetch_should_succeed| is a callback that is called with the Test and a URL.
+// Fetching the URL is expected to succeed. The callback should return a promise
+// resolved with whatever contents were fetched.
+//
+// |fetch_should_fail| similarly is a callback that is called with the Test, a URL
+// to fetch, and optionally a method to use to do the fetch. If no method is
+// specified the callback should use the 'GET' method. Fetching of these URLs is
+// expected to fail, and the callback should return a promise that resolves iff
+// fetching did indeed fail.
+function fetch_tests(fetch_method, fetch_should_succeed, fetch_should_fail) {
+  const blob_contents = 'test blob contents';
+  const blob = new Blob([blob_contents]);
+
+  promise_test(t => {
+    const url = URL.createObjectURL(blob);
+
+    return fetch_should_succeed(t, url).then(text => {
+      assert_equals(text, blob_contents);
+    });
+  }, 'Blob URLs can be used in ' + fetch_method);
+
+  promise_test(t => {
+    const url = URL.createObjectURL(blob);
+
+    return fetch_should_succeed(t, url + '#fragment').then(text => {
+      assert_equals(text, blob_contents);
+    });
+  }, fetch_method + ' with a fragment should succeed');
+
+  promise_test(t => {
+    const url = URL.createObjectURL(blob);
+    URL.revokeObjectURL(url);
+
+    return fetch_should_fail(t, url);
+  }, fetch_method + ' of a revoked URL should fail');
+
+  promise_test(t => {
+    const url = URL.createObjectURL(blob);
+    URL.revokeObjectURL(url + '#fragment');
+
+    return fetch_should_succeed(t, url).then(text => {
+      assert_equals(text, blob_contents);
+    });
+  }, 'Only exact matches should revoke URLs, using ' + fetch_method);
+
+  promise_test(t => {
+    const url = URL.createObjectURL(blob);
+
+    return fetch_should_fail(t, url + '?querystring');
+  }, 'Appending a query string should cause ' + fetch_method + ' to fail');
+
+  promise_test(t => {
+    const url = URL.createObjectURL(blob);
+
+    return fetch_should_fail(t, url + '/path');
+  }, 'Appending a path should cause ' + fetch_method + ' to fail');
+
+  for (const method of ['HEAD', 'POST', 'DELETE', 'OPTIONS', 'PUT', 'CUSTOM']) {
+    const url = URL.createObjectURL(blob);
+
+    promise_test(t => {
+      return fetch_should_fail(t, url, method);
+    }, fetch_method + ' with method "' + method + '" should fail');
+  }
+}
\ No newline at end of file
diff --git a/test/wpt/tests/FileAPI/url/resources/revoke-helper.html b/test/wpt/tests/FileAPI/url/resources/revoke-helper.html
new file mode 100644
index 00000000000..adf5a014a66
--- /dev/null
+++ b/test/wpt/tests/FileAPI/url/resources/revoke-helper.html
@@ -0,0 +1,7 @@
+<!doctype html>
+<script>
+self.addEventListener('message', e => {
+  URL.revokeObjectURL(e.data.url);
+  e.source.postMessage('revoked', '*');
+});
+</script>
\ No newline at end of file
diff --git a/test/wpt/tests/FileAPI/url/resources/revoke-helper.js b/test/wpt/tests/FileAPI/url/resources/revoke-helper.js
new file mode 100644
index 00000000000..c3e05b64b1a
--- /dev/null
+++ b/test/wpt/tests/FileAPI/url/resources/revoke-helper.js
@@ -0,0 +1,9 @@
+self.addEventListener('message', e => {
+  URL.revokeObjectURL(e.data.url);
+  // Registering a new object URL will make absolutely sure that the revocation
+  // has propagated. Without this at least in chrome it is possible for the
+  // below postMessage to arrive at its destination before the revocation has
+  // been fully processed.
+  URL.createObjectURL(new Blob([]));
+  self.postMessage('revoked');
+});
diff --git a/test/wpt/tests/FileAPI/url/sandboxed-iframe.html b/test/wpt/tests/FileAPI/url/sandboxed-iframe.html
new file mode 100644
index 00000000000..a52939a3eb2
--- /dev/null
+++ b/test/wpt/tests/FileAPI/url/sandboxed-iframe.html
@@ -0,0 +1,32 @@
+<!doctype html>
+<meta charset="utf-8">
+<title>FileAPI Test: Verify behavior of Blob URL in unique origins</title>
+<meta name="timeout" content="long">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+
+<iframe id="sandboxed-iframe" sandbox="allow-scripts"></iframe>
+
+<script>
+
+const iframe_scripts = [
+  'resources/fetch-tests.js',
+  'url-format.any.js',
+  'url-in-tags.window.js',
+  'url-with-xhr.any.js',
+  'url-with-fetch.any.js',
+];
+
+let html = '<!doctype html>\n<meta charset="utf-8">\n<body>\n';
+html = html + '<script src="/resources/testharness.js"></' + 'script>\n';
+html = html + '<script>setup({"explicit_timeout": true});</' + 'script>\n';
+for (const script of iframe_scripts)
+  html = html + '<script src="' + script + '"></' + 'script>\n';
+
+const frame = document.querySelector('#sandboxed-iframe');
+frame.setAttribute('srcdoc', html);
+frame.setAttribute('style', 'display:none;');
+
+fetch_tests_from_window(frame.contentWindow);
+
+</script>
diff --git a/test/wpt/tests/FileAPI/url/unicode-origin.sub.html b/test/wpt/tests/FileAPI/url/unicode-origin.sub.html
new file mode 100644
index 00000000000..2c4921c0344
--- /dev/null
+++ b/test/wpt/tests/FileAPI/url/unicode-origin.sub.html
@@ -0,0 +1,23 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>FileAPI Test: Verify origin of Blob URL</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<body>
+<script>
+async_test(t => {
+  const frame = document.createElement('iframe');
+  self.addEventListener('message', t.step_func(e => {
+      if (e.source != frame.contentWindow) return;
+      const url = e.data.url;
+      assert_false(url.includes('天気の良い日'),
+          'Origin should be ascii rather than unicode');
+      assert_equals(new URL(url).origin, e.origin,
+          'Origin of URL should match origin of frame');
+      assert_true(url.startsWith('blob:{{location[scheme]}}://xn--'));
+      t.done();
+    }));
+  frame.src = '{{location[scheme]}}://{{domains[天気の良い日]}}:{{location[port]}}/FileAPI/support/url-origin.html';
+  document.body.appendChild(frame);
+}, 'Verify serialization of non-ascii origin in Blob URLs');
+</script>
diff --git a/test/wpt/tests/FileAPI/url/url-charset.window.js b/test/wpt/tests/FileAPI/url/url-charset.window.js
new file mode 100644
index 00000000000..777709b64a5
--- /dev/null
+++ b/test/wpt/tests/FileAPI/url/url-charset.window.js
@@ -0,0 +1,34 @@
+async_test(t => {
+  // This could be detected as ISO-2022-JP, in which case there would be no
+  // <textarea>, and thus the script inside would be interpreted as actual
+  // script.
+  const blob = new Blob(
+      [
+        `aaa\u001B$@<textarea>\u001B(B<script>/* xss */<\/script></textarea>bbb`
+      ],
+      {type: 'text/html;charset=utf-8'});
+  const url = URL.createObjectURL(blob);
+  const win = window.open(url);
+  t.add_cleanup(() => {
+    win.close();
+  });
+
+  win.onload = t.step_func_done(() => {
+    assert_equals(win.document.charset, 'UTF-8');
+  });
+}, 'Blob charset should override any auto-detected charset.');
+
+async_test(t => {
+  const blob = new Blob(
+      [`<!doctype html>\n<meta charset="ISO-8859-1">`],
+      {type: 'text/html;charset=utf-8'});
+  const url = URL.createObjectURL(blob);
+  const win = window.open(url);
+  t.add_cleanup(() => {
+    win.close();
+  });
+
+  win.onload = t.step_func_done(() => {
+    assert_equals(win.document.charset, 'UTF-8');
+  });
+}, 'Blob charset should override <meta charset>.');
diff --git a/test/wpt/tests/FileAPI/url/url-format.any.js b/test/wpt/tests/FileAPI/url/url-format.any.js
new file mode 100644
index 00000000000..69c51113e6b
--- /dev/null
+++ b/test/wpt/tests/FileAPI/url/url-format.any.js
@@ -0,0 +1,70 @@
+// META: timeout=long
+const blob = new Blob(['test']);
+const file = new File(['test'], 'name');
+
+test(t => {
+  const url_count = 5000;
+  let list = [];
+
+  t.add_cleanup(() => {
+    for (let url of list) {
+      URL.revokeObjectURL(url);
+    }
+  });
+
+  for (let i = 0; i < url_count; ++i)
+    list.push(URL.createObjectURL(blob));
+
+  list.sort();
+
+  for (let i = 1; i < list.length; ++i)
+    assert_not_equals(list[i], list[i-1], 'generated Blob URLs should be unique');
+}, 'Generated Blob URLs are unique');
+
+test(() => {
+  const url = URL.createObjectURL(blob);
+  assert_equals(typeof url, 'string');
+  assert_true(url.startsWith('blob:'));
+}, 'Blob URL starts with "blob:"');
+
+test(() => {
+  const url = URL.createObjectURL(file);
+  assert_equals(typeof url, 'string');
+  assert_true(url.startsWith('blob:'));
+}, 'Blob URL starts with "blob:" for Files');
+
+test(() => {
+  const url = URL.createObjectURL(blob);
+  assert_equals(new URL(url).origin, location.origin);
+  if (location.origin !== 'null') {
+    assert_true(url.includes(location.origin));
+    assert_true(url.startsWith('blob:' + location.protocol));
+  }
+}, 'Origin of Blob URL matches our origin');
+
+test(() => {
+  const url = URL.createObjectURL(blob);
+  const url_record = new URL(url);
+  assert_equals(url_record.protocol, 'blob:');
+  assert_equals(url_record.origin, location.origin);
+  assert_equals(url_record.host, '', 'host should be an empty string');
+  assert_equals(url_record.port, '', 'port should be an empty string');
+  const uuid_path_re = /\/[0-9a-f]{8}-[0-9a-f]{4}-[1-5][0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}$/i;
+  assert_true(uuid_path_re.test(url_record.pathname), 'Path must end with a valid UUID');
+  if (location.origin !== 'null') {
+    const nested_url = new URL(url_record.pathname);
+    assert_equals(nested_url.origin, location.origin);
+    assert_equals(nested_url.pathname.search(uuid_path_re), 0, 'Path must be a valid UUID');
+    assert_true(url.includes(location.origin));
+    assert_true(url.startsWith('blob:' + location.protocol));
+  }
+}, 'Blob URL parses correctly');
+
+test(() => {
+  const url = URL.createObjectURL(file);
+  assert_equals(new URL(url).origin, location.origin);
+  if (location.origin !== 'null') {
+    assert_true(url.includes(location.origin));
+    assert_true(url.startsWith('blob:' + location.protocol));
+  }
+}, 'Origin of Blob URL matches our origin for Files');
diff --git a/test/wpt/tests/FileAPI/url/url-in-tags-revoke.window.js b/test/wpt/tests/FileAPI/url/url-in-tags-revoke.window.js
new file mode 100644
index 00000000000..1cdad79f7e3
--- /dev/null
+++ b/test/wpt/tests/FileAPI/url/url-in-tags-revoke.window.js
@@ -0,0 +1,115 @@
+// META: timeout=long
+async_test(t => {
+  const run_result = 'test_frame_OK';
+  const blob_contents = '<!doctype html>\n<meta charset="utf-8">\n' +
+    '<script>window.test_result = "' + run_result + '";</script>';
+  const blob = new Blob([blob_contents], {type: 'text/html'});
+  const url = URL.createObjectURL(blob);
+
+  const frame = document.createElement('iframe');
+  frame.setAttribute('src', url);
+  frame.setAttribute('style', 'display:none;');
+  document.body.appendChild(frame);
+  URL.revokeObjectURL(url);
+
+  frame.onload = t.step_func_done(() => {
+    assert_equals(frame.contentWindow.test_result, run_result);
+  });
+}, 'Fetching a blob URL immediately before revoking it works in an iframe.');
+
+async_test(t => {
+  const run_result = 'test_frame_OK';
+  const blob_contents = '<!doctype html>\n<meta charset="utf-8">\n' +
+    '<script>window.test_result = "' + run_result + '";</script>';
+  const blob = new Blob([blob_contents], {type: 'text/html'});
+  const url = URL.createObjectURL(blob);
+
+  const frame = document.createElement('iframe');
+  frame.setAttribute('src', '/common/blank.html');
+  frame.setAttribute('style', 'display:none;');
+  document.body.appendChild(frame);
+
+  frame.onload = t.step_func(() => {
+    frame.contentWindow.location = url;
+    URL.revokeObjectURL(url);
+    frame.onload = t.step_func_done(() => {
+      assert_equals(frame.contentWindow.test_result, run_result);
+    });
+  });
+}, 'Fetching a blob URL immediately before revoking it works in an iframe navigation.');
+
+async_test(t => {
+  const run_result = 'test_frame_OK';
+  const blob_contents = '<!doctype html>\n<meta charset="utf-8">\n' +
+    '<script>window.test_result = "' + run_result + '";</script>';
+  const blob = new Blob([blob_contents], {type: 'text/html'});
+  const url = URL.createObjectURL(blob);
+  const win = window.open(url);
+  URL.revokeObjectURL(url);
+  add_completion_callback(() => { win.close(); });
+
+  win.onload = t.step_func_done(() => {
+    assert_equals(win.test_result, run_result);
+  });
+}, 'Opening a blob URL in a new window immediately before revoking it works.');
+
+function receive_message_on_channel(t, channel_name) {
+  const channel = new BroadcastChannel(channel_name);
+  return new Promise(resolve => {
+    channel.addEventListener('message', t.step_func(e => {
+      resolve(e.data);
+    }));
+  });
+}
+
+function window_contents_for_channel(channel_name) {
+  return '<!doctype html>\n' +
+    '<script>\n' +
+    'new BroadcastChannel("' + channel_name + '").postMessage("foobar");\n' +
+    'self.close();\n' +
+    '</script>';
+}
+
+async_test(t => {
+  const channel_name = 'noopener-window-test';
+  const blob = new Blob([window_contents_for_channel(channel_name)], {type: 'text/html'});
+  receive_message_on_channel(t, channel_name).then(t.step_func_done(t => {
+    assert_equals(t, 'foobar');
+  }));
+  const url = URL.createObjectURL(blob);
+  const win = window.open();
+  win.opener = null;
+  win.location = url;
+  URL.revokeObjectURL(url);
+}, 'Opening a blob URL in a noopener about:blank window immediately before revoking it works.');
+
+async_test(t => {
+  const run_result = 'test_script_OK';
+  const blob_contents = 'window.script_test_result = "' + run_result + '";';
+  const blob = new Blob([blob_contents]);
+  const url = URL.createObjectURL(blob);
+
+  const e = document.createElement('script');
+  e.setAttribute('src', url);
+  e.onload = t.step_func_done(() => {
+    assert_equals(window.script_test_result, run_result);
+  });
+
+  document.body.appendChild(e);
+  URL.revokeObjectURL(url);
+}, 'Fetching a blob URL immediately before revoking it works in <script> tags.');
+
+async_test(t => {
+  const channel_name = 'a-click-test';
+  const blob = new Blob([window_contents_for_channel(channel_name)], {type: 'text/html'});
+  receive_message_on_channel(t, channel_name).then(t.step_func_done(t => {
+    assert_equals(t, 'foobar');
+  }));
+  const url = URL.createObjectURL(blob);
+  const anchor = document.createElement('a');
+  anchor.href = url;
+  anchor.target = '_blank';
+  document.body.appendChild(anchor);
+  anchor.click();
+  URL.revokeObjectURL(url);
+}, 'Opening a blob URL in a new window by clicking an <a> tag works immediately before revoking the URL.');
diff --git a/test/wpt/tests/FileAPI/url/url-in-tags.window.js b/test/wpt/tests/FileAPI/url/url-in-tags.window.js
new file mode 100644
index 00000000000..f20b3599013
--- /dev/null
+++ b/test/wpt/tests/FileAPI/url/url-in-tags.window.js
@@ -0,0 +1,48 @@
+async_test(t => {
+  const run_result = 'test_script_OK';
+  const blob_contents = 'window.test_result = "' + run_result + '";';
+  const blob = new Blob([blob_contents]);
+  const url = URL.createObjectURL(blob);
+
+  const e = document.createElement('script');
+  e.setAttribute('src', url);
+  e.onload = t.step_func_done(() => {
+    assert_equals(window.test_result, run_result);
+  });
+
+  document.body.appendChild(e);
+}, 'Blob URLs can be used in <script> tags');
+
+async_test(t => {
+  const run_result = 'test_frame_OK';
+  const blob_contents = '<!doctype html>\n<meta charset="utf-8">\n' +
+    '<script>window.test_result = "' + run_result + '";</script>';
+  const blob = new Blob([blob_contents], {type: 'text/html'});
+  const url = URL.createObjectURL(blob);
+
+  const frame = document.createElement('iframe');
+  frame.setAttribute('src', url);
+  frame.setAttribute('style', 'display:none;');
+  document.body.appendChild(frame);
+
+  frame.onload = t.step_func_done(() => {
+    assert_equals(frame.contentWindow.test_result, run_result);
+  });
+}, 'Blob URLs can be used in iframes, and are treated same origin');
+
+async_test(t => {
+  const blob_contents = '<!doctype html>\n<meta charset="utf-8">\n' +
+    '<style>body { margin: 0; } .block { height: 5000px; }</style>\n' +
+    '<body>\n' +
+    '<a id="block1"></a><div class="block"></div>\n' +
+    '<a id="block2"></a><div class="block"></div>';
+  const blob = new Blob([blob_contents], {type: 'text/html'});
+  const url = URL.createObjectURL(blob);
+
+  const frame = document.createElement('iframe');
+  frame.setAttribute('src', url + '#block2');
+  document.body.appendChild(frame);
+  frame.contentWindow.onscroll = t.step_func_done(() => {
+    assert_equals(frame.contentWindow.scrollY, 5000);
+  });
+}, 'Blob URL fragment is implemented.');
diff --git a/test/wpt/tests/FileAPI/url/url-lifetime.html b/test/wpt/tests/FileAPI/url/url-lifetime.html
new file mode 100644
index 00000000000..ad5d667193a
--- /dev/null
+++ b/test/wpt/tests/FileAPI/url/url-lifetime.html
@@ -0,0 +1,56 @@
+<!doctype html>
+<meta charset="utf-8">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<body>
+<script>
+promise_test(t => {
+  const blob_contents = 'test blob contents';
+  const blob = new Blob([blob_contents]);
+  const worker = new Worker('resources/create-helper.js');
+  let url;
+  return new Promise(resolve => {
+    worker.onmessage = e => resolve(e.data);
+    worker.postMessage({blob: blob});
+  }).then(data => {
+    url = data.url;
+    let result = fetch(url);
+    worker.terminate();
+    return result;
+  }).then(response => response.text()).then(text => {
+    assert_equals(text, blob_contents);
+    return new Promise(resolve => t.step_timeout(resolve, 100));
+  }).then(() => promise_rejects_js(t, TypeError, fetch(url)));
+}, 'Terminating worker revokes its URLs');
+
+promise_test(t => {
+  const blob_contents = 'test blob contents';
+  const blob = new Blob([blob_contents]);
+  const frame = document.createElement('iframe');
+  frame.setAttribute('style', 'display:none;');
+  frame.src = 'resources/create-helper.html';
+  document.body.appendChild(frame);
+
+  let url;
+  return new Promise(resolve => {
+    frame.onload = t.step_func(e => {
+      resolve(e);
+    });
+  }).then(e => {
+    frame.contentWindow.postMessage({blob: blob}, '*');
+    return new Promise(resolve => {
+      self.addEventListener('message', t.step_func(e => {
+        if (e.source === frame.contentWindow) resolve(e);
+      }));
+    });
+  }).then(e => {
+    url = e.data.url;
+    let fetch_result = fetch(url);
+    document.body.removeChild(frame);
+    return fetch_result;
+  }).then(response => response.text()).then(text => {
+    assert_equals(text, blob_contents);
+    return new Promise(resolve => t.step_timeout(resolve, 100));
+  }).then(() => promise_rejects_js(t, TypeError, fetch(url)));
+}, 'Removing an iframe revokes its URLs');
+</script>
\ No newline at end of file
diff --git a/test/wpt/tests/FileAPI/url/url-reload.window.js b/test/wpt/tests/FileAPI/url/url-reload.window.js
new file mode 100644
index 00000000000..d333b3a74aa
--- /dev/null
+++ b/test/wpt/tests/FileAPI/url/url-reload.window.js
@@ -0,0 +1,36 @@
+function blob_url_reload_test(t, revoke_before_reload) {
+  const run_result = 'test_frame_OK';
+  const blob_contents = '<!doctype html>\n<meta charset="utf-8">\n' +
+    '<script>window.test_result = "' + run_result + '";</script>';
+  const blob = new Blob([blob_contents], {type: 'text/html'});
+  const url = URL.createObjectURL(blob);
+
+  const frame = document.createElement('iframe');
+  frame.setAttribute('src', url);
+  frame.setAttribute('style', 'display:none;');
+  document.body.appendChild(frame);
+
+  frame.onload = t.step_func(() => {
+    if (revoke_before_reload)
+      URL.revokeObjectURL(url);
+    assert_equals(frame.contentWindow.test_result, run_result);
+    frame.contentWindow.test_result = null;
+    frame.onload = t.step_func_done(() => {
+      assert_equals(frame.contentWindow.test_result, run_result);
+    });
+    // Slight delay before reloading to ensure revoke actually has had a chance
+    // to be processed.
+    t.step_timeout(() => {
+      frame.contentWindow.location.reload();
+    }, 250);
+  });
+}
+
+async_test(t => {
+  blob_url_reload_test(t, false);
+}, 'Reloading a blob URL succeeds.');
+
+
+async_test(t => {
+  blob_url_reload_test(t, true);
+}, 'Reloading a blob URL succeeds even if the URL was revoked.');
diff --git a/test/wpt/tests/FileAPI/url/url-with-fetch.any.js b/test/wpt/tests/FileAPI/url/url-with-fetch.any.js
new file mode 100644
index 00000000000..54e6a3da5af
--- /dev/null
+++ b/test/wpt/tests/FileAPI/url/url-with-fetch.any.js
@@ -0,0 +1,72 @@
+// META: script=resources/fetch-tests.js
+// META: script=/common/gc.js
+
+function fetch_should_succeed(test, request) {
+  return fetch(request).then(response => response.text());
+}
+
+function fetch_should_fail(test, url, method = 'GET') {
+  return promise_rejects_js(test, TypeError, fetch(url, {method: method}));
+}
+
+fetch_tests('fetch', fetch_should_succeed, fetch_should_fail);
+
+promise_test(t => {
+  const blob_contents = 'test blob contents';
+  const blob_type = 'image/png';
+  const blob = new Blob([blob_contents], {type: blob_type});
+  const url = URL.createObjectURL(blob);
+
+  return fetch(url).then(response => {
+    assert_equals(response.headers.get('Content-Type'), blob_type);
+  });
+}, 'fetch should return Content-Type from Blob');
+
+promise_test(t => {
+  const blob_contents = 'test blob contents';
+  const blob = new Blob([blob_contents]);
+  const url = URL.createObjectURL(blob);
+  const request = new Request(url);
+
+  // Revoke the object URL.  Request should take a reference to the blob as
+  // soon as it receives it in open(), so the request succeeds even though we
+  // revoke the URL before calling fetch().
+  URL.revokeObjectURL(url);
+
+  return fetch_should_succeed(t, request).then(text => {
+    assert_equals(text, blob_contents);
+  });
+}, 'Revoke blob URL after creating Request, will fetch');
+
+promise_test(async t => {
+  const blob_contents = 'test blob contents';
+  const blob = new Blob([blob_contents]);
+  const url = URL.createObjectURL(blob);
+  let request = new Request(url);
+
+  // Revoke the object URL.  Request should take a reference to the blob as
+  // soon as it receives it in open(), so the request succeeds even though we
+  // revoke the URL before calling fetch().
+  URL.revokeObjectURL(url);
+
+  request = request.clone();
+  await garbageCollect();
+
+  const text = await fetch_should_succeed(t, request);
+  assert_equals(text, blob_contents);
+}, 'Revoke blob URL after creating Request, then clone Request, will fetch');
+
+promise_test(function(t) {
+  const blob_contents = 'test blob contents';
+  const blob = new Blob([blob_contents]);
+  const url = URL.createObjectURL(blob);
+
+  const result = fetch_should_succeed(t, url).then(text => {
+    assert_equals(text, blob_contents);
+  });
+
+  // Revoke the object URL. fetch should have already resolved the blob URL.
+  URL.revokeObjectURL(url);
+
+  return result;
+}, 'Revoke blob URL after calling fetch, fetch should succeed');
diff --git a/test/wpt/tests/FileAPI/url/url-with-xhr.any.js b/test/wpt/tests/FileAPI/url/url-with-xhr.any.js
new file mode 100644
index 00000000000..29d83080ab5
--- /dev/null
+++ b/test/wpt/tests/FileAPI/url/url-with-xhr.any.js
@@ -0,0 +1,68 @@
+// META: script=resources/fetch-tests.js
+
+function xhr_should_succeed(test, url) {
+  return new Promise((resolve, reject) => {
+    const xhr = new XMLHttpRequest();
+    xhr.open('GET', url);
+    xhr.onload = test.step_func(() => {
+      assert_equals(xhr.status, 200);
+      assert_equals(xhr.statusText, 'OK');
+      resolve(xhr.response);
+    });
+    xhr.onerror = () => reject('Got unexpected error event');
+    xhr.send();
+  });
+}
+
+function xhr_should_fail(test, url, method = 'GET') {
+  const xhr = new XMLHttpRequest();
+  xhr.open(method, url);
+  const result1 = new Promise((resolve, reject) => {
+    xhr.onload = () => reject('Got unexpected load event');
+    xhr.onerror = resolve;
+  });
+  const result2 = new Promise(resolve => {
+    xhr.onreadystatechange = test.step_func(() => {
+      if (xhr.readyState !== xhr.DONE) return;
+      assert_equals(xhr.status, 0);
+      resolve();
+    });
+  });
+  xhr.send();
+  return Promise.all([result1, result2]);
+}
+
+fetch_tests('XHR', xhr_should_succeed, xhr_should_fail);
+
+async_test(t => {
+  const blob_contents = 'test blob contents';
+  const blob_type = 'image/png';
+  const blob = new Blob([blob_contents], {type: blob_type});
+  const url = URL.createObjectURL(blob);
+  const xhr = new XMLHttpRequest();
+  xhr.open('GET', url);
+  xhr.onloadend = t.step_func_done(() => {
+    assert_equals(xhr.getResponseHeader('Content-Type'), blob_type);
+  });
+  xhr.send();
+}, 'XHR should return Content-Type from Blob');
+
+async_test(t => {
+  const blob_contents = 'test blob contents';
+  const blob = new Blob([blob_contents]);
+  const url = URL.createObjectURL(blob);
+  const xhr = new XMLHttpRequest();
+  xhr.open('GET', url);
+
+  // Revoke the object URL.  XHR should take a reference to the blob as soon as
+  // it receives it in open(), so the request succeeds even though we revoke the
+  // URL before calling send().
+  URL.revokeObjectURL(url);
+
+  xhr.onload = t.step_func_done(() => {
+    assert_equals(xhr.response, blob_contents);
+  });
+  xhr.onerror = t.unreached_func('Got unexpected error event');
+
+  xhr.send();
+}, 'Revoke blob URL after open(), will fetch');
diff --git a/test/wpt/tests/FileAPI/url/url_createobjecturl_file-manual.html b/test/wpt/tests/FileAPI/url/url_createobjecturl_file-manual.html
new file mode 100644
index 00000000000..7ae32512e07
--- /dev/null
+++ b/test/wpt/tests/FileAPI/url/url_createobjecturl_file-manual.html
@@ -0,0 +1,45 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>FileAPI Test: Creating Blob URL with File</title>
+<link rel="author" title="Intel" href="http://www.intel.com">
+<link rel="author" title="JunChen Xia" href="mailto:xjconlyme@gmail.com">
+<meta name="timeout" content="long">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+
+<div>
+  <p>Test steps:</p>
+  <ol>
+    <li>Download <a href="/images/blue96x96.png">blue96x96.png</a> to local.</li>
+    <li>Select the local file (blue96x96.png) to run the test.</li>
+  </ol>
+</div>
+
+<form name="uploadData">
+  <input type="file" id="fileChooser">
+</form>
+
+<div id="log"></div>
+
+<script>
+  async_test(function(t) {
+    var fileInput = document.querySelector('#fileChooser');
+
+    fileInput.onchange = t.step_func(function(e) {
+      var blobURL, file = fileInput.files[0];
+
+      test(function() {
+        assert_true(file instanceof File, "FileList contains File");
+      }, "Check if FileList contains File");
+
+      test(function() {
+        blobURL = window.URL.createObjectURL(file);
+        assert_equals(typeof blobURL, "string", "Blob URL is type of string");
+        assert_equals(blobURL.indexOf("blob"), 0, "Blob URL's scheme is blob");
+      }, "Check if URL.createObjectURL(File) returns a Blob URL");
+
+      t.done();
+    });
+  });
+</script>
+
diff --git a/test/wpt/tests/FileAPI/url/url_createobjecturl_file_img-manual.html b/test/wpt/tests/FileAPI/url/url_createobjecturl_file_img-manual.html
new file mode 100644
index 00000000000..534c1de9968
--- /dev/null
+++ b/test/wpt/tests/FileAPI/url/url_createobjecturl_file_img-manual.html
@@ -0,0 +1,28 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>FileAPI Test: Creating Blob URL with File as image source</title>
+<link rel="author" title="Intel" href="http://www.intel.com">
+<link rel="author" title="JunChen Xia" href="mailto:xjconlyme@gmail.com">
+
+<div>
+  <p>Test steps:</p>
+  <ol>
+    <li>Download <a href="/images/blue96x96.png">blue96x96.png</a> to local.</li>
+    <li>Select the local file (blue96x96.png) to run the test.</li>
+  </ol>
+  <p>Pass/fail criteria:</p>
+  <p>Test passes if there is a filled blue square.</p>
+
+  <p><input type="file" accept="image/*" id="fileChooser"></p>
+  <p><img id="displayImage"></img></p>
+</div>
+
+<script>
+  var fileInput = document.querySelector("#fileChooser");
+  var img = document.querySelector("#displayImage");
+
+  fileInput.addEventListener("change", function(evt) {
+    img.src = window.URL.createObjectURL(fileInput.files[0]);
+  }, false);
+</script>
+
diff --git a/test/wpt/tests/FileAPI/url/url_xmlhttprequest_img-ref.html b/test/wpt/tests/FileAPI/url/url_xmlhttprequest_img-ref.html
new file mode 100644
index 00000000000..7d7390442d3
--- /dev/null
+++ b/test/wpt/tests/FileAPI/url/url_xmlhttprequest_img-ref.html
@@ -0,0 +1,12 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>FileAPI Reference File</title>
+<link rel="author" title="Intel" href="http://www.intel.com">
+<link rel="author" title="JunChen Xia" href="mailto:xjconlyme@gmail.com">
+
+<p>Test passes if there is a filled blue square.</p>
+
+<p>
+  <img id="fileDisplay" src="/images/blue96x96.png">
+</p>
+
diff --git a/test/wpt/tests/FileAPI/url/url_xmlhttprequest_img.html b/test/wpt/tests/FileAPI/url/url_xmlhttprequest_img.html
new file mode 100644
index 00000000000..468dcb086d7
--- /dev/null
+++ b/test/wpt/tests/FileAPI/url/url_xmlhttprequest_img.html
@@ -0,0 +1,27 @@
+<!DOCTYPE html>
+<html class="reftest-wait">
+<meta charset="utf-8">
+<title>FileAPI Test: Creating Blob URL via XMLHttpRequest as image source</title>
+<link rel="author" title="Intel" href="http://www.intel.com">
+<link rel="author" title="JunChen Xia" href="mailto:xjconlyme@gmail.com">
+<link rel="match" href="url_xmlhttprequest_img-ref.html">
+
+<p>Test passes if there is a filled blue square.</p>
+
+<p>
+  <img id="fileDisplay">
+</p>
+
+<script src="/common/reftest-wait.js"></script>
+<script>
+  var http = new XMLHttpRequest();
+  http.open("GET", "/images/blue96x96.png", true);
+  http.responseType = "blob";
+  http.onloadend = function() {
+    var fileDisplay = document.querySelector("#fileDisplay");
+    fileDisplay.src = window.URL.createObjectURL(http.response);
+    fileDisplay.onload = takeScreenshot;
+  };
+  http.send();
+</script>
+</html>
diff --git a/test/wpt/tests/README.md b/test/wpt/tests/README.md
new file mode 100644
index 00000000000..7e8e9948091
--- /dev/null
+++ b/test/wpt/tests/README.md
@@ -0,0 +1,124 @@
+The web-platform-tests Project
+==============================
+
+[![Taskcluster CI Status](https://community-tc.services.mozilla.com/api/github/v1/repository/web-platform-tests/wpt/master/badge.svg)](https://community-tc.services.mozilla.com/api/github/v1/repository/web-platform-tests/wpt/master/latest) [![documentation](https://github.com/web-platform-tests/wpt/workflows/documentation/badge.svg)](https://github.com/web-platform-tests/wpt/actions?query=workflow%3Adocumentation+branch%3Amaster) [![manifest](https://github.com/web-platform-tests/wpt/workflows/manifest/badge.svg)](https://github.com/web-platform-tests/wpt/actions?query=workflow%3Amanifest+branch%3Amaster) [![Python 3](https://pyup.io/repos/github/web-platform-tests/wpt/python-3-shield.svg)](https://pyup.io/repos/github/web-platform-tests/wpt/)
+
+The web-platform-tests Project is a cross-browser test suite for the
+Web-platform stack. Writing tests in a way that allows them to be run in all
+browsers gives browser projects confidence that they are shipping software that
+is compatible with other implementations, and that later implementations will
+be compatible with their implementations. This in turn gives Web
+authors/developers confidence that they can actually rely on the Web platform
+to deliver on the promise of working across browsers and devices without
+needing extra layers of abstraction to paper over the gaps left by
+specification editors and implementors.
+
+The most important sources of information and activity are:
+
+- [github.com/web-platform-tests/wpt](https://github.com/web-platform-tests/wpt):
+  the canonical location of the project's source code revision history and the
+  discussion forum for changes to the code
+- [web-platform-tests.org](https://web-platform-tests.org): the documentation
+  website; details how to set up the project, how to write tests, how to give
+  and receive peer review, how to serve as an administrator, and more
+- [wpt.live](https://wpt.live): a public deployment of the test suite,
+  allowing anyone to run the tests by visiting from an
+  Internet-enabled browser of their choice
+- [wpt.fyi](https://wpt.fyi): an archive of test results collected from an
+  array of web browsers on a regular basis
+- [Real-time chat room](https://app.element.io/#/room/#wpt:matrix.org): the
+  `wpt:matrix.org` matrix channel; includes participants located
+  around the world, but busiest during the European working day.
+- [Mailing list](https://lists.w3.org/Archives/Public/public-test-infra/): a
+  public and low-traffic discussion list
+- [RFCs](https://github.com/web-platform-tests/rfcs): a repo for requesting
+  comments on substantial changes that would impact other stakeholders or
+  users; people who work on WPT infra are encouraged to watch the repo.
+
+**If you'd like clarification about anything**, don't hesitate to ask in the
+chat room or on the mailing list.
+
+Setting Up the Repo
+===================
+
+Clone or otherwise get https://github.com/web-platform-tests/wpt.
+
+Note: because of the frequent creation and deletion of branches in this
+repo, it is recommended to "prune" stale branches when fetching updates,
+i.e. use `git pull --prune` (or `git fetch -p && git merge`).
+
+Running the Tests
+=================
+
+See the [documentation website](https://web-platform-tests.org/running-tests/)
+and in particular the
+[system setup for running tests locally](https://web-platform-tests.org/running-tests/from-local-system.html#system-setup).
+
+Command Line Tools
+==================
+
+The `wpt` command provides a frontend to a variety of tools for
+working with and running web-platform-tests. Some of the most useful
+commands are:
+
+* `wpt serve` - For starting the wpt http server
+* `wpt run` - For running tests in a browser
+* `wpt lint` - For running the lint against all tests
+* `wpt manifest` - For updating or generating a `MANIFEST.json` test manifest
+* `wpt install` - For installing the latest release of a browser or
+  webdriver server on the local machine.
+* `wpt serve-wave` - For starting the wpt http server and the WAVE test runner.
+For more details on how to use the WAVE test runner see the [documentation](./tools/wave/docs/usage/usage.md).
+
+<span id="windows-notes">Windows Notes</span>
+=============================================
+
+On Windows `wpt` commands must be prefixed with `python` or the path
+to the python binary (if `python` is not in your `%PATH%`).
+
+```bash
+python wpt [command]
+```
+
+Alternatively, you may also use
+[Bash on Ubuntu on Windows](https://msdn.microsoft.com/en-us/commandline/wsl/about)
+in the Windows 10 Anniversary Update build, then access your windows
+partition from there to launch `wpt` commands.
+
+Please make sure git and your text editor do not automatically convert
+line endings, as it will cause lint errors. For git, please set
+`git config core.autocrlf false` in your working tree.
+
+Publication
+===========
+
+The master branch is automatically synced to [wpt.live](https://wpt.live/) and
+[w3c-test.org](https://w3c-test.org/).
+
+Contributing
+============
+
+Save the Web, Write Some Tests!
+
+Absolutely everyone is welcome to contribute to test development. No
+test is too small or too simple, especially if it corresponds to
+something for which you've noted an interoperability bug in a browser.
+
+The way to contribute is just as usual:
+
+* Fork this repository (and make sure you're still relatively in sync
+  with it if you forked a while ago).
+* Create a branch for your changes:
+  `git checkout -b topic`.
+* Make your changes.
+* Run `./wpt lint` as described above.
+* Commit locally and push that to your repo.
+* Create a pull request based on the above.
+
+Issues with web-platform-tests
+------------------------------
+
+If you spot an issue with a test and are not comfortable providing a
+pull request per above to fix it, please
+[file a new issue](https://github.com/web-platform-tests/wpt/issues/new).
+Thank you!
diff --git a/test/wpt/tests/common/CustomCorsResponse.py b/test/wpt/tests/common/CustomCorsResponse.py
new file mode 100644
index 00000000000..fc4d122f1b1
--- /dev/null
+++ b/test/wpt/tests/common/CustomCorsResponse.py
@@ -0,0 +1,30 @@
+import json
+
+def main(request, response):
+  '''Handler for getting an HTTP response customised by the given query
+  parameters.
+
+  The returned response will have
+    - HTTP headers defined by the 'headers' query parameter
+      - Must be a serialized JSON dictionary mapping header names to header
+        values
+    - HTTP status code defined by the 'status' query parameter
+      - Must be a positive serialized JSON integer like the string '200'
+    - Response content defined by the 'content' query parameter
+      - Must be a serialized JSON string representing the desired response body
+  '''
+  def query_parameter_or_default(param, default):
+    return request.GET.first(param) if param in request.GET else default
+
+  headers = json.loads(query_parameter_or_default(b'headers', b'"{}"'))
+  for k, v in headers.items():
+    response.headers.set(k, v)
+
+  # Note that, in order to have out-of-the-box support for tests that don't call
+  #   setup({'allow_uncaught_exception': true})
+  # we return a no-op JS payload. This approach will avoid syntax errors in
+  # script resources that would otherwise cause the test harness to fail.
+  response.content = json.loads(query_parameter_or_default(b'content',
+    b'"/* CustomCorsResponse.py content */"'))
+  response.status_code = json.loads(query_parameter_or_default(b'status',
+    b'200'))
diff --git a/test/wpt/tests/common/META.yml b/test/wpt/tests/common/META.yml
new file mode 100644
index 00000000000..ca4d2e523c0
--- /dev/null
+++ b/test/wpt/tests/common/META.yml
@@ -0,0 +1,3 @@
+suggested_reviewers:
+  - zqzhang
+  - deniak
diff --git a/test/wpt/tests/common/PrefixedLocalStorage.js b/test/wpt/tests/common/PrefixedLocalStorage.js
new file mode 100644
index 00000000000..2f4e7b6a055
--- /dev/null
+++ b/test/wpt/tests/common/PrefixedLocalStorage.js
@@ -0,0 +1,116 @@
+/**
+ * Supports pseudo-"namespacing" localStorage for a given test
+ * by generating and using a unique prefix for keys. Why trounce on other
+ * tests' localStorage items when you can keep it "separated"?
+ *
+ * PrefixedLocalStorageTest: Instantiate in testharness.js tests to generate
+ *   a new unique-ish prefix
+ * PrefixedLocalStorageResource: Instantiate in supporting test resource
+ *   files to use/share a prefix generated by a test.
+ */
+var PrefixedLocalStorage = function () {
+  this.prefix = ''; // Prefix for localStorage keys
+  this.param = 'prefixedLocalStorage'; // Param to use in querystrings
+};
+
+PrefixedLocalStorage.prototype.clear = function () {
+  if (this.prefix === '') { return; }
+  Object.keys(localStorage).forEach(sKey => {
+    if (sKey.indexOf(this.prefix) === 0) {
+      localStorage.removeItem(sKey);
+    }
+  });
+};
+
+/**
+ * Append/replace prefix parameter and value in URI querystring
+ * Use to generate URLs to resource files that will share the prefix.
+ */
+PrefixedLocalStorage.prototype.url = function (uri) {
+  function updateUrlParameter (uri, key, value) {
+    var i         = uri.indexOf('#');
+    var hash      = (i === -1) ? '' : uri.substr(i);
+    uri           = (i === -1) ? uri : uri.substr(0, i);
+    var re        = new RegExp(`([?&])${key}=.*?(&|$)`, 'i');
+    var separator = uri.indexOf('?') !== -1 ? '&' : '?';
+    uri = (uri.match(re)) ? uri.replace(re, `$1${key}=${value}$2`) :
+      `${uri}${separator}${key}=${value}`;
+    return uri + hash;
+  }
+  return updateUrlParameter(uri, this.param, this.prefix);
+};
+
+PrefixedLocalStorage.prototype.prefixedKey = function (baseKey) {
+  return `${this.prefix}${baseKey}`;
+};
+
+PrefixedLocalStorage.prototype.setItem = function (baseKey, value) {
+  localStorage.setItem(this.prefixedKey(baseKey), value);
+};
+
+/**
+ * Listen for `storage` events pertaining to a particular key,
+ * prefixed with this object's prefix. Ignore when value is being set to null
+ * (i.e. removeItem).
+ */
+PrefixedLocalStorage.prototype.onSet = function (baseKey, fn) {
+  window.addEventListener('storage', e => {
+    var match = this.prefixedKey(baseKey);
+    if (e.newValue !== null && e.key.indexOf(match) === 0) {
+      fn.call(this, e);
+    }
+  });
+};
+
+/*****************************************************************************
+ * Use in a testharnessjs test to generate a new key prefix.
+ * async_test(t => {
+ *   var prefixedStorage = new PrefixedLocalStorageTest();
+ *   t.add_cleanup(() => prefixedStorage.cleanup());
+ *   /...
+ * });
+ */
+var PrefixedLocalStorageTest = function () {
+  PrefixedLocalStorage.call(this);
+  this.prefix = `${document.location.pathname}-${Math.random()}-${Date.now()}-`;
+};
+PrefixedLocalStorageTest.prototype = Object.create(PrefixedLocalStorage.prototype);
+PrefixedLocalStorageTest.prototype.constructor = PrefixedLocalStorageTest;
+
+/**
+ * Use in a cleanup function to clear out prefixed entries in localStorage
+ */
+PrefixedLocalStorageTest.prototype.cleanup = function () {
+  this.setItem('closeAll', 'true');
+  this.clear();
+};
+
+/*****************************************************************************
+ * Use in test resource files to share a prefix generated by a
+ * PrefixedLocalStorageTest. Will look in URL querystring for prefix.
+ * Setting `close_on_cleanup` opt truthy will make this script's window listen
+ * for storage `closeAll` event from controlling test and close itself.
+ *
+ * var PrefixedLocalStorageResource({ close_on_cleanup: true });
+ */
+var PrefixedLocalStorageResource = function (options) {
+  PrefixedLocalStorage.call(this);
+  this.options = Object.assign({}, {
+    close_on_cleanup: false
+  }, options || {});
+  // Check URL querystring for prefix to use
+  var regex = new RegExp(`[?&]${this.param}(=([^&#]*)|&|#|$)`),
+    results = regex.exec(document.location.href);
+  if (results && results[2]) {
+    this.prefix = results[2];
+  }
+  // Optionally have this window close itself when the PrefixedLocalStorageTest
+  // sets a `closeAll` item.
+  if (this.options.close_on_cleanup) {
+    this.onSet('closeAll', () => {
+      window.close();
+    });
+  }
+};
+PrefixedLocalStorageResource.prototype = Object.create(PrefixedLocalStorage.prototype);
+PrefixedLocalStorageResource.prototype.constructor = PrefixedLocalStorageResource;
diff --git a/test/wpt/tests/common/PrefixedLocalStorage.js.headers b/test/wpt/tests/common/PrefixedLocalStorage.js.headers
new file mode 100644
index 00000000000..6805c323df5
--- /dev/null
+++ b/test/wpt/tests/common/PrefixedLocalStorage.js.headers
@@ -0,0 +1 @@
+Content-Type: text/javascript; charset=utf-8
diff --git a/test/wpt/tests/common/PrefixedPostMessage.js b/test/wpt/tests/common/PrefixedPostMessage.js
new file mode 100644
index 00000000000..674b52877c0
--- /dev/null
+++ b/test/wpt/tests/common/PrefixedPostMessage.js
@@ -0,0 +1,100 @@
+/**
+ * Supports pseudo-"namespacing" for window-posted messages for a given test
+ * by generating and using a unique prefix that gets wrapped into message
+ * objects. This makes it more feasible to have multiple tests that use
+ * `window.postMessage` in a single test file. Basically, make it possible
+ * for the each test to listen for only the messages that are pertinent to it.
+ *
+ * 'Prefix' not an elegant term to use here but this models itself after
+ * PrefixedLocalStorage.
+ *
+ * PrefixedMessageTest: Instantiate in testharness.js tests to generate
+ *   a new unique-ish prefix that can be used by other test support files
+ * PrefixedMessageResource: Instantiate in supporting test resource
+ *   files to use/share a prefix generated by a test.
+ */
+var PrefixedMessage = function () {
+  this.prefix = '';
+  this.param = 'prefixedMessage'; // Param to use in querystrings
+};
+
+/**
+ * Generate a URL that adds/replaces param with this object's prefix
+ * Use to link to test support files that make use of
+ * PrefixedMessageResource.
+ */
+PrefixedMessage.prototype.url = function (uri) {
+  function updateUrlParameter (uri, key, value) {
+    var i         = uri.indexOf('#');
+    var hash      = (i === -1) ? '' : uri.substr(i);
+    uri           = (i === -1) ? uri : uri.substr(0, i);
+    var re        = new RegExp(`([?&])${key}=.*?(&|$)`, 'i');
+    var separator = uri.indexOf('?') !== -1 ? '&' : '?';
+    uri = (uri.match(re)) ? uri.replace(re, `$1${key}=${value}$2`) :
+      `${uri}${separator}${key}=${value}`;
+    return uri + hash;
+  }
+  return updateUrlParameter(uri, this.param, this.prefix);
+};
+
+/**
+ * Add an eventListener on `message` but only invoke the given callback
+ * for messages whose object contains this object's prefix. Remove the
+ * event listener once the anticipated message has been received.
+ */
+PrefixedMessage.prototype.onMessage = function (fn) {
+  window.addEventListener('message', e => {
+    if (typeof e.data === 'object' && e.data.hasOwnProperty('prefix')) {
+      if (e.data.prefix === this.prefix) {
+        // Only invoke callback when `data` is an object containing
+        // a `prefix` key with this object's prefix value
+        // Note fn is invoked with "unwrapped" data first, then the event `e`
+        // (which contains the full, wrapped e.data should it be needed)
+        fn.call(this, e.data.data, e);
+        window.removeEventListener('message', fn);
+      }
+    }
+  });
+};
+
+/**
+ * Instantiate in a test file (e.g. during `setup`) to create a unique-ish
+ * prefix that can be shared by support files
+ */
+var PrefixedMessageTest = function () {
+  PrefixedMessage.call(this);
+  this.prefix = `${document.location.pathname}-${Math.random()}-${Date.now()}-`;
+};
+PrefixedMessageTest.prototype = Object.create(PrefixedMessage.prototype);
+PrefixedMessageTest.prototype.constructor = PrefixedMessageTest;
+
+/**
+ * Instantiate in a test support script to use a "prefix" generated by a
+ * PrefixedMessageTest in a controlling test file. It will look for
+ * the prefix in a URL param (see also PrefixedMessage#url)
+ */
+var PrefixedMessageResource = function () {
+  PrefixedMessage.call(this);
+  // Check URL querystring for prefix to use
+  var regex = new RegExp(`[?&]${this.param}(=([^&#]*)|&|#|$)`),
+    results = regex.exec(document.location.href);
+  if (results && results[2]) {
+    this.prefix = results[2];
+  }
+};
+PrefixedMessageResource.prototype = Object.create(PrefixedMessage.prototype);
+PrefixedMessageResource.prototype.constructor = PrefixedMessageResource;
+
+/**
+ * This is how a test resource document can "send info" to its
+ * opener context. It will whatever message is being sent (`data`) in
+ * an object that injects the prefix.
+ */
+PrefixedMessageResource.prototype.postToOpener = function (data) {
+  if (window.opener) {
+    window.opener.postMessage({
+      prefix: this.prefix,
+      data: data
+    }, '*');
+  }
+};
diff --git a/test/wpt/tests/common/PrefixedPostMessage.js.headers b/test/wpt/tests/common/PrefixedPostMessage.js.headers
new file mode 100644
index 00000000000..6805c323df5
--- /dev/null
+++ b/test/wpt/tests/common/PrefixedPostMessage.js.headers
@@ -0,0 +1 @@
+Content-Type: text/javascript; charset=utf-8
diff --git a/test/wpt/tests/common/README.md b/test/wpt/tests/common/README.md
new file mode 100644
index 00000000000..9aef19cb73f
--- /dev/null
+++ b/test/wpt/tests/common/README.md
@@ -0,0 +1,10 @@
+The files in this directory are non-infrastructure support files that can be used by tests.
+
+* `blank.html` - An empty HTML document.
+* `domain-setter.sub.html` - An HTML document that sets `document.domain`.
+* `dummy.xhtml` - An XHTML document.
+* `dummy.xml` - An XML document.
+* `text-plain.txt` - A text/plain document.
+* `*.js` - Utility scripts. These are documented in the source.
+* `*.py` - wptserve [Python Handlers](https://web-platform-tests.org/writing-tests/python-handlers/). These are documented in the source.
+* `security-features` - Documented in `security-features/README.md`.
diff --git a/test/wpt/tests/common/__init__.py b/test/wpt/tests/common/__init__.py
new file mode 100644
index 00000000000..e69de29bb2d
diff --git a/test/wpt/tests/common/arrays.js b/test/wpt/tests/common/arrays.js
new file mode 100644
index 00000000000..2b31bb4179c
--- /dev/null
+++ b/test/wpt/tests/common/arrays.js
@@ -0,0 +1,31 @@
+/**
+ * Callback for checking equality of c and d.
+ *
+ * @callback equalityCallback
+ * @param {*} c
+ * @param {*} d
+ * @returns {boolean}
+ */
+
+/**
+ * Returns true if the given arrays are equal. Optionally can pass an equality function.
+ * @param {Array} a
+ * @param {Array} b
+ * @param {equalityCallback} callbackFunction - defaults to `c === d`
+ * @returns {boolean}
+ */
+export function areArraysEqual(a, b, equalityFunction = (c, d) => { return c === d; }) {
+  try {
+    if (a.length !== b.length)
+      return false;
+
+    for (let i = 0; i < a.length; i++) {
+      if (!equalityFunction(a[i], b[i]))
+        return false;
+    }
+  } catch (ex) {
+    return false;
+  }
+
+  return true;
+}
diff --git a/test/wpt/tests/common/blank-with-cors.html b/test/wpt/tests/common/blank-with-cors.html
new file mode 100644
index 00000000000..e69de29bb2d
diff --git a/test/wpt/tests/common/blank-with-cors.html.headers b/test/wpt/tests/common/blank-with-cors.html.headers
new file mode 100644
index 00000000000..cb762eff806
--- /dev/null
+++ b/test/wpt/tests/common/blank-with-cors.html.headers
@@ -0,0 +1 @@
+Access-Control-Allow-Origin: *
diff --git a/test/wpt/tests/common/blank.html b/test/wpt/tests/common/blank.html
new file mode 100644
index 00000000000..e69de29bb2d
diff --git a/test/wpt/tests/common/custom-cors-response.js b/test/wpt/tests/common/custom-cors-response.js
new file mode 100644
index 00000000000..be9c7ce3bdc
--- /dev/null
+++ b/test/wpt/tests/common/custom-cors-response.js
@@ -0,0 +1,32 @@
+const custom_cors_response = (payload, base_url) => {
+  base_url = base_url || new URL(location.href);
+
+  // Clone the given `payload` so that, as we modify it, we won't be mutating
+  // the caller's value in unexpected ways.
+  payload = Object.assign({}, payload);
+  payload.headers = payload.headers || {};
+  // Note that, in order to have out-of-the-box support for tests that don't
+  // call `setup({'allow_uncaught_exception': true})` we return a no-op JS
+  // payload. This approach will avoid hitting syntax errors if the resource is
+  // interpreted as script. Without this workaround, the SyntaxError would be
+  // caught by the test harness and trigger a test failure.
+  payload.content = payload.content || '/* custom-cors-response.js content */';
+  payload.status_code = payload.status_code || 200;
+
+  // Assume that we'll be doing a CORS-enabled fetch so we'll need to set ACAO.
+  const acao = "Access-Control-Allow-Origin";
+  if (!(acao in payload.headers)) {
+    payload.headers[acao] = '*';
+  }
+
+  if (!("Content-Type" in payload.headers)) {
+    payload.headers["Content-Type"] = "text/javascript";
+  }
+
+  let ret = new URL("/common/CustomCorsResponse.py", base_url);
+  for (const key in payload) {
+    ret.searchParams.append(key, JSON.stringify(payload[key]));
+  }
+
+  return ret;
+};
diff --git a/test/wpt/tests/common/dispatcher/README.md b/test/wpt/tests/common/dispatcher/README.md
new file mode 100644
index 00000000000..cfaafb6e5d6
--- /dev/null
+++ b/test/wpt/tests/common/dispatcher/README.md
@@ -0,0 +1,228 @@
+# `RemoteContext`: API for script execution in another context
+
+`RemoteContext` in `/common/dispatcher/dispatcher.js` provides an interface to
+execute JavaScript in another global object (page or worker, the "executor"),
+based on:
+
+- [WPT RFC 88: context IDs from uuid searchParams in URL](https://github.com/web-platform-tests/rfcs/pull/88),
+- [WPT RFC 89: execute_script](https://github.com/web-platform-tests/rfcs/pull/89) and
+- [WPT RFC 91: RemoteContext](https://github.com/web-platform-tests/rfcs/pull/91).
+
+Tests can send arbitrary javascript to executors to evaluate in its global
+object, like:
+
+```
+// injector.html
+const argOnLocalContext = ...;
+
+async function execute() {
+  window.open('executor.html?uuid=' + uuid);
+  const ctx = new RemoteContext(uuid);
+  await ctx.execute_script(
+      (arg) => functionOnRemoteContext(arg),
+      [argOnLocalContext]);
+};
+```
+
+and on executor:
+
+```
+// executor.html
+function functionOnRemoteContext(arg) { ... }
+
+const uuid = new URLSearchParams(window.location.search).get('uuid');
+const executor = new Executor(uuid);
+```
+
+For concrete examples, see
+[events.html](../../html/browsers/browsing-the-web/back-forward-cache/events.html)
+and
+[executor.html](../../html/browsers/browsing-the-web/back-forward-cache/resources/executor.html)
+in back-forward cache tests.
+
+Note that `executor*` files under `/common/dispatcher/` are NOT for
+`RemoteContext.execute_script()`. Use `remote-executor.html` instead.
+
+This is universal and avoids introducing many specific `XXX-helper.html`
+resources.
+Moreover, tests are easier to read, because the whole logic of the test can be
+defined in a single file.
+
+## `new RemoteContext(uuid)`
+
+- `uuid` is a UUID string that identifies the remote context and should match
+  with the `uuid` parameter of the URL of the remote context.
+- Callers should create the remote context outside this constructor (e.g.
+  `window.open('executor.html?uuid=' + uuid)`).
+
+## `RemoteContext.execute_script(fn, args)`
+
+- `fn` is a JavaScript function to execute on the remote context, which is
+  converted to a string using `toString()` and sent to the remote context.
+- `args` is null or an array of arguments to pass to the function on the
+  remote context. Arguments are passed as JSON.
+- If the return value of `fn` when executed in the remote context is a promise,
+  the promise returned by `execute_script` resolves to the resolved value of
+  that promise. Otherwise the `execute_script` promise resolves to the return
+  value of `fn`.
+
+Note that `fn` is evaluated on the remote context (`executor.html` in the
+example above), while `args` are evaluated on the caller context
+(`injector.html`) and then passed to the remote context.
+
+## Return value of injected functions and `execute_script()`
+
+If the return value of the injected function when executed in the remote
+context is a promise, the promise returned by `execute_script` resolves to the
+resolved value of that promise. Otherwise the `execute_script` promise resolves
+to the return value of the function.
+
+When the return value of an injected script is a Promise, it should be resolved
+before any navigation starts on the remote context. For example, it shouldn't
+be resolved after navigating out and navigating back to the page again.
+It's fine to create a Promise to be resolved after navigations, if it's not the
+return value of the injected function.
+
+## Calling timing of `execute_script()`
+
+When `RemoteContext.execute_script()` is called when the remote context is not
+active (for example before it is created, before navigation to the page, or
+during the page is in back-forward cache), the injected script is evaluated
+after the remote context becomes active.
+
+Multiple calls to `RemoteContext.execute_script()` will result in multiple scripts
+being executed in remote context and ordering will be maintained.
+
+## Errors from `execute_script()`
+
+Errors from `execute_script()` will result in promise rejections, so it is
+important to await the result.  This can be `await ctx.execute_script(...)` for
+every call but if there are multiple scripts to executed, it may be preferable
+to wait on them in parallel to avoid incurring full round-trip time for each,
+e.g.
+
+```js
+await Promise.all(
+  ctx1.execute_script(...),
+  ctx1.execute_script(...),
+  ctx2.execute_script(...),
+  ctx2.execute_script(...),
+  ...
+)
+```
+
+## Evaluation timing of injected functions
+
+The script injected by `RemoteContext.execute_script()` can be evaluated any
+time during the remote context is active.
+For example, even before DOMContentLoaded events or even during navigation.
+It's the responsibility of test-specific code/helpers to ensure evaluation
+timing constraints (which can be also test-specific), if any needed.
+
+### Ensuring evaluation timing around page load
+
+For example, to ensure that injected functions (`mainFunction` below) are
+evaluated after the first `pageshow` event, we can use pure JavaScript code
+like below:
+
+```
+// executor.html
+window.pageShowPromise = new Promise(resolve =>
+    window.addEventListener('pageshow', resolve, {once: true}));
+
+
+// injector.html
+const waitForPageShow = async () => {
+  while (!window.pageShowPromise) {
+    await new Promise(resolve => setTimeout(resolve, 100));
+  }
+  await window.pageShowPromise;
+};
+
+await ctx.execute(waitForPageShow);
+await ctx.execute(mainFunction);
+```
+
+### Ensuring evaluation timing around navigation out/unloading
+
+It can be important to ensure there are no injected functions nor code behind
+`RemoteContext` (such as Fetch APIs accessing server-side stash) running after
+navigation is initiated, for example in the case of back-forward cache testing.
+
+To ensure this,
+
+- Do not call the next `RemoteContext.execute()` for the remote context after
+  triggering the navigation, until we are sure that the remote context is not
+  active (e.g. after we confirm that the new page is loaded).
+- Call `Executor.suspend(callback)` synchronously within the injected script.
+  This suspends executor-related code, and calls `callback` when it is ready
+  to start navigation.
+
+The code on the injector side would be like:
+
+```
+// injector.html
+await ctx.execute_script(() => {
+  executor.suspend(() => {
+    location.href = 'new-url.html';
+  });
+});
+```
+
+## Future Work: Possible integration with `test_driver`
+
+Currently `RemoteContext` is implemented by JavaScript and WPT-server-side
+stash, and not integrated with `test_driver` nor `testharness`.
+There is a proposal of `test_driver`-integrated version (see the RFCs listed
+above).
+
+The API semantics and guidelines in this document are designed to be applicable
+to both the current stash-based `RemoteContext` and `test_driver`-based
+version, and thus the tests using `RemoteContext` will be migrated with minimum
+modifications (mostly in `/common/dispatcher/dispatcher.js` and executors), for
+example in a
+[draft CL](https://chromium-review.googlesource.com/c/chromium/src/+/3082215/).
+
+
+# `send()`/`receive()` Message passing APIs
+
+`dispatcher.js` (and its server-side backend `dispatcher.py`) provides a
+universal queue-based message passing API.
+Each queue is identified by a UUID, and accessed via the following APIs:
+
+-   `send(uuid, message)` pushes a string `message` to the queue `uuid`.
+-   `receive(uuid)` pops the first item from the queue `uuid`.
+-   `showRequestHeaders(origin, uuid)` and
+    `cacheableShowRequestHeaders(origin, uuid)` return URLs, that push request
+    headers to the queue `uuid` upon fetching.
+
+It works cross-origin, and even access different browser context groups.
+
+Messages are queued, this means one doesn't need to wait for the receiver to
+listen, before sending the first message
+(but still need to wait for the resolution of the promise returned by `send()`
+to ensure the order between `send()`s).
+
+## Executors
+
+Similar to `RemoteContext.execute_script()`, `send()`/`receive()` can be used
+for sending arbitrary javascript to be evaluated in another page or worker.
+
+- `executor.html` (as a Document),
+- `executor-worker.js` (as a Web Worker), and
+- `executor-service-worker.js` (as a Service Worker)
+
+are examples of executors.
+Note that these executors are NOT compatible with
+`RemoteContext.execute_script()`.
+
+## Future Work
+
+`send()`, `receive()` and the executors below are kept for COEP/COOP tests.
+
+For remote script execution, new tests should use
+`RemoteContext.execute_script()` instead.
+
+For message passing,
+[WPT RFC 90](https://github.com/web-platform-tests/rfcs/pull/90) is still under
+discussion.
diff --git a/test/wpt/tests/common/dispatcher/dispatcher.js b/test/wpt/tests/common/dispatcher/dispatcher.js
new file mode 100644
index 00000000000..a0f9f43e622
--- /dev/null
+++ b/test/wpt/tests/common/dispatcher/dispatcher.js
@@ -0,0 +1,256 @@
+// Define a universal message passing API. It works cross-origin and across
+// browsing context groups.
+const dispatcher_path = "/common/dispatcher/dispatcher.py";
+const dispatcher_url = new URL(dispatcher_path, location.href).href;
+
+// Return a promise, limiting the number of concurrent accesses to a shared
+// resources to |max_concurrent_access|.
+const concurrencyLimiter = (max_concurrency) => {
+  let pending = 0;
+  let waiting = [];
+  return async (task) => {
+    pending++;
+    if (pending > max_concurrency)
+      await new Promise(resolve => waiting.push(resolve));
+    let result = await task();
+    pending--;
+    waiting.shift()?.();
+    return result;
+  };
+}
+
+// Wait for a random amount of time in the range [10ms,100ms].
+const randomDelay = () => {
+  return new Promise(resolve => setTimeout(resolve, 10 + 90*Math.random()));
+}
+
+// Sending too many requests in parallel causes congestion. Limiting it improves
+// throughput.
+//
+// Note: The following table has been determined on the test:
+// ../cache-storage.tentative.https.html
+// using Chrome with a 64 core CPU / 64GB ram, in release mode:
+// ┌───────────┬───┬───┬───┬───┬───┬───┬───┬───┬───┬───┬───┬────┐
+// │concurrency│ 1 │ 2 │ 3 │ 4 │ 5 │ 6 │ 10│ 15│ 20│ 30│ 50│ 100│
+// ├───────────┼───┼───┼───┼───┼───┼───┼───┼───┼───┼───┼───┼────┤
+// │time (s)   │ 54│ 38│ 31│ 29│ 26│ 24│ 22│ 22│ 22│ 22│ 34│ 36 │
+// └───────────┴───┴───┴───┴───┴───┴───┴───┴───┴───┴───┴───┴────┘
+const limiter = concurrencyLimiter(6);
+
+// While requests to different remote contexts can go in parallel, we need to
+// ensure that requests to each remote context are done in order. This maps a
+// uuid to a queue of requests to send. A queue is processed until it is empty
+// and then is deleted from the map.
+const sendQueues = new Map();
+
+// Sends a single item (with rate-limiting) and calls the associated resolver
+// when it is successfully sent.
+const sendItem = async function (uuid, resolver, message) {
+  await limiter(async () => {
+    // Requests might be dropped. Retry until getting a confirmation it has been
+    // processed.
+    while(1) {
+      try {
+        let response = await fetch(dispatcher_url + `?uuid=${uuid}`, {
+          method: 'POST',
+          body: message
+        })
+        if (await response.text() == "done") {
+          resolver();
+          return;
+        }
+      } catch (fetch_error) {}
+      await randomDelay();
+    };
+  });
+}
+
+// While the queue is non-empty, send the next item. This is async and new items
+// may be added to the queue while others are being sent.
+const processQueue = async function (uuid, queue) {
+  while (queue.length) {
+    const [resolver, message] = queue.shift();
+    await sendItem(uuid, resolver, message);
+  }
+  // The queue is empty, delete it.
+  sendQueues.delete(uuid);
+}
+
+const send = async function (uuid, message) {
+  const itemSentPromise = new Promise((resolve) => {
+    const item = [resolve, message];
+    if (sendQueues.has(uuid)) {
+      // There is already a queue for `uuid`, just add to it and it will be processed.
+      sendQueues.get(uuid).push(item);
+    } else {
+      // There is no queue for `uuid`, create it and start processing.
+      const queue = [item];
+      sendQueues.set(uuid, queue);
+      processQueue(uuid, queue);
+    }
+  });
+  // Wait until the item has been successfully sent.
+  await itemSentPromise;
+}
+
+const receive = async function (uuid) {
+  while(1) {
+    let data = "not ready";
+    try {
+      data = await limiter(async () => {
+        let response = await fetch(dispatcher_url + `?uuid=${uuid}`);
+        return await response.text();
+      });
+    } catch (fetch_error) {}
+
+    if (data == "not ready") {
+      await randomDelay();
+      continue;
+    }
+
+    return data;
+  }
+}
+
+// Returns an URL. When called, the server sends toward the `uuid` queue the
+// request headers. Useful for determining if something was requested with
+// Cookies.
+const showRequestHeaders = function(origin, uuid) {
+  return origin + dispatcher_path + `?uuid=${uuid}&show-headers`;
+}
+
+// Same as above, except for the response is cacheable.
+const cacheableShowRequestHeaders = function(origin, uuid) {
+  return origin + dispatcher_path + `?uuid=${uuid}&cacheable&show-headers`;
+}
+
+// This script requires
+// - `/common/utils.js` for `token()`.
+
+// Returns the URL of a document that can be used as a `RemoteContext`.
+//
+// `uuid` should be a UUID uniquely identifying the given remote context.
+// `options` has the following shape:
+//
+// {
+//   host: (optional) Sets the returned URL's `host` property. Useful for
+//     cross-origin executors.
+//   protocol: (optional) Sets the returned URL's `protocol` property.
+// }
+function remoteExecutorUrl(uuid, options) {
+  const url = new URL("/common/dispatcher/remote-executor.html", location);
+  url.searchParams.set("uuid", uuid);
+
+  if (options?.host) {
+    url.host = options.host;
+  }
+
+  if (options?.protocol) {
+    url.protocol = options.protocol;
+  }
+
+  return url;
+}
+
+// Represents a remote executor. For more detailed explanation see `README.md`.
+class RemoteContext {
+  // `uuid` is a UUID string that identifies the remote context and should
+  // match with the `uuid` parameter of the URL of the remote context.
+  constructor(uuid) {
+    this.context_id = uuid;
+  }
+
+  // Evaluates the script `expr` on the executor.
+  // - If `expr` is evaluated to a Promise that is resolved with a value:
+  //   `execute_script()` returns a Promise resolved with the value.
+  // - If `expr` is evaluated to a non-Promise value:
+  //   `execute_script()` returns a Promise resolved with the value.
+  // - If `expr` throws an error or is evaluated to a Promise that is rejected:
+  //   `execute_script()` returns a rejected Promise with the error's
+  //   `message`.
+  //   Note that currently the type of error (e.g. DOMException) is not
+  //   preserved, except for `TypeError`.
+  // The values should be able to be serialized by JSON.stringify().
+  async execute_script(fn, args) {
+    const receiver = token();
+    await this.send({receiver: receiver, fn: fn.toString(), args: args});
+    const response = JSON.parse(await receive(receiver));
+    if (response.status === 'success') {
+      return response.value;
+    }
+
+    // exception
+    if (response.name === 'TypeError') {
+      throw new TypeError(response.value);
+    }
+    throw new Error(response.value);
+  }
+
+  async send(msg) {
+    return await send(this.context_id, JSON.stringify(msg));
+  }
+};
+
+class Executor {
+  constructor(uuid) {
+    this.uuid = uuid;
+
+    // If `suspend_callback` is not `null`, the executor should be suspended
+    // when there are no ongoing tasks.
+    this.suspend_callback = null;
+
+    this.execute();
+  }
+
+  // Wait until there are no ongoing tasks nor fetch requests for polling
+  // tasks, and then suspend the executor and call `callback()`.
+  // Navigation from the executor page should be triggered inside `callback()`,
+  // to avoid conflict with in-flight fetch requests.
+  suspend(callback) {
+    this.suspend_callback = callback;
+  }
+
+  resume() {
+  }
+
+  async execute() {
+    while(true) {
+      if (this.suspend_callback !== null) {
+        this.suspend_callback();
+        this.suspend_callback = null;
+        // Wait for `resume()` to be called.
+        await new Promise(resolve => this.resume = resolve);
+
+        // Workaround for https://crbug.com/1244230.
+        // Without this workaround, the executor is resumed and the fetch
+        // request to poll the next task is initiated synchronously from
+        // pageshow event after the page restored from BFCache, and the fetch
+        // request promise is never resolved (and thus the test results in
+        // timeout) due to https://crbug.com/1244230. The root cause is not yet
+        // known, but setTimeout() with 0ms causes the resume triggered on
+        // another task and seems to resolve the issue.
+        await new Promise(resolve => setTimeout(resolve, 0));
+
+        continue;
+      }
+
+      const task = JSON.parse(await receive(this.uuid));
+
+      let response;
+      try {
+        const value = await eval(task.fn).apply(null, task.args);
+        response = JSON.stringify({
+          status: 'success',
+          value: value
+        });
+      } catch(e) {
+        response = JSON.stringify({
+          status: 'exception',
+          name: e.name,
+          value: e.message
+        });
+      }
+      await send(task.receiver, response);
+    }
+  }
+}
diff --git a/test/wpt/tests/common/dispatcher/dispatcher.py b/test/wpt/tests/common/dispatcher/dispatcher.py
new file mode 100644
index 00000000000..9fe7a38ac87
--- /dev/null
+++ b/test/wpt/tests/common/dispatcher/dispatcher.py
@@ -0,0 +1,53 @@
+import json
+from wptserve.utils import isomorphic_decode
+
+# A server used to store and retrieve arbitrary data.
+# This is used by: ./dispatcher.js
+def main(request, response):
+    # This server is configured so that is accept to receive any requests and
+    # any cookies the web browser is willing to send.
+    response.headers.set(b"Access-Control-Allow-Credentials", b"true")
+    response.headers.set(b'Access-Control-Allow-Methods', b'OPTIONS, GET, POST')
+    response.headers.set(b'Access-Control-Allow-Headers', b'Content-Type')
+    response.headers.set(b"Access-Control-Allow-Origin", request.headers.get(b"origin") or '*')
+
+    if b"cacheable" in request.GET:
+        response.headers.set(b"Cache-Control", b"max-age=31536000")
+    else:
+        response.headers.set(b'Cache-Control', b'no-cache, no-store, must-revalidate')
+
+    # CORS preflight
+    if request.method == u'OPTIONS':
+        return b''
+
+    uuid = request.GET[b'uuid']
+    stash = request.server.stash;
+
+    # The stash is accessed concurrently by many clients. A lock is used to
+    # avoid unterleaved read/write from different clients.
+    with stash.lock:
+        queue = stash.take(uuid, '/common/dispatcher') or [];
+
+        # Push into the |uuid| queue, the requested headers.
+        if b"show-headers" in request.GET:
+            headers = {};
+            for key, value in request.headers.items():
+                headers[isomorphic_decode(key)] = isomorphic_decode(request.headers[key])
+            headers = json.dumps(headers);
+            queue.append(headers);
+            ret = b'';
+
+        # Push into the |uuid| queue, the posted data.
+        elif request.method == u'POST':
+            queue.append(request.body)
+            ret = b'done'
+
+        # Pull from the |uuid| queue, the posted data.
+        else:
+            if len(queue) == 0:
+                ret = b'not ready'
+            else:
+                ret = queue.pop(0)
+
+        stash.put(uuid, queue, '/common/dispatcher')
+    return ret;
diff --git a/test/wpt/tests/common/dispatcher/executor-service-worker.js b/test/wpt/tests/common/dispatcher/executor-service-worker.js
new file mode 100644
index 00000000000..0b47d66b65f
--- /dev/null
+++ b/test/wpt/tests/common/dispatcher/executor-service-worker.js
@@ -0,0 +1,24 @@
+importScripts('./dispatcher.js');
+
+const params = new URLSearchParams(location.search);
+const uuid = params.get('uuid');
+
+// The fetch handler must be registered before parsing the main script response.
+// So do it here, for future use.
+fetchHandler = () => {}
+addEventListener('fetch', e => {
+  fetchHandler(e);
+});
+
+// Force ServiceWorker to immediately activate itself.
+addEventListener('install', event => {
+  skipWaiting();
+});
+
+let executeOrders = async function() {
+  while(true) {
+    let task = await receive(uuid);
+    eval(`(async () => {${task}})()`);
+  }
+};
+executeOrders();
diff --git a/test/wpt/tests/common/dispatcher/executor-worker.js b/test/wpt/tests/common/dispatcher/executor-worker.js
new file mode 100644
index 00000000000..ea065a6bf11
--- /dev/null
+++ b/test/wpt/tests/common/dispatcher/executor-worker.js
@@ -0,0 +1,12 @@
+importScripts('./dispatcher.js');
+
+const params = new URLSearchParams(location.search);
+const uuid = params.get('uuid');
+
+let executeOrders = async function() {
+  while(true) {
+    let task = await receive(uuid);
+    eval(`(async () => {${task}})()`);
+  }
+};
+executeOrders();
diff --git a/test/wpt/tests/common/dispatcher/executor.html b/test/wpt/tests/common/dispatcher/executor.html
new file mode 100644
index 00000000000..5fe6a95efaf
--- /dev/null
+++ b/test/wpt/tests/common/dispatcher/executor.html
@@ -0,0 +1,15 @@
+<script src="./dispatcher.js"></script>
+<script>
+
+const params = new URLSearchParams(window.location.search);
+const uuid = params.get('uuid');
+
+let executeOrders = async function() {
+  while(true) {
+    let task = await receive(uuid);
+    eval(`(async () => {${task}})()`);
+  }
+};
+executeOrders();
+
+</script>
diff --git a/test/wpt/tests/common/dispatcher/remote-executor.html b/test/wpt/tests/common/dispatcher/remote-executor.html
new file mode 100644
index 00000000000..8b0030390d0
--- /dev/null
+++ b/test/wpt/tests/common/dispatcher/remote-executor.html
@@ -0,0 +1,12 @@
+<!DOCTYPE html>
+<html>
+<meta charset="utf-8">
+<body>
+</body>
+<script src="./dispatcher.js"></script>
+<script>
+  const params = new URLSearchParams(window.location.search);
+  const uuid = params.get('uuid');
+  const executor = new Executor(uuid);  // `execute()` is called in constructor.
+</script>
+</html>
diff --git a/test/wpt/tests/common/domain-setter.sub.html b/test/wpt/tests/common/domain-setter.sub.html
new file mode 100644
index 00000000000..ad3b9f8b808
--- /dev/null
+++ b/test/wpt/tests/common/domain-setter.sub.html
@@ -0,0 +1,8 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>A page that will likely be same-origin-domain but not same-origin</title>
+
+<script>
+"use strict";
+document.domain = "{{host}}";
+</script>
diff --git a/test/wpt/tests/common/dummy.xhtml b/test/wpt/tests/common/dummy.xhtml
new file mode 100644
index 00000000000..dba6945f4ba
--- /dev/null
+++ b/test/wpt/tests/common/dummy.xhtml
@@ -0,0 +1,2 @@
+<!DOCTYPE html>
+<html xmlns="http://www.w3.org/1999/xhtml"><head><title>Dummy XHTML document</title></head><body /></html>
diff --git a/test/wpt/tests/common/dummy.xml b/test/wpt/tests/common/dummy.xml
new file mode 100644
index 00000000000..4a60c3035fc
--- /dev/null
+++ b/test/wpt/tests/common/dummy.xml
@@ -0,0 +1 @@
+<foo>Dummy XML document</foo>
diff --git a/test/wpt/tests/common/echo.py b/test/wpt/tests/common/echo.py
new file mode 100644
index 00000000000..911b54a0b48
--- /dev/null
+++ b/test/wpt/tests/common/echo.py
@@ -0,0 +1,6 @@
+def main(request, response):
+    # Without X-XSS-Protection to disable non-standard XSS protection the functionality this
+    # resource offers is useless
+    response.headers.set(b"X-XSS-Protection", b"0")
+    response.headers.set(b"Content-Type", b"text/html")
+    response.content = request.GET.first(b"content")
diff --git a/test/wpt/tests/common/gc.js b/test/wpt/tests/common/gc.js
new file mode 100644
index 00000000000..ac43a4cfaf7
--- /dev/null
+++ b/test/wpt/tests/common/gc.js
@@ -0,0 +1,52 @@
+/**
+ * Does a best-effort attempt at invoking garbage collection. Attempts to use
+ * the standardized `TestUtils.gc()` function, but falls back to other
+ * environment-specific nonstandard functions, with a final result of just
+ * creating a lot of garbage (in which case you will get a console warning).
+ *
+ * This should generally only be used to attempt to trigger bugs and crashes
+ * inside tests, i.e. cases where if garbage collection happened, then this
+ * should not trigger some misbehavior. You cannot rely on garbage collection
+ * successfully trigger, or that any particular unreachable object will be
+ * collected.
+ *
+ * @returns {Promise<undefined>} A promise you should await to ensure garbage
+ * collection has had a chance to complete.
+ */
+self.garbageCollect = async () => {
+  // https://testutils.spec.whatwg.org/#the-testutils-namespace
+  if (self.TestUtils?.gc) {
+    return TestUtils.gc();
+  }
+
+  // Use --expose_gc for V8 (and Node.js)
+  // to pass this flag at chrome launch use: --js-flags="--expose-gc"
+  // Exposed in SpiderMonkey shell as well
+  if (self.gc) {
+    return self.gc();
+  }
+
+  // Present in some WebKit development environments
+  if (self.GCController) {
+    return GCController.collect();
+  }
+
+  console.warn(
+    'Tests are running without the ability to do manual garbage collection. ' +
+    'They will still work, but coverage will be suboptimal.');
+
+  for (var i = 0; i < 1000; i++) {
+    gcRec(10);
+  }
+
+  function gcRec(n) {
+    if (n < 1) {
+      return {};
+    }
+
+    let temp = { i: "ab" + i + i / 100000 };
+    temp += "foo";
+
+    gcRec(n - 1);
+  }
+};
diff --git a/test/wpt/tests/common/get-host-info.sub.js.headers b/test/wpt/tests/common/get-host-info.sub.js.headers
new file mode 100644
index 00000000000..6805c323df5
--- /dev/null
+++ b/test/wpt/tests/common/get-host-info.sub.js.headers
@@ -0,0 +1 @@
+Content-Type: text/javascript; charset=utf-8
diff --git a/test/wpt/tests/common/media.js b/test/wpt/tests/common/media.js
new file mode 100644
index 00000000000..f2dc8612660
--- /dev/null
+++ b/test/wpt/tests/common/media.js
@@ -0,0 +1,55 @@
+/**
+ * Returns the URL of a supported video source based on the user agent
+ * @param {string} base - media URL without file extension
+ * @returns {string}
+ */
+function getVideoURI(base)
+{
+    var extension = '.mp4';
+
+    var videotag = document.createElement("video");
+
+    if ( videotag.canPlayType  &&
+         videotag.canPlayType('video/ogg; codecs="theora, vorbis"') )
+    {
+        extension = '.ogv';
+    }
+
+    return base + extension;
+}
+
+/**
+ * Returns the URL of a supported audio source based on the user agent
+ * @param {string} base - media URL without file extension
+ * @returns {string}
+ */
+function getAudioURI(base)
+{
+    var extension = '.mp3';
+
+    var audiotag = document.createElement("audio");
+
+    if ( audiotag.canPlayType &&
+         audiotag.canPlayType('audio/ogg') )
+    {
+        extension = '.oga';
+    }
+
+    return base + extension;
+}
+
+/**
+ * Returns the MIME type for a media URL based on the file extension.
+ * @param {string} url
+ * @returns {string}
+ */
+function getMediaContentType(url) {
+    var extension = new URL(url, location).pathname.split(".").pop();
+    var map = {
+        "mp4": "video/mp4",
+        "ogv": "application/ogg",
+        "mp3": "audio/mp3",
+        "oga": "application/ogg",
+    };
+    return map[extension];
+}
diff --git a/test/wpt/tests/common/media.js.headers b/test/wpt/tests/common/media.js.headers
new file mode 100644
index 00000000000..6805c323df5
--- /dev/null
+++ b/test/wpt/tests/common/media.js.headers
@@ -0,0 +1 @@
+Content-Type: text/javascript; charset=utf-8
diff --git a/test/wpt/tests/common/object-association.js b/test/wpt/tests/common/object-association.js
new file mode 100644
index 00000000000..669c17c07b1
--- /dev/null
+++ b/test/wpt/tests/common/object-association.js
@@ -0,0 +1,74 @@
+"use strict";
+
+// This is for testing whether an object (e.g., a global property) is associated with Window, or
+// with Document. Recall that Window and Document are 1:1 except when doing a same-origin navigation
+// away from the initial about:blank. In that case the Window object gets reused for the new
+// Document.
+//
+// So:
+// - If something is per-Window, then it should maintain its identity across an about:blank
+//   navigation.
+// - If something is per-Document, then it should be recreated across an about:blank navigation.
+
+window.testIsPerWindow = propertyName => {
+  runTests(propertyName, assert_equals, "must not");
+};
+
+window.testIsPerDocument = propertyName => {
+  runTests(propertyName, assert_not_equals, "must");
+};
+
+function runTests(propertyName, equalityOrInequalityAsserter, mustOrMustNotReplace) {
+  async_test(t => {
+    const iframe = document.createElement("iframe");
+    document.body.appendChild(iframe);
+    const frame = iframe.contentWindow;
+
+    const before = frame[propertyName];
+    assert_implements(before, `window.${propertyName} must be implemented`);
+
+    iframe.onload = t.step_func_done(() => {
+      const after = frame[propertyName];
+      equalityOrInequalityAsserter(after, before);
+    });
+
+    iframe.src = "/common/blank.html";
+  }, `Navigating from the initial about:blank ${mustOrMustNotReplace} replace window.${propertyName}`);
+
+  // Per spec, discarding a browsing context should not change any of the global objects.
+  test(() => {
+    const iframe = document.createElement("iframe");
+    document.body.appendChild(iframe);
+    const frame = iframe.contentWindow;
+
+    const before = frame[propertyName];
+    assert_implements(before, `window.${propertyName} must be implemented`);
+
+    iframe.remove();
+
+    const after = frame[propertyName];
+    assert_equals(after, before, `window.${propertyName} should not change after iframe.remove()`);
+  }, `Discarding the browsing context must not change window.${propertyName}`);
+
+  // Per spec, document.open() should not change any of the global objects. In historical versions
+  // of the spec, it did, so we test here.
+  async_test(t => {
+    const iframe = document.createElement("iframe");
+
+    iframe.onload = t.step_func_done(() => {
+      const frame = iframe.contentWindow;
+      const before = frame[propertyName];
+      assert_implements(before, `window.${propertyName} must be implemented`);
+
+      frame.document.open();
+
+      const after = frame[propertyName];
+      assert_equals(after, before);
+
+      frame.document.close();
+    });
+
+    iframe.src = "/common/blank.html";
+    document.body.appendChild(iframe);
+  }, `document.open() must not replace window.${propertyName}`);
+}
diff --git a/test/wpt/tests/common/object-association.js.headers b/test/wpt/tests/common/object-association.js.headers
new file mode 100644
index 00000000000..6805c323df5
--- /dev/null
+++ b/test/wpt/tests/common/object-association.js.headers
@@ -0,0 +1 @@
+Content-Type: text/javascript; charset=utf-8
diff --git a/test/wpt/tests/common/performance-timeline-utils.js b/test/wpt/tests/common/performance-timeline-utils.js
new file mode 100644
index 00000000000..b20241cc610
--- /dev/null
+++ b/test/wpt/tests/common/performance-timeline-utils.js
@@ -0,0 +1,56 @@
+/*
+author: W3C http://www.w3.org/
+help: http://www.w3.org/TR/navigation-timing/#sec-window.performance-attribute
+*/
+var performanceNamespace = window.performance;
+var namespace_check = false;
+function wp_test(func, msg, properties)
+{
+  // only run the namespace check once
+  if (!namespace_check)
+  {
+    namespace_check = true;
+
+    if (performanceNamespace === undefined || performanceNamespace == null)
+    {
+      // show a single error that window.performance is undefined
+      // The window.performance attribute provides a hosting area for performance related attributes.
+      test(function() { assert_true(performanceNamespace !== undefined && performanceNamespace != null, "window.performance is defined and not null"); }, "window.performance is defined and not null.");
+    }
+  }
+
+  test(func, msg, properties);
+}
+
+function test_true(value, msg, properties)
+{
+  wp_test(function () { assert_true(value, msg); }, msg, properties);
+}
+
+function test_equals(value, equals, msg, properties)
+{
+  wp_test(function () { assert_equals(value, equals, msg); }, msg, properties);
+}
+
+// assert for every entry in `expectedEntries`, there is a matching entry _somewhere_ in `actualEntries`
+function test_entries(actualEntries, expectedEntries) {
+  test_equals(actualEntries.length, expectedEntries.length)
+  expectedEntries.forEach(function (expectedEntry) {
+    var foundEntry = actualEntries.find(function (actualEntry) {
+      return typeof Object.keys(expectedEntry).find(function (key) {
+            return actualEntry[key] !== expectedEntry[key]
+          }) === 'undefined'
+    })
+    test_true(!!foundEntry, `Entry ${JSON.stringify(expectedEntry)} could not be found.`)
+    if (foundEntry) {
+      assert_object_equals(foundEntry.toJSON(), expectedEntry)
+    }
+  })
+}
+
+function delayedLoadListener(callback) {
+  window.addEventListener('load', function() {
+    // TODO(cvazac) Remove this setTimeout when spec enforces sync entries.
+    step_timeout(callback, 0)
+  })
+}
diff --git a/test/wpt/tests/common/performance-timeline-utils.js.headers b/test/wpt/tests/common/performance-timeline-utils.js.headers
new file mode 100644
index 00000000000..6805c323df5
--- /dev/null
+++ b/test/wpt/tests/common/performance-timeline-utils.js.headers
@@ -0,0 +1 @@
+Content-Type: text/javascript; charset=utf-8
diff --git a/test/wpt/tests/common/proxy-all.sub.pac b/test/wpt/tests/common/proxy-all.sub.pac
new file mode 100644
index 00000000000..de601e5d702
--- /dev/null
+++ b/test/wpt/tests/common/proxy-all.sub.pac
@@ -0,0 +1,3 @@
+function FindProxyForURL(url, host) {
+    return "PROXY {{host}}:{{ports[http][0]}}"
+}
diff --git a/test/wpt/tests/common/redirect-opt-in.py b/test/wpt/tests/common/redirect-opt-in.py
new file mode 100644
index 00000000000..b5e674a27fb
--- /dev/null
+++ b/test/wpt/tests/common/redirect-opt-in.py
@@ -0,0 +1,20 @@
+def main(request, response):
+    """Simple handler that causes redirection.
+
+    The request should typically have two query parameters:
+    status - The status to use for the redirection. Defaults to 302.
+    location - The resource to redirect to.
+    """
+    status = 302
+    if b"status" in request.GET:
+        try:
+            status = int(request.GET.first(b"status"))
+        except ValueError:
+            pass
+
+    response.status = status
+
+    location = request.GET.first(b"location")
+
+    response.headers.set(b"Location", location)
+    response.headers.set(b"Timing-Allow-Origin", b"*")
diff --git a/test/wpt/tests/common/redirect.py b/test/wpt/tests/common/redirect.py
new file mode 100644
index 00000000000..f2fd1ebd51d
--- /dev/null
+++ b/test/wpt/tests/common/redirect.py
@@ -0,0 +1,19 @@
+def main(request, response):
+    """Simple handler that causes redirection.
+
+    The request should typically have two query parameters:
+    status - The status to use for the redirection. Defaults to 302.
+    location - The resource to redirect to.
+    """
+    status = 302
+    if b"status" in request.GET:
+        try:
+            status = int(request.GET.first(b"status"))
+        except ValueError:
+            pass
+
+    response.status = status
+
+    location = request.GET.first(b"location")
+
+    response.headers.set(b"Location", location)
diff --git a/test/wpt/tests/common/refresh.py b/test/wpt/tests/common/refresh.py
new file mode 100644
index 00000000000..0d309900d47
--- /dev/null
+++ b/test/wpt/tests/common/refresh.py
@@ -0,0 +1,11 @@
+def main(request, response):
+    """
+    Respond with a blank HTML document and a `Refresh` header which describes
+    an immediate redirect to the URL specified by the requests `location` query
+    string parameter
+    """
+    headers = [
+        (b'Content-Type', b'text/html'),
+        (b'Refresh', b'0; URL=' + request.GET.first(b'location'))
+    ]
+    return (200, headers, b'')
diff --git a/test/wpt/tests/common/reftest-wait.js b/test/wpt/tests/common/reftest-wait.js
new file mode 100644
index 00000000000..64fe9bfd7f5
--- /dev/null
+++ b/test/wpt/tests/common/reftest-wait.js
@@ -0,0 +1,39 @@
+/**
+ * Remove the `reftest-wait` class on the document element.
+ * The reftest runner will wait with taking a screenshot while
+ * this class is present.
+ *
+ * See https://web-platform-tests.org/writing-tests/reftests.html#controlling-when-comparison-occurs
+ */
+function takeScreenshot() {
+    document.documentElement.classList.remove("reftest-wait");
+}
+
+/**
+ * Call `takeScreenshot()` after a delay of at least |timeout| milliseconds.
+ * @param {number} timeout - milliseconds
+ */
+function takeScreenshotDelayed(timeout) {
+    setTimeout(function() {
+        takeScreenshot();
+    }, timeout);
+}
+
+/**
+ * Ensure that a precondition is met before waiting for a screenshot.
+ * @param {bool} condition - Fail the test if this evaluates to false
+ * @param {string} msg - Error message to write to the screenshot
+ */
+function failIfNot(condition, msg) {
+  const fail = () => {
+    (document.body || document.documentElement).textContent = `Precondition Failed: ${msg}`;
+    takeScreenshot();
+  };
+  if (!condition) {
+    if (document.readyState == "interactive") {
+      fail();
+    } else {
+      document.addEventListener("DOMContentLoaded", fail, false);
+    }
+  }
+}
diff --git a/test/wpt/tests/common/reftest-wait.js.headers b/test/wpt/tests/common/reftest-wait.js.headers
new file mode 100644
index 00000000000..6805c323df5
--- /dev/null
+++ b/test/wpt/tests/common/reftest-wait.js.headers
@@ -0,0 +1 @@
+Content-Type: text/javascript; charset=utf-8
diff --git a/test/wpt/tests/common/rendering-utils.js b/test/wpt/tests/common/rendering-utils.js
new file mode 100644
index 00000000000..46283bd5d07
--- /dev/null
+++ b/test/wpt/tests/common/rendering-utils.js
@@ -0,0 +1,19 @@
+"use strict";
+
+/**
+ * Waits until we have at least one frame rendered, regardless of the engine.
+ *
+ * @returns {Promise}
+ */
+function waitForAtLeastOneFrame() {
+  return new Promise(resolve => {
+    // Different web engines work slightly different on this area but waiting
+    // for two requestAnimationFrames() to happen, one after another, should be
+    // sufficient to ensure at least one frame has been generated anywhere.
+    window.requestAnimationFrame(() => {
+      window.requestAnimationFrame(() => {
+        resolve();
+      });
+    });
+  });
+}
diff --git a/test/wpt/tests/common/sab.js b/test/wpt/tests/common/sab.js
new file mode 100644
index 00000000000..a3ea610e165
--- /dev/null
+++ b/test/wpt/tests/common/sab.js
@@ -0,0 +1,21 @@
+const createBuffer = (() => {
+  // See https://github.com/whatwg/html/issues/5380 for why not `new SharedArrayBuffer()`
+  let sabConstructor;
+  try {
+    sabConstructor = new WebAssembly.Memory({ shared:true, initial:0, maximum:0 }).buffer.constructor;
+  } catch(e) {
+    sabConstructor = null;
+  }
+  return (type, length, opts) => {
+    if (type === "ArrayBuffer") {
+      return new ArrayBuffer(length, opts);
+    } else if (type === "SharedArrayBuffer") {
+      if (sabConstructor && sabConstructor.name !== "SharedArrayBuffer") {
+        throw new Error("WebAssembly.Memory does not support shared:true");
+      }
+      return new sabConstructor(length, opts);
+    } else {
+      throw new Error("type has to be ArrayBuffer or SharedArrayBuffer");
+    }
+  }
+})();
diff --git a/test/wpt/tests/common/security-features/README.md b/test/wpt/tests/common/security-features/README.md
new file mode 100644
index 00000000000..f957541f75e
--- /dev/null
+++ b/test/wpt/tests/common/security-features/README.md
@@ -0,0 +1,460 @@
+This directory contains the common infrastructure for the following tests (also referred below as projects).
+
+- referrer-policy/
+- mixed-content/
+- upgrade-insecure-requests/
+
+Subdirectories:
+
+- `resources`:
+    Serves JavaScript test helpers.
+- `subresource`:
+    Serves subresources, with support for redirects, stash, etc.
+    The subresource paths are managed by `subresourceMap` and
+    fetched in `requestVia*()` functions in `resources/common.js`.
+- `scope`:
+    Serves nested contexts, such as iframe documents or workers.
+    Used from `invokeFrom*()` functions in `resources/common.js`.
+- `tools`:
+    Scripts that generate test HTML files. Not used while running tests.
+- `/referrer-policy/generic/subresource-test`:
+    Sanity checking tests for subresource invocation
+    (This is still placed outside common/)
+
+# Test generator
+
+The test generator ([common/security-features/tools/generate.py](tools/generate.py)) generates test HTML files from templates and a seed (`spec.src.json`) that defines all the test scenarios.
+
+The project (i.e. a WPT subdirectory, for example `referrer-policy/`) that uses the generator should define per-project data and invoke the common generator logic in `common/security-features/tools`.
+
+This is the overview of the project structure:
+
+```
+common/security-features/
+└── tools/ - the common test generator logic
+    ├── spec.src.json
+    └── template/ - the test files templates
+project-directory/ (e.g. referrer-policy/)
+├── spec.src.json
+├── generic/
+│   ├── test-case.sub.js - Per-project test helper
+│   ├── sanity-checker.js (Used by debug target only)
+│   └── spec_json.js (Used by debug target only)
+└── gen/ - generated tests
+```
+
+## Generating the tests
+
+Note: When the repository already contains generated tests, [remove all generated tests](#removing-all-generated-tests) first.
+
+```bash
+# Install json5 module if needed.
+pip install --user json5
+
+# Generate the test files under gen/ (HTMLs and .headers files).
+path/to/common/security-features/tools/generate.py --spec path/to/project-directory/
+
+# Add all generated tests to the repo.
+git add path/to/project-directory/gen/ && git commit -m "Add generated tests"
+```
+
+This will parse the spec JSON5 files and determine which tests to generate (or skip) while using templates.
+
+- The default spec JSON5: `common/security-features/tools/spec.src.json`.
+    - Describes common configurations, such as subresource types, source context types, etc.
+- The per-project spec JSON5: `project-directory/spec.src.json`.
+    - Describes project-specific configurations, particularly those related to test generation patterns (`specification`), policy deliveries (e.g. `delivery_type`, `delivery_value`) and `expectation`.
+
+For how these two spec JSON5 files are merged, see [Sub projects](#sub-projects) section.
+
+Note: `spec.src.json` is transitioning to JSON5 [#21710](https://github.com/web-platform-tests/wpt/issues/21710).
+
+During the generation, the spec is validated by ```common/security-features/tools/spec_validator.py```. This is specially important when you're making changes to  `spec.src.json`. Make sure it's a valid JSON (no comments or trailing commas). The validator reports specific errors (missing keys etc.), if any.
+
+### Removing all generated tests
+
+Simply remove all files under `project-directory/gen/`.
+
+```bash
+rm -r path/to/project-directory/gen/
+```
+
+### Options for generating tests
+
+Note: this section is currently obsolete. Only the release template is working.
+
+The generator script has two targets: ```release``` and ```debug```.
+
+* Using **release** for the target will produce tests using a template for optimizing size and performance. The release template is intended for the official web-platform-tests and possibly other test suites. No sanity checking is done in release mode. Use this option whenever you're checking into web-platform-tests.
+
+* When generating for ```debug```, the produced tests will contain more verbosity and sanity checks. Use this target to identify problems with the test suites when making changes locally. Make sure you don't check in tests generated with the debug target.
+
+Note that **release** is the default target when invoking ```generate.py```.
+
+
+## Sub projects
+
+Projects can be nested, for example to reuse a single `spec.src.json` across similar but slightly different sets of generated tests.
+The directory structure would look like:
+
+```
+project-directory/ (e.g. referrer-policy/)
+├── spec.src.json - Parent project's spec JSON
+├── generic/
+│   └── test-case.sub.js - Parent project's test helper
+├── gen/ - parent project's generated tests
+└── sub-project-directory/ (e.g. 4K)
+    ├── spec.src.json - Child project's spec JSON
+    ├── generic/
+    │   └── test-case.sub.js - Child project's test helper
+    └── gen/ - child project's generated tests
+```
+
+`generate.py --spec project-directory/sub-project-directory` generates test files under `project-directory/sub-project-directory/gen`, based on `project-directory/spec.src.json` and `project-directory/sub-project-directory/spec.src.json`.
+
+- The child project's `spec.src.json` is merged into parent project's `spec.src.json`.
+    - Two spec JSON objects are merged recursively.
+    - If a same key exists in both objects, the child's value overwrites the parent's value.
+        - If both (child's and parent's) values are arrays, then the child's value is concatenated to the parent's value.
+    - For debugging, `generate.py` dumps the merged spec JSON object as `generic/debug-output.spec.src.json`.
+- The child project's generated tests include both of the parent and child project's `test-case.sub.js`:
+  ```html
+  <script src="project-directory/test-case.sub.js"></script>
+  <script src="project-directory/sub-project-directory/test-case.sub.js"></script>
+  <script>
+    TestCase(...);
+  </script>
+  ```
+
+
+## Updating the tests
+
+The main test logic lives in ```project-directory/generic/test-case.sub.js``` with helper functions defined in ```/common/security-features/resources/common.js``` so you should probably start there.
+
+For updating the test suites you will most likely do **a subset** of the following:
+
+* Add a new subresource type:
+
+  * Add a new sub-resource python script to `/common/security-features/subresource/`.
+  * Add a sanity check test for a sub-resource to `referrer-policy/generic/subresource-test/`.
+  * Add a new entry to `subresourceMap` in `/common/security-features/resources/common.js`.
+  * Add a new entry to `valid_subresource_names` in `/common/security-features/tools/spec_validator.py`.
+  * Add a new entry to `subresource_schema` in `spec.src.json`.
+  * Update `source_context_schema` to specify in which source context the subresource can be used.
+
+* Add a new subresource redirection type
+
+  * TODO: to be documented. Example: [https://github.com/web-platform-tests/wpt/pull/18939](https://github.com/web-platform-tests/wpt/pull/18939)
+
+* Add a new subresource origin type
+
+  * TODO: to be documented. Example: [https://github.com/web-platform-tests/wpt/pull/18940](https://github.com/web-platform-tests/wpt/pull/18940)
+
+* Add a new source context (e.g. "module sharedworker global scope")
+
+  * TODO: to be documented. Example: [https://github.com/web-platform-tests/wpt/pull/18904](https://github.com/web-platform-tests/wpt/pull/18904)
+
+* Add a new source context list (e.g. "subresource request from a dedicated worker in a `<iframe srcdoc>`")
+
+  * TODO: to be documented.
+
+* Implement new or update existing assertions in ```project-directory/generic/test-case.sub.js```.
+
+* Exclude or add some tests by updating ```spec.src.json``` test expansions.
+
+* Implement a new delivery method.
+
+  * TODO: to be documented. Currently the support for delivery methods are implemented in many places across `common/security-features/`.
+
+* Regenerate the tests and MANIFEST.json
+
+## How the generator works
+
+This section describes how `spec.src.json` is turned into scenario data in test HTML files which are then processed by JavaScript test helpers and server-side scripts, and describes the objects/types used in the process.
+
+### The spec JSON
+
+`spec.src.json` is the input for the generator that defines what to generate. For examples of spec JSON files, see [referrer-policy/spec.src.json](../../referrer-policy/spec.src.json) or  [mixed-content/spec.src.json](../../mixed-content/spec.src.json).
+
+#### Main sections
+
+* **`specification`**
+
+  Top level requirements with description fields and a ```test_expansion``` rule.
+  This is closely mimicking the [Referrer Policy specification](http://w3c.github.io/webappsec/specs/referrer-policy/) structure.
+
+* **`excluded_tests`**
+
+  List of ```test_expansion``` patterns expanding into selections which get skipped when generating the tests (aka. blocklisting/suppressing)
+
+* **`test_expansion_schema`**
+
+  Provides valid values for each field.
+  Each test expansion can only contain fields and values defined by this schema (or `"*"` values that indicate all the valid values defined this schema).
+
+* **`subresource_schema`**
+
+  Provides metadata of subresources, e.g. supported delivery types for each subresource.
+
+* **`source_context_schema`**
+
+  Provides metadata of each single source context, e.g. supported delivery types and subresources that can be sent from the context.
+
+* **`source_context_list_schema`**
+
+  Provides possible nested combinations of source contexts. See [SourceContexts Resolution](#sourcecontexts-resolution) section below for details.
+
+### Test Expansion Pattern Object
+
+Test expansion patterns (`test_expansion`s in `specification` section) define the combinations of test configurations (*selections*) to be generated.
+Each field in a test expansion can be in one of the following formats:
+
+* Single match: ```"value"```
+
+* Match any of: ```["value1", "value2", ...]```
+
+* Match all: ```"*"```
+
+The following fields have special meaning:
+
+- **`name`**: just ignored. (Previously this was used as a part of filenames but now this is merely a label for human and is never used by generator. This field might be removed in the future (https://github.com/web-platform-tests/wpt/issues/21708))
+- **`expansion`**: if there is more than one pattern expanding into a same selection, the pattern appearing later in the spec JSON will overwrite a previously generated selection. To make clear this is intentional, set the value of the ```expansion``` field to ```default``` for an expansion appearing earlier and ```override``` for the one appearing later.
+
+For example a test expansion pattern (taken from [referrer-policy/spec.src.json](../../referrer-policy/spec.src.json), sorted/formatted for explanation):
+
+```json
+{
+  "name": "insecure-protocol",
+  "expansion": "default",
+
+  "delivery_type": "*",
+  "delivery_value": "no-referrer-when-downgrade",
+  "source_context_list": "*",
+
+  "expectation": "stripped-referrer",
+  "origin": ["same-http", "cross-http"],
+  "redirection": "*",
+  "source_scheme": "http",
+  "subresource": "*"
+}
+```
+
+means: "All combinations with all possible `delivery_type`,  `delivery_value`=`no-referrer-when-downgrade`, all possible `source_context_list`, `expectation`=`stripped-referrer`, `origin`=`same-http` or `cross-http`,  all possible `redirection`, `source_scheme`=`http`, and all possible `subresource`.
+
+### Selection Object
+
+A selection is an object that defines a single test, with keys/values from `test_expansion_schema`.
+
+A single test expansion pattern gets expanded into a list of selections as follows:
+
+* Expand each field's pattern (single, any of, or all) to list of allowed values (defined by the ```test_expansion_schema```)
+
+* Permute - Recursively enumerate all selections across all fields
+
+The following field has special meaning:
+
+- **`delivery_key`**: This doesn't exist in test expansion patterns, and instead is taken from `delivery_key` field of the spec JSON and added into selections. (TODO(https://github.com/web-platform-tests/wpt/issues/21708): probably this should be added to test expansion patterns to remove this special handling)
+
+For example, the test expansion in the example above generates selections like the following selection (which eventually generates [this test file](../../referrer-policy/gen/worker-classic.http-rp/no-referrer-when-downgrade/fetch/same-http.no-redirect.http.html )):
+
+```json
+{
+  "delivery_type": "http-rp",
+  "delivery_key": "referrerPolicy",
+  "delivery_value": "no-referrer-when-downgrade",
+  "source_context_list": "worker-classic",
+
+  "expectation": "stripped-referrer",
+  "origin": "same-http",
+  "redirection": "no-redirect",
+  "source_scheme": "http",
+  "subresource": "fetch"
+}
+```
+
+### Excluding Test Expansion Patterns
+
+The ```excluded_tests``` section have objects with the same format as [Test Expansion Patterns](#test-expansion-patterns) that define selections to be excluded.
+
+Taking the spec JSON, the generator follows this algorithm:
+
+* Expand all ```excluded_tests``` to create a denylist of selections
+
+* For each `specification` entries: Expand the ```test_expansion``` pattern into selections and check each against the denylist, if not marked as suppresed, generate the test resources for the selection
+
+###  SourceContext Resolution
+
+The `source_context_list_schema` section of `spec.src.json` defines templates of policy deliveries and source contexts.
+The `source_context_list` value in a selection specifies the key of the template to be used in `source_context_list_schema`, and the following fields in the selection are filled into the template (these three values define the **target policy delivery** to be tested):
+
+- `delivery_type`
+- `delivery_key`
+- `delivery_value`
+
+#### Source Context List Schema
+
+Each entry of **`source_context_list_schema`**, defines a single template of how/what policies to be delivered in what source contexts (See also [PolicyDelivery](types.md#policydelivery) and [SourceContext](types.md#sourcecontext)).
+
+- The key: the name of the template which matches with the `source_context_list` value in a selection.
+- `sourceContextList`: an array of `SourceContext` objects that represents a (possibly nested) context.
+    - `sourceContextType` of the first entry of `sourceContextList` should be always `"top"`, which represents the top-level generated test HTML. This entry is omitted in the scenario JSON object passed to JavaScript runtime, but the policy deliveries specified here are handled by the generator, e.g. written as `<meta>` elements in the generated test HTML.
+- `subresourcePolicyDeliveries`: an array of `PolicyDelivery` objects that represents policies specified at subresource requests (e.g. `referrerPolicy` attribute of `<img>` elements).
+
+#### PolicyDelivery placeholders
+
+Instead to ordinal `PolicyDelivery` objects, the following placeholder strings can be used in `sourceContextList` or `subresourcePolicyDeliveries`.
+
+- `"policy"`:
+    - Replaced with the target policy delivery.
+- `"policyIfNonNull"`:
+    - Replaced with the target policy delivery, only if `delivery_value` is not `null`.
+      If `delivery_value` is `null`, then the test is not generated.
+- `"anotherPolicy"`:
+    - Replaced with a `PolicyDelivery` object that has a different value from
+      the target policy delivery.
+    - Can be used to specify e.g. a policy that should be overridden by
+      the target policy delivery.
+
+#### `source_context_schema` and `subresource_schema`
+
+These represent supported delivery types and subresources
+for each source context or subresource type. These are used
+
+- To filter out test files for unsupported combinations of delivery types,
+  source contexts and subresources during SourceContext resolution.
+- To determine what delivery types can be used for `anotherPolicy`
+  placeholder.
+
+#### Example
+
+For example, the following entry in `source_context_list_schema`:
+
+```json
+"worker-classic": {
+  "sourceContextList": [
+    {
+      "sourceContextType": "top",
+      "policyDeliveries": [
+        "anotherPolicy"
+      ]
+    },
+    {
+      "sourceContextType": "worker-classic",
+      "policyDeliveries": [
+        "policy"
+      ]
+    }
+  ],
+  "subresourcePolicyDeliveries": []
+}
+```
+
+Defines a template to be instantiated with `delivery_key`, `delivery_type` and `delivery_value` values defined outside `source_context_list_schema`, which reads:
+
+- A classic `WorkerGlobalScope` is created under the top-level Document, and has a policy defined by `delivery_key`, `delivery_type` and `delivery_value`.
+- The top-level Document has a policy different from the policy given to the classic worker (to confirm that the policy of the classic worker, not of the top-level Document, is used).
+- The subresource request is sent from the classic `WorkerGlobalScope`, with no additional policies specified at the subresource request.
+
+And when filled with the following values from a selection:
+
+- `delivery_type`: `"http-rp"`
+- `delivery_key`: `"referrerPolicy"`
+- `delivery_value`: `"no-referrer-when-downgrade"`
+
+This becomes:
+
+```json
+"worker-classic": {
+  "sourceContextList": [
+    {
+      "sourceContextType": "top",
+      "policyDeliveries": [
+        {
+          "deliveryType": "meta",
+          "key": "referrerPolicy",
+          "value": "no-referrer"
+        }
+      ]
+    },
+    {
+      "sourceContextType": "worker-classic",
+      "policyDeliveries": [
+        {
+          "deliveryType": "http-rp",
+          "key": "referrerPolicy",
+          "value": "no-referrer-when-downgrade"
+        }
+      ]
+    }
+  ],
+  "subresourcePolicyDeliveries": []
+}
+```
+
+which means
+
+- The top-level Document has `<meta name="referrer" content="no-referrer">`.
+- The classic worker is created with
+  `Referrer-Policy: no-referrer-when-downgrade` HTTP response headers.
+
+### Scenario Object
+
+The **scenario** object is the JSON object written to the generated HTML files, and passed to JavaScript test runtime (as an argument of `TestCase`).
+A scenario object is an selection object, minus the keys used in [SourceContext Resolution](#sourceContext-resolution):
+
+- `source_context_list`
+- `delivery_type`
+- `delivery_key`
+- `delivery_value`
+
+plus the keys instantiated by [SourceContext Resolution](#sourceContext-resolution):
+
+- `source_context_list`, except for the first `"top"` entry.
+- `subresource_policy_deliveries`
+
+For example:
+
+```json
+{
+  "source_context_list": [
+    {
+      "sourceContextType": "worker-classic",
+      "policyDeliveries": [
+        {
+          "deliveryType": "http-rp",
+          "key": "referrerPolicy",
+          "value": "no-referrer-when-downgrade"
+        }
+      ]
+    }
+  ],
+  "subresource_policy_deliveries": [],
+
+  "expectation": "stripped-referrer",
+  "origin": "same-http",
+  "redirection": "no-redirect",
+  "source_scheme": "http",
+  "subresource": "fetch"
+}
+```
+
+### TopLevelPolicyDelivery Object
+
+The ***TopLevelPolicyDelivery** object is the first `"top"` entry of `SourceContextList` instantiated by [SourceContext Resolution](#sourceContext-resolution), which represents the policy delivery of the top-level HTML Document.
+
+The generator generates `<meta>` elements and `.headers` files of the top-level HTML files from the TopLevelPolicyDelivery object.
+
+This is handled separately by the generator from other parts of selection objects and scenario objects, because the `<meta>` and `.headers` are hard-coded directly to the files in the WPT repository, while policies of subcontexts are generated via server-side `common/security-features/scope` scripts.
+
+TODO(https://github.com/web-platform-tests/wpt/issues/21710): Currently the name `TopLevelPolicyDelivery` doesn't appear in the code.
+
+## How the test runtime works
+
+All the information needed at runtime is contained in an scenario object. See the code/comments of the following files.
+
+- `project-directory/generic/test-case.js` defines `TestCase`, the entry point that receives a scenario object. `resources/common.sub.js` does the most of common JavaScript work.
+    - Subresource URLs (which point to `subresource/` scripts) are calculated from `origin` and `redirection` values.
+    - Initiating fetch requests based on `subresource` and `subresource_policy_deliveries`.
+- `scope/` server-side scripts serve non-toplevel contexts, while the top-level Document is generated by the generator.
+   TODO(https://github.com/web-platform-tests/wpt/issues/21709): Merge the logics of `scope/` and the generator.
+- `subresource/` server-side scripts serve subresource responses.
diff --git a/test/wpt/tests/common/security-features/__init__.py b/test/wpt/tests/common/security-features/__init__.py
new file mode 100644
index 00000000000..e69de29bb2d
diff --git a/test/wpt/tests/common/security-features/resources/common.sub.js b/test/wpt/tests/common/security-features/resources/common.sub.js
new file mode 100644
index 00000000000..96ca280597b
--- /dev/null
+++ b/test/wpt/tests/common/security-features/resources/common.sub.js
@@ -0,0 +1,1311 @@
+/**
+ * @fileoverview Utilities for mixed-content in web-platform-tests.
+ * @author burnik@google.com (Kristijan Burnik)
+ * Disclaimer: Some methods of other authors are annotated in the corresponding
+ *     method's JSDoc.
+ */
+
+// ===============================================================
+// Types
+// ===============================================================
+// Objects of the following types are used to represent what kind of
+// subresource requests should be sent with what kind of policies,
+// from what kind of possibly nested source contexts.
+// The objects are represented as JSON objects (not JavaScript/Python classes
+// in a strict sense) to be passed between JavaScript/Python code.
+//
+// See also common/security-features/Types.md for high-level description.
+
+/**
+  @typedef PolicyDelivery
+  @type {object}
+  Referrer policy etc. can be applied/delivered in several ways.
+  A PolicyDelivery object specifies what policy is delivered and how.
+
+  @property {string} deliveryType
+    Specifies how the policy is delivered.
+    The valid deliveryType are:
+
+     "attr"
+        [A] DOM attributes e.g. referrerPolicy.
+
+      "rel-noref"
+        [A] <link rel="noreferrer"> (referrer-policy only).
+
+      "http-rp"
+        [B] HTTP response headers.
+
+      "meta"
+        [B] <meta> elements.
+
+  @property {string} key
+  @property {string} value
+    Specifies what policy to be delivered. The valid keys are:
+
+      "referrerPolicy"
+        Referrer Policy
+        https://w3c.github.io/webappsec-referrer-policy/
+        Valid values are those listed in
+        https://w3c.github.io/webappsec-referrer-policy/#referrer-policy
+        (except that "" is represented as null/None)
+
+  A PolicyDelivery can be specified in several ways:
+
+  - (for [A]) Associated with an individual subresource request and
+    specified in `Subresource.policies`,
+    e.g. referrerPolicy attributes of DOM elements.
+    This is handled in invokeRequest().
+
+  - (for [B]) Associated with an nested environmental settings object and
+    specified in `SourceContext.policies`,
+    e.g. HTTP referrer-policy response headers of HTML/worker scripts.
+    This is handled in server-side under /common/security-features/scope/.
+
+  - (for [B]) Associated with the top-level HTML document.
+    This is handled by the generators.d
+*/
+
+/**
+  @typedef Subresource
+  @type {object}
+  A Subresource represents how a subresource request is sent.
+
+  @property{SubresourceType} subresourceType
+    How the subresource request is sent,
+    e.g. "img-tag" for sending a request via <img src>.
+    See the keys of `subresourceMap` for valid values.
+
+  @property{string} url
+    subresource's URL.
+    Typically this is constructed by getRequestURLs() below.
+
+  @property{PolicyDelivery} policyDeliveries
+    Policies delivered specific to the subresource request.
+*/
+
+/**
+  @typedef SourceContext
+  @type {object}
+
+  @property {string} sourceContextType
+    Kind of the source context to be used.
+    Valid values are the keys of `sourceContextMap` below.
+
+  @property {Array<PolicyDelivery>} policyDeliveries
+    A list of PolicyDelivery applied to the source context.
+*/
+
+// ===============================================================
+// General utility functions
+// ===============================================================
+
+function timeoutPromise(t, ms) {
+  return new Promise(resolve => { t.step_timeout(resolve, ms); });
+}
+
+/**
+ * Normalizes the target port for use in a URL. For default ports, this is the
+ *     empty string (omitted port), otherwise it's a colon followed by the port
+ *     number. Ports 80, 443 and an empty string are regarded as default ports.
+ * @param {number} targetPort The port to use
+ * @return {string} The port portion for using as part of a URL.
+ */
+function getNormalizedPort(targetPort) {
+  return ([80, 443, ""].indexOf(targetPort) >= 0) ? "" : ":" + targetPort;
+}
+
+/**
+ * Creates a GUID.
+ *     See: https://en.wikipedia.org/wiki/Globally_unique_identifier
+ *     Original author: broofa (http://www.broofa.com/)
+ *     Sourced from: http://stackoverflow.com/a/2117523/4949715
+ * @return {string} A pseudo-random GUID.
+ */
+function guid() {
+  return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function(c) {
+    var r = Math.random() * 16 | 0, v = c == 'x' ? r : (r & 0x3 | 0x8);
+    return v.toString(16);
+  });
+}
+
+/**
+ * Initiates a new XHR via GET.
+ * @param {string} url The endpoint URL for the XHR.
+ * @param {string} responseType Optional - how should the response be parsed.
+ *     Default is "json".
+ *     See: https://xhr.spec.whatwg.org/#dom-xmlhttprequest-responsetype
+ * @return {Promise} A promise wrapping the success and error events.
+ */
+function xhrRequest(url, responseType) {
+  return new Promise(function(resolve, reject) {
+    var xhr = new XMLHttpRequest();
+    xhr.open('GET', url, true);
+    xhr.responseType = responseType || "json";
+
+    xhr.addEventListener("error", function() {
+      reject(Error("Network Error"));
+    });
+
+    xhr.addEventListener("load", function() {
+      if (xhr.status != 200)
+        reject(Error(xhr.statusText));
+      else
+        resolve(xhr.response);
+    });
+
+    xhr.send();
+  });
+}
+
+/**
+ * Sets attributes on a given DOM element.
+ * @param {DOMElement} element The element on which to set the attributes.
+ * @param {object} An object with keys (serving as attribute names) and values.
+ */
+function setAttributes(el, attrs) {
+  attrs = attrs || {}
+  for (var attr in attrs) {
+    if (attr !== 'src')
+      el.setAttribute(attr, attrs[attr]);
+  }
+  // Workaround for Chromium: set <img>'s src attribute after all other
+  // attributes to ensure the policy is applied.
+  for (var attr in attrs) {
+    if (attr === 'src')
+      el.setAttribute(attr, attrs[attr]);
+  }
+}
+
+/**
+ * Binds to success and error events of an object wrapping them into a promise
+ *     available through {@code element.eventPromise}. The success event
+ *     resolves and error event rejects.
+ * This method adds event listeners, and then removes all the added listeners
+ * when one of listened event is fired.
+ * @param {object} element An object supporting events on which to bind the
+ *     promise.
+ * @param {string} resolveEventName [="load"] The event name to bind resolve to.
+ * @param {string} rejectEventName [="error"] The event name to bind reject to.
+ */
+function bindEvents(element, resolveEventName, rejectEventName) {
+  element.eventPromise =
+      bindEvents2(element, resolveEventName, element, rejectEventName);
+}
+
+// Returns a promise wrapping success and error events of objects.
+// This is a variant of bindEvents that can accept separate objects for each
+// events and two events to reject, and doesn't set `eventPromise`.
+//
+// When `resolveObject`'s `resolveEventName` event (default: "load") is
+// fired, the promise is resolved with the event.
+//
+// When `rejectObject`'s `rejectEventName` event (default: "error") or
+// `rejectObject2`'s `rejectEventName2` event (default: "error") is
+// fired, the promise is rejected.
+//
+// `rejectObject2` is optional.
+function bindEvents2(resolveObject, resolveEventName, rejectObject, rejectEventName, rejectObject2, rejectEventName2) {
+  return new Promise(function(resolve, reject) {
+    const actualResolveEventName = resolveEventName || "load";
+    const actualRejectEventName = rejectEventName || "error";
+    const actualRejectEventName2 = rejectEventName2 || "error";
+
+    const resolveHandler = function(event) {
+      cleanup();
+      resolve(event);
+    };
+
+    const rejectHandler = function(event) {
+      // Chromium starts propagating errors from worker.onerror to
+      // window.onerror. This handles the uncaught exceptions in tests.
+      event.preventDefault();
+      cleanup();
+      reject(event);
+    };
+
+    const cleanup = function() {
+      resolveObject.removeEventListener(actualResolveEventName, resolveHandler);
+      rejectObject.removeEventListener(actualRejectEventName, rejectHandler);
+      if (rejectObject2) {
+        rejectObject2.removeEventListener(actualRejectEventName2, rejectHandler);
+      }
+    };
+
+    resolveObject.addEventListener(actualResolveEventName, resolveHandler);
+    rejectObject.addEventListener(actualRejectEventName, rejectHandler);
+    if (rejectObject2) {
+      rejectObject2.addEventListener(actualRejectEventName2, rejectHandler);
+    }
+  });
+}
+
+/**
+ * Creates a new DOM element.
+ * @param {string} tagName The type of the DOM element.
+ * @param {object} attrs A JSON with attributes to apply to the element.
+ * @param {DOMElement} parent Optional - an existing DOM element to append to
+ *     If not provided, the returned element will remain orphaned.
+ * @param {boolean} doBindEvents Optional - Whether to bind to load and error
+ *     events and provide the promise wrapping the events via the element's
+ *     {@code eventPromise} property. Default value evaluates to false.
+ * @return {DOMElement} The newly created DOM element.
+ */
+function createElement(tagName, attrs, parentNode, doBindEvents) {
+  var element = document.createElement(tagName);
+
+  if (doBindEvents) {
+    bindEvents(element);
+    if (element.tagName == "IFRAME" && !('srcdoc' in attrs || 'src' in attrs)) {
+      // If we're loading a frame, ensure we spin the event loop after load to
+      // paper over the different event timing in Gecko vs Blink/WebKit
+      // see https://github.com/whatwg/html/issues/4965
+      element.eventPromise = element.eventPromise.then(() => {
+        return new Promise(resolve => setTimeout(resolve, 0))
+      });
+    }
+  }
+  // We set the attributes after binding to events to catch any
+  // event-triggering attribute changes. E.g. form submission.
+  //
+  // But be careful with images: unlike other elements they will start the load
+  // as soon as the attr is set, even if not in the document yet, and sometimes
+  // complete it synchronously, so the append doesn't have the effect we want.
+  // So for images, we want to set the attrs after appending, whereas for other
+  // elements we want to do it before appending.
+  var isImg = (tagName == "img");
+  if (!isImg)
+    setAttributes(element, attrs);
+
+  if (parentNode)
+    parentNode.appendChild(element);
+
+  if (isImg)
+    setAttributes(element, attrs);
+
+  return element;
+}
+
+function createRequestViaElement(tagName, attrs, parentNode) {
+  return createElement(tagName, attrs, parentNode, true).eventPromise;
+}
+
+function wrapResult(server_data) {
+  if (typeof(server_data) === "string") {
+    throw server_data;
+  }
+  return {
+    referrer: server_data.headers.referer,
+    headers: server_data.headers
+  }
+}
+
+// ===============================================================
+// Subresources
+// ===============================================================
+
+/**
+  @typedef RequestResult
+  @type {object}
+  Represents the result of sending an request.
+  All properties are optional. See the comments for
+  requestVia*() and invokeRequest() below to see which properties are set.
+
+  @property {Array<Object<string, string>>} headers
+    HTTP request headers sent to server.
+  @property {string} referrer - Referrer.
+  @property {string} location - The URL of the subresource.
+  @property {string} sourceContextUrl
+    the URL of the global object where the actual request is sent.
+*/
+
+/**
+  requestVia*(url, additionalAttributes) functions send a subresource
+  request from the current environment settings object.
+
+  @param {string} url
+    The URL of the subresource.
+  @param {Object<string, string>} additionalAttributes
+    Additional attributes set to DOM elements
+    (element-initiated requests only).
+
+  @returns {Promise} that are resolved with a RequestResult object
+  on successful requests.
+
+  - Category 1:
+      `headers`: set.
+      `referrer`: set via `document.referrer`.
+      `location`: set via `document.location`.
+      See `template/document.html.template`.
+  - Category 2:
+      `headers`: set.
+      `referrer`: set to `headers.referer` by `wrapResult()`.
+      `location`: not set.
+  - Category 3:
+      All the keys listed above are NOT set.
+  `sourceContextUrl` is not set here.
+
+  -------------------------------- -------- --------------------------
+  Function name                    Category Used in
+                                            -------- ------- ---------
+                                            referrer mixed-  upgrade-
+                                            policy   content insecure-
+                                            policy   content request
+  -------------------------------- -------- -------- ------- ---------
+  requestViaAnchor                 1        Y        Y       -
+  requestViaArea                   1        Y        Y       -
+  requestViaAudio                  3        -        Y       -
+  requestViaDedicatedWorker        2        Y        Y       Y
+  requestViaFetch                  2        Y        Y       -
+  requestViaForm                   2        -        Y       -
+  requestViaIframe                 1        Y        Y       -
+  requestViaImage                  2        Y        Y       -
+  requestViaLinkPrefetch           3        -        Y       -
+  requestViaLinkStylesheet         3        -        Y       -
+  requestViaObject                 3        -        Y       -
+  requestViaPicture                3        -        Y       -
+  requestViaScript                 2        Y        Y       -
+  requestViaSendBeacon             3        -        Y       -
+  requestViaSharedWorker           2        Y        Y       Y
+  requestViaVideo                  3        -        Y       -
+  requestViaWebSocket              3        -        Y       -
+  requestViaWorklet                3        -        Y       Y
+  requestViaXhr                    2        Y        Y       -
+  -------------------------------- -------- -------- ------- ---------
+*/
+
+/**
+ * Creates a new iframe, binds load and error events, sets the src attribute and
+ *     appends it to {@code document.body} .
+ * @param {string} url The src for the iframe.
+ * @return {Promise} The promise for success/error events.
+ */
+function requestViaIframe(url, additionalAttributes) {
+  const iframe = createElement(
+      "iframe",
+      Object.assign({"src": url}, additionalAttributes),
+      document.body,
+      false);
+  return bindEvents2(window, "message", iframe, "error", window, "error")
+      .then(event => {
+          if (event.source !== iframe.contentWindow)
+            return Promise.reject(new Error('Unexpected event.source'));
+          return event.data;
+        });
+}
+
+/**
+ * Creates a new image, binds load and error events, sets the src attribute and
+ *     appends it to {@code document.body} .
+ * @param {string} url The src for the image.
+ * @return {Promise} The promise for success/error events.
+ */
+function requestViaImage(url, additionalAttributes) {
+  const img = createElement(
+      "img",
+      // crossOrigin attribute is added to read the pixel data of the response.
+      Object.assign({"src": url, "crossOrigin": "Anonymous"}, additionalAttributes),
+      document.body, true);
+  return img.eventPromise.then(() => wrapResult(decodeImageData(img)));
+}
+
+// Helper for requestViaImage().
+function decodeImageData(img) {
+  var canvas = document.createElement("canvas");
+  var context = canvas.getContext('2d');
+  context.drawImage(img, 0, 0);
+  var imgData = context.getImageData(0, 0, img.clientWidth, img.clientHeight);
+  const rgba = imgData.data;
+
+  let decodedBytes = new Uint8ClampedArray(rgba.length);
+  let decodedLength = 0;
+
+  for (var i = 0; i + 12 <= rgba.length; i += 12) {
+    // A single byte is encoded in three pixels. 8 pixel octets (among
+    // 9 octets = 3 pixels * 3 channels) are used to encode 8 bits,
+    // the most significant bit first, where `0` and `255` in pixel values
+    // represent `0` and `1` in bits, respectively.
+    // This encoding is used to avoid errors due to different color spaces.
+    const bits = [];
+    for (let j = 0; j < 3; ++j) {
+      bits.push(rgba[i + j * 4 + 0]);
+      bits.push(rgba[i + j * 4 + 1]);
+      bits.push(rgba[i + j * 4 + 2]);
+      // rgba[i + j * 4 + 3]: Skip alpha channel.
+    }
+    // The last one element is not used.
+    bits.pop();
+
+    // Decode a single byte.
+    let byte = 0;
+    for (let j = 0; j < 8; ++j) {
+      byte <<= 1;
+      if (bits[j] >= 128)
+        byte |= 1;
+    }
+
+    // Zero is the string terminator.
+    if (byte == 0)
+      break;
+
+    decodedBytes[decodedLength++] = byte;
+  }
+
+  // Remove trailing nulls from data.
+  decodedBytes = decodedBytes.subarray(0, decodedLength);
+  var string_data = (new TextDecoder("ascii")).decode(decodedBytes);
+
+  return JSON.parse(string_data);
+}
+
+/**
+ * Initiates a new XHR GET request to provided URL.
+ * @param {string} url The endpoint URL for the XHR.
+ * @return {Promise} The promise for success/error events.
+ */
+function requestViaXhr(url) {
+  return xhrRequest(url).then(result => wrapResult(result));
+}
+
+/**
+ * Initiates a new GET request to provided URL via the Fetch API.
+ * @param {string} url The endpoint URL for the Fetch.
+ * @return {Promise} The promise for success/error events.
+ */
+function requestViaFetch(url) {
+  return fetch(url)
+    .then(res => res.json())
+    .then(j => wrapResult(j));
+}
+
+function dedicatedWorkerUrlThatFetches(url) {
+  return `data:text/javascript,
+    fetch('${url}')
+      .then(r => r.json())
+      .then(j => postMessage(j))
+      .catch((e) => postMessage(e.message));`;
+}
+
+function workerUrlThatImports(url, additionalAttributes) {
+  let csp = "";
+  if (additionalAttributes && additionalAttributes.contentSecurityPolicy) {
+    csp=`&contentSecurityPolicy=${additionalAttributes.contentSecurityPolicy}`;
+  }
+  return `/common/security-features/subresource/static-import.py` +
+      `?import_url=${encodeURIComponent(url)}${csp}`;
+}
+
+function workerDataUrlThatImports(url) {
+  return `data:text/javascript,import '${url}';`;
+}
+
+/**
+ * Creates a new Worker, binds message and error events wrapping them into.
+ *     {@code worker.eventPromise} and posts an empty string message to start
+ *     the worker.
+ * @param {string} url The endpoint URL for the worker script.
+ * @param {object} options The options for Worker constructor.
+ * @return {Promise} The promise for success/error events.
+ */
+function requestViaDedicatedWorker(url, options) {
+  var worker;
+  try {
+    worker = new Worker(url, options);
+  } catch (e) {
+    return Promise.reject(e);
+  }
+  worker.postMessage('');
+  return bindEvents2(worker, "message", worker, "error")
+    .then(event => wrapResult(event.data));
+}
+
+function requestViaSharedWorker(url, options) {
+  var worker;
+  try {
+    worker = new SharedWorker(url, options);
+  } catch(e) {
+    return Promise.reject(e);
+  }
+  const promise = bindEvents2(worker.port, "message", worker, "error")
+    .then(event => wrapResult(event.data));
+  worker.port.start();
+  return promise;
+}
+
+// Returns a reference to a worklet object corresponding to a given type.
+function get_worklet(type) {
+  if (type == 'animation')
+    return CSS.animationWorklet;
+  if (type == 'layout')
+    return CSS.layoutWorklet;
+  if (type == 'paint')
+    return CSS.paintWorklet;
+  if (type == 'audio')
+    return new OfflineAudioContext(2,44100*40,44100).audioWorklet;
+
+  throw new Error('unknown worklet type is passed.');
+}
+
+function requestViaWorklet(type, url) {
+  try {
+    return get_worklet(type).addModule(url);
+  } catch (e) {
+    return Promise.reject(e);
+  }
+}
+
+/**
+ * Creates a navigable element with the name `navigableElementName`
+ * (<a>, <area>, or <form>) under `parentNode`, and
+ * performs a navigation by `trigger()` (e.g. clicking <a>).
+ * To avoid navigating away from the current execution context,
+ * a target attribute is set to point to a new helper iframe.
+ * @param {string} navigableElementName
+ * @param {object} additionalAttributes The attributes of the navigable element.
+ * @param {DOMElement} parentNode
+ * @param {function(DOMElement} trigger A callback called after the navigable
+ * element is inserted and should trigger navigation using the element.
+ * @return {Promise} The promise for success/error events.
+ */
+function requestViaNavigable(navigableElementName, additionalAttributes,
+                             parentNode, trigger) {
+  const name = guid();
+
+  const iframe =
+    createElement("iframe", {"name": name, "id": name}, parentNode, false);
+
+  const navigable = createElement(
+      navigableElementName,
+      Object.assign({"target": name}, additionalAttributes),
+      parentNode, false);
+
+  const promise =
+    bindEvents2(window, "message", iframe, "error", window, "error")
+      .then(event => {
+          if (event.source !== iframe.contentWindow)
+            return Promise.reject(new Error('Unexpected event.source'));
+          return event.data;
+        });
+  trigger(navigable);
+  return promise;
+}
+
+/**
+ * Creates a new anchor element, appends it to {@code document.body} and
+ *     performs the navigation.
+ * @param {string} url The URL to navigate to.
+ * @return {Promise} The promise for success/error events.
+ */
+function requestViaAnchor(url, additionalAttributes) {
+  return requestViaNavigable(
+      "a",
+      Object.assign({"href": url, "innerHTML": "Link to resource"},
+                    additionalAttributes),
+      document.body, a => a.click());
+}
+
+/**
+ * Creates a new area element, appends it to {@code document.body} and performs
+ *     the navigation.
+ * @param {string} url The URL to navigate to.
+ * @return {Promise} The promise for success/error events.
+ */
+function requestViaArea(url, additionalAttributes) {
+  // TODO(kristijanburnik): Append to map and add image.
+  return requestViaNavigable(
+      "area",
+      Object.assign({"href": url}, additionalAttributes),
+      document.body, area => area.click());
+}
+
+/**
+ * Creates a new script element, sets the src to url, and appends it to
+ *     {@code document.body}.
+ * @param {string} url The src URL.
+ * @return {Promise} The promise for success/error events.
+ */
+function requestViaScript(url, additionalAttributes) {
+  const script = createElement(
+      "script",
+      Object.assign({"src": url}, additionalAttributes),
+      document.body,
+      false);
+
+  return bindEvents2(window, "message", script, "error", window, "error")
+    .then(event => wrapResult(event.data));
+}
+
+/**
+ * Creates a new script element that performs a dynamic import to `url`, and
+ * appends the script element to {@code document.body}.
+ * @param {string} url The src URL.
+ * @return {Promise} The promise for success/error events.
+ */
+function requestViaDynamicImport(url, additionalAttributes) {
+  const scriptUrl = `data:text/javascript,import("${url}");`;
+  const script = createElement(
+      "script",
+      Object.assign({"src": scriptUrl}, additionalAttributes),
+      document.body,
+      false);
+
+  return bindEvents2(window, "message", script, "error", window, "error")
+    .then(event => wrapResult(event.data));
+}
+
+/**
+ * Creates a new form element, sets attributes, appends it to
+ *     {@code document.body} and submits the form.
+ * @param {string} url The URL to submit to.
+ * @return {Promise} The promise for success/error events.
+ */
+function requestViaForm(url, additionalAttributes) {
+  return requestViaNavigable(
+      "form",
+      Object.assign({"action": url, "method": "POST"}, additionalAttributes),
+      document.body, form => form.submit());
+}
+
+/**
+ * Creates a new link element for a stylesheet, binds load and error events,
+ *     sets the href to url and appends it to {@code document.head}.
+ * @param {string} url The URL for a stylesheet.
+ * @return {Promise} The promise for success/error events.
+ */
+function requestViaLinkStylesheet(url) {
+  return createRequestViaElement("link",
+                                 {"rel": "stylesheet", "href": url},
+                                 document.head);
+}
+
+/**
+ * Creates a new link element for a prefetch, binds load and error events, sets
+ *     the href to url and appends it to {@code document.head}.
+ * @param {string} url The URL of a resource to prefetch.
+ * @return {Promise} The promise for success/error events.
+ */
+function requestViaLinkPrefetch(url) {
+  var link = document.createElement('link');
+  if (link.relList && link.relList.supports && link.relList.supports("prefetch")) {
+    return createRequestViaElement("link",
+                                   {"rel": "prefetch", "href": url},
+                                   document.head);
+  } else {
+    return Promise.reject("This browser does not support 'prefetch'.");
+  }
+}
+
+/**
+ * Initiates a new beacon request.
+ * @param {string} url The URL of a resource to prefetch.
+ * @return {Promise} The promise for success/error events.
+ */
+async function requestViaSendBeacon(url) {
+  function wait(ms) {
+    return new Promise(resolve => step_timeout(resolve, ms));
+  }
+  if (!navigator.sendBeacon(url)) {
+    // If mixed-content check fails, it should return false.
+    throw new Error('sendBeacon() fails.');
+  }
+  // We don't have a means to see the result of sendBeacon() request
+  // for sure. Let's wait for a while and let the generic test function
+  // ask the server for the result.
+  await wait(500);
+  return 'allowed';
+}
+
+/**
+ * Creates a new media element with a child source element, binds loadeddata and
+ *     error events, sets attributes and appends to document.body.
+ * @param {string} type The type of the media element (audio/video/picture).
+ * @param {object} media_attrs The attributes for the media element.
+ * @param {object} source_attrs The attributes for the child source element.
+ * @return {DOMElement} The newly created media element.
+ */
+function createMediaElement(type, media_attrs, source_attrs) {
+  var mediaElement = createElement(type, {});
+
+  var sourceElement = createElement("source", {});
+
+  mediaElement.eventPromise = new Promise(function(resolve, reject) {
+    mediaElement.addEventListener("loadeddata", function (e) {
+      resolve(e);
+    });
+
+    // Safari doesn't fire an `error` event when blocking mixed content.
+    mediaElement.addEventListener("stalled", function(e) {
+      reject(e);
+    });
+
+    sourceElement.addEventListener("error", function(e) {
+      reject(e);
+    });
+  });
+
+  setAttributes(mediaElement, media_attrs);
+  setAttributes(sourceElement, source_attrs);
+
+  mediaElement.appendChild(sourceElement);
+  document.body.appendChild(mediaElement);
+
+  return mediaElement;
+}
+
+/**
+ * Creates a new video element, binds loadeddata and error events, sets
+ *     attributes and source URL and appends to {@code document.body}.
+ * @param {string} url The URL of the video.
+ * @return {Promise} The promise for success/error events.
+ */
+function requestViaVideo(url) {
+  return createMediaElement("video",
+                            {},
+                            {"src": url}).eventPromise;
+}
+
+/**
+ * Creates a new audio element, binds loadeddata and error events, sets
+ *     attributes and source URL and appends to {@code document.body}.
+ * @param {string} url The URL of the audio.
+ * @return {Promise} The promise for success/error events.
+ */
+function requestViaAudio(url) {
+  return createMediaElement("audio",
+                            {},
+                            {"type": "audio/wav", "src": url}).eventPromise;
+}
+
+/**
+ * Creates a new picture element, binds loadeddata and error events, sets
+ *     attributes and source URL and appends to {@code document.body}. Also
+ *     creates new image element appending it to the picture
+ * @param {string} url The URL of the image for the source and image elements.
+ * @return {Promise} The promise for success/error events.
+ */
+function requestViaPicture(url) {
+  var picture = createMediaElement("picture", {}, {"srcset": url,
+                                                "type": "image/png"});
+  return createRequestViaElement("img", {"src": url}, picture);
+}
+
+/**
+ * Creates a new object element, binds load and error events, sets the data to
+ *     url, and appends it to {@code document.body}.
+ * @param {string} url The data URL.
+ * @return {Promise} The promise for success/error events.
+ */
+function requestViaObject(url) {
+  return createRequestViaElement("object", {"data": url, "type": "text/html"}, document.body);
+}
+
+/**
+ * Creates a new WebSocket pointing to {@code url} and sends a message string
+ * "echo". The {@code message} and {@code error} events are triggering the
+ * returned promise resolve/reject events.
+ * @param {string} url The URL for WebSocket to connect to.
+ * @return {Promise} The promise for success/error events.
+ */
+function requestViaWebSocket(url) {
+  return new Promise(function(resolve, reject) {
+    var websocket = new WebSocket(url);
+
+    websocket.addEventListener("message", function(e) {
+      resolve(e.data);
+    });
+
+    websocket.addEventListener("open", function(e) {
+      websocket.send("echo");
+    });
+
+    websocket.addEventListener("error", function(e) {
+      reject(e)
+    });
+  })
+  .then(data => {
+      return JSON.parse(data);
+    });
+}
+
+/**
+  @typedef SubresourceType
+  @type {string}
+
+  Represents how a subresource is sent.
+  The keys of `subresourceMap` below are the valid values.
+*/
+
+// Subresource paths and invokers.
+const subresourceMap = {
+  "a-tag": {
+    path: "/common/security-features/subresource/document.py",
+    invoker: requestViaAnchor,
+  },
+  "area-tag": {
+    path: "/common/security-features/subresource/document.py",
+    invoker: requestViaArea,
+  },
+  "audio-tag": {
+    path: "/common/security-features/subresource/audio.py",
+    invoker: requestViaAudio,
+  },
+  "beacon": {
+    path: "/common/security-features/subresource/empty.py",
+    invoker: requestViaSendBeacon,
+  },
+  "fetch": {
+    path: "/common/security-features/subresource/xhr.py",
+    invoker: requestViaFetch,
+  },
+  "form-tag": {
+    path: "/common/security-features/subresource/document.py",
+    invoker: requestViaForm,
+  },
+  "iframe-tag": {
+    path: "/common/security-features/subresource/document.py",
+    invoker: requestViaIframe,
+  },
+  "img-tag": {
+    path: "/common/security-features/subresource/image.py",
+    invoker: requestViaImage,
+  },
+  "link-css-tag": {
+    path: "/common/security-features/subresource/empty.py",
+    invoker: requestViaLinkStylesheet,
+  },
+  "link-prefetch-tag": {
+    path: "/common/security-features/subresource/empty.py",
+    invoker: requestViaLinkPrefetch,
+  },
+  "object-tag": {
+    path: "/common/security-features/subresource/empty.py",
+    invoker: requestViaObject,
+  },
+  "picture-tag": {
+    path: "/common/security-features/subresource/image.py",
+    invoker: requestViaPicture,
+  },
+  "script-tag": {
+    path: "/common/security-features/subresource/script.py",
+    invoker: requestViaScript,
+  },
+  "script-tag-dynamic-import": {
+    path: "/common/security-features/subresource/script.py",
+    invoker: requestViaDynamicImport,
+  },
+  "video-tag": {
+    path: "/common/security-features/subresource/video.py",
+    invoker: requestViaVideo,
+  },
+  "xhr": {
+    path: "/common/security-features/subresource/xhr.py",
+    invoker: requestViaXhr,
+  },
+
+  "worker-classic": {
+    path: "/common/security-features/subresource/worker.py",
+    invoker: url => requestViaDedicatedWorker(url),
+  },
+  "worker-module": {
+    path: "/common/security-features/subresource/worker.py",
+    invoker: url => requestViaDedicatedWorker(url, {type: "module"}),
+  },
+  "worker-import": {
+    path: "/common/security-features/subresource/worker.py",
+    invoker: (url, additionalAttributes) =>
+        requestViaDedicatedWorker(workerUrlThatImports(url, additionalAttributes), {type: "module"}),
+  },
+  "worker-import-data": {
+    path: "/common/security-features/subresource/worker.py",
+    invoker: url =>
+        requestViaDedicatedWorker(workerDataUrlThatImports(url), {type: "module"}),
+  },
+  "sharedworker-classic": {
+    path: "/common/security-features/subresource/shared-worker.py",
+    invoker: url => requestViaSharedWorker(url),
+  },
+  "sharedworker-module": {
+    path: "/common/security-features/subresource/shared-worker.py",
+    invoker: url => requestViaSharedWorker(url, {type: "module"}),
+  },
+  "sharedworker-import": {
+    path: "/common/security-features/subresource/shared-worker.py",
+    invoker: (url, additionalAttributes) =>
+        requestViaSharedWorker(workerUrlThatImports(url, additionalAttributes), {type: "module"}),
+  },
+  "sharedworker-import-data": {
+    path: "/common/security-features/subresource/shared-worker.py",
+    invoker: url =>
+        requestViaSharedWorker(workerDataUrlThatImports(url), {type: "module"}),
+  },
+
+  "websocket": {
+    path: "/stash_responder",
+    invoker: requestViaWebSocket,
+  },
+};
+for (const workletType of ['animation', 'audio', 'layout', 'paint']) {
+  subresourceMap[`worklet-${workletType}`] = {
+      path: "/common/security-features/subresource/worker.py",
+      invoker: url => requestViaWorklet(workletType, url)
+    };
+  subresourceMap[`worklet-${workletType}-import-data`] = {
+      path: "/common/security-features/subresource/worker.py",
+      invoker: url =>
+          requestViaWorklet(workletType, workerDataUrlThatImports(url))
+    };
+}
+
+/**
+  @typedef RedirectionType
+  @type {string}
+
+  Represents what redirects should occur to the subresource request
+  after initial request.
+  See preprocess_redirection() in
+  /common/security-features/subresource/subresource.py for valid values.
+*/
+
+/**
+  Construct subresource (and related) origin.
+
+  @param {string} originType
+  @returns {object} the origin of the subresource.
+*/
+function getSubresourceOrigin(originType) {
+  const httpProtocol = "http";
+  const httpsProtocol = "https";
+  const wsProtocol = "ws";
+  const wssProtocol = "wss";
+
+  const sameOriginHost = "{{host}}";
+  const crossOriginHost = "{{domains[www1]}}";
+
+  // These values can evaluate to either empty strings or a ":port" string.
+  const httpPort = getNormalizedPort(parseInt("{{ports[http][0]}}", 10));
+  const httpsRawPort = parseInt("{{ports[https][0]}}", 10);
+  const httpsPort = getNormalizedPort(httpsRawPort);
+  const wsPort = getNormalizedPort(parseInt("{{ports[ws][0]}}", 10));
+  const wssRawPort = parseInt("{{ports[wss][0]}}", 10);
+  const wssPort = getNormalizedPort(wssRawPort);
+
+  /**
+    @typedef OriginType
+    @type {string}
+
+    Represents the origin of the subresource request URL.
+    The keys of `originMap` below are the valid values.
+
+    Note that there can be redirects from the specified origin
+    (see RedirectionType), and thus the origin of the subresource
+    response URL might be different from what is specified by OriginType.
+  */
+  const originMap = {
+    "same-https": httpsProtocol + "://" + sameOriginHost + httpsPort,
+    "same-http": httpProtocol + "://" + sameOriginHost + httpPort,
+    "cross-https": httpsProtocol + "://" + crossOriginHost + httpsPort,
+    "cross-http": httpProtocol + "://" + crossOriginHost + httpPort,
+    "same-wss": wssProtocol + "://" + sameOriginHost + wssPort,
+    "same-ws": wsProtocol + "://" + sameOriginHost + wsPort,
+    "cross-wss": wssProtocol + "://" + crossOriginHost + wssPort,
+    "cross-ws": wsProtocol + "://" + crossOriginHost + wsPort,
+
+    // The following origin types are used for upgrade-insecure-requests tests:
+    // These rely on some unintuitive cleverness due to WPT's test setup:
+    // 'Upgrade-Insecure-Requests' does not upgrade the port number,
+    // so we use URLs in the form `http://[domain]:[https-port]`,
+    // which will be upgraded to `https://[domain]:[https-port]`.
+    // If the upgrade fails, the load will fail, as we don't serve HTTP over
+    // the secure port.
+    "same-http-downgrade":
+        httpProtocol + "://" + sameOriginHost + ":" + httpsRawPort,
+    "cross-http-downgrade":
+        httpProtocol + "://" + crossOriginHost + ":" + httpsRawPort,
+    "same-ws-downgrade":
+        wsProtocol + "://" + sameOriginHost + ":" + wssRawPort,
+    "cross-ws-downgrade":
+        wsProtocol + "://" + crossOriginHost + ":" + wssRawPort,
+  };
+
+  return originMap[originType];
+}
+
+/**
+  Construct subresource (and related) URLs.
+
+  @param {SubresourceType} subresourceType
+  @param {OriginType} originType
+  @param {RedirectionType} redirectionType
+  @returns {object} with following properties:
+    {string} testUrl
+      The subresource request URL.
+    {string} announceUrl
+    {string} assertUrl
+      The URLs to be used for detecting whether `testUrl` is actually sent
+      to the server.
+      1. Fetch `announceUrl` first,
+      2. then possibly fetch `testUrl`, and
+      3. finally fetch `assertUrl`.
+         The fetch result of `assertUrl` should indicate whether
+         `testUrl` is actually sent to the server or not.
+*/
+function getRequestURLs(subresourceType, originType, redirectionType) {
+  const key = guid();
+  const value = guid();
+
+  // We use the same stash path for both HTTP/S and WS/S stash requests.
+  const stashPath = encodeURIComponent("/mixed-content");
+
+  const stashEndpoint = "/common/security-features/subresource/xhr.py?key=" +
+                        key + "&path=" + stashPath;
+  return {
+    testUrl:
+      getSubresourceOrigin(originType) +
+        subresourceMap[subresourceType].path +
+        "?redirection=" + encodeURIComponent(redirectionType) +
+        "&action=purge&key=" + key +
+        "&path=" + stashPath,
+    announceUrl: stashEndpoint + "&action=put&value=" + value,
+    assertUrl: stashEndpoint + "&action=take",
+  };
+}
+
+// ===============================================================
+// Source Context
+// ===============================================================
+// Requests can be sent from several source contexts,
+// such as the main documents, iframes, workers, or so,
+// possibly nested, and possibly with <meta>/http headers added.
+// invokeRequest() and invokeFrom*() functions handles
+// SourceContext-related setup in client-side.
+
+/**
+  invokeRequest() invokes a subresource request
+  (specified as `subresource`)
+  from a (possibly nested) environment settings object
+  (specified as `sourceContextList`).
+
+  For nested contexts, invokeRequest() calls an invokeFrom*() function
+  that creates a nested environment settings object using
+  /common/security-features/scope/, which calls invokeRequest()
+  again inside the nested environment settings object.
+  This cycle continues until all specified
+  nested environment settings object are created, and
+  finally invokeRequest() calls a requestVia*() function to start the
+  subresource request from the inner-most environment settings object.
+
+  @param {Subresource} subresource
+  @param {Array<SourceContext>} sourceContextList
+
+  @returns {Promise} A promise that is resolved with an RequestResult object.
+  `sourceContextUrl` is always set. For whether other properties are set,
+  see the comments for requestVia*() above.
+*/
+function invokeRequest(subresource, sourceContextList) {
+  if (sourceContextList.length === 0) {
+    // No further nested global objects. Send the subresource request here.
+
+    const additionalAttributes = {};
+    /** @type {PolicyDelivery} policyDelivery */
+    for (const policyDelivery of (subresource.policyDeliveries || [])) {
+      // Depending on the delivery method, extend the subresource element with
+      // these attributes.
+      if (policyDelivery.deliveryType === "attr") {
+        additionalAttributes[policyDelivery.key] = policyDelivery.value;
+      } else if (policyDelivery.deliveryType === "rel-noref") {
+        additionalAttributes["rel"] = "noreferrer";
+      } else if (policyDelivery.deliveryType === "http-rp") {
+        additionalAttributes[policyDelivery.key] = policyDelivery.value;
+      } else if (policyDelivery.deliveryType === "meta") {
+        additionalAttributes[policyDelivery.key] = policyDelivery.value;
+      }
+    }
+
+    return subresourceMap[subresource.subresourceType].invoker(
+        subresource.url,
+        additionalAttributes)
+      .then(result => Object.assign(
+          {sourceContextUrl: location.toString()},
+          result));
+  }
+
+  // Defines invokers for each valid SourceContext.sourceContextType.
+  const sourceContextMap = {
+    "srcdoc": { // <iframe srcdoc></iframe>
+      invoker: invokeFromIframe,
+    },
+    "iframe": { // <iframe src="same-origin-URL"></iframe>
+      invoker: invokeFromIframe,
+    },
+    "iframe-blank": { // <iframe></iframe>
+      invoker: invokeFromIframe,
+    },
+    "worker-classic": {
+      // Classic dedicated worker loaded from same-origin.
+      invoker: invokeFromWorker.bind(undefined, "worker", false, {}),
+    },
+    "worker-classic-data": {
+      // Classic dedicated worker loaded from data: URL.
+      invoker: invokeFromWorker.bind(undefined, "worker", true, {}),
+    },
+    "worker-module": {
+      // Module dedicated worker loaded from same-origin.
+      invoker: invokeFromWorker.bind(undefined, "worker", false, {type: 'module'}),
+    },
+    "worker-module-data": {
+      // Module dedicated worker loaded from data: URL.
+      invoker: invokeFromWorker.bind(undefined, "worker", true, {type: 'module'}),
+    },
+    "sharedworker-classic": {
+      // Classic shared worker loaded from same-origin.
+      invoker: invokeFromWorker.bind(undefined, "sharedworker", false, {}),
+    },
+    "sharedworker-classic-data": {
+      // Classic shared worker loaded from data: URL.
+      invoker: invokeFromWorker.bind(undefined, "sharedworker", true, {}),
+    },
+    "sharedworker-module": {
+      // Module shared worker loaded from same-origin.
+      invoker: invokeFromWorker.bind(undefined, "sharedworker", false, {type: 'module'}),
+    },
+    "sharedworker-module-data": {
+      // Module shared worker loaded from data: URL.
+      invoker: invokeFromWorker.bind(undefined, "sharedworker", true, {type: 'module'}),
+    },
+  };
+
+  return sourceContextMap[sourceContextList[0].sourceContextType].invoker(
+      subresource, sourceContextList);
+}
+
+// Quick hack to expose invokeRequest when common.sub.js is loaded either
+// as a classic or module script.
+self.invokeRequest = invokeRequest;
+
+/**
+  invokeFrom*() functions are helper functions with the same parameters
+  and return values as invokeRequest(), that are tied to specific types
+  of top-most environment settings objects.
+  For example, invokeFromIframe() is the helper function for the cases where
+  sourceContextList[0] is an iframe.
+*/
+
+/**
+  @param {string} workerType
+    "worker" (for dedicated worker) or "sharedworker".
+  @param {boolean} isDataUrl
+    true if the worker script is loaded from data: URL.
+    Otherwise, the script is loaded from same-origin.
+  @param {object} workerOptions
+    The `options` argument for Worker constructor.
+
+  Other parameters and return values are the same as those of invokeRequest().
+*/
+function invokeFromWorker(workerType, isDataUrl, workerOptions,
+                          subresource, sourceContextList) {
+  const currentSourceContext = sourceContextList[0];
+  let workerUrl =
+    "/common/security-features/scope/worker.py?policyDeliveries=" +
+    encodeURIComponent(JSON.stringify(
+        currentSourceContext.policyDeliveries || []));
+  if (workerOptions.type === 'module') {
+    workerUrl += "&type=module";
+  }
+
+  let promise;
+  if (isDataUrl) {
+    promise = fetch(workerUrl)
+      .then(r => r.text())
+      .then(source => {
+          return 'data:text/javascript;base64,' + btoa(source);
+        });
+  } else {
+    promise = Promise.resolve(workerUrl);
+  }
+
+  return promise
+    .then(url => {
+      if (workerType === "worker") {
+        const worker = new Worker(url, workerOptions);
+        worker.postMessage({subresource: subresource,
+                            sourceContextList: sourceContextList.slice(1)});
+        return bindEvents2(worker, "message", worker, "error", window, "error");
+      } else if (workerType === "sharedworker") {
+        const worker = new SharedWorker(url, workerOptions);
+        worker.port.start();
+        worker.port.postMessage({subresource: subresource,
+                                 sourceContextList: sourceContextList.slice(1)});
+        return bindEvents2(worker.port, "message", worker, "error", window, "error");
+      } else {
+        throw new Error('Invalid worker type: ' + workerType);
+      }
+    })
+    .then(event => {
+        if (event.data.error)
+          return Promise.reject(event.data.error);
+        return event.data;
+      });
+}
+
+function invokeFromIframe(subresource, sourceContextList) {
+  const currentSourceContext = sourceContextList[0];
+  const frameUrl =
+    "/common/security-features/scope/document.py?policyDeliveries=" +
+    encodeURIComponent(JSON.stringify(
+        currentSourceContext.policyDeliveries || []));
+
+  let iframe;
+  let promise;
+  if (currentSourceContext.sourceContextType === 'srcdoc') {
+    promise = fetch(frameUrl)
+      .then(r => r.text())
+      .then(srcdoc => {
+          iframe = createElement(
+              "iframe", {srcdoc: srcdoc}, document.body, true);
+          return iframe.eventPromise;
+        });
+  } else if (currentSourceContext.sourceContextType === 'iframe') {
+    iframe = createElement("iframe", {src: frameUrl}, document.body, true);
+    promise = iframe.eventPromise;
+  } else if (currentSourceContext.sourceContextType === 'iframe-blank') {
+    let frameContent;
+    promise = fetch(frameUrl)
+      .then(r => r.text())
+      .then(t => {
+          frameContent = t;
+          iframe = createElement("iframe", {}, document.body, true);
+          return iframe.eventPromise;
+        })
+      .then(() => {
+          // Reinitialize `iframe.eventPromise` with a new promise
+          // that catches the load event for the document.write() below.
+          bindEvents(iframe);
+
+          iframe.contentDocument.write(frameContent);
+          iframe.contentDocument.close();
+          return iframe.eventPromise;
+        });
+  }
+
+  return promise
+    .then(() => {
+        const promise = bindEvents2(
+            window, "message", iframe, "error", window, "error");
+        iframe.contentWindow.postMessage(
+            {subresource: subresource,
+             sourceContextList: sourceContextList.slice(1)},
+            "*");
+        return promise;
+      })
+    .then(event => {
+        if (event.data.error)
+          return Promise.reject(event.data.error);
+        return event.data;
+      });
+}
+
+// SanityChecker does nothing in release mode. See sanity-checker.js for debug
+// mode.
+function SanityChecker() {}
+SanityChecker.prototype.checkScenario = function() {};
+SanityChecker.prototype.setFailTimeout = function(test, timeout) {};
+SanityChecker.prototype.checkSubresourceResult = function() {};
diff --git a/test/wpt/tests/common/security-features/resources/common.sub.js.headers b/test/wpt/tests/common/security-features/resources/common.sub.js.headers
new file mode 100644
index 00000000000..cb762eff806
--- /dev/null
+++ b/test/wpt/tests/common/security-features/resources/common.sub.js.headers
@@ -0,0 +1 @@
+Access-Control-Allow-Origin: *
diff --git a/test/wpt/tests/common/security-features/scope/__init__.py b/test/wpt/tests/common/security-features/scope/__init__.py
new file mode 100644
index 00000000000..e69de29bb2d
diff --git a/test/wpt/tests/common/security-features/scope/document.py b/test/wpt/tests/common/security-features/scope/document.py
new file mode 100644
index 00000000000..9a9f045e640
--- /dev/null
+++ b/test/wpt/tests/common/security-features/scope/document.py
@@ -0,0 +1,36 @@
+import os, sys, json
+
+from wptserve.utils import isomorphic_decode, isomorphic_encode
+
+import importlib
+util = importlib.import_module("common.security-features.scope.util")
+
+def main(request, response):
+  policyDeliveries = json.loads(request.GET.first(b"policyDeliveries", b"[]"))
+  maybe_additional_headers = {}
+  meta = u''
+  error = u''
+  for delivery in policyDeliveries:
+    if delivery[u'deliveryType'] == u'meta':
+      if delivery[u'key'] == u'referrerPolicy':
+        meta += u'<meta name="referrer" content="%s">' % delivery[u'value']
+      else:
+        error = u'invalid delivery key'
+    elif delivery[u'deliveryType'] == u'http-rp':
+      if delivery[u'key'] == u'referrerPolicy':
+        maybe_additional_headers[b'Referrer-Policy'] = isomorphic_encode(delivery[u'value'])
+      else:
+        error = u'invalid delivery key'
+    else:
+      error = u'invalid deliveryType'
+
+  handler = lambda: util.get_template(u"document.html.template") % ({
+      u"meta": meta,
+      u"error": error
+  })
+  util.respond(
+      request,
+      response,
+      payload_generator=handler,
+      content_type=b"text/html",
+      maybe_additional_headers=maybe_additional_headers)
diff --git a/test/wpt/tests/common/security-features/scope/template/document.html.template b/test/wpt/tests/common/security-features/scope/template/document.html.template
new file mode 100644
index 00000000000..37e29f8e97f
--- /dev/null
+++ b/test/wpt/tests/common/security-features/scope/template/document.html.template
@@ -0,0 +1,30 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    %(meta)s
+    <script src="/common/security-features/resources/common.sub.js"></script>
+    <script>
+    // Receive a message from the parent and start the test.
+    function onMessageFromParent(event) {
+      // Because this window might receive messages from child iframe during
+      // tests, we first remove the listener here before staring the test.
+      window.removeEventListener('message', onMessageFromParent);
+
+      const configurationError = "%(error)s";
+      if (configurationError.length > 0) {
+        parent.postMessage({error: configurationError}, "*");
+        return;
+      }
+
+      invokeRequest(event.data.subresource,
+                    event.data.sourceContextList)
+        .then(result => parent.postMessage(result, "*"))
+        .catch(e => {
+            const message = (e.error && e.error.stack) || e.message || "Error";
+            parent.postMessage({error: message}, "*");
+          });
+    }
+    window.addEventListener('message', onMessageFromParent);
+    </script>
+  </head>
+</html>
diff --git a/test/wpt/tests/common/security-features/scope/template/worker.js.template b/test/wpt/tests/common/security-features/scope/template/worker.js.template
new file mode 100644
index 00000000000..7a2a6e05c44
--- /dev/null
+++ b/test/wpt/tests/common/security-features/scope/template/worker.js.template
@@ -0,0 +1,29 @@
+%(import)s
+
+if ('DedicatedWorkerGlobalScope' in self &&
+    self instanceof DedicatedWorkerGlobalScope) {
+  self.onmessage = event => onMessageFromParent(event, self);
+} else if ('SharedWorkerGlobalScope' in self &&
+    self instanceof SharedWorkerGlobalScope) {
+  onconnect = event => {
+    const port = event.ports[0];
+    port.onmessage = event => onMessageFromParent(event, port);
+  };
+}
+
+// Receive a message from the parent and start the test.
+function onMessageFromParent(event, port) {
+  const configurationError = "%(error)s";
+  if (configurationError.length > 0) {
+    port.postMessage({error: configurationError});
+    return;
+  }
+
+  invokeRequest(event.data.subresource,
+                event.data.sourceContextList)
+    .then(result => port.postMessage(result))
+    .catch(e => {
+        const message = (e.error && e.error.stack) || e.message || "Error";
+        port.postMessage({error: message});
+      });
+}
diff --git a/test/wpt/tests/common/security-features/scope/util.py b/test/wpt/tests/common/security-features/scope/util.py
new file mode 100644
index 00000000000..da5aacf35e9
--- /dev/null
+++ b/test/wpt/tests/common/security-features/scope/util.py
@@ -0,0 +1,43 @@
+import os
+
+from wptserve.utils import isomorphic_decode
+
+def get_template(template_basename):
+  script_directory = os.path.dirname(os.path.abspath(isomorphic_decode(__file__)))
+  template_directory = os.path.abspath(
+      os.path.join(script_directory, u"template"))
+  template_filename = os.path.join(template_directory, template_basename)
+
+  with open(template_filename, "r") as f:
+    return f.read()
+
+
+def __noop(request, response):
+  return u""
+
+
+def respond(request,
+            response,
+            status_code=200,
+            content_type=b"text/html",
+            payload_generator=__noop,
+            cache_control=b"no-cache; must-revalidate",
+            access_control_allow_origin=b"*",
+            maybe_additional_headers=None):
+  response.add_required_headers = False
+  response.writer.write_status(status_code)
+
+  if access_control_allow_origin != None:
+    response.writer.write_header(b"access-control-allow-origin",
+                                 access_control_allow_origin)
+  response.writer.write_header(b"content-type", content_type)
+  response.writer.write_header(b"cache-control", cache_control)
+
+  additional_headers = maybe_additional_headers or {}
+  for header, value in additional_headers.items():
+    response.writer.write_header(header, value)
+
+  response.writer.end_headers()
+
+  payload = payload_generator()
+  response.writer.write(payload)
diff --git a/test/wpt/tests/common/security-features/scope/worker.py b/test/wpt/tests/common/security-features/scope/worker.py
new file mode 100644
index 00000000000..6b321e7de17
--- /dev/null
+++ b/test/wpt/tests/common/security-features/scope/worker.py
@@ -0,0 +1,44 @@
+import os, sys, json
+
+from wptserve.utils import isomorphic_decode, isomorphic_encode
+import importlib
+util = importlib.import_module("common.security-features.scope.util")
+
+def main(request, response):
+  policyDeliveries = json.loads(request.GET.first(b'policyDeliveries', b'[]'))
+  worker_type = request.GET.first(b'type', b'classic')
+  commonjs_url = u'%s://%s:%s/common/security-features/resources/common.sub.js' % (
+      request.url_parts.scheme, request.url_parts.hostname,
+      request.url_parts.port)
+  if worker_type == b'classic':
+    import_line = u'importScripts("%s");' % commonjs_url
+  else:
+    import_line = u'import "%s";' % commonjs_url
+
+  maybe_additional_headers = {}
+  error = u''
+  for delivery in policyDeliveries:
+    if delivery[u'deliveryType'] == u'meta':
+      error = u'<meta> cannot be used in WorkerGlobalScope'
+    elif delivery[u'deliveryType'] == u'http-rp':
+      if delivery[u'key'] == u'referrerPolicy':
+        maybe_additional_headers[b'Referrer-Policy'] = isomorphic_encode(delivery[u'value'])
+      elif delivery[u'key'] == u'mixedContent' and delivery[u'value'] == u'opt-in':
+        maybe_additional_headers[b'Content-Security-Policy'] = b'block-all-mixed-content'
+      elif delivery[u'key'] == u'upgradeInsecureRequests' and delivery[u'value'] == u'upgrade':
+        maybe_additional_headers[b'Content-Security-Policy'] = b'upgrade-insecure-requests'
+      else:
+        error = u'invalid delivery key for http-rp: %s' % delivery[u'key']
+    else:
+      error = u'invalid deliveryType: %s' % delivery[u'deliveryType']
+
+  handler = lambda: util.get_template(u'worker.js.template') % ({
+      u'import': import_line,
+      u'error': error
+  })
+  util.respond(
+      request,
+      response,
+      payload_generator=handler,
+      content_type=b'text/javascript',
+      maybe_additional_headers=maybe_additional_headers)
diff --git a/test/wpt/tests/common/security-features/subresource/__init__.py b/test/wpt/tests/common/security-features/subresource/__init__.py
new file mode 100644
index 00000000000..e69de29bb2d
diff --git a/test/wpt/tests/common/security-features/subresource/audio.py b/test/wpt/tests/common/security-features/subresource/audio.py
new file mode 100644
index 00000000000..f16a0f7fbbe
--- /dev/null
+++ b/test/wpt/tests/common/security-features/subresource/audio.py
@@ -0,0 +1,18 @@
+import os, sys
+from wptserve.utils import isomorphic_decode
+import importlib
+subresource = importlib.import_module("common.security-features.subresource.subresource")
+
+def generate_payload(request, server_data):
+    file = os.path.join(request.doc_root, u"webaudio", u"resources",
+                        u"sin_440Hz_-6dBFS_1s.wav")
+    return open(file, "rb").read()
+
+
+def main(request, response):
+    handler = lambda data: generate_payload(request, data)
+    subresource.respond(request,
+                        response,
+                        payload_generator = handler,
+                        access_control_allow_origin = b"*",
+                        content_type = b"audio/wav")
diff --git a/test/wpt/tests/common/security-features/subresource/document.py b/test/wpt/tests/common/security-features/subresource/document.py
new file mode 100644
index 00000000000..52b684a4d9f
--- /dev/null
+++ b/test/wpt/tests/common/security-features/subresource/document.py
@@ -0,0 +1,12 @@
+import os, sys
+from wptserve.utils import isomorphic_decode
+import importlib
+subresource = importlib.import_module("common.security-features.subresource.subresource")
+
+def generate_payload(server_data):
+    return subresource.get_template(u"document.html.template") % server_data
+
+def main(request, response):
+    subresource.respond(request,
+                        response,
+                        payload_generator = generate_payload)
diff --git a/test/wpt/tests/common/security-features/subresource/empty.py b/test/wpt/tests/common/security-features/subresource/empty.py
new file mode 100644
index 00000000000..312e12cbed9
--- /dev/null
+++ b/test/wpt/tests/common/security-features/subresource/empty.py
@@ -0,0 +1,14 @@
+import os, sys
+from wptserve.utils import isomorphic_decode
+import importlib
+subresource = importlib.import_module("common.security-features.subresource.subresource")
+
+def generate_payload(server_data):
+    return u''
+
+def main(request, response):
+    subresource.respond(request,
+                        response,
+                        payload_generator = generate_payload,
+                        access_control_allow_origin = b"*",
+                        content_type = b"text/plain")
diff --git a/test/wpt/tests/common/security-features/subresource/font.py b/test/wpt/tests/common/security-features/subresource/font.py
new file mode 100644
index 00000000000..7900079cdf3
--- /dev/null
+++ b/test/wpt/tests/common/security-features/subresource/font.py
@@ -0,0 +1,76 @@
+import os, sys
+from base64 import decodebytes
+
+from wptserve.utils import isomorphic_decode
+import importlib
+subresource = importlib.import_module("common.security-features.subresource.subresource")
+
+
+def generate_payload(request, server_data):
+    data = (u'{"headers": %(headers)s}') % server_data
+    if b"id" in request.GET:
+        request.server.stash.put(request.GET[b"id"], data)
+    # Simple base64 encoded .tff font
+    return decodebytes(b"AAEAAAANAIAAAwBQRkZUTU6u6MkAAAXcAAAAHE9TLzJWYW"
+                       b"QKAAABWAAAAFZjbWFwAA8D7wAAAcAAAAFCY3Z0IAAhAnkA"
+                       b"AAMEAAAABGdhc3D//wADAAAF1AAAAAhnbHlmCC6aTwAAAx"
+                       b"QAAACMaGVhZO8ooBcAAADcAAAANmhoZWEIkAV9AAABFAAA"
+                       b"ACRobXR4EZQAhQAAAbAAAAAQbG9jYQBwAFQAAAMIAAAACm"
+                       b"1heHAASQA9AAABOAAAACBuYW1lehAVOgAAA6AAAAIHcG9z"
+                       b"dP+uADUAAAWoAAAAKgABAAAAAQAAMhPyuV8PPPUACwPoAA"
+                       b"AAAMU4Lm0AAAAAxTgubQAh/5wFeAK8AAAACAACAAAAAAAA"
+                       b"AAEAAAK8/5wAWgXcAAAAAAV4AAEAAAAAAAAAAAAAAAAAAA"
+                       b"AEAAEAAAAEAAwAAwAAAAAAAgAAAAEAAQAAAEAALgAAAAAA"
+                       b"AQXcAfQABQAAAooCvAAAAIwCigK8AAAB4AAxAQIAAAIABg"
+                       b"kAAAAAAAAAAAABAAAAAAAAAAAAAAAAUGZFZABAAEEAQQMg"
+                       b"/zgAWgK8AGQAAAABAAAAAAAABdwAIQAAAAAF3AAABdwAZA"
+                       b"AAAAMAAAADAAAAHAABAAAAAAA8AAMAAQAAABwABAAgAAAA"
+                       b"BAAEAAEAAABB//8AAABB////wgABAAAAAAAAAQYAAAEAAA"
+                       b"AAAAAAAQIAAAACAAAAAAAAAAAAAAAAAAAAAQAAAAAAAAAA"
+                       b"AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAwAAAAAAAA"
+                       b"AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA"
+                       b"AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA"
+                       b"AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA"
+                       b"AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA"
+                       b"AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA"
+                       b"AAAAAAAAAAAAAAAAAAAhAnkAAAAqACoAKgBGAAAAAgAhAA"
+                       b"ABKgKaAAMABwAusQEALzyyBwQA7TKxBgXcPLIDAgDtMgCx"
+                       b"AwAvPLIFBADtMrIHBgH8PLIBAgDtMjMRIREnMxEjIQEJ6M"
+                       b"fHApr9ZiECWAAAAwBk/5wFeAK8AAMABwALAAABNSEVATUh"
+                       b"FQE1IRUB9AH0/UQDhPu0BRQB9MjI/tTIyP7UyMgAAAAAAA"
+                       b"4ArgABAAAAAAAAACYATgABAAAAAAABAAUAgQABAAAAAAAC"
+                       b"AAYAlQABAAAAAAADACEA4AABAAAAAAAEAAUBDgABAAAAAA"
+                       b"AFABABNgABAAAAAAAGAAUBUwADAAEECQAAAEwAAAADAAEE"
+                       b"CQABAAoAdQADAAEECQACAAwAhwADAAEECQADAEIAnAADAA"
+                       b"EECQAEAAoBAgADAAEECQAFACABFAADAAEECQAGAAoBRwBD"
+                       b"AG8AcAB5AHIAaQBnAGgAdAAgACgAYwApACAAMgAwADAAOA"
+                       b"AgAE0AbwB6AGkAbABsAGEAIABDAG8AcgBwAG8AcgBhAHQA"
+                       b"aQBvAG4AAENvcHlyaWdodCAoYykgMjAwOCBNb3ppbGxhIE"
+                       b"NvcnBvcmF0aW9uAABNAGEAcgBrAEEAAE1hcmtBAABNAGUA"
+                       b"ZABpAHUAbQAATWVkaXVtAABGAG8AbgB0AEYAbwByAGcAZQ"
+                       b"AgADIALgAwACAAOgAgAE0AYQByAGsAQQAgADoAIAA1AC0A"
+                       b"MQAxAC0AMgAwADAAOAAARm9udEZvcmdlIDIuMCA6IE1hcm"
+                       b"tBIDogNS0xMS0yMDA4AABNAGEAcgBrAEEAAE1hcmtBAABW"
+                       b"AGUAcgBzAGkAbwBuACAAMAAwADEALgAwADAAMAAgAABWZX"
+                       b"JzaW9uIDAwMS4wMDAgAABNAGEAcgBrAEEAAE1hcmtBAAAA"
+                       b"AgAAAAAAAP+DADIAAAABAAAAAAAAAAAAAAAAAAAAAAAEAA"
+                       b"AAAQACACQAAAAAAAH//wACAAAAAQAAAADEPovuAAAAAMU4"
+                       b"Lm0AAAAAxTgubQ==")
+
+def generate_report_headers_payload(request, server_data):
+    stashed_data = request.server.stash.take(request.GET[b"id"])
+    return stashed_data
+
+def main(request, response):
+    handler = lambda data: generate_payload(request, data)
+    content_type = b'application/x-font-truetype'
+
+    if b"report-headers" in request.GET:
+        handler = lambda data: generate_report_headers_payload(request, data)
+        content_type = b'application/json'
+
+    subresource.respond(request,
+                        response,
+                        payload_generator = handler,
+                        content_type = content_type,
+                        access_control_allow_origin = b"*")
diff --git a/test/wpt/tests/common/security-features/subresource/image.py b/test/wpt/tests/common/security-features/subresource/image.py
new file mode 100644
index 00000000000..5c9a0c063c3
--- /dev/null
+++ b/test/wpt/tests/common/security-features/subresource/image.py
@@ -0,0 +1,116 @@
+import os, sys, array, math
+
+from io import BytesIO
+
+from wptserve.utils import isomorphic_decode
+
+import importlib
+subresource = importlib.import_module("common.security-features.subresource.subresource")
+
+class Image:
+    """This class partially implements the interface of the PIL.Image.Image.
+       One day in the future WPT might support the PIL module or another imaging
+       library, so this hacky BMP implementation will no longer be required.
+    """
+    def __init__(self, width, height):
+        self.width = width
+        self.height = height
+        self.img = bytearray([0 for i in range(3 * width * height)])
+
+    @staticmethod
+    def new(mode, size, color=0):
+        return Image(size[0], size[1])
+
+    def _int_to_bytes(self, number):
+        packed_bytes = [0, 0, 0, 0]
+        for i in range(4):
+            packed_bytes[i] = number & 0xFF
+            number >>= 8
+
+        return packed_bytes
+
+    def putdata(self, color_data):
+        for y in range(self.height):
+            for x in range(self.width):
+                i = x + y * self.width
+                if i > len(color_data) - 1:
+                    return
+
+                self.img[i * 3: i * 3 + 3] = color_data[i][::-1]
+
+    def save(self, f, type):
+        assert type == "BMP"
+        # 54 bytes of preambule + image color data.
+        filesize = 54 + 3 * self.width * self.height
+        # 14 bytes of header.
+        bmpfileheader = bytearray([ord('B'), ord('M')] + self._int_to_bytes(filesize) +
+                                  [0, 0, 0, 0, 54, 0, 0, 0])
+        # 40 bytes of info.
+        bmpinfoheader = bytearray([40, 0, 0, 0] +
+                                  self._int_to_bytes(self.width) +
+                                  self._int_to_bytes(self.height) +
+                                  [1, 0, 24] + (25 * [0]))
+
+        padlength = (4 - (self.width * 3) % 4) % 4
+        bmppad = bytearray([0, 0, 0])
+        padding = bmppad[0 : padlength]
+
+        f.write(bmpfileheader)
+        f.write(bmpinfoheader)
+
+        for i in range(self.height):
+            offset = self.width * (self.height - i - 1) * 3
+            f.write(self.img[offset : offset + 3 * self.width])
+            f.write(padding)
+
+def encode_string_as_bmp_image(string_data):
+    data_bytes = array.array("B", string_data.encode("utf-8"))
+
+    num_bytes = len(data_bytes)
+
+    # Encode data bytes to color data (RGB), one bit per channel.
+    # This is to avoid errors due to different color spaces used in decoding.
+    color_data = []
+    for byte in data_bytes:
+        p = [int(x) * 255 for x in '{0:08b}'.format(byte)]
+        color_data.append((p[0], p[1], p[2]))
+        color_data.append((p[3], p[4], p[5]))
+        color_data.append((p[6], p[7], 0))
+
+    # Render image.
+    num_pixels = len(color_data)
+    sqrt = int(math.ceil(math.sqrt(num_pixels)))
+    img = Image.new("RGB", (sqrt, sqrt), "black")
+    img.putdata(color_data)
+
+    # Flush image to string.
+    f = BytesIO()
+    img.save(f, "BMP")
+    f.seek(0)
+
+    return f.read()
+
+def generate_payload(request, server_data):
+    data = (u'{"headers": %(headers)s}') % server_data
+    if b"id" in request.GET:
+        request.server.stash.put(request.GET[b"id"], data)
+    data = encode_string_as_bmp_image(data)
+    return data
+
+def generate_report_headers_payload(request, server_data):
+    stashed_data = request.server.stash.take(request.GET[b"id"])
+    return stashed_data
+
+def main(request, response):
+    handler = lambda data: generate_payload(request, data)
+    content_type = b'image/bmp'
+
+    if b"report-headers" in request.GET:
+        handler = lambda data: generate_report_headers_payload(request, data)
+        content_type = b'application/json'
+
+    subresource.respond(request,
+                        response,
+                        payload_generator = handler,
+                        content_type = content_type,
+                        access_control_allow_origin = b"*")
diff --git a/test/wpt/tests/common/security-features/subresource/referrer.py b/test/wpt/tests/common/security-features/subresource/referrer.py
new file mode 100644
index 00000000000..e36631479e6
--- /dev/null
+++ b/test/wpt/tests/common/security-features/subresource/referrer.py
@@ -0,0 +1,4 @@
+def main(request, response):
+    referrer = request.headers.get(b"referer", b"")
+    response_headers = [(b"Content-Type", b"text/javascript")]
+    return (200, response_headers, b"window.referrer = '" + referrer + b"'")
diff --git a/test/wpt/tests/common/security-features/subresource/script.py b/test/wpt/tests/common/security-features/subresource/script.py
new file mode 100644
index 00000000000..9701816b9fa
--- /dev/null
+++ b/test/wpt/tests/common/security-features/subresource/script.py
@@ -0,0 +1,14 @@
+import os, sys
+from wptserve.utils import isomorphic_decode
+
+import importlib
+subresource = importlib.import_module("common.security-features.subresource.subresource")
+
+def generate_payload(server_data):
+    return subresource.get_template(u"script.js.template") % server_data
+
+def main(request, response):
+    subresource.respond(request,
+                        response,
+                        payload_generator = generate_payload,
+                        content_type = b"application/javascript")
diff --git a/test/wpt/tests/common/security-features/subresource/shared-worker.py b/test/wpt/tests/common/security-features/subresource/shared-worker.py
new file mode 100644
index 00000000000..bdfb61bbb3f
--- /dev/null
+++ b/test/wpt/tests/common/security-features/subresource/shared-worker.py
@@ -0,0 +1,13 @@
+import os, sys
+from wptserve.utils import isomorphic_decode
+import importlib
+subresource = importlib.import_module("common.security-features.subresource.subresource")
+
+def generate_payload(server_data):
+    return subresource.get_template(u"shared-worker.js.template") % server_data
+
+def main(request, response):
+    subresource.respond(request,
+                        response,
+                        payload_generator = generate_payload,
+                        content_type = b"application/javascript")
diff --git a/test/wpt/tests/common/security-features/subresource/static-import.py b/test/wpt/tests/common/security-features/subresource/static-import.py
new file mode 100644
index 00000000000..3c3a6f6871d
--- /dev/null
+++ b/test/wpt/tests/common/security-features/subresource/static-import.py
@@ -0,0 +1,61 @@
+import os, sys, json
+from urllib.parse import unquote
+
+from wptserve.utils import isomorphic_decode
+import importlib
+subresource = importlib.import_module("common.security-features.subresource.subresource")
+
+def get_csp_value(value):
+    '''
+    Returns actual CSP header values (e.g. "worker-src 'self'") for the
+    given string used in PolicyDelivery's value (e.g. "worker-src-self").
+    '''
+
+    # script-src
+    # Test-related scripts like testharness.js and inline scripts containing
+    # test bodies.
+    # 'unsafe-inline' is added as a workaround here. This is probably not so
+    # bad, as it shouldn't intefere non-inline-script requests that we want to
+    # test.
+    if value == 'script-src-wildcard':
+        return "script-src * 'unsafe-inline'"
+    if value == 'script-src-self':
+        return "script-src 'self' 'unsafe-inline'"
+    # Workaround for "script-src 'none'" would be more complicated, because
+    # - "script-src 'none' 'unsafe-inline'" is handled somehow differently from
+    #   "script-src 'none'", i.e.
+    #   https://w3c.github.io/webappsec-csp/#match-url-to-source-list Step 3
+    #   handles the latter but not the former.
+    # - We need nonce- or path-based additional values to allow same-origin
+    #   test scripts like testharness.js.
+    # Therefore, we disable 'script-src-none' tests for now in
+    # `/content-security-policy/spec.src.json`.
+    if value == 'script-src-none':
+        return "script-src 'none'"
+
+    # worker-src
+    if value == 'worker-src-wildcard':
+        return 'worker-src *'
+    if value == 'worker-src-self':
+        return "worker-src 'self'"
+    if value == 'worker-src-none':
+        return "worker-src 'none'"
+    raise Exception('Invalid delivery_value: %s' % value)
+
+def generate_payload(request):
+    import_url = unquote(isomorphic_decode(request.GET[b'import_url']))
+    return subresource.get_template(u"static-import.js.template") % {
+        u"import_url": import_url
+    }
+
+def main(request, response):
+    def payload_generator(_): return generate_payload(request)
+    maybe_additional_headers = {}
+    if b'contentSecurityPolicy' in request.GET:
+        csp = unquote(isomorphic_decode(request.GET[b'contentSecurityPolicy']))
+        maybe_additional_headers[b'Content-Security-Policy'] = get_csp_value(csp)
+    subresource.respond(request,
+                        response,
+                        payload_generator = payload_generator,
+                        content_type = b"application/javascript",
+                        maybe_additional_headers = maybe_additional_headers)
diff --git a/test/wpt/tests/common/security-features/subresource/stylesheet.py b/test/wpt/tests/common/security-features/subresource/stylesheet.py
new file mode 100644
index 00000000000..05db249250d
--- /dev/null
+++ b/test/wpt/tests/common/security-features/subresource/stylesheet.py
@@ -0,0 +1,61 @@
+import os, sys
+from wptserve.utils import isomorphic_decode
+import importlib
+subresource = importlib.import_module("common.security-features.subresource.subresource")
+
+def generate_payload(request, server_data):
+    data = (u'{"headers": %(headers)s}') % server_data
+    type = b'image'
+    if b"type" in request.GET:
+        type = request.GET[b"type"]
+
+    if b"id" in request.GET:
+        request.server.stash.put(request.GET[b"id"], data)
+
+    if type == b'image':
+        return subresource.get_template(u"image.css.template") % {u"id": isomorphic_decode(request.GET[b"id"])}
+
+    elif type == b'font':
+        return subresource.get_template(u"font.css.template") % {u"id": isomorphic_decode(request.GET[b"id"])}
+
+    elif type == b'svg':
+        return subresource.get_template(u"svg.css.template") % {
+            u"id": isomorphic_decode(request.GET[b"id"]),
+            u"property": isomorphic_decode(request.GET[b"property"])}
+
+    # A `'stylesheet-only'`-type stylesheet has no nested resources; this is
+    # useful in tests that cover referrers for stylesheet fetches (e.g. fetches
+    # triggered by `@import` statements).
+    elif type == b'stylesheet-only':
+        return u''
+
+def generate_import_rule(request, server_data):
+    return u"@import url('%(url)s');" % {
+        u"url": subresource.create_url(request, swap_origin=True,
+                                       query_parameter_to_remove=u"import-rule")
+    }
+
+def generate_report_headers_payload(request, server_data):
+    stashed_data = request.server.stash.take(request.GET[b"id"])
+    return stashed_data
+
+def main(request, response):
+    payload_generator = lambda data: generate_payload(request, data)
+    content_type = b"text/css"
+    referrer_policy = b"unsafe-url"
+    if b"import-rule" in request.GET:
+        payload_generator = lambda data: generate_import_rule(request, data)
+
+    if b"report-headers" in request.GET:
+        payload_generator = lambda data: generate_report_headers_payload(request, data)
+        content_type = b'application/json'
+
+    if b"referrer-policy" in request.GET:
+        referrer_policy = request.GET[b"referrer-policy"]
+
+    subresource.respond(
+        request,
+        response,
+        payload_generator = payload_generator,
+        content_type = content_type,
+        maybe_additional_headers = { b"Referrer-Policy": referrer_policy })
diff --git a/test/wpt/tests/common/security-features/subresource/subresource.py b/test/wpt/tests/common/security-features/subresource/subresource.py
new file mode 100644
index 00000000000..b3c055a93a5
--- /dev/null
+++ b/test/wpt/tests/common/security-features/subresource/subresource.py
@@ -0,0 +1,199 @@
+import os, json
+from urllib.parse import parse_qsl, SplitResult, urlencode, urlsplit, urlunsplit
+
+from wptserve.utils import isomorphic_decode, isomorphic_encode
+
+def get_template(template_basename):
+    script_directory = os.path.dirname(os.path.abspath(isomorphic_decode(__file__)))
+    template_directory = os.path.abspath(os.path.join(script_directory,
+                                                      u"template"))
+    template_filename = os.path.join(template_directory, template_basename)
+
+    with open(template_filename, "r") as f:
+        return f.read()
+
+
+def redirect(url, response):
+    response.add_required_headers = False
+    response.writer.write_status(301)
+    response.writer.write_header(b"access-control-allow-origin", b"*")
+    response.writer.write_header(b"location", isomorphic_encode(url))
+    response.writer.end_headers()
+    response.writer.write(u"")
+
+
+# TODO(kristijanburnik): subdomain_prefix is a hardcoded value aligned with
+# referrer-policy-test-case.js. The prefix should be configured in one place.
+def __get_swapped_origin_netloc(netloc, subdomain_prefix = u"www1."):
+    if netloc.startswith(subdomain_prefix):
+        return netloc[len(subdomain_prefix):]
+    else:
+        return subdomain_prefix + netloc
+
+
+# Creates a URL (typically a redirect target URL) that is the same as the
+# current request URL `request.url`, except for:
+# - When `swap_scheme` or `swap_origin` is True, its scheme/origin is changed
+#   to the other one. (http <-> https, ws <-> wss, etc.)
+# - For `downgrade`, we redirect to a URL that would be successfully loaded
+#   if and only if upgrade-insecure-request is applied.
+# - `query_parameter_to_remove` parameter is removed from query part.
+#   Its default is "redirection" to avoid redirect loops.
+def create_url(request,
+               swap_scheme=False,
+               swap_origin=False,
+               downgrade=False,
+               query_parameter_to_remove=u"redirection"):
+    parsed = urlsplit(request.url)
+    destination_netloc = parsed.netloc
+
+    scheme = parsed.scheme
+    if swap_scheme:
+        scheme = u"http" if parsed.scheme == u"https" else u"https"
+        hostname = parsed.netloc.split(u':')[0]
+        port = request.server.config[u"ports"][scheme][0]
+        destination_netloc = u":".join([hostname, str(port)])
+
+    if downgrade:
+        # These rely on some unintuitive cleverness due to WPT's test setup:
+        # 'Upgrade-Insecure-Requests' does not upgrade the port number,
+        # so we use URLs in the form `http://[domain]:[https-port]`,
+        # which will be upgraded to `https://[domain]:[https-port]`.
+        # If the upgrade fails, the load will fail, as we don't serve HTTP over
+        # the secure port.
+        if parsed.scheme == u"https":
+            scheme = u"http"
+        elif parsed.scheme == u"wss":
+            scheme = u"ws"
+        else:
+            raise ValueError(u"Downgrade redirection: Invalid scheme '%s'" %
+                             parsed.scheme)
+        hostname = parsed.netloc.split(u':')[0]
+        port = request.server.config[u"ports"][parsed.scheme][0]
+        destination_netloc = u":".join([hostname, str(port)])
+
+    if swap_origin:
+        destination_netloc = __get_swapped_origin_netloc(destination_netloc)
+
+    parsed_query = parse_qsl(parsed.query, keep_blank_values=True)
+    parsed_query = [x for x in parsed_query if x[0] != query_parameter_to_remove]
+
+    destination_url = urlunsplit(SplitResult(
+        scheme = scheme,
+        netloc = destination_netloc,
+        path = parsed.path,
+        query = urlencode(parsed_query),
+        fragment = None))
+
+    return destination_url
+
+
+def preprocess_redirection(request, response):
+    if b"redirection" not in request.GET:
+        return False
+
+    redirection = request.GET[b"redirection"]
+
+    if redirection == b"no-redirect":
+        return False
+    elif redirection == b"keep-scheme":
+        redirect_url = create_url(request, swap_scheme=False)
+    elif redirection == b"swap-scheme":
+        redirect_url = create_url(request, swap_scheme=True)
+    elif redirection == b"downgrade":
+        redirect_url = create_url(request, downgrade=True)
+    elif redirection == b"keep-origin":
+        redirect_url = create_url(request, swap_origin=False)
+    elif redirection == b"swap-origin":
+        redirect_url = create_url(request, swap_origin=True)
+    else:
+        raise ValueError(u"Invalid redirection type '%s'" % isomorphic_decode(redirection))
+
+    redirect(redirect_url, response)
+    return True
+
+
+def preprocess_stash_action(request, response):
+    if b"action" not in request.GET:
+        return False
+
+    action = request.GET[b"action"]
+
+    key = request.GET[b"key"]
+    stash = request.server.stash
+    path = request.GET[b"path"] if b"path" in request.GET \
+           else isomorphic_encode(request.url.split(u'?')[0])
+
+    if action == b"put":
+        value = isomorphic_decode(request.GET[b"value"])
+        stash.take(key=key, path=path)
+        stash.put(key=key, value=value, path=path)
+        response_data = json.dumps({u"status": u"success", u"result": isomorphic_decode(key)})
+    elif action == b"purge":
+        value = stash.take(key=key, path=path)
+        return False
+    elif action == b"take":
+        value = stash.take(key=key, path=path)
+        if value is None:
+            status = u"allowed"
+        else:
+            status = u"blocked"
+        response_data = json.dumps({u"status": status, u"result": value})
+    else:
+        return False
+
+    response.add_required_headers = False
+    response.writer.write_status(200)
+    response.writer.write_header(b"content-type", b"text/javascript")
+    response.writer.write_header(b"cache-control", b"no-cache; must-revalidate")
+    response.writer.end_headers()
+    response.writer.write(response_data)
+    return True
+
+
+def __noop(request, response):
+    return u""
+
+
+def respond(request,
+            response,
+            status_code = 200,
+            content_type = b"text/html",
+            payload_generator = __noop,
+            cache_control = b"no-cache; must-revalidate",
+            access_control_allow_origin = b"*",
+            maybe_additional_headers = None):
+    if preprocess_redirection(request, response):
+        return
+
+    if preprocess_stash_action(request, response):
+        return
+
+    response.add_required_headers = False
+    response.writer.write_status(status_code)
+
+    if access_control_allow_origin != None:
+        response.writer.write_header(b"access-control-allow-origin",
+                                     access_control_allow_origin)
+    response.writer.write_header(b"content-type", content_type)
+    response.writer.write_header(b"cache-control", cache_control)
+
+    additional_headers = maybe_additional_headers or {}
+    for header, value in additional_headers.items():
+        response.writer.write_header(header, value)
+
+    response.writer.end_headers()
+
+    new_headers = {}
+    new_val = []
+    for key, val in request.headers.items():
+        if len(val) == 1:
+            new_val = isomorphic_decode(val[0])
+        else:
+            new_val = [isomorphic_decode(x) for x in val]
+        new_headers[isomorphic_decode(key)] = new_val
+
+    server_data = {u"headers": json.dumps(new_headers, indent = 4)}
+
+    payload = payload_generator(server_data)
+    response.writer.write(payload)
diff --git a/test/wpt/tests/common/security-features/subresource/svg.py b/test/wpt/tests/common/security-features/subresource/svg.py
new file mode 100644
index 00000000000..9c569e3bf52
--- /dev/null
+++ b/test/wpt/tests/common/security-features/subresource/svg.py
@@ -0,0 +1,37 @@
+import os, sys
+from wptserve.utils import isomorphic_decode
+import importlib
+subresource = importlib.import_module("common.security-features.subresource.subresource")
+
+def generate_payload(request, server_data):
+    data = (u'{"headers": %(headers)s}') % server_data
+    if b"id" in request.GET:
+        with request.server.stash.lock:
+            request.server.stash.take(request.GET[b"id"])
+            request.server.stash.put(request.GET[b"id"], data)
+    return u"<svg xmlns='http://www.w3.org/2000/svg'></svg>"
+
+def generate_payload_embedded(request, server_data):
+    return subresource.get_template(u"svg.embedded.template") % {
+        u"id": isomorphic_decode(request.GET[b"id"]),
+        u"property": isomorphic_decode(request.GET[b"property"])}
+
+def generate_report_headers_payload(request, server_data):
+    stashed_data = request.server.stash.take(request.GET[b"id"])
+    return stashed_data
+
+def main(request, response):
+    handler = lambda data: generate_payload(request, data)
+    content_type = b'image/svg+xml'
+
+    if b"embedded-svg" in request.GET:
+        handler = lambda data: generate_payload_embedded(request, data)
+
+    if b"report-headers" in request.GET:
+        handler = lambda data: generate_report_headers_payload(request, data)
+        content_type = b'application/json'
+
+    subresource.respond(request,
+                        response,
+                        payload_generator = handler,
+                        content_type = content_type)
diff --git a/test/wpt/tests/common/security-features/subresource/template/document.html.template b/test/wpt/tests/common/security-features/subresource/template/document.html.template
new file mode 100644
index 00000000000..141711c1483
--- /dev/null
+++ b/test/wpt/tests/common/security-features/subresource/template/document.html.template
@@ -0,0 +1,16 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>This page reports back it's request details to the parent frame</title>
+  </head>
+  <body>
+    <script>
+      var result = {
+        location: document.location.toString(),
+        referrer: document.referrer.length > 0 ? document.referrer : undefined,
+        headers: %(headers)s
+      };
+      parent.postMessage(result, "*");
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/common/security-features/subresource/template/font.css.template b/test/wpt/tests/common/security-features/subresource/template/font.css.template
new file mode 100644
index 00000000000..9d1e9c421cc
--- /dev/null
+++ b/test/wpt/tests/common/security-features/subresource/template/font.css.template
@@ -0,0 +1,9 @@
+@font-face {
+  font-family: 'wpt';
+  font-style: normal;
+  font-weight: normal;
+  src: url(/common/security-features/subresource/font.py?id=%(id)s) format('truetype');
+}
+body {
+  font-family: 'wpt';
+}
diff --git a/test/wpt/tests/common/security-features/subresource/template/image.css.template b/test/wpt/tests/common/security-features/subresource/template/image.css.template
new file mode 100644
index 00000000000..dfe41f1bf16
--- /dev/null
+++ b/test/wpt/tests/common/security-features/subresource/template/image.css.template
@@ -0,0 +1,3 @@
+div.styled::before {
+  content:url(/common/security-features/subresource/image.py?id=%(id)s)
+}
diff --git a/test/wpt/tests/common/security-features/subresource/template/script.js.template b/test/wpt/tests/common/security-features/subresource/template/script.js.template
new file mode 100644
index 00000000000..e2edf21819d
--- /dev/null
+++ b/test/wpt/tests/common/security-features/subresource/template/script.js.template
@@ -0,0 +1,3 @@
+postMessage({
+  "headers": %(headers)s
+}, "*");
diff --git a/test/wpt/tests/common/security-features/subresource/template/shared-worker.js.template b/test/wpt/tests/common/security-features/subresource/template/shared-worker.js.template
new file mode 100644
index 00000000000..c3f109e4a90
--- /dev/null
+++ b/test/wpt/tests/common/security-features/subresource/template/shared-worker.js.template
@@ -0,0 +1,5 @@
+onconnect = function(e) {
+  e.ports[0].postMessage({
+    "headers": %(headers)s
+  });
+};
diff --git a/test/wpt/tests/common/security-features/subresource/template/static-import.js.template b/test/wpt/tests/common/security-features/subresource/template/static-import.js.template
new file mode 100644
index 00000000000..095459b5475
--- /dev/null
+++ b/test/wpt/tests/common/security-features/subresource/template/static-import.js.template
@@ -0,0 +1 @@
+import '%(import_url)s';
diff --git a/test/wpt/tests/common/security-features/subresource/template/svg.css.template b/test/wpt/tests/common/security-features/subresource/template/svg.css.template
new file mode 100644
index 00000000000..c2e509cc3b8
--- /dev/null
+++ b/test/wpt/tests/common/security-features/subresource/template/svg.css.template
@@ -0,0 +1,3 @@
+path {
+  %(property)s: url(/common/security-features/subresource/svg.py?id=%(id)s#invalidFragment);
+}
diff --git a/test/wpt/tests/common/security-features/subresource/template/svg.embedded.template b/test/wpt/tests/common/security-features/subresource/template/svg.embedded.template
new file mode 100644
index 00000000000..5986c4800a7
--- /dev/null
+++ b/test/wpt/tests/common/security-features/subresource/template/svg.embedded.template
@@ -0,0 +1,5 @@
+<?xml version='1.0' standalone='no'?>
+<?xml-stylesheet href='stylesheet.py?id=%(id)s&amp;type=svg&amp;property=%(property)s' type='text/css'?>
+<svg xmlns='http://www.w3.org/2000/svg'>
+  <path d='M 50,5 95,100 5,100 z' />
+</svg>
diff --git a/test/wpt/tests/common/security-features/subresource/template/worker.js.template b/test/wpt/tests/common/security-features/subresource/template/worker.js.template
new file mode 100644
index 00000000000..817dd8c87ac
--- /dev/null
+++ b/test/wpt/tests/common/security-features/subresource/template/worker.js.template
@@ -0,0 +1,3 @@
+postMessage({
+  "headers": %(headers)s
+});
diff --git a/test/wpt/tests/common/security-features/subresource/video.py b/test/wpt/tests/common/security-features/subresource/video.py
new file mode 100644
index 00000000000..7cfbbfa68c8
--- /dev/null
+++ b/test/wpt/tests/common/security-features/subresource/video.py
@@ -0,0 +1,17 @@
+import os, sys
+from wptserve.utils import isomorphic_decode
+import importlib
+subresource = importlib.import_module("common.security-features.subresource.subresource")
+
+def generate_payload(request, server_data):
+    file = os.path.join(request.doc_root, u"media", u"movie_5.ogv")
+    return open(file, "rb").read()
+
+
+def main(request, response):
+    handler = lambda data: generate_payload(request, data)
+    subresource.respond(request,
+                        response,
+                        payload_generator = handler,
+                        access_control_allow_origin = b"*",
+                        content_type = b"video/ogg")
diff --git a/test/wpt/tests/common/security-features/subresource/worker.py b/test/wpt/tests/common/security-features/subresource/worker.py
new file mode 100644
index 00000000000..f655633b5db
--- /dev/null
+++ b/test/wpt/tests/common/security-features/subresource/worker.py
@@ -0,0 +1,13 @@
+import os, sys
+from wptserve.utils import isomorphic_decode
+import importlib
+subresource = importlib.import_module("common.security-features.subresource.subresource")
+
+def generate_payload(server_data):
+    return subresource.get_template(u"worker.js.template") % server_data
+
+def main(request, response):
+    subresource.respond(request,
+                        response,
+                        payload_generator = generate_payload,
+                        content_type = b"application/javascript")
diff --git a/test/wpt/tests/common/security-features/subresource/xhr.py b/test/wpt/tests/common/security-features/subresource/xhr.py
new file mode 100644
index 00000000000..75921e91569
--- /dev/null
+++ b/test/wpt/tests/common/security-features/subresource/xhr.py
@@ -0,0 +1,16 @@
+import os, sys
+from wptserve.utils import isomorphic_decode
+import importlib
+subresource = importlib.import_module("common.security-features.subresource.subresource")
+
+def generate_payload(server_data):
+    data = (u'{"headers": %(headers)s}') % server_data
+    return data
+
+def main(request, response):
+    subresource.respond(request,
+                        response,
+                        payload_generator = generate_payload,
+                        access_control_allow_origin = b"*",
+                        content_type = b"application/json",
+                        cache_control = b"no-store")
diff --git a/test/wpt/tests/common/security-features/tools/format_spec_src_json.py b/test/wpt/tests/common/security-features/tools/format_spec_src_json.py
new file mode 100644
index 00000000000..d1bf5817ad2
--- /dev/null
+++ b/test/wpt/tests/common/security-features/tools/format_spec_src_json.py
@@ -0,0 +1,24 @@
+import collections
+import json
+import os
+
+
+def main():
+    '''Formats spec.src.json.'''
+    script_directory = os.path.dirname(os.path.abspath(__file__))
+    for dir in [
+            'mixed-content', 'referrer-policy', 'referrer-policy/4K-1',
+            'referrer-policy/4K', 'referrer-policy/4K+1',
+            'upgrade-insecure-requests'
+    ]:
+        filename = os.path.join(script_directory, '..', '..', '..', dir,
+                                'spec.src.json')
+        spec = json.load(
+            open(filename, 'r'), object_pairs_hook=collections.OrderedDict)
+        with open(filename, 'w') as f:
+            f.write(json.dumps(spec, indent=2, separators=(',', ': ')))
+            f.write('\n')
+
+
+if __name__ == '__main__':
+    main()
diff --git a/test/wpt/tests/common/security-features/tools/generate.py b/test/wpt/tests/common/security-features/tools/generate.py
new file mode 100644
index 00000000000..176e0ebbebc
--- /dev/null
+++ b/test/wpt/tests/common/security-features/tools/generate.py
@@ -0,0 +1,464 @@
+#!/usr/bin/env python3
+
+from __future__ import print_function
+
+import argparse
+import collections
+import copy
+import json
+import os
+import sys
+
+import spec_validator
+import util
+
+
+def expand_pattern(expansion_pattern, test_expansion_schema):
+    expansion = {}
+    for artifact_key in expansion_pattern:
+        artifact_value = expansion_pattern[artifact_key]
+        if artifact_value == '*':
+            expansion[artifact_key] = test_expansion_schema[artifact_key]
+        elif isinstance(artifact_value, list):
+            expansion[artifact_key] = artifact_value
+        elif isinstance(artifact_value, dict):
+            # Flattened expansion.
+            expansion[artifact_key] = []
+            values_dict = expand_pattern(artifact_value,
+                                         test_expansion_schema[artifact_key])
+            for sub_key in values_dict.keys():
+                expansion[artifact_key] += values_dict[sub_key]
+        else:
+            expansion[artifact_key] = [artifact_value]
+
+    return expansion
+
+
+def permute_expansion(expansion,
+                      artifact_order,
+                      selection={},
+                      artifact_index=0):
+    assert isinstance(artifact_order, list), "artifact_order should be a list"
+
+    if artifact_index >= len(artifact_order):
+        yield selection
+        return
+
+    artifact_key = artifact_order[artifact_index]
+
+    for artifact_value in expansion[artifact_key]:
+        selection[artifact_key] = artifact_value
+        for next_selection in permute_expansion(expansion, artifact_order,
+                                                selection, artifact_index + 1):
+            yield next_selection
+
+
+# Dumps the test config `selection` into a serialized JSON string.
+def dump_test_parameters(selection):
+    return json.dumps(
+        selection,
+        indent=2,
+        separators=(',', ': '),
+        sort_keys=True,
+        cls=util.CustomEncoder)
+
+
+def get_test_filename(spec_directory, spec_json, selection):
+    '''Returns the filname for the main test HTML file'''
+
+    selection_for_filename = copy.deepcopy(selection)
+    # Use 'unset' rather than 'None' in test filenames.
+    if selection_for_filename['delivery_value'] is None:
+        selection_for_filename['delivery_value'] = 'unset'
+
+    return os.path.join(
+        spec_directory,
+        spec_json['test_file_path_pattern'] % selection_for_filename)
+
+
+def get_csp_value(value):
+    '''
+    Returns actual CSP header values (e.g. "worker-src 'self'") for the
+    given string used in PolicyDelivery's value (e.g. "worker-src-self").
+    '''
+
+    # script-src
+    # Test-related scripts like testharness.js and inline scripts containing
+    # test bodies.
+    # 'unsafe-inline' is added as a workaround here. This is probably not so
+    # bad, as it shouldn't intefere non-inline-script requests that we want to
+    # test.
+    if value == 'script-src-wildcard':
+        return "script-src * 'unsafe-inline'"
+    if value == 'script-src-self':
+        return "script-src 'self' 'unsafe-inline'"
+    # Workaround for "script-src 'none'" would be more complicated, because
+    # - "script-src 'none' 'unsafe-inline'" is handled somehow differently from
+    #   "script-src 'none'", i.e.
+    #   https://w3c.github.io/webappsec-csp/#match-url-to-source-list Step 3
+    #   handles the latter but not the former.
+    # - We need nonce- or path-based additional values to allow same-origin
+    #   test scripts like testharness.js.
+    # Therefore, we disable 'script-src-none' tests for now in
+    # `/content-security-policy/spec.src.json`.
+    if value == 'script-src-none':
+        return "script-src 'none'"
+
+    # worker-src
+    if value == 'worker-src-wildcard':
+        return 'worker-src *'
+    if value == 'worker-src-self':
+        return "worker-src 'self'"
+    if value == 'worker-src-none':
+        return "worker-src 'none'"
+    raise Exception('Invalid delivery_value: %s' % value)
+
+def handle_deliveries(policy_deliveries):
+    '''
+    Generate <meta> elements and HTTP headers for the given list of
+    PolicyDelivery.
+    TODO(hiroshige): Merge duplicated code here, scope/document.py, etc.
+    '''
+
+    meta = ''
+    headers = {}
+
+    for delivery in policy_deliveries:
+        if delivery.value is None:
+            continue
+        if delivery.key == 'referrerPolicy':
+            if delivery.delivery_type == 'meta':
+                meta += \
+                    '<meta name="referrer" content="%s">' % delivery.value
+            elif delivery.delivery_type == 'http-rp':
+                headers['Referrer-Policy'] = delivery.value
+                # TODO(kristijanburnik): Limit to WPT origins.
+                headers['Access-Control-Allow-Origin'] = '*'
+            else:
+                raise Exception(
+                    'Invalid delivery_type: %s' % delivery.delivery_type)
+        elif delivery.key == 'mixedContent':
+            assert (delivery.value == 'opt-in')
+            if delivery.delivery_type == 'meta':
+                meta += '<meta http-equiv="Content-Security-Policy" ' + \
+                       'content="block-all-mixed-content">'
+            elif delivery.delivery_type == 'http-rp':
+                headers['Content-Security-Policy'] = 'block-all-mixed-content'
+            else:
+                raise Exception(
+                    'Invalid delivery_type: %s' % delivery.delivery_type)
+        elif delivery.key == 'contentSecurityPolicy':
+            csp_value = get_csp_value(delivery.value)
+            if delivery.delivery_type == 'meta':
+                meta += '<meta http-equiv="Content-Security-Policy" ' + \
+                       'content="' + csp_value + '">'
+            elif delivery.delivery_type == 'http-rp':
+                headers['Content-Security-Policy'] = csp_value
+            else:
+                raise Exception(
+                    'Invalid delivery_type: %s' % delivery.delivery_type)
+        elif delivery.key == 'upgradeInsecureRequests':
+            # https://w3c.github.io/webappsec-upgrade-insecure-requests/#delivery
+            assert (delivery.value == 'upgrade')
+            if delivery.delivery_type == 'meta':
+                meta += '<meta http-equiv="Content-Security-Policy" ' + \
+                       'content="upgrade-insecure-requests">'
+            elif delivery.delivery_type == 'http-rp':
+                headers[
+                    'Content-Security-Policy'] = 'upgrade-insecure-requests'
+            else:
+                raise Exception(
+                    'Invalid delivery_type: %s' % delivery.delivery_type)
+        else:
+            raise Exception('Invalid delivery_key: %s' % delivery.key)
+    return {"meta": meta, "headers": headers}
+
+
+def generate_selection(spec_json, selection):
+    '''
+    Returns a scenario object (with a top-level source_context_list entry,
+    which will be removed in generate_test_file() later).
+    '''
+
+    target_policy_delivery = util.PolicyDelivery(selection['delivery_type'],
+                                                 selection['delivery_key'],
+                                                 selection['delivery_value'])
+    del selection['delivery_type']
+    del selection['delivery_key']
+    del selection['delivery_value']
+
+    # Parse source context list and policy deliveries of source contexts.
+    # `util.ShouldSkip()` exceptions are raised if e.g. unsuppported
+    # combinations of source contexts and policy deliveries are used.
+    source_context_list_scheme = spec_json['source_context_list_schema'][
+        selection['source_context_list']]
+    selection['source_context_list'] = [
+        util.SourceContext.from_json(source_context, target_policy_delivery,
+                                     spec_json['source_context_schema'])
+        for source_context in source_context_list_scheme['sourceContextList']
+    ]
+
+    # Check if the subresource is supported by the innermost source context.
+    innermost_source_context = selection['source_context_list'][-1]
+    supported_subresource = spec_json['source_context_schema'][
+        'supported_subresource'][innermost_source_context.source_context_type]
+    if supported_subresource != '*':
+        if selection['subresource'] not in supported_subresource:
+            raise util.ShouldSkip()
+
+    # Parse subresource policy deliveries.
+    selection[
+        'subresource_policy_deliveries'] = util.PolicyDelivery.list_from_json(
+            source_context_list_scheme['subresourcePolicyDeliveries'],
+            target_policy_delivery, spec_json['subresource_schema']
+            ['supported_delivery_type'][selection['subresource']])
+
+    # Generate per-scenario test description.
+    selection['test_description'] = spec_json[
+        'test_description_template'] % selection
+
+    return selection
+
+
+def generate_test_file(spec_directory, test_helper_filenames,
+                       test_html_template_basename, test_filename, scenarios):
+    '''
+    Generates a test HTML file (and possibly its associated .headers file)
+    from `scenarios`.
+    '''
+
+    # Scenarios for the same file should have the same `source_context_list`,
+    # including the top-level one.
+    # Note: currently, non-top-level source contexts aren't necessarily required
+    # to be the same, but we set this requirement as it will be useful e.g. when
+    # we e.g. reuse a worker among multiple scenarios.
+    for scenario in scenarios:
+        assert (scenario['source_context_list'] == scenarios[0]
+                ['source_context_list'])
+
+    # We process the top source context below, and do not include it in
+    # the JSON objects (i.e. `scenarios`) in generated HTML files.
+    top_source_context = scenarios[0]['source_context_list'].pop(0)
+    assert (top_source_context.source_context_type == 'top')
+    for scenario in scenarios[1:]:
+        assert (scenario['source_context_list'].pop(0) == top_source_context)
+
+    parameters = {}
+
+    # Sort scenarios, to avoid unnecessary diffs due to different orders in
+    # `scenarios`.
+    serialized_scenarios = sorted(
+        [dump_test_parameters(scenario) for scenario in scenarios])
+
+    parameters['scenarios'] = ",\n".join(serialized_scenarios).replace(
+        "\n", "\n" + " " * 10)
+
+    test_directory = os.path.dirname(test_filename)
+
+    parameters['helper_js'] = ""
+    for test_helper_filename in test_helper_filenames:
+        parameters['helper_js'] += '    <script src="%s"></script>\n' % (
+            os.path.relpath(test_helper_filename, test_directory))
+    parameters['sanity_checker_js'] = os.path.relpath(
+        os.path.join(spec_directory, 'generic', 'sanity-checker.js'),
+        test_directory)
+    parameters['spec_json_js'] = os.path.relpath(
+        os.path.join(spec_directory, 'generic', 'spec_json.js'),
+        test_directory)
+
+    test_headers_filename = test_filename + ".headers"
+
+    test_html_template = util.get_template(test_html_template_basename)
+    disclaimer_template = util.get_template('disclaimer.template')
+
+    html_template_filename = os.path.join(util.template_directory,
+                                          test_html_template_basename)
+    generated_disclaimer = disclaimer_template \
+        % {'generating_script_filename': os.path.relpath(sys.argv[0],
+                                                         util.test_root_directory),
+           'spec_directory': os.path.relpath(spec_directory,
+                                             util.test_root_directory)}
+
+    # Adjust the template for the test invoking JS. Indent it to look nice.
+    parameters['generated_disclaimer'] = generated_disclaimer.rstrip()
+
+    # Directory for the test files.
+    try:
+        os.makedirs(test_directory)
+    except:
+        pass
+
+    delivery = handle_deliveries(top_source_context.policy_deliveries)
+
+    if len(delivery['headers']) > 0:
+        with open(test_headers_filename, "w") as f:
+            for header in delivery['headers']:
+                f.write('%s: %s\n' % (header, delivery['headers'][header]))
+
+    parameters['meta_delivery_method'] = delivery['meta']
+    # Obey the lint and pretty format.
+    if len(parameters['meta_delivery_method']) > 0:
+        parameters['meta_delivery_method'] = "\n    " + \
+                                            parameters['meta_delivery_method']
+
+    # Write out the generated HTML file.
+    util.write_file(test_filename, test_html_template % parameters)
+
+
+def generate_test_source_files(spec_directory, test_helper_filenames,
+                               spec_json, target):
+    test_expansion_schema = spec_json['test_expansion_schema']
+    specification = spec_json['specification']
+
+    if target == "debug":
+        spec_json_js_template = util.get_template('spec_json.js.template')
+        util.write_file(
+            os.path.join(spec_directory, "generic", "spec_json.js"),
+            spec_json_js_template % {'spec_json': json.dumps(spec_json)})
+        util.write_file(
+            os.path.join(spec_directory, "generic",
+                         "debug-output.spec.src.json"),
+            json.dumps(spec_json, indent=2, separators=(',', ': ')))
+
+    # Choose a debug/release template depending on the target.
+    html_template = "test.%s.html.template" % target
+
+    artifact_order = test_expansion_schema.keys()
+    artifact_order.remove('expansion')
+
+    excluded_selection_pattern = ''
+    for key in artifact_order:
+        excluded_selection_pattern += '%(' + key + ')s/'
+
+    # Create list of excluded tests.
+    exclusion_dict = set()
+    for excluded_pattern in spec_json['excluded_tests']:
+        excluded_expansion = \
+            expand_pattern(excluded_pattern, test_expansion_schema)
+        for excluded_selection in permute_expansion(excluded_expansion,
+                                                    artifact_order):
+            excluded_selection['delivery_key'] = spec_json['delivery_key']
+            exclusion_dict.add(excluded_selection_pattern % excluded_selection)
+
+    # `scenarios[filename]` represents the list of scenario objects to be
+    # generated into `filename`.
+    scenarios = {}
+
+    for spec in specification:
+        # Used to make entries with expansion="override" override preceding
+        # entries with the same |selection_path|.
+        output_dict = {}
+
+        for expansion_pattern in spec['test_expansion']:
+            expansion = expand_pattern(expansion_pattern,
+                                       test_expansion_schema)
+            for selection in permute_expansion(expansion, artifact_order):
+                selection['delivery_key'] = spec_json['delivery_key']
+                selection_path = spec_json['selection_pattern'] % selection
+                if selection_path in output_dict:
+                    if expansion_pattern['expansion'] != 'override':
+                        print("Error: expansion is default in:")
+                        print(dump_test_parameters(selection))
+                        print("but overrides:")
+                        print(dump_test_parameters(
+                            output_dict[selection_path]))
+                        sys.exit(1)
+                output_dict[selection_path] = copy.deepcopy(selection)
+
+        for selection_path in output_dict:
+            selection = output_dict[selection_path]
+            if (excluded_selection_pattern % selection) in exclusion_dict:
+                print('Excluding selection:', selection_path)
+                continue
+            try:
+                test_filename = get_test_filename(spec_directory, spec_json,
+                                                  selection)
+                scenario = generate_selection(spec_json, selection)
+                scenarios[test_filename] = scenarios.get(test_filename,
+                                                         []) + [scenario]
+            except util.ShouldSkip:
+                continue
+
+    for filename in scenarios:
+        generate_test_file(spec_directory, test_helper_filenames,
+                           html_template, filename, scenarios[filename])
+
+
+def merge_json(base, child):
+    for key in child:
+        if key not in base:
+            base[key] = child[key]
+            continue
+        # `base[key]` and `child[key]` both exists.
+        if isinstance(base[key], list) and isinstance(child[key], list):
+            base[key].extend(child[key])
+        elif isinstance(base[key], dict) and isinstance(child[key], dict):
+            merge_json(base[key], child[key])
+        else:
+            base[key] = child[key]
+
+
+def main():
+    parser = argparse.ArgumentParser(
+        description='Test suite generator utility')
+    parser.add_argument(
+        '-t',
+        '--target',
+        type=str,
+        choices=("release", "debug"),
+        default="release",
+        help='Sets the appropriate template for generating tests')
+    parser.add_argument(
+        '-s',
+        '--spec',
+        type=str,
+        default=os.getcwd(),
+        help='Specify a file used for describing and generating the tests')
+    # TODO(kristijanburnik): Add option for the spec_json file.
+    args = parser.parse_args()
+
+    spec_directory = os.path.abspath(args.spec)
+
+    # Read `spec.src.json` files, starting from `spec_directory`, and
+    # continuing to parent directories as long as `spec.src.json` exists.
+    spec_filenames = []
+    test_helper_filenames = []
+    spec_src_directory = spec_directory
+    while len(spec_src_directory) >= len(util.test_root_directory):
+        spec_filename = os.path.join(spec_src_directory, "spec.src.json")
+        if not os.path.exists(spec_filename):
+            break
+        spec_filenames.append(spec_filename)
+        test_filename = os.path.join(spec_src_directory, 'generic',
+                                     'test-case.sub.js')
+        assert (os.path.exists(test_filename))
+        test_helper_filenames.append(test_filename)
+        spec_src_directory = os.path.abspath(
+            os.path.join(spec_src_directory, ".."))
+
+    spec_filenames = list(reversed(spec_filenames))
+    test_helper_filenames = list(reversed(test_helper_filenames))
+
+    if len(spec_filenames) == 0:
+        print('Error: No spec.src.json is found at %s.' % spec_directory)
+        return
+
+    # Load the default spec JSON file, ...
+    default_spec_filename = os.path.join(util.script_directory,
+                                         'spec.src.json')
+    spec_json = collections.OrderedDict()
+    if os.path.exists(default_spec_filename):
+        spec_json = util.load_spec_json(default_spec_filename)
+
+    # ... and then make spec JSON files in subdirectories override the default.
+    for spec_filename in spec_filenames:
+        child_spec_json = util.load_spec_json(spec_filename)
+        merge_json(spec_json, child_spec_json)
+
+    spec_validator.assert_valid_spec_json(spec_json)
+    generate_test_source_files(spec_directory, test_helper_filenames,
+                               spec_json, args.target)
+
+
+if __name__ == '__main__':
+    main()
diff --git a/test/wpt/tests/common/security-features/tools/spec.src.json b/test/wpt/tests/common/security-features/tools/spec.src.json
new file mode 100644
index 00000000000..4a84493f475
--- /dev/null
+++ b/test/wpt/tests/common/security-features/tools/spec.src.json
@@ -0,0 +1,533 @@
+{
+  "selection_pattern": "%(source_context_list)s.%(delivery_type)s/%(delivery_value)s/%(subresource)s/%(origin)s.%(redirection)s.%(source_scheme)s",
+  "test_file_path_pattern": "gen/%(source_context_list)s.%(delivery_type)s/%(delivery_value)s/%(subresource)s.%(source_scheme)s.html",
+  "excluded_tests": [
+    {
+      // Workers are same-origin only
+      "expansion": "*",
+      "source_scheme": "*",
+      "source_context_list": "*",
+      "delivery_type": "*",
+      "delivery_value": "*",
+      "redirection": "*",
+      "subresource": [
+        "worker-classic",
+        "worker-module",
+        "sharedworker-classic",
+        "sharedworker-module"
+      ],
+      "origin": [
+        "cross-https",
+        "cross-http",
+        "cross-http-downgrade",
+        "cross-wss",
+        "cross-ws",
+        "cross-ws-downgrade"
+      ],
+      "expectation": "*"
+    },
+    {
+      // Workers are same-origin only (redirects)
+      "expansion": "*",
+      "source_scheme": "*",
+      "source_context_list": "*",
+      "delivery_type": "*",
+      "delivery_value": "*",
+      "redirection": [
+        "swap-origin",
+        "swap-scheme"
+      ],
+      "subresource": [
+        "worker-classic",
+        "worker-module",
+        "sharedworker-classic",
+        "sharedworker-module"
+      ],
+      "origin": "*",
+      "expectation": "*"
+    },
+    {
+      // Websockets are ws/wss-only
+      "expansion": "*",
+      "source_scheme": "*",
+      "source_context_list": "*",
+      "delivery_type": "*",
+      "delivery_value": "*",
+      "redirection": "*",
+      "subresource": "websocket",
+      "origin": [
+        "same-https",
+        "same-http",
+        "same-http-downgrade",
+        "cross-https",
+        "cross-http",
+        "cross-http-downgrade"
+      ],
+      "expectation": "*"
+    },
+    {
+      // Redirects are intentionally forbidden in browsers:
+      // https://fetch.spec.whatwg.org/#concept-websocket-establish
+      // Websockets are no-redirect only
+      "expansion": "*",
+      "source_scheme": "*",
+      "source_context_list": "*",
+      "delivery_type": "*",
+      "delivery_value": "*",
+      "redirection": [
+        "keep-origin",
+        "swap-origin",
+        "keep-scheme",
+        "swap-scheme",
+        "downgrade"
+      ],
+      "subresource": "websocket",
+      "origin": "*",
+      "expectation": "*"
+    },
+    {
+      // ws/wss are websocket-only
+      "expansion": "*",
+      "source_scheme": "*",
+      "source_context_list": "*",
+      "delivery_type": "*",
+      "delivery_value": "*",
+      "redirection": "*",
+      "subresource": [
+        "a-tag",
+        "area-tag",
+        "audio-tag",
+        "beacon",
+        "fetch",
+        "iframe-tag",
+        "img-tag",
+        "link-css-tag",
+        "link-prefetch-tag",
+        "object-tag",
+        "picture-tag",
+        "script-tag",
+        "script-tag-dynamic-import",
+        "sharedworker-classic",
+        "sharedworker-import",
+        "sharedworker-import-data",
+        "sharedworker-module",
+        "video-tag",
+        "worker-classic",
+        "worker-import",
+        "worker-import-data",
+        "worker-module",
+        "worklet-animation",
+        "worklet-animation-import-data",
+        "worklet-audio",
+        "worklet-audio-import-data",
+        "worklet-layout",
+        "worklet-layout-import-data",
+        "worklet-paint",
+        "worklet-paint-import-data",
+        "xhr"
+      ],
+      "origin": [
+        "same-wss",
+        "same-ws",
+        "same-ws-downgrade",
+        "cross-wss",
+        "cross-ws",
+        "cross-ws-downgrade"
+      ],
+      "expectation": "*"
+    },
+    {
+      // Worklets are HTTPS contexts only
+      "expansion": "*",
+      "source_scheme": "http",
+      "source_context_list": "*",
+      "delivery_type": "*",
+      "delivery_value": "*",
+      "redirection": "*",
+      "subresource": [
+        "worklet-animation",
+        "worklet-animation-import-data",
+        "worklet-audio",
+        "worklet-audio-import-data",
+        "worklet-layout",
+        "worklet-layout-import-data",
+        "worklet-paint",
+        "worklet-paint-import-data"
+      ],
+      "origin": "*",
+      "expectation": "*"
+    }
+  ],
+  "source_context_schema": {
+    "supported_subresource": {
+      "top": "*",
+      "iframe": "*",
+      "iframe-blank": "*",
+      "srcdoc": "*",
+      "worker-classic": [
+        "xhr",
+        "fetch",
+        "websocket",
+        "worker-classic",
+        "worker-module"
+      ],
+      "worker-module": [
+        "xhr",
+        "fetch",
+        "websocket",
+        "worker-classic",
+        "worker-module"
+      ],
+      "worker-classic-data": [
+        "xhr",
+        "fetch",
+        "websocket"
+      ],
+      "worker-module-data": [
+        "xhr",
+        "fetch",
+        "websocket"
+      ],
+      "sharedworker-classic": [
+        "xhr",
+        "fetch",
+        "websocket"
+      ],
+      "sharedworker-module": [
+        "xhr",
+        "fetch",
+        "websocket"
+      ],
+      "sharedworker-classic-data": [
+        "xhr",
+        "fetch",
+        "websocket"
+      ],
+      "sharedworker-module-data": [
+        "xhr",
+        "fetch",
+        "websocket"
+      ]
+    }
+  },
+  "source_context_list_schema": {
+    // Warning: Currently, some nested patterns of contexts have different
+    // inheritance rules for different kinds of policies.
+    // The generated tests will be used to test/investigate the policy
+    // inheritance rules, and eventually the policy inheritance rules will
+    // be unified (https://github.com/w3ctag/design-principles/issues/111).
+    "top": {
+      "description": "Policy set by the top-level Document",
+      "sourceContextList": [
+        {
+          "sourceContextType": "top",
+          "policyDeliveries": [
+            "policy"
+          ]
+        }
+      ],
+      "subresourcePolicyDeliveries": []
+    },
+    "req": {
+      "description": "Subresource request's policy should override Document's policy",
+      "sourceContextList": [
+        {
+          "sourceContextType": "top",
+          "policyDeliveries": [
+            "anotherPolicy"
+          ]
+        }
+      ],
+      "subresourcePolicyDeliveries": [
+        "nonNullPolicy"
+      ]
+    },
+    "srcdoc-inherit": {
+      "description": "srcdoc iframe without its own policy should inherit parent Document's policy",
+      "sourceContextList": [
+        {
+          "sourceContextType": "top",
+          "policyDeliveries": [
+            "policy"
+          ]
+        },
+        {
+          "sourceContextType": "srcdoc"
+        }
+      ],
+      "subresourcePolicyDeliveries": []
+    },
+    "srcdoc": {
+      "description": "srcdoc iframe's policy should override parent Document's policy",
+      "sourceContextList": [
+        {
+          "sourceContextType": "top",
+          "policyDeliveries": [
+            "anotherPolicy"
+          ]
+        },
+        {
+          "sourceContextType": "srcdoc",
+          "policyDeliveries": [
+            "nonNullPolicy"
+          ]
+        }
+      ],
+      "subresourcePolicyDeliveries": []
+    },
+    "iframe": {
+      "description": "external iframe's policy should override parent Document's policy",
+      "sourceContextList": [
+        {
+          "sourceContextType": "top",
+          "policyDeliveries": [
+            "anotherPolicy"
+          ]
+        },
+        {
+          "sourceContextType": "iframe",
+          "policyDeliveries": [
+            "policy"
+          ]
+        }
+      ],
+      "subresourcePolicyDeliveries": []
+    },
+    "iframe-blank-inherit": {
+      "description": "blank iframe should inherit parent Document's policy",
+      "sourceContextList": [
+        {
+          "sourceContextType": "top",
+          "policyDeliveries": [
+            "policy"
+          ]
+        },
+        {
+          "sourceContextType": "iframe-blank"
+        }
+      ],
+      "subresourcePolicyDeliveries": []
+    },
+    "worker-classic": {
+      // This is applicable to referrer-policy tests.
+      // Use "worker-classic-inherit" for CSP (mixed-content, etc.).
+      "description": "dedicated workers shouldn't inherit its parent's policy.",
+      "sourceContextList": [
+        {
+          "sourceContextType": "top",
+          "policyDeliveries": [
+            "anotherPolicy"
+          ]
+        },
+        {
+          "sourceContextType": "worker-classic",
+          "policyDeliveries": [
+            "policy"
+          ]
+        }
+      ],
+      "subresourcePolicyDeliveries": []
+    },
+    "worker-classic-data": {
+      "description": "data: dedicated workers should inherit its parent's policy.",
+      "sourceContextList": [
+        {
+          "sourceContextType": "top",
+          "policyDeliveries": [
+            "policy"
+          ]
+        },
+        {
+          "sourceContextType": "worker-classic-data",
+          "policyDeliveries": []
+        }
+      ],
+      "subresourcePolicyDeliveries": []
+    },
+    "worker-module": {
+      // This is applicable to referrer-policy tests.
+      "description": "dedicated workers shouldn't inherit its parent's policy.",
+      "sourceContextList": [
+        {
+          "sourceContextType": "top",
+          "policyDeliveries": [
+            "anotherPolicy"
+          ]
+        },
+        {
+          "sourceContextType": "worker-module",
+          "policyDeliveries": [
+            "policy"
+          ]
+        }
+      ],
+      "subresourcePolicyDeliveries": []
+    },
+    "worker-module-data": {
+      "description": "data: dedicated workers should inherit its parent's policy.",
+      "sourceContextList": [
+        {
+          "sourceContextType": "top",
+          "policyDeliveries": [
+            "policy"
+          ]
+        },
+        {
+          "sourceContextType": "worker-module-data",
+          "policyDeliveries": []
+        }
+      ],
+      "subresourcePolicyDeliveries": []
+    },
+    "sharedworker-classic": {
+      "description": "shared workers shouldn't inherit its parent's policy.",
+      "sourceContextList": [
+        {
+          "sourceContextType": "top",
+          "policyDeliveries": [
+            "anotherPolicy"
+          ]
+        },
+        {
+          "sourceContextType": "sharedworker-classic",
+          "policyDeliveries": [
+            "policy"
+          ]
+        }
+      ],
+      "subresourcePolicyDeliveries": []
+    },
+    "sharedworker-classic-data": {
+      "description": "data: shared workers should inherit its parent's policy.",
+      "sourceContextList": [
+        {
+          "sourceContextType": "top",
+          "policyDeliveries": [
+            "policy"
+          ]
+        },
+        {
+          "sourceContextType": "sharedworker-classic-data",
+          "policyDeliveries": []
+        }
+      ],
+      "subresourcePolicyDeliveries": []
+    },
+    "sharedworker-module": {
+      "description": "shared workers shouldn't inherit its parent's policy.",
+      "sourceContextList": [
+        {
+          "sourceContextType": "top",
+          "policyDeliveries": [
+            "anotherPolicy"
+          ]
+        },
+        {
+          "sourceContextType": "sharedworker-module",
+          "policyDeliveries": [
+            "policy"
+          ]
+        }
+      ],
+      "subresourcePolicyDeliveries": []
+    },
+    "sharedworker-module-data": {
+      "description": "data: shared workers should inherit its parent's policy.",
+      "sourceContextList": [
+        {
+          "sourceContextType": "top",
+          "policyDeliveries": [
+            "policy"
+          ]
+        },
+        {
+          "sourceContextType": "sharedworker-module-data",
+          "policyDeliveries": []
+        }
+      ],
+      "subresourcePolicyDeliveries": []
+    }
+  },
+  "test_expansion_schema": {
+    "expansion": [
+      "default",
+      "override"
+    ],
+    "source_scheme": [
+      "http",
+      "https"
+    ],
+    "source_context_list": [
+      "top",
+      "req",
+      "srcdoc-inherit",
+      "srcdoc",
+      "iframe",
+      "iframe-blank-inherit",
+      "worker-classic",
+      "worker-classic-data",
+      "worker-module",
+      "worker-module-data",
+      "sharedworker-classic",
+      "sharedworker-classic-data",
+      "sharedworker-module",
+      "sharedworker-module-data"
+    ],
+    "redirection": [
+      "no-redirect",
+      "keep-origin",
+      "swap-origin",
+      "keep-scheme",
+      "swap-scheme",
+      "downgrade"
+    ],
+    "origin": [
+      "same-https",
+      "same-http",
+      "same-http-downgrade",
+      "cross-https",
+      "cross-http",
+      "cross-http-downgrade",
+      "same-wss",
+      "same-ws",
+      "same-ws-downgrade",
+      "cross-wss",
+      "cross-ws",
+      "cross-ws-downgrade"
+    ],
+    "subresource": [
+      "a-tag",
+      "area-tag",
+      "audio-tag",
+      "beacon",
+      "fetch",
+      "iframe-tag",
+      "img-tag",
+      "link-css-tag",
+      "link-prefetch-tag",
+      "object-tag",
+      "picture-tag",
+      "script-tag",
+      "script-tag-dynamic-import",
+      "sharedworker-classic",
+      "sharedworker-import",
+      "sharedworker-import-data",
+      "sharedworker-module",
+      "video-tag",
+      "websocket",
+      "worker-classic",
+      "worker-import",
+      "worker-import-data",
+      "worker-module",
+      "worklet-animation",
+      "worklet-animation-import-data",
+      "worklet-audio",
+      "worklet-audio-import-data",
+      "worklet-layout",
+      "worklet-layout-import-data",
+      "worklet-paint",
+      "worklet-paint-import-data",
+      "xhr"
+    ]
+  }
+}
diff --git a/test/wpt/tests/common/security-features/tools/spec_validator.py b/test/wpt/tests/common/security-features/tools/spec_validator.py
new file mode 100644
index 00000000000..3ac3f530169
--- /dev/null
+++ b/test/wpt/tests/common/security-features/tools/spec_validator.py
@@ -0,0 +1,253 @@
+#!/usr/bin/env python3
+
+from __future__ import print_function
+
+import json, sys
+
+
+def assert_non_empty_string(obj, field):
+    assert field in obj, 'Missing field "%s"' % field
+    assert isinstance(obj[field], basestring), \
+        'Field "%s" must be a string' % field
+    assert len(obj[field]) > 0, 'Field "%s" must not be empty' % field
+
+
+def assert_non_empty_list(obj, field):
+    assert isinstance(obj[field], list), \
+        '%s must be a list' % field
+    assert len(obj[field]) > 0, \
+        '%s list must not be empty' % field
+
+
+def assert_non_empty_dict(obj, field):
+    assert isinstance(obj[field], dict), \
+        '%s must be a dict' % field
+    assert len(obj[field]) > 0, \
+        '%s dict must not be empty' % field
+
+
+def assert_contains(obj, field):
+    assert field in obj, 'Must contain field "%s"' % field
+
+
+def assert_value_from(obj, field, items):
+    assert obj[field] in items, \
+         'Field "%s" must be from: %s' % (field, str(items))
+
+
+def assert_atom_or_list_items_from(obj, field, items):
+    if isinstance(obj[field], basestring) or isinstance(
+            obj[field], int) or obj[field] is None:
+        assert_value_from(obj, field, items)
+        return
+
+    assert isinstance(obj[field], list), '%s must be a list' % field
+    for allowed_value in obj[field]:
+        assert allowed_value != '*', "Wildcard is not supported for lists!"
+        assert allowed_value in items, \
+            'Field "%s" must be from: %s' % (field, str(items))
+
+
+def assert_contains_only_fields(obj, expected_fields):
+    for expected_field in expected_fields:
+        assert_contains(obj, expected_field)
+
+    for actual_field in obj:
+        assert actual_field in expected_fields, \
+                'Unexpected field "%s".' % actual_field
+
+
+def leaf_values(schema):
+    if isinstance(schema, list):
+        return schema
+    ret = []
+    for _, sub_schema in schema.iteritems():
+        ret += leaf_values(sub_schema)
+    return ret
+
+
+def assert_value_unique_in(value, used_values):
+    assert value not in used_values, 'Duplicate value "%s"!' % str(value)
+    used_values[value] = True
+
+
+def assert_valid_artifact(exp_pattern, artifact_key, schema):
+    if isinstance(schema, list):
+        assert_atom_or_list_items_from(exp_pattern, artifact_key,
+                                       ["*"] + schema)
+        return
+
+    for sub_artifact_key, sub_schema in schema.iteritems():
+        assert_valid_artifact(exp_pattern[artifact_key], sub_artifact_key,
+                              sub_schema)
+
+
+def validate(spec_json, details):
+    """ Validates the json specification for generating tests. """
+
+    details['object'] = spec_json
+    assert_contains_only_fields(spec_json, [
+        "selection_pattern", "test_file_path_pattern",
+        "test_description_template", "test_page_title_template",
+        "specification", "delivery_key", "subresource_schema",
+        "source_context_schema", "source_context_list_schema",
+        "test_expansion_schema", "excluded_tests"
+    ])
+    assert_non_empty_list(spec_json, "specification")
+    assert_non_empty_dict(spec_json, "test_expansion_schema")
+    assert_non_empty_list(spec_json, "excluded_tests")
+
+    specification = spec_json['specification']
+    test_expansion_schema = spec_json['test_expansion_schema']
+    excluded_tests = spec_json['excluded_tests']
+
+    valid_test_expansion_fields = test_expansion_schema.keys()
+
+    # Should be consistent with `sourceContextMap` in
+    # `/common/security-features/resources/common.sub.js`.
+    valid_source_context_names = [
+        "top", "iframe", "iframe-blank", "srcdoc", "worker-classic",
+        "worker-module", "worker-classic-data", "worker-module-data",
+        "sharedworker-classic", "sharedworker-module",
+        "sharedworker-classic-data", "sharedworker-module-data"
+    ]
+
+    valid_subresource_names = [
+        "a-tag", "area-tag", "audio-tag", "form-tag", "iframe-tag", "img-tag",
+        "link-css-tag", "link-prefetch-tag", "object-tag", "picture-tag",
+        "script-tag", "script-tag-dynamic-import", "video-tag"
+    ] + ["beacon", "fetch", "xhr", "websocket"] + [
+        "worker-classic", "worker-module", "worker-import",
+        "worker-import-data", "sharedworker-classic", "sharedworker-module",
+        "sharedworker-import", "sharedworker-import-data",
+        "serviceworker-classic", "serviceworker-module",
+        "serviceworker-import", "serviceworker-import-data"
+    ] + [
+        "worklet-animation", "worklet-audio", "worklet-layout",
+        "worklet-paint", "worklet-animation-import", "worklet-audio-import",
+        "worklet-layout-import", "worklet-paint-import",
+        "worklet-animation-import-data", "worklet-audio-import-data",
+        "worklet-layout-import-data", "worklet-paint-import-data"
+    ]
+
+    # Validate each single spec.
+    for spec in specification:
+        details['object'] = spec
+
+        # Validate required fields for a single spec.
+        assert_contains_only_fields(spec, [
+            'title', 'description', 'specification_url', 'test_expansion'
+        ])
+        assert_non_empty_string(spec, 'title')
+        assert_non_empty_string(spec, 'description')
+        assert_non_empty_string(spec, 'specification_url')
+        assert_non_empty_list(spec, 'test_expansion')
+
+        for spec_exp in spec['test_expansion']:
+            details['object'] = spec_exp
+            assert_contains_only_fields(spec_exp, valid_test_expansion_fields)
+
+            for artifact in test_expansion_schema:
+                details['test_expansion_field'] = artifact
+                assert_valid_artifact(spec_exp, artifact,
+                                      test_expansion_schema[artifact])
+                del details['test_expansion_field']
+
+    # Validate source_context_schema.
+    details['object'] = spec_json['source_context_schema']
+    assert_contains_only_fields(
+        spec_json['source_context_schema'],
+        ['supported_delivery_type', 'supported_subresource'])
+    assert_contains_only_fields(
+        spec_json['source_context_schema']['supported_delivery_type'],
+        valid_source_context_names)
+    for source_context in spec_json['source_context_schema'][
+            'supported_delivery_type']:
+        assert_valid_artifact(
+            spec_json['source_context_schema']['supported_delivery_type'],
+            source_context, test_expansion_schema['delivery_type'])
+    assert_contains_only_fields(
+        spec_json['source_context_schema']['supported_subresource'],
+        valid_source_context_names)
+    for source_context in spec_json['source_context_schema'][
+            'supported_subresource']:
+        assert_valid_artifact(
+            spec_json['source_context_schema']['supported_subresource'],
+            source_context, leaf_values(test_expansion_schema['subresource']))
+
+    # Validate subresource_schema.
+    details['object'] = spec_json['subresource_schema']
+    assert_contains_only_fields(spec_json['subresource_schema'],
+                                ['supported_delivery_type'])
+    assert_contains_only_fields(
+        spec_json['subresource_schema']['supported_delivery_type'],
+        leaf_values(test_expansion_schema['subresource']))
+    for subresource in spec_json['subresource_schema'][
+            'supported_delivery_type']:
+        assert_valid_artifact(
+            spec_json['subresource_schema']['supported_delivery_type'],
+            subresource, test_expansion_schema['delivery_type'])
+
+    # Validate the test_expansion schema members.
+    details['object'] = test_expansion_schema
+    assert_contains_only_fields(test_expansion_schema, [
+        'expansion', 'source_scheme', 'source_context_list', 'delivery_type',
+        'delivery_value', 'redirection', 'subresource', 'origin', 'expectation'
+    ])
+    assert_atom_or_list_items_from(test_expansion_schema, 'expansion',
+                                   ['default', 'override'])
+    assert_atom_or_list_items_from(test_expansion_schema, 'source_scheme',
+                                   ['http', 'https'])
+    assert_atom_or_list_items_from(
+        test_expansion_schema, 'source_context_list',
+        spec_json['source_context_list_schema'].keys())
+
+    # Should be consistent with `preprocess_redirection` in
+    # `/common/security-features/subresource/subresource.py`.
+    assert_atom_or_list_items_from(test_expansion_schema, 'redirection', [
+        'no-redirect', 'keep-origin', 'swap-origin', 'keep-scheme',
+        'swap-scheme', 'downgrade'
+    ])
+    for subresource in leaf_values(test_expansion_schema['subresource']):
+        assert subresource in valid_subresource_names, "Invalid subresource %s" % subresource
+    # Should be consistent with getSubresourceOrigin() in
+    # `/common/security-features/resources/common.sub.js`.
+    assert_atom_or_list_items_from(test_expansion_schema, 'origin', [
+        'same-http', 'same-https', 'same-ws', 'same-wss', 'cross-http',
+        'cross-https', 'cross-ws', 'cross-wss', 'same-http-downgrade',
+        'cross-http-downgrade', 'same-ws-downgrade', 'cross-ws-downgrade'
+    ])
+
+    # Validate excluded tests.
+    details['object'] = excluded_tests
+    for excluded_test_expansion in excluded_tests:
+        assert_contains_only_fields(excluded_test_expansion,
+                                    valid_test_expansion_fields)
+        details['object'] = excluded_test_expansion
+        for artifact in test_expansion_schema:
+            details['test_expansion_field'] = artifact
+            assert_valid_artifact(excluded_test_expansion, artifact,
+                                  test_expansion_schema[artifact])
+            del details['test_expansion_field']
+
+    del details['object']
+
+
+def assert_valid_spec_json(spec_json):
+    error_details = {}
+    try:
+        validate(spec_json, error_details)
+    except AssertionError as err:
+        print('ERROR:', err.message)
+        print(json.dumps(error_details, indent=4))
+        sys.exit(1)
+
+
+def main():
+    spec_json = load_spec_json()
+    assert_valid_spec_json(spec_json)
+    print("Spec JSON is valid.")
+
+
+if __name__ == '__main__':
+    main()
diff --git a/test/wpt/tests/common/security-features/tools/template/disclaimer.template b/test/wpt/tests/common/security-features/tools/template/disclaimer.template
new file mode 100644
index 00000000000..ba9458cb312
--- /dev/null
+++ b/test/wpt/tests/common/security-features/tools/template/disclaimer.template
@@ -0,0 +1 @@
+<!-- DO NOT EDIT! Generated by `%(generating_script_filename)s --spec %(spec_directory)s/` -->
diff --git a/test/wpt/tests/common/security-features/tools/template/spec_json.js.template b/test/wpt/tests/common/security-features/tools/template/spec_json.js.template
new file mode 100644
index 00000000000..e4cbd034259
--- /dev/null
+++ b/test/wpt/tests/common/security-features/tools/template/spec_json.js.template
@@ -0,0 +1 @@
+var SPEC_JSON = %(spec_json)s;
diff --git a/test/wpt/tests/common/security-features/tools/template/test.debug.html.template b/test/wpt/tests/common/security-features/tools/template/test.debug.html.template
new file mode 100644
index 00000000000..b6be088f611
--- /dev/null
+++ b/test/wpt/tests/common/security-features/tools/template/test.debug.html.template
@@ -0,0 +1,26 @@
+<!DOCTYPE html>
+%(generated_disclaimer)s
+<html>
+  <head>
+    <meta charset="utf-8">
+    <meta name="timeout" content="long">%(meta_delivery_method)s
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <script src="/common/security-features/resources/common.sub.js"></script>
+    <!-- The original specification JSON for validating the scenario. -->
+    <script src="%(spec_json_js)s"></script>
+    <!-- Internal checking of the tests -->
+    <script src="%(sanity_checker_js)s"></script>
+%(helper_js)s  </head>
+  <body>
+    <script>
+      TestCase(
+        [
+          %(scenarios)s
+        ],
+        new SanityChecker()
+      ).start();
+    </script>
+    <div id="log"></div>
+  </body>
+</html>
diff --git a/test/wpt/tests/common/security-features/tools/template/test.release.html.template b/test/wpt/tests/common/security-features/tools/template/test.release.html.template
new file mode 100644
index 00000000000..bac2d5b5a4d
--- /dev/null
+++ b/test/wpt/tests/common/security-features/tools/template/test.release.html.template
@@ -0,0 +1,22 @@
+<!DOCTYPE html>
+%(generated_disclaimer)s
+<html>
+  <head>
+    <meta charset="utf-8">
+    <meta name="timeout" content="long">%(meta_delivery_method)s
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <script src="/common/security-features/resources/common.sub.js"></script>
+%(helper_js)s  </head>
+  <body>
+    <script>
+      TestCase(
+        [
+          %(scenarios)s
+        ],
+        new SanityChecker()
+      ).start();
+    </script>
+    <div id="log"></div>
+  </body>
+</html>
diff --git a/test/wpt/tests/common/security-features/tools/util.py b/test/wpt/tests/common/security-features/tools/util.py
new file mode 100644
index 00000000000..72541c78142
--- /dev/null
+++ b/test/wpt/tests/common/security-features/tools/util.py
@@ -0,0 +1,230 @@
+from __future__ import print_function
+
+import os, sys, json, json5, re
+import collections
+
+script_directory = os.path.dirname(os.path.abspath(__file__))
+template_directory = os.path.abspath(
+    os.path.join(script_directory, 'template'))
+test_root_directory = os.path.abspath(
+    os.path.join(script_directory, '..', '..', '..'))
+
+
+def get_template(basename):
+    with open(os.path.join(template_directory, basename), "r") as f:
+        return f.read()
+
+
+def write_file(filename, contents):
+    with open(filename, "w") as f:
+        f.write(contents)
+
+
+def read_nth_line(fp, line_number):
+    fp.seek(0)
+    for i, line in enumerate(fp):
+        if (i + 1) == line_number:
+            return line
+
+
+def load_spec_json(path_to_spec):
+    re_error_location = re.compile('line ([0-9]+) column ([0-9]+)')
+    with open(path_to_spec, "r") as f:
+        try:
+            return json5.load(f, object_pairs_hook=collections.OrderedDict)
+        except ValueError as ex:
+            print(ex.message)
+            match = re_error_location.search(ex.message)
+            if match:
+                line_number, column = int(match.group(1)), int(match.group(2))
+                print(read_nth_line(f, line_number).rstrip())
+                print(" " * (column - 1) + "^")
+            sys.exit(1)
+
+
+class ShouldSkip(Exception):
+    '''
+    Raised when the given combination of subresource type, source context type,
+    delivery type etc. are not supported and we should skip that configuration.
+    ShouldSkip is expected in normal generator execution (and thus subsequent
+    generation continues), as we first enumerate a broad range of configurations
+    first, and later raise ShouldSkip to filter out unsupported combinations.
+
+    ShouldSkip is distinguished from other general errors that cause immediate
+    termination of the generator and require fix.
+    '''
+    def __init__(self):
+        pass
+
+
+class PolicyDelivery(object):
+    '''
+    See `@typedef PolicyDelivery` comments in
+    `common/security-features/resources/common.sub.js`.
+    '''
+
+    def __init__(self, delivery_type, key, value):
+        self.delivery_type = delivery_type
+        self.key = key
+        self.value = value
+
+    def __eq__(self, other):
+        return type(self) is type(other) and self.__dict__ == other.__dict__
+
+    @classmethod
+    def list_from_json(cls, list, target_policy_delivery,
+                       supported_delivery_types):
+        # type: (dict, PolicyDelivery, typing.List[str]) -> typing.List[PolicyDelivery]
+        '''
+        Parses a JSON object `list` that represents a list of `PolicyDelivery`
+        and returns a list of `PolicyDelivery`, plus supporting placeholders
+        (see `from_json()` comments below or
+        `common/security-features/README.md`).
+
+        Can raise `ShouldSkip`.
+        '''
+        if list is None:
+            return []
+
+        out = []
+        for obj in list:
+            policy_delivery = PolicyDelivery.from_json(
+                obj, target_policy_delivery, supported_delivery_types)
+            # Drop entries with null values.
+            if policy_delivery.value is None:
+                continue
+            out.append(policy_delivery)
+        return out
+
+    @classmethod
+    def from_json(cls, obj, target_policy_delivery, supported_delivery_types):
+        # type: (dict, PolicyDelivery, typing.List[str]) -> PolicyDelivery
+        '''
+           Parses a JSON object `obj` and returns a `PolicyDelivery` object.
+           In addition to dicts (in the same format as to_json() outputs),
+           this method accepts the following placeholders:
+             "policy":
+               `target_policy_delivery`
+             "policyIfNonNull":
+               `target_policy_delivery` if its value is not None.
+             "anotherPolicy":
+               A PolicyDelivery that has the same key as
+               `target_policy_delivery` but a different value.
+               The delivery type is selected from `supported_delivery_types`.
+
+        Can raise `ShouldSkip`.
+        '''
+
+        if obj == "policy":
+            policy_delivery = target_policy_delivery
+        elif obj == "nonNullPolicy":
+            if target_policy_delivery.value is None:
+                raise ShouldSkip()
+            policy_delivery = target_policy_delivery
+        elif obj == "anotherPolicy":
+            if len(supported_delivery_types) == 0:
+                raise ShouldSkip()
+            policy_delivery = target_policy_delivery.get_another_policy(
+                supported_delivery_types[0])
+        elif isinstance(obj, dict):
+            policy_delivery = PolicyDelivery(obj['deliveryType'], obj['key'],
+                                             obj['value'])
+        else:
+            raise Exception('policy delivery is invalid: ' + obj)
+
+        # Omit unsupported combinations of source contexts and delivery type.
+        if policy_delivery.delivery_type not in supported_delivery_types:
+            raise ShouldSkip()
+
+        return policy_delivery
+
+    def to_json(self):
+        # type: () -> dict
+        return {
+            "deliveryType": self.delivery_type,
+            "key": self.key,
+            "value": self.value
+        }
+
+    def get_another_policy(self, delivery_type):
+        # type: (str) -> PolicyDelivery
+        if self.key == 'referrerPolicy':
+            # Return 'unsafe-url' (i.e. more unsafe policy than `self.value`)
+            # as long as possible, to make sure the tests to fail if the
+            # returned policy is used unexpectedly instead of `self.value`.
+            # Using safer policy wouldn't be distinguishable from acceptable
+            # arbitrary policy enforcement by user agents, as specified at
+            # Step 7 of
+            # https://w3c.github.io/webappsec-referrer-policy/#determine-requests-referrer:
+            # "The user agent MAY alter referrerURL or referrerOrigin at this
+            # point to enforce arbitrary policy considerations in the
+            # interests of minimizing data leakage."
+            # See also the comments at `referrerUrlResolver` in
+            # `wpt/referrer-policy/generic/test-case.sub.js`.
+            if self.value != 'unsafe-url':
+                return PolicyDelivery(delivery_type, self.key, 'unsafe-url')
+            else:
+                return PolicyDelivery(delivery_type, self.key, 'no-referrer')
+        elif self.key == 'mixedContent':
+            if self.value == 'opt-in':
+                return PolicyDelivery(delivery_type, self.key, None)
+            else:
+                return PolicyDelivery(delivery_type, self.key, 'opt-in')
+        elif self.key == 'contentSecurityPolicy':
+            if self.value is not None:
+                return PolicyDelivery(delivery_type, self.key, None)
+            else:
+                return PolicyDelivery(delivery_type, self.key, 'worker-src-none')
+        elif self.key == 'upgradeInsecureRequests':
+            if self.value == 'upgrade':
+                return PolicyDelivery(delivery_type, self.key, None)
+            else:
+                return PolicyDelivery(delivery_type, self.key, 'upgrade')
+        else:
+            raise Exception('delivery key is invalid: ' + self.key)
+
+
+class SourceContext(object):
+    def __init__(self, source_context_type, policy_deliveries):
+        # type: (unicode, typing.List[PolicyDelivery]) -> None
+        self.source_context_type = source_context_type
+        self.policy_deliveries = policy_deliveries
+
+    def __eq__(self, other):
+        return type(self) is type(other) and self.__dict__ == other.__dict__
+
+    @classmethod
+    def from_json(cls, obj, target_policy_delivery, source_context_schema):
+        '''
+        Parses a JSON object `obj` and returns a `SourceContext` object.
+
+        `target_policy_delivery` and `source_context_schema` are used for
+        policy delivery placeholders and filtering out unsupported
+        delivery types.
+
+        Can raise `ShouldSkip`.
+        '''
+        source_context_type = obj.get('sourceContextType')
+        policy_deliveries = PolicyDelivery.list_from_json(
+            obj.get('policyDeliveries'), target_policy_delivery,
+            source_context_schema['supported_delivery_type']
+            [source_context_type])
+        return SourceContext(source_context_type, policy_deliveries)
+
+    def to_json(self):
+        return {
+            "sourceContextType": self.source_context_type,
+            "policyDeliveries": [x.to_json() for x in self.policy_deliveries]
+        }
+
+
+class CustomEncoder(json.JSONEncoder):
+    '''
+    Used to dump dicts containing `SourceContext`/`PolicyDelivery` into JSON.
+    '''
+    def default(self, obj):
+        if isinstance(obj, SourceContext):
+            return obj.to_json()
+        if isinstance(obj, PolicyDelivery):
+            return obj.to_json()
+        return json.JSONEncoder.default(self, obj)
diff --git a/test/wpt/tests/common/security-features/types.md b/test/wpt/tests/common/security-features/types.md
new file mode 100644
index 00000000000..17079916c1e
--- /dev/null
+++ b/test/wpt/tests/common/security-features/types.md
@@ -0,0 +1,62 @@
+# Types around the generator and generated tests
+
+This document describes types and concepts used across JavaScript and Python parts of this test framework.
+Please refer to the JSDoc in `common.sub.js` or docstrings in Python scripts (if any).
+
+## Scenario
+
+### Properties
+
+- All keys of `test_expansion_schema` in `spec.src.json`, except for `expansion`, `delivery_type`, `delivery_value`, and `source_context_list`. Their values are **string**s specified in `test_expansion_schema`.
+- `source_context_list`
+- `subresource_policy_deliveries`
+
+### Types
+
+- Generator (`spec.src.json`): JSON object
+- Generator (Python): `dict`
+- Runtime (JS): JSON object
+- Runtime (Python): N/A
+
+## `PolicyDelivery`
+
+### Types
+
+- Generator (`spec.src.json`): JSON object
+- Generator (Python): `util.PolicyDelivery`
+- Runtime (JS): JSON object (`@typedef PolicyDelivery` in `common.sub.js`)
+- Runtime (Python): N/A
+
+## `SourceContext`
+
+Subresource requests can be possibly sent from various kinds of fetch client's environment settings objects. For example:
+
+- top-level windows,
+- `<iframe>`s, or
+- `WorkerGlobalScope`s.
+
+A **`SourceContext`** object specifies one environment settings object, and an Array of `SourceContext` specifies a possibly nested context, from the outer-most to inner-most environment settings objects.
+
+Note: The top-level document is processed and trimmed by the generator, and is not included in the `sourceContextList` field of `Scenario` in the generated output.
+
+For example, `[{sourceContextType: "srcdoc"}, {sourceContextType: "worker-classic"}]` means that a subresource request is to be sent from a classic dedicated worker created from `<iframe srcdoc>` inside the top-level HTML Document.
+
+Note: A `SourceContext` (or an array of `SourceContext`) is set based on the fetch client's settings object that is used for the subresource fetch, NOT on the module map settings object nor on the inner-most settings object that appears in the test.
+For example, the `sourceContextList` field of `Scenario` is `[]` (indicating the top-level Window):
+
+- When testing top-level worker script fetch, e.g. `new Worker('worker.js')`. There is `WorkerGlobalScope` created from `worker.js`, but it isn't the fetch client's settings object used for fetching `worker.js` itself.
+- When testing worker script imported from the root worker script, e.g. `new Worker('top.js', {type: 'module'})` where `top.js` has `import 'worker.js'`. Again, the fetch client's settings object used for `worker.js` is the top-level Window, not `WorkerGlobalScope` created by `top.js`.
+
+### Properties
+
+- `sourceContextType`:  A string specifying the kind of the source context to be used.
+   Valid values are the keys of `sourceContextMap` in `common.sub.js`, or `"top"` indicating the top-level Document (`"top"` is valid/used only in the generator).
+
+- `policyDeliveries`: A list of `PolicyDelivery` applied to the source context.
+
+### Types
+
+- Generator (`spec.src.json`): JSON object
+- Generator (Python): `util.SourceContext`
+- Runtime (JS): JSON object (`@typedef SourceContext` in `common.sub.js`)
+- Runtime (Python): N/A
diff --git a/test/wpt/tests/common/slow-redirect.py b/test/wpt/tests/common/slow-redirect.py
new file mode 100644
index 00000000000..85c80e08446
--- /dev/null
+++ b/test/wpt/tests/common/slow-redirect.py
@@ -0,0 +1,29 @@
+import time
+
+def main(request, response):
+    """Simple handler that causes redirection.
+
+    The request should typically have two query parameters:
+    status - The status to use for the redirection. Defaults to 302.
+    location - The resource to redirect to.
+    """
+    status = 302
+    delay = 2
+    if b"status" in request.GET:
+        try:
+            status = int(request.GET.first(b"status"))
+        except ValueError:
+            pass
+
+    if b"delay" in request.GET:
+        try:
+            delay = int(request.GET.first(b"delay"))
+        except ValueError:
+            pass
+
+    response.status = status
+    time.sleep(delay)
+
+    location = request.GET.first(b"location")
+
+    response.headers.set(b"Location", location)
diff --git a/test/wpt/tests/common/slow.py b/test/wpt/tests/common/slow.py
new file mode 100644
index 00000000000..9be8aadf353
--- /dev/null
+++ b/test/wpt/tests/common/slow.py
@@ -0,0 +1,6 @@
+import time
+
+def main(request, response):
+    delay = float(request.GET.first(b"delay", 2000)) / 1000
+    time.sleep(delay)
+    return 200, [], b''
diff --git a/test/wpt/tests/common/square.png b/test/wpt/tests/common/square.png
new file mode 100644
index 00000000000..01c9666a8de
Binary files /dev/null and b/test/wpt/tests/common/square.png differ
diff --git a/test/wpt/tests/common/stringifiers.js b/test/wpt/tests/common/stringifiers.js
new file mode 100644
index 00000000000..8dadac1d492
--- /dev/null
+++ b/test/wpt/tests/common/stringifiers.js
@@ -0,0 +1,57 @@
+/**
+ * Runs tests for <https://webidl.spec.whatwg.org/#es-stringifier>.
+ * @param {Object} aObject - object to test
+ * @param {string} aAttribute - IDL attribute name that is annotated with `stringifier`
+ * @param {boolean} aIsUnforgeable - whether the IDL attribute is `[LegacyUnforgeable]`
+ */
+function test_stringifier_attribute(aObject, aAttribute, aIsUnforgeable) {
+  // Step 1.
+  test(function() {
+    [null, undefined].forEach(function(v) {
+      assert_throws_js(TypeError, function() {
+        aObject.toString.call(v);
+      });
+    });
+  });
+
+  // TODO Step 2: security check.
+
+  // Step 3.
+  test(function() {
+    assert_false("Window" in window && aObject instanceof window.Window);
+    [{}, window].forEach(function(v) {
+      assert_throws_js(TypeError, function() {
+        aObject.toString.call(v)
+      });
+    });
+  });
+
+  // Step 4-6.
+  var expected_value;
+  test(function() {
+    expected_value = aObject[aAttribute];
+    assert_equals(aObject[aAttribute], expected_value,
+                  "The attribute " + aAttribute + " should be pure.");
+  });
+
+  var test_error = { name: "test" };
+  test(function() {
+    if (!aIsUnforgeable) {
+      Object.defineProperty(aObject, aAttribute, {
+        configurable: true,
+        get: function() { throw test_error; }
+      });
+    }
+    assert_equals(aObject.toString(), expected_value);
+  });
+
+  test(function() {
+    if (!aIsUnforgeable) {
+      Object.defineProperty(aObject, aAttribute, {
+        configurable: true,
+        value: { toString: function() { throw test_error; } }
+      });
+    }
+    assert_equals(aObject.toString(), expected_value);
+  });
+}
diff --git a/test/wpt/tests/common/stringifiers.js.headers b/test/wpt/tests/common/stringifiers.js.headers
new file mode 100644
index 00000000000..6805c323df5
--- /dev/null
+++ b/test/wpt/tests/common/stringifiers.js.headers
@@ -0,0 +1 @@
+Content-Type: text/javascript; charset=utf-8
diff --git a/test/wpt/tests/common/subset-tests-by-key.js b/test/wpt/tests/common/subset-tests-by-key.js
new file mode 100644
index 00000000000..483017a6448
--- /dev/null
+++ b/test/wpt/tests/common/subset-tests-by-key.js
@@ -0,0 +1,83 @@
+(function() {
+  var subTestKeyPattern = null;
+  var match;
+  var collectKeys = false;
+  var collectCounts = false;
+  var keys = {};
+  var exclude = false;
+  if (location.search) {
+    match = /(?:^\?|&)(include|exclude)=([^&]+)?/.exec(location.search);
+    if (match) {
+      subTestKeyPattern = new RegExp(`^${match[2]}$`);
+      if (match[1] === 'exclude') {
+        exclude = true;
+      }
+    }
+    // Below is utility code to generate <meta> for copy/paste into tests.
+    // Sample usage:
+    // test.html?get-keys
+    match = /(?:^\?|&)get-keys(&get-counts)?(?:&|$)/.exec(location.search);
+    if (match) {
+      collectKeys = true;
+      if (match[1]) {
+        collectCounts = true;
+      }
+      add_completion_callback(() => {
+        var metas = [];
+        var template = '<meta name="variant" content="?include=%s">';
+        if (collectCounts) {
+          template += ' <!--%s-->';
+        }
+        for (var key in keys) {
+          var meta = template.replace("%s", key);
+          if (collectCounts) {
+            meta = meta.replace("%s", keys[key]);
+          }
+          metas.push(meta);
+        }
+        var pre = document.createElement('pre');
+        pre.textContent = metas.join('\n') + '\n';
+        document.body.insertBefore(pre, document.body.firstChild);
+        document.getSelection().selectAllChildren(pre);
+      });
+    }
+  }
+  /**
+   * Check if `key` is in the subset specified in the URL.
+   * @param {string} key
+   * @returns {boolean}
+   */
+  function shouldRunSubTest(key) {
+    if (key && subTestKeyPattern) {
+      var found = subTestKeyPattern.test(key);
+      if (exclude) {
+        return !found;
+      }
+      return found;
+    }
+    return true;
+  }
+  /**
+   * Only test a subset of tests with `?include=Foo` or `?exclude=Foo` in the URL.
+   * Can be used together with `<meta name="variant" content="...">`
+   * Sample usage:
+   * for (const test of tests) {
+   *   subsetTestByKey("Foo", async_test, test.fn, test.name);
+   * }
+   */
+   function subsetTestByKey(key, testFunc, ...args) {
+    if (collectKeys) {
+      if (collectCounts && key in keys) {
+        keys[key]++;
+      } else {
+        keys[key] = 1;
+      }
+    }
+    if (shouldRunSubTest(key)) {
+      return testFunc(...args);
+    }
+    return null;
+  }
+  self.shouldRunSubTest = shouldRunSubTest;
+  self.subsetTestByKey = subsetTestByKey;
+})();
diff --git a/test/wpt/tests/common/subset-tests.js b/test/wpt/tests/common/subset-tests.js
new file mode 100644
index 00000000000..58e93413de4
--- /dev/null
+++ b/test/wpt/tests/common/subset-tests.js
@@ -0,0 +1,60 @@
+(function() {
+  var subTestStart = 0;
+  var subTestEnd = Infinity;
+  var match;
+  if (location.search) {
+    match = /(?:^\?|&)(\d+)-(\d+|last)(?:&|$)/.exec(location.search);
+    if (match) {
+      subTestStart = parseInt(match[1], 10);
+      if (match[2] !== "last") {
+          subTestEnd = parseInt(match[2], 10);
+      }
+    }
+    // Below is utility code to generate <meta> for copy/paste into tests.
+    // Sample usage:
+    // test.html?split=1000
+    match = /(?:^\?|&)split=(\d+)(?:&|$)/.exec(location.search);
+    if (match) {
+      var testsPerVariant = parseInt(match[1], 10);
+      add_completion_callback(tests => {
+        var total = tests.length;
+        var template = '<meta name="variant" content="?%s-%s">';
+        var metas = [];
+        for (var i = 1; i < total - testsPerVariant; i = i + testsPerVariant) {
+          metas.push(template.replace("%s", i).replace("%s", i + testsPerVariant - 1));
+        }
+        metas.push(template.replace("%s", i).replace("%s", "last"));
+        var pre = document.createElement('pre');
+        pre.textContent = metas.join('\n');
+        document.body.insertBefore(pre, document.body.firstChild);
+        document.getSelection().selectAllChildren(pre);
+      });
+    }
+  }
+  /**
+   * Check if `currentSubTest` is in the subset specified in the URL.
+   * @param {number} currentSubTest
+   * @returns {boolean}
+   */
+  function shouldRunSubTest(currentSubTest) {
+    return currentSubTest >= subTestStart && currentSubTest <= subTestEnd;
+  }
+  var currentSubTest = 0;
+  /**
+   * Only test a subset of tests with, e.g., `?1-10` in the URL.
+   * Can be used together with `<meta name="variant" content="...">`
+   * Sample usage:
+   * for (const test of tests) {
+   *   subsetTest(async_test, test.fn, test.name);
+   * }
+   */
+  function subsetTest(testFunc, ...args) {
+    currentSubTest++;
+    if (shouldRunSubTest(currentSubTest)) {
+      return testFunc(...args);
+    }
+    return null;
+  }
+  self.shouldRunSubTest = shouldRunSubTest;
+  self.subsetTest = subsetTest;
+})();
diff --git a/test/wpt/tests/common/test-setting-immutable-prototype.js b/test/wpt/tests/common/test-setting-immutable-prototype.js
new file mode 100644
index 00000000000..de9bdd5919a
--- /dev/null
+++ b/test/wpt/tests/common/test-setting-immutable-prototype.js
@@ -0,0 +1,67 @@
+self.testSettingImmutablePrototypeToNewValueOnly =
+  (prefix, target, newValue, newValueString, { isSameOriginDomain },
+   targetGlobal = window) => {
+  test(() => {
+    assert_throws_js(TypeError, () => {
+      Object.setPrototypeOf(target, newValue);
+    });
+  }, `${prefix}: setting the prototype to ${newValueString} via Object.setPrototypeOf should throw a TypeError`);
+
+  let dunderProtoError = "SecurityError";
+  let dunderProtoErrorName = "\"SecurityError\" DOMException";
+  if (isSameOriginDomain) {
+    // We're going to end up calling the __proto__ setter, which will
+    // enter the Realm of targetGlobal before throwing.
+    dunderProtoError = targetGlobal.TypeError;
+    dunderProtoErrorName = "TypeError";
+  }
+
+  test(() => {
+    const func = function() {
+      target.__proto__ = newValue;
+    };
+    if (isSameOriginDomain) {
+      assert_throws_js(dunderProtoError, func);
+    } else {
+      assert_throws_dom(dunderProtoError, func);
+    }
+  }, `${prefix}: setting the prototype to ${newValueString} via __proto__ should throw a ${dunderProtoErrorName}`);
+
+  test(() => {
+    assert_false(Reflect.setPrototypeOf(target, newValue));
+  }, `${prefix}: setting the prototype to ${newValueString} via Reflect.setPrototypeOf should return false`);
+};
+
+self.testSettingImmutablePrototype =
+  (prefix, target, originalValue, { isSameOriginDomain }, targetGlobal = window) => {
+  const newValue = {};
+  const newValueString = "an empty object";
+  testSettingImmutablePrototypeToNewValueOnly(prefix, target, newValue, newValueString, { isSameOriginDomain }, targetGlobal);
+
+  const originalValueString = originalValue === null ? "null" : "its original value";
+
+  test(() => {
+    assert_equals(Object.getPrototypeOf(target), originalValue);
+  }, `${prefix}: the prototype must still be ${originalValueString}`);
+
+  test(() => {
+    Object.setPrototypeOf(target, originalValue);
+  }, `${prefix}: setting the prototype to ${originalValueString} via Object.setPrototypeOf should not throw`);
+
+  if (isSameOriginDomain) {
+    test(() => {
+      target.__proto__ = originalValue;
+    }, `${prefix}: setting the prototype to ${originalValueString} via __proto__ should not throw`);
+  } else {
+    test(() => {
+      assert_throws_dom("SecurityError", function() {
+        target.__proto__ = newValue;
+      });
+    }, `${prefix}: setting the prototype to ${originalValueString} via __proto__ should throw a "SecurityError" since ` +
+       `it ends up in CrossOriginGetOwnProperty`);
+  }
+
+  test(() => {
+    assert_true(Reflect.setPrototypeOf(target, originalValue));
+  }, `${prefix}: setting the prototype to ${originalValueString} via Reflect.setPrototypeOf should return true`);
+};
diff --git a/test/wpt/tests/common/test-setting-immutable-prototype.js.headers b/test/wpt/tests/common/test-setting-immutable-prototype.js.headers
new file mode 100644
index 00000000000..6805c323df5
--- /dev/null
+++ b/test/wpt/tests/common/test-setting-immutable-prototype.js.headers
@@ -0,0 +1 @@
+Content-Type: text/javascript; charset=utf-8
diff --git a/test/wpt/tests/common/text-plain.txt b/test/wpt/tests/common/text-plain.txt
new file mode 100644
index 00000000000..97ca870b6d5
--- /dev/null
+++ b/test/wpt/tests/common/text-plain.txt
@@ -0,0 +1,4 @@
+This is a sample text/plain document.
+
+This is not an HTML document.
+
diff --git a/test/wpt/tests/common/third_party/reftest-analyzer.xhtml b/test/wpt/tests/common/third_party/reftest-analyzer.xhtml
new file mode 100644
index 00000000000..4c7b26511ac
--- /dev/null
+++ b/test/wpt/tests/common/third_party/reftest-analyzer.xhtml
@@ -0,0 +1,934 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!-- -*- Mode: HTML; tab-width: 2; indent-tabs-mode: nil; -*- -->
+<!-- vim: set shiftwidth=2 tabstop=2 autoindent expandtab: -->
+<!-- This Source Code Form is subject to the terms of the Mozilla Public
+   - License, v. 2.0. If a copy of the MPL was not distributed with this
+   - file, You can obtain one at http://mozilla.org/MPL/2.0/. -->
+<!--
+
+Features to add:
+* make the left and right parts of the viewer independently scrollable
+* make the test list filterable
+** default to only showing unexpecteds
+* add other ways to highlight differences other than circling?
+* add zoom/pan to images
+* Add ability to load log via XMLHttpRequest (also triggered via URL param)
+* color the test list based on pass/fail and expected/unexpected/random/skip
+* ability to load multiple logs ?
+** rename them by clicking on the name and editing
+** turn the test list into a collapsing tree view
+** move log loading into popup from viewer UI
+
+-->
+<!DOCTYPE html>
+<html lang="en-US" xml:lang="en-US" xmlns="http://www.w3.org/1999/xhtml">
+<head>
+  <title>Reftest analyzer</title>
+  <style type="text/css"><![CDATA[
+
+  html, body { margin: 0; }
+  html { padding: 0; }
+  body { padding: 4px; }
+
+  #pixelarea, #itemlist, #images { position: absolute; }
+  #itemlist, #images { overflow: auto; }
+  #pixelarea { top: 0; left: 0; width: 320px; height: 84px; overflow: visible }
+  #itemlist { top: 84px; left: 0; width: 320px; bottom: 0; }
+  #images { top: 0; bottom: 0; left: 320px; right: 0; }
+
+  #leftpane { width: 320px; }
+  #images { position: fixed; top: 10px; left: 340px; }
+
+  form#imgcontrols { margin: 0; display: block; }
+
+  #itemlist > table { border-collapse: collapse; }
+  #itemlist > table > tbody > tr > td { border: 1px solid; padding: 1px; }
+  #itemlist td.activeitem { background-color: yellow; }
+
+  /*
+  #itemlist > table > tbody > tr.pass > td.url { background: lime; }
+  #itemlist > table > tbody > tr.fail > td.url { background: red; }
+  */
+
+  #magnification > svg { display: block; width: 84px; height: 84px; }
+
+  #pixelinfo { font: small sans-serif; position: absolute; width: 200px; left: 84px; }
+  #pixelinfo table { border-collapse: collapse; }
+  #pixelinfo table th { white-space: nowrap; text-align: left; padding: 0; }
+  #pixelinfo table td { font-family: monospace; padding: 0 0 0 0.25em; }
+
+  #pixelhint { display: inline; color: #88f; cursor: help; }
+  #pixelhint > * { display: none; position: absolute; margin: 8px 0 0 8px; padding: 4px; width: 400px; background: #ffa; color: black; box-shadow: 3px 3px 2px #888; z-index: 1; }
+  #pixelhint:hover { color: #000; }
+  #pixelhint:hover > * { display: block; }
+  #pixelhint p { margin: 0; }
+  #pixelhint p + p { margin-top: 1em; }
+
+  ]]></style>
+  <script type="text/javascript"><![CDATA[
+
+var XLINK_NS = "http://www.w3.org/1999/xlink";
+var SVG_NS = "http://www.w3.org/2000/svg";
+var IMAGE_NOT_AVAILABLE = "data:image/png;base64,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";
+
+var gPhases = null;
+
+var gIDCache = {};
+
+var gMagPixPaths = [];     // 2D array of array-of-two <path> objects used in the pixel magnifier
+var gMagWidth = 5;         // number of zoomed in pixels to show horizontally
+var gMagHeight = 5;        // number of zoomed in pixels to show vertically
+var gMagZoom = 16;         // size of the zoomed in pixels
+var gImage1Data;           // ImageData object for the reference image
+var gImage2Data;           // ImageData object for the test output image
+var gFlashingPixels = [];  // array of <path> objects that should be flashed due to pixel color mismatch
+var gParams;
+
+function ID(id) {
+  if (!(id in gIDCache))
+    gIDCache[id] = document.getElementById(id);
+  return gIDCache[id];
+}
+
+function hash_parameters() {
+  var result = { };
+  var params = window.location.hash.substr(1).split(/[&;]/);
+  for (var i = 0; i < params.length; i++) {
+    var parts = params[i].split("=");
+    result[parts[0]] = unescape(unescape(parts[1]));
+  }
+  return result;
+}
+
+function load() {
+  gPhases = [ ID("entry"), ID("loading"), ID("viewer") ];
+  build_mag();
+  gParams = hash_parameters();
+  if (gParams.log) {
+    show_phase("loading");
+    process_log(gParams.log);
+  } else if (gParams.logurl) {
+    show_phase("loading");
+    var req = new XMLHttpRequest();
+    req.onreadystatechange = function() {
+      if (req.readyState === 4) {
+        process_log(req.responseText);
+      }
+    };
+    req.open('GET', gParams.logurl, true);
+    req.send();
+  }
+  window.addEventListener('keypress', handle_keyboard_shortcut);
+  window.addEventListener('keydown',  handle_keydown);
+  ID("image1").addEventListener('error', image_load_error);
+  ID("image2").addEventListener('error', image_load_error);
+}
+
+function image_load_error(e) {
+  e.target.setAttributeNS(XLINK_NS, "xlink:href", IMAGE_NOT_AVAILABLE);
+}
+
+function build_mag() {
+  var mag = ID("mag");
+
+  var r = document.createElementNS(SVG_NS, "rect");
+  r.setAttribute("x", gMagZoom * -gMagWidth / 2);
+  r.setAttribute("y", gMagZoom * -gMagHeight / 2);
+  r.setAttribute("width", gMagZoom * gMagWidth);
+  r.setAttribute("height", gMagZoom * gMagHeight);
+  mag.appendChild(r);
+
+  mag.setAttribute("transform", "translate(" + (gMagZoom * (gMagWidth / 2) + 1) + "," + (gMagZoom * (gMagHeight / 2) + 1) + ")");
+
+  for (var x = 0; x < gMagWidth; x++) {
+    gMagPixPaths[x] = [];
+    for (var y = 0; y < gMagHeight; y++) {
+      var p1 = document.createElementNS(SVG_NS, "path");
+      p1.setAttribute("d", "M" + ((x - gMagWidth / 2) + 1) * gMagZoom + "," + (y - gMagHeight / 2) * gMagZoom + "h" + -gMagZoom + "v" + gMagZoom);
+      p1.setAttribute("stroke", "black");
+      p1.setAttribute("stroke-width", "1px");
+      p1.setAttribute("fill", "#aaa");
+
+      var p2 = document.createElementNS(SVG_NS, "path");
+      p2.setAttribute("d", "M" + ((x - gMagWidth / 2) + 1) * gMagZoom + "," + (y - gMagHeight / 2) * gMagZoom + "v" + gMagZoom + "h" + -gMagZoom);
+      p2.setAttribute("stroke", "black");
+      p2.setAttribute("stroke-width", "1px");
+      p2.setAttribute("fill", "#888");
+
+      mag.appendChild(p1);
+      mag.appendChild(p2);
+      gMagPixPaths[x][y] = [p1, p2];
+    }
+  }
+
+  var flashedOn = false;
+  setInterval(function() {
+    flashedOn = !flashedOn;
+    flash_pixels(flashedOn);
+  }, 500);
+}
+
+function show_phase(phaseid) {
+  for (var i in gPhases) {
+    var phase = gPhases[i];
+    phase.style.display = (phase.id == phaseid) ? "" : "none";
+  }
+
+  if (phase == "viewer")
+    ID("images").style.display = "none";
+}
+
+function fileentry_changed() {
+  show_phase("loading");
+  var input = ID("fileentry");
+  var files = input.files;
+  if (files.length > 0) {
+    // Only handle the first file; don't handle multiple selection.
+    // The parts of the log we care about are ASCII-only.  Since we
+    // can ignore lines we don't care about, best to read in as
+    // iso-8859-1, which guarantees we don't get decoding errors.
+    var fileReader = new FileReader();
+    fileReader.onload = function(e) {
+      var log = null;
+
+      log = e.target.result;
+
+      if (log)
+        process_log(log);
+      else
+        show_phase("entry");
+    }
+    fileReader.readAsText(files[0], "iso-8859-1");
+  }
+  // So the user can process the same filename again (after
+  // overwriting the log), clear the value on the form input so we
+  // will always get an onchange event.
+  input.value = "";
+}
+
+function log_pasted() {
+  show_phase("loading");
+  var entry = ID("logentry");
+  var log = entry.value;
+  entry.value = "";
+  process_log(log);
+}
+
+var gTestItems;
+
+// This function is not used in production code, but can be invoked manually
+// from the devtools console in order to test changes to the parsing regexes
+// in process_log.
+function test_parsing() {
+  // Note that the logs in these testcases have been manually edited to strip
+  // out stuff for brevity.
+  var testcases = [
+    { "name": "empty log",
+      "log": "",
+      "expected": { "pass": 0, "unexpected": 0, "random": 0, "skip": 0 },
+      "expected_images": 0,
+    },
+    { "name": "android log",
+      "log": `[task 2018-12-28T10:36:45.718Z] 10:36:45     INFO -  REFTEST TEST-START | a == b
+[task 2018-12-28T10:36:45.719Z] 10:36:45     INFO -  REFTEST TEST-LOAD | a | 78 / 275 (28%)
+[task 2018-12-28T10:36:56.138Z] 10:36:56     INFO -  REFTEST TEST-LOAD | b | 78 / 275 (28%)
+[task 2018-12-28T10:37:06.559Z] 10:37:06     INFO -  REFTEST TEST-UNEXPECTED-FAIL | a == b | image comparison, max difference: 255, number of differing pixels: 5950
+[task 2018-12-28T10:37:06.568Z] 10:37:06     INFO -  REFTEST   IMAGE 1 (TEST): data:image/png;base64,
+[task 2018-12-28T10:37:06.577Z] 10:37:06     INFO -  REFTEST   IMAGE 2 (REFERENCE): data:image/png;base64,
+[task 2018-12-28T10:37:06.577Z] 10:37:06     INFO -  REFTEST INFO | Saved log: stuff trimmed here
+[task 2018-12-28T10:37:06.582Z] 10:37:06     INFO -  REFTEST TEST-END | a == b
+[task 2018-12-28T10:37:06.583Z] 10:37:06     INFO -  REFTEST TEST-START | a2 == b2
+[task 2018-12-28T10:37:06.583Z] 10:37:06     INFO -  REFTEST TEST-LOAD | a2 | 79 / 275 (28%)
+[task 2018-12-28T10:37:06.584Z] 10:37:06     INFO -  REFTEST TEST-LOAD | b2 | 79 / 275 (28%)
+[task 2018-12-28T10:37:16.982Z] 10:37:16     INFO -  REFTEST TEST-PASS | a2 == b2 | image comparison, max difference: 0, number of differing pixels: 0
+[task 2018-12-28T10:37:16.982Z] 10:37:16     INFO -  REFTEST TEST-END | a2 == b2`,
+      "expected": { "pass": 1, "unexpected": 1, "random": 0, "skip": 0 },
+      "expected_images": 2,
+    },
+    { "name": "local reftest run (Linux)",
+      "log": `REFTEST TEST-START | file:///a == file:///b
+REFTEST TEST-LOAD | file:///a | 73 / 86 (84%)
+REFTEST TEST-LOAD | file:///b | 73 / 86 (84%)
+REFTEST TEST-PASS | file:///a == file:///b | image comparison, max difference: 0, number of differing pixels: 0
+REFTEST TEST-END | file:///a == file:///b`,
+      "expected": { "pass": 1, "unexpected": 0, "random": 0, "skip": 0 },
+      "expected_images": 0,
+    },
+    { "name": "wpt reftests (Linux automation)",
+      "log": `16:50:43     INFO - TEST-START | /a
+16:50:43     INFO - PID 4276 | 1548694243694	Marionette	INFO	Testing http://web-platform.test:8000/a == http://web-platform.test:8000/b
+16:50:43     INFO - PID 4276 | 1548694243963	Marionette	INFO	No differences allowed
+16:50:44     INFO - TEST-PASS | /a | took 370ms
+16:50:44     INFO - TEST-START | /a2
+16:50:44     INFO - PID 4276 | 1548694244066	Marionette	INFO	Testing http://web-platform.test:8000/a2 == http://web-platform.test:8000/b2
+16:50:44     INFO - PID 4276 | 1548694244792	Marionette	INFO	No differences allowed
+16:50:44     INFO - PID 4276 | 1548694244792	Marionette	INFO	Found 28 pixels different, maximum difference per channel 14
+16:50:44     INFO - TEST-UNEXPECTED-FAIL | /a2 | Testing http://web-platform.test:8000/a2 == http://web-platform.test:8000/b2
+16:50:44     INFO - REFTEST   IMAGE 1 (TEST): data:image/png;base64,
+16:50:44     INFO - REFTEST   IMAGE 2 (REFERENCE): data:image/png;base64,
+16:50:44     INFO - TEST-INFO took 840ms`,
+      "expected": { "pass": 1, "unexpected": 1, "random": 0, "skip": 0 },
+      "expected_images": 2,
+    },
+    { "name": "windows log",
+      "log": `12:17:14     INFO - REFTEST TEST-START | a == b
+12:17:14     INFO - REFTEST TEST-LOAD | a | 1603 / 2053 (78%)
+12:17:14     INFO - REFTEST TEST-LOAD | b | 1603 / 2053 (78%)
+12:17:14     INFO - REFTEST TEST-PASS(EXPECTED RANDOM) | a == b | image comparison, max difference: 0, number of differing pixels: 0
+12:17:14     INFO - REFTEST TEST-END | a == b
+12:17:14     INFO - REFTEST TEST-START | a2 == b2
+12:17:14     INFO - REFTEST TEST-LOAD | a2 | 1604 / 2053 (78%)
+12:17:14     INFO - REFTEST TEST-LOAD | b2 | 1604 / 2053 (78%)
+12:17:14     INFO - REFTEST TEST-UNEXPECTED-FAIL | a2 == b2 | image comparison, max difference: 255, number of differing pixels: 9976
+12:17:14     INFO - REFTEST   IMAGE 1 (TEST): data:image/png;base64,
+12:17:14     INFO - REFTEST   IMAGE 2 (REFERENCE): data:image/png;base64,
+12:17:14     INFO - REFTEST INFO | Saved log: stuff trimmed here
+12:17:14     INFO - REFTEST TEST-END | a2 == b2
+12:01:09     INFO - REFTEST TEST-START | a3 == b3
+12:01:09     INFO - REFTEST TEST-LOAD | a3 | 66 / 189 (34%)
+12:01:09     INFO - REFTEST TEST-LOAD | b3 | 66 / 189 (34%)
+12:01:09     INFO - REFTEST TEST-KNOWN-FAIL | a3 == b3 | image comparison, max difference: 255, number of differing pixels: 9654
+12:01:09     INFO - REFTEST TEST-END | a3 == b3`,
+      "expected": { "pass": 1, "unexpected": 1, "random": 1, "skip": 0 },
+      "expected_images": 2,
+    },
+    { "name": "webrender wrench log (windows)",
+      "log": `[task 2018-12-29T04:29:48.800Z] REFTEST a == b
+[task 2018-12-29T04:29:48.984Z] REFTEST a2 == b2
+[task 2018-12-29T04:29:49.053Z] REFTEST TEST-UNEXPECTED-FAIL | a2 == b2 | image comparison, max difference: 255, number of differing pixels: 3128
+[task 2018-12-29T04:29:49.053Z] REFTEST   IMAGE 1 (TEST): data:image/png;
+[task 2018-12-29T04:29:49.053Z] REFTEST   IMAGE 2 (REFERENCE): data:image/png;
+[task 2018-12-29T04:29:49.053Z] REFTEST TEST-END | a2 == b2`,
+      "expected": { "pass": 0, "unexpected": 1, "random": 0, "skip": 0 },
+      "expected_images": 2,
+    },
+    { "name": "wpt reftests (Linux local; Bug 1530008)",
+      "log": `SUITE-START | Running 1 tests
+TEST-START | /css/css-backgrounds/border-image-6.html
+TEST-UNEXPECTED-FAIL | /css/css-backgrounds/border-image-6.html | Testing http://web-platform.test:8000/css/css-backgrounds/border-image-6.html == http://web-platform.test:8000/css/css-backgrounds/border-image-6-ref.html
+REFTEST   IMAGE 1 (TEST): data:image/png;base64,
+REFTEST   IMAGE 2 (REFERENCE): data:image/png;base64,
+TEST-INFO took 425ms
+SUITE-END | took 2s`,
+      "expected": { "pass": 0, "unexpected": 1, "random": 0, "skip": 0 },
+      "expected_images": 2,
+    },
+    { "name": "wpt reftests (taskcluster log from macOS CI)",
+      "log": `[task 2020-06-26T01:35:29.065Z] 01:35:29     INFO - TEST-START | /html/rendering/non-replaced-elements/the-page/iframe-scrolling-attribute-values.html
+[task 2020-06-26T01:35:29.065Z] 01:35:29     INFO - PID 1353 | 1593135329040    Marionette  INFO    Testing http://web-platform.test:8000/html/rendering/non-replaced-elements/the-page/iframe-scrolling-attribute-values.html == http://web-platform.test:8000/html/rendering/non-replaced-elements/the-page/iframe-scrolling-attribute-values-ref.html
+[task 2020-06-26T01:35:29.673Z] 01:35:29     INFO - PID 1353 | 1593135329633    Marionette  INFO    No differences allowed
+[task 2020-06-26T01:35:29.726Z] 01:35:29     INFO - TEST-KNOWN-INTERMITTENT-FAIL | /html/rendering/non-replaced-elements/the-page/iframe-scrolling-attribute-values.html | took 649ms
+[task 2020-06-26T01:35:29.726Z] 01:35:29     INFO - REFTEST   IMAGE 1 (TEST): data:image/png;
+[task 2020-06-26T01:35:29.726Z] 01:35:29     INFO - REFTEST   IMAGE 2 (REFERENCE): data:image/png;`,
+      "expected": { "pass": 0, "unexpected": 0, "random": 1, "skip": 0 },
+      "expected_images": 2,
+    },
+    { "name": "wpt reftests (taskcluster log from Windows CI)",
+      "log": `[task 2020-06-26T01:41:19.205Z] 01:41:19     INFO - TEST-START | /html/rendering/non-replaced-elements/the-page/iframe-scrolling-attribute-values.html
+[task 2020-06-26T01:41:19.214Z] 01:41:19     INFO - PID 5920 | 1593135679202    Marionette  WARN    [24] http://web-platform.test:8000/css/WOFF2/metadatadisplay-schema-license-022-ref.xht overflows viewport (width: 783, height: 731)
+[task 2020-06-26T01:41:19.214Z] 01:41:19     INFO - PID 9692 | 1593135679208    Marionette  INFO    Testing http://web-platform.test:8000/html/rendering/non-replaced-elements/the-page/iframe-scrolling-attribute-values.html == http://web-platform.test:8000/html/rendering/non-replaced-elements/the-page/iframe-scrolling-attribute-values-ref.html
+[task 2020-06-26T01:41:19.638Z] 01:41:19     INFO - PID 9692 | 1593135679627    Marionette  INFO    No differences allowed
+[task 2020-06-26T01:41:19.688Z] 01:41:19     INFO - TEST-KNOWN-INTERMITTENT-PASS | /html/rendering/non-replaced-elements/the-page/iframe-scrolling-attribute-values.html | took 474ms
+[task 2020-06-26T01:41:19.688Z] 01:41:19     INFO - REFTEST   IMAGE 1 (TEST): data:image/png;
+[task 2020-06-26T01:41:19.689Z] 01:41:19     INFO - REFTEST   IMAGE 2 (REFERENCE): data:image/png;`,
+      "expected": { "pass": 1, "unexpected": 0, "random": 1, "skip": 0 },
+      "expected_images": 2,
+    },
+    { "name": "local reftest run with timestamps (Linux; Bug 1167712)",
+      "log": ` 0:05.21 REFTEST TEST-START | a
+ 0:05.21 REFTEST REFTEST TEST-LOAD | a | 0 / 1 (0%)
+ 0:05.27 REFTEST REFTEST TEST-LOAD | b | 0 / 1 (0%)
+ 0:05.66 REFTEST TEST-UNEXPECTED-FAIL | a | image comparison (==), max difference: 106, number of differing pixels: 800
+ 0:05.67 REFTEST REFTEST   IMAGE 1 (TEST): data:image/png;base64,
+ 0:05.67 REFTEST REFTEST   IMAGE 2 (REFERENCE): data:image/png;base64,
+ 0:05.73 REFTEST REFTEST TEST-END | a`,
+      "expected": { "pass": 0, "unexpected": 1, "random": 0, "skip": 0 },
+      "expected_images": 2,
+    },
+    { "name": "reftest run with whitespace compressed (Treeherder; Bug 1084322)",
+      "log": ` REFTEST TEST-START | a
+REFTEST TEST-LOAD | a | 0 / 1 (0%)
+REFTEST TEST-LOAD | b | 0 / 1 (0%)
+REFTEST TEST-UNEXPECTED-FAIL | a | image comparison (==), max difference: 106, number of differing pixels: 800
+REFTEST REFTEST IMAGE 1 (TEST): data:image/png;base64,
+REFTEST REFTEST IMAGE 2 (REFERENCE): data:image/png;base64,
+REFTEST REFTEST TEST-END | a`,
+      "expected": { "pass": 0, "unexpected": 1, "random": 0, "skip": 0 },
+      "expected_images": 2,
+    },
+  ];
+
+  var current_test = 0;
+
+  // Override the build_viewer function invoked at the end of process_log to
+  // actually just check the results of parsing.
+  build_viewer = function() {
+    var expected = testcases[current_test].expected;
+    var expected_images = testcases[current_test].expected_images;
+    for (var result of gTestItems) {
+      for (let type in expected) { // type is "pass", "unexpected" etc.
+        if (result[type]) {
+          expected[type]--;
+        }
+      }
+    }
+    var failed = false;
+    for (let type in expected) {
+      if (expected[type] != 0) {
+        console.log(`Failure: for testcase ${testcases[current_test].name} got ${expected[type]} fewer ${type} results than expected!`);
+        failed = true;
+      }
+    }
+
+    let total_images = 0;
+    for (var result of gTestItems) {
+      total_images += result.images.length;
+    }
+    if (total_images !== expected_images) {
+      console.log(`Failure: for testcase ${testcases[current_test].name} got ${total_images} images, expected ${expected_images}`);
+      failed = true;
+    }
+
+    if (!failed) {
+      console.log(`Success for testcase ${testcases[current_test].name}`);
+    }
+  };
+
+  while (current_test < testcases.length) {
+    process_log(testcases[current_test].log);
+    current_test++;
+  }
+}
+
+function process_log(contents) {
+  var lines = contents.split(/[\r\n]+/);
+  gTestItems = [];
+  for (var j in lines) {
+
+    // !!!!!!
+    // When making any changes to this code, please add a test to the
+    // test_parsing function above, and ensure all existing tests pass.
+    // !!!!!!
+
+    var line = lines[j];
+    // Ignore duplicated output in logcat.
+    if (line.match(/I\/Gecko.*?REFTEST/))
+      continue;
+    var match = line.match(/^.*?(?:REFTEST\s+)+(.*)$/);
+    if (!match) {
+      // WPT reftests don't always have the "REFTEST" prefix but do have
+      // mozharness prefixing. Trying to match both prefixes optionally with a
+      // single regex either makes an unreadable mess or matches everything so
+      // we do them separately.
+      match = line.match(/^(?:.*? (?:INFO|ERROR) -\s+)(.*)$/);
+    }
+    if (match)
+      line = match[1];
+    match = line.match(/^(TEST-PASS|TEST-UNEXPECTED-PASS|TEST-FAIL|TEST-KNOWN-FAIL|TEST-UNEXPECTED-FAIL|TEST-DEBUG-INFO|TEST-KNOWN-INTERMITTENT-FAIL|TEST-KNOWN-INTERMITTENT-PASS)(\(EXPECTED RANDOM\)|) \| ([^\|]+)(?: \|(.*)|$)/);
+    if (match) {
+      var state = match[1];
+      var random = match[2];
+      var url = match[3];
+      var extra = match[4];
+      gTestItems.push(
+        {
+          pass: !state.match(/DEBUG-INFO$|FAIL$/),
+          // only one of the following three should ever be true
+          unexpected: !!state.match(/^TEST-UNEXPECTED/),
+          random: (random == "(EXPECTED RANDOM)" || state == "TEST-KNOWN-INTERMITTENT-FAIL" || state == "TEST-KNOWN-INTERMITTENT-PASS"),
+          skip: (extra == " (SKIP)"),
+          url: url,
+          images: [],
+          imageLabels: []
+        });
+      continue;
+    }
+    match = line.match(/^IMAGE([^:]*): (data:.*)$/);
+    if (match) {
+      var item = gTestItems[gTestItems.length - 1];
+      item.images.push(match[2]);
+      item.imageLabels.push(match[1]);
+    }
+  }
+
+  build_viewer();
+}
+
+function build_viewer() {
+  if (gTestItems.length == 0) {
+    show_phase("entry");
+    return;
+  }
+
+  var cell = ID("itemlist");
+  while (cell.childNodes.length > 0)
+    cell.removeChild(cell.childNodes[cell.childNodes.length - 1]);
+
+  var table = document.createElement("table");
+  var tbody = document.createElement("tbody");
+  table.appendChild(tbody);
+
+  for (var i in gTestItems) {
+    var item = gTestItems[i];
+
+    // optional url filter for only showing unexpected results
+    if (parseInt(gParams.only_show_unexpected) && !item.unexpected)
+      continue;
+
+    // XXX regardless skip expected pass items until we have filtering UI
+    if (item.pass && !item.unexpected)
+      continue;
+
+    var tr = document.createElement("tr");
+    var rowclass = item.pass ? "pass" : "fail";
+    var td;
+    var text;
+
+    td = document.createElement("td");
+    text = "";
+    if (item.unexpected) { text += "!"; rowclass += " unexpected"; }
+    if (item.random) { text += "R"; rowclass += " random"; }
+    if (item.skip) { text += "S"; rowclass += " skip"; }
+    td.appendChild(document.createTextNode(text));
+    tr.appendChild(td);
+
+    td = document.createElement("td");
+    td.id = "item" + i;
+    td.className = "url";
+    // Only display part of URL after "/mozilla/".
+    var match = item.url.match(/\/mozilla\/(.*)/);
+    text = document.createTextNode(match ? match[1] : item.url);
+    if (item.images.length > 0) {
+      var a = document.createElement("a");
+      a.href = "javascript:show_images(" + i + ")";
+      a.appendChild(text);
+      td.appendChild(a);
+    } else {
+      td.appendChild(text);
+    }
+    tr.appendChild(td);
+
+    tbody.appendChild(tr);
+  }
+
+  cell.appendChild(table);
+
+  show_phase("viewer");
+}
+
+function get_image_data(src, whenReady) {
+  var img = new Image();
+  img.onload = function() {
+    var canvas = document.createElement("canvas");
+    canvas.width = img.naturalWidth;
+    canvas.height = img.naturalHeight;
+
+    var ctx = canvas.getContext("2d");
+    ctx.drawImage(img, 0, 0);
+
+    whenReady(ctx.getImageData(0, 0, img.naturalWidth, img.naturalHeight));
+  };
+  img.src = src;
+}
+
+function sync_svg_size(imageData) {
+  // We need the size of the 'svg' and its 'image' elements to match the size
+  // of the ImageData objects that we're going to read pixels from or else our
+  // magnify() function will be very broken.
+  ID("svg").setAttribute("width", imageData.width);
+  ID("svg").setAttribute("height", imageData.height);
+}
+
+function show_images(i) {
+  var item = gTestItems[i];
+  var cell = ID("images");
+
+  // Remove activeitem class from any existing elements
+  var activeItems = document.querySelectorAll(".activeitem");
+  for (var activeItemIdx = activeItems.length; activeItemIdx-- != 0;) {
+    activeItems[activeItemIdx].classList.remove("activeitem");
+  }
+
+  ID("item" + i).classList.add("activeitem");
+  ID("image1").style.display = "";
+  ID("image2").style.display = "none";
+  ID("diffrect").style.display = "none";
+  ID("imgcontrols").reset();
+  ID("pixel-differences").textContent = "";
+
+  ID("image1").setAttributeNS(XLINK_NS, "xlink:href", item.images[0]);
+  // Making the href be #image1 doesn't seem to work
+  ID("feimage1").setAttributeNS(XLINK_NS, "xlink:href", item.images[0]);
+  if (item.images.length == 1) {
+    ID("imgcontrols").style.display = "none";
+  } else {
+    ID("imgcontrols").style.display = "";
+
+    ID("image2").setAttributeNS(XLINK_NS, "xlink:href", item.images[1]);
+    // Making the href be #image2 doesn't seem to work
+    ID("feimage2").setAttributeNS(XLINK_NS, "xlink:href", item.images[1]);
+
+    ID("label1").textContent = 'Image ' + item.imageLabels[0];
+    ID("label2").textContent = 'Image ' + item.imageLabels[1];
+  }
+
+  cell.style.display = "";
+
+  let loaded = [false, false];
+
+  function images_loaded(id) {
+    loaded[id] = true;
+    if (loaded.every(x => x)) {
+      update_pixel_difference_text()
+    }
+  }
+
+  get_image_data(item.images[0], function(data) { gImage1Data = data; sync_svg_size(gImage1Data); images_loaded(0)});
+  get_image_data(item.images[1], function(data) { gImage2Data = data; images_loaded(1)});
+
+}
+
+function update_pixel_difference_text() {
+  let differenceText;
+  if (gImage1Data.height !== gImage2Data.height ||
+      gImage1Data.width !== gImage2Data.width) {
+    differenceText = "Images are different sizes"
+  } else {
+    let [numPixels, maxPerChannel] = get_pixel_differences();
+    if (!numPixels) {
+      differenceText = "Images are identical";
+    } else {
+      differenceText = `Maximum difference per channel ${maxPerChannel}, ${numPixels} pixels differ`;
+    }
+  }
+  // Disable this for now, because per bug 1633504, the numbers may be
+  // inaccurate and dependent on the browser's configuration.
+  // ID("pixel-differences").textContent = differenceText;
+}
+
+function get_pixel_differences() {
+  let numPixels = 0;
+  let maxPerChannel = 0;
+  for (var i=0; i<gImage1Data.data.length; i+=4) {
+    let r1 = gImage1Data.data[i];
+    let r2 = gImage2Data.data[i];
+    let g1 = gImage1Data.data[i+1];
+    let g2 = gImage2Data.data[i+1];
+    let b1 = gImage1Data.data[i+2];
+    let b2 = gImage2Data.data[i+2];
+    // Ignore alpha.
+    if (r1 == r2 && g1 == g2 && b1 == b2) {
+      continue;
+    }
+    numPixels += 1;
+    let maxDiff = Math.max(Math.abs(r1-r2),
+                           Math.abs(g1-g2),
+                           Math.abs(b1-b2));
+    if (maxDiff > maxPerChannel) {
+      maxPerChannel = maxDiff
+    }
+  }
+  return [numPixels, maxPerChannel];
+}
+
+function show_image(i) {
+  if (i == 1) {
+    ID("image1").style.display = "";
+    ID("image2").style.display = "none";
+  } else {
+    ID("image1").style.display = "none";
+    ID("image2").style.display = "";
+  }
+}
+
+function handle_keyboard_shortcut(event) {
+  switch (event.charCode) {
+  case 49: // "1" key
+    document.getElementById("radio1").checked = true;
+    show_image(1);
+    break;
+  case 50: // "2" key
+    document.getElementById("radio2").checked = true;
+    show_image(2);
+    break;
+  case 100: // "d" key
+    document.getElementById("differences").click();
+    break;
+  case 112: // "p" key
+    shift_images(-1);
+    break;
+  case 110: // "n" key
+    shift_images(1);
+    break;
+  }
+}
+
+function handle_keydown(event) {
+  switch (event.keyCode) {
+  case 37:  // left arrow
+    move_pixel(-1, 0);
+    break;
+  case 38:  // up arrow
+    move_pixel(0,-1);
+    break;
+  case 39:  // right arrow
+    move_pixel(1, 0);
+    break;
+  case 40:  // down arrow
+    move_pixel(0, 1);
+    break;
+  }
+}
+
+function shift_images(dir) {
+  var activeItem = document.querySelector(".activeitem");
+  if (!activeItem) {
+    return;
+  }
+  for (var elm = activeItem; elm; elm = elm.parentElement) {
+    if (elm.tagName != "tr") {
+      continue;
+    }
+    elm = dir > 0 ? elm.nextElementSibling : elm.previousElementSibling;
+    if (elm) {
+      elm.getElementsByTagName("a")[0].click();
+    }
+    return;
+  }
+}
+
+function show_differences(cb) {
+  ID("diffrect").style.display = cb.checked ? "" : "none";
+}
+
+function flash_pixels(on) {
+  var stroke = on ? "red" : "black";
+  var strokeWidth = on ? "2px" : "1px";
+  for (var i = 0; i < gFlashingPixels.length; i++) {
+    gFlashingPixels[i].setAttribute("stroke", stroke);
+    gFlashingPixels[i].setAttribute("stroke-width", strokeWidth);
+  }
+}
+
+function cursor_point(evt) {
+  var m = evt.target.getScreenCTM().inverse();
+  var p = ID("svg").createSVGPoint();
+  p.x = evt.clientX;
+  p.y = evt.clientY;
+  p = p.matrixTransform(m);
+  return { x: Math.floor(p.x), y: Math.floor(p.y) };
+}
+
+function hex2(i) {
+  return (i < 16 ? "0" : "") + i.toString(16);
+}
+
+function canvas_pixel_as_hex(data, x, y) {
+  var offset = (y * data.width + x) * 4;
+  var r = data.data[offset];
+  var g = data.data[offset + 1];
+  var b = data.data[offset + 2];
+  return "#" + hex2(r) + hex2(g) + hex2(b);
+}
+
+function hex_as_rgb(hex) {
+  return "rgb(" + [parseInt(hex.substring(1, 3), 16), parseInt(hex.substring(3, 5), 16), parseInt(hex.substring(5, 7), 16)] + ")";
+}
+
+function magnify(evt) {
+  var { x: x, y: y } = cursor_point(evt);
+  do_magnify(x, y);
+}
+
+function do_magnify(x, y) {
+  var centerPixelColor1, centerPixelColor2;
+
+  var dx_lo = -Math.floor(gMagWidth / 2);
+  var dx_hi = Math.floor(gMagWidth / 2);
+  var dy_lo = -Math.floor(gMagHeight / 2);
+  var dy_hi = Math.floor(gMagHeight / 2);
+
+  flash_pixels(false);
+  gFlashingPixels = [];
+  for (var j = dy_lo; j <= dy_hi; j++) {
+    for (var i = dx_lo; i <= dx_hi; i++) {
+      var px = x + i;
+      var py = y + j;
+      var p1 = gMagPixPaths[i + dx_hi][j + dy_hi][0];
+      var p2 = gMagPixPaths[i + dx_hi][j + dy_hi][1];
+      // Here we just use the dimensions of gImage1Data since we expect test
+      // and reference to have the same dimensions.
+      if (px < 0 || py < 0 || px >= gImage1Data.width || py >= gImage1Data.height) {
+        p1.setAttribute("fill", "#aaa");
+        p2.setAttribute("fill", "#888");
+      } else {
+        var color1 = canvas_pixel_as_hex(gImage1Data, x + i, y + j);
+        var color2 = canvas_pixel_as_hex(gImage2Data, x + i, y + j);
+        p1.setAttribute("fill", color1);
+        p2.setAttribute("fill", color2);
+        if (color1 != color2) {
+          gFlashingPixels.push(p1, p2);
+          p1.parentNode.appendChild(p1);
+          p2.parentNode.appendChild(p2);
+        }
+        if (i == 0 && j == 0) {
+          centerPixelColor1 = color1;
+          centerPixelColor2 = color2;
+        }
+      }
+    }
+  }
+  flash_pixels(true);
+  show_pixelinfo(x, y, centerPixelColor1, hex_as_rgb(centerPixelColor1), centerPixelColor2, hex_as_rgb(centerPixelColor2));
+}
+
+function show_pixelinfo(x, y, pix1rgb, pix1hex, pix2rgb, pix2hex) {
+  var pixelinfo = ID("pixelinfo");
+  ID("coords").textContent = [x, y];
+  ID("pix1hex").textContent = pix1hex;
+  ID("pix1rgb").textContent = pix1rgb;
+  ID("pix2hex").textContent = pix2hex;
+  ID("pix2rgb").textContent = pix2rgb;
+}
+
+function move_pixel(deltax, deltay) {
+  coords = ID("coords").textContent.split(',');
+  x = parseInt(coords[0]);
+  y = parseInt(coords[1]);
+  if (isNaN(x) || isNaN(y)) {
+    return;
+  }
+  x = x + deltax;
+  y = y + deltay;
+  if (x >= 0 && y >= 0 && x < gImage1Data.width && y < gImage1Data.height) {
+    do_magnify(x, y);
+  }
+}
+
+  ]]></script>
+
+</head>
+<body onload="load()">
+
+<div id="entry">
+
+<h1>Reftest analyzer: load reftest log</h1>
+
+<p>Either paste your log into this textarea:<br />
+<textarea cols="80" rows="10" id="logentry"/><br/>
+<input type="button" value="Process pasted log" onclick="log_pasted()" /></p>
+
+<p>... or load it from a file:<br/>
+<input type="file" id="fileentry" onchange="fileentry_changed()" />
+</p>
+</div>
+
+<div id="loading" style="display:none">Loading log...</div>
+
+<div id="viewer" style="display:none">
+  <div id="pixelarea">
+    <div id="pixelinfo">
+      <table>
+        <tbody>
+          <tr><th>Pixel at:</th><td colspan="2" id="coords"/></tr>
+          <tr><th>Image 1:</th><td id="pix1rgb"></td><td id="pix1hex"></td></tr>
+          <tr><th>Image 2:</th><td id="pix2rgb"></td><td id="pix2hex"></td></tr>
+        </tbody>
+      </table>
+      <div>
+        <div id="pixelhint">★
+          <div>
+            <p>Move the mouse over the reftest image on the right to show
+            magnified pixels on the left.  The color information above is for
+            the pixel centered in the magnified view.</p>
+            <p>Image 1 is shown in the upper triangle of each pixel and Image 2
+            is shown in the lower triangle.</p>
+          </div>
+        </div>
+      </div>
+    </div>
+    <div id="magnification">
+      <svg xmlns="http://www.w3.org/2000/svg" width="84" height="84" shape-rendering="optimizeSpeed">
+        <g id="mag"/>
+      </svg>
+    </div>
+  </div>
+  <div id="itemlist"></div>
+  <div id="images" style="display:none">
+    <form id="imgcontrols">
+    <input id="radio1" type="radio" name="which" value="0" onchange="show_image(1)" checked="checked" /><label id="label1" title="1" for="radio1">Image 1</label>
+    <input id="radio2" type="radio" name="which" value="1" onchange="show_image(2)"                   /><label id="label2" title="2" for="radio2">Image 2</label>
+    <label><input id="differences" type="checkbox" onchange="show_differences(this)" />Circle differences</label>
+    </form>
+    <svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" version="1.1" width="800" height="1000" id="svg">
+      <defs>
+        <!-- use sRGB to avoid loss of data -->
+        <filter id="showDifferences" x="0%" y="0%" width="100%" height="100%"
+                style="color-interpolation-filters: sRGB">
+          <feImage id="feimage1" result="img1" xlink:href="#image1" />
+          <feImage id="feimage2" result="img2" xlink:href="#image2" />
+          <!-- inv1 and inv2 are the images with RGB inverted -->
+          <feComponentTransfer result="inv1" in="img1">
+            <feFuncR type="linear" slope="-1" intercept="1" />
+            <feFuncG type="linear" slope="-1" intercept="1" />
+            <feFuncB type="linear" slope="-1" intercept="1" />
+          </feComponentTransfer>
+          <feComponentTransfer result="inv2" in="img2">
+            <feFuncR type="linear" slope="-1" intercept="1" />
+            <feFuncG type="linear" slope="-1" intercept="1" />
+            <feFuncB type="linear" slope="-1" intercept="1" />
+          </feComponentTransfer>
+          <!-- w1 will have non-white pixels anywhere that img2
+               is brighter than img1, and w2 for the reverse.
+               It would be nice not to have to go through these
+               intermediate states, but feComposite
+               type="arithmetic" can't transform the RGB channels
+               and leave the alpha channel untouched. -->
+          <feComposite result="w1" in="img1" in2="inv2" operator="arithmetic" k2="1" k3="1" />
+          <feComposite result="w2" in="img2" in2="inv1" operator="arithmetic" k2="1" k3="1" />
+          <!-- c1 will have non-black pixels anywhere that img2
+               is brighter than img1, and c2 for the reverse -->
+          <feComponentTransfer result="c1" in="w1">
+            <feFuncR type="linear" slope="-1" intercept="1" />
+            <feFuncG type="linear" slope="-1" intercept="1" />
+            <feFuncB type="linear" slope="-1" intercept="1" />
+          </feComponentTransfer>
+          <feComponentTransfer result="c2" in="w2">
+            <feFuncR type="linear" slope="-1" intercept="1" />
+            <feFuncG type="linear" slope="-1" intercept="1" />
+            <feFuncB type="linear" slope="-1" intercept="1" />
+          </feComponentTransfer>
+          <!-- c will be nonblack (and fully on) for every pixel+component where there are differences -->
+          <feComposite result="c" in="c1" in2="c2" operator="arithmetic" k2="255" k3="255" />
+          <!-- a will be opaque for every pixel with differences and transparent for all others -->
+          <feColorMatrix result="a" type="matrix" values="0 0 0 0 0  0 0 0 0 0  0 0 0 0 0  1 1 1 0 0" />
+
+          <!-- a, dilated by 1 pixel -->
+          <feMorphology result="dila1" in="a" operator="dilate" radius="1" />
+          <!-- a, dilated by 2 pixels -->
+          <feMorphology result="dila2" in="dila1" operator="dilate" radius="1" />
+
+          <!-- all the pixels in the 2-pixel dilation of a but not in the 1-pixel dilation, to highlight the diffs -->
+          <feComposite result="highlight" in="dila2" in2="dila1" operator="out" />
+
+          <feFlood result="red" flood-color="red" />
+          <feComposite result="redhighlight" in="red" in2="highlight" operator="in" />
+          <feFlood result="black" flood-color="black" flood-opacity="0.5" />
+          <feMerge>
+            <feMergeNode in="black" />
+            <feMergeNode in="redhighlight" />
+          </feMerge>
+        </filter>
+      </defs>
+      <g onmousemove="magnify(evt)">
+        <image x="0" y="0" width="100%" height="100%" id="image1" />
+        <image x="0" y="0" width="100%" height="100%" id="image2" />
+      </g>
+      <rect id="diffrect" filter="url(#showDifferences)" pointer-events="none" x="0" y="0" width="100%" height="100%" />
+    </svg>
+    <div id="pixel-differences"></div>
+  </div>
+</div>
+
+</body>
+</html>
diff --git a/test/wpt/tests/common/utils.js.headers b/test/wpt/tests/common/utils.js.headers
new file mode 100644
index 00000000000..6805c323df5
--- /dev/null
+++ b/test/wpt/tests/common/utils.js.headers
@@ -0,0 +1 @@
+Content-Type: text/javascript; charset=utf-8
diff --git a/test/wpt/tests/common/window-name-setter.html b/test/wpt/tests/common/window-name-setter.html
new file mode 100644
index 00000000000..c0603aa3008
--- /dev/null
+++ b/test/wpt/tests/common/window-name-setter.html
@@ -0,0 +1,12 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>A page that sets window.name</title>
+
+<script>
+"use strict";
+
+window.onload = () => {
+  window.name = location.hash.slice(1);  // Drop the first '#' character.
+  window.name = "spices";
+};
+</script>
diff --git a/test/wpt/tests/common/worklet-reftest.js b/test/wpt/tests/common/worklet-reftest.js
new file mode 100644
index 00000000000..e05d4ee801b
--- /dev/null
+++ b/test/wpt/tests/common/worklet-reftest.js
@@ -0,0 +1,50 @@
+/**
+ * Imports code into a worklet. E.g.
+ *
+ * importWorklet(CSS.paintWorklet, {url: 'script.js'});
+ * importWorklet(CSS.paintWorklet, '(javascript string)');
+ *
+ * @param {Worklet} worklet
+ * @param {(Object|string)} code
+ */
+function importWorklet(worklet, code) {
+    let url;
+    if (typeof code === 'object') {
+      url = code.url;
+    } else {
+      const blob = new Blob([code], {type: 'text/javascript'});
+      url = URL.createObjectURL(blob);
+    }
+
+    return worklet.addModule(url);
+}
+
+/** @private */
+async function animationFrames(frames) {
+  for (let i = 0; i < frames; i++)
+    await new Promise(requestAnimationFrame);
+}
+
+/** @private */
+async function workletPainted() {
+    await animationFrames(2);
+}
+
+/**
+ * To make sure that we take the snapshot at the right time, we do double
+ * requestAnimationFrame. In the second frame, we take a screenshot, that makes
+ * sure that we already have a full frame.
+ *
+ * @param {Worklet} worklet
+ * @param {(Object|string)} code
+ */
+async function importWorkletAndTerminateTestAfterAsyncPaint(worklet, code) {
+    if (typeof worklet === 'undefined') {
+        takeScreenshot();
+        return;
+    }
+
+    await importWorklet(worklet, code);
+    await workletPainted();
+    takeScreenshot();
+}
diff --git a/test/wpt/tests/common/worklet-reftest.js.headers b/test/wpt/tests/common/worklet-reftest.js.headers
new file mode 100644
index 00000000000..6805c323df5
--- /dev/null
+++ b/test/wpt/tests/common/worklet-reftest.js.headers
@@ -0,0 +1 @@
+Content-Type: text/javascript; charset=utf-8
diff --git a/test/wpt/tests/fetch/META.yml b/test/wpt/tests/fetch/META.yml
new file mode 100644
index 00000000000..81432ff5f5c
--- /dev/null
+++ b/test/wpt/tests/fetch/META.yml
@@ -0,0 +1,7 @@
+spec: https://fetch.spec.whatwg.org/
+suggested_reviewers:
+  - jdm
+  - youennf
+  - annevk
+  - mnot
+  - yutakahirano
diff --git a/test/wpt/tests/fetch/README.md b/test/wpt/tests/fetch/README.md
new file mode 100644
index 00000000000..dcaad0219d5
--- /dev/null
+++ b/test/wpt/tests/fetch/README.md
@@ -0,0 +1,6 @@
+Tests for the [Fetch Standard](https://fetch.spec.whatwg.org/).
+
+More Fetch tests can be found in
+
+* /cors
+* /xhr
diff --git a/test/wpt/tests/fetch/api/abort/cache.https.any.js b/test/wpt/tests/fetch/api/abort/cache.https.any.js
new file mode 100644
index 00000000000..bdaf0e69e58
--- /dev/null
+++ b/test/wpt/tests/fetch/api/abort/cache.https.any.js
@@ -0,0 +1,47 @@
+// META: title=Request signals &amp; the cache API
+// META: global=window,worker
+
+promise_test(async () => {
+  await caches.delete('test');
+  const controller = new AbortController();
+  const signal = controller.signal;
+  const request = new Request('../resources/data.json', { signal });
+
+  const cache = await caches.open('test');
+  await cache.put(request, new Response(''));
+
+  const requests = await cache.keys();
+
+  assert_equals(requests.length, 1, 'Ensuring cleanup worked');
+
+  const [cachedRequest] = requests;
+
+  controller.abort();
+
+  assert_false(cachedRequest.signal.aborted, "Request from cache shouldn't be aborted");
+
+  const data = await fetch(cachedRequest).then(r => r.json());
+  assert_equals(data.key, 'value', 'Fetch fully completes');
+}, "Signals are not stored in the cache API");
+
+promise_test(async () => {
+  await caches.delete('test');
+  const controller = new AbortController();
+  const signal = controller.signal;
+  const request = new Request('../resources/data.json', { signal });
+  controller.abort();
+
+  const cache = await caches.open('test');
+  await cache.put(request, new Response(''));
+
+  const requests = await cache.keys();
+
+  assert_equals(requests.length, 1, 'Ensuring cleanup worked');
+
+  const [cachedRequest] = requests;
+
+  assert_false(cachedRequest.signal.aborted, "Request from cache shouldn't be aborted");
+
+  const data = await fetch(cachedRequest).then(r => r.json());
+  assert_equals(data.key, 'value', 'Fetch fully completes');
+}, "Signals are not stored in the cache API, even if they're already aborted");
diff --git a/test/wpt/tests/fetch/api/abort/destroyed-context.html b/test/wpt/tests/fetch/api/abort/destroyed-context.html
new file mode 100644
index 00000000000..161d39bd9ce
--- /dev/null
+++ b/test/wpt/tests/fetch/api/abort/destroyed-context.html
@@ -0,0 +1,27 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script>
+// This is a regression test for crbug.com/860063.
+window.controller = new AbortController();
+async_test(t => {
+  onmessage = t.step_func(event => {
+    assert_equals(event.data, 'started');
+    const iframe = document.querySelector('iframe');
+    document.body.removeChild(iframe);
+    controller.abort();
+    t.done();
+  });
+}, 'aborting a fetch in a destroyed context should not crash');
+</script>
+<iframe srcdoc="
+                <!DOCTYPE html>
+                <meta charset=utf-8>
+                <script>
+                fetch('../resources/infinite-slow-response.py', { signal: parent.controller.signal }).then(() => {
+                  parent.postMessage('started', '*');
+                });
+                </script>
+                ">
+</iframe>
diff --git a/test/wpt/tests/fetch/api/abort/keepalive.html b/test/wpt/tests/fetch/api/abort/keepalive.html
new file mode 100644
index 00000000000..db12df0d289
--- /dev/null
+++ b/test/wpt/tests/fetch/api/abort/keepalive.html
@@ -0,0 +1,85 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/common/utils.js"></script>
+<script>
+// This controller must be on the window so it is visible to the iframe.
+window.sharedController = new AbortController();
+
+async function fetchJson(url) {
+  const response = await fetch(url);
+  assert_true(response.ok, 'response should be ok');
+  return response.json();
+}
+
+promise_test(async () => {
+  const stateKey = token();
+  const controller = new AbortController();
+  await fetch(`../resources/infinite-slow-response.py?stateKey=${stateKey}`,
+              {
+                signal: controller.signal,
+                keepalive: true
+              });
+  const before = await fetchJson(`../resources/stash-take.py?key=${stateKey}`);
+  assert_equals(before, 'open', 'connection should be open');
+
+  controller.abort();
+
+  // Spin until the abort completes.
+  while (true) {
+    const after = await fetchJson(`../resources/stash-take.py?key=${stateKey}`);
+    if (after) {
+      // stateKey='open' was removed from the dictionary by the first fetch of
+      // stash-take.py, so we should only ever see the value 'closed' here.
+      assert_equals(after, 'closed', 'connection should have closed');
+      break;
+    }
+  }
+}, 'aborting a keepalive fetch should work');
+
+promise_test(async t => {
+  const key = token();
+  const iframeEl = document.querySelector('iframe');
+
+  // Tell the iframe to start the fetch, and wait until it says it has.
+  await new Promise(resolve => {
+    onmessage = t.step_func(event => {
+      assert_equals(event.data, 'started', 'event data should be "started"');
+      resolve();
+    });
+    iframeEl.contentWindow.postMessage(key, '*');
+  });
+
+  // Detach the context of the fetch.
+  iframeEl.remove();
+
+  sharedController.abort();
+
+  // The abort should not do anything. The connection should stay open. Wait 1
+  // second to give time for the fetch to complete.
+  await new Promise(resolve => t.step_timeout(resolve, 1000));
+
+  const after = await fetchJson(`../resources/stash-take.py?key=${key}`);
+  assert_equals(after, 'on', 'fetch should have completed');
+}, 'aborting a detached keepalive fetch should not do anything');
+</script>
+
+<iframe srcdoc="
+                <!DOCTYPE html>
+                <meta charset=utf-8>
+                <script>
+                onmessage = async event => {
+                  const key = event.data;
+                  await fetch(
+                    `../resources/redirect.py?delay=500&amp;location=` +
+                    `../resources/stash-put.py%3fkey=${key}%26value=on`,
+                        {
+                          signal: parent.sharedController.signal,
+                          keepalive: true
+                        });
+                  parent.postMessage('started', '*');
+                };
+                </script>
+                ">
+</iframe>
diff --git a/test/wpt/tests/fetch/api/abort/serviceworker-intercepted.https.html b/test/wpt/tests/fetch/api/abort/serviceworker-intercepted.https.html
new file mode 100644
index 00000000000..ed9bc973e80
--- /dev/null
+++ b/test/wpt/tests/fetch/api/abort/serviceworker-intercepted.https.html
@@ -0,0 +1,212 @@
+<!DOCTYPE html>
+<html>
+<head>
+  <meta charset="utf-8">
+  <title>Aborting fetch when intercepted by a service worker</title>
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  <script src="../../../service-workers/service-worker/resources/test-helpers.sub.js"></script>
+</head>
+<body>
+<script>
+  // Duplicating this resource to make service worker scoping simpler.
+  const SCOPE = '../resources/basic.html';
+  const BODY_METHODS = ['arrayBuffer', 'blob', 'formData', 'json', 'text'];
+
+  const error1 = new Error('error1');
+  error1.name = 'error1';
+
+  async function setupRegistration(t, scope, service_worker) {
+    const reg = await navigator.serviceWorker.register(service_worker, { scope });
+    await wait_for_state(t, reg.installing, 'activated');
+    add_completion_callback(_ => reg.unregister());
+    return reg;
+  }
+
+  promise_test(async t => {
+    const suffix = "?q=aborted-not-intercepted";
+    const scope = SCOPE + suffix;
+    await setupRegistration(t, scope, '../resources/sw-intercept.js');
+    const iframe = await with_iframe(scope);
+    add_completion_callback(_ => iframe.remove());
+    const w = iframe.contentWindow;
+
+    const controller = new w.AbortController();
+    const signal = controller.signal;
+    controller.abort();
+
+    const nextData = new Promise(resolve => {
+      w.navigator.serviceWorker.addEventListener('message', function once(event) {
+        // The message triggered by the iframe's document's fetch
+        // request cannot get dispatched by the time we add the event
+        // listener, so we have to guard against it.
+        if (!event.data.endsWith(suffix)) {
+          w.navigator.serviceWorker.removeEventListener('message', once);
+          resolve(event.data);
+        }
+      })
+    });
+
+    const fetchPromise = w.fetch('data.json', { signal });
+
+    await promise_rejects_dom(t, "AbortError", w.DOMException, fetchPromise);
+
+    await w.fetch('data.json?no-abort');
+
+    assert_true((await nextData).endsWith('?no-abort'), "Aborted request does not go through service worker");
+  }, "Already aborted request does not land in service worker");
+
+  for (const bodyMethod of BODY_METHODS) {
+    promise_test(async t => {
+      const scope = SCOPE + "?q=aborted-" + bodyMethod + "-rejects";
+      await setupRegistration(t, scope, '../resources/sw-intercept.js');
+      const iframe = await with_iframe(scope);
+      add_completion_callback(_ => iframe.remove());
+      const w = iframe.contentWindow;
+
+      const controller = new w.AbortController();
+      const signal = controller.signal;
+
+      const log = [];
+      const response = await w.fetch('data.json', { signal });
+
+      controller.abort();
+
+      const bodyPromise = response[bodyMethod]();
+
+      await Promise.all([
+        bodyPromise.catch(() => log.push(`${bodyMethod}-reject`)),
+        Promise.resolve().then(() => log.push('next-microtask'))
+      ]);
+
+      await promise_rejects_dom(t, "AbortError", w.DOMException, bodyPromise);
+
+      assert_array_equals(log, [`${bodyMethod}-reject`, 'next-microtask']);
+    }, `response.${bodyMethod}() rejects if already aborted`);
+  }
+
+  promise_test(async t => {
+    const scope = SCOPE + "?q=aborted-stream-errors";
+    await setupRegistration(t, scope, '../resources/sw-intercept.js');
+    const iframe = await with_iframe(scope);
+    add_completion_callback(_ => iframe.remove());
+    const w = iframe.contentWindow;
+
+    const controller = new w.AbortController();
+    const signal = controller.signal;
+
+    const response = await w.fetch('data.json', { signal });
+    const reader = response.body.getReader();
+
+    controller.abort();
+
+    await promise_rejects_dom(t, "AbortError", w.DOMException, reader.read());
+    await promise_rejects_dom(t, "AbortError", w.DOMException, reader.closed);
+  }, "Stream errors once aborted.");
+
+  promise_test(async t => {
+    const scope = SCOPE + "?q=aborted-with-abort-reason";
+    await setupRegistration(t, scope, '../resources/sw-intercept.js');
+    const iframe = await with_iframe(scope);
+    add_completion_callback(_ => iframe.remove());
+    const w = iframe.contentWindow;
+
+    const controller = new w.AbortController();
+    const signal = controller.signal;
+
+    const fetchPromise = w.fetch('data.json', { signal });
+
+    controller.abort(error1);
+
+    await promise_rejects_exactly(t, error1, fetchPromise);
+  }, "fetch() rejects with abort reason");
+
+
+  promise_test(async t => {
+    const scope = SCOPE + "?q=aborted-with-abort-reason-in-body";
+    await setupRegistration(t, scope, '../resources/sw-intercept.js');
+    const iframe = await with_iframe(scope);
+    add_completion_callback(_ => iframe.remove());
+    const w = iframe.contentWindow;
+
+    const controller = new w.AbortController();
+    const signal = controller.signal;
+
+    const fetchResponse = await w.fetch('data.json', { signal });
+    const bodyPromise  = fetchResponse.body.getReader().read();
+    controller.abort(error1);
+
+    await promise_rejects_exactly(t, error1, bodyPromise);
+    }, "fetch() response body has abort reason");
+
+  promise_test(async t => {
+    const scope = SCOPE + "?q=service-worker-observes-abort-reason";
+    await setupRegistration(t, scope, '../resources/sw-intercept-abort.js');
+    const iframe = await with_iframe(scope);
+    add_completion_callback(_ => iframe.remove());
+    const w = iframe.contentWindow;
+
+    const controller = new w.AbortController();
+    const signal = controller.signal;
+
+    const fetchPromise = w.fetch('data.json', { signal });
+
+    await new Promise(resolve => {
+      w.navigator.serviceWorker.addEventListener('message', t.step_func(event => {
+        assert_equals(event.data, "fetch event has arrived");
+        resolve();
+      }), {once: true});
+    });
+
+    controller.abort(error1);
+
+    await new Promise(resolve => {
+      w.navigator.serviceWorker.addEventListener('message', t.step_func(event => {
+        assert_equals(event.data.message, error1.message);
+        resolve();
+      }), {once: true});
+    });
+
+    await promise_rejects_exactly(t, error1, fetchPromise);
+  }, "Service Worker can observe the fetch abort and associated abort reason");
+
+  promise_test(async t => {
+    let incrementing_error = new Error('error1');
+    incrementing_error.name = 'error1';
+
+    const scope = SCOPE + "?q=serialization-on-abort";
+    await setupRegistration(t, scope, '../resources/sw-intercept-abort.js');
+    const iframe = await with_iframe(scope);
+    add_completion_callback(_ => iframe.remove());
+    const w = iframe.contentWindow;
+
+    const controller = new w.AbortController();
+    const signal = controller.signal;
+
+    const fetchPromise = w.fetch('data.json', { signal });
+
+    await new Promise(resolve => {
+      w.navigator.serviceWorker.addEventListener('message', t.step_func(event => {
+        assert_equals(event.data, "fetch event has arrived");
+        resolve();
+      }), {once: true});
+    });
+
+    controller.abort(incrementing_error);
+
+    const original_error_name = incrementing_error.name;
+
+    incrementing_error.name = 'error2';
+
+    await new Promise(resolve => {
+      w.navigator.serviceWorker.addEventListener('message', t.step_func(event => {
+        assert_equals(event.data.name, original_error_name);
+        resolve();
+      }), {once: true});
+    });
+
+    await promise_rejects_exactly(t, incrementing_error, fetchPromise);
+  }, "Abort reason serialization happens on abort");
+</script>
+</body>
+</html>
diff --git a/test/wpt/tests/fetch/api/basic/block-mime-as-script.html b/test/wpt/tests/fetch/api/basic/block-mime-as-script.html
new file mode 100644
index 00000000000..afc2bbbafb0
--- /dev/null
+++ b/test/wpt/tests/fetch/api/basic/block-mime-as-script.html
@@ -0,0 +1,43 @@
+<!doctype html>
+<meta charset="utf-8">
+<title>Block mime type as script</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<div></div>
+<script>
+  var noop = function() {};
+
+  ["non-empty", "empty"].forEach(function(content) {
+    ["text/csv",
+     "audio/aiff",
+     "audio/midi",
+     "audio/whatever",
+     "video/avi",
+     "video/fli",
+     "video/whatever",
+     "image/jpeg",
+     "image/gif",
+     "image/whatever"].forEach(function(test_case) {
+      async_test(function(t) {
+        var script = document.createElement("script");
+        script.onerror = t.step_func_done(noop);
+        script.onload = t.unreached_func("Unexpected load event");
+        script.src = "../resources/script-with-header.py?content=" + content +
+                     "&mime=" + test_case;
+        document.body.appendChild(script);
+      }, "Should fail loading " + content + " script with " + test_case +
+         " MIME type");
+    });
+  });
+
+  ["html", "plain"].forEach(function(test_case) {
+    async_test(function(t) {
+      var script = document.createElement("script");
+      script.onerror = t.unreached_func("Unexpected error event");
+      script.onload = t.step_func_done(noop);
+      script.src = "../resources/script-with-header.py?mime=text/" + test_case;
+      document.body.appendChild(script);
+    }, "Should load script with text/" + test_case + " MIME type");
+  });
+
+</script>
diff --git a/test/wpt/tests/fetch/api/basic/conditional-get.any.js b/test/wpt/tests/fetch/api/basic/conditional-get.any.js
new file mode 100644
index 00000000000..2f9fa81c02b
--- /dev/null
+++ b/test/wpt/tests/fetch/api/basic/conditional-get.any.js
@@ -0,0 +1,38 @@
+// META: title=Request ETag
+// META: global=window,worker
+// META: script=/common/utils.js
+
+promise_test(function() {
+  var cacheBuster = token(); // ensures first request is uncached
+  var url = "../resources/cache.py?v=" + cacheBuster;
+  var etag;
+
+  // make the first request
+  return fetch(url).then(function(response) {
+    // ensure we're getting the regular, uncached response
+    assert_equals(response.status, 200);
+    assert_equals(response.headers.get("X-HTTP-STATUS"), null)
+
+    return response.text(); // consuming the body, just to be safe
+  }).then(function(body) {
+    // make a second request
+    return fetch(url);
+  }).then(function(response) {
+    // while the server responds with 304 if our browser sent the correct
+    // If-None-Match request header, at the JavaScript level this surfaces
+    // as 200
+    assert_equals(response.status, 200);
+    assert_equals(response.headers.get("X-HTTP-STATUS"), "304")
+
+    etag = response.headers.get("ETag")
+
+    return response.text(); // consuming the body, just to be safe
+  }).then(function(body) {
+    // make a third request, explicitly setting If-None-Match request header
+    var headers = { "If-None-Match": etag }
+    return fetch(url, { headers: headers })
+  }).then(function(response) {
+    // 304 now surfaces thanks to the explicit If-None-Match request header
+    assert_equals(response.status, 304);
+  });
+}, "Testing conditional GET with ETags");
diff --git a/test/wpt/tests/fetch/api/basic/keepalive.html b/test/wpt/tests/fetch/api/basic/keepalive.html
new file mode 100644
index 00000000000..36d156bba43
--- /dev/null
+++ b/test/wpt/tests/fetch/api/basic/keepalive.html
@@ -0,0 +1,106 @@
+<!doctype html>
+<html>
+<meta charset="utf-8">
+<title>Fetch API: keepalive handling</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/common/get-host-info.sub.js"></script>
+<body>
+<script>
+
+const {
+  HTTP_NOTSAMESITE_ORIGIN,
+  HTTP_REMOTE_ORIGIN,
+  HTTP_REMOTE_ORIGIN_WITH_DIFFERENT_PORT
+} = get_host_info();
+
+function getUrl(origin1, origin2, withHeaders) {
+  const frameOrigin = HTTP_NOTSAMESITE_ORIGIN;
+  return `${frameOrigin}/fetch/api/resources/keepalive-iframe.html?` +
+    `origin1=${origin1}&` +
+    `origin2=${origin2}&` +
+    (withHeaders ? `with-headers` : ``);
+}
+
+async function getToken() {
+  return new Promise((resolve) => {
+    window.addEventListener('message', (event) => {
+      resolve(event.data);
+    }, {once: true});
+  });
+}
+
+async function queryToken(token) {
+  const response = await fetch(`../resources/stash-take.py?key=${token}`);
+  const json = await response.json();
+  return json;
+}
+
+// In order to parallelize the work, we are going to have an async_test
+// for the rest of the work. Note that we want the serialized behavior
+// for the steps so far, so we don't want to make the entire test case
+// an async_test.
+function checkToken(testName, token) {
+  async_test((test) => {
+    new Promise((resolve) => test.step_timeout(resolve, 3000)).then(() => {
+      return queryToken(token);
+    }).then((result) => {
+      assert_equals(result, 'on');
+    }).then(() => {
+      test.done();
+    }).catch(test.step_func((e) => {
+      assert_unreached(e);
+    }));
+  }, testName);
+}
+
+promise_test(async (test) => {
+  const iframe = document.createElement('iframe');
+  iframe.src = getUrl('', '', false);
+  document.body.appendChild(iframe);
+  const tokenPromise = getToken();
+  await (new Promise((resolve) => iframe.addEventListener('load', resolve)));
+  const token = await tokenPromise;
+  iframe.remove();
+
+  checkToken('same-origin', token);
+}, 'same-origin; setting up');
+
+promise_test(async (test) => {
+  const iframe = document.createElement('iframe');
+  iframe.src = getUrl(HTTP_REMOTE_ORIGIN,
+                      HTTP_REMOTE_ORIGIN_WITH_DIFFERENT_PORT, false);
+  document.body.appendChild(iframe);
+  const tokenPromise = getToken();
+  await (new Promise((resolve) => iframe.addEventListener('load', resolve)));
+  const token = await tokenPromise;
+  iframe.remove();
+
+  checkToken('cross-origin redirect', token);
+}, 'cross-origin redirect; setting up');
+
+promise_test(async (test) => {
+  const iframe = document.createElement('iframe');
+  iframe.src = getUrl(HTTP_REMOTE_ORIGIN,
+                      HTTP_REMOTE_ORIGIN_WITH_DIFFERENT_PORT, true);
+  document.body.appendChild(iframe);
+  const tokenPromise = getToken();
+  await (new Promise((resolve) => iframe.addEventListener('load', resolve)));
+  const token = await tokenPromise;
+  iframe.remove();
+
+  checkToken('cross-origin redirect with preflight', token);
+}, 'cross-origin redirect with preflight; setting up');
+
+promise_test(async (test) => {
+  const w = window.open(
+    `${HTTP_NOTSAMESITE_ORIGIN}/fetch/api/resources/keepalive-window.html`);
+  const tokenPromise = getToken();
+  const token = await tokenPromise;
+  w.close();
+
+  checkToken('keepalive in onunload in nested frame in another window', token);
+}, 'keepalive in onunload in nested frame in another window; setting up');
+</script>
+</body>
+</html>
diff --git a/test/wpt/tests/fetch/api/basic/mediasource.window.js b/test/wpt/tests/fetch/api/basic/mediasource.window.js
new file mode 100644
index 00000000000..1f89595393d
--- /dev/null
+++ b/test/wpt/tests/fetch/api/basic/mediasource.window.js
@@ -0,0 +1,5 @@
+promise_test(t => {
+  const mediaSource = new MediaSource(),
+        mediaSourceURL = URL.createObjectURL(mediaSource);
+  return promise_rejects_js(t, TypeError, fetch(mediaSourceURL));
+}, "Cannot fetch blob: URL from a MediaSource");
diff --git a/test/wpt/tests/fetch/api/basic/mode-no-cors.sub.any.js b/test/wpt/tests/fetch/api/basic/mode-no-cors.sub.any.js
new file mode 100644
index 00000000000..a4abcac55f3
--- /dev/null
+++ b/test/wpt/tests/fetch/api/basic/mode-no-cors.sub.any.js
@@ -0,0 +1,29 @@
+// META: script=../resources/utils.js
+
+function fetchNoCors(url, isOpaqueFiltered) {
+  var urlQuery = "?pipe=header(x-is-filtered,value)"
+  promise_test(function(test) {
+    if (isOpaqueFiltered)
+      return fetch(url + urlQuery, {"mode": "no-cors"}).then(function(resp) {
+        assert_equals(resp.status, 0, "Opaque filter: status is 0");
+        assert_equals(resp.statusText, "", "Opaque filter: statusText is \"\"");
+        assert_equals(resp.url, "", "Opaque filter: url is \"\"");
+        assert_equals(resp.type , "opaque", "Opaque filter: response's type is opaque");
+        assert_equals(resp.headers.get("x-is-filtered"), null, "Header x-is-filtered is filtered");
+      });
+    else
+      return fetch(url + urlQuery, {"mode": "no-cors"}).then(function(resp) {
+        assert_equals(resp.status, 200, "HTTP status is 200");
+        assert_equals(resp.type , "basic", "Response's type is basic");
+        assert_equals(resp.headers.get("x-is-filtered"), "value", "Header x-is-filtered is not filtered");
+      });
+  }, "Fetch "+ url + " with no-cors mode");
+}
+
+fetchNoCors(RESOURCES_DIR + "top.txt", false);
+fetchNoCors("http://{{host}}:{{ports[http][0]}}/fetch/api/resources/top.txt", false);
+fetchNoCors("https://{{host}}:{{ports[https][0]}}/fetch/api/resources/top.txt", true);
+fetchNoCors("http://{{host}}:{{ports[http][1]}}/fetch/api/resources/top.txt", true);
+
+done();
+
diff --git a/test/wpt/tests/fetch/api/basic/mode-same-origin.any.js b/test/wpt/tests/fetch/api/basic/mode-same-origin.any.js
new file mode 100644
index 00000000000..1457702f1b1
--- /dev/null
+++ b/test/wpt/tests/fetch/api/basic/mode-same-origin.any.js
@@ -0,0 +1,28 @@
+// META: script=../resources/utils.js
+// META: script=/common/get-host-info.sub.js
+
+function fetchSameOrigin(url, shouldPass) {
+  promise_test(function(test) {
+    if (shouldPass)
+      return fetch(url , {"mode": "same-origin"}).then(function(resp) {
+        assert_equals(resp.status, 200, "HTTP status is 200");
+        assert_equals(resp.type, "basic", "response type is basic");
+      });
+    else
+      return promise_rejects_js(test, TypeError, fetch(url, {mode: "same-origin"}));
+  }, "Fetch "+ url + " with same-origin mode");
+}
+
+var host_info = get_host_info();
+
+fetchSameOrigin(RESOURCES_DIR + "top.txt", true);
+fetchSameOrigin(host_info.HTTP_ORIGIN + "/fetch/api/resources/top.txt", true);
+fetchSameOrigin(host_info.HTTPS_ORIGIN + "/fetch/api/resources/top.txt", false);
+fetchSameOrigin(host_info.HTTP_REMOTE_ORIGIN + "/fetch/api/resources/top.txt", false);
+
+var redirPath = dirname(location.pathname) + RESOURCES_DIR + "redirect.py?location=";
+
+fetchSameOrigin(redirPath + RESOURCES_DIR + "top.txt", true);
+fetchSameOrigin(redirPath + host_info.HTTP_ORIGIN + "/fetch/api/resources/top.txt", true);
+fetchSameOrigin(redirPath + host_info.HTTPS_ORIGIN + "/fetch/api/resources/top.txt", false);
+fetchSameOrigin(redirPath + host_info.HTTP_REMOTE_ORIGIN + "/fetch/api/resources/top.txt", false);
diff --git a/test/wpt/tests/fetch/api/basic/referrer.any.js b/test/wpt/tests/fetch/api/basic/referrer.any.js
new file mode 100644
index 00000000000..85745e692a2
--- /dev/null
+++ b/test/wpt/tests/fetch/api/basic/referrer.any.js
@@ -0,0 +1,29 @@
+// META: script=../resources/utils.js
+// META: script=/common/get-host-info.sub.js
+
+function runTest(url, init, expectedReferrer, title) {
+    promise_test(function(test) {
+        url += (url.indexOf('?') !== -1 ? '&' : '?') + "headers=referer&cors";
+
+        return fetch(url , init).then(function(resp) {
+            assert_equals(resp.status, 200, "HTTP status is 200");
+            assert_equals(resp.headers.get("x-request-referer"), expectedReferrer, "Request's referrer is correct");
+        });
+    }, title);
+}
+
+var fetchedUrl = RESOURCES_DIR + "inspect-headers.py";
+var corsFetchedUrl = get_host_info().HTTP_REMOTE_ORIGIN  + dirname(location.pathname) + RESOURCES_DIR + "inspect-headers.py";
+var redirectUrl = RESOURCES_DIR + "redirect.py?location=" ;
+var corsRedirectUrl = get_host_info().HTTP_REMOTE_ORIGIN + dirname(location.pathname) + RESOURCES_DIR + "redirect.py?location=";
+
+runTest(fetchedUrl, { referrerPolicy: "origin-when-cross-origin"}, location.toString(), "origin-when-cross-origin policy on a same-origin URL");
+runTest(corsFetchedUrl, { referrerPolicy: "origin-when-cross-origin"}, get_host_info().HTTP_ORIGIN + "/", "origin-when-cross-origin policy on a cross-origin URL");
+runTest(redirectUrl + corsFetchedUrl, { referrerPolicy: "origin-when-cross-origin"}, get_host_info().HTTP_ORIGIN + "/", "origin-when-cross-origin policy on a cross-origin URL after same-origin redirection");
+runTest(corsRedirectUrl + fetchedUrl, { referrerPolicy: "origin-when-cross-origin"}, get_host_info().HTTP_ORIGIN + "/", "origin-when-cross-origin policy on a same-origin URL after cross-origin redirection");
+
+
+var referrerUrlWithCredentials = get_host_info().HTTP_ORIGIN.replace("http://", "http://username:password@");
+runTest(fetchedUrl, {referrer: referrerUrlWithCredentials}, get_host_info().HTTP_ORIGIN + "/", "Referrer with credentials should be stripped");
+var referrerUrlWithFragmentIdentifier = get_host_info().HTTP_ORIGIN + "#fragmentIdentifier";
+runTest(fetchedUrl, {referrer: referrerUrlWithFragmentIdentifier}, get_host_info().HTTP_ORIGIN + "/", "Referrer with fragment ID should be stripped");
diff --git a/test/wpt/tests/fetch/api/basic/request-forbidden-headers.any.js b/test/wpt/tests/fetch/api/basic/request-forbidden-headers.any.js
new file mode 100644
index 00000000000..511ce601e7c
--- /dev/null
+++ b/test/wpt/tests/fetch/api/basic/request-forbidden-headers.any.js
@@ -0,0 +1,100 @@
+// META: global=window,worker
+// META: script=../resources/utils.js
+
+function requestForbiddenHeaders(desc, forbiddenHeaders) {
+  var url = RESOURCES_DIR + "inspect-headers.py";
+  var requestInit = {"headers": forbiddenHeaders}
+  var urlParameters = "?headers=" + Object.keys(forbiddenHeaders).join("|");
+
+  promise_test(function(test){
+    return fetch(url + urlParameters, requestInit).then(function(resp) {
+      assert_equals(resp.status, 200, "HTTP status is 200");
+      assert_equals(resp.type , "basic", "Response's type is basic");
+      for (var header in forbiddenHeaders)
+        assert_not_equals(resp.headers.get("x-request-" + header), forbiddenHeaders[header], header + " does not have the value we defined");
+    });
+  }, desc);
+}
+
+function requestValidOverrideHeaders(desc, validHeaders) {
+  var url = RESOURCES_DIR + "inspect-headers.py";
+  var requestInit = {"headers": validHeaders}
+  var urlParameters = "?headers=" + Object.keys(validHeaders).join("|");
+
+  promise_test(function(test){
+    return fetch(url + urlParameters, requestInit).then(function(resp) {
+      assert_equals(resp.status, 200, "HTTP status is 200");
+      assert_equals(resp.type , "basic", "Response's type is basic");
+      for (var header in validHeaders)
+        assert_equals(resp.headers.get("x-request-" + header), validHeaders[header], header + "is not skipped for non-forbidden methods");
+    });
+  }, desc);
+}
+
+requestForbiddenHeaders("Accept-Charset is a forbidden request header", {"Accept-Charset": "utf-8"});
+requestForbiddenHeaders("Accept-Encoding is a forbidden request header", {"Accept-Encoding": ""});
+
+requestForbiddenHeaders("Access-Control-Request-Headers is a forbidden request header", {"Access-Control-Request-Headers": ""});
+requestForbiddenHeaders("Access-Control-Request-Method is a forbidden request header", {"Access-Control-Request-Method": ""});
+requestForbiddenHeaders(
+    'Access-Control-Request-Private-Network is a forbidden request header',
+    {'Access-Control-Request-Private-Network': ''});
+requestForbiddenHeaders("Connection is a forbidden request header", {"Connection": "close"});
+requestForbiddenHeaders("Content-Length is a forbidden request header", {"Content-Length": "42"});
+requestForbiddenHeaders("Cookie is a forbidden request header", {"Cookie": "cookie=none"});
+requestForbiddenHeaders("Cookie2 is a forbidden request header", {"Cookie2": "cookie2=none"});
+requestForbiddenHeaders("Date is a forbidden request header", {"Date": "Wed, 04 May 1988 22:22:22 GMT"});
+requestForbiddenHeaders("DNT is a forbidden request header", {"DNT": "4"});
+requestForbiddenHeaders("Expect is a forbidden request header", {"Expect": "100-continue"});
+requestForbiddenHeaders("Host is a forbidden request header", {"Host": "http://wrong-host.com"});
+requestForbiddenHeaders("Keep-Alive is a forbidden request header", {"Keep-Alive": "timeout=15"});
+requestForbiddenHeaders("Origin is a forbidden request header", {"Origin": "http://wrong-origin.com"});
+requestForbiddenHeaders("Referer is a forbidden request header", {"Referer": "http://wrong-referer.com"});
+requestForbiddenHeaders("TE is a forbidden request header", {"TE": "trailers"});
+requestForbiddenHeaders("Trailer is a forbidden request header", {"Trailer": "Accept"});
+requestForbiddenHeaders("Transfer-Encoding is a forbidden request header", {"Transfer-Encoding": "chunked"});
+requestForbiddenHeaders("Upgrade is a forbidden request header", {"Upgrade": "HTTP/2.0"});
+requestForbiddenHeaders("Via is a forbidden request header", {"Via": "1.1 nowhere.com"});
+requestForbiddenHeaders("Proxy- is a forbidden request header", {"Proxy-": "value"});
+requestForbiddenHeaders("Proxy-Test is a forbidden request header", {"Proxy-Test": "value"});
+requestForbiddenHeaders("Sec- is a forbidden request header", {"Sec-": "value"});
+requestForbiddenHeaders("Sec-Test is a forbidden request header", {"Sec-Test": "value"});
+
+let forbiddenMethods = [
+  "TRACE",
+  "TRACK",
+  "CONNECT",
+  "trace",
+  "track",
+  "connect",
+  "trace,",
+  "GET,track ",
+  " connect",
+];
+
+let overrideHeaders = [
+  "x-http-method-override",
+  "x-http-method",
+  "x-method-override",
+  "X-HTTP-METHOD-OVERRIDE",
+  "X-HTTP-METHOD",
+  "X-METHOD-OVERRIDE",
+];
+
+for (forbiddenMethod of forbiddenMethods) {
+    for (overrideHeader of overrideHeaders) {
+       requestForbiddenHeaders(`header ${overrideHeader} is forbidden to use value ${forbiddenMethod}`, {[overrideHeader]: forbiddenMethod});
+    }
+}
+
+let permittedValues = [
+  "GETTRACE",
+  "GET",
+  "\",TRACE\",",
+];
+
+for (permittedValue of permittedValues) {
+    for (overrideHeader of overrideHeaders) {
+       requestValidOverrideHeaders(`header ${overrideHeader} is allowed to use value ${permittedValue}`, {[overrideHeader]: permittedValue});
+    }
+}
diff --git a/test/wpt/tests/fetch/api/basic/request-headers.any.js b/test/wpt/tests/fetch/api/basic/request-headers.any.js
new file mode 100644
index 00000000000..ac54256e4c6
--- /dev/null
+++ b/test/wpt/tests/fetch/api/basic/request-headers.any.js
@@ -0,0 +1,82 @@
+// META: global=window,worker
+// META: script=../resources/utils.js
+
+function checkContentType(contentType, body)
+{
+    if (self.FormData && body instanceof self.FormData) {
+        assert_true(contentType.startsWith("multipart/form-data; boundary="), "Request should have header content-type starting with multipart/form-data; boundary=, but got " + contentType);
+        return;
+    }
+
+    var expectedContentType = "text/plain;charset=UTF-8";
+    if(body === null || body instanceof ArrayBuffer || body.buffer instanceof ArrayBuffer)
+        expectedContentType = null;
+    else if (body instanceof Blob)
+        expectedContentType = body.type ? body.type : null;
+    else if (body instanceof URLSearchParams)
+        expectedContentType = "application/x-www-form-urlencoded;charset=UTF-8";
+
+    assert_equals(contentType , expectedContentType, "Request should have header content-type: " + expectedContentType);
+}
+
+function requestHeaders(desc, url, method, body, expectedOrigin, expectedContentLength) {
+  var urlParameters = "?headers=origin|user-agent|accept-charset|content-length|content-type";
+  var requestInit = {"method": method}
+  promise_test(function(test){
+    if (typeof body === "function")
+      body = body();
+    if (body)
+      requestInit["body"] = body;
+    return fetch(url + urlParameters, requestInit).then(function(resp) {
+      assert_equals(resp.status, 200, "HTTP status is 200");
+      assert_equals(resp.type , "basic", "Response's type is basic");
+      assert_true(resp.headers.has("x-request-user-agent"), "Request has header user-agent");
+      assert_false(resp.headers.has("accept-charset"), "Request has header accept-charset");
+      assert_equals(resp.headers.get("x-request-origin") , expectedOrigin, "Request should have header origin: " + expectedOrigin);
+      if (expectedContentLength !== undefined)
+        assert_equals(resp.headers.get("x-request-content-length") , expectedContentLength, "Request should have header content-length: " + expectedContentLength);
+      checkContentType(resp.headers.get("x-request-content-type"), body);
+    });
+  }, desc);
+}
+
+var url = RESOURCES_DIR + "inspect-headers.py"
+
+requestHeaders("Fetch with GET", url, "GET", null, null, null);
+requestHeaders("Fetch with HEAD", url, "HEAD", null, null, null);
+requestHeaders("Fetch with PUT without body", url, "POST", null, location.origin, "0");
+requestHeaders("Fetch with PUT with body", url, "PUT", "Request's body", location.origin, "14");
+requestHeaders("Fetch with POST without body", url, "POST", null, location.origin, "0");
+requestHeaders("Fetch with POST with text body", url, "POST", "Request's body", location.origin, "14");
+requestHeaders("Fetch with POST with FormData body", url, "POST", function() { return new FormData(); }, location.origin);
+requestHeaders("Fetch with POST with URLSearchParams body", url, "POST", function() { return new URLSearchParams("name=value"); }, location.origin, "10");
+requestHeaders("Fetch with POST with Blob body", url, "POST", new Blob(["Test"]), location.origin, "4");
+requestHeaders("Fetch with POST with ArrayBuffer body", url, "POST", new ArrayBuffer(4), location.origin, "4");
+requestHeaders("Fetch with POST with Uint8Array body", url, "POST", new Uint8Array(4), location.origin, "4");
+requestHeaders("Fetch with POST with Int8Array body", url, "POST", new Int8Array(4), location.origin, "4");
+requestHeaders("Fetch with POST with Float32Array body", url, "POST", new Float32Array(1), location.origin, "4");
+requestHeaders("Fetch with POST with Float64Array body", url, "POST", new Float64Array(1), location.origin, "8");
+requestHeaders("Fetch with POST with DataView body", url, "POST", new DataView(new ArrayBuffer(8), 0, 4), location.origin, "4");
+requestHeaders("Fetch with POST with Blob body with mime type", url, "POST", new Blob(["Test"], { type: "text/maybe" }), location.origin, "4");
+requestHeaders("Fetch with Chicken", url, "Chicken", null, location.origin, null);
+requestHeaders("Fetch with Chicken with body", url, "Chicken", "Request's body", location.origin, "14");
+
+function requestOriginHeader(method, mode, needsOrigin) {
+  promise_test(function(test){
+    return fetch(url + "?headers=origin", {method:method, mode:mode}).then(function(resp) {
+      assert_equals(resp.status, 200, "HTTP status is 200");
+      assert_equals(resp.type , "basic", "Response's type is basic");
+      if(needsOrigin)
+        assert_equals(resp.headers.get("x-request-origin") , location.origin, "Request should have an Origin header with origin: " + location.origin);
+      else
+        assert_equals(resp.headers.get("x-request-origin"), null, "Request should not have an Origin header")
+    });
+  }, "Fetch with " + method + " and mode \"" + mode + "\" " + (needsOrigin ? "needs" : "does not need") + " an Origin header");
+}
+
+requestOriginHeader("GET", "cors", false);
+requestOriginHeader("POST", "same-origin", true);
+requestOriginHeader("POST", "no-cors", true);
+requestOriginHeader("PUT", "same-origin", true);
+requestOriginHeader("TacO", "same-origin", true);
+requestOriginHeader("TacO", "cors", true);
diff --git a/test/wpt/tests/fetch/api/basic/request-referrer-redirected-worker.html b/test/wpt/tests/fetch/api/basic/request-referrer-redirected-worker.html
new file mode 100644
index 00000000000..bdea1e18531
--- /dev/null
+++ b/test/wpt/tests/fetch/api/basic/request-referrer-redirected-worker.html
@@ -0,0 +1,17 @@
+<!doctype html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>Fetch in worker: referrer header</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+  </head>
+  <body>
+    <script>
+      let finalURL = "/fetch/api/basic/request-referrer.any.worker.js";
+      let url = "/fetch/api/resources/redirect.py?location=" +
+                encodeURIComponent(finalURL);
+      fetch_tests_from_worker(new Worker(url));
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/fetch/api/basic/request-referrer.any.js b/test/wpt/tests/fetch/api/basic/request-referrer.any.js
new file mode 100644
index 00000000000..0c3357642d6
--- /dev/null
+++ b/test/wpt/tests/fetch/api/basic/request-referrer.any.js
@@ -0,0 +1,24 @@
+// META: global=window,worker
+// META: script=../resources/utils.js
+
+function testReferrer(referrer, expected, desc) {
+  promise_test(function(test) {
+    var url = RESOURCES_DIR + "inspect-headers.py?headers=referer"
+    var req = new Request(url, { referrer: referrer });
+    return fetch(req).then(function(resp) {
+      var actual = resp.headers.get("x-request-referer");
+      if (expected) {
+        assert_equals(actual, expected, "request's referer should be: " + expected);
+        return;
+      }
+      if (actual) {
+        assert_equals(actual, "", "request's referer should be empty");
+      }
+    });
+  }, desc);
+}
+
+testReferrer("about:client", self.location.href, 'about:client referrer');
+
+var fooURL = new URL("./foo", self.location).href;
+testReferrer(fooURL, fooURL, 'url referrer');
diff --git a/test/wpt/tests/fetch/api/basic/request-upload.h2.any.js b/test/wpt/tests/fetch/api/basic/request-upload.h2.any.js
new file mode 100644
index 00000000000..eedc2bf6a76
--- /dev/null
+++ b/test/wpt/tests/fetch/api/basic/request-upload.h2.any.js
@@ -0,0 +1,186 @@
+// META: global=window,worker
+// META: script=../resources/utils.js
+// META: script=/common/utils.js
+// META: script=/common/get-host-info.sub.js
+
+const duplex = "half";
+
+async function assertUpload(url, method, createBody, expectedBody) {
+  const requestInit = {method};
+  const body = createBody();
+  if (body) {
+    requestInit["body"] = body;
+    requestInit.duplex = "half";
+  }
+  const resp = await fetch(url, requestInit);
+  const text = await resp.text();
+  assert_equals(text, expectedBody);
+}
+
+function testUpload(desc, url, method, createBody, expectedBody) {
+  promise_test(async () => {
+    await assertUpload(url, method, createBody, expectedBody);
+  }, desc);
+}
+
+function createStream(chunks) {
+  return new ReadableStream({
+    start: (controller) => {
+      for (const chunk of chunks) {
+        controller.enqueue(chunk);
+      }
+      controller.close();
+    }
+  });
+}
+
+const url = RESOURCES_DIR + "echo-content.h2.py"
+
+testUpload("Fetch with POST with empty ReadableStream", url,
+  "POST",
+  () => {
+    return new ReadableStream({start: controller => {
+      controller.close();
+    }})
+  },
+  "");
+
+testUpload("Fetch with POST with ReadableStream", url,
+  "POST",
+  () => {
+    return new ReadableStream({start: controller => {
+      const encoder = new TextEncoder();
+      controller.enqueue(encoder.encode("Test"));
+      controller.close();
+    }})
+  },
+  "Test");
+
+promise_test(async (test) => {
+  const body = new ReadableStream({start: controller => {
+    const encoder = new TextEncoder();
+    controller.enqueue(encoder.encode("Test"));
+    controller.close();
+  }});
+  const resp = await fetch(
+    "/fetch/connection-pool/resources/network-partition-key.py?"
+    + `status=421&uuid=${token()}&partition_id=${self.origin}`
+    + `&dispatch=check_partition&addcounter=true`,
+    {method: "POST", body: body, duplex});
+  assert_equals(resp.status, 421);
+  const text = await resp.text();
+  assert_equals(text, "ok. Request was sent 1 times. 1 connections were created.");
+}, "Fetch with POST with ReadableStream on 421 response should return the response and not retry.");
+
+promise_test(async (test) => {
+  const request = new Request('', {
+    body: new ReadableStream(),
+    method: 'POST',
+    duplex,
+  });
+
+  assert_equals(request.headers.get('Content-Type'), null, `Request should not have a content-type set`);
+
+  const response = await fetch('data:a/a;charset=utf-8,test', {
+    method: 'POST',
+    body: new ReadableStream(),
+    duplex,
+  });
+
+  assert_equals(await response.text(), 'test', `Response has correct body`);
+}, "Feature detect for POST with ReadableStream");
+
+promise_test(async (test) => {
+  const request = new Request('data:a/a;charset=utf-8,test', {
+    body: new ReadableStream(),
+    method: 'POST',
+    duplex,
+ });
+
+  assert_equals(request.headers.get('Content-Type'), null, `Request should not have a content-type set`);
+  const response = await fetch(request);
+  assert_equals(await response.text(), 'test', `Response has correct body`);
+}, "Feature detect for POST with ReadableStream, using request object");
+
+test(() => {
+  let duplexAccessed = false;
+
+  const request = new Request("", {
+    body: new ReadableStream(),
+    method: "POST",
+    get duplex() {
+      duplexAccessed = true;
+      return "half";
+    },
+  });
+
+  assert_equals(
+    request.headers.get("Content-Type"),
+    null,
+    `Request should not have a content-type set`
+  );
+  assert_true(duplexAccessed, `duplex dictionary property should be accessed`);
+}, "Synchronous feature detect");
+
+// The asserts the synchronousFeatureDetect isn't broken by a partial implementation.
+// An earlier feature detect was broken by Safari implementing streaming bodies as part of Request,
+// but it failed when passed to fetch().
+// This tests ensures that UAs must not implement RequestInit.duplex and streaming request bodies without also implementing the fetch() parts.
+promise_test(async () => {
+  let duplexAccessed = false;
+
+  const request = new Request("", {
+    body: new ReadableStream(),
+    method: "POST",
+    get duplex() {
+      duplexAccessed = true;
+      return "half";
+    },
+  });
+
+  const supported =
+    request.headers.get("Content-Type") === null && duplexAccessed;
+
+  // If the feature detect fails, assume the browser is being truthful (other tests pick up broken cases here)
+  if (!supported) return false;
+
+  await assertUpload(
+    url,
+    "POST",
+    () =>
+      new ReadableStream({
+        start: (controller) => {
+          const encoder = new TextEncoder();
+          controller.enqueue(encoder.encode("Test"));
+          controller.close();
+        },
+      }),
+    "Test"
+  );
+}, "Synchronous feature detect fails if feature unsupported");
+
+promise_test(async (t) => {
+  const body = createStream(["hello"]);
+  const method = "POST";
+  await promise_rejects_js(t, TypeError, fetch(url, { method, body, duplex }));
+}, "Streaming upload with body containing a String");
+
+promise_test(async (t) => {
+  const body = createStream([null]);
+  const method = "POST";
+  await promise_rejects_js(t, TypeError, fetch(url, { method, body, duplex }));
+}, "Streaming upload with body containing null");
+
+promise_test(async (t) => {
+  const body = createStream([33]);
+  const method = "POST";
+  await promise_rejects_js(t, TypeError, fetch(url, { method, body, duplex }));
+}, "Streaming upload with body containing a number");
+
+promise_test(async (t) => {
+  const url = "/fetch/api/resources/authentication.py?realm=test";
+  const body = createStream([]);
+  const method = "POST";
+  await promise_rejects_js(t, TypeError, fetch(url, { method, body, duplex }));
+}, "Streaming upload should fail on a 401 response");
+
diff --git a/test/wpt/tests/fetch/api/basic/status.h2.any.js b/test/wpt/tests/fetch/api/basic/status.h2.any.js
new file mode 100644
index 00000000000..99fec88f505
--- /dev/null
+++ b/test/wpt/tests/fetch/api/basic/status.h2.any.js
@@ -0,0 +1,17 @@
+// See also /xhr/status.h2.window.js
+
+[
+  200,
+  210,
+  400,
+  404,
+  410,
+  500,
+  502
+].forEach(status => {
+  promise_test(async t => {
+    const response = await fetch("/xhr/resources/status.py?code=" + status);
+    assert_equals(response.status, status, "status should be " + status);
+    assert_equals(response.statusText, "", "statusText should be the empty string");
+  }, "statusText over H2 for status " + status + " should be the empty string");
+});
diff --git a/test/wpt/tests/fetch/api/body/mime-type.any.js b/test/wpt/tests/fetch/api/body/mime-type.any.js
index 92440f0b511..a0f90a0abdf 100644
--- a/test/wpt/tests/fetch/api/body/mime-type.any.js
+++ b/test/wpt/tests/fetch/api/body/mime-type.any.js
@@ -37,4 +37,4 @@
     const blob = await bodyContainer.blob();
     assert_equals(blob.type, newMIMEType);
   }, `${bodyContainer.constructor.name}: setting missing Content-Type`);
-});
\ No newline at end of file
+});
diff --git a/test/wpt/tests/fetch/api/cors/cors-basic.any.js b/test/wpt/tests/fetch/api/cors/cors-basic.any.js
new file mode 100644
index 00000000000..23f5f91c87d
--- /dev/null
+++ b/test/wpt/tests/fetch/api/cors/cors-basic.any.js
@@ -0,0 +1,37 @@
+// META: script=../resources/utils.js
+// META: script=/common/get-host-info.sub.js
+
+function cors(desc, origin) {
+  var url = origin + dirname(location.pathname);
+  var urlParameters = "?pipe=header(Access-Control-Allow-Origin,*)";
+
+  promise_test(function(test) {
+    return fetch(url + RESOURCES_DIR + "top.txt" + urlParameters, {"mode": "no-cors"} ).then(function(resp) {
+      assert_equals(resp.status, 0, "Opaque filter: status is 0");
+      assert_equals(resp.statusText, "", "Opaque filter: statusText is \"\"");
+      assert_equals(resp.type , "opaque", "Opaque filter: response's type is opaque");
+      return resp.text().then(function(value) {
+        assert_equals(value, "", "Opaque response should have an empty body");
+      });
+    });
+  }, desc + " [no-cors mode]");
+
+  promise_test(function(test) {
+    return promise_rejects_js(test, TypeError, fetch(url + RESOURCES_DIR + "top.txt", {"mode": "cors"}));
+  }, desc + " [server forbid CORS]");
+
+  promise_test(function(test) {
+    return fetch(url + RESOURCES_DIR + "top.txt" + urlParameters, {"mode": "cors"} ).then(function(resp) {
+      assert_equals(resp.status, 200, "Fetch's response's status is 200");
+      assert_equals(resp.type , "cors", "CORS response's type is cors");
+    });
+  }, desc + " [cors mode]");
+}
+
+var host_info = get_host_info();
+
+cors("Same domain different port", host_info.HTTP_ORIGIN_WITH_DIFFERENT_PORT);
+cors("Same domain different protocol different port", host_info.HTTPS_ORIGIN);
+cors("Cross domain basic usage", host_info.HTTP_REMOTE_ORIGIN);
+cors("Cross domain different port", host_info.HTTP_REMOTE_ORIGIN_WITH_DIFFERENT_PORT);
+cors("Cross domain different protocol", host_info.HTTPS_REMOTE_ORIGIN);
diff --git a/test/wpt/tests/fetch/api/cors/cors-cookies-redirect.any.js b/test/wpt/tests/fetch/api/cors/cors-cookies-redirect.any.js
new file mode 100644
index 00000000000..f5217b42460
--- /dev/null
+++ b/test/wpt/tests/fetch/api/cors/cors-cookies-redirect.any.js
@@ -0,0 +1,49 @@
+// META: script=/common/utils.js
+// META: script=../resources/utils.js
+// META: script=/common/get-host-info.sub.js
+
+var redirectUrl = get_host_info().HTTP_REMOTE_ORIGIN + dirname(location.pathname) + RESOURCES_DIR + "redirect.py";
+var urlSetCookies1 = get_host_info().HTTP_REMOTE_ORIGIN + dirname(location.pathname) + RESOURCES_DIR + "top.txt";
+var urlSetCookies2 = get_host_info().HTTP_ORIGIN_WITH_DIFFERENT_PORT + dirname(location.pathname) + RESOURCES_DIR + "top.txt";
+var urlCheckCookies = get_host_info().HTTP_ORIGIN_WITH_DIFFERENT_PORT + dirname(location.pathname) + RESOURCES_DIR + "inspect-headers.py?cors&headers=cookie";
+
+var urlSetCookiesParameters = "?pipe=header(Access-Control-Allow-Origin," + location.origin + ")";
+urlSetCookiesParameters += "|header(Access-Control-Allow-Credentials,true)";
+
+urlSetCookiesParameters1 = urlSetCookiesParameters + "|header(Set-Cookie,a=1)";
+urlSetCookiesParameters2 = urlSetCookiesParameters + "|header(Set-Cookie,a=2)";
+
+urlClearCookiesParameters1 = urlSetCookiesParameters + "|header(Set-Cookie,a=1%3B%20max-age=0)";
+urlClearCookiesParameters2 = urlSetCookiesParameters + "|header(Set-Cookie,a=2%3B%20max-age=0)";
+
+promise_test(async (test) => {
+    await fetch(urlSetCookies1 + urlSetCookiesParameters1, {"credentials": "include", "mode": "cors"});
+    await fetch(urlSetCookies2 + urlSetCookiesParameters2, {"credentials": "include", "mode": "cors"});
+}, "Set cookies");
+
+function doTest(usePreflight) {
+    promise_test(async (test) => {
+        var url = redirectUrl;
+        var uuid_token = token();
+        var urlParameters = "?token=" + uuid_token + "&max_age=0";
+        urlParameters += "&redirect_status=301";
+        urlParameters += "&location=" + encodeURIComponent(urlCheckCookies);
+        urlParameters += "&allow_headers=a&headers=Cookie";
+        headers = [];
+        if (usePreflight)
+            headers.push(["a", "b"]);
+
+        var requestInit = {"credentials": "include", "mode": "cors", "headers": headers};
+        var response = await fetch(url + urlParameters, requestInit);
+
+        assert_equals(response.headers.get("x-request-cookie") , "a=2", "Request includes cookie(s)");
+    }, "Testing credentials after cross-origin redirection with CORS and " + (usePreflight ? "" : "no ") + "preflight");
+}
+
+doTest(false);
+doTest(true);
+
+promise_test(async (test) => {
+    await fetch(urlSetCookies1 + urlClearCookiesParameters1, {"credentials": "include", "mode": "cors"});
+    await fetch(urlSetCookies2 + urlClearCookiesParameters2, {"credentials": "include", "mode": "cors"});
+}, "Clean cookies");
diff --git a/test/wpt/tests/fetch/api/cors/cors-cookies.any.js b/test/wpt/tests/fetch/api/cors/cors-cookies.any.js
new file mode 100644
index 00000000000..8c666e4782f
--- /dev/null
+++ b/test/wpt/tests/fetch/api/cors/cors-cookies.any.js
@@ -0,0 +1,56 @@
+// META: script=../resources/utils.js
+// META: script=/common/get-host-info.sub.js
+
+function corsCookies(desc, baseURL1, baseURL2, credentialsMode, cookies) {
+  var urlSetCookie = baseURL1 + dirname(location.pathname) + RESOURCES_DIR + "top.txt";
+  var urlCheckCookies = baseURL2 + dirname(location.pathname) + RESOURCES_DIR + "inspect-headers.py?cors&headers=cookie";
+  //enable cors with credentials
+  var urlParameters = "?pipe=header(Access-Control-Allow-Origin," + location.origin + ")";
+  urlParameters += "|header(Access-Control-Allow-Credentials,true)";
+
+  var urlCleanParameters = "?pipe=header(Access-Control-Allow-Origin," + location.origin + ")";
+  urlCleanParameters += "|header(Access-Control-Allow-Credentials,true)";
+  if (cookies) {
+    urlParameters += "|header(Set-Cookie,";
+    urlParameters += cookies.join(",True)|header(Set-Cookie,") +  ",True)";
+    urlCleanParameters += "|header(Set-Cookie,";
+    urlCleanParameters +=  cookies.join("%3B%20max-age=0,True)|header(Set-Cookie,") +  "%3B%20max-age=0,True)";
+  }
+
+  var requestInit = {"credentials": credentialsMode, "mode": "cors"};
+
+  promise_test(function(test){
+    return fetch(urlSetCookie + urlParameters, requestInit).then(function(resp) {
+      assert_equals(resp.status, 200, "HTTP status is 200");
+      //check cookies sent
+      return fetch(urlCheckCookies, requestInit);
+    }).then(function(resp) {
+      assert_equals(resp.status, 200, "HTTP status is 200");
+      assert_false(resp.headers.has("Cookie") , "Cookie header is not exposed in response");
+      if (credentialsMode === "include" && baseURL1 === baseURL2) {
+        assert_equals(resp.headers.get("x-request-cookie") , cookies.join("; "), "Request includes cookie(s)");
+      }
+      else {
+        assert_false(resp.headers.has("x-request-cookie") , "Request should have no cookie");
+      }
+      //clean cookies
+      return fetch(urlSetCookie + urlCleanParameters, {"credentials": "include"});
+    }).catch(function(e) {
+      return fetch(urlSetCookie + urlCleanParameters, {"credentials": "include"}).then(function(resp) {
+        throw e;
+      })
+    });
+  }, desc);
+}
+
+var local = get_host_info().HTTP_ORIGIN;
+var remote = get_host_info().HTTP_REMOTE_ORIGIN;
+// FIXME: otherRemote might not be accessible on some test environments.
+var otherRemote = local.replace("http://", "http://www.");
+
+corsCookies("Omit mode: no cookie sent", local, local, "omit", ["g=7"]);
+corsCookies("Include mode: 1 cookie", remote, remote, "include", ["a=1"]);
+corsCookies("Include mode: local cookies are not sent with remote request", local, remote, "include", ["c=3"]);
+corsCookies("Include mode: remote cookies are not sent with local request", remote, local, "include", ["d=4"]);
+corsCookies("Same-origin mode: cookies are discarded in cors request", remote, remote, "same-origin", ["f=6"]);
+corsCookies("Include mode: remote cookies are not sent with other remote request", remote, otherRemote, "include", ["e=5"]);
diff --git a/test/wpt/tests/fetch/api/cors/cors-expose-star.sub.any.js b/test/wpt/tests/fetch/api/cors/cors-expose-star.sub.any.js
new file mode 100644
index 00000000000..340e99ab5f9
--- /dev/null
+++ b/test/wpt/tests/fetch/api/cors/cors-expose-star.sub.any.js
@@ -0,0 +1,41 @@
+// META: script=../resources/utils.js
+
+const url = "http://{{host}}:{{ports[http][1]}}" + dirname(location.pathname) + RESOURCES_DIR + "top.txt",
+      sharedHeaders = "?pipe=header(Access-Control-Expose-Headers,*)|header(Test,X)|header(Set-Cookie,X)|header(*,whoa)|"
+
+promise_test(() => {
+  const headers = "header(Access-Control-Allow-Origin,*)"
+  return fetch(url + sharedHeaders + headers).then(resp => {
+    assert_equals(resp.status, 200)
+    assert_equals(resp.type , "cors")
+    assert_equals(resp.headers.get("test"), "X")
+    assert_equals(resp.headers.get("set-cookie"), null)
+    assert_equals(resp.headers.get("*"), "whoa")
+  })
+}, "Basic Access-Control-Expose-Headers: * support")
+
+promise_test(() => {
+  const origin = location.origin, // assuming an ASCII origin
+        headers = "header(Access-Control-Allow-Origin," + origin + ")|header(Access-Control-Allow-Credentials,true)"
+  return fetch(url + sharedHeaders + headers, { credentials:"include" }).then(resp => {
+    assert_equals(resp.status, 200)
+    assert_equals(resp.type , "cors")
+    assert_equals(resp.headers.get("content-type"), "text/plain") // safelisted
+    assert_equals(resp.headers.get("test"), null)
+    assert_equals(resp.headers.get("set-cookie"), null)
+    assert_equals(resp.headers.get("*"), "whoa")
+  })
+}, "* for credentialed fetches only matches literally")
+
+promise_test(() => {
+  const headers =  "header(Access-Control-Allow-Origin,*)|header(Access-Control-Expose-Headers,set-cookie\\,*)"
+  return fetch(url + sharedHeaders + headers).then(resp => {
+    assert_equals(resp.status, 200)
+    assert_equals(resp.type , "cors")
+    assert_equals(resp.headers.get("test"), "X")
+    assert_equals(resp.headers.get("set-cookie"), null)
+    assert_equals(resp.headers.get("*"), "whoa")
+  })
+}, "* can be one of several values")
+
+done();
diff --git a/test/wpt/tests/fetch/api/cors/cors-filtering.sub.any.js b/test/wpt/tests/fetch/api/cors/cors-filtering.sub.any.js
new file mode 100644
index 00000000000..a26eaccf2a5
--- /dev/null
+++ b/test/wpt/tests/fetch/api/cors/cors-filtering.sub.any.js
@@ -0,0 +1,69 @@
+// META: script=../resources/utils.js
+
+function corsFilter(corsUrl, headerName, headerValue, isFiltered) {
+  var url = corsUrl + "?pipe=header(" + headerName + "," + encodeURIComponent(headerValue) +")|header(Access-Control-Allow-Origin,*)";
+  promise_test(function(test) {
+    return fetch(url).then(function(resp) {
+      assert_equals(resp.status, 200, "Fetch success with code 200");
+      assert_equals(resp.type , "cors", "CORS fetch's response has cors type");
+      if (!isFiltered) {
+        assert_equals(resp.headers.get(headerName), headerValue,
+          headerName + " header should be included in response with value: " + headerValue);
+      } else {
+        assert_false(resp.headers.has(headerName), "UA should exclude " + headerName + " header from response");
+      }
+      test.done();
+    });
+  }, "CORS filter on " + headerName + " header");
+}
+
+function corsExposeFilter(corsUrl, headerName, headerValue, isForbidden, withCredentials) {
+  var url = corsUrl + "?pipe=header(" + headerName + "," + encodeURIComponent(headerValue) +")|" +
+                            "header(Access-Control-Allow-Origin, http://{{host}}:{{ports[http][0]}})" +
+                            "header(Access-Control-Allow-Credentials, true)" +
+                            "header(Access-Control-Expose-Headers," + headerName + ")";
+
+  var title = "CORS filter on " + headerName + " header, header is " + (isForbidden ? "forbidden" : "exposed");
+  if (withCredentials)
+      title+= "(credentials = include)";
+  promise_test(function(test) {
+    return fetch(new Request(url, { credentials: withCredentials ? "include" : "omit" })).then(function(resp) {
+      assert_equals(resp.status, 200, "Fetch success with code 200");
+      assert_equals(resp.type , "cors", "CORS fetch's response has cors type");
+      if (!isForbidden) {
+        assert_equals(resp.headers.get(headerName), headerValue,
+          headerName + " header should be included in response with value: " + headerValue);
+      } else {
+        assert_false(resp.headers.has(headerName), "UA should exclude " + headerName + " header from response");
+      }
+      test.done();
+    });
+  }, title);
+}
+
+var url = "http://{{host}}:{{ports[http][1]}}" + dirname(location.pathname) + RESOURCES_DIR + "top.txt";
+
+corsFilter(url, "Cache-Control", "no-cache", false);
+corsFilter(url, "Content-Language", "fr", false);
+corsFilter(url, "Content-Type", "text/html", false);
+corsFilter(url, "Expires","04 May 1988 22:22:22 GMT" , false);
+corsFilter(url, "Last-Modified", "04 May 1988 22:22:22 GMT", false);
+corsFilter(url, "Pragma", "no-cache", false);
+corsFilter(url, "Content-Length", "3" , false); // top.txt contains "top"
+
+corsFilter(url, "Age", "27", true);
+corsFilter(url, "Server", "wptServe" , true);
+corsFilter(url, "Warning", "Mind the gap" , true);
+corsFilter(url, "Set-Cookie", "name=value" , true);
+corsFilter(url, "Set-Cookie2", "name=value" , true);
+
+corsExposeFilter(url, "Age", "27", false);
+corsExposeFilter(url, "Server", "wptServe" , false);
+corsExposeFilter(url, "Warning", "Mind the gap" , false);
+
+corsExposeFilter(url, "Set-Cookie", "name=value" , true);
+corsExposeFilter(url, "Set-Cookie2", "name=value" , true);
+corsExposeFilter(url, "Set-Cookie", "name=value" , true, true);
+corsExposeFilter(url, "Set-Cookie2", "name=value" , true, true);
+
+done();
diff --git a/test/wpt/tests/fetch/api/cors/cors-multiple-origins.sub.any.js b/test/wpt/tests/fetch/api/cors/cors-multiple-origins.sub.any.js
new file mode 100644
index 00000000000..b3abb922841
--- /dev/null
+++ b/test/wpt/tests/fetch/api/cors/cors-multiple-origins.sub.any.js
@@ -0,0 +1,22 @@
+// META: global=window,worker
+// META: script=../resources/utils.js
+
+function corsMultipleOrigins(originList) {
+  var urlParameters = "?origin=" + encodeURIComponent(originList.join(", "));
+  var url = "http://{{host}}:{{ports[http][1]}}" + dirname(location.pathname) + RESOURCES_DIR + "preflight.py";
+
+  promise_test(function(test) {
+    return promise_rejects_js(test, TypeError, fetch(url + urlParameters));
+  }, "Listing multiple origins is illegal: " + originList);
+}
+/* Actual origin */
+var origin = "http://{{host}}:{{ports[http][0]}}";
+
+corsMultipleOrigins(["\"\"", "http://example.com", origin]);
+corsMultipleOrigins(["\"\"", "http://example.com", "*"]);
+corsMultipleOrigins(["\"\"", origin, origin]);
+corsMultipleOrigins(["*", "http://example.com", "*"]);
+corsMultipleOrigins(["*", "http://example.com", origin]);
+corsMultipleOrigins(["", "http://example.com", "https://example2.com"]);
+
+done();
diff --git a/test/wpt/tests/fetch/api/cors/cors-no-preflight.any.js b/test/wpt/tests/fetch/api/cors/cors-no-preflight.any.js
new file mode 100644
index 00000000000..7a0269aae4e
--- /dev/null
+++ b/test/wpt/tests/fetch/api/cors/cors-no-preflight.any.js
@@ -0,0 +1,41 @@
+// META: script=/common/utils.js
+// META: script=../resources/utils.js
+// META: script=/common/get-host-info.sub.js
+
+function corsNoPreflight(desc, baseURL, method, headerName, headerValue) {
+
+  var uuid_token = token();
+  var url = baseURL + dirname(location.pathname) + RESOURCES_DIR + "preflight.py";
+  var urlParameters = "?token=" + uuid_token + "&max_age=0";
+  var requestInit = {"mode": "cors", "method": method, "headers":{}};
+  if (headerName)
+    requestInit["headers"][headerName] = headerValue;
+
+  promise_test(function(test) {
+    return fetch(RESOURCES_DIR + "clean-stash.py?token=" + uuid_token).then(function(resp) {
+      assert_equals(resp.status, 200, "Clean stash response's status is 200");
+      return fetch(url + urlParameters, requestInit).then(function(resp) {
+        assert_equals(resp.status, 200, "Response's status is 200");
+        assert_equals(resp.headers.get("x-did-preflight"), "0", "No preflight request has been made");
+      });
+    });
+  }, desc);
+}
+
+var host_info = get_host_info();
+
+corsNoPreflight("Cross domain basic usage [GET]", host_info.HTTP_REMOTE_ORIGIN, "GET");
+corsNoPreflight("Same domain different port [GET]", host_info.HTTP_ORIGIN_WITH_DIFFERENT_PORT, "GET");
+corsNoPreflight("Cross domain different port [GET]", host_info.HTTP_REMOTE_ORIGIN_WITH_DIFFERENT_PORT, "GET");
+corsNoPreflight("Cross domain different protocol [GET]", host_info.HTTPS_REMOTE_ORIGIN, "GET");
+corsNoPreflight("Same domain different protocol different port [GET]", host_info.HTTPS_ORIGIN, "GET");
+corsNoPreflight("Cross domain [POST]", host_info.HTTP_REMOTE_ORIGIN, "POST");
+corsNoPreflight("Cross domain [HEAD]", host_info.HTTP_REMOTE_ORIGIN, "HEAD");
+corsNoPreflight("Cross domain [GET] [Accept: */*]", host_info.HTTP_REMOTE_ORIGIN, "GET" , "Accept", "*/*");
+corsNoPreflight("Cross domain [GET] [Accept-Language: fr]", host_info.HTTP_REMOTE_ORIGIN, "GET" , "Accept-Language", "fr");
+corsNoPreflight("Cross domain [GET] [Content-Language: fr]", host_info.HTTP_REMOTE_ORIGIN, "GET" , "Content-Language", "fr");
+corsNoPreflight("Cross domain [GET] [Content-Type: application/x-www-form-urlencoded]", host_info.HTTP_REMOTE_ORIGIN, "GET" , "Content-Type", "application/x-www-form-urlencoded");
+corsNoPreflight("Cross domain [GET] [Content-Type: multipart/form-data]", host_info.HTTP_REMOTE_ORIGIN, "GET" , "Content-Type", "multipart/form-data");
+corsNoPreflight("Cross domain [GET] [Content-Type: text/plain]", host_info.HTTP_REMOTE_ORIGIN, "GET" , "Content-Type", "text/plain");
+corsNoPreflight("Cross domain [GET] [Content-Type: text/plain;charset=utf-8]", host_info.HTTP_REMOTE_ORIGIN, "GET" , "Content-Type", "text/plain;charset=utf-8");
+corsNoPreflight("Cross domain [GET] [Content-Type: Text/Plain;charset=utf-8]", host_info.HTTP_REMOTE_ORIGIN, "GET" , "Content-Type", "Text/Plain;charset=utf-8");
diff --git a/test/wpt/tests/fetch/api/cors/cors-origin.any.js b/test/wpt/tests/fetch/api/cors/cors-origin.any.js
new file mode 100644
index 00000000000..30a02d910fd
--- /dev/null
+++ b/test/wpt/tests/fetch/api/cors/cors-origin.any.js
@@ -0,0 +1,51 @@
+// META: script=/common/utils.js
+// META: script=../resources/utils.js
+// META: script=/common/get-host-info.sub.js
+
+/* If origin is undefined, it is set to fetched url's origin*/
+function corsOrigin(desc, baseURL, method, origin, shouldPass) {
+  if (!origin)
+    origin = baseURL;
+
+  var uuid_token = token();
+  var urlParameters = "?token=" + uuid_token + "&max_age=0&origin=" + encodeURIComponent(origin) + "&allow_methods=" + method;
+  var url = baseURL + dirname(location.pathname) + RESOURCES_DIR + "preflight.py";
+  var requestInit = {"mode": "cors", "method": method};
+
+  promise_test(function(test) {
+    return fetch(RESOURCES_DIR + "clean-stash.py?token=" + uuid_token).then(function(resp) {
+      assert_equals(resp.status, 200, "Clean stash response's status is 200");
+      if (shouldPass) {
+        return fetch(url + urlParameters, requestInit).then(function(resp) {
+          assert_equals(resp.status, 200, "Response's status is 200");
+        });
+      } else {
+        return promise_rejects_js(test, TypeError, fetch(url + urlParameters, requestInit));
+      }
+    });
+  }, desc);
+
+}
+
+var host_info = get_host_info();
+
+/* Actual origin */
+var origin = host_info.HTTP_ORIGIN;
+
+corsOrigin("Cross domain different subdomain [origin OK]", host_info.HTTP_REMOTE_ORIGIN, "GET", origin, true);
+corsOrigin("Cross domain different subdomain [origin KO]", host_info.HTTP_REMOTE_ORIGIN, "GET", undefined, false);
+corsOrigin("Same domain different port [origin OK]", host_info.HTTP_ORIGIN_WITH_DIFFERENT_PORT, "GET", origin, true);
+corsOrigin("Same domain different port [origin KO]", host_info.HTTP_ORIGIN_WITH_DIFFERENT_PORT, "GET", undefined, false);
+corsOrigin("Cross domain different port [origin OK]", host_info.HTTP_REMOTE_ORIGIN_WITH_DIFFERENT_PORT, "GET", origin, true);
+corsOrigin("Cross domain different port [origin KO]", host_info.HTTP_REMOTE_ORIGIN_WITH_DIFFERENT_PORT, "GET", undefined, false);
+corsOrigin("Cross domain different protocol [origin OK]", host_info.HTTPS_REMOTE_ORIGIN, "GET", origin, true);
+corsOrigin("Cross domain different protocol [origin KO]", host_info.HTTPS_REMOTE_ORIGIN, "GET", undefined, false);
+corsOrigin("Same domain different protocol different port [origin OK]", host_info.HTTPS_ORIGIN, "GET", origin, true);
+corsOrigin("Same domain different protocol different port [origin KO]", host_info.HTTPS_ORIGIN, "GET", undefined, false);
+corsOrigin("Cross domain [POST] [origin OK]", host_info.HTTP_REMOTE_ORIGIN, "POST", origin, true);
+corsOrigin("Cross domain [POST] [origin KO]", host_info.HTTP_REMOTE_ORIGIN, "POST", undefined, false);
+corsOrigin("Cross domain [HEAD] [origin OK]", host_info.HTTP_REMOTE_ORIGIN, "HEAD", origin, true);
+corsOrigin("Cross domain [HEAD] [origin KO]", host_info.HTTP_REMOTE_ORIGIN, "HEAD", undefined, false);
+corsOrigin("CORS preflight [PUT] [origin OK]", host_info.HTTP_REMOTE_ORIGIN, "PUT", origin, true);
+corsOrigin("CORS preflight [PUT] [origin KO]", host_info.HTTP_REMOTE_ORIGIN, "PUT", undefined, false);
+corsOrigin("Allowed origin: \"\" [origin KO]", host_info.HTTP_REMOTE_ORIGIN, "GET", "" , false);
diff --git a/test/wpt/tests/fetch/api/cors/cors-preflight-cache.any.js b/test/wpt/tests/fetch/api/cors/cors-preflight-cache.any.js
new file mode 100644
index 00000000000..ce6a169d814
--- /dev/null
+++ b/test/wpt/tests/fetch/api/cors/cors-preflight-cache.any.js
@@ -0,0 +1,46 @@
+// META: script=/common/utils.js
+// META: script=../resources/utils.js
+// META: script=/common/get-host-info.sub.js
+
+var cors_url = get_host_info().HTTP_REMOTE_ORIGIN +
+              dirname(location.pathname) +
+              RESOURCES_DIR +
+              "preflight.py";
+
+promise_test((test) => {
+  var uuid_token = token();
+  var request_url =
+      cors_url + "?token=" + uuid_token + "&max_age=12000&allow_methods=POST" +
+      "&allow_headers=x-test-header";
+  return fetch(cors_url + "?token=" + uuid_token + "&clear-stash")
+    .then(() => {
+      return fetch(
+        new Request(request_url,
+                    {
+                      mode: "cors",
+                      method: "POST",
+                      headers: [["x-test-header", "test1"]]
+                    }));
+    })
+    .then((resp) => {
+      assert_equals(resp.status, 200, "Response's status is 200");
+      assert_equals(resp.headers.get("x-did-preflight"), "1", "Preflight request has been made");
+      return fetch(cors_url + "?token=" + uuid_token + "&clear-stash");
+    })
+    .then((res) => res.text())
+    .then((txt) => {
+      assert_equals(txt, "1", "Server stash must be cleared.");
+      return fetch(
+        new Request(request_url,
+                    {
+                      mode: "cors",
+                      method: "POST",
+                      headers: [["x-test-header", "test2"]]
+                    }));
+    })
+    .then((resp) => {
+      assert_equals(resp.status, 200, "Response's status is 200");
+      assert_equals(resp.headers.get("x-did-preflight"), "0", "Preflight request has not been made");
+      return fetch(cors_url + "?token=" + uuid_token + "&clear-stash");
+    });
+});
diff --git a/test/wpt/tests/fetch/api/cors/cors-preflight-not-cors-safelisted.any.js b/test/wpt/tests/fetch/api/cors/cors-preflight-not-cors-safelisted.any.js
new file mode 100644
index 00000000000..b2747ccd5bc
--- /dev/null
+++ b/test/wpt/tests/fetch/api/cors/cors-preflight-not-cors-safelisted.any.js
@@ -0,0 +1,19 @@
+// META: script=/common/utils.js
+// META: script=../resources/utils.js
+// META: script=/common/get-host-info.sub.js
+// META: script=resources/corspreflight.js
+
+const corsURL = get_host_info().HTTP_REMOTE_ORIGIN + dirname(location.pathname) + RESOURCES_DIR + "preflight.py";
+
+promise_test(() => fetch("resources/not-cors-safelisted.json").then(res => res.json().then(runTests)), "Loading data…");
+
+function runTests(testArray) {
+  testArray.forEach(testItem => {
+    const [headerName, headerValue] = testItem;
+    corsPreflight("Need CORS-preflight for " + headerName + "/" + headerValue + " header",
+                  corsURL,
+                  "GET",
+                  true,
+                  [[headerName, headerValue]]);
+  });
+}
diff --git a/test/wpt/tests/fetch/api/cors/cors-preflight-redirect.any.js b/test/wpt/tests/fetch/api/cors/cors-preflight-redirect.any.js
new file mode 100644
index 00000000000..15f7659abd2
--- /dev/null
+++ b/test/wpt/tests/fetch/api/cors/cors-preflight-redirect.any.js
@@ -0,0 +1,37 @@
+// META: global=window,worker
+// META: script=/common/utils.js
+// META: script=../resources/utils.js
+// META: script=/common/get-host-info.sub.js
+
+function corsPreflightRedirect(desc, redirectUrl, redirectLocation, redirectStatus, redirectPreflight) {
+  var uuid_token = token();
+  var url = redirectUrl;
+  var urlParameters = "?token=" + uuid_token + "&max_age=0";
+  urlParameters += "&redirect_status=" + redirectStatus;
+  urlParameters += "&location=" + encodeURIComponent(redirectLocation);
+
+  if (redirectPreflight)
+    urlParameters += "&redirect_preflight";
+  var requestInit = {"mode": "cors", "redirect": "follow"};
+
+  /* Force preflight */
+  requestInit["headers"] = {"x-force-preflight": ""};
+  urlParameters += "&allow_headers=x-force-preflight";
+
+  promise_test(function(test) {
+    return fetch(RESOURCES_DIR + "clean-stash.py?token=" + uuid_token).then(function(resp) {
+      assert_equals(resp.status, 200, "Clean stash response's status is 200");
+      return promise_rejects_js(test, TypeError, fetch(url + urlParameters, requestInit));
+    });
+  }, desc);
+}
+
+var redirectUrl = get_host_info().HTTP_REMOTE_ORIGIN + dirname(location.pathname) + RESOURCES_DIR + "redirect.py";
+var locationUrl =  get_host_info().HTTP_REMOTE_ORIGIN + dirname(location.pathname) + RESOURCES_DIR + "preflight.py";
+
+for (var code of [301, 302, 303, 307, 308]) {
+  /* preflight should not follow the redirection */
+  corsPreflightRedirect("Redirection " + code + " on preflight failed", redirectUrl, locationUrl, code, true);
+  /* preflight is done before redirection: preflight force redirect to error */
+  corsPreflightRedirect("Redirection " + code + " after preflight failed", redirectUrl, locationUrl, code, false);
+}
diff --git a/test/wpt/tests/fetch/api/cors/cors-preflight-referrer.any.js b/test/wpt/tests/fetch/api/cors/cors-preflight-referrer.any.js
new file mode 100644
index 00000000000..5df9fcf1429
--- /dev/null
+++ b/test/wpt/tests/fetch/api/cors/cors-preflight-referrer.any.js
@@ -0,0 +1,51 @@
+// META: script=/common/utils.js
+// META: script=../resources/utils.js
+// META: script=/common/get-host-info.sub.js
+
+function corsPreflightReferrer(desc, corsUrl, referrerPolicy, referrer, expectedReferrer) {
+  var uuid_token = token();
+  var url = corsUrl;
+  var urlParameters = "?token=" + uuid_token + "&max_age=0";
+  var requestInit = {"mode": "cors", "referrerPolicy": referrerPolicy};
+
+  if (referrer)
+      requestInit.referrer = referrer;
+
+  /* Force preflight */
+  requestInit["headers"] = {"x-force-preflight": ""};
+  urlParameters += "&allow_headers=x-force-preflight";
+
+  promise_test(function(test) {
+    return fetch(RESOURCES_DIR + "clean-stash.py?token=" + uuid_token).then(function(resp) {
+      assert_equals(resp.status, 200, "Clean stash response's status is 200");
+      return fetch(url + urlParameters, requestInit).then(function(resp) {
+        assert_equals(resp.status, 200, "Response's status is 200");
+        assert_equals(resp.headers.get("x-did-preflight"), "1", "Preflight request has been made");
+        assert_equals(resp.headers.get("x-preflight-referrer"), expectedReferrer, "Preflight's referrer is correct");
+        assert_equals(resp.headers.get("x-referrer"), expectedReferrer, "Request's referrer is correct");
+        assert_equals(resp.headers.get("x-control-request-headers"), "", "Access-Control-Allow-Headers value");
+      });
+    });
+  }, desc + " and referrer: " + (referrer ? "'" + referrer + "'" : "default"));
+}
+
+var corsUrl = get_host_info().HTTP_REMOTE_ORIGIN  + dirname(location.pathname) + RESOURCES_DIR + "preflight.py";
+var origin = get_host_info().HTTP_ORIGIN + "/";
+
+corsPreflightReferrer("Referrer policy: no-referrer", corsUrl, "no-referrer", undefined, "");
+corsPreflightReferrer("Referrer policy: no-referrer", corsUrl, "no-referrer", "myreferrer", "");
+
+corsPreflightReferrer("Referrer policy: \"\"", corsUrl, "", undefined, origin);
+corsPreflightReferrer("Referrer policy: \"\"", corsUrl, "", "myreferrer", origin);
+
+corsPreflightReferrer("Referrer policy: no-referrer-when-downgrade", corsUrl, "no-referrer-when-downgrade", undefined, location.toString())
+corsPreflightReferrer("Referrer policy: no-referrer-when-downgrade", corsUrl, "no-referrer-when-downgrade", "myreferrer", new URL("myreferrer", location).toString());
+
+corsPreflightReferrer("Referrer policy: origin", corsUrl, "origin", undefined, origin);
+corsPreflightReferrer("Referrer policy: origin", corsUrl, "origin", "myreferrer", origin);
+
+corsPreflightReferrer("Referrer policy: origin-when-cross-origin", corsUrl, "origin-when-cross-origin", undefined, origin);
+corsPreflightReferrer("Referrer policy: origin-when-cross-origin", corsUrl, "origin-when-cross-origin", "myreferrer", origin);
+
+corsPreflightReferrer("Referrer policy: unsafe-url", corsUrl, "unsafe-url", undefined, location.toString());
+corsPreflightReferrer("Referrer policy: unsafe-url", corsUrl, "unsafe-url", "myreferrer", new URL("myreferrer", location).toString());
diff --git a/test/wpt/tests/fetch/api/cors/cors-preflight-response-validation.any.js b/test/wpt/tests/fetch/api/cors/cors-preflight-response-validation.any.js
new file mode 100644
index 00000000000..718e351c1d3
--- /dev/null
+++ b/test/wpt/tests/fetch/api/cors/cors-preflight-response-validation.any.js
@@ -0,0 +1,33 @@
+// META: script=/common/utils.js
+// META: script=../resources/utils.js
+// META: script=/common/get-host-info.sub.js
+
+function corsPreflightResponseValidation(desc, corsUrl, allowHeaders, allowMethods) {
+  var uuid_token = token();
+  var url = corsUrl;
+  var requestInit = {"mode": "cors"};
+  /* Force preflight */
+  requestInit["headers"] = {"x-force-preflight": ""};
+
+  var urlParameters = "?token=" + uuid_token + "&max_age=0";
+  urlParameters += "&allow_headers=x-force-preflight";
+  if (allowHeaders)
+    urlParameters += "," + allowHeaders;
+  if (allowMethods)
+    urlParameters += "&allow_methods="+ allowMethods;
+
+  promise_test(function(test) {
+    return fetch(RESOURCES_DIR + "clean-stash.py?token=" + uuid_token).then(async function(resp) {
+      assert_equals(resp.status, 200, "Clean stash response's status is 200");
+      await promise_rejects_js(test, TypeError, fetch(url + urlParameters, requestInit));
+
+      return fetch(url + urlParameters).then(function(resp) {
+        assert_equals(resp.headers.get("x-did-preflight"), "1", "Preflight request has been made");
+      });
+    });
+  }, desc);
+}
+
+var corsUrl = get_host_info().HTTP_REMOTE_ORIGIN + dirname(location.pathname) + RESOURCES_DIR + "preflight.py";
+corsPreflightResponseValidation("Preflight response with a bad Access-Control-Allow-Headers", corsUrl, "Bad value", null);
+corsPreflightResponseValidation("Preflight response with a bad Access-Control-Allow-Methods", corsUrl, null, "Bad value");
diff --git a/test/wpt/tests/fetch/api/cors/cors-preflight-star.any.js b/test/wpt/tests/fetch/api/cors/cors-preflight-star.any.js
new file mode 100644
index 00000000000..e8cbc80b808
--- /dev/null
+++ b/test/wpt/tests/fetch/api/cors/cors-preflight-star.any.js
@@ -0,0 +1,82 @@
+// META: script=../resources/utils.js
+// META: script=/common/get-host-info.sub.js
+
+const url = get_host_info().HTTP_REMOTE_ORIGIN + dirname(location.pathname) + RESOURCES_DIR + "preflight.py",
+      origin = location.origin // assuming an ASCII origin
+
+function preflightTest(succeeds, withCredentials, allowMethod, allowHeader, useMethod, useHeader) {
+  return promise_test(t => {
+    let testURL = url + "?",
+        requestInit = {}
+    if (withCredentials) {
+      testURL += "origin=" + origin + "&"
+      testURL += "credentials&"
+      requestInit.credentials = "include"
+    }
+    if (useMethod) {
+      requestInit.method = useMethod
+    }
+    if (useHeader.length > 0) {
+      requestInit.headers = [useHeader]
+    }
+    testURL += "allow_methods=" + allowMethod + "&"
+    testURL += "allow_headers=" + allowHeader + "&"
+
+    if (succeeds) {
+      return fetch(testURL, requestInit).then(resp => {
+        assert_equals(resp.headers.get("x-origin"), origin)
+      })
+    } else {
+      return promise_rejects_js(t, TypeError, fetch(testURL, requestInit))
+    }
+  }, "CORS that " + (succeeds ? "succeeds" : "fails") + " with credentials: " + withCredentials + "; method: " + useMethod + " (allowed: " + allowMethod + "); header: " + useHeader + " (allowed: " + allowHeader + ")")
+}
+
+// "GET" does not pass the case-sensitive method check, but in the safe list.
+preflightTest(true, false, "get", "x-test", "GET", ["X-Test", "1"])
+// Headers check is case-insensitive, and "*" works as any for method.
+preflightTest(true, false, "*", "x-test", "SUPER", ["X-Test", "1"])
+// "*" works as any only without credentials.
+preflightTest(true, false, "*", "*", "OK", ["X-Test", "1"])
+preflightTest(false, true, "*", "*", "OK", ["X-Test", "1"])
+preflightTest(false, true, "*", "", "PUT", [])
+preflightTest(false, true, "get", "*", "GET", ["X-Test", "1"])
+preflightTest(false, true, "*", "*", "GET", ["X-Test", "1"])
+// Exact character match works even for "*" with credentials.
+preflightTest(true, true, "*", "*", "*", ["*", "1"])
+
+// The following methods are upper-cased for init["method"] by
+// https://fetch.spec.whatwg.org/#concept-method-normalize
+// but not in Access-Control-Allow-Methods response.
+// But they are https://fetch.spec.whatwg.org/#cors-safelisted-method,
+// CORS anyway passes regardless of the cases.
+for (const METHOD of ['GET', 'HEAD', 'POST']) {
+  const method = METHOD.toLowerCase();
+  preflightTest(true, true, METHOD, "*", METHOD, [])
+  preflightTest(true, true, METHOD, "*", method, [])
+  preflightTest(true, true, method, "*", METHOD, [])
+  preflightTest(true, true, method, "*", method, [])
+}
+
+// The following methods are upper-cased for init["method"] by
+// https://fetch.spec.whatwg.org/#concept-method-normalize
+// but not in Access-Control-Allow-Methods response.
+// As they are not https://fetch.spec.whatwg.org/#cors-safelisted-method,
+// Access-Control-Allow-Methods should contain upper-cased methods,
+// while init["method"] can be either in upper or lower case.
+for (const METHOD of ['DELETE', 'PUT']) {
+  const method = METHOD.toLowerCase();
+  preflightTest(true, true, METHOD, "*", METHOD, [])
+  preflightTest(true, true, METHOD, "*", method, [])
+  preflightTest(false, true, method, "*", METHOD, [])
+  preflightTest(false, true, method, "*", method, [])
+}
+
+// "PATCH" is NOT upper-cased in both places because it is not listed in
+// https://fetch.spec.whatwg.org/#concept-method-normalize.
+// So Access-Control-Allow-Methods value and init["method"] should match
+// case-sensitively.
+preflightTest(true, true, "PATCH", "*", "PATCH", [])
+preflightTest(false, true, "PATCH", "*", "patch", [])
+preflightTest(false, true, "patch", "*", "PATCH", [])
+preflightTest(true, true, "patch", "*", "patch", [])
diff --git a/test/wpt/tests/fetch/api/cors/cors-preflight-status.any.js b/test/wpt/tests/fetch/api/cors/cors-preflight-status.any.js
new file mode 100644
index 00000000000..a4467a6087b
--- /dev/null
+++ b/test/wpt/tests/fetch/api/cors/cors-preflight-status.any.js
@@ -0,0 +1,37 @@
+// META: script=/common/utils.js
+// META: script=../resources/utils.js
+// META: script=/common/get-host-info.sub.js
+
+/* Check preflight is ok if status is ok status (200  to 299)*/
+function corsPreflightStatus(desc, corsUrl, preflightStatus) {
+  var uuid_token = token();
+  var url = corsUrl;
+  var requestInit = {"mode": "cors"};
+  /* Force preflight */
+  requestInit["headers"] = {"x-force-preflight": ""};
+
+  var urlParameters = "?token=" + uuid_token + "&max_age=0";
+  urlParameters += "&allow_headers=x-force-preflight";
+  urlParameters += "&preflight_status=" + preflightStatus;
+
+  promise_test(function(test) {
+    return fetch(RESOURCES_DIR + "clean-stash.py?token=" + uuid_token).then(function(resp) {
+      assert_equals(resp.status, 200, "Clean stash response's status is 200");
+      if (200 <= preflightStatus && 299 >= preflightStatus) {
+        return fetch(url + urlParameters, requestInit).then(function(resp) {
+          assert_equals(resp.status, 200, "Response's status is 200");
+          assert_equals(resp.headers.get("x-did-preflight"), "1", "Preflight request has been made");
+        });
+      } else {
+        return promise_rejects_js(test, TypeError, fetch(url + urlParameters, requestInit));
+      }
+    });
+  }, desc);
+}
+
+var corsUrl = get_host_info().HTTP_REMOTE_ORIGIN + dirname(location.pathname) + RESOURCES_DIR + "preflight.py";
+for (status of [200, 201, 202, 203, 204, 205, 206,
+                300, 301, 302, 303, 304, 305, 306, 307, 308,
+                400, 401, 402, 403, 404, 405,
+                501, 502, 503, 504, 505])
+  corsPreflightStatus("Preflight answered with status " + status, corsUrl, status);
diff --git a/test/wpt/tests/fetch/api/cors/cors-preflight.any.js b/test/wpt/tests/fetch/api/cors/cors-preflight.any.js
new file mode 100644
index 00000000000..045422f40b1
--- /dev/null
+++ b/test/wpt/tests/fetch/api/cors/cors-preflight.any.js
@@ -0,0 +1,62 @@
+// META: script=/common/utils.js
+// META: script=../resources/utils.js
+// META: script=/common/get-host-info.sub.js
+// META: script=resources/corspreflight.js
+
+var corsUrl = get_host_info().HTTP_REMOTE_ORIGIN + dirname(location.pathname) + RESOURCES_DIR + "preflight.py";
+
+corsPreflight("CORS [DELETE], server allows", corsUrl, "DELETE", true);
+corsPreflight("CORS [DELETE], server refuses", corsUrl, "DELETE", false);
+corsPreflight("CORS [PUT], server allows", corsUrl, "PUT", true);
+corsPreflight("CORS [PUT], server allows, check preflight has user agent", corsUrl + "?checkUserAgentHeaderInPreflight", "PUT", true);
+corsPreflight("CORS [PUT], server refuses", corsUrl, "PUT", false);
+corsPreflight("CORS [PATCH], server allows", corsUrl, "PATCH", true);
+corsPreflight("CORS [PATCH], server refuses", corsUrl, "PATCH", false);
+corsPreflight("CORS [patcH], server allows", corsUrl, "patcH", true);
+corsPreflight("CORS [patcH], server refuses", corsUrl, "patcH", false);
+corsPreflight("CORS [NEW], server allows", corsUrl, "NEW", true);
+corsPreflight("CORS [NEW], server refuses", corsUrl, "NEW", false);
+corsPreflight("CORS [chicken], server allows", corsUrl, "chicken", true);
+corsPreflight("CORS [chicken], server refuses", corsUrl, "chicken", false);
+
+corsPreflight("CORS [GET] [x-test-header: allowed], server allows", corsUrl, "GET", true, [["x-test-header1", "allowed"]]);
+corsPreflight("CORS [GET] [x-test-header: refused], server refuses", corsUrl, "GET", false, [["x-test-header1", "refused"]]);
+
+var headers = [
+    ["x-test-header1", "allowedOrRefused"],
+    ["x-test-header2", "allowedOrRefused"],
+    ["X-test-header3", "allowedOrRefused"],
+    ["x-test-header-b", "allowedOrRefused"],
+    ["x-test-header-D", "allowedOrRefused"],
+    ["x-test-header-C", "allowedOrRefused"],
+    ["x-test-header-a", "allowedOrRefused"],
+    ["Content-Type", "allowedOrRefused"],
+];
+var safeHeaders= [
+    ["Accept", "*"],
+    ["Accept-Language", "bzh"],
+    ["Content-Language", "eu"],
+];
+
+corsPreflight("CORS [GET] [several headers], server allows", corsUrl, "GET", true, headers, safeHeaders);
+corsPreflight("CORS [GET] [several headers], server refuses", corsUrl, "GET", false, headers, safeHeaders);
+corsPreflight("CORS [PUT] [several headers], server allows", corsUrl, "PUT", true, headers, safeHeaders);
+corsPreflight("CORS [PUT] [several headers], server refuses", corsUrl, "PUT", false, headers, safeHeaders);
+
+corsPreflight("CORS [PUT] [only safe headers], server allows", corsUrl, "PUT", true, null, safeHeaders);
+
+promise_test(async t => {
+  const url = `${corsUrl}?allow_headers=*`;
+  await promise_rejects_js(t, TypeError, fetch(url, {
+    headers: {
+      authorization: 'foobar'
+    }
+  }));
+}, '"authorization" should not be covered by the wildcard symbol');
+
+promise_test(async t => {
+  const url = `${corsUrl}?allow_headers=authorization`;
+  await fetch(url, { headers: {
+    authorization: 'foobar'
+  }});
+}, '"authorization" should be covered by "authorization"');
\ No newline at end of file
diff --git a/test/wpt/tests/fetch/api/cors/cors-redirect-credentials.any.js b/test/wpt/tests/fetch/api/cors/cors-redirect-credentials.any.js
new file mode 100644
index 00000000000..2aff3134063
--- /dev/null
+++ b/test/wpt/tests/fetch/api/cors/cors-redirect-credentials.any.js
@@ -0,0 +1,52 @@
+// META: timeout=long
+// META: script=../resources/utils.js
+// META: script=/common/get-host-info.sub.js
+
+function corsRedirectCredentials(desc, redirectUrl, redirectLocation, redirectStatus, locationCredentials) {
+  var url = redirectUrl
+  var urlParameters = "?redirect_status=" + redirectStatus;
+  urlParameters += "&location=" + redirectLocation.replace("://", "://" + locationCredentials + "@");
+
+  var requestInit = {"mode": "cors", "redirect": "follow"};
+
+  promise_test(t => {
+    const result = fetch(url + urlParameters, requestInit)
+    if(locationCredentials === "") {
+      return result;
+    } else {
+      return promise_rejects_js(t, TypeError, result);
+    }
+  }, desc);
+}
+
+var redirPath = dirname(location.pathname) + RESOURCES_DIR + "redirect.py";
+var preflightPath = dirname(location.pathname) + RESOURCES_DIR + "preflight.py";
+
+var host_info = get_host_info();
+
+var localRedirect = host_info.HTTP_ORIGIN + redirPath;
+var remoteRedirect = host_info.HTTP_ORIGIN_WITH_DIFFERENT_PORT + redirPath;
+
+var localLocation = host_info.HTTP_ORIGIN + preflightPath;
+var remoteLocation = host_info.HTTP_ORIGIN_WITH_DIFFERENT_PORT + preflightPath;
+var remoteLocation2 = host_info.HTTP_REMOTE_ORIGIN + preflightPath;
+
+for (var code of [301, 302, 303, 307, 308]) {
+  corsRedirectCredentials("Redirect " + code + " from same origin to remote without user and password", localRedirect, remoteLocation, code, "");
+
+  corsRedirectCredentials("Redirect " + code + " from same origin to remote with user and password", localRedirect, remoteLocation, code, "user:password");
+  corsRedirectCredentials("Redirect " + code + " from same origin to remote with user", localRedirect, remoteLocation, code, "user:");
+  corsRedirectCredentials("Redirect " + code + " from same origin to remote with password", localRedirect, remoteLocation, code, ":password");
+
+  corsRedirectCredentials("Redirect " + code + " from remote to same origin with user and password", remoteRedirect, localLocation, code, "user:password");
+  corsRedirectCredentials("Redirect " + code + " from remote to same origin with user", remoteRedirect, localLocation, code, "user:");
+  corsRedirectCredentials("Redirect " + code + " from remote to same origin with password", remoteRedirect, localLocation, code, ":password");
+
+  corsRedirectCredentials("Redirect " + code + " from remote to same remote with user and password", remoteRedirect, remoteLocation, code, "user:password");
+  corsRedirectCredentials("Redirect " + code + " from remote to same remote with user", remoteRedirect, remoteLocation, code, "user:");
+  corsRedirectCredentials("Redirect " + code + " from remote to same remote with password", remoteRedirect, remoteLocation, code, ":password");
+
+  corsRedirectCredentials("Redirect " + code + " from remote to another remote with user and password", remoteRedirect, remoteLocation2, code, "user:password");
+  corsRedirectCredentials("Redirect " + code + " from remote to another remote with user", remoteRedirect, remoteLocation2, code, "user:");
+  corsRedirectCredentials("Redirect " + code + " from remote to another remote with password", remoteRedirect, remoteLocation2, code, ":password");
+}
diff --git a/test/wpt/tests/fetch/api/cors/cors-redirect-preflight.any.js b/test/wpt/tests/fetch/api/cors/cors-redirect-preflight.any.js
new file mode 100644
index 00000000000..50848170d0d
--- /dev/null
+++ b/test/wpt/tests/fetch/api/cors/cors-redirect-preflight.any.js
@@ -0,0 +1,46 @@
+// META: timeout=long
+// META: script=/common/utils.js
+// META: script=../resources/utils.js
+// META: script=/common/get-host-info.sub.js
+
+function corsRedirect(desc, redirectUrl, redirectLocation, redirectStatus, expectSuccess) {
+  var urlBaseParameters = "&redirect_status=" + redirectStatus;
+  var urlParametersSuccess = urlBaseParameters + "&allow_headers=x-w3c&location=" + encodeURIComponent(redirectLocation + "?allow_headers=x-w3c");
+  var urlParametersFailure = urlBaseParameters + "&location=" + encodeURIComponent(redirectLocation);
+
+  var requestInit = {"mode": "cors", "redirect": "follow", "headers" : [["x-w3c", "test"]]};
+
+  promise_test(function(test) {
+    var uuid_token = token();
+    return fetch(RESOURCES_DIR + "clean-stash.py?token=" + uuid_token).then(function(resp) {
+      return fetch(redirectUrl + "?token=" + uuid_token + "&max_age=0" + urlParametersSuccess, requestInit).then(function(resp) {
+        assert_equals(resp.status, 200, "Response's status is 200");
+        assert_equals(resp.headers.get("x-did-preflight"), "1", "Preflight request has been made");
+      });
+    });
+  }, desc + " (preflight after redirection success case)");
+  promise_test(function(test) {
+    var uuid_token = token();
+    return fetch(RESOURCES_DIR + "clean-stash.py?token=" + uuid_token).then(function(resp) {
+      return promise_rejects_js(test, TypeError, fetch(redirectUrl + "?token=" + uuid_token + "&max_age=0" + urlParametersFailure, requestInit));
+    });
+  }, desc + " (preflight after redirection failure case)");
+}
+
+var redirPath = dirname(location.pathname) + RESOURCES_DIR + "redirect.py";
+var preflightPath = dirname(location.pathname) + RESOURCES_DIR + "preflight.py";
+
+var host_info = get_host_info();
+
+var localRedirect = host_info.HTTP_ORIGIN + redirPath;
+var remoteRedirect = host_info.HTTP_REMOTE_ORIGIN + redirPath;
+
+var localLocation = host_info.HTTP_ORIGIN + preflightPath;
+var remoteLocation = host_info.HTTP_REMOTE_ORIGIN + preflightPath;
+var remoteLocation2 = host_info.HTTP_ORIGIN_WITH_DIFFERENT_PORT + preflightPath;
+
+for (var code of [301, 302, 303, 307, 308]) {
+  corsRedirect("Redirect " + code + ": same origin to cors", localRedirect, remoteLocation, code);
+  corsRedirect("Redirect " + code + ": cors to same origin", remoteRedirect, localLocation, code);
+  corsRedirect("Redirect " + code + ": cors to another cors", remoteRedirect, remoteLocation2, code);
+}
diff --git a/test/wpt/tests/fetch/api/cors/cors-redirect.any.js b/test/wpt/tests/fetch/api/cors/cors-redirect.any.js
new file mode 100644
index 00000000000..cdf4097d566
--- /dev/null
+++ b/test/wpt/tests/fetch/api/cors/cors-redirect.any.js
@@ -0,0 +1,42 @@
+// META: script=/common/utils.js
+// META: script=../resources/utils.js
+// META: script=/common/get-host-info.sub.js
+
+function corsRedirect(desc, redirectUrl, redirectLocation, redirectStatus, expectedOrigin) {
+  var uuid_token = token();
+  var url = redirectUrl;
+  var urlParameters = "?token=" + uuid_token + "&max_age=0";
+  urlParameters += "&redirect_status=" + redirectStatus;
+  urlParameters += "&location=" + encodeURIComponent(redirectLocation);
+
+  var requestInit = {"mode": "cors", "redirect": "follow"};
+
+  return promise_test(function(test) {
+    return fetch(RESOURCES_DIR + "clean-stash.py?token=" + uuid_token).then(function(resp) {
+      return fetch(url + urlParameters, requestInit).then(function(resp) {
+        assert_equals(resp.status, 200, "Response's status is 200");
+        assert_equals(resp.headers.get("x-did-preflight"), "0", "No preflight request has been made");
+        assert_equals(resp.headers.get("x-origin"), expectedOrigin, "Origin is correctly set after redirect");
+      });
+    });
+  }, desc);
+}
+
+var redirPath = dirname(location.pathname) + RESOURCES_DIR + "redirect.py";
+var preflightPath = dirname(location.pathname) + RESOURCES_DIR + "preflight.py";
+
+var host_info = get_host_info();
+
+var localRedirect = host_info.HTTP_ORIGIN + redirPath;
+var remoteRedirect = host_info.HTTP_REMOTE_ORIGIN + redirPath;
+
+var localLocation = host_info.HTTP_ORIGIN + preflightPath;
+var remoteLocation = host_info.HTTP_REMOTE_ORIGIN + preflightPath;
+var remoteLocation2 = host_info.HTTP_ORIGIN_WITH_DIFFERENT_PORT + preflightPath;
+
+for (var code of [301, 302, 303, 307, 308]) {
+  corsRedirect("Redirect " + code + ": cors to same cors", remoteRedirect, remoteLocation, code, location.origin);
+  corsRedirect("Redirect " + code + ": cors to another cors", remoteRedirect, remoteLocation2, code, "null");
+  corsRedirect("Redirect " + code + ": same origin to cors", localRedirect, remoteLocation, code, location.origin);
+  corsRedirect("Redirect " + code + ": cors to same origin", remoteRedirect, localLocation, code, "null");
+}
diff --git a/test/wpt/tests/fetch/api/cors/data-url-iframe.html b/test/wpt/tests/fetch/api/cors/data-url-iframe.html
new file mode 100644
index 00000000000..217baa3c46b
--- /dev/null
+++ b/test/wpt/tests/fetch/api/cors/data-url-iframe.html
@@ -0,0 +1,58 @@
+<!DOCTYPE html>
+<html>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<body></body>
+<script>
+
+const createDataUrlIframe = (url, cors) => {
+  const iframe = document.createElement("iframe");
+  const fetchURL = new URL(url, location.href) +
+      `${cors === 'null-origin'
+           ? '?pipe=header(Access-Control-Allow-Origin, null)' : ''}`;
+  const tag_name = 'script';
+  iframe.src =
+      `data:text/html, <${tag_name}>` +
+      `async function test() {` +
+      `  let allowed = true;` +
+      `  try {` +
+      `    await fetch('${fetchURL}');` +
+      `  } catch (e) {` +
+      `    allowed = false;` +
+      `  }` +
+      `  parent.postMessage({allowed}, '*');` +
+      `}` +
+      `test(); </${tag_name}>`;
+  return iframe;
+};
+
+const fetch_from_data_url_iframe_test =
+    (url, cors, expectation, description) => {
+  promise_test(async () => {
+    const iframe = createDataUrlIframe(url, cors);
+    document.body.appendChild(iframe);
+    const msgEvent = await new Promise(resolve => window.onmessage = resolve);
+    assert_equals(msgEvent.data.allowed ? 'allowed' : 'rejected', expectation);
+  }, description);
+};
+
+fetch_from_data_url_iframe_test(
+  '../resources/top.txt',
+  'acao-omitted',
+  'rejected',
+  'fetching "top.txt" without ACAO should be rejected.'
+);
+fetch_from_data_url_iframe_test(
+  '../resources/top.txt',
+  'null-origin',
+  'allowed',
+  'fetching "top.txt" with CORS allowing null origin should be allowed.'
+);
+fetch_from_data_url_iframe_test(
+  'data:text/plain, top',
+  'acao-omitted',
+  'allowed',
+  'fetching data url script should be allowed.'
+);
+
+</script>
diff --git a/test/wpt/tests/fetch/api/cors/data-url-shared-worker.html b/test/wpt/tests/fetch/api/cors/data-url-shared-worker.html
new file mode 100644
index 00000000000..d69748ab261
--- /dev/null
+++ b/test/wpt/tests/fetch/api/cors/data-url-shared-worker.html
@@ -0,0 +1,53 @@
+<!DOCTYPE html>
+<html>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script>
+
+const fetch_from_data_url_worker_test =
+    (url, cors, expectation, description) => {
+  promise_test(async () => {
+    const fetchURL = new URL(url, location.href) +
+        `${cors === 'null-origin'
+             ? '?pipe=header(Access-Control-Allow-Origin, null)' : ''}`;
+    const scriptURL =
+      `data:text/javascript,` +
+      `async function test(port) {` +
+      `  let allowed = true;` +
+      `  try {` +
+      `    await fetch('${fetchURL}');` +
+      `  } catch (e) {` +
+      `    allowed = false;` +
+      `  }` +
+      `  port.postMessage({allowed});` +
+      `}` +
+      `onconnect = e => {` +
+      `  test(e.ports[0]);` +
+      `};`;
+    const worker = new SharedWorker(scriptURL);
+    const msgEvent =
+        await new Promise(resolve => worker.port.onmessage = resolve);
+    assert_equals(msgEvent.data.allowed ? 'allowed' : 'rejected', expectation);
+  }, description);
+};
+
+fetch_from_data_url_worker_test(
+  '../resources/top.txt',
+  'acao-omitted',
+  'rejected',
+  'fetching "top.txt" without ACAO should be rejected.'
+);
+fetch_from_data_url_worker_test(
+  '../resources/top.txt',
+  'null-origin',
+  'allowed',
+  'fetching "top.txt" with CORS allowing null origin should be allowed.'
+);
+fetch_from_data_url_worker_test(
+  'data:text/plain, top',
+  'acao-omitted',
+  'allowed',
+  'fetching data url script should be allowed.'
+);
+
+</script>
diff --git a/test/wpt/tests/fetch/api/cors/data-url-worker.html b/test/wpt/tests/fetch/api/cors/data-url-worker.html
new file mode 100644
index 00000000000..13113e62621
--- /dev/null
+++ b/test/wpt/tests/fetch/api/cors/data-url-worker.html
@@ -0,0 +1,50 @@
+<!DOCTYPE html>
+<html>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script>
+
+const fetch_from_data_url_shared_worker_test =
+    (url, cors, expectation, description) => {
+  promise_test(async () => {
+    const fetchURL = new URL(url, location.href) +
+        `${cors === 'null-origin'
+             ? '?pipe=header(Access-Control-Allow-Origin, null)' : ''}`;
+    const scriptURL =
+      `data:text/javascript,` +
+      `async function test() {` +
+      `  let allowed = true;` +
+      `  try {` +
+      `    await fetch('${fetchURL}');` +
+      `  } catch (e) {` +
+      `    allowed = false;` +
+      `  }` +
+      `  postMessage({allowed});` +
+      `}` +
+      `test();`;
+    const worker = new Worker(scriptURL);
+    const msgEvent = await new Promise(resolve => worker.onmessage = resolve);
+    assert_equals(msgEvent.data.allowed ? 'allowed' : 'rejected', expectation);
+  }, description);
+};
+
+fetch_from_data_url_shared_worker_test(
+  '../resources/top.txt',
+  'acao-omitted',
+  'rejected',
+  'fetching "top.txt" without ACAO should be rejected.'
+);
+fetch_from_data_url_shared_worker_test(
+  '../resources/top.txt',
+  'null-origin',
+  'allowed',
+  'fetching "top.txt" with CORS allowing null origin should be allowed.'
+);
+fetch_from_data_url_shared_worker_test(
+  'data:text/plain, top',
+  'acao-omitted',
+  'allowed',
+  'fetching data url script should be allowed.'
+);
+
+</script>
diff --git a/test/wpt/tests/fetch/api/cors/resources/corspreflight.js b/test/wpt/tests/fetch/api/cors/resources/corspreflight.js
new file mode 100644
index 00000000000..18b8f6dfa28
--- /dev/null
+++ b/test/wpt/tests/fetch/api/cors/resources/corspreflight.js
@@ -0,0 +1,58 @@
+function headerNames(headers) {
+  let names = [];
+  for (let header of headers) {
+    names.push(header[0].toLowerCase());
+  }
+  return names;
+}
+
+/*
+  Check preflight is done
+  Control if server allows method and headers and check accordingly
+  Check control access headers added by UA (for method and headers)
+*/
+function corsPreflight(desc, corsUrl, method, allowed, headers, safeHeaders) {
+  return promise_test(function(test) {
+    var uuid_token = token();
+    return fetch(RESOURCES_DIR + "clean-stash.py?token=" + uuid_token).then(function(response) {
+      var url = corsUrl + (corsUrl.indexOf("?") === -1 ? "?" : "&");
+      var urlParameters = "token=" + uuid_token + "&max_age=0";
+      var requestInit = {"mode": "cors", "method": method};
+      var requestHeaders = [];
+      if (headers)
+        requestHeaders.push.apply(requestHeaders, headers);
+      if (safeHeaders)
+        requestHeaders.push.apply(requestHeaders, safeHeaders);
+      requestInit["headers"] = requestHeaders;
+
+      if (allowed) {
+        urlParameters += "&allow_methods=" + method + "&control_request_headers";
+        if (headers) {
+          //Make the server allow the headers
+          urlParameters += "&allow_headers=" + headerNames(headers).join("%20%2C");
+        }
+        return fetch(url + urlParameters, requestInit).then(function(resp) {
+          assert_equals(resp.status, 200, "Response's status is 200");
+          assert_equals(resp.headers.get("x-did-preflight"), "1", "Preflight request has been made");
+          if (headers) {
+            var actualHeaders = resp.headers.get("x-control-request-headers").toLowerCase().split(",");
+            for (var i in actualHeaders)
+              actualHeaders[i] = actualHeaders[i].trim();
+            for (var header of headers)
+              assert_in_array(header[0].toLowerCase(), actualHeaders, "Preflight asked permission for header: " + header);
+
+            let accessControlAllowHeaders = headerNames(headers).sort().join(",");
+            assert_equals(resp.headers.get("x-control-request-headers"), accessControlAllowHeaders, "Access-Control-Allow-Headers value");
+            return fetch(RESOURCES_DIR + "clean-stash.py?token=" + uuid_token);
+          } else {
+            assert_equals(resp.headers.get("x-control-request-headers"), null, "Access-Control-Request-Headers should be omitted")
+          }
+        });
+      } else {
+        return promise_rejects_js(test, TypeError, fetch(url + urlParameters, requestInit)).then(function(){
+          return fetch(RESOURCES_DIR + "clean-stash.py?token=" + uuid_token);
+        });
+      }
+    });
+  }, desc);
+}
diff --git a/test/wpt/tests/fetch/api/cors/resources/not-cors-safelisted.json b/test/wpt/tests/fetch/api/cors/resources/not-cors-safelisted.json
new file mode 100644
index 00000000000..945dc0f93ba
--- /dev/null
+++ b/test/wpt/tests/fetch/api/cors/resources/not-cors-safelisted.json
@@ -0,0 +1,13 @@
+[
+  ["accept", "\""],
+  ["accept", "012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678"],
+  ["accept-language", "\u0001"],
+  ["accept-language", "@"],
+  ["authorization", "basics"],
+  ["content-language", "\u0001"],
+  ["content-language", "@"],
+  ["content-type", "text/html"],
+  ["content-type", "text/plain; long=0123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901"],
+  ["range", "bytes 0-"],
+  ["test", "hi"]
+]
diff --git a/test/wpt/tests/fetch/api/cors/sandboxed-iframe.html b/test/wpt/tests/fetch/api/cors/sandboxed-iframe.html
new file mode 100644
index 00000000000..feb9f1f2e5b
--- /dev/null
+++ b/test/wpt/tests/fetch/api/cors/sandboxed-iframe.html
@@ -0,0 +1,14 @@
+<!doctype html>
+<html>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<iframe sandbox="allow-scripts" src="../resources/sandboxed-iframe.html"></iframe>
+<script>
+promise_test(async (t) => {
+  const message = await new Promise((resolve) => {
+    window.addEventListener('message', e => resolve(e.data));
+  });
+  assert_equals(message, 'PASS');
+}, 'CORS with sandboxed iframe');
+</script>
+</html>
diff --git a/test/wpt/tests/fetch/api/crashtests/request.html b/test/wpt/tests/fetch/api/crashtests/request.html
new file mode 100644
index 00000000000..2d21930c3bb
--- /dev/null
+++ b/test/wpt/tests/fetch/api/crashtests/request.html
@@ -0,0 +1,8 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<script src="/common/utils.js"></script>
+<script>
+  // Cycle collection test for a case where the Request object is alive and accessible globally.
+  var req = new Request(`/`);
+  fetch(req)
+</script>
diff --git a/test/wpt/tests/fetch/api/credentials/authentication-basic.any.js b/test/wpt/tests/fetch/api/credentials/authentication-basic.any.js
new file mode 100644
index 00000000000..31ccc386977
--- /dev/null
+++ b/test/wpt/tests/fetch/api/credentials/authentication-basic.any.js
@@ -0,0 +1,17 @@
+// META: global=window,worker
+
+function basicAuth(desc, user, pass, mode, status) {
+  promise_test(function(test) {
+    var headers = { "Authorization": "Basic " + btoa(user + ":" + pass)};
+    var requestInit = {"credentials": mode, "headers": headers};
+    return fetch("../resources/authentication.py?realm=test", requestInit).then(function(resp) {
+        assert_equals(resp.status, status, "HTTP status is " + status);
+        assert_equals(resp.type , "basic", "Response's type is basic");
+    });
+  }, desc);
+}
+
+basicAuth("User-added Authorization header with include mode", "user", "password", "include", 200);
+basicAuth("User-added Authorization header with same-origin mode", "user", "password", "same-origin", 200);
+basicAuth("User-added Authorization header with omit mode", "user", "password", "omit", 200);
+basicAuth("User-added bogus Authorization header with omit mode", "notuser", "notpassword", "omit", 401);
diff --git a/test/wpt/tests/fetch/api/credentials/authentication-redirection.any.js b/test/wpt/tests/fetch/api/credentials/authentication-redirection.any.js
index b6376368116..16656b5435a 100644
--- a/test/wpt/tests/fetch/api/credentials/authentication-redirection.any.js
+++ b/test/wpt/tests/fetch/api/credentials/authentication-redirection.any.js
@@ -16,11 +16,14 @@ promise_test(async test => {
 }, "getAuthorizationHeaderValue - no redirection");
 
 promise_test(async test => {
-  const result = await getAuthorizationHeaderValue("/fetch/api/resources/redirect.py?location=" + encodeURIComponent("/fetch/api/resources/dump-authorization-header.py"));
+  result = await getAuthorizationHeaderValue("/fetch/api/resources/redirect.py?location=" + encodeURIComponent("/fetch/api/resources/dump-authorization-header.py"));
+  assert_equals(result, authorizationValue);
+
+  result = await getAuthorizationHeaderValue(get_host_info().HTTPS_REMOTE_ORIGIN + "/fetch/api/resources/redirect.py?allow_headers=Authorization&location=" + encodeURIComponent(get_host_info().HTTPS_REMOTE_ORIGIN + "/fetch/api/resources/dump-authorization-header.py"));
   assert_equals(result, authorizationValue);
 }, "getAuthorizationHeaderValue - same origin redirection");
 
 promise_test(async (test) => {
-  const result = await getAuthorizationHeaderValue(get_host_info().HTTP_REMOTE_ORIGIN + "/fetch/api/resources/redirect.py?allow_headers=Authorization&location=" + encodeURIComponent(get_host_info().HTTP_ORIGIN + "/fetch/api/resources/dump-authorization-header.py"));
+  const result = await getAuthorizationHeaderValue(get_host_info().HTTPS_REMOTE_ORIGIN + "/fetch/api/resources/redirect.py?allow_headers=Authorization&location=" + encodeURIComponent(get_host_info().HTTPS_ORIGIN + "/fetch/api/resources/dump-authorization-header.py"));
   assert_equals(result, "none");
 }, "getAuthorizationHeaderValue - cross origin redirection");
diff --git a/test/wpt/tests/fetch/api/credentials/cookies.any.js b/test/wpt/tests/fetch/api/credentials/cookies.any.js
new file mode 100644
index 00000000000..de30e477655
--- /dev/null
+++ b/test/wpt/tests/fetch/api/credentials/cookies.any.js
@@ -0,0 +1,49 @@
+// META: global=window,worker
+// META: script=../resources/utils.js
+
+function cookies(desc, credentials1, credentials2 ,cookies) {
+  var url = RESOURCES_DIR + "top.txt"
+  var urlParameters = "";
+  var urlCleanParameters = "";
+  if (cookies) {
+    urlParameters +="?pipe=header(Set-Cookie,";
+    urlParameters += cookies.join(",True)|header(Set-Cookie,") +  ",True)";
+    urlCleanParameters +="?pipe=header(Set-Cookie,";
+    urlCleanParameters +=  cookies.join("%3B%20max-age=0,True)|header(Set-Cookie,") +  "%3B%20max-age=0,True)";
+  }
+
+  var requestInit = {"credentials": credentials1}
+  promise_test(function(test){
+    var requestInit = {"credentials": credentials1}
+    return fetch(url + urlParameters, requestInit).then(function(resp) {
+      assert_equals(resp.status, 200, "HTTP status is 200");
+      assert_equals(resp.type , "basic", "Response's type is basic");
+      //check cookies sent
+      return fetch(RESOURCES_DIR + "inspect-headers.py?headers=cookie" , {"credentials": credentials2});
+    }).then(function(resp) {
+      assert_equals(resp.status, 200, "HTTP status is 200");
+      assert_equals(resp.type , "basic", "Response's type is basic");
+      assert_false(resp.headers.has("Cookie") , "Cookie header is not exposed in response");
+      if (credentials1 != "omit" && credentials2 != "omit") {
+        assert_equals(resp.headers.get("x-request-cookie") , cookies.join("; "), "Request include cookie(s)");
+      }
+      else {
+        assert_false(resp.headers.has("x-request-cookie") , "Request does not have cookie(s)");
+      }
+      //clean cookies
+      return fetch(url + urlCleanParameters, {"credentials": "include"});
+    }).catch(function(e) {
+      return fetch(url + urlCleanParameters, {"credentials": "include"}).then(function() {
+         return Promise.reject(e);
+      });
+    });
+  }, desc);
+}
+
+cookies("Include mode: 1 cookie", "include", "include", ["a=1"]);
+cookies("Include mode: 2 cookies", "include", "include", ["b=2", "c=3"]);
+cookies("Omit mode: discard cookies", "omit", "omit", ["d=4"]);
+cookies("Omit mode: no cookie is stored", "omit", "include", ["e=5"]);
+cookies("Omit mode: no cookie is sent", "include", "omit", ["f=6"]);
+cookies("Same-origin mode: 1 cookie", "same-origin", "same-origin", ["a=1"]);
+cookies("Same-origin mode: 2 cookies", "same-origin", "same-origin", ["b=2", "c=3"]);
diff --git a/test/wpt/tests/fetch/api/headers/header-setcookie.any.js b/test/wpt/tests/fetch/api/headers/header-setcookie.any.js
new file mode 100644
index 00000000000..cafb780c2c7
--- /dev/null
+++ b/test/wpt/tests/fetch/api/headers/header-setcookie.any.js
@@ -0,0 +1,266 @@
+// META: title=Headers set-cookie special cases
+// META: global=window,worker
+
+const headerList = [
+  ["set-cookie", "foo=bar"],
+  ["Set-Cookie", "fizz=buzz; domain=example.com"],
+];
+
+const setCookie2HeaderList = [
+  ["set-cookie2", "foo2=bar2"],
+  ["Set-Cookie2", "fizz2=buzz2; domain=example2.com"],
+];
+
+function assert_nested_array_equals(actual, expected) {
+  assert_equals(actual.length, expected.length, "Array length is not equal");
+  for (let i = 0; i < expected.length; i++) {
+    assert_array_equals(actual[i], expected[i]);
+  }
+}
+
+test(function () {
+  const headers = new Headers(headerList);
+  assert_equals(
+    headers.get("set-cookie"),
+    "foo=bar, fizz=buzz; domain=example.com",
+  );
+}, "Headers.prototype.get combines set-cookie headers in order");
+
+test(function () {
+  const headers = new Headers(headerList);
+  const list = [...headers];
+  assert_nested_array_equals(list, [
+    ["set-cookie", "foo=bar"],
+    ["set-cookie", "fizz=buzz; domain=example.com"],
+  ]);
+}, "Headers iterator does not combine set-cookie headers");
+
+test(function () {
+  const headers = new Headers(setCookie2HeaderList);
+  const list = [...headers];
+  assert_nested_array_equals(list, [
+    ["set-cookie2", "foo2=bar2, fizz2=buzz2; domain=example2.com"],
+  ]);
+}, "Headers iterator does not special case set-cookie2 headers");
+
+test(function () {
+  const headers = new Headers([...headerList, ...setCookie2HeaderList]);
+  const list = [...headers];
+  assert_nested_array_equals(list, [
+    ["set-cookie", "foo=bar"],
+    ["set-cookie", "fizz=buzz; domain=example.com"],
+    ["set-cookie2", "foo2=bar2, fizz2=buzz2; domain=example2.com"],
+  ]);
+}, "Headers iterator does not combine set-cookie & set-cookie2 headers");
+
+test(function () {
+  // Values are in non alphabetic order, and the iterator should yield in the
+  // headers in the exact order of the input.
+  const headers = new Headers([
+    ["set-cookie", "z=z"],
+    ["set-cookie", "a=a"],
+    ["set-cookie", "n=n"],
+  ]);
+  const list = [...headers];
+  assert_nested_array_equals(list, [
+    ["set-cookie", "z=z"],
+    ["set-cookie", "a=a"],
+    ["set-cookie", "n=n"],
+  ]);
+}, "Headers iterator preserves set-cookie ordering");
+
+test(
+  function () {
+    const headers = new Headers([
+      ["xylophone-header", "1"],
+      ["best-header", "2"],
+      ["set-cookie", "3"],
+      ["a-cool-header", "4"],
+      ["set-cookie", "5"],
+      ["a-cool-header", "6"],
+      ["best-header", "7"],
+    ]);
+    const list = [...headers];
+    assert_nested_array_equals(list, [
+      ["a-cool-header", "4, 6"],
+      ["best-header", "2, 7"],
+      ["set-cookie", "3"],
+      ["set-cookie", "5"],
+      ["xylophone-header", "1"],
+    ]);
+  },
+  "Headers iterator preserves per header ordering, but sorts keys alphabetically",
+);
+
+test(
+  function () {
+    const headers = new Headers([
+      ["xylophone-header", "7"],
+      ["best-header", "6"],
+      ["set-cookie", "5"],
+      ["a-cool-header", "4"],
+      ["set-cookie", "3"],
+      ["a-cool-header", "2"],
+      ["best-header", "1"],
+    ]);
+    const list = [...headers];
+    assert_nested_array_equals(list, [
+      ["a-cool-header", "4, 2"],
+      ["best-header", "6, 1"],
+      ["set-cookie", "5"],
+      ["set-cookie", "3"],
+      ["xylophone-header", "7"],
+    ]);
+  },
+  "Headers iterator preserves per header ordering, but sorts keys alphabetically (and ignores value ordering)",
+);
+
+test(function () {
+  const headers = new Headers([["fizz", "buzz"], ["X-Header", "test"]]);
+  const iterator = headers[Symbol.iterator]();
+  assert_array_equals(iterator.next().value, ["fizz", "buzz"]);
+  headers.append("Set-Cookie", "a=b");
+  assert_array_equals(iterator.next().value, ["set-cookie", "a=b"]);
+  headers.append("Accept", "text/html");
+  assert_array_equals(iterator.next().value, ["set-cookie", "a=b"]);
+  assert_array_equals(iterator.next().value, ["x-header", "test"]);
+  headers.append("set-cookie", "c=d");
+  assert_array_equals(iterator.next().value, ["x-header", "test"]);
+  assert_true(iterator.next().done);
+}, "Headers iterator is correctly updated with set-cookie changes");
+
+test(function () {
+  const headers = new Headers([
+    ["set-cookie", "a"],
+    ["set-cookie", "b"],
+    ["set-cookie", "c"]
+  ]);
+  const iterator = headers[Symbol.iterator]();
+  assert_array_equals(iterator.next().value, ["set-cookie", "a"]);
+  headers.delete("set-cookie");
+  headers.append("set-cookie", "d");
+  headers.append("set-cookie", "e");
+  headers.append("set-cookie", "f");
+  assert_array_equals(iterator.next().value, ["set-cookie", "e"]);
+  assert_array_equals(iterator.next().value, ["set-cookie", "f"]);
+  assert_true(iterator.next().done);
+}, "Headers iterator is correctly updated with set-cookie changes #2");
+
+test(function () {
+  const headers = new Headers(headerList);
+  assert_true(headers.has("sEt-cOoKiE"));
+}, "Headers.prototype.has works for set-cookie");
+
+test(function () {
+  const headers = new Headers(setCookie2HeaderList);
+  headers.append("set-Cookie", "foo=bar");
+  headers.append("sEt-cOoKiE", "fizz=buzz");
+  const list = [...headers];
+  assert_nested_array_equals(list, [
+    ["set-cookie", "foo=bar"],
+    ["set-cookie", "fizz=buzz"],
+    ["set-cookie2", "foo2=bar2, fizz2=buzz2; domain=example2.com"],
+  ]);
+}, "Headers.prototype.append works for set-cookie");
+
+test(function () {
+  const headers = new Headers(headerList);
+  headers.set("set-cookie", "foo2=bar2");
+  const list = [...headers];
+  assert_nested_array_equals(list, [
+    ["set-cookie", "foo2=bar2"],
+  ]);
+}, "Headers.prototype.set works for set-cookie");
+
+test(function () {
+  const headers = new Headers(headerList);
+  headers.delete("set-Cookie");
+  const list = [...headers];
+  assert_nested_array_equals(list, []);
+}, "Headers.prototype.delete works for set-cookie");
+
+test(function () {
+  const headers = new Headers();
+  assert_array_equals(headers.getSetCookie(), []);
+}, "Headers.prototype.getSetCookie with no headers present");
+
+test(function () {
+  const headers = new Headers([headerList[0]]);
+  assert_array_equals(headers.getSetCookie(), ["foo=bar"]);
+}, "Headers.prototype.getSetCookie with one header");
+
+test(function () {
+  const headers = new Headers({ "Set-Cookie": "foo=bar" });
+  assert_array_equals(headers.getSetCookie(), ["foo=bar"]);
+}, "Headers.prototype.getSetCookie with one header created from an object");
+
+test(function () {
+  const headers = new Headers(headerList);
+  assert_array_equals(headers.getSetCookie(), [
+    "foo=bar",
+    "fizz=buzz; domain=example.com",
+  ]);
+}, "Headers.prototype.getSetCookie with multiple headers");
+
+test(function () {
+  const headers = new Headers([["set-cookie", ""]]);
+  assert_array_equals(headers.getSetCookie(), [""]);
+}, "Headers.prototype.getSetCookie with an empty header");
+
+test(function () {
+  const headers = new Headers([["set-cookie", "x"], ["set-cookie", "x"]]);
+  assert_array_equals(headers.getSetCookie(), ["x", "x"]);
+}, "Headers.prototype.getSetCookie with two equal headers");
+
+test(function () {
+  const headers = new Headers([
+    ["set-cookie2", "x"],
+    ["set-cookie", "y"],
+    ["set-cookie2", "z"],
+  ]);
+  assert_array_equals(headers.getSetCookie(), ["y"]);
+}, "Headers.prototype.getSetCookie ignores set-cookie2 headers");
+
+test(function () {
+  // Values are in non alphabetic order, and the iterator should yield in the
+  // headers in the exact order of the input.
+  const headers = new Headers([
+    ["set-cookie", "z=z"],
+    ["set-cookie", "a=a"],
+    ["set-cookie", "n=n"],
+  ]);
+  assert_array_equals(headers.getSetCookie(), ["z=z", "a=a", "n=n"]);
+}, "Headers.prototype.getSetCookie preserves header ordering");
+
+test(function () {
+  const headers = new Headers({"Set-Cookie": "  a=b\n"});
+  headers.append("set-cookie", "\n\rc=d  ");
+  assert_nested_array_equals([...headers], [
+    ["set-cookie", "a=b"],
+    ["set-cookie", "c=d"]
+  ]);
+  headers.set("set-cookie", "\te=f ");
+  assert_nested_array_equals([...headers], [["set-cookie", "e=f"]]);
+}, "Adding Set-Cookie headers normalizes their value");
+
+test(function () {
+  assert_throws_js(TypeError, () => {
+    new Headers({"set-cookie": "\0"});
+  });
+
+  const headers = new Headers();
+  assert_throws_js(TypeError, () => {
+    headers.append("Set-Cookie", "a\nb");
+  });
+  assert_throws_js(TypeError, () => {
+    headers.set("Set-Cookie", "a\rb");
+  });
+}, "Adding invalid Set-Cookie headers throws");
+
+test(function () {
+  const response = new Response();
+  response.headers.append("Set-Cookie", "foo=bar");
+  assert_array_equals(response.headers.getSetCookie(), []);
+  response.headers.append("sEt-cOokIe", "bar=baz");
+  assert_array_equals(response.headers.getSetCookie(), []);
+}, "Set-Cookie is a forbidden response header");
diff --git a/test/wpt/tests/fetch/api/headers/headers-no-cors.any.js b/test/wpt/tests/fetch/api/headers/headers-no-cors.any.js
new file mode 100644
index 00000000000..60dbb9ef67a
--- /dev/null
+++ b/test/wpt/tests/fetch/api/headers/headers-no-cors.any.js
@@ -0,0 +1,59 @@
+// META: global=window,worker
+
+"use strict";
+
+promise_test(() => fetch("../cors/resources/not-cors-safelisted.json").then(res => res.json().then(runTests)), "Loading data…");
+
+const longValue = "s".repeat(127);
+
+[
+  {
+    "headers": ["accept", "accept-language", "content-language"],
+    "values": [longValue, "", longValue]
+  },
+  {
+    "headers": ["accept", "accept-language", "content-language"],
+    "values": ["", longValue]
+  },
+  {
+    "headers": ["content-type"],
+    "values": ["text/plain;" + "s".repeat(116), "text/plain"]
+  }
+].forEach(testItem => {
+  testItem.headers.forEach(header => {
+    test(() => {
+      const noCorsHeaders = new Request("about:blank", { mode: "no-cors" }).headers;
+      testItem.values.forEach((value) => {
+        noCorsHeaders.append(header, value);
+        assert_equals(noCorsHeaders.get(header), testItem.values[0], '1');
+      });
+      noCorsHeaders.set(header, testItem.values.join(", "));
+      assert_equals(noCorsHeaders.get(header), testItem.values[0], '2');
+      noCorsHeaders.delete(header);
+      assert_false(noCorsHeaders.has(header));
+    }, "\"no-cors\" Headers object cannot have " + header + " set to " + testItem.values.join(", "));
+  });
+});
+
+function runTests(testArray) {
+  testArray = testArray.concat([
+    ["dpr", "2"],
+    ["rtt", "1.0"],
+    ["downlink", "-1.0"],
+    ["ect", "6g"],
+    ["save-data", "on"],
+    ["viewport-width", "100"],
+    ["width", "100"],
+    ["unknown", "doesitmatter"]
+  ]);
+  testArray.forEach(testItem => {
+    const [headerName, headerValue] = testItem;
+    test(() => {
+      const noCorsHeaders = new Request("about:blank", { mode: "no-cors" }).headers;
+      noCorsHeaders.append(headerName, headerValue);
+      assert_false(noCorsHeaders.has(headerName));
+      noCorsHeaders.set(headerName, headerValue);
+      assert_false(noCorsHeaders.has(headerName));
+    }, "\"no-cors\" Headers object cannot have " + headerName + "/" + headerValue + " as header");
+  });
+}
diff --git a/test/wpt/tests/fetch/api/policies/csp-blocked-worker.html b/test/wpt/tests/fetch/api/policies/csp-blocked-worker.html
new file mode 100644
index 00000000000..e8660dffa94
--- /dev/null
+++ b/test/wpt/tests/fetch/api/policies/csp-blocked-worker.html
@@ -0,0 +1,16 @@
+<!doctype html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>Fetch in worker: blocked by CSP</title>
+    <meta name="help" href="https://fetch.spec.whatwg.org/#main-fetch">
+    <meta name="author" title="Canon Research France" href="https://www.crf.canon.fr">
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+  </head>
+  <body>
+    <script>
+      fetch_tests_from_worker(new Worker("csp-blocked.js"));
+    </script>
+  </body>
+</html>
\ No newline at end of file
diff --git a/test/wpt/tests/fetch/api/policies/csp-blocked.html b/test/wpt/tests/fetch/api/policies/csp-blocked.html
new file mode 100644
index 00000000000..99e90dfcd8f
--- /dev/null
+++ b/test/wpt/tests/fetch/api/policies/csp-blocked.html
@@ -0,0 +1,15 @@
+<!doctype html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>Fetch: blocked by CSP</title>
+    <meta name="help" href="https://fetch.spec.whatwg.org/#main-fetch">
+    <meta name="author" title="Canon Research France" href="https://www.crf.canon.fr">
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+  </head>
+  <body>
+    <script src="../resources/utils.js"></script>
+    <script src="csp-blocked.js"></script>
+  </body>
+</html>
\ No newline at end of file
diff --git a/test/wpt/tests/fetch/api/policies/csp-blocked.html.headers b/test/wpt/tests/fetch/api/policies/csp-blocked.html.headers
new file mode 100644
index 00000000000..c8c1e9ffbd9
--- /dev/null
+++ b/test/wpt/tests/fetch/api/policies/csp-blocked.html.headers
@@ -0,0 +1 @@
+Content-Security-Policy: connect-src 'none';
\ No newline at end of file
diff --git a/test/wpt/tests/fetch/api/policies/csp-blocked.js b/test/wpt/tests/fetch/api/policies/csp-blocked.js
new file mode 100644
index 00000000000..28653fff85c
--- /dev/null
+++ b/test/wpt/tests/fetch/api/policies/csp-blocked.js
@@ -0,0 +1,13 @@
+if (this.document === undefined) {
+  importScripts("/resources/testharness.js");
+  importScripts("../resources/utils.js");
+}
+
+//Content-Security-Policy: connect-src 'none'; cf .headers file
+cspViolationUrl = RESOURCES_DIR + "top.txt";
+
+promise_test(function(test) {
+  return promise_rejects_js(test, TypeError, fetch(cspViolationUrl));
+}, "Fetch is blocked by CSP, got a TypeError");
+
+done();
diff --git a/test/wpt/tests/fetch/api/policies/csp-blocked.js.headers b/test/wpt/tests/fetch/api/policies/csp-blocked.js.headers
new file mode 100644
index 00000000000..c8c1e9ffbd9
--- /dev/null
+++ b/test/wpt/tests/fetch/api/policies/csp-blocked.js.headers
@@ -0,0 +1 @@
+Content-Security-Policy: connect-src 'none';
\ No newline at end of file
diff --git a/test/wpt/tests/fetch/api/policies/nested-policy.js b/test/wpt/tests/fetch/api/policies/nested-policy.js
new file mode 100644
index 00000000000..b0d17696c33
--- /dev/null
+++ b/test/wpt/tests/fetch/api/policies/nested-policy.js
@@ -0,0 +1 @@
+// empty, but referrer-policy set on this file
diff --git a/test/wpt/tests/fetch/api/policies/nested-policy.js.headers b/test/wpt/tests/fetch/api/policies/nested-policy.js.headers
new file mode 100644
index 00000000000..7ffbf17d6be
--- /dev/null
+++ b/test/wpt/tests/fetch/api/policies/nested-policy.js.headers
@@ -0,0 +1 @@
+Referrer-Policy: no-referrer
diff --git a/test/wpt/tests/fetch/api/policies/referrer-no-referrer-service-worker.https.html b/test/wpt/tests/fetch/api/policies/referrer-no-referrer-service-worker.https.html
new file mode 100644
index 00000000000..af898aa29f5
--- /dev/null
+++ b/test/wpt/tests/fetch/api/policies/referrer-no-referrer-service-worker.https.html
@@ -0,0 +1,18 @@
+<!doctype html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>Fetch in service worker: referrer with no-referrer policy</title>
+    <meta name="help" href="https://fetch.spec.whatwg.org/#main-fetch">
+    <meta name="help" href="https://fetch.spec.whatwg.org/#http-network-or-cache-fetch">
+    <meta name="author" title="Canon Research France" href="https://www.crf.canon.fr">
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <script src="/service-workers/service-worker/resources/test-helpers.sub.js"></script>
+  </head>
+  <body>
+    <script>
+      service_worker_test("referrer-no-referrer.js");
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/fetch/api/policies/referrer-no-referrer-worker.html b/test/wpt/tests/fetch/api/policies/referrer-no-referrer-worker.html
new file mode 100644
index 00000000000..dbef9bb658f
--- /dev/null
+++ b/test/wpt/tests/fetch/api/policies/referrer-no-referrer-worker.html
@@ -0,0 +1,17 @@
+<!doctype html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>Fetch in worker: referrer with no-referrer policy</title>
+    <meta name="help" href="https://fetch.spec.whatwg.org/#main-fetch">
+    <meta name="help" href="https://fetch.spec.whatwg.org/#http-network-or-cache-fetch">
+    <meta name="author" title="Canon Research France" href="https://www.crf.canon.fr">
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+  </head>
+  <body>
+    <script>
+      fetch_tests_from_worker(new Worker("referrer-no-referrer.js"));
+    </script>
+  </body>
+</html>
\ No newline at end of file
diff --git a/test/wpt/tests/fetch/api/policies/referrer-no-referrer.html b/test/wpt/tests/fetch/api/policies/referrer-no-referrer.html
new file mode 100644
index 00000000000..22a6f34c525
--- /dev/null
+++ b/test/wpt/tests/fetch/api/policies/referrer-no-referrer.html
@@ -0,0 +1,15 @@
+<!doctype html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>Fetch: referrer with no-referrer policy</title>
+    <meta name="help" href="https://fetch.spec.whatwg.org/#main-fetch">
+    <meta name="author" title="Canon Research France" href="https://www.crf.canon.fr">
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+  </head>
+  <body>
+    <script src="../resources/utils.js"></script>
+    <script src="referrer-no-referrer.js"></script>
+  </body>
+</html>
\ No newline at end of file
diff --git a/test/wpt/tests/fetch/api/policies/referrer-no-referrer.html.headers b/test/wpt/tests/fetch/api/policies/referrer-no-referrer.html.headers
new file mode 100644
index 00000000000..7ffbf17d6be
--- /dev/null
+++ b/test/wpt/tests/fetch/api/policies/referrer-no-referrer.html.headers
@@ -0,0 +1 @@
+Referrer-Policy: no-referrer
diff --git a/test/wpt/tests/fetch/api/policies/referrer-no-referrer.js b/test/wpt/tests/fetch/api/policies/referrer-no-referrer.js
new file mode 100644
index 00000000000..60600bf081c
--- /dev/null
+++ b/test/wpt/tests/fetch/api/policies/referrer-no-referrer.js
@@ -0,0 +1,19 @@
+if (this.document === undefined) {
+  importScripts("/resources/testharness.js");
+  importScripts("../resources/utils.js");
+}
+
+var fetchedUrl = RESOURCES_DIR + "inspect-headers.py?headers=origin";
+
+promise_test(function(test) {
+  return fetch(fetchedUrl).then(function(resp) {
+    assert_equals(resp.status, 200, "HTTP status is 200");
+    assert_equals(resp.type , "basic", "Response's type is basic");
+    var referrer = resp.headers.get("x-request-referer");
+    //Either no referrer header is sent or it is empty
+    if (referrer)
+      assert_equals(referrer, "", "request's referrer is empty");
+  });
+}, "Request's referrer is empty");
+
+done();
diff --git a/test/wpt/tests/fetch/api/policies/referrer-no-referrer.js.headers b/test/wpt/tests/fetch/api/policies/referrer-no-referrer.js.headers
new file mode 100644
index 00000000000..7ffbf17d6be
--- /dev/null
+++ b/test/wpt/tests/fetch/api/policies/referrer-no-referrer.js.headers
@@ -0,0 +1 @@
+Referrer-Policy: no-referrer
diff --git a/test/wpt/tests/fetch/api/policies/referrer-origin-service-worker.https.html b/test/wpt/tests/fetch/api/policies/referrer-origin-service-worker.https.html
new file mode 100644
index 00000000000..4018b837816
--- /dev/null
+++ b/test/wpt/tests/fetch/api/policies/referrer-origin-service-worker.https.html
@@ -0,0 +1,18 @@
+<!doctype html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>Fetch in service worker: referrer with no-referrer policy</title>
+    <meta name="help" href="https://fetch.spec.whatwg.org/#main-fetch">
+    <meta name="help" href="https://fetch.spec.whatwg.org/#http-network-or-cache-fetch">
+    <meta name="author" title="Canon Research France" href="https://www.crf.canon.fr">
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <script src="/service-workers/service-worker/resources/test-helpers.sub.js"></script>
+  </head>
+  <body>
+    <script>
+      service_worker_test("referrer-origin.js?pipe=sub");
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/fetch/api/policies/referrer-origin-when-cross-origin-service-worker.https.html b/test/wpt/tests/fetch/api/policies/referrer-origin-when-cross-origin-service-worker.https.html
new file mode 100644
index 00000000000..d87192e2271
--- /dev/null
+++ b/test/wpt/tests/fetch/api/policies/referrer-origin-when-cross-origin-service-worker.https.html
@@ -0,0 +1,17 @@
+<!doctype html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>Fetch in service worker: referrer with origin-when-cross-origin policy</title>
+    <meta name="help" href="https://fetch.spec.whatwg.org/#main-fetch">
+    <meta name="help" href="https://fetch.spec.whatwg.org/#http-network-or-cache-fetch">
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <script src="/service-workers/service-worker/resources/test-helpers.sub.js"></script>
+  </head>
+  <body>
+    <script>
+      service_worker_test("referrer-origin-when-cross-origin.js?pipe=sub");
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/fetch/api/policies/referrer-origin-when-cross-origin-worker.html b/test/wpt/tests/fetch/api/policies/referrer-origin-when-cross-origin-worker.html
new file mode 100644
index 00000000000..f95ae8cf081
--- /dev/null
+++ b/test/wpt/tests/fetch/api/policies/referrer-origin-when-cross-origin-worker.html
@@ -0,0 +1,16 @@
+<!doctype html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>Fetch in worker: referrer with origin-when-cross-origin policy</title>
+    <meta name="help" href="https://fetch.spec.whatwg.org/#main-fetch">
+    <meta name="help" href="https://fetch.spec.whatwg.org/#http-network-or-cache-fetch">
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+  </head>
+  <body>
+    <script>
+      fetch_tests_from_worker(new Worker("referrer-origin-when-cross-origin.js?pipe=sub"));
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/fetch/api/policies/referrer-origin-when-cross-origin.html b/test/wpt/tests/fetch/api/policies/referrer-origin-when-cross-origin.html
new file mode 100644
index 00000000000..5cd79e4b536
--- /dev/null
+++ b/test/wpt/tests/fetch/api/policies/referrer-origin-when-cross-origin.html
@@ -0,0 +1,16 @@
+<!doctype html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>Fetch: referrer with origin-when-cross-origin policy</title>
+    <meta name="help" href="https://fetch.spec.whatwg.org/#main-fetch">
+    <meta name="help" href="https://fetch.spec.whatwg.org/#http-network-or-cache-fetch">
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <script src="/common/get-host-info.sub.js"></script>
+  </head>
+  <body>
+    <script src="../resources/utils.js"></script>
+    <script src="referrer-origin-when-cross-origin.js?pipe=sub"></script>
+  </body>
+</html>
diff --git a/test/wpt/tests/fetch/api/policies/referrer-origin-when-cross-origin.html.headers b/test/wpt/tests/fetch/api/policies/referrer-origin-when-cross-origin.html.headers
new file mode 100644
index 00000000000..ad768e63294
--- /dev/null
+++ b/test/wpt/tests/fetch/api/policies/referrer-origin-when-cross-origin.html.headers
@@ -0,0 +1 @@
+Referrer-Policy: origin-when-cross-origin
diff --git a/test/wpt/tests/fetch/api/policies/referrer-origin-when-cross-origin.js b/test/wpt/tests/fetch/api/policies/referrer-origin-when-cross-origin.js
new file mode 100644
index 00000000000..0adadbc5508
--- /dev/null
+++ b/test/wpt/tests/fetch/api/policies/referrer-origin-when-cross-origin.js
@@ -0,0 +1,21 @@
+if (this.document === undefined) {
+  importScripts("/resources/testharness.js");
+  importScripts("../resources/utils.js");
+  importScripts("/common/get-host-info.sub.js");
+
+  // A nested importScripts() with a referrer-policy should have no effect
+  // on overall worker policy.
+  importScripts("nested-policy.js");
+}
+
+var referrerOrigin = location.origin + '/';
+var fetchedUrl = get_host_info().HTTP_REMOTE_ORIGIN + dirname(location.pathname) + RESOURCES_DIR + "inspect-headers.py?cors&headers=referer";
+
+promise_test(function(test) {
+  return fetch(fetchedUrl).then(function(resp) {
+    assert_equals(resp.status, 200, "HTTP status is 200");
+    assert_equals(resp.headers.get("x-request-referer"), referrerOrigin, "request's referrer is " + referrerOrigin);
+  });
+}, "Request's referrer is origin");
+
+done();
diff --git a/test/wpt/tests/fetch/api/policies/referrer-origin-when-cross-origin.js.headers b/test/wpt/tests/fetch/api/policies/referrer-origin-when-cross-origin.js.headers
new file mode 100644
index 00000000000..ad768e63294
--- /dev/null
+++ b/test/wpt/tests/fetch/api/policies/referrer-origin-when-cross-origin.js.headers
@@ -0,0 +1 @@
+Referrer-Policy: origin-when-cross-origin
diff --git a/test/wpt/tests/fetch/api/policies/referrer-origin-worker.html b/test/wpt/tests/fetch/api/policies/referrer-origin-worker.html
new file mode 100644
index 00000000000..bb80dd54fbf
--- /dev/null
+++ b/test/wpt/tests/fetch/api/policies/referrer-origin-worker.html
@@ -0,0 +1,17 @@
+<!doctype html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>Fetch in worker: referrer with origin policy</title>
+    <meta name="help" href="https://fetch.spec.whatwg.org/#main-fetch">
+    <meta name="help" href="https://fetch.spec.whatwg.org/#http-network-or-cache-fetch">
+    <meta name="author" title="Canon Research France" href="https://www.crf.canon.fr">
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+  </head>
+  <body>
+    <script>
+      fetch_tests_from_worker(new Worker("referrer-origin.js?pipe=sub"));
+    </script>
+  </body>
+</html>
\ No newline at end of file
diff --git a/test/wpt/tests/fetch/api/policies/referrer-origin.html b/test/wpt/tests/fetch/api/policies/referrer-origin.html
new file mode 100644
index 00000000000..b164afe01de
--- /dev/null
+++ b/test/wpt/tests/fetch/api/policies/referrer-origin.html
@@ -0,0 +1,16 @@
+<!doctype html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>Fetch: referrer with origin policy</title>
+    <meta name="help" href="https://fetch.spec.whatwg.org/#main-fetch">
+    <meta name="help" href="https://fetch.spec.whatwg.org/#http-network-or-cache-fetch">
+    <meta name="author" title="Canon Research France" href="https://www.crf.canon.fr">
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+  </head>
+  <body>
+    <script src="../resources/utils.js"></script>
+    <script src="referrer-origin.js?pipe=sub"></script>
+  </body>
+</html>
diff --git a/test/wpt/tests/fetch/api/policies/referrer-origin.html.headers b/test/wpt/tests/fetch/api/policies/referrer-origin.html.headers
new file mode 100644
index 00000000000..5b29739bbdd
--- /dev/null
+++ b/test/wpt/tests/fetch/api/policies/referrer-origin.html.headers
@@ -0,0 +1 @@
+Referrer-Policy: origin
diff --git a/test/wpt/tests/fetch/api/policies/referrer-origin.js b/test/wpt/tests/fetch/api/policies/referrer-origin.js
new file mode 100644
index 00000000000..918f8f207c3
--- /dev/null
+++ b/test/wpt/tests/fetch/api/policies/referrer-origin.js
@@ -0,0 +1,30 @@
+if (this.document === undefined) {
+  importScripts("/resources/testharness.js");
+  importScripts("../resources/utils.js");
+
+  // A nested importScripts() with a referrer-policy should have no effect
+  // on overall worker policy.
+  importScripts("nested-policy.js");
+}
+
+var referrerOrigin = (new URL("/", location.href)).href;
+var fetchedUrl = RESOURCES_DIR + "inspect-headers.py?headers=referer";
+
+promise_test(function(test) {
+  return fetch(fetchedUrl).then(function(resp) {
+    assert_equals(resp.status, 200, "HTTP status is 200");
+    assert_equals(resp.type , "basic", "Response's type is basic");
+    assert_equals(resp.headers.get("x-request-referer"), referrerOrigin, "request's referrer is " + referrerOrigin);
+  });
+}, "Request's referrer is origin");
+
+promise_test(function(test) {
+  var referrerUrl = "https://{{domains[www]}}:{{ports[https][0]}}/";
+  return fetch(fetchedUrl, { "referrer": referrerUrl }).then(function(resp) {
+    assert_equals(resp.status, 200, "HTTP status is 200");
+    assert_equals(resp.type , "basic", "Response's type is basic");
+    assert_equals(resp.headers.get("x-request-referer"), referrerOrigin, "request's referrer is " + referrerOrigin);
+  });
+}, "Cross-origin referrer is overridden by client origin");
+
+done();
diff --git a/test/wpt/tests/fetch/api/policies/referrer-origin.js.headers b/test/wpt/tests/fetch/api/policies/referrer-origin.js.headers
new file mode 100644
index 00000000000..5b29739bbdd
--- /dev/null
+++ b/test/wpt/tests/fetch/api/policies/referrer-origin.js.headers
@@ -0,0 +1 @@
+Referrer-Policy: origin
diff --git a/test/wpt/tests/fetch/api/policies/referrer-unsafe-url-service-worker.https.html b/test/wpt/tests/fetch/api/policies/referrer-unsafe-url-service-worker.https.html
new file mode 100644
index 00000000000..634877edae8
--- /dev/null
+++ b/test/wpt/tests/fetch/api/policies/referrer-unsafe-url-service-worker.https.html
@@ -0,0 +1,18 @@
+<!doctype html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>Fetch in worker: referrer with unsafe-url policy</title>
+    <meta name="help" href="https://fetch.spec.whatwg.org/#main-fetch">
+    <meta name="help" href="https://fetch.spec.whatwg.org/#http-network-or-cache-fetch">
+    <meta name="author" title="Canon Research France" href="https://www.crf.canon.fr">
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <script src="/service-workers/service-worker/resources/test-helpers.sub.js"></script>
+  </head>
+  <body>
+    <script>
+      service_worker_test("referrer-unsafe-url.js");
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/fetch/api/policies/referrer-unsafe-url-worker.html b/test/wpt/tests/fetch/api/policies/referrer-unsafe-url-worker.html
new file mode 100644
index 00000000000..42045776b12
--- /dev/null
+++ b/test/wpt/tests/fetch/api/policies/referrer-unsafe-url-worker.html
@@ -0,0 +1,17 @@
+<!doctype html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>Fetch in worker: referrer with unsafe-url policy</title>
+    <meta name="help" href="https://fetch.spec.whatwg.org/#main-fetch">
+    <meta name="help" href="https://fetch.spec.whatwg.org/#http-network-or-cache-fetch">
+    <meta name="author" title="Canon Research France" href="https://www.crf.canon.fr">
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+  </head>
+  <body>
+    <script>
+      fetch_tests_from_worker(new Worker("referrer-unsafe-url.js"));
+    </script>
+  </body>
+</html>
\ No newline at end of file
diff --git a/test/wpt/tests/fetch/api/policies/referrer-unsafe-url.html b/test/wpt/tests/fetch/api/policies/referrer-unsafe-url.html
new file mode 100644
index 00000000000..10dd79e3d35
--- /dev/null
+++ b/test/wpt/tests/fetch/api/policies/referrer-unsafe-url.html
@@ -0,0 +1,16 @@
+<!doctype html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>Fetch: referrer with unsafe-url policy</title>
+    <meta name="help" href="https://fetch.spec.whatwg.org/#main-fetch">
+    <meta name="help" href="https://fetch.spec.whatwg.org/#http-network-or-cache-fetch">
+    <meta name="author" title="Canon Research France" href="https://www.crf.canon.fr">
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+  </head>
+  <body>
+    <script src="../resources/utils.js"></script>
+    <script src="referrer-unsafe-url.js"></script>
+  </body>
+</html>
\ No newline at end of file
diff --git a/test/wpt/tests/fetch/api/policies/referrer-unsafe-url.html.headers b/test/wpt/tests/fetch/api/policies/referrer-unsafe-url.html.headers
new file mode 100644
index 00000000000..8e23770bd60
--- /dev/null
+++ b/test/wpt/tests/fetch/api/policies/referrer-unsafe-url.html.headers
@@ -0,0 +1 @@
+Referrer-Policy: unsafe-url
diff --git a/test/wpt/tests/fetch/api/policies/referrer-unsafe-url.js b/test/wpt/tests/fetch/api/policies/referrer-unsafe-url.js
new file mode 100644
index 00000000000..4d61172613e
--- /dev/null
+++ b/test/wpt/tests/fetch/api/policies/referrer-unsafe-url.js
@@ -0,0 +1,21 @@
+if (this.document === undefined) {
+  importScripts("/resources/testharness.js");
+  importScripts("../resources/utils.js");
+
+  // A nested importScripts() with a referrer-policy should have no effect
+  // on overall worker policy.
+  importScripts("nested-policy.js");
+}
+
+var referrerUrl = location.href;
+var fetchedUrl = RESOURCES_DIR + "inspect-headers.py?headers=referer";
+
+promise_test(function(test) {
+  return fetch(fetchedUrl).then(function(resp) {
+    assert_equals(resp.status, 200, "HTTP status is 200");
+    assert_equals(resp.type , "basic", "Response's type is basic");
+    assert_equals(resp.headers.get("x-request-referer"), referrerUrl, "request's referrer is " + referrerUrl);
+  });
+}, "Request's referrer is the full url of current document/worker");
+
+done();
diff --git a/test/wpt/tests/fetch/api/policies/referrer-unsafe-url.js.headers b/test/wpt/tests/fetch/api/policies/referrer-unsafe-url.js.headers
new file mode 100644
index 00000000000..8e23770bd60
--- /dev/null
+++ b/test/wpt/tests/fetch/api/policies/referrer-unsafe-url.js.headers
@@ -0,0 +1 @@
+Referrer-Policy: unsafe-url
diff --git a/test/wpt/tests/fetch/api/redirect/redirect-empty-location.any.js b/test/wpt/tests/fetch/api/redirect/redirect-empty-location.any.js
new file mode 100644
index 00000000000..487f4d42e92
--- /dev/null
+++ b/test/wpt/tests/fetch/api/redirect/redirect-empty-location.any.js
@@ -0,0 +1,21 @@
+// META: global=window,worker
+// META: script=../resources/utils.js
+
+// Tests receiving a redirect response with a Location header with an empty
+// value.
+
+const url = RESOURCES_DIR + 'redirect-empty-location.py';
+
+promise_test(t => {
+  return promise_rejects_js(t, TypeError, fetch(url, {redirect:'follow'}));
+}, 'redirect response with empty Location, follow mode');
+
+promise_test(t => {
+  return fetch(url, {redirect:'manual'})
+    .then(resp => {
+      assert_equals(resp.type, 'opaqueredirect');
+      assert_equals(resp.status, 0);
+    });
+}, 'redirect response with empty Location, manual mode');
+
+done();
diff --git a/test/wpt/tests/fetch/api/redirect/redirect-location-escape.tentative.any.js b/test/wpt/tests/fetch/api/redirect/redirect-location-escape.tentative.any.js
new file mode 100644
index 00000000000..779ad705793
--- /dev/null
+++ b/test/wpt/tests/fetch/api/redirect/redirect-location-escape.tentative.any.js
@@ -0,0 +1,46 @@
+// META: global=window,worker
+// META: script=../resources/utils.js
+
+// See https://github.com/whatwg/fetch/issues/883 for the behavior covered by
+// this test. As of writing, the Fetch spec has not been updated to cover these.
+
+// redirectLocation tests that a Location header of |locationHeader| is resolved
+// to a URL which ends in |expectedUrlSuffix|. |locationHeader| is interpreted
+// as a byte sequence via isomorphic encode, as described in [INFRA]. This
+// allows the caller to specify byte sequences which are not valid UTF-8.
+// However, this means, e.g., U+2603 must be passed in as "\xe2\x98\x83", its
+// UTF-8 encoding, not "\u2603".
+//
+// [INFRA] https://infra.spec.whatwg.org/#isomorphic-encode
+function redirectLocation(
+    desc, redirectUrl, locationHeader, expectedUrlSuffix) {
+  promise_test(function(test) {
+    // Note we use escape() instead of encodeURIComponent(), so that characters
+    // are escaped as bytes in the isomorphic encoding.
+    var url = redirectUrl + '?simple=1&location=' + escape(locationHeader);
+
+    return fetch(url, {'redirect': 'follow'}).then(function(resp) {
+      assert_true(
+          resp.url.endsWith(expectedUrlSuffix),
+          resp.url + ' ends with ' + expectedUrlSuffix);
+    });
+  }, desc);
+}
+
+var redirUrl = RESOURCES_DIR + 'redirect.py';
+redirectLocation(
+    'Redirect to escaped UTF-8', redirUrl, 'top.txt?%E2%98%83%e2%98%83',
+    'top.txt?%E2%98%83%e2%98%83');
+redirectLocation(
+    'Redirect to unescaped UTF-8', redirUrl, 'top.txt?\xe2\x98\x83',
+    'top.txt?%E2%98%83');
+redirectLocation(
+    'Redirect to escaped and unescaped UTF-8', redirUrl,
+    'top.txt?\xe2\x98\x83%e2%98%83', 'top.txt?%E2%98%83%e2%98%83');
+redirectLocation(
+    'Escaping produces double-percent', redirUrl, 'top.txt?%\xe2\x98\x83',
+    'top.txt?%%E2%98%83');
+redirectLocation(
+    'Redirect to invalid UTF-8', redirUrl, 'top.txt?\xff', 'top.txt?%FF');
+
+done();
diff --git a/test/wpt/tests/fetch/api/redirect/redirect-mode.any.js b/test/wpt/tests/fetch/api/redirect/redirect-mode.any.js
new file mode 100644
index 00000000000..9f1ff98c65a
--- /dev/null
+++ b/test/wpt/tests/fetch/api/redirect/redirect-mode.any.js
@@ -0,0 +1,59 @@
+// META: script=/common/get-host-info.sub.js
+
+var redirectLocation = "cors-top.txt";
+const { ORIGIN, REMOTE_ORIGIN } = get_host_info();
+
+function testRedirect(origin, redirectStatus, redirectMode, corsMode) {
+  var url = new URL("../resources/redirect.py", self.location);
+  if (origin === "cross-origin") {
+    url.host = get_host_info().REMOTE_HOST;
+    url.port = get_host_info().HTTP_PORT;
+  }
+
+  var urlParameters = "?redirect_status=" + redirectStatus;
+  urlParameters += "&location=" + encodeURIComponent(redirectLocation);
+
+  var requestInit = {redirect: redirectMode, mode: corsMode};
+
+  promise_test(function(test) {
+    if (redirectMode === "error" ||
+        (corsMode === "no-cors" && redirectMode !== "follow" && origin !== "same-origin"))
+      return promise_rejects_js(test, TypeError, fetch(url + urlParameters, requestInit));
+    if (redirectMode === "manual")
+      return fetch(url + urlParameters, requestInit).then(function(resp) {
+        assert_equals(resp.status, 0, "Response's status is 0");
+        assert_equals(resp.type, "opaqueredirect", "Response's type is opaqueredirect");
+        assert_equals(resp.statusText, "", "Response's statusText is \"\"");
+        assert_equals(resp.url, url + urlParameters, "Response URL should be the original one");
+      });
+    if (redirectMode === "follow")
+      return fetch(url + urlParameters, requestInit).then(function(resp) {
+        if (corsMode !== "no-cors" || origin === "same-origin") {
+          assert_true(new URL(resp.url).pathname.endsWith(redirectLocation), "Response's url should be the redirected one");
+          assert_equals(resp.status, 200, "Response's status is 200");
+        } else {
+          assert_equals(resp.type, "opaque", "Response is opaque");
+        }
+      });
+    assert_unreached(redirectMode + " is no a valid redirect mode");
+  }, origin + " redirect " + redirectStatus + " in " + redirectMode + " redirect and " + corsMode + " mode");
+}
+
+for (var origin of ["same-origin", "cross-origin"]) {
+  for (var statusCode of [301, 302, 303, 307, 308]) {
+    for (var redirect of ["error", "manual", "follow"]) {
+      for (var mode of ["cors", "no-cors"])
+        testRedirect(origin, statusCode, redirect, mode);
+    }
+  }
+}
+
+promise_test(async (t) => {
+  const destination = `${ORIGIN}/common/blank.html`;
+  // We use /common/redirect.py intentionally, as we want a CORS error.
+  const url =
+    `${REMOTE_ORIGIN}/common/redirect.py?location=${destination}`;
+  await promise_rejects_js(t, TypeError,  fetch(url, { redirect: "manual" }));
+}, "manual redirect with a CORS error should be rejected");
+
+done();
diff --git a/test/wpt/tests/fetch/api/redirect/redirect-origin.any.js b/test/wpt/tests/fetch/api/redirect/redirect-origin.any.js
new file mode 100644
index 00000000000..b81b91601a8
--- /dev/null
+++ b/test/wpt/tests/fetch/api/redirect/redirect-origin.any.js
@@ -0,0 +1,42 @@
+// META: script=/common/utils.js
+// META: script=../resources/utils.js
+// META: script=/common/get-host-info.sub.js
+
+function testOriginAfterRedirection(desc, method, redirectUrl, redirectLocation, redirectStatus, expectedOrigin) {
+    var uuid_token = token();
+    var url = redirectUrl;
+    var urlParameters = "?token=" + uuid_token + "&max_age=0";
+    urlParameters += "&redirect_status=" + redirectStatus;
+    urlParameters += "&location=" + encodeURIComponent(redirectLocation);
+
+    var requestInit = {"mode": "cors", "redirect": "follow"};
+
+    promise_test(function(test) {
+        return fetch(RESOURCES_DIR + "clean-stash.py?token=" + uuid_token).then(function(resp) {
+            assert_equals(resp.status, 200, "Clean stash response's status is 200");
+            return fetch(url + urlParameters, requestInit).then(function(response) {
+                assert_equals(response.status, 200, "Inspect header response's status is 200");
+                assert_equals(response.headers.get("x-request-origin"), expectedOrigin, "Check origin header");
+            });
+        });
+    }, desc);
+}
+
+var redirectUrl = RESOURCES_DIR + "redirect.py";
+var corsRedirectUrl = get_host_info().HTTP_REMOTE_ORIGIN + dirname(location.pathname) + RESOURCES_DIR + "redirect.py";
+var locationUrl =  get_host_info().HTTP_ORIGIN + dirname(location.pathname) + RESOURCES_DIR + "inspect-headers.py?headers=origin";
+var corsLocationUrl =  get_host_info().HTTP_REMOTE_ORIGIN + dirname(location.pathname) + RESOURCES_DIR + "inspect-headers.py?cors&headers=origin";
+
+for (var code of [301, 302, 303, 307, 308]) {
+    testOriginAfterRedirection("Same origin to same origin redirection " + code, 'GET', redirectUrl, locationUrl, code, null);
+    testOriginAfterRedirection("Same origin to other origin redirection " + code, 'GET', redirectUrl, corsLocationUrl, code, get_host_info().HTTP_ORIGIN);
+    testOriginAfterRedirection("Other origin to other origin redirection " + code, 'GET', corsRedirectUrl, corsLocationUrl, code, get_host_info().HTTP_ORIGIN);
+    testOriginAfterRedirection("Other origin to same origin redirection " + code, 'GET', corsRedirectUrl, locationUrl + "&cors", code, "null");
+
+    testOriginAfterRedirection("Same origin to same origin redirection[POST] " + code, 'POST', redirectUrl, locationUrl, code, null);
+    testOriginAfterRedirection("Same origin to other origin redirection[POST] " + code, 'POST', redirectUrl, corsLocationUrl, code, get_host_info().HTTP_ORIGIN);
+    testOriginAfterRedirection("Other origin to other origin redirection[POST] " + code, 'POST', corsRedirectUrl, corsLocationUrl, code, get_host_info().HTTP_ORIGIN);
+    testOriginAfterRedirection("Other origin to same origin redirection[POST] " + code, 'POST', corsRedirectUrl, locationUrl + "&cors", code, "null");
+}
+
+done();
diff --git a/test/wpt/tests/fetch/api/redirect/redirect-referrer-override.any.js b/test/wpt/tests/fetch/api/redirect/redirect-referrer-override.any.js
new file mode 100644
index 00000000000..56e55d79e14
--- /dev/null
+++ b/test/wpt/tests/fetch/api/redirect/redirect-referrer-override.any.js
@@ -0,0 +1,104 @@
+// META: timeout=long
+// META: script=/common/utils.js
+// META: script=../resources/utils.js
+// META: script=/common/get-host-info.sub.js
+
+function getExpectation(expectations, init, initScenario, redirectPolicy, redirectScenario) {
+  let policies = [
+    expectations[initPolicy][initScenario],
+    expectations[redirectPolicy][redirectScenario]
+  ];
+
+  if (policies.includes("omitted")) {
+    return null;
+  } else if (policies.includes("origin")) {
+    return referrerOrigin;
+  } else {
+    // "stripped-referrer"
+    return referrerUrl;
+  }
+}
+
+function testReferrerAfterRedirection(desc, redirectUrl, redirectLocation, referrerPolicy, redirectReferrerPolicy, expectedReferrer) {
+  var url = redirectUrl;
+  var urlParameters = "?location=" + encodeURIComponent(redirectLocation);
+  var description = desc + ", " + referrerPolicy + " init, " + redirectReferrerPolicy + " redirect header ";
+
+  if (redirectReferrerPolicy)
+    urlParameters += "&redirect_referrerpolicy=" + redirectReferrerPolicy;
+
+  var requestInit = {"redirect": "follow", "referrerPolicy": referrerPolicy};
+    promise_test(function(test) {
+      return fetch(url + urlParameters, requestInit).then(function(response) {
+        assert_equals(response.status, 200, "Inspect header response's status is 200");
+        assert_equals(response.headers.get("x-request-referer"), expectedReferrer ? expectedReferrer : null, "Check referrer header");
+      });
+    }, description);
+}
+
+var referrerOrigin = get_host_info().HTTP_ORIGIN + "/";
+var referrerUrl = location.href;
+
+var redirectUrl = RESOURCES_DIR + "redirect.py";
+var locationUrl = get_host_info().HTTP_ORIGIN + dirname(location.pathname) + RESOURCES_DIR + "inspect-headers.py?headers=referer";
+var crossLocationUrl = get_host_info().HTTP_REMOTE_ORIGIN + dirname(location.pathname) + RESOURCES_DIR + "inspect-headers.py?cors&headers=referer";
+
+var expectations = {
+  "no-referrer": {
+    "same-origin": "omitted",
+    "cross-origin": "omitted"
+  },
+  "no-referrer-when-downgrade": {
+    "same-origin": "stripped-referrer",
+    "cross-origin": "stripped-referrer"
+  },
+  "origin": {
+    "same-origin": "origin",
+    "cross-origin": "origin"
+  },
+  "origin-when-cross-origin": {
+    "same-origin": "stripped-referrer",
+    "cross-origin": "origin",
+  },
+  "same-origin": {
+    "same-origin": "stripped-referrer",
+    "cross-origin": "omitted"
+  },
+  "strict-origin": {
+    "same-origin": "origin",
+    "cross-origin": "origin"
+  },
+  "strict-origin-when-cross-origin": {
+    "same-origin": "stripped-referrer",
+    "cross-origin": "origin"
+  },
+  "unsafe-url": {
+    "same-origin": "stripped-referrer",
+    "cross-origin": "stripped-referrer"
+  }
+};
+
+for (var initPolicy in expectations) {
+  for (var redirectPolicy in expectations) {
+
+    // Redirect to same-origin URL
+    testReferrerAfterRedirection(
+      "Same origin redirection",
+      redirectUrl,
+      locationUrl,
+      initPolicy,
+      redirectPolicy,
+      getExpectation(expectations, initPolicy, "same-origin", redirectPolicy, "same-origin"));
+
+    // Redirect to cross-origin URL
+    testReferrerAfterRedirection(
+      "Cross origin redirection",
+      redirectUrl,
+      crossLocationUrl,
+      initPolicy,
+      redirectPolicy,
+      getExpectation(expectations, initPolicy, "same-origin", redirectPolicy, "cross-origin"));
+  }
+}
+
+done();
diff --git a/test/wpt/tests/fetch/api/redirect/redirect-referrer.any.js b/test/wpt/tests/fetch/api/redirect/redirect-referrer.any.js
new file mode 100644
index 00000000000..99fda42e69b
--- /dev/null
+++ b/test/wpt/tests/fetch/api/redirect/redirect-referrer.any.js
@@ -0,0 +1,66 @@
+// META: timeout=long
+// META: script=/common/utils.js
+// META: script=../resources/utils.js
+// META: script=/common/get-host-info.sub.js
+
+function testReferrerAfterRedirection(desc, redirectUrl, redirectLocation, referrerPolicy, redirectReferrerPolicy, expectedReferrer) {
+  var url = redirectUrl;
+  var urlParameters = "?location=" + encodeURIComponent(redirectLocation);
+
+  if (redirectReferrerPolicy)
+    urlParameters += "&redirect_referrerpolicy=" + redirectReferrerPolicy;
+
+  var requestInit = {"redirect": "follow", "referrerPolicy": referrerPolicy};
+
+    promise_test(function(test) {
+      return fetch(url + urlParameters, requestInit).then(function(response) {
+        assert_equals(response.status, 200, "Inspect header response's status is 200");
+        assert_equals(response.headers.get("x-request-referer"), expectedReferrer ? expectedReferrer : null, "Check referrer header");
+      });
+    }, desc);
+}
+
+var referrerOrigin = get_host_info().HTTP_ORIGIN + "/";
+var referrerUrl = location.href;
+
+var redirectUrl = RESOURCES_DIR + "redirect.py";
+var locationUrl = get_host_info().HTTP_ORIGIN + dirname(location.pathname) + RESOURCES_DIR + "inspect-headers.py?headers=referer";
+var crossLocationUrl =  get_host_info().HTTP_REMOTE_ORIGIN + dirname(location.pathname) + RESOURCES_DIR + "inspect-headers.py?cors&headers=referer";
+
+testReferrerAfterRedirection("Same origin redirection, empty init, unsafe-url redirect header ", redirectUrl, locationUrl, "", "unsafe-url", referrerUrl);
+testReferrerAfterRedirection("Same origin redirection, empty init, no-referrer-when-downgrade redirect header ", redirectUrl, locationUrl, "", "no-referrer-when-downgrade", referrerUrl);
+testReferrerAfterRedirection("Same origin redirection, empty init, same-origin redirect header ", redirectUrl, locationUrl, "", "same-origin", referrerUrl);
+testReferrerAfterRedirection("Same origin redirection, empty init, origin redirect header ", redirectUrl, locationUrl, "", "origin", referrerOrigin);
+testReferrerAfterRedirection("Same origin redirection, empty init, origin-when-cross-origin redirect header ", redirectUrl, locationUrl, "", "origin-when-cross-origin", referrerUrl);
+testReferrerAfterRedirection("Same origin redirection, empty init, no-referrer redirect header ", redirectUrl, locationUrl, "", "no-referrer", null);
+testReferrerAfterRedirection("Same origin redirection, empty init, strict-origin redirect header ", redirectUrl, locationUrl, "", "strict-origin", referrerOrigin);
+testReferrerAfterRedirection("Same origin redirection, empty init, strict-origin-when-cross-origin redirect header ", redirectUrl, locationUrl, "", "strict-origin-when-cross-origin", referrerUrl);
+
+testReferrerAfterRedirection("Same origin redirection, empty redirect header, unsafe-url init ", redirectUrl, locationUrl, "unsafe-url", "", referrerUrl);
+testReferrerAfterRedirection("Same origin redirection, empty redirect header, no-referrer-when-downgrade init ", redirectUrl, locationUrl, "no-referrer-when-downgrade", "", referrerUrl);
+testReferrerAfterRedirection("Same origin redirection, empty redirect header, same-origin init ", redirectUrl, locationUrl, "same-origin", "", referrerUrl);
+testReferrerAfterRedirection("Same origin redirection, empty redirect header, origin init ", redirectUrl, locationUrl, "origin", "", referrerOrigin);
+testReferrerAfterRedirection("Same origin redirection, empty redirect header, origin-when-cross-origin init ", redirectUrl, locationUrl, "origin-when-cross-origin", "", referrerUrl);
+testReferrerAfterRedirection("Same origin redirection, empty redirect header, no-referrer init ", redirectUrl, locationUrl, "no-referrer", "", null);
+testReferrerAfterRedirection("Same origin redirection, empty redirect header, strict-origin init ", redirectUrl, locationUrl, "strict-origin", "", referrerOrigin);
+testReferrerAfterRedirection("Same origin redirection, empty redirect header, strict-origin-when-cross-origin init ", redirectUrl, locationUrl, "strict-origin-when-cross-origin", "", referrerUrl);
+
+testReferrerAfterRedirection("Cross origin redirection, empty init, unsafe-url redirect header ", redirectUrl, crossLocationUrl, "", "unsafe-url", referrerUrl);
+testReferrerAfterRedirection("Cross origin redirection, empty init, no-referrer-when-downgrade redirect header ", redirectUrl, crossLocationUrl, "", "no-referrer-when-downgrade", referrerUrl);
+testReferrerAfterRedirection("Cross origin redirection, empty init, same-origin redirect header ", redirectUrl, crossLocationUrl, "", "same-origin", null);
+testReferrerAfterRedirection("Cross origin redirection, empty init, origin redirect header ", redirectUrl, crossLocationUrl, "", "origin", referrerOrigin);
+testReferrerAfterRedirection("Cross origin redirection, empty init, origin-when-cross-origin redirect header ", redirectUrl, crossLocationUrl, "", "origin-when-cross-origin", referrerOrigin);
+testReferrerAfterRedirection("Cross origin redirection, empty init, no-referrer redirect header ", redirectUrl, crossLocationUrl, "", "no-referrer", null);
+testReferrerAfterRedirection("Cross origin redirection, empty init, strict-origin redirect header ", redirectUrl, crossLocationUrl, "", "strict-origin", referrerOrigin);
+testReferrerAfterRedirection("Cross origin redirection, empty init, strict-origin-when-cross-origin redirect header ", redirectUrl, crossLocationUrl, "", "strict-origin-when-cross-origin", referrerOrigin);
+
+testReferrerAfterRedirection("Cross origin redirection, empty redirect header, unsafe-url init ", redirectUrl, crossLocationUrl, "unsafe-url", "", referrerUrl);
+testReferrerAfterRedirection("Cross origin redirection, empty redirect header, no-referrer-when-downgrade init ", redirectUrl, crossLocationUrl, "no-referrer-when-downgrade", "", referrerUrl);
+testReferrerAfterRedirection("Cross origin redirection, empty redirect header, same-origin init ", redirectUrl, crossLocationUrl, "same-origin", "", null);
+testReferrerAfterRedirection("Cross origin redirection, empty redirect header, origin init ", redirectUrl, crossLocationUrl, "origin", "", referrerOrigin);
+testReferrerAfterRedirection("Cross origin redirection, empty redirect header, origin-when-cross-origin init ", redirectUrl, crossLocationUrl, "origin-when-cross-origin", "", referrerOrigin);
+testReferrerAfterRedirection("Cross origin redirection, empty redirect header, no-referrer init ", redirectUrl, crossLocationUrl, "no-referrer", "", null);
+testReferrerAfterRedirection("Cross origin redirection, empty redirect header, strict-origin init ", redirectUrl, crossLocationUrl, "strict-origin", "", referrerOrigin);
+testReferrerAfterRedirection("Cross origin redirection, empty redirect header, strict-origin-when-cross-origin init ", redirectUrl, crossLocationUrl, "strict-origin-when-cross-origin", "", referrerOrigin);
+
+done();
diff --git a/test/wpt/tests/fetch/api/redirect/redirect-upload.h2.any.js b/test/wpt/tests/fetch/api/redirect/redirect-upload.h2.any.js
new file mode 100644
index 00000000000..521bd3adc28
--- /dev/null
+++ b/test/wpt/tests/fetch/api/redirect/redirect-upload.h2.any.js
@@ -0,0 +1,33 @@
+// META: global=window,worker
+// META: script=../resources/utils.js
+// META: script=/common/utils.js
+// META: script=/common/get-host-info.sub.js
+
+const redirectUrl = RESOURCES_DIR + "redirect.h2.py";
+const redirectLocation = "top.txt";
+
+async function fetchStreamRedirect(statusCode) {
+  const url = RESOURCES_DIR + "redirect.h2.py" +
+   `?redirect_status=${statusCode}&location=${redirectLocation}`;
+  const requestInit = {method: "POST"};
+  requestInit["body"] = new ReadableStream({start: controller => {
+    const encoder = new TextEncoder();
+    controller.enqueue(encoder.encode("Test"));
+    controller.close();
+  }});
+  requestInit.duplex = "half";
+  return fetch(url, requestInit);
+}
+
+promise_test(async () => {
+  const resp = await fetchStreamRedirect(303);
+  assert_equals(resp.status, 200);
+  assert_true(new URL(resp.url).pathname.endsWith(redirectLocation),
+   "Response's url should be the redirected one");
+}, "Fetch upload streaming should be accepted on 303");
+
+for (const statusCode of [301, 302, 307, 308]) {
+  promise_test(t => {
+    return promise_rejects_js(t, TypeError, fetchStreamRedirect(statusCode));
+  }, `Fetch upload streaming should fail on ${statusCode}`);
+}
diff --git a/test/wpt/tests/fetch/api/request/destination/fetch-destination-frame.https.html b/test/wpt/tests/fetch/api/request/destination/fetch-destination-frame.https.html
new file mode 100644
index 00000000000..f3f9f7856d5
--- /dev/null
+++ b/test/wpt/tests/fetch/api/request/destination/fetch-destination-frame.https.html
@@ -0,0 +1,51 @@
+<!DOCTYPE html>
+<title>Fetch destination tests for resources with no load event</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/common/get-host-info.sub.js"></script>
+<script src="/service-workers/service-worker/resources/test-helpers.sub.js"></script>
+<script>
+let frame;
+const kScope = 'resources/dummy.html?dest=frame';
+
+// Set up the service worker and the frame.
+promise_test(t => {
+    const kScript = 'resources/fetch-destination-worker-frame.js';
+    return service_worker_unregister_and_register(t, kScript, kScope)
+      .then(registration => {
+          add_completion_callback(() => {
+              registration.unregister();
+            });
+
+          return wait_for_state(t, registration.installing, 'activated');
+        });
+  }, 'Initialize global state');
+
+var waitOnMessageFromSW = async t => {
+    await new Promise((resolve, reject) => {
+        navigator.serviceWorker.onmessage = t.step_func(event => {
+            if (event.data == "PASS") {
+                resolve();
+            } else {
+                reject();
+            }
+        });
+    }).catch(() => {;
+        assert_unreached("Wrong destination.");
+    });
+    t.add_cleanup(() => { frame.contentWindow.navigator.serviceWorker.onmessage = null; });
+}
+
+// Document destination
+///////////////////////
+promise_test(async t => {
+    var f = document.createElement('frame');
+    frame = f;
+    f.className = 'test-frame';
+    f.src = kScope;
+    document.body.appendChild(f);
+    await waitOnMessageFromSW(t);
+    add_completion_callback(() => { f.remove(); });
+}, 'frame fetches with a "frame" Request.destination');
+
+</script>
diff --git a/test/wpt/tests/fetch/api/request/destination/fetch-destination-iframe.https.html b/test/wpt/tests/fetch/api/request/destination/fetch-destination-iframe.https.html
new file mode 100644
index 00000000000..1aa5a5613b1
--- /dev/null
+++ b/test/wpt/tests/fetch/api/request/destination/fetch-destination-iframe.https.html
@@ -0,0 +1,51 @@
+<!DOCTYPE html>
+<title>Fetch destination tests for resources with no load event</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/common/get-host-info.sub.js"></script>
+<script src="/service-workers/service-worker/resources/test-helpers.sub.js"></script>
+<script>
+let frame;
+const kScope = 'resources/dummy.html?dest=iframe';
+
+// Set up the service worker and the frame.
+promise_test(t => {
+    const kScript = 'resources/fetch-destination-worker-iframe.js';
+    return service_worker_unregister_and_register(t, kScript, kScope)
+      .then(registration => {
+          add_completion_callback(() => {
+              registration.unregister();
+            });
+
+          return wait_for_state(t, registration.installing, 'activated');
+        });
+  }, 'Initialize global state');
+
+var waitOnMessageFromSW = async t => {
+    await new Promise((resolve, reject) => {
+        navigator.serviceWorker.onmessage = t.step_func(event => {
+            if (event.data == "PASS") {
+                resolve();
+            } else {
+                reject();
+            }
+        });
+    }).catch(() => {;
+        assert_unreached("Wrong destination.");
+    });
+    t.add_cleanup(() => { frame.contentWindow.navigator.serviceWorker.onmessage = null; });
+}
+
+// Document destination
+///////////////////////
+promise_test(async t => {
+    var f = document.createElement('iframe');
+    frame = f;
+    f.className = 'test-iframe';
+    f.src = kScope;
+    document.body.appendChild(f);
+    await waitOnMessageFromSW(t);
+    add_completion_callback(() => { f.remove(); });
+}, 'iframe fetches with a "iframe" Request.destination');
+
+</script>
diff --git a/test/wpt/tests/fetch/api/request/destination/fetch-destination-no-load-event.https.html b/test/wpt/tests/fetch/api/request/destination/fetch-destination-no-load-event.https.html
new file mode 100644
index 00000000000..1778bf2581a
--- /dev/null
+++ b/test/wpt/tests/fetch/api/request/destination/fetch-destination-no-load-event.https.html
@@ -0,0 +1,124 @@
+<!DOCTYPE html>
+<title>Fetch destination tests for resources with no load event</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/common/get-host-info.sub.js"></script>
+<script src="/service-workers/service-worker/resources/test-helpers.sub.js"></script>
+<script>
+let frame;
+
+// Set up the service worker and the frame.
+promise_test(t => {
+    const kScope = 'resources/';
+    const kFrame = 'resources/empty.https.html';
+    const kScript = 'resources/fetch-destination-worker-no-load-event.js';
+    return service_worker_unregister_and_register(t, kScript, kScope)
+      .then(registration => {
+          add_completion_callback(() => {
+              registration.unregister();
+            });
+
+          return wait_for_state(t, registration.installing, 'activated');
+        })
+      .then(() => {
+          return with_iframe(kFrame);
+        })
+      .then(f => {
+          frame = f;
+          add_completion_callback(() => { f.remove(); });
+        });
+  }, 'Initialize global state');
+
+var waitOnMessageFromSW = async t => {
+    await new Promise((resolve, reject) => {
+        frame.contentWindow.navigator.serviceWorker.onmessage = t.step_func(event => {
+            if (event.data == "PASS") {
+                resolve();
+            } else {
+                reject();
+            }
+        });
+    }).catch(() => {;
+        assert_unreached("Wrong destination.");
+    });
+    t.add_cleanup(() => { frame.contentWindow.navigator.serviceWorker.onmessage = null; });
+}
+// Actual tests
+
+// Image destination
+////////////////////
+
+// CSS background image - image destination
+promise_test(async t => {
+    let node = frame.contentWindow.document.createElement("div");
+    node.style = "background-image: url(dummy.png?t=bg2&dest=image)";
+    frame.contentWindow.document.body.appendChild(node);
+
+    await waitOnMessageFromSW(t);
+}, 'Background image fetches with an "image" Request.destination');
+
+// Font destination
+///////////////////
+
+// Font loading API - font destination
+promise_test(async t => {
+    let font = new frame.contentWindow.FontFace("foo", "url(dummy.ttf?t=api&dest=font)");
+    font.load();
+
+    await waitOnMessageFromSW(t);
+}, 'Font loading API fetches with an "font" Request.destination');
+
+// CSS font - font destination
+promise_test(async t => {
+    let style = frame.contentWindow.document.createElement("style");
+    style.innerHTML = "@font-face { font-family: foo; src: url(dummy.ttf?t=css&dest=font); }";
+    style.innerHTML += "div {font-family: foo; }";
+    let div = frame.contentWindow.document.createElement("div");
+    div.innerHTML = "bar";
+    frame.contentWindow.document.body.appendChild(style);
+    frame.contentWindow.document.body.appendChild(div);
+
+    await waitOnMessageFromSW(t);
+}, 'CSS font fetches with an "font" Request.destination');
+
+// Empty string destination
+///////////////////////////
+
+// sendBeacon() - empty string destination
+promise_test(async t => {
+    frame.contentWindow.navigator.sendBeacon("dummy?t=beacon&dest=", "foobar");
+
+    await waitOnMessageFromSW(t);
+}, 'sendBeacon() fetches with an empty string Request.destination');
+
+// Cache.add() - empty string destination
+promise_test(async t => {
+    frame.contentWindow.caches.open("foo").then(cache => {
+        cache.add("dummy?t=cache&dest=");
+    });
+
+    await waitOnMessageFromSW(t);
+}, 'Cache.add() fetches with an empty string Request.destination');
+
+// script destination
+/////////////////////
+
+// importScripts() - script destination
+promise_test(async t => {
+    let worker = new frame.contentWindow.Worker("importer.js");
+
+    await waitOnMessageFromSW(t);
+}, 'importScripts() fetches with a "script" Request.destination');
+
+// style destination
+/////////////////////
+// @import - style destination
+promise_test(async t => {
+    let node = frame.contentWindow.document.createElement("style");
+    node.innerHTML = '@import url("dummy?t=import&dest=style")';
+    frame.contentWindow.document.body.appendChild(node);
+
+    await waitOnMessageFromSW(t);
+}, '@import fetches with a "style" Request.destination');
+
+</script>
diff --git a/test/wpt/tests/fetch/api/request/destination/fetch-destination-prefetch.https.html b/test/wpt/tests/fetch/api/request/destination/fetch-destination-prefetch.https.html
new file mode 100644
index 00000000000..db99202df87
--- /dev/null
+++ b/test/wpt/tests/fetch/api/request/destination/fetch-destination-prefetch.https.html
@@ -0,0 +1,46 @@
+<!DOCTYPE html>
+<title>Fetch destination test for prefetching</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/common/get-host-info.sub.js"></script>
+<script src="/common/media.js"></script>
+<script src="/service-workers/service-worker/resources/test-helpers.sub.js"></script>
+<script>
+let frame;
+
+// Set up the service worker and the frame.
+promise_test(t => {
+    const kScope = 'resources/empty.https.html';
+    const kScript = 'resources/fetch-destination-worker.js';
+    return service_worker_unregister_and_register(t, kScript, kScope)
+      .then(registration => {
+          add_completion_callback(() => {
+              registration.unregister();
+            });
+
+          return wait_for_state(t, registration.installing, 'activated');
+        })
+      .then(() => {
+          return with_iframe(kScope);
+        })
+      .then(f => {
+          frame = f;
+          add_completion_callback(() => { f.remove(); });
+        });
+  }, 'Initialize global state');
+
+// HTMLLinkElement with rel=prefetch - empty string destination
+promise_test(async t => {
+  await new Promise((resolve, reject) => {
+      let node = frame.contentWindow.document.createElement("link");
+      node.rel = "prefetch";
+      node.onload = resolve;
+      node.onerror = reject;
+      node.href = "dummy?dest=";
+      frame.contentWindow.document.body.appendChild(node);
+  }).catch(() => {
+      assert_unreached("Fetch errored.");
+  });
+}, 'HTMLLinkElement with rel=prefetch fetches with an empty string Request.destination');
+
+</script>
diff --git a/test/wpt/tests/fetch/api/request/destination/fetch-destination-worker.https.html b/test/wpt/tests/fetch/api/request/destination/fetch-destination-worker.https.html
new file mode 100644
index 00000000000..5935c1ff31e
--- /dev/null
+++ b/test/wpt/tests/fetch/api/request/destination/fetch-destination-worker.https.html
@@ -0,0 +1,60 @@
+<!DOCTYPE html>
+<title>Fetch destination tests for resources with no load event</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/common/get-host-info.sub.js"></script>
+<script src="/service-workers/service-worker/resources/test-helpers.sub.js"></script>
+<script>
+let frame;
+
+// Set up the service worker and the frame.
+promise_test(t => {
+    const kScope = 'resources/dummy.html';
+    const kScript = 'resources/fetch-destination-worker-no-load-event.js';
+    return service_worker_unregister_and_register(t, kScript, kScope)
+      .then(registration => {
+          add_completion_callback(() => {
+              registration.unregister();
+            });
+
+          return wait_for_state(t, registration.installing, 'activated');
+        })
+      .then(() => {
+          return with_iframe(kScope);
+        })
+      .then(f => {
+          frame = f;
+          add_completion_callback(() => { f.remove(); });
+        });
+  }, 'Initialize global state');
+
+var waitOnMessageFromSW = async t => {
+    await new Promise((resolve, reject) => {
+        frame.contentWindow.navigator.serviceWorker.onmessage = t.step_func(event => {
+            if (event.data == "PASS") {
+                resolve();
+            } else {
+                reject();
+            }
+        });
+    }).catch(() => {;
+        assert_unreached("Wrong destination.");
+    });
+    t.add_cleanup(() => { frame.contentWindow.navigator.serviceWorker.onmessage = null; });
+}
+
+// worker destination
+/////////////////////
+promise_test(async t => {
+    // We can use an html file as we don't really care about the dedicated worker successfully loading.
+    let worker = new frame.contentWindow.Worker("dummy.html?t=worker&dest=worker");
+    await waitOnMessageFromSW(t);
+}, 'DedicatedWorker fetches with a "worker" Request.destination');
+
+promise_test(async t => {
+    // We can use an html file as we don't really care about the shared worker successfully loading.
+    let worker = new frame.contentWindow.SharedWorker("dummy.html?t=sharedworker&dest=sharedworker");
+    await waitOnMessageFromSW(t);
+}, 'SharedWorker fetches with a "sharedworker" Request.destination');
+
+</script>
diff --git a/test/wpt/tests/fetch/api/request/destination/fetch-destination.https.html b/test/wpt/tests/fetch/api/request/destination/fetch-destination.https.html
new file mode 100644
index 00000000000..0094b0b6fe8
--- /dev/null
+++ b/test/wpt/tests/fetch/api/request/destination/fetch-destination.https.html
@@ -0,0 +1,435 @@
+<!DOCTYPE html>
+<title>Fetch destination tests</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/common/get-host-info.sub.js"></script>
+<script src="/common/media.js"></script>
+<script src="/service-workers/service-worker/resources/test-helpers.sub.js"></script>
+<script>
+let frame;
+
+// Set up the service worker and the frame.
+promise_test(t => {
+    const kScope = 'resources/empty.https.html';
+    const kScript = 'resources/fetch-destination-worker.js';
+    return service_worker_unregister_and_register(t, kScript, kScope)
+      .then(registration => {
+          add_completion_callback(() => {
+              registration.unregister();
+            });
+
+          return wait_for_state(t, registration.installing, 'activated');
+        })
+      .then(() => {
+          return with_iframe(kScope);
+        })
+      .then(f => {
+          frame = f;
+          add_completion_callback(() => { f.remove(); });
+        });
+  }, 'Initialize global state');
+
+// Actual tests
+
+// Image destination
+////////////////////
+
+// HTMLImageElement - image destination
+promise_test(async t => {
+  await new Promise((resolve, reject) => {
+      let node = frame.contentWindow.document.createElement("img");
+      node.onload = resolve;
+      node.onerror = reject;
+      node.src = "dummy.png?dest=image";
+  }).catch(() => {
+      assert_unreached("Fetch errored.");
+  });
+}, 'HTMLImageElement fetches with an "image" Request.destination');
+
+// HTMLImageElement with srcset attribute - image destination
+promise_test(async t => {
+  await new Promise((resolve, reject) => {
+      let node = frame.contentWindow.document.createElement("img");
+      node.onload = resolve;
+      node.onerror = reject;
+      node.srcset = "dummy.png?t=srcset&dest=image";
+  }).catch(() => {
+      assert_unreached("Fetch errored.");
+  });
+}, 'HTMLImageElement with srcset attribute fetches with an "image" Request.destination');
+
+// HTMLImageElement with srcset attribute - image destination
+promise_test(async t => {
+  await new Promise((resolve, reject) => {
+      let img = frame.contentWindow.document.createElement("img");
+      let picture = frame.contentWindow.document.createElement("picture");
+      let source = frame.contentWindow.document.createElement("source");
+      picture.appendChild(source);
+      picture.appendChild(img);
+      img.onload = resolve;
+      img.onerror = reject;
+      source.srcset = "dummy.png?t=picture&dest=image";
+  }).catch(() => {
+      assert_unreached("Fetch errored.");
+  });
+}, 'HTMLImageElement with a HTMLPictureElement parent attribute fetches with an "image" Request.destination');
+
+// SVGImageElement - image destination
+promise_test(async t => {
+  await new Promise((resolve, reject) => {
+      let svg = frame.contentWindow.document.createElementNS('http://www.w3.org/2000/svg','svg');
+      svg.setAttributeNS('http://www.w3.org/2000/svg','xlink','http://www.w3.org/1999/xlink');
+      let svgimg = frame.contentWindow.document.createElementNS('http://www.w3.org/2000/svg','image');
+      svgimg.onload = resolve;
+      svgimg.onerror = reject;
+      svgimg.setAttributeNS('http://www.w3.org/1999/xlink','href','dummy.png?t=svg&dest=image');
+      svg.appendChild(svgimg);
+      frame.contentWindow.document.documentElement.appendChild(svg);
+  }).catch(() => {
+      assert_unreached("Fetch errored.");
+  });
+}, 'SVGImageElement fetches with an "image" Request.destination');
+
+// Empty string destination
+///////////////////////////
+
+// fetch() - empty string destination
+promise_test(async t => {
+  let response = await frame.contentWindow.fetch("dummy?dest=");
+  assert_true(response.ok);
+}, 'fetch() fetches with an empty string Request.destination');
+
+// XMLHttpRequest - empty string destination
+promise_test(async t => {
+  let xhr;
+  await new Promise((resolve, reject) => {
+      xhr = new frame.contentWindow.XMLHttpRequest();
+      xhr.onload = resolve;
+      xhr.onerror = reject;
+      xhr.open("GET", "dummy?t=xhr&dest=");
+      xhr.send();
+    }).catch(() => {
+      assert_unreached("Fetch errored.");
+    });
+  assert_equals(xhr.status, 200);
+}, 'XMLHttpRequest() fetches with an empty string Request.destination');
+
+// EventSource - empty string destination
+promise_test(async t => {
+  let xhr;
+  await new Promise((resolve, reject) => {
+      eventSource = new frame.contentWindow.EventSource("dummy.es?t=eventsource&dest=");
+      eventSource.onopen = resolve;
+      eventSource.onerror = reject;
+    }).catch(() => {
+      assert_unreached("Fetch errored.");
+    });
+}, 'EventSource() fetches with an empty string Request.destination');
+
+// HTMLAudioElement - audio destination
+///////////////////////////////////////
+promise_test(async t => {
+  await new Promise((resolve, reject) => {
+      let audioURL = getAudioURI("dummy_audio");
+      let node = frame.contentWindow.document.createElement("audio");
+      node.onloadeddata = resolve;
+      node.onerror = reject;
+      node.src = audioURL + "?dest=audio";
+  }).catch(() => {
+      assert_unreached("Fetch errored.");
+  });
+}, 'HTMLAudioElement fetches with an "audio" Request.destination');
+
+// HTMLVideoElement - video destination
+///////////////////////////////////////
+promise_test(async t => {
+  await new Promise((resolve, reject) => {
+      let videoURL = getVideoURI("dummy_video");
+      let node = frame.contentWindow.document.createElement("video");
+      node.onloadeddata = resolve;
+      node.onerror = reject;
+      node.src = videoURL + "?dest=video";
+  }).catch(() => {
+      assert_unreached("Fetch errored.");
+  });
+}, 'HTMLVideoElement fetches with a "video" Request.destination');
+
+// script destinations
+//////////////////////
+
+// HTMLScriptElement - script destination
+promise_test(async t => {
+  await new Promise((resolve, reject) => {
+      let node = frame.contentWindow.document.createElement("script");
+      node.onload = resolve;
+      node.onerror = reject;
+      node.src = "dummy?dest=script";
+      frame.contentWindow.document.body.appendChild(node);
+  }).catch(() => {
+      assert_unreached("Fetch errored.");
+  });
+}, 'HTMLScriptElement fetches with a "script" Request.destination');
+
+// audioworklet destination
+//////////////////////
+promise_test(async t => {
+  let audioContext = new frame.contentWindow.AudioContext();
+  await audioContext.audioWorklet.addModule("dummy?dest=audioworklet");
+}, 'AudioWorklet module fetches with a "audioworklet" Request.destination');
+
+// Style destination
+////////////////////
+
+// HTMLLinkElement with rel=stylesheet - style destination
+promise_test(async t => {
+  await new Promise((resolve, reject) => {
+      let node = frame.contentWindow.document.createElement("link");
+      node.rel = "stylesheet";
+      node.onload = resolve;
+      node.onerror = reject;
+      node.href = "dummy?dest=style";
+      frame.contentWindow.document.body.appendChild(node);
+  }).catch(() => {
+      assert_unreached("Fetch errored.");
+  });
+}, 'HTMLLinkElement with rel=stylesheet fetches with a "style" Request.destination');
+
+// Preload tests
+////////////////
+// HTMLLinkElement with rel=preload and as=fetch - empty string destination
+promise_test(async t => {
+  await new Promise((resolve, reject) => {
+      let node = frame.contentWindow.document.createElement("link");
+      node.rel = "preload";
+      node.as = "fetch";
+      if (node.as != "fetch") {
+        resolve();
+      }
+      node.onload = resolve;
+      node.onerror = reject;
+      node.href = "dummy?t=2&dest=";
+      frame.contentWindow.document.body.appendChild(node);
+  }).catch(() => {
+      assert_unreached("Fetch errored.");
+  });
+}, 'HTMLLinkElement with rel=preload and as=fetch fetches with an empty string Request.destination');
+
+// HTMLLinkElement with rel=preload and as=style - style destination
+promise_test(async t => {
+  await new Promise((resolve, reject) => {
+      let node = frame.contentWindow.document.createElement("link");
+      node.rel = "preload";
+      node.as = "style";
+      if (node.as != "style") {
+        resolve();
+      }
+      node.onload = resolve;
+      node.onerror = reject;
+      node.href = "dummy?t=2&dest=style";
+      frame.contentWindow.document.body.appendChild(node);
+  }).catch(() => {
+      assert_unreached("Fetch errored.");
+  });
+}, 'HTMLLinkElement with rel=preload and as=style fetches with a "style" Request.destination');
+
+// HTMLLinkElement with rel=preload and as=script - script destination
+promise_test(async t => {
+  await new Promise((resolve, reject) => {
+      let node = frame.contentWindow.document.createElement("link");
+      node.rel = "preload";
+      node.as = "script";
+      if (node.as != "script") {
+        resolve();
+      }
+      node.onload = resolve;
+      node.onerror = reject;
+      node.href = "dummy?t=2&dest=script";
+      frame.contentWindow.document.body.appendChild(node);
+  }).catch(() => {
+      assert_unreached("Fetch errored.");
+  });
+}, 'HTMLLinkElement with rel=preload and as=script fetches with a "script" Request.destination');
+
+// HTMLLinkElement with rel=preload and as=font - font destination
+promise_test(async t => {
+  await new Promise((resolve, reject) => {
+      let node = frame.contentWindow.document.createElement("link");
+      node.rel = "preload";
+      node.as = "font";
+      if (node.as != "font") {
+        resolve();
+      }
+      node.onload = resolve;
+      node.onerror = reject;
+      node.href = "dummy?t=2&dest=font";
+      frame.contentWindow.document.body.appendChild(node);
+  }).catch(() => {
+      assert_unreached("Fetch errored.");
+  });
+}, 'HTMLLinkElement with rel=preload and as=font fetches with a "font" Request.destination');
+
+// HTMLLinkElement with rel=preload and as=image - image destination
+promise_test(async t => {
+  await new Promise((resolve, reject) => {
+      let node = frame.contentWindow.document.createElement("link");
+      node.rel = "preload";
+      node.as = "image";
+      if (node.as != "image") {
+        resolve();
+      }
+      node.onload = resolve;
+      node.onerror = reject;
+      node.href = "dummy.png?t=2&dest=image";
+      frame.contentWindow.document.body.appendChild(node);
+  }).catch(() => {
+      assert_unreached("Fetch errored.");
+  });
+}, 'HTMLLinkElement with rel=preload and as=image fetches with a "image" Request.destination');
+
+// HTMLLinkElement with rel=preload and as=audio - audio destination
+promise_test(async t => {
+  await new Promise((resolve, reject) => {
+      let audioURL = getAudioURI("dummy_audio");
+      let node = frame.contentWindow.document.createElement("link");
+      node.rel = "preload";
+      node.as = "audio";
+      if (node.as != "audio") {
+        resolve();
+      }
+      node.onload = resolve;
+      node.onerror = reject;
+      node.href = audioURL + "?dest=audio";
+      frame.contentWindow.document.body.appendChild(node);
+  }).catch(() => {
+      assert_unreached("Fetch errored.");
+  });
+}, 'HTMLLinkElement with rel=preload and as=audio fetches with a "audio" Request.destination');
+
+// HTMLLinkElement with rel=preload and as=video - video destination
+promise_test(async t => {
+  await new Promise((resolve, reject) => {
+      let videoURL = getVideoURI("dummy_video");
+      let node = frame.contentWindow.document.createElement("link");
+      node.rel = "preload";
+      node.as = "video";
+      if (node.as != "video") {
+        resolve();
+      }
+      node.onload = resolve;
+      node.onerror = reject;
+      node.href = videoURL + "?dest=video";
+      frame.contentWindow.document.body.appendChild(node);
+  }).catch(() => {
+      assert_unreached("Fetch errored.");
+  });
+}, 'HTMLLinkElement with rel=preload and as=video fetches with a "video" Request.destination');
+
+// HTMLLinkElement with rel=preload and as=track - track destination
+promise_test(async t => {
+  await new Promise((resolve, reject) => {
+      let node = frame.contentWindow.document.createElement("link");
+      node.rel = "preload";
+      node.as = "track";
+      if (node.as != "track") {
+        resolve();
+      }
+      node.onload = resolve;
+      node.onerror = reject;
+      node.href = "dummy?dest=track";
+      frame.contentWindow.document.body.appendChild(node);
+  }).catch(() => {
+      assert_unreached("Fetch errored.");
+  });
+}, 'HTMLLinkElement with rel=preload and as=track fetches with a "track" Request.destination');
+
+// HTMLLinkElement with rel=preload and as=document - document destination
+promise_test(async t => {
+  await new Promise((resolve, reject) => {
+      let node = frame.contentWindow.document.createElement("link");
+      node.rel = "preload";
+      node.as = "document";
+      if (node.as != "document") {
+        resolve();
+      }
+      node.onload = resolve;
+      node.onerror = reject;
+      node.href = "dummy?dest=document";
+      frame.contentWindow.document.body.appendChild(node);
+  }).catch(() => {
+      assert_unreached("Fetch errored.");
+  });
+}, 'HTMLLinkElement with rel=preload and as=document fetches with a "document" Request.destination');
+
+// HTMLLinkElement with rel=preload and as=worker - worker destination
+promise_test(async t => {
+  await new Promise((resolve, reject) => {
+      let node = frame.contentWindow.document.createElement("link");
+      node.rel = "preload";
+      node.as = "worker";
+      if (node.as != "worker") {
+        resolve();
+      }
+      node.onload = resolve;
+      node.onerror = reject;
+      node.href = "dummy?dest=worker";
+      frame.contentWindow.document.body.appendChild(node);
+  }).catch(() => {
+      assert_unreached("Fetch errored.");
+  });
+}, 'HTMLLinkElement with rel=preload and as=worker fetches with a "worker" Request.destination');
+
+// HTMLLinkElement with rel=preload and as=sharedworker - sharedworker destination
+promise_test(async t => {
+  await new Promise((resolve, reject) => {
+      let node = frame.contentWindow.document.createElement("link");
+      node.rel = "preload";
+      node.as = "sharedworker";
+      if (node.as != "sharedworker") {
+        resolve();
+      }
+      node.onload = resolve;
+      node.onerror = reject;
+      node.href = "dummy?dest=sharedworker";
+      frame.contentWindow.document.body.appendChild(node);
+  }).catch(() => {
+      assert_unreached("Fetch errored.");
+  });
+}, 'HTMLLinkElement with rel=preload and as=sharedworker fetches with a "sharedworker" Request.destination');
+
+// HTMLLinkElement with rel=preload and as=xslt - xslt destination
+promise_test(async t => {
+  await new Promise((resolve, reject) => {
+      let node = frame.contentWindow.document.createElement("link");
+      node.rel = "preload";
+      node.as = "xslt";
+      if (node.as != "xslt") {
+        resolve();
+      }
+      node.onload = resolve;
+      node.onerror = reject;
+      node.href = "dummy?dest=xslt";
+      frame.contentWindow.document.body.appendChild(node);
+  }).catch(() => {
+      assert_unreached("Fetch errored.");
+  });
+}, 'HTMLLinkElement with rel=preload and as=xslt fetches with a "xslt" Request.destination');
+
+// HTMLLinkElement with rel=preload and as=manifest - manifest destination
+promise_test(async t => {
+  await new Promise((resolve, reject) => {
+      let node = frame.contentWindow.document.createElement("link");
+      node.rel = "preload";
+      node.as = "manifest";
+      if (node.as != "manifest") {
+        resolve();
+      }
+      node.onload = resolve;
+      node.onerror = reject;
+      node.href = "dummy?dest=manifest";
+      frame.contentWindow.document.body.appendChild(node);
+  }).catch(() => {
+      assert_unreached("Fetch errored.");
+  });
+}, 'HTMLLinkElement with rel=preload and as=manifest fetches with a "manifest" Request.destination');
+
+</script>
diff --git a/test/wpt/tests/fetch/api/request/destination/resources/dummy b/test/wpt/tests/fetch/api/request/destination/resources/dummy
new file mode 100644
index 00000000000..e69de29bb2d
diff --git a/test/wpt/tests/fetch/api/request/destination/resources/dummy.es b/test/wpt/tests/fetch/api/request/destination/resources/dummy.es
new file mode 100644
index 00000000000..e69de29bb2d
diff --git a/test/wpt/tests/fetch/api/request/destination/resources/dummy.es.headers b/test/wpt/tests/fetch/api/request/destination/resources/dummy.es.headers
new file mode 100644
index 00000000000..9bb8badcad4
--- /dev/null
+++ b/test/wpt/tests/fetch/api/request/destination/resources/dummy.es.headers
@@ -0,0 +1 @@
+Content-Type: text/event-stream
diff --git a/test/wpt/tests/fetch/api/request/destination/resources/dummy.html b/test/wpt/tests/fetch/api/request/destination/resources/dummy.html
new file mode 100644
index 00000000000..e69de29bb2d
diff --git a/test/wpt/tests/fetch/api/request/destination/resources/dummy.png b/test/wpt/tests/fetch/api/request/destination/resources/dummy.png
new file mode 100644
index 00000000000..01c9666a8de
Binary files /dev/null and b/test/wpt/tests/fetch/api/request/destination/resources/dummy.png differ
diff --git a/test/wpt/tests/fetch/api/request/destination/resources/dummy.ttf b/test/wpt/tests/fetch/api/request/destination/resources/dummy.ttf
new file mode 100644
index 00000000000..9023592ef5a
Binary files /dev/null and b/test/wpt/tests/fetch/api/request/destination/resources/dummy.ttf differ
diff --git a/test/wpt/tests/fetch/api/request/destination/resources/dummy_audio.mp3 b/test/wpt/tests/fetch/api/request/destination/resources/dummy_audio.mp3
new file mode 100644
index 00000000000..0091330f1ec
Binary files /dev/null and b/test/wpt/tests/fetch/api/request/destination/resources/dummy_audio.mp3 differ
diff --git a/test/wpt/tests/fetch/api/request/destination/resources/dummy_audio.oga b/test/wpt/tests/fetch/api/request/destination/resources/dummy_audio.oga
new file mode 100644
index 00000000000..239ad2bd08c
Binary files /dev/null and b/test/wpt/tests/fetch/api/request/destination/resources/dummy_audio.oga differ
diff --git a/test/wpt/tests/fetch/api/request/destination/resources/dummy_video.mp4 b/test/wpt/tests/fetch/api/request/destination/resources/dummy_video.mp4
new file mode 100644
index 00000000000..7022e75c15e
Binary files /dev/null and b/test/wpt/tests/fetch/api/request/destination/resources/dummy_video.mp4 differ
diff --git a/test/wpt/tests/fetch/api/request/destination/resources/dummy_video.ogv b/test/wpt/tests/fetch/api/request/destination/resources/dummy_video.ogv
new file mode 100644
index 00000000000..de99616eceb
Binary files /dev/null and b/test/wpt/tests/fetch/api/request/destination/resources/dummy_video.ogv differ
diff --git a/test/wpt/tests/fetch/api/request/destination/resources/empty.https.html b/test/wpt/tests/fetch/api/request/destination/resources/empty.https.html
new file mode 100644
index 00000000000..e69de29bb2d
diff --git a/test/wpt/tests/fetch/api/request/destination/resources/fetch-destination-worker-frame.js b/test/wpt/tests/fetch/api/request/destination/resources/fetch-destination-worker-frame.js
new file mode 100644
index 00000000000..b69de0b7df9
--- /dev/null
+++ b/test/wpt/tests/fetch/api/request/destination/resources/fetch-destination-worker-frame.js
@@ -0,0 +1,20 @@
+self.addEventListener('fetch', function(event) {
+    if (event.request.url.includes('dummy')) {
+        event.waitUntil(async function() {
+            let destination = new URL(event.request.url).searchParams.get("dest");
+            let clients = await self.clients.matchAll({"includeUncontrolled": true});
+            clients.forEach(function(client) {
+                if (client.url.includes("fetch-destination-frame")) {
+                    if (event.request.destination == destination) {
+                        client.postMessage("PASS");
+                    } else {
+                        client.postMessage("FAIL");
+                    }
+                }
+            })
+        }());
+    }
+    event.respondWith(fetch(event.request));
+});
+
+
diff --git a/test/wpt/tests/fetch/api/request/destination/resources/fetch-destination-worker-iframe.js b/test/wpt/tests/fetch/api/request/destination/resources/fetch-destination-worker-iframe.js
new file mode 100644
index 00000000000..76345839ead
--- /dev/null
+++ b/test/wpt/tests/fetch/api/request/destination/resources/fetch-destination-worker-iframe.js
@@ -0,0 +1,20 @@
+self.addEventListener('fetch', function(event) {
+    if (event.request.url.includes('dummy')) {
+        event.waitUntil(async function() {
+            let destination = new URL(event.request.url).searchParams.get("dest");
+            let clients = await self.clients.matchAll({"includeUncontrolled": true});
+            clients.forEach(function(client) {
+                if (client.url.includes("fetch-destination-iframe")) {
+                    if (event.request.destination == destination) {
+                        client.postMessage("PASS");
+                    } else {
+                        client.postMessage("FAIL");
+                    }
+                }
+            })
+        }());
+    }
+    event.respondWith(fetch(event.request));
+});
+
+
diff --git a/test/wpt/tests/fetch/api/request/destination/resources/fetch-destination-worker-no-load-event.js b/test/wpt/tests/fetch/api/request/destination/resources/fetch-destination-worker-no-load-event.js
new file mode 100644
index 00000000000..a583b1272a1
--- /dev/null
+++ b/test/wpt/tests/fetch/api/request/destination/resources/fetch-destination-worker-no-load-event.js
@@ -0,0 +1,20 @@
+self.addEventListener('fetch', function(event) {
+    const url = event.request.url;
+    if (url.includes('dummy') && url.includes('?')) {
+        event.waitUntil(async function() {
+            let destination = new URL(url).searchParams.get("dest");
+            var result = "FAIL";
+            if (event.request.destination == destination ||
+                (event.request.destination == "empty" && destination == "")) {
+              result = "PASS";
+            }
+            let cl = await clients.matchAll({includeUncontrolled: true});
+            for (i = 0; i < cl.length; i++) {
+              cl[i].postMessage(result);
+            }
+        }())
+    }
+    event.respondWith(fetch(event.request));
+});
+
+
diff --git a/test/wpt/tests/fetch/api/request/destination/resources/fetch-destination-worker.js b/test/wpt/tests/fetch/api/request/destination/resources/fetch-destination-worker.js
new file mode 100644
index 00000000000..904009c1721
--- /dev/null
+++ b/test/wpt/tests/fetch/api/request/destination/resources/fetch-destination-worker.js
@@ -0,0 +1,12 @@
+self.addEventListener('fetch', function(event) {
+    if (event.request.url.includes('dummy')) {
+        let destination = new URL(event.request.url).searchParams.get("dest");
+        if (event.request.destination == destination ||
+            (event.request.destination == "empty" && destination == "")) {
+            event.respondWith(fetch(event.request));
+        } else {
+            event.respondWith(Response.error());
+        }
+    }
+});
+
diff --git a/test/wpt/tests/fetch/api/request/destination/resources/importer.js b/test/wpt/tests/fetch/api/request/destination/resources/importer.js
new file mode 100644
index 00000000000..9568474d505
--- /dev/null
+++ b/test/wpt/tests/fetch/api/request/destination/resources/importer.js
@@ -0,0 +1 @@
+importScripts("dummy?t=importScripts&dest=script");
diff --git a/test/wpt/tests/fetch/api/request/multi-globals/current/current.html b/test/wpt/tests/fetch/api/request/multi-globals/current/current.html
new file mode 100644
index 00000000000..9bb6e0bbf3f
--- /dev/null
+++ b/test/wpt/tests/fetch/api/request/multi-globals/current/current.html
@@ -0,0 +1,3 @@
+<!DOCTYPE html>
+<title>Current page used as a test helper</title>
+<base href="success/">
diff --git a/test/wpt/tests/fetch/api/request/multi-globals/incumbent/incumbent.html b/test/wpt/tests/fetch/api/request/multi-globals/incumbent/incumbent.html
new file mode 100644
index 00000000000..a885b8a0a73
--- /dev/null
+++ b/test/wpt/tests/fetch/api/request/multi-globals/incumbent/incumbent.html
@@ -0,0 +1,14 @@
+<!DOCTYPE html>
+<title>Incumbent page used as a test helper</title>
+
+<iframe src="../current/current.html" id="c"></iframe>
+
+<script>
+'use strict';
+
+window.createRequest = (...args) => {
+    const current = document.querySelector('#c').contentWindow;
+    return new current.Request(...args);
+};
+
+</script>
diff --git a/test/wpt/tests/fetch/api/request/multi-globals/url-parsing.html b/test/wpt/tests/fetch/api/request/multi-globals/url-parsing.html
new file mode 100644
index 00000000000..df60e72507f
--- /dev/null
+++ b/test/wpt/tests/fetch/api/request/multi-globals/url-parsing.html
@@ -0,0 +1,27 @@
+<!DOCTYPE html>
+<title>Request constructor URL parsing, with multiple globals in play</title>
+<link rel="help" href="https://fetch.spec.whatwg.org/#dom-request">
+<link rel="author" title="Domenic Denicola" href="mailto:d@domenic.me">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+
+<!-- This is the entry global -->
+
+<iframe src="incumbent/incumbent.html"></iframe>
+
+<script>
+'use strict';
+
+const loadPromise = new Promise(resolve => {
+    window.addEventListener("load", () => resolve());
+});
+
+promise_test(() => {
+    return loadPromise.then(() => {
+        const req = document.querySelector('iframe').contentWindow.createRequest("url");
+
+        assert_equals(req.url, new URL("current/success/url", location.href).href);
+    });
+}, "should parse the URL relative to the current settings object");
+
+</script>
diff --git a/test/wpt/tests/fetch/api/request/request-cache-default-conditional.any.js b/test/wpt/tests/fetch/api/request/request-cache-default-conditional.any.js
new file mode 100644
index 00000000000..c5b2001cc8f
--- /dev/null
+++ b/test/wpt/tests/fetch/api/request/request-cache-default-conditional.any.js
@@ -0,0 +1,170 @@
+// META: global=window,worker
+// META: title=Request cache - default with conditional requests
+// META: timeout=long
+// META: script=/common/utils.js
+// META: script=/common/get-host-info.sub.js
+// META: script=request-cache.js
+
+var tests = [
+  {
+    name: 'RequestCache "default" mode with an If-Modified-Since header (following a request without additional headers) is treated similarly to "no-store"',
+    state: "stale",
+    request_cache: ["default", "default"],
+    request_headers: [{}, {"If-Modified-Since": now.toGMTString()}],
+    expected_validation_headers: [false, false],
+    expected_no_cache_headers: [false, true],
+  },
+  {
+    name: 'RequestCache "default" mode with an If-Modified-Since header (following a request without additional headers) is treated similarly to "no-store"',
+    state: "fresh",
+    request_cache: ["default", "default"],
+    request_headers: [{}, {"If-Modified-Since": now.toGMTString()}],
+    expected_validation_headers: [false, false],
+    expected_no_cache_headers: [false, true],
+  },
+  {
+    name: 'RequestCache "default" mode with an If-Modified-Since header is treated similarly to "no-store"',
+    state: "stale",
+    request_cache: ["default", "default"],
+    request_headers: [{"If-Modified-Since": now.toGMTString()}, {}],
+    expected_validation_headers: [false, false],
+    expected_no_cache_headers: [true, false],
+  },
+  {
+    name: 'RequestCache "default" mode with an If-Modified-Since header is treated similarly to "no-store"',
+    state: "fresh",
+    request_cache: ["default", "default"],
+    request_headers: [{"If-Modified-Since": now.toGMTString()}, {}],
+    expected_validation_headers: [false, false],
+    expected_no_cache_headers: [true, false],
+  },
+  {
+    name: 'RequestCache "default" mode with an If-None-Match header (following a request without additional headers) is treated similarly to "no-store"',
+    state: "stale",
+    request_cache: ["default", "default"],
+    request_headers: [{}, {"If-None-Match": '"foo"'}],
+    expected_validation_headers: [false, false],
+    expected_no_cache_headers: [false, true],
+  },
+  {
+    name: 'RequestCache "default" mode with an If-None-Match header (following a request without additional headers) is treated similarly to "no-store"',
+    state: "fresh",
+    request_cache: ["default", "default"],
+    request_headers: [{}, {"If-None-Match": '"foo"'}],
+    expected_validation_headers: [false, false],
+    expected_no_cache_headers: [false, true],
+  },
+  {
+    name: 'RequestCache "default" mode with an If-None-Match header is treated similarly to "no-store"',
+    state: "stale",
+    request_cache: ["default", "default"],
+    request_headers: [{"If-None-Match": '"foo"'}, {}],
+    expected_validation_headers: [false, false],
+    expected_no_cache_headers: [true, false],
+  },
+  {
+    name: 'RequestCache "default" mode with an If-None-Match header is treated similarly to "no-store"',
+    state: "fresh",
+    request_cache: ["default", "default"],
+    request_headers: [{"If-None-Match": '"foo"'}, {}],
+    expected_validation_headers: [false, false],
+    expected_no_cache_headers: [true, false],
+  },
+  {
+    name: 'RequestCache "default" mode with an If-Unmodified-Since header (following a request without additional headers) is treated similarly to "no-store"',
+    state: "stale",
+    request_cache: ["default", "default"],
+    request_headers: [{}, {"If-Unmodified-Since": now.toGMTString()}],
+    expected_validation_headers: [false, false],
+    expected_no_cache_headers: [false, true],
+  },
+  {
+    name: 'RequestCache "default" mode with an If-Unmodified-Since header (following a request without additional headers) is treated similarly to "no-store"',
+    state: "fresh",
+    request_cache: ["default", "default"],
+    request_headers: [{}, {"If-Unmodified-Since": now.toGMTString()}],
+    expected_validation_headers: [false, false],
+    expected_no_cache_headers: [false, true],
+  },
+  {
+    name: 'RequestCache "default" mode with an If-Unmodified-Since header is treated similarly to "no-store"',
+    state: "stale",
+    request_cache: ["default", "default"],
+    request_headers: [{"If-Unmodified-Since": now.toGMTString()}, {}],
+    expected_validation_headers: [false, false],
+    expected_no_cache_headers: [true, false],
+  },
+  {
+    name: 'RequestCache "default" mode with an If-Unmodified-Since header is treated similarly to "no-store"',
+    state: "fresh",
+    request_cache: ["default", "default"],
+    request_headers: [{"If-Unmodified-Since": now.toGMTString()}, {}],
+    expected_validation_headers: [false, false],
+    expected_no_cache_headers: [true, false],
+  },
+  {
+    name: 'RequestCache "default" mode with an If-Match header (following a request without additional headers) is treated similarly to "no-store"',
+    state: "stale",
+    request_cache: ["default", "default"],
+    request_headers: [{}, {"If-Match": '"foo"'}],
+    expected_validation_headers: [false, false],
+    expected_no_cache_headers: [false, true],
+  },
+  {
+    name: 'RequestCache "default" mode with an If-Match header (following a request without additional headers) is treated similarly to "no-store"',
+    state: "fresh",
+    request_cache: ["default", "default"],
+    request_headers: [{}, {"If-Match": '"foo"'}],
+    expected_validation_headers: [false, false],
+    expected_no_cache_headers: [false, true],
+  },
+  {
+    name: 'RequestCache "default" mode with an If-Match header is treated similarly to "no-store"',
+    state: "stale",
+    request_cache: ["default", "default"],
+    request_headers: [{"If-Match": '"foo"'}, {}],
+    expected_validation_headers: [false, false],
+    expected_no_cache_headers: [true, false],
+  },
+  {
+    name: 'RequestCache "default" mode with an If-Match header is treated similarly to "no-store"',
+    state: "fresh",
+    request_cache: ["default", "default"],
+    request_headers: [{"If-Match": '"foo"'}, {}],
+    expected_validation_headers: [false, false],
+    expected_no_cache_headers: [true, false],
+  },
+  {
+    name: 'RequestCache "default" mode with an If-Range header (following a request without additional headers) is treated similarly to "no-store"',
+    state: "stale",
+    request_cache: ["default", "default"],
+    request_headers: [{}, {"If-Range": '"foo"'}],
+    expected_validation_headers: [false, false],
+    expected_no_cache_headers: [false, true],
+  },
+  {
+    name: 'RequestCache "default" mode with an If-Range header (following a request without additional headers) is treated similarly to "no-store"',
+    state: "fresh",
+    request_cache: ["default", "default"],
+    request_headers: [{}, {"If-Range": '"foo"'}],
+    expected_validation_headers: [false, false],
+    expected_no_cache_headers: [false, true],
+  },
+  {
+    name: 'RequestCache "default" mode with an If-Range header is treated similarly to "no-store"',
+    state: "stale",
+    request_cache: ["default", "default"],
+    request_headers: [{"If-Range": '"foo"'}, {}],
+    expected_validation_headers: [false, false],
+    expected_no_cache_headers: [true, false],
+  },
+  {
+    name: 'RequestCache "default" mode with an If-Range header is treated similarly to "no-store"',
+    state: "fresh",
+    request_cache: ["default", "default"],
+    request_headers: [{"If-Range": '"foo"'}, {}],
+    expected_validation_headers: [false, false],
+    expected_no_cache_headers: [true, false],
+  },
+];
+run_tests(tests);
diff --git a/test/wpt/tests/fetch/api/request/request-cache-default.any.js b/test/wpt/tests/fetch/api/request/request-cache-default.any.js
new file mode 100644
index 00000000000..dfa8369c9a3
--- /dev/null
+++ b/test/wpt/tests/fetch/api/request/request-cache-default.any.js
@@ -0,0 +1,39 @@
+// META: global=window,worker
+// META: title=Request cache - default
+// META: script=/common/utils.js
+// META: script=/common/get-host-info.sub.js
+// META: script=request-cache.js
+
+var tests = [
+  {
+    name: 'RequestCache "default" mode checks the cache for previously cached content and goes to the network for stale responses',
+    state: "stale",
+    request_cache: ["default", "default"],
+    expected_validation_headers: [false, true],
+    expected_no_cache_headers: [false, false],
+  },
+  {
+    name: 'RequestCache "default" mode checks the cache for previously cached content and avoids going to the network if a fresh response exists',
+    state: "fresh",
+    request_cache: ["default", "default"],
+    expected_validation_headers: [false],
+    expected_no_cache_headers: [false],
+  },
+  {
+    name: 'Responses with the "Cache-Control: no-store" header are not stored in the cache',
+    state: "stale",
+    cache_control: "no-store",
+    request_cache: ["default", "default"],
+    expected_validation_headers: [false, false],
+    expected_no_cache_headers: [false, false],
+  },
+  {
+    name: 'Responses with the "Cache-Control: no-store" header are not stored in the cache',
+    state: "fresh",
+    cache_control: "no-store",
+    request_cache: ["default", "default"],
+    expected_validation_headers: [false, false],
+    expected_no_cache_headers: [false, false],
+  },
+];
+run_tests(tests);
diff --git a/test/wpt/tests/fetch/api/request/request-cache-force-cache.any.js b/test/wpt/tests/fetch/api/request/request-cache-force-cache.any.js
new file mode 100644
index 00000000000..00dce096c72
--- /dev/null
+++ b/test/wpt/tests/fetch/api/request/request-cache-force-cache.any.js
@@ -0,0 +1,67 @@
+// META: global=window,worker
+// META: title=Request cache - force-cache
+// META: script=/common/utils.js
+// META: script=/common/get-host-info.sub.js
+// META: script=request-cache.js
+
+var tests = [
+  {
+    name: 'RequestCache "force-cache" mode checks the cache for previously cached content and avoid revalidation for stale responses',
+    state: "stale",
+    request_cache: ["default", "force-cache"],
+    expected_validation_headers: [false],
+    expected_no_cache_headers: [false],
+  },
+  {
+    name: 'RequestCache "force-cache" mode checks the cache for previously cached content and avoid revalidation for fresh responses',
+    state: "fresh",
+    request_cache: ["default", "force-cache"],
+    expected_validation_headers: [false],
+    expected_no_cache_headers: [false],
+  },
+  {
+    name: 'RequestCache "force-cache" mode checks the cache for previously cached content and goes to the network if a cached response is not found',
+    state: "stale",
+    request_cache: ["force-cache"],
+    expected_validation_headers: [false],
+    expected_no_cache_headers: [false],
+  },
+  {
+    name: 'RequestCache "force-cache" mode checks the cache for previously cached content and goes to the network if a cached response is not found',
+    state: "fresh",
+    request_cache: ["force-cache"],
+    expected_validation_headers: [false],
+    expected_no_cache_headers: [false],
+  },
+  {
+    name: 'RequestCache "force-cache" mode checks the cache for previously cached content and goes to the network if a cached response would vary',
+    state: "stale",
+    vary: "*",
+    request_cache: ["default", "force-cache"],
+    expected_validation_headers: [false, true],
+    expected_no_cache_headers: [false, false],
+  },
+  {
+    name: 'RequestCache "force-cache" mode checks the cache for previously cached content and goes to the network if a cached response would vary',
+    state: "fresh",
+    vary: "*",
+    request_cache: ["default", "force-cache"],
+    expected_validation_headers: [false, true],
+    expected_no_cache_headers: [false, false],
+  },
+  {
+    name: 'RequestCache "force-cache" stores the response in the cache if it goes to the network',
+    state: "stale",
+    request_cache: ["force-cache", "default"],
+    expected_validation_headers: [false, true],
+    expected_no_cache_headers: [false, false],
+  },
+  {
+    name: 'RequestCache "force-cache" stores the response in the cache if it goes to the network',
+    state: "fresh",
+    request_cache: ["force-cache", "default"],
+    expected_validation_headers: [false],
+    expected_no_cache_headers: [false],
+  },
+];
+run_tests(tests);
diff --git a/test/wpt/tests/fetch/api/request/request-cache-no-cache.any.js b/test/wpt/tests/fetch/api/request/request-cache-no-cache.any.js
new file mode 100644
index 00000000000..41fc22baf23
--- /dev/null
+++ b/test/wpt/tests/fetch/api/request/request-cache-no-cache.any.js
@@ -0,0 +1,25 @@
+// META: global=window,worker
+// META: title=Request cache : no-cache
+// META: script=/common/utils.js
+// META: script=/common/get-host-info.sub.js
+// META: script=request-cache.js
+
+var tests = [
+  {
+    name: 'RequestCache "no-cache" mode revalidates stale responses found in the cache',
+    state: "stale",
+    request_cache: ["default", "no-cache"],
+    expected_validation_headers: [false, true],
+    expected_no_cache_headers: [false, false],
+    expected_max_age_headers: [false, true],
+  },
+  {
+    name: 'RequestCache "no-cache" mode revalidates fresh responses found in the cache',
+    state: "fresh",
+    request_cache: ["default", "no-cache"],
+    expected_validation_headers: [false, true],
+    expected_no_cache_headers: [false, false],
+    expected_max_age_headers: [false, true],
+  },
+];
+run_tests(tests);
diff --git a/test/wpt/tests/fetch/api/request/request-cache-no-store.any.js b/test/wpt/tests/fetch/api/request/request-cache-no-store.any.js
new file mode 100644
index 00000000000..9a28718bf22
--- /dev/null
+++ b/test/wpt/tests/fetch/api/request/request-cache-no-store.any.js
@@ -0,0 +1,37 @@
+// META: global=window,worker
+// META: title=Request cache - no store
+// META: script=/common/utils.js
+// META: script=/common/get-host-info.sub.js
+// META: script=request-cache.js
+
+var tests = [
+  {
+    name: 'RequestCache "no-store" mode does not check the cache for previously cached content and goes to the network regardless',
+    state: "stale",
+    request_cache: ["default", "no-store"],
+    expected_validation_headers: [false, false],
+    expected_no_cache_headers: [false, true],
+  },
+  {
+    name: 'RequestCache "no-store" mode does not check the cache for previously cached content and goes to the network regardless',
+    state: "fresh",
+    request_cache: ["default", "no-store"],
+    expected_validation_headers: [false, false],
+    expected_no_cache_headers: [false, true],
+  },
+  {
+    name: 'RequestCache "no-store" mode does not store the response in the cache',
+    state: "stale",
+    request_cache: ["no-store", "default"],
+    expected_validation_headers: [false, false],
+    expected_no_cache_headers: [true, false],
+  },
+  {
+    name: 'RequestCache "no-store" mode does not store the response in the cache',
+    state: "fresh",
+    request_cache: ["no-store", "default"],
+    expected_validation_headers: [false, false],
+    expected_no_cache_headers: [true, false],
+  },
+];
+run_tests(tests);
diff --git a/test/wpt/tests/fetch/api/request/request-cache-only-if-cached.any.js b/test/wpt/tests/fetch/api/request/request-cache-only-if-cached.any.js
new file mode 100644
index 00000000000..1305787c7c1
--- /dev/null
+++ b/test/wpt/tests/fetch/api/request/request-cache-only-if-cached.any.js
@@ -0,0 +1,66 @@
+// META: global=window,dedicatedworker,sharedworker
+// META: title=Request cache - only-if-cached
+// META: script=/common/utils.js
+// META: script=/common/get-host-info.sub.js
+// META: script=request-cache.js
+
+// FIXME: avoid mixed content requests to enable service worker global
+var tests = [
+  {
+    name: 'RequestCache "only-if-cached" mode checks the cache for previously cached content and avoids revalidation for stale responses',
+    state: "stale",
+    request_cache: ["default", "only-if-cached"],
+    expected_validation_headers: [false],
+    expected_no_cache_headers: [false]
+  },
+  {
+    name: 'RequestCache "only-if-cached" mode checks the cache for previously cached content and avoids revalidation for fresh responses',
+    state: "fresh",
+    request_cache: ["default", "only-if-cached"],
+    expected_validation_headers: [false],
+    expected_no_cache_headers: [false]
+  },
+  {
+    name: 'RequestCache "only-if-cached" mode checks the cache for previously cached content and does not go to the network if a cached response is not found',
+    state: "fresh",
+    request_cache: ["only-if-cached"],
+    response: ["error"],
+    expected_validation_headers: [],
+    expected_no_cache_headers: []
+  },
+  {
+    name: 'RequestCache "only-if-cached" (with "same-origin") uses cached same-origin redirects to same-origin content',
+    state: "fresh",
+    request_cache: ["default", "only-if-cached"],
+    redirect: "same-origin",
+    expected_validation_headers: [false, false],
+    expected_no_cache_headers: [false, false],
+  },
+  {
+    name: 'RequestCache "only-if-cached" (with "same-origin") uses cached same-origin redirects to same-origin content',
+    state: "stale",
+    request_cache: ["default", "only-if-cached"],
+    redirect: "same-origin",
+    expected_validation_headers: [false, false],
+    expected_no_cache_headers: [false, false],
+  },
+  {
+    name: 'RequestCache "only-if-cached" (with "same-origin") does not follow redirects across origins and rejects',
+    state: "fresh",
+    request_cache: ["default", "only-if-cached"],
+    redirect: "cross-origin",
+    response: [null, "error"],
+    expected_validation_headers: [false, false],
+    expected_no_cache_headers: [false, false],
+  },
+  {
+    name: 'RequestCache "only-if-cached" (with "same-origin") does not follow redirects across origins and rejects',
+    state: "stale",
+    request_cache: ["default", "only-if-cached"],
+    redirect: "cross-origin",
+    response: [null, "error"],
+    expected_validation_headers: [false, false],
+    expected_no_cache_headers: [false, false],
+  },
+];
+run_tests(tests);
diff --git a/test/wpt/tests/fetch/api/request/request-cache-reload.any.js b/test/wpt/tests/fetch/api/request/request-cache-reload.any.js
new file mode 100644
index 00000000000..c7bfffb3988
--- /dev/null
+++ b/test/wpt/tests/fetch/api/request/request-cache-reload.any.js
@@ -0,0 +1,51 @@
+// META: global=window,worker
+// META: title=Request cache - reload
+// META: script=/common/utils.js
+// META: script=/common/get-host-info.sub.js
+// META: script=request-cache.js
+
+var tests = [
+  {
+    name: 'RequestCache "reload" mode does not check the cache for previously cached content and goes to the network regardless',
+    state: "stale",
+    request_cache: ["default", "reload"],
+    expected_validation_headers: [false, false],
+    expected_no_cache_headers: [false, true],
+  },
+  {
+    name: 'RequestCache "reload" mode does not check the cache for previously cached content and goes to the network regardless',
+    state: "fresh",
+    request_cache: ["default", "reload"],
+    expected_validation_headers: [false, false],
+    expected_no_cache_headers: [false, true],
+  },
+  {
+    name: 'RequestCache "reload" mode does store the response in the cache',
+    state: "stale",
+    request_cache: ["reload", "default"],
+    expected_validation_headers: [false, true],
+    expected_no_cache_headers: [true, false],
+  },
+  {
+    name: 'RequestCache "reload" mode does store the response in the cache',
+    state: "fresh",
+    request_cache: ["reload", "default"],
+    expected_validation_headers: [false],
+    expected_no_cache_headers: [true],
+  },
+  {
+    name: 'RequestCache "reload" mode does store the response in the cache even if a previous response is already stored',
+    state: "stale",
+    request_cache: ["default", "reload", "default"],
+    expected_validation_headers: [false, false, true],
+    expected_no_cache_headers: [false, true, false],
+  },
+  {
+    name: 'RequestCache "reload" mode does store the response in the cache even if a previous response is already stored',
+    state: "fresh",
+    request_cache: ["default", "reload", "default"],
+    expected_validation_headers: [false, false],
+    expected_no_cache_headers: [false, true],
+  },
+];
+run_tests(tests);
diff --git a/test/wpt/tests/fetch/api/request/request-cache.js b/test/wpt/tests/fetch/api/request/request-cache.js
new file mode 100644
index 00000000000..f2fbecf4969
--- /dev/null
+++ b/test/wpt/tests/fetch/api/request/request-cache.js
@@ -0,0 +1,223 @@
+/**
+ * Each test is run twice: once using etag/If-None-Match and once with
+ * date/If-Modified-Since.  Each test run gets its own URL and randomized
+ * content and operates independently.
+ *
+ * The test steps are run with request_cache.length fetch requests issued
+ * and their immediate results sanity-checked.  The cache.py server script
+ * stashes an entry containing any If-None-Match, If-Modified-Since, Pragma,
+ * and Cache-Control observed headers for each request it receives.  When
+ * the test fetches have run, this state is retrieved from cache.py and the
+ * expected_* lists are checked, including their length.
+ *
+ * This means that if a request_* fetch is expected to hit the cache and not
+ * touch the network, then there will be no entry for it in the expect_*
+ * lists.  AKA (request_cache.length - expected_validation_headers.length)
+ * should equal the number of cache hits that didn't touch the network.
+ *
+ * Test dictionary keys:
+ * - state: required string that determines whether the Expires response for
+ *   the fetched document should be set in the future ("fresh") or past
+ *   ("stale").
+ * - vary: optional string to be passed to the server for it to quote back
+ *   in a Vary header on the response to us.
+ * - cache_control: optional string to be passed to the server for it to
+ *   quote back in a Cache-Control header on the response to us.
+ * - redirect: optional string "same-origin" or "cross-origin".  If
+ *   provided, the server will issue an absolute redirect to the script on
+ *   the same or a different origin, as appropriate.  The redirected
+ *   location is the script with the redirect parameter removed, so the
+ *   content/state/etc. will be as if you hadn't specified a redirect.
+ * - request_cache: required array of cache modes to use (via `cache`).
+ * - request_headers: optional array of explicit fetch `headers` arguments.
+ *   If provided, the server will log an empty dictionary for each request
+ *   instead of the request headers it would normally log.
+ * - response: optional array of specialized response handling.  Right now,
+ *   "error" array entries indicate a network error response is expected
+ *   which will reject with a TypeError.
+ * - expected_validation_headers: required boolean array indicating whether
+ *   the server should have seen an If-None-Match/If-Modified-Since header
+ *   in the request.
+ * - expected_no_cache_headers: required boolean array indicating whether
+ *   the server should have seen Pragma/Cache-control:no-cache headers in
+ *   the request.
+ * - expected_max_age_headers: optional boolean array indicating whether
+ *   the server should have seen a Cache-Control:max-age=0 header in the
+ *   request.
+ */
+
+var now = new Date();
+
+function base_path() {
+  return location.pathname.replace(/\/[^\/]*$/, '/');
+}
+function make_url(uuid, id, value, content, info) {
+  var dates = {
+    fresh: new Date(now.getFullYear() + 1, now.getMonth(), now.getDay()).toGMTString(),
+    stale: new Date(now.getFullYear() - 1, now.getMonth(), now.getDay()).toGMTString(),
+  };
+  var vary = "";
+  if ("vary" in info) {
+    vary = "&vary=" + info.vary;
+  }
+  var cache_control = "";
+  if ("cache_control" in info) {
+    cache_control = "&cache_control=" + info.cache_control;
+  }
+  var redirect = "";
+
+  var ignore_request_headers = "";
+  if ("request_headers" in info) {
+    // Ignore the request headers that we send since they may be synthesized by the test.
+    ignore_request_headers = "&ignore";
+  }
+  var url_sans_redirect = "resources/cache.py?token=" + uuid +
+    "&content=" + content +
+    "&" + id + "=" + value +
+    "&expires=" + dates[info.state] +
+    vary + cache_control + ignore_request_headers;
+  // If there's a redirect, the target is the script without any redirect at
+  // either the same domain or a different domain.
+  if ("redirect" in info) {
+    var host_info = get_host_info();
+    var origin;
+    switch (info.redirect) {
+      case "same-origin":
+        origin = host_info['HTTP_ORIGIN'];
+        break;
+      case "cross-origin":
+        origin = host_info['HTTP_REMOTE_ORIGIN'];
+        break;
+    }
+    var redirected_url = origin + base_path() + url_sans_redirect;
+    return url_sans_redirect + "&redirect=" + encodeURIComponent(redirected_url);
+  } else {
+    return url_sans_redirect;
+  }
+}
+function expected_status(type, identifier, init) {
+  if (type == "date" &&
+      init.headers &&
+      init.headers["If-Modified-Since"] == identifier) {
+    // The server will respond with a 304 in this case.
+    return [304, "Not Modified"];
+  }
+  return [200, "OK"];
+}
+function expected_response_text(type, identifier, init, content) {
+  if (type == "date" &&
+      init.headers &&
+      init.headers["If-Modified-Since"] == identifier) {
+    // The server will respond with a 304 in this case.
+    return "";
+  }
+  return content;
+}
+function server_state(uuid) {
+  return fetch("resources/cache.py?querystate&token=" + uuid)
+    .then(function(response) {
+      return response.text();
+    }).then(function(text) {
+      // null will be returned if the server never received any requests
+      // for the given uuid.  Normalize that to an empty list consistent
+      // with our representation.
+      return JSON.parse(text) || [];
+    });
+}
+function make_test(type, info) {
+  return function(test) {
+    var uuid = token();
+    var identifier = (type == "tag" ? Math.random() : now.toGMTString());
+    var content = Math.random().toString();
+    var url = make_url(uuid, type, identifier, content, info);
+    var fetch_functions = [];
+    for (var i = 0; i < info.request_cache.length; ++i) {
+      fetch_functions.push(function(idx) {
+        var init = {cache: info.request_cache[idx]};
+        if ("request_headers" in info) {
+          init.headers = info.request_headers[idx];
+        }
+        if (init.cache === "only-if-cached") {
+          // only-if-cached requires we use same-origin mode.
+          init.mode = "same-origin";
+        }
+        return fetch(url, init)
+          .then(function(response) {
+            if ("response" in info && info.response[idx] === "error") {
+              assert_true(false, "fetch should have been an error");
+              return;
+            }
+            assert_array_equals([response.status, response.statusText],
+                                expected_status(type, identifier, init));
+            return response.text();
+          }).then(function(text) {
+            assert_equals(text, expected_response_text(type, identifier, init, content));
+          }, function(reason) {
+            if ("response" in info && info.response[idx] === "error") {
+              assert_throws_js(TypeError, function() { throw reason; });
+            } else {
+              throw reason;
+            }
+          });
+      });
+    }
+    var i = 0;
+    function run_next_step() {
+      if (fetch_functions.length) {
+        return fetch_functions.shift()(i++)
+          .then(run_next_step);
+      } else {
+        return Promise.resolve();
+      }
+    }
+    return run_next_step()
+      .then(function() {
+        // Now, query the server state
+        return server_state(uuid);
+      }).then(function(state) {
+        var expectedState = [];
+        info.expected_validation_headers.forEach(function (validate) {
+          if (validate) {
+            if (type == "tag") {
+              expectedState.push({"If-None-Match": '"' + identifier + '"'});
+            } else {
+              expectedState.push({"If-Modified-Since": identifier});
+            }
+          } else {
+            expectedState.push({});
+          }
+        });
+        for (var i = 0; i < info.expected_no_cache_headers.length; ++i) {
+          if (info.expected_no_cache_headers[i]) {
+            expectedState[i]["Pragma"] = "no-cache";
+            expectedState[i]["Cache-Control"] = "no-cache";
+          }
+        }
+        if ("expected_max_age_headers" in info) {
+          for (var i = 0; i < info.expected_max_age_headers.length; ++i) {
+            if (info.expected_max_age_headers[i]) {
+              expectedState[i]["Cache-Control"] = "max-age=0";
+            }
+          }
+        }
+        assert_equals(state.length, expectedState.length);
+        for (var i = 0; i < state.length; ++i) {
+          for (var header in state[i]) {
+            assert_equals(state[i][header], expectedState[i][header]);
+            delete expectedState[i][header];
+          }
+          for (var header in expectedState[i]) {
+            assert_false(header in state[i]);
+          }
+        }
+      });
+  };
+}
+
+function run_tests(tests)
+{
+  tests.forEach(function(info) {
+    promise_test(make_test("tag", info), info.name + " with Etag and " + info.state + " response");
+    promise_test(make_test("date", info), info.name + " with Last-Modified and " + info.state + " response");
+  });
+}
diff --git a/test/wpt/tests/fetch/api/request/request-clone.sub.html b/test/wpt/tests/fetch/api/request/request-clone.sub.html
new file mode 100644
index 00000000000..c690bb3dc03
--- /dev/null
+++ b/test/wpt/tests/fetch/api/request/request-clone.sub.html
@@ -0,0 +1,63 @@
+<!doctype html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>Request clone</title>
+    <meta name="help" href="https://fetch.spec.whatwg.org/#request">
+    <meta name="author" title="Canon Research France" href="https://www.crf.canon.fr">
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <script src="../resources/utils.js"></script>
+  </head>
+  <body>
+    <script>
+      var headers = new Headers({"name" : "value"});
+      var emptyHeaders = new Headers();
+
+      var initValuesDict = {"method" : "POST",
+                            "referrer" : "http://{{host}}:{{ports[http][0]}}/",
+                            "referrerPolicy" : "origin",
+                            "mode" : "same-origin",
+                            "credentials" : "include",
+                            "cache" : "no-cache",
+                            "redirect" : "error",
+                            "integrity" : "Request's Integrity",
+                            "headers" : headers,
+                            "body" : "Request's body"
+      };
+
+      var expectedInitialized = {"method" : "POST",
+                                 "referrer" : "http://{{host}}:{{ports[http][0]}}/",
+                                 "referrerPolicy" : "origin",
+                                 "mode" : "same-origin",
+                                 "credentials" : "include",
+                                 "cache" : "no-cache",
+                                 "redirect" : "error",
+                                 "integrity" : "Request's Integrity",
+                                 "headers" : headers,
+                                 "body" : "Request's body"
+      };
+
+      test(function() {
+        var RequestInitialized = new Request("", initValuesDict);
+        var requestToCheck = RequestInitialized.clone();
+        checkRequest(requestToCheck, expectedInitialized);
+      }, "Check cloning a request");
+
+      test(function() {
+        var initialRequest = new Request("", {"headers" : new Headers({"a": "1", "b" : "2"})});
+        var request = initialRequest.clone();
+        assert_equals(request.headers.get("a"), "1", "cloned request should have header 'a'");
+        assert_equals(request.headers.get("b"), "2", "cloned request should have header 'b'");
+
+        initialRequest.headers.delete("a");
+        assert_equals(request.headers.get("a"), "1", "cloned request should still have header 'a'");
+
+        request.headers.delete("a");
+        assert_equals(initialRequest.headers.get("b"), "2", "initial request should have header 'b'");
+
+      }, "Check cloning a request copies the headers");
+
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/fetch/api/request/request-headers.any.js b/test/wpt/tests/fetch/api/request/request-headers.any.js
index cb34e5a790a..6de5dc16e96 100644
--- a/test/wpt/tests/fetch/api/request/request-headers.any.js
+++ b/test/wpt/tests/fetch/api/request/request-headers.any.js
@@ -17,6 +17,7 @@ var invalidRequestHeaders = [
   ["Accept-Encoding", "KO"],
   ["Access-Control-Request-Headers", "KO"],
   ["Access-Control-Request-Method", "KO"],
+  ["Access-Control-Request-Private-Network", "KO"],
   ["Connection", "KO"],
   ["Content-Length", "KO"],
   ["Cookie", "KO"],
@@ -58,6 +59,7 @@ var invalidRequestNoCorsHeaders = [
   ["proxya", "KO"],
   ["sec", "KO"],
   ["secb", "KO"],
+  ["Empty-Value", ""],
 ];
 
 validRequestHeaders.forEach(function(header) {
diff --git a/test/wpt/tests/fetch/api/request/request-init-001.sub.html b/test/wpt/tests/fetch/api/request/request-init-001.sub.html
new file mode 100644
index 00000000000..cc495a66527
--- /dev/null
+++ b/test/wpt/tests/fetch/api/request/request-init-001.sub.html
@@ -0,0 +1,112 @@
+<!doctype html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>Request init: simple cases</title>
+    <meta name="help" href="https://fetch.spec.whatwg.org/#request">
+    <meta name="author" title="Canon Research France" href="https://www.crf.canon.fr">
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+  </head>
+  <body>
+    <script>
+      // https://fetch.spec.whatwg.org/#concept-method-normalize
+      var methods = {
+        "givenValues" : [
+          "GET", "HEAD", "POST", "PUT", "DELETE", "OPTIONS",
+          "get", "head", "post", "put", "delete", "options",
+          "Get", "hEad", "poSt", "Put", "deleTe", "optionS",
+          "PATCH", "patch", "patCh"
+        ],
+        "expectedValues" : [
+          "GET", "HEAD", "POST", "PUT", "DELETE", "OPTIONS",
+          "GET", "HEAD", "POST", "PUT", "DELETE", "OPTIONS",
+          "GET", "HEAD", "POST", "PUT", "DELETE", "OPTIONS",
+          "PATCH", "patch", "patCh"
+        ]
+      };
+      var referrers = {"givenValues" : ["/relative/ressource",
+                                        "http://{{host}}:{{ports[http][0]}}/relative/ressource?query=true#fragment",
+                                        "http://{{host}}:{{ports[http][0]}}/",
+                                        "http://test.url",
+                                        "about:client",
+                                        ""
+                                       ],
+                       "expectedValues" : ["http://{{host}}:{{ports[http][0]}}/relative/ressource",
+                                           "http://{{host}}:{{ports[http][0]}}/relative/ressource?query=true#fragment",
+                                           "http://{{host}}:{{ports[http][0]}}/",
+                                           "about:client",
+                                           "about:client",
+                                           ""
+                                          ]
+      };
+      var referrerPolicies = {"givenValues" : [ "",
+                                                "no-referrer",
+                                                "no-referrer-when-downgrade",
+                                                "origin",
+                                                "origin-when-cross-origin",
+                                                "unsafe-url",
+                                                "same-origin",
+                                                "strict-origin",
+                                                "strict-origin-when-cross-origin"
+                                              ],
+                              "expectedValues" : ["",
+                                                  "no-referrer",
+                                                  "no-referrer-when-downgrade",
+                                                  "origin",
+                                                  "origin-when-cross-origin",
+                                                  "unsafe-url",
+                                                  "same-origin",
+                                                  "strict-origin",
+                                                  "strict-origin-when-cross-origin"
+                                                  ]
+      };
+      var modes = {"givenValues" : ["same-origin", "no-cors", "cors"],
+                   "expectedValues" : ["same-origin", "no-cors", "cors"]
+      };
+      var credentials = {"givenValues" : ["omit", "same-origin", "include"],
+                          "expectedValues" : ["omit", "same-origin", "include"]
+      };
+      var caches = {"givenValues" : [ "default", "no-store", "reload", "no-cache", "force-cache"],
+                    "expectedValues" : [ "default", "no-store", "reload", "no-cache", "force-cache"]
+      };
+      var redirects = {"givenValues" : ["follow", "error", "manual"],
+                       "expectedValues" : ["follow", "error", "manual"]
+      };
+      var integrities = {"givenValues" : ["", "AZERTYUIOP1234567890" ],
+                         "expectedValues" : ["", "AZERTYUIOP1234567890"]
+      };
+
+      //there is no getter for window, init's window might be null
+      var windows = {"givenValues" : [ null ],
+                     "expectedValues" : [undefined]
+      };
+
+      var initValuesDict = { "method" : methods,
+                             "referrer" : referrers,
+                             "referrerPolicy" : referrerPolicies,
+                             "mode" : modes,
+                             "credentials" : credentials,
+                             "cache" : caches,
+                             "redirect" : redirects,
+                             "integrity" : integrities,
+                             "window" : windows
+      };
+
+      for (var attributeName in initValuesDict) {
+        var valuesToTest = initValuesDict[attributeName];
+        for (var valueIdx in valuesToTest["givenValues"]) {
+          var givenValue = valuesToTest["givenValues"][valueIdx];
+          var expectedValue = valuesToTest["expectedValues"][valueIdx];
+          test(function() {
+            var requestInit = {};
+            requestInit[attributeName] = givenValue
+            var request = new Request("", requestInit);
+            assert_equals(request[attributeName], expectedValue,
+              "Expect request's " + attributeName + " is " + expectedValue + " when initialized with " + givenValue);
+          }, "Check " + attributeName + " init value of " + givenValue + " and associated getter");
+        }
+      }
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/fetch/api/request/request-init-003.sub.html b/test/wpt/tests/fetch/api/request/request-init-003.sub.html
new file mode 100644
index 00000000000..79c91cdfe82
--- /dev/null
+++ b/test/wpt/tests/fetch/api/request/request-init-003.sub.html
@@ -0,0 +1,84 @@
+<!doctype html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>Request: init with request or url</title>
+    <meta name="help" href="https://fetch.spec.whatwg.org/#request">
+    <meta name="help" href="https://url.spec.whatwg.org/#concept-url-serializer">
+    <meta name="author" title="Canon Research France" href="https://www.crf.canon.fr">
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+  </head>
+  <body>
+    <script src="../resources/utils.js"></script>
+    <script>
+      var headers = new Headers( {"name":"value"} );
+      var emptyHeaders = new Headers();
+
+      var initValuesDict = {"method" : "POST",
+                            "referrer" : "http://{{host}}:{{ports[http][0]}}/",
+                            "referrerPolicy" : "origin",
+                            "mode" : "same-origin",
+                            "credentials" : "include",
+                            "cache" : "no-cache",
+                            "redirect" : "error",
+                            "integrity" : "Request's Integrity",
+                            "headers" : headers,
+                            "body" : "Request's body"
+      };
+
+      var expectedInitialized = {"method" : "POST",
+                                 "referrer" : "http://{{host}}:{{ports[http][0]}}/",
+                                 "referrerPolicy" : "origin",
+                                 "mode" : "same-origin",
+                                 "credentials" : "include",
+                                 "cache" : "no-cache",
+                                 "redirect" : "error",
+                                 "integrity" : "Request's Integrity",
+                                 "headers" : headers,
+                                 "body" : "Request's body"
+      };
+
+      var expectedDefault = {"method" : "GET",
+                             "url" : location.href,
+                             "referrer" : "about:client",
+                             "referrerPolicy" : "",
+                             "mode" : "cors",
+                             "credentials" : "same-origin",
+                             "cache" : "default",
+                             "redirect" : "follow",
+                             "integrity" : "",
+                             "headers" : emptyHeaders
+      };
+
+      var requestDefault = new Request("");
+      var requestInitialized = new Request("", initValuesDict);
+
+      test(function() {
+        var requestToCheck = new Request(requestInitialized);
+        checkRequest(requestToCheck, expectedInitialized);
+      }, "Check request values when initialized from Request");
+
+      test(function() {
+        var requestToCheck = new Request(requestDefault, initValuesDict);
+        checkRequest(requestToCheck, expectedInitialized);
+      }, "Check request values when initialized from Request and init values");
+
+      test(function() {
+        var url = "http://url.test:1234/path/subpath?query=true";
+        url += "#fragment";
+        expectedDefault["url"] = url;
+        var requestToCheck = new Request(url);
+        checkRequest(requestToCheck, expectedDefault);
+      }, "Check request values when initialized from url string");
+
+      test(function() {
+        var url = "http://url.test:1234/path/subpath?query=true";
+        url += "#fragment";
+        expectedInitialized["url"] = url;
+        var requestToCheck = new Request(url , initValuesDict);
+        checkRequest(requestToCheck, expectedInitialized);
+      }, "Check request values when initialized from url and init values");
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/fetch/api/request/request-init-priority.any.js b/test/wpt/tests/fetch/api/request/request-init-priority.any.js
new file mode 100644
index 00000000000..eb5073c8578
--- /dev/null
+++ b/test/wpt/tests/fetch/api/request/request-init-priority.any.js
@@ -0,0 +1,26 @@
+var priorities = ["high",
+                  "low",
+                  "auto"
+                 ];
+
+for (idx in priorities) {
+  test(() => {
+    new Request("", {priority: priorities[idx]});
+  }, "new Request() with a '"  + priorities[idx] + "' priority does not throw an error");
+}
+
+test(() => {
+  assert_throws_js(TypeError, () => {
+    new Request("", {priority: 'invalid'});
+  }, "a new Request() must throw a TypeError if RequestInit's priority is an invalid value");
+}, "new Request() throws a TypeError if any of RequestInit's members' values are invalid");
+
+for (idx in priorities) {
+  promise_test(function(t) {
+    return fetch('hello.txt', { priority: priorities[idx] });
+  }, "fetch() with a '"  + priorities[idx] + "' priority completes successfully");
+}
+
+promise_test(function(t) {
+  return promise_rejects_js(t, TypeError, fetch('hello.txt', { priority: 'invalid' }));
+}, "fetch() with an invalid priority returns a rejected promise with a TypeError");
diff --git a/test/wpt/tests/fetch/api/request/request-keepalive-quota.html b/test/wpt/tests/fetch/api/request/request-keepalive-quota.html
new file mode 100644
index 00000000000..548ab38d7e1
--- /dev/null
+++ b/test/wpt/tests/fetch/api/request/request-keepalive-quota.html
@@ -0,0 +1,97 @@
+<!doctype html>
+<html>
+    <head>
+        <meta charset="utf-8">
+        <title>Request Keepalive Quota Tests</title>
+        <meta name="timeout" content="long">
+        <meta name="help" href="https://fetch.spec.whatwg.org/#request">
+        <meta name="help" href="https://fetch.spec.whatwg.org/#body-mixin">
+        <meta name="author" title="Microsoft Edge" href="https://www.microsoft.com">
+        <meta name="variant" content="?include=fast">
+        <meta name="variant" content="?include=slow-1">
+        <meta name="variant" content="?include=slow-2">
+        <meta name="variant" content="?include=slow-3">
+        <script src="/resources/testharness.js"></script>
+        <script src="/resources/testharnessreport.js"></script>
+        <script src="/common/subset-tests-by-key.js"></script>
+    </head>
+    <body>
+        <script>
+            'use strict';
+
+            // We want to ensure that our keepalive requests hang slightly before completing so we can validate
+            // the effects of a rolling quota. To do this we will utilize trickle.py with a 1s delay. This should
+            // prevent any of the Fetch's from finishing in this window.
+            const trickleURL = '../resources/trickle.py?count=1&ms=';
+            const noDelay = 0;
+            const standardDelay = 1000;
+            function wait(ms) {
+                return new Promise(resolve => step_timeout(resolve, ms));
+            }
+
+            // We should expect 64KiB of rolling quota for any type of keep-alive request sent.
+            const expectedQuota = 65536;
+
+            function fetchKeepAliveRequest(delay, bodySize) {
+                // Create a body of the specified size that's filled with *'s
+                const body = '*'.repeat(bodySize);
+                return fetch(trickleURL + delay, {keepalive: true, body, method: 'POST'}).then(res => {
+                    return res.text();
+                }).then(() => {
+                    return wait(1);
+                });
+            }
+
+            // Test 1 Byte
+            subsetTestByKey("fast", promise_test, function(test) {
+                return fetchKeepAliveRequest(noDelay, 1 /* bodySize */);
+            }, 'A Keep-Alive fetch() with a small body should succeed.');
+
+            // Test Quota full limit
+            subsetTestByKey("fast", promise_test, function(test) {
+                return fetchKeepAliveRequest(noDelay, expectedQuota /* bodySize */);
+            }, 'A Keep-Alive fetch() with a body at the Quota Limit should succeed.');
+
+            // Test Quota + 1 Byte
+            subsetTestByKey("fast", promise_test, function(test) {
+                return promise_rejects_js(test, TypeError, fetchKeepAliveRequest(noDelay, expectedQuota + 1));
+            }, 'A Keep-Alive fetch() with a body over the Quota Limit should reject.');
+
+            // Test the Quota becomes available upon promise completion.
+            subsetTestByKey("slow-1", promise_test, function (test) {
+                // Fill our Quota then try to send a second fetch.
+                return fetchKeepAliveRequest(standardDelay, expectedQuota).then(() => {
+                    // Now validate that we can send another Keep-Alive fetch for the full size of the quota.
+                    return fetchKeepAliveRequest(noDelay, expectedQuota);
+                });
+            }, 'A Keep-Alive fetch() should return its allocated Quota upon promise resolution.');
+
+            // Ensure only the correct amount of Quota becomes available when a fetch completes.
+            subsetTestByKey("slow-2", promise_test, function(test) {
+                // Create a fetch that uses all but 1 Byte of the Quota and runs for 2x as long as the other requests.
+                const first = fetchKeepAliveRequest(standardDelay * 2, expectedQuota - 1);
+
+                // Now create a single Byte request that will complete quicker.
+                const second = fetchKeepAliveRequest(standardDelay, 1 /* bodySize */).then(() => {
+                    // We shouldn't be able to create a 2 Byte request right now as only 1 Byte should have freed up.
+                    return promise_rejects_js(test, TypeError, fetchKeepAliveRequest(noDelay, 2 /* bodySize */));
+                }).then(() => {
+                    // Now validate that we can send another Keep-Alive fetch for just 1 Byte.
+                    return fetchKeepAliveRequest(noDelay, 1 /* bodySize */);
+                });
+
+                return Promise.all([first, second]);
+            }, 'A Keep-Alive fetch() should return only its allocated Quota upon promise resolution.');
+
+            // Test rejecting a fetch() after the quota is used up.
+            subsetTestByKey("slow-3", promise_test, function (test) {
+                // Fill our Quota then try to send a second fetch.
+                const p = fetchKeepAliveRequest(standardDelay, expectedQuota);
+
+                const q = promise_rejects_js(test, TypeError, fetchKeepAliveRequest(noDelay, 1 /* bodySize */));
+                return Promise.all([p, q]);
+            }, 'A Keep-Alive fetch() should not be allowed if the Quota is used up.');
+
+        </script>
+    </body>
+</html>
diff --git a/test/wpt/tests/fetch/api/request/request-reset-attributes.https.html b/test/wpt/tests/fetch/api/request/request-reset-attributes.https.html
new file mode 100644
index 00000000000..7be3608d737
--- /dev/null
+++ b/test/wpt/tests/fetch/api/request/request-reset-attributes.https.html
@@ -0,0 +1,96 @@
+<!DOCTYPE html>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/common/get-host-info.sub.js"></script>
+<script src="/service-workers/service-worker/resources/test-helpers.sub.js"></script>
+<body>
+<script>
+const worker = 'resources/request-reset-attributes-worker.js';
+
+function wait(ms) {
+  return new Promise(resolve => step_timeout(resolve, ms));
+}
+
+promise_test(async (t) => {
+    const scope = 'resources/hello.txt?name=isReloadNavigation';
+    let frame;
+    let reg;
+
+    try {
+      reg = await service_worker_unregister_and_register(t, worker, scope);
+      await wait_for_state(t, reg.installing, 'activated');
+      frame = await with_iframe(scope);
+      assert_equals(frame.contentDocument.body.textContent,
+                    'old: false, new: false');
+      await new Promise((resolve) => {
+        frame.onload = resolve;
+        frame.contentWindow.location.reload();
+      });
+      assert_equals(frame.contentDocument.body.textContent,
+                    'old: true, new: false');
+    } finally {
+      if (frame) {
+        frame.remove();
+      }
+      if (reg) {
+        await reg.unregister();
+      }
+    }
+  }, 'Request.isReloadNavigation is reset with non-empty RequestInit');
+
+promise_test(async (t) => {
+    const scope = 'resources/hello.html?name=isHistoryNavigation';
+    let frame;
+    let reg;
+
+    try {
+      reg = await service_worker_unregister_and_register(t, worker, scope);
+      await wait_for_state(t, reg.installing, 'activated');
+      frame = await with_iframe(scope);
+      assert_equals(frame.contentDocument.body.textContent,
+                    'old: false, new: false');
+      // Use step_timeout(0) to ensure the history entry is created for Blink
+      // and WebKit. See https://bugs.webkit.org/show_bug.cgi?id=42861.
+      await wait(0);
+      await new Promise((resolve) => {
+        frame.onload = resolve;
+        frame.src = 'resources/hello.html?ignore';
+      });
+      await wait(0);
+      await new Promise((resolve) => {
+        frame.onload = resolve;
+        frame.contentWindow.history.go(-1);
+      });
+      assert_equals(frame.contentDocument.body.textContent,
+                    'old: true, new: false');
+    } finally {
+      if (frame) {
+        frame.remove();
+      }
+      if (reg) {
+        await reg.unregister();
+      }
+    }
+}, 'Request.isHistoryNavigation is reset with non-empty RequestInit');
+
+promise_test(async (t) => {
+    const scope = 'resources/hello.txt?name=mode';
+    let frame;
+    let reg;
+
+    try {
+      reg = await service_worker_unregister_and_register(t, worker, scope);
+      await wait_for_state(t, reg.installing, 'activated');
+      frame = await with_iframe(scope);
+      assert_equals(frame.contentDocument.body.textContent,
+                    'old: navigate, new: same-origin');
+    } finally {
+      if (frame) {
+        frame.remove();
+      }
+      if (reg) {
+        await reg.unregister();
+      }
+    }
+  }, 'Request.mode is reset with non-empty RequestInit when it\'s "navigate"');
+</script>
diff --git a/test/wpt/tests/fetch/api/request/request-structure.any.js b/test/wpt/tests/fetch/api/request/request-structure.any.js
index 3d55c70ac1e..5e785538555 100644
--- a/test/wpt/tests/fetch/api/request/request-structure.any.js
+++ b/test/wpt/tests/fetch/api/request/request-structure.any.js
@@ -26,7 +26,11 @@ var attributes = ["method",
                   "duplex",
                   //Request implements Body
                   "bodyUsed"
-                  ];
+                 ];
+var internalAttributes = ["priority",
+                          "internalpriority",
+                          "blocking"
+                         ];
 
 function isReadOnly(request, attributeToCheck) {
   var defaultValue = undefined;
@@ -131,3 +135,9 @@ for (var idx in attributes) {
     isReadOnly(request, attributes[idx]);
   }, "Check " + attributes[idx] + " attribute");
 }
+
+for (var idx in internalAttributes) {
+  test(function() {
+    assert_false(internalAttributes[idx] in request, "request does not expose " + internalAttributes[idx] + " attribute");
+  }, "Request does not expose " + internalAttributes[idx] + " attribute");
+}
\ No newline at end of file
diff --git a/test/wpt/tests/fetch/api/request/resources/cache.py b/test/wpt/tests/fetch/api/request/resources/cache.py
new file mode 100644
index 00000000000..ca0bd644b4f
--- /dev/null
+++ b/test/wpt/tests/fetch/api/request/resources/cache.py
@@ -0,0 +1,67 @@
+from wptserve.utils import isomorphic_decode
+
+def main(request, response):
+    token = request.GET.first(b"token", None)
+    if b"querystate" in request.GET:
+        from json import JSONEncoder
+        response.headers.set(b"Content-Type", b"text/plain")
+        return JSONEncoder().encode(request.server.stash.take(token))
+    content = request.GET.first(b"content", None)
+    tag = request.GET.first(b"tag", None)
+    date = request.GET.first(b"date", None)
+    expires = request.GET.first(b"expires", None)
+    vary = request.GET.first(b"vary", None)
+    cc = request.GET.first(b"cache_control", None)
+    redirect = request.GET.first(b"redirect", None)
+    inm = request.headers.get(b"If-None-Match", None)
+    ims = request.headers.get(b"If-Modified-Since", None)
+    pragma = request.headers.get(b"Pragma", None)
+    cache_control = request.headers.get(b"Cache-Control", None)
+    ignore = b"ignore" in request.GET
+
+    if tag:
+        tag = b'"%s"' % tag
+
+    server_state = request.server.stash.take(token)
+    if not server_state:
+        server_state = []
+    state = dict()
+    if not ignore:
+        if inm:
+            state[u"If-None-Match"] = isomorphic_decode(inm)
+        if ims:
+            state[u"If-Modified-Since"] = isomorphic_decode(ims)
+        if pragma:
+            state[u"Pragma"] = isomorphic_decode(pragma)
+        if cache_control:
+            state[u"Cache-Control"] = isomorphic_decode(cache_control)
+    server_state.append(state)
+    request.server.stash.put(token, server_state)
+
+    if tag:
+        response.headers.set(b"ETag", b'%s' % tag)
+    elif date:
+        response.headers.set(b"Last-Modified", date)
+    if expires:
+        response.headers.set(b"Expires", expires)
+    if vary:
+        response.headers.set(b"Vary", vary)
+    if cc:
+        response.headers.set(b"Cache-Control", cc)
+
+    # The only-if-cached redirect tests wants CORS to be okay, the other tests
+    # are all same-origin anyways and don't care.
+    response.headers.set(b"Access-Control-Allow-Origin", b"*")
+
+    if redirect:
+        response.headers.set(b"Location", redirect)
+        response.status = (302, b"Redirect")
+        return b""
+    elif ((inm is not None and inm == tag) or
+          (ims is not None and ims == date)):
+        response.status = (304, b"Not Modified")
+        return b""
+    else:
+        response.status = (200, b"OK")
+        response.headers.set(b"Content-Type", b"text/plain")
+        return content
diff --git a/test/wpt/tests/fetch/api/request/resources/hello.txt b/test/wpt/tests/fetch/api/request/resources/hello.txt
new file mode 100644
index 00000000000..ce013625030
--- /dev/null
+++ b/test/wpt/tests/fetch/api/request/resources/hello.txt
@@ -0,0 +1 @@
+hello
diff --git a/test/wpt/tests/fetch/api/request/resources/request-reset-attributes-worker.js b/test/wpt/tests/fetch/api/request/resources/request-reset-attributes-worker.js
new file mode 100644
index 00000000000..4b264ca2fec
--- /dev/null
+++ b/test/wpt/tests/fetch/api/request/resources/request-reset-attributes-worker.js
@@ -0,0 +1,19 @@
+self.addEventListener('fetch', (event) => {
+    const params = new URL(event.request.url).searchParams;
+    if (params.has('ignore')) {
+      return;
+    }
+    if (!params.has('name')) {
+      event.respondWith(Promise.reject(TypeError('No name is provided.')));
+      return;
+    }
+
+    const name = params.get('name');
+    const old_attribute = event.request[name];
+    // If any of |init|'s member is present...
+    const init = {cache: 'no-store'}
+    const new_attribute = (new Request(event.request, init))[name];
+
+    event.respondWith(
+      new Response(`old: ${old_attribute}, new: ${new_attribute}`));
+  });
diff --git a/test/wpt/tests/fetch/api/request/url-encoding.html b/test/wpt/tests/fetch/api/request/url-encoding.html
new file mode 100644
index 00000000000..31c1ed3920b
--- /dev/null
+++ b/test/wpt/tests/fetch/api/request/url-encoding.html
@@ -0,0 +1,25 @@
+<!doctype html>
+<meta charset=windows-1252>
+<title>Fetch: URL encoding</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script>
+const expectedURL = new URL("?%C3%9F", location.href).href;
+const expectedURL2 = new URL("?%EF%BF%BD", location.href).href;
+test(() => {
+  let r = new Request("?\u00DF");
+  assert_equals(r.url, expectedURL);
+
+  r = new Request("?\uD83D");
+  assert_equals(r.url, expectedURL2);
+}, "URL encoding and Request");
+
+promise_test(() => {
+  return fetch("?\u00DF").then(res => {
+    assert_equals(res.url, expectedURL);
+    return fetch("?\uD83D").then(res2 => {
+      assert_equals(res2.url, expectedURL2);
+    });
+  });
+}, "URL encoding and fetch()");
+</script>
diff --git a/test/wpt/tests/fetch/api/resources/authentication.py b/test/wpt/tests/fetch/api/resources/authentication.py
new file mode 100644
index 00000000000..8b6b00b0873
--- /dev/null
+++ b/test/wpt/tests/fetch/api/resources/authentication.py
@@ -0,0 +1,14 @@
+def main(request, response):
+    user = request.auth.username
+    password = request.auth.password
+
+    if user == b"user" and password == b"password":
+        return b"Authentication done"
+
+    realm = b"test"
+    if b"realm" in request.GET:
+        realm = request.GET.first(b"realm")
+
+    return ((401, b"Unauthorized"),
+            [(b"WWW-Authenticate", b'Basic realm="' + realm + b'"')],
+            b"Please login with credentials 'user' and 'password'")
diff --git a/test/wpt/tests/fetch/api/resources/bad-chunk-encoding.py b/test/wpt/tests/fetch/api/resources/bad-chunk-encoding.py
new file mode 100644
index 00000000000..94a77adead8
--- /dev/null
+++ b/test/wpt/tests/fetch/api/resources/bad-chunk-encoding.py
@@ -0,0 +1,13 @@
+import time
+
+def main(request, response):
+    delay = float(request.GET.first(b"ms", 1000)) / 1E3
+    count = int(request.GET.first(b"count", 50))
+    time.sleep(delay)
+    response.headers.set(b"Transfer-Encoding", b"chunked")
+    response.write_status_headers()
+    time.sleep(delay)
+    for i in range(count):
+        response.writer.write_content(b"a\r\nTEST_CHUNK\r\n")
+        time.sleep(delay)
+    response.writer.write_content(b"garbage")
diff --git a/test/wpt/tests/fetch/api/resources/basic.html b/test/wpt/tests/fetch/api/resources/basic.html
new file mode 100644
index 00000000000..e23afd4bf6a
--- /dev/null
+++ b/test/wpt/tests/fetch/api/resources/basic.html
@@ -0,0 +1,5 @@
+<!DOCTYPE html>
+<!--
+  Duplicating /common/blank.html to make service worker scoping simpler in
+  ../abort/serviceworker-intercepted.https.html
+-->
diff --git a/test/wpt/tests/fetch/api/resources/cache.py b/test/wpt/tests/fetch/api/resources/cache.py
new file mode 100644
index 00000000000..4de751e30bf
--- /dev/null
+++ b/test/wpt/tests/fetch/api/resources/cache.py
@@ -0,0 +1,18 @@
+ETAG = b'"123abc"'
+CONTENT_TYPE = b"text/plain"
+CONTENT = b"lorem ipsum dolor sit amet"
+
+
+def main(request, response):
+    # let caching kick in if possible (conditional GET)
+    etag = request.headers.get(b"If-None-Match", None)
+    if etag == ETAG:
+        response.headers.set(b"X-HTTP-STATUS", 304)
+        response.status = (304, b"Not Modified")
+        return b""
+
+    # cache miss, so respond with the actual content
+    response.status = (200, b"OK")
+    response.headers.set(b"ETag", ETAG)
+    response.headers.set(b"Content-Type", CONTENT_TYPE)
+    return CONTENT
diff --git a/test/wpt/tests/fetch/api/resources/clean-stash.py b/test/wpt/tests/fetch/api/resources/clean-stash.py
new file mode 100644
index 00000000000..ee8c69ac446
--- /dev/null
+++ b/test/wpt/tests/fetch/api/resources/clean-stash.py
@@ -0,0 +1,6 @@
+def main(request, response):
+    token = request.GET.first(b"token")
+    if request.server.stash.take(token) is not None:
+        return b"1"
+    else:
+        return b"0"
diff --git a/test/wpt/tests/fetch/api/resources/cors-top.txt.headers b/test/wpt/tests/fetch/api/resources/cors-top.txt.headers
new file mode 100644
index 00000000000..cb762eff806
--- /dev/null
+++ b/test/wpt/tests/fetch/api/resources/cors-top.txt.headers
@@ -0,0 +1 @@
+Access-Control-Allow-Origin: *
diff --git a/test/wpt/tests/fetch/api/resources/dump-authorization-header.py b/test/wpt/tests/fetch/api/resources/dump-authorization-header.py
new file mode 100644
index 00000000000..a651aeb4e8b
--- /dev/null
+++ b/test/wpt/tests/fetch/api/resources/dump-authorization-header.py
@@ -0,0 +1,14 @@
+def main(request, response):
+    headers = [(b"Content-Type", "text/html"),
+               (b"Cache-Control", b"no-cache")]
+
+    if b"Origin" in request.headers:
+        headers.append((b"Access-Control-Allow-Origin", request.headers.get(b"Origin", b"")))
+        headers.append((b"Access-Control-Allow-Credentials", b"true"))
+    else:
+        headers.append((b"Access-Control-Allow-Origin", b"*"))
+    headers.append((b"Access-Control-Allow-Headers", b'Authorization'))
+
+    if b"authorization" in request.headers:
+        return 200, headers, request.headers.get(b"Authorization")
+    return 200, headers, "none"
diff --git a/test/wpt/tests/fetch/api/resources/echo-content.h2.py b/test/wpt/tests/fetch/api/resources/echo-content.h2.py
new file mode 100644
index 00000000000..0be3ece4a5f
--- /dev/null
+++ b/test/wpt/tests/fetch/api/resources/echo-content.h2.py
@@ -0,0 +1,7 @@
+def handle_headers(frame, request, response):
+    response.status = 200
+    response.headers.update([('Content-Type', 'text/plain')])
+    response.write_status_headers()
+
+def handle_data(frame, request, response):
+    response.writer.write_data(frame.data)
diff --git a/test/wpt/tests/fetch/api/resources/echo-content.py b/test/wpt/tests/fetch/api/resources/echo-content.py
new file mode 100644
index 00000000000..5e137e15d7d
--- /dev/null
+++ b/test/wpt/tests/fetch/api/resources/echo-content.py
@@ -0,0 +1,12 @@
+from wptserve.utils import isomorphic_encode
+
+def main(request, response):
+
+    headers = [(b"X-Request-Method", isomorphic_encode(request.method)),
+               (b"X-Request-Content-Length", request.headers.get(b"Content-Length", b"NO")),
+               (b"X-Request-Content-Type", request.headers.get(b"Content-Type", b"NO")),
+               # Avoid any kind of content sniffing on the response.
+               (b"Content-Type", b"text/plain")]
+    content = request.body
+
+    return headers, content
diff --git a/test/wpt/tests/fetch/api/resources/infinite-slow-response.py b/test/wpt/tests/fetch/api/resources/infinite-slow-response.py
new file mode 100644
index 00000000000..a26cd8064c8
--- /dev/null
+++ b/test/wpt/tests/fetch/api/resources/infinite-slow-response.py
@@ -0,0 +1,35 @@
+import time
+
+
+def url_dir(request):
+    return u'/'.join(request.url_parts.path.split(u'/')[:-1]) + u'/'
+
+
+def stash_write(request, key, value):
+    """Write to the stash, overwriting any previous value"""
+    request.server.stash.take(key, url_dir(request))
+    request.server.stash.put(key, value, url_dir(request))
+
+
+def main(request, response):
+    stateKey = request.GET.first(b"stateKey", b"")
+    abortKey = request.GET.first(b"abortKey", b"")
+
+    if stateKey:
+        stash_write(request, stateKey, 'open')
+
+    response.headers.set(b"Content-type", b"text/plain")
+    response.write_status_headers()
+
+    # Writing an initial 2k so browsers realise it's there. *shrug*
+    response.writer.write(b"." * 2048)
+
+    while True:
+        if not response.writer.write(b"."):
+            break
+        if abortKey and request.server.stash.take(abortKey, url_dir(request)):
+            break
+        time.sleep(0.01)
+
+    if stateKey:
+        stash_write(request, stateKey, 'closed')
diff --git a/test/wpt/tests/fetch/api/resources/inspect-headers.py b/test/wpt/tests/fetch/api/resources/inspect-headers.py
new file mode 100644
index 00000000000..9ed566e607b
--- /dev/null
+++ b/test/wpt/tests/fetch/api/resources/inspect-headers.py
@@ -0,0 +1,24 @@
+def main(request, response):
+    headers = []
+    if b"headers" in request.GET:
+        checked_headers = request.GET.first(b"headers").split(b"|")
+        for header in checked_headers:
+            if header in request.headers:
+                headers.append((b"x-request-" + header, request.headers.get(header, b"")))
+
+    if b"cors" in request.GET:
+        if b"Origin" in request.headers:
+            headers.append((b"Access-Control-Allow-Origin", request.headers.get(b"Origin", b"")))
+        else:
+            headers.append((b"Access-Control-Allow-Origin", b"*"))
+        headers.append((b"Access-Control-Allow-Credentials", b"true"))
+        headers.append((b"Access-Control-Allow-Methods", b"GET, POST, HEAD"))
+        exposed_headers = [b"x-request-" + header for header in checked_headers]
+        headers.append((b"Access-Control-Expose-Headers", b", ".join(exposed_headers)))
+        if b"allow_headers" in request.GET:
+            headers.append((b"Access-Control-Allow-Headers", request.GET[b'allow_headers']))
+        else:
+            headers.append((b"Access-Control-Allow-Headers", b", ".join(request.headers)))
+
+    headers.append((b"content-type", b"text/plain"))
+    return headers, b""
diff --git a/test/wpt/tests/fetch/api/resources/keepalive-iframe.html b/test/wpt/tests/fetch/api/resources/keepalive-iframe.html
new file mode 100644
index 00000000000..47de0da7790
--- /dev/null
+++ b/test/wpt/tests/fetch/api/resources/keepalive-iframe.html
@@ -0,0 +1,25 @@
+<!doctype html>
+<html>
+<meta charset="utf-8">
+<script src="/common/utils.js"></script>
+<script src="/common/get-host-info.sub.js"></script>
+<script>
+const SEARCH_PARAMS = new URL(location.href).searchParams;
+const ORIGIN1 = SEARCH_PARAMS.get('origin1') || '';
+const ORIGIN2 = SEARCH_PARAMS.get('origin2') || '';
+const WITH_HEADERS = !!SEARCH_PARAMS.has('with-headers');
+const TOKEN = token();
+
+const url =
+    `${ORIGIN1}/fetch/api/resources/redirect.py?` +
+    `delay=500&` +
+    `allow_headers=foo&` +
+    `location=${ORIGIN2}/fetch/api/resources/stash-put.py?key=${TOKEN}%26value=on`;
+
+addEventListener('load', () => {
+  const headers = WITH_HEADERS ? {'foo': 'bar'} : undefined;
+  let p = fetch(url, {keepalive: true, headers});
+  window.parent.postMessage(TOKEN, '*');
+});
+</script>
+</html>
diff --git a/test/wpt/tests/fetch/api/resources/keepalive-window.html b/test/wpt/tests/fetch/api/resources/keepalive-window.html
new file mode 100644
index 00000000000..6ccf484644c
--- /dev/null
+++ b/test/wpt/tests/fetch/api/resources/keepalive-window.html
@@ -0,0 +1,34 @@
+<!doctype html>
+<html>
+<meta charset="utf-8">
+<script src="/common/utils.js"></script>
+<script src="/common/get-host-info.sub.js"></script>
+<script>
+const TOKEN = token();
+const {
+  HTTP_NOTSAMESITE_ORIGIN,
+  HTTP_REMOTE_ORIGIN,
+  HTTP_REMOTE_ORIGIN_WITH_DIFFERENT_PORT
+} = get_host_info();
+const REDIRECT_DESTINATION =
+  `${HTTP_REMOTE_ORIGIN_WITH_DIFFERENT_PORT}/fetch/api/resources/stash-put.py` +
+  `?key=${TOKEN}&value=on`;
+const URL =
+    `${HTTP_REMOTE_ORIGIN}/fetch/api/resources/redirect.py?` +
+    `delay=500&` +
+    `allow_headers=foo&` +
+    `location=${encodeURIComponent(REDIRECT_DESTINATION)}`;
+
+addEventListener('load', () => {
+  const iframe = document.createElement('iframe');
+  document.body.appendChild(iframe);
+  iframe.contentWindow.addEventListener('unload', () => {
+    iframe.contentWindow.fetch(URL, {keepalive: true, headers: {foo: 'bar'}});
+  });
+
+  window.opener.postMessage(TOKEN, '*');
+  // Do NOT remove `iframe` here. We want to check the case where the nested
+  // frame is implicitly closed by window closure.
+});
+</script>
+</html>
diff --git a/test/wpt/tests/fetch/api/resources/method.py b/test/wpt/tests/fetch/api/resources/method.py
new file mode 100644
index 00000000000..c1a111b4cdf
--- /dev/null
+++ b/test/wpt/tests/fetch/api/resources/method.py
@@ -0,0 +1,18 @@
+from wptserve.utils import isomorphic_encode
+
+def main(request, response):
+    headers = []
+    if b"cors" in request.GET:
+        headers.append((b"Access-Control-Allow-Origin", b"*"))
+        headers.append((b"Access-Control-Allow-Credentials", b"true"))
+        headers.append((b"Access-Control-Allow-Methods", b"GET, POST, PUT, FOO"))
+        headers.append((b"Access-Control-Allow-Headers", b"x-test, x-foo"))
+        headers.append((b"Access-Control-Expose-Headers", b"x-request-method"))
+
+    headers.append((b"x-request-method", isomorphic_encode(request.method)))
+    headers.append((b"x-request-content-type", request.headers.get(b"Content-Type", b"NO")))
+    headers.append((b"x-request-content-length", request.headers.get(b"Content-Length", b"NO")))
+    headers.append((b"x-request-content-encoding", request.headers.get(b"Content-Encoding", b"NO")))
+    headers.append((b"x-request-content-language", request.headers.get(b"Content-Language", b"NO")))
+    headers.append((b"x-request-content-location", request.headers.get(b"Content-Location", b"NO")))
+    return headers, request.body
diff --git a/test/wpt/tests/fetch/api/resources/preflight.py b/test/wpt/tests/fetch/api/resources/preflight.py
new file mode 100644
index 00000000000..f983ef95227
--- /dev/null
+++ b/test/wpt/tests/fetch/api/resources/preflight.py
@@ -0,0 +1,78 @@
+def main(request, response):
+    headers = [(b"Content-Type", b"text/plain")]
+    stashed_data = {b'control_request_headers': b"", b'preflight': b"0", b'preflight_referrer': b""}
+
+    token = None
+    if b"token" in request.GET:
+        token = request.GET.first(b"token")
+
+    if b"origin" in request.GET:
+        for origin in request.GET[b'origin'].split(b", "):
+            headers.append((b"Access-Control-Allow-Origin", origin))
+    else:
+        headers.append((b"Access-Control-Allow-Origin", b"*"))
+
+    if b"clear-stash" in request.GET:
+        if request.server.stash.take(token) is not None:
+            return headers, b"1"
+        else:
+            return headers, b"0"
+
+    if b"credentials" in request.GET:
+        headers.append((b"Access-Control-Allow-Credentials", b"true"))
+
+    if request.method == u"OPTIONS":
+        if not b"Access-Control-Request-Method" in request.headers:
+            response.set_error(400, u"No Access-Control-Request-Method header")
+            return b"ERROR: No access-control-request-method in preflight!"
+
+        if request.headers.get(b"Accept", b"") != b"*/*":
+            response.set_error(400, u"Request does not have 'Accept: */*' header")
+            return b"ERROR: Invalid access in preflight!"
+
+        if b"control_request_headers" in request.GET:
+            stashed_data[b'control_request_headers'] = request.headers.get(b"Access-Control-Request-Headers", None)
+
+        if b"max_age" in request.GET:
+            headers.append((b"Access-Control-Max-Age", request.GET[b'max_age']))
+
+        if b"allow_headers" in request.GET:
+            headers.append((b"Access-Control-Allow-Headers", request.GET[b'allow_headers']))
+
+        if b"allow_methods" in request.GET:
+            headers.append((b"Access-Control-Allow-Methods", request.GET[b'allow_methods']))
+
+        preflight_status = 200
+        if b"preflight_status" in request.GET:
+            preflight_status = int(request.GET.first(b"preflight_status"))
+
+        stashed_data[b'preflight'] = b"1"
+        stashed_data[b'preflight_referrer'] = request.headers.get(b"Referer", b"")
+        stashed_data[b'preflight_user_agent'] = request.headers.get(b"User-Agent", b"")
+        if token:
+            request.server.stash.put(token, stashed_data)
+
+        return preflight_status, headers, b""
+
+
+    if token:
+        data = request.server.stash.take(token)
+        if data:
+            stashed_data = data
+
+    if b"checkUserAgentHeaderInPreflight" in request.GET and request.headers.get(b"User-Agent") != stashed_data[b'preflight_user_agent']:
+        return 400, headers, b"ERROR: No user-agent header in preflight"
+
+    #use x-* headers for returning value to bodyless responses
+    headers.append((b"Access-Control-Expose-Headers", b"x-did-preflight, x-control-request-headers, x-referrer, x-preflight-referrer, x-origin"))
+    headers.append((b"x-did-preflight", stashed_data[b'preflight']))
+    if stashed_data[b'control_request_headers'] != None:
+        headers.append((b"x-control-request-headers", stashed_data[b'control_request_headers']))
+    headers.append((b"x-preflight-referrer", stashed_data[b'preflight_referrer']))
+    headers.append((b"x-referrer", request.headers.get(b"Referer", b"")))
+    headers.append((b"x-origin", request.headers.get(b"Origin", b"")))
+
+    if token:
+        request.server.stash.put(token, stashed_data)
+
+    return headers, b""
diff --git a/test/wpt/tests/fetch/api/resources/redirect-empty-location.py b/test/wpt/tests/fetch/api/resources/redirect-empty-location.py
new file mode 100644
index 00000000000..1a5f7feb2a4
--- /dev/null
+++ b/test/wpt/tests/fetch/api/resources/redirect-empty-location.py
@@ -0,0 +1,3 @@
+def main(request, response):
+    headers = [(b"Location", b"")]
+    return 302, headers, b""
diff --git a/test/wpt/tests/fetch/api/resources/redirect.h2.py b/test/wpt/tests/fetch/api/resources/redirect.h2.py
new file mode 100644
index 00000000000..69370145876
--- /dev/null
+++ b/test/wpt/tests/fetch/api/resources/redirect.h2.py
@@ -0,0 +1,14 @@
+from wptserve.utils import isomorphic_decode, isomorphic_encode
+
+def handle_headers(frame, request, response):
+    status = 302
+    if b'redirect_status' in request.GET:
+        status = int(request.GET[b'redirect_status'])
+    response.status = status
+
+    if b'location' in request.GET:
+      url = isomorphic_decode(request.GET[b'location'])
+      response.headers[b'Location'] = isomorphic_encode(url)
+
+    response.headers.update([('Content-Type', 'text/plain')])
+    response.write_status_headers()
diff --git a/test/wpt/tests/fetch/api/resources/redirect.py b/test/wpt/tests/fetch/api/resources/redirect.py
new file mode 100644
index 00000000000..d52ab5f3eee
--- /dev/null
+++ b/test/wpt/tests/fetch/api/resources/redirect.py
@@ -0,0 +1,73 @@
+import time
+
+from urllib.parse import urlencode, urlparse
+
+from wptserve.utils import isomorphic_decode, isomorphic_encode
+
+def main(request, response):
+    stashed_data = {b'count': 0, b'preflight': b"0"}
+    status = 302
+    headers = [(b"Content-Type", b"text/plain"),
+               (b"Cache-Control", b"no-cache"),
+               (b"Pragma", b"no-cache")]
+    if b"Origin" in request.headers:
+        headers.append((b"Access-Control-Allow-Origin", request.headers.get(b"Origin", b"")))
+        headers.append((b"Access-Control-Allow-Credentials", b"true"))
+    else:
+        headers.append((b"Access-Control-Allow-Origin", b"*"))
+
+    token = None
+    if b"token" in request.GET:
+        token = request.GET.first(b"token")
+        data = request.server.stash.take(token)
+        if data:
+            stashed_data = data
+
+    if request.method == u"OPTIONS":
+        if b"allow_headers" in request.GET:
+            headers.append((b"Access-Control-Allow-Headers", request.GET[b'allow_headers']))
+        stashed_data[b'preflight'] = b"1"
+        #Preflight is not redirected: return 200
+        if not b"redirect_preflight" in request.GET:
+            if token:
+                request.server.stash.put(request.GET.first(b"token"), stashed_data)
+            return 200, headers, u""
+
+    if b"redirect_status" in request.GET:
+        status = int(request.GET[b'redirect_status'])
+    elif b"redirect_status" in request.POST:
+        status = int(request.POST[b'redirect_status'])
+
+    stashed_data[b'count'] += 1
+
+    if b"location" in request.GET:
+        url = isomorphic_decode(request.GET[b'location'])
+        if b"simple" not in request.GET:
+            scheme = urlparse(url).scheme
+            if scheme == u"" or scheme == u"http" or scheme == u"https":
+                url += u"&" if u'?' in url else u"?"
+                #keep url parameters in location
+                url_parameters = {}
+                for item in request.GET.items():
+                    url_parameters[isomorphic_decode(item[0])] = isomorphic_decode(item[1][0])
+                url += urlencode(url_parameters)
+                #make sure location changes during redirection loop
+                url += u"&count=" + str(stashed_data[b'count'])
+        headers.append((b"Location", isomorphic_encode(url)))
+
+    if b"redirect_referrerpolicy" in request.GET:
+        headers.append((b"Referrer-Policy", request.GET[b'redirect_referrerpolicy']))
+
+    if b"delay" in request.GET:
+        time.sleep(float(request.GET.first(b"delay", 0)) / 1E3)
+
+    if token:
+        request.server.stash.put(request.GET.first(b"token"), stashed_data)
+        if b"max_count" in request.GET:
+            max_count = int(request.GET[b'max_count'])
+            #stop redirecting and return count
+            if stashed_data[b'count'] > max_count:
+                # -1 because the last is not a redirection
+                return str(stashed_data[b'count'] - 1)
+
+    return status, headers, u""
diff --git a/test/wpt/tests/fetch/api/resources/sandboxed-iframe.html b/test/wpt/tests/fetch/api/resources/sandboxed-iframe.html
new file mode 100644
index 00000000000..6e5d5065474
--- /dev/null
+++ b/test/wpt/tests/fetch/api/resources/sandboxed-iframe.html
@@ -0,0 +1,34 @@
+<!doctype html>
+<html>
+<script>
+async function no_cors_should_be_rejected() {
+  let thrown = false;
+  try {
+    const resp = await fetch('top.txt');
+  } catch (e) {
+    thrown = true;
+  }
+  if (!thrown) {
+    throw Error('fetching "top.txt" should be rejected.');
+  }
+}
+
+async function null_origin_should_be_accepted() {
+  const url = 'top.txt?pipe=header(access-control-allow-origin,null)|' +
+              'header(cache-control,no-store)';
+  const resp = await fetch(url);
+}
+
+async function test() {
+  try {
+    await no_cors_should_be_rejected();
+    await null_origin_should_be_accepted();
+    parent.postMessage('PASS', '*');
+  } catch (e) {
+    parent.postMessage(e.message, '*');
+  }
+}
+
+test();
+</script>
+</html>
diff --git a/test/wpt/tests/fetch/api/resources/script-with-header.py b/test/wpt/tests/fetch/api/resources/script-with-header.py
new file mode 100644
index 00000000000..9a9c70ef5cf
--- /dev/null
+++ b/test/wpt/tests/fetch/api/resources/script-with-header.py
@@ -0,0 +1,7 @@
+def main(request, response):
+    headers = [(b"Content-type", request.GET.first(b"mime"))]
+    if b"content" in request.GET and request.GET.first(b"content") == b"empty":
+        content = b''
+    else:
+        content = b"console.log('Script loaded')"
+    return 200, headers, content
diff --git a/test/wpt/tests/fetch/api/resources/stash-put.py b/test/wpt/tests/fetch/api/resources/stash-put.py
new file mode 100644
index 00000000000..dbc7ceebb88
--- /dev/null
+++ b/test/wpt/tests/fetch/api/resources/stash-put.py
@@ -0,0 +1,17 @@
+from wptserve.utils import isomorphic_decode
+
+def main(request, response):
+    if request.method == u'OPTIONS':
+        # CORS preflight
+        response.headers.set(b'Access-Control-Allow-Origin', b'*')
+        response.headers.set(b'Access-Control-Allow-Methods', b'*')
+        response.headers.set(b'Access-Control-Allow-Headers', b'*')
+        return 'done'
+
+    url_dir = u'/'.join(request.url_parts.path.split(u'/')[:-1]) + u'/'
+    key = request.GET.first(b"key")
+    value = request.GET.first(b"value")
+    # value here must be a text string. It will be json.dump()'ed in stash-take.py.
+    request.server.stash.put(key, isomorphic_decode(value), url_dir)
+    response.headers.set(b'Access-Control-Allow-Origin', b'*')
+    return "done"
diff --git a/test/wpt/tests/fetch/api/resources/stash-take.py b/test/wpt/tests/fetch/api/resources/stash-take.py
new file mode 100644
index 00000000000..e6db80dd86d
--- /dev/null
+++ b/test/wpt/tests/fetch/api/resources/stash-take.py
@@ -0,0 +1,9 @@
+from wptserve.handlers import json_handler
+
+
+@json_handler
+def main(request, response):
+    dir = u'/'.join(request.url_parts.path.split(u'/')[:-1]) + u'/'
+    key = request.GET.first(b"key")
+    response.headers.set(b'Access-Control-Allow-Origin', b'*')
+    return request.server.stash.take(key, dir)
diff --git a/test/wpt/tests/fetch/api/resources/status.py b/test/wpt/tests/fetch/api/resources/status.py
new file mode 100644
index 00000000000..05a59d5a637
--- /dev/null
+++ b/test/wpt/tests/fetch/api/resources/status.py
@@ -0,0 +1,11 @@
+from wptserve.utils import isomorphic_encode
+
+def main(request, response):
+    code = int(request.GET.first(b"code", 200))
+    text = request.GET.first(b"text", b"OMG")
+    content = request.GET.first(b"content", b"")
+    type = request.GET.first(b"type", b"")
+    status = (code, text)
+    headers = [(b"Content-Type", type),
+               (b"X-Request-Method", isomorphic_encode(request.method))]
+    return status, headers, content
diff --git a/test/wpt/tests/fetch/api/resources/sw-intercept-abort.js b/test/wpt/tests/fetch/api/resources/sw-intercept-abort.js
new file mode 100644
index 00000000000..19d4b189d85
--- /dev/null
+++ b/test/wpt/tests/fetch/api/resources/sw-intercept-abort.js
@@ -0,0 +1,19 @@
+async function messageClient(clientId, message) {
+  const client = await clients.get(clientId);
+  client.postMessage(message);
+}
+
+addEventListener('fetch', event => {
+  let resolve;
+  const promise = new Promise(r => resolve = r);
+
+  function onAborted() {
+     messageClient(event.clientId, event.request.signal.reason);
+     resolve();
+  }
+
+  messageClient(event.clientId, 'fetch event has arrived');
+
+  event.respondWith(promise.then(() => new Response('hello')));
+  event.request.signal.addEventListener('abort', onAborted);
+});
diff --git a/test/wpt/tests/fetch/api/resources/sw-intercept.js b/test/wpt/tests/fetch/api/resources/sw-intercept.js
new file mode 100644
index 00000000000..b8166b62a5c
--- /dev/null
+++ b/test/wpt/tests/fetch/api/resources/sw-intercept.js
@@ -0,0 +1,10 @@
+async function broadcast(msg) {
+  for (const client of await clients.matchAll()) {
+    client.postMessage(msg);
+  }
+}
+
+addEventListener('fetch', event => {
+  event.waitUntil(broadcast(event.request.url));
+  event.respondWith(fetch(event.request));
+});
diff --git a/test/wpt/tests/fetch/api/resources/trickle.py b/test/wpt/tests/fetch/api/resources/trickle.py
new file mode 100644
index 00000000000..99833f1b38d
--- /dev/null
+++ b/test/wpt/tests/fetch/api/resources/trickle.py
@@ -0,0 +1,15 @@
+import time
+
+def main(request, response):
+    delay = float(request.GET.first(b"ms", 500)) / 1E3
+    count = int(request.GET.first(b"count", 50))
+    # Read request body
+    request.body
+    time.sleep(delay)
+    if not b"notype" in request.GET:
+        response.headers.set(b"Content-type", b"text/plain")
+    response.write_status_headers()
+    time.sleep(delay)
+    for i in range(count):
+        response.writer.write_content(b"TEST_TRICKLE\n")
+        time.sleep(delay)
diff --git a/test/wpt/tests/fetch/api/resources/utils.js b/test/wpt/tests/fetch/api/resources/utils.js
index 662de799181..3b20ecc8346 100644
--- a/test/wpt/tests/fetch/api/resources/utils.js
+++ b/test/wpt/tests/fetch/api/resources/utils.js
@@ -57,7 +57,8 @@ function validateBufferFromString(buffer, expectedValue, message)
 }
 
 function validateStreamFromString(reader, expectedValue, retrievedArrayBuffer) {
-  return reader.read().then(function(data) {
+  // Passing Uint8Array for byte streams; non-byte streams will simply ignore it
+  return reader.read(new Uint8Array(64)).then(function(data) {
     if (!data.done) {
       assert_true(data.value instanceof Uint8Array, "Fetch ReadableStream chunks should be Uint8Array");
       var newBuffer;
@@ -75,7 +76,8 @@ function validateStreamFromString(reader, expectedValue, retrievedArrayBuffer) {
 }
 
 function validateStreamFromPartialString(reader, expectedValue, retrievedArrayBuffer) {
-  return reader.read().then(function(data) {
+  // Passing Uint8Array for byte streams; non-byte streams will simply ignore it
+  return reader.read(new Uint8Array(64)).then(function(data) {
     if (!data.done) {
       assert_true(data.value instanceof Uint8Array, "Fetch ReadableStream chunks should be Uint8Array");
       var newBuffer;
diff --git a/test/wpt/tests/fetch/api/response/multi-globals/current/current.html b/test/wpt/tests/fetch/api/response/multi-globals/current/current.html
new file mode 100644
index 00000000000..9bb6e0bbf3f
--- /dev/null
+++ b/test/wpt/tests/fetch/api/response/multi-globals/current/current.html
@@ -0,0 +1,3 @@
+<!DOCTYPE html>
+<title>Current page used as a test helper</title>
+<base href="success/">
diff --git a/test/wpt/tests/fetch/api/response/multi-globals/incumbent/incumbent.html b/test/wpt/tests/fetch/api/response/multi-globals/incumbent/incumbent.html
new file mode 100644
index 00000000000..f63372e64c2
--- /dev/null
+++ b/test/wpt/tests/fetch/api/response/multi-globals/incumbent/incumbent.html
@@ -0,0 +1,16 @@
+<!DOCTYPE html>
+<title>Incumbent page used as a test helper</title>
+
+<iframe src="../current/current.html" id="c"></iframe>
+<iframe src="../relevant/relevant.html" id="r"></iframe>
+
+<script>
+'use strict';
+
+window.createRedirectResponse = (...args) => {
+    const current = document.querySelector('#c').contentWindow;
+    const relevant = document.querySelector('#r').contentWindow;
+    return current.Response.redirect.call(relevant.Response, ...args);
+};
+
+</script>
diff --git a/test/wpt/tests/fetch/api/response/multi-globals/relevant/relevant.html b/test/wpt/tests/fetch/api/response/multi-globals/relevant/relevant.html
new file mode 100644
index 00000000000..44f42eda493
--- /dev/null
+++ b/test/wpt/tests/fetch/api/response/multi-globals/relevant/relevant.html
@@ -0,0 +1,2 @@
+<!DOCTYPE html>
+<title>Relevant page used as a test helper</title>
diff --git a/test/wpt/tests/fetch/api/response/multi-globals/url-parsing.html b/test/wpt/tests/fetch/api/response/multi-globals/url-parsing.html
new file mode 100644
index 00000000000..5f2f42a1cea
--- /dev/null
+++ b/test/wpt/tests/fetch/api/response/multi-globals/url-parsing.html
@@ -0,0 +1,27 @@
+<!DOCTYPE html>
+<title>Response.redirect URL parsing, with multiple globals in play</title>
+<link rel="help" href="https://fetch.spec.whatwg.org/#dom-response-redirect">
+<link rel="author" title="Domenic Denicola" href="mailto:d@domenic.me">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+
+<!-- This is the entry global -->
+
+<iframe src="incumbent/incumbent.html"></iframe>
+
+<script>
+'use strict';
+
+const loadPromise = new Promise(resolve => {
+    window.addEventListener("load", () => resolve());
+});
+
+promise_test(() => {
+    return loadPromise.then(() => {
+        const res = document.querySelector('iframe').contentWindow.createRedirectResponse("url");
+
+        assert_equals(res.headers.get("Location"), new URL("current/success/url", location.href).href);
+    });
+}, "should parse the redirect Location URL relative to the current settings object");
+
+</script>
diff --git a/test/wpt/tests/fetch/api/response/response-body-read-task-handling.html b/test/wpt/tests/fetch/api/response/response-body-read-task-handling.html
new file mode 100644
index 00000000000..c2c90eaa8bd
--- /dev/null
+++ b/test/wpt/tests/fetch/api/response/response-body-read-task-handling.html
@@ -0,0 +1,54 @@
+<!DOCTYPE html>
+<html>
+<head>
+  <meta charset="UTF-8">
+  <title></title>
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+</head>
+<body>
+  <script>
+function performMicrotaskCheckpoint() {
+    document.createNodeIterator(document, -1, {
+        acceptNode() {
+            return NodeFilter.FILTER_ACCEPT;
+        }
+    }).nextNode();
+}
+
+promise_test(function() {
+    return fetch("../resources/data.json").then(function(response) {
+        // Add a getter for "then" that will incidentally be invoked
+        // during promise resolution.
+        Object.prototype.__defineGetter__('then', () => {
+            // Clean up behind ourselves.
+            delete Object.prototype.then;
+
+            // This promise should (like all promises) be resolved
+            // asynchronously.
+            var executed = false;
+            Promise.resolve().then(_ => { executed = true; });
+
+            // This shouldn't run microtasks!  They should only run
+            // after the fetch is resolved.
+            performMicrotaskCheckpoint();
+
+            // The fulfill handler above shouldn't have run yet.  If it has run,
+            // throw to reject this promise and fail the test.
+            if (executed) {
+                throw "shouldn't have run microtasks yet";
+            }
+
+            // Otherwise act as if there's no "then" property so the promise
+            // fulfills and the test passes.
+            return undefined;
+        });
+
+        // Create a read request, incidentally resolving a promise with an
+        // object value, thereby invoking the getter installed above.
+        return response.body.getReader().read();
+    });
+}, "reading from a body stream should occur in a microtask scope");
+  </script>
+</body>
+</html>
diff --git a/test/wpt/tests/fetch/api/response/response-clone-iframe.window.js b/test/wpt/tests/fetch/api/response/response-clone-iframe.window.js
new file mode 100644
index 00000000000..da54616c376
--- /dev/null
+++ b/test/wpt/tests/fetch/api/response/response-clone-iframe.window.js
@@ -0,0 +1,32 @@
+// Verify that calling Response clone() in a detached iframe doesn't crash.
+// Regression test for https://crbug.com/1082688.
+
+'use strict';
+
+promise_test(async () => {
+  // Wait for the document body to be available.
+  await new Promise(resolve => {
+    onload = resolve;
+  });
+
+  window.iframe = document.createElement('iframe');
+  document.body.appendChild(iframe);
+  iframe.srcdoc = `<!doctype html>
+<script>
+const response = new Response('body');
+window.parent.postMessage('okay', '*');
+window.parent.iframe.remove();
+response.clone();
+</script>
+`;
+
+  await new Promise(resolve => {
+    onmessage = evt => {
+      if (evt.data === 'okay') {
+        resolve();
+      }
+    };
+  });
+
+  // If it got here without crashing, the test passed.
+}, 'clone within removed iframe should not crash');
diff --git a/test/wpt/tests/fetch/api/response/response-consume-stream.any.js b/test/wpt/tests/fetch/api/response/response-consume-stream.any.js
index d5b0c388cc7..befce620a3f 100644
--- a/test/wpt/tests/fetch/api/response/response-consume-stream.any.js
+++ b/test/wpt/tests/fetch/api/response/response-consume-stream.any.js
@@ -20,35 +20,37 @@ var blob = new Blob([textData], { "type" : "text/plain" });
 var urlSearchParamsData = "name=value";
 var urlSearchParams = new URLSearchParams(urlSearchParamsData);
 
-promise_test(function(test) {
-    var response = new Response(blob);
-    return validateStreamFromString(response.body.getReader(), textData);
-}, "Read blob response's body as readableStream");
-
-promise_test(function(test) {
-    var response = new Response(textData);
-    return validateStreamFromString(response.body.getReader(), textData);
-}, "Read text response's body as readableStream");
-
-promise_test(function(test) {
-    var response = new Response(urlSearchParams);
-    return validateStreamFromString(response.body.getReader(), urlSearchParamsData);
-}, "Read URLSearchParams response's body as readableStream");
-
-promise_test(function(test) {
-    var arrayBuffer = new ArrayBuffer(textData.length);
-    var int8Array = new Int8Array(arrayBuffer);
-    for (var cptr = 0; cptr < textData.length; cptr++)
-        int8Array[cptr] = textData.charCodeAt(cptr);
-
-    return validateStreamFromString(new Response(arrayBuffer).body.getReader(), textData);
-}, "Read array buffer response's body as readableStream");
-
-promise_test(function(test) {
-    var response = new Response(formData);
-    return validateStreamFromPartialString(response.body.getReader(),
-      "Content-Disposition: form-data; name=\"name\"\r\n\r\nvalue");
-}, "Read form data response's body as readableStream");
+for (const mode of [undefined, "byob"]) {
+    promise_test(function(test) {
+        var response = new Response(blob);
+        return validateStreamFromString(response.body.getReader({ mode }), textData);
+    }, `Read blob response's body as readableStream with mode=${mode}`);
+
+    promise_test(function(test) {
+        var response = new Response(textData);
+        return validateStreamFromString(response.body.getReader({ mode }), textData);
+    }, `Read text response's body as readableStream with mode=${mode}`);
+
+    promise_test(function(test) {
+        var response = new Response(urlSearchParams);
+        return validateStreamFromString(response.body.getReader({ mode }), urlSearchParamsData);
+    }, `Read URLSearchParams response's body as readableStream with mode=${mode}`);
+
+    promise_test(function(test) {
+        var arrayBuffer = new ArrayBuffer(textData.length);
+        var int8Array = new Int8Array(arrayBuffer);
+        for (var cptr = 0; cptr < textData.length; cptr++)
+            int8Array[cptr] = textData.charCodeAt(cptr);
+
+        return validateStreamFromString(new Response(arrayBuffer).body.getReader({ mode }), textData);
+    }, `Read array buffer response's body as readableStream with mode=${mode}`);
+
+    promise_test(function(test) {
+        var response = new Response(formData);
+        return validateStreamFromPartialString(response.body.getReader({ mode }),
+        "Content-Disposition: form-data; name=\"name\"\r\n\r\nvalue");
+    }, `Read form data response's body as readableStream with mode=${mode}`);
+}
 
 test(function() {
     assert_equals(Response.error().body, null);
diff --git a/test/wpt/tests/fetch/api/response/response-consume.html b/test/wpt/tests/fetch/api/response/response-consume.html
new file mode 100644
index 00000000000..89fc49fd3c2
--- /dev/null
+++ b/test/wpt/tests/fetch/api/response/response-consume.html
@@ -0,0 +1,317 @@
+<!doctype html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>Response consume</title>
+    <meta name="help" href="https://fetch.spec.whatwg.org/#response">
+    <meta name="help" href="https://fetch.spec.whatwg.org/#body-mixin">
+    <meta name="author" title="Canon Research France" href="https://www.crf.canon.fr">
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <script src="../resources/utils.js"></script>
+  </head>
+  <body>
+    <script>
+    function blobToFormDataResponse(name, blob) {
+      var formData = new FormData();
+      formData.append(name, blob);
+      return new Response(formData);
+    }
+
+    function readBlobAsArrayBuffer(blob) {
+      return new Promise(function(resolve, reject) {
+        var reader = new FileReader();
+        reader.onload = function(evt) {
+          resolve(reader.result);
+        };
+        reader.onerror = function(evt) {
+          reject("Blob's reader failed");
+        };
+        reader.readAsArrayBuffer(blob);
+      });
+    }
+
+    function blobToTypeViaFetch(blob) {
+      var url = URL.createObjectURL(blob);
+      return fetch(url).then(function(response) {
+        return response.headers.get('Content-Type');
+      });
+    }
+
+    function responsePromise(body, responseInit) {
+      return new Promise(function(resolve, reject) {
+        resolve(new Response(body, responseInit));
+      });
+    }
+
+    function responseStringToMultipartFormTextData(response, name, value) {
+        assert_true(response.headers.has("Content-Type"), "Response contains Content-Type header");
+        var boundaryMatches = response.headers.get("Content-Type").match(/;\s*boundary=("?)([^";\s]*)\1/);
+        assert_true(!!boundaryMatches, "Response contains boundary parameter");
+        return stringToMultipartFormTextData(boundaryMatches[2], name, value);
+    }
+
+    function streamResponsePromise(streamData, responseInit) {
+      return new Promise(function(resolve, reject) {
+        var stream = new ReadableStream({
+          start: function(controller) {
+            controller.enqueue(stringToArray(streamData));
+            controller.close();
+          }
+        });
+        resolve(new Response(stream, responseInit));
+      });
+    }
+
+    function stringToMultipartFormTextData(multipartBoundary, name, value) {
+      return ('--' + multipartBoundary + '\r\n' +
+              'Content-Disposition: form-data;name="' + name + '"\r\n' +
+              '\r\n' +
+              value + '\r\n' +
+              '--' + multipartBoundary + '--\r\n');
+    }
+
+    function checkBodyText(test, response, expectedBody) {
+      return response.text().then( function(bodyAsText) {
+        assert_equals(bodyAsText, expectedBody, "Retrieve and verify response's body");
+        assert_true(response.bodyUsed, "body as text: bodyUsed turned true");
+      });
+    }
+
+    function checkBodyBlob(test, response, expectedBody, expectedType) {
+      return response.blob().then(function(bodyAsBlob) {
+        assert_equals(bodyAsBlob.type, expectedType || "text/plain", "Blob body type should be computed from the response Content-Type");
+
+        var promise = blobToTypeViaFetch(bodyAsBlob).then(function(type) {
+          assert_equals(type, expectedType || "text/plain", 'Type via blob URL');
+          return new Promise( function (resolve, reject) {
+            var reader = new FileReader();
+            reader.onload = function(evt) {
+              resolve(reader.result)
+            };
+            reader.onerror = function () {
+              reject("Blob's reader failed");
+            };
+            reader.readAsText(bodyAsBlob);
+          });
+        });
+        return promise.then(function(body) {
+          assert_equals(body, expectedBody, "Retrieve and verify response's body");
+          assert_true(response.bodyUsed, "body as blob: bodyUsed turned true");
+        });
+      });
+    }
+
+    function checkBodyArrayBuffer(test, response, expectedBody) {
+      return response.arrayBuffer().then( function(bodyAsArrayBuffer) {
+        validateBufferFromString(bodyAsArrayBuffer, expectedBody, "Retrieve and verify response's body");
+        assert_true(response.bodyUsed, "body as arrayBuffer: bodyUsed turned true");
+      });
+    }
+
+    function checkBodyJSON(test, response, expectedBody) {
+      return response.json().then(function(bodyAsJSON) {
+        var strBody = JSON.stringify(bodyAsJSON)
+        assert_equals(strBody, expectedBody, "Retrieve and verify response's body");
+        assert_true(response.bodyUsed, "body as json: bodyUsed turned true");
+      });
+    }
+
+    function checkBodyFormDataMultipart(test, response, expectedBody) {
+      return response.formData().then(function(bodyAsFormData) {
+        assert_true(bodyAsFormData instanceof FormData, "Should receive a FormData");
+        var entryName = "name";
+        var strBody = responseStringToMultipartFormTextData(response, entryName, bodyAsFormData.get(entryName));
+        assert_equals(strBody, expectedBody, "Retrieve and verify response's body");
+        assert_true(response.bodyUsed, "body as formData: bodyUsed turned true");
+     });
+    }
+
+    function checkBodyFormDataUrlencoded(test, response, expectedBody) {
+      return response.formData().then(function(bodyAsFormData) {
+        assert_true(bodyAsFormData instanceof FormData, "Should receive a FormData");
+        var entryName = "name";
+        var strBody = entryName + "=" + bodyAsFormData.get(entryName);
+        assert_equals(strBody, expectedBody, "Retrieve and verify response's body");
+        assert_true(response.bodyUsed, "body as formData: bodyUsed turned true");
+     });
+    }
+
+    function checkBodyFormDataError(test, response, expectedBody) {
+      return promise_rejects_js(test, TypeError, response.formData()).then(function() {
+        assert_true(response.bodyUsed, "body as formData: bodyUsed turned true");
+      });
+    }
+
+    function checkResponseBody(responsePromise, expectedBody, checkFunction, bodyTypes) {
+      promise_test(function(test) {
+        return responsePromise.then(function(response) {
+          assert_false(response.bodyUsed, "bodyUsed is false at init");
+          return checkFunction(test, response, expectedBody);
+        });
+      }, "Consume response's body: " + bodyTypes);
+    }
+
+    var textData = JSON.stringify("This is response's body");
+    var textResponseInit = { "headers": [["Content-Type", "text/PLAIN"]] };
+    var blob = new Blob([textData], { "type": "application/octet-stream" });
+    var multipartBoundary = "boundary-" + Math.random();
+    var formData = new FormData();
+    var formTextResponseInit = { "headers": [["Content-Type", 'multipart/FORM-data; boundary="' + multipartBoundary + '"']] };
+    var formTextData = stringToMultipartFormTextData(multipartBoundary, "name", textData);
+    var formBlob = new Blob([formTextData]);
+    var urlSearchParamsData = "name=value";
+    var urlSearchParams = new URLSearchParams(urlSearchParamsData);
+    var urlSearchParamsType = "application/x-www-form-urlencoded;charset=UTF-8";
+    var urlSearchParamsResponseInit = { "headers": [["Content-Type", urlSearchParamsType]] };
+    var urlSearchParamsBlob = new Blob([urlSearchParamsData], { "type": urlSearchParamsType });
+    formData.append("name", textData);
+
+    // https://fetch.spec.whatwg.org/#concept-body-package-data
+    // "UTF-8 decoded without BOM" is used for formData(), either in
+    // "multipart/form-data" and "application/x-www-form-urlencoded" cases,
+    // so BOMs in the values should be kept.
+    // (The "application/x-www-form-urlencoded" cases are tested in
+    // url/urlencoded-parser.any.js)
+    var textDataWithBom = "\uFEFFquick\uFEFFfox\uFEFF";
+    var formTextDataWithBom = stringToMultipartFormTextData(multipartBoundary, "name", textDataWithBom);
+    var formTextDataWithBomExpectedForMultipartFormData = stringToMultipartFormTextData(multipartBoundary, "name", textDataWithBom);
+
+    checkResponseBody(responsePromise(textData, textResponseInit), textData, checkBodyText, "from text to text");
+    checkResponseBody(responsePromise(textData, textResponseInit), textData, checkBodyBlob, "from text to blob");
+    checkResponseBody(responsePromise(textData, textResponseInit), textData, checkBodyArrayBuffer, "from text to arrayBuffer");
+    checkResponseBody(responsePromise(textData, textResponseInit), textData, checkBodyJSON, "from text to json");
+    checkResponseBody(responsePromise(formTextData, formTextResponseInit), formTextData, checkBodyFormDataMultipart, "from text with correct multipart type to formData");
+    checkResponseBody(responsePromise(formTextDataWithBom, formTextResponseInit), formTextDataWithBomExpectedForMultipartFormData, checkBodyFormDataMultipart, "from text with correct multipart type to formData with BOM");
+    checkResponseBody(responsePromise(formTextData, textResponseInit), undefined, checkBodyFormDataError, "from text without correct multipart type to formData (error case)");
+    checkResponseBody(responsePromise(urlSearchParamsData, urlSearchParamsResponseInit), urlSearchParamsData, checkBodyFormDataUrlencoded, "from text with correct urlencoded type to formData");
+    checkResponseBody(responsePromise(urlSearchParamsData, textResponseInit), undefined, checkBodyFormDataError, "from text without correct urlencoded type to formData (error case)");
+
+    checkResponseBody(responsePromise(blob, textResponseInit), textData, checkBodyBlob, "from blob to blob");
+    checkResponseBody(responsePromise(blob), textData, checkBodyText, "from blob to text");
+    checkResponseBody(responsePromise(blob), textData, checkBodyArrayBuffer, "from blob to arrayBuffer");
+    checkResponseBody(responsePromise(blob), textData, checkBodyJSON, "from blob to json");
+    checkResponseBody(responsePromise(formBlob, formTextResponseInit), formTextData, checkBodyFormDataMultipart, "from blob with correct multipart type to formData");
+    checkResponseBody(responsePromise(formBlob, textResponseInit), undefined, checkBodyFormDataError, "from blob without correct multipart type to formData (error case)");
+    checkResponseBody(responsePromise(urlSearchParamsBlob, urlSearchParamsResponseInit), urlSearchParamsData, checkBodyFormDataUrlencoded, "from blob with correct urlencoded type to formData");
+    checkResponseBody(responsePromise(urlSearchParamsBlob, textResponseInit), undefined, checkBodyFormDataError, "from blob without correct urlencoded type to formData (error case)");
+
+    function checkFormDataResponseBody(responsePromise, expectedName, expectedValue, checkFunction, bodyTypes) {
+      promise_test(function(test) {
+        return responsePromise.then(function(response) {
+          assert_false(response.bodyUsed, "bodyUsed is false at init");
+          var expectedBody = responseStringToMultipartFormTextData(response, expectedName, expectedValue);
+          return Promise.resolve().then(function() {
+            if (checkFunction === checkBodyFormDataMultipart)
+              return expectedBody;
+            // Modify expectedBody to use the same spacing for
+            // Content-Disposition parameters as Response and FormData does.
+            var response2 = new Response(formData);
+            return response2.text().then(function(formDataAsText) {
+              var reName = /[ \t]*;[ \t]*name=/;
+              var nameMatches = formDataAsText.match(reName);
+              return expectedBody.replace(reName, nameMatches[0]);
+            });
+          }).then(function(expectedBody) {
+            return checkFunction(test, response, expectedBody);
+          });
+        });
+      }, "Consume response's body: " + bodyTypes);
+    }
+
+    checkFormDataResponseBody(responsePromise(formData), "name", textData, checkBodyFormDataMultipart, "from FormData to formData");
+    checkResponseBody(responsePromise(formData, textResponseInit), undefined, checkBodyFormDataError, "from FormData without correct type to formData (error case)");
+    checkFormDataResponseBody(responsePromise(formData), "name", textData, function(test, response, expectedBody) { return checkBodyBlob(test, response, expectedBody, response.headers.get('Content-Type').toLowerCase()); }, "from FormData to blob");
+    checkFormDataResponseBody(responsePromise(formData), "name", textData, checkBodyText, "from FormData to text");
+    checkFormDataResponseBody(responsePromise(formData), "name", textData, checkBodyArrayBuffer, "from FormData to arrayBuffer");
+
+    checkResponseBody(responsePromise(urlSearchParams), urlSearchParamsData, checkBodyFormDataUrlencoded, "from URLSearchParams to formData");
+    checkResponseBody(responsePromise(urlSearchParams, textResponseInit), urlSearchParamsData, checkBodyFormDataError, "from URLSearchParams without correct type to formData (error case)");
+    checkResponseBody(responsePromise(urlSearchParams), urlSearchParamsData, function(test, response, expectedBody) { return checkBodyBlob(test, response, expectedBody, "application/x-www-form-urlencoded;charset=utf-8"); }, "from URLSearchParams to blob");
+    checkResponseBody(responsePromise(urlSearchParams), urlSearchParamsData, checkBodyText, "from URLSearchParams to text");
+    checkResponseBody(responsePromise(urlSearchParams), urlSearchParamsData, checkBodyArrayBuffer, "from URLSearchParams to arrayBuffer");
+
+    checkResponseBody(streamResponsePromise(textData, textResponseInit), textData, checkBodyBlob, "from stream to blob");
+    checkResponseBody(streamResponsePromise(textData), textData, checkBodyText, "from stream to text");
+    checkResponseBody(streamResponsePromise(textData), textData, checkBodyArrayBuffer, "from stream to arrayBuffer");
+    checkResponseBody(streamResponsePromise(textData), textData, checkBodyJSON, "from stream to json");
+    checkResponseBody(streamResponsePromise(formTextData, formTextResponseInit), formTextData, checkBodyFormDataMultipart, "from stream with correct multipart type to formData");
+    checkResponseBody(streamResponsePromise(formTextData), formTextData, checkBodyFormDataError, "from stream without correct multipart type to formData (error case)");
+    checkResponseBody(streamResponsePromise(urlSearchParamsData, urlSearchParamsResponseInit), urlSearchParamsData, checkBodyFormDataUrlencoded, "from stream with correct urlencoded type to formData");
+    checkResponseBody(streamResponsePromise(urlSearchParamsData), urlSearchParamsData, checkBodyFormDataError, "from stream without correct urlencoded type to formData (error case)");
+
+    checkResponseBody(fetch("../resources/top.txt"), "top", checkBodyBlob, "from fetch to blob");
+    checkResponseBody(fetch("../resources/top.txt"), "top", checkBodyText, "from fetch to text");
+    checkResponseBody(fetch("../resources/top.txt"), "top", checkBodyArrayBuffer, "from fetch to arrayBuffer");
+    checkResponseBody(fetch("../resources/top.txt"), "top", checkBodyFormDataError, "from fetch without correct type to formData (error case)");
+
+    promise_test(function(test) {
+      var response = new Response(new Blob([
+        "--boundary\r\n",
+        "Content-Disposition: form-data; name=string\r\n",
+        "\r\nvalue", new Uint8Array([0xC2, 0xA0]), "1\r\n",
+        "--boundary\r\n",
+        "Content-Disposition: form-data; name=string-with-default-charset\r\n",
+        "Content-Type: text/plain; charset=utf-8\r\n",
+        "\r\nvalue", new Uint8Array([0xC2, 0xA0]), "2\r\n",
+        "--boundary\r\n",
+        "Content-Disposition: form-data; name=string-with-non-default-charset\r\n",
+        "Content-Type: text/plain; charset=iso-8859-1\r\n",
+        "\r\nvalue", new Uint8Array([0xC2, 0xA0]), "3\r\n",
+        "--boundary\r\n",
+        "Content-Disposition: form-data; name=string-with-non-default-type\r\n",
+        "Content-Type: application/octet-stream\r\n",
+        "\r\nvalue", new Uint8Array([0xC2, 0xA0]), "4\r\n",
+        "--boundary\r\n",
+        "Content-Disposition: form-data; name=file; filename=file1\r\n",
+        "Content-Type: application/octet-stream; x-param=x-value\r\n",
+        "\r\n", new Uint8Array([5, 0x0, 0xFF]), "\r\n",
+        "--boundary\r\n",
+        "Content-Disposition: form-data; name=\"file-without-type\"; filename=\"file2\"\r\n",
+        "\r\n", new Uint8Array([6, 0x0, 0x7F, 0xFF]), "\r\n",
+        "--boundary--\r\n"
+      ]), { "headers": [["Content-Type", 'multipart/form-data; boundary="boundary"']] });
+      return response.formData().then(function(bodyAsFormData) {
+        // Non-file parts must always be decoded using utf-8 encoding.
+        assert_equals(bodyAsFormData.get("string"), "value\u00A01", "Retrieve and verify response's 1st entry value");
+        assert_equals(bodyAsFormData.get("string-with-default-charset"), "value\u00A02", "Retrieve and verify response's 2nd entry value");
+        assert_equals(bodyAsFormData.get("string-with-non-default-charset"), "value\u00A03", "Retrieve and verify response's 3rd entry value");
+        assert_equals(bodyAsFormData.get("string-with-non-default-type"), "value\u00A04", "Retrieve and verify response's 4th entry value");
+        // The name of a File must be taken from the filename parameter in
+        // the Content-Disposition header field.
+        assert_equals(bodyAsFormData.get("file").name, "file1", "Retrieve and verify response's 5th entry name property");
+        assert_equals(bodyAsFormData.get("file-without-type").name, "file2", "Retrieve and verify response's 6th entry name property");
+        // The type of a File must be taken from the Content-Type header field
+        // which defaults to "text/plain".
+        assert_equals(bodyAsFormData.get("file").type, "application/octet-stream; x-param=x-value", "Retrieve and verify response's 5th entry type property");
+        assert_equals(bodyAsFormData.get("file-without-type").type, "text/plain", "Retrieve and verify response's 6th entry type property");
+
+        return Promise.resolve().then(function() {
+          return blobToFormDataResponse("file", bodyAsFormData.get("file")).text().then(function(bodyAsText) {
+            // Verify that filename, name and type are preserved.
+            assert_regexp_match(bodyAsText, /\r\nContent-Disposition: *form-data;([^\r\n]*;)* *filename=("?)file1\2[;\r]/i, "Retrieve and verify response's 5th entry filename parameter");
+            assert_regexp_match(bodyAsText, /\r\nContent-Disposition: *form-data;([^\r\n]*;)* *name=("?)file\2[;\r]/i, "Retrieve and verify response's 5th entry name parameter");
+            assert_regexp_match(bodyAsText, /\r\nContent-Type: *application\/octet-stream; x-param=x-value\r\n/i, "Retrieve and verify response's 5th entry type field");
+            // Verify that the content is preserved.
+            return readBlobAsArrayBuffer(bodyAsFormData.get("file")).then(function(arrayBuffer) {
+              assert_array_equals(new Uint8Array(arrayBuffer), new Uint8Array([5, 0x0, 0xFF]), "Retrieve and verify response's 5th entry content");
+            });
+          });
+        }).then(function() {
+          return blobToFormDataResponse("file-without-type", bodyAsFormData.get("file-without-type")).text().then(function(bodyAsText) {
+            // Verify that filename, name and type are preserved.
+            assert_regexp_match(bodyAsText, /\r\nContent-Disposition: *form-data;([^\r\n]*;)* *filename=("?)file2\2[;\r]/i, "Retrieve and verify response's 6th entry filename parameter");
+            assert_regexp_match(bodyAsText, /\r\nContent-Disposition: *form-data;([^\r\n]*;)* *name=("?)file-without-type\2[;\r]/i, "Retrieve and verify response's 6th entry name parameter");
+            assert_regexp_match(bodyAsText, /\r\nContent-Type: *text\/plain\r\n/i, "Retrieve and verify response's 6th entry type field");
+            // Verify that the content is preserved.
+            return readBlobAsArrayBuffer(bodyAsFormData.get("file-without-type")).then(function(arrayBuffer) {
+              assert_array_equals(new Uint8Array(arrayBuffer), new Uint8Array([6, 0x0, 0x7F, 0xFF]), "Retrieve and verify response's 6th entry content");
+            });
+          });
+        });
+      });
+    }, "Consume response's body: from multipart form data blob to formData");
+
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/fetch/api/response/response-stream-with-broken-then.any.js b/test/wpt/tests/fetch/api/response/response-stream-with-broken-then.any.js
new file mode 100644
index 00000000000..8fef66c8a28
--- /dev/null
+++ b/test/wpt/tests/fetch/api/response/response-stream-with-broken-then.any.js
@@ -0,0 +1,117 @@
+// META: global=window,worker
+// META: script=../resources/utils.js
+
+promise_test(async () => {
+  // t.add_cleanup doesn't work when Object.prototype.then is overwritten, so
+  // these tests use add_completion_callback for cleanup instead.
+  add_completion_callback(() => delete Object.prototype.then);
+  const hello = new TextEncoder().encode('hello');
+  const bye = new TextEncoder().encode('bye');
+  const rs = new ReadableStream({
+    start(controller) {
+      controller.enqueue(hello);
+      controller.close();
+    }
+  });
+  const resp = new Response(rs);
+  Object.prototype.then = (onFulfilled) => {
+    delete Object.prototype.then;
+    onFulfilled({done: false, value: bye});
+  };
+  const text = await resp.text();
+  delete Object.prototype.then;
+  assert_equals(text, 'hello', 'The value should be "hello".');
+}, 'Attempt to inject {done: false, value: bye} via Object.prototype.then.');
+
+promise_test(async (t) => {
+  add_completion_callback(() => delete Object.prototype.then);
+  const hello = new TextEncoder().encode('hello');
+  const rs = new ReadableStream({
+    start(controller) {
+      controller.enqueue(hello);
+      controller.close();
+    }
+  });
+  const resp = new Response(rs);
+  Object.prototype.then = (onFulfilled) => {
+    delete Object.prototype.then;
+    onFulfilled({done: false, value: undefined});
+  };
+  const text = await resp.text();
+  delete Object.prototype.then;
+  assert_equals(text, 'hello', 'The value should be "hello".');
+}, 'Attempt to inject value: undefined via Object.prototype.then.');
+
+promise_test(async (t) => {
+  add_completion_callback(() => delete Object.prototype.then);
+  const hello = new TextEncoder().encode('hello');
+  const rs = new ReadableStream({
+    start(controller) {
+      controller.enqueue(hello);
+      controller.close();
+    }
+  });
+  const resp = new Response(rs);
+  Object.prototype.then = (onFulfilled) => {
+    delete Object.prototype.then;
+    onFulfilled(undefined);
+  };
+  const text = await resp.text();
+  delete Object.prototype.then;
+  assert_equals(text, 'hello', 'The value should be "hello".');
+}, 'Attempt to inject undefined via Object.prototype.then.');
+
+promise_test(async (t) => {
+  add_completion_callback(() => delete Object.prototype.then);
+  const hello = new TextEncoder().encode('hello');
+  const rs = new ReadableStream({
+    start(controller) {
+      controller.enqueue(hello);
+      controller.close();
+    }
+  });
+  const resp = new Response(rs);
+  Object.prototype.then = (onFulfilled) => {
+    delete Object.prototype.then;
+    onFulfilled(8.2);
+  };
+  const text = await resp.text();
+  delete Object.prototype.then;
+  assert_equals(text, 'hello', 'The value should be "hello".');
+}, 'Attempt to inject 8.2 via Object.prototype.then.');
+
+promise_test(async () => {
+  add_completion_callback(() => delete Object.prototype.then);
+  const hello = new TextEncoder().encode('hello');
+  const bye = new TextEncoder().encode('bye');
+  const resp = new Response(hello);
+  Object.prototype.then = (onFulfilled) => {
+    delete Object.prototype.then;
+    onFulfilled({done: false, value: bye});
+  };
+  const text = await resp.text();
+  delete Object.prototype.then;
+  assert_equals(text, 'hello', 'The value should be "hello".');
+}, 'intercepting arraybuffer to text conversion via Object.prototype.then ' +
+   'should not be possible');
+
+promise_test(async () => {
+  add_completion_callback(() => delete Object.prototype.then);
+  const u8a123 = new Uint8Array([1, 2, 3]);
+  const u8a456 = new Uint8Array([4, 5, 6]);
+  const resp = new Response(u8a123);
+  const writtenBytes = [];
+  const ws = new WritableStream({
+    write(chunk) {
+      writtenBytes.push(...Array.from(chunk));
+    }
+  });
+  Object.prototype.then = (onFulfilled) => {
+    delete Object.prototype.then;
+    onFulfilled({done: false, value: u8a456});
+  };
+  await resp.body.pipeTo(ws);
+  delete Object.prototype.then;
+  assert_array_equals(writtenBytes, u8a123, 'The value should be [1, 2, 3]');
+}, 'intercepting arraybuffer to body readable stream conversion via ' +
+   'Object.prototype.then should not be possible');
diff --git a/test/wpt/tests/fetch/connection-pool/network-partition-key.html b/test/wpt/tests/fetch/connection-pool/network-partition-key.html
new file mode 100644
index 00000000000..60a784cd84e
--- /dev/null
+++ b/test/wpt/tests/fetch/connection-pool/network-partition-key.html
@@ -0,0 +1,264 @@
+<!doctype html>
+<html>
+<head>
+  <meta charset="utf-8">
+  <title>Connection partitioning by site</title>
+  <meta name="help" href="https://fetch.spec.whatwg.org/#network-partition-keys">
+  <meta name="timeout" content="long">
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  <script src="/common/utils.js"></script>
+  <script src="/common/get-host-info.sub.js"></script>
+</head>
+<body>
+<!-- Used to open about:blank tabs from opaque origins -->
+<iframe id="iframe0" sandbox="allow-popups allow-scripts allow-popups-to-escape-sandbox"></iframe>
+<iframe id="iframe1" sandbox="allow-popups allow-scripts allow-popups-to-escape-sandbox"></iframe>
+<script>
+const host = get_host_info();
+
+// These two origins must correspond to different sites for this test to pass.
+const POPUP_ORIGINS = [
+  host.ORIGIN,
+  host.HTTP_NOTSAMESITE_ORIGIN
+];
+
+// This origin should ideally correspond to a different site from the two above, but the
+// tests will still pass if it matches the site of one of the other two origins.
+const OTHER_ORIGIN = host.REMOTE_ORIGIN;
+
+// Except for the csp_sandbox and about:blanks, each test opens up two windows, one at
+// POPUP_ORIGINS[0], one at POPUP_ORIGINS[1], and has them request subresources from
+// subresource_origin. All requests (HTML, JS, and fetch requests) for each window go
+// through network-partition-key.py and have a partition_id parameter, which is used
+// to check if any request for one window uses the same socket as a request for the
+// other window.
+//
+// Whenever requests from the two different popup windows use the same connection, the
+// fetch requests all start returning 400 errors, but other requests will continue to
+// succeed, to make for clearer errors.
+//
+// include_credentials indicates whether the fetch requests use credentials or not,
+// which is interesting as uncredentialed sockets have separate connection pools.
+const tests = [
+  {
+    name: 'With credentials',
+    subresource_origin: POPUP_ORIGINS[0],
+    include_credentials: true,
+    popup_params: [
+      {type: 'main_frame'},
+      {type: 'main_frame'}
+    ]
+  },
+  {
+    name: 'Without credentials',
+    subresource_origin: POPUP_ORIGINS[0],
+    include_credentials: false,
+    popup_params: [
+      {type: 'main_frame'},
+      {type: 'main_frame'}
+    ]
+  },
+  {
+    name: 'Cross-site resources with credentials',
+    subresource_origin: OTHER_ORIGIN,
+    include_credentials: true,
+    popup_params: [
+      {type: 'main_frame'},
+      {type: 'main_frame'}
+    ]
+  },
+  {
+    name: 'Cross-site resources without credentials',
+    subresource_origin: OTHER_ORIGIN,
+    include_credentials: false,
+    popup_params: [
+      {type: 'main_frame'},
+      {type: 'main_frame'}
+    ]
+  },
+  {
+    name: 'Iframes',
+    subresource_origin: OTHER_ORIGIN,
+    include_credentials: true,
+    popup_params: [
+      {
+        type: 'iframe',
+        iframe_origin: OTHER_ORIGIN
+      },
+      {
+        type: 'iframe',
+        iframe_origin: OTHER_ORIGIN
+      }
+    ]
+  },
+  {
+    name: 'Workers',
+    subresource_origin: POPUP_ORIGINS[0],
+    include_credentials: true,
+    popup_params: [
+      {type: 'worker'},
+      {type: 'worker'}
+    ]
+  },
+  {
+    name: 'Workers with cross-site resources',
+    subresource_origin: OTHER_ORIGIN,
+    include_credentials: true,
+    popup_params: [
+      {type: 'worker'},
+      {type: 'worker'}
+    ]
+  },
+  {
+    name: 'CSP sandbox',
+    subresource_origin: POPUP_ORIGINS[0],
+    include_credentials: true,
+    popup_params: [
+      {type: 'csp_sandbox'},
+      {type: 'csp_sandbox'}
+    ]
+  },
+  {
+    name: 'about:blank from opaque origin iframe',
+    subresource_origin: OTHER_ORIGIN,
+    include_credentials: true,
+    popup_params: [
+      {type: 'opaque_about_blank'},
+      {type: 'opaque_about_blank'}
+    ]
+  },
+];
+
+const BASE_PATH = window.location.pathname.replace(/\/[^\/]*$/, '/');
+
+function create_script_url(origin, uuid, partition_id, dispatch) {
+  return `${origin}${BASE_PATH}resources/network-partition-key.py?uuid=${uuid}&partition_id=${partition_id}&dispatch=${dispatch}`
+}
+
+function run_test(test) {
+  var uuid = token();
+
+  // Used to track the opened popup windows, so they can be closed at the end of the test.
+  // They could be closed immediately after use, but safest to keep them open, as browsers
+  // could use closing a window as a hint to close idle sockets that the window used.
+  var popup_windows = [];
+
+  // Creates a popup window at |url| and waits for a test result. Returns a promise.
+  function create_popup_and_wait_for_result(url) {
+    return new Promise(function(resolve, reject) {
+      popup_windows.push(window.open(url));
+      // Listen for the result
+      function message_listener(event) {
+        if (event.data.result === 'success') {
+          resolve();
+        } else if (event.data.result === 'error') {
+          reject(event.data.details);
+        } else {
+          reject('Unexpected message.');
+        }
+      }
+      window.addEventListener('message', message_listener, {once: 'true'});
+    });
+  }
+
+  // Navigates iframe to url and waits for a test result. Returns a promise.
+  function navigate_iframe_and_wait_for_result(iframe, url) {
+    return new Promise(function(resolve, reject) {
+      iframe.src = url;
+      // Listen for the result
+      function message_listener(event) {
+        if (event.data.result === 'success') {
+          resolve();
+        } else if (event.data.result === 'error') {
+          reject(event.data.details);
+        } else {
+          reject('Unexpected message.');
+        }
+      }
+      window.addEventListener('message', message_listener, {once: 'true'});
+    });
+  }
+
+  function make_test_function(test, index) {
+    var popup_params = test.popup_params[index];
+    return function() {
+      var popup_path;
+      var additional_url_params = '';
+      var origin = POPUP_ORIGINS[index];
+      var partition_id = POPUP_ORIGINS[index];
+      if (popup_params.type == 'main_frame') {
+        popup_path = 'resources/network-partition-checker.html';
+      } else if (popup_params.type == 'iframe') {
+        popup_path = 'resources/network-partition-iframe-checker.html';
+        additional_url_params = `&other_origin=${popup_params.iframe_origin}`;
+      } else if (popup_params.type == 'worker') {
+        popup_path = 'resources/network-partition-worker-checker.html';
+        // The origin of the dedicated worker must mutch the page that loads it.
+        additional_url_params = `&other_origin=${POPUP_ORIGINS[index]}`;
+      } else if (popup_params.type == 'csp_sandbox') {
+        // For the Content-Security-Policy sandbox test, all requests are from the same origin, but
+        // the origin should be treated as an opaque origin, so sockets should not be reused.
+        origin = test.subresource_origin;
+        partition_id = index;
+        popup_path = 'resources/network-partition-checker.html';
+        // Don't check partition of root document, since the document isn't sandboxed until the
+        // root document is fetched.
+        additional_url_params = '&sandbox=true&nocheck_partition=true'
+      } else if (popup_params.type=='opaque_about_blank') {
+        popup_path = 'resources/network-partition-about-blank-checker.html';
+      } else if (popup_params.type == 'iframe') {
+        throw 'Unrecognized popup_params.type.';
+      }
+      var url = create_script_url(origin, uuid, partition_id, 'fetch_file');
+      url += `&subresource_origin=${test.subresource_origin}`
+      url += `&include_credentials=${test.include_credentials}`
+      url += `&path=${BASE_PATH.substring(1)}${popup_path}`;
+      url += additional_url_params;
+
+      if (popup_params.type=='opaque_about_blank') {
+        return navigate_iframe_and_wait_for_result(iframe = document.getElementById('iframe' + index), url);
+      }
+
+      return create_popup_and_wait_for_result(url);
+    }
+  }
+
+  // Takes a Promise, and cleans up state when the promise has completed, successfully or not, re-throwing
+  // any exception from the passed in Promise.
+  async function clean_up_when_done(promise) {
+    var error;
+    try {
+      await promise;
+    } catch (e) {
+      error = e;
+    }
+
+    popup_windows.map(function (win) { win.close(); });
+
+    try {
+      var cleanup_url = create_script_url(host.ORIGIN, uuid, host.ORIGIN, 'clean_up');
+      var response = await fetch(cleanup_url, {credentials: 'omit', mode: 'cors'});
+      assert_equals(await response.text(), 'cleanup complete', `Sever state cleanup failed`);
+    } catch (e) {
+      // Prefer error from the passed in Promise over errors from the fetch request to clean up server state.
+      error = error || e;
+    }
+    if (error)
+      throw error;
+  }
+
+  return clean_up_when_done(
+      make_test_function(test, 0)()
+      .then(make_test_function(test, 1)));
+}
+
+tests.forEach(function (test) {
+  promise_test(
+      function() { return run_test(test); },
+      test.name);
+})
+
+</script>
+</body>
+</html>
diff --git a/test/wpt/tests/fetch/connection-pool/resources/network-partition-about-blank-checker.html b/test/wpt/tests/fetch/connection-pool/resources/network-partition-about-blank-checker.html
new file mode 100644
index 00000000000..7a8b6132375
--- /dev/null
+++ b/test/wpt/tests/fetch/connection-pool/resources/network-partition-about-blank-checker.html
@@ -0,0 +1,35 @@
+<!doctype html>
+<html>
+<head>
+  <meta charset="utf-8">
+  <title>about:blank Network Partition Checker</title>
+  <meta name="help" href="https://fetch.spec.whatwg.org/#network-partition-keys">
+  <meta name="timeout" content="normal">
+</head>
+<body>
+<script>
+  async function fetch_and_reply() {
+    // Load about:blank in a new tab, and inject the network partition checking code into it.
+    var win;
+    try {
+      win = window.open();
+      var url = 'SUBRESOURCE_PREFIX:&dispatch=fetch_file&path=fetch/connection-pool/resources/network-partition-checker.html&sandbox=true';
+      var response = await fetch(url, {credentials: 'omit', mode: 'cors'});
+      win.document.write(await response.text());
+    } catch (e) {
+      win.close();
+      window.parent.postMessage({result: 'error', details: e.message}, '*');
+      return;
+    }
+
+    // Listen for first message from the new window and pass it back to the parent.
+    function message_listener(event) {
+      window.parent.postMessage(event.data, '*');
+      win.close();
+    }
+    window.addEventListener('message', message_listener, {once: true});
+  }
+  fetch_and_reply();
+</script>
+</body>
+</html>
diff --git a/test/wpt/tests/fetch/connection-pool/resources/network-partition-checker.html b/test/wpt/tests/fetch/connection-pool/resources/network-partition-checker.html
new file mode 100644
index 00000000000..b058f611242
--- /dev/null
+++ b/test/wpt/tests/fetch/connection-pool/resources/network-partition-checker.html
@@ -0,0 +1,30 @@
+<!doctype html>
+<html>
+<head>
+  <meta charset="utf-8">
+  <title>Network Partition Checker</title>
+  <meta name="help" href="https://fetch.spec.whatwg.org/#network-partition-keys">
+  <meta name="timeout" content="normal">
+  <script src="SUBRESOURCE_PREFIX:&dispatch=fetch_file&path=common/utils.js"></script>
+  <script src="SUBRESOURCE_PREFIX:&dispatch=fetch_file&path=resources/testharness.js"></script>
+  <script src="SUBRESOURCE_PREFIX:&dispatch=fetch_file&path=fetch/connection-pool/resources/network-partition-key.js"></script>
+</head>
+<body>
+<script>
+  async function fetch_and_reply() {
+    // If this is a top level window, report to the opener. Otherwise, this is an iframe,
+    // so report to the parent.
+    var report_to = window.opener;
+    if (!report_to)
+      report_to = window.parent;
+    try {
+       await check_partition_ids();
+       report_to.postMessage({result: 'success'}, '*');
+    } catch (e) {
+     report_to.postMessage({result: 'error', details: e.message}, '*');
+    }
+  }
+  fetch_and_reply();
+</script>
+</body>
+</html>
diff --git a/test/wpt/tests/fetch/connection-pool/resources/network-partition-iframe-checker.html b/test/wpt/tests/fetch/connection-pool/resources/network-partition-iframe-checker.html
new file mode 100644
index 00000000000..f76ed184471
--- /dev/null
+++ b/test/wpt/tests/fetch/connection-pool/resources/network-partition-iframe-checker.html
@@ -0,0 +1,22 @@
+<!doctype html>
+<html>
+<head>
+  <meta charset="utf-8">
+  <title>Iframe Network Partition Checker</title>
+  <meta name="help" href="https://fetch.spec.whatwg.org/#network-partition-keys">
+  <meta name="timeout" content="normal">
+  <script src="SUBRESOURCE_PREFIX:&dispatch=fetch_file&path=common/utils.js"></script>
+  <script src="SUBRESOURCE_PREFIX:&dispatch=fetch_file&path=resources/testharness.js"></script>
+  <script src="SUBRESOURCE_PREFIX:&dispatch=fetch_file&path=fetch/connection-pool/resources/network-partition-key.js"></script>
+</head>
+<body>
+<script>
+  // Listen for first message from the iframe, and pass it back to the opener.
+  function message_listener(event) {
+    window.opener.postMessage(event.data, '*');
+  }
+  window.addEventListener('message', message_listener, {once: 'true'});
+</script>
+<iframe src="SUBRESOURCE_PREFIX:&dispatch=fetch_file&path=fetch/connection-pool/resources/network-partition-checker.html"></iframe>
+</body>
+</html>
diff --git a/test/wpt/tests/fetch/connection-pool/resources/network-partition-key.js b/test/wpt/tests/fetch/connection-pool/resources/network-partition-key.js
new file mode 100644
index 00000000000..bd66109380f
--- /dev/null
+++ b/test/wpt/tests/fetch/connection-pool/resources/network-partition-key.js
@@ -0,0 +1,47 @@
+// Runs multiple fetches that validate connections see only a single partition_id.
+// Requests are run in parallel so that they use multiple connections to maximize the
+// chance of exercising all matching connections in the connection pool. Only returns
+// once all requests have completed to make cleaning up server state non-racy.
+function check_partition_ids(location) {
+  const NUM_FETCHES = 20;
+
+  var base_url = 'SUBRESOURCE_PREFIX:&dispatch=check_partition';
+
+  // Not a perfect parse of the query string, but good enough for this test.
+  var include_credentials = base_url.search('include_credentials=true') != -1;
+  var exclude_credentials = base_url.search('include_credentials=false') != -1;
+  if (include_credentials != !exclude_credentials)
+    throw new Exception('Credentials mode not specified');
+
+
+  // Run NUM_FETCHES in parallel.
+  var fetches = [];
+  for (i = 0; i < NUM_FETCHES; ++i) {
+    var fetch_params = {
+      credentials: 'omit',
+      mode: 'cors',
+      headers: {
+        'Header-To-Force-CORS': 'cors'
+      },
+    };
+
+    // Use a unique URL for each request, in case the caching layer serializes multiple
+    // requests for the same URL.
+    var url = `${base_url}&${token()}`;
+
+    fetches.push(fetch(url, fetch_params).then(
+        function (response) {
+          return response.text().then(function(text) {
+            assert_equals(text, 'ok', `Socket unexpectedly reused`);
+          });
+        }));
+  }
+
+  // Wait for all promises to complete.
+  return Promise.allSettled(fetches).then(function (results) {
+    results.forEach(function (result) {
+      if (result.status != 'fulfilled')
+        throw result.reason;
+    });
+  });
+}
diff --git a/test/wpt/tests/fetch/connection-pool/resources/network-partition-key.py b/test/wpt/tests/fetch/connection-pool/resources/network-partition-key.py
new file mode 100644
index 00000000000..32fe4999b7d
--- /dev/null
+++ b/test/wpt/tests/fetch/connection-pool/resources/network-partition-key.py
@@ -0,0 +1,130 @@
+import mimetypes
+import os
+
+from wptserve.utils import isomorphic_decode, isomorphic_encode
+
+# Test server that tracks the last partition_id was used with each connection for each uuid, and
+# lets consumers query if multiple different partition_ids have been been used for any socket.
+#
+# Server assumes that ports aren't reused, so a client address and a server port uniquely identify
+# a connection. If that constraint is ever violated, the test will be flaky. No sockets being
+# closed for the duration of the test is sufficient to ensure that, though even if sockets are
+# closed, the OS should generally prefer to use new ports for new connections, if any are
+# available.
+def main(request, response):
+    response.headers.set(b"Cache-Control", b"no-store")
+    dispatch = request.GET.first(b"dispatch", None)
+    uuid = request.GET.first(b"uuid", None)
+    partition_id = request.GET.first(b"partition_id", None)
+
+    if not uuid or not dispatch or not partition_id:
+        return simple_response(request, response, 404, b"Not found", b"Invalid query parameters")
+
+    # Unless nocheck_partition is true, check partition_id against server_state, and update server_state.
+    stash = request.server.stash
+    test_failed = False
+    request_count = 0;
+    connection_count = 0;
+    if request.GET.first(b"nocheck_partition", None) != b"True":
+        # Need to grab the lock to access the Stash, since requests are made in parallel.
+        with stash.lock:
+            # Don't use server hostname here, since H2 allows multiple hosts to reuse a connection.
+            # Server IP is not currently available, unfortunately.
+            address_key = isomorphic_encode(str(request.client_address) + u"|" + str(request.url_parts.port))
+            server_state = stash.take(uuid) or {b"test_failed": False,
+              b"request_count": 0, b"connection_count": 0}
+            request_count = server_state[b"request_count"]
+            request_count += 1
+            server_state[b"request_count"] = request_count
+            if address_key in server_state:
+                if server_state[address_key] != partition_id:
+                    server_state[b"test_failed"] = True
+            else:
+                connection_count = server_state[b"connection_count"]
+                connection_count += 1
+                server_state[b"connection_count"] = connection_count
+            server_state[address_key] = partition_id
+            test_failed = server_state[b"test_failed"]
+            stash.put(uuid, server_state)
+
+    origin = request.headers.get(b"Origin")
+    if origin:
+        response.headers.set(b"Access-Control-Allow-Origin", origin)
+        response.headers.set(b"Access-Control-Allow-Credentials", b"true")
+
+    if request.method == u"OPTIONS":
+        return handle_preflight(request, response)
+
+    if dispatch == b"fetch_file":
+        return handle_fetch_file(request, response, partition_id, uuid)
+
+    if dispatch == b"check_partition":
+        status = request.GET.first(b"status", 200)
+        if test_failed:
+            return simple_response(request, response, status, b"OK", b"Multiple partition IDs used on a socket")
+        body = b"ok"
+        if request.GET.first(b"addcounter", False):
+            body += (". Request was sent " + str(request_count) + " times. " +
+             str(connection_count) + " connections were created.").encode('utf-8')
+        return simple_response(request, response, status, b"OK", body)
+
+    if dispatch == b"clean_up":
+        stash.take(uuid)
+        if test_failed:
+            return simple_response(request, response, 200, b"OK", b"Test failed, but cleanup completed.")
+        return simple_response(request, response, 200, b"OK", b"cleanup complete")
+
+    return simple_response(request, response, 404, b"Not Found", b"Unrecognized dispatch parameter: " + dispatch)
+
+def handle_preflight(request, response):
+    response.status = (200, b"OK")
+    response.headers.set(b"Access-Control-Allow-Methods", b"GET")
+    response.headers.set(b"Access-Control-Allow-Headers", b"header-to-force-cors")
+    response.headers.set(b"Access-Control-Max-Age", b"86400")
+    return b"Preflight request"
+
+def simple_response(request, response, status_code, status_message, body, content_type=b"text/plain"):
+    response.status = (status_code, status_message)
+    response.headers.set(b"Content-Type", content_type)
+    return body
+
+def handle_fetch_file(request, response, partition_id, uuid):
+    subresource_origin = request.GET.first(b"subresource_origin", None)
+    rel_path = request.GET.first(b"path", None)
+
+    # This needs to be passed on to subresources so they all have access to it.
+    include_credentials = request.GET.first(b"include_credentials", None)
+    if not subresource_origin or not rel_path or not include_credentials:
+        return simple_response(request, response, 404, b"Not found", b"Invalid query parameters")
+
+    cur_path = os.path.realpath(isomorphic_decode(__file__))
+    base_path = os.path.abspath(os.path.join(os.path.dirname(cur_path), os.pardir, os.pardir, os.pardir))
+    path = os.path.abspath(os.path.join(base_path, isomorphic_decode(rel_path)))
+
+    # Basic security check.
+    if not path.startswith(base_path):
+        return simple_response(request, response, 404, b"Not found", b"Invalid path")
+
+    sandbox = request.GET.first(b"sandbox", None)
+    if sandbox == b"true":
+        response.headers.set(b"Content-Security-Policy", b"sandbox allow-scripts")
+
+    file = open(path, mode="rb")
+    body = file.read()
+    file.close()
+
+    subresource_path = b"/" + isomorphic_encode(os.path.relpath(isomorphic_decode(__file__), base_path)).replace(b'\\', b'/')
+    subresource_params = b"?partition_id=" + partition_id + b"&uuid=" + uuid + b"&subresource_origin=" + subresource_origin + b"&include_credentials=" + include_credentials
+    body = body.replace(b"SUBRESOURCE_PREFIX:", subresource_origin + subresource_path + subresource_params)
+
+    other_origin = request.GET.first(b"other_origin", None)
+    if other_origin:
+        body = body.replace(b"OTHER_PREFIX:", other_origin + subresource_path + subresource_params)
+
+    mimetypes.init()
+    mimetype_pair = mimetypes.guess_type(path)
+    mimetype = mimetype_pair[0]
+
+    if mimetype == None or mimetype_pair[1] != None:
+        return simple_response(request, response, 500, b"Server Error", b"Unknown MIME type")
+    return simple_response(request, response, 200, b"OK", body, mimetype)
diff --git a/test/wpt/tests/fetch/connection-pool/resources/network-partition-worker-checker.html b/test/wpt/tests/fetch/connection-pool/resources/network-partition-worker-checker.html
new file mode 100644
index 00000000000..e6b7ea7673f
--- /dev/null
+++ b/test/wpt/tests/fetch/connection-pool/resources/network-partition-worker-checker.html
@@ -0,0 +1,24 @@
+<!doctype html>
+<html>
+<head>
+  <meta charset="utf-8">
+  <title>Worker Network Partition Checker</title>
+  <meta name="help" href="https://fetch.spec.whatwg.org/#network-partition-keys">
+  <meta name="timeout" content="normal">
+  <script src="SUBRESOURCE_PREFIX:&dispatch=fetch_file&path=common/utils.js"></script>
+  <script src="SUBRESOURCE_PREFIX:&dispatch=fetch_file&path=resources/testharness.js"></script>
+  <script src="SUBRESOURCE_PREFIX:&dispatch=fetch_file&path=fetch/connection-pool/resources/network-partition-key.js"></script>
+</head>
+<body>
+<script>
+    // Workers must be same origin as the page loading them, but it's simpler to reuse the
+    // OTHER_PREFIX mechanism in the Python code than to craft the URL in Javascript here.
+    var worker = new Worker('OTHER_PREFIX:&dispatch=fetch_file&path=fetch/connection-pool/resources/network-partition-worker.js');
+    function message_listener(event) {
+      window.opener.postMessage(event.data, '*');
+      worker.terminate();
+    }
+    worker.addEventListener('message', message_listener);
+</script>
+</body>
+</html>
diff --git a/test/wpt/tests/fetch/connection-pool/resources/network-partition-worker.js b/test/wpt/tests/fetch/connection-pool/resources/network-partition-worker.js
new file mode 100644
index 00000000000..1745edfacb1
--- /dev/null
+++ b/test/wpt/tests/fetch/connection-pool/resources/network-partition-worker.js
@@ -0,0 +1,15 @@
+// This tests the partition key of fetches to subresouce_origin made by the worker and
+// imported scripts from subresource_origin.
+importScripts('SUBRESOURCE_PREFIX:&dispatch=fetch_file&path=common/utils.js');
+importScripts('SUBRESOURCE_PREFIX:&dispatch=fetch_file&path=resources/testharness.js');
+importScripts('SUBRESOURCE_PREFIX:&dispatch=fetch_file&path=fetch/connection-pool/resources/network-partition-key.js');
+
+async function fetch_and_reply() {
+  try {
+     await check_partition_ids();
+     self.postMessage({result: 'success'});
+  } catch (e) {
+    self.postMessage({result: 'error', details: e.message});
+  }
+}
+fetch_and_reply();
diff --git a/test/wpt/tests/fetch/content-encoding/resources/bad-gzip-body.py b/test/wpt/tests/fetch/content-encoding/resources/bad-gzip-body.py
new file mode 100644
index 00000000000..a79b94ed041
--- /dev/null
+++ b/test/wpt/tests/fetch/content-encoding/resources/bad-gzip-body.py
@@ -0,0 +1,3 @@
+def main(request, response):
+    headers = [(b"Content-Encoding", b"gzip")]
+    return headers, b"not actually gzip"
diff --git a/test/wpt/tests/fetch/content-length/api-and-duplicate-headers.any.js b/test/wpt/tests/fetch/content-length/api-and-duplicate-headers.any.js
new file mode 100644
index 00000000000..8015289f8d6
--- /dev/null
+++ b/test/wpt/tests/fetch/content-length/api-and-duplicate-headers.any.js
@@ -0,0 +1,23 @@
+promise_test(async t => {
+  const response = await fetch("resources/identical-duplicates.asis");
+  assert_equals(response.statusText, "BLAH");
+  assert_equals(response.headers.get("test"), "x, x");
+  assert_equals(response.headers.get("content-type"), "text/plain, text/plain");
+  assert_equals(response.headers.get("content-length"), "6, 6");
+  const text = await response.text();
+  assert_equals(text, "Test.\n");
+}, "fetch() and duplicate Content-Length/Content-Type headers");
+
+async_test(t => {
+  const xhr = new XMLHttpRequest();
+  xhr.open("GET", "resources/identical-duplicates.asis");
+  xhr.send();
+  xhr.onload = t.step_func_done(() => {
+    assert_equals(xhr.statusText, "BLAH");
+    assert_equals(xhr.getResponseHeader("test"), "x, x");
+    assert_equals(xhr.getResponseHeader("content-type"), "text/plain, text/plain");
+    assert_equals(xhr.getResponseHeader("content-length"), "6, 6");
+    assert_equals(xhr.getAllResponseHeaders(), "content-length: 6, 6\r\ncontent-type: text/plain, text/plain\r\ntest: x, x\r\n");
+    assert_equals(xhr.responseText, "Test.\n");
+  });
+}, "XMLHttpRequest and duplicate Content-Length/Content-Type headers");
diff --git a/test/wpt/tests/fetch/content-length/content-length.html b/test/wpt/tests/fetch/content-length/content-length.html
new file mode 100644
index 00000000000..cda9b5b5237
--- /dev/null
+++ b/test/wpt/tests/fetch/content-length/content-length.html
@@ -0,0 +1,14 @@
+<!DOCTYPE html>
+<!-- CAUTION: if updating this test also update the expected content-length in the .headers file -->
+<title>Content-Length Test</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script>
+setup({ single_test: true });
+onload = function() {
+  assert_equals(document.body.textContent, "PASS");
+  done();
+}
+</script>
+<body>PASS
+but FAIL if this is in the body.
\ No newline at end of file
diff --git a/test/wpt/tests/fetch/content-length/content-length.html.headers b/test/wpt/tests/fetch/content-length/content-length.html.headers
new file mode 100644
index 00000000000..25389b7c0fa
--- /dev/null
+++ b/test/wpt/tests/fetch/content-length/content-length.html.headers
@@ -0,0 +1 @@
+Content-Length: 403
diff --git a/test/wpt/tests/fetch/content-length/parsing.window.js b/test/wpt/tests/fetch/content-length/parsing.window.js
new file mode 100644
index 00000000000..5028ad943de
--- /dev/null
+++ b/test/wpt/tests/fetch/content-length/parsing.window.js
@@ -0,0 +1,18 @@
+promise_test(() => {
+  return fetch("resources/content-lengths.json").then(res => res.json()).then(runTests);
+}, "Loading JSON…");
+
+function runTests(testUnits) {
+  testUnits.forEach(({ input, output }) => {
+    promise_test(t => {
+      const result = fetch(`resources/content-length.py?length=${encodeURIComponent(input)}`);
+      if (output === null) {
+        return promise_rejects_js(t, TypeError, result);
+      } else {
+        return result.then(res => res.text()).then(text => {
+          assert_equals(text.length, output);
+        });
+      }
+    }, `Input: ${format_value(input)}. Expected: ${output === null ? "network error" : output}.`);
+  });
+}
diff --git a/test/wpt/tests/fetch/content-length/resources/content-length.py b/test/wpt/tests/fetch/content-length/resources/content-length.py
new file mode 100644
index 00000000000..92cfadeb061
--- /dev/null
+++ b/test/wpt/tests/fetch/content-length/resources/content-length.py
@@ -0,0 +1,10 @@
+def main(request, response):
+    response.add_required_headers = False
+    output =  b"HTTP/1.1 200 OK\r\n"
+    output += b"Content-Type: text/plain;charset=UTF-8\r\n"
+    output += b"Connection: close\r\n"
+    output += request.GET.first(b"length") + b"\r\n"
+    output += b"\r\n"
+    output += b"Fact: this is really forty-two bytes long."
+    response.writer.write(output)
+    response.close_connection = True
diff --git a/test/wpt/tests/fetch/content-length/resources/content-lengths.json b/test/wpt/tests/fetch/content-length/resources/content-lengths.json
new file mode 100644
index 00000000000..dac9c82dc09
--- /dev/null
+++ b/test/wpt/tests/fetch/content-length/resources/content-lengths.json
@@ -0,0 +1,126 @@
+[
+  {
+    "input": "Content-Length: 42",
+    "output": 42
+  },
+  {
+    "input": "Content-Length: 42,42",
+    "output": 42
+  },
+  {
+    "input": "Content-Length: 42\r\nContent-Length: 42",
+    "output": 42
+  },
+  {
+    "input": "Content-Length: 42\r\nContent-Length: 42,42",
+    "output": 42
+  },
+  {
+    "input": "Content-Length: 30",
+    "output": 30
+  },
+  {
+    "input": "Content-Length: 30,30",
+    "output": 30
+  },
+  {
+    "input": "Content-Length: 30\r\nContent-Length: 30",
+    "output": 30
+  },
+  {
+    "input": "Content-Length: 30\r\nContent-Length: 30,30",
+    "output": 30
+  },
+  {
+    "input": "Content-Length: 42,30",
+    "output": null
+  },
+  {
+    "input": "Content-Length: 30,42",
+    "output": null
+  },
+  {
+    "input": "Content-Length: 42\r\nContent-Length: 30",
+    "output": null
+  },
+  {
+    "input": "Content-Length: 30\r\nContent-Length: 42",
+    "output": null
+  },
+  {
+    "input": "Content-Length: 30,",
+    "output": null
+  },
+  {
+    "input": "Content-Length: ,30",
+    "output": null
+  },
+  {
+    "input": "Content-Length: 30\r\nContent-Length: \t",
+    "output": null
+  },
+  {
+    "input": "Content-Length: \r\nContent-Length: 30",
+    "output": null
+  },
+  {
+    "input": "Content-Length: aaaah\r\nContent-Length: nah",
+    "output": null
+  },
+  {
+    "input": "Content-Length: aaaah, nah",
+    "output": null
+  },
+  {
+    "input": "Content-Length: aaaah\r\nContent-Length: aaaah",
+    "output": 42
+  },
+  {
+    "input": "Content-Length: aaaah, aaaah",
+    "output": 42
+  },
+  {
+    "input": "Content-Length: aaaah",
+    "output": 42
+  },
+  {
+    "input": "Content-Length: 42s",
+    "output": 42
+  },
+  {
+    "input": "Content-Length: 30s",
+    "output": 42
+  },
+  {
+    "input": "Content-Length: -1",
+    "output": 42
+  },
+  {
+    "input": "Content-Length: 0x20",
+    "output": 42
+  },
+  {
+    "input": "Content-Length: 030",
+    "output": 30
+  },
+  {
+    "input": "Content-Length: 030\r\nContent-Length: 30",
+    "output": null
+  },
+  {
+    "input": "Content-Length: 030, 30",
+    "output": null
+  },
+  {
+    "input": "Content-Length: \"30\"",
+    "output": 42
+  },
+  {
+    "input": "Content-Length:30\r\nContent-Length:,\r\nContent-Length:30",
+    "output": null
+  },
+  {
+    "input": "Content-Length: ",
+    "output": 42
+  }
+]
diff --git a/test/wpt/tests/fetch/content-length/resources/identical-duplicates.asis b/test/wpt/tests/fetch/content-length/resources/identical-duplicates.asis
new file mode 100644
index 00000000000..f38c9a4b8a0
--- /dev/null
+++ b/test/wpt/tests/fetch/content-length/resources/identical-duplicates.asis
@@ -0,0 +1,9 @@
+HTTP/1.1 200 BLAH
+Test: x
+Test: x
+Content-Type: text/plain
+Content-Type: text/plain
+Content-Length: 6
+Content-Length: 6
+
+Test.
diff --git a/test/wpt/tests/fetch/content-length/too-long.window.js b/test/wpt/tests/fetch/content-length/too-long.window.js
new file mode 100644
index 00000000000..f8cefaa9c23
--- /dev/null
+++ b/test/wpt/tests/fetch/content-length/too-long.window.js
@@ -0,0 +1,4 @@
+promise_test(async t => {
+  const result = await fetch(`resources/content-length.py?length=${encodeURIComponent("Content-Length: 50")}`);
+  await promise_rejects_js(t, TypeError, result.text());
+}, "Content-Length header value of network response exceeds response body");
diff --git a/test/wpt/tests/fetch/content-type/README.md b/test/wpt/tests/fetch/content-type/README.md
new file mode 100644
index 00000000000..f553b7ee8e6
--- /dev/null
+++ b/test/wpt/tests/fetch/content-type/README.md
@@ -0,0 +1,20 @@
+# `resources/content-types.json`
+
+An array of tests. Each test has these fields:
+
+* `contentType`: an array of values for the `Content-Type` header. A harness needs to run the test twice if there are multiple values. One time with the values concatenated with `,` followed by a space and one time with multiple `Content-Type` declarations, each on their own line with one of the values, in order.
+* `encoding`: the expected encoding, null for the default.
+* `mimeType`: the result of extracting a MIME type and serializing it.
+* `documentContentType`: the MIME type expected to be exposed in DOM documents.
+
+(These tests are currently somewhat geared towards browser use, but could be generalized easily enough if someone wanted to contribute tests for MIME types that would cause downloads in the browser or some such.)
+
+# `resources/script-content-types.json`
+
+An array of tests, surprise. Each test has these fields:
+
+* `contentType`: see above.
+* `executes`: whether the script is expected to execute.
+* `encoding`: how the script is expected to be decoded.
+
+These tests are expected to be loaded through `<script src>` and the server is expected to set `X-Content-Type-Options: nosniff`.
diff --git a/test/wpt/tests/fetch/content-type/multipart.window.js b/test/wpt/tests/fetch/content-type/multipart.window.js
new file mode 100644
index 00000000000..03b037a0e62
--- /dev/null
+++ b/test/wpt/tests/fetch/content-type/multipart.window.js
@@ -0,0 +1,33 @@
+// META: title=Ensure capital letters can be used in the boundary value.
+setup({ single_test: true });
+(async () => {
+  const form_string =
+    "--Boundary_with_capital_letters\r\n" +
+    "Content-Type: application/json\r\n" +
+    'Content-Disposition: form-data; name="does_this_work"\r\n' +
+    "\r\n" +
+    'YES\r\n' +
+    "--Boundary_with_capital_letters--\r\n";
+
+  const r = new Response(new Blob([form_string]), {
+    headers: [
+      [
+        "Content-Type",
+        "multipart/form-data; boundary=Boundary_with_capital_letters",
+      ],
+    ],
+  });
+
+  var s = "";
+  try {
+    const fd = await r.formData();
+    for (const [key, value] of fd.entries()) {
+      s += (`${key} = ${value}`);
+    }
+  } catch (ex) {
+    s = ex;
+  }
+
+  assert_equals(s, "does_this_work = YES");
+  done();
+})();
diff --git a/test/wpt/tests/fetch/content-type/resources/content-type.py b/test/wpt/tests/fetch/content-type/resources/content-type.py
new file mode 100644
index 00000000000..1f077b62899
--- /dev/null
+++ b/test/wpt/tests/fetch/content-type/resources/content-type.py
@@ -0,0 +1,18 @@
+from wptserve.utils import isomorphic_encode
+
+def main(request, response):
+    values = request.GET.get_list(b"value")
+    content = request.GET.first(b"content", b"<b>hi</b>\n")
+    output = b"HTTP/1.1 200 OK\r\n"
+    output += b"X-Content-Type-Options: nosniff\r\n"
+    if b"single_header" in request.GET:
+        output += b"Content-Type: " + b",".join(values) + b"\r\n"
+    else:
+        for value in values:
+            output += b"Content-Type: " + value + b"\r\n"
+    output += b"Content-Length: " + isomorphic_encode(str(len(content))) + b"\r\n"
+    output += b"Connection: close\r\n"
+    output += b"\r\n"
+    output += content
+    response.writer.write(output)
+    response.close_connection = True
diff --git a/test/wpt/tests/fetch/content-type/resources/content-types.json b/test/wpt/tests/fetch/content-type/resources/content-types.json
new file mode 100644
index 00000000000..9578fc503cf
--- /dev/null
+++ b/test/wpt/tests/fetch/content-type/resources/content-types.json
@@ -0,0 +1,122 @@
+[
+  {
+    "contentType": ["", "text/plain"],
+    "encoding": null,
+    "mimeType": "text/plain",
+    "documentContentType": "text/plain"
+  },
+  {
+    "contentType": ["text/plain", ""],
+    "encoding": null,
+    "mimeType": "text/plain",
+    "documentContentType": "text/plain"
+  },
+  {
+    "contentType": ["text/html", "text/plain"],
+    "encoding": null,
+    "mimeType": "text/plain",
+    "documentContentType": "text/plain"
+  },
+  {
+    "contentType": ["text/plain;charset=gbk", "text/html"],
+    "encoding": null,
+    "mimeType": "text/html",
+    "documentContentType": "text/html"
+  },
+  {
+    "contentType": ["text/plain;charset=gbk", "text/html;charset=windows-1254"],
+    "encoding": "windows-1254",
+    "mimeType": "text/html;charset=windows-1254",
+    "documentContentType": "text/html"
+  },
+  {
+    "contentType": ["text/plain;charset=gbk", "text/plain"],
+    "encoding": "GBK",
+    "mimeType": "text/plain;charset=gbk",
+    "documentContentType": "text/plain"
+  },
+  {
+    "contentType": ["text/plain;charset=gbk", "text/plain;charset=windows-1252"],
+    "encoding": "windows-1252",
+    "mimeType": "text/plain;charset=windows-1252",
+    "documentContentType": "text/plain"
+  },
+  {
+    "contentType": ["text/html;charset=gbk", "text/html;x=\",text/plain"],
+    "encoding": "GBK",
+    "mimeType": "text/html;x=\",text/plain\";charset=gbk",
+    "documentContentType": "text/html"
+  },
+  {
+    "contentType": ["text/plain;charset=gbk;x=foo", "text/plain"],
+    "encoding": "GBK",
+    "mimeType": "text/plain;charset=gbk",
+    "documentContentType": "text/plain"
+  },
+  {
+    "contentType": ["text/html;charset=gbk", "text/plain", "text/html"],
+    "encoding": null,
+    "mimeType": "text/html",
+    "documentContentType": "text/html"
+  },
+  {
+    "contentType": ["text/plain", "*/*"],
+    "encoding": null,
+    "mimeType": "text/plain",
+    "documentContentType": "text/plain"
+  },
+  {
+    "contentType": ["text/html", "*/*"],
+    "encoding": null,
+    "mimeType": "text/html",
+    "documentContentType": "text/html"
+  },
+  {
+    "contentType": ["*/*", "text/html"],
+    "encoding": null,
+    "mimeType": "text/html",
+    "documentContentType": "text/html"
+  },
+  {
+    "contentType": ["text/plain", "*/*;charset=gbk"],
+    "encoding": null,
+    "mimeType": "text/plain",
+    "documentContentType": "text/plain"
+  },
+  {
+    "contentType": ["text/html", "*/*;charset=gbk"],
+    "encoding": null,
+    "mimeType": "text/html",
+    "documentContentType": "text/html"
+  },
+  {
+    "contentType": ["text/html;x=\"", "text/plain"],
+    "encoding": null,
+    "mimeType": "text/html;x=\", text/plain\"",
+    "documentContentType": "text/html"
+  },
+  {
+    "contentType": ["text/html;\"", "text/plain"],
+    "encoding": null,
+    "mimeType": "text/html",
+    "documentContentType": "text/html"
+  },
+  {
+    "contentType": ["text/html;\"", "\\\"", "text/plain"],
+    "encoding": null,
+    "mimeType": "text/html",
+    "documentContentType": "text/html"
+  },
+  {
+    "contentType": ["text/html;\"", "\\\"", "text/plain", "\";charset=GBK"],
+    "encoding": "GBK",
+    "mimeType": "text/html;charset=GBK",
+    "documentContentType": "text/html"
+  },
+  {
+    "contentType": ["text/html;\"",  "\"", "text/plain"],
+    "encoding": null,
+    "mimeType": "text/plain",
+    "documentContentType": "text/plain"
+  }
+]
diff --git a/test/wpt/tests/fetch/content-type/resources/script-content-types.json b/test/wpt/tests/fetch/content-type/resources/script-content-types.json
new file mode 100644
index 00000000000..b8a843bcd82
--- /dev/null
+++ b/test/wpt/tests/fetch/content-type/resources/script-content-types.json
@@ -0,0 +1,92 @@
+[
+  {
+    "contentType": ["text/javascript;charset=windows-1252"],
+    "executes": true,
+    "encoding": "windows-1252"
+  },
+  {
+    "contentType": ["text/javascript;\";charset=windows-1252"],
+    "executes": true,
+    "encoding": "windows-1252"
+  },
+  {
+    "contentType": ["text/javascript\u000C"],
+    "executes": false,
+    "encoding": null
+  },
+  {
+    "contentType": ["\"text/javascript\""],
+    "executes": false,
+    "encoding": null
+  },
+  {
+    "contentType": ["text/ javascript"],
+    "executes": false,
+    "encoding": null
+  },
+  {
+    "contentType": ["text /javascript"],
+    "executes": false,
+    "encoding": null
+  },
+  {
+    "contentType": ["x/x", "text/javascript"],
+    "executes": true,
+    "encoding": null
+  },
+  {
+    "contentType": ["x/x;charset=windows-1252", "text/javascript"],
+    "executes": true,
+    "encoding": null
+  },
+  {
+    "contentType": ["text/javascript", "x/x"],
+    "executes": false,
+    "encoding": null
+  },
+  {
+    "contentType": ["text/javascript; charset=windows-1252", "text/javascript"],
+    "executes": true,
+    "encoding": "windows-1252"
+  },
+  {
+    "contentType": ["text/javascript;\"", "x/x"],
+    "executes": true,
+    "encoding": null
+  },
+  {
+    "contentType": ["text/javascript", ""],
+    "executes": true,
+    "encoding": null
+  },
+  {
+    "contentType": ["text/javascript", "error"],
+    "executes": true,
+    "encoding": null
+  },
+  {
+    "contentType": ["text/javascript;charset=windows-1252", "x/x", "text/javascript"],
+    "executes": true,
+    "encoding": null
+  },
+  {
+    "contentType": ["text/javascript;charset=windows-1252", "error", "text/javascript"],
+    "executes": true,
+    "encoding": "windows-1252"
+  },
+  {
+    "contentType": ["text/javascript;charset=windows-1252", "", "text/javascript"],
+    "executes": true,
+    "encoding": "windows-1252"
+  },
+  {
+    "contentType": ["text/javascript;charset=windows-1252;\"", "\\\"", "x/x"],
+    "executes": true,
+    "encoding": "windows-1252"
+  },
+  {
+    "contentType": ["x/x;\"", "x/y;\\\"", "text/javascript;charset=windows-1252;\"", "text/javascript"],
+    "executes": true,
+    "encoding": null
+  }
+]
diff --git a/test/wpt/tests/fetch/content-type/response.window.js b/test/wpt/tests/fetch/content-type/response.window.js
new file mode 100644
index 00000000000..746f51c9bb5
--- /dev/null
+++ b/test/wpt/tests/fetch/content-type/response.window.js
@@ -0,0 +1,72 @@
+promise_test(() => {
+  return fetch("resources/content-types.json").then(res => res.json()).then(runTests);
+}, "Loading JSON…");
+
+function runTests(tests) {
+  tests.forEach(testUnit => {
+    runFrameTest(testUnit, false);
+    runFrameTest(testUnit, true);
+    runFetchTest(testUnit, false);
+    runFetchTest(testUnit, true);
+    runRequestResponseTest(testUnit, "Request");
+    runRequestResponseTest(testUnit, "Response");
+  });
+}
+
+function runFrameTest(testUnit, singleHeader) {
+  // Note: window.js is always UTF-8
+  const encoding = testUnit.encoding !== null ? testUnit.encoding : "UTF-8";
+  async_test(t => {
+    const frame = document.body.appendChild(document.createElement("iframe"));
+    t.add_cleanup(() => frame.remove());
+    frame.src = getURL(testUnit.contentType, singleHeader);
+    frame.onload = t.step_func_done(() => {
+      // Edge requires toUpperCase()
+      const doc = frame.contentDocument;
+      assert_equals(doc.characterSet.toUpperCase(), encoding.toUpperCase());
+      if (testUnit.documentContentType === "text/plain") {
+        assert_equals(doc.body.textContent, "<b>hi</b>\n");
+      } else if (testUnit.documentContentType === "text/html") {
+        assert_equals(doc.body.firstChild.localName, "b");
+        assert_equals(doc.body.firstChild.textContent, "hi");
+      }
+      assert_equals(doc.contentType, testUnit.documentContentType);
+    });
+  }, getDesc("<iframe>", testUnit.contentType, singleHeader));
+}
+
+function getDesc(type, input, singleHeader) {
+  return type + ": " + (singleHeader ? "combined" : "separate") + " response Content-Type: " + input.join(" ");
+}
+
+function getURL(input, singleHeader) {
+  // Edge does not support URLSearchParams
+  let url = "resources/content-type.py?"
+  if (singleHeader) {
+    url += "single_header&"
+  }
+  input.forEach(val => {
+    url += "value=" + encodeURIComponent(val) + "&";
+  });
+  return url;
+}
+
+function runFetchTest(testUnit, singleHeader) {
+  promise_test(async t => {
+    const blob = await (await fetch(getURL(testUnit.contentType, singleHeader))).blob();
+    assert_equals(blob.type, testUnit.mimeType);
+  }, getDesc("fetch()", testUnit.contentType, singleHeader));
+}
+
+function runRequestResponseTest(testUnit, stringConstructor) {
+  promise_test(async t => {
+    // Cannot give Response a body as that will set Content-Type, but Request needs a URL
+    const constructorArgument = stringConstructor === "Request" ? "about:blank" : undefined;
+    const r = new self[stringConstructor](constructorArgument);
+    testUnit.contentType.forEach(val => {
+      r.headers.append("Content-Type", val);
+    });
+    const blob = await r.blob();
+    assert_equals(blob.type, testUnit.mimeType);
+  }, getDesc(stringConstructor, testUnit.contentType, true));
+}
diff --git a/test/wpt/tests/fetch/content-type/script.window.js b/test/wpt/tests/fetch/content-type/script.window.js
new file mode 100644
index 00000000000..31598957ef2
--- /dev/null
+++ b/test/wpt/tests/fetch/content-type/script.window.js
@@ -0,0 +1,48 @@
+promise_test(() => {
+  return fetch("resources/script-content-types.json").then(res => res.json()).then(runTests);
+}, "Loading JSON…");
+
+self.stringFromExecutedScript = undefined;
+
+function runTests(allTestData) {
+  allTestData.forEach(testData => {
+    runScriptTest(testData, false);
+    if (testData.contentType.length > 1) {
+      runScriptTest(testData, true);
+    }
+  });
+}
+
+function runScriptTest(testData, singleHeader) {
+  async_test(t => {
+    const script = document.createElement("script");
+      t.add_cleanup(() => {
+      script.remove()
+      self.stringFromExecutedScript = undefined;
+    });
+    script.src = getURL(testData.contentType, singleHeader);
+    document.head.appendChild(script);
+    if (testData.executes) {
+      script.onload = t.step_func_done(() => {
+        assert_equals(self.stringFromExecutedScript, testData.encoding === "windows-1252" ? "€" : "€");
+      });
+      script.onerror = t.unreached_func("onerror");
+    } else {
+      script.onerror = t.step_func_done();
+      script.onload = t.unreached_func("onload");
+    }
+  }, (singleHeader ? "combined" : "separate") + " " + testData.contentType.join(" "));
+}
+
+function getURL(input, singleHeader) {
+  // Edge does not support URLSearchParams
+  let url = "resources/content-type.py?"
+  if (singleHeader) {
+    url += "single_header&"
+  }
+  input.forEach(val => {
+    url += "value=" + encodeURIComponent(val) + "&";
+  });
+  url += "&content=" + encodeURIComponent("self.stringFromExecutedScript = \"€\"");
+  return url;
+}
diff --git a/test/wpt/tests/fetch/corb/README.md b/test/wpt/tests/fetch/corb/README.md
new file mode 100644
index 00000000000..f29562b0606
--- /dev/null
+++ b/test/wpt/tests/fetch/corb/README.md
@@ -0,0 +1,67 @@
+# Tests related to Cross-Origin Resource Blocking (CORB).
+
+### Summary
+
+This directory contains tests related to the
+[Cross-Origin Resource Blocking (CORB)](https://chromium.googlesource.com/chromium/src/+/main/services/network/cross_origin_read_blocking_explainer.md)
+algorithm.
+
+The tests in this directory interact with various, random features,
+but the tests have been grouped together into the `fetch/corb` directory,
+because all of these tests verify behavior that is important to the CORB
+algorithm.
+
+
+### CORB is not universally implemented yet
+
+CORB has been included
+in the [Fetch spec](https://fetch.spec.whatwg.org/#corb)
+since [May 2018](https://github.com/whatwg/fetch/pull/686).
+
+Some tests in this directory (e.g.
+`css-with-json-parser-breaker`) cover behavior spec-ed outside of CORB (making
+sure that CORB doesn't change the existing web behavior) and therefore are
+valuable independently from CORB's standardization efforts and should already
+be passing across all browsers.
+
+Tests that cover behavior that is changed by CORB are currently marked as
+[tentative](https://web-platform-tests.org/writing-tests/file-names.html)
+(using `.tentative` substring in their filename).
+Such tests may fail unless CORB is enabled.  In practice this means that:
+* Such tests will pass in Chromium
+  (where CORB is enabled by default [since M68](https://crrev.com/553830)).
+* Such tests may fail in other browsers.
+
+
+### Limitations of WPT test coverage
+
+CORB is a defense-in-depth and in general should not cause changes in behavior
+that can be observed by web features or by end users.  This makes CORB difficult
+or even impossible to test via WPT.
+
+WPT tests can cover the following:
+
+* Helping verify CORB has no observable impact in specific scenarios.
+  Examples:
+  * image rendering of (an empty response of) a html document blocked by CORB
+    should be indistinguishable from rendering such html document without CORB -
+    `img-html-correctly-labeled.sub.html`
+  * CORB shouldn't block responses that don't sniff as a CORB-protected document
+    type - `img-png-mislabeled-as-html.sub.html`
+* Helping document cases where CORB causes observable changes in behavior.
+  Examples:
+  * blocking of nosniff images labeled as non-image, CORB-protected
+    Content-Type - `img-png-mislabeled-as-html-nosniff.tentative.sub.html`
+  * blocking of CORB-protected documents can prevent triggering
+    syntax errors in scripts -
+    `script-html-via-cross-origin-blob-url.tentative.sub.html`
+* Helping verify which MIME types are protected by CORB.
+
+Examples of aspects that WPT tests cannot cover (these aspects have to be
+covered in other, browser-specific tests):
+* Verifying that CORB doesn't affect things that are only indirectly
+  observable by the web (like
+  [prefetch](https://html.spec.whatwg.org/#link-type-prefetch).
+* Verifying that CORB strips headers of blocked responses.
+* Verifying that CORB blocks responses before they reach the process hosting
+  a cross-origin execution context.
diff --git a/test/wpt/tests/fetch/corb/img-html-correctly-labeled.sub-ref.html b/test/wpt/tests/fetch/corb/img-html-correctly-labeled.sub-ref.html
new file mode 100644
index 00000000000..0e755969523
--- /dev/null
+++ b/test/wpt/tests/fetch/corb/img-html-correctly-labeled.sub-ref.html
@@ -0,0 +1,4 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<!-- Same-origin, so the HTTP response is not CORB-eligible -->
+<img src="resources/html-correctly-labeled.html">
diff --git a/test/wpt/tests/fetch/corb/img-html-correctly-labeled.sub.html b/test/wpt/tests/fetch/corb/img-html-correctly-labeled.sub.html
new file mode 100644
index 00000000000..844cd0c9270
--- /dev/null
+++ b/test/wpt/tests/fetch/corb/img-html-correctly-labeled.sub.html
@@ -0,0 +1,11 @@
+<!DOCTYPE html>
+<!-- Test verifies that html fed to an <img> tag doesn't have any observable
+  difference with and without CORB (in both cases the resource body cannot be
+  rendered as an image - html cannot be rendered as an image and the empty body
+  from a CORB-blocked response also cannot be rendered as an image).
+-->
+<meta charset="utf-8">
+<!-- Reference page uses same-origin resources, which are not CORB-eligible. -->
+<link rel="match" href="img-html-correctly-labeled.sub-ref.html">
+<!-- www1 is cross-origin, so the HTTP response is CORB-eligible -->
+<img src="http://{{domains[www1]}}:{{ports[http][0]}}/fetch/corb/resources/html-correctly-labeled.html">
diff --git a/test/wpt/tests/fetch/corb/img-mime-types-coverage.tentative.sub.html b/test/wpt/tests/fetch/corb/img-mime-types-coverage.tentative.sub.html
new file mode 100644
index 00000000000..e2386de2f2a
--- /dev/null
+++ b/test/wpt/tests/fetch/corb/img-mime-types-coverage.tentative.sub.html
@@ -0,0 +1,85 @@
+<!-- Test verifies that cross-origin, nosniff images are 1) blocked when their
+  MIME type is covered by CORB and 2) allowed otherwise.
+
+  This test is very similar to fetch/nosniff/images.html, except that
+  1) it deals with cross-origin images (CORB ignores same-origin fetches),
+  2) it focuses on MIME types relevant to CORB.
+  There are opportunities to unify the test here with nosniff tests *if*
+  we can also start blocking same-origin (or cors-allowed) images.  We
+  should try to gather data to quantify the impact of such change.
+-->
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<div id=log></div>
+<script>
+  var passes = [
+      // Empty or non-sensical MIME types
+      null, "", "x", "x/x",
+
+      // MIME-types not protected by CORB
+      "image/gif", "image/png", "image/png;blah", "image/svg+xml",
+      "application/javascript", "application/jsonp",
+      "application/dash+xml", // video format
+      "image/gif;HI=THERE",
+
+      // Non-image MIME-types that in practice get used for images on the web.
+      //
+      // https://bugzilla.mozilla.org/show_bug.cgi?id=1302539
+      "application/octet-stream",
+      // https://crbug.com/990853
+      "application/x-www-form-urlencoded",
+
+      // MIME types that may seem to be JSON or XML, but really aren't - i.e.
+      // these MIME types are not covered by:
+      // - https://mimesniff.spec.whatwg.org/#json-mime-type
+      // - https://mimesniff.spec.whatwg.org/#xml-mime-type
+      // - https://tools.ietf.org/html/rfc6839
+      // - https://tools.ietf.org/html/rfc7303
+      "text/x-json", "text/json+blah", "application/json+blah",
+      "text/xml+blah", "application/xml+blah",
+      "application/blahjson", "text/blahxml"]
+
+  var fails = [
+      // CORB-protected MIME-types - i.e. ones covered by:
+      // - https://mimesniff.spec.whatwg.org/#html-mime-type
+      // - https://mimesniff.spec.whatwg.org/#json-mime-type
+      // - https://mimesniff.spec.whatwg.org/#xml-mime-type
+      "text/html",
+      "text/json", "application/json", "text/xml", "application/xml",
+      "application/blah+json", "text/blah+json",
+      "application/blah+xml", "text/blah+xml",
+      "TEXT/HTML", "TEXT/JSON", "TEXT/BLAH+JSON", "APPLICATION/BLAH+XML",
+      "text/json;does=it;matter", "text/HTML;NO=it;does=NOT"]
+
+  const get_url = (mime) => {
+    // www1 is cross-origin, so the HTTP response is CORB-eligible -->
+    url = "http://{{domains[www1]}}:{{ports[http][0]}}"
+    url = url + "/fetch/nosniff/resources/image.py"
+    if (mime != null) {
+        url += "?type=" + encodeURIComponent(mime)
+    }
+    return url
+  }
+
+  passes.forEach(function(mime) {
+    async_test(function(t) {
+      var img = document.createElement("img")
+      img.onerror = t.unreached_func("Unexpected error event")
+      img.onload = t.step_func_done(function(){
+        assert_equals(img.width, 96)
+      })
+      img.src = get_url(mime)
+      document.body.appendChild(img)
+    }, "CORB should allow the response if Content-Type is: '" + mime + "'.  ")
+  })
+
+  fails.forEach(function(mime) {
+    async_test(function(t) {
+      var img = document.createElement("img")
+      img.onerror = t.step_func_done()
+      img.onload = t.unreached_func("Unexpected load event")
+      img.src = get_url(mime)
+      document.body.appendChild(img)
+    }, "CORB should block the response if Content-Type is: '" + mime + "'.  ")
+  })
+</script>
diff --git a/test/wpt/tests/fetch/corb/img-png-mislabeled-as-html-nosniff.tentative.sub-ref.html b/test/wpt/tests/fetch/corb/img-png-mislabeled-as-html-nosniff.tentative.sub-ref.html
new file mode 100644
index 00000000000..a771ed6a653
--- /dev/null
+++ b/test/wpt/tests/fetch/corb/img-png-mislabeled-as-html-nosniff.tentative.sub-ref.html
@@ -0,0 +1,4 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<!-- Same-origin, so the HTTP response is not CORB-eligible -->
+<img src="resources/empty-labeled-as-png.png">
diff --git a/test/wpt/tests/fetch/corb/img-png-mislabeled-as-html-nosniff.tentative.sub.html b/test/wpt/tests/fetch/corb/img-png-mislabeled-as-html-nosniff.tentative.sub.html
new file mode 100644
index 00000000000..82adc47b0cf
--- /dev/null
+++ b/test/wpt/tests/fetch/corb/img-png-mislabeled-as-html-nosniff.tentative.sub.html
@@ -0,0 +1,11 @@
+<!DOCTYPE html>
+<!-- Test verifies that CORB blocks an image mislabeled as text/html if
+  sniffing is disabled via `X-Content-Type-Options: nosniff` response header.
+  This has an observable effect (the image stops rendering), compared to the
+  behavior with no CORB.
+-->
+<meta charset="utf-8">
+<!-- Reference page uses same-origin resources, which are not CORB-eligible. -->
+<link rel="match" href="img-png-mislabeled-as-html-nosniff.tentative.sub-ref.html">
+<!-- www1 is cross-origin, so the HTTP response is CORB-eligible -->
+<img src="http://{{domains[www1]}}:{{ports[http][0]}}/fetch/corb/resources/png-mislabeled-as-html-nosniff.png">
diff --git a/test/wpt/tests/fetch/corb/img-png-mislabeled-as-html.sub-ref.html b/test/wpt/tests/fetch/corb/img-png-mislabeled-as-html.sub-ref.html
new file mode 100644
index 00000000000..ebb337dba80
--- /dev/null
+++ b/test/wpt/tests/fetch/corb/img-png-mislabeled-as-html.sub-ref.html
@@ -0,0 +1,4 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<!-- Same-origin, so the HTTP response is not CORB-eligible -->
+<img src="resources/png-correctly-labeled.png">
diff --git a/test/wpt/tests/fetch/corb/img-png-mislabeled-as-html.sub.html b/test/wpt/tests/fetch/corb/img-png-mislabeled-as-html.sub.html
new file mode 100644
index 00000000000..1ae4cfcaa7c
--- /dev/null
+++ b/test/wpt/tests/fetch/corb/img-png-mislabeled-as-html.sub.html
@@ -0,0 +1,10 @@
+<!DOCTYPE html>
+<!-- Test verifies that CORB won't block an image after sniffing determines
+  that the text/html Content-Type response header doesn't match the response
+  body.
+-->
+<meta charset="utf-8">
+<!-- Reference page uses same-origin resources, which are not CORB-eligible. -->
+<link rel="match" href="img-png-mislabeled-as-html.sub-ref.html">
+<!-- www1 is cross-origin, so the HTTP response is CORB-eligible -->
+<img src="http://{{domains[www1]}}:{{ports[http][0]}}/fetch/corb/resources/png-mislabeled-as-html.png">
diff --git a/test/wpt/tests/fetch/corb/img-svg-doctype-html-mimetype-empty.sub.html b/test/wpt/tests/fetch/corb/img-svg-doctype-html-mimetype-empty.sub.html
new file mode 100644
index 00000000000..3219feda171
--- /dev/null
+++ b/test/wpt/tests/fetch/corb/img-svg-doctype-html-mimetype-empty.sub.html
@@ -0,0 +1,7 @@
+<!DOCTYPE html>
+<!-- Verifies CORB/ORB SVG image blocking.
+  This image has no MIME type and an html DOCTYPE declaration and is
+  expected to be blocked-->
+<meta charset="utf-8">
+<link rel="match" href="img-svg-invalid.sub-ref.html">
+<img src="http://{{domains[www1]}}:{{ports[http][0]}}/fetch/corb/resources/svg-doctype-html-mimetype-empty.svg">
diff --git a/test/wpt/tests/fetch/corb/img-svg-doctype-html-mimetype-svg.sub.html b/test/wpt/tests/fetch/corb/img-svg-doctype-html-mimetype-svg.sub.html
new file mode 100644
index 00000000000..efcfaa27374
--- /dev/null
+++ b/test/wpt/tests/fetch/corb/img-svg-doctype-html-mimetype-svg.sub.html
@@ -0,0 +1,11 @@
+<!DOCTYPE html>
+<!-- Verifies CORB/ORB SVG image blocking.
+  This image has an SVG MIME type and an html DOCTYPE declaration and is
+  expected to load.
+
+  This testcase is distilled from a bugreport and real web page. See:
+  https://crbug.com/1359788
+-->
+<meta charset="utf-8">
+<link rel="match" href="img-svg.sub-ref.html">
+<img src="http://{{domains[www1]}}:{{ports[http][0]}}/fetch/corb/resources/svg-doctype-html-mimetype-svg.svg">
diff --git a/test/wpt/tests/fetch/corb/img-svg-invalid.sub-ref.html b/test/wpt/tests/fetch/corb/img-svg-invalid.sub-ref.html
new file mode 100644
index 00000000000..484cd0a4fde
--- /dev/null
+++ b/test/wpt/tests/fetch/corb/img-svg-invalid.sub-ref.html
@@ -0,0 +1,5 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<!-- Same-origin, but invalid URL.
+  Serves as reference for tests that expect the image to be blocked. -->
+<img src="resources/invalid.svg">
diff --git a/test/wpt/tests/fetch/corb/img-svg-labeled-as-dash.sub.html b/test/wpt/tests/fetch/corb/img-svg-labeled-as-dash.sub.html
new file mode 100644
index 00000000000..0578b835fe5
--- /dev/null
+++ b/test/wpt/tests/fetch/corb/img-svg-labeled-as-dash.sub.html
@@ -0,0 +1,6 @@
+<!DOCTYPE html>
+<!-- Verifies CORB/ORB SVG image blocking.
+  This image is served with a DASH MIME type, and is expected to be blocked. -->
+<meta charset="utf-8">
+<link rel="match" href="img-svg-invalid.sub-ref.html">
+<img src="http://{{domains[www1]}}:{{ports[http][0]}}/fetch/corb/resources/svg-labeled-as-dash.svg">
diff --git a/test/wpt/tests/fetch/corb/img-svg-labeled-as-svg-xml.sub.html b/test/wpt/tests/fetch/corb/img-svg-labeled-as-svg-xml.sub.html
new file mode 100644
index 00000000000..30a2eb3246c
--- /dev/null
+++ b/test/wpt/tests/fetch/corb/img-svg-labeled-as-svg-xml.sub.html
@@ -0,0 +1,6 @@
+<!DOCTYPE html>
+<!-- Verifies CORB/ORB SVG image blocking.
+  This image is served with a proper SVG MIME type and is expected to load. -->
+<meta charset="utf-8">
+<link rel="match" href="img-svg.sub-ref.html">
+<img src="http://{{domains[www1]}}:{{ports[http][0]}}/fetch/corb/resources/svg-labeled-as-svg-xml.svg">
diff --git a/test/wpt/tests/fetch/corb/img-svg-xml-decl.sub.html b/test/wpt/tests/fetch/corb/img-svg-xml-decl.sub.html
new file mode 100644
index 00000000000..0d3aeafb258
--- /dev/null
+++ b/test/wpt/tests/fetch/corb/img-svg-xml-decl.sub.html
@@ -0,0 +1,6 @@
+<!DOCTYPE html>
+<!-- Verifies CORB/ORB SVG image blocking.
+  This image has an XML declaration and is expected to load. -->
+<meta charset="utf-8">
+<link rel="match" href="img-svg.sub-ref.html">
+<img src="http://{{domains[www1]}}:{{ports[http][0]}}/fetch/corb/resources/svg-xml-decl.svg">
diff --git a/test/wpt/tests/fetch/corb/img-svg.sub-ref.html b/test/wpt/tests/fetch/corb/img-svg.sub-ref.html
new file mode 100644
index 00000000000..5462f685a0e
--- /dev/null
+++ b/test/wpt/tests/fetch/corb/img-svg.sub-ref.html
@@ -0,0 +1,5 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<!-- Same-origin, so the HTTP response is not CORB-eligible.
+     Serves as reference for cases the image is expected to be loaded. -->
+<img src="resources/svg.svg">
diff --git a/test/wpt/tests/fetch/corb/preload-image-png-mislabeled-as-html-nosniff.tentative.sub.html b/test/wpt/tests/fetch/corb/preload-image-png-mislabeled-as-html-nosniff.tentative.sub.html
new file mode 100644
index 00000000000..cea80f2f89f
--- /dev/null
+++ b/test/wpt/tests/fetch/corb/preload-image-png-mislabeled-as-html-nosniff.tentative.sub.html
@@ -0,0 +1,24 @@
+<!DOCTYPE html>
+<!-- This test verifies observable CORB impact on <link rel="preload"> elements.
+-->
+<meta charset="utf-8">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<div id=log></div>
+
+<script>
+async_test(function(t) {
+  // With CORB the link.onerror event will be reached
+  // (because CORB will block the cross-origin preload).
+  window.preloadErrorEvent = t.step_func_done();
+
+  // Without CORB the link.onload event will be reached.
+  window.preloadLoadEvent = t.unreached_func("link/preload onload event reached.");
+});
+</script>
+
+<!-- www1 is cross-origin, so the HTTP response is CORB-eligible -->
+<link rel="preload" as="image"
+      onerror="window.preloadErrorEvent()"
+      onload="window.preloadLoadEvent()"
+      href="http://{{domains[www1]}}:{{ports[http][0]}}/fetch/corb/resources/png-mislabeled-as-html-nosniff.png">
diff --git a/test/wpt/tests/fetch/corb/resources/css-mislabeled-as-html-nosniff.css b/test/wpt/tests/fetch/corb/resources/css-mislabeled-as-html-nosniff.css
new file mode 100644
index 00000000000..afd2b92975d
--- /dev/null
+++ b/test/wpt/tests/fetch/corb/resources/css-mislabeled-as-html-nosniff.css
@@ -0,0 +1 @@
+#header { color: red; }
diff --git a/test/wpt/tests/fetch/corb/resources/css-mislabeled-as-html-nosniff.css.headers b/test/wpt/tests/fetch/corb/resources/css-mislabeled-as-html-nosniff.css.headers
new file mode 100644
index 00000000000..0f228f94ecb
--- /dev/null
+++ b/test/wpt/tests/fetch/corb/resources/css-mislabeled-as-html-nosniff.css.headers
@@ -0,0 +1,2 @@
+Content-Type: text/html
+X-Content-Type-Options: nosniff
diff --git a/test/wpt/tests/fetch/corb/resources/css-mislabeled-as-html.css b/test/wpt/tests/fetch/corb/resources/css-mislabeled-as-html.css
new file mode 100644
index 00000000000..afd2b92975d
--- /dev/null
+++ b/test/wpt/tests/fetch/corb/resources/css-mislabeled-as-html.css
@@ -0,0 +1 @@
+#header { color: red; }
diff --git a/test/wpt/tests/fetch/corb/resources/css-mislabeled-as-html.css.headers b/test/wpt/tests/fetch/corb/resources/css-mislabeled-as-html.css.headers
new file mode 100644
index 00000000000..156209f9c81
--- /dev/null
+++ b/test/wpt/tests/fetch/corb/resources/css-mislabeled-as-html.css.headers
@@ -0,0 +1 @@
+Content-Type: text/html
diff --git a/test/wpt/tests/fetch/corb/resources/css-with-json-parser-breaker.css b/test/wpt/tests/fetch/corb/resources/css-with-json-parser-breaker.css
new file mode 100644
index 00000000000..7db6f5c6d36
--- /dev/null
+++ b/test/wpt/tests/fetch/corb/resources/css-with-json-parser-breaker.css
@@ -0,0 +1,3 @@
+)]}'
+{}
+#header { color: red; }
diff --git a/test/wpt/tests/fetch/corb/resources/empty-labeled-as-png.png b/test/wpt/tests/fetch/corb/resources/empty-labeled-as-png.png
new file mode 100644
index 00000000000..e69de29bb2d
diff --git a/test/wpt/tests/fetch/corb/resources/empty-labeled-as-png.png.headers b/test/wpt/tests/fetch/corb/resources/empty-labeled-as-png.png.headers
new file mode 100644
index 00000000000..e7be84a714b
--- /dev/null
+++ b/test/wpt/tests/fetch/corb/resources/empty-labeled-as-png.png.headers
@@ -0,0 +1 @@
+Content-Type: image/png
diff --git a/test/wpt/tests/fetch/corb/resources/html-correctly-labeled.html b/test/wpt/tests/fetch/corb/resources/html-correctly-labeled.html
new file mode 100644
index 00000000000..7bad71bfbd8
--- /dev/null
+++ b/test/wpt/tests/fetch/corb/resources/html-correctly-labeled.html
@@ -0,0 +1,10 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>Page Title</title>
+  </head>
+  <body>
+    <p>Page body</p>
+  </body>
+</html>
diff --git a/test/wpt/tests/fetch/corb/resources/html-correctly-labeled.html.headers b/test/wpt/tests/fetch/corb/resources/html-correctly-labeled.html.headers
new file mode 100644
index 00000000000..156209f9c81
--- /dev/null
+++ b/test/wpt/tests/fetch/corb/resources/html-correctly-labeled.html.headers
@@ -0,0 +1 @@
+Content-Type: text/html
diff --git a/test/wpt/tests/fetch/corb/resources/html-js-polyglot.js b/test/wpt/tests/fetch/corb/resources/html-js-polyglot.js
new file mode 100644
index 00000000000..db45bb4acc9
--- /dev/null
+++ b/test/wpt/tests/fetch/corb/resources/html-js-polyglot.js
@@ -0,0 +1,9 @@
+<!--/*--><html><body><script type="text/javascript"><!--//*/
+
+// This is a regression test for https://crbug.com/839425
+// which found out that some script resources are served
+// with text/html content-type and with a body that is
+// both a valid html and a valid javascript.
+window['html-js-polyglot.js'] = true;
+
+//--></script></body></html>
diff --git a/test/wpt/tests/fetch/corb/resources/html-js-polyglot.js.headers b/test/wpt/tests/fetch/corb/resources/html-js-polyglot.js.headers
new file mode 100644
index 00000000000..156209f9c81
--- /dev/null
+++ b/test/wpt/tests/fetch/corb/resources/html-js-polyglot.js.headers
@@ -0,0 +1 @@
+Content-Type: text/html
diff --git a/test/wpt/tests/fetch/corb/resources/html-js-polyglot2.js b/test/wpt/tests/fetch/corb/resources/html-js-polyglot2.js
new file mode 100644
index 00000000000..faae1b7682b
--- /dev/null
+++ b/test/wpt/tests/fetch/corb/resources/html-js-polyglot2.js
@@ -0,0 +1,10 @@
+<!-- comment --> <script type='text/javascript'>
+//<![CDATA[
+
+// This is a regression test for https://crbug.com/839945
+// which found out that some script resources are served
+// with text/html content-type and with a body that is
+// both a valid html and a valid javascript.
+window['html-js-polyglot2.js'] = true;
+
+//]]>--></script>
diff --git a/test/wpt/tests/fetch/corb/resources/html-js-polyglot2.js.headers b/test/wpt/tests/fetch/corb/resources/html-js-polyglot2.js.headers
new file mode 100644
index 00000000000..156209f9c81
--- /dev/null
+++ b/test/wpt/tests/fetch/corb/resources/html-js-polyglot2.js.headers
@@ -0,0 +1 @@
+Content-Type: text/html
diff --git a/test/wpt/tests/fetch/corb/resources/js-mislabeled-as-html-nosniff.js b/test/wpt/tests/fetch/corb/resources/js-mislabeled-as-html-nosniff.js
new file mode 100644
index 00000000000..a880a5bc724
--- /dev/null
+++ b/test/wpt/tests/fetch/corb/resources/js-mislabeled-as-html-nosniff.js
@@ -0,0 +1 @@
+window.has_executed_script = true;
diff --git a/test/wpt/tests/fetch/corb/resources/js-mislabeled-as-html-nosniff.js.headers b/test/wpt/tests/fetch/corb/resources/js-mislabeled-as-html-nosniff.js.headers
new file mode 100644
index 00000000000..0f228f94ecb
--- /dev/null
+++ b/test/wpt/tests/fetch/corb/resources/js-mislabeled-as-html-nosniff.js.headers
@@ -0,0 +1,2 @@
+Content-Type: text/html
+X-Content-Type-Options: nosniff
diff --git a/test/wpt/tests/fetch/corb/resources/js-mislabeled-as-html.js b/test/wpt/tests/fetch/corb/resources/js-mislabeled-as-html.js
new file mode 100644
index 00000000000..a880a5bc724
--- /dev/null
+++ b/test/wpt/tests/fetch/corb/resources/js-mislabeled-as-html.js
@@ -0,0 +1 @@
+window.has_executed_script = true;
diff --git a/test/wpt/tests/fetch/corb/resources/js-mislabeled-as-html.js.headers b/test/wpt/tests/fetch/corb/resources/js-mislabeled-as-html.js.headers
new file mode 100644
index 00000000000..156209f9c81
--- /dev/null
+++ b/test/wpt/tests/fetch/corb/resources/js-mislabeled-as-html.js.headers
@@ -0,0 +1 @@
+Content-Type: text/html
diff --git a/test/wpt/tests/fetch/corb/resources/png-correctly-labeled.png b/test/wpt/tests/fetch/corb/resources/png-correctly-labeled.png
new file mode 100644
index 00000000000..820f8cace21
Binary files /dev/null and b/test/wpt/tests/fetch/corb/resources/png-correctly-labeled.png differ
diff --git a/test/wpt/tests/fetch/corb/resources/png-correctly-labeled.png.headers b/test/wpt/tests/fetch/corb/resources/png-correctly-labeled.png.headers
new file mode 100644
index 00000000000..e7be84a714b
--- /dev/null
+++ b/test/wpt/tests/fetch/corb/resources/png-correctly-labeled.png.headers
@@ -0,0 +1 @@
+Content-Type: image/png
diff --git a/test/wpt/tests/fetch/corb/resources/png-mislabeled-as-html-nosniff.png b/test/wpt/tests/fetch/corb/resources/png-mislabeled-as-html-nosniff.png
new file mode 100644
index 00000000000..820f8cace21
Binary files /dev/null and b/test/wpt/tests/fetch/corb/resources/png-mislabeled-as-html-nosniff.png differ
diff --git a/test/wpt/tests/fetch/corb/resources/png-mislabeled-as-html-nosniff.png.headers b/test/wpt/tests/fetch/corb/resources/png-mislabeled-as-html-nosniff.png.headers
new file mode 100644
index 00000000000..0f228f94ecb
--- /dev/null
+++ b/test/wpt/tests/fetch/corb/resources/png-mislabeled-as-html-nosniff.png.headers
@@ -0,0 +1,2 @@
+Content-Type: text/html
+X-Content-Type-Options: nosniff
diff --git a/test/wpt/tests/fetch/corb/resources/png-mislabeled-as-html.png b/test/wpt/tests/fetch/corb/resources/png-mislabeled-as-html.png
new file mode 100644
index 00000000000..820f8cace21
Binary files /dev/null and b/test/wpt/tests/fetch/corb/resources/png-mislabeled-as-html.png differ
diff --git a/test/wpt/tests/fetch/corb/resources/png-mislabeled-as-html.png.headers b/test/wpt/tests/fetch/corb/resources/png-mislabeled-as-html.png.headers
new file mode 100644
index 00000000000..156209f9c81
--- /dev/null
+++ b/test/wpt/tests/fetch/corb/resources/png-mislabeled-as-html.png.headers
@@ -0,0 +1 @@
+Content-Type: text/html
diff --git a/test/wpt/tests/fetch/corb/resources/response_block_probe.js b/test/wpt/tests/fetch/corb/resources/response_block_probe.js
new file mode 100644
index 00000000000..d23ad488af2
--- /dev/null
+++ b/test/wpt/tests/fetch/corb/resources/response_block_probe.js
@@ -0,0 +1 @@
+window.script_callback();
diff --git a/test/wpt/tests/fetch/corb/resources/response_block_probe.js.headers b/test/wpt/tests/fetch/corb/resources/response_block_probe.js.headers
new file mode 100644
index 00000000000..0d848b02c2e
--- /dev/null
+++ b/test/wpt/tests/fetch/corb/resources/response_block_probe.js.headers
@@ -0,0 +1 @@
+Content-Type: text/csv
diff --git a/test/wpt/tests/fetch/corb/resources/sniffable-resource.py b/test/wpt/tests/fetch/corb/resources/sniffable-resource.py
new file mode 100644
index 00000000000..f8150936acb
--- /dev/null
+++ b/test/wpt/tests/fetch/corb/resources/sniffable-resource.py
@@ -0,0 +1,11 @@
+def main(request, response):
+    body = request.GET.first(b"body", None)
+    type = request.GET.first(b"type", None)
+
+    response.add_required_headers = False
+    response.writer.write_status(200)
+    response.writer.write_header(b"content-length", len(body))
+    response.writer.write_header(b"content-type", type)
+    response.writer.end_headers()
+
+    response.writer.write(body)
diff --git a/test/wpt/tests/fetch/corb/resources/subframe-that-posts-html-containing-blob-url-to-parent.html b/test/wpt/tests/fetch/corb/resources/subframe-that-posts-html-containing-blob-url-to-parent.html
new file mode 100644
index 00000000000..67b3ad5a600
--- /dev/null
+++ b/test/wpt/tests/fetch/corb/resources/subframe-that-posts-html-containing-blob-url-to-parent.html
@@ -0,0 +1,16 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<script>
+fetch('html-correctly-labeled.html')
+    .then(response => response.blob())
+    .then(blob => {
+        let msg = { blob_size: blob.size,
+                    blob_type: blob.type,
+                    blob_url: URL.createObjectURL(blob) };
+        window.parent.postMessage(msg, '*');
+    })
+    .catch(error => {
+        let msg = { error: error };
+        window.parent.postMessage(msg, '*');
+    });
+</script>
diff --git a/test/wpt/tests/fetch/corb/resources/svg-doctype-html-mimetype-empty.svg b/test/wpt/tests/fetch/corb/resources/svg-doctype-html-mimetype-empty.svg
new file mode 100644
index 00000000000..fa2d29b3b0f
--- /dev/null
+++ b/test/wpt/tests/fetch/corb/resources/svg-doctype-html-mimetype-empty.svg
@@ -0,0 +1,4 @@
+<!DOCTYPE html>
+<svg width="920" height="625" xmlns="http://www.w3.org/2000/svg" role="img">
+<rect width="100" height="100" style="fill:rgb(255,0,0)"/>
+</svg>
diff --git a/test/wpt/tests/fetch/corb/resources/svg-doctype-html-mimetype-empty.svg.headers b/test/wpt/tests/fetch/corb/resources/svg-doctype-html-mimetype-empty.svg.headers
new file mode 100644
index 00000000000..29515ee7d4a
--- /dev/null
+++ b/test/wpt/tests/fetch/corb/resources/svg-doctype-html-mimetype-empty.svg.headers
@@ -0,0 +1 @@
+Content-Type:
diff --git a/test/wpt/tests/fetch/corb/resources/svg-doctype-html-mimetype-svg.svg b/test/wpt/tests/fetch/corb/resources/svg-doctype-html-mimetype-svg.svg
new file mode 100644
index 00000000000..fa2d29b3b0f
--- /dev/null
+++ b/test/wpt/tests/fetch/corb/resources/svg-doctype-html-mimetype-svg.svg
@@ -0,0 +1,4 @@
+<!DOCTYPE html>
+<svg width="920" height="625" xmlns="http://www.w3.org/2000/svg" role="img">
+<rect width="100" height="100" style="fill:rgb(255,0,0)"/>
+</svg>
diff --git a/test/wpt/tests/fetch/corb/resources/svg-doctype-html-mimetype-svg.svg.headers b/test/wpt/tests/fetch/corb/resources/svg-doctype-html-mimetype-svg.svg.headers
new file mode 100644
index 00000000000..070de35fbe9
--- /dev/null
+++ b/test/wpt/tests/fetch/corb/resources/svg-doctype-html-mimetype-svg.svg.headers
@@ -0,0 +1 @@
+Content-Type: image/svg+xml
diff --git a/test/wpt/tests/fetch/corb/resources/svg-labeled-as-dash.svg b/test/wpt/tests/fetch/corb/resources/svg-labeled-as-dash.svg
new file mode 100644
index 00000000000..2b7d1016b1e
--- /dev/null
+++ b/test/wpt/tests/fetch/corb/resources/svg-labeled-as-dash.svg
@@ -0,0 +1,3 @@
+<svg width="920" height="625" xmlns="http://www.w3.org/2000/svg" role="img">
+<rect width="100" height="100" style="fill:rgb(255,0,0)"/>
+</svg>
diff --git a/test/wpt/tests/fetch/corb/resources/svg-labeled-as-dash.svg.headers b/test/wpt/tests/fetch/corb/resources/svg-labeled-as-dash.svg.headers
new file mode 100644
index 00000000000..43ce612c9fd
--- /dev/null
+++ b/test/wpt/tests/fetch/corb/resources/svg-labeled-as-dash.svg.headers
@@ -0,0 +1 @@
+Content-Type: application/dash+xml
diff --git a/test/wpt/tests/fetch/corb/resources/svg-labeled-as-svg-xml.svg b/test/wpt/tests/fetch/corb/resources/svg-labeled-as-svg-xml.svg
new file mode 100644
index 00000000000..2b7d1016b1e
--- /dev/null
+++ b/test/wpt/tests/fetch/corb/resources/svg-labeled-as-svg-xml.svg
@@ -0,0 +1,3 @@
+<svg width="920" height="625" xmlns="http://www.w3.org/2000/svg" role="img">
+<rect width="100" height="100" style="fill:rgb(255,0,0)"/>
+</svg>
diff --git a/test/wpt/tests/fetch/corb/resources/svg-labeled-as-svg-xml.svg.headers b/test/wpt/tests/fetch/corb/resources/svg-labeled-as-svg-xml.svg.headers
new file mode 100644
index 00000000000..070de35fbe9
--- /dev/null
+++ b/test/wpt/tests/fetch/corb/resources/svg-labeled-as-svg-xml.svg.headers
@@ -0,0 +1 @@
+Content-Type: image/svg+xml
diff --git a/test/wpt/tests/fetch/corb/resources/svg-xml-decl.svg b/test/wpt/tests/fetch/corb/resources/svg-xml-decl.svg
new file mode 100644
index 00000000000..3b39aff8e5c
--- /dev/null
+++ b/test/wpt/tests/fetch/corb/resources/svg-xml-decl.svg
@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
+<svg width="920" height="625" xmlns="http://www.w3.org/2000/svg" role="img">
+<rect width="100" height="100" style="fill:rgb(255,0,0)"/>
+</svg>
diff --git a/test/wpt/tests/fetch/corb/resources/svg.svg b/test/wpt/tests/fetch/corb/resources/svg.svg
new file mode 100644
index 00000000000..2b7d1016b1e
--- /dev/null
+++ b/test/wpt/tests/fetch/corb/resources/svg.svg
@@ -0,0 +1,3 @@
+<svg width="920" height="625" xmlns="http://www.w3.org/2000/svg" role="img">
+<rect width="100" height="100" style="fill:rgb(255,0,0)"/>
+</svg>
diff --git a/test/wpt/tests/fetch/corb/resources/svg.svg.headers b/test/wpt/tests/fetch/corb/resources/svg.svg.headers
new file mode 100644
index 00000000000..070de35fbe9
--- /dev/null
+++ b/test/wpt/tests/fetch/corb/resources/svg.svg.headers
@@ -0,0 +1 @@
+Content-Type: image/svg+xml
diff --git a/test/wpt/tests/fetch/corb/response_block.tentative.sub.https.html b/test/wpt/tests/fetch/corb/response_block.tentative.sub.https.html
new file mode 100644
index 00000000000..860e0d3b93c
--- /dev/null
+++ b/test/wpt/tests/fetch/corb/response_block.tentative.sub.https.html
@@ -0,0 +1,44 @@
+<!DOCTYPE html>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<body>
+<script>
+// Test handling of blocked responses in CORB/ORB.
+function probe() {
+  // We will cross-origin load a script resource that should get blocked by all
+  // versions of CORB/ORB. Three things may happen:
+  //
+  // 1, The script might execute. (CORB/ORB not supported. Or a bug.)
+  // 2, An empty response is injected: The script loads but nothing is executed.
+  //    (Expected behaviour for CORB and "ORB v0.1".)
+  // 3, An error is injected and script loading aborts. (Expected for ORB.)
+
+  // A cross-origin response labelled as text/csv, which will call
+  // script_callback when executed.
+  const probe = "https://{{domains[www1]}}:{{ports[https][0]}}" +
+      "/fetch/corb/resources/response_block_probe.js";
+
+  // Load the probe as a script.
+  const script = document.createElement("script");
+  script.src = probe;
+  document.body.appendChild(script);
+
+  // Return a promise that will return a string description corresponding to the
+  // three conditions above. Not that a script_callback call is processed
+  // synchronously and hence will occur before the onload event is dispatched.
+  return new Promise((resolve, reject) => {
+    script.onload = _ => resolve("script loaded");
+    script.onerror = _ => resolve("script errored");
+    window.script_callback = _ => resolve("script executed");
+  });
+}
+
+promise_test(t => probe().then(
+    value => assert_equals(value, "script errored")),
+    "ORB: Expect error response.");
+
+// This test ensures we're _not_ seeing CORB behaviour.
+promise_test(t => probe().then(
+    value => assert_not_equals(value, "script loaded")),
+    "!CORB: CORB would have expected an empty response.");
+</script>
diff --git a/test/wpt/tests/fetch/corb/script-html-correctly-labeled.tentative.sub.html b/test/wpt/tests/fetch/corb/script-html-correctly-labeled.tentative.sub.html
new file mode 100644
index 00000000000..6d1947cea7d
--- /dev/null
+++ b/test/wpt/tests/fetch/corb/script-html-correctly-labeled.tentative.sub.html
@@ -0,0 +1,32 @@
+<!DOCTYPE html>
+<!-- Test verifies that html fed to a <script> tag won't report a syntax
+  error after CORB blocks the response (an empty response body injected
+  by CORB won't have any JavaScript syntax errors).
+-->
+<meta charset="utf-8">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<div id=log></div>
+<script>
+setup({allow_uncaught_exception : true});
+async_test(function(t) {
+  var script = document.createElement("script")
+
+  // Without CORB, the html document would cause a syntax error when parsed as
+  // JavaScript, but with CORB there should be no errors (because CORB will
+  // replace the response body with an empty body). With ORB, the script loading
+  // itself will error out.
+  script.onload = t.step_func_done();
+  script.onerror = t.step_func_done();
+  addEventListener("error",function(e) {
+    t.step(function() {
+      assert_unreached("Empty body of a CORB-blocked response shouldn't trigger syntax errors.");
+      t.done();
+    })
+  });
+
+  // www1 is cross-origin, so the HTTP response is CORB-eligible.
+  script.src = 'http://{{domains[www1]}}:{{ports[http][0]}}/fetch/corb/resources/html-correctly-labeled.html';
+  document.body.appendChild(script)
+}, "CORB-blocked script has no syntax errors");
+</script>
diff --git a/test/wpt/tests/fetch/corb/script-html-js-polyglot.sub.html b/test/wpt/tests/fetch/corb/script-html-js-polyglot.sub.html
new file mode 100644
index 00000000000..9a272d63ffc
--- /dev/null
+++ b/test/wpt/tests/fetch/corb/script-html-js-polyglot.sub.html
@@ -0,0 +1,32 @@
+<!DOCTYPE html>
+<!-- Test verifies that CORB won't block a polyglot script that is
+     both a valid HTML document and also valid Javascript.
+-->
+<meta charset="utf-8">
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<div id=log></div>
+<script>
+["html-js-polyglot.js", "html-js-polyglot2.js"].forEach(polyglot_name => {
+  async_test(function(t) {
+    window[polyglot_name] = false;
+    var script = document.createElement("script");
+
+    script.onload = t.step_func_done(function(){
+      // Verify that the script response wasn't blocked - that script
+      // should have set window[polyglot_name] to true.
+      assert_true(window[polyglot_name]);
+    })
+    addEventListener("error",function(e) {
+      t.step(function() {
+        assert_unreached("No errors are expected with or without CORB.");
+        t.done();
+      })
+    });
+
+    // www1 is cross-origin, so the HTTP response is CORB-eligible.
+    script.src = "http://{{domains[www1]}}:{{ports[http][0]}}/fetch/corb/resources/" + polyglot_name;
+    document.body.appendChild(script);
+  }, "CORB cannot block polyglot HTML/JS: " + polyglot_name);
+});
+</script>
diff --git a/test/wpt/tests/fetch/corb/script-html-via-cross-origin-blob-url.sub.html b/test/wpt/tests/fetch/corb/script-html-via-cross-origin-blob-url.sub.html
new file mode 100644
index 00000000000..c8a90c79b3f
--- /dev/null
+++ b/test/wpt/tests/fetch/corb/script-html-via-cross-origin-blob-url.sub.html
@@ -0,0 +1,38 @@
+<!DOCTYPE html>
+<!-- Test verifies that cross-origin blob URIs are blocked both with and
+  without CORB.
+-->
+<meta charset="utf-8">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<div id=log></div>
+<script>
+async_test(function(t) {
+  function step1_createSubframe() {
+    addEventListener("message", function(e) {
+      t.step(function() { step2_processSubframeMsg(e.data); })
+    });
+    var subframe = document.createElement("iframe")
+    // www1 is cross-origin, to ensure that the received blob will be cross-origin.
+    subframe.src = 'http://{{domains[www1]}}:{{ports[http][0]}}/fetch/corb/resources/subframe-that-posts-html-containing-blob-url-to-parent.html';
+    document.body.appendChild(subframe);
+  }
+
+  function step2_processSubframeMsg(msg) {
+    assert_false(msg.hasOwnProperty('error'), 'unexpected property found: "error"');
+    assert_equals(msg.blob_type, 'text/html');
+    assert_equals(msg.blob_size, 147);
+
+    // With and without CORB loading of a cross-origin blob should be blocked
+    // (this is verified by expecting |script.onerror|, but not |script.onload|
+    // below).
+    var script = document.createElement("script")
+    script.src = msg.blob_url;
+    script.onerror = t.step_func_done(function(){})
+    script.onload = t.unreached_func("Unexpected load event")
+    document.body.appendChild(script)
+  }
+
+  step1_createSubframe();
+});
+</script>
diff --git a/test/wpt/tests/fetch/corb/script-js-mislabeled-as-html-nosniff.sub.html b/test/wpt/tests/fetch/corb/script-js-mislabeled-as-html-nosniff.sub.html
new file mode 100644
index 00000000000..b6bc90964de
--- /dev/null
+++ b/test/wpt/tests/fetch/corb/script-js-mislabeled-as-html-nosniff.sub.html
@@ -0,0 +1,33 @@
+<!DOCTYPE html>
+<!-- Test verifies that script mislabeled as html won't execute with and without CORB
+  if the nosniff response header is present.
+
+  The expected behavior is covered by the Fetch spec at
+  https://fetch.spec.whatwg.org/#should-response-to-request-be-blocked-due-to-nosniff?
+
+  See also the following tests:
+  - fetch/nosniff/importscripts.html
+  - fetch/nosniff/script.html
+  - fetch/nosniff/worker.html
+-->
+<meta charset="utf-8">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<div id=log></div>
+
+<script>
+setup({ single_test: true });
+window.has_executed_script = false;
+</script>
+
+<!-- www1 is cross-origin, so the HTTP response is CORB-eligible -->
+<script src="http://{{domains[www1]}}:{{ports[http][0]}}/fetch/corb/resources/js-mislabeled-as-html-nosniff.js">
+</script>
+
+<script>
+// Verify what observable effects the <script> tag above had.
+// Assertion should hold with and without CORB:
+assert_false(window.has_executed_script,
+             'The cross-origin script should not be executed');
+done();
+</script>
diff --git a/test/wpt/tests/fetch/corb/script-js-mislabeled-as-html.sub.html b/test/wpt/tests/fetch/corb/script-js-mislabeled-as-html.sub.html
new file mode 100644
index 00000000000..44cb1f8659d
--- /dev/null
+++ b/test/wpt/tests/fetch/corb/script-js-mislabeled-as-html.sub.html
@@ -0,0 +1,25 @@
+<!DOCTYPE html>
+<!-- Test verifies that script mislabeled as html will execute with and without
+  CORB (CORB should allow the script after sniffing).
+-->
+<meta charset="utf-8">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<div id=log></div>
+
+<script>
+setup({ single_test: true });
+window.has_executed_script = false;
+</script>
+
+<!-- www1 is cross-origin, so the HTTP response is CORB-eligible -->
+<script src="http://{{domains[www1]}}:{{ports[http][0]}}/fetch/corb/resources/js-mislabeled-as-html.js">
+</script>
+
+<script>
+// Verify what observable effects the <script> tag above had.
+// Assertion should hold with and without CORB:
+assert_true(window.has_executed_script,
+            'The cross-origin script should execute');
+done();
+</script>
diff --git a/test/wpt/tests/fetch/corb/script-resource-with-json-parser-breaker.tentative.sub.html b/test/wpt/tests/fetch/corb/script-resource-with-json-parser-breaker.tentative.sub.html
new file mode 100644
index 00000000000..f0eb1f0ab1f
--- /dev/null
+++ b/test/wpt/tests/fetch/corb/script-resource-with-json-parser-breaker.tentative.sub.html
@@ -0,0 +1,85 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<!-- Test verifies CORB will block responses beginning with a JSON parser
+  breaker regardless of their MIME type (excluding text/css - see below).
+
+  A JSON parser breaker is a prefix added to resources with sensitive data to
+  prevent cross-site script inclusion (XSSI) and similar attacks.  For example,
+  it may be included in JSON files to prevent them from leaking data via a
+  <script> tag, making the response only useful to a fetch or XmlHttpRequest.
+  See also https://chromium.googlesource.com/chromium/src/+/main/services/network/cross_origin_read_blocking_explainer.md#Protecting-JSON
+
+  The assumption is that all images, other media, scripts, fonts and other
+  resources that may be embedded cross-origin will never begin with a JSON
+  parser breaker.  For example an JPEG image should always being with FF D8 FF,
+  a PNG image with 89 50 4E 47 0D 0A 1A 0A bytes and an SVG image with "<?xml"
+  substring.
+
+  The assumption above excludes text/css which (as shown by
+  style-css-with-json-parser-breaker.sub.html) can parse as valid stylesheet
+  even in presence of a JSON parser breaker.
+-->
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<div id=log></div>
+<script>
+setup({allow_uncaught_exception : true});
+
+// A subset of JSON security prefixes (only ones that are parser breakers).
+json_parser_breakers = [
+  ")]}'",
+  "{}&&",
+  "{} &&",
+]
+
+// JSON parser breaker should trigger CORB blocking for any Content-Type - even
+// for resources that claim to be of a MIME type that is normally allowed to be
+// embedded in cross-origin documents (like images and/or scripts).
+mime_types = [
+  // CORB-protected MIME types
+  "text/html",
+  "text/xml",
+  "text/json",
+  "text/plain",
+
+  // MIME types that normally are allowed by CORB.
+  "application/javascript",
+  "image/png",
+  "image/svg+xml",
+
+  // Other types.
+  "application/pdf",
+  "application/zip",
+]
+
+function test(mime_type, body) {
+  // The test below depends on a global/shared event handler - we need to ensure
+  // that no tests run in parallel - this is achieved by using `promise_test`
+  // instead of `async_test`.  See also
+  // https://web-platform-tests.org/writing-tests/testharness-api.html#promise-tests
+  promise_test(t => new Promise(function(resolve, reject) {
+    var script = document.createElement("script")
+
+    // Without CORB, the JSON parser breaker would cause a syntax error when
+    // parsed as JavaScript, but with CORB there should be no errors (because
+    // CORB will replace the response body with an empty body). With ORB,
+    // the script loading itself should error out.
+    script.onload = resolve;
+    script.onerror = resolve;
+    addEventListener("error", t.unreached_func(
+        "Empty body of a CORS-blocked response shouldn't trigger syntax errors."))
+
+    // www1 is cross-origin, so the HTTP response is CORB-eligible.
+    var src_prefix = "http://{{domains[www1]}}:{{ports[http][0]}}/fetch/corb/resources/sniffable-resource.py";
+    script.src = src_prefix + "?type=" + mime_type + "&body=" + encodeURIComponent(body);
+    document.body.appendChild(script)
+  }), "CORB-blocks '" + mime_type + "' that starts with the following JSON parser breaker: " + body);
+}
+
+mime_types.forEach(function(type) {
+    json_parser_breakers.forEach(function(body) {
+        test(type, body);
+    });
+});
+
+</script>
diff --git a/test/wpt/tests/fetch/corb/script-resource-with-nonsniffable-types.tentative.sub.html b/test/wpt/tests/fetch/corb/script-resource-with-nonsniffable-types.tentative.sub.html
new file mode 100644
index 00000000000..6d490d55bce
--- /dev/null
+++ b/test/wpt/tests/fetch/corb/script-resource-with-nonsniffable-types.tentative.sub.html
@@ -0,0 +1,84 @@
+<!DOCTYPE html>
+<!-- Test verifies CORB will block responses with types that do not
+  require confirmation sniffing.
+
+  We assume that:
+  1) it is unlikely that images, other media, scripts, etc. will be mislabelled
+     as the |protected_mime_types| below,
+  2) the |protected_mime_types| below are likely to contain sensitive,
+     credentialled data.
+-->
+<meta charset="utf-8">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/common/utils.js"></script>
+<div id=log></div>
+<script>
+setup({allow_uncaught_exception : true, single_test : true});
+
+function test(mime_type, is_blocking_expected) {
+  var action = is_blocking_expected ? "blocks" : "does not block";
+
+  async_test(function(t) {
+    var script = document.createElement("script")
+    var script_has_run_token = "script_has_run" + token();
+
+    // With and without CORB there should be no error, but without CORB the
+    // original script body will be preserved and |window.script_has_run| will
+    // be set.
+    window[script_has_run_token] = false;
+    script.onload = t.step_func_done(function(){
+      if (is_blocking_expected) {
+        assert_false(window[script_has_run_token]);
+      } else {
+        assert_true(window[script_has_run_token]);
+      }
+    });
+    addEventListener("error",function(e) {
+      t.step(function() {
+        assert_unreached("Unexpected error: " + e);
+        t.done();
+      })
+    });
+
+    // www1 is cross-origin, so the HTTP response is CORB-eligible.
+    var src_prefix = "http://{{domains[www1]}}:{{ports[http][0]}}/fetch/corb/resources/sniffable-resource.py";
+    body = `window['${script_has_run_token}'] = true;`
+    script.src = src_prefix + "?type=" + mime_type + "&body=" + encodeURIComponent(body);
+    document.body.appendChild(script)
+  }, "CORB " + action + " '" + mime_type + "'");
+}
+
+// Some mime types should be protected by CORB without any kind
+// of confirmation sniffing.
+protected_mime_types = [
+  "application/gzip",
+  "application/pdf",
+  "application/x-gzip",
+  "application/x-protobuf",
+  "application/zip",
+  "multipart/byteranges",
+  "multipart/signed",
+  "text/csv",
+  "text/event-stream",
+]
+protected_mime_types.forEach(function(type) {
+    test(type, true /* is_blocking_expected */);
+});
+
+// Other mime types.
+other_mime_types = [
+  // These content types are legitimately allowed in 'no-cors' fetches.
+  "application/javascript",
+
+  // Confirmation sniffing will fail and prevent CORB from blocking the
+  // response.
+  "text/html",
+
+  // Unrecognized content types.
+  "application/blah"
+]
+other_mime_types.forEach(function(type) {
+    test(type, false /* is_blocking_expected */);
+});
+</script>
diff --git a/test/wpt/tests/fetch/corb/style-css-mislabeled-as-html-nosniff.sub.html b/test/wpt/tests/fetch/corb/style-css-mislabeled-as-html-nosniff.sub.html
new file mode 100644
index 00000000000..8fef0dc59e4
--- /dev/null
+++ b/test/wpt/tests/fetch/corb/style-css-mislabeled-as-html-nosniff.sub.html
@@ -0,0 +1,42 @@
+<!DOCTYPE html>
+<!-- Test verifies that a stylesheet mislabeled as html won't execute with and
+  without CORB if the nosniff response header is present.
+
+  The expected behavior is covered by the Fetch spec at
+  https://fetch.spec.whatwg.org/#should-response-to-request-be-blocked-due-to-nosniff?
+
+  See also the following tests:
+  - fetch/nosniff/stylesheet.html
+-->
+<meta charset="utf-8">
+<title>CSS is not applied (because of nosniff + non-text/css headers)</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+
+<!-- Default style that will be applied if the external stylesheet resource
+  below won't load for any reason.  This stylesheet will set h1's
+  color to green (see |default_color| below). -->
+<style>
+h1 { color: green; }
+</style>
+
+<!-- This stylesheet (if loaded) should set h1#header's color to red
+    (see |external_color| below). -->
+<!-- www1 is cross-origin, so the HTTP response is CORB-eligible -->
+<link rel="stylesheet" type="text/css"
+      href="http://{{domains[www1]}}:{{ports[http][0]}}/fetch/corb/resources/css-mislabeled-as-html-nosniff.css">
+
+<body>
+  <h1 id="header">Header example</h1>
+  <p>Paragraph body</p>
+</body>
+
+<script>
+test(() => {
+  let style = getComputedStyle(document.getElementById('header'));
+  const external_color = 'rgb(255, 0, 0)';  // red
+  const default_color = 'rgb(0, 128, 0)';  // green
+  assert_equals(style.getPropertyValue('color'), default_color);
+  assert_not_equals(style.getPropertyValue('color'), external_color);
+});
+</script>
diff --git a/test/wpt/tests/fetch/corb/style-css-mislabeled-as-html.sub.html b/test/wpt/tests/fetch/corb/style-css-mislabeled-as-html.sub.html
new file mode 100644
index 00000000000..4f0b4c22f56
--- /dev/null
+++ b/test/wpt/tests/fetch/corb/style-css-mislabeled-as-html.sub.html
@@ -0,0 +1,36 @@
+<!DOCTYPE html>
+<!-- Test verifies that CORB won't impact a cross-origin stylesheet mislabeled
+  as text/html (because even without CORB mislabeled CSS will be rejected).
+-->
+<meta charset="utf-8">
+<title>CSS is not applied (because of strict content-type enforcement for cross-origin stylesheets)</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+
+<!-- Default style that will be applied if the external stylesheet resource
+  below won't load for any reason.  This stylesheet will set h1's
+  color to green (see |default_color| below). -->
+<style>
+h1 { color: green; }
+</style>
+
+<!-- This stylesheet (if loaded) should set h1#header's color to red
+    (see |external_color| below). -->
+<!-- www1 is cross-origin, so the HTTP response is CORB-eligible -->
+<link rel="stylesheet" type="text/css"
+      href="http://{{domains[www1]}}:{{ports[http][0]}}/fetch/corb/resources/css-mislabeled-as-html.css">
+
+<body>
+  <h1 id="header">Header example</h1>
+  <p>Paragraph body</p>
+</body>
+
+<script>
+test(() => {
+  let style = getComputedStyle(document.getElementById('header'));
+  const external_color = 'rgb(255, 0, 0)';  // red
+  const default_color = 'rgb(0, 128, 0)';  // green
+  assert_equals(style.getPropertyValue('color'), default_color);
+  assert_not_equals(style.getPropertyValue('color'), external_color);
+});
+</script>
diff --git a/test/wpt/tests/fetch/corb/style-css-with-json-parser-breaker.sub.html b/test/wpt/tests/fetch/corb/style-css-with-json-parser-breaker.sub.html
new file mode 100644
index 00000000000..29ed586a4f0
--- /dev/null
+++ b/test/wpt/tests/fetch/corb/style-css-with-json-parser-breaker.sub.html
@@ -0,0 +1,38 @@
+<!DOCTYPE html>
+<!-- Test verifies that CORB won't block a stylesheet that
+     1) is correctly labeled with text/css Content-Type and parsing fine as text/css
+     2) starts with a JSON parser breaker (like )]}')
+-->
+<meta charset="utf-8">
+<title>CORB doesn't block a stylesheet that has a proper Content-Type and begins with a JSON parser breaker</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+
+<!-- Default style that will be applied if the external stylesheet resource
+  below won't load for any reason.  This stylesheet will set h1's
+  color to green (see |default_color| below). -->
+<style>
+h1 { color: green; }
+</style>
+
+<!-- This stylesheet (if loaded) should set h1#header's color to red
+    (see |external_color| below). -->
+<!-- www1 is cross-origin, so the HTTP response is CORB-eligible -->
+<link rel="stylesheet" type="text/css"
+      href="http://{{domains[www1]}}:{{ports[http][0]}}/fetch/corb/resources/css-with-json-parser-breaker.css">
+
+<body>
+  <h1 id="header">Header example</h1>
+  <p>Paragraph body</p>
+</body>
+
+<script>
+test(() => {
+  // Verify that CSS got applied / did not get blocked by CORB.
+  let style = getComputedStyle(document.getElementById('header'));
+  const external_color = 'rgb(255, 0, 0)';  // red
+  const default_color = 'rgb(0, 128, 0)';  // green
+  assert_equals(style.getPropertyValue('color'), external_color);
+  assert_not_equals(style.getPropertyValue('color'), default_color);
+});
+</script>
diff --git a/test/wpt/tests/fetch/corb/style-html-correctly-labeled.sub.html b/test/wpt/tests/fetch/corb/style-html-correctly-labeled.sub.html
new file mode 100644
index 00000000000..cdefcd2d2c9
--- /dev/null
+++ b/test/wpt/tests/fetch/corb/style-html-correctly-labeled.sub.html
@@ -0,0 +1,41 @@
+<!DOCTYPE html>
+<!-- Test verifies that using a HTML document as a stylesheet has no observable
+  differences with and without CORB:
+  - The cross-origin stylesheet requires a correct text/css Content-Type
+    and therefore won't render even without CORB.  This aspect of this test
+    is similar to the style-css-mislabeled-as-html.sub.html test.
+  - Even if the Content-Type requirements were relaxed for cross-origin stylesheets,
+    the HTML document is unlikely to parse as a stylesheet (unless a polyglot
+    HTML/CSS document is crafted as part of an attack) and therefore the
+    observable behavior should be indistinguishable from parsing the empty,
+    CORB-blocked response as a stylesheet.
+-->
+<meta charset="utf-8">
+<title>CSS is not applied (because of mismatched Content-Type header)</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+
+<!-- Default style that will be applied if the external stylesheet resource
+  below won't load for any reason.  This stylesheet will set h1's
+  color to green (see |default_color| below). -->
+<style>
+h1 { color: green; }
+</style>
+
+<!-- This is not really a stylesheet... -->
+<!-- www1 is cross-origin, so the HTTP response is CORB-eligible -->
+<link rel="stylesheet" type="text/css"
+      href="http://{{domains[www1]}}:{{ports[http][0]}}/fetch/corb/resources/html-correctly-labeled.html">
+
+<body>
+  <h1 id="header">Header example</h1>
+  <p>Paragraph body</p>
+</body>
+
+<script>
+test(() => {
+  var style = getComputedStyle(document.getElementById('header'));
+  const default_color = 'rgb(0, 128, 0)';  // green
+  assert_equals(style.getPropertyValue('color'), default_color);
+});
+</script>
diff --git a/test/wpt/tests/fetch/cross-origin-resource-policy/fetch-in-iframe.html b/test/wpt/tests/fetch/cross-origin-resource-policy/fetch-in-iframe.html
new file mode 100644
index 00000000000..cc6a3a81bcf
--- /dev/null
+++ b/test/wpt/tests/fetch/cross-origin-resource-policy/fetch-in-iframe.html
@@ -0,0 +1,67 @@
+<!DOCTYPE html>
+<html>
+<head>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <script src="/common/get-host-info.sub.js"></script>
+</head>
+<body>
+    <script>
+const host = get_host_info();
+const remoteBaseURL = host.HTTP_REMOTE_ORIGIN + window.location.pathname.replace(/\/[^\/]*$/, '/') ;
+const notSameSiteBaseURL = host.HTTP_NOTSAMESITE_ORIGIN + window.location.pathname.replace(/\/[^\/]*$/, '/') ;
+const localBaseURL = host.HTTP_ORIGIN + window.location.pathname.replace(/\/[^\/]*$/, '/') ;
+
+function with_iframe(url)
+{
+  return new Promise(function(resolve) {
+      var frame = document.createElement('iframe');
+      frame.src = url;
+      frame.onload = function() { resolve(frame); };
+      document.body.appendChild(frame);
+    });
+}
+
+function loadIFrameAndFetch(iframeURL, fetchURL, expectedFetchResult, title)
+{
+    promise_test(async () => {
+        const frame = await with_iframe(iframeURL);
+        let receiveMessage;
+        const promise = new Promise((resolve, reject) => {
+            receiveMessage = (event) => {
+                if (event.data !== expectedFetchResult) {
+                    reject("Received unexpected message " + event.data);
+                    return;
+                }
+                resolve();
+            }
+            window.addEventListener("message", receiveMessage, false);
+        });
+        frame.contentWindow.postMessage(fetchURL, "*");
+        return promise.finally(() => {
+            frame.remove();
+            window.removeEventListener("message", receiveMessage, false);
+        });
+    }, title);
+}
+
+// This above data URL should be equivalent to resources/iframeFetch.html
+var dataIFrameURL = "data:text/html;base64,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";
+
+loadIFrameAndFetch(dataIFrameURL, localBaseURL + "resources/hello.py?corp=same-origin", "ko",
+    "Cross-origin fetch in a data: iframe load fails if the server blocks cross-origin loads with a 'Cross-Origin-Resource-Policy: same-origin' response header.");
+
+loadIFrameAndFetch(dataIFrameURL, localBaseURL + "resources/hello.py?corp=same-site", "ko",
+    "Cross-origin fetch in a data: iframe load fails if the server blocks cross-origin loads with a 'Cross-Origin-Resource-Policy: same-site' response header.");
+
+loadIFrameAndFetch(remoteBaseURL + "resources/iframeFetch.html", localBaseURL + "resources/hello.py?corp=same-origin", "ko",
+    "Cross-origin fetch in a cross origin iframe load fails if the server blocks cross-origin loads with a 'Cross-Origin-Resource-Policy: same-origin' response header.");
+
+loadIFrameAndFetch(notSameSiteBaseURL + "resources/iframeFetch.html", localBaseURL + "resources/hello.py?corp=same-site", "ko",
+    "Cross-origin fetch in a cross origin iframe load fails if the server blocks cross-origin loads with a 'Cross-Origin-Resource-Policy: same-site' response header.");
+
+loadIFrameAndFetch(remoteBaseURL + "resources/iframeFetch.html", remoteBaseURL + "resources/hello.py?corp=same-origin", "ok",
+    "Same-origin fetch in a cross origin iframe load succeeds if the server blocks cross-origin loads with a 'Cross-Origin-Resource-Policy: same-origin' response header.");
+    </script>
+</body>
+</html>
diff --git a/test/wpt/tests/fetch/cross-origin-resource-policy/fetch.any.js b/test/wpt/tests/fetch/cross-origin-resource-policy/fetch.any.js
new file mode 100644
index 00000000000..64a7bfeb864
--- /dev/null
+++ b/test/wpt/tests/fetch/cross-origin-resource-policy/fetch.any.js
@@ -0,0 +1,76 @@
+// META: timeout=long
+// META: global=window,dedicatedworker,sharedworker
+// META: script=/common/get-host-info.sub.js
+
+const host = get_host_info();
+const path = "/fetch/cross-origin-resource-policy/";
+const localBaseURL = host.HTTP_ORIGIN + path;
+const sameSiteBaseURL = "http://" + host.ORIGINAL_HOST + ":" + host.HTTP_PORT2 + path;
+const notSameSiteBaseURL = host.HTTP_NOTSAMESITE_ORIGIN + path;
+const httpsBaseURL = host.HTTPS_ORIGIN + path;
+
+promise_test(async () => {
+    const response = await fetch("./resources/hello.py?corp=same-origin");
+    assert_equals(await response.text(), "hello");
+}, "Same-origin fetch with a 'Cross-Origin-Resource-Policy: same-origin' response header.");
+
+promise_test(async () => {
+    const response = await fetch("./resources/hello.py?corp=same-site");
+    assert_equals(await response.text(), "hello");
+}, "Same-origin fetch with a 'Cross-Origin-Resource-Policy: same-site' response header.");
+
+promise_test(async (test) => {
+    const response = await fetch(notSameSiteBaseURL + "resources/hello.py?corp=same-origin");
+    assert_equals(await response.text(), "hello");
+}, "Cross-origin cors fetch with a 'Cross-Origin-Resource-Policy: same-origin' response header.");
+
+promise_test(async (test) => {
+    const response = await fetch(notSameSiteBaseURL + "resources/hello.py?corp=same-site");
+    assert_equals(await response.text(), "hello");
+}, "Cross-origin cors fetch with a 'Cross-Origin-Resource-Policy: same-site' response header.");
+
+promise_test((test) => {
+    const remoteURL = notSameSiteBaseURL + "resources/hello.py?corp=same-origin";
+    return promise_rejects_js(test, TypeError, fetch(remoteURL, { mode : "no-cors" }));
+}, "Cross-origin no-cors fetch with a 'Cross-Origin-Resource-Policy: same-origin' response header.");
+
+promise_test((test) => {
+    const remoteURL = notSameSiteBaseURL + "resources/hello.py?corp=same-site";
+    return promise_rejects_js(test, TypeError, fetch(remoteURL, { mode: "no-cors" }));
+}, "Cross-origin no-cors fetch with a 'Cross-Origin-Resource-Policy: same-site' response header.");
+
+promise_test((test) => {
+    const remoteURL = httpsBaseURL + "resources/hello.py?corp=same-site";
+    return promise_rejects_js(test, TypeError, fetch(remoteURL, { mode: "no-cors" }));
+}, "Cross-scheme (HTTP to HTTPS) no-cors fetch to a same-site URL with a 'Cross-Origin-Resource-Policy: same-site' response header.");
+
+promise_test((test) => {
+    const remoteURL = httpsBaseURL + "resources/hello.py?corp=same-origin";
+    return promise_rejects_js(test, TypeError, fetch(remoteURL, { mode : "no-cors" }));
+}, "Cross-origin no-cors fetch to a same-site URL with a 'Cross-Origin-Resource-Policy: same-origin' response header.");
+
+promise_test(async (test) => {
+    const remoteSameSiteURL = sameSiteBaseURL + "resources/hello.py?corp=same-site";
+
+    await fetch(remoteSameSiteURL, { mode: "no-cors" });
+
+    return promise_rejects_js(test, TypeError, fetch(sameSiteBaseURL + "resources/hello.py?corp=same-origin", { mode: "no-cors" }));
+}, "Valid cross-origin no-cors fetch with a 'Cross-Origin-Resource-Policy: same-site' response header.");
+
+promise_test((test) => {
+    const finalURL = notSameSiteBaseURL + "resources/hello.py?corp=same-origin";
+    return promise_rejects_js(test, TypeError, fetch("resources/redirect.py?redirectTo=" + encodeURIComponent(finalURL), { mode: "no-cors" }));
+}, "Cross-origin no-cors fetch with a 'Cross-Origin-Resource-Policy: same-origin' response header after a redirection.");
+
+promise_test((test) => {
+    const finalURL = localBaseURL + "resources/hello.py?corp=same-origin";
+    return fetch(notSameSiteBaseURL + "resources/redirect.py?redirectTo=" + encodeURIComponent(finalURL), { mode: "no-cors" });
+}, "Cross-origin no-cors fetch with a 'Cross-Origin-Resource-Policy: same-origin' response header after a cross-origin redirection.");
+
+promise_test(async (test) => {
+    const finalURL = localBaseURL + "resources/hello.py?corp=same-origin";
+
+    await fetch(finalURL, { mode: "no-cors" });
+
+    return promise_rejects_js(test, TypeError, fetch(notSameSiteBaseURL + "resources/redirect.py?corp=same-origin&redirectTo=" + encodeURIComponent(finalURL), { mode: "no-cors" }));
+}, "Cross-origin no-cors fetch with a 'Cross-Origin-Resource-Policy: same-origin' redirect response header.");
diff --git a/test/wpt/tests/fetch/cross-origin-resource-policy/fetch.https.any.js b/test/wpt/tests/fetch/cross-origin-resource-policy/fetch.https.any.js
new file mode 100644
index 00000000000..c9b5b7502f4
--- /dev/null
+++ b/test/wpt/tests/fetch/cross-origin-resource-policy/fetch.https.any.js
@@ -0,0 +1,56 @@
+// META: timeout=long
+// META: global=window,worker
+// META: script=/common/get-host-info.sub.js
+
+const host = get_host_info();
+const path = "/fetch/cross-origin-resource-policy/";
+const localBaseURL = host.HTTPS_ORIGIN + path;
+const notSameSiteBaseURL = host.HTTPS_NOTSAMESITE_ORIGIN + path;
+
+promise_test(async () => {
+    const response = await fetch("./resources/hello.py?corp=same-origin");
+    assert_equals(await response.text(), "hello");
+}, "Same-origin fetch with a 'Cross-Origin-Resource-Policy: same-origin' response header.");
+
+promise_test(async () => {
+    const response = await fetch("./resources/hello.py?corp=same-site");
+    assert_equals(await response.text(), "hello");
+}, "Same-origin fetch with a 'Cross-Origin-Resource-Policy: same-site' response header.");
+
+promise_test(async (test) => {
+    const response = await fetch(notSameSiteBaseURL + "resources/hello.py?corp=same-origin");
+    assert_equals(await response.text(), "hello");
+}, "Cross-origin cors fetch with a 'Cross-Origin-Resource-Policy: same-origin' response header.");
+
+promise_test(async (test) => {
+    const response = await fetch(notSameSiteBaseURL + "resources/hello.py?corp=same-site");
+    assert_equals(await response.text(), "hello");
+}, "Cross-origin cors fetch with a 'Cross-Origin-Resource-Policy: same-site' response header.");
+
+promise_test((test) => {
+    const remoteURL = notSameSiteBaseURL + "resources/hello.py?corp=same-origin";
+    return promise_rejects_js(test, TypeError, fetch(remoteURL, { mode : "no-cors" }));
+}, "Cross-origin no-cors fetch with a 'Cross-Origin-Resource-Policy: same-origin' response header.");
+
+promise_test((test) => {
+    const remoteURL = notSameSiteBaseURL + "resources/hello.py?corp=same-site";
+    return promise_rejects_js(test, TypeError, fetch(remoteURL, { mode: "no-cors" }));
+}, "Cross-origin no-cors fetch with a 'Cross-Origin-Resource-Policy: same-site' response header.");
+
+promise_test((test) => {
+    const finalURL = notSameSiteBaseURL + "resources/hello.py?corp=same-origin";
+    return promise_rejects_js(test, TypeError, fetch("resources/redirect.py?redirectTo=" + encodeURIComponent(finalURL), { mode: "no-cors" }));
+}, "Cross-origin no-cors fetch with a 'Cross-Origin-Resource-Policy: same-origin' response header after a redirection.");
+
+promise_test((test) => {
+    const finalURL = localBaseURL + "resources/hello.py?corp=same-origin";
+    return fetch(notSameSiteBaseURL + "resources/redirect.py?redirectTo=" + encodeURIComponent(finalURL), { mode: "no-cors" });
+}, "Cross-origin no-cors fetch with a 'Cross-Origin-Resource-Policy: same-origin' response header after a cross-origin redirection.");
+
+promise_test(async (test) => {
+    const finalURL = localBaseURL + "resources/hello.py?corp=same-origin";
+
+    await fetch(finalURL, { mode: "no-cors" });
+
+    return promise_rejects_js(test, TypeError, fetch(notSameSiteBaseURL + "resources/redirect.py?corp=same-origin&redirectTo=" + encodeURIComponent(finalURL), { mode: "no-cors" }));
+}, "Cross-origin no-cors fetch with a 'Cross-Origin-Resource-Policy: same-origin' redirect response header.");
diff --git a/test/wpt/tests/fetch/cross-origin-resource-policy/iframe-loads.html b/test/wpt/tests/fetch/cross-origin-resource-policy/iframe-loads.html
new file mode 100644
index 00000000000..63902c302b7
--- /dev/null
+++ b/test/wpt/tests/fetch/cross-origin-resource-policy/iframe-loads.html
@@ -0,0 +1,46 @@
+<!DOCTYPE html>
+<html>
+<head>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <script src="/common/get-host-info.sub.js"></script>
+</head>
+<body>
+    <script>
+const host = get_host_info();
+const remoteBaseURL = host.HTTP_REMOTE_ORIGIN + window.location.pathname.replace(/\/[^\/]*$/, '/') ;
+const localBaseURL = host.HTTP_ORIGIN + window.location.pathname.replace(/\/[^\/]*$/, '/') ;
+
+function with_iframe(url) {
+  return new Promise(function(resolve) {
+      var frame = document.createElement('iframe');
+      frame.src = url;
+      frame.onload = function() { resolve(frame); };
+      document.body.appendChild(frame);
+    });
+}
+
+promise_test(async() => {
+    const url = remoteBaseURL + "resources/iframe.py?corp=same-origin";
+
+    await new Promise((resolve, reject) => {
+        return fetch(url, { mode: "no-cors" }).then(reject, resolve);
+    });
+
+    const iframe = await with_iframe(url);
+    return new Promise((resolve, reject) => {
+        window.addEventListener("message", (event) => {
+            if (event.data !== "pong") {
+                reject(event.data);
+                return;
+            }
+            resolve();
+        }, false);
+        iframe.contentWindow.postMessage("ping", "*");
+    }).finally(() => {
+        iframe.remove();
+    });
+}, "Load an iframe that has Cross-Origin-Resource-Policy header");
+    </script>
+</body>
+</html>
diff --git a/test/wpt/tests/fetch/cross-origin-resource-policy/image-loads.html b/test/wpt/tests/fetch/cross-origin-resource-policy/image-loads.html
new file mode 100644
index 00000000000..060b7551ea5
--- /dev/null
+++ b/test/wpt/tests/fetch/cross-origin-resource-policy/image-loads.html
@@ -0,0 +1,54 @@
+<!DOCTYPE html>
+<html>
+<head>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <script src="/common/get-host-info.sub.js"></script>
+</head>
+<body>
+    <div id="testDiv"></div>
+    <script>
+const host = get_host_info();
+const notSameSiteBaseURL = host.HTTP_NOTSAMESITE_ORIGIN + window.location.pathname.replace(/\/[^\/]*$/, '/') ;
+const ok = true;
+const ko = false;
+const noCors = false;
+
+function loadImage(url, shoudLoad, corsMode, title)
+{
+    const testDiv = document.getElementById("testDiv");
+    promise_test(() => {
+        const img = new Image();
+        if (corsMode)
+            img.crossOrigin = corsMode;
+        img.src = url;
+        return new Promise((resolve, reject) => {
+            img.onload = shoudLoad ? resolve : reject;
+            img.onerror = shoudLoad ? reject : resolve;
+            testDiv.appendChild(img);
+        }).finally(() => {
+            testDiv.innerHTML = "";
+        });
+    }, title);
+}
+
+loadImage("./resources/image.py?corp=same-origin", ok, noCors,
+    "Same-origin image load with a 'Cross-Origin-Resource-Policy: same-origin' response header.");
+
+loadImage("./resources/image.py?corp=same-site", ok, noCors,
+    "Same-origin image load with a 'Cross-Origin-Resource-Policy: same-site' response header.");
+
+loadImage(notSameSiteBaseURL + "resources/image.py?corp=same-origin&acao=*", ok, "anonymous",
+    "Cross-origin cors image load with a 'Cross-Origin-Resource-Policy: same-origin' response header.");
+
+loadImage(notSameSiteBaseURL + "resources/image.py?corp=same-site&acao=*", ok, "anonymous",
+    "Cross-origin cors image load with a 'Cross-Origin-Resource-Policy: same-site' response header.");
+
+loadImage(notSameSiteBaseURL + "resources/image.py?corp=same-origin&acao=*", ko, noCors,
+    "Cross-origin no-cors image load with a 'Cross-Origin-Resource-Policy: same-origin' response header.");
+
+loadImage(notSameSiteBaseURL + "resources/image.py?corp=same-site&acao=*", ko, noCors,
+    "Cross-origin no-cors image load with a 'Cross-Origin-Resource-Policy: same-site' response header.");
+    </script>
+</body>
+</html>
diff --git a/test/wpt/tests/fetch/cross-origin-resource-policy/resources/green.png b/test/wpt/tests/fetch/cross-origin-resource-policy/resources/green.png
new file mode 100644
index 00000000000..28a1faab377
Binary files /dev/null and b/test/wpt/tests/fetch/cross-origin-resource-policy/resources/green.png differ
diff --git a/test/wpt/tests/fetch/cross-origin-resource-policy/resources/hello.py b/test/wpt/tests/fetch/cross-origin-resource-policy/resources/hello.py
new file mode 100644
index 00000000000..2b1cb84bad2
--- /dev/null
+++ b/test/wpt/tests/fetch/cross-origin-resource-policy/resources/hello.py
@@ -0,0 +1,6 @@
+def main(request, response):
+    headers = [(b"Cross-Origin-Resource-Policy", request.GET[b'corp'])]
+    if b'origin' in request.headers:
+        headers.append((b'Access-Control-Allow-Origin', request.headers[b'origin']))
+
+    return 200, headers, b"hello"
diff --git a/test/wpt/tests/fetch/cross-origin-resource-policy/resources/iframe.py b/test/wpt/tests/fetch/cross-origin-resource-policy/resources/iframe.py
new file mode 100644
index 00000000000..815ecf5927c
--- /dev/null
+++ b/test/wpt/tests/fetch/cross-origin-resource-policy/resources/iframe.py
@@ -0,0 +1,5 @@
+def main(request, response):
+    headers = [(b"Content-Type", b"text/html"),
+               (b"Cross-Origin-Resource-Policy", request.GET[b'corp'])]
+    return 200, headers, b"<body><h3>The iframe</h3><script>window.onmessage = () => { parent.postMessage('pong', '*'); }</script></body>"
+
diff --git a/test/wpt/tests/fetch/cross-origin-resource-policy/resources/iframeFetch.html b/test/wpt/tests/fetch/cross-origin-resource-policy/resources/iframeFetch.html
new file mode 100644
index 00000000000..257185805d9
--- /dev/null
+++ b/test/wpt/tests/fetch/cross-origin-resource-policy/resources/iframeFetch.html
@@ -0,0 +1,19 @@
+<!DOCTYPE html>
+<html>
+<head>
+    <script>
+        function processMessage(event)
+        {
+            fetch(event.data, { mode: "no-cors" }).then(() => {
+                parent.postMessage("ok", "*");
+            }, () => {
+                parent.postMessage("ko", "*");
+            });
+        }
+        window.addEventListener("message", processMessage, false);
+    </script>
+</head>
+<body>
+    <h3>The iframe making a same origin fetch call.</h3>
+</body>
+</html>
diff --git a/test/wpt/tests/fetch/cross-origin-resource-policy/resources/image.py b/test/wpt/tests/fetch/cross-origin-resource-policy/resources/image.py
new file mode 100644
index 00000000000..2a779cf11bf
--- /dev/null
+++ b/test/wpt/tests/fetch/cross-origin-resource-policy/resources/image.py
@@ -0,0 +1,22 @@
+import os.path
+
+from wptserve.utils import isomorphic_decode
+
+def main(request, response):
+    type = request.GET.first(b"type", None)
+
+    body = open(os.path.join(os.path.dirname(isomorphic_decode(__file__)), u"green.png"), u"rb").read()
+
+    response.add_required_headers = False
+    response.writer.write_status(200)
+
+    if b'corp' in request.GET:
+        response.writer.write_header(b"cross-origin-resource-policy", request.GET[b'corp'])
+    if b'acao' in request.GET:
+        response.writer.write_header(b"access-control-allow-origin", request.GET[b'acao'])
+    response.writer.write_header(b"content-length", len(body))
+    if(type != None):
+      response.writer.write_header(b"content-type", type)
+    response.writer.end_headers()
+
+    response.writer.write(body)
diff --git a/test/wpt/tests/fetch/cross-origin-resource-policy/resources/redirect.py b/test/wpt/tests/fetch/cross-origin-resource-policy/resources/redirect.py
new file mode 100644
index 00000000000..0dad4dd923b
--- /dev/null
+++ b/test/wpt/tests/fetch/cross-origin-resource-policy/resources/redirect.py
@@ -0,0 +1,6 @@
+def main(request, response):
+    headers = [(b"Location", request.GET[b'redirectTo'])]
+    if b'corp' in request.GET:
+        headers.append((b'Cross-Origin-Resource-Policy', request.GET[b'corp']))
+
+    return 302, headers, b""
diff --git a/test/wpt/tests/fetch/cross-origin-resource-policy/resources/script.py b/test/wpt/tests/fetch/cross-origin-resource-policy/resources/script.py
new file mode 100644
index 00000000000..58f8d341547
--- /dev/null
+++ b/test/wpt/tests/fetch/cross-origin-resource-policy/resources/script.py
@@ -0,0 +1,6 @@
+def main(request, response):
+    headers = [(b"Cross-Origin-Resource-Policy", request.GET[b'corp'])]
+    if b'origin' in request.headers:
+        headers.append((b'Access-Control-Allow-Origin', request.headers[b'origin']))
+
+    return 200, headers, b""
diff --git a/test/wpt/tests/fetch/cross-origin-resource-policy/scheme-restriction.any.js b/test/wpt/tests/fetch/cross-origin-resource-policy/scheme-restriction.any.js
new file mode 100644
index 00000000000..8f6338176a3
--- /dev/null
+++ b/test/wpt/tests/fetch/cross-origin-resource-policy/scheme-restriction.any.js
@@ -0,0 +1,7 @@
+// META: script=/common/get-host-info.sub.js
+
+promise_test(t => {
+  return promise_rejects_js(t,
+                         TypeError,
+                         fetch(get_host_info().HTTPS_REMOTE_ORIGIN + "/fetch/cross-origin-resource-policy/resources/hello.py?corp=same-site", { mode: "no-cors" }));
+}, "Cross-Origin-Resource-Policy: same-site blocks retrieving HTTPS from HTTP");
diff --git a/test/wpt/tests/fetch/cross-origin-resource-policy/scheme-restriction.https.window.js b/test/wpt/tests/fetch/cross-origin-resource-policy/scheme-restriction.https.window.js
new file mode 100644
index 00000000000..4c745718741
--- /dev/null
+++ b/test/wpt/tests/fetch/cross-origin-resource-policy/scheme-restriction.https.window.js
@@ -0,0 +1,13 @@
+// META: script=/common/get-host-info.sub.js
+
+promise_test(t => {
+  const img = new Image();
+  img.src = get_host_info().HTTP_REMOTE_ORIGIN + "/fetch/cross-origin-resource-policy/resources/image.py?corp=same-site";
+  return new Promise((resolve, reject) => {
+    img.onload = resolve;
+    img.onerror = reject;
+    document.body.appendChild(img);
+  }).finally(() => {
+    img.remove();
+  });
+}, "Cross-Origin-Resource-Policy does not block Mixed Content <img>");
diff --git a/test/wpt/tests/fetch/cross-origin-resource-policy/script-loads.html b/test/wpt/tests/fetch/cross-origin-resource-policy/script-loads.html
new file mode 100644
index 00000000000..a9690fc70be
--- /dev/null
+++ b/test/wpt/tests/fetch/cross-origin-resource-policy/script-loads.html
@@ -0,0 +1,52 @@
+<!DOCTYPE html>
+<html>
+<head>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <script src="/common/get-host-info.sub.js"></script>
+</head>
+<body>
+    <div id="testDiv"></div>
+    <script>
+const host = get_host_info();
+const notSameSiteBaseURL = host.HTTP_NOTSAMESITE_ORIGIN + window.location.pathname.replace(/\/[^\/]*$/, '/') ;
+const ok = true;
+const ko = false;
+const noCors = false;
+
+function loadScript(url, shoudLoad, corsMode, title)
+{
+    const testDiv = document.getElementById("testDiv");
+    promise_test(() => {
+        const script = document.createElement("script");
+        if (corsMode)
+            script.crossOrigin = corsMode;
+        script.src = url;
+        return new Promise((resolve, reject) => {
+            script.onload = shoudLoad ? resolve : reject;
+            script.onerror = shoudLoad ? reject : resolve;
+            testDiv.appendChild(script);
+        });
+    }, title);
+}
+
+loadScript("./resources/script.py?corp=same-origin", ok, noCors,
+    "Same-origin script load with a 'Cross-Origin-Resource-Policy: same-origin' response header.");
+
+loadScript("./resources/script.py?corp=same-site", ok, noCors,
+    "Same-origin script load with a 'Cross-Origin-Resource-Policy: same-site' response header.");
+
+loadScript(notSameSiteBaseURL + "resources/script.py?corp=same-origin&acao=*", ok, "anonymous",
+    "Cross-origin cors script load with a 'Cross-Origin-Resource-Policy: same-origin' response header.");
+
+loadScript(notSameSiteBaseURL + "resources/script.py?corp=same-site&acao=*", ok, "anonymous",
+    "Cross-origin cors script load with a 'Cross-Origin-Resource-Policy: same-site' response header.");
+
+loadScript(notSameSiteBaseURL + "resources/script.py?corp=same-origin&acao=*", ko, noCors,
+    "Cross-origin no-cors script load with a 'Cross-Origin-Resource-Policy: same-origin' response header.");
+
+loadScript(notSameSiteBaseURL + "resources/script.py?corp=same-site&acao=*", ko, noCors,
+    "Cross-origin no-cors script load with a 'Cross-Origin-Resource-Policy: same-site' response header.");
+    </script>
+</body>
+</html>
diff --git a/test/wpt/tests/fetch/cross-origin-resource-policy/syntax.any.js b/test/wpt/tests/fetch/cross-origin-resource-policy/syntax.any.js
new file mode 100644
index 00000000000..dc874977a63
--- /dev/null
+++ b/test/wpt/tests/fetch/cross-origin-resource-policy/syntax.any.js
@@ -0,0 +1,19 @@
+// META: script=/common/get-host-info.sub.js
+
+const crossOriginURL = get_host_info().HTTP_REMOTE_ORIGIN + "/fetch/cross-origin-resource-policy/resources/hello.py?corp=";
+
+[
+  "same",
+  "same, same-origin",
+  "SAME-ORIGIN",
+  "Same-Origin",
+  "same-origin, <>",
+  "same-origin, same-origin",
+  "https://www.example.com",  // See https://github.com/whatwg/fetch/issues/760
+].forEach(incorrectHeaderValue => {
+  // Note: an incorrect value results in a successful load, so this test is only meaningful in
+  // implementations with support for the header.
+  promise_test(t => {
+    return fetch(crossOriginURL + encodeURIComponent(incorrectHeaderValue), { mode: "no-cors" });
+  }, "Parsing Cross-Origin-Resource-Policy: " + incorrectHeaderValue);
+});
diff --git a/test/wpt/tests/fetch/data-urls/README.md b/test/wpt/tests/fetch/data-urls/README.md
new file mode 100644
index 00000000000..1ce5b18b538
--- /dev/null
+++ b/test/wpt/tests/fetch/data-urls/README.md
@@ -0,0 +1,11 @@
+## data: URLs
+
+`resources/data-urls.json` contains `data:` URL tests. The tests are encoded as a JSON array. Each value in the array is an array of two or three values. The first value describes the input, the second value describes the expected MIME type, null if the input is expected to fail somehow, or the empty string if the expected value is `text/plain;charset=US-ASCII`. The third value, if present, describes the expected body as an array of integers representing bytes.
+
+These tests are used for `data:` URLs in this directory (see `processing.any.js`).
+
+## Forgiving-base64 decode
+
+`resources/base64.json` contains [forgiving-base64 decode](https://infra.spec.whatwg.org/#forgiving-base64-decode) tests. The tests are encoded as a JSON array. Each value in the array is an array of two values. The first value describes the input, the second value describes the output as an array of integers representing bytes or null if the input cannot be decoded.
+
+These tests are used for `data:` URLs in this directory (see `base64.any.js`) and `window.atob()` in `../../html/webappapis/atob/base64.html`.
diff --git a/test/wpt/tests/fetch/h1-parsing/README.md b/test/wpt/tests/fetch/h1-parsing/README.md
new file mode 100644
index 00000000000..487a892dcff
--- /dev/null
+++ b/test/wpt/tests/fetch/h1-parsing/README.md
@@ -0,0 +1,5 @@
+This directory tries to document "rough consensus" on where HTTP/1 parsing should end up between browsers.
+
+Any tests that browsers currently fail should have associated bug reports.
+
+[whatwg/fetch issue #1156](https://github.com/whatwg/fetch/issues/1156) provides context for this effort and pointers to the various issues, pull requests, and bug reports that are associated with it.
diff --git a/test/wpt/tests/fetch/h1-parsing/lone-cr.window.js b/test/wpt/tests/fetch/h1-parsing/lone-cr.window.js
new file mode 100644
index 00000000000..6b46ed632f4
--- /dev/null
+++ b/test/wpt/tests/fetch/h1-parsing/lone-cr.window.js
@@ -0,0 +1,23 @@
+// These tests expect that a network error is returned if there's a CR that is not immediately
+// followed by LF before reaching message-body.
+//
+// No browser does this currently, but Firefox does treat it equivalently to a space which gives
+// hope.
+
+[
+  "HTTP/1.1\r200 OK\n\nBODY",
+  "HTTP/1.1 200\rOK\n\nBODY",
+  "HTTP/1.1 200 OK\n\rHeader: Value\n\nBODY",
+  "HTTP/1.1 200 OK\nHeader\r: Value\n\nBODY",
+  "HTTP/1.1 200 OK\nHeader:\r Value\n\nBODY",
+  "HTTP/1.1 200 OK\nHeader: Value\r\n\nBody",
+  "HTTP/1.1 200 OK\nHeader: Value\r\r\nBODY",
+  "HTTP/1.1 200 OK\nHeader: Value\rHeader2: Value2\n\nBODY",
+  "HTTP/1.1 200 OK\nHeader: Value\n\rBODY",
+  "HTTP/1.1 200 OK\nHeader: Value\n\r"
+].forEach(input => {
+  promise_test(t => {
+    const message = encodeURIComponent(input);
+    return promise_rejects_js(t, TypeError, fetch(`resources/message.py?message=${message}`));
+  }, `Parsing response with a lone CR before message-body (${input})`);
+});
diff --git a/test/wpt/tests/fetch/h1-parsing/resources-with-0x00-in-header.window.js b/test/wpt/tests/fetch/h1-parsing/resources-with-0x00-in-header.window.js
new file mode 100644
index 00000000000..f1afeeb740b
--- /dev/null
+++ b/test/wpt/tests/fetch/h1-parsing/resources-with-0x00-in-header.window.js
@@ -0,0 +1,31 @@
+async_test(t => {
+  const script = document.createElement("script");
+  t.add_cleanup(() => script.remove());
+  script.src = "resources/script-with-0x00-in-header.py";
+  script.onerror = t.step_func_done();
+  script.onload = t.unreached_func();
+  document.body.append(script);
+}, "Expect network error for script with 0x00 in a header");
+
+async_test(t => {
+  const frame = document.createElement("iframe");
+  t.add_cleanup(() => frame.remove());
+  frame.src = "resources/document-with-0x00-in-header.py";
+  // If network errors result in load events for frames per
+  // https://github.com/whatwg/html/issues/125 and https://github.com/whatwg/html/issues/1230 this
+  // should be changed to use the load event instead.
+  t.step_timeout(() => {
+    assert_equals(frame.contentDocument, null);
+    t.done();
+  }, 1000);
+  document.body.append(frame);
+}, "Expect network error for frame navigation to resource with 0x00 in a header");
+
+async_test(t => {
+  const img = document.createElement("img");
+  t.add_cleanup(() => img.remove());
+  img.src = "resources/blue-with-0x00-in-a-header.asis";
+  img.onerror = t.step_func_done();
+  img.onload = t.unreached_func();
+  document.body.append(img);
+}, "Expect network error for image with 0x00 in a header");
diff --git a/test/wpt/tests/fetch/h1-parsing/resources/README.md b/test/wpt/tests/fetch/h1-parsing/resources/README.md
new file mode 100644
index 00000000000..2175d274088
--- /dev/null
+++ b/test/wpt/tests/fetch/h1-parsing/resources/README.md
@@ -0,0 +1,6 @@
+`blue-with-0x00-in-a-header.asis` is a copy from `../../images/blue.png` with the following prepended using Control Pictures to signify actual newlines and 0x00:
+```
+HTTP/1.1 200 AN IMAGE␍␊
+Content-Type: image/png␍␊
+Custom: ␀␍␊␍␊
+```
diff --git a/test/wpt/tests/fetch/h1-parsing/resources/blue-with-0x00-in-a-header.asis b/test/wpt/tests/fetch/h1-parsing/resources/blue-with-0x00-in-a-header.asis
new file mode 100644
index 00000000000..102340a6313
Binary files /dev/null and b/test/wpt/tests/fetch/h1-parsing/resources/blue-with-0x00-in-a-header.asis differ
diff --git a/test/wpt/tests/fetch/h1-parsing/resources/document-with-0x00-in-header.py b/test/wpt/tests/fetch/h1-parsing/resources/document-with-0x00-in-header.py
new file mode 100644
index 00000000000..223b3c40278
--- /dev/null
+++ b/test/wpt/tests/fetch/h1-parsing/resources/document-with-0x00-in-header.py
@@ -0,0 +1,4 @@
+def main(request, response):
+    response.headers.set(b"Content-Type", b"text/html")
+    response.headers.set(b"Custom", b"\0")
+    return b"<!doctype html><b>This is a document.</b>"
diff --git a/test/wpt/tests/fetch/h1-parsing/resources/message.py b/test/wpt/tests/fetch/h1-parsing/resources/message.py
new file mode 100644
index 00000000000..640080c18bc
--- /dev/null
+++ b/test/wpt/tests/fetch/h1-parsing/resources/message.py
@@ -0,0 +1,3 @@
+def main(request, response):
+    response.writer.write(request.GET.first(b"message"))
+    response.close_connection = True
diff --git a/test/wpt/tests/fetch/h1-parsing/resources/script-with-0x00-in-header.py b/test/wpt/tests/fetch/h1-parsing/resources/script-with-0x00-in-header.py
new file mode 100644
index 00000000000..39f58d8270e
--- /dev/null
+++ b/test/wpt/tests/fetch/h1-parsing/resources/script-with-0x00-in-header.py
@@ -0,0 +1,4 @@
+def main(request, response):
+    response.headers.set(b"Content-Type", b"text/javascript")
+    response.headers.set(b"Custom", b"\0")
+    return b"var thisIsJavaScript = 0"
diff --git a/test/wpt/tests/fetch/h1-parsing/resources/status-code.py b/test/wpt/tests/fetch/h1-parsing/resources/status-code.py
new file mode 100644
index 00000000000..5421893b267
--- /dev/null
+++ b/test/wpt/tests/fetch/h1-parsing/resources/status-code.py
@@ -0,0 +1,6 @@
+def main(request, response):
+    output = b"HTTP/1.1 "
+    output += request.GET.first(b"input")
+    output += b"\nheader-parsing: is sad\n"
+    response.writer.write(output)
+    response.close_connection = True
diff --git a/test/wpt/tests/fetch/h1-parsing/status-code.window.js b/test/wpt/tests/fetch/h1-parsing/status-code.window.js
new file mode 100644
index 00000000000..5776cf4050f
--- /dev/null
+++ b/test/wpt/tests/fetch/h1-parsing/status-code.window.js
@@ -0,0 +1,98 @@
+[
+  {
+    input: "",
+    expected: null
+  },
+  {
+    input: "BLAH",
+    expected: null
+  },
+  {
+    input: "0 OK",
+    expected: {
+      status: 0,
+      statusText: "OK"
+    }
+  },
+  {
+    input: "1 OK",
+    expected: {
+      status: 1,
+      statusText: "OK"
+    }
+  },
+  {
+    input: "99 NOT OK",
+    expected: {
+      status: 99,
+      statusText: "NOT OK"
+    }
+  },
+  {
+    input: "077 77",
+    expected: {
+      status: 77,
+      statusText: "77"
+    }
+  },
+  {
+    input: "099 HELLO",
+    expected: {
+      status: 99,
+      statusText: "HELLO"
+    }
+  },
+  {
+    input: "200",
+    expected: {
+      status: 200,
+      statusText: ""
+    }
+  },
+  {
+    input: "999 DOES IT MATTER",
+    expected: {
+      status: 999,
+      statusText: "DOES IT MATTER"
+    }
+  },
+  {
+    input: "1000 BOO",
+    expected: null
+  },
+  {
+    input: "0200 BOO",
+    expected: null
+  },
+  {
+    input: "65736 NOT 200 OR SOME SUCH",
+    expected: null
+  },
+  {
+    input: "131072 HI",
+    expected: null
+  },
+  {
+    input: "-200 TEST",
+    expected: null
+  },
+  {
+    input: "0xA",
+    expected: null
+  },
+  {
+    input: "C8",
+    expected: null
+  }
+].forEach(({ description, input, expected }) => {
+  promise_test(async t => {
+    if (expected !== null) {
+      const response = await fetch("resources/status-code.py?input=" + input);
+      assert_equals(response.status, expected.status);
+      assert_equals(response.statusText, expected.statusText);
+      assert_equals(response.headers.get("header-parsing"), "is sad");
+    } else {
+      await promise_rejects_js(t, TypeError, fetch("resources/status-code.py?input=" + input));
+    }
+  }, `HTTP/1.1 ${input} ${expected === null ? "(network error)" : ""}`);
+});
diff --git a/test/wpt/tests/fetch/http-cache/304-update.any.js b/test/wpt/tests/fetch/http-cache/304-update.any.js
new file mode 100644
index 00000000000..15484f01eb3
--- /dev/null
+++ b/test/wpt/tests/fetch/http-cache/304-update.any.js
@@ -0,0 +1,146 @@
+// META: global=window,worker
+// META: title=HTTP Cache - 304 Updates
+// META: timeout=long
+// META: script=/common/utils.js
+// META: script=/common/get-host-info.sub.js
+// META: script=http-cache.js
+
+var tests = [
+  {
+    name: "HTTP cache updates returned headers from a Last-Modified 304",
+    requests: [
+      {
+        response_headers: [
+          ["Expires", -5000],
+          ["Last-Modified", -3000],
+          ["Test-Header", "A"]
+        ]
+      },
+      {
+        response_headers: [
+          ["Expires", -3000],
+          ["Last-Modified", -3000],
+          ["Test-Header", "B"]
+        ],
+        expected_type: "lm_validated",
+        expected_response_headers: [
+          ["Test-Header", "B"]
+        ]
+      }
+    ]
+  },
+  {
+    name: "HTTP cache updates stored headers from a Last-Modified 304",
+    requests: [
+      {
+        response_headers: [
+          ["Expires", -5000],
+          ["Last-Modified", -3000],
+          ["Test-Header", "A"]
+        ]
+      },
+      {
+        response_headers: [
+          ["Expires", 3000],
+          ["Last-Modified", -3000],
+          ["Test-Header", "B"]
+        ],
+        expected_type: "lm_validated",
+        expected_response_headers: [
+          ["Test-Header", "B"]
+        ],
+        pause_after: true
+      },
+      {
+        expected_type: "cached",
+        expected_response_headers: [
+          ["Test-Header", "B"]
+        ]
+      }
+    ]
+  },
+  {
+    name: "HTTP cache updates returned headers from a ETag 304",
+    requests: [
+      {
+        response_headers: [
+          ["Expires", -5000],
+          ["ETag", "ABC"],
+          ["Test-Header", "A"]
+        ]
+      },
+      {
+        response_headers: [
+          ["Expires", -3000],
+          ["ETag", "ABC"],
+          ["Test-Header", "B"]
+        ],
+        expected_type: "etag_validated",
+        expected_response_headers: [
+          ["Test-Header", "B"]
+        ]
+      }
+    ]
+  },
+  {
+    name: "HTTP cache updates stored headers from a ETag 304",
+    requests: [
+      {
+        response_headers: [
+          ["Expires", -5000],
+          ["ETag", "DEF"],
+          ["Test-Header", "A"]
+        ]
+      },
+      {
+        response_headers: [
+          ["Expires", 3000],
+          ["ETag", "DEF"],
+          ["Test-Header", "B"]
+        ],
+        expected_type: "etag_validated",
+        expected_response_headers: [
+          ["Test-Header", "B"]
+        ],
+        pause_after: true
+      },
+      {
+        expected_type: "cached",
+        expected_response_headers: [
+          ["Test-Header", "B"]
+        ]
+      }
+    ]
+  },
+  {
+    name: "Content-* header",
+    requests: [
+      {
+        response_headers: [
+          ["Expires", -5000],
+          ["ETag", "GHI"],
+          ["Content-Test-Header", "A"]
+        ]
+      },
+      {
+        response_headers: [
+          ["Expires", 3000],
+          ["ETag", "GHI"],
+          ["Content-Test-Header", "B"]
+        ],
+        expected_type: "etag_validated",
+        expected_response_headers: [
+          ["Content-Test-Header", "B"]
+        ],
+        pause_after: true
+      },
+      {
+        expected_type: "cached",
+        expected_response_headers: [
+          ["Content-Test-Header", "B"]
+        ]
+      }
+    ]
+  },
+];
+run_tests(tests);
diff --git a/test/wpt/tests/fetch/http-cache/README.md b/test/wpt/tests/fetch/http-cache/README.md
new file mode 100644
index 00000000000..512c422e108
--- /dev/null
+++ b/test/wpt/tests/fetch/http-cache/README.md
@@ -0,0 +1,72 @@
+## HTTP Caching Tests
+
+These tests cover HTTP-specified behaviours for caches, primarily from
+[RFC9111](https://www.rfc-editor.org/rfc/rfc9111.html), but as seen through the
+lens of Fetch.
+
+A few notes:
+
+* By its nature, [caching is entirely optional](
+  https://www.rfc-editor.org/rfc/rfc9111.html#section-2-2);
+  some tests expecting a response to be
+  cached might fail because the client chose not to cache it, or chose to
+  race the cache with a network request.
+
+* Likewise, some tests might fail because there is a separate document-level
+  cache that's not well defined; see [this
+  issue](https://github.com/whatwg/fetch/issues/354).
+
+* [Partial content tests](partial.any.js) (a.k.a. Range requests) are not specified
+  in Fetch; tests are included here for interest only.
+
+* Some browser caches will behave differently when reloading /
+  shift-reloading, despite the `cache mode` staying the same.
+
+* [cache-tests.fyi](https://cache-tests.fyi/) is another test suite of HTTP caching
+  which also caters to server/CDN implementations.
+
+## Test Format
+
+Each test run gets its own URL and randomized content and operates independently.
+
+Each test is an an array of objects, with the following members:
+
+- `name` - The name of the test.
+- `requests` - a list of request objects (see below).
+
+Possible members of a request object:
+
+- template - A template object for the request, by name.
+- request_method - A string containing the HTTP method to be used.
+- request_headers - An array of `[header_name_string, header_value_string]` arrays to
+                    emit in the request.
+- request_body - A string to use as the request body.
+- mode - The mode string to pass to `fetch()`.
+- credentials - The credentials string to pass to `fetch()`.
+- cache - The cache string to pass to `fetch()`.
+- pause_after - Boolean controlling a 3-second pause after the request completes.
+- response_status - A `[number, string]` array containing the HTTP status code
+                    and phrase to return.
+- response_headers - An array of `[header_name_string, header_value_string]` arrays to
+                     emit in the response. These values will also be checked like
+                     expected_response_headers, unless there is a third value that is
+                     `false`. See below for special handling considerations.
+- response_body - String to send as the response body. If not set, it will contain
+                  the test identifier.
+- expected_type - One of `["cached", "not_cached", "lm_validate", "etag_validate", "error"]`
+- expected_status - A number representing a HTTP status code to check the response for.
+                    If not set, the value of `response_status[0]` will be used; if that
+                    is not set, 200 will be used.
+- expected_request_headers - An array of `[header_name_string, header_value_string]` representing
+                              headers to check the request for.
+- expected_response_headers - An array of `[header_name_string, header_value_string]` representing
+                              headers to check the response for. See also response_headers.
+- expected_response_text - A string to check the response body against. If not present, `response_body` will be checked if present and non-null; otherwise the response body will be checked for the test uuid (unless the status code disallows a body). Set to `null` to disable all response body checking.
+
+Some headers in `response_headers` are treated specially:
+
+* For date-carrying headers, if the value is a number, it will be interpreted as a delta to the time of the first request at the server.
+* For URL-carrying headers, the value will be appended as a query parameter for `target`.
+
+See the source for exact details.
+
diff --git a/test/wpt/tests/fetch/http-cache/basic-auth-cache-test-ref.html b/test/wpt/tests/fetch/http-cache/basic-auth-cache-test-ref.html
new file mode 100644
index 00000000000..905facdc888
--- /dev/null
+++ b/test/wpt/tests/fetch/http-cache/basic-auth-cache-test-ref.html
@@ -0,0 +1,6 @@
+<!doctype html>
+<html>
+  <meta charset="utf-8">
+  <img src="/images/green.png">
+  <img src="/images/green.png">
+</html>
diff --git a/test/wpt/tests/fetch/http-cache/basic-auth-cache-test.html b/test/wpt/tests/fetch/http-cache/basic-auth-cache-test.html
new file mode 100644
index 00000000000..a8979baf548
--- /dev/null
+++ b/test/wpt/tests/fetch/http-cache/basic-auth-cache-test.html
@@ -0,0 +1,27 @@
+<!doctype html>
+<html id="doc" class="reftest-wait">
+  <meta charset="utf-8">
+  <link rel="match" href="basic-auth-cache-test-ref.html">
+
+  <img id="auth" onload="loadNoAuth()">
+  <img id="noauth" onload="removeWait()">
+
+
+  <script type="text/javascript">
+    function loadAuth() {
+        var authUrl = 'http://testuser:testpass@' + window.location.host + '/fetch/http-cache/resources/securedimage.py';
+        document.getElementById('auth').src = authUrl;
+    }
+
+    function loadNoAuth() {
+        var noAuthUrl = 'http://' + window.location.host + '/fetch/http-cache/resources/securedimage.py';
+        document.getElementById('noauth').src = noAuthUrl;
+    }
+
+    function removeWait() {
+        document.getElementById('doc').className = "";
+    }
+
+    window.onload = loadAuth;
+  </script>
+</html>
diff --git a/test/wpt/tests/fetch/http-cache/cache-mode.any.js b/test/wpt/tests/fetch/http-cache/cache-mode.any.js
new file mode 100644
index 00000000000..8f406d5a6a5
--- /dev/null
+++ b/test/wpt/tests/fetch/http-cache/cache-mode.any.js
@@ -0,0 +1,61 @@
+// META: global=window,worker
+// META: title=Fetch - Cache Mode
+// META: timeout=long
+// META: script=/common/utils.js
+// META: script=/common/get-host-info.sub.js
+// META: script=http-cache.js
+
+var tests = [
+  {
+    name: "Fetch sends Cache-Control: max-age=0 when cache mode is no-cache",
+    requests: [
+      {
+        cache: "no-cache",
+        expected_request_headers: [['cache-control', 'max-age=0']]
+      }
+    ]
+  },
+  {
+    name: "Fetch doesn't touch Cache-Control when cache mode is no-cache and Cache-Control is already present",
+    requests: [
+      {
+        cache: "no-cache",
+        request_headers: [['cache-control', 'foo']],
+        expected_request_headers: [['cache-control', 'foo']]
+      }
+    ]
+  },
+  {
+    name: "Fetch sends Cache-Control: no-cache and Pragma: no-cache when cache mode is no-store",
+    requests: [
+      {
+        cache: "no-store",
+        expected_request_headers: [
+          ['cache-control', 'no-cache'],
+          ['pragma', 'no-cache']
+        ]
+      }
+    ]
+  },
+  {
+    name: "Fetch doesn't touch Cache-Control when cache mode is no-store and Cache-Control is already present",
+    requests: [
+      {
+        cache: "no-store",
+        request_headers: [['cache-control', 'foo']],
+        expected_request_headers: [['cache-control', 'foo']]
+      }
+    ]
+  },
+  {
+    name: "Fetch doesn't touch Pragma when cache mode is no-store and Pragma is already present",
+    requests: [
+      {
+        cache: "no-store",
+        request_headers: [['pragma', 'foo']],
+        expected_request_headers: [['pragma', 'foo']]
+      }
+    ]
+  }
+];
+run_tests(tests);
diff --git a/test/wpt/tests/fetch/http-cache/cc-request.any.js b/test/wpt/tests/fetch/http-cache/cc-request.any.js
new file mode 100644
index 00000000000..d5565668414
--- /dev/null
+++ b/test/wpt/tests/fetch/http-cache/cc-request.any.js
@@ -0,0 +1,202 @@
+// META: global=window,worker
+// META: title=HTTP Cache - Cache-Control Request Directives
+// META: timeout=long
+// META: script=/common/utils.js
+// META: script=/common/get-host-info.sub.js
+// META: script=http-cache.js
+
+var tests = [
+  {
+    name: "HTTP cache doesn't use aged but fresh response when request contains Cache-Control: max-age=0",
+    requests: [
+      {
+        template: "fresh",
+        pause_after: true
+      },
+      {
+        request_headers: [
+          ["Cache-Control", "max-age=0"]
+        ],
+        expected_type: "not_cached"
+      }
+    ]
+  },
+  {
+    name: "HTTP cache doesn't use aged but fresh response when request contains Cache-Control: max-age=1",
+    requests: [
+      {
+        template: "fresh",
+        pause_after: true
+      },
+      {
+        request_headers: [
+          ["Cache-Control", "max-age=1"]
+        ],
+        expected_type: "not_cached"
+      }
+    ]
+  },
+  {
+    name: "HTTP cache doesn't use fresh response with Age header when request contains Cache-Control: max-age that is greater than remaining freshness",
+    requests: [
+      {
+        response_headers: [
+          ["Cache-Control", "max-age=3600"],
+          ["Age", "1800"]
+        ]
+      },
+      {
+        request_headers: [
+          ["Cache-Control", "max-age=600"]
+        ],
+        expected_type: "not_cached"
+      }
+    ]
+  },
+  {
+    name: "HTTP cache does use aged stale response when request contains Cache-Control: max-stale that permits its use",
+    requests: [
+      {
+        response_headers: [
+          ["Cache-Control", "max-age=1"]
+        ],
+        pause_after: true
+      },
+      {
+        request_headers: [
+          ["Cache-Control", "max-stale=1000"]
+        ],
+        expected_type: "cached"
+      }
+    ]
+  },
+  {
+    name: "HTTP cache does reuse stale response with Age header when request contains Cache-Control: max-stale that permits its use",
+    requests: [
+      {
+        response_headers: [
+          ["Cache-Control", "max-age=1500"],
+          ["Age", "2000"]
+        ]
+      },
+      {
+        request_headers: [
+          ["Cache-Control", "max-stale=1000"]
+        ],
+        expected_type: "cached"
+      }
+    ]
+  },
+  {
+    name: "HTTP cache doesn't reuse fresh response when request contains Cache-Control: min-fresh that wants it fresher",
+    requests: [
+      {
+        response_headers: [
+          ["Cache-Control", "max-age=1500"]
+        ]
+      },
+      {
+        request_headers: [
+          ["Cache-Control", "min-fresh=2000"]
+        ],
+        expected_type: "not_cached"
+      }
+    ]
+  },
+  {
+    name: "HTTP cache doesn't reuse fresh response with Age header when request contains Cache-Control: min-fresh that wants it fresher",
+    requests: [
+      {
+        response_headers: [
+          ["Cache-Control", "max-age=1500"],
+          ["Age", "1000"]
+        ]
+      },
+      {
+        request_headers: [
+          ["Cache-Control", "min-fresh=1000"]
+        ],
+        expected_type: "not_cached"
+      }
+    ]
+  },
+  {
+    name: "HTTP cache doesn't reuse fresh response when request contains Cache-Control: no-cache",
+    requests: [
+      {
+        response_headers: [
+          ["Cache-Control", "max-age=3600"]
+        ]
+      },
+      {
+        request_headers: [
+          ["Cache-Control", "no-cache"]
+        ],
+        expected_type: "not_cached"
+      }
+    ]
+  },
+  {
+    name: "HTTP cache validates fresh response with Last-Modified when request contains Cache-Control: no-cache",
+    requests: [
+      {
+        response_headers: [
+          ["Cache-Control", "max-age=3600"],
+          ["Last-Modified", -10000]
+        ]
+      },
+      {
+        request_headers: [
+          ["Cache-Control", "no-cache"]
+        ],
+        expected_type: "lm_validate"
+      }
+    ]
+  },
+  {
+    name: "HTTP cache validates fresh response with ETag when request contains Cache-Control: no-cache",
+    requests: [
+      {
+        response_headers: [
+          ["Cache-Control", "max-age=3600"],
+          ["ETag", http_content("abc")]
+        ]
+      },
+      {
+        request_headers: [
+          ["Cache-Control", "no-cache"]
+        ],
+        expected_type: "etag_validate"
+      }
+    ]
+  },
+  {
+    name: "HTTP cache doesn't reuse fresh response when request contains Cache-Control: no-store",
+    requests: [
+      {
+        response_headers: [
+          ["Cache-Control", "max-age=3600"]
+        ]
+      },
+      {
+        request_headers: [
+          ["Cache-Control", "no-store"]
+        ],
+        expected_type: "not_cached"
+      }
+    ]
+  },
+  {
+    name: "HTTP cache generates 504 status code when nothing is in cache and request contains Cache-Control: only-if-cached",
+    requests: [
+      {
+        request_headers: [
+          ["Cache-Control", "only-if-cached"]
+        ],
+        expected_status: 504,
+        expected_response_text: null
+      }
+    ]
+  }
+];
+run_tests(tests);
diff --git a/test/wpt/tests/fetch/http-cache/credentials.tentative.any.js b/test/wpt/tests/fetch/http-cache/credentials.tentative.any.js
new file mode 100644
index 00000000000..31770925cde
--- /dev/null
+++ b/test/wpt/tests/fetch/http-cache/credentials.tentative.any.js
@@ -0,0 +1,62 @@
+// META: global=window,worker
+// META: title=HTTP Cache - Content
+// META: timeout=long
+// META: script=/common/utils.js
+// META: script=http-cache.js
+
+// This is a tentative test.
+// Firefox behavior is used as expectations.
+//
+// whatwg/fetch issue:
+// https://github.com/whatwg/fetch/issues/1253
+//
+// Chrome design doc:
+// https://docs.google.com/document/d/1lvbiy4n-GM5I56Ncw304sgvY5Td32R6KHitjRXvkZ6U/edit#
+
+const request_cacheable = {
+  request_headers: [],
+  response_headers: [
+    ['Cache-Control', 'max-age=3600'],
+  ],
+  // TODO(arthursonzogni): The behavior is tested only for same-origin requests.
+  // It must behave similarly for cross-site and cross-origin requests. The
+  // problems is the http-cache.js infrastructure returns the
+  // "Server-Request-Count" as HTTP response headers, which aren't readable for
+  // CORS requests.
+  base_url: location.href.replace(/\/[^\/]*$/, '/'),
+};
+
+const request_credentialled = { ...request_cacheable, credentials: 'include', };
+const request_anonymous     = { ...request_cacheable, credentials: 'omit', };
+
+const responseIndex = count => {
+  return {
+    expected_response_headers: [
+      ['Server-Request-Count', count.toString()],
+    ],
+  }
+};
+
+var tests = [
+  {
+    name: 'same-origin: 2xAnonymous, 2xCredentialled, 1xAnonymous',
+    requests: [
+      { ...request_anonymous     , ...responseIndex(1)} ,
+      { ...request_anonymous     , ...responseIndex(1)} ,
+      { ...request_credentialled , ...responseIndex(2)} ,
+      { ...request_credentialled , ...responseIndex(2)} ,
+      { ...request_anonymous     , ...responseIndex(1)} ,
+    ]
+  },
+  {
+    name: 'same-origin: 2xCredentialled, 2xAnonymous, 1xCredentialled',
+    requests: [
+      { ...request_credentialled , ...responseIndex(1)} ,
+      { ...request_credentialled , ...responseIndex(1)} ,
+      { ...request_anonymous     , ...responseIndex(2)} ,
+      { ...request_anonymous     , ...responseIndex(2)} ,
+      { ...request_credentialled , ...responseIndex(1)} ,
+    ]
+  },
+];
+run_tests(tests);
diff --git a/test/wpt/tests/fetch/http-cache/freshness.any.js b/test/wpt/tests/fetch/http-cache/freshness.any.js
new file mode 100644
index 00000000000..6b97c8244f6
--- /dev/null
+++ b/test/wpt/tests/fetch/http-cache/freshness.any.js
@@ -0,0 +1,215 @@
+// META: global=window,worker
+// META: title=HTTP Cache - Freshness
+// META: timeout=long
+// META: script=/common/utils.js
+// META: script=/common/get-host-info.sub.js
+// META: script=http-cache.js
+
+var tests = [
+  // response directives
+  {
+    name: "HTTP cache reuses a response with a future Expires",
+    requests: [
+      {
+        response_headers: [
+          ["Expires", (30 * 24 * 60 * 60)]
+        ]
+      },
+      {
+        expected_type: "cached"
+      }
+    ]
+  },
+  {
+    name: "HTTP cache does not reuse a response with a past Expires",
+    requests: [
+      {
+        response_headers: [
+          ["Expires", (-30 * 24 * 60 * 60)]
+        ]
+      },
+      {
+        expected_type: "not_cached"
+      }
+    ]
+  },
+  {
+    name: "HTTP cache does not reuse a response with a present Expires",
+    requests: [
+      {
+        response_headers: [
+          ["Expires", 0]
+        ]
+      },
+      {
+        expected_type: "not_cached"
+      }
+    ]
+  },
+  {
+    name: "HTTP cache does not reuse a response with an invalid Expires",
+    requests: [
+      {
+        response_headers: [
+          ["Expires", "0"]
+        ]
+      },
+      {
+        expected_type: "not_cached"
+      }
+    ]
+  },
+  {
+    name: "HTTP cache reuses a response with positive Cache-Control: max-age",
+    requests: [
+      {
+        response_headers: [
+          ["Cache-Control", "max-age=3600"]
+        ]
+      },
+      {
+        expected_type: "cached"
+      }
+    ]
+  },
+  {
+    name: "HTTP cache does not reuse a response with Cache-Control: max-age=0",
+    requests: [
+      {
+        response_headers: [
+          ["Cache-Control", "max-age=0"]
+        ]
+      },
+      {
+        expected_type: "not_cached"
+      }
+    ]
+  },
+  {
+    name: "HTTP cache reuses a response with positive Cache-Control: max-age and a past Expires",
+    requests: [
+      {
+        response_headers: [
+          ["Cache-Control", "max-age=3600"],
+          ["Expires", -10000]
+        ]
+      },
+      {
+        expected_type: "cached"
+      }
+    ]
+  },
+  {
+    name: "HTTP cache reuses a response with positive Cache-Control: max-age and an invalid Expires",
+    requests: [
+      {
+        response_headers: [
+          ["Cache-Control", "max-age=3600"],
+          ["Expires", "0"]
+        ]
+      },
+      {
+        expected_type: "cached"
+      }
+    ]
+  },
+  {
+    name: "HTTP cache does not reuse a response with Cache-Control: max-age=0 and a future Expires",
+    requests: [
+      {
+        response_headers: [
+          ["Cache-Control", "max-age=0"],
+          ["Expires", 10000]
+        ]
+      },
+      {
+        expected_type: "not_cached"
+      }
+    ]
+  },
+  {
+    name: "HTTP cache does not prefer Cache-Control: s-maxage over Cache-Control: max-age",
+    requests: [
+      {
+        response_headers: [
+          ["Cache-Control", "max-age=1, s-maxage=3600"]
+        ],
+        pause_after: true,
+      },
+      {
+        expected_type: "not_cached"
+      }
+    ]
+  },
+  {
+    name: "HTTP cache does not reuse a response when the Age header is greater than its freshness lifetime",
+    requests: [
+      {
+        response_headers: [
+          ["Cache-Control", "max-age=3600"],
+          ["Age", "12000"]
+        ],
+      },
+      {
+        expected_type: "not_cached"
+      }
+    ]
+  },
+  {
+    name: "HTTP cache does not store a response with Cache-Control: no-store",
+    requests: [
+      {
+        response_headers: [
+          ["Cache-Control", "no-store"]
+        ]
+      },
+      {
+        expected_type: "not_cached"
+      }
+    ]
+  },
+  {
+    name: "HTTP cache does not store a response with Cache-Control: no-store, even with max-age and Expires",
+    requests: [
+      {
+        response_headers: [
+          ["Cache-Control", "max-age=10000, no-store"],
+          ["Expires", 10000]
+        ]
+      },
+      {
+        expected_type: "not_cached"
+      }
+    ]
+  },
+  {
+    name: "HTTP cache stores a response with Cache-Control: no-cache, but revalidates upon use",
+    requests: [
+      {
+        response_headers: [
+          ["Cache-Control", "no-cache"],
+          ["ETag", "abcd"]
+        ]
+      },
+      {
+        expected_type: "etag_validated"
+      }
+    ]
+  },
+  {
+    name: "HTTP cache stores a response with Cache-Control: no-cache, but revalidates upon use, even with max-age and Expires",
+    requests: [
+      {
+        response_headers: [
+          ["Cache-Control", "max-age=10000, no-cache"],
+          ["Expires", 10000],
+          ["ETag", "abcd"]
+        ]
+      },
+      {
+        expected_type: "etag_validated"
+      }
+    ]
+  },
+];
+run_tests(tests);
diff --git a/test/wpt/tests/fetch/http-cache/heuristic.any.js b/test/wpt/tests/fetch/http-cache/heuristic.any.js
new file mode 100644
index 00000000000..d8461318882
--- /dev/null
+++ b/test/wpt/tests/fetch/http-cache/heuristic.any.js
@@ -0,0 +1,93 @@
+// META: global=window,worker
+// META: title=HTTP Cache - Heuristic Freshness
+// META: timeout=long
+// META: script=/common/utils.js
+// META: script=/common/get-host-info.sub.js
+// META: script=http-cache.js
+
+var tests = [
+  {
+    name: "HTTP cache reuses an unknown response with Last-Modified based upon heuristic freshness when Cache-Control: public is present",
+    requests: [
+      {
+        response_status: [299, "Whatever"],
+        response_headers: [
+          ["Last-Modified", (-3 * 100)],
+          ["Cache-Control", "public"]
+        ],
+      },
+      {
+        expected_type: "cached",
+        response_status: [299, "Whatever"]
+      }
+    ]
+  },
+  {
+    name: "HTTP cache does not reuse an unknown response with Last-Modified based upon heuristic freshness when Cache-Control: public is not present",
+    requests: [
+      {
+        response_status: [299, "Whatever"],
+        response_headers: [
+          ["Last-Modified", (-3 * 100)]
+        ],
+      },
+      {
+        expected_type: "not_cached"
+      }
+    ]
+  }
+];
+
+function check_status(status) {
+  var succeed = status[0];
+  var code = status[1];
+  var phrase = status[2];
+  var body = status[3];
+  if (body === undefined) {
+    body = http_content(code);
+  }
+  var expected_type = "not_cached";
+  var desired = "does not use"
+  if (succeed === true) {
+    expected_type = "cached";
+    desired = "reuses";
+  }
+  tests.push(
+    {
+      name: "HTTP cache " + desired + " a " + code + " " + phrase + " response with Last-Modified based upon heuristic freshness",
+      requests: [
+        {
+          response_status: [code, phrase],
+          response_headers: [
+            ["Last-Modified", (-3 * 100)]
+          ],
+          response_body: body
+        },
+        {
+          expected_type: expected_type,
+          response_status: [code, phrase],
+          response_body: body
+        }
+      ]
+    }
+  )
+}
+[
+  [true, 200, "OK"],
+  [true, 203, "Non-Authoritative Information"],
+  [true, 204, "No Content", ""],
+  [true, 404, "Not Found"],
+  [true, 405, "Method Not Allowed"],
+  [true, 410, "Gone"],
+  [true, 414, "URI Too Long"],
+  [true, 501, "Not Implemented"]
+].forEach(check_status);
+[
+  [false, 201, "Created"],
+  [false, 202, "Accepted"],
+  [false, 403, "Forbidden"],
+  [false, 502, "Bad Gateway"],
+  [false, 503, "Service Unavailable"],
+  [false, 504, "Gateway Timeout"],
+].forEach(check_status);
+run_tests(tests);
diff --git a/test/wpt/tests/fetch/http-cache/http-cache.js b/test/wpt/tests/fetch/http-cache/http-cache.js
new file mode 100644
index 00000000000..19f1ca9b2bc
--- /dev/null
+++ b/test/wpt/tests/fetch/http-cache/http-cache.js
@@ -0,0 +1,274 @@
+/* global btoa fetch token promise_test step_timeout */
+/* global assert_equals assert_true assert_own_property assert_throws_js assert_less_than */
+
+const templates = {
+  'fresh': {
+    'response_headers': [
+      ['Expires', 100000],
+      ['Last-Modified', 0]
+    ]
+  },
+  'stale': {
+    'response_headers': [
+      ['Expires', -5000],
+      ['Last-Modified', -100000]
+    ]
+  },
+  'lcl_response': {
+    'response_headers': [
+      ['Location', 'location_target'],
+      ['Content-Location', 'content_location_target']
+    ]
+  },
+  'location': {
+    'query_arg': 'location_target',
+    'response_headers': [
+      ['Expires', 100000],
+      ['Last-Modified', 0]
+    ]
+  },
+  'content_location': {
+    'query_arg': 'content_location_target',
+    'response_headers': [
+      ['Expires', 100000],
+      ['Last-Modified', 0]
+    ]
+  }
+}
+
+const noBodyStatus = new Set([204, 304])
+
+function makeTest (test) {
+  return function () {
+    var uuid = token()
+    var requests = expandTemplates(test)
+    var fetchFunctions = makeFetchFunctions(requests, uuid)
+    return runTest(fetchFunctions, requests, uuid)
+  }
+}
+
+function makeFetchFunctions(requests, uuid) {
+    var fetchFunctions = []
+    for (let i = 0; i < requests.length; ++i) {
+      fetchFunctions.push({
+        code: function (idx) {
+          var config = requests[idx]
+          var url = makeTestUrl(uuid, config)
+          var init = fetchInit(requests, config)
+          return fetch(url, init)
+            .then(makeCheckResponse(idx, config))
+            .then(makeCheckResponseBody(config, uuid), function (reason) {
+              if ('expected_type' in config && config.expected_type === 'error') {
+                assert_throws_js(TypeError, function () { throw reason })
+              } else {
+                throw reason
+              }
+            })
+        },
+        pauseAfter: 'pause_after' in requests[i]
+      })
+    }
+    return fetchFunctions
+}
+
+function runTest(fetchFunctions, requests, uuid) {
+    var idx = 0
+    function runNextStep () {
+      if (fetchFunctions.length) {
+        var nextFetchFunction = fetchFunctions.shift()
+        if (nextFetchFunction.pauseAfter === true) {
+          return nextFetchFunction.code(idx++)
+            .then(pause)
+            .then(runNextStep)
+        } else {
+          return nextFetchFunction.code(idx++)
+            .then(runNextStep)
+        }
+      } else {
+        return Promise.resolve()
+      }
+    }
+
+    return runNextStep()
+      .then(function () {
+        return getServerState(uuid)
+      }).then(function (testState) {
+        checkRequests(requests, testState)
+        return Promise.resolve()
+      })
+}
+
+function expandTemplates (test) {
+  var rawRequests = test.requests
+  var requests = []
+  for (let i = 0; i < rawRequests.length; i++) {
+    var request = rawRequests[i]
+    request.name = test.name
+    if ('template' in request) {
+      var template = templates[request['template']]
+      for (let member in template) {
+        if (!request.hasOwnProperty(member)) {
+          request[member] = template[member]
+        }
+      }
+    }
+    requests.push(request)
+  }
+  return requests
+}
+
+function fetchInit (requests, config) {
+  var init = {
+    'headers': []
+  }
+  if ('request_method' in config) init.method = config['request_method']
+  // Note: init.headers must be a copy of config['request_headers'] array,
+  // because new elements are added later.
+  if ('request_headers' in config) init.headers = [...config['request_headers']];
+  if ('name' in config) init.headers.push(['Test-Name', config.name])
+  if ('request_body' in config) init.body = config['request_body']
+  if ('mode' in config) init.mode = config['mode']
+  if ('credentials' in config) init.credentials = config['credentials']
+  if ('cache' in config) init.cache = config['cache']
+  init.headers.push(['Test-Requests', btoa(JSON.stringify(requests))])
+  return init
+}
+
+function makeCheckResponse (idx, config) {
+  return function checkResponse (response) {
+    var reqNum = idx + 1
+    var resNum = parseInt(response.headers.get('Server-Request-Count'))
+    if ('expected_type' in config) {
+      if (config.expected_type === 'error') {
+        assert_true(false, `Request ${reqNum} doesn't throw an error`)
+        return response.text()
+      }
+      if (config.expected_type === 'cached') {
+        assert_less_than(resNum, reqNum, `Response ${reqNum} does not come from cache`)
+      }
+      if (config.expected_type === 'not_cached') {
+        assert_equals(resNum, reqNum, `Response ${reqNum} comes from cache`)
+      }
+    }
+    if ('expected_status' in config) {
+      assert_equals(response.status, config.expected_status,
+        `Response ${reqNum} status is ${response.status}, not ${config.expected_status}`)
+    } else if ('response_status' in config) {
+      assert_equals(response.status, config.response_status[0],
+        `Response ${reqNum} status is ${response.status}, not ${config.response_status[0]}`)
+    } else {
+      assert_equals(response.status, 200, `Response ${reqNum} status is ${response.status}, not 200`)
+    }
+    if ('response_headers' in config) {
+      config.response_headers.forEach(function (header) {
+        if (header.len < 3 || header[2] === true) {
+          assert_equals(response.headers.get(header[0]), header[1],
+            `Response ${reqNum} header ${header[0]} is "${response.headers.get(header[0])}", not "${header[1]}"`)
+        }
+      })
+    }
+    if ('expected_response_headers' in config) {
+      config.expected_response_headers.forEach(function (header) {
+        assert_equals(response.headers.get(header[0]), header[1],
+          `Response ${reqNum} header ${header[0]} is "${response.headers.get(header[0])}", not "${header[1]}"`)
+      })
+    }
+    return response.text()
+  }
+}
+
+function makeCheckResponseBody (config, uuid) {
+  return function checkResponseBody (resBody) {
+    var statusCode = 200
+    if ('response_status' in config) {
+      statusCode = config.response_status[0]
+    }
+    if ('expected_response_text' in config) {
+      if (config.expected_response_text !== null) {
+        assert_equals(resBody, config.expected_response_text,
+          `Response body is "${resBody}", not expected "${config.expected_response_text}"`)
+      }
+    } else if ('response_body' in config && config.response_body !== null) {
+      assert_equals(resBody, config.response_body,
+        `Response body is "${resBody}", not sent "${config.response_body}"`)
+    } else if (!noBodyStatus.has(statusCode)) {
+      assert_equals(resBody, uuid, `Response body is "${resBody}", not default "${uuid}"`)
+    }
+  }
+}
+
+function checkRequests (requests, testState) {
+  var testIdx = 0
+  for (let i = 0; i < requests.length; ++i) {
+    var expectedValidatingHeaders = []
+    var config = requests[i]
+    var serverRequest = testState[testIdx]
+    var reqNum = i + 1
+    if ('expected_type' in config) {
+      if (config.expected_type === 'cached') continue // the server will not see the request
+      if (config.expected_type === 'etag_validated') {
+        expectedValidatingHeaders.push('if-none-match')
+      }
+      if (config.expected_type === 'lm_validated') {
+        expectedValidatingHeaders.push('if-modified-since')
+      }
+    }
+    testIdx++
+    expectedValidatingHeaders.forEach(vhdr => {
+      assert_own_property(serverRequest.request_headers, vhdr,
+        `request ${reqNum} doesn't have ${vhdr} header`)
+    })
+    if ('expected_request_headers' in config) {
+      config.expected_request_headers.forEach(expectedHdr => {
+        assert_equals(serverRequest.request_headers[expectedHdr[0].toLowerCase()], expectedHdr[1],
+          `request ${reqNum} header ${expectedHdr[0]} value is "${serverRequest.request_headers[expectedHdr[0].toLowerCase()]}", not "${expectedHdr[1]}"`)
+      })
+    }
+  }
+}
+
+function pause () {
+  return new Promise(function (resolve, reject) {
+    step_timeout(function () {
+      return resolve()
+    }, 3000)
+  })
+}
+
+function makeTestUrl (uuid, config) {
+  var arg = ''
+  var base_url = ''
+  if ('base_url' in config) {
+    base_url = config.base_url
+  }
+  if ('query_arg' in config) {
+    arg = `&target=${config.query_arg}`
+  }
+  return `${base_url}resources/http-cache.py?dispatch=test&uuid=${uuid}${arg}`
+}
+
+function getServerState (uuid) {
+  return fetch(`resources/http-cache.py?dispatch=state&uuid=${uuid}`)
+    .then(function (response) {
+      return response.text()
+    }).then(function (text) {
+      return JSON.parse(text) || []
+    })
+}
+
+function run_tests (tests) {
+  tests.forEach(function (test) {
+    promise_test(makeTest(test), test.name)
+  })
+}
+
+var contentStore = {}
+function http_content (csKey) {
+  if (csKey in contentStore) {
+    return contentStore[csKey]
+  } else {
+    var content = btoa(Math.random() * Date.now())
+    contentStore[csKey] = content
+    return content
+  }
+}
diff --git a/test/wpt/tests/fetch/http-cache/invalidate.any.js b/test/wpt/tests/fetch/http-cache/invalidate.any.js
new file mode 100644
index 00000000000..9f8090ace65
--- /dev/null
+++ b/test/wpt/tests/fetch/http-cache/invalidate.any.js
@@ -0,0 +1,235 @@
+// META: global=window,worker
+// META: title=HTTP Cache - Invalidation
+// META: timeout=long
+// META: script=/common/utils.js
+// META: script=/common/get-host-info.sub.js
+// META: script=http-cache.js
+
+var tests = [
+  {
+    name: 'HTTP cache invalidates after a successful response from a POST',
+    requests: [
+      {
+        template: "fresh"
+      }, {
+        request_method: "POST",
+        request_body: "abc"
+      }, {
+        expected_type: "not_cached"
+      }
+    ]
+  },
+  {
+    name: 'HTTP cache does not invalidate after a failed response from an unsafe request',
+    requests: [
+      {
+        template: "fresh"
+      }, {
+        request_method: "POST",
+        request_body: "abc",
+        response_status: [500, "Internal Server Error"]
+      }, {
+        expected_type: "cached"
+      }
+    ]
+  },
+  {
+    name: 'HTTP cache invalidates after a successful response from a PUT',
+    requests: [
+      {
+        template: "fresh"
+      }, {
+        template: "fresh",
+        request_method: "PUT",
+        request_body: "abc"
+      }, {
+        expected_type: "not_cached"
+      }
+    ]
+  },
+  {
+    name: 'HTTP cache invalidates after a successful response from a DELETE',
+    requests: [
+      {
+        template: "fresh"
+      }, {
+        request_method: "DELETE",
+        request_body: "abc"
+      }, {
+        expected_type: "not_cached"
+      }
+    ]
+  },
+  {
+    name: 'HTTP cache invalidates after a successful response from an unknown method',
+    requests: [
+      {
+        template: "fresh"
+      }, {
+        request_method: "FOO",
+        request_body: "abc"
+      }, {
+        expected_type: "not_cached"
+      }
+    ]
+  },
+
+
+  {
+    name: 'HTTP cache invalidates Location URL after a successful response from a POST',
+    requests: [
+      {
+        template: "location"
+      }, {
+        request_method: "POST",
+        request_body: "abc",
+        template: "lcl_response"
+      }, {
+        template: "location",
+        expected_type: "not_cached"
+      }
+    ]
+  },
+  {
+    name: 'HTTP cache does not invalidate Location URL after a failed response from an unsafe request',
+    requests: [
+      {
+        template: "location"
+      }, {
+        template: "lcl_response",
+        request_method: "POST",
+        request_body: "abc",
+        response_status: [500, "Internal Server Error"]
+      }, {
+        template: "location",
+        expected_type: "cached"
+      }
+    ]
+  },
+  {
+    name: 'HTTP cache invalidates Location URL after a successful response from a PUT',
+    requests: [
+      {
+        template: "location"
+      }, {
+        template: "lcl_response",
+        request_method: "PUT",
+        request_body: "abc"
+      }, {
+        template: "location",
+        expected_type: "not_cached"
+      }
+    ]
+  },
+  {
+    name: 'HTTP cache invalidates Location URL after a successful response from a DELETE',
+    requests: [
+      {
+        template: "location"
+      }, {
+        template: "lcl_response",
+        request_method: "DELETE",
+        request_body: "abc"
+      }, {
+        template: "location",
+        expected_type: "not_cached"
+      }
+    ]
+  },
+  {
+    name: 'HTTP cache invalidates Location URL after a successful response from an unknown method',
+    requests: [
+      {
+        template: "location"
+      }, {
+        template: "lcl_response",
+        request_method: "FOO",
+        request_body: "abc"
+      }, {
+        template: "location",
+        expected_type: "not_cached"
+      }
+    ]
+  },
+
+
+
+  {
+    name: 'HTTP cache invalidates Content-Location URL after a successful response from a POST',
+    requests: [
+      {
+        template: "content_location"
+      }, {
+        request_method: "POST",
+        request_body: "abc",
+        template: "lcl_response"
+      }, {
+        template: "content_location",
+        expected_type: "not_cached"
+      }
+    ]
+  },
+  {
+    name: 'HTTP cache does not invalidate Content-Location URL after a failed response from an unsafe request',
+    requests: [
+      {
+        template: "content_location"
+      }, {
+        template: "lcl_response",
+        request_method: "POST",
+        request_body: "abc",
+        response_status: [500, "Internal Server Error"]
+      }, {
+        template: "content_location",
+        expected_type: "cached"
+      }
+    ]
+  },
+  {
+    name: 'HTTP cache invalidates Content-Location URL after a successful response from a PUT',
+    requests: [
+      {
+        template: "content_location"
+      }, {
+        template: "lcl_response",
+        request_method: "PUT",
+        request_body: "abc"
+      }, {
+        template: "content_location",
+        expected_type: "not_cached"
+      }
+    ]
+  },
+  {
+    name: 'HTTP cache invalidates Content-Location URL after a successful response from a DELETE',
+    requests: [
+      {
+        template: "content_location"
+      }, {
+        template: "lcl_response",
+        request_method: "DELETE",
+        request_body: "abc"
+      }, {
+        template: "content_location",
+        expected_type: "not_cached"
+      }
+    ]
+  },
+  {
+    name: 'HTTP cache invalidates Content-Location URL after a successful response from an unknown method',
+    requests: [
+      {
+        template: "content_location"
+      }, {
+        template: "lcl_response",
+        request_method: "FOO",
+        request_body: "abc"
+      }, {
+        template: "content_location",
+        expected_type: "not_cached"
+      }
+    ]
+  }
+
+];
+run_tests(tests);
diff --git a/test/wpt/tests/fetch/http-cache/partial.any.js b/test/wpt/tests/fetch/http-cache/partial.any.js
new file mode 100644
index 00000000000..3f23b5930f7
--- /dev/null
+++ b/test/wpt/tests/fetch/http-cache/partial.any.js
@@ -0,0 +1,208 @@
+// META: global=window,worker
+// META: title=HTTP Cache - Partial Content
+// META: timeout=long
+// META: script=/common/utils.js
+// META: script=/common/get-host-info.sub.js
+// META: script=http-cache.js
+
+var tests = [
+  {
+    name: "HTTP cache stores partial content and reuses it",
+    requests: [
+      {
+        request_headers: [
+          ['Range', "bytes=-5"]
+        ],
+        response_status: [206, "Partial Content"],
+        response_headers: [
+          ["Cache-Control", "max-age=3600"],
+          ["Content-Range", "bytes 4-9/10"]
+        ],
+        response_body: "01234",
+        expected_request_headers: [
+          ["Range", "bytes=-5"]
+        ]
+      },
+      {
+        request_headers: [
+          ["Range", "bytes=-5"]
+        ],
+        expected_type: "cached",
+        expected_status: 206,
+        expected_response_text: "01234"
+      }
+    ]
+  },
+  {
+    name: "HTTP cache stores complete response and serves smaller ranges from it (byte-range-spec)",
+    requests: [
+      {
+        response_headers: [
+          ["Cache-Control", "max-age=3600"]
+        ],
+        response_body: "01234567890"
+      },
+      {
+        request_headers: [
+          ['Range', "bytes=0-1"]
+        ],
+        expected_type: "cached",
+        expected_status: 206,
+        expected_response_text: "01"
+      },
+    ]
+  },
+  {
+    name: "HTTP cache stores complete response and serves smaller ranges from it (absent last-byte-pos)",
+    requests: [
+      {
+        response_headers: [
+          ["Cache-Control", "max-age=3600"],
+        ],
+        response_body: "01234567890"
+      },
+      {
+        request_headers: [
+          ['Range', "bytes=1-"]
+        ],
+        expected_type: "cached",
+        expected_status: 206,
+        expected_response_text: "1234567890"
+      }
+    ]
+  },
+  {
+    name: "HTTP cache stores complete response and serves smaller ranges from it (suffix-byte-range-spec)",
+    requests: [
+      {
+        response_headers: [
+          ["Cache-Control", "max-age=3600"],
+        ],
+        response_body: "0123456789A"
+      },
+      {
+        request_headers: [
+          ['Range', "bytes=-1"]
+        ],
+        expected_type: "cached",
+        expected_status: 206,
+        expected_response_text: "A"
+      }
+    ]
+  },
+  {
+    name: "HTTP cache stores complete response and serves smaller ranges from it with only-if-cached",
+    requests: [
+      {
+        response_headers: [
+          ["Cache-Control", "max-age=3600"]
+        ],
+        response_body: "01234567890"
+      },
+      {
+        request_headers: [
+          ['Range', "bytes=0-1"]
+        ],
+        mode: "same-origin",
+        cache: "only-if-cached",
+        expected_type: "cached",
+        expected_status: 206,
+        expected_response_text: "01"
+      },
+    ]
+  },
+  {
+    name: "HTTP cache stores partial response and serves smaller ranges from it (byte-range-spec)",
+    requests: [
+      {
+        request_headers: [
+          ['Range', "bytes=-5"]
+        ],
+        response_status: [206, "Partial Content"],
+        response_headers: [
+          ["Cache-Control", "max-age=3600"],
+          ["Content-Range", "bytes 4-9/10"]
+        ],
+        response_body: "01234"
+      },
+      {
+        request_headers: [
+          ['Range', "bytes=6-8"]
+        ],
+        expected_type: "cached",
+        expected_status: 206,
+        expected_response_text: "234"
+      }
+    ]
+  },
+  {
+    name: "HTTP cache stores partial response and serves smaller ranges from it (absent last-byte-pos)",
+    requests: [
+      {
+        request_headers: [
+          ['Range', "bytes=-5"]
+        ],
+        response_status: [206, "Partial Content"],
+        response_headers: [
+          ["Cache-Control", "max-age=3600"],
+          ["Content-Range", "bytes 4-9/10"]
+        ],
+        response_body: "01234"
+      },
+      {
+        request_headers: [
+          ["Range", "bytes=6-"]
+        ],
+        expected_type: "cached",
+        expected_status: 206,
+        expected_response_text: "234"
+      }
+    ]
+  },
+  {
+    name: "HTTP cache stores partial response and serves smaller ranges from it (suffix-byte-range-spec)",
+    requests: [
+      {
+        request_headers: [
+          ['Range', "bytes=-5"]
+        ],
+        response_status: [206, "Partial Content"],
+        response_headers: [
+          ["Cache-Control", "max-age=3600"],
+          ["Content-Range", "bytes 4-9/10"]
+        ],
+        response_body: "01234"
+      },
+      {
+        request_headers: [
+          ['Range', "bytes=-1"]
+        ],
+        expected_type: "cached",
+        expected_status: 206,
+        expected_response_text: "4"
+      }
+    ]
+  },
+  {
+    name: "HTTP cache stores partial content and completes it",
+    requests: [
+      {
+        request_headers: [
+          ['Range', "bytes=-5"]
+        ],
+        response_status: [206, "Partial Content"],
+        response_headers: [
+          ["Cache-Control", "max-age=3600"],
+          ["Content-Range", "bytes 0-4/10"]
+        ],
+        response_body: "01234"
+      },
+      {
+        expected_request_headers: [
+          ["range", "bytes=5-"]
+        ]
+      }
+    ]
+  },
+];
+run_tests(tests);
diff --git a/test/wpt/tests/fetch/http-cache/post-patch.any.js b/test/wpt/tests/fetch/http-cache/post-patch.any.js
new file mode 100644
index 00000000000..0a69baa5c66
--- /dev/null
+++ b/test/wpt/tests/fetch/http-cache/post-patch.any.js
@@ -0,0 +1,46 @@
+// META: global=window,worker
+// META: title=HTTP Cache - Caching POST and PATCH responses
+// META: timeout=long
+// META: script=/common/utils.js
+// META: script=/common/get-host-info.sub.js
+// META: script=http-cache.js
+
+var tests = [
+  {
+    name: "HTTP cache uses content after PATCH request with response containing Content-Location and cache-allowing header",
+    requests: [
+      {
+        request_method: "PATCH",
+        request_body: "abc",
+        response_status: [200, "OK"],
+        response_headers: [
+          ['Cache-Control', "private, max-age=1000"],
+          ['Content-Location', ""]
+        ],
+        response_body: "abc"
+      },
+      {
+        expected_type: "cached"
+      }
+    ]
+  },
+  {
+    name: "HTTP cache uses content after POST request with response containing Content-Location and cache-allowing header",
+    requests: [
+      {
+        request_method: "POST",
+        request_body: "abc",
+        response_status: [200, "OK"],
+        response_headers: [
+          ['Cache-Control', "private, max-age=1000"],
+          ['Content-Location', ""]
+        ],
+        response_body: "abc"
+      },
+      {
+        expected_type: "cached"
+      }
+    ]
+  }
+];
+run_tests(tests);
diff --git a/test/wpt/tests/fetch/http-cache/resources/http-cache.py b/test/wpt/tests/fetch/http-cache/resources/http-cache.py
new file mode 100644
index 00000000000..3ab610dd142
--- /dev/null
+++ b/test/wpt/tests/fetch/http-cache/resources/http-cache.py
@@ -0,0 +1,124 @@
+import datetime
+import json
+import time
+from base64 import b64decode
+
+from wptserve.utils import isomorphic_decode, isomorphic_encode
+
+NOTEHDRS = set([u'content-type', u'access-control-allow-origin', u'last-modified', u'etag'])
+NOBODYSTATUS = set([204, 304])
+LOCATIONHDRS = set([u'location', u'content-location'])
+DATEHDRS = set([u'date', u'expires', u'last-modified'])
+
+def main(request, response):
+    dispatch = request.GET.first(b"dispatch", None)
+    uuid = request.GET.first(b"uuid", None)
+    response.headers.set(b"Access-Control-Allow-Credentials", b"true")
+
+    if request.method == u"OPTIONS":
+        return handle_preflight(uuid, request, response)
+    if not uuid:
+        response.status = (404, b"Not Found")
+        response.headers.set(b"Content-Type", b"text/plain")
+        return b"UUID not found"
+    if dispatch == b'test':
+        return handle_test(uuid, request, response)
+    elif dispatch == b'state':
+        return handle_state(uuid, request, response)
+    response.status = (404, b"Not Found")
+    response.headers.set(b"Content-Type", b"text/plain")
+    return b"Fallthrough"
+
+def handle_preflight(uuid, request, response):
+    response.status = (200, b"OK")
+    response.headers.set(b"Access-Control-Allow-Origin", request.headers.get(b"origin") or '*')
+    response.headers.set(b"Access-Control-Allow-Methods", b"GET")
+    response.headers.set(b"Access-Control-Allow-Headers", request.headers.get(b"Access-Control-Request-Headers") or "*")
+    response.headers.set(b"Access-Control-Max-Age", b"86400")
+    return b"Preflight request"
+
+def handle_state(uuid, request, response):
+    response.headers.set(b"Content-Type", b"text/plain")
+    return json.dumps(request.server.stash.take(uuid))
+
+def handle_test(uuid, request, response):
+    server_state = request.server.stash.take(uuid) or []
+    try:
+        requests = json.loads(b64decode(request.headers.get(b'Test-Requests', b"")))
+    except:
+        response.status = (400, b"Bad Request")
+        response.headers.set(b"Content-Type", b"text/plain")
+        return b"No or bad Test-Requests request header"
+    config = requests[len(server_state)]
+    if not config:
+        response.status = (404, b"Not Found")
+        response.headers.set(b"Content-Type", b"text/plain")
+        return b"Config not found"
+    noted_headers = {}
+    now = time.time()
+    for header in config.get(u'response_headers', []):
+        if header[0].lower() in LOCATIONHDRS: # magic locations
+            if (len(header[1]) > 0):
+                header[1] = u"%s&target=%s" % (request.url, header[1])
+            else:
+                header[1] = request.url
+        if header[0].lower() in DATEHDRS and isinstance(header[1], int):  # magic dates
+            header[1] = http_date(now, header[1])
+        response.headers.set(isomorphic_encode(header[0]), isomorphic_encode(header[1]))
+        if header[0].lower() in NOTEHDRS:
+            noted_headers[header[0].lower()] = header[1]
+    state = {
+        u'now': now,
+        u'request_method': request.method,
+        u'request_headers': dict([[isomorphic_decode(h.lower()), isomorphic_decode(request.headers[h])] for h in request.headers]),
+        u'response_headers': noted_headers
+    }
+    server_state.append(state)
+    request.server.stash.put(uuid, server_state)
+
+    if u"access-control-allow-origin" not in noted_headers:
+        response.headers.set(b"Access-Control-Allow-Origin", b"*")
+    if u"content-type" not in noted_headers:
+        response.headers.set(b"Content-Type", b"text/plain")
+    response.headers.set(b"Server-Request-Count", len(server_state))
+
+    code, phrase = config.get(u"response_status", [200, b"OK"])
+    if config.get(u"expected_type", u"").endswith(u'validated'):
+        ref_hdrs = server_state[0][u'response_headers']
+        previous_lm = ref_hdrs.get(u'last-modified', False)
+        if previous_lm and request.headers.get(b"If-Modified-Since", False) == isomorphic_encode(previous_lm):
+            code, phrase = [304, b"Not Modified"]
+        previous_etag = ref_hdrs.get(u'etag', False)
+        if previous_etag and request.headers.get(b"If-None-Match", False) == isomorphic_encode(previous_etag):
+            code, phrase = [304, b"Not Modified"]
+        if code != 304:
+            code, phrase = [999, b'304 Not Generated']
+    response.status = (code, phrase)
+
+    content = config.get(u"response_body", uuid)
+    if code in NOBODYSTATUS:
+        return b""
+    return content
+
+
+def get_header(headers, header_name):
+    result = None
+    for header in headers:
+        if header[0].lower() == header_name.lower():
+            result = header[1]
+    return result
+
+WEEKDAYS = [u'Mon', u'Tue', u'Wed', u'Thu', u'Fri', u'Sat', u'Sun']
+MONTHS = [None, u'Jan', u'Feb', u'Mar', u'Apr', u'May', u'Jun', u'Jul',
+          u'Aug', u'Sep', u'Oct', u'Nov', u'Dec']
+
+def http_date(now, delta_secs=0):
+    date = datetime.datetime.utcfromtimestamp(now + delta_secs)
+    return u"%s, %.2d %s %.4d %.2d:%.2d:%.2d GMT" % (
+        WEEKDAYS[date.weekday()],
+        date.day,
+        MONTHS[date.month],
+        date.year,
+        date.hour,
+        date.minute,
+        date.second)
diff --git a/test/wpt/tests/fetch/http-cache/resources/securedimage.py b/test/wpt/tests/fetch/http-cache/resources/securedimage.py
new file mode 100644
index 00000000000..cac9cfedd27
--- /dev/null
+++ b/test/wpt/tests/fetch/http-cache/resources/securedimage.py
@@ -0,0 +1,19 @@
+# -*- coding: utf-8 -
+
+from wptserve.utils import isomorphic_decode, isomorphic_encode
+
+def main(request, response):
+    image_url = str.replace(request.url, u"fetch/http-cache/resources/securedimage.py", u"images/green.png")
+
+    if b"authorization" not in request.headers:
+        response.status = 401
+        response.headers.set(b"WWW-Authenticate", b"Basic")
+        return
+    else:
+        auth = request.headers.get(b"Authorization")
+        if auth != b"Basic dGVzdHVzZXI6dGVzdHBhc3M=":
+            response.set_error(403, u"Invalid username or password - " + isomorphic_decode(auth))
+            return
+
+    response.status = 301
+    response.headers.set(b"Location", isomorphic_encode(image_url))
diff --git a/test/wpt/tests/fetch/http-cache/resources/split-cache-popup-with-iframe.html b/test/wpt/tests/fetch/http-cache/resources/split-cache-popup-with-iframe.html
new file mode 100644
index 00000000000..48b16180cfd
--- /dev/null
+++ b/test/wpt/tests/fetch/http-cache/resources/split-cache-popup-with-iframe.html
@@ -0,0 +1,34 @@
+<!doctype html>
+<html>
+<head>
+  <meta charset="utf-8">
+  <title>HTTP Cache - helper</title>
+  <meta name="help" href="https://fetch.spec.whatwg.org/#http-cache-partitions">
+  <meta name="timeout" content="normal">
+  <script src="/resources/testharness.js"></script>
+  <script src="/common/get-host-info.sub.js"></script>
+</head>
+<body>
+<script>
+  const host = get_host_info();
+
+  // Create iframe that is same-origin to the opener.
+  var iframe = document.createElement("iframe");
+  iframe.src = host.HTTP_ORIGIN + window.location.pathname.replace(/\/[^\/]*$/, '/') + "split-cache-popup.html";
+  document.body.appendChild(iframe);
+
+  window.addEventListener("message", function listener(event) {
+    if (event.origin !== host.HTTP_ORIGIN) {
+      // Ignore messages not from the iframe or opener
+      return;
+    } else if (typeof(event.data) === "object") {
+      // This message came from the opener, pass it on to the iframe
+      iframe.contentWindow.postMessage(event.data, host.HTTP_ORIGIN);
+    } else if (typeof(event.data) === "string") {
+      // This message came from the iframe, pass it on to the opener
+      window.opener.postMessage(event.data, host.HTTP_ORIGIN);
+    }
+  })
+</script>
+</body>
+</html>
diff --git a/test/wpt/tests/fetch/http-cache/resources/split-cache-popup.html b/test/wpt/tests/fetch/http-cache/resources/split-cache-popup.html
new file mode 100644
index 00000000000..edb57947941
--- /dev/null
+++ b/test/wpt/tests/fetch/http-cache/resources/split-cache-popup.html
@@ -0,0 +1,28 @@
+<!doctype html>
+<html>
+<head>
+  <meta charset="utf-8">
+  <title>HTTP Cache - helper</title>
+  <meta name="help" href="https://fetch.spec.whatwg.org/#http-cache-partitions">
+  <meta name="timeout" content="normal">
+  <script src="/resources/testharness.js"></script>
+  <script src="../http-cache.js"></script>
+</head>
+<body>
+<script>
+   window.addEventListener("message", function listener(event) {
+      window.removeEventListener("message", listener)
+
+      var fetchFunction = makeFetchFunctions(event.data.requests, event.data.uuid)[event.data.index]
+      fetchFunction.code(event.data.index).then(
+         function(response) {
+            event.source.postMessage("success", event.origin)
+         },
+         function(response) {
+            event.source.postMessage("error", event.origin)
+         }
+      )
+   })
+</script>
+</body>
+</html>
diff --git a/test/wpt/tests/fetch/http-cache/split-cache.html b/test/wpt/tests/fetch/http-cache/split-cache.html
new file mode 100644
index 00000000000..fe93d2e3400
--- /dev/null
+++ b/test/wpt/tests/fetch/http-cache/split-cache.html
@@ -0,0 +1,158 @@
+<!doctype html>
+<html>
+<head>
+  <meta charset="utf-8">
+  <title>HTTP Cache - Partioning by site</title>
+  <meta name="help" href="https://fetch.spec.whatwg.org/#http-cache-partitions">
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  <script src="/common/utils.js"></script>
+  <script src="/common/get-host-info.sub.js"></script>
+  <script src="http-cache.js"></script>
+</head>
+<body>
+<script>
+const host = get_host_info();
+
+// We run this entire test four times, varying the following two booleans:
+// - is_cross_site_test, which controls whether the popup is cross-site.
+// - load_resource_in_iframe, which controls whether the popup loads the
+//     resource in an iframe or the top-level frame. Note that the iframe is
+//     always same-site to the opener.
+function performFullTest(is_cross_site_test, load_resource_in_iframe, name) {
+  const POPUP_HTTP_ORIGIN = is_cross_site_test ? host.HTTP_NOTSAMESITE_ORIGIN : host.HTTP_ORIGIN
+  const LOCAL_HTTP_ORIGIN = host.HTTP_ORIGIN
+
+  const popupBaseURL = POPUP_HTTP_ORIGIN + window.location.pathname.replace(/\/[^\/]*$/, '/') ;
+  const localBaseURL = LOCAL_HTTP_ORIGIN + window.location.pathname.replace(/\/[^\/]*$/, '/') ;
+
+  // Note: Navigation requests are requested with credentials. Make sure the
+  // fetch requests are also requested with credentials. This ensures passing
+  // this test is not simply the consequence of discriminating anonymous and
+  // credentialled request in the HTTP cache.
+  //
+  // See https://github.com/whatwg/fetch/issues/1253
+  var test = {
+    requests: [
+      {
+        response_headers: [
+          ["Expires", (30 * 24 * 60 * 60)],
+          ["Access-Control-Allow-Origin", POPUP_HTTP_ORIGIN],
+        ],
+        base_url: localBaseURL,
+        credentials: "include",
+      },
+      {
+        response_headers: [
+          ["Access-Control-Allow-Origin", POPUP_HTTP_ORIGIN],
+        ],
+        base_url: localBaseURL,
+        credentials: "include",
+      },
+      {
+        request_headers: [
+          ["Cache-Control", "no-cache"]
+        ],
+        response_headers: [
+          ["Access-Control-Allow-Origin", POPUP_HTTP_ORIGIN],
+        ],
+        // If the popup's request was a cache hit, we would only expect 2
+        // requests to the server. If it was a cache miss, we would expect 3.
+        // load_resource_in_iframe does not affect the expectation as, even
+        // though the iframe (if present) is same-site, we expect a cache miss
+        // when the popup's top-level frame is a different site.
+        expected_response_headers: [
+          ["server-request-count", is_cross_site_test ? "3" : "2"]
+        ],
+        base_url: localBaseURL,
+        credentials: "include",
+      }
+    ]
+  }
+
+  var uuid = token()
+  var local_requests = expandTemplates(test)
+  var fetchFns = makeFetchFunctions(local_requests, uuid)
+
+  var popup_requests = expandTemplates(test)
+
+  // Request the resource with a long cache expiry
+  function local_fetch() {
+    return fetchFns[0].code(0)
+  }
+
+  function popup_fetch() {
+    return new Promise(function(resolve, reject) {
+      var relativeUrl = load_resource_in_iframe
+          ? "resources/split-cache-popup-with-iframe.html"
+          : "resources/split-cache-popup.html";
+      var win = window.open(popupBaseURL + relativeUrl);
+
+      // Post a message to initiate the popup's request and give the necessary
+      // information. Posted repeatedly to account for dropped messages as the
+      // popup is loading.
+      function postMessage(event) {
+        var payload = {
+          index: 1,
+          requests: popup_requests,
+          uuid: uuid
+        }
+        win.postMessage(payload, POPUP_HTTP_ORIGIN)
+      }
+      var messagePoster = setInterval(postMessage, 100)
+
+      // Listen for the result
+      function messageListener(event) {
+        if (event.origin !== POPUP_HTTP_ORIGIN) {
+          reject("Unknown error")
+        } else if (event.data === "success") {
+          resolve()
+        } else if (event.data === "error") {
+          reject("Error in popup")
+        } else {
+          return; // Ignore testharness.js internal messages
+        }
+        window.removeEventListener("message", messageListener)
+        clearInterval(messagePoster)
+        win.close()
+      }
+      window.addEventListener("message", messageListener)
+    })
+  }
+
+  function local_fetch2() {
+    return fetchFns[2].code(2)
+  }
+
+  // Final checks.
+  function check_server_info() {
+    return getServerState(uuid)
+      .then(function (testState) {
+        checkRequests(local_requests, testState)
+        return Promise.resolve()
+      })
+  }
+
+  promise_test(() => {
+    return local_fetch()
+      .then(popup_fetch)
+      .then(local_fetch2)
+      .then(check_server_info)
+  }, name)
+}
+
+performFullTest(
+  false /* is_cross_site_test */, false /* load_resource_in_iframe */,
+  "HTTP cache is shared between same-site top-level frames");
+performFullTest(
+  true /* is_cross_site_test */, false /* load_resource_in_iframe */,
+  "HTTP cache is not shared between cross-site top-level frames");
+performFullTest(
+  false /* is_cross_site_test */, true /* load_resource_in_iframe */,
+  "HTTP cache is shared between same-site frames with same-site top-level frames");
+performFullTest(
+  true /* is_cross_site_test */, true /* load_resource_in_iframe */,
+  "HTTP cache is not shared between same-site frames with cross-site top-level frames");
+</script>
+</body>
+</html>
diff --git a/test/wpt/tests/fetch/http-cache/status.any.js b/test/wpt/tests/fetch/http-cache/status.any.js
new file mode 100644
index 00000000000..10c83a25a26
--- /dev/null
+++ b/test/wpt/tests/fetch/http-cache/status.any.js
@@ -0,0 +1,60 @@
+// META: global=window,worker
+// META: title=HTTP Cache - Status Codes
+// META: timeout=long
+// META: script=/common/utils.js
+// META: script=/common/get-host-info.sub.js
+// META: script=http-cache.js
+
+var tests = [];
+function check_status(status) {
+  var code = status[0];
+  var phrase = status[1];
+  var body = status[2];
+  if (body === undefined) {
+    body = http_content(code);
+  }
+  tests.push({
+    name: "HTTP cache goes to the network if it has a stale " + code + " response",
+    requests: [
+      {
+        template: "stale",
+        response_status: [code, phrase],
+        response_body: body
+      }, {
+        expected_type: "not_cached",
+        response_status: [code, phrase],
+        response_body: body
+      }
+    ]
+  })
+  tests.push({
+    name: "HTTP cache avoids going to the network if it has a fresh " + code + " response",
+    requests: [
+      {
+        template: "fresh",
+        response_status: [code, phrase],
+        response_body: body
+      }, {
+        expected_type: "cached",
+        response_status: [code, phrase],
+        response_body: body
+      }
+    ]
+  })
+}
+[
+  [200, "OK"],
+  [203, "Non-Authoritative Information"],
+  [204, "No Content", null],
+  [299, "Whatever"],
+  [400, "Bad Request"],
+  [404, "Not Found"],
+  [410, "Gone"],
+  [499, "Whatever"],
+  [500, "Internal Server Error"],
+  [502, "Bad Gateway"],
+  [503, "Service Unavailable"],
+  [504, "Gateway Timeout"],
+  [599, "Whatever"]
+].forEach(check_status);
+run_tests(tests);
diff --git a/test/wpt/tests/fetch/http-cache/vary.any.js b/test/wpt/tests/fetch/http-cache/vary.any.js
new file mode 100644
index 00000000000..2cfd226af81
--- /dev/null
+++ b/test/wpt/tests/fetch/http-cache/vary.any.js
@@ -0,0 +1,313 @@
+// META: global=window,worker
+// META: title=HTTP Cache - Vary
+// META: timeout=long
+// META: script=/common/utils.js
+// META: script=/common/get-host-info.sub.js
+// META: script=http-cache.js
+
+var tests = [
+  {
+    name: "HTTP cache reuses Vary response when request matches",
+    requests: [
+      {
+        request_headers: [
+          ["Foo", "1"]
+        ],
+        response_headers: [
+          ["Expires", 5000],
+          ["Last-Modified", -3000],
+          ["Vary", "Foo"]
+        ]
+      },
+      {
+        request_headers: [
+          ["Foo", "1"]
+        ],
+        expected_type: "cached"
+      }
+    ]
+  },
+  {
+    name: "HTTP cache doesn't use Vary response when request doesn't match",
+    requests: [
+      {
+        request_headers: [
+          ["Foo", "1"]
+        ],
+        response_headers: [
+          ["Expires", 5000],
+          ["Last-Modified", -3000],
+          ["Vary", "Foo"]
+        ]
+      },
+      {
+        request_headers: [
+          ["Foo", "2"]
+        ],
+        expected_type: "not_cached"
+      }
+    ]
+  },
+  {
+    name: "HTTP cache doesn't use Vary response when request omits variant header",
+    requests: [
+      {
+        request_headers: [
+          ["Foo", "1"]
+        ],
+        response_headers: [
+          ["Expires", 5000],
+          ["Last-Modified", -3000],
+          ["Vary", "Foo"]
+        ]
+      },
+      {
+        expected_type: "not_cached"
+      }
+    ]
+  },
+  {
+    name: "HTTP cache doesn't invalidate existing Vary response",
+    requests: [
+      {
+        request_headers: [
+          ["Foo", "1"]
+        ],
+        response_headers: [
+          ["Expires", 5000],
+          ["Last-Modified", -3000],
+          ["Vary", "Foo"]
+        ],
+        response_body: http_content('foo_1')
+      },
+      {
+        request_headers: [
+          ["Foo", "2"]
+        ],
+        response_headers: [
+          ["Expires", 5000],
+          ["Last-Modified", -3000],
+          ["Vary", "Foo"]
+        ],
+        expected_type: "not_cached",
+        response_body: http_content('foo_2'),
+      },
+      {
+        request_headers: [
+          ["Foo", "1"]
+        ],
+        response_body: http_content('foo_1'),
+        expected_type: "cached"
+      }
+    ]
+  },
+  {
+    name: "HTTP cache doesn't pay attention to headers not listed in Vary",
+    requests: [
+      {
+        request_headers: [
+          ["Foo", "1"],
+          ["Other", "2"]
+        ],
+        response_headers: [
+          ["Expires", 5000],
+          ["Last-Modified", -3000],
+          ["Vary", "Foo"]
+        ],
+      },
+      {
+        request_headers: [
+          ["Foo", "1"],
+          ["Other", "3"]
+        ],
+        expected_type: "cached"
+      }
+    ]
+  },
+  {
+    name: "HTTP cache reuses two-way Vary response when request matches",
+    requests: [
+      {
+        request_headers: [
+          ["Foo", "1"],
+          ["Bar", "abc"]
+        ],
+        response_headers: [
+          ["Expires", 5000],
+          ["Last-Modified", -3000],
+          ["Vary", "Foo, Bar"]
+        ]
+      },
+      {
+        request_headers: [
+          ["Foo", "1"],
+          ["Bar", "abc"]
+        ],
+        expected_type: "cached"
+      }
+    ]
+  },
+  {
+    name: "HTTP cache doesn't use two-way Vary response when request doesn't match",
+    requests: [
+      {
+        request_headers: [
+          ["Foo", "1"],
+          ["Bar", "abc"]
+        ],
+        response_headers: [
+          ["Expires", 5000],
+          ["Last-Modified", -3000],
+          ["Vary", "Foo, Bar"]
+        ]
+      },
+      {
+        request_headers: [
+          ["Foo", "2"],
+          ["Bar", "abc"]
+        ],
+        expected_type: "not_cached"
+      }
+    ]
+  },
+  {
+    name: "HTTP cache doesn't use two-way Vary response when request omits variant header",
+    requests: [
+      {
+        request_headers: [
+          ["Foo", "1"]
+        ],
+        response_headers: [
+          ["Expires", 5000],
+          ["Last-Modified", -3000],
+          ["Vary", "Foo, Bar"]
+        ]
+      },
+      {
+        expected_type: "not_cached"
+      }
+    ]
+  },
+  {
+    name: "HTTP cache reuses three-way Vary response when request matches",
+    requests: [
+      {
+        request_headers: [
+          ["Foo", "1"],
+          ["Bar", "abc"],
+          ["Baz", "789"]
+        ],
+        response_headers: [
+          ["Expires", 5000],
+          ["Last-Modified", -3000],
+          ["Vary", "Foo, Bar, Baz"]
+        ]
+      },
+      {
+        request_headers: [
+          ["Foo", "1"],
+          ["Bar", "abc"],
+          ["Baz", "789"]
+        ],
+        expected_type: "cached"
+      }
+    ]
+  },
+  {
+    name: "HTTP cache doesn't use three-way Vary response when request doesn't match",
+    requests: [
+      {
+        request_headers: [
+          ["Foo", "1"],
+          ["Bar", "abc"],
+          ["Baz", "789"]
+        ],
+        response_headers: [
+          ["Expires", 5000],
+          ["Last-Modified", -3000],
+          ["Vary", "Foo, Bar, Baz"]
+        ]
+      },
+      {
+        request_headers: [
+          ["Foo", "2"],
+          ["Bar", "abc"],
+          ["Baz", "789"]
+        ],
+        expected_type: "not_cached"
+      }
+    ]
+  },
+  {
+    name: "HTTP cache doesn't use three-way Vary response when request doesn't match, regardless of header order",
+    requests: [
+      {
+        request_headers: [
+          ["Foo", "1"],
+          ["Bar", "abc4"],
+          ["Baz", "789"]
+        ],
+        response_headers: [
+          ["Expires", 5000],
+          ["Last-Modified", -3000],
+          ["Vary", "Foo, Bar, Baz"]
+        ]
+      },
+      {
+        request_headers: [
+          ["Foo", "1"],
+          ["Bar", "abc"],
+          ["Baz", "789"]
+        ],
+        expected_type: "not_cached"
+      }
+    ]
+  },
+  {
+    name: "HTTP cache uses three-way Vary response when both request and the original request omited a variant header",
+    requests: [
+      {
+        request_headers: [
+          ["Foo", "1"],
+          ["Baz", "789"]
+        ],
+        response_headers: [
+          ["Expires", 5000],
+          ["Last-Modified", -3000],
+          ["Vary", "Foo, Bar, Baz"]
+        ]
+      },
+      {
+        request_headers: [
+          ["Foo", "1"],
+          ["Baz", "789"]
+        ],
+        expected_type: "cached"
+      }
+    ]
+  },
+  {
+    name: "HTTP cache doesn't use Vary response with a field value of '*'",
+    requests: [
+      {
+        request_headers: [
+          ["Foo", "1"],
+          ["Baz", "789"]
+        ],
+        response_headers: [
+          ["Expires", 5000],
+          ["Last-Modified", -3000],
+          ["Vary", "*"]
+        ]
+      },
+      {
+        request_headers: [
+          ["*", "1"],
+          ["Baz", "789"]
+        ],
+        expected_type: "not_cached"
+      }
+    ]
+  }
+];
+run_tests(tests);
diff --git a/test/wpt/tests/fetch/images/canvas-remote-read-remote-image-redirect.html b/test/wpt/tests/fetch/images/canvas-remote-read-remote-image-redirect.html
new file mode 100644
index 00000000000..4a887f3d331
--- /dev/null
+++ b/test/wpt/tests/fetch/images/canvas-remote-read-remote-image-redirect.html
@@ -0,0 +1,28 @@
+<!doctype html>
+<meta charset=utf-8>
+<title>Load a no-cors image from a same-origin URL that redirects to a cross-origin URL that redirects to the initial origin</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/common/get-host-info.sub.js"></script>
+<script>
+setup({ single_test: true });
+var image = new Image();
+image.onload = function() {
+    const canvas = document.createElement("canvas");
+    canvas.width = 100;
+    canvas.height = 100;
+
+    const context = canvas.getContext("2d");
+    context.drawImage(image, 0, 0, 100, 100);
+
+    assert_throws_dom("SecurityError", () => {
+        context.getImageData(0, 0, 100, 100);
+    });
+    done();
+}
+
+const info = get_host_info();
+const finalURL = get_host_info().HTTP_ORIGIN + "/images/apng.png";
+const intermediateURL = get_host_info().HTTP_REMOTE_ORIGIN + "/fetch/api/resources/redirect.py?location=" + finalURL;
+image.src = "/fetch/api/resources/redirect.py?location=" + encodeURIComponent(intermediateURL);
+</script>
diff --git a/test/wpt/tests/fetch/metadata/META.yml b/test/wpt/tests/fetch/metadata/META.yml
new file mode 100644
index 00000000000..85f0a7d2ee1
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/META.yml
@@ -0,0 +1,4 @@
+spec: https://w3c.github.io/webappsec-fetch-metadata/
+suggested_reviewers:
+  - mikewest
+  - iVanlIsh
diff --git a/test/wpt/tests/fetch/metadata/README.md b/test/wpt/tests/fetch/metadata/README.md
new file mode 100644
index 00000000000..34864d4a4b6
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/README.md
@@ -0,0 +1,9 @@
+Fetch Metadata Tests
+====================
+
+This directory contains tests related to the Fetch Metadata proposal:
+
+:   Explainer
+::  <https://github.com/w3c/webappsec-fetch-metadata>
+:   "Spec"
+::  <https://w3c.github.io/webappsec-fetch-metadata/>
diff --git a/test/wpt/tests/fetch/metadata/audio-worklet.https.html b/test/wpt/tests/fetch/metadata/audio-worklet.https.html
new file mode 100644
index 00000000000..3b768ef0b5d
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/audio-worklet.https.html
@@ -0,0 +1,20 @@
+<!DOCTYPE html>
+
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=/fetch/metadata/resources/helper.js></script>
+<script src=/common/utils.js></script>
+<script>
+
+  promise_test(async t => {
+    const nonce = token();
+    const key = "worklet-destination" + nonce;
+    const context = new AudioContext();
+
+    await context.audioWorklet.addModule("/fetch/metadata/resources/record-header.py?file=" + key);
+    const expected = {"site": "same-origin", "user": "", "mode": "cors", "dest": "audioworklet"};
+    await validate_expectations(key, expected);
+  }, "The fetch metadata for audio worklet");
+
+</script>
+<body></body>
diff --git a/test/wpt/tests/fetch/metadata/embed.https.sub.tentative.html b/test/wpt/tests/fetch/metadata/embed.https.sub.tentative.html
new file mode 100644
index 00000000000..1900dbdf081
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/embed.https.sub.tentative.html
@@ -0,0 +1,63 @@
+<!DOCTYPE html>
+<meta charset="utf-8"/>
+<link rel="author" href="mtrzos@google.com" title="Maciek Trzos">
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=/fetch/metadata/resources/helper.js></script>
+<script src=/common/utils.js></script>
+<body>
+
+<p>Relevant issue: <a href="https://github.com/whatwg/html/issues/513">
+&lt;embed> should support loading random HTML documents, like &lt;object>
+</a></p>
+
+<script>
+  const nonce = token();
+
+  const origins = {
+    "same-origin": "https://{{host}}:{{ports[https][0]}}",
+    "same-site":   "https://{{hosts[][www]}}:{{ports[https][0]}}",
+    "cross-site":  "https://{{hosts[alt][www]}}:{{ports[https][0]}}",
+  };
+
+  for (let site in origins) {
+    promise_test(t => {
+      return new Promise((resolve, reject) => {
+        let key = "embed-" + site + "-" + nonce;
+
+        let el = document.createElement('embed');
+        el.src = origins[site] + "/fetch/metadata/resources/record-header.py?file=" + key;
+        el.onload = _ => {
+          let expected = {"dest": "embed", "site": site, "user": "", "mode": "navigate"};
+          validate_expectations(key, expected, site + " embed")
+            .then(resolve)
+            .catch(reject);
+        };
+
+        document.body.appendChild(el);
+      })
+    }, "Wrapper: " + site + " embed");
+
+    promise_test(t => {
+      return new Promise((resolve, reject) => {
+        let key = "post-embed-" + site + "-" + nonce;
+
+        let el = document.createElement('embed');
+        el.src = "/common/blank.html";
+        el.addEventListener("load", _ => {
+          el.addEventListener("load", _ => {
+            let expected = {"dest": "embed", "site": site, "user":"", "mode":"navigate"};
+            validate_expectations(key, expected, "Navigate to " + site + " embed")
+              .then(resolve)
+              .catch(reject);
+          }, { once: true });
+
+          // Navigate the existing `<embed>`
+          window.frames[window.length - 1].location = origins[site] + "/fetch/metadata/resources/record-header.py?file=" + key;
+        }, { once: true });
+
+        document.body.appendChild(el);
+      })
+    }, "Wrapper: Navigate to " + site + " embed");
+  }
+</script>
diff --git a/test/wpt/tests/fetch/metadata/fetch-preflight.https.sub.any.js b/test/wpt/tests/fetch/metadata/fetch-preflight.https.sub.any.js
new file mode 100644
index 00000000000..d52474353ba
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/fetch-preflight.https.sub.any.js
@@ -0,0 +1,29 @@
+// META: global=window,worker
+// META: script=/fetch/metadata/resources/helper.js
+
+// Site
+promise_test(t => {
+  return validate_expectations_custom_url("https://{{hosts[][www]}}:{{ports[https][0]}}/fetch/metadata/resources/echo-as-json.py",
+                {
+                  mode: "cors",
+                  headers: { 'x-test': 'testing' }
+                }, {
+          "site": "same-site",
+          "user": "",
+          "mode": "cors",
+          "dest": "empty"
+        }, "Same-site fetch with preflight");
+}, "Same-site fetch with preflight");
+
+promise_test(t => {
+  return validate_expectations_custom_url("https://{{hosts[alt][www]}}:{{ports[https][0]}}/fetch/metadata/resources/echo-as-json.py",
+                {
+                  mode: "cors",
+                  headers: { 'x-test': 'testing' }
+                }, {
+          "site": "cross-site",
+          "user": "",
+          "mode": "cors",
+          "dest": "empty"
+        }, "Cross-site fetch with preflight");
+}, "Cross-site fetch with preflight");
diff --git a/test/wpt/tests/fetch/metadata/fetch.https.sub.any.js b/test/wpt/tests/fetch/metadata/fetch.https.sub.any.js
new file mode 100644
index 00000000000..aeec5cdf2dc
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/fetch.https.sub.any.js
@@ -0,0 +1,58 @@
+// META: global=window,worker
+// META: script=/fetch/metadata/resources/helper.js
+
+// Site
+promise_test(t => {
+  return validate_expectations_custom_url("https://{{host}}:{{ports[https][0]}}/fetch/metadata/resources/echo-as-json.py", {}, {
+          "site": "same-origin",
+          "user": "",
+          "mode": "cors",
+          "dest": "empty"
+        }, "Same-origin fetch");
+}, "Same-origin fetch");
+
+promise_test(t => {
+  return validate_expectations_custom_url("https://{{hosts[][www]}}:{{ports[https][0]}}/fetch/metadata/resources/echo-as-json.py", {}, {
+          "site": "same-site",
+          "user": "",
+          "mode": "cors",
+          "dest": "empty"
+        }, "Same-site fetch");
+}, "Same-site fetch");
+
+promise_test(t => {
+  return validate_expectations_custom_url("https://{{hosts[alt][www]}}:{{ports[https][0]}}/fetch/metadata/resources/echo-as-json.py", {}, {
+          "site": "cross-site",
+          "user": "",
+          "mode": "cors",
+          "dest": "empty"
+        }, "Cross-site fetch");
+}, "Cross-site fetch");
+
+// Mode
+promise_test(t => {
+  return validate_expectations_custom_url("https://{{host}}:{{ports[https][0]}}/fetch/metadata/resources/echo-as-json.py", {mode: "same-origin"}, {
+          "site": "same-origin",
+          "user": "",
+          "mode": "same-origin",
+          "dest": "empty"
+        }, "Same-origin mode");
+}, "Same-origin mode");
+
+promise_test(t => {
+  return validate_expectations_custom_url("https://{{host}}:{{ports[https][0]}}/fetch/metadata/resources/echo-as-json.py", {mode: "cors"}, {
+          "site": "same-origin",
+          "user": "",
+          "mode": "cors",
+          "dest": "empty"
+        }, "CORS mode");
+}, "CORS mode");
+
+promise_test(t => {
+  return validate_expectations_custom_url("https://{{host}}:{{ports[https][0]}}/fetch/metadata/resources/echo-as-json.py", {mode: "no-cors"}, {
+          "site": "same-origin",
+          "user": "",
+          "mode": "no-cors",
+          "dest": "empty"
+        }, "no-CORS mode");
+}, "no-CORS mode");
diff --git a/test/wpt/tests/fetch/metadata/generated/appcache-manifest.https.sub.html b/test/wpt/tests/fetch/metadata/generated/appcache-manifest.https.sub.html
new file mode 100644
index 00000000000..cf322fd34bc
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/generated/appcache-manifest.https.sub.html
@@ -0,0 +1,341 @@
+<!DOCTYPE html>
+<!--
+This test was procedurally generated. Please do not modify it directly.
+Sources:
+- fetch/metadata/tools/fetch-metadata.conf.yml
+- fetch/metadata/tools/templates/appcache-manifest.sub.https.html
+-->
+<html lang="en">
+  <meta charset="utf-8">
+  <title>HTTP headers on request for Appcache manifest</title>
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  <script src="/fetch/metadata/resources/helper.sub.js"></script>
+  <body>
+  <script>
+  'use strict';
+
+  function induceRequest(url) {
+    const iframe = document.createElement('iframe');
+    iframe.src =
+      '/fetch/metadata/resources/appcache-iframe.sub.html?manifest=' + encodeURIComponent(url);
+
+    return new Promise((resolve) => {
+        addEventListener('message', function onMessage(event) {
+          if (event.source !== iframe.contentWindow) {
+            return;
+          }
+          removeEventListener('message', onMessage);
+          resolve(event.data);
+        });
+
+        document.body.appendChild(iframe);
+      })
+      .then((message) => {
+        if (message !== 'okay') {
+          throw message;
+        }
+      })
+      .then(() => iframe.remove());
+  }
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    assert_implements_optional(
+      !!window.applicationCache, 'Application Cache supported.'
+    );
+
+    induceRequest(makeRequestURL(key, ['httpsOrigin']))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-origin']);
+      })
+      .then(() => t.done(), t.step_func((error) => { throw error; }));
+  }, 'sec-fetch-site - Same origin');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    assert_implements_optional(
+      !!window.applicationCache, 'Application Cache supported.'
+    );
+
+    induceRequest(makeRequestURL(key, ['httpsCrossSite']))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+      })
+      .then(() => t.done(), t.step_func((error) => { throw error; }));
+  }, 'sec-fetch-site - Cross-site');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    assert_implements_optional(
+      !!window.applicationCache, 'Application Cache supported.'
+    );
+
+    induceRequest(makeRequestURL(key, ['httpsSameSite']))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+      })
+      .then(() => t.done(), t.step_func((error) => { throw error; }));
+  }, 'sec-fetch-site - Same site');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    assert_implements_optional(
+      !!window.applicationCache, 'Application Cache supported.'
+    );
+
+    induceRequest(makeRequestURL(key, ['httpsOrigin', 'httpOrigin']))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+      })
+      .then(() => t.done(), t.step_func((error) => { throw error; }));
+  }, 'sec-fetch-site - HTTPS downgrade (header not sent)');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    assert_implements_optional(
+      !!window.applicationCache, 'Application Cache supported.'
+    );
+
+    induceRequest(makeRequestURL(key, ['httpOrigin', 'httpsOrigin']))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+      })
+      .then(() => t.done(), t.step_func((error) => { throw error; }));
+  }, 'sec-fetch-site - HTTPS upgrade');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    assert_implements_optional(
+      !!window.applicationCache, 'Application Cache supported.'
+    );
+
+    induceRequest(makeRequestURL(key, ['httpsOrigin', 'httpOrigin', 'httpsOrigin']))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+      })
+      .then(() => t.done(), t.step_func((error) => { throw error; }));
+  }, 'sec-fetch-site - HTTPS downgrade-upgrade');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    assert_implements_optional(
+      !!window.applicationCache, 'Application Cache supported.'
+    );
+
+    induceRequest(makeRequestURL(key, ['httpsOrigin', 'httpsCrossSite', 'httpsOrigin']))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+      })
+      .then(() => t.done(), t.step_func((error) => { throw error; }));
+  }, 'sec-fetch-site - Same-Origin -> Cross-Site -> Same-Origin redirect');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    assert_implements_optional(
+      !!window.applicationCache, 'Application Cache supported.'
+    );
+
+    induceRequest(makeRequestURL(key, ['httpsOrigin', 'httpsSameSite', 'httpsOrigin']))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+      })
+      .then(() => t.done(), t.step_func((error) => { throw error; }));
+  }, 'sec-fetch-site - Same-Origin -> Same-Site -> Same-Origin redirect');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    assert_implements_optional(
+      !!window.applicationCache, 'Application Cache supported.'
+    );
+
+    induceRequest(makeRequestURL(key, ['httpsCrossSite', 'httpsOrigin']))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+      })
+      .then(() => t.done(), t.step_func((error) => { throw error; }));
+  }, 'sec-fetch-site - Cross-Site -> Same Origin');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    assert_implements_optional(
+      !!window.applicationCache, 'Application Cache supported.'
+    );
+
+    induceRequest(makeRequestURL(key, ['httpsCrossSite', 'httpsSameSite']))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+      })
+      .then(() => t.done(), t.step_func((error) => { throw error; }));
+  }, 'sec-fetch-site - Cross-Site -> Same-Site');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    assert_implements_optional(
+      !!window.applicationCache, 'Application Cache supported.'
+    );
+
+    induceRequest(makeRequestURL(key, ['httpsCrossSite', 'httpsCrossSite']))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+      })
+      .then(() => t.done(), t.step_func((error) => { throw error; }));
+  }, 'sec-fetch-site - Cross-Site -> Cross-Site');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    assert_implements_optional(
+      !!window.applicationCache, 'Application Cache supported.'
+    );
+
+    induceRequest(makeRequestURL(key, ['httpsOrigin', 'httpsOrigin']))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-origin']);
+      })
+      .then(() => t.done(), t.step_func((error) => { throw error; }));
+  }, 'sec-fetch-site - Same-Origin -> Same Origin');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    assert_implements_optional(
+      !!window.applicationCache, 'Application Cache supported.'
+    );
+
+    induceRequest(makeRequestURL(key, ['httpsOrigin', 'httpsSameSite']))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+      })
+      .then(() => t.done(), t.step_func((error) => { throw error; }));
+  }, 'sec-fetch-site - Same-Origin -> Same-Site');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    assert_implements_optional(
+      !!window.applicationCache, 'Application Cache supported.'
+    );
+
+    induceRequest(makeRequestURL(key, ['httpsOrigin', 'httpsCrossSite']))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+      })
+      .then(() => t.done(), t.step_func((error) => { throw error; }));
+  }, 'sec-fetch-site - Same-Origin -> Cross-Site');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    assert_implements_optional(
+      !!window.applicationCache, 'Application Cache supported.'
+    );
+
+    induceRequest(makeRequestURL(key, ['httpsSameSite', 'httpsOrigin']))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+      })
+      .then(() => t.done(), t.step_func((error) => { throw error; }));
+  }, 'sec-fetch-site - Same-Site -> Same Origin');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    assert_implements_optional(
+      !!window.applicationCache, 'Application Cache supported.'
+    );
+
+    induceRequest(makeRequestURL(key, ['httpsSameSite', 'httpsSameSite']))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+      })
+      .then(() => t.done(), t.step_func((error) => { throw error; }));
+  }, 'sec-fetch-site - Same-Site -> Same-Site');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    assert_implements_optional(
+      !!window.applicationCache, 'Application Cache supported.'
+    );
+
+    induceRequest(makeRequestURL(key, ['httpsSameSite', 'httpsCrossSite']))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+      })
+      .then(() => t.done(), t.step_func((error) => { throw error; }));
+  }, 'sec-fetch-site - Same-Site -> Cross-Site');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    assert_implements_optional(
+      !!window.applicationCache, 'Application Cache supported.'
+    );
+
+    induceRequest(makeRequestURL(key, []))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-mode');
+          assert_array_equals(headers['sec-fetch-mode'], ['no-cors']);
+      })
+      .then(() => t.done(), t.step_func((error) => { throw error; }));
+  }, 'sec-fetch-mode');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    assert_implements_optional(
+      !!window.applicationCache, 'Application Cache supported.'
+    );
+
+    induceRequest(makeRequestURL(key, []))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-dest');
+          assert_array_equals(headers['sec-fetch-dest'], ['empty']);
+      })
+      .then(() => t.done(), t.step_func((error) => { throw error; }));
+  }, 'sec-fetch-dest');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    assert_implements_optional(
+      !!window.applicationCache, 'Application Cache supported.'
+    );
+
+    induceRequest(makeRequestURL(key, []))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+      })
+      .then(() => t.done(), t.step_func((error) => { throw error; }));
+  }, 'sec-fetch-user');
+  </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/fetch/metadata/generated/audioworklet.https.sub.html b/test/wpt/tests/fetch/metadata/generated/audioworklet.https.sub.html
new file mode 100644
index 00000000000..64fb7607e26
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/generated/audioworklet.https.sub.html
@@ -0,0 +1,271 @@
+<!DOCTYPE html>
+<!--
+This test was procedurally generated. Please do not modify it directly.
+Sources:
+- fetch/metadata/tools/fetch-metadata.conf.yml
+- fetch/metadata/tools/templates/audioworklet.https.sub.html
+-->
+<html lang="en">
+  <meta charset="utf-8">
+  <title>HTTP headers on request for AudioWorklet module</title>
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  <script src="/resources/testdriver.js"></script>
+  <script src="/resources/testdriver-vendor.js"></script>
+  <script src="/fetch/metadata/resources/helper.sub.js"></script>
+  <body>
+  <script>
+  'use strict';
+
+  function induceRequest(url, test) {
+    return test_driver.bless(
+      'Enable WebAudio playback',
+      () => {
+        const audioContext = new AudioContext();
+
+        test.add_cleanup(() => audioContext.close());
+
+        return audioContext.audioWorklet.addModule(url);
+      }
+    );
+  }
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsOrigin'], {mime: 'text/javascript'}),
+        t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-origin']);
+        });
+  }, 'sec-fetch-site - Same origin');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsCrossSite'], {mime: 'text/javascript'}),
+        t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Cross-site');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsSameSite'], {mime: 'text/javascript'}),
+        t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - Same site');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsOrigin', 'httpsCrossSite', 'httpsOrigin'], {mime: 'text/javascript'}),
+        t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Same-Origin -> Cross-Site -> Same-Origin redirect');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsOrigin', 'httpsSameSite', 'httpsOrigin'], {mime: 'text/javascript'}),
+        t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - Same-Origin -> Same-Site -> Same-Origin redirect');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsCrossSite', 'httpsOrigin'], {mime: 'text/javascript'}),
+        t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Cross-Site -> Same Origin');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsCrossSite', 'httpsSameSite'], {mime: 'text/javascript'}),
+        t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Cross-Site -> Same-Site');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsCrossSite', 'httpsCrossSite'], {mime: 'text/javascript'}),
+        t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Cross-Site -> Cross-Site');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsOrigin', 'httpsOrigin'], {mime: 'text/javascript'}),
+        t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-origin']);
+        });
+  }, 'sec-fetch-site - Same-Origin -> Same Origin');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsOrigin', 'httpsSameSite'], {mime: 'text/javascript'}),
+        t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - Same-Origin -> Same-Site');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsOrigin', 'httpsCrossSite'], {mime: 'text/javascript'}),
+        t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Same-Origin -> Cross-Site');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsSameSite', 'httpsOrigin'], {mime: 'text/javascript'}),
+        t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - Same-Site -> Same Origin');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsSameSite', 'httpsSameSite'], {mime: 'text/javascript'}),
+        t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - Same-Site -> Same-Site');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsSameSite', 'httpsCrossSite'], {mime: 'text/javascript'}),
+        t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Same-Site -> Cross-Site');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, [], {mime: 'text/javascript'}),
+        t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-mode');
+          assert_array_equals(headers['sec-fetch-mode'], ['cors']);
+        });
+  }, 'sec-fetch-mode');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, [], {mime: 'text/javascript'}),
+        t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-dest');
+          assert_array_equals(headers['sec-fetch-dest'], ['audioworklet']);
+        });
+  }, 'sec-fetch-dest');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, [], {mime: 'text/javascript'}),
+        t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user');
+  </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/fetch/metadata/generated/css-font-face.https.sub.tentative.html b/test/wpt/tests/fetch/metadata/generated/css-font-face.https.sub.tentative.html
new file mode 100644
index 00000000000..332effeb1f8
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/generated/css-font-face.https.sub.tentative.html
@@ -0,0 +1,230 @@
+<!DOCTYPE html>
+<!--
+This test was procedurally generated. Please do not modify it directly.
+Sources:
+- fetch/metadata/tools/fetch-metadata.conf.yml
+- fetch/metadata/tools/templates/css-font-face.sub.html
+-->
+<html lang="en">
+  <meta charset="utf-8">
+  <title>HTTP headers on request for CSS font-face</title>
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  <script src="/fetch/metadata/resources/helper.sub.js"></script>
+  <body>
+  <script>
+  'use strict';
+
+  let count = 0;
+
+  function induceRequest(t, url) {
+    const id = `el-${count += 1}`;
+    const style = document.createElement('style');
+    style.appendChild(document.createTextNode(`
+      @font-face {
+        font-family: wpt-font-family${id};
+        src: url(${url});
+      }
+      #el-${id} {
+        font-family: wpt-font-family${id};
+      }
+    `));
+    const div = document.createElement('div');
+    div.setAttribute('id', 'el-' + id);
+    div.appendChild(style);
+    div.appendChild(document.createTextNode('x'));
+    document.body.appendChild(div);
+
+    t.add_cleanup(() => div.remove());
+
+    return document.fonts.ready;
+  }
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(t, makeRequestURL(key, ['httpsOrigin']))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-origin']);
+      });
+  }, 'sec-fetch-site - Same origin');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(t, makeRequestURL(key, ['httpsCrossSite']))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+      });
+  }, 'sec-fetch-site - Cross-site');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(t, makeRequestURL(key, ['httpsSameSite']))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+      });
+  }, 'sec-fetch-site - Same site');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(t, makeRequestURL(key, ['httpsOrigin', 'httpsCrossSite', 'httpsOrigin']))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+      });
+  }, 'sec-fetch-site - Same-Origin -> Cross-Site -> Same-Origin redirect');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(t, makeRequestURL(key, ['httpsOrigin', 'httpsSameSite', 'httpsOrigin']))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+      });
+  }, 'sec-fetch-site - Same-Origin -> Same-Site -> Same-Origin redirect');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(t, makeRequestURL(key, ['httpsCrossSite', 'httpsOrigin']))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+      });
+  }, 'sec-fetch-site - Cross-Site -> Same Origin');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(t, makeRequestURL(key, ['httpsCrossSite', 'httpsSameSite']))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+      });
+  }, 'sec-fetch-site - Cross-Site -> Same-Site');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(t, makeRequestURL(key, ['httpsCrossSite', 'httpsCrossSite']))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+      });
+  }, 'sec-fetch-site - Cross-Site -> Cross-Site');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(t, makeRequestURL(key, ['httpsOrigin', 'httpsOrigin']))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-origin']);
+      });
+  }, 'sec-fetch-site - Same-Origin -> Same Origin');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(t, makeRequestURL(key, ['httpsOrigin', 'httpsSameSite']))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+      });
+  }, 'sec-fetch-site - Same-Origin -> Same-Site');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(t, makeRequestURL(key, ['httpsOrigin', 'httpsCrossSite']))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+      });
+  }, 'sec-fetch-site - Same-Origin -> Cross-Site');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(t, makeRequestURL(key, ['httpsSameSite', 'httpsOrigin']))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+      });
+  }, 'sec-fetch-site - Same-Site -> Same Origin');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(t, makeRequestURL(key, ['httpsSameSite', 'httpsSameSite']))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+      });
+  }, 'sec-fetch-site - Same-Site -> Same-Site');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(t, makeRequestURL(key, ['httpsSameSite', 'httpsCrossSite']))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+      });
+  }, 'sec-fetch-site - Same-Site -> Cross-Site');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(t, makeRequestURL(key, []))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-mode');
+          assert_array_equals(headers['sec-fetch-mode'], ['cors']);
+      });
+  }, 'sec-fetch-mode');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(t, makeRequestURL(key, []))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-dest');
+          assert_array_equals(headers['sec-fetch-dest'], ['font']);
+      });
+  }, 'sec-fetch-dest');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(t, makeRequestURL(key, []))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+      });
+  }, 'sec-fetch-user');
+  </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/fetch/metadata/generated/css-font-face.sub.tentative.html b/test/wpt/tests/fetch/metadata/generated/css-font-face.sub.tentative.html
new file mode 100644
index 00000000000..8a0b90cee10
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/generated/css-font-face.sub.tentative.html
@@ -0,0 +1,196 @@
+<!DOCTYPE html>
+<!--
+This test was procedurally generated. Please do not modify it directly.
+Sources:
+- fetch/metadata/tools/fetch-metadata.conf.yml
+- fetch/metadata/tools/templates/css-font-face.sub.html
+-->
+<html lang="en">
+  <meta charset="utf-8">
+  <title>HTTP headers on request for CSS font-face</title>
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  <script src="/fetch/metadata/resources/helper.sub.js"></script>
+  <body>
+  <script>
+  'use strict';
+
+  let count = 0;
+
+  function induceRequest(t, url) {
+    const id = `el-${count += 1}`;
+    const style = document.createElement('style');
+    style.appendChild(document.createTextNode(`
+      @font-face {
+        font-family: wpt-font-family${id};
+        src: url(${url});
+      }
+      #el-${id} {
+        font-family: wpt-font-family${id};
+      }
+    `));
+    const div = document.createElement('div');
+    div.setAttribute('id', 'el-' + id);
+    div.appendChild(style);
+    div.appendChild(document.createTextNode('x'));
+    document.body.appendChild(div);
+
+    t.add_cleanup(() => div.remove());
+
+    return document.fonts.ready;
+  }
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(t, makeRequestURL(key, ['httpOrigin']))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+      });
+  }, 'sec-fetch-site - Not sent to non-trustworthy same-origin destination');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(t, makeRequestURL(key, ['httpSameSite']))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+      });
+  }, 'sec-fetch-site - Not sent to non-trustworthy same-site destination');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(t, makeRequestURL(key, ['httpCrossSite']))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+      });
+  }, 'sec-fetch-site - Not sent to non-trustworthy cross-site destination');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(t, makeRequestURL(key, ['httpOrigin']))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-mode');
+      });
+  }, 'sec-fetch-mode - Not sent to non-trustworthy same-origin destination');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(t, makeRequestURL(key, ['httpSameSite']))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-mode');
+      });
+  }, 'sec-fetch-mode - Not sent to non-trustworthy same-site destination');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(t, makeRequestURL(key, ['httpCrossSite']))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-mode');
+      });
+  }, 'sec-fetch-mode - Not sent to non-trustworthy cross-site destination');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(t, makeRequestURL(key, ['httpOrigin']))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-dest');
+      });
+  }, 'sec-fetch-dest - Not sent to non-trustworthy same-origin destination');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(t, makeRequestURL(key, ['httpSameSite']))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-dest');
+      });
+  }, 'sec-fetch-dest - Not sent to non-trustworthy same-site destination');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(t, makeRequestURL(key, ['httpCrossSite']))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-dest');
+      });
+  }, 'sec-fetch-dest - Not sent to non-trustworthy cross-site destination');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(t, makeRequestURL(key, ['httpOrigin']))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+      });
+  }, 'sec-fetch-user - Not sent to non-trustworthy same-origin destination');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(t, makeRequestURL(key, ['httpSameSite']))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+      });
+  }, 'sec-fetch-user - Not sent to non-trustworthy same-site destination');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(t, makeRequestURL(key, ['httpCrossSite']))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+      });
+  }, 'sec-fetch-user - Not sent to non-trustworthy cross-site destination');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(t, makeRequestURL(key, ['httpsOrigin', 'httpOrigin']))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+      });
+  }, 'sec-fetch-site - HTTPS downgrade (header not sent)');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(t, makeRequestURL(key, ['httpOrigin', 'httpsOrigin']))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+      });
+  }, 'sec-fetch-site - HTTPS upgrade');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(t, makeRequestURL(key, ['httpsOrigin', 'httpOrigin', 'httpsOrigin']))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+      });
+  }, 'sec-fetch-site - HTTPS downgrade-upgrade');
+  </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/fetch/metadata/generated/css-images.https.sub.tentative.html b/test/wpt/tests/fetch/metadata/generated/css-images.https.sub.tentative.html
new file mode 100644
index 00000000000..3fa24019289
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/generated/css-images.https.sub.tentative.html
@@ -0,0 +1,1384 @@
+<!DOCTYPE html>
+<!--
+This test was procedurally generated. Please do not modify it directly.
+Sources:
+- fetch/metadata/tools/fetch-metadata.conf.yml
+- fetch/metadata/tools/templates/css-images.sub.html
+-->
+<html lang="en">
+  <meta charset="utf-8">
+  <meta name="timeout" content="long">
+  <title>HTTP headers on request for CSS image-accepting properties</title>
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  <script src="/fetch/metadata/resources/helper.sub.js"></script>
+  <body>
+  <script>
+  'use strict';
+
+  /**
+   * The subtests in this file use an iframe to induce requests for CSS
+   * resources because an iframe's `onload` event is the most direct and
+   * generic mechanism to detect loading of CSS resources. As an optimization,
+   * the subtests share the same iframe and document.
+   */
+  const declarations = [];
+  const iframe = document.createElement('iframe');
+  const whenIframeReady = new Promise((resolve, reject) => {
+    iframe.onload = resolve;
+    iframe.onerror = reject;
+  });
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsOrigin']);
+
+    declarations.push(`background-image: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_equals(headers['sec-fetch-site'], 'same-origin');
+        })
+        .then(t.step_func_done(), (error) => t.unreached_func());
+  }, 'background-image sec-fetch-site - Same origin');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsOrigin']);
+
+    declarations.push(`border-image: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-origin']);
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'border-image sec-fetch-site - Same origin');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsOrigin']);
+
+    declarations.push(`content: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-origin']);
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'content sec-fetch-site - Same origin');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsOrigin']);
+
+    declarations.push(`cursor: url("${url}"), auto;`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-origin']);
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'cursor sec-fetch-site - Same origin');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsOrigin']);
+
+    declarations.push(`list-style-image: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-origin']);
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'list-style-image sec-fetch-site - Same origin');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsCrossSite']);
+
+    declarations.push(`background-image: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_equals(headers['sec-fetch-site'], 'cross-site');
+        })
+        .then(t.step_func_done(), (error) => t.unreached_func());
+  }, 'background-image sec-fetch-site - Cross-site');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsCrossSite']);
+
+    declarations.push(`border-image: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'border-image sec-fetch-site - Cross-site');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsCrossSite']);
+
+    declarations.push(`content: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'content sec-fetch-site - Cross-site');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsCrossSite']);
+
+    declarations.push(`cursor: url("${url}"), auto;`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'cursor sec-fetch-site - Cross-site');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsCrossSite']);
+
+    declarations.push(`list-style-image: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'list-style-image sec-fetch-site - Cross-site');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsSameSite']);
+
+    declarations.push(`background-image: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_equals(headers['sec-fetch-site'], 'same-site');
+        })
+        .then(t.step_func_done(), (error) => t.unreached_func());
+  }, 'background-image sec-fetch-site - Same site');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsSameSite']);
+
+    declarations.push(`border-image: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'border-image sec-fetch-site - Same site');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsSameSite']);
+
+    declarations.push(`content: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'content sec-fetch-site - Same site');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsSameSite']);
+
+    declarations.push(`cursor: url("${url}"), auto;`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'cursor sec-fetch-site - Same site');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsSameSite']);
+
+    declarations.push(`list-style-image: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'list-style-image sec-fetch-site - Same site');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsOrigin', 'httpsCrossSite', 'httpsOrigin']);
+
+    declarations.push(`background-image: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_equals(headers['sec-fetch-site'], 'cross-site');
+        })
+        .then(t.step_func_done(), (error) => t.unreached_func());
+  }, 'background-image sec-fetch-site - Same-Origin -> Cross-Site -> Same-Origin redirect');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsOrigin', 'httpsCrossSite', 'httpsOrigin']);
+
+    declarations.push(`border-image: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'border-image sec-fetch-site - Same-Origin -> Cross-Site -> Same-Origin redirect');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsOrigin', 'httpsCrossSite', 'httpsOrigin']);
+
+    declarations.push(`content: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'content sec-fetch-site - Same-Origin -> Cross-Site -> Same-Origin redirect');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsOrigin', 'httpsCrossSite', 'httpsOrigin']);
+
+    declarations.push(`cursor: url("${url}"), auto;`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'cursor sec-fetch-site - Same-Origin -> Cross-Site -> Same-Origin redirect');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsOrigin', 'httpsCrossSite', 'httpsOrigin']);
+
+    declarations.push(`list-style-image: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'list-style-image sec-fetch-site - Same-Origin -> Cross-Site -> Same-Origin redirect');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsOrigin', 'httpsSameSite', 'httpsOrigin']);
+
+    declarations.push(`background-image: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_equals(headers['sec-fetch-site'], 'same-site');
+        })
+        .then(t.step_func_done(), (error) => t.unreached_func());
+  }, 'background-image sec-fetch-site - Same-Origin -> Same-Site -> Same-Origin redirect');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsOrigin', 'httpsSameSite', 'httpsOrigin']);
+
+    declarations.push(`border-image: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'border-image sec-fetch-site - Same-Origin -> Same-Site -> Same-Origin redirect');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsOrigin', 'httpsSameSite', 'httpsOrigin']);
+
+    declarations.push(`content: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'content sec-fetch-site - Same-Origin -> Same-Site -> Same-Origin redirect');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsOrigin', 'httpsSameSite', 'httpsOrigin']);
+
+    declarations.push(`cursor: url("${url}"), auto;`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'cursor sec-fetch-site - Same-Origin -> Same-Site -> Same-Origin redirect');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsOrigin', 'httpsSameSite', 'httpsOrigin']);
+
+    declarations.push(`list-style-image: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'list-style-image sec-fetch-site - Same-Origin -> Same-Site -> Same-Origin redirect');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsCrossSite', 'httpsOrigin']);
+
+    declarations.push(`background-image: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_equals(headers['sec-fetch-site'], 'cross-site');
+        })
+        .then(t.step_func_done(), (error) => t.unreached_func());
+  }, 'background-image sec-fetch-site - Cross-Site -> Same Origin');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsCrossSite', 'httpsOrigin']);
+
+    declarations.push(`border-image: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'border-image sec-fetch-site - Cross-Site -> Same Origin');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsCrossSite', 'httpsOrigin']);
+
+    declarations.push(`content: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'content sec-fetch-site - Cross-Site -> Same Origin');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsCrossSite', 'httpsOrigin']);
+
+    declarations.push(`cursor: url("${url}"), auto;`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'cursor sec-fetch-site - Cross-Site -> Same Origin');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsCrossSite', 'httpsOrigin']);
+
+    declarations.push(`list-style-image: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'list-style-image sec-fetch-site - Cross-Site -> Same Origin');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsCrossSite', 'httpsSameSite']);
+
+    declarations.push(`background-image: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_equals(headers['sec-fetch-site'], 'cross-site');
+        })
+        .then(t.step_func_done(), (error) => t.unreached_func());
+  }, 'background-image sec-fetch-site - Cross-Site -> Same-Site');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsCrossSite', 'httpsSameSite']);
+
+    declarations.push(`border-image: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'border-image sec-fetch-site - Cross-Site -> Same-Site');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsCrossSite', 'httpsSameSite']);
+
+    declarations.push(`content: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'content sec-fetch-site - Cross-Site -> Same-Site');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsCrossSite', 'httpsSameSite']);
+
+    declarations.push(`cursor: url("${url}"), auto;`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'cursor sec-fetch-site - Cross-Site -> Same-Site');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsCrossSite', 'httpsSameSite']);
+
+    declarations.push(`list-style-image: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'list-style-image sec-fetch-site - Cross-Site -> Same-Site');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsCrossSite', 'httpsCrossSite']);
+
+    declarations.push(`background-image: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_equals(headers['sec-fetch-site'], 'cross-site');
+        })
+        .then(t.step_func_done(), (error) => t.unreached_func());
+  }, 'background-image sec-fetch-site - Cross-Site -> Cross-Site');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsCrossSite', 'httpsCrossSite']);
+
+    declarations.push(`border-image: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'border-image sec-fetch-site - Cross-Site -> Cross-Site');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsCrossSite', 'httpsCrossSite']);
+
+    declarations.push(`content: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'content sec-fetch-site - Cross-Site -> Cross-Site');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsCrossSite', 'httpsCrossSite']);
+
+    declarations.push(`cursor: url("${url}"), auto;`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'cursor sec-fetch-site - Cross-Site -> Cross-Site');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsCrossSite', 'httpsCrossSite']);
+
+    declarations.push(`list-style-image: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'list-style-image sec-fetch-site - Cross-Site -> Cross-Site');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsOrigin', 'httpsOrigin']);
+
+    declarations.push(`background-image: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_equals(headers['sec-fetch-site'], 'same-origin');
+        })
+        .then(t.step_func_done(), (error) => t.unreached_func());
+  }, 'background-image sec-fetch-site - Same-Origin -> Same Origin');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsOrigin', 'httpsOrigin']);
+
+    declarations.push(`border-image: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-origin']);
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'border-image sec-fetch-site - Same-Origin -> Same Origin');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsOrigin', 'httpsOrigin']);
+
+    declarations.push(`content: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-origin']);
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'content sec-fetch-site - Same-Origin -> Same Origin');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsOrigin', 'httpsOrigin']);
+
+    declarations.push(`cursor: url("${url}"), auto;`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-origin']);
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'cursor sec-fetch-site - Same-Origin -> Same Origin');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsOrigin', 'httpsOrigin']);
+
+    declarations.push(`list-style-image: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-origin']);
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'list-style-image sec-fetch-site - Same-Origin -> Same Origin');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsOrigin', 'httpsSameSite']);
+
+    declarations.push(`background-image: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_equals(headers['sec-fetch-site'], 'same-site');
+        })
+        .then(t.step_func_done(), (error) => t.unreached_func());
+  }, 'background-image sec-fetch-site - Same-Origin -> Same-Site');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsOrigin', 'httpsSameSite']);
+
+    declarations.push(`border-image: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'border-image sec-fetch-site - Same-Origin -> Same-Site');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsOrigin', 'httpsSameSite']);
+
+    declarations.push(`content: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'content sec-fetch-site - Same-Origin -> Same-Site');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsOrigin', 'httpsSameSite']);
+
+    declarations.push(`cursor: url("${url}"), auto;`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'cursor sec-fetch-site - Same-Origin -> Same-Site');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsOrigin', 'httpsSameSite']);
+
+    declarations.push(`list-style-image: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'list-style-image sec-fetch-site - Same-Origin -> Same-Site');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsOrigin', 'httpsCrossSite']);
+
+    declarations.push(`background-image: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_equals(headers['sec-fetch-site'], 'cross-site');
+        })
+        .then(t.step_func_done(), (error) => t.unreached_func());
+  }, 'background-image sec-fetch-site - Same-Origin -> Cross-Site');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsOrigin', 'httpsCrossSite']);
+
+    declarations.push(`border-image: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'border-image sec-fetch-site - Same-Origin -> Cross-Site');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsOrigin', 'httpsCrossSite']);
+
+    declarations.push(`content: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'content sec-fetch-site - Same-Origin -> Cross-Site');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsOrigin', 'httpsCrossSite']);
+
+    declarations.push(`cursor: url("${url}"), auto;`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'cursor sec-fetch-site - Same-Origin -> Cross-Site');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsOrigin', 'httpsCrossSite']);
+
+    declarations.push(`list-style-image: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'list-style-image sec-fetch-site - Same-Origin -> Cross-Site');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsSameSite', 'httpsOrigin']);
+
+    declarations.push(`background-image: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_equals(headers['sec-fetch-site'], 'same-site');
+        })
+        .then(t.step_func_done(), (error) => t.unreached_func());
+  }, 'background-image sec-fetch-site - Same-Site -> Same Origin');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsSameSite', 'httpsOrigin']);
+
+    declarations.push(`border-image: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'border-image sec-fetch-site - Same-Site -> Same Origin');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsSameSite', 'httpsOrigin']);
+
+    declarations.push(`content: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'content sec-fetch-site - Same-Site -> Same Origin');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsSameSite', 'httpsOrigin']);
+
+    declarations.push(`cursor: url("${url}"), auto;`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'cursor sec-fetch-site - Same-Site -> Same Origin');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsSameSite', 'httpsOrigin']);
+
+    declarations.push(`list-style-image: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'list-style-image sec-fetch-site - Same-Site -> Same Origin');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsSameSite', 'httpsSameSite']);
+
+    declarations.push(`background-image: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_equals(headers['sec-fetch-site'], 'same-site');
+        })
+        .then(t.step_func_done(), (error) => t.unreached_func());
+  }, 'background-image sec-fetch-site - Same-Site -> Same-Site');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsSameSite', 'httpsSameSite']);
+
+    declarations.push(`border-image: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'border-image sec-fetch-site - Same-Site -> Same-Site');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsSameSite', 'httpsSameSite']);
+
+    declarations.push(`content: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'content sec-fetch-site - Same-Site -> Same-Site');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsSameSite', 'httpsSameSite']);
+
+    declarations.push(`cursor: url("${url}"), auto;`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'cursor sec-fetch-site - Same-Site -> Same-Site');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsSameSite', 'httpsSameSite']);
+
+    declarations.push(`list-style-image: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'list-style-image sec-fetch-site - Same-Site -> Same-Site');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsSameSite', 'httpsCrossSite']);
+
+    declarations.push(`background-image: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_equals(headers['sec-fetch-site'], 'cross-site');
+        })
+        .then(t.step_func_done(), (error) => t.unreached_func());
+  }, 'background-image sec-fetch-site - Same-Site -> Cross-Site');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsSameSite', 'httpsCrossSite']);
+
+    declarations.push(`border-image: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'border-image sec-fetch-site - Same-Site -> Cross-Site');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsSameSite', 'httpsCrossSite']);
+
+    declarations.push(`content: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'content sec-fetch-site - Same-Site -> Cross-Site');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsSameSite', 'httpsCrossSite']);
+
+    declarations.push(`cursor: url("${url}"), auto;`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'cursor sec-fetch-site - Same-Site -> Cross-Site');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsSameSite', 'httpsCrossSite']);
+
+    declarations.push(`list-style-image: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'list-style-image sec-fetch-site - Same-Site -> Cross-Site');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsOrigin', 'httpOrigin', 'httpsOrigin']);
+
+    declarations.push(`background-image: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_equals(headers['sec-fetch-site'], 'cross-site');
+        })
+        .then(t.step_func_done(), (error) => t.unreached_func());
+  }, 'background-image sec-fetch-site - HTTPS downgrade-upgrade');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsOrigin', 'httpOrigin', 'httpsOrigin']);
+
+    declarations.push(`border-image: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'border-image sec-fetch-site - HTTPS downgrade-upgrade');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsOrigin', 'httpOrigin', 'httpsOrigin']);
+
+    declarations.push(`content: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'content sec-fetch-site - HTTPS downgrade-upgrade');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsOrigin', 'httpOrigin', 'httpsOrigin']);
+
+    declarations.push(`cursor: url("${url}"), auto;`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'cursor sec-fetch-site - HTTPS downgrade-upgrade');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsOrigin', 'httpOrigin', 'httpsOrigin']);
+
+    declarations.push(`list-style-image: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'list-style-image sec-fetch-site - HTTPS downgrade-upgrade');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, []);
+
+    declarations.push(`background-image: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-mode');
+          assert_equals(headers['sec-fetch-mode'], 'no-cors');
+        })
+        .then(t.step_func_done(), (error) => t.unreached_func());
+  }, 'background-image sec-fetch-mode');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, []);
+
+    declarations.push(`border-image: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-mode');
+          assert_array_equals(headers['sec-fetch-mode'], ['no-cors']);
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'border-image sec-fetch-mode');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, []);
+
+    declarations.push(`content: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-mode');
+          assert_array_equals(headers['sec-fetch-mode'], ['no-cors']);
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'content sec-fetch-mode');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, []);
+
+    declarations.push(`cursor: url("${url}"), auto;`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-mode');
+          assert_array_equals(headers['sec-fetch-mode'], ['no-cors']);
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'cursor sec-fetch-mode');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, []);
+
+    declarations.push(`list-style-image: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-mode');
+          assert_array_equals(headers['sec-fetch-mode'], ['no-cors']);
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'list-style-image sec-fetch-mode');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, []);
+
+    declarations.push(`background-image: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-dest');
+          assert_equals(headers['sec-fetch-dest'], 'image');
+        })
+        .then(t.step_func_done(), (error) => t.unreached_func());
+  }, 'background-image sec-fetch-dest');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, []);
+
+    declarations.push(`border-image: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-dest');
+          assert_array_equals(headers['sec-fetch-dest'], ['image']);
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'border-image sec-fetch-dest');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, []);
+
+    declarations.push(`content: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-dest');
+          assert_array_equals(headers['sec-fetch-dest'], ['image']);
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'content sec-fetch-dest');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, []);
+
+    declarations.push(`cursor: url("${url}"), auto;`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-dest');
+          assert_array_equals(headers['sec-fetch-dest'], ['image']);
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'cursor sec-fetch-dest');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, []);
+
+    declarations.push(`list-style-image: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-dest');
+          assert_array_equals(headers['sec-fetch-dest'], ['image']);
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'list-style-image sec-fetch-dest');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, []);
+
+    declarations.push(`background-image: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        })
+        .then(t.step_func_done(), (error) => t.unreached_func());
+  }, 'background-image sec-fetch-user');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, []);
+
+    declarations.push(`border-image: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'border-image sec-fetch-user');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, []);
+
+    declarations.push(`content: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'content sec-fetch-user');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, []);
+
+    declarations.push(`cursor: url("${url}"), auto;`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'cursor sec-fetch-user');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, []);
+
+    declarations.push(`list-style-image: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'list-style-image sec-fetch-user');
+
+  iframe.srcdoc = declarations.map((declaration, index) => `
+    <style>.el${index} { ${declaration} }</style><div class="el${index}"></div>`
+    ).join('');
+  document.body.appendChild(iframe);
+
+  </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/fetch/metadata/generated/css-images.sub.tentative.html b/test/wpt/tests/fetch/metadata/generated/css-images.sub.tentative.html
new file mode 100644
index 00000000000..f1ef27cf087
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/generated/css-images.sub.tentative.html
@@ -0,0 +1,1099 @@
+<!DOCTYPE html>
+<!--
+This test was procedurally generated. Please do not modify it directly.
+Sources:
+- fetch/metadata/tools/fetch-metadata.conf.yml
+- fetch/metadata/tools/templates/css-images.sub.html
+-->
+<html lang="en">
+  <meta charset="utf-8">
+  <meta name="timeout" content="long">
+  <title>HTTP headers on request for CSS image-accepting properties</title>
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  <script src="/fetch/metadata/resources/helper.sub.js"></script>
+  <body>
+  <script>
+  'use strict';
+
+  /**
+   * The subtests in this file use an iframe to induce requests for CSS
+   * resources because an iframe's `onload` event is the most direct and
+   * generic mechanism to detect loading of CSS resources. As an optimization,
+   * the subtests share the same iframe and document.
+   */
+  const declarations = [];
+  const iframe = document.createElement('iframe');
+  const whenIframeReady = new Promise((resolve, reject) => {
+    iframe.onload = resolve;
+    iframe.onerror = reject;
+  });
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpOrigin']);
+
+    declarations.push(`background-image: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        })
+        .then(t.step_func_done(), (error) => t.unreached_func());
+  }, 'background-image sec-fetch-site - Not sent to non-trustworthy same-origin destination');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpOrigin']);
+
+    declarations.push(`border-image: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'border-image sec-fetch-site - Not sent to non-trustworthy same-origin destination');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpOrigin']);
+
+    declarations.push(`content: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'content sec-fetch-site - Not sent to non-trustworthy same-origin destination');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpOrigin']);
+
+    declarations.push(`cursor: url("${url}"), auto;`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'cursor sec-fetch-site - Not sent to non-trustworthy same-origin destination');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpOrigin']);
+
+    declarations.push(`list-style-image: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'list-style-image sec-fetch-site - Not sent to non-trustworthy same-origin destination');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpSameSite']);
+
+    declarations.push(`background-image: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        })
+        .then(t.step_func_done(), (error) => t.unreached_func());
+  }, 'background-image sec-fetch-site - Not sent to non-trustworthy same-site destination');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpSameSite']);
+
+    declarations.push(`border-image: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'border-image sec-fetch-site - Not sent to non-trustworthy same-site destination');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpSameSite']);
+
+    declarations.push(`content: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'content sec-fetch-site - Not sent to non-trustworthy same-site destination');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpSameSite']);
+
+    declarations.push(`cursor: url("${url}"), auto;`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'cursor sec-fetch-site - Not sent to non-trustworthy same-site destination');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpSameSite']);
+
+    declarations.push(`list-style-image: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'list-style-image sec-fetch-site - Not sent to non-trustworthy same-site destination');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpCrossSite']);
+
+    declarations.push(`background-image: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        })
+        .then(t.step_func_done(), (error) => t.unreached_func());
+  }, 'background-image sec-fetch-site - Not sent to non-trustworthy cross-site destination');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpCrossSite']);
+
+    declarations.push(`border-image: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'border-image sec-fetch-site - Not sent to non-trustworthy cross-site destination');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpCrossSite']);
+
+    declarations.push(`content: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'content sec-fetch-site - Not sent to non-trustworthy cross-site destination');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpCrossSite']);
+
+    declarations.push(`cursor: url("${url}"), auto;`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'cursor sec-fetch-site - Not sent to non-trustworthy cross-site destination');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpCrossSite']);
+
+    declarations.push(`list-style-image: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'list-style-image sec-fetch-site - Not sent to non-trustworthy cross-site destination');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpOrigin']);
+
+    declarations.push(`background-image: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-mode');
+        })
+        .then(t.step_func_done(), (error) => t.unreached_func());
+  }, 'background-image sec-fetch-mode - Not sent to non-trustworthy same-origin destination');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpOrigin']);
+
+    declarations.push(`border-image: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-mode');
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'border-image sec-fetch-mode - Not sent to non-trustworthy same-origin destination');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpOrigin']);
+
+    declarations.push(`content: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-mode');
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'content sec-fetch-mode - Not sent to non-trustworthy same-origin destination');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpOrigin']);
+
+    declarations.push(`cursor: url("${url}"), auto;`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-mode');
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'cursor sec-fetch-mode - Not sent to non-trustworthy same-origin destination');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpOrigin']);
+
+    declarations.push(`list-style-image: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-mode');
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'list-style-image sec-fetch-mode - Not sent to non-trustworthy same-origin destination');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpSameSite']);
+
+    declarations.push(`background-image: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-mode');
+        })
+        .then(t.step_func_done(), (error) => t.unreached_func());
+  }, 'background-image sec-fetch-mode - Not sent to non-trustworthy same-site destination');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpSameSite']);
+
+    declarations.push(`border-image: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-mode');
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'border-image sec-fetch-mode - Not sent to non-trustworthy same-site destination');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpSameSite']);
+
+    declarations.push(`content: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-mode');
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'content sec-fetch-mode - Not sent to non-trustworthy same-site destination');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpSameSite']);
+
+    declarations.push(`cursor: url("${url}"), auto;`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-mode');
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'cursor sec-fetch-mode - Not sent to non-trustworthy same-site destination');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpSameSite']);
+
+    declarations.push(`list-style-image: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-mode');
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'list-style-image sec-fetch-mode - Not sent to non-trustworthy same-site destination');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpCrossSite']);
+
+    declarations.push(`background-image: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-mode');
+        })
+        .then(t.step_func_done(), (error) => t.unreached_func());
+  }, 'background-image sec-fetch-mode - Not sent to non-trustworthy cross-site destination');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpCrossSite']);
+
+    declarations.push(`border-image: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-mode');
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'border-image sec-fetch-mode - Not sent to non-trustworthy cross-site destination');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpCrossSite']);
+
+    declarations.push(`content: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-mode');
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'content sec-fetch-mode - Not sent to non-trustworthy cross-site destination');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpCrossSite']);
+
+    declarations.push(`cursor: url("${url}"), auto;`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-mode');
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'cursor sec-fetch-mode - Not sent to non-trustworthy cross-site destination');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpCrossSite']);
+
+    declarations.push(`list-style-image: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-mode');
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'list-style-image sec-fetch-mode - Not sent to non-trustworthy cross-site destination');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpOrigin']);
+
+    declarations.push(`background-image: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-dest');
+        })
+        .then(t.step_func_done(), (error) => t.unreached_func());
+  }, 'background-image sec-fetch-dest - Not sent to non-trustworthy same-origin destination');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpOrigin']);
+
+    declarations.push(`border-image: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-dest');
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'border-image sec-fetch-dest - Not sent to non-trustworthy same-origin destination');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpOrigin']);
+
+    declarations.push(`content: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-dest');
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'content sec-fetch-dest - Not sent to non-trustworthy same-origin destination');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpOrigin']);
+
+    declarations.push(`cursor: url("${url}"), auto;`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-dest');
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'cursor sec-fetch-dest - Not sent to non-trustworthy same-origin destination');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpOrigin']);
+
+    declarations.push(`list-style-image: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-dest');
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'list-style-image sec-fetch-dest - Not sent to non-trustworthy same-origin destination');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpSameSite']);
+
+    declarations.push(`background-image: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-dest');
+        })
+        .then(t.step_func_done(), (error) => t.unreached_func());
+  }, 'background-image sec-fetch-dest - Not sent to non-trustworthy same-site destination');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpSameSite']);
+
+    declarations.push(`border-image: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-dest');
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'border-image sec-fetch-dest - Not sent to non-trustworthy same-site destination');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpSameSite']);
+
+    declarations.push(`content: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-dest');
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'content sec-fetch-dest - Not sent to non-trustworthy same-site destination');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpSameSite']);
+
+    declarations.push(`cursor: url("${url}"), auto;`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-dest');
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'cursor sec-fetch-dest - Not sent to non-trustworthy same-site destination');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpSameSite']);
+
+    declarations.push(`list-style-image: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-dest');
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'list-style-image sec-fetch-dest - Not sent to non-trustworthy same-site destination');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpCrossSite']);
+
+    declarations.push(`background-image: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-dest');
+        })
+        .then(t.step_func_done(), (error) => t.unreached_func());
+  }, 'background-image sec-fetch-dest - Not sent to non-trustworthy cross-site destination');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpCrossSite']);
+
+    declarations.push(`border-image: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-dest');
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'border-image sec-fetch-dest - Not sent to non-trustworthy cross-site destination');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpCrossSite']);
+
+    declarations.push(`content: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-dest');
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'content sec-fetch-dest - Not sent to non-trustworthy cross-site destination');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpCrossSite']);
+
+    declarations.push(`cursor: url("${url}"), auto;`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-dest');
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'cursor sec-fetch-dest - Not sent to non-trustworthy cross-site destination');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpCrossSite']);
+
+    declarations.push(`list-style-image: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-dest');
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'list-style-image sec-fetch-dest - Not sent to non-trustworthy cross-site destination');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpOrigin']);
+
+    declarations.push(`background-image: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        })
+        .then(t.step_func_done(), (error) => t.unreached_func());
+  }, 'background-image sec-fetch-user - Not sent to non-trustworthy same-origin destination');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpOrigin']);
+
+    declarations.push(`border-image: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'border-image sec-fetch-user - Not sent to non-trustworthy same-origin destination');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpOrigin']);
+
+    declarations.push(`content: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'content sec-fetch-user - Not sent to non-trustworthy same-origin destination');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpOrigin']);
+
+    declarations.push(`cursor: url("${url}"), auto;`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'cursor sec-fetch-user - Not sent to non-trustworthy same-origin destination');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpOrigin']);
+
+    declarations.push(`list-style-image: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'list-style-image sec-fetch-user - Not sent to non-trustworthy same-origin destination');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpSameSite']);
+
+    declarations.push(`background-image: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        })
+        .then(t.step_func_done(), (error) => t.unreached_func());
+  }, 'background-image sec-fetch-user - Not sent to non-trustworthy same-site destination');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpSameSite']);
+
+    declarations.push(`border-image: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'border-image sec-fetch-user - Not sent to non-trustworthy same-site destination');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpSameSite']);
+
+    declarations.push(`content: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'content sec-fetch-user - Not sent to non-trustworthy same-site destination');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpSameSite']);
+
+    declarations.push(`cursor: url("${url}"), auto;`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'cursor sec-fetch-user - Not sent to non-trustworthy same-site destination');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpSameSite']);
+
+    declarations.push(`list-style-image: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'list-style-image sec-fetch-user - Not sent to non-trustworthy same-site destination');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpCrossSite']);
+
+    declarations.push(`background-image: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        })
+        .then(t.step_func_done(), (error) => t.unreached_func());
+  }, 'background-image sec-fetch-user - Not sent to non-trustworthy cross-site destination');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpCrossSite']);
+
+    declarations.push(`border-image: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'border-image sec-fetch-user - Not sent to non-trustworthy cross-site destination');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpCrossSite']);
+
+    declarations.push(`content: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'content sec-fetch-user - Not sent to non-trustworthy cross-site destination');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpCrossSite']);
+
+    declarations.push(`cursor: url("${url}"), auto;`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'cursor sec-fetch-user - Not sent to non-trustworthy cross-site destination');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpCrossSite']);
+
+    declarations.push(`list-style-image: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'list-style-image sec-fetch-user - Not sent to non-trustworthy cross-site destination');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsOrigin', 'httpOrigin']);
+
+    declarations.push(`background-image: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        })
+        .then(t.step_func_done(), (error) => t.unreached_func());
+  }, 'background-image sec-fetch-site - HTTPS downgrade (header not sent)');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsOrigin', 'httpOrigin']);
+
+    declarations.push(`border-image: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'border-image sec-fetch-site - HTTPS downgrade (header not sent)');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsOrigin', 'httpOrigin']);
+
+    declarations.push(`content: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'content sec-fetch-site - HTTPS downgrade (header not sent)');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsOrigin', 'httpOrigin']);
+
+    declarations.push(`cursor: url("${url}"), auto;`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'cursor sec-fetch-site - HTTPS downgrade (header not sent)');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsOrigin', 'httpOrigin']);
+
+    declarations.push(`list-style-image: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'list-style-image sec-fetch-site - HTTPS downgrade (header not sent)');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpOrigin', 'httpsOrigin']);
+
+    declarations.push(`background-image: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_equals(headers['sec-fetch-site'], 'cross-site');
+        })
+        .then(t.step_func_done(), (error) => t.unreached_func());
+  }, 'background-image sec-fetch-site - HTTPS upgrade');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpOrigin', 'httpsOrigin']);
+
+    declarations.push(`border-image: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'border-image sec-fetch-site - HTTPS upgrade');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpOrigin', 'httpsOrigin']);
+
+    declarations.push(`content: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'content sec-fetch-site - HTTPS upgrade');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpOrigin', 'httpsOrigin']);
+
+    declarations.push(`cursor: url("${url}"), auto;`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'cursor sec-fetch-site - HTTPS upgrade');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpOrigin', 'httpsOrigin']);
+
+    declarations.push(`list-style-image: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'list-style-image sec-fetch-site - HTTPS upgrade');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsOrigin', 'httpOrigin', 'httpsOrigin']);
+
+    declarations.push(`background-image: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_equals(headers['sec-fetch-site'], 'cross-site');
+        })
+        .then(t.step_func_done(), (error) => t.unreached_func());
+  }, 'background-image sec-fetch-site - HTTPS downgrade-upgrade');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsOrigin', 'httpOrigin', 'httpsOrigin']);
+
+    declarations.push(`border-image: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'border-image sec-fetch-site - HTTPS downgrade-upgrade');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsOrigin', 'httpOrigin', 'httpsOrigin']);
+
+    declarations.push(`content: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'content sec-fetch-site - HTTPS downgrade-upgrade');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsOrigin', 'httpOrigin', 'httpsOrigin']);
+
+    declarations.push(`cursor: url("${url}"), auto;`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'cursor sec-fetch-site - HTTPS downgrade-upgrade');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsOrigin', 'httpOrigin', 'httpsOrigin']);
+
+    declarations.push(`list-style-image: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'list-style-image sec-fetch-site - HTTPS downgrade-upgrade');
+
+  iframe.srcdoc = declarations.map((declaration, index) => `
+    <style>.el${index} { ${declaration} }</style><div class="el${index}"></div>`
+    ).join('');
+  document.body.appendChild(iframe);
+
+  </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/fetch/metadata/generated/element-a.https.sub.html b/test/wpt/tests/fetch/metadata/generated/element-a.https.sub.html
new file mode 100644
index 00000000000..dffd36c73ee
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/generated/element-a.https.sub.html
@@ -0,0 +1,482 @@
+<!DOCTYPE html>
+<!--
+This test was procedurally generated. Please do not modify it directly.
+Sources:
+- fetch/metadata/tools/fetch-metadata.conf.yml
+- fetch/metadata/tools/templates/element-a.sub.html
+-->
+<html lang="en">
+  <meta charset="utf-8">
+  <meta name="timeout" content="long">
+  <title>HTTP headers on request for HTML "a" element navigation</title>
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  <script src="/resources/testdriver.js"></script>
+  <script src="/resources/testdriver-vendor.js"></script>
+  <script src="/fetch/metadata/resources/helper.sub.js"></script>
+  <body>
+  <script>
+  'use strict';
+
+  function induceRequest(url, {test, userActivated, attributes}) {
+    const win = window.open();
+    const anchor = win.document.createElement('a');
+    anchor.setAttribute('href', url);
+
+    for (const [ name, value ] of Object.entries(attributes)) {
+      anchor.setAttribute(name, value);
+    }
+
+    win.document.body.appendChild(anchor);
+
+    test.add_cleanup(() => win.close());
+
+    if (userActivated) {
+      test_driver.bless('enable user activation', () => anchor.click());
+    } else {
+      anchor.click();
+    }
+  }
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      makeRequestURL(key, ['httpsOrigin'], {mime: 'text/html'}),
+      {
+        test: t,
+        userActivated: false,
+        attributes: {}
+      }
+    );
+
+    // `induceRequest` does not necessarily trigger a navigation, so the Python
+    // handler must be polled until it has received the initial request.
+    return retrieve(key, {poll: true})
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-origin']);
+        });
+  }, 'sec-fetch-site - Same origin - no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      makeRequestURL(key, ['httpsCrossSite'], {mime: 'text/html'}),
+      {
+        test: t,
+        userActivated: false,
+        attributes: {}
+      }
+    );
+
+    // `induceRequest` does not necessarily trigger a navigation, so the Python
+    // handler must be polled until it has received the initial request.
+    return retrieve(key, {poll: true})
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Cross-site - no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      makeRequestURL(key, ['httpsSameSite'], {mime: 'text/html'}),
+      {
+        test: t,
+        userActivated: false,
+        attributes: {}
+      }
+    );
+
+    // `induceRequest` does not necessarily trigger a navigation, so the Python
+    // handler must be polled until it has received the initial request.
+    return retrieve(key, {poll: true})
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - Same site - no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      makeRequestURL(key, ['httpsOrigin', 'httpsCrossSite', 'httpsOrigin'], {mime: 'text/html'}),
+      {
+        test: t,
+        userActivated: false,
+        attributes: {}
+      }
+    );
+
+    // `induceRequest` does not necessarily trigger a navigation, so the Python
+    // handler must be polled until it has received the initial request.
+    return retrieve(key, {poll: true})
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Same-Origin -> Cross-Site -> Same-Origin redirect - no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      makeRequestURL(key, ['httpsOrigin', 'httpsSameSite', 'httpsOrigin'], {mime: 'text/html'}),
+      {
+        test: t,
+        userActivated: false,
+        attributes: {}
+      }
+    );
+
+    // `induceRequest` does not necessarily trigger a navigation, so the Python
+    // handler must be polled until it has received the initial request.
+    return retrieve(key, {poll: true})
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - Same-Origin -> Same-Site -> Same-Origin redirect - no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      makeRequestURL(key, ['httpsCrossSite', 'httpsOrigin'], {mime: 'text/html'}),
+      {
+        test: t,
+        userActivated: false,
+        attributes: {}
+      }
+    );
+
+    // `induceRequest` does not necessarily trigger a navigation, so the Python
+    // handler must be polled until it has received the initial request.
+    return retrieve(key, {poll: true})
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Cross-Site -> Same Origin - no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      makeRequestURL(key, ['httpsCrossSite', 'httpsSameSite'], {mime: 'text/html'}),
+      {
+        test: t,
+        userActivated: false,
+        attributes: {}
+      }
+    );
+
+    // `induceRequest` does not necessarily trigger a navigation, so the Python
+    // handler must be polled until it has received the initial request.
+    return retrieve(key, {poll: true})
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Cross-Site -> Same-Site - no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      makeRequestURL(key, ['httpsCrossSite', 'httpsCrossSite'], {mime: 'text/html'}),
+      {
+        test: t,
+        userActivated: false,
+        attributes: {}
+      }
+    );
+
+    // `induceRequest` does not necessarily trigger a navigation, so the Python
+    // handler must be polled until it has received the initial request.
+    return retrieve(key, {poll: true})
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Cross-Site -> Cross-Site - no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      makeRequestURL(key, ['httpsOrigin', 'httpsOrigin'], {mime: 'text/html'}),
+      {
+        test: t,
+        userActivated: false,
+        attributes: {}
+      }
+    );
+
+    // `induceRequest` does not necessarily trigger a navigation, so the Python
+    // handler must be polled until it has received the initial request.
+    return retrieve(key, {poll: true})
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-origin']);
+        });
+  }, 'sec-fetch-site - Same-Origin -> Same Origin - no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      makeRequestURL(key, ['httpsOrigin', 'httpsSameSite'], {mime: 'text/html'}),
+      {
+        test: t,
+        userActivated: false,
+        attributes: {}
+      }
+    );
+
+    // `induceRequest` does not necessarily trigger a navigation, so the Python
+    // handler must be polled until it has received the initial request.
+    return retrieve(key, {poll: true})
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - Same-Origin -> Same-Site - no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      makeRequestURL(key, ['httpsOrigin', 'httpsCrossSite'], {mime: 'text/html'}),
+      {
+        test: t,
+        userActivated: false,
+        attributes: {}
+      }
+    );
+
+    // `induceRequest` does not necessarily trigger a navigation, so the Python
+    // handler must be polled until it has received the initial request.
+    return retrieve(key, {poll: true})
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Same-Origin -> Cross-Site - no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      makeRequestURL(key, ['httpsSameSite', 'httpsOrigin'], {mime: 'text/html'}),
+      {
+        test: t,
+        userActivated: false,
+        attributes: {}
+      }
+    );
+
+    // `induceRequest` does not necessarily trigger a navigation, so the Python
+    // handler must be polled until it has received the initial request.
+    return retrieve(key, {poll: true})
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - Same-Site -> Same Origin - no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      makeRequestURL(key, ['httpsSameSite', 'httpsSameSite'], {mime: 'text/html'}),
+      {
+        test: t,
+        userActivated: false,
+        attributes: {}
+      }
+    );
+
+    // `induceRequest` does not necessarily trigger a navigation, so the Python
+    // handler must be polled until it has received the initial request.
+    return retrieve(key, {poll: true})
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - Same-Site -> Same-Site - no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      makeRequestURL(key, ['httpsSameSite', 'httpsCrossSite'], {mime: 'text/html'}),
+      {
+        test: t,
+        userActivated: false,
+        attributes: {}
+      }
+    );
+
+    // `induceRequest` does not necessarily trigger a navigation, so the Python
+    // handler must be polled until it has received the initial request.
+    return retrieve(key, {poll: true})
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Same-Site -> Cross-Site - no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      makeRequestURL(key, ['httpsOrigin', 'httpOrigin', 'httpsOrigin'], {mime: 'text/html'}),
+      {
+        test: t,
+        userActivated: false,
+        attributes: {}
+      }
+    );
+
+    // `induceRequest` does not necessarily trigger a navigation, so the Python
+    // handler must be polled until it has received the initial request.
+    return retrieve(key, {poll: true})
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - HTTPS downgrade-upgrade - no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      makeRequestURL(key, [], {mime: 'text/html'}),
+      {
+        test: t,
+        userActivated: false,
+        attributes: {}
+      }
+    );
+
+    // `induceRequest` does not necessarily trigger a navigation, so the Python
+    // handler must be polled until it has received the initial request.
+    return retrieve(key, {poll: true})
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-mode');
+          assert_array_equals(headers['sec-fetch-mode'], ['navigate']);
+        });
+  }, 'sec-fetch-mode - no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      makeRequestURL(key, [], {mime: 'text/html'}),
+      {
+        test: t,
+        userActivated: false,
+        attributes: {"download": ""}
+      }
+    );
+
+    // `induceRequest` does not necessarily trigger a navigation, so the Python
+    // handler must be polled until it has received the initial request.
+    return retrieve(key, {poll: true})
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-mode');
+          assert_array_equals(headers['sec-fetch-mode'], ['no-cors']);
+        });
+  }, 'sec-fetch-mode - attributes: download');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      makeRequestURL(key, [], {mime: 'text/html'}),
+      {
+        test: t,
+        userActivated: false,
+        attributes: {}
+      }
+    );
+
+    // `induceRequest` does not necessarily trigger a navigation, so the Python
+    // handler must be polled until it has received the initial request.
+    return retrieve(key, {poll: true})
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-dest');
+          assert_array_equals(headers['sec-fetch-dest'], ['document']);
+        });
+  }, 'sec-fetch-dest - no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      makeRequestURL(key, [], {mime: 'text/html'}),
+      {
+        test: t,
+        userActivated: false,
+        attributes: {"download": ""}
+      }
+    );
+
+    // `induceRequest` does not necessarily trigger a navigation, so the Python
+    // handler must be polled until it has received the initial request.
+    return retrieve(key, {poll: true})
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-dest');
+          assert_array_equals(headers['sec-fetch-dest'], ['empty']);
+        });
+  }, 'sec-fetch-dest - attributes: download');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      makeRequestURL(key, [], {mime: 'text/html'}),
+      {
+        test: t,
+        userActivated: false,
+        attributes: {}
+      }
+    );
+
+    // `induceRequest` does not necessarily trigger a navigation, so the Python
+    // handler must be polled until it has received the initial request.
+    return retrieve(key, {poll: true})
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user - no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      makeRequestURL(key, [], {mime: 'text/html'}),
+      {
+        test: t,
+        userActivated: true,
+        attributes: {}
+      }
+    );
+
+    // `induceRequest` does not necessarily trigger a navigation, so the Python
+    // handler must be polled until it has received the initial request.
+    return retrieve(key, {poll: true})
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-user');
+          assert_array_equals(headers['sec-fetch-user'], ['?1']);
+        });
+  }, 'sec-fetch-user - no attributes with user activation');
+  </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/fetch/metadata/generated/element-a.sub.html b/test/wpt/tests/fetch/metadata/generated/element-a.sub.html
new file mode 100644
index 00000000000..0661de3c871
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/generated/element-a.sub.html
@@ -0,0 +1,342 @@
+<!DOCTYPE html>
+<!--
+This test was procedurally generated. Please do not modify it directly.
+Sources:
+- fetch/metadata/tools/fetch-metadata.conf.yml
+- fetch/metadata/tools/templates/element-a.sub.html
+-->
+<html lang="en">
+  <meta charset="utf-8">
+  <meta name="timeout" content="long">
+  <title>HTTP headers on request for HTML "a" element navigation</title>
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  <script src="/fetch/metadata/resources/helper.sub.js"></script>
+  <body>
+  <script>
+  'use strict';
+
+  function induceRequest(url, {test, userActivated, attributes}) {
+    const win = window.open();
+    const anchor = win.document.createElement('a');
+    anchor.setAttribute('href', url);
+
+    for (const [ name, value ] of Object.entries(attributes)) {
+      anchor.setAttribute(name, value);
+    }
+
+    win.document.body.appendChild(anchor);
+
+    test.add_cleanup(() => win.close());
+
+    if (userActivated) {
+      test_driver.bless('enable user activation', () => anchor.click());
+    } else {
+      anchor.click();
+    }
+  }
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      makeRequestURL(key, ['httpOrigin'], {mime: 'text/html'}),
+      {
+        test: t,
+        userActivated: false,
+        attributes: {}
+      }
+    );
+
+    // `induceRequest` does not necessarily trigger a navigation, so the Python
+    // handler must be polled until it has received the initial request.
+    return retrieve(key, {poll: true})
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        });
+  }, 'sec-fetch-site - Not sent to non-trustworthy same-origin destination - no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      makeRequestURL(key, ['httpSameSite'], {mime: 'text/html'}),
+      {
+        test: t,
+        userActivated: false,
+        attributes: {}
+      }
+    );
+
+    // `induceRequest` does not necessarily trigger a navigation, so the Python
+    // handler must be polled until it has received the initial request.
+    return retrieve(key, {poll: true})
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        });
+  }, 'sec-fetch-site - Not sent to non-trustworthy same-site destination - no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      makeRequestURL(key, ['httpCrossSite'], {mime: 'text/html'}),
+      {
+        test: t,
+        userActivated: false,
+        attributes: {}
+      }
+    );
+
+    // `induceRequest` does not necessarily trigger a navigation, so the Python
+    // handler must be polled until it has received the initial request.
+    return retrieve(key, {poll: true})
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        });
+  }, 'sec-fetch-site - Not sent to non-trustworthy cross-site destination - no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      makeRequestURL(key, ['httpOrigin'], {mime: 'text/html'}),
+      {
+        test: t,
+        userActivated: false,
+        attributes: {}
+      }
+    );
+
+    // `induceRequest` does not necessarily trigger a navigation, so the Python
+    // handler must be polled until it has received the initial request.
+    return retrieve(key, {poll: true})
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-mode');
+        });
+  }, 'sec-fetch-mode - Not sent to non-trustworthy same-origin destination - no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      makeRequestURL(key, ['httpSameSite'], {mime: 'text/html'}),
+      {
+        test: t,
+        userActivated: false,
+        attributes: {}
+      }
+    );
+
+    // `induceRequest` does not necessarily trigger a navigation, so the Python
+    // handler must be polled until it has received the initial request.
+    return retrieve(key, {poll: true})
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-mode');
+        });
+  }, 'sec-fetch-mode - Not sent to non-trustworthy same-site destination - no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      makeRequestURL(key, ['httpCrossSite'], {mime: 'text/html'}),
+      {
+        test: t,
+        userActivated: false,
+        attributes: {}
+      }
+    );
+
+    // `induceRequest` does not necessarily trigger a navigation, so the Python
+    // handler must be polled until it has received the initial request.
+    return retrieve(key, {poll: true})
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-mode');
+        });
+  }, 'sec-fetch-mode - Not sent to non-trustworthy cross-site destination - no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      makeRequestURL(key, ['httpOrigin'], {mime: 'text/html'}),
+      {
+        test: t,
+        userActivated: false,
+        attributes: {}
+      }
+    );
+
+    // `induceRequest` does not necessarily trigger a navigation, so the Python
+    // handler must be polled until it has received the initial request.
+    return retrieve(key, {poll: true})
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-dest');
+        });
+  }, 'sec-fetch-dest - Not sent to non-trustworthy same-origin destination - no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      makeRequestURL(key, ['httpSameSite'], {mime: 'text/html'}),
+      {
+        test: t,
+        userActivated: false,
+        attributes: {}
+      }
+    );
+
+    // `induceRequest` does not necessarily trigger a navigation, so the Python
+    // handler must be polled until it has received the initial request.
+    return retrieve(key, {poll: true})
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-dest');
+        });
+  }, 'sec-fetch-dest - Not sent to non-trustworthy same-site destination - no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      makeRequestURL(key, ['httpCrossSite'], {mime: 'text/html'}),
+      {
+        test: t,
+        userActivated: false,
+        attributes: {}
+      }
+    );
+
+    // `induceRequest` does not necessarily trigger a navigation, so the Python
+    // handler must be polled until it has received the initial request.
+    return retrieve(key, {poll: true})
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-dest');
+        });
+  }, 'sec-fetch-dest - Not sent to non-trustworthy cross-site destination - no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      makeRequestURL(key, ['httpOrigin'], {mime: 'text/html'}),
+      {
+        test: t,
+        userActivated: false,
+        attributes: {}
+      }
+    );
+
+    // `induceRequest` does not necessarily trigger a navigation, so the Python
+    // handler must be polled until it has received the initial request.
+    return retrieve(key, {poll: true})
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user - Not sent to non-trustworthy same-origin destination - no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      makeRequestURL(key, ['httpSameSite'], {mime: 'text/html'}),
+      {
+        test: t,
+        userActivated: false,
+        attributes: {}
+      }
+    );
+
+    // `induceRequest` does not necessarily trigger a navigation, so the Python
+    // handler must be polled until it has received the initial request.
+    return retrieve(key, {poll: true})
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user - Not sent to non-trustworthy same-site destination - no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      makeRequestURL(key, ['httpCrossSite'], {mime: 'text/html'}),
+      {
+        test: t,
+        userActivated: false,
+        attributes: {}
+      }
+    );
+
+    // `induceRequest` does not necessarily trigger a navigation, so the Python
+    // handler must be polled until it has received the initial request.
+    return retrieve(key, {poll: true})
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user - Not sent to non-trustworthy cross-site destination - no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      makeRequestURL(key, ['httpsOrigin', 'httpOrigin'], {mime: 'text/html'}),
+      {
+        test: t,
+        userActivated: false,
+        attributes: {}
+      }
+    );
+
+    // `induceRequest` does not necessarily trigger a navigation, so the Python
+    // handler must be polled until it has received the initial request.
+    return retrieve(key, {poll: true})
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        });
+  }, 'sec-fetch-site - HTTPS downgrade (header not sent) - no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      makeRequestURL(key, ['httpOrigin', 'httpsOrigin'], {mime: 'text/html'}),
+      {
+        test: t,
+        userActivated: false,
+        attributes: {}
+      }
+    );
+
+    // `induceRequest` does not necessarily trigger a navigation, so the Python
+    // handler must be polled until it has received the initial request.
+    return retrieve(key, {poll: true})
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - HTTPS upgrade - no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      makeRequestURL(key, ['httpsOrigin', 'httpOrigin', 'httpsOrigin'], {mime: 'text/html'}),
+      {
+        test: t,
+        userActivated: false,
+        attributes: {}
+      }
+    );
+
+    // `induceRequest` does not necessarily trigger a navigation, so the Python
+    // handler must be polled until it has received the initial request.
+    return retrieve(key, {poll: true})
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - HTTPS downgrade-upgrade - no attributes');
+  </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/fetch/metadata/generated/element-area.https.sub.html b/test/wpt/tests/fetch/metadata/generated/element-area.https.sub.html
new file mode 100644
index 00000000000..be3f5f9b621
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/generated/element-area.https.sub.html
@@ -0,0 +1,482 @@
+<!DOCTYPE html>
+<!--
+This test was procedurally generated. Please do not modify it directly.
+Sources:
+- fetch/metadata/tools/fetch-metadata.conf.yml
+- fetch/metadata/tools/templates/element-area.sub.html
+-->
+<html lang="en">
+  <meta charset="utf-8">
+  <meta name="timeout" content="long">
+  <title>HTTP headers on request for HTML "area" element navigation</title>
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  <script src="/resources/testdriver.js"></script>
+  <script src="/resources/testdriver-vendor.js"></script>
+  <script src="/fetch/metadata/resources/helper.sub.js"></script>
+  <body>
+  <script>
+  'use strict';
+
+  function induceRequest(url, {test, userActivated, attributes}) {
+    const win = window.open();
+    const area = win.document.createElement('area');
+    area.setAttribute('href', url);
+
+    for (const [ name, value ] of Object.entries(attributes)) {
+      area.setAttribute(name, value);
+    }
+
+    win.document.body.appendChild(area);
+
+    test.add_cleanup(() => win.close());
+
+    if (userActivated) {
+      test_driver.bless('enable user activation', () => area.click());
+    } else {
+      area.click();
+    }
+  }
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      makeRequestURL(key, ['httpsOrigin'], {mime: 'text/html'}),
+      {
+        test: t,
+        userActivated: false,
+        attributes: {}
+      }
+    );
+
+    // `induceRequest` does not necessarily trigger a navigation, so the Python
+    // handler must be polled until it has received the initial request.
+    return retrieve(key, {poll: true})
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-origin']);
+        });
+  }, 'sec-fetch-site - Same origin - no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      makeRequestURL(key, ['httpsCrossSite'], {mime: 'text/html'}),
+      {
+        test: t,
+        userActivated: false,
+        attributes: {}
+      }
+    );
+
+    // `induceRequest` does not necessarily trigger a navigation, so the Python
+    // handler must be polled until it has received the initial request.
+    return retrieve(key, {poll: true})
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Cross-site - no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      makeRequestURL(key, ['httpsSameSite'], {mime: 'text/html'}),
+      {
+        test: t,
+        userActivated: false,
+        attributes: {}
+      }
+    );
+
+    // `induceRequest` does not necessarily trigger a navigation, so the Python
+    // handler must be polled until it has received the initial request.
+    return retrieve(key, {poll: true})
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - Same site - no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      makeRequestURL(key, ['httpsOrigin', 'httpsCrossSite', 'httpsOrigin'], {mime: 'text/html'}),
+      {
+        test: t,
+        userActivated: false,
+        attributes: {}
+      }
+    );
+
+    // `induceRequest` does not necessarily trigger a navigation, so the Python
+    // handler must be polled until it has received the initial request.
+    return retrieve(key, {poll: true})
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Same-Origin -> Cross-Site -> Same-Origin redirect - no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      makeRequestURL(key, ['httpsOrigin', 'httpsSameSite', 'httpsOrigin'], {mime: 'text/html'}),
+      {
+        test: t,
+        userActivated: false,
+        attributes: {}
+      }
+    );
+
+    // `induceRequest` does not necessarily trigger a navigation, so the Python
+    // handler must be polled until it has received the initial request.
+    return retrieve(key, {poll: true})
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - Same-Origin -> Same-Site -> Same-Origin redirect - no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      makeRequestURL(key, ['httpsCrossSite', 'httpsOrigin'], {mime: 'text/html'}),
+      {
+        test: t,
+        userActivated: false,
+        attributes: {}
+      }
+    );
+
+    // `induceRequest` does not necessarily trigger a navigation, so the Python
+    // handler must be polled until it has received the initial request.
+    return retrieve(key, {poll: true})
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Cross-Site -> Same Origin - no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      makeRequestURL(key, ['httpsCrossSite', 'httpsSameSite'], {mime: 'text/html'}),
+      {
+        test: t,
+        userActivated: false,
+        attributes: {}
+      }
+    );
+
+    // `induceRequest` does not necessarily trigger a navigation, so the Python
+    // handler must be polled until it has received the initial request.
+    return retrieve(key, {poll: true})
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Cross-Site -> Same-Site - no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      makeRequestURL(key, ['httpsCrossSite', 'httpsCrossSite'], {mime: 'text/html'}),
+      {
+        test: t,
+        userActivated: false,
+        attributes: {}
+      }
+    );
+
+    // `induceRequest` does not necessarily trigger a navigation, so the Python
+    // handler must be polled until it has received the initial request.
+    return retrieve(key, {poll: true})
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Cross-Site -> Cross-Site - no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      makeRequestURL(key, ['httpsOrigin', 'httpsOrigin'], {mime: 'text/html'}),
+      {
+        test: t,
+        userActivated: false,
+        attributes: {}
+      }
+    );
+
+    // `induceRequest` does not necessarily trigger a navigation, so the Python
+    // handler must be polled until it has received the initial request.
+    return retrieve(key, {poll: true})
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-origin']);
+        });
+  }, 'sec-fetch-site - Same-Origin -> Same Origin - no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      makeRequestURL(key, ['httpsOrigin', 'httpsSameSite'], {mime: 'text/html'}),
+      {
+        test: t,
+        userActivated: false,
+        attributes: {}
+      }
+    );
+
+    // `induceRequest` does not necessarily trigger a navigation, so the Python
+    // handler must be polled until it has received the initial request.
+    return retrieve(key, {poll: true})
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - Same-Origin -> Same-Site - no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      makeRequestURL(key, ['httpsOrigin', 'httpsCrossSite'], {mime: 'text/html'}),
+      {
+        test: t,
+        userActivated: false,
+        attributes: {}
+      }
+    );
+
+    // `induceRequest` does not necessarily trigger a navigation, so the Python
+    // handler must be polled until it has received the initial request.
+    return retrieve(key, {poll: true})
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Same-Origin -> Cross-Site - no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      makeRequestURL(key, ['httpsSameSite', 'httpsOrigin'], {mime: 'text/html'}),
+      {
+        test: t,
+        userActivated: false,
+        attributes: {}
+      }
+    );
+
+    // `induceRequest` does not necessarily trigger a navigation, so the Python
+    // handler must be polled until it has received the initial request.
+    return retrieve(key, {poll: true})
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - Same-Site -> Same Origin - no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      makeRequestURL(key, ['httpsSameSite', 'httpsSameSite'], {mime: 'text/html'}),
+      {
+        test: t,
+        userActivated: false,
+        attributes: {}
+      }
+    );
+
+    // `induceRequest` does not necessarily trigger a navigation, so the Python
+    // handler must be polled until it has received the initial request.
+    return retrieve(key, {poll: true})
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - Same-Site -> Same-Site - no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      makeRequestURL(key, ['httpsSameSite', 'httpsCrossSite'], {mime: 'text/html'}),
+      {
+        test: t,
+        userActivated: false,
+        attributes: {}
+      }
+    );
+
+    // `induceRequest` does not necessarily trigger a navigation, so the Python
+    // handler must be polled until it has received the initial request.
+    return retrieve(key, {poll: true})
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Same-Site -> Cross-Site - no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      makeRequestURL(key, ['httpsOrigin', 'httpOrigin', 'httpsOrigin'], {mime: 'text/html'}),
+      {
+        test: t,
+        userActivated: false,
+        attributes: {}
+      }
+    );
+
+    // `induceRequest` does not necessarily trigger a navigation, so the Python
+    // handler must be polled until it has received the initial request.
+    return retrieve(key, {poll: true})
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - HTTPS downgrade-upgrade - no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      makeRequestURL(key, [], {mime: 'text/html'}),
+      {
+        test: t,
+        userActivated: false,
+        attributes: {}
+      }
+    );
+
+    // `induceRequest` does not necessarily trigger a navigation, so the Python
+    // handler must be polled until it has received the initial request.
+    return retrieve(key, {poll: true})
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-mode');
+          assert_array_equals(headers['sec-fetch-mode'], ['navigate']);
+        });
+  }, 'sec-fetch-mode - no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      makeRequestURL(key, [], {mime: 'text/html'}),
+      {
+        test: t,
+        userActivated: false,
+        attributes: {"download": ""}
+      }
+    );
+
+    // `induceRequest` does not necessarily trigger a navigation, so the Python
+    // handler must be polled until it has received the initial request.
+    return retrieve(key, {poll: true})
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-mode');
+          assert_array_equals(headers['sec-fetch-mode'], ['no-cors']);
+        });
+  }, 'sec-fetch-mode - attributes: download');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      makeRequestURL(key, [], {mime: 'text/html'}),
+      {
+        test: t,
+        userActivated: false,
+        attributes: {}
+      }
+    );
+
+    // `induceRequest` does not necessarily trigger a navigation, so the Python
+    // handler must be polled until it has received the initial request.
+    return retrieve(key, {poll: true})
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-dest');
+          assert_array_equals(headers['sec-fetch-dest'], ['document']);
+        });
+  }, 'sec-fetch-dest - no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      makeRequestURL(key, [], {mime: 'text/html'}),
+      {
+        test: t,
+        userActivated: false,
+        attributes: {"download": ""}
+      }
+    );
+
+    // `induceRequest` does not necessarily trigger a navigation, so the Python
+    // handler must be polled until it has received the initial request.
+    return retrieve(key, {poll: true})
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-dest');
+          assert_array_equals(headers['sec-fetch-dest'], ['empty']);
+        });
+  }, 'sec-fetch-dest - attributes: download');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      makeRequestURL(key, [], {mime: 'text/html'}),
+      {
+        test: t,
+        userActivated: false,
+        attributes: {}
+      }
+    );
+
+    // `induceRequest` does not necessarily trigger a navigation, so the Python
+    // handler must be polled until it has received the initial request.
+    return retrieve(key, {poll: true})
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user - no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      makeRequestURL(key, [], {mime: 'text/html'}),
+      {
+        test: t,
+        userActivated: true,
+        attributes: {}
+      }
+    );
+
+    // `induceRequest` does not necessarily trigger a navigation, so the Python
+    // handler must be polled until it has received the initial request.
+    return retrieve(key, {poll: true})
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-user');
+          assert_array_equals(headers['sec-fetch-user'], ['?1']);
+        });
+  }, 'sec-fetch-user - no attributes with user activation');
+  </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/fetch/metadata/generated/element-area.sub.html b/test/wpt/tests/fetch/metadata/generated/element-area.sub.html
new file mode 100644
index 00000000000..5f5c338324f
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/generated/element-area.sub.html
@@ -0,0 +1,342 @@
+<!DOCTYPE html>
+<!--
+This test was procedurally generated. Please do not modify it directly.
+Sources:
+- fetch/metadata/tools/fetch-metadata.conf.yml
+- fetch/metadata/tools/templates/element-area.sub.html
+-->
+<html lang="en">
+  <meta charset="utf-8">
+  <meta name="timeout" content="long">
+  <title>HTTP headers on request for HTML "area" element navigation</title>
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  <script src="/fetch/metadata/resources/helper.sub.js"></script>
+  <body>
+  <script>
+  'use strict';
+
+  function induceRequest(url, {test, userActivated, attributes}) {
+    const win = window.open();
+    const area = win.document.createElement('area');
+    area.setAttribute('href', url);
+
+    for (const [ name, value ] of Object.entries(attributes)) {
+      area.setAttribute(name, value);
+    }
+
+    win.document.body.appendChild(area);
+
+    test.add_cleanup(() => win.close());
+
+    if (userActivated) {
+      test_driver.bless('enable user activation', () => area.click());
+    } else {
+      area.click();
+    }
+  }
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      makeRequestURL(key, ['httpOrigin'], {mime: 'text/html'}),
+      {
+        test: t,
+        userActivated: false,
+        attributes: {}
+      }
+    );
+
+    // `induceRequest` does not necessarily trigger a navigation, so the Python
+    // handler must be polled until it has received the initial request.
+    return retrieve(key, {poll: true})
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        });
+  }, 'sec-fetch-site - Not sent to non-trustworthy same-origin destination - no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      makeRequestURL(key, ['httpSameSite'], {mime: 'text/html'}),
+      {
+        test: t,
+        userActivated: false,
+        attributes: {}
+      }
+    );
+
+    // `induceRequest` does not necessarily trigger a navigation, so the Python
+    // handler must be polled until it has received the initial request.
+    return retrieve(key, {poll: true})
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        });
+  }, 'sec-fetch-site - Not sent to non-trustworthy same-site destination - no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      makeRequestURL(key, ['httpCrossSite'], {mime: 'text/html'}),
+      {
+        test: t,
+        userActivated: false,
+        attributes: {}
+      }
+    );
+
+    // `induceRequest` does not necessarily trigger a navigation, so the Python
+    // handler must be polled until it has received the initial request.
+    return retrieve(key, {poll: true})
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        });
+  }, 'sec-fetch-site - Not sent to non-trustworthy cross-site destination - no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      makeRequestURL(key, ['httpOrigin'], {mime: 'text/html'}),
+      {
+        test: t,
+        userActivated: false,
+        attributes: {}
+      }
+    );
+
+    // `induceRequest` does not necessarily trigger a navigation, so the Python
+    // handler must be polled until it has received the initial request.
+    return retrieve(key, {poll: true})
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-mode');
+        });
+  }, 'sec-fetch-mode - Not sent to non-trustworthy same-origin destination - no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      makeRequestURL(key, ['httpSameSite'], {mime: 'text/html'}),
+      {
+        test: t,
+        userActivated: false,
+        attributes: {}
+      }
+    );
+
+    // `induceRequest` does not necessarily trigger a navigation, so the Python
+    // handler must be polled until it has received the initial request.
+    return retrieve(key, {poll: true})
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-mode');
+        });
+  }, 'sec-fetch-mode - Not sent to non-trustworthy same-site destination - no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      makeRequestURL(key, ['httpCrossSite'], {mime: 'text/html'}),
+      {
+        test: t,
+        userActivated: false,
+        attributes: {}
+      }
+    );
+
+    // `induceRequest` does not necessarily trigger a navigation, so the Python
+    // handler must be polled until it has received the initial request.
+    return retrieve(key, {poll: true})
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-mode');
+        });
+  }, 'sec-fetch-mode - Not sent to non-trustworthy cross-site destination - no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      makeRequestURL(key, ['httpOrigin'], {mime: 'text/html'}),
+      {
+        test: t,
+        userActivated: false,
+        attributes: {}
+      }
+    );
+
+    // `induceRequest` does not necessarily trigger a navigation, so the Python
+    // handler must be polled until it has received the initial request.
+    return retrieve(key, {poll: true})
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-dest');
+        });
+  }, 'sec-fetch-dest - Not sent to non-trustworthy same-origin destination - no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      makeRequestURL(key, ['httpSameSite'], {mime: 'text/html'}),
+      {
+        test: t,
+        userActivated: false,
+        attributes: {}
+      }
+    );
+
+    // `induceRequest` does not necessarily trigger a navigation, so the Python
+    // handler must be polled until it has received the initial request.
+    return retrieve(key, {poll: true})
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-dest');
+        });
+  }, 'sec-fetch-dest - Not sent to non-trustworthy same-site destination - no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      makeRequestURL(key, ['httpCrossSite'], {mime: 'text/html'}),
+      {
+        test: t,
+        userActivated: false,
+        attributes: {}
+      }
+    );
+
+    // `induceRequest` does not necessarily trigger a navigation, so the Python
+    // handler must be polled until it has received the initial request.
+    return retrieve(key, {poll: true})
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-dest');
+        });
+  }, 'sec-fetch-dest - Not sent to non-trustworthy cross-site destination - no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      makeRequestURL(key, ['httpOrigin'], {mime: 'text/html'}),
+      {
+        test: t,
+        userActivated: false,
+        attributes: {}
+      }
+    );
+
+    // `induceRequest` does not necessarily trigger a navigation, so the Python
+    // handler must be polled until it has received the initial request.
+    return retrieve(key, {poll: true})
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user - Not sent to non-trustworthy same-origin destination - no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      makeRequestURL(key, ['httpSameSite'], {mime: 'text/html'}),
+      {
+        test: t,
+        userActivated: false,
+        attributes: {}
+      }
+    );
+
+    // `induceRequest` does not necessarily trigger a navigation, so the Python
+    // handler must be polled until it has received the initial request.
+    return retrieve(key, {poll: true})
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user - Not sent to non-trustworthy same-site destination - no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      makeRequestURL(key, ['httpCrossSite'], {mime: 'text/html'}),
+      {
+        test: t,
+        userActivated: false,
+        attributes: {}
+      }
+    );
+
+    // `induceRequest` does not necessarily trigger a navigation, so the Python
+    // handler must be polled until it has received the initial request.
+    return retrieve(key, {poll: true})
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user - Not sent to non-trustworthy cross-site destination - no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      makeRequestURL(key, ['httpsOrigin', 'httpOrigin'], {mime: 'text/html'}),
+      {
+        test: t,
+        userActivated: false,
+        attributes: {}
+      }
+    );
+
+    // `induceRequest` does not necessarily trigger a navigation, so the Python
+    // handler must be polled until it has received the initial request.
+    return retrieve(key, {poll: true})
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        });
+  }, 'sec-fetch-site - HTTPS downgrade (header not sent) - no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      makeRequestURL(key, ['httpOrigin', 'httpsOrigin'], {mime: 'text/html'}),
+      {
+        test: t,
+        userActivated: false,
+        attributes: {}
+      }
+    );
+
+    // `induceRequest` does not necessarily trigger a navigation, so the Python
+    // handler must be polled until it has received the initial request.
+    return retrieve(key, {poll: true})
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - HTTPS upgrade - no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      makeRequestURL(key, ['httpsOrigin', 'httpOrigin', 'httpsOrigin'], {mime: 'text/html'}),
+      {
+        test: t,
+        userActivated: false,
+        attributes: {}
+      }
+    );
+
+    // `induceRequest` does not necessarily trigger a navigation, so the Python
+    // handler must be polled until it has received the initial request.
+    return retrieve(key, {poll: true})
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - HTTPS downgrade-upgrade - no attributes');
+  </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/fetch/metadata/generated/element-audio.https.sub.html b/test/wpt/tests/fetch/metadata/generated/element-audio.https.sub.html
new file mode 100644
index 00000000000..a9d951233e2
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/generated/element-audio.https.sub.html
@@ -0,0 +1,325 @@
+<!DOCTYPE html>
+<!--
+This test was procedurally generated. Please do not modify it directly.
+Sources:
+- fetch/metadata/tools/fetch-metadata.conf.yml
+- fetch/metadata/tools/templates/element-audio.sub.html
+-->
+<html lang="en">
+  <meta charset="utf-8">
+  <title>HTTP headers on request for HTML "audio" element source</title>
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  <script src="/fetch/metadata/resources/helper.sub.js"></script>
+  <body>
+  <script>
+  'use strict';
+
+  function induceRequest(url, attributes) {
+    const audio = document.createElement('audio');
+
+    for (const [ name, value ] of Object.entries(attributes)) {
+      audio.setAttribute(name, value);
+    }
+
+    return new Promise((resolve) => {
+        audio.setAttribute('src', url);
+        audio.onload = audio.onerror = resolve;
+      });
+  }
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsOrigin']),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-origin']);
+        });
+  }, 'sec-fetch-site - Same origin, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsCrossSite']),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Cross-site, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsSameSite']),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - Same site, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsOrigin', 'httpsCrossSite', 'httpsOrigin']),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Same-Origin -> Cross-Site -> Same-Origin redirect, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsOrigin', 'httpsSameSite', 'httpsOrigin']),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - Same-Origin -> Same-Site -> Same-Origin redirect, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsCrossSite', 'httpsOrigin']),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Cross-Site -> Same Origin, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsCrossSite', 'httpsSameSite']),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Cross-Site -> Same-Site, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsCrossSite', 'httpsCrossSite']),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Cross-Site -> Cross-Site, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsOrigin', 'httpsOrigin']),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-origin']);
+        });
+  }, 'sec-fetch-site - Same-Origin -> Same Origin, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsOrigin', 'httpsSameSite']),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - Same-Origin -> Same-Site, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsOrigin', 'httpsCrossSite']),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Same-Origin -> Cross-Site, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsSameSite', 'httpsOrigin']),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - Same-Site -> Same Origin, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsSameSite', 'httpsSameSite']),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - Same-Site -> Same-Site, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsSameSite', 'httpsCrossSite']),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Same-Site -> Cross-Site, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsOrigin', 'httpOrigin', 'httpsOrigin']),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - HTTPS downgrade-upgrade, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, []),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-mode');
+          assert_array_equals(headers['sec-fetch-mode'], ['no-cors']);
+        });
+  }, 'sec-fetch-mode - no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, []),
+        {"crossorigin": ""}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-mode');
+          assert_array_equals(headers['sec-fetch-mode'], ['cors']);
+        });
+  }, 'sec-fetch-mode - attributes: crossorigin');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, []),
+        {"crossorigin": "anonymous"}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-mode');
+          assert_array_equals(headers['sec-fetch-mode'], ['cors']);
+        });
+  }, 'sec-fetch-mode - attributes: crossorigin=anonymous');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, []),
+        {"crossorigin": "use-credentials"}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-mode');
+          assert_array_equals(headers['sec-fetch-mode'], ['cors']);
+        });
+  }, 'sec-fetch-mode - attributes: crossorigin=use-credentials');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, []),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-dest');
+          assert_array_equals(headers['sec-fetch-dest'], ['audio']);
+        });
+  }, 'sec-fetch-dest - no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, []),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user - no attributes');
+  </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/fetch/metadata/generated/element-audio.sub.html b/test/wpt/tests/fetch/metadata/generated/element-audio.sub.html
new file mode 100644
index 00000000000..2b62632ac2e
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/generated/element-audio.sub.html
@@ -0,0 +1,229 @@
+<!DOCTYPE html>
+<!--
+This test was procedurally generated. Please do not modify it directly.
+Sources:
+- fetch/metadata/tools/fetch-metadata.conf.yml
+- fetch/metadata/tools/templates/element-audio.sub.html
+-->
+<html lang="en">
+  <meta charset="utf-8">
+  <title>HTTP headers on request for HTML "audio" element source</title>
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  <script src="/fetch/metadata/resources/helper.sub.js"></script>
+  <body>
+  <script>
+  'use strict';
+
+  function induceRequest(url, attributes) {
+    const audio = document.createElement('audio');
+
+    for (const [ name, value ] of Object.entries(attributes)) {
+      audio.setAttribute(name, value);
+    }
+
+    return new Promise((resolve) => {
+        audio.setAttribute('src', url);
+        audio.onload = audio.onerror = resolve;
+      });
+  }
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpOrigin']),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        });
+  }, 'sec-fetch-site - Not sent to non-trustworthy same-origin destination, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpSameSite']),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        });
+  }, 'sec-fetch-site - Not sent to non-trustworthy same-site destination, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpCrossSite']),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        });
+  }, 'sec-fetch-site - Not sent to non-trustworthy cross-site destination, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpOrigin']),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-mode');
+        });
+  }, 'sec-fetch-mode - Not sent to non-trustworthy same-origin destination, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpSameSite']),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-mode');
+        });
+  }, 'sec-fetch-mode - Not sent to non-trustworthy same-site destination, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpCrossSite']),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-mode');
+        });
+  }, 'sec-fetch-mode - Not sent to non-trustworthy cross-site destination, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpOrigin']),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-dest');
+        });
+  }, 'sec-fetch-dest - Not sent to non-trustworthy same-origin destination, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpSameSite']),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-dest');
+        });
+  }, 'sec-fetch-dest - Not sent to non-trustworthy same-site destination, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpCrossSite']),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-dest');
+        });
+  }, 'sec-fetch-dest - Not sent to non-trustworthy cross-site destination, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpOrigin']),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user - Not sent to non-trustworthy same-origin destination, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpSameSite']),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user - Not sent to non-trustworthy same-site destination, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpCrossSite']),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user - Not sent to non-trustworthy cross-site destination, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsOrigin', 'httpOrigin']),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        });
+  }, 'sec-fetch-site - HTTPS downgrade (header not sent), no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpOrigin', 'httpsOrigin']),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - HTTPS upgrade, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsOrigin', 'httpOrigin', 'httpsOrigin']),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - HTTPS downgrade-upgrade, no attributes');
+  </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/fetch/metadata/generated/element-embed.https.sub.html b/test/wpt/tests/fetch/metadata/generated/element-embed.https.sub.html
new file mode 100644
index 00000000000..819bed888ee
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/generated/element-embed.https.sub.html
@@ -0,0 +1,224 @@
+<!DOCTYPE html>
+<!--
+This test was procedurally generated. Please do not modify it directly.
+Sources:
+- fetch/metadata/tools/fetch-metadata.conf.yml
+- fetch/metadata/tools/templates/element-embed.sub.html
+-->
+<html lang="en">
+  <meta charset="utf-8">
+  <title>HTTP headers on request for HTML "embed" element source</title>
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  <script src="/fetch/metadata/resources/helper.sub.js"></script>
+  <body>
+  <script>
+  'use strict';
+
+  const params = {
+    body: `
+      <svg xmlns="http://www.w3.org/2000/svg" width="123" height="123">
+        <rect fill="lime" width="123" height="123"/>
+      </svg>
+    `,
+    mime: 'image/svg+xml'
+  };
+
+  function induceRequest(t, url) {
+    const embed = document.createElement('embed');
+    embed.setAttribute('src', url);
+    document.body.appendChild(embed);
+
+    t.add_cleanup(() => embed.remove());
+
+    return new Promise((resolve) => embed.addEventListener('load', resolve));
+  }
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(t, makeRequestURL(key, ['httpsOrigin'], params))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-origin']);
+      });
+  }, 'sec-fetch-site - Same origin');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(t, makeRequestURL(key, ['httpsCrossSite'], params))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+      });
+  }, 'sec-fetch-site - Cross-site');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(t, makeRequestURL(key, ['httpsSameSite'], params))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+      });
+  }, 'sec-fetch-site - Same site');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(t, makeRequestURL(key, ['httpsOrigin', 'httpsCrossSite', 'httpsOrigin'], params))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+      });
+  }, 'sec-fetch-site - Same-Origin -> Cross-Site -> Same-Origin redirect');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(t, makeRequestURL(key, ['httpsOrigin', 'httpsSameSite', 'httpsOrigin'], params))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+      });
+  }, 'sec-fetch-site - Same-Origin -> Same-Site -> Same-Origin redirect');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(t, makeRequestURL(key, ['httpsCrossSite', 'httpsOrigin'], params))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+      });
+  }, 'sec-fetch-site - Cross-Site -> Same Origin');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(t, makeRequestURL(key, ['httpsCrossSite', 'httpsSameSite'], params))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+      });
+  }, 'sec-fetch-site - Cross-Site -> Same-Site');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(t, makeRequestURL(key, ['httpsCrossSite', 'httpsCrossSite'], params))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+      });
+  }, 'sec-fetch-site - Cross-Site -> Cross-Site');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(t, makeRequestURL(key, ['httpsOrigin', 'httpsOrigin'], params))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-origin']);
+      });
+  }, 'sec-fetch-site - Same-Origin -> Same Origin');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(t, makeRequestURL(key, ['httpsOrigin', 'httpsSameSite'], params))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+      });
+  }, 'sec-fetch-site - Same-Origin -> Same-Site');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(t, makeRequestURL(key, ['httpsOrigin', 'httpsCrossSite'], params))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+      });
+  }, 'sec-fetch-site - Same-Origin -> Cross-Site');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(t, makeRequestURL(key, ['httpsSameSite', 'httpsOrigin'], params))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+      });
+  }, 'sec-fetch-site - Same-Site -> Same Origin');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(t, makeRequestURL(key, ['httpsSameSite', 'httpsSameSite'], params))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+      });
+  }, 'sec-fetch-site - Same-Site -> Same-Site');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(t, makeRequestURL(key, ['httpsSameSite', 'httpsCrossSite'], params))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+      });
+  }, 'sec-fetch-site - Same-Site -> Cross-Site');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(t, makeRequestURL(key, [], params))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-mode');
+          assert_array_equals(headers['sec-fetch-mode'], ['no-cors']);
+      });
+  }, 'sec-fetch-mode');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(t, makeRequestURL(key, [], params))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-dest');
+          assert_array_equals(headers['sec-fetch-dest'], ['embed']);
+      });
+  }, 'sec-fetch-dest');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(t, makeRequestURL(key, [], params))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+      });
+  }, 'sec-fetch-user');
+  </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/fetch/metadata/generated/element-embed.sub.html b/test/wpt/tests/fetch/metadata/generated/element-embed.sub.html
new file mode 100644
index 00000000000..b6e14a55e4a
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/generated/element-embed.sub.html
@@ -0,0 +1,190 @@
+<!DOCTYPE html>
+<!--
+This test was procedurally generated. Please do not modify it directly.
+Sources:
+- fetch/metadata/tools/fetch-metadata.conf.yml
+- fetch/metadata/tools/templates/element-embed.sub.html
+-->
+<html lang="en">
+  <meta charset="utf-8">
+  <title>HTTP headers on request for HTML "embed" element source</title>
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  <script src="/fetch/metadata/resources/helper.sub.js"></script>
+  <body>
+  <script>
+  'use strict';
+
+  const params = {
+    body: `
+      <svg xmlns="http://www.w3.org/2000/svg" width="123" height="123">
+        <rect fill="lime" width="123" height="123"/>
+      </svg>
+    `,
+    mime: 'image/svg+xml'
+  };
+
+  function induceRequest(t, url) {
+    const embed = document.createElement('embed');
+    embed.setAttribute('src', url);
+    document.body.appendChild(embed);
+
+    t.add_cleanup(() => embed.remove());
+
+    return new Promise((resolve) => embed.addEventListener('load', resolve));
+  }
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(t, makeRequestURL(key, ['httpOrigin'], params))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+      });
+  }, 'sec-fetch-site - Not sent to non-trustworthy same-origin destination');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(t, makeRequestURL(key, ['httpSameSite'], params))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+      });
+  }, 'sec-fetch-site - Not sent to non-trustworthy same-site destination');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(t, makeRequestURL(key, ['httpCrossSite'], params))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+      });
+  }, 'sec-fetch-site - Not sent to non-trustworthy cross-site destination');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(t, makeRequestURL(key, ['httpOrigin'], params))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-mode');
+      });
+  }, 'sec-fetch-mode - Not sent to non-trustworthy same-origin destination');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(t, makeRequestURL(key, ['httpSameSite'], params))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-mode');
+      });
+  }, 'sec-fetch-mode - Not sent to non-trustworthy same-site destination');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(t, makeRequestURL(key, ['httpCrossSite'], params))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-mode');
+      });
+  }, 'sec-fetch-mode - Not sent to non-trustworthy cross-site destination');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(t, makeRequestURL(key, ['httpOrigin'], params))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-dest');
+      });
+  }, 'sec-fetch-dest - Not sent to non-trustworthy same-origin destination');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(t, makeRequestURL(key, ['httpSameSite'], params))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-dest');
+      });
+  }, 'sec-fetch-dest - Not sent to non-trustworthy same-site destination');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(t, makeRequestURL(key, ['httpCrossSite'], params))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-dest');
+      });
+  }, 'sec-fetch-dest - Not sent to non-trustworthy cross-site destination');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(t, makeRequestURL(key, ['httpOrigin'], params))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+      });
+  }, 'sec-fetch-user - Not sent to non-trustworthy same-origin destination');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(t, makeRequestURL(key, ['httpSameSite'], params))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+      });
+  }, 'sec-fetch-user - Not sent to non-trustworthy same-site destination');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(t, makeRequestURL(key, ['httpCrossSite'], params))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+      });
+  }, 'sec-fetch-user - Not sent to non-trustworthy cross-site destination');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(t, makeRequestURL(key, ['httpsOrigin', 'httpOrigin'], params))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+      });
+  }, 'sec-fetch-site - HTTPS downgrade (header not sent)');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(t, makeRequestURL(key, ['httpOrigin', 'httpsOrigin'], params))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+      });
+  }, 'sec-fetch-site - HTTPS upgrade');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(t, makeRequestURL(key, ['httpsOrigin', 'httpOrigin', 'httpsOrigin'], params))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+      });
+  }, 'sec-fetch-site - HTTPS downgrade-upgrade');
+  </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/fetch/metadata/generated/element-frame.https.sub.html b/test/wpt/tests/fetch/metadata/generated/element-frame.https.sub.html
new file mode 100644
index 00000000000..17504ff5635
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/generated/element-frame.https.sub.html
@@ -0,0 +1,309 @@
+<!DOCTYPE html>
+<!--
+This test was procedurally generated. Please do not modify it directly.
+Sources:
+- fetch/metadata/tools/fetch-metadata.conf.yml
+- fetch/metadata/tools/templates/element-frame.sub.html
+-->
+<html lang="en">
+  <meta charset="utf-8">
+  <title>HTTP headers on request for HTML "frame" element source</title>
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  <script src="/resources/testdriver.js"></script>
+  <script src="/resources/testdriver-vendor.js"></script>
+  <script src="/fetch/metadata/resources/helper.sub.js"></script>
+  <body>
+  <script>
+  'use strict';
+
+  function induceRequest(url, test, userActivated) {
+    const frame = document.createElement('frame');
+
+    const setSrc = () => frame.setAttribute('src', url);
+
+    document.body.appendChild(frame);
+    test.add_cleanup(() => frame.remove());
+
+    return new Promise((resolve) => {
+       if (userActivated) {
+         test_driver.bless('enable user activation', setSrc);
+       } else {
+         setSrc();
+       }
+
+        frame.onload = frame.onerror = resolve;
+      });
+  }
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsOrigin'], {mime: 'text/html'}),
+        t,
+        false
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-origin']);
+        });
+  }, 'sec-fetch-site - Same origin');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsCrossSite'], {mime: 'text/html'}),
+        t,
+        false
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Cross-site');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsSameSite'], {mime: 'text/html'}),
+        t,
+        false
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - Same site');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsOrigin', 'httpsCrossSite', 'httpsOrigin'], {mime: 'text/html'}),
+        t,
+        false
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Same-Origin -> Cross-Site -> Same-Origin redirect');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsOrigin', 'httpsSameSite', 'httpsOrigin'], {mime: 'text/html'}),
+        t,
+        false
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - Same-Origin -> Same-Site -> Same-Origin redirect');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsCrossSite', 'httpsOrigin'], {mime: 'text/html'}),
+        t,
+        false
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Cross-Site -> Same Origin');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsCrossSite', 'httpsSameSite'], {mime: 'text/html'}),
+        t,
+        false
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Cross-Site -> Same-Site');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsCrossSite', 'httpsCrossSite'], {mime: 'text/html'}),
+        t,
+        false
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Cross-Site -> Cross-Site');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsOrigin', 'httpsOrigin'], {mime: 'text/html'}),
+        t,
+        false
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-origin']);
+        });
+  }, 'sec-fetch-site - Same-Origin -> Same Origin');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsOrigin', 'httpsSameSite'], {mime: 'text/html'}),
+        t,
+        false
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - Same-Origin -> Same-Site');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsOrigin', 'httpsCrossSite'], {mime: 'text/html'}),
+        t,
+        false
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Same-Origin -> Cross-Site');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsSameSite', 'httpsOrigin'], {mime: 'text/html'}),
+        t,
+        false
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - Same-Site -> Same Origin');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsSameSite', 'httpsSameSite'], {mime: 'text/html'}),
+        t,
+        false
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - Same-Site -> Same-Site');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsSameSite', 'httpsCrossSite'], {mime: 'text/html'}),
+        t,
+        false
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Same-Site -> Cross-Site');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, [], {mime: 'text/html'}),
+        t,
+        false
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-mode');
+          assert_array_equals(headers['sec-fetch-mode'], ['navigate']);
+        });
+  }, 'sec-fetch-mode');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, [], {mime: 'text/html'}),
+        t,
+        false
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-dest');
+          assert_array_equals(headers['sec-fetch-dest'], ['frame']);
+        });
+  }, 'sec-fetch-dest');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, [], {mime: 'text/html'}),
+        t,
+        false
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, [], {mime: 'text/html'}),
+        t,
+        true
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-user');
+          assert_array_equals(headers['sec-fetch-user'], ['?1']);
+        });
+  }, 'sec-fetch-user with user activation');
+  </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/fetch/metadata/generated/element-frame.sub.html b/test/wpt/tests/fetch/metadata/generated/element-frame.sub.html
new file mode 100644
index 00000000000..2d9a7ec97d7
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/generated/element-frame.sub.html
@@ -0,0 +1,250 @@
+<!DOCTYPE html>
+<!--
+This test was procedurally generated. Please do not modify it directly.
+Sources:
+- fetch/metadata/tools/fetch-metadata.conf.yml
+- fetch/metadata/tools/templates/element-frame.sub.html
+-->
+<html lang="en">
+  <meta charset="utf-8">
+  <title>HTTP headers on request for HTML "frame" element source</title>
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  <script src="/fetch/metadata/resources/helper.sub.js"></script>
+  <body>
+  <script>
+  'use strict';
+
+  function induceRequest(url, test, userActivated) {
+    const frame = document.createElement('frame');
+
+    const setSrc = () => frame.setAttribute('src', url);
+
+    document.body.appendChild(frame);
+    test.add_cleanup(() => frame.remove());
+
+    return new Promise((resolve) => {
+       if (userActivated) {
+         test_driver.bless('enable user activation', setSrc);
+       } else {
+         setSrc();
+       }
+
+        frame.onload = frame.onerror = resolve;
+      });
+  }
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpOrigin'], {mime: 'text/html'}),
+        t,
+        false
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        });
+  }, 'sec-fetch-site - Not sent to non-trustworthy same-origin destination');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpSameSite'], {mime: 'text/html'}),
+        t,
+        false
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        });
+  }, 'sec-fetch-site - Not sent to non-trustworthy same-site destination');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpCrossSite'], {mime: 'text/html'}),
+        t,
+        false
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        });
+  }, 'sec-fetch-site - Not sent to non-trustworthy cross-site destination');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpOrigin'], {mime: 'text/html'}),
+        t,
+        false
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-mode');
+        });
+  }, 'sec-fetch-mode - Not sent to non-trustworthy same-origin destination');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpSameSite'], {mime: 'text/html'}),
+        t,
+        false
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-mode');
+        });
+  }, 'sec-fetch-mode - Not sent to non-trustworthy same-site destination');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpCrossSite'], {mime: 'text/html'}),
+        t,
+        false
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-mode');
+        });
+  }, 'sec-fetch-mode - Not sent to non-trustworthy cross-site destination');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpOrigin'], {mime: 'text/html'}),
+        t,
+        false
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-dest');
+        });
+  }, 'sec-fetch-dest - Not sent to non-trustworthy same-origin destination');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpSameSite'], {mime: 'text/html'}),
+        t,
+        false
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-dest');
+        });
+  }, 'sec-fetch-dest - Not sent to non-trustworthy same-site destination');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpCrossSite'], {mime: 'text/html'}),
+        t,
+        false
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-dest');
+        });
+  }, 'sec-fetch-dest - Not sent to non-trustworthy cross-site destination');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpOrigin'], {mime: 'text/html'}),
+        t,
+        false
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user - Not sent to non-trustworthy same-origin destination');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpSameSite'], {mime: 'text/html'}),
+        t,
+        false
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user - Not sent to non-trustworthy same-site destination');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpCrossSite'], {mime: 'text/html'}),
+        t,
+        false
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user - Not sent to non-trustworthy cross-site destination');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsOrigin', 'httpOrigin'], {mime: 'text/html'}),
+        t,
+        false
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        });
+  }, 'sec-fetch-site - HTTPS downgrade (header not sent)');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpOrigin', 'httpsOrigin'], {mime: 'text/html'}),
+        t,
+        false
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - HTTPS upgrade');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsOrigin', 'httpOrigin', 'httpsOrigin'], {mime: 'text/html'}),
+        t,
+        false
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - HTTPS downgrade-upgrade');
+  </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/fetch/metadata/generated/element-iframe.https.sub.html b/test/wpt/tests/fetch/metadata/generated/element-iframe.https.sub.html
new file mode 100644
index 00000000000..fba1c8b9e02
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/generated/element-iframe.https.sub.html
@@ -0,0 +1,309 @@
+<!DOCTYPE html>
+<!--
+This test was procedurally generated. Please do not modify it directly.
+Sources:
+- fetch/metadata/tools/fetch-metadata.conf.yml
+- fetch/metadata/tools/templates/element-iframe.sub.html
+-->
+<html lang="en">
+  <meta charset="utf-8">
+  <title>HTTP headers on request for HTML "frame" element source</title>
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  <script src="/resources/testdriver.js"></script>
+  <script src="/resources/testdriver-vendor.js"></script>
+  <script src="/fetch/metadata/resources/helper.sub.js"></script>
+  <body>
+  <script>
+  'use strict';
+
+  function induceRequest(url, test, userActivated) {
+    const iframe = document.createElement('iframe');
+
+    const setSrc = () => iframe.setAttribute('src', url);
+
+    document.body.appendChild(iframe);
+    test.add_cleanup(() => iframe.remove());
+
+    return new Promise((resolve) => {
+       if (userActivated) {
+         test_driver.bless('enable user activation', setSrc);
+       } else {
+         setSrc();
+       }
+
+        iframe.onload = iframe.onerror = resolve;
+      });
+  }
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsOrigin'], {mime: 'text/html'}),
+        t,
+        false
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-origin']);
+        });
+  }, 'sec-fetch-site - Same origin');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsCrossSite'], {mime: 'text/html'}),
+        t,
+        false
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Cross-site');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsSameSite'], {mime: 'text/html'}),
+        t,
+        false
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - Same site');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsOrigin', 'httpsCrossSite', 'httpsOrigin'], {mime: 'text/html'}),
+        t,
+        false
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Same-Origin -> Cross-Site -> Same-Origin redirect');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsOrigin', 'httpsSameSite', 'httpsOrigin'], {mime: 'text/html'}),
+        t,
+        false
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - Same-Origin -> Same-Site -> Same-Origin redirect');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsCrossSite', 'httpsOrigin'], {mime: 'text/html'}),
+        t,
+        false
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Cross-Site -> Same Origin');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsCrossSite', 'httpsSameSite'], {mime: 'text/html'}),
+        t,
+        false
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Cross-Site -> Same-Site');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsCrossSite', 'httpsCrossSite'], {mime: 'text/html'}),
+        t,
+        false
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Cross-Site -> Cross-Site');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsOrigin', 'httpsOrigin'], {mime: 'text/html'}),
+        t,
+        false
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-origin']);
+        });
+  }, 'sec-fetch-site - Same-Origin -> Same Origin');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsOrigin', 'httpsSameSite'], {mime: 'text/html'}),
+        t,
+        false
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - Same-Origin -> Same-Site');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsOrigin', 'httpsCrossSite'], {mime: 'text/html'}),
+        t,
+        false
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Same-Origin -> Cross-Site');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsSameSite', 'httpsOrigin'], {mime: 'text/html'}),
+        t,
+        false
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - Same-Site -> Same Origin');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsSameSite', 'httpsSameSite'], {mime: 'text/html'}),
+        t,
+        false
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - Same-Site -> Same-Site');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsSameSite', 'httpsCrossSite'], {mime: 'text/html'}),
+        t,
+        false
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Same-Site -> Cross-Site');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, [], {mime: 'text/html'}),
+        t,
+        false
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-mode');
+          assert_array_equals(headers['sec-fetch-mode'], ['navigate']);
+        });
+  }, 'sec-fetch-mode');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, [], {mime: 'text/html'}),
+        t,
+        false
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-dest');
+          assert_array_equals(headers['sec-fetch-dest'], ['iframe']);
+        });
+  }, 'sec-fetch-dest');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, [], {mime: 'text/html'}),
+        t,
+        false
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, [], {mime: 'text/html'}),
+        t,
+        true
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-user');
+          assert_array_equals(headers['sec-fetch-user'], ['?1']);
+        });
+  }, 'sec-fetch-user with user activation');
+  </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/fetch/metadata/generated/element-iframe.sub.html b/test/wpt/tests/fetch/metadata/generated/element-iframe.sub.html
new file mode 100644
index 00000000000..6f71cc0d254
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/generated/element-iframe.sub.html
@@ -0,0 +1,250 @@
+<!DOCTYPE html>
+<!--
+This test was procedurally generated. Please do not modify it directly.
+Sources:
+- fetch/metadata/tools/fetch-metadata.conf.yml
+- fetch/metadata/tools/templates/element-iframe.sub.html
+-->
+<html lang="en">
+  <meta charset="utf-8">
+  <title>HTTP headers on request for HTML "frame" element source</title>
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  <script src="/fetch/metadata/resources/helper.sub.js"></script>
+  <body>
+  <script>
+  'use strict';
+
+  function induceRequest(url, test, userActivated) {
+    const iframe = document.createElement('iframe');
+
+    const setSrc = () => iframe.setAttribute('src', url);
+
+    document.body.appendChild(iframe);
+    test.add_cleanup(() => iframe.remove());
+
+    return new Promise((resolve) => {
+       if (userActivated) {
+         test_driver.bless('enable user activation', setSrc);
+       } else {
+         setSrc();
+       }
+
+        iframe.onload = iframe.onerror = resolve;
+      });
+  }
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpOrigin'], {mime: 'text/html'}),
+        t,
+        false
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        });
+  }, 'sec-fetch-site - Not sent to non-trustworthy same-origin destination');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpSameSite'], {mime: 'text/html'}),
+        t,
+        false
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        });
+  }, 'sec-fetch-site - Not sent to non-trustworthy same-site destination');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpCrossSite'], {mime: 'text/html'}),
+        t,
+        false
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        });
+  }, 'sec-fetch-site - Not sent to non-trustworthy cross-site destination');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpOrigin'], {mime: 'text/html'}),
+        t,
+        false
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-mode');
+        });
+  }, 'sec-fetch-mode - Not sent to non-trustworthy same-origin destination');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpSameSite'], {mime: 'text/html'}),
+        t,
+        false
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-mode');
+        });
+  }, 'sec-fetch-mode - Not sent to non-trustworthy same-site destination');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpCrossSite'], {mime: 'text/html'}),
+        t,
+        false
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-mode');
+        });
+  }, 'sec-fetch-mode - Not sent to non-trustworthy cross-site destination');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpOrigin'], {mime: 'text/html'}),
+        t,
+        false
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-dest');
+        });
+  }, 'sec-fetch-dest - Not sent to non-trustworthy same-origin destination');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpSameSite'], {mime: 'text/html'}),
+        t,
+        false
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-dest');
+        });
+  }, 'sec-fetch-dest - Not sent to non-trustworthy same-site destination');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpCrossSite'], {mime: 'text/html'}),
+        t,
+        false
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-dest');
+        });
+  }, 'sec-fetch-dest - Not sent to non-trustworthy cross-site destination');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpOrigin'], {mime: 'text/html'}),
+        t,
+        false
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user - Not sent to non-trustworthy same-origin destination');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpSameSite'], {mime: 'text/html'}),
+        t,
+        false
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user - Not sent to non-trustworthy same-site destination');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpCrossSite'], {mime: 'text/html'}),
+        t,
+        false
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user - Not sent to non-trustworthy cross-site destination');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsOrigin', 'httpOrigin'], {mime: 'text/html'}),
+        t,
+        false
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        });
+  }, 'sec-fetch-site - HTTPS downgrade (header not sent)');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpOrigin', 'httpsOrigin'], {mime: 'text/html'}),
+        t,
+        false
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - HTTPS upgrade');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsOrigin', 'httpOrigin', 'httpsOrigin'], {mime: 'text/html'}),
+        t,
+        false
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - HTTPS downgrade-upgrade');
+  </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/fetch/metadata/generated/element-img-environment-change.https.sub.html b/test/wpt/tests/fetch/metadata/generated/element-img-environment-change.https.sub.html
new file mode 100644
index 00000000000..a19aa117c4f
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/generated/element-img-environment-change.https.sub.html
@@ -0,0 +1,357 @@
+<!DOCTYPE html>
+<!--
+This test was procedurally generated. Please do not modify it directly.
+Sources:
+- fetch/metadata/tools/fetch-metadata.conf.yml
+- fetch/metadata/tools/templates/element-img-environment-change.sub.html
+-->
+<html lang="en">
+  <meta charset="utf-8">
+  <title>HTTP headers on image request triggered by change to environment</title>
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  <script src="/fetch/metadata/resources/helper.sub.js"></script>
+  <body>
+  <script>
+  'use strict';
+
+  // The response to the request under test must describe a valid image
+  // resource in order for the `load` event to be fired.
+  const params = {
+    body: `
+      <svg xmlns="http://www.w3.org/2000/svg" width="123" height="123">
+        <rect fill="lime" width="123" height="123"/>
+      </svg>
+    `,
+    mime: 'image/svg+xml'
+  };
+
+  function induceRequest(t, url, attributes) {
+    const iframe = document.createElement('iframe');
+    iframe.style.width = '50px';
+    document.body.appendChild(iframe);
+    t.add_cleanup(() => iframe.remove());
+    iframe.contentDocument.open();
+    iframe.contentDocument.close();
+
+    const image = iframe.contentDocument.createElement('img');
+    for (const [ name, value ] of Object.entries(attributes)) {
+      image.setAttribute(name, value);
+    }
+    iframe.contentDocument.body.appendChild(image);
+
+    image.setAttribute('srcset', `${url} 100w, /media/1x1-green.png 1w`);
+    image.setAttribute('sizes', '(max-width: 100px) 1px, (min-width: 150px) 123px');
+
+    return new Promise((resolve) => {
+        image.onload = image.onerror = resolve;
+      })
+      .then(() => {
+
+        iframe.style.width = '200px';
+
+        return new Promise((resolve) => image.onload = resolve);
+      });
+  }
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        t,
+        makeRequestURL(key, ['httpsOrigin'], params),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-origin']);
+        });
+  }, 'sec-fetch-site - Same origin, no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        t,
+        makeRequestURL(key, ['httpsCrossSite'], params),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Cross-site, no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        t,
+        makeRequestURL(key, ['httpsSameSite'], params),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - Same site, no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        t,
+        makeRequestURL(key, ['httpsOrigin', 'httpsCrossSite', 'httpsOrigin'], params),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Same-Origin -> Cross-Site -> Same-Origin redirect, no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        t,
+        makeRequestURL(key, ['httpsOrigin', 'httpsSameSite', 'httpsOrigin'], params),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - Same-Origin -> Same-Site -> Same-Origin redirect, no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        t,
+        makeRequestURL(key, ['httpsCrossSite', 'httpsOrigin'], params),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Cross-Site -> Same Origin, no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        t,
+        makeRequestURL(key, ['httpsCrossSite', 'httpsSameSite'], params),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Cross-Site -> Same-Site, no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        t,
+        makeRequestURL(key, ['httpsCrossSite', 'httpsCrossSite'], params),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Cross-Site -> Cross-Site, no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        t,
+        makeRequestURL(key, ['httpsOrigin', 'httpsOrigin'], params),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-origin']);
+        });
+  }, 'sec-fetch-site - Same-Origin -> Same Origin, no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        t,
+        makeRequestURL(key, ['httpsOrigin', 'httpsSameSite'], params),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - Same-Origin -> Same-Site, no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        t,
+        makeRequestURL(key, ['httpsOrigin', 'httpsCrossSite'], params),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Same-Origin -> Cross-Site, no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        t,
+        makeRequestURL(key, ['httpsSameSite', 'httpsOrigin'], params),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - Same-Site -> Same Origin, no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        t,
+        makeRequestURL(key, ['httpsSameSite', 'httpsSameSite'], params),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - Same-Site -> Same-Site, no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        t,
+        makeRequestURL(key, ['httpsSameSite', 'httpsCrossSite'], params),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Same-Site -> Cross-Site, no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        t,
+        makeRequestURL(key, [], params),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-mode');
+          assert_array_equals(headers['sec-fetch-mode'], ['no-cors']);
+        });
+  }, 'sec-fetch-mode - no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        t,
+        makeRequestURL(key, [], params),
+        {"crossorigin": ""}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-mode');
+          assert_array_equals(headers['sec-fetch-mode'], ['cors']);
+        });
+  }, 'sec-fetch-mode - attributes: crossorigin');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        t,
+        makeRequestURL(key, [], params),
+        {"crossorigin": "anonymous"}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-mode');
+          assert_array_equals(headers['sec-fetch-mode'], ['cors']);
+        });
+  }, 'sec-fetch-mode - attributes: crossorigin=anonymous');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        t,
+        makeRequestURL(key, [], params),
+        {"crossorigin": "use-credentials"}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-mode');
+          assert_array_equals(headers['sec-fetch-mode'], ['cors']);
+        });
+  }, 'sec-fetch-mode - attributes: crossorigin=use-credentials');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        t,
+        makeRequestURL(key, [], params),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-dest');
+          assert_array_equals(headers['sec-fetch-dest'], ['image']);
+        });
+  }, 'sec-fetch-dest - no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        t,
+        makeRequestURL(key, [], params),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user - no attributes');
+  </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/fetch/metadata/generated/element-img-environment-change.sub.html b/test/wpt/tests/fetch/metadata/generated/element-img-environment-change.sub.html
new file mode 100644
index 00000000000..96658726ba0
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/generated/element-img-environment-change.sub.html
@@ -0,0 +1,270 @@
+<!DOCTYPE html>
+<!--
+This test was procedurally generated. Please do not modify it directly.
+Sources:
+- fetch/metadata/tools/fetch-metadata.conf.yml
+- fetch/metadata/tools/templates/element-img-environment-change.sub.html
+-->
+<html lang="en">
+  <meta charset="utf-8">
+  <title>HTTP headers on image request triggered by change to environment</title>
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  <script src="/fetch/metadata/resources/helper.sub.js"></script>
+  <body>
+  <script>
+  'use strict';
+
+  // The response to the request under test must describe a valid image
+  // resource in order for the `load` event to be fired.
+  const params = {
+    body: `
+      <svg xmlns="http://www.w3.org/2000/svg" width="123" height="123">
+        <rect fill="lime" width="123" height="123"/>
+      </svg>
+    `,
+    mime: 'image/svg+xml'
+  };
+
+  function induceRequest(t, url, attributes) {
+    const iframe = document.createElement('iframe');
+    iframe.style.width = '50px';
+    document.body.appendChild(iframe);
+    t.add_cleanup(() => iframe.remove());
+    iframe.contentDocument.open();
+    iframe.contentDocument.close();
+
+    const image = iframe.contentDocument.createElement('img');
+    for (const [ name, value ] of Object.entries(attributes)) {
+      image.setAttribute(name, value);
+    }
+    iframe.contentDocument.body.appendChild(image);
+
+    image.setAttribute('srcset', `${url} 100w, /media/1x1-green.png 1w`);
+    image.setAttribute('sizes', '(max-width: 100px) 1px, (min-width: 150px) 123px');
+
+    return new Promise((resolve) => {
+        image.onload = image.onerror = resolve;
+      })
+      .then(() => {
+
+        iframe.style.width = '200px';
+
+        return new Promise((resolve) => image.onload = resolve);
+      });
+  }
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        t,
+        makeRequestURL(key, ['httpOrigin'], params),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        });
+  }, 'sec-fetch-site - Not sent to non-trustworthy same-origin destination, no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        t,
+        makeRequestURL(key, ['httpSameSite'], params),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        });
+  }, 'sec-fetch-site - Not sent to non-trustworthy same-site destination, no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        t,
+        makeRequestURL(key, ['httpCrossSite'], params),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        });
+  }, 'sec-fetch-site - Not sent to non-trustworthy cross-site destination, no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        t,
+        makeRequestURL(key, ['httpOrigin'], params),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-mode');
+        });
+  }, 'sec-fetch-mode - Not sent to non-trustworthy same-origin destination, no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        t,
+        makeRequestURL(key, ['httpSameSite'], params),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-mode');
+        });
+  }, 'sec-fetch-mode - Not sent to non-trustworthy same-site destination, no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        t,
+        makeRequestURL(key, ['httpCrossSite'], params),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-mode');
+        });
+  }, 'sec-fetch-mode - Not sent to non-trustworthy cross-site destination, no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        t,
+        makeRequestURL(key, ['httpOrigin'], params),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-dest');
+        });
+  }, 'sec-fetch-dest - Not sent to non-trustworthy same-origin destination, no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        t,
+        makeRequestURL(key, ['httpSameSite'], params),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-dest');
+        });
+  }, 'sec-fetch-dest - Not sent to non-trustworthy same-site destination, no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        t,
+        makeRequestURL(key, ['httpCrossSite'], params),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-dest');
+        });
+  }, 'sec-fetch-dest - Not sent to non-trustworthy cross-site destination, no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        t,
+        makeRequestURL(key, ['httpOrigin'], params),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user - Not sent to non-trustworthy same-origin destination, no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        t,
+        makeRequestURL(key, ['httpSameSite'], params),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user - Not sent to non-trustworthy same-site destination, no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        t,
+        makeRequestURL(key, ['httpCrossSite'], params),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user - Not sent to non-trustworthy cross-site destination, no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        t,
+        makeRequestURL(key, ['httpsOrigin', 'httpOrigin'], params),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        });
+  }, 'sec-fetch-site - HTTPS downgrade (header not sent), no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        t,
+        makeRequestURL(key, ['httpOrigin', 'httpsOrigin'], params),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - HTTPS upgrade, no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        t,
+        makeRequestURL(key, ['httpsOrigin', 'httpOrigin', 'httpsOrigin'], params),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - HTTPS downgrade-upgrade, no attributes');
+  </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/fetch/metadata/generated/element-img.https.sub.html b/test/wpt/tests/fetch/metadata/generated/element-img.https.sub.html
new file mode 100644
index 00000000000..51d6e082b0e
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/generated/element-img.https.sub.html
@@ -0,0 +1,645 @@
+<!DOCTYPE html>
+<!--
+This test was procedurally generated. Please do not modify it directly.
+Sources:
+- fetch/metadata/tools/fetch-metadata.conf.yml
+- fetch/metadata/tools/templates/element-img.sub.html
+-->
+<html lang="en">
+  <meta charset="utf-8">
+  <title>HTTP headers on request for HTML "img" element source</title>
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  <script src="/fetch/metadata/resources/helper.sub.js"></script>
+  <body>
+  <script>
+  'use strict';
+
+  function induceRequest(url, sourceAttr, attributes) {
+    const image = document.createElement('img');
+
+    for (const [ name, value ] of Object.entries(attributes)) {
+      image.setAttribute(name, value);
+    }
+
+    return new Promise((resolve) => {
+        image.setAttribute(sourceAttr, url);
+        image.onload = image.onerror = resolve;
+      });
+  }
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsOrigin']),
+        'src',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-origin']);
+        });
+  }, 'sec-fetch-site - src - Same origin, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsOrigin']),
+        'srcset',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-origin']);
+        });
+  }, 'sec-fetch-site - srcset - Same origin, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsCrossSite']),
+        'src',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - src - Cross-site, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsCrossSite']),
+        'srcset',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - srcset - Cross-site, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsSameSite']),
+        'src',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - src - Same site, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsSameSite']),
+        'srcset',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - srcset - Same site, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsOrigin', 'httpsCrossSite', 'httpsOrigin']),
+        'src',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - src - Same-Origin -> Cross-Site -> Same-Origin redirect, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsOrigin', 'httpsCrossSite', 'httpsOrigin']),
+        'srcset',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - srcset - Same-Origin -> Cross-Site -> Same-Origin redirect, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsOrigin', 'httpsSameSite', 'httpsOrigin']),
+        'src',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - src - Same-Origin -> Same-Site -> Same-Origin redirect, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsOrigin', 'httpsSameSite', 'httpsOrigin']),
+        'srcset',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - srcset - Same-Origin -> Same-Site -> Same-Origin redirect, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsCrossSite', 'httpsOrigin']),
+        'src',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - src - Cross-Site -> Same Origin, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsCrossSite', 'httpsOrigin']),
+        'srcset',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - srcset - Cross-Site -> Same Origin, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsCrossSite', 'httpsSameSite']),
+        'src',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - src - Cross-Site -> Same-Site, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsCrossSite', 'httpsSameSite']),
+        'srcset',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - srcset - Cross-Site -> Same-Site, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsCrossSite', 'httpsCrossSite']),
+        'src',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - src - Cross-Site -> Cross-Site, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsCrossSite', 'httpsCrossSite']),
+        'srcset',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - srcset - Cross-Site -> Cross-Site, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsOrigin', 'httpsOrigin']),
+        'src',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-origin']);
+        });
+  }, 'sec-fetch-site - src - Same-Origin -> Same Origin, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsOrigin', 'httpsOrigin']),
+        'srcset',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-origin']);
+        });
+  }, 'sec-fetch-site - srcset - Same-Origin -> Same Origin, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsOrigin', 'httpsSameSite']),
+        'src',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - src - Same-Origin -> Same-Site, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsOrigin', 'httpsSameSite']),
+        'srcset',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - srcset - Same-Origin -> Same-Site, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsOrigin', 'httpsCrossSite']),
+        'src',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - src - Same-Origin -> Cross-Site, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsOrigin', 'httpsCrossSite']),
+        'srcset',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - srcset - Same-Origin -> Cross-Site, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsSameSite', 'httpsOrigin']),
+        'src',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - src - Same-Site -> Same Origin, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsSameSite', 'httpsOrigin']),
+        'srcset',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - srcset - Same-Site -> Same Origin, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsSameSite', 'httpsSameSite']),
+        'src',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - src - Same-Site -> Same-Site, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsSameSite', 'httpsSameSite']),
+        'srcset',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - srcset - Same-Site -> Same-Site, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsSameSite', 'httpsCrossSite']),
+        'src',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - src - Same-Site -> Cross-Site, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsSameSite', 'httpsCrossSite']),
+        'srcset',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - srcset - Same-Site -> Cross-Site, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsOrigin', 'httpOrigin', 'httpsOrigin']),
+        'src',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - src - HTTPS downgrade-upgrade, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, []),
+        'src',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-mode');
+          assert_array_equals(headers['sec-fetch-mode'], ['no-cors']);
+        });
+  }, 'sec-fetch-mode - src - no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, []),
+        'src',
+        {"crossorigin": ""}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-mode');
+          assert_array_equals(headers['sec-fetch-mode'], ['cors']);
+        });
+  }, 'sec-fetch-mode - src - attributes: crossorigin');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, []),
+        'src',
+        {"crossorigin": "anonymous"}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-mode');
+          assert_array_equals(headers['sec-fetch-mode'], ['cors']);
+        });
+  }, 'sec-fetch-mode - src - attributes: crossorigin=anonymous');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, []),
+        'src',
+        {"crossorigin": "use-credentials"}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-mode');
+          assert_array_equals(headers['sec-fetch-mode'], ['cors']);
+        });
+  }, 'sec-fetch-mode - src - attributes: crossorigin=use-credentials');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, []),
+        'srcset',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-mode');
+          assert_array_equals(headers['sec-fetch-mode'], ['no-cors']);
+        });
+  }, 'sec-fetch-mode - srcset - no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, []),
+        'srcset',
+        {"crossorigin": ""}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-mode');
+          assert_array_equals(headers['sec-fetch-mode'], ['cors']);
+        });
+  }, 'sec-fetch-mode - srcset - attributes: crossorigin');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, []),
+        'srcset',
+        {"crossorigin": "anonymous"}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-mode');
+          assert_array_equals(headers['sec-fetch-mode'], ['cors']);
+        });
+  }, 'sec-fetch-mode - srcset - attributes: crossorigin=anonymous');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, []),
+        'srcset',
+        {"crossorigin": "use-credentials"}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-mode');
+          assert_array_equals(headers['sec-fetch-mode'], ['cors']);
+        });
+  }, 'sec-fetch-mode - srcset - attributes: crossorigin=use-credentials');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, []),
+        'src',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-dest');
+          assert_array_equals(headers['sec-fetch-dest'], ['image']);
+        });
+  }, 'sec-fetch-dest - src - no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, []),
+        'srcset',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-dest');
+          assert_array_equals(headers['sec-fetch-dest'], ['image']);
+        });
+  }, 'sec-fetch-dest - srcset - no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, []),
+        'src',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user - src - no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, []),
+        'srcset',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user - srcset - no attributes');
+  </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/fetch/metadata/generated/element-img.sub.html b/test/wpt/tests/fetch/metadata/generated/element-img.sub.html
new file mode 100644
index 00000000000..5a4b152c552
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/generated/element-img.sub.html
@@ -0,0 +1,456 @@
+<!DOCTYPE html>
+<!--
+This test was procedurally generated. Please do not modify it directly.
+Sources:
+- fetch/metadata/tools/fetch-metadata.conf.yml
+- fetch/metadata/tools/templates/element-img.sub.html
+-->
+<html lang="en">
+  <meta charset="utf-8">
+  <title>HTTP headers on request for HTML "img" element source</title>
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  <script src="/fetch/metadata/resources/helper.sub.js"></script>
+  <body>
+  <script>
+  'use strict';
+
+  function induceRequest(url, sourceAttr, attributes) {
+    const image = document.createElement('img');
+
+    for (const [ name, value ] of Object.entries(attributes)) {
+      image.setAttribute(name, value);
+    }
+
+    return new Promise((resolve) => {
+        image.setAttribute(sourceAttr, url);
+        image.onload = image.onerror = resolve;
+      });
+  }
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpOrigin']),
+        'src',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        });
+  }, 'sec-fetch-site - src - Not sent to non-trustworthy same-origin destination, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpOrigin']),
+        'srcset',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        });
+  }, 'sec-fetch-site - srcset - Not sent to non-trustworthy same-origin destination, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpSameSite']),
+        'src',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        });
+  }, 'sec-fetch-site - src - Not sent to non-trustworthy same-site destination, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpSameSite']),
+        'srcset',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        });
+  }, 'sec-fetch-site - srcset - Not sent to non-trustworthy same-site destination, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpCrossSite']),
+        'src',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        });
+  }, 'sec-fetch-site - src - Not sent to non-trustworthy cross-site destination, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpCrossSite']),
+        'srcset',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        });
+  }, 'sec-fetch-site - srcset - Not sent to non-trustworthy cross-site destination, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpOrigin']),
+        'src',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-mode');
+        });
+  }, 'sec-fetch-mode - src - Not sent to non-trustworthy same-origin destination, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpOrigin']),
+        'srcset',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-mode');
+        });
+  }, 'sec-fetch-mode - srcset - Not sent to non-trustworthy same-origin destination, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpSameSite']),
+        'src',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-mode');
+        });
+  }, 'sec-fetch-mode - src - Not sent to non-trustworthy same-site destination, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpSameSite']),
+        'srcset',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-mode');
+        });
+  }, 'sec-fetch-mode - srcset - Not sent to non-trustworthy same-site destination, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpCrossSite']),
+        'src',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-mode');
+        });
+  }, 'sec-fetch-mode - src - Not sent to non-trustworthy cross-site destination, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpCrossSite']),
+        'srcset',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-mode');
+        });
+  }, 'sec-fetch-mode - srcset - Not sent to non-trustworthy cross-site destination, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpOrigin']),
+        'src',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-dest');
+        });
+  }, 'sec-fetch-dest - src - Not sent to non-trustworthy same-origin destination, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpOrigin']),
+        'srcset',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-dest');
+        });
+  }, 'sec-fetch-dest - srcset - Not sent to non-trustworthy same-origin destination, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpSameSite']),
+        'src',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-dest');
+        });
+  }, 'sec-fetch-dest - src - Not sent to non-trustworthy same-site destination, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpSameSite']),
+        'srcset',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-dest');
+        });
+  }, 'sec-fetch-dest - srcset - Not sent to non-trustworthy same-site destination, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpCrossSite']),
+        'src',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-dest');
+        });
+  }, 'sec-fetch-dest - src - Not sent to non-trustworthy cross-site destination, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpCrossSite']),
+        'srcset',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-dest');
+        });
+  }, 'sec-fetch-dest - srcset - Not sent to non-trustworthy cross-site destination, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpOrigin']),
+        'src',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user - src - Not sent to non-trustworthy same-origin destination, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpOrigin']),
+        'srcset',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user - srcset - Not sent to non-trustworthy same-origin destination, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpSameSite']),
+        'src',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user - src - Not sent to non-trustworthy same-site destination, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpSameSite']),
+        'srcset',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user - srcset - Not sent to non-trustworthy same-site destination, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpCrossSite']),
+        'src',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user - src - Not sent to non-trustworthy cross-site destination, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpCrossSite']),
+        'srcset',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user - srcset - Not sent to non-trustworthy cross-site destination, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsOrigin', 'httpOrigin']),
+        'src',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        });
+  }, 'sec-fetch-site - src - HTTPS downgrade (header not sent), no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsOrigin', 'httpOrigin']),
+        'srcset',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        });
+  }, 'sec-fetch-site - srcset - HTTPS downgrade (header not sent), no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpOrigin', 'httpsOrigin']),
+        'src',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - src - HTTPS upgrade, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpOrigin', 'httpsOrigin']),
+        'srcset',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - srcset - HTTPS upgrade, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsOrigin', 'httpOrigin', 'httpsOrigin']),
+        'src',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - src - HTTPS downgrade-upgrade, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsOrigin', 'httpOrigin', 'httpsOrigin']),
+        'srcset',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - srcset - HTTPS downgrade-upgrade, no attributes');
+  </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/fetch/metadata/generated/element-input-image.https.sub.html b/test/wpt/tests/fetch/metadata/generated/element-input-image.https.sub.html
new file mode 100644
index 00000000000..7fa674043e2
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/generated/element-input-image.https.sub.html
@@ -0,0 +1,229 @@
+<!DOCTYPE html>
+<!--
+This test was procedurally generated. Please do not modify it directly.
+Sources:
+- fetch/metadata/tools/fetch-metadata.conf.yml
+- fetch/metadata/tools/templates/element-input-image.sub.html
+-->
+<html lang="en">
+  <meta charset="utf-8">
+  <title>HTTP headers on request for HTML "input" element with type="button"</title>
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  <script src="/fetch/metadata/resources/helper.sub.js"></script>
+  <body>
+  <script>
+  'use strict';
+
+  function induceRequest(url, test) {
+    const input = document.createElement('input');
+    input.setAttribute('type', 'image');
+
+    document.body.appendChild(input);
+    test.add_cleanup(() => input.remove());
+
+    return new Promise((resolve) => {
+        input.onload = input.onerror = resolve;
+        input.setAttribute('src', url);
+      });
+  }
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(makeRequestURL(key, ['httpsOrigin']), t)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-origin']);
+        });
+  }, 'sec-fetch-site - Same origin, no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(makeRequestURL(key, ['httpsCrossSite']), t)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Cross-site, no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(makeRequestURL(key, ['httpsSameSite']), t)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - Same site, no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(makeRequestURL(key, ['httpsOrigin', 'httpsCrossSite', 'httpsOrigin']), t)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Same-Origin -> Cross-Site -> Same-Origin redirect, no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(makeRequestURL(key, ['httpsOrigin', 'httpsSameSite', 'httpsOrigin']), t)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - Same-Origin -> Same-Site -> Same-Origin redirect, no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(makeRequestURL(key, ['httpsCrossSite', 'httpsOrigin']), t)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Cross-Site -> Same Origin, no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(makeRequestURL(key, ['httpsCrossSite', 'httpsSameSite']), t)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Cross-Site -> Same-Site, no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(makeRequestURL(key, ['httpsCrossSite', 'httpsCrossSite']), t)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Cross-Site -> Cross-Site, no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(makeRequestURL(key, ['httpsOrigin', 'httpsOrigin']), t)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-origin']);
+        });
+  }, 'sec-fetch-site - Same-Origin -> Same Origin, no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(makeRequestURL(key, ['httpsOrigin', 'httpsSameSite']), t)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - Same-Origin -> Same-Site, no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(makeRequestURL(key, ['httpsOrigin', 'httpsCrossSite']), t)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Same-Origin -> Cross-Site, no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(makeRequestURL(key, ['httpsSameSite', 'httpsOrigin']), t)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - Same-Site -> Same Origin, no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(makeRequestURL(key, ['httpsSameSite', 'httpsSameSite']), t)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - Same-Site -> Same-Site, no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(makeRequestURL(key, ['httpsSameSite', 'httpsCrossSite']), t)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Same-Site -> Cross-Site, no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(makeRequestURL(key, ['httpsOrigin', 'httpOrigin', 'httpsOrigin']), t)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - HTTPS downgrade-upgrade, no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(makeRequestURL(key, []), t)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-mode');
+          assert_array_equals(headers['sec-fetch-mode'], ['no-cors']);
+        });
+  }, 'sec-fetch-mode - no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(makeRequestURL(key, []), t)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-dest');
+          assert_array_equals(headers['sec-fetch-dest'], ['image']);
+        });
+  }, 'sec-fetch-dest - no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(makeRequestURL(key, []), t)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user - no attributes');
+  </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/fetch/metadata/generated/element-input-image.sub.html b/test/wpt/tests/fetch/metadata/generated/element-input-image.sub.html
new file mode 100644
index 00000000000..fb2a146b199
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/generated/element-input-image.sub.html
@@ -0,0 +1,184 @@
+<!DOCTYPE html>
+<!--
+This test was procedurally generated. Please do not modify it directly.
+Sources:
+- fetch/metadata/tools/fetch-metadata.conf.yml
+- fetch/metadata/tools/templates/element-input-image.sub.html
+-->
+<html lang="en">
+  <meta charset="utf-8">
+  <title>HTTP headers on request for HTML "input" element with type="button"</title>
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  <script src="/fetch/metadata/resources/helper.sub.js"></script>
+  <body>
+  <script>
+  'use strict';
+
+  function induceRequest(url, test) {
+    const input = document.createElement('input');
+    input.setAttribute('type', 'image');
+
+    document.body.appendChild(input);
+    test.add_cleanup(() => input.remove());
+
+    return new Promise((resolve) => {
+        input.onload = input.onerror = resolve;
+        input.setAttribute('src', url);
+      });
+  }
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(makeRequestURL(key, ['httpOrigin']), t)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        });
+  }, 'sec-fetch-site - Not sent to non-trustworthy same-origin destination, no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(makeRequestURL(key, ['httpSameSite']), t)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        });
+  }, 'sec-fetch-site - Not sent to non-trustworthy same-site destination, no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(makeRequestURL(key, ['httpCrossSite']), t)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        });
+  }, 'sec-fetch-site - Not sent to non-trustworthy cross-site destination, no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(makeRequestURL(key, ['httpOrigin']), t)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-mode');
+        });
+  }, 'sec-fetch-mode - Not sent to non-trustworthy same-origin destination, no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(makeRequestURL(key, ['httpSameSite']), t)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-mode');
+        });
+  }, 'sec-fetch-mode - Not sent to non-trustworthy same-site destination, no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(makeRequestURL(key, ['httpCrossSite']), t)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-mode');
+        });
+  }, 'sec-fetch-mode - Not sent to non-trustworthy cross-site destination, no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(makeRequestURL(key, ['httpOrigin']), t)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-dest');
+        });
+  }, 'sec-fetch-dest - Not sent to non-trustworthy same-origin destination, no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(makeRequestURL(key, ['httpSameSite']), t)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-dest');
+        });
+  }, 'sec-fetch-dest - Not sent to non-trustworthy same-site destination, no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(makeRequestURL(key, ['httpCrossSite']), t)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-dest');
+        });
+  }, 'sec-fetch-dest - Not sent to non-trustworthy cross-site destination, no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(makeRequestURL(key, ['httpOrigin']), t)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user - Not sent to non-trustworthy same-origin destination, no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(makeRequestURL(key, ['httpSameSite']), t)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user - Not sent to non-trustworthy same-site destination, no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(makeRequestURL(key, ['httpCrossSite']), t)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user - Not sent to non-trustworthy cross-site destination, no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(makeRequestURL(key, ['httpsOrigin', 'httpOrigin']), t)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        });
+  }, 'sec-fetch-site - HTTPS downgrade (header not sent), no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(makeRequestURL(key, ['httpOrigin', 'httpsOrigin']), t)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - HTTPS upgrade, no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(makeRequestURL(key, ['httpsOrigin', 'httpOrigin', 'httpsOrigin']), t)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - HTTPS downgrade-upgrade, no attributes');
+  </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/fetch/metadata/generated/element-link-icon.https.sub.html b/test/wpt/tests/fetch/metadata/generated/element-link-icon.https.sub.html
new file mode 100644
index 00000000000..b2449607553
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/generated/element-link-icon.https.sub.html
@@ -0,0 +1,371 @@
+<!DOCTYPE html>
+<!--
+This test was procedurally generated. Please do not modify it directly.
+Sources:
+- fetch/metadata/tools/fetch-metadata.conf.yml
+- fetch/metadata/tools/templates/element-link-icon.sub.html
+-->
+<html lang="en">
+  <meta charset="utf-8">
+  <meta name="timeout" content="long">
+  <title>HTTP headers on request for HTML "link" element with rel="icon"</title>
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  <script src="/fetch/metadata/resources/helper.sub.js"></script>
+  <body>
+  <script>
+  'use strict';
+
+  const params = {
+    body: `
+      <svg xmlns="http://www.w3.org/2000/svg" width="123" height="123">
+        <rect fill="lime" width="123" height="123"/>
+      </svg>
+    `,
+    mime: 'image/svg+xml'
+  };
+
+  /**
+   * The `link` element supports a `load` event. That event would reliably
+   * indicate that the browser had received the request. Multiple major
+   * browsers do not implement the event, however, so in order to promote the
+   * visibility of this test, a less efficient polling-based detection
+   * mechanism is used.
+   *
+   * https://bugzilla.mozilla.org/show_bug.cgi?id=1638188
+   * https://bugs.chromium.org/p/chromium/issues/detail?id=1083034
+   */
+  function induceRequest(t, url, attributes) {
+    const link = document.createElement('link');
+    link.setAttribute('rel', 'icon');
+    link.setAttribute('href', url);
+
+    for (const [ name, value ] of Object.entries(attributes)) {
+      link.setAttribute(name, value);
+    }
+
+    document.head.appendChild(link);
+    t.add_cleanup(() => link.remove());
+  }
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      t,
+      makeRequestURL(key, ['httpsOrigin'], params),
+      {}
+    );
+
+    return retrieve(key, {poll:true})
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-origin']);
+      });
+  }, 'sec-fetch-site - Same origin no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      t,
+      makeRequestURL(key, ['httpsCrossSite'], params),
+      {}
+    );
+
+    return retrieve(key, {poll:true})
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+      });
+  }, 'sec-fetch-site - Cross-site no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      t,
+      makeRequestURL(key, ['httpsSameSite'], params),
+      {}
+    );
+
+    return retrieve(key, {poll:true})
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+      });
+  }, 'sec-fetch-site - Same site no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      t,
+      makeRequestURL(key, ['httpsOrigin', 'httpsCrossSite', 'httpsOrigin'], params),
+      {}
+    );
+
+    return retrieve(key, {poll:true})
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+      });
+  }, 'sec-fetch-site - Same-Origin -> Cross-Site -> Same-Origin redirect no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      t,
+      makeRequestURL(key, ['httpsOrigin', 'httpsSameSite', 'httpsOrigin'], params),
+      {}
+    );
+
+    return retrieve(key, {poll:true})
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+      });
+  }, 'sec-fetch-site - Same-Origin -> Same-Site -> Same-Origin redirect no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      t,
+      makeRequestURL(key, ['httpsCrossSite', 'httpsOrigin'], params),
+      {}
+    );
+
+    return retrieve(key, {poll:true})
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+      });
+  }, 'sec-fetch-site - Cross-Site -> Same Origin no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      t,
+      makeRequestURL(key, ['httpsCrossSite', 'httpsSameSite'], params),
+      {}
+    );
+
+    return retrieve(key, {poll:true})
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+      });
+  }, 'sec-fetch-site - Cross-Site -> Same-Site no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      t,
+      makeRequestURL(key, ['httpsCrossSite', 'httpsCrossSite'], params),
+      {}
+    );
+
+    return retrieve(key, {poll:true})
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+      });
+  }, 'sec-fetch-site - Cross-Site -> Cross-Site no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      t,
+      makeRequestURL(key, ['httpsOrigin', 'httpsOrigin'], params),
+      {}
+    );
+
+    return retrieve(key, {poll:true})
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-origin']);
+      });
+  }, 'sec-fetch-site - Same-Origin -> Same Origin no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      t,
+      makeRequestURL(key, ['httpsOrigin', 'httpsSameSite'], params),
+      {}
+    );
+
+    return retrieve(key, {poll:true})
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+      });
+  }, 'sec-fetch-site - Same-Origin -> Same-Site no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      t,
+      makeRequestURL(key, ['httpsOrigin', 'httpsCrossSite'], params),
+      {}
+    );
+
+    return retrieve(key, {poll:true})
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+      });
+  }, 'sec-fetch-site - Same-Origin -> Cross-Site no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      t,
+      makeRequestURL(key, ['httpsSameSite', 'httpsOrigin'], params),
+      {}
+    );
+
+    return retrieve(key, {poll:true})
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+      });
+  }, 'sec-fetch-site - Same-Site -> Same Origin no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      t,
+      makeRequestURL(key, ['httpsSameSite', 'httpsSameSite'], params),
+      {}
+    );
+
+    return retrieve(key, {poll:true})
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+      });
+  }, 'sec-fetch-site - Same-Site -> Same-Site no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      t,
+      makeRequestURL(key, ['httpsSameSite', 'httpsCrossSite'], params),
+      {}
+    );
+
+    return retrieve(key, {poll:true})
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+      });
+  }, 'sec-fetch-site - Same-Site -> Cross-Site no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      t,
+      makeRequestURL(key, [], params),
+      {}
+    );
+
+    return retrieve(key, {poll:true})
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-mode');
+          assert_array_equals(headers['sec-fetch-mode'], ['no-cors']);
+      });
+  }, 'sec-fetch-mode no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      t,
+      makeRequestURL(key, [], params),
+      {"crossorigin": ""}
+    );
+
+    return retrieve(key, {poll:true})
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-mode');
+          assert_array_equals(headers['sec-fetch-mode'], ['cors']);
+      });
+  }, 'sec-fetch-mode attributes: crossorigin');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      t,
+      makeRequestURL(key, [], params),
+      {"crossorigin": "anonymous"}
+    );
+
+    return retrieve(key, {poll:true})
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-mode');
+          assert_array_equals(headers['sec-fetch-mode'], ['cors']);
+      });
+  }, 'sec-fetch-mode attributes: crossorigin=anonymous');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      t,
+      makeRequestURL(key, [], params),
+      {"crossorigin": "use-credentials"}
+    );
+
+    return retrieve(key, {poll:true})
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-mode');
+          assert_array_equals(headers['sec-fetch-mode'], ['cors']);
+      });
+  }, 'sec-fetch-mode attributes: crossorigin=use-credentials');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      t,
+      makeRequestURL(key, [], params),
+      {}
+    );
+
+    return retrieve(key, {poll:true})
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-dest');
+          assert_array_equals(headers['sec-fetch-dest'], ['empty']);
+      });
+  }, 'sec-fetch-dest no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      t,
+      makeRequestURL(key, [], params),
+      {}
+    );
+
+    return retrieve(key, {poll:true})
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+      });
+  }, 'sec-fetch-user no attributes');
+  </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/fetch/metadata/generated/element-link-icon.sub.html b/test/wpt/tests/fetch/metadata/generated/element-link-icon.sub.html
new file mode 100644
index 00000000000..e9226c190a5
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/generated/element-link-icon.sub.html
@@ -0,0 +1,279 @@
+<!DOCTYPE html>
+<!--
+This test was procedurally generated. Please do not modify it directly.
+Sources:
+- fetch/metadata/tools/fetch-metadata.conf.yml
+- fetch/metadata/tools/templates/element-link-icon.sub.html
+-->
+<html lang="en">
+  <meta charset="utf-8">
+  <meta name="timeout" content="long">
+  <title>HTTP headers on request for HTML "link" element with rel="icon"</title>
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  <script src="/fetch/metadata/resources/helper.sub.js"></script>
+  <body>
+  <script>
+  'use strict';
+
+  const params = {
+    body: `
+      <svg xmlns="http://www.w3.org/2000/svg" width="123" height="123">
+        <rect fill="lime" width="123" height="123"/>
+      </svg>
+    `,
+    mime: 'image/svg+xml'
+  };
+
+  /**
+   * The `link` element supports a `load` event. That event would reliably
+   * indicate that the browser had received the request. Multiple major
+   * browsers do not implement the event, however, so in order to promote the
+   * visibility of this test, a less efficient polling-based detection
+   * mechanism is used.
+   *
+   * https://bugzilla.mozilla.org/show_bug.cgi?id=1638188
+   * https://bugs.chromium.org/p/chromium/issues/detail?id=1083034
+   */
+  function induceRequest(t, url, attributes) {
+    const link = document.createElement('link');
+    link.setAttribute('rel', 'icon');
+    link.setAttribute('href', url);
+
+    for (const [ name, value ] of Object.entries(attributes)) {
+      link.setAttribute(name, value);
+    }
+
+    document.head.appendChild(link);
+    t.add_cleanup(() => link.remove());
+  }
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      t,
+      makeRequestURL(key, ['httpOrigin'], params),
+      {}
+    );
+
+    return retrieve(key, {poll:true})
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+      });
+  }, 'sec-fetch-site - Not sent to non-trustworthy same-origin destination no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      t,
+      makeRequestURL(key, ['httpSameSite'], params),
+      {}
+    );
+
+    return retrieve(key, {poll:true})
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+      });
+  }, 'sec-fetch-site - Not sent to non-trustworthy same-site destination no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      t,
+      makeRequestURL(key, ['httpCrossSite'], params),
+      {}
+    );
+
+    return retrieve(key, {poll:true})
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+      });
+  }, 'sec-fetch-site - Not sent to non-trustworthy cross-site destination no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      t,
+      makeRequestURL(key, ['httpOrigin'], params),
+      {}
+    );
+
+    return retrieve(key, {poll:true})
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-mode');
+      });
+  }, 'sec-fetch-mode - Not sent to non-trustworthy same-origin destination no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      t,
+      makeRequestURL(key, ['httpSameSite'], params),
+      {}
+    );
+
+    return retrieve(key, {poll:true})
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-mode');
+      });
+  }, 'sec-fetch-mode - Not sent to non-trustworthy same-site destination no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      t,
+      makeRequestURL(key, ['httpCrossSite'], params),
+      {}
+    );
+
+    return retrieve(key, {poll:true})
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-mode');
+      });
+  }, 'sec-fetch-mode - Not sent to non-trustworthy cross-site destination no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      t,
+      makeRequestURL(key, ['httpOrigin'], params),
+      {}
+    );
+
+    return retrieve(key, {poll:true})
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-dest');
+      });
+  }, 'sec-fetch-dest - Not sent to non-trustworthy same-origin destination no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      t,
+      makeRequestURL(key, ['httpSameSite'], params),
+      {}
+    );
+
+    return retrieve(key, {poll:true})
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-dest');
+      });
+  }, 'sec-fetch-dest - Not sent to non-trustworthy same-site destination no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      t,
+      makeRequestURL(key, ['httpCrossSite'], params),
+      {}
+    );
+
+    return retrieve(key, {poll:true})
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-dest');
+      });
+  }, 'sec-fetch-dest - Not sent to non-trustworthy cross-site destination no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      t,
+      makeRequestURL(key, ['httpOrigin'], params),
+      {}
+    );
+
+    return retrieve(key, {poll:true})
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+      });
+  }, 'sec-fetch-user - Not sent to non-trustworthy same-origin destination no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      t,
+      makeRequestURL(key, ['httpSameSite'], params),
+      {}
+    );
+
+    return retrieve(key, {poll:true})
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+      });
+  }, 'sec-fetch-user - Not sent to non-trustworthy same-site destination no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      t,
+      makeRequestURL(key, ['httpCrossSite'], params),
+      {}
+    );
+
+    return retrieve(key, {poll:true})
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+      });
+  }, 'sec-fetch-user - Not sent to non-trustworthy cross-site destination no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      t,
+      makeRequestURL(key, ['httpsOrigin', 'httpOrigin'], params),
+      {}
+    );
+
+    return retrieve(key, {poll:true})
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+      });
+  }, 'sec-fetch-site - HTTPS downgrade (header not sent) no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      t,
+      makeRequestURL(key, ['httpOrigin', 'httpsOrigin'], params),
+      {}
+    );
+
+    return retrieve(key, {poll:true})
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+      });
+  }, 'sec-fetch-site - HTTPS upgrade no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      t,
+      makeRequestURL(key, ['httpsOrigin', 'httpOrigin', 'httpsOrigin'], params),
+      {}
+    );
+
+    return retrieve(key, {poll:true})
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+      });
+  }, 'sec-fetch-site - HTTPS downgrade-upgrade no attributes');
+  </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/fetch/metadata/generated/element-link-prefetch.https.optional.sub.html b/test/wpt/tests/fetch/metadata/generated/element-link-prefetch.https.optional.sub.html
new file mode 100644
index 00000000000..bdd684a2679
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/generated/element-link-prefetch.https.optional.sub.html
@@ -0,0 +1,559 @@
+<!DOCTYPE html>
+<!--
+This test was procedurally generated. Please do not modify it directly.
+Sources:
+- fetch/metadata/tools/fetch-metadata.conf.yml
+- fetch/metadata/tools/templates/element-link-prefetch.optional.sub.html
+-->
+<html lang="en">
+  <meta charset="utf-8">
+  <meta name="timeout" content="long">
+  <title>HTTP headers on request for HTML "link" element with rel="prefetch"</title>
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  <script src="/fetch/metadata/resources/helper.sub.js"></script>
+  <body>
+  <script>
+  'use strict';
+
+  /**
+   * The `link` element supports a `load` event. That event would reliably
+   * indicate that the browser had received the request. Multiple major
+   * browsers do not implement the event, however, so in order to promote the
+   * visibility of this test, a less efficient polling-based detection
+   * mechanism is used.
+   *
+   * https://bugzilla.mozilla.org/show_bug.cgi?id=1638188
+   * https://bugs.chromium.org/p/chromium/issues/detail?id=1083034
+   */
+  function induceRequest(t, url, attributes) {
+    const link = document.createElement('link');
+    link.setAttribute('rel', 'prefetch');
+    link.setAttribute('href', url);
+
+    for (const [ name, value ] of Object.entries(attributes)) {
+      link.setAttribute(name, value);
+    }
+
+    document.head.appendChild(link);
+    t.add_cleanup(() => link.remove());
+  }
+
+  setup(() => {
+    assert_implements_optional(document.createElement('link').relList.supports('prefetch'));
+  });
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      t,
+      makeRequestURL(key, ['httpsOrigin']),
+      {}
+    );
+
+    return retrieve(key, {poll:true})
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-origin']);
+      });
+  }, 'sec-fetch-site - Same origin no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      t,
+      makeRequestURL(key, ['httpsCrossSite']),
+      {}
+    );
+
+    return retrieve(key, {poll:true})
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+      });
+  }, 'sec-fetch-site - Cross-site no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      t,
+      makeRequestURL(key, ['httpsSameSite']),
+      {}
+    );
+
+    return retrieve(key, {poll:true})
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+      });
+  }, 'sec-fetch-site - Same site no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      t,
+      makeRequestURL(key, ['httpsOrigin', 'httpsCrossSite', 'httpsOrigin']),
+      {}
+    );
+
+    return retrieve(key, {poll:true})
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+      });
+  }, 'sec-fetch-site - Same-Origin -> Cross-Site -> Same-Origin redirect no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      t,
+      makeRequestURL(key, ['httpsOrigin', 'httpsSameSite', 'httpsOrigin']),
+      {}
+    );
+
+    return retrieve(key, {poll:true})
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+      });
+  }, 'sec-fetch-site - Same-Origin -> Same-Site -> Same-Origin redirect no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      t,
+      makeRequestURL(key, ['httpsCrossSite', 'httpsOrigin']),
+      {}
+    );
+
+    return retrieve(key, {poll:true})
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+      });
+  }, 'sec-fetch-site - Cross-Site -> Same Origin no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      t,
+      makeRequestURL(key, ['httpsCrossSite', 'httpsSameSite']),
+      {}
+    );
+
+    return retrieve(key, {poll:true})
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+      });
+  }, 'sec-fetch-site - Cross-Site -> Same-Site no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      t,
+      makeRequestURL(key, ['httpsCrossSite', 'httpsCrossSite']),
+      {}
+    );
+
+    return retrieve(key, {poll:true})
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+      });
+  }, 'sec-fetch-site - Cross-Site -> Cross-Site no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      t,
+      makeRequestURL(key, ['httpsOrigin', 'httpsOrigin']),
+      {}
+    );
+
+    return retrieve(key, {poll:true})
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-origin']);
+      });
+  }, 'sec-fetch-site - Same-Origin -> Same Origin no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      t,
+      makeRequestURL(key, ['httpsOrigin', 'httpsSameSite']),
+      {}
+    );
+
+    return retrieve(key, {poll:true})
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+      });
+  }, 'sec-fetch-site - Same-Origin -> Same-Site no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      t,
+      makeRequestURL(key, ['httpsOrigin', 'httpsCrossSite']),
+      {}
+    );
+
+    return retrieve(key, {poll:true})
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+      });
+  }, 'sec-fetch-site - Same-Origin -> Cross-Site no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      t,
+      makeRequestURL(key, ['httpsSameSite', 'httpsOrigin']),
+      {}
+    );
+
+    return retrieve(key, {poll:true})
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+      });
+  }, 'sec-fetch-site - Same-Site -> Same Origin no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      t,
+      makeRequestURL(key, ['httpsSameSite', 'httpsSameSite']),
+      {}
+    );
+
+    return retrieve(key, {poll:true})
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+      });
+  }, 'sec-fetch-site - Same-Site -> Same-Site no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      t,
+      makeRequestURL(key, ['httpsSameSite', 'httpsCrossSite']),
+      {}
+    );
+
+    return retrieve(key, {poll:true})
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+      });
+  }, 'sec-fetch-site - Same-Site -> Cross-Site no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      t,
+      makeRequestURL(key, []),
+      {}
+    );
+
+    return retrieve(key, {poll:true})
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-mode');
+          assert_array_equals(headers['sec-fetch-mode'], ['no-cors']);
+      });
+  }, 'sec-fetch-mode no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      t,
+      makeRequestURL(key, []),
+      {"crossorigin": ""}
+    );
+
+    return retrieve(key, {poll:true})
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-mode');
+          assert_array_equals(headers['sec-fetch-mode'], ['cors']);
+      });
+  }, 'sec-fetch-mode attributes: crossorigin');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      t,
+      makeRequestURL(key, []),
+      {"crossorigin": "anonymous"}
+    );
+
+    return retrieve(key, {poll:true})
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-mode');
+          assert_array_equals(headers['sec-fetch-mode'], ['cors']);
+      });
+  }, 'sec-fetch-mode attributes: crossorigin=anonymous');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      t,
+      makeRequestURL(key, []),
+      {"crossorigin": "use-credentials"}
+    );
+
+    return retrieve(key, {poll:true})
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-mode');
+          assert_array_equals(headers['sec-fetch-mode'], ['cors']);
+      });
+  }, 'sec-fetch-mode attributes: crossorigin=use-credentials');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      t,
+      makeRequestURL(key, []),
+      {}
+    );
+
+    return retrieve(key, {poll:true})
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-dest');
+          assert_array_equals(headers['sec-fetch-dest'], ['empty']);
+      });
+  }, 'sec-fetch-dest no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      t,
+      makeRequestURL(key, []),
+      {"as": "audio"}
+    );
+
+    return retrieve(key, {poll:true})
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-dest');
+          assert_array_equals(headers['sec-fetch-dest'], ['audio']);
+      });
+  }, 'sec-fetch-dest attributes: as=audio');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      t,
+      makeRequestURL(key, []),
+      {"as": "document"}
+    );
+
+    return retrieve(key, {poll:true})
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-dest');
+          assert_array_equals(headers['sec-fetch-dest'], ['document']);
+      });
+  }, 'sec-fetch-dest attributes: as=document');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      t,
+      makeRequestURL(key, []),
+      {"as": "embed"}
+    );
+
+    return retrieve(key, {poll:true})
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-dest');
+          assert_array_equals(headers['sec-fetch-dest'], ['embed']);
+      });
+  }, 'sec-fetch-dest attributes: as=embed');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      t,
+      makeRequestURL(key, []),
+      {"as": "fetch"}
+    );
+
+    return retrieve(key, {poll:true})
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-dest');
+          assert_array_equals(headers['sec-fetch-dest'], ['fetch']);
+      });
+  }, 'sec-fetch-dest attributes: as=fetch');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      t,
+      makeRequestURL(key, []),
+      {"as": "font"}
+    );
+
+    return retrieve(key, {poll:true})
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-dest');
+          assert_array_equals(headers['sec-fetch-dest'], ['font']);
+      });
+  }, 'sec-fetch-dest attributes: as=font');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      t,
+      makeRequestURL(key, []),
+      {"as": "image"}
+    );
+
+    return retrieve(key, {poll:true})
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-dest');
+          assert_array_equals(headers['sec-fetch-dest'], ['image']);
+      });
+  }, 'sec-fetch-dest attributes: as=image');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      t,
+      makeRequestURL(key, []),
+      {"as": "object"}
+    );
+
+    return retrieve(key, {poll:true})
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-dest');
+          assert_array_equals(headers['sec-fetch-dest'], ['object']);
+      });
+  }, 'sec-fetch-dest attributes: as=object');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      t,
+      makeRequestURL(key, []),
+      {"as": "script"}
+    );
+
+    return retrieve(key, {poll:true})
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-dest');
+          assert_array_equals(headers['sec-fetch-dest'], ['script']);
+      });
+  }, 'sec-fetch-dest attributes: as=script');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      t,
+      makeRequestURL(key, []),
+      {"as": "style"}
+    );
+
+    return retrieve(key, {poll:true})
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-dest');
+          assert_array_equals(headers['sec-fetch-dest'], ['style']);
+      });
+  }, 'sec-fetch-dest attributes: as=style');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      t,
+      makeRequestURL(key, []),
+      {"as": "track"}
+    );
+
+    return retrieve(key, {poll:true})
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-dest');
+          assert_array_equals(headers['sec-fetch-dest'], ['track']);
+      });
+  }, 'sec-fetch-dest attributes: as=track');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      t,
+      makeRequestURL(key, []),
+      {"as": "video"}
+    );
+
+    return retrieve(key, {poll:true})
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-dest');
+          assert_array_equals(headers['sec-fetch-dest'], ['video']);
+      });
+  }, 'sec-fetch-dest attributes: as=video');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      t,
+      makeRequestURL(key, []),
+      {"as": "worker"}
+    );
+
+    return retrieve(key, {poll:true})
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-dest');
+          assert_array_equals(headers['sec-fetch-dest'], ['worker']);
+      });
+  }, 'sec-fetch-dest attributes: as=worker');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      t,
+      makeRequestURL(key, []),
+      {}
+    );
+
+    return retrieve(key, {poll:true})
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+      });
+  }, 'sec-fetch-user no attributes');
+  </script>
+  </body>
+</html>
+
diff --git a/test/wpt/tests/fetch/metadata/generated/element-link-prefetch.optional.sub.html b/test/wpt/tests/fetch/metadata/generated/element-link-prefetch.optional.sub.html
new file mode 100644
index 00000000000..c2244883cc9
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/generated/element-link-prefetch.optional.sub.html
@@ -0,0 +1,275 @@
+<!DOCTYPE html>
+<!--
+This test was procedurally generated. Please do not modify it directly.
+Sources:
+- fetch/metadata/tools/fetch-metadata.conf.yml
+- fetch/metadata/tools/templates/element-link-prefetch.optional.sub.html
+-->
+<html lang="en">
+  <meta charset="utf-8">
+  <meta name="timeout" content="long">
+  <title>HTTP headers on request for HTML "link" element with rel="prefetch"</title>
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  <script src="/fetch/metadata/resources/helper.sub.js"></script>
+  <body>
+  <script>
+  'use strict';
+
+  /**
+   * The `link` element supports a `load` event. That event would reliably
+   * indicate that the browser had received the request. Multiple major
+   * browsers do not implement the event, however, so in order to promote the
+   * visibility of this test, a less efficient polling-based detection
+   * mechanism is used.
+   *
+   * https://bugzilla.mozilla.org/show_bug.cgi?id=1638188
+   * https://bugs.chromium.org/p/chromium/issues/detail?id=1083034
+   */
+  function induceRequest(t, url, attributes) {
+    const link = document.createElement('link');
+    link.setAttribute('rel', 'prefetch');
+    link.setAttribute('href', url);
+
+    for (const [ name, value ] of Object.entries(attributes)) {
+      link.setAttribute(name, value);
+    }
+
+    document.head.appendChild(link);
+    t.add_cleanup(() => link.remove());
+  }
+
+  setup(() => {
+    assert_implements_optional(document.createElement('link').relList.supports('prefetch'));
+  });
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      t,
+      makeRequestURL(key, ['httpOrigin']),
+      {}
+    );
+
+    return retrieve(key, {poll:true})
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+      });
+  }, 'sec-fetch-site - Not sent to non-trustworthy same-origin destination no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      t,
+      makeRequestURL(key, ['httpSameSite']),
+      {}
+    );
+
+    return retrieve(key, {poll:true})
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+      });
+  }, 'sec-fetch-site - Not sent to non-trustworthy same-site destination no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      t,
+      makeRequestURL(key, ['httpCrossSite']),
+      {}
+    );
+
+    return retrieve(key, {poll:true})
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+      });
+  }, 'sec-fetch-site - Not sent to non-trustworthy cross-site destination no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      t,
+      makeRequestURL(key, ['httpOrigin']),
+      {}
+    );
+
+    return retrieve(key, {poll:true})
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-mode');
+      });
+  }, 'sec-fetch-mode - Not sent to non-trustworthy same-origin destination no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      t,
+      makeRequestURL(key, ['httpSameSite']),
+      {}
+    );
+
+    return retrieve(key, {poll:true})
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-mode');
+      });
+  }, 'sec-fetch-mode - Not sent to non-trustworthy same-site destination no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      t,
+      makeRequestURL(key, ['httpCrossSite']),
+      {}
+    );
+
+    return retrieve(key, {poll:true})
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-mode');
+      });
+  }, 'sec-fetch-mode - Not sent to non-trustworthy cross-site destination no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      t,
+      makeRequestURL(key, ['httpOrigin']),
+      {}
+    );
+
+    return retrieve(key, {poll:true})
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-dest');
+      });
+  }, 'sec-fetch-dest - Not sent to non-trustworthy same-origin destination no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      t,
+      makeRequestURL(key, ['httpSameSite']),
+      {}
+    );
+
+    return retrieve(key, {poll:true})
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-dest');
+      });
+  }, 'sec-fetch-dest - Not sent to non-trustworthy same-site destination no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      t,
+      makeRequestURL(key, ['httpCrossSite']),
+      {}
+    );
+
+    return retrieve(key, {poll:true})
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-dest');
+      });
+  }, 'sec-fetch-dest - Not sent to non-trustworthy cross-site destination no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      t,
+      makeRequestURL(key, ['httpOrigin']),
+      {}
+    );
+
+    return retrieve(key, {poll:true})
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+      });
+  }, 'sec-fetch-user - Not sent to non-trustworthy same-origin destination no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      t,
+      makeRequestURL(key, ['httpSameSite']),
+      {}
+    );
+
+    return retrieve(key, {poll:true})
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+      });
+  }, 'sec-fetch-user - Not sent to non-trustworthy same-site destination no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      t,
+      makeRequestURL(key, ['httpCrossSite']),
+      {}
+    );
+
+    return retrieve(key, {poll:true})
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+      });
+  }, 'sec-fetch-user - Not sent to non-trustworthy cross-site destination no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      t,
+      makeRequestURL(key, ['httpsOrigin', 'httpOrigin']),
+      {}
+    );
+
+    return retrieve(key, {poll:true})
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+      });
+  }, 'sec-fetch-site - HTTPS downgrade (header not sent) no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      t,
+      makeRequestURL(key, ['httpOrigin', 'httpsOrigin']),
+      {}
+    );
+
+    return retrieve(key, {poll:true})
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+      });
+  }, 'sec-fetch-site - HTTPS upgrade no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      t,
+      makeRequestURL(key, ['httpsOrigin', 'httpOrigin', 'httpsOrigin']),
+      {}
+    );
+
+    return retrieve(key, {poll:true})
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+      });
+  }, 'sec-fetch-site - HTTPS downgrade-upgrade no attributes');
+  </script>
+  </body>
+</html>
+
diff --git a/test/wpt/tests/fetch/metadata/generated/element-meta-refresh.https.optional.sub.html b/test/wpt/tests/fetch/metadata/generated/element-meta-refresh.https.optional.sub.html
new file mode 100644
index 00000000000..3a1a8eb49af
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/generated/element-meta-refresh.https.optional.sub.html
@@ -0,0 +1,276 @@
+<!DOCTYPE html>
+<!--
+This test was procedurally generated. Please do not modify it directly.
+Sources:
+- fetch/metadata/tools/fetch-metadata.conf.yml
+- fetch/metadata/tools/templates/element-meta-refresh.optional.sub.html
+-->
+<html lang="en">
+  <meta charset="utf-8">
+  <title>HTTP headers on request for HTML "meta" element with http-equiv="refresh"</title>
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  <script src="/fetch/metadata/resources/helper.sub.js"></script>
+  <body>
+  <script>
+  'use strict';
+
+  function induceRequest(url, test) {
+    const win = window.open();
+    test.add_cleanup(() => win.close());
+
+    win.document.open();
+    win.document.write(
+      `<meta http-equiv="Refresh" content="0; URL=${url}">`
+    );
+    win.document.close();
+
+    return new Promise((resolve) => {
+      addEventListener('message', (event) => {
+          if (event.source === win) {
+            resolve();
+          }
+        });
+    });
+  }
+
+  const responseParams = {
+    mime: 'text/html',
+    body: `<script>opener.postMessage(0, '*')</${''}script>`
+  };
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsOrigin'], responseParams), t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-origin']);
+        });
+  }, 'sec-fetch-site - Same origin');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsCrossSite'], responseParams), t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Cross-site');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsSameSite'], responseParams), t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - Same site');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsOrigin', 'httpsCrossSite', 'httpsOrigin'], responseParams), t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Same-Origin -> Cross-Site -> Same-Origin redirect');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsOrigin', 'httpsSameSite', 'httpsOrigin'], responseParams), t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - Same-Origin -> Same-Site -> Same-Origin redirect');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsCrossSite', 'httpsOrigin'], responseParams), t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Cross-Site -> Same Origin');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsCrossSite', 'httpsSameSite'], responseParams), t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Cross-Site -> Same-Site');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsCrossSite', 'httpsCrossSite'], responseParams), t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Cross-Site -> Cross-Site');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsOrigin', 'httpsOrigin'], responseParams), t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-origin']);
+        });
+  }, 'sec-fetch-site - Same-Origin -> Same Origin');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsOrigin', 'httpsSameSite'], responseParams), t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - Same-Origin -> Same-Site');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsOrigin', 'httpsCrossSite'], responseParams), t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Same-Origin -> Cross-Site');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsSameSite', 'httpsOrigin'], responseParams), t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - Same-Site -> Same Origin');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsSameSite', 'httpsSameSite'], responseParams), t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - Same-Site -> Same-Site');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsSameSite', 'httpsCrossSite'], responseParams), t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Same-Site -> Cross-Site');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsOrigin', 'httpOrigin', 'httpsOrigin'], responseParams), t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - HTTPS downgrade-upgrade');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, [], responseParams), t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-mode');
+          assert_array_equals(headers['sec-fetch-mode'], ['navigate']);
+        });
+  }, 'sec-fetch-mode');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, [], responseParams), t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-dest');
+          assert_array_equals(headers['sec-fetch-dest'], ['document']);
+        });
+  }, 'sec-fetch-dest');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, [], responseParams), t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user');
+  </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/fetch/metadata/generated/element-meta-refresh.optional.sub.html b/test/wpt/tests/fetch/metadata/generated/element-meta-refresh.optional.sub.html
new file mode 100644
index 00000000000..df3e92e2c8f
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/generated/element-meta-refresh.optional.sub.html
@@ -0,0 +1,225 @@
+<!DOCTYPE html>
+<!--
+This test was procedurally generated. Please do not modify it directly.
+Sources:
+- fetch/metadata/tools/fetch-metadata.conf.yml
+- fetch/metadata/tools/templates/element-meta-refresh.optional.sub.html
+-->
+<html lang="en">
+  <meta charset="utf-8">
+  <title>HTTP headers on request for HTML "meta" element with http-equiv="refresh"</title>
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  <script src="/fetch/metadata/resources/helper.sub.js"></script>
+  <body>
+  <script>
+  'use strict';
+
+  function induceRequest(url, test) {
+    const win = window.open();
+    test.add_cleanup(() => win.close());
+
+    win.document.open();
+    win.document.write(
+      `<meta http-equiv="Refresh" content="0; URL=${url}">`
+    );
+    win.document.close();
+
+    return new Promise((resolve) => {
+      addEventListener('message', (event) => {
+          if (event.source === win) {
+            resolve();
+          }
+        });
+    });
+  }
+
+  const responseParams = {
+    mime: 'text/html',
+    body: `<script>opener.postMessage(0, '*')</${''}script>`
+  };
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpOrigin'], responseParams), t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        });
+  }, 'sec-fetch-site - Not sent to non-trustworthy same-origin destination');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpSameSite'], responseParams), t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        });
+  }, 'sec-fetch-site - Not sent to non-trustworthy same-site destination');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpCrossSite'], responseParams), t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        });
+  }, 'sec-fetch-site - Not sent to non-trustworthy cross-site destination');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpOrigin'], responseParams), t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-mode');
+        });
+  }, 'sec-fetch-mode - Not sent to non-trustworthy same-origin destination');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpSameSite'], responseParams), t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-mode');
+        });
+  }, 'sec-fetch-mode - Not sent to non-trustworthy same-site destination');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpCrossSite'], responseParams), t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-mode');
+        });
+  }, 'sec-fetch-mode - Not sent to non-trustworthy cross-site destination');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpOrigin'], responseParams), t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-dest');
+        });
+  }, 'sec-fetch-dest - Not sent to non-trustworthy same-origin destination');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpSameSite'], responseParams), t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-dest');
+        });
+  }, 'sec-fetch-dest - Not sent to non-trustworthy same-site destination');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpCrossSite'], responseParams), t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-dest');
+        });
+  }, 'sec-fetch-dest - Not sent to non-trustworthy cross-site destination');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpOrigin'], responseParams), t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user - Not sent to non-trustworthy same-origin destination');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpSameSite'], responseParams), t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user - Not sent to non-trustworthy same-site destination');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpCrossSite'], responseParams), t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user - Not sent to non-trustworthy cross-site destination');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsOrigin', 'httpOrigin'], responseParams), t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        });
+  }, 'sec-fetch-site - HTTPS downgrade (header not sent)');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpOrigin', 'httpsOrigin'], responseParams), t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - HTTPS upgrade');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsOrigin', 'httpOrigin', 'httpsOrigin'], responseParams), t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - HTTPS downgrade-upgrade');
+  </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/fetch/metadata/generated/element-picture.https.sub.html b/test/wpt/tests/fetch/metadata/generated/element-picture.https.sub.html
new file mode 100644
index 00000000000..ba6636a019a
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/generated/element-picture.https.sub.html
@@ -0,0 +1,997 @@
+<!DOCTYPE html>
+<!--
+This test was procedurally generated. Please do not modify it directly.
+Sources:
+- fetch/metadata/tools/fetch-metadata.conf.yml
+- fetch/metadata/tools/templates/element-picture.sub.html
+-->
+<html lang="en">
+  <meta charset="utf-8">
+  <title>HTTP headers on request for HTML "picture" element source</title>
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  <script src="/fetch/metadata/resources/helper.sub.js"></script>
+  <body>
+  <script>
+  'use strict';
+
+  function induceRequest(url, sourceEl, sourceAttr, attributes) {
+    const picture = document.createElement('picture');
+    const els = {
+      img: document.createElement('img'),
+      source: document.createElement('source')
+    };
+    picture.appendChild(els.source);
+    picture.appendChild(els.img);
+    document.body.appendChild(picture);
+
+    for (const [ name, value ] of Object.entries(attributes)) {
+      els.img.setAttribute(name, value);
+    }
+
+    return new Promise((resolve) => {
+        els[sourceEl].setAttribute(sourceAttr, url);
+        els.img.onload = els.img.onerror = resolve;
+      });
+  }
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsOrigin']),
+        'img',
+        'src',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-origin']);
+        });
+  }, 'sec-fetch-site - img[src] - Same origin, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsOrigin']),
+        'img',
+        'srcset',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-origin']);
+        });
+  }, 'sec-fetch-site - img[srcset] - Same origin, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsOrigin']),
+        'source',
+        'srcset',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-origin']);
+        });
+  }, 'sec-fetch-site - source[srcset] - Same origin, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsCrossSite']),
+        'img',
+        'src',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - img[src] - Cross-site, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsCrossSite']),
+        'img',
+        'srcset',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - img[srcset] - Cross-site, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsCrossSite']),
+        'source',
+        'srcset',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - source[srcset] - Cross-site, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsSameSite']),
+        'img',
+        'src',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - img[src] - Same site, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsSameSite']),
+        'img',
+        'srcset',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - img[srcset] - Same site, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsSameSite']),
+        'source',
+        'srcset',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - source[srcset] - Same site, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsOrigin', 'httpsCrossSite', 'httpsOrigin']),
+        'img',
+        'src',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - img[src] - Same-Origin -> Cross-Site -> Same-Origin redirect, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsOrigin', 'httpsCrossSite', 'httpsOrigin']),
+        'img',
+        'srcset',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - img[srcset] - Same-Origin -> Cross-Site -> Same-Origin redirect, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsOrigin', 'httpsCrossSite', 'httpsOrigin']),
+        'source',
+        'srcset',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - source[srcset] - Same-Origin -> Cross-Site -> Same-Origin redirect, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsOrigin', 'httpsSameSite', 'httpsOrigin']),
+        'img',
+        'src',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - img[src] - Same-Origin -> Same-Site -> Same-Origin redirect, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsOrigin', 'httpsSameSite', 'httpsOrigin']),
+        'img',
+        'srcset',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - img[srcset] - Same-Origin -> Same-Site -> Same-Origin redirect, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsOrigin', 'httpsSameSite', 'httpsOrigin']),
+        'source',
+        'srcset',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - source[srcset] - Same-Origin -> Same-Site -> Same-Origin redirect, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsCrossSite', 'httpsOrigin']),
+        'img',
+        'src',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - img[src] - Cross-Site -> Same Origin, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsCrossSite', 'httpsOrigin']),
+        'img',
+        'srcset',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - img[srcset] - Cross-Site -> Same Origin, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsCrossSite', 'httpsOrigin']),
+        'source',
+        'srcset',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - source[srcset] - Cross-Site -> Same Origin, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsCrossSite', 'httpsSameSite']),
+        'img',
+        'src',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - img[src] - Cross-Site -> Same-Site, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsCrossSite', 'httpsSameSite']),
+        'img',
+        'srcset',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - img[srcset] - Cross-Site -> Same-Site, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsCrossSite', 'httpsSameSite']),
+        'source',
+        'srcset',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - source[srcset] - Cross-Site -> Same-Site, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsCrossSite', 'httpsCrossSite']),
+        'img',
+        'src',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - img[src] - Cross-Site -> Cross-Site, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsCrossSite', 'httpsCrossSite']),
+        'img',
+        'srcset',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - img[srcset] - Cross-Site -> Cross-Site, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsCrossSite', 'httpsCrossSite']),
+        'source',
+        'srcset',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - source[srcset] - Cross-Site -> Cross-Site, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsOrigin', 'httpsOrigin']),
+        'img',
+        'src',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-origin']);
+        });
+  }, 'sec-fetch-site - img[src] - Same-Origin -> Same Origin, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsOrigin', 'httpsOrigin']),
+        'img',
+        'srcset',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-origin']);
+        });
+  }, 'sec-fetch-site - img[srcset] - Same-Origin -> Same Origin, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsOrigin', 'httpsOrigin']),
+        'source',
+        'srcset',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-origin']);
+        });
+  }, 'sec-fetch-site - source[srcset] - Same-Origin -> Same Origin, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsOrigin', 'httpsSameSite']),
+        'img',
+        'src',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - img[src] - Same-Origin -> Same-Site, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsOrigin', 'httpsSameSite']),
+        'img',
+        'srcset',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - img[srcset] - Same-Origin -> Same-Site, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsOrigin', 'httpsSameSite']),
+        'source',
+        'srcset',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - source[srcset] - Same-Origin -> Same-Site, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsOrigin', 'httpsCrossSite']),
+        'img',
+        'src',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - img[src] - Same-Origin -> Cross-Site, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsOrigin', 'httpsCrossSite']),
+        'img',
+        'srcset',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - img[srcset] - Same-Origin -> Cross-Site, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsOrigin', 'httpsCrossSite']),
+        'source',
+        'srcset',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - source[srcset] - Same-Origin -> Cross-Site, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsSameSite', 'httpsOrigin']),
+        'img',
+        'src',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - img[src] - Same-Site -> Same Origin, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsSameSite', 'httpsOrigin']),
+        'img',
+        'srcset',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - img[srcset] - Same-Site -> Same Origin, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsSameSite', 'httpsOrigin']),
+        'source',
+        'srcset',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - source[srcset] - Same-Site -> Same Origin, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsSameSite', 'httpsSameSite']),
+        'img',
+        'src',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - img[src] - Same-Site -> Same-Site, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsSameSite', 'httpsSameSite']),
+        'img',
+        'srcset',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - img[srcset] - Same-Site -> Same-Site, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsSameSite', 'httpsSameSite']),
+        'source',
+        'srcset',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - source[srcset] - Same-Site -> Same-Site, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsSameSite', 'httpsCrossSite']),
+        'img',
+        'src',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - img[src] - Same-Site -> Cross-Site, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsSameSite', 'httpsCrossSite']),
+        'img',
+        'srcset',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - img[srcset] - Same-Site -> Cross-Site, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsSameSite', 'httpsCrossSite']),
+        'source',
+        'srcset',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - source[srcset] - Same-Site -> Cross-Site, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, []),
+        'img',
+        'src',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-mode');
+          assert_array_equals(headers['sec-fetch-mode'], ['no-cors']);
+        });
+  }, 'sec-fetch-mode - img[src] - no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, []),
+        'img',
+        'srcset',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-mode');
+          assert_array_equals(headers['sec-fetch-mode'], ['no-cors']);
+        });
+  }, 'sec-fetch-mode - img[srcset] - no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, []),
+        'source',
+        'srcset',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-mode');
+          assert_array_equals(headers['sec-fetch-mode'], ['no-cors']);
+        });
+  }, 'sec-fetch-mode - source[srcset] - no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, []),
+        'img',
+        'src',
+        {"crossorigin": ""}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-mode');
+          assert_array_equals(headers['sec-fetch-mode'], ['cors']);
+        });
+  }, 'sec-fetch-mode - img[src] - attributes: crossorigin');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, []),
+        'img',
+        'srcset',
+        {"crossorigin": ""}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-mode');
+          assert_array_equals(headers['sec-fetch-mode'], ['cors']);
+        });
+  }, 'sec-fetch-mode - img[srcset] - attributes: crossorigin');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, []),
+        'source',
+        'srcset',
+        {"crossorigin": ""}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-mode');
+          assert_array_equals(headers['sec-fetch-mode'], ['cors']);
+        });
+  }, 'sec-fetch-mode - source[srcset] - attributes: crossorigin');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, []),
+        'img',
+        'src',
+        {"crossorigin": "anonymous"}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-mode');
+          assert_array_equals(headers['sec-fetch-mode'], ['cors']);
+        });
+  }, 'sec-fetch-mode - img[src] - attributes: crossorigin=anonymous');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, []),
+        'img',
+        'srcset',
+        {"crossorigin": "anonymous"}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-mode');
+          assert_array_equals(headers['sec-fetch-mode'], ['cors']);
+        });
+  }, 'sec-fetch-mode - img[srcset] - attributes: crossorigin=anonymous');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, []),
+        'source',
+        'srcset',
+        {"crossorigin": "anonymous"}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-mode');
+          assert_array_equals(headers['sec-fetch-mode'], ['cors']);
+        });
+  }, 'sec-fetch-mode - source[srcset] - attributes: crossorigin=anonymous');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, []),
+        'img',
+        'src',
+        {"crossorigin": "use-credentials"}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-mode');
+          assert_array_equals(headers['sec-fetch-mode'], ['cors']);
+        });
+  }, 'sec-fetch-mode - img[src] - attributes: crossorigin=use-credentials');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, []),
+        'img',
+        'srcset',
+        {"crossorigin": "use-credentials"}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-mode');
+          assert_array_equals(headers['sec-fetch-mode'], ['cors']);
+        });
+  }, 'sec-fetch-mode - img[srcset] - attributes: crossorigin=use-credentials');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, []),
+        'source',
+        'srcset',
+        {"crossorigin": "use-credentials"}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-mode');
+          assert_array_equals(headers['sec-fetch-mode'], ['cors']);
+        });
+  }, 'sec-fetch-mode - source[srcset] - attributes: crossorigin=use-credentials');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, []),
+        'img',
+        'src',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-dest');
+          assert_array_equals(headers['sec-fetch-dest'], ['image']);
+        });
+  }, 'sec-fetch-dest - img[src] - no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, []),
+        'img',
+        'srcset',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-dest');
+          assert_array_equals(headers['sec-fetch-dest'], ['image']);
+        });
+  }, 'sec-fetch-dest - img[srcset] - no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, []),
+        'source',
+        'srcset',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-dest');
+          assert_array_equals(headers['sec-fetch-dest'], ['image']);
+        });
+  }, 'sec-fetch-dest - source[srcset] - no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, []),
+        'img',
+        'src',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user - img[src] - no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, []),
+        'img',
+        'srcset',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user - img[srcset] - no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, []),
+        'source',
+        'srcset',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user - source[srcset] - no attributes');
+  </script>
+  </body>
+</html>
+
diff --git a/test/wpt/tests/fetch/metadata/generated/element-picture.sub.html b/test/wpt/tests/fetch/metadata/generated/element-picture.sub.html
new file mode 100644
index 00000000000..64f851c682b
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/generated/element-picture.sub.html
@@ -0,0 +1,721 @@
+<!DOCTYPE html>
+<!--
+This test was procedurally generated. Please do not modify it directly.
+Sources:
+- fetch/metadata/tools/fetch-metadata.conf.yml
+- fetch/metadata/tools/templates/element-picture.sub.html
+-->
+<html lang="en">
+  <meta charset="utf-8">
+  <title>HTTP headers on request for HTML "picture" element source</title>
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  <script src="/fetch/metadata/resources/helper.sub.js"></script>
+  <body>
+  <script>
+  'use strict';
+
+  function induceRequest(url, sourceEl, sourceAttr, attributes) {
+    const picture = document.createElement('picture');
+    const els = {
+      img: document.createElement('img'),
+      source: document.createElement('source')
+    };
+    picture.appendChild(els.source);
+    picture.appendChild(els.img);
+    document.body.appendChild(picture);
+
+    for (const [ name, value ] of Object.entries(attributes)) {
+      els.img.setAttribute(name, value);
+    }
+
+    return new Promise((resolve) => {
+        els[sourceEl].setAttribute(sourceAttr, url);
+        els.img.onload = els.img.onerror = resolve;
+      });
+  }
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpOrigin']),
+        'img',
+        'src',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        });
+  }, 'sec-fetch-site - img[src] - Not sent to non-trustworthy same-origin destination, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpOrigin']),
+        'img',
+        'srcset',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        });
+  }, 'sec-fetch-site - img[srcset] - Not sent to non-trustworthy same-origin destination, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpOrigin']),
+        'source',
+        'srcset',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        });
+  }, 'sec-fetch-site - source[srcset] - Not sent to non-trustworthy same-origin destination, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpSameSite']),
+        'img',
+        'src',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        });
+  }, 'sec-fetch-site - img[src] - Not sent to non-trustworthy same-site destination, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpSameSite']),
+        'img',
+        'srcset',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        });
+  }, 'sec-fetch-site - img[srcset] - Not sent to non-trustworthy same-site destination, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpSameSite']),
+        'source',
+        'srcset',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        });
+  }, 'sec-fetch-site - source[srcset] - Not sent to non-trustworthy same-site destination, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpCrossSite']),
+        'img',
+        'src',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        });
+  }, 'sec-fetch-site - img[src] - Not sent to non-trustworthy cross-site destination, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpCrossSite']),
+        'img',
+        'srcset',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        });
+  }, 'sec-fetch-site - img[srcset] - Not sent to non-trustworthy cross-site destination, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpCrossSite']),
+        'source',
+        'srcset',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        });
+  }, 'sec-fetch-site - source[srcset] - Not sent to non-trustworthy cross-site destination, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpOrigin']),
+        'img',
+        'src',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-mode');
+        });
+  }, 'sec-fetch-mode - img[src] - Not sent to non-trustworthy same-origin destination, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpOrigin']),
+        'img',
+        'srcset',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-mode');
+        });
+  }, 'sec-fetch-mode - img[srcset] - Not sent to non-trustworthy same-origin destination, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpOrigin']),
+        'source',
+        'srcset',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-mode');
+        });
+  }, 'sec-fetch-mode - source[srcset] - Not sent to non-trustworthy same-origin destination, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpSameSite']),
+        'img',
+        'src',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-mode');
+        });
+  }, 'sec-fetch-mode - img[src] - Not sent to non-trustworthy same-site destination, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpSameSite']),
+        'img',
+        'srcset',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-mode');
+        });
+  }, 'sec-fetch-mode - img[srcset] - Not sent to non-trustworthy same-site destination, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpSameSite']),
+        'source',
+        'srcset',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-mode');
+        });
+  }, 'sec-fetch-mode - source[srcset] - Not sent to non-trustworthy same-site destination, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpCrossSite']),
+        'img',
+        'src',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-mode');
+        });
+  }, 'sec-fetch-mode - img[src] - Not sent to non-trustworthy cross-site destination, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpCrossSite']),
+        'img',
+        'srcset',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-mode');
+        });
+  }, 'sec-fetch-mode - img[srcset] - Not sent to non-trustworthy cross-site destination, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpCrossSite']),
+        'source',
+        'srcset',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-mode');
+        });
+  }, 'sec-fetch-mode - source[srcset] - Not sent to non-trustworthy cross-site destination, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpOrigin']),
+        'img',
+        'src',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-dest');
+        });
+  }, 'sec-fetch-dest - img[src] - Not sent to non-trustworthy same-origin destination, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpOrigin']),
+        'img',
+        'srcset',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-dest');
+        });
+  }, 'sec-fetch-dest - img[srcset] - Not sent to non-trustworthy same-origin destination, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpOrigin']),
+        'source',
+        'srcset',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-dest');
+        });
+  }, 'sec-fetch-dest - source[srcset] - Not sent to non-trustworthy same-origin destination, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpSameSite']),
+        'img',
+        'src',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-dest');
+        });
+  }, 'sec-fetch-dest - img[src] - Not sent to non-trustworthy same-site destination, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpSameSite']),
+        'img',
+        'srcset',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-dest');
+        });
+  }, 'sec-fetch-dest - img[srcset] - Not sent to non-trustworthy same-site destination, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpSameSite']),
+        'source',
+        'srcset',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-dest');
+        });
+  }, 'sec-fetch-dest - source[srcset] - Not sent to non-trustworthy same-site destination, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpCrossSite']),
+        'img',
+        'src',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-dest');
+        });
+  }, 'sec-fetch-dest - img[src] - Not sent to non-trustworthy cross-site destination, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpCrossSite']),
+        'img',
+        'srcset',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-dest');
+        });
+  }, 'sec-fetch-dest - img[srcset] - Not sent to non-trustworthy cross-site destination, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpCrossSite']),
+        'source',
+        'srcset',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-dest');
+        });
+  }, 'sec-fetch-dest - source[srcset] - Not sent to non-trustworthy cross-site destination, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpOrigin']),
+        'img',
+        'src',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user - img[src] - Not sent to non-trustworthy same-origin destination, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpOrigin']),
+        'img',
+        'srcset',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user - img[srcset] - Not sent to non-trustworthy same-origin destination, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpOrigin']),
+        'source',
+        'srcset',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user - source[srcset] - Not sent to non-trustworthy same-origin destination, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpSameSite']),
+        'img',
+        'src',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user - img[src] - Not sent to non-trustworthy same-site destination, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpSameSite']),
+        'img',
+        'srcset',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user - img[srcset] - Not sent to non-trustworthy same-site destination, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpSameSite']),
+        'source',
+        'srcset',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user - source[srcset] - Not sent to non-trustworthy same-site destination, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpCrossSite']),
+        'img',
+        'src',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user - img[src] - Not sent to non-trustworthy cross-site destination, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpCrossSite']),
+        'img',
+        'srcset',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user - img[srcset] - Not sent to non-trustworthy cross-site destination, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpCrossSite']),
+        'source',
+        'srcset',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user - source[srcset] - Not sent to non-trustworthy cross-site destination, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsOrigin', 'httpOrigin']),
+        'img',
+        'src',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        });
+  }, 'sec-fetch-site - img[src] - HTTPS downgrade (header not sent), no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsOrigin', 'httpOrigin']),
+        'img',
+        'srcset',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        });
+  }, 'sec-fetch-site - img[srcset] - HTTPS downgrade (header not sent), no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsOrigin', 'httpOrigin']),
+        'source',
+        'srcset',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        });
+  }, 'sec-fetch-site - source[srcset] - HTTPS downgrade (header not sent), no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpOrigin', 'httpsOrigin']),
+        'img',
+        'src',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - img[src] - HTTPS upgrade, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpOrigin', 'httpsOrigin']),
+        'img',
+        'srcset',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - img[srcset] - HTTPS upgrade, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpOrigin', 'httpsOrigin']),
+        'source',
+        'srcset',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - source[srcset] - HTTPS upgrade, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsOrigin', 'httpOrigin', 'httpsOrigin']),
+        'img',
+        'src',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - img[src] - HTTPS downgrade-upgrade, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsOrigin', 'httpOrigin', 'httpsOrigin']),
+        'img',
+        'srcset',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - img[srcset] - HTTPS downgrade-upgrade, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsOrigin', 'httpOrigin', 'httpsOrigin']),
+        'source',
+        'srcset',
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - source[srcset] - HTTPS downgrade-upgrade, no attributes');
+  </script>
+  </body>
+</html>
+
diff --git a/test/wpt/tests/fetch/metadata/generated/element-script.https.sub.html b/test/wpt/tests/fetch/metadata/generated/element-script.https.sub.html
new file mode 100644
index 00000000000..dcdcba2792d
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/generated/element-script.https.sub.html
@@ -0,0 +1,593 @@
+<!DOCTYPE html>
+<!--
+This test was procedurally generated. Please do not modify it directly.
+Sources:
+- fetch/metadata/tools/fetch-metadata.conf.yml
+- fetch/metadata/tools/templates/element-script.sub.html
+-->
+<html lang="en">
+  <meta charset="utf-8">
+  <title>HTTP headers on request for HTML "script" element source</title>
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  <script src="/fetch/metadata/resources/helper.sub.js"></script>
+  <body>
+  <script>
+  'use strict';
+
+  function induceRequest(url, attributes) {
+    const script = document.createElement('script');
+    script.setAttribute('src', url);
+
+    for (const [ name, value ] of Object.entries(attributes)) {
+      script.setAttribute(name, value);
+    }
+
+    return new Promise((resolve, reject) => {
+        script.onload = resolve;
+        script.onerror = () => reject('Failed to load script');
+        document.body.appendChild(script);
+      })
+      .then(() => script.remove());
+  }
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, ['httpsOrigin'], { mime: 'application/javascript' }
+    );
+
+    return induceRequest(url,
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-origin']);
+        });
+  }, 'sec-fetch-site - Same origin, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, ['httpsOrigin'], { mime: 'application/javascript' }
+    );
+
+    return induceRequest(url,
+        {"type": "module"}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-origin']);
+        });
+  }, 'sec-fetch-site - Same origin, attributes: type=module');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, ['httpsCrossSite'], { mime: 'application/javascript' }
+    );
+
+    return induceRequest(url,
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Cross-site, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, ['httpsCrossSite'], { mime: 'application/javascript' }
+    );
+
+    return induceRequest(url,
+        {"type": "module"}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Cross-site, attributes: type=module');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, ['httpsSameSite'], { mime: 'application/javascript' }
+    );
+
+    return induceRequest(url,
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - Same site, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, ['httpsSameSite'], { mime: 'application/javascript' }
+    );
+
+    return induceRequest(url,
+        {"type": "module"}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - Same site, attributes: type=module');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, ['httpsOrigin', 'httpsCrossSite', 'httpsOrigin'], { mime: 'application/javascript' }
+    );
+
+    return induceRequest(url,
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Same-Origin -> Cross-Site -> Same-Origin redirect, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, ['httpsOrigin', 'httpsCrossSite', 'httpsOrigin'], { mime: 'application/javascript' }
+    );
+
+    return induceRequest(url,
+        {"type": "module"}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Same-Origin -> Cross-Site -> Same-Origin redirect, attributes: type=module');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, ['httpsOrigin', 'httpsSameSite', 'httpsOrigin'], { mime: 'application/javascript' }
+    );
+
+    return induceRequest(url,
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - Same-Origin -> Same-Site -> Same-Origin redirect, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, ['httpsOrigin', 'httpsSameSite', 'httpsOrigin'], { mime: 'application/javascript' }
+    );
+
+    return induceRequest(url,
+        {"type": "module"}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - Same-Origin -> Same-Site -> Same-Origin redirect, attributes: type=module');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, ['httpsCrossSite', 'httpsOrigin'], { mime: 'application/javascript' }
+    );
+
+    return induceRequest(url,
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Cross-Site -> Same Origin, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, ['httpsCrossSite', 'httpsOrigin'], { mime: 'application/javascript' }
+    );
+
+    return induceRequest(url,
+        {"type": "module"}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Cross-Site -> Same Origin, attributes: type=module');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, ['httpsCrossSite', 'httpsSameSite'], { mime: 'application/javascript' }
+    );
+
+    return induceRequest(url,
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Cross-Site -> Same-Site, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, ['httpsCrossSite', 'httpsSameSite'], { mime: 'application/javascript' }
+    );
+
+    return induceRequest(url,
+        {"type": "module"}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Cross-Site -> Same-Site, attributes: type=module');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, ['httpsCrossSite', 'httpsCrossSite'], { mime: 'application/javascript' }
+    );
+
+    return induceRequest(url,
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Cross-Site -> Cross-Site, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, ['httpsCrossSite', 'httpsCrossSite'], { mime: 'application/javascript' }
+    );
+
+    return induceRequest(url,
+        {"type": "module"}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Cross-Site -> Cross-Site, attributes: type=module');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, ['httpsOrigin', 'httpsOrigin'], { mime: 'application/javascript' }
+    );
+
+    return induceRequest(url,
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-origin']);
+        });
+  }, 'sec-fetch-site - Same-Origin -> Same Origin, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, ['httpsOrigin', 'httpsOrigin'], { mime: 'application/javascript' }
+    );
+
+    return induceRequest(url,
+        {"type": "module"}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-origin']);
+        });
+  }, 'sec-fetch-site - Same-Origin -> Same Origin, attributes: type=module');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, ['httpsOrigin', 'httpsSameSite'], { mime: 'application/javascript' }
+    );
+
+    return induceRequest(url,
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - Same-Origin -> Same-Site, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, ['httpsOrigin', 'httpsSameSite'], { mime: 'application/javascript' }
+    );
+
+    return induceRequest(url,
+        {"type": "module"}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - Same-Origin -> Same-Site, attributes: type=module');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, ['httpsOrigin', 'httpsCrossSite'], { mime: 'application/javascript' }
+    );
+
+    return induceRequest(url,
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Same-Origin -> Cross-Site, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, ['httpsOrigin', 'httpsCrossSite'], { mime: 'application/javascript' }
+    );
+
+    return induceRequest(url,
+        {"type": "module"}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Same-Origin -> Cross-Site, attributes: type=module');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, ['httpsSameSite', 'httpsOrigin'], { mime: 'application/javascript' }
+    );
+
+    return induceRequest(url,
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - Same-Site -> Same Origin, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, ['httpsSameSite', 'httpsOrigin'], { mime: 'application/javascript' }
+    );
+
+    return induceRequest(url,
+        {"type": "module"}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - Same-Site -> Same Origin, attributes: type=module');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, ['httpsSameSite', 'httpsSameSite'], { mime: 'application/javascript' }
+    );
+
+    return induceRequest(url,
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - Same-Site -> Same-Site, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, ['httpsSameSite', 'httpsSameSite'], { mime: 'application/javascript' }
+    );
+
+    return induceRequest(url,
+        {"type": "module"}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - Same-Site -> Same-Site, attributes: type=module');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, ['httpsSameSite', 'httpsCrossSite'], { mime: 'application/javascript' }
+    );
+
+    return induceRequest(url,
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Same-Site -> Cross-Site, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, ['httpsSameSite', 'httpsCrossSite'], { mime: 'application/javascript' }
+    );
+
+    return induceRequest(url,
+        {"type": "module"}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Same-Site -> Cross-Site, attributes: type=module');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, [], { mime: 'application/javascript' }
+    );
+
+    return induceRequest(url,
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-mode');
+          assert_array_equals(headers['sec-fetch-mode'], ['no-cors']);
+        });
+  }, 'sec-fetch-mode - no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, [], { mime: 'application/javascript' }
+    );
+
+    return induceRequest(url,
+        {"type": "module"}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-mode');
+          assert_array_equals(headers['sec-fetch-mode'], ['cors']);
+        });
+  }, 'sec-fetch-mode - attributes: type=module');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, [], { mime: 'application/javascript' }
+    );
+
+    return induceRequest(url,
+        {"crossorigin": ""}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-mode');
+          assert_array_equals(headers['sec-fetch-mode'], ['cors']);
+        });
+  }, 'sec-fetch-mode - attributes: crossorigin');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, [], { mime: 'application/javascript' }
+    );
+
+    return induceRequest(url,
+        {"crossorigin": "anonymous"}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-mode');
+          assert_array_equals(headers['sec-fetch-mode'], ['cors']);
+        });
+  }, 'sec-fetch-mode - attributes: crossorigin=anonymous');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, [], { mime: 'application/javascript' }
+    );
+
+    return induceRequest(url,
+        {"crossorigin": "use-credentials"}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-mode');
+          assert_array_equals(headers['sec-fetch-mode'], ['cors']);
+        });
+  }, 'sec-fetch-mode - attributes: crossorigin=use-credentials');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, [], { mime: 'application/javascript' }
+    );
+
+    return induceRequest(url,
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-dest');
+          assert_array_equals(headers['sec-fetch-dest'], ['script']);
+        });
+  }, 'sec-fetch-dest - no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, [], { mime: 'application/javascript' }
+    );
+
+    return induceRequest(url,
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user - no attributes');
+  </script>
+</html>
diff --git a/test/wpt/tests/fetch/metadata/generated/element-script.sub.html b/test/wpt/tests/fetch/metadata/generated/element-script.sub.html
new file mode 100644
index 00000000000..a2526698fbd
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/generated/element-script.sub.html
@@ -0,0 +1,488 @@
+<!DOCTYPE html>
+<!--
+This test was procedurally generated. Please do not modify it directly.
+Sources:
+- fetch/metadata/tools/fetch-metadata.conf.yml
+- fetch/metadata/tools/templates/element-script.sub.html
+-->
+<html lang="en">
+  <meta charset="utf-8">
+  <title>HTTP headers on request for HTML "script" element source</title>
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  <script src="/fetch/metadata/resources/helper.sub.js"></script>
+  <body>
+  <script>
+  'use strict';
+
+  function induceRequest(url, attributes) {
+    const script = document.createElement('script');
+    script.setAttribute('src', url);
+
+    for (const [ name, value ] of Object.entries(attributes)) {
+      script.setAttribute(name, value);
+    }
+
+    return new Promise((resolve, reject) => {
+        script.onload = resolve;
+        script.onerror = () => reject('Failed to load script');
+        document.body.appendChild(script);
+      })
+      .then(() => script.remove());
+  }
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, ['httpOrigin'], { mime: 'application/javascript' }
+    );
+
+    return induceRequest(url,
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        });
+  }, 'sec-fetch-site - Not sent to non-trustworthy same-origin destination, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, ['httpOrigin'], { mime: 'application/javascript' }
+    );
+
+    return induceRequest(url,
+        {"type": "module"}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        });
+  }, 'sec-fetch-site - Not sent to non-trustworthy same-origin destination, attributes: type=module');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, ['httpSameSite'], { mime: 'application/javascript' }
+    );
+
+    return induceRequest(url,
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        });
+  }, 'sec-fetch-site - Not sent to non-trustworthy same-site destination, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, ['httpSameSite'], { mime: 'application/javascript' }
+    );
+
+    return induceRequest(url,
+        {"type": "module"}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        });
+  }, 'sec-fetch-site - Not sent to non-trustworthy same-site destination, attributes: type=module');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, ['httpCrossSite'], { mime: 'application/javascript' }
+    );
+
+    return induceRequest(url,
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        });
+  }, 'sec-fetch-site - Not sent to non-trustworthy cross-site destination, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, ['httpCrossSite'], { mime: 'application/javascript' }
+    );
+
+    return induceRequest(url,
+        {"type": "module"}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        });
+  }, 'sec-fetch-site - Not sent to non-trustworthy cross-site destination, attributes: type=module');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, ['httpOrigin'], { mime: 'application/javascript' }
+    );
+
+    return induceRequest(url,
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-mode');
+        });
+  }, 'sec-fetch-mode - Not sent to non-trustworthy same-origin destination, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, ['httpOrigin'], { mime: 'application/javascript' }
+    );
+
+    return induceRequest(url,
+        {"type": "module"}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-mode');
+        });
+  }, 'sec-fetch-mode - Not sent to non-trustworthy same-origin destination, attributes: type=module');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, ['httpSameSite'], { mime: 'application/javascript' }
+    );
+
+    return induceRequest(url,
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-mode');
+        });
+  }, 'sec-fetch-mode - Not sent to non-trustworthy same-site destination, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, ['httpSameSite'], { mime: 'application/javascript' }
+    );
+
+    return induceRequest(url,
+        {"type": "module"}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-mode');
+        });
+  }, 'sec-fetch-mode - Not sent to non-trustworthy same-site destination, attributes: type=module');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, ['httpCrossSite'], { mime: 'application/javascript' }
+    );
+
+    return induceRequest(url,
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-mode');
+        });
+  }, 'sec-fetch-mode - Not sent to non-trustworthy cross-site destination, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, ['httpCrossSite'], { mime: 'application/javascript' }
+    );
+
+    return induceRequest(url,
+        {"type": "module"}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-mode');
+        });
+  }, 'sec-fetch-mode - Not sent to non-trustworthy cross-site destination, attributes: type=module');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, ['httpOrigin'], { mime: 'application/javascript' }
+    );
+
+    return induceRequest(url,
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-dest');
+        });
+  }, 'sec-fetch-dest - Not sent to non-trustworthy same-origin destination, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, ['httpOrigin'], { mime: 'application/javascript' }
+    );
+
+    return induceRequest(url,
+        {"type": "module"}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-dest');
+        });
+  }, 'sec-fetch-dest - Not sent to non-trustworthy same-origin destination, attributes: type=module');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, ['httpSameSite'], { mime: 'application/javascript' }
+    );
+
+    return induceRequest(url,
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-dest');
+        });
+  }, 'sec-fetch-dest - Not sent to non-trustworthy same-site destination, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, ['httpSameSite'], { mime: 'application/javascript' }
+    );
+
+    return induceRequest(url,
+        {"type": "module"}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-dest');
+        });
+  }, 'sec-fetch-dest - Not sent to non-trustworthy same-site destination, attributes: type=module');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, ['httpCrossSite'], { mime: 'application/javascript' }
+    );
+
+    return induceRequest(url,
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-dest');
+        });
+  }, 'sec-fetch-dest - Not sent to non-trustworthy cross-site destination, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, ['httpCrossSite'], { mime: 'application/javascript' }
+    );
+
+    return induceRequest(url,
+        {"type": "module"}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-dest');
+        });
+  }, 'sec-fetch-dest - Not sent to non-trustworthy cross-site destination, attributes: type=module');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, ['httpOrigin'], { mime: 'application/javascript' }
+    );
+
+    return induceRequest(url,
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user - Not sent to non-trustworthy same-origin destination, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, ['httpOrigin'], { mime: 'application/javascript' }
+    );
+
+    return induceRequest(url,
+        {"type": "module"}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user - Not sent to non-trustworthy same-origin destination, attributes: type=module');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, ['httpSameSite'], { mime: 'application/javascript' }
+    );
+
+    return induceRequest(url,
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user - Not sent to non-trustworthy same-site destination, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, ['httpSameSite'], { mime: 'application/javascript' }
+    );
+
+    return induceRequest(url,
+        {"type": "module"}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user - Not sent to non-trustworthy same-site destination, attributes: type=module');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, ['httpCrossSite'], { mime: 'application/javascript' }
+    );
+
+    return induceRequest(url,
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user - Not sent to non-trustworthy cross-site destination, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, ['httpCrossSite'], { mime: 'application/javascript' }
+    );
+
+    return induceRequest(url,
+        {"type": "module"}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user - Not sent to non-trustworthy cross-site destination, attributes: type=module');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, ['httpsOrigin', 'httpOrigin'], { mime: 'application/javascript' }
+    );
+
+    return induceRequest(url,
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        });
+  }, 'sec-fetch-site - HTTPS downgrade (header not sent), no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, ['httpsOrigin', 'httpOrigin'], { mime: 'application/javascript' }
+    );
+
+    return induceRequest(url,
+        {"type": "module"}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        });
+  }, 'sec-fetch-site - HTTPS downgrade (header not sent), attributes: type=module');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, ['httpOrigin', 'httpsOrigin'], { mime: 'application/javascript' }
+    );
+
+    return induceRequest(url,
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - HTTPS upgrade, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, ['httpOrigin', 'httpsOrigin'], { mime: 'application/javascript' }
+    );
+
+    return induceRequest(url,
+        {"type": "module"}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - HTTPS upgrade, attributes: type=module');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, ['httpsOrigin', 'httpOrigin', 'httpsOrigin'], { mime: 'application/javascript' }
+    );
+
+    return induceRequest(url,
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - HTTPS downgrade-upgrade, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, ['httpsOrigin', 'httpOrigin', 'httpsOrigin'], { mime: 'application/javascript' }
+    );
+
+    return induceRequest(url,
+        {"type": "module"}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - HTTPS downgrade-upgrade, attributes: type=module');
+  </script>
+</html>
diff --git a/test/wpt/tests/fetch/metadata/generated/element-video-poster.https.sub.html b/test/wpt/tests/fetch/metadata/generated/element-video-poster.https.sub.html
new file mode 100644
index 00000000000..5805b46bd0c
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/generated/element-video-poster.https.sub.html
@@ -0,0 +1,243 @@
+<!DOCTYPE html>
+<!--
+This test was procedurally generated. Please do not modify it directly.
+Sources:
+- fetch/metadata/tools/fetch-metadata.conf.yml
+- fetch/metadata/tools/templates/element-video-poster.sub.html
+-->
+<html lang="en">
+  <meta charset="utf-8">
+  <title>HTTP headers on request for HTML "video" element "poster"</title>
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  <script src="/fetch/metadata/resources/helper.sub.js"></script>
+  <body>
+  <script>
+  'use strict';
+
+  const params = {
+    body: `
+      <svg xmlns="http://www.w3.org/2000/svg" width="123" height="123">
+        <rect fill="lime" width="123" height="123"/>
+      </svg>
+    `,
+    mime: 'image/svg+xml'
+  };
+
+  function induceRequest(t, url) {
+    var video = document.createElement('video');
+    video.setAttribute('poster', url);
+    document.body.appendChild(video);
+
+    const poll = () => {
+      if (video.clientWidth === 123) {
+        return;
+      }
+
+      return new Promise((resolve) => t.step_timeout(resolve, 0))
+        .then(poll);
+    };
+    t.add_cleanup(() => video.remove());
+
+    return poll();
+  }
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(t, makeRequestURL(key, ['httpsOrigin'], params))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-origin']);
+      });
+  }, 'sec-fetch-site - Same origin');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(t, makeRequestURL(key, ['httpsCrossSite'], params))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+      });
+  }, 'sec-fetch-site - Cross-site');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(t, makeRequestURL(key, ['httpsSameSite'], params))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+      });
+  }, 'sec-fetch-site - Same site');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(t, makeRequestURL(key, ['httpsOrigin', 'httpsCrossSite', 'httpsOrigin'], params))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+      });
+  }, 'sec-fetch-site - Same-Origin -> Cross-Site -> Same-Origin redirect');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(t, makeRequestURL(key, ['httpsOrigin', 'httpsSameSite', 'httpsOrigin'], params))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+      });
+  }, 'sec-fetch-site - Same-Origin -> Same-Site -> Same-Origin redirect');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(t, makeRequestURL(key, ['httpsCrossSite', 'httpsOrigin'], params))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+      });
+  }, 'sec-fetch-site - Cross-Site -> Same Origin');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(t, makeRequestURL(key, ['httpsCrossSite', 'httpsSameSite'], params))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+      });
+  }, 'sec-fetch-site - Cross-Site -> Same-Site');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(t, makeRequestURL(key, ['httpsCrossSite', 'httpsCrossSite'], params))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+      });
+  }, 'sec-fetch-site - Cross-Site -> Cross-Site');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(t, makeRequestURL(key, ['httpsOrigin', 'httpsOrigin'], params))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-origin']);
+      });
+  }, 'sec-fetch-site - Same-Origin -> Same Origin');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(t, makeRequestURL(key, ['httpsOrigin', 'httpsSameSite'], params))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+      });
+  }, 'sec-fetch-site - Same-Origin -> Same-Site');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(t, makeRequestURL(key, ['httpsOrigin', 'httpsCrossSite'], params))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+      });
+  }, 'sec-fetch-site - Same-Origin -> Cross-Site');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(t, makeRequestURL(key, ['httpsSameSite', 'httpsOrigin'], params))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+      });
+  }, 'sec-fetch-site - Same-Site -> Same Origin');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(t, makeRequestURL(key, ['httpsSameSite', 'httpsSameSite'], params))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+      });
+  }, 'sec-fetch-site - Same-Site -> Same-Site');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(t, makeRequestURL(key, ['httpsSameSite', 'httpsCrossSite'], params))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+      });
+  }, 'sec-fetch-site - Same-Site -> Cross-Site');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(t, makeRequestURL(key, ['httpsOrigin', 'httpOrigin', 'httpsOrigin'], params))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+      });
+  }, 'sec-fetch-site - HTTPS downgrade-upgrade');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(t, makeRequestURL(key, [], params))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-mode');
+          assert_array_equals(headers['sec-fetch-mode'], ['no-cors']);
+      });
+  }, 'sec-fetch-mode');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(t, makeRequestURL(key, [], params))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-dest');
+          assert_array_equals(headers['sec-fetch-dest'], ['image']);
+      });
+  }, 'sec-fetch-dest');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(t, makeRequestURL(key, [], params))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+      });
+  }, 'sec-fetch-user');
+  </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/fetch/metadata/generated/element-video-poster.sub.html b/test/wpt/tests/fetch/metadata/generated/element-video-poster.sub.html
new file mode 100644
index 00000000000..e6cc5ee7e06
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/generated/element-video-poster.sub.html
@@ -0,0 +1,198 @@
+<!DOCTYPE html>
+<!--
+This test was procedurally generated. Please do not modify it directly.
+Sources:
+- fetch/metadata/tools/fetch-metadata.conf.yml
+- fetch/metadata/tools/templates/element-video-poster.sub.html
+-->
+<html lang="en">
+  <meta charset="utf-8">
+  <title>HTTP headers on request for HTML "video" element "poster"</title>
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  <script src="/fetch/metadata/resources/helper.sub.js"></script>
+  <body>
+  <script>
+  'use strict';
+
+  const params = {
+    body: `
+      <svg xmlns="http://www.w3.org/2000/svg" width="123" height="123">
+        <rect fill="lime" width="123" height="123"/>
+      </svg>
+    `,
+    mime: 'image/svg+xml'
+  };
+
+  function induceRequest(t, url) {
+    var video = document.createElement('video');
+    video.setAttribute('poster', url);
+    document.body.appendChild(video);
+
+    const poll = () => {
+      if (video.clientWidth === 123) {
+        return;
+      }
+
+      return new Promise((resolve) => t.step_timeout(resolve, 0))
+        .then(poll);
+    };
+    t.add_cleanup(() => video.remove());
+
+    return poll();
+  }
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(t, makeRequestURL(key, ['httpOrigin'], params))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+      });
+  }, 'sec-fetch-site - Not sent to non-trustworthy same-origin destination');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(t, makeRequestURL(key, ['httpSameSite'], params))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+      });
+  }, 'sec-fetch-site - Not sent to non-trustworthy same-site destination');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(t, makeRequestURL(key, ['httpCrossSite'], params))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+      });
+  }, 'sec-fetch-site - Not sent to non-trustworthy cross-site destination');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(t, makeRequestURL(key, ['httpOrigin'], params))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-mode');
+      });
+  }, 'sec-fetch-mode - Not sent to non-trustworthy same-origin destination');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(t, makeRequestURL(key, ['httpSameSite'], params))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-mode');
+      });
+  }, 'sec-fetch-mode - Not sent to non-trustworthy same-site destination');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(t, makeRequestURL(key, ['httpCrossSite'], params))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-mode');
+      });
+  }, 'sec-fetch-mode - Not sent to non-trustworthy cross-site destination');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(t, makeRequestURL(key, ['httpOrigin'], params))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-dest');
+      });
+  }, 'sec-fetch-dest - Not sent to non-trustworthy same-origin destination');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(t, makeRequestURL(key, ['httpSameSite'], params))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-dest');
+      });
+  }, 'sec-fetch-dest - Not sent to non-trustworthy same-site destination');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(t, makeRequestURL(key, ['httpCrossSite'], params))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-dest');
+      });
+  }, 'sec-fetch-dest - Not sent to non-trustworthy cross-site destination');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(t, makeRequestURL(key, ['httpOrigin'], params))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+      });
+  }, 'sec-fetch-user - Not sent to non-trustworthy same-origin destination');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(t, makeRequestURL(key, ['httpSameSite'], params))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+      });
+  }, 'sec-fetch-user - Not sent to non-trustworthy same-site destination');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(t, makeRequestURL(key, ['httpCrossSite'], params))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+      });
+  }, 'sec-fetch-user - Not sent to non-trustworthy cross-site destination');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(t, makeRequestURL(key, ['httpsOrigin', 'httpOrigin'], params))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+      });
+  }, 'sec-fetch-site - HTTPS downgrade (header not sent)');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(t, makeRequestURL(key, ['httpOrigin', 'httpsOrigin'], params))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+      });
+  }, 'sec-fetch-site - HTTPS upgrade');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(t, makeRequestURL(key, ['httpsOrigin', 'httpOrigin', 'httpsOrigin'], params))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+      });
+  }, 'sec-fetch-site - HTTPS downgrade-upgrade');
+  </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/fetch/metadata/generated/element-video.https.sub.html b/test/wpt/tests/fetch/metadata/generated/element-video.https.sub.html
new file mode 100644
index 00000000000..971360dceea
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/generated/element-video.https.sub.html
@@ -0,0 +1,325 @@
+<!DOCTYPE html>
+<!--
+This test was procedurally generated. Please do not modify it directly.
+Sources:
+- fetch/metadata/tools/fetch-metadata.conf.yml
+- fetch/metadata/tools/templates/element-video.sub.html
+-->
+<html lang="en">
+  <meta charset="utf-8">
+  <title>HTTP headers on request for HTML "video" element source</title>
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  <script src="/fetch/metadata/resources/helper.sub.js"></script>
+  <body>
+  <script>
+  'use strict';
+
+  function induceRequest(url, attributes) {
+    const video = document.createElement('video');
+
+    for (const [ name, value ] of Object.entries(attributes)) {
+      video.setAttribute(name, value);
+    }
+
+    return new Promise((resolve) => {
+        video.setAttribute('src', url);
+        video.onload = video.onerror = resolve;
+      });
+  }
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsOrigin']),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-origin']);
+        });
+  }, 'sec-fetch-site - Same origin, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsCrossSite']),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Cross-site, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsSameSite']),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - Same site, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsOrigin', 'httpsCrossSite', 'httpsOrigin']),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Same-Origin -> Cross-Site -> Same-Origin redirect, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsOrigin', 'httpsSameSite', 'httpsOrigin']),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - Same-Origin -> Same-Site -> Same-Origin redirect, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsCrossSite', 'httpsOrigin']),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Cross-Site -> Same Origin, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsCrossSite', 'httpsSameSite']),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Cross-Site -> Same-Site, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsCrossSite', 'httpsCrossSite']),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Cross-Site -> Cross-Site, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsOrigin', 'httpsOrigin']),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-origin']);
+        });
+  }, 'sec-fetch-site - Same-Origin -> Same Origin, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsOrigin', 'httpsSameSite']),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - Same-Origin -> Same-Site, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsOrigin', 'httpsCrossSite']),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Same-Origin -> Cross-Site, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsSameSite', 'httpsOrigin']),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - Same-Site -> Same Origin, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsSameSite', 'httpsSameSite']),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - Same-Site -> Same-Site, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsSameSite', 'httpsCrossSite']),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Same-Site -> Cross-Site, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsOrigin', 'httpOrigin', 'httpsOrigin']),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - HTTPS downgrade-upgrade, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, []),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-mode');
+          assert_array_equals(headers['sec-fetch-mode'], ['no-cors']);
+        });
+  }, 'sec-fetch-mode - no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, []),
+        {"crossorigin": ""}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-mode');
+          assert_array_equals(headers['sec-fetch-mode'], ['cors']);
+        });
+  }, 'sec-fetch-mode - attributes: crossorigin');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, []),
+        {"crossorigin": "anonymous"}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-mode');
+          assert_array_equals(headers['sec-fetch-mode'], ['cors']);
+        });
+  }, 'sec-fetch-mode - attributes: crossorigin=anonymous');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, []),
+        {"crossorigin": "use-credentials"}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-mode');
+          assert_array_equals(headers['sec-fetch-mode'], ['cors']);
+        });
+  }, 'sec-fetch-mode - attributes: crossorigin=use-credentials');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, []),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-dest');
+          assert_array_equals(headers['sec-fetch-dest'], ['video']);
+        });
+  }, 'sec-fetch-dest - no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, []),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user - no attributes');
+  </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/fetch/metadata/generated/element-video.sub.html b/test/wpt/tests/fetch/metadata/generated/element-video.sub.html
new file mode 100644
index 00000000000..9707413ab68
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/generated/element-video.sub.html
@@ -0,0 +1,229 @@
+<!DOCTYPE html>
+<!--
+This test was procedurally generated. Please do not modify it directly.
+Sources:
+- fetch/metadata/tools/fetch-metadata.conf.yml
+- fetch/metadata/tools/templates/element-video.sub.html
+-->
+<html lang="en">
+  <meta charset="utf-8">
+  <title>HTTP headers on request for HTML "video" element source</title>
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  <script src="/fetch/metadata/resources/helper.sub.js"></script>
+  <body>
+  <script>
+  'use strict';
+
+  function induceRequest(url, attributes) {
+    const video = document.createElement('video');
+
+    for (const [ name, value ] of Object.entries(attributes)) {
+      video.setAttribute(name, value);
+    }
+
+    return new Promise((resolve) => {
+        video.setAttribute('src', url);
+        video.onload = video.onerror = resolve;
+      });
+  }
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpOrigin']),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        });
+  }, 'sec-fetch-site - Not sent to non-trustworthy same-origin destination, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpSameSite']),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        });
+  }, 'sec-fetch-site - Not sent to non-trustworthy same-site destination, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpCrossSite']),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        });
+  }, 'sec-fetch-site - Not sent to non-trustworthy cross-site destination, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpOrigin']),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-mode');
+        });
+  }, 'sec-fetch-mode - Not sent to non-trustworthy same-origin destination, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpSameSite']),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-mode');
+        });
+  }, 'sec-fetch-mode - Not sent to non-trustworthy same-site destination, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpCrossSite']),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-mode');
+        });
+  }, 'sec-fetch-mode - Not sent to non-trustworthy cross-site destination, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpOrigin']),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-dest');
+        });
+  }, 'sec-fetch-dest - Not sent to non-trustworthy same-origin destination, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpSameSite']),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-dest');
+        });
+  }, 'sec-fetch-dest - Not sent to non-trustworthy same-site destination, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpCrossSite']),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-dest');
+        });
+  }, 'sec-fetch-dest - Not sent to non-trustworthy cross-site destination, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpOrigin']),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user - Not sent to non-trustworthy same-origin destination, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpSameSite']),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user - Not sent to non-trustworthy same-site destination, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpCrossSite']),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user - Not sent to non-trustworthy cross-site destination, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsOrigin', 'httpOrigin']),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        });
+  }, 'sec-fetch-site - HTTPS downgrade (header not sent), no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpOrigin', 'httpsOrigin']),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - HTTPS upgrade, no attributes');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsOrigin', 'httpOrigin', 'httpsOrigin']),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - HTTPS downgrade-upgrade, no attributes');
+  </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/fetch/metadata/generated/fetch-via-serviceworker.https.sub.html b/test/wpt/tests/fetch/metadata/generated/fetch-via-serviceworker.https.sub.html
new file mode 100644
index 00000000000..22f930960d6
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/generated/fetch-via-serviceworker.https.sub.html
@@ -0,0 +1,683 @@
+<!DOCTYPE html>
+<!--
+This test was procedurally generated. Please do not modify it directly.
+Sources:
+- fetch/metadata/tools/fetch-metadata.conf.yml
+- fetch/metadata/tools/templates/fetch-via-serviceworker.https.sub.html
+-->
+<html lang="en">
+  <meta charset="utf-8">
+  <meta name="timeout" content="long">
+  <title>HTTP headers on request using the "fetch" API and passing through a Serive Worker</title>
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  <script src="/service-workers/service-worker/resources/test-helpers.sub.js"></script>
+  <script src="/fetch/metadata/resources/helper.sub.js"></script>
+  <body>
+  <script>
+  'use strict';
+
+  const scripts = {
+    fallback: '/fetch/metadata/resources/fetch-via-serviceworker--fallback--sw.js',
+    respondWith: '/fetch/metadata/resources/fetch-via-serviceworker--respondWith--sw.js'
+  };
+
+  function induceRequest(t, url, init, script) {
+    const SCOPE = '/fetch/metadata/resources/fetch-via-serviceworker-frame.html';
+    const SCRIPT = scripts[script];
+
+    return service_worker_unregister_and_register(t, SCRIPT, SCOPE)
+      .then((registration) => {
+        t.add_cleanup(() => registration.unregister());
+
+        return wait_for_state(t, registration.installing, 'activated');
+      })
+      .then(() => with_iframe(SCOPE))
+      .then((frame) => {
+        t.add_cleanup(() => frame.remove());
+
+        return frame.contentWindow.fetch(url, init);
+      });
+  }
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        t,
+        makeRequestURL(key, ['httpsOrigin']),
+        {"mode": "no-cors"},
+        'respondWith'
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-origin']);
+        });
+  }, 'sec-fetch-site - Same origin, init: mode=no-cors - respondWith');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        t,
+        makeRequestURL(key, ['httpsOrigin']),
+        {"mode": "no-cors"},
+        'fallback'
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-origin']);
+        });
+  }, 'sec-fetch-site - Same origin, init: mode=no-cors - fallback');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        t,
+        makeRequestURL(key, ['httpsCrossSite']),
+        {"mode": "no-cors"},
+        'respondWith'
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Cross-site, init: mode=no-cors - respondWith');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        t,
+        makeRequestURL(key, ['httpsCrossSite']),
+        {"mode": "no-cors"},
+        'fallback'
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Cross-site, init: mode=no-cors - fallback');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        t,
+        makeRequestURL(key, ['httpsSameSite']),
+        {"mode": "no-cors"},
+        'respondWith'
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - Same site, init: mode=no-cors - respondWith');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        t,
+        makeRequestURL(key, ['httpsSameSite']),
+        {"mode": "no-cors"},
+        'fallback'
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - Same site, init: mode=no-cors - fallback');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        t,
+        makeRequestURL(key, ['httpsOrigin', 'httpsCrossSite', 'httpsOrigin']),
+        {"mode": "no-cors"},
+        'respondWith'
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Same-Origin -> Cross-Site -> Same-Origin redirect, init: mode=no-cors - respondWith');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        t,
+        makeRequestURL(key, ['httpsOrigin', 'httpsCrossSite', 'httpsOrigin']),
+        {"mode": "no-cors"},
+        'fallback'
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Same-Origin -> Cross-Site -> Same-Origin redirect, init: mode=no-cors - fallback');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        t,
+        makeRequestURL(key, ['httpsOrigin', 'httpsSameSite', 'httpsOrigin']),
+        {"mode": "no-cors"},
+        'respondWith'
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - Same-Origin -> Same-Site -> Same-Origin redirect, init: mode=no-cors - respondWith');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        t,
+        makeRequestURL(key, ['httpsOrigin', 'httpsSameSite', 'httpsOrigin']),
+        {"mode": "no-cors"},
+        'fallback'
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - Same-Origin -> Same-Site -> Same-Origin redirect, init: mode=no-cors - fallback');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        t,
+        makeRequestURL(key, ['httpsCrossSite', 'httpsOrigin']),
+        {"mode": "no-cors"},
+        'respondWith'
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Cross-Site -> Same Origin, init: mode=no-cors - respondWith');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        t,
+        makeRequestURL(key, ['httpsCrossSite', 'httpsOrigin']),
+        {"mode": "no-cors"},
+        'fallback'
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Cross-Site -> Same Origin, init: mode=no-cors - fallback');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        t,
+        makeRequestURL(key, ['httpsCrossSite', 'httpsSameSite']),
+        {"mode": "no-cors"},
+        'respondWith'
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Cross-Site -> Same-Site, init: mode=no-cors - respondWith');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        t,
+        makeRequestURL(key, ['httpsCrossSite', 'httpsSameSite']),
+        {"mode": "no-cors"},
+        'fallback'
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Cross-Site -> Same-Site, init: mode=no-cors - fallback');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        t,
+        makeRequestURL(key, ['httpsCrossSite', 'httpsCrossSite']),
+        {"mode": "no-cors"},
+        'respondWith'
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Cross-Site -> Cross-Site, init: mode=no-cors - respondWith');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        t,
+        makeRequestURL(key, ['httpsCrossSite', 'httpsCrossSite']),
+        {"mode": "no-cors"},
+        'fallback'
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Cross-Site -> Cross-Site, init: mode=no-cors - fallback');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        t,
+        makeRequestURL(key, ['httpsOrigin', 'httpsOrigin']),
+        {"mode": "no-cors"},
+        'respondWith'
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-origin']);
+        });
+  }, 'sec-fetch-site - Same-Origin -> Same Origin, init: mode=no-cors - respondWith');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        t,
+        makeRequestURL(key, ['httpsOrigin', 'httpsOrigin']),
+        {"mode": "no-cors"},
+        'fallback'
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-origin']);
+        });
+  }, 'sec-fetch-site - Same-Origin -> Same Origin, init: mode=no-cors - fallback');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        t,
+        makeRequestURL(key, ['httpsOrigin', 'httpsSameSite']),
+        {"mode": "no-cors"},
+        'respondWith'
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - Same-Origin -> Same-Site, init: mode=no-cors - respondWith');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        t,
+        makeRequestURL(key, ['httpsOrigin', 'httpsSameSite']),
+        {"mode": "no-cors"},
+        'fallback'
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - Same-Origin -> Same-Site, init: mode=no-cors - fallback');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        t,
+        makeRequestURL(key, ['httpsOrigin', 'httpsCrossSite']),
+        {"mode": "no-cors"},
+        'respondWith'
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Same-Origin -> Cross-Site, init: mode=no-cors - respondWith');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        t,
+        makeRequestURL(key, ['httpsOrigin', 'httpsCrossSite']),
+        {"mode": "no-cors"},
+        'fallback'
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Same-Origin -> Cross-Site, init: mode=no-cors - fallback');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        t,
+        makeRequestURL(key, ['httpsSameSite', 'httpsOrigin']),
+        {"mode": "no-cors"},
+        'respondWith'
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - Same-Site -> Same Origin, init: mode=no-cors - respondWith');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        t,
+        makeRequestURL(key, ['httpsSameSite', 'httpsOrigin']),
+        {"mode": "no-cors"},
+        'fallback'
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - Same-Site -> Same Origin, init: mode=no-cors - fallback');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        t,
+        makeRequestURL(key, ['httpsSameSite', 'httpsSameSite']),
+        {"mode": "no-cors"},
+        'respondWith'
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - Same-Site -> Same-Site, init: mode=no-cors - respondWith');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        t,
+        makeRequestURL(key, ['httpsSameSite', 'httpsSameSite']),
+        {"mode": "no-cors"},
+        'fallback'
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - Same-Site -> Same-Site, init: mode=no-cors - fallback');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        t,
+        makeRequestURL(key, ['httpsSameSite', 'httpsCrossSite']),
+        {"mode": "no-cors"},
+        'respondWith'
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Same-Site -> Cross-Site, init: mode=no-cors - respondWith');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        t,
+        makeRequestURL(key, ['httpsSameSite', 'httpsCrossSite']),
+        {"mode": "no-cors"},
+        'fallback'
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Same-Site -> Cross-Site, init: mode=no-cors - fallback');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        t,
+        makeRequestURL(key, []),
+        {},
+        'respondWith'
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-mode');
+          assert_array_equals(headers['sec-fetch-mode'], ['cors']);
+        });
+  }, 'sec-fetch-mode - no init - respondWith');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        t,
+        makeRequestURL(key, []),
+        {},
+        'fallback'
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-mode');
+          assert_array_equals(headers['sec-fetch-mode'], ['cors']);
+        });
+  }, 'sec-fetch-mode - no init - fallback');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        t,
+        makeRequestURL(key, []),
+        {"mode": "cors"},
+        'respondWith'
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-mode');
+          assert_array_equals(headers['sec-fetch-mode'], ['cors']);
+        });
+  }, 'sec-fetch-mode - init: mode=cors - respondWith');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        t,
+        makeRequestURL(key, []),
+        {"mode": "cors"},
+        'fallback'
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-mode');
+          assert_array_equals(headers['sec-fetch-mode'], ['cors']);
+        });
+  }, 'sec-fetch-mode - init: mode=cors - fallback');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        t,
+        makeRequestURL(key, []),
+        {"mode": "no-cors"},
+        'respondWith'
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-mode');
+          assert_array_equals(headers['sec-fetch-mode'], ['no-cors']);
+        });
+  }, 'sec-fetch-mode - init: mode=no-cors - respondWith');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        t,
+        makeRequestURL(key, []),
+        {"mode": "no-cors"},
+        'fallback'
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-mode');
+          assert_array_equals(headers['sec-fetch-mode'], ['no-cors']);
+        });
+  }, 'sec-fetch-mode - init: mode=no-cors - fallback');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        t,
+        makeRequestURL(key, []),
+        {"mode": "same-origin"},
+        'respondWith'
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-mode');
+          assert_array_equals(headers['sec-fetch-mode'], ['same-origin']);
+        });
+  }, 'sec-fetch-mode - init: mode=same-origin - respondWith');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        t,
+        makeRequestURL(key, []),
+        {"mode": "same-origin"},
+        'fallback'
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-mode');
+          assert_array_equals(headers['sec-fetch-mode'], ['same-origin']);
+        });
+  }, 'sec-fetch-mode - init: mode=same-origin - fallback');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        t,
+        makeRequestURL(key, []),
+        {},
+        'respondWith'
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-dest');
+          assert_array_equals(headers['sec-fetch-dest'], ['empty']);
+        });
+  }, 'sec-fetch-dest - no init - respondWith');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        t,
+        makeRequestURL(key, []),
+        {},
+        'fallback'
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-dest');
+          assert_array_equals(headers['sec-fetch-dest'], ['empty']);
+        });
+  }, 'sec-fetch-dest - no init - fallback');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        t,
+        makeRequestURL(key, []),
+        {},
+        'respondWith'
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user - no init - respondWith');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        t,
+        makeRequestURL(key, []),
+        {},
+        'fallback'
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user - no init - fallback');
+
+  </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/fetch/metadata/generated/fetch.https.sub.html b/test/wpt/tests/fetch/metadata/generated/fetch.https.sub.html
new file mode 100644
index 00000000000..dde1daede4e
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/generated/fetch.https.sub.html
@@ -0,0 +1,302 @@
+<!DOCTYPE html>
+<!--
+This test was procedurally generated. Please do not modify it directly.
+Sources:
+- fetch/metadata/tools/fetch-metadata.conf.yml
+- fetch/metadata/tools/templates/fetch.sub.html
+-->
+<html lang="en">
+  <meta charset="utf-8">
+  <title>HTTP headers on request using the "fetch" API</title>
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  <script src="/fetch/metadata/resources/helper.sub.js"></script>
+  <body>
+  <script>
+  'use strict';
+
+  function induceRequest(url, init) {
+    return fetch(url, init);
+  }
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsOrigin']),
+        {"mode": "no-cors"}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-origin']);
+        });
+  }, 'sec-fetch-site - Same origin, init: mode=no-cors');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsCrossSite']),
+        {"mode": "no-cors"}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Cross-site, init: mode=no-cors');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsSameSite']),
+        {"mode": "no-cors"}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - Same site, init: mode=no-cors');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsOrigin', 'httpsCrossSite', 'httpsOrigin']),
+        {"mode": "no-cors"}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Same-Origin -> Cross-Site -> Same-Origin redirect, init: mode=no-cors');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsOrigin', 'httpsSameSite', 'httpsOrigin']),
+        {"mode": "no-cors"}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - Same-Origin -> Same-Site -> Same-Origin redirect, init: mode=no-cors');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsCrossSite', 'httpsOrigin']),
+        {"mode": "no-cors"}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Cross-Site -> Same Origin, init: mode=no-cors');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsCrossSite', 'httpsSameSite']),
+        {"mode": "no-cors"}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Cross-Site -> Same-Site, init: mode=no-cors');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsCrossSite', 'httpsCrossSite']),
+        {"mode": "no-cors"}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Cross-Site -> Cross-Site, init: mode=no-cors');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsOrigin', 'httpsOrigin']),
+        {"mode": "no-cors"}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-origin']);
+        });
+  }, 'sec-fetch-site - Same-Origin -> Same Origin, init: mode=no-cors');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsOrigin', 'httpsSameSite']),
+        {"mode": "no-cors"}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - Same-Origin -> Same-Site, init: mode=no-cors');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsOrigin', 'httpsCrossSite']),
+        {"mode": "no-cors"}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Same-Origin -> Cross-Site, init: mode=no-cors');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsSameSite', 'httpsOrigin']),
+        {"mode": "no-cors"}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - Same-Site -> Same Origin, init: mode=no-cors');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsSameSite', 'httpsSameSite']),
+        {"mode": "no-cors"}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - Same-Site -> Same-Site, init: mode=no-cors');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsSameSite', 'httpsCrossSite']),
+        {"mode": "no-cors"}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Same-Site -> Cross-Site, init: mode=no-cors');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, []),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-mode');
+          assert_array_equals(headers['sec-fetch-mode'], ['cors']);
+        });
+  }, 'sec-fetch-mode - no init');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, []),
+        {"mode": "cors"}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-mode');
+          assert_array_equals(headers['sec-fetch-mode'], ['cors']);
+        });
+  }, 'sec-fetch-mode - init: mode=cors');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, []),
+        {"mode": "no-cors"}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-mode');
+          assert_array_equals(headers['sec-fetch-mode'], ['no-cors']);
+        });
+  }, 'sec-fetch-mode - init: mode=no-cors');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, []),
+        {"mode": "same-origin"}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-mode');
+          assert_array_equals(headers['sec-fetch-mode'], ['same-origin']);
+        });
+  }, 'sec-fetch-mode - init: mode=same-origin');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, []),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-dest');
+          assert_array_equals(headers['sec-fetch-dest'], ['empty']);
+        });
+  }, 'sec-fetch-dest - no init');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, []),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user - no init');
+  </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/fetch/metadata/generated/fetch.sub.html b/test/wpt/tests/fetch/metadata/generated/fetch.sub.html
new file mode 100644
index 00000000000..d28ea9bb900
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/generated/fetch.sub.html
@@ -0,0 +1,220 @@
+<!DOCTYPE html>
+<!--
+This test was procedurally generated. Please do not modify it directly.
+Sources:
+- fetch/metadata/tools/fetch-metadata.conf.yml
+- fetch/metadata/tools/templates/fetch.sub.html
+-->
+<html lang="en">
+  <meta charset="utf-8">
+  <title>HTTP headers on request using the "fetch" API</title>
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  <script src="/fetch/metadata/resources/helper.sub.js"></script>
+  <body>
+  <script>
+  'use strict';
+
+  function induceRequest(url, init) {
+    return fetch(url, init);
+  }
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpOrigin']),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        });
+  }, 'sec-fetch-site - Not sent to non-trustworthy same-origin destination, no init');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpSameSite']),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        });
+  }, 'sec-fetch-site - Not sent to non-trustworthy same-site destination, no init');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpCrossSite']),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        });
+  }, 'sec-fetch-site - Not sent to non-trustworthy cross-site destination, no init');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpOrigin']),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-mode');
+        });
+  }, 'sec-fetch-mode - Not sent to non-trustworthy same-origin destination, no init');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpSameSite']),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-mode');
+        });
+  }, 'sec-fetch-mode - Not sent to non-trustworthy same-site destination, no init');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpCrossSite']),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-mode');
+        });
+  }, 'sec-fetch-mode - Not sent to non-trustworthy cross-site destination, no init');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpOrigin']),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-dest');
+        });
+  }, 'sec-fetch-dest - Not sent to non-trustworthy same-origin destination, no init');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpSameSite']),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-dest');
+        });
+  }, 'sec-fetch-dest - Not sent to non-trustworthy same-site destination, no init');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpCrossSite']),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-dest');
+        });
+  }, 'sec-fetch-dest - Not sent to non-trustworthy cross-site destination, no init');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpOrigin']),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user - Not sent to non-trustworthy same-origin destination, no init');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpSameSite']),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user - Not sent to non-trustworthy same-site destination, no init');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpCrossSite']),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user - Not sent to non-trustworthy cross-site destination, no init');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsOrigin', 'httpOrigin']),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        });
+  }, 'sec-fetch-site - HTTPS downgrade (header not sent), no init');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpOrigin', 'httpsOrigin']),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - HTTPS upgrade, no init');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsOrigin', 'httpOrigin', 'httpsOrigin']),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - HTTPS downgrade-upgrade, no init');
+  </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/fetch/metadata/generated/form-submission.https.sub.html b/test/wpt/tests/fetch/metadata/generated/form-submission.https.sub.html
new file mode 100644
index 00000000000..988b07c74a9
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/generated/form-submission.https.sub.html
@@ -0,0 +1,522 @@
+<!DOCTYPE html>
+<!--
+This test was procedurally generated. Please do not modify it directly.
+Sources:
+- fetch/metadata/tools/fetch-metadata.conf.yml
+- fetch/metadata/tools/templates/form-submission.sub.html
+-->
+<html lang="en">
+  <meta charset="utf-8">
+  <meta name="timeout" content="long">
+  <title>HTTP headers on request for HTML form navigation</title>
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  <script src="/resources/testdriver.js"></script>
+  <script src="/resources/testdriver-vendor.js"></script>
+  <script src="/fetch/metadata/resources/helper.sub.js"></script>
+  <body>
+  <script>
+  'use strict';
+
+  function induceRequest(method, url, userActivated) {
+    const windowName = String(Math.random());
+    const form = document.createElement('form');
+    const submit = document.createElement('input');
+    submit.setAttribute('type', 'submit');
+    form.appendChild(submit);
+    const win = open('about:blank', windowName);
+    form.setAttribute('method', method);
+    form.setAttribute('action', url);
+    form.setAttribute('target', windowName);
+    document.body.appendChild(form);
+
+    // Query parameters must be expressed as form values so that they are sent
+    // with the submission of forms whose method is POST.
+    Array.from(new URL(url, location.origin).searchParams)
+      .forEach(([name, value]) => {
+        const input = document.createElement('input');
+        input.setAttribute('type', 'hidden');
+        input.setAttribute('name', name);
+        input.setAttribute('value', value);
+        form.appendChild(input);
+      });
+
+    return new Promise((resolve) => {
+        addEventListener('message', function(event) {
+          if (event.source === win) {
+            resolve();
+          }
+        });
+
+        if (userActivated) {
+          test_driver.click(submit);
+        } else {
+          submit.click();
+        }
+      })
+      .then(() => {
+        form.remove();
+        win.close();
+      });
+  }
+  const responseParams = {
+    mime: 'text/html',
+    body: `<script>opener.postMessage('done', '*')</${''}script>`
+  };
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsOrigin'], responseParams);
+    const userActivated = false;
+    return induceRequest('GET', url, userActivated)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-origin']);
+        });
+  }, 'sec-fetch-site - Same origin - GET');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsOrigin'], responseParams);
+    const userActivated = false;
+    return induceRequest('POST', url, userActivated)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-origin']);
+        });
+  }, 'sec-fetch-site - Same origin - POST');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsCrossSite'], responseParams);
+    const userActivated = false;
+    return induceRequest('GET', url, userActivated)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Cross-site - GET');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsCrossSite'], responseParams);
+    const userActivated = false;
+    return induceRequest('POST', url, userActivated)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Cross-site - POST');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsSameSite'], responseParams);
+    const userActivated = false;
+    return induceRequest('GET', url, userActivated)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - Same site - GET');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsSameSite'], responseParams);
+    const userActivated = false;
+    return induceRequest('POST', url, userActivated)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - Same site - POST');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsOrigin', 'httpsCrossSite', 'httpsOrigin'], responseParams);
+    const userActivated = false;
+    return induceRequest('GET', url, userActivated)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Same-Origin -> Cross-Site -> Same-Origin redirect - GET');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsOrigin', 'httpsCrossSite', 'httpsOrigin'], responseParams);
+    const userActivated = false;
+    return induceRequest('POST', url, userActivated)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Same-Origin -> Cross-Site -> Same-Origin redirect - POST');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsOrigin', 'httpsSameSite', 'httpsOrigin'], responseParams);
+    const userActivated = false;
+    return induceRequest('GET', url, userActivated)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - Same-Origin -> Same-Site -> Same-Origin redirect - GET');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsOrigin', 'httpsSameSite', 'httpsOrigin'], responseParams);
+    const userActivated = false;
+    return induceRequest('POST', url, userActivated)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - Same-Origin -> Same-Site -> Same-Origin redirect - POST');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsCrossSite', 'httpsOrigin'], responseParams);
+    const userActivated = false;
+    return induceRequest('GET', url, userActivated)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Cross-Site -> Same Origin - GET');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsCrossSite', 'httpsOrigin'], responseParams);
+    const userActivated = false;
+    return induceRequest('POST', url, userActivated)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Cross-Site -> Same Origin - POST');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsCrossSite', 'httpsSameSite'], responseParams);
+    const userActivated = false;
+    return induceRequest('GET', url, userActivated)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Cross-Site -> Same-Site - GET');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsCrossSite', 'httpsSameSite'], responseParams);
+    const userActivated = false;
+    return induceRequest('POST', url, userActivated)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Cross-Site -> Same-Site - POST');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsCrossSite', 'httpsCrossSite'], responseParams);
+    const userActivated = false;
+    return induceRequest('GET', url, userActivated)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Cross-Site -> Cross-Site - GET');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsCrossSite', 'httpsCrossSite'], responseParams);
+    const userActivated = false;
+    return induceRequest('POST', url, userActivated)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Cross-Site -> Cross-Site - POST');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsOrigin', 'httpsOrigin'], responseParams);
+    const userActivated = false;
+    return induceRequest('GET', url, userActivated)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-origin']);
+        });
+  }, 'sec-fetch-site - Same-Origin -> Same Origin - GET');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsOrigin', 'httpsOrigin'], responseParams);
+    const userActivated = false;
+    return induceRequest('POST', url, userActivated)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-origin']);
+        });
+  }, 'sec-fetch-site - Same-Origin -> Same Origin - POST');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsOrigin', 'httpsSameSite'], responseParams);
+    const userActivated = false;
+    return induceRequest('GET', url, userActivated)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - Same-Origin -> Same-Site - GET');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsOrigin', 'httpsSameSite'], responseParams);
+    const userActivated = false;
+    return induceRequest('POST', url, userActivated)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - Same-Origin -> Same-Site - POST');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsOrigin', 'httpsCrossSite'], responseParams);
+    const userActivated = false;
+    return induceRequest('GET', url, userActivated)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Same-Origin -> Cross-Site - GET');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsOrigin', 'httpsCrossSite'], responseParams);
+    const userActivated = false;
+    return induceRequest('POST', url, userActivated)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Same-Origin -> Cross-Site - POST');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsSameSite', 'httpsOrigin'], responseParams);
+    const userActivated = false;
+    return induceRequest('GET', url, userActivated)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - Same-Site -> Same Origin - GET');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsSameSite', 'httpsOrigin'], responseParams);
+    const userActivated = false;
+    return induceRequest('POST', url, userActivated)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - Same-Site -> Same Origin - POST');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsSameSite', 'httpsSameSite'], responseParams);
+    const userActivated = false;
+    return induceRequest('GET', url, userActivated)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - Same-Site -> Same-Site - GET');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsSameSite', 'httpsSameSite'], responseParams);
+    const userActivated = false;
+    return induceRequest('POST', url, userActivated)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - Same-Site -> Same-Site - POST');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsSameSite', 'httpsCrossSite'], responseParams);
+    const userActivated = false;
+    return induceRequest('GET', url, userActivated)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Same-Site -> Cross-Site - GET');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsSameSite', 'httpsCrossSite'], responseParams);
+    const userActivated = false;
+    return induceRequest('POST', url, userActivated)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Same-Site -> Cross-Site - POST');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsOrigin', 'httpOrigin', 'httpsOrigin'], responseParams);
+    const userActivated = false;
+    return induceRequest('GET', url, userActivated)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - HTTPS downgrade-upgrade - GET');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsOrigin', 'httpOrigin', 'httpsOrigin'], responseParams);
+    const userActivated = false;
+    return induceRequest('POST', url, userActivated)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - HTTPS downgrade-upgrade - POST');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, [], responseParams);
+    const userActivated = false;
+    return induceRequest('GET', url, userActivated)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-mode');
+          assert_array_equals(headers['sec-fetch-mode'], ['navigate']);
+        });
+  }, 'sec-fetch-mode - GET');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, [], responseParams);
+    const userActivated = false;
+    return induceRequest('POST', url, userActivated)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-mode');
+          assert_array_equals(headers['sec-fetch-mode'], ['navigate']);
+        });
+  }, 'sec-fetch-mode - POST');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, [], responseParams);
+    const userActivated = false;
+    return induceRequest('GET', url, userActivated)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-dest');
+          assert_array_equals(headers['sec-fetch-dest'], ['document']);
+        });
+  }, 'sec-fetch-dest - GET');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, [], responseParams);
+    const userActivated = false;
+    return induceRequest('POST', url, userActivated)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-dest');
+          assert_array_equals(headers['sec-fetch-dest'], ['document']);
+        });
+  }, 'sec-fetch-dest - POST');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, [], responseParams);
+    const userActivated = false;
+    return induceRequest('GET', url, userActivated)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user - GET');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, [], responseParams);
+    const userActivated = true;
+    return induceRequest('GET', url, userActivated)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-user');
+          assert_array_equals(headers['sec-fetch-user'], ['?1']);
+        });
+  }, 'sec-fetch-user - GET with user activation');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, [], responseParams);
+    const userActivated = false;
+    return induceRequest('POST', url, userActivated)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user - POST');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, [], responseParams);
+    const userActivated = true;
+    return induceRequest('POST', url, userActivated)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-user');
+          assert_array_equals(headers['sec-fetch-user'], ['?1']);
+        });
+  }, 'sec-fetch-user - POST with user activation');
+  </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/fetch/metadata/generated/form-submission.sub.html b/test/wpt/tests/fetch/metadata/generated/form-submission.sub.html
new file mode 100644
index 00000000000..f862062aebc
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/generated/form-submission.sub.html
@@ -0,0 +1,400 @@
+<!DOCTYPE html>
+<!--
+This test was procedurally generated. Please do not modify it directly.
+Sources:
+- fetch/metadata/tools/fetch-metadata.conf.yml
+- fetch/metadata/tools/templates/form-submission.sub.html
+-->
+<html lang="en">
+  <meta charset="utf-8">
+  <meta name="timeout" content="long">
+  <title>HTTP headers on request for HTML form navigation</title>
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  <script src="/fetch/metadata/resources/helper.sub.js"></script>
+  <body>
+  <script>
+  'use strict';
+
+  function induceRequest(method, url, userActivated) {
+    const windowName = String(Math.random());
+    const form = document.createElement('form');
+    const submit = document.createElement('input');
+    submit.setAttribute('type', 'submit');
+    form.appendChild(submit);
+    const win = open('about:blank', windowName);
+    form.setAttribute('method', method);
+    form.setAttribute('action', url);
+    form.setAttribute('target', windowName);
+    document.body.appendChild(form);
+
+    // Query parameters must be expressed as form values so that they are sent
+    // with the submission of forms whose method is POST.
+    Array.from(new URL(url, location.origin).searchParams)
+      .forEach(([name, value]) => {
+        const input = document.createElement('input');
+        input.setAttribute('type', 'hidden');
+        input.setAttribute('name', name);
+        input.setAttribute('value', value);
+        form.appendChild(input);
+      });
+
+    return new Promise((resolve) => {
+        addEventListener('message', function(event) {
+          if (event.source === win) {
+            resolve();
+          }
+        });
+
+        if (userActivated) {
+          test_driver.click(submit);
+        } else {
+          submit.click();
+        }
+      })
+      .then(() => {
+        form.remove();
+        win.close();
+      });
+  }
+  const responseParams = {
+    mime: 'text/html',
+    body: `<script>opener.postMessage('done', '*')</${''}script>`
+  };
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpOrigin'], responseParams);
+    const userActivated = false;
+    return induceRequest('GET', url, userActivated)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        });
+  }, 'sec-fetch-site - Not sent to non-trustworthy same-origin destination - GET');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpOrigin'], responseParams);
+    const userActivated = false;
+    return induceRequest('POST', url, userActivated)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        });
+  }, 'sec-fetch-site - Not sent to non-trustworthy same-origin destination - POST');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpSameSite'], responseParams);
+    const userActivated = false;
+    return induceRequest('GET', url, userActivated)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        });
+  }, 'sec-fetch-site - Not sent to non-trustworthy same-site destination - GET');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpSameSite'], responseParams);
+    const userActivated = false;
+    return induceRequest('POST', url, userActivated)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        });
+  }, 'sec-fetch-site - Not sent to non-trustworthy same-site destination - POST');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpCrossSite'], responseParams);
+    const userActivated = false;
+    return induceRequest('GET', url, userActivated)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        });
+  }, 'sec-fetch-site - Not sent to non-trustworthy cross-site destination - GET');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpCrossSite'], responseParams);
+    const userActivated = false;
+    return induceRequest('POST', url, userActivated)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        });
+  }, 'sec-fetch-site - Not sent to non-trustworthy cross-site destination - POST');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpOrigin'], responseParams);
+    const userActivated = false;
+    return induceRequest('GET', url, userActivated)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-mode');
+        });
+  }, 'sec-fetch-mode - Not sent to non-trustworthy same-origin destination - GET');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpOrigin'], responseParams);
+    const userActivated = false;
+    return induceRequest('POST', url, userActivated)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-mode');
+        });
+  }, 'sec-fetch-mode - Not sent to non-trustworthy same-origin destination - POST');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpSameSite'], responseParams);
+    const userActivated = false;
+    return induceRequest('GET', url, userActivated)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-mode');
+        });
+  }, 'sec-fetch-mode - Not sent to non-trustworthy same-site destination - GET');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpSameSite'], responseParams);
+    const userActivated = false;
+    return induceRequest('POST', url, userActivated)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-mode');
+        });
+  }, 'sec-fetch-mode - Not sent to non-trustworthy same-site destination - POST');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpCrossSite'], responseParams);
+    const userActivated = false;
+    return induceRequest('GET', url, userActivated)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-mode');
+        });
+  }, 'sec-fetch-mode - Not sent to non-trustworthy cross-site destination - GET');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpCrossSite'], responseParams);
+    const userActivated = false;
+    return induceRequest('POST', url, userActivated)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-mode');
+        });
+  }, 'sec-fetch-mode - Not sent to non-trustworthy cross-site destination - POST');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpOrigin'], responseParams);
+    const userActivated = false;
+    return induceRequest('GET', url, userActivated)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-dest');
+        });
+  }, 'sec-fetch-dest - Not sent to non-trustworthy same-origin destination - GET');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpOrigin'], responseParams);
+    const userActivated = false;
+    return induceRequest('POST', url, userActivated)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-dest');
+        });
+  }, 'sec-fetch-dest - Not sent to non-trustworthy same-origin destination - POST');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpSameSite'], responseParams);
+    const userActivated = false;
+    return induceRequest('GET', url, userActivated)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-dest');
+        });
+  }, 'sec-fetch-dest - Not sent to non-trustworthy same-site destination - GET');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpSameSite'], responseParams);
+    const userActivated = false;
+    return induceRequest('POST', url, userActivated)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-dest');
+        });
+  }, 'sec-fetch-dest - Not sent to non-trustworthy same-site destination - POST');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpCrossSite'], responseParams);
+    const userActivated = false;
+    return induceRequest('GET', url, userActivated)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-dest');
+        });
+  }, 'sec-fetch-dest - Not sent to non-trustworthy cross-site destination - GET');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpCrossSite'], responseParams);
+    const userActivated = false;
+    return induceRequest('POST', url, userActivated)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-dest');
+        });
+  }, 'sec-fetch-dest - Not sent to non-trustworthy cross-site destination - POST');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpOrigin'], responseParams);
+    const userActivated = false;
+    return induceRequest('GET', url, userActivated)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user - Not sent to non-trustworthy same-origin destination - GET');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpOrigin'], responseParams);
+    const userActivated = false;
+    return induceRequest('POST', url, userActivated)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user - Not sent to non-trustworthy same-origin destination - POST');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpSameSite'], responseParams);
+    const userActivated = false;
+    return induceRequest('GET', url, userActivated)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user - Not sent to non-trustworthy same-site destination - GET');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpSameSite'], responseParams);
+    const userActivated = false;
+    return induceRequest('POST', url, userActivated)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user - Not sent to non-trustworthy same-site destination - POST');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpCrossSite'], responseParams);
+    const userActivated = false;
+    return induceRequest('GET', url, userActivated)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user - Not sent to non-trustworthy cross-site destination - GET');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpCrossSite'], responseParams);
+    const userActivated = false;
+    return induceRequest('POST', url, userActivated)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user - Not sent to non-trustworthy cross-site destination - POST');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsOrigin', 'httpOrigin'], responseParams);
+    const userActivated = false;
+    return induceRequest('GET', url, userActivated)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        });
+  }, 'sec-fetch-site - HTTPS downgrade (header not sent) - GET');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsOrigin', 'httpOrigin'], responseParams);
+    const userActivated = false;
+    return induceRequest('POST', url, userActivated)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        });
+  }, 'sec-fetch-site - HTTPS downgrade (header not sent) - POST');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpOrigin', 'httpsOrigin'], responseParams);
+    const userActivated = false;
+    return induceRequest('GET', url, userActivated)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - HTTPS upgrade - GET');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpOrigin', 'httpsOrigin'], responseParams);
+    const userActivated = false;
+    return induceRequest('POST', url, userActivated)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - HTTPS upgrade - POST');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsOrigin', 'httpOrigin', 'httpsOrigin'], responseParams);
+    const userActivated = false;
+    return induceRequest('GET', url, userActivated)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - HTTPS downgrade-upgrade - GET');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsOrigin', 'httpOrigin', 'httpsOrigin'], responseParams);
+    const userActivated = false;
+    return induceRequest('POST', url, userActivated)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - HTTPS downgrade-upgrade - POST');
+  </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/fetch/metadata/generated/header-link.https.sub.html b/test/wpt/tests/fetch/metadata/generated/header-link.https.sub.html
new file mode 100644
index 00000000000..09f01138955
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/generated/header-link.https.sub.html
@@ -0,0 +1,529 @@
+<!DOCTYPE html>
+<!--
+This test was procedurally generated. Please do not modify it directly.
+Sources:
+- fetch/metadata/tools/fetch-metadata.conf.yml
+- fetch/metadata/tools/templates/header-link.sub.html
+-->
+<html lang="en">
+  <meta charset="utf-8">
+  <title>HTTP headers on request for HTTP "Link" header</title>
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  <script src="/fetch/metadata/resources/helper.sub.js"></script>
+  <body>
+  <script>
+  'use strict';
+
+  function induceRequest(url, rel, test) {
+    const iframe = document.createElement('iframe');
+
+    iframe.setAttribute(
+      'src',
+      '/fetch/metadata/resources/header-link.py' +
+        `?location=${encodeURIComponent(url)}&rel=${rel}`
+    );
+
+    document.body.appendChild(iframe);
+    test.add_cleanup(() => iframe.remove());
+
+    return new Promise((resolve) => {
+        iframe.onload = iframe.onerror = resolve;
+      });
+  }
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsOrigin'], {mime: 'text/html'}),
+        'icon',
+        t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-origin']);
+        });
+  }, 'sec-fetch-site rel=icon - Same origin');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsOrigin'], {mime: 'text/html'}),
+        'stylesheet',
+        t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-origin']);
+        });
+  }, 'sec-fetch-site rel=stylesheet - Same origin');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsCrossSite'], {mime: 'text/html'}),
+        'icon',
+        t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site rel=icon - Cross-site');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsCrossSite'], {mime: 'text/html'}),
+        'stylesheet',
+        t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site rel=stylesheet - Cross-site');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsSameSite'], {mime: 'text/html'}),
+        'icon',
+        t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site rel=icon - Same site');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsSameSite'], {mime: 'text/html'}),
+        'stylesheet',
+        t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site rel=stylesheet - Same site');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsOrigin', 'httpsCrossSite', 'httpsOrigin'], {mime: 'text/html'}),
+        'icon',
+        t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site rel=icon - Same-Origin -> Cross-Site -> Same-Origin redirect');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsOrigin', 'httpsCrossSite', 'httpsOrigin'], {mime: 'text/html'}),
+        'stylesheet',
+        t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site rel=stylesheet - Same-Origin -> Cross-Site -> Same-Origin redirect');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsOrigin', 'httpsSameSite', 'httpsOrigin'], {mime: 'text/html'}),
+        'icon',
+        t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site rel=icon - Same-Origin -> Same-Site -> Same-Origin redirect');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsOrigin', 'httpsSameSite', 'httpsOrigin'], {mime: 'text/html'}),
+        'stylesheet',
+        t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site rel=stylesheet - Same-Origin -> Same-Site -> Same-Origin redirect');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsCrossSite', 'httpsOrigin'], {mime: 'text/html'}),
+        'icon',
+        t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site rel=icon - Cross-Site -> Same Origin');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsCrossSite', 'httpsOrigin'], {mime: 'text/html'}),
+        'stylesheet',
+        t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site rel=stylesheet - Cross-Site -> Same Origin');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsCrossSite', 'httpsSameSite'], {mime: 'text/html'}),
+        'icon',
+        t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site rel=icon - Cross-Site -> Same-Site');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsCrossSite', 'httpsSameSite'], {mime: 'text/html'}),
+        'stylesheet',
+        t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site rel=stylesheet - Cross-Site -> Same-Site');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsCrossSite', 'httpsCrossSite'], {mime: 'text/html'}),
+        'icon',
+        t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site rel=icon - Cross-Site -> Cross-Site');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsCrossSite', 'httpsCrossSite'], {mime: 'text/html'}),
+        'stylesheet',
+        t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site rel=stylesheet - Cross-Site -> Cross-Site');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsOrigin', 'httpsOrigin'], {mime: 'text/html'}),
+        'icon',
+        t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-origin']);
+        });
+  }, 'sec-fetch-site rel=icon - Same-Origin -> Same Origin');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsOrigin', 'httpsOrigin'], {mime: 'text/html'}),
+        'stylesheet',
+        t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-origin']);
+        });
+  }, 'sec-fetch-site rel=stylesheet - Same-Origin -> Same Origin');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsOrigin', 'httpsSameSite'], {mime: 'text/html'}),
+        'icon',
+        t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site rel=icon - Same-Origin -> Same-Site');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsOrigin', 'httpsSameSite'], {mime: 'text/html'}),
+        'stylesheet',
+        t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site rel=stylesheet - Same-Origin -> Same-Site');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsOrigin', 'httpsCrossSite'], {mime: 'text/html'}),
+        'icon',
+        t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site rel=icon - Same-Origin -> Cross-Site');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsOrigin', 'httpsCrossSite'], {mime: 'text/html'}),
+        'stylesheet',
+        t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site rel=stylesheet - Same-Origin -> Cross-Site');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsSameSite', 'httpsOrigin'], {mime: 'text/html'}),
+        'icon',
+        t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site rel=icon - Same-Site -> Same Origin');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsSameSite', 'httpsOrigin'], {mime: 'text/html'}),
+        'stylesheet',
+        t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site rel=stylesheet - Same-Site -> Same Origin');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsSameSite', 'httpsSameSite'], {mime: 'text/html'}),
+        'icon',
+        t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site rel=icon - Same-Site -> Same-Site');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsSameSite', 'httpsSameSite'], {mime: 'text/html'}),
+        'stylesheet',
+        t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site rel=stylesheet - Same-Site -> Same-Site');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsSameSite', 'httpsCrossSite'], {mime: 'text/html'}),
+        'icon',
+        t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site rel=icon - Same-Site -> Cross-Site');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsSameSite', 'httpsCrossSite'], {mime: 'text/html'}),
+        'stylesheet',
+        t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site rel=stylesheet - Same-Site -> Cross-Site');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, [], {mime: 'text/html'}),
+        'icon',
+        t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-mode');
+          assert_array_equals(headers['sec-fetch-mode'], ['no-cors']);
+        });
+  }, 'sec-fetch-mode rel=icon');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, [], {mime: 'text/html'}),
+        'stylesheet',
+        t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-mode');
+          assert_array_equals(headers['sec-fetch-mode'], ['no-cors']);
+        });
+  }, 'sec-fetch-mode rel=stylesheet');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, [], {mime: 'text/html'}),
+        'icon',
+        t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-dest');
+          assert_array_equals(headers['sec-fetch-dest'], ['empty']);
+        });
+  }, 'sec-fetch-dest rel=icon');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, [], {mime: 'text/html'}),
+        'icon',
+        t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user rel=icon');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, [], {mime: 'text/html'}),
+        'stylesheet',
+        t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user rel=stylesheet');
+  </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/fetch/metadata/generated/header-link.https.sub.tentative.html b/test/wpt/tests/fetch/metadata/generated/header-link.https.sub.tentative.html
new file mode 100644
index 00000000000..307c37fbf77
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/generated/header-link.https.sub.tentative.html
@@ -0,0 +1,51 @@
+<!DOCTYPE html>
+<!--
+This test was procedurally generated. Please do not modify it directly.
+Sources:
+- fetch/metadata/tools/fetch-metadata.conf.yml
+- fetch/metadata/tools/templates/header-link.sub.html
+-->
+<html lang="en">
+  <meta charset="utf-8">
+  <title>HTTP headers on request for HTTP "Link" header</title>
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  <script src="/fetch/metadata/resources/helper.sub.js"></script>
+  <body>
+  <script>
+  'use strict';
+
+  function induceRequest(url, rel, test) {
+    const iframe = document.createElement('iframe');
+
+    iframe.setAttribute(
+      'src',
+      '/fetch/metadata/resources/header-link.py' +
+        `?location=${encodeURIComponent(url)}&rel=${rel}`
+    );
+
+    document.body.appendChild(iframe);
+    test.add_cleanup(() => iframe.remove());
+
+    return new Promise((resolve) => {
+        iframe.onload = iframe.onerror = resolve;
+      });
+  }
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, [], {mime: 'text/html'}),
+        'stylesheet',
+        t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-dest');
+          assert_array_equals(headers['sec-fetch-dest'], ['style']);
+        });
+  }, 'sec-fetch-dest rel=stylesheet');
+  </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/fetch/metadata/generated/header-link.sub.html b/test/wpt/tests/fetch/metadata/generated/header-link.sub.html
new file mode 100644
index 00000000000..8b6cdae0eda
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/generated/header-link.sub.html
@@ -0,0 +1,460 @@
+<!DOCTYPE html>
+<!--
+This test was procedurally generated. Please do not modify it directly.
+Sources:
+- fetch/metadata/tools/fetch-metadata.conf.yml
+- fetch/metadata/tools/templates/header-link.sub.html
+-->
+<html lang="en">
+  <meta charset="utf-8">
+  <title>HTTP headers on request for HTTP "Link" header</title>
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  <script src="/fetch/metadata/resources/helper.sub.js"></script>
+  <body>
+  <script>
+  'use strict';
+
+  function induceRequest(url, rel, test) {
+    const iframe = document.createElement('iframe');
+
+    iframe.setAttribute(
+      'src',
+      '/fetch/metadata/resources/header-link.py' +
+        `?location=${encodeURIComponent(url)}&rel=${rel}`
+    );
+
+    document.body.appendChild(iframe);
+    test.add_cleanup(() => iframe.remove());
+
+    return new Promise((resolve) => {
+        iframe.onload = iframe.onerror = resolve;
+      });
+  }
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpOrigin'], {mime: 'text/html'}),
+        'icon',
+        t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        });
+  }, 'sec-fetch-site rel=icon - Not sent to non-trustworthy same-origin destination');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpOrigin'], {mime: 'text/html'}),
+        'stylesheet',
+        t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        });
+  }, 'sec-fetch-site rel=stylesheet - Not sent to non-trustworthy same-origin destination');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpSameSite'], {mime: 'text/html'}),
+        'icon',
+        t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        });
+  }, 'sec-fetch-site rel=icon - Not sent to non-trustworthy same-site destination');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpSameSite'], {mime: 'text/html'}),
+        'stylesheet',
+        t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        });
+  }, 'sec-fetch-site rel=stylesheet - Not sent to non-trustworthy same-site destination');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpCrossSite'], {mime: 'text/html'}),
+        'icon',
+        t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        });
+  }, 'sec-fetch-site rel=icon - Not sent to non-trustworthy cross-site destination');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpCrossSite'], {mime: 'text/html'}),
+        'stylesheet',
+        t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        });
+  }, 'sec-fetch-site rel=stylesheet - Not sent to non-trustworthy cross-site destination');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpOrigin'], {mime: 'text/html'}),
+        'icon',
+        t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-mode');
+        });
+  }, 'sec-fetch-mode rel=icon - Not sent to non-trustworthy same-origin destination');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpOrigin'], {mime: 'text/html'}),
+        'stylesheet',
+        t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-mode');
+        });
+  }, 'sec-fetch-mode rel=stylesheet - Not sent to non-trustworthy same-origin destination');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpSameSite'], {mime: 'text/html'}),
+        'icon',
+        t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-mode');
+        });
+  }, 'sec-fetch-mode rel=icon - Not sent to non-trustworthy same-site destination');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpSameSite'], {mime: 'text/html'}),
+        'stylesheet',
+        t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-mode');
+        });
+  }, 'sec-fetch-mode rel=stylesheet - Not sent to non-trustworthy same-site destination');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpCrossSite'], {mime: 'text/html'}),
+        'icon',
+        t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-mode');
+        });
+  }, 'sec-fetch-mode rel=icon - Not sent to non-trustworthy cross-site destination');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpCrossSite'], {mime: 'text/html'}),
+        'stylesheet',
+        t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-mode');
+        });
+  }, 'sec-fetch-mode rel=stylesheet - Not sent to non-trustworthy cross-site destination');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpOrigin'], {mime: 'text/html'}),
+        'icon',
+        t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-dest');
+        });
+  }, 'sec-fetch-dest rel=icon - Not sent to non-trustworthy same-origin destination');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpOrigin'], {mime: 'text/html'}),
+        'stylesheet',
+        t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-dest');
+        });
+  }, 'sec-fetch-dest rel=stylesheet - Not sent to non-trustworthy same-origin destination');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpSameSite'], {mime: 'text/html'}),
+        'icon',
+        t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-dest');
+        });
+  }, 'sec-fetch-dest rel=icon - Not sent to non-trustworthy same-site destination');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpSameSite'], {mime: 'text/html'}),
+        'stylesheet',
+        t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-dest');
+        });
+  }, 'sec-fetch-dest rel=stylesheet - Not sent to non-trustworthy same-site destination');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpCrossSite'], {mime: 'text/html'}),
+        'icon',
+        t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-dest');
+        });
+  }, 'sec-fetch-dest rel=icon - Not sent to non-trustworthy cross-site destination');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpCrossSite'], {mime: 'text/html'}),
+        'stylesheet',
+        t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-dest');
+        });
+  }, 'sec-fetch-dest rel=stylesheet - Not sent to non-trustworthy cross-site destination');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpOrigin'], {mime: 'text/html'}),
+        'icon',
+        t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user rel=icon - Not sent to non-trustworthy same-origin destination');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpOrigin'], {mime: 'text/html'}),
+        'stylesheet',
+        t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user rel=stylesheet - Not sent to non-trustworthy same-origin destination');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpSameSite'], {mime: 'text/html'}),
+        'icon',
+        t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user rel=icon - Not sent to non-trustworthy same-site destination');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpSameSite'], {mime: 'text/html'}),
+        'stylesheet',
+        t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user rel=stylesheet - Not sent to non-trustworthy same-site destination');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpCrossSite'], {mime: 'text/html'}),
+        'icon',
+        t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user rel=icon - Not sent to non-trustworthy cross-site destination');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpCrossSite'], {mime: 'text/html'}),
+        'stylesheet',
+        t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user rel=stylesheet - Not sent to non-trustworthy cross-site destination');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsOrigin', 'httpOrigin'], {mime: 'text/html'}),
+        'icon',
+        t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        });
+  }, 'sec-fetch-site rel=icon - HTTPS downgrade (header not sent)');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsOrigin', 'httpOrigin'], {mime: 'text/html'}),
+        'stylesheet',
+        t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        });
+  }, 'sec-fetch-site rel=stylesheet - HTTPS downgrade (header not sent)');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpOrigin', 'httpsOrigin'], {mime: 'text/html'}),
+        'icon',
+        t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site rel=icon - HTTPS upgrade');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpOrigin', 'httpsOrigin'], {mime: 'text/html'}),
+        'stylesheet',
+        t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site rel=stylesheet - HTTPS upgrade');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsOrigin', 'httpOrigin', 'httpsOrigin'], {mime: 'text/html'}),
+        'icon',
+        t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site rel=icon - HTTPS downgrade-upgrade');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsOrigin', 'httpOrigin', 'httpsOrigin'], {mime: 'text/html'}),
+        'stylesheet',
+        t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site rel=stylesheet - HTTPS downgrade-upgrade');
+  </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/fetch/metadata/generated/header-refresh.https.optional.sub.html b/test/wpt/tests/fetch/metadata/generated/header-refresh.https.optional.sub.html
new file mode 100644
index 00000000000..e63ee423cd7
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/generated/header-refresh.https.optional.sub.html
@@ -0,0 +1,273 @@
+<!DOCTYPE html>
+<!--
+This test was procedurally generated. Please do not modify it directly.
+Sources:
+- fetch/metadata/tools/fetch-metadata.conf.yml
+- fetch/metadata/tools/templates/header-refresh.optional.sub.html
+-->
+<html lang="en">
+  <meta charset="utf-8">
+  <meta name="timeout" content="long">
+  <title>HTTP headers on request for HTTP "Refresh" header</title>
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  <script src="/fetch/metadata/resources/helper.sub.js"></script>
+  <body>
+  <script>
+  'use strict';
+
+  function induceRequest(url, test) {
+    const win = window.open();
+    test.add_cleanup(() => win.close());
+
+    win.location = `/common/refresh.py?location=${encodeURIComponent(url)}`
+
+    return new Promise((resolve) => {
+      addEventListener('message', (event) => {
+          if (event.source === win) {
+            resolve();
+          }
+        });
+    });
+  }
+
+  const responseParams = {
+    mime: 'text/html',
+    body: `<script>opener.postMessage(0, '*')</${''}script>`
+  };
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsOrigin'], responseParams), t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-origin']);
+        });
+  }, 'sec-fetch-site - Same origin');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsCrossSite'], responseParams), t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Cross-site');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsSameSite'], responseParams), t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - Same site');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsOrigin', 'httpsCrossSite', 'httpsOrigin'], responseParams), t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Same-Origin -> Cross-Site -> Same-Origin redirect');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsOrigin', 'httpsSameSite', 'httpsOrigin'], responseParams), t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - Same-Origin -> Same-Site -> Same-Origin redirect');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsCrossSite', 'httpsOrigin'], responseParams), t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Cross-Site -> Same Origin');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsCrossSite', 'httpsSameSite'], responseParams), t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Cross-Site -> Same-Site');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsCrossSite', 'httpsCrossSite'], responseParams), t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Cross-Site -> Cross-Site');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsOrigin', 'httpsOrigin'], responseParams), t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-origin']);
+        });
+  }, 'sec-fetch-site - Same-Origin -> Same Origin');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsOrigin', 'httpsSameSite'], responseParams), t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - Same-Origin -> Same-Site');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsOrigin', 'httpsCrossSite'], responseParams), t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Same-Origin -> Cross-Site');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsSameSite', 'httpsOrigin'], responseParams), t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - Same-Site -> Same Origin');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsSameSite', 'httpsSameSite'], responseParams), t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - Same-Site -> Same-Site');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsSameSite', 'httpsCrossSite'], responseParams), t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Same-Site -> Cross-Site');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsOrigin', 'httpOrigin', 'httpsOrigin'], responseParams), t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - HTTPS downgrade-upgrade');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, [], responseParams), t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-mode');
+          assert_array_equals(headers['sec-fetch-mode'], ['navigate']);
+        });
+  }, 'sec-fetch-mode');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, [], responseParams), t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-dest');
+          assert_array_equals(headers['sec-fetch-dest'], ['document']);
+        });
+  }, 'sec-fetch-dest');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, [], responseParams), t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user');
+  </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/fetch/metadata/generated/header-refresh.optional.sub.html b/test/wpt/tests/fetch/metadata/generated/header-refresh.optional.sub.html
new file mode 100644
index 00000000000..4674ada9c6d
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/generated/header-refresh.optional.sub.html
@@ -0,0 +1,222 @@
+<!DOCTYPE html>
+<!--
+This test was procedurally generated. Please do not modify it directly.
+Sources:
+- fetch/metadata/tools/fetch-metadata.conf.yml
+- fetch/metadata/tools/templates/header-refresh.optional.sub.html
+-->
+<html lang="en">
+  <meta charset="utf-8">
+  <meta name="timeout" content="long">
+  <title>HTTP headers on request for HTTP "Refresh" header</title>
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  <script src="/fetch/metadata/resources/helper.sub.js"></script>
+  <body>
+  <script>
+  'use strict';
+
+  function induceRequest(url, test) {
+    const win = window.open();
+    test.add_cleanup(() => win.close());
+
+    win.location = `/common/refresh.py?location=${encodeURIComponent(url)}`
+
+    return new Promise((resolve) => {
+      addEventListener('message', (event) => {
+          if (event.source === win) {
+            resolve();
+          }
+        });
+    });
+  }
+
+  const responseParams = {
+    mime: 'text/html',
+    body: `<script>opener.postMessage(0, '*')</${''}script>`
+  };
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpOrigin'], responseParams), t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        });
+  }, 'sec-fetch-site - Not sent to non-trustworthy same-origin destination');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpSameSite'], responseParams), t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        });
+  }, 'sec-fetch-site - Not sent to non-trustworthy same-site destination');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpCrossSite'], responseParams), t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        });
+  }, 'sec-fetch-site - Not sent to non-trustworthy cross-site destination');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpOrigin'], responseParams), t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-mode');
+        });
+  }, 'sec-fetch-mode - Not sent to non-trustworthy same-origin destination');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpSameSite'], responseParams), t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-mode');
+        });
+  }, 'sec-fetch-mode - Not sent to non-trustworthy same-site destination');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpCrossSite'], responseParams), t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-mode');
+        });
+  }, 'sec-fetch-mode - Not sent to non-trustworthy cross-site destination');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpOrigin'], responseParams), t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-dest');
+        });
+  }, 'sec-fetch-dest - Not sent to non-trustworthy same-origin destination');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpSameSite'], responseParams), t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-dest');
+        });
+  }, 'sec-fetch-dest - Not sent to non-trustworthy same-site destination');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpCrossSite'], responseParams), t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-dest');
+        });
+  }, 'sec-fetch-dest - Not sent to non-trustworthy cross-site destination');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpOrigin'], responseParams), t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user - Not sent to non-trustworthy same-origin destination');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpSameSite'], responseParams), t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user - Not sent to non-trustworthy same-site destination');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpCrossSite'], responseParams), t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user - Not sent to non-trustworthy cross-site destination');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsOrigin', 'httpOrigin'], responseParams), t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        });
+  }, 'sec-fetch-site - HTTPS downgrade (header not sent)');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpOrigin', 'httpsOrigin'], responseParams), t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - HTTPS upgrade');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, ['httpsOrigin', 'httpOrigin', 'httpsOrigin'], responseParams), t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - HTTPS downgrade-upgrade');
+  </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/fetch/metadata/generated/script-module-import-dynamic.https.sub.html b/test/wpt/tests/fetch/metadata/generated/script-module-import-dynamic.https.sub.html
new file mode 100644
index 00000000000..72d60fc30cb
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/generated/script-module-import-dynamic.https.sub.html
@@ -0,0 +1,254 @@
+<!DOCTYPE html>
+<!--
+This test was procedurally generated. Please do not modify it directly.
+Sources:
+- fetch/metadata/tools/fetch-metadata.conf.yml
+- fetch/metadata/tools/templates/script-module-import-dynamic.sub.html
+-->
+<html lang="en">
+  <meta charset="utf-8">
+  <title>HTTP headers on request for dynamic ECMAScript module import</title>
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  <script src="/fetch/metadata/resources/helper.sub.js"></script>
+  <script type="module">
+  'use strict';
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, ['httpsOrigin'], { mime: 'application/javascript' }
+    );
+
+    return import(url)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-origin']);
+        });
+  }, 'sec-fetch-site - Same origin');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, ['httpsCrossSite'], { mime: 'application/javascript' }
+    );
+
+    return import(url)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Cross-site');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, ['httpsSameSite'], { mime: 'application/javascript' }
+    );
+
+    return import(url)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - Same site');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, ['httpsOrigin', 'httpsCrossSite', 'httpsOrigin'], { mime: 'application/javascript' }
+    );
+
+    return import(url)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Same-Origin -> Cross-Site -> Same-Origin redirect');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, ['httpsOrigin', 'httpsSameSite', 'httpsOrigin'], { mime: 'application/javascript' }
+    );
+
+    return import(url)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - Same-Origin -> Same-Site -> Same-Origin redirect');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, ['httpsCrossSite', 'httpsOrigin'], { mime: 'application/javascript' }
+    );
+
+    return import(url)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Cross-Site -> Same Origin');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, ['httpsCrossSite', 'httpsSameSite'], { mime: 'application/javascript' }
+    );
+
+    return import(url)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Cross-Site -> Same-Site');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, ['httpsCrossSite', 'httpsCrossSite'], { mime: 'application/javascript' }
+    );
+
+    return import(url)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Cross-Site -> Cross-Site');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, ['httpsOrigin', 'httpsOrigin'], { mime: 'application/javascript' }
+    );
+
+    return import(url)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-origin']);
+        });
+  }, 'sec-fetch-site - Same-Origin -> Same Origin');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, ['httpsOrigin', 'httpsSameSite'], { mime: 'application/javascript' }
+    );
+
+    return import(url)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - Same-Origin -> Same-Site');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, ['httpsOrigin', 'httpsCrossSite'], { mime: 'application/javascript' }
+    );
+
+    return import(url)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Same-Origin -> Cross-Site');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, ['httpsSameSite', 'httpsOrigin'], { mime: 'application/javascript' }
+    );
+
+    return import(url)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - Same-Site -> Same Origin');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, ['httpsSameSite', 'httpsSameSite'], { mime: 'application/javascript' }
+    );
+
+    return import(url)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - Same-Site -> Same-Site');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, ['httpsSameSite', 'httpsCrossSite'], { mime: 'application/javascript' }
+    );
+
+    return import(url)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Same-Site -> Cross-Site');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, [], { mime: 'application/javascript' }
+    );
+
+    return import(url)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-mode');
+          assert_array_equals(headers['sec-fetch-mode'], ['cors']);
+        });
+  }, 'sec-fetch-mode');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, [], { mime: 'application/javascript' }
+    );
+
+    return import(url)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-dest');
+          assert_array_equals(headers['sec-fetch-dest'], ['script']);
+        });
+  }, 'sec-fetch-dest');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, [], { mime: 'application/javascript' }
+    );
+
+    return import(url)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user');
+  </script>
+</html>
diff --git a/test/wpt/tests/fetch/metadata/generated/script-module-import-dynamic.sub.html b/test/wpt/tests/fetch/metadata/generated/script-module-import-dynamic.sub.html
new file mode 100644
index 00000000000..088720c23e0
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/generated/script-module-import-dynamic.sub.html
@@ -0,0 +1,214 @@
+<!DOCTYPE html>
+<!--
+This test was procedurally generated. Please do not modify it directly.
+Sources:
+- fetch/metadata/tools/fetch-metadata.conf.yml
+- fetch/metadata/tools/templates/script-module-import-dynamic.sub.html
+-->
+<html lang="en">
+  <meta charset="utf-8">
+  <title>HTTP headers on request for dynamic ECMAScript module import</title>
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  <script src="/fetch/metadata/resources/helper.sub.js"></script>
+  <script type="module">
+  'use strict';
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, ['httpOrigin'], { mime: 'application/javascript' }
+    );
+
+    return import(url)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        });
+  }, 'sec-fetch-site - Not sent to non-trustworthy same-origin destination');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, ['httpSameSite'], { mime: 'application/javascript' }
+    );
+
+    return import(url)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        });
+  }, 'sec-fetch-site - Not sent to non-trustworthy same-site destination');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, ['httpCrossSite'], { mime: 'application/javascript' }
+    );
+
+    return import(url)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        });
+  }, 'sec-fetch-site - Not sent to non-trustworthy cross-site destination');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, ['httpOrigin'], { mime: 'application/javascript' }
+    );
+
+    return import(url)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-mode');
+        });
+  }, 'sec-fetch-mode - Not sent to non-trustworthy same-origin destination');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, ['httpSameSite'], { mime: 'application/javascript' }
+    );
+
+    return import(url)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-mode');
+        });
+  }, 'sec-fetch-mode - Not sent to non-trustworthy same-site destination');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, ['httpCrossSite'], { mime: 'application/javascript' }
+    );
+
+    return import(url)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-mode');
+        });
+  }, 'sec-fetch-mode - Not sent to non-trustworthy cross-site destination');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, ['httpOrigin'], { mime: 'application/javascript' }
+    );
+
+    return import(url)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-dest');
+        });
+  }, 'sec-fetch-dest - Not sent to non-trustworthy same-origin destination');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, ['httpSameSite'], { mime: 'application/javascript' }
+    );
+
+    return import(url)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-dest');
+        });
+  }, 'sec-fetch-dest - Not sent to non-trustworthy same-site destination');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, ['httpCrossSite'], { mime: 'application/javascript' }
+    );
+
+    return import(url)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-dest');
+        });
+  }, 'sec-fetch-dest - Not sent to non-trustworthy cross-site destination');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, ['httpOrigin'], { mime: 'application/javascript' }
+    );
+
+    return import(url)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user - Not sent to non-trustworthy same-origin destination');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, ['httpSameSite'], { mime: 'application/javascript' }
+    );
+
+    return import(url)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user - Not sent to non-trustworthy same-site destination');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, ['httpCrossSite'], { mime: 'application/javascript' }
+    );
+
+    return import(url)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user - Not sent to non-trustworthy cross-site destination');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, ['httpsOrigin', 'httpOrigin'], { mime: 'application/javascript' }
+    );
+
+    return import(url)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        });
+  }, 'sec-fetch-site - HTTPS downgrade (header not sent)');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, ['httpOrigin', 'httpsOrigin'], { mime: 'application/javascript' }
+    );
+
+    return import(url)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - HTTPS upgrade');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, ['httpsOrigin', 'httpOrigin', 'httpsOrigin'], { mime: 'application/javascript' }
+    );
+
+    return import(url)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - HTTPS downgrade-upgrade');
+  </script>
+</html>
diff --git a/test/wpt/tests/fetch/metadata/generated/script-module-import-static.https.sub.html b/test/wpt/tests/fetch/metadata/generated/script-module-import-static.https.sub.html
new file mode 100644
index 00000000000..cea3464f807
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/generated/script-module-import-static.https.sub.html
@@ -0,0 +1,288 @@
+<!DOCTYPE html>
+<!--
+This test was procedurally generated. Please do not modify it directly.
+Sources:
+- fetch/metadata/tools/fetch-metadata.conf.yml
+- fetch/metadata/tools/templates/script-module-import-static.sub.html
+-->
+<html lang="en">
+  <meta charset="utf-8">
+  <title>HTTP headers on request for static ECMAScript module import</title>
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  <script src="/fetch/metadata/resources/helper.sub.js"></script>
+  <body>
+  <script>
+  'use strict';
+
+  function induceRequest(url) {
+    const script = document.createElement('script');
+    script.setAttribute('type', 'module');
+    script.setAttribute(
+      'src',
+      '/fetch/metadata/resources/es-module.sub.js?moduleId=' + encodeURIComponent(url)
+    );
+
+    return new Promise((resolve, reject) => {
+        script.onload = resolve;
+        script.onerror = () => reject('Failed to load script');
+        document.body.appendChild(script);
+      })
+      .then(() => script.remove());
+  }
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(
+          key, ['httpsOrigin'], { mime: 'application/javascript' }
+        )
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-origin']);
+        });
+  }, 'sec-fetch-site - Same origin');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(
+          key, ['httpsCrossSite'], { mime: 'application/javascript' }
+        )
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Cross-site');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(
+          key, ['httpsSameSite'], { mime: 'application/javascript' }
+        )
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - Same site');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(
+          key, ['httpsOrigin', 'httpsCrossSite', 'httpsOrigin'], { mime: 'application/javascript' }
+        )
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Same-Origin -> Cross-Site -> Same-Origin redirect');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(
+          key, ['httpsOrigin', 'httpsSameSite', 'httpsOrigin'], { mime: 'application/javascript' }
+        )
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - Same-Origin -> Same-Site -> Same-Origin redirect');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(
+          key, ['httpsCrossSite', 'httpsOrigin'], { mime: 'application/javascript' }
+        )
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Cross-Site -> Same Origin');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(
+          key, ['httpsCrossSite', 'httpsSameSite'], { mime: 'application/javascript' }
+        )
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Cross-Site -> Same-Site');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(
+          key, ['httpsCrossSite', 'httpsCrossSite'], { mime: 'application/javascript' }
+        )
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Cross-Site -> Cross-Site');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(
+          key, ['httpsOrigin', 'httpsOrigin'], { mime: 'application/javascript' }
+        )
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-origin']);
+        });
+  }, 'sec-fetch-site - Same-Origin -> Same Origin');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(
+          key, ['httpsOrigin', 'httpsSameSite'], { mime: 'application/javascript' }
+        )
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - Same-Origin -> Same-Site');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(
+          key, ['httpsOrigin', 'httpsCrossSite'], { mime: 'application/javascript' }
+        )
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Same-Origin -> Cross-Site');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(
+          key, ['httpsSameSite', 'httpsOrigin'], { mime: 'application/javascript' }
+        )
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - Same-Site -> Same Origin');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(
+          key, ['httpsSameSite', 'httpsSameSite'], { mime: 'application/javascript' }
+        )
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - Same-Site -> Same-Site');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(
+          key, ['httpsSameSite', 'httpsCrossSite'], { mime: 'application/javascript' }
+        )
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Same-Site -> Cross-Site');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(
+          key, [], { mime: 'application/javascript' }
+        )
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-mode');
+          assert_array_equals(headers['sec-fetch-mode'], ['cors']);
+        });
+  }, 'sec-fetch-mode');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(
+          key, [], { mime: 'application/javascript' }
+        )
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-dest');
+          assert_array_equals(headers['sec-fetch-dest'], ['script']);
+        });
+  }, 'sec-fetch-dest');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(
+          key, [], { mime: 'application/javascript' }
+        )
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user');
+  </script>
+</html>
diff --git a/test/wpt/tests/fetch/metadata/generated/script-module-import-static.sub.html b/test/wpt/tests/fetch/metadata/generated/script-module-import-static.sub.html
new file mode 100644
index 00000000000..0f94f71cf6f
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/generated/script-module-import-static.sub.html
@@ -0,0 +1,246 @@
+<!DOCTYPE html>
+<!--
+This test was procedurally generated. Please do not modify it directly.
+Sources:
+- fetch/metadata/tools/fetch-metadata.conf.yml
+- fetch/metadata/tools/templates/script-module-import-static.sub.html
+-->
+<html lang="en">
+  <meta charset="utf-8">
+  <title>HTTP headers on request for static ECMAScript module import</title>
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  <script src="/fetch/metadata/resources/helper.sub.js"></script>
+  <body>
+  <script>
+  'use strict';
+
+  function induceRequest(url) {
+    const script = document.createElement('script');
+    script.setAttribute('type', 'module');
+    script.setAttribute(
+      'src',
+      '/fetch/metadata/resources/es-module.sub.js?moduleId=' + encodeURIComponent(url)
+    );
+
+    return new Promise((resolve, reject) => {
+        script.onload = resolve;
+        script.onerror = () => reject('Failed to load script');
+        document.body.appendChild(script);
+      })
+      .then(() => script.remove());
+  }
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(
+          key, ['httpOrigin'], { mime: 'application/javascript' }
+        )
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        });
+  }, 'sec-fetch-site - Not sent to non-trustworthy same-origin destination');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(
+          key, ['httpSameSite'], { mime: 'application/javascript' }
+        )
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        });
+  }, 'sec-fetch-site - Not sent to non-trustworthy same-site destination');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(
+          key, ['httpCrossSite'], { mime: 'application/javascript' }
+        )
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        });
+  }, 'sec-fetch-site - Not sent to non-trustworthy cross-site destination');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(
+          key, ['httpOrigin'], { mime: 'application/javascript' }
+        )
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-mode');
+        });
+  }, 'sec-fetch-mode - Not sent to non-trustworthy same-origin destination');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(
+          key, ['httpSameSite'], { mime: 'application/javascript' }
+        )
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-mode');
+        });
+  }, 'sec-fetch-mode - Not sent to non-trustworthy same-site destination');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(
+          key, ['httpCrossSite'], { mime: 'application/javascript' }
+        )
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-mode');
+        });
+  }, 'sec-fetch-mode - Not sent to non-trustworthy cross-site destination');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(
+          key, ['httpOrigin'], { mime: 'application/javascript' }
+        )
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-dest');
+        });
+  }, 'sec-fetch-dest - Not sent to non-trustworthy same-origin destination');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(
+          key, ['httpSameSite'], { mime: 'application/javascript' }
+        )
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-dest');
+        });
+  }, 'sec-fetch-dest - Not sent to non-trustworthy same-site destination');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(
+          key, ['httpCrossSite'], { mime: 'application/javascript' }
+        )
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-dest');
+        });
+  }, 'sec-fetch-dest - Not sent to non-trustworthy cross-site destination');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(
+          key, ['httpOrigin'], { mime: 'application/javascript' }
+        )
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user - Not sent to non-trustworthy same-origin destination');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(
+          key, ['httpSameSite'], { mime: 'application/javascript' }
+        )
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user - Not sent to non-trustworthy same-site destination');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(
+          key, ['httpCrossSite'], { mime: 'application/javascript' }
+        )
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user - Not sent to non-trustworthy cross-site destination');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(
+          key, ['httpsOrigin', 'httpOrigin'], { mime: 'application/javascript' }
+        )
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        });
+  }, 'sec-fetch-site - HTTPS downgrade (header not sent)');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(
+          key, ['httpOrigin', 'httpsOrigin'], { mime: 'application/javascript' }
+        )
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - HTTPS upgrade');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(
+          key, ['httpsOrigin', 'httpOrigin', 'httpsOrigin'], { mime: 'application/javascript' }
+        )
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - HTTPS downgrade-upgrade');
+  </script>
+</html>
diff --git a/test/wpt/tests/fetch/metadata/generated/serviceworker.https.sub.html b/test/wpt/tests/fetch/metadata/generated/serviceworker.https.sub.html
new file mode 100644
index 00000000000..12e37369a42
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/generated/serviceworker.https.sub.html
@@ -0,0 +1,170 @@
+<!DOCTYPE html>
+<!--
+This test was procedurally generated. Please do not modify it directly.
+Sources:
+- fetch/metadata/tools/fetch-metadata.conf.yml
+- fetch/metadata/tools/templates/serviceworker.https.sub.html
+-->
+<!DOCTYPE html>
+<html lang="en">
+  <meta charset="utf-8">
+  <title>HTTP headers on request for Service Workers</title>
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  <script src="/fetch/metadata/resources/helper.sub.js"></script>
+  <body>
+  <script>
+  'use strict';
+
+  function induceRequest(t, url, options, event, clear) {
+    // Register a service worker and check the request header.
+    return navigator.serviceWorker.register(url, options)
+      .then((registration) => {
+        t.add_cleanup(() => registration.unregister());
+        if (event === 'register') {
+          return;
+        }
+        return clear().then(() => registration.update());
+      });
+  }
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, ['httpsOrigin'], { mime: 'application/javascript' }
+    );
+
+    return induceRequest(t, url, {}, 'register')
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-origin']);
+        });
+  }, 'sec-fetch-site - Same origin, no options - registration');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, ['httpsOrigin'], { mime: 'application/javascript' }
+    );
+
+    return induceRequest(t, url, {}, 'update', () => retrieve(key))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-origin']);
+        });
+  }, 'sec-fetch-site - Same origin, no options - updating');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, [], { mime: 'application/javascript' }
+    );
+
+    return induceRequest(t, url, {"type": "classic"}, 'register')
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-mode');
+          assert_array_equals(headers['sec-fetch-mode'], ['same-origin']);
+        });
+  }, 'sec-fetch-mode - options: type=classic - registration');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, [], { mime: 'application/javascript' }
+    );
+
+    return induceRequest(t, url, {"type": "classic"}, 'update', () => retrieve(key))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-mode');
+          assert_array_equals(headers['sec-fetch-mode'], ['same-origin']);
+        });
+  }, 'sec-fetch-mode - options: type=classic - updating');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, [], { mime: 'application/javascript' }
+    );
+
+    return induceRequest(t, url, {}, 'register')
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-mode');
+          assert_array_equals(headers['sec-fetch-mode'], ['same-origin']);
+        });
+  }, 'sec-fetch-mode - no options - registration');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, [], { mime: 'application/javascript' }
+    );
+
+    return induceRequest(t, url, {}, 'update', () => retrieve(key))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-mode');
+          assert_array_equals(headers['sec-fetch-mode'], ['same-origin']);
+        });
+  }, 'sec-fetch-mode - no options - updating');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, [], { mime: 'application/javascript' }
+    );
+
+    return induceRequest(t, url, {}, 'register')
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-dest');
+          assert_array_equals(headers['sec-fetch-dest'], ['serviceworker']);
+        });
+  }, 'sec-fetch-dest - no options - registration');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, [], { mime: 'application/javascript' }
+    );
+
+    return induceRequest(t, url, {}, 'update', () => retrieve(key))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-dest');
+          assert_array_equals(headers['sec-fetch-dest'], ['serviceworker']);
+        });
+  }, 'sec-fetch-dest - no options - updating');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, [], { mime: 'application/javascript' }
+    );
+
+    return induceRequest(t, url, {}, 'register')
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user - no options - registration');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, [], { mime: 'application/javascript' }
+    );
+
+    return induceRequest(t, url, {}, 'update', () => retrieve(key))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user - no options - updating');
+  </script>
+</body>
+</html>
diff --git a/test/wpt/tests/fetch/metadata/generated/svg-image.https.sub.html b/test/wpt/tests/fetch/metadata/generated/svg-image.https.sub.html
new file mode 100644
index 00000000000..b059eb31456
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/generated/svg-image.https.sub.html
@@ -0,0 +1,367 @@
+<!DOCTYPE html>
+<!--
+This test was procedurally generated. Please do not modify it directly.
+Sources:
+- fetch/metadata/tools/fetch-metadata.conf.yml
+- fetch/metadata/tools/templates/svg-image.sub.html
+-->
+<html lang="en">
+  <meta charset="utf-8">
+  <meta name="timeout" content="long">
+  <title>HTTP headers on request for SVG "image" element source</title>
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  <script src="/fetch/metadata/resources/helper.sub.js"></script>
+  <body>
+  <script>
+  'use strict';
+
+  const params = {
+    body: `
+      <svg xmlns="http://www.w3.org/2000/svg" width="123" height="123">
+        <rect fill="lime" width="123" height="123"/>
+      </svg>
+    `,
+    mime: 'image/svg+xml'
+  };
+
+  function induceRequest(t, url, attributes) {
+    const svg = document.createElementNS("http://www.w3.org/2000/svg", "svg");
+    svg.setAttributeNS(
+      "http://www.w3.org/2000/xmlns/",
+      "xmlns:xlink",
+      "http://www.w3.org/1999/xlink"
+    );
+    const image = document.createElementNS("http://www.w3.org/2000/svg", "image");
+    image.setAttribute("href", url);
+    svg.appendChild(image);
+
+    for (const [ name, value ] of Object.entries(attributes)) {
+      image.setAttribute(name, value);
+    }
+
+    document.body.appendChild(svg);
+    t.add_cleanup(() => svg.remove());
+
+    return new Promise((resolve, reject) => {
+      image.onload = resolve;
+      image.onerror = reject;
+    });
+  }
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        t,
+        makeRequestURL(key, ['httpsOrigin'], params),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-origin']);
+      });
+  }, 'sec-fetch-site - Same origin no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        t,
+        makeRequestURL(key, ['httpsCrossSite'], params),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+      });
+  }, 'sec-fetch-site - Cross-site no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        t,
+        makeRequestURL(key, ['httpsSameSite'], params),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+      });
+  }, 'sec-fetch-site - Same site no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        t,
+        makeRequestURL(key, ['httpsOrigin', 'httpsCrossSite', 'httpsOrigin'], params),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+      });
+  }, 'sec-fetch-site - Same-Origin -> Cross-Site -> Same-Origin redirect no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        t,
+        makeRequestURL(key, ['httpsOrigin', 'httpsSameSite', 'httpsOrigin'], params),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+      });
+  }, 'sec-fetch-site - Same-Origin -> Same-Site -> Same-Origin redirect no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        t,
+        makeRequestURL(key, ['httpsCrossSite', 'httpsOrigin'], params),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+      });
+  }, 'sec-fetch-site - Cross-Site -> Same Origin no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        t,
+        makeRequestURL(key, ['httpsCrossSite', 'httpsSameSite'], params),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+      });
+  }, 'sec-fetch-site - Cross-Site -> Same-Site no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        t,
+        makeRequestURL(key, ['httpsCrossSite', 'httpsCrossSite'], params),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+      });
+  }, 'sec-fetch-site - Cross-Site -> Cross-Site no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        t,
+        makeRequestURL(key, ['httpsOrigin', 'httpsOrigin'], params),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-origin']);
+      });
+  }, 'sec-fetch-site - Same-Origin -> Same Origin no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        t,
+        makeRequestURL(key, ['httpsOrigin', 'httpsSameSite'], params),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+      });
+  }, 'sec-fetch-site - Same-Origin -> Same-Site no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        t,
+        makeRequestURL(key, ['httpsOrigin', 'httpsCrossSite'], params),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+      });
+  }, 'sec-fetch-site - Same-Origin -> Cross-Site no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        t,
+        makeRequestURL(key, ['httpsSameSite', 'httpsOrigin'], params),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+      });
+  }, 'sec-fetch-site - Same-Site -> Same Origin no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        t,
+        makeRequestURL(key, ['httpsSameSite', 'httpsSameSite'], params),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+      });
+  }, 'sec-fetch-site - Same-Site -> Same-Site no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        t,
+        makeRequestURL(key, ['httpsSameSite', 'httpsCrossSite'], params),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+      });
+  }, 'sec-fetch-site - Same-Site -> Cross-Site no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        t,
+        makeRequestURL(key, ['httpsOrigin', 'httpOrigin', 'httpsOrigin'], params),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+      });
+  }, 'sec-fetch-site - HTTPS downgrade-upgrade no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        t,
+        makeRequestURL(key, [], params),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-mode');
+          assert_array_equals(headers['sec-fetch-mode'], ['no-cors']);
+      });
+  }, 'sec-fetch-mode no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        t,
+        makeRequestURL(key, [], params),
+        {"crossorigin": ""}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-mode');
+          assert_array_equals(headers['sec-fetch-mode'], ['cors']);
+      });
+  }, 'sec-fetch-mode attributes: crossorigin');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        t,
+        makeRequestURL(key, [], params),
+        {"crossorigin": "anonymous"}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-mode');
+          assert_array_equals(headers['sec-fetch-mode'], ['cors']);
+      });
+  }, 'sec-fetch-mode attributes: crossorigin=anonymous');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        t,
+        makeRequestURL(key, [], params),
+        {"crossorigin": "use-credentials"}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-mode');
+          assert_array_equals(headers['sec-fetch-mode'], ['cors']);
+      });
+  }, 'sec-fetch-mode attributes: crossorigin=use-credentials');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        t,
+        makeRequestURL(key, [], params),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-dest');
+          assert_array_equals(headers['sec-fetch-dest'], ['empty']);
+      });
+  }, 'sec-fetch-dest no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        t,
+        makeRequestURL(key, [], params),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+      });
+  }, 'sec-fetch-user no attributes');
+  </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/fetch/metadata/generated/svg-image.sub.html b/test/wpt/tests/fetch/metadata/generated/svg-image.sub.html
new file mode 100644
index 00000000000..a28bbb12eb7
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/generated/svg-image.sub.html
@@ -0,0 +1,265 @@
+<!DOCTYPE html>
+<!--
+This test was procedurally generated. Please do not modify it directly.
+Sources:
+- fetch/metadata/tools/fetch-metadata.conf.yml
+- fetch/metadata/tools/templates/svg-image.sub.html
+-->
+<html lang="en">
+  <meta charset="utf-8">
+  <meta name="timeout" content="long">
+  <title>HTTP headers on request for SVG "image" element source</title>
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  <script src="/fetch/metadata/resources/helper.sub.js"></script>
+  <body>
+  <script>
+  'use strict';
+
+  const params = {
+    body: `
+      <svg xmlns="http://www.w3.org/2000/svg" width="123" height="123">
+        <rect fill="lime" width="123" height="123"/>
+      </svg>
+    `,
+    mime: 'image/svg+xml'
+  };
+
+  function induceRequest(t, url, attributes) {
+    const svg = document.createElementNS("http://www.w3.org/2000/svg", "svg");
+    svg.setAttributeNS(
+      "http://www.w3.org/2000/xmlns/",
+      "xmlns:xlink",
+      "http://www.w3.org/1999/xlink"
+    );
+    const image = document.createElementNS("http://www.w3.org/2000/svg", "image");
+    image.setAttribute("href", url);
+    svg.appendChild(image);
+
+    for (const [ name, value ] of Object.entries(attributes)) {
+      image.setAttribute(name, value);
+    }
+
+    document.body.appendChild(svg);
+    t.add_cleanup(() => svg.remove());
+
+    return new Promise((resolve, reject) => {
+      image.onload = resolve;
+      image.onerror = reject;
+    });
+  }
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        t,
+        makeRequestURL(key, ['httpOrigin'], params),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+      });
+  }, 'sec-fetch-site - Not sent to non-trustworthy same-origin destination no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        t,
+        makeRequestURL(key, ['httpSameSite'], params),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+      });
+  }, 'sec-fetch-site - Not sent to non-trustworthy same-site destination no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        t,
+        makeRequestURL(key, ['httpCrossSite'], params),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+      });
+  }, 'sec-fetch-site - Not sent to non-trustworthy cross-site destination no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        t,
+        makeRequestURL(key, ['httpOrigin'], params),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-mode');
+      });
+  }, 'sec-fetch-mode - Not sent to non-trustworthy same-origin destination no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        t,
+        makeRequestURL(key, ['httpSameSite'], params),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-mode');
+      });
+  }, 'sec-fetch-mode - Not sent to non-trustworthy same-site destination no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        t,
+        makeRequestURL(key, ['httpCrossSite'], params),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-mode');
+      });
+  }, 'sec-fetch-mode - Not sent to non-trustworthy cross-site destination no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        t,
+        makeRequestURL(key, ['httpOrigin'], params),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-dest');
+      });
+  }, 'sec-fetch-dest - Not sent to non-trustworthy same-origin destination no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        t,
+        makeRequestURL(key, ['httpSameSite'], params),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-dest');
+      });
+  }, 'sec-fetch-dest - Not sent to non-trustworthy same-site destination no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        t,
+        makeRequestURL(key, ['httpCrossSite'], params),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-dest');
+      });
+  }, 'sec-fetch-dest - Not sent to non-trustworthy cross-site destination no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        t,
+        makeRequestURL(key, ['httpOrigin'], params),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+      });
+  }, 'sec-fetch-user - Not sent to non-trustworthy same-origin destination no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        t,
+        makeRequestURL(key, ['httpSameSite'], params),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+      });
+  }, 'sec-fetch-user - Not sent to non-trustworthy same-site destination no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        t,
+        makeRequestURL(key, ['httpCrossSite'], params),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+      });
+  }, 'sec-fetch-user - Not sent to non-trustworthy cross-site destination no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        t,
+        makeRequestURL(key, ['httpsOrigin', 'httpOrigin'], params),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+      });
+  }, 'sec-fetch-site - HTTPS downgrade (header not sent) no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        t,
+        makeRequestURL(key, ['httpOrigin', 'httpsOrigin'], params),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+      });
+  }, 'sec-fetch-site - HTTPS upgrade no attributes');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        t,
+        makeRequestURL(key, ['httpsOrigin', 'httpOrigin', 'httpsOrigin'], params),
+        {}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+      });
+  }, 'sec-fetch-site - HTTPS downgrade-upgrade no attributes');
+  </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/fetch/metadata/generated/window-history.https.sub.html b/test/wpt/tests/fetch/metadata/generated/window-history.https.sub.html
new file mode 100644
index 00000000000..c2b3079a6d3
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/generated/window-history.https.sub.html
@@ -0,0 +1,237 @@
+<!DOCTYPE html>
+<!--
+This test was procedurally generated. Please do not modify it directly.
+Sources:
+- fetch/metadata/tools/fetch-metadata.conf.yml
+- fetch/metadata/tools/templates/window-history.sub.html
+-->
+<html lang="en">
+  <meta charset="utf-8">
+  <title>HTTP headers on request for navigation via the HTML History API</title>
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  <script src="/fetch/metadata/resources/helper.sub.js"></script>
+  <body>
+  <script>
+  'use strict';
+
+  const whenDone = (win) => {
+    return new Promise((resolve) => {
+      addEventListener('message', function handle(event) {
+        if (event.source === win) {
+          resolve();
+          removeEventListener('message', handle);
+        }
+      });
+    })
+  };
+
+  /**
+   * Prime the UA's session history such that the location of the request is
+   * immediately behind the current entry. Because the location may not be
+   * same-origin with the current browsing context, this must be done via a
+   * true navigation and not, e.g. the `history.pushState` API. The initial
+   * navigation will alter the WPT server's internal state; in order to avoid
+   * false positives, clear that state prior to initiating the second
+   * navigation via `history.back`.
+   */
+  function induceBackRequest(url, test, clear) {
+    const win = window.open(url);
+
+    test.add_cleanup(() => win.close());
+
+    return whenDone(win)
+      .then(clear)
+      .then(() => win.history.back())
+      .then(() => whenDone(win));
+  }
+
+  /**
+   * Prime the UA's session history such that the location of the request is
+   * immediately ahead of the current entry. Because the location may not be
+   * same-origin with the current browsing context, this must be done via a
+   * true navigation and not, e.g. the `history.pushState` API. The initial
+   * navigation will alter the WPT server's internal state; in order to avoid
+   * false positives, clear that state prior to initiating the second
+   * navigation via `history.forward`.
+   */
+  function induceForwardRequest(url, test, clear) {
+    const win = window.open(messageOpenerUrl);
+
+    test.add_cleanup(() => win.close());
+
+    return whenDone(win)
+      .then(() => win.location = url)
+      .then(() => whenDone(win))
+      .then(clear)
+      .then(() => win.history.go(-2))
+      .then(() => whenDone(win))
+      .then(() => win.history.forward())
+      .then(() => whenDone(win));
+  }
+
+  const messageOpenerUrl = new URL(
+    '/fetch/metadata/resources/message-opener.html', location
+  );
+  // For these tests to function, replacement must *not* be enabled during
+  // navigation. Assignment must therefore take place after the document has
+  // completely loaded [1]. This event is not directly observable, but it is
+  // scheduled as a task immediately following the global object's `load`
+  // event [2]. By queuing a task during the dispatch of the `load` event,
+  // navigation can be consistently triggered without replacement.
+  //
+  // [1] https://html.spec.whatwg.org/multipage/history.html#location-object-setter-navigate
+  // [2] https://html.spec.whatwg.org/multipage/parsing.html#the-end
+  const responseParams = {
+    mime: 'text/html',
+    body: `<script>
+      window.addEventListener('load', () => {
+        set`+`Timeout(() => location.assign('${messageOpenerUrl}'));
+      });
+    <`+`/script>`
+  };
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsOrigin'], responseParams);
+
+    return induceBackRequest(url, t, () => retrieve(key))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-origin']);
+        });
+  }, 'sec-fetch-site - Same origin - history.back');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsOrigin'], responseParams);
+
+    return induceForwardRequest(url, t, () => retrieve(key))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-origin']);
+        });
+  }, 'sec-fetch-site - Same origin - history.forward');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsCrossSite'], responseParams);
+
+    return induceBackRequest(url, t, () => retrieve(key))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Cross-site - history.back');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsCrossSite'], responseParams);
+
+    return induceForwardRequest(url, t, () => retrieve(key))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Cross-site - history.forward');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsSameSite'], responseParams);
+
+    return induceBackRequest(url, t, () => retrieve(key))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - Same site - history.back');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsSameSite'], responseParams);
+
+    return induceForwardRequest(url, t, () => retrieve(key))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - Same site - history.forward');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, [], responseParams);
+
+    return induceBackRequest(url, t, () => retrieve(key))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-mode');
+          assert_array_equals(headers['sec-fetch-mode'], ['navigate']);
+        });
+  }, 'sec-fetch-mode - history.back');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, [], responseParams);
+
+    return induceForwardRequest(url, t, () => retrieve(key))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-mode');
+          assert_array_equals(headers['sec-fetch-mode'], ['navigate']);
+        });
+  }, 'sec-fetch-mode - history.forward');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, [], responseParams);
+
+    return induceBackRequest(url, t, () => retrieve(key))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-dest');
+          assert_array_equals(headers['sec-fetch-dest'], ['document']);
+        });
+  }, 'sec-fetch-dest - history.back');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, [], responseParams);
+
+    return induceForwardRequest(url, t, () => retrieve(key))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-dest');
+          assert_array_equals(headers['sec-fetch-dest'], ['document']);
+        });
+  }, 'sec-fetch-dest - history.forward');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, [], responseParams);
+
+    return induceBackRequest(url, t, () => retrieve(key))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user - history.back');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, [], responseParams);
+
+    return induceForwardRequest(url, t, () => retrieve(key))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user - history.forward');
+  </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/fetch/metadata/generated/window-history.sub.html b/test/wpt/tests/fetch/metadata/generated/window-history.sub.html
new file mode 100644
index 00000000000..333d90c2860
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/generated/window-history.sub.html
@@ -0,0 +1,360 @@
+<!DOCTYPE html>
+<!--
+This test was procedurally generated. Please do not modify it directly.
+Sources:
+- fetch/metadata/tools/fetch-metadata.conf.yml
+- fetch/metadata/tools/templates/window-history.sub.html
+-->
+<html lang="en">
+  <meta charset="utf-8">
+  <meta name="timeout" content="long">
+  <title>HTTP headers on request for navigation via the HTML History API</title>
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  <script src="/fetch/metadata/resources/helper.sub.js"></script>
+  <body>
+  <script>
+  'use strict';
+
+  const whenDone = (win) => {
+    return new Promise((resolve) => {
+      addEventListener('message', function handle(event) {
+        if (event.source === win) {
+          resolve();
+          removeEventListener('message', handle);
+        }
+      });
+    })
+  };
+
+  /**
+   * Prime the UA's session history such that the location of the request is
+   * immediately behind the current entry. Because the location may not be
+   * same-origin with the current browsing context, this must be done via a
+   * true navigation and not, e.g. the `history.pushState` API. The initial
+   * navigation will alter the WPT server's internal state; in order to avoid
+   * false positives, clear that state prior to initiating the second
+   * navigation via `history.back`.
+   */
+  function induceBackRequest(url, test, clear) {
+    const win = window.open(url);
+
+    test.add_cleanup(() => win.close());
+
+    return whenDone(win)
+      .then(clear)
+      .then(() => win.history.back())
+      .then(() => whenDone(win));
+  }
+
+  /**
+   * Prime the UA's session history such that the location of the request is
+   * immediately ahead of the current entry. Because the location may not be
+   * same-origin with the current browsing context, this must be done via a
+   * true navigation and not, e.g. the `history.pushState` API. The initial
+   * navigation will alter the WPT server's internal state; in order to avoid
+   * false positives, clear that state prior to initiating the second
+   * navigation via `history.forward`.
+   */
+  function induceForwardRequest(url, test, clear) {
+    const win = window.open(messageOpenerUrl);
+
+    test.add_cleanup(() => win.close());
+
+    return whenDone(win)
+      .then(() => win.location = url)
+      .then(() => whenDone(win))
+      .then(clear)
+      .then(() => win.history.go(-2))
+      .then(() => whenDone(win))
+      .then(() => win.history.forward())
+      .then(() => whenDone(win));
+  }
+
+  const messageOpenerUrl = new URL(
+    '/fetch/metadata/resources/message-opener.html', location
+  );
+  // For these tests to function, replacement must *not* be enabled during
+  // navigation. Assignment must therefore take place after the document has
+  // completely loaded [1]. This event is not directly observable, but it is
+  // scheduled as a task immediately following the global object's `load`
+  // event [2]. By queuing a task during the dispatch of the `load` event,
+  // navigation can be consistently triggered without replacement.
+  //
+  // [1] https://html.spec.whatwg.org/multipage/history.html#location-object-setter-navigate
+  // [2] https://html.spec.whatwg.org/multipage/parsing.html#the-end
+  const responseParams = {
+    mime: 'text/html',
+    body: `<script>
+      window.addEventListener('load', () => {
+        set`+`Timeout(() => location.assign('${messageOpenerUrl}'));
+      });
+    <`+`/script>`
+  };
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpOrigin'], responseParams);
+
+    return induceBackRequest(url, t, () => retrieve(key))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        });
+  }, 'sec-fetch-site - Not sent to non-trustworthy same-origin destination - history.back');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpOrigin'], responseParams);
+
+    return induceForwardRequest(url, t, () => retrieve(key))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        });
+  }, 'sec-fetch-site - Not sent to non-trustworthy same-origin destination - history.forward');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpSameSite'], responseParams);
+
+    return induceBackRequest(url, t, () => retrieve(key))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        });
+  }, 'sec-fetch-site - Not sent to non-trustworthy same-site destination - history.back');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpSameSite'], responseParams);
+
+    return induceForwardRequest(url, t, () => retrieve(key))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        });
+  }, 'sec-fetch-site - Not sent to non-trustworthy same-site destination - history.forward');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpCrossSite'], responseParams);
+
+    return induceBackRequest(url, t, () => retrieve(key))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        });
+  }, 'sec-fetch-site - Not sent to non-trustworthy cross-site destination - history.back');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpCrossSite'], responseParams);
+
+    return induceForwardRequest(url, t, () => retrieve(key))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        });
+  }, 'sec-fetch-site - Not sent to non-trustworthy cross-site destination - history.forward');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpOrigin'], responseParams);
+
+    return induceBackRequest(url, t, () => retrieve(key))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-mode');
+        });
+  }, 'sec-fetch-mode - Not sent to non-trustworthy same-origin destination - history.back');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpOrigin'], responseParams);
+
+    return induceForwardRequest(url, t, () => retrieve(key))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-mode');
+        });
+  }, 'sec-fetch-mode - Not sent to non-trustworthy same-origin destination - history.forward');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpSameSite'], responseParams);
+
+    return induceBackRequest(url, t, () => retrieve(key))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-mode');
+        });
+  }, 'sec-fetch-mode - Not sent to non-trustworthy same-site destination - history.back');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpSameSite'], responseParams);
+
+    return induceForwardRequest(url, t, () => retrieve(key))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-mode');
+        });
+  }, 'sec-fetch-mode - Not sent to non-trustworthy same-site destination - history.forward');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpCrossSite'], responseParams);
+
+    return induceBackRequest(url, t, () => retrieve(key))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-mode');
+        });
+  }, 'sec-fetch-mode - Not sent to non-trustworthy cross-site destination - history.back');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpCrossSite'], responseParams);
+
+    return induceForwardRequest(url, t, () => retrieve(key))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-mode');
+        });
+  }, 'sec-fetch-mode - Not sent to non-trustworthy cross-site destination - history.forward');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpOrigin'], responseParams);
+
+    return induceBackRequest(url, t, () => retrieve(key))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-dest');
+        });
+  }, 'sec-fetch-dest - Not sent to non-trustworthy same-origin destination - history.back');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpOrigin'], responseParams);
+
+    return induceForwardRequest(url, t, () => retrieve(key))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-dest');
+        });
+  }, 'sec-fetch-dest - Not sent to non-trustworthy same-origin destination - history.forward');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpSameSite'], responseParams);
+
+    return induceBackRequest(url, t, () => retrieve(key))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-dest');
+        });
+  }, 'sec-fetch-dest - Not sent to non-trustworthy same-site destination - history.back');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpSameSite'], responseParams);
+
+    return induceForwardRequest(url, t, () => retrieve(key))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-dest');
+        });
+  }, 'sec-fetch-dest - Not sent to non-trustworthy same-site destination - history.forward');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpCrossSite'], responseParams);
+
+    return induceBackRequest(url, t, () => retrieve(key))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-dest');
+        });
+  }, 'sec-fetch-dest - Not sent to non-trustworthy cross-site destination - history.back');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpCrossSite'], responseParams);
+
+    return induceForwardRequest(url, t, () => retrieve(key))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-dest');
+        });
+  }, 'sec-fetch-dest - Not sent to non-trustworthy cross-site destination - history.forward');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpOrigin'], responseParams);
+
+    return induceBackRequest(url, t, () => retrieve(key))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user - Not sent to non-trustworthy same-origin destination - history.back');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpOrigin'], responseParams);
+
+    return induceForwardRequest(url, t, () => retrieve(key))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user - Not sent to non-trustworthy same-origin destination - history.forward');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpSameSite'], responseParams);
+
+    return induceBackRequest(url, t, () => retrieve(key))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user - Not sent to non-trustworthy same-site destination - history.back');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpSameSite'], responseParams);
+
+    return induceForwardRequest(url, t, () => retrieve(key))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user - Not sent to non-trustworthy same-site destination - history.forward');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpCrossSite'], responseParams);
+
+    return induceBackRequest(url, t, () => retrieve(key))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user - Not sent to non-trustworthy cross-site destination - history.back');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpCrossSite'], responseParams);
+
+    return induceForwardRequest(url, t, () => retrieve(key))
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user - Not sent to non-trustworthy cross-site destination - history.forward');
+  </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/fetch/metadata/generated/window-location.https.sub.html b/test/wpt/tests/fetch/metadata/generated/window-location.https.sub.html
new file mode 100644
index 00000000000..4a0d2fdc068
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/generated/window-location.https.sub.html
@@ -0,0 +1,1184 @@
+<!DOCTYPE html>
+<!--
+This test was procedurally generated. Please do not modify it directly.
+Sources:
+- fetch/metadata/tools/fetch-metadata.conf.yml
+- fetch/metadata/tools/templates/window-location.sub.html
+-->
+<html lang="en">
+  <meta charset="utf-8">
+  <meta name="timeout" content="long">
+  <title>HTTP headers on request for navigation via the HTML Location API</title>
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  <script src="/resources/testdriver.js"></script>
+  <script src="/resources/testdriver-vendor.js"></script>
+  <script src="/fetch/metadata/resources/helper.sub.js"></script>
+  <body>
+  <script>
+  'use strict';
+
+  function induceRequest(url, navigate, userActivated) {
+    const win = window.open();
+
+    return new Promise((resolve) => {
+        addEventListener('message', function(event) {
+          if (event.source === win) {
+            resolve();
+          }
+        });
+
+        if (userActivated) {
+          test_driver.bless('enable user activation', () => {
+            navigate(win, url);
+          });
+        } else {
+          navigate(win, url);
+        }
+      })
+      .then(() => win.close());
+  }
+
+  const responseParams = {
+    mime: 'text/html',
+    body: `<script>opener.postMessage('done', '*')</${''}script>`
+  };
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsOrigin'], responseParams);
+
+    const navigate = (win, path) => {
+      win.location = path;
+    };
+    return induceRequest(url, navigate, false)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-origin']);
+        });
+  }, 'sec-fetch-site - Same origin - location');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsOrigin'], responseParams);
+
+    const navigate = (win, path) => {
+      win.location.href = path;
+    };
+    return induceRequest(url, navigate, false)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-origin']);
+        });
+  }, 'sec-fetch-site - Same origin - location.href');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsOrigin'], responseParams);
+
+    const navigate = (win, path) => {
+      win.location.assign(path);
+    };
+    return induceRequest(url, navigate, false)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-origin']);
+        });
+  }, 'sec-fetch-site - Same origin - location.assign');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsOrigin'], responseParams);
+
+    const navigate = (win, path) => {
+      win.location.replace(path);
+    };
+    return induceRequest(url, navigate, false)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-origin']);
+        });
+  }, 'sec-fetch-site - Same origin - location.replace');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsCrossSite'], responseParams);
+
+    const navigate = (win, path) => {
+      win.location = path;
+    };
+    return induceRequest(url, navigate, false)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Cross-site - location');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsCrossSite'], responseParams);
+
+    const navigate = (win, path) => {
+      win.location.href = path;
+    };
+    return induceRequest(url, navigate, false)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Cross-site - location.href');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsCrossSite'], responseParams);
+
+    const navigate = (win, path) => {
+      win.location.assign(path);
+    };
+    return induceRequest(url, navigate, false)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Cross-site - location.assign');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsCrossSite'], responseParams);
+
+    const navigate = (win, path) => {
+      win.location.replace(path);
+    };
+    return induceRequest(url, navigate, false)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Cross-site - location.replace');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsSameSite'], responseParams);
+
+    const navigate = (win, path) => {
+      win.location = path;
+    };
+    return induceRequest(url, navigate, false)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - Same site - location');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsSameSite'], responseParams);
+
+    const navigate = (win, path) => {
+      win.location.href = path;
+    };
+    return induceRequest(url, navigate, false)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - Same site - location.href');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsSameSite'], responseParams);
+
+    const navigate = (win, path) => {
+      win.location.assign(path);
+    };
+    return induceRequest(url, navigate, false)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - Same site - location.assign');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsSameSite'], responseParams);
+
+    const navigate = (win, path) => {
+      win.location.replace(path);
+    };
+    return induceRequest(url, navigate, false)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - Same site - location.replace');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsOrigin', 'httpsCrossSite', 'httpsOrigin'], responseParams);
+
+    const navigate = (win, path) => {
+      win.location = path;
+    };
+    return induceRequest(url, navigate, false)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Same-Origin -> Cross-Site -> Same-Origin redirect - location');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsOrigin', 'httpsCrossSite', 'httpsOrigin'], responseParams);
+
+    const navigate = (win, path) => {
+      win.location.href = path;
+    };
+    return induceRequest(url, navigate, false)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Same-Origin -> Cross-Site -> Same-Origin redirect - location.href');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsOrigin', 'httpsCrossSite', 'httpsOrigin'], responseParams);
+
+    const navigate = (win, path) => {
+      win.location.assign(path);
+    };
+    return induceRequest(url, navigate, false)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Same-Origin -> Cross-Site -> Same-Origin redirect - location.assign');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsOrigin', 'httpsCrossSite', 'httpsOrigin'], responseParams);
+
+    const navigate = (win, path) => {
+      win.location.replace(path);
+    };
+    return induceRequest(url, navigate, false)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Same-Origin -> Cross-Site -> Same-Origin redirect - location.replace');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsOrigin', 'httpsSameSite', 'httpsOrigin'], responseParams);
+
+    const navigate = (win, path) => {
+      win.location = path;
+    };
+    return induceRequest(url, navigate, false)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - Same-Origin -> Same-Site -> Same-Origin redirect - location');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsOrigin', 'httpsSameSite', 'httpsOrigin'], responseParams);
+
+    const navigate = (win, path) => {
+      win.location.href = path;
+    };
+    return induceRequest(url, navigate, false)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - Same-Origin -> Same-Site -> Same-Origin redirect - location.href');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsOrigin', 'httpsSameSite', 'httpsOrigin'], responseParams);
+
+    const navigate = (win, path) => {
+      win.location.assign(path);
+    };
+    return induceRequest(url, navigate, false)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - Same-Origin -> Same-Site -> Same-Origin redirect - location.assign');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsOrigin', 'httpsSameSite', 'httpsOrigin'], responseParams);
+
+    const navigate = (win, path) => {
+      win.location.replace(path);
+    };
+    return induceRequest(url, navigate, false)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - Same-Origin -> Same-Site -> Same-Origin redirect - location.replace');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsCrossSite', 'httpsOrigin'], responseParams);
+
+    const navigate = (win, path) => {
+      win.location = path;
+    };
+    return induceRequest(url, navigate, false)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Cross-Site -> Same Origin - location');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsCrossSite', 'httpsOrigin'], responseParams);
+
+    const navigate = (win, path) => {
+      win.location.href = path;
+    };
+    return induceRequest(url, navigate, false)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Cross-Site -> Same Origin - location.href');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsCrossSite', 'httpsOrigin'], responseParams);
+
+    const navigate = (win, path) => {
+      win.location.assign(path);
+    };
+    return induceRequest(url, navigate, false)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Cross-Site -> Same Origin - location.assign');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsCrossSite', 'httpsOrigin'], responseParams);
+
+    const navigate = (win, path) => {
+      win.location.replace(path);
+    };
+    return induceRequest(url, navigate, false)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Cross-Site -> Same Origin - location.replace');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsCrossSite', 'httpsSameSite'], responseParams);
+
+    const navigate = (win, path) => {
+      win.location = path;
+    };
+    return induceRequest(url, navigate, false)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Cross-Site -> Same-Site - location');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsCrossSite', 'httpsSameSite'], responseParams);
+
+    const navigate = (win, path) => {
+      win.location.href = path;
+    };
+    return induceRequest(url, navigate, false)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Cross-Site -> Same-Site - location.href');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsCrossSite', 'httpsSameSite'], responseParams);
+
+    const navigate = (win, path) => {
+      win.location.assign(path);
+    };
+    return induceRequest(url, navigate, false)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Cross-Site -> Same-Site - location.assign');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsCrossSite', 'httpsSameSite'], responseParams);
+
+    const navigate = (win, path) => {
+      win.location.replace(path);
+    };
+    return induceRequest(url, navigate, false)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Cross-Site -> Same-Site - location.replace');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsCrossSite', 'httpsCrossSite'], responseParams);
+
+    const navigate = (win, path) => {
+      win.location = path;
+    };
+    return induceRequest(url, navigate, false)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Cross-Site -> Cross-Site - location');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsCrossSite', 'httpsCrossSite'], responseParams);
+
+    const navigate = (win, path) => {
+      win.location.href = path;
+    };
+    return induceRequest(url, navigate, false)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Cross-Site -> Cross-Site - location.href');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsCrossSite', 'httpsCrossSite'], responseParams);
+
+    const navigate = (win, path) => {
+      win.location.assign(path);
+    };
+    return induceRequest(url, navigate, false)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Cross-Site -> Cross-Site - location.assign');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsCrossSite', 'httpsCrossSite'], responseParams);
+
+    const navigate = (win, path) => {
+      win.location.replace(path);
+    };
+    return induceRequest(url, navigate, false)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Cross-Site -> Cross-Site - location.replace');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsOrigin', 'httpsOrigin'], responseParams);
+
+    const navigate = (win, path) => {
+      win.location = path;
+    };
+    return induceRequest(url, navigate, false)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-origin']);
+        });
+  }, 'sec-fetch-site - Same-Origin -> Same Origin - location');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsOrigin', 'httpsOrigin'], responseParams);
+
+    const navigate = (win, path) => {
+      win.location.href = path;
+    };
+    return induceRequest(url, navigate, false)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-origin']);
+        });
+  }, 'sec-fetch-site - Same-Origin -> Same Origin - location.href');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsOrigin', 'httpsOrigin'], responseParams);
+
+    const navigate = (win, path) => {
+      win.location.assign(path);
+    };
+    return induceRequest(url, navigate, false)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-origin']);
+        });
+  }, 'sec-fetch-site - Same-Origin -> Same Origin - location.assign');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsOrigin', 'httpsOrigin'], responseParams);
+
+    const navigate = (win, path) => {
+      win.location.replace(path);
+    };
+    return induceRequest(url, navigate, false)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-origin']);
+        });
+  }, 'sec-fetch-site - Same-Origin -> Same Origin - location.replace');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsOrigin', 'httpsSameSite'], responseParams);
+
+    const navigate = (win, path) => {
+      win.location = path;
+    };
+    return induceRequest(url, navigate, false)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - Same-Origin -> Same-Site - location');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsOrigin', 'httpsSameSite'], responseParams);
+
+    const navigate = (win, path) => {
+      win.location.href = path;
+    };
+    return induceRequest(url, navigate, false)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - Same-Origin -> Same-Site - location.href');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsOrigin', 'httpsSameSite'], responseParams);
+
+    const navigate = (win, path) => {
+      win.location.assign(path);
+    };
+    return induceRequest(url, navigate, false)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - Same-Origin -> Same-Site - location.assign');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsOrigin', 'httpsSameSite'], responseParams);
+
+    const navigate = (win, path) => {
+      win.location.replace(path);
+    };
+    return induceRequest(url, navigate, false)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - Same-Origin -> Same-Site - location.replace');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsOrigin', 'httpsCrossSite'], responseParams);
+
+    const navigate = (win, path) => {
+      win.location = path;
+    };
+    return induceRequest(url, navigate, false)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Same-Origin -> Cross-Site - location');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsOrigin', 'httpsCrossSite'], responseParams);
+
+    const navigate = (win, path) => {
+      win.location.href = path;
+    };
+    return induceRequest(url, navigate, false)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Same-Origin -> Cross-Site - location.href');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsOrigin', 'httpsCrossSite'], responseParams);
+
+    const navigate = (win, path) => {
+      win.location.assign(path);
+    };
+    return induceRequest(url, navigate, false)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Same-Origin -> Cross-Site - location.assign');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsOrigin', 'httpsCrossSite'], responseParams);
+
+    const navigate = (win, path) => {
+      win.location.replace(path);
+    };
+    return induceRequest(url, navigate, false)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Same-Origin -> Cross-Site - location.replace');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsSameSite', 'httpsOrigin'], responseParams);
+
+    const navigate = (win, path) => {
+      win.location = path;
+    };
+    return induceRequest(url, navigate, false)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - Same-Site -> Same Origin - location');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsSameSite', 'httpsOrigin'], responseParams);
+
+    const navigate = (win, path) => {
+      win.location.href = path;
+    };
+    return induceRequest(url, navigate, false)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - Same-Site -> Same Origin - location.href');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsSameSite', 'httpsOrigin'], responseParams);
+
+    const navigate = (win, path) => {
+      win.location.assign(path);
+    };
+    return induceRequest(url, navigate, false)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - Same-Site -> Same Origin - location.assign');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsSameSite', 'httpsOrigin'], responseParams);
+
+    const navigate = (win, path) => {
+      win.location.replace(path);
+    };
+    return induceRequest(url, navigate, false)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - Same-Site -> Same Origin - location.replace');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsSameSite', 'httpsSameSite'], responseParams);
+
+    const navigate = (win, path) => {
+      win.location = path;
+    };
+    return induceRequest(url, navigate, false)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - Same-Site -> Same-Site - location');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsSameSite', 'httpsSameSite'], responseParams);
+
+    const navigate = (win, path) => {
+      win.location.href = path;
+    };
+    return induceRequest(url, navigate, false)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - Same-Site -> Same-Site - location.href');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsSameSite', 'httpsSameSite'], responseParams);
+
+    const navigate = (win, path) => {
+      win.location.assign(path);
+    };
+    return induceRequest(url, navigate, false)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - Same-Site -> Same-Site - location.assign');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsSameSite', 'httpsSameSite'], responseParams);
+
+    const navigate = (win, path) => {
+      win.location.replace(path);
+    };
+    return induceRequest(url, navigate, false)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - Same-Site -> Same-Site - location.replace');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsSameSite', 'httpsCrossSite'], responseParams);
+
+    const navigate = (win, path) => {
+      win.location = path;
+    };
+    return induceRequest(url, navigate, false)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Same-Site -> Cross-Site - location');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsSameSite', 'httpsCrossSite'], responseParams);
+
+    const navigate = (win, path) => {
+      win.location.href = path;
+    };
+    return induceRequest(url, navigate, false)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Same-Site -> Cross-Site - location.href');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsSameSite', 'httpsCrossSite'], responseParams);
+
+    const navigate = (win, path) => {
+      win.location.assign(path);
+    };
+    return induceRequest(url, navigate, false)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Same-Site -> Cross-Site - location.assign');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsSameSite', 'httpsCrossSite'], responseParams);
+
+    const navigate = (win, path) => {
+      win.location.replace(path);
+    };
+    return induceRequest(url, navigate, false)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Same-Site -> Cross-Site - location.replace');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsOrigin', 'httpOrigin', 'httpsOrigin'], responseParams);
+
+    const navigate = (win, path) => {
+      win.location = path;
+    };
+    return induceRequest(url, navigate, false)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - HTTPS downgrade-upgrade - location');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsOrigin', 'httpOrigin', 'httpsOrigin'], responseParams);
+
+    const navigate = (win, path) => {
+      win.location.href = path;
+    };
+    return induceRequest(url, navigate, false)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - HTTPS downgrade-upgrade - location.href');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsOrigin', 'httpOrigin', 'httpsOrigin'], responseParams);
+
+    const navigate = (win, path) => {
+      win.location.assign(path);
+    };
+    return induceRequest(url, navigate, false)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - HTTPS downgrade-upgrade - location.assign');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsOrigin', 'httpOrigin', 'httpsOrigin'], responseParams);
+
+    const navigate = (win, path) => {
+      win.location.replace(path);
+    };
+    return induceRequest(url, navigate, false)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - HTTPS downgrade-upgrade - location.replace');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, [], responseParams);
+
+    const navigate = (win, path) => {
+      win.location = path;
+    };
+    return induceRequest(url, navigate, false)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-mode');
+          assert_array_equals(headers['sec-fetch-mode'], ['navigate']);
+        });
+  }, 'sec-fetch-mode - location');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, [], responseParams);
+
+    const navigate = (win, path) => {
+      win.location.href = path;
+    };
+    return induceRequest(url, navigate, false)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-mode');
+          assert_array_equals(headers['sec-fetch-mode'], ['navigate']);
+        });
+  }, 'sec-fetch-mode - location.href');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, [], responseParams);
+
+    const navigate = (win, path) => {
+      win.location.assign(path);
+    };
+    return induceRequest(url, navigate, false)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-mode');
+          assert_array_equals(headers['sec-fetch-mode'], ['navigate']);
+        });
+  }, 'sec-fetch-mode - location.assign');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, [], responseParams);
+
+    const navigate = (win, path) => {
+      win.location.replace(path);
+    };
+    return induceRequest(url, navigate, false)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-mode');
+          assert_array_equals(headers['sec-fetch-mode'], ['navigate']);
+        });
+  }, 'sec-fetch-mode - location.replace');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, [], responseParams);
+
+    const navigate = (win, path) => {
+      win.location = path;
+    };
+    return induceRequest(url, navigate, false)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-dest');
+          assert_array_equals(headers['sec-fetch-dest'], ['document']);
+        });
+  }, 'sec-fetch-dest - location');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, [], responseParams);
+
+    const navigate = (win, path) => {
+      win.location.href = path;
+    };
+    return induceRequest(url, navigate, false)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-dest');
+          assert_array_equals(headers['sec-fetch-dest'], ['document']);
+        });
+  }, 'sec-fetch-dest - location.href');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, [], responseParams);
+
+    const navigate = (win, path) => {
+      win.location.assign(path);
+    };
+    return induceRequest(url, navigate, false)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-dest');
+          assert_array_equals(headers['sec-fetch-dest'], ['document']);
+        });
+  }, 'sec-fetch-dest - location.assign');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, [], responseParams);
+
+    const navigate = (win, path) => {
+      win.location.replace(path);
+    };
+    return induceRequest(url, navigate, false)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-dest');
+          assert_array_equals(headers['sec-fetch-dest'], ['document']);
+        });
+  }, 'sec-fetch-dest - location.replace');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, [], responseParams);
+
+    const navigate = (win, path) => {
+      win.location = path;
+    };
+    return induceRequest(url, navigate, false)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user - location');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, [], responseParams);
+
+    const navigate = (win, path) => {
+      win.location.href = path;
+    };
+    return induceRequest(url, navigate, false)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user - location.href');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, [], responseParams);
+
+    const navigate = (win, path) => {
+      win.location.assign(path);
+    };
+    return induceRequest(url, navigate, false)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user - location.assign');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, [], responseParams);
+
+    const navigate = (win, path) => {
+      win.location.replace(path);
+    };
+    return induceRequest(url, navigate, false)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user - location.replace');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, [], responseParams);
+
+    const navigate = (win, path) => {
+      win.location = path;
+    };
+    return induceRequest(url, navigate, true)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-user');
+          assert_array_equals(headers['sec-fetch-user'], ['?1']);
+        });
+  }, 'sec-fetch-user - location with user activation');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, [], responseParams);
+
+    const navigate = (win, path) => {
+      win.location.href = path;
+    };
+    return induceRequest(url, navigate, true)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-user');
+          assert_array_equals(headers['sec-fetch-user'], ['?1']);
+        });
+  }, 'sec-fetch-user - location.href with user activation');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, [], responseParams);
+
+    const navigate = (win, path) => {
+      win.location.assign(path);
+    };
+    return induceRequest(url, navigate, true)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-user');
+          assert_array_equals(headers['sec-fetch-user'], ['?1']);
+        });
+  }, 'sec-fetch-user - location.assign with user activation');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, [], responseParams);
+
+    const navigate = (win, path) => {
+      win.location.replace(path);
+    };
+    return induceRequest(url, navigate, true)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-user');
+          assert_array_equals(headers['sec-fetch-user'], ['?1']);
+        });
+  }, 'sec-fetch-user - location.replace with user activation');
+  </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/fetch/metadata/generated/window-location.sub.html b/test/wpt/tests/fetch/metadata/generated/window-location.sub.html
new file mode 100644
index 00000000000..bb3e6805cb0
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/generated/window-location.sub.html
@@ -0,0 +1,894 @@
+<!DOCTYPE html>
+<!--
+This test was procedurally generated. Please do not modify it directly.
+Sources:
+- fetch/metadata/tools/fetch-metadata.conf.yml
+- fetch/metadata/tools/templates/window-location.sub.html
+-->
+<html lang="en">
+  <meta charset="utf-8">
+  <meta name="timeout" content="long">
+  <title>HTTP headers on request for navigation via the HTML Location API</title>
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  <script src="/fetch/metadata/resources/helper.sub.js"></script>
+  <body>
+  <script>
+  'use strict';
+
+  function induceRequest(url, navigate, userActivated) {
+    const win = window.open();
+
+    return new Promise((resolve) => {
+        addEventListener('message', function(event) {
+          if (event.source === win) {
+            resolve();
+          }
+        });
+
+        if (userActivated) {
+          test_driver.bless('enable user activation', () => {
+            navigate(win, url);
+          });
+        } else {
+          navigate(win, url);
+        }
+      })
+      .then(() => win.close());
+  }
+
+  const responseParams = {
+    mime: 'text/html',
+    body: `<script>opener.postMessage('done', '*')</${''}script>`
+  };
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpOrigin'], responseParams);
+
+    const navigate = (win, path) => {
+      win.location = path;
+    };
+    return induceRequest(url, navigate, false)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        });
+  }, 'sec-fetch-site - Not sent to non-trustworthy same-origin destination - location');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpOrigin'], responseParams);
+
+    const navigate = (win, path) => {
+      win.location.href = path;
+    };
+    return induceRequest(url, navigate, false)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        });
+  }, 'sec-fetch-site - Not sent to non-trustworthy same-origin destination - location.href');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpOrigin'], responseParams);
+
+    const navigate = (win, path) => {
+      win.location.assign(path);
+    };
+    return induceRequest(url, navigate, false)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        });
+  }, 'sec-fetch-site - Not sent to non-trustworthy same-origin destination - location.assign');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpOrigin'], responseParams);
+
+    const navigate = (win, path) => {
+      win.location.replace(path);
+    };
+    return induceRequest(url, navigate, false)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        });
+  }, 'sec-fetch-site - Not sent to non-trustworthy same-origin destination - location.replace');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpSameSite'], responseParams);
+
+    const navigate = (win, path) => {
+      win.location = path;
+    };
+    return induceRequest(url, navigate, false)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        });
+  }, 'sec-fetch-site - Not sent to non-trustworthy same-site destination - location');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpSameSite'], responseParams);
+
+    const navigate = (win, path) => {
+      win.location.href = path;
+    };
+    return induceRequest(url, navigate, false)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        });
+  }, 'sec-fetch-site - Not sent to non-trustworthy same-site destination - location.href');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpSameSite'], responseParams);
+
+    const navigate = (win, path) => {
+      win.location.assign(path);
+    };
+    return induceRequest(url, navigate, false)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        });
+  }, 'sec-fetch-site - Not sent to non-trustworthy same-site destination - location.assign');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpSameSite'], responseParams);
+
+    const navigate = (win, path) => {
+      win.location.replace(path);
+    };
+    return induceRequest(url, navigate, false)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        });
+  }, 'sec-fetch-site - Not sent to non-trustworthy same-site destination - location.replace');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpCrossSite'], responseParams);
+
+    const navigate = (win, path) => {
+      win.location = path;
+    };
+    return induceRequest(url, navigate, false)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        });
+  }, 'sec-fetch-site - Not sent to non-trustworthy cross-site destination - location');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpCrossSite'], responseParams);
+
+    const navigate = (win, path) => {
+      win.location.href = path;
+    };
+    return induceRequest(url, navigate, false)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        });
+  }, 'sec-fetch-site - Not sent to non-trustworthy cross-site destination - location.href');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpCrossSite'], responseParams);
+
+    const navigate = (win, path) => {
+      win.location.assign(path);
+    };
+    return induceRequest(url, navigate, false)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        });
+  }, 'sec-fetch-site - Not sent to non-trustworthy cross-site destination - location.assign');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpCrossSite'], responseParams);
+
+    const navigate = (win, path) => {
+      win.location.replace(path);
+    };
+    return induceRequest(url, navigate, false)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        });
+  }, 'sec-fetch-site - Not sent to non-trustworthy cross-site destination - location.replace');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpOrigin'], responseParams);
+
+    const navigate = (win, path) => {
+      win.location = path;
+    };
+    return induceRequest(url, navigate, false)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-mode');
+        });
+  }, 'sec-fetch-mode - Not sent to non-trustworthy same-origin destination - location');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpOrigin'], responseParams);
+
+    const navigate = (win, path) => {
+      win.location.href = path;
+    };
+    return induceRequest(url, navigate, false)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-mode');
+        });
+  }, 'sec-fetch-mode - Not sent to non-trustworthy same-origin destination - location.href');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpOrigin'], responseParams);
+
+    const navigate = (win, path) => {
+      win.location.assign(path);
+    };
+    return induceRequest(url, navigate, false)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-mode');
+        });
+  }, 'sec-fetch-mode - Not sent to non-trustworthy same-origin destination - location.assign');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpOrigin'], responseParams);
+
+    const navigate = (win, path) => {
+      win.location.replace(path);
+    };
+    return induceRequest(url, navigate, false)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-mode');
+        });
+  }, 'sec-fetch-mode - Not sent to non-trustworthy same-origin destination - location.replace');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpSameSite'], responseParams);
+
+    const navigate = (win, path) => {
+      win.location = path;
+    };
+    return induceRequest(url, navigate, false)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-mode');
+        });
+  }, 'sec-fetch-mode - Not sent to non-trustworthy same-site destination - location');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpSameSite'], responseParams);
+
+    const navigate = (win, path) => {
+      win.location.href = path;
+    };
+    return induceRequest(url, navigate, false)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-mode');
+        });
+  }, 'sec-fetch-mode - Not sent to non-trustworthy same-site destination - location.href');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpSameSite'], responseParams);
+
+    const navigate = (win, path) => {
+      win.location.assign(path);
+    };
+    return induceRequest(url, navigate, false)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-mode');
+        });
+  }, 'sec-fetch-mode - Not sent to non-trustworthy same-site destination - location.assign');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpSameSite'], responseParams);
+
+    const navigate = (win, path) => {
+      win.location.replace(path);
+    };
+    return induceRequest(url, navigate, false)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-mode');
+        });
+  }, 'sec-fetch-mode - Not sent to non-trustworthy same-site destination - location.replace');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpCrossSite'], responseParams);
+
+    const navigate = (win, path) => {
+      win.location = path;
+    };
+    return induceRequest(url, navigate, false)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-mode');
+        });
+  }, 'sec-fetch-mode - Not sent to non-trustworthy cross-site destination - location');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpCrossSite'], responseParams);
+
+    const navigate = (win, path) => {
+      win.location.href = path;
+    };
+    return induceRequest(url, navigate, false)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-mode');
+        });
+  }, 'sec-fetch-mode - Not sent to non-trustworthy cross-site destination - location.href');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpCrossSite'], responseParams);
+
+    const navigate = (win, path) => {
+      win.location.assign(path);
+    };
+    return induceRequest(url, navigate, false)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-mode');
+        });
+  }, 'sec-fetch-mode - Not sent to non-trustworthy cross-site destination - location.assign');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpCrossSite'], responseParams);
+
+    const navigate = (win, path) => {
+      win.location.replace(path);
+    };
+    return induceRequest(url, navigate, false)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-mode');
+        });
+  }, 'sec-fetch-mode - Not sent to non-trustworthy cross-site destination - location.replace');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpOrigin'], responseParams);
+
+    const navigate = (win, path) => {
+      win.location = path;
+    };
+    return induceRequest(url, navigate, false)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-dest');
+        });
+  }, 'sec-fetch-dest - Not sent to non-trustworthy same-origin destination - location');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpOrigin'], responseParams);
+
+    const navigate = (win, path) => {
+      win.location.href = path;
+    };
+    return induceRequest(url, navigate, false)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-dest');
+        });
+  }, 'sec-fetch-dest - Not sent to non-trustworthy same-origin destination - location.href');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpOrigin'], responseParams);
+
+    const navigate = (win, path) => {
+      win.location.assign(path);
+    };
+    return induceRequest(url, navigate, false)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-dest');
+        });
+  }, 'sec-fetch-dest - Not sent to non-trustworthy same-origin destination - location.assign');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpOrigin'], responseParams);
+
+    const navigate = (win, path) => {
+      win.location.replace(path);
+    };
+    return induceRequest(url, navigate, false)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-dest');
+        });
+  }, 'sec-fetch-dest - Not sent to non-trustworthy same-origin destination - location.replace');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpSameSite'], responseParams);
+
+    const navigate = (win, path) => {
+      win.location = path;
+    };
+    return induceRequest(url, navigate, false)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-dest');
+        });
+  }, 'sec-fetch-dest - Not sent to non-trustworthy same-site destination - location');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpSameSite'], responseParams);
+
+    const navigate = (win, path) => {
+      win.location.href = path;
+    };
+    return induceRequest(url, navigate, false)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-dest');
+        });
+  }, 'sec-fetch-dest - Not sent to non-trustworthy same-site destination - location.href');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpSameSite'], responseParams);
+
+    const navigate = (win, path) => {
+      win.location.assign(path);
+    };
+    return induceRequest(url, navigate, false)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-dest');
+        });
+  }, 'sec-fetch-dest - Not sent to non-trustworthy same-site destination - location.assign');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpSameSite'], responseParams);
+
+    const navigate = (win, path) => {
+      win.location.replace(path);
+    };
+    return induceRequest(url, navigate, false)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-dest');
+        });
+  }, 'sec-fetch-dest - Not sent to non-trustworthy same-site destination - location.replace');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpCrossSite'], responseParams);
+
+    const navigate = (win, path) => {
+      win.location = path;
+    };
+    return induceRequest(url, navigate, false)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-dest');
+        });
+  }, 'sec-fetch-dest - Not sent to non-trustworthy cross-site destination - location');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpCrossSite'], responseParams);
+
+    const navigate = (win, path) => {
+      win.location.href = path;
+    };
+    return induceRequest(url, navigate, false)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-dest');
+        });
+  }, 'sec-fetch-dest - Not sent to non-trustworthy cross-site destination - location.href');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpCrossSite'], responseParams);
+
+    const navigate = (win, path) => {
+      win.location.assign(path);
+    };
+    return induceRequest(url, navigate, false)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-dest');
+        });
+  }, 'sec-fetch-dest - Not sent to non-trustworthy cross-site destination - location.assign');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpCrossSite'], responseParams);
+
+    const navigate = (win, path) => {
+      win.location.replace(path);
+    };
+    return induceRequest(url, navigate, false)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-dest');
+        });
+  }, 'sec-fetch-dest - Not sent to non-trustworthy cross-site destination - location.replace');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpOrigin'], responseParams);
+
+    const navigate = (win, path) => {
+      win.location = path;
+    };
+    return induceRequest(url, navigate, false)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user - Not sent to non-trustworthy same-origin destination - location');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpOrigin'], responseParams);
+
+    const navigate = (win, path) => {
+      win.location.href = path;
+    };
+    return induceRequest(url, navigate, false)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user - Not sent to non-trustworthy same-origin destination - location.href');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpOrigin'], responseParams);
+
+    const navigate = (win, path) => {
+      win.location.assign(path);
+    };
+    return induceRequest(url, navigate, false)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user - Not sent to non-trustworthy same-origin destination - location.assign');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpOrigin'], responseParams);
+
+    const navigate = (win, path) => {
+      win.location.replace(path);
+    };
+    return induceRequest(url, navigate, false)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user - Not sent to non-trustworthy same-origin destination - location.replace');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpSameSite'], responseParams);
+
+    const navigate = (win, path) => {
+      win.location = path;
+    };
+    return induceRequest(url, navigate, false)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user - Not sent to non-trustworthy same-site destination - location');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpSameSite'], responseParams);
+
+    const navigate = (win, path) => {
+      win.location.href = path;
+    };
+    return induceRequest(url, navigate, false)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user - Not sent to non-trustworthy same-site destination - location.href');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpSameSite'], responseParams);
+
+    const navigate = (win, path) => {
+      win.location.assign(path);
+    };
+    return induceRequest(url, navigate, false)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user - Not sent to non-trustworthy same-site destination - location.assign');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpSameSite'], responseParams);
+
+    const navigate = (win, path) => {
+      win.location.replace(path);
+    };
+    return induceRequest(url, navigate, false)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user - Not sent to non-trustworthy same-site destination - location.replace');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpCrossSite'], responseParams);
+
+    const navigate = (win, path) => {
+      win.location = path;
+    };
+    return induceRequest(url, navigate, false)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user - Not sent to non-trustworthy cross-site destination - location');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpCrossSite'], responseParams);
+
+    const navigate = (win, path) => {
+      win.location.href = path;
+    };
+    return induceRequest(url, navigate, false)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user - Not sent to non-trustworthy cross-site destination - location.href');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpCrossSite'], responseParams);
+
+    const navigate = (win, path) => {
+      win.location.assign(path);
+    };
+    return induceRequest(url, navigate, false)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user - Not sent to non-trustworthy cross-site destination - location.assign');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpCrossSite'], responseParams);
+
+    const navigate = (win, path) => {
+      win.location.replace(path);
+    };
+    return induceRequest(url, navigate, false)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user - Not sent to non-trustworthy cross-site destination - location.replace');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsOrigin', 'httpOrigin'], responseParams);
+
+    const navigate = (win, path) => {
+      win.location = path;
+    };
+    return induceRequest(url, navigate, false)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        });
+  }, 'sec-fetch-site - HTTPS downgrade (header not sent) - location');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsOrigin', 'httpOrigin'], responseParams);
+
+    const navigate = (win, path) => {
+      win.location.href = path;
+    };
+    return induceRequest(url, navigate, false)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        });
+  }, 'sec-fetch-site - HTTPS downgrade (header not sent) - location.href');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsOrigin', 'httpOrigin'], responseParams);
+
+    const navigate = (win, path) => {
+      win.location.assign(path);
+    };
+    return induceRequest(url, navigate, false)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        });
+  }, 'sec-fetch-site - HTTPS downgrade (header not sent) - location.assign');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsOrigin', 'httpOrigin'], responseParams);
+
+    const navigate = (win, path) => {
+      win.location.replace(path);
+    };
+    return induceRequest(url, navigate, false)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        });
+  }, 'sec-fetch-site - HTTPS downgrade (header not sent) - location.replace');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpOrigin', 'httpsOrigin'], responseParams);
+
+    const navigate = (win, path) => {
+      win.location = path;
+    };
+    return induceRequest(url, navigate, false)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - HTTPS upgrade - location');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpOrigin', 'httpsOrigin'], responseParams);
+
+    const navigate = (win, path) => {
+      win.location.href = path;
+    };
+    return induceRequest(url, navigate, false)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - HTTPS upgrade - location.href');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpOrigin', 'httpsOrigin'], responseParams);
+
+    const navigate = (win, path) => {
+      win.location.assign(path);
+    };
+    return induceRequest(url, navigate, false)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - HTTPS upgrade - location.assign');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpOrigin', 'httpsOrigin'], responseParams);
+
+    const navigate = (win, path) => {
+      win.location.replace(path);
+    };
+    return induceRequest(url, navigate, false)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - HTTPS upgrade - location.replace');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsOrigin', 'httpOrigin', 'httpsOrigin'], responseParams);
+
+    const navigate = (win, path) => {
+      win.location = path;
+    };
+    return induceRequest(url, navigate, false)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - HTTPS downgrade-upgrade - location');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsOrigin', 'httpOrigin', 'httpsOrigin'], responseParams);
+
+    const navigate = (win, path) => {
+      win.location.href = path;
+    };
+    return induceRequest(url, navigate, false)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - HTTPS downgrade-upgrade - location.href');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsOrigin', 'httpOrigin', 'httpsOrigin'], responseParams);
+
+    const navigate = (win, path) => {
+      win.location.assign(path);
+    };
+    return induceRequest(url, navigate, false)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - HTTPS downgrade-upgrade - location.assign');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, ['httpsOrigin', 'httpOrigin', 'httpsOrigin'], responseParams);
+
+    const navigate = (win, path) => {
+      win.location.replace(path);
+    };
+    return induceRequest(url, navigate, false)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - HTTPS downgrade-upgrade - location.replace');
+  </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/fetch/metadata/generated/worker-dedicated-constructor.https.sub.html b/test/wpt/tests/fetch/metadata/generated/worker-dedicated-constructor.https.sub.html
new file mode 100644
index 00000000000..86f17607554
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/generated/worker-dedicated-constructor.https.sub.html
@@ -0,0 +1,118 @@
+<!DOCTYPE html>
+<!--
+This test was procedurally generated. Please do not modify it directly.
+Sources:
+- fetch/metadata/tools/fetch-metadata.conf.yml
+- fetch/metadata/tools/templates/worker-dedicated-constructor.sub.html
+-->
+<html lang="en">
+  <meta charset="utf-8">
+  <title>HTTP headers on request for dedicated worker via the "Worker" constructor</title>
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  <script src="/fetch/metadata/resources/helper.sub.js"></script>
+  <script type="module">
+  'use strict';
+  function induceRequest(url, options) {
+    return new Promise((resolve, reject) => {
+      const worker = new Worker(url, options);
+      worker.onmessage = resolve;
+      worker.onerror = reject;
+    });
+  }
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key,
+      [],
+      { mime: 'application/javascript', body: 'postMessage("")' }
+    );
+
+    return induceRequest(url)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-mode');
+          assert_array_equals(headers['sec-fetch-mode'], ['same-origin']);
+        });
+  }, 'sec-fetch-mode - no options');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key,
+      [],
+      { mime: 'application/javascript', body: 'postMessage("")' }
+    );
+
+    return induceRequest(url, {"type": "module"})
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-mode');
+          assert_array_equals(headers['sec-fetch-mode'], ['same-origin']);
+        });
+  }, 'sec-fetch-mode - options: type=module');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key,
+      [],
+      { mime: 'application/javascript', body: 'postMessage("")' }
+    );
+
+    return induceRequest(url)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-dest');
+          assert_array_equals(headers['sec-fetch-dest'], ['worker']);
+        });
+  }, 'sec-fetch-dest - no options');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key,
+      [],
+      { mime: 'application/javascript', body: 'postMessage("")' }
+    );
+
+    return induceRequest(url, {"type": "module"})
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-dest');
+          assert_array_equals(headers['sec-fetch-dest'], ['worker']);
+        });
+  }, 'sec-fetch-dest - options: type=module');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key,
+      [],
+      { mime: 'application/javascript', body: 'postMessage("")' }
+    );
+
+    return induceRequest(url)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user - no options');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key,
+      [],
+      { mime: 'application/javascript', body: 'postMessage("")' }
+    );
+
+    return induceRequest(url, {"type": "module"})
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user - options: type=module');
+  </script>
+</html>
diff --git a/test/wpt/tests/fetch/metadata/generated/worker-dedicated-constructor.sub.html b/test/wpt/tests/fetch/metadata/generated/worker-dedicated-constructor.sub.html
new file mode 100644
index 00000000000..69ac7682a5c
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/generated/worker-dedicated-constructor.sub.html
@@ -0,0 +1,204 @@
+<!DOCTYPE html>
+<!--
+This test was procedurally generated. Please do not modify it directly.
+Sources:
+- fetch/metadata/tools/fetch-metadata.conf.yml
+- fetch/metadata/tools/templates/worker-dedicated-constructor.sub.html
+-->
+<html lang="en">
+  <meta charset="utf-8">
+  <title>HTTP headers on request for dedicated worker via the "Worker" constructor</title>
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  <script src="/fetch/metadata/resources/helper.sub.js"></script>
+  <script type="module">
+  'use strict';
+  function induceRequest(url, options) {
+    return new Promise((resolve, reject) => {
+      const worker = new Worker(url, options);
+      worker.onmessage = resolve;
+      worker.onerror = reject;
+    });
+  }
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key,
+      ['httpOrigin'],
+      { mime: 'application/javascript', body: 'postMessage("")' }
+    );
+
+    return induceRequest(url)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        });
+  }, 'sec-fetch-site - Not sent to non-trustworthy same-origin destination, no options');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key,
+      ['httpSameSite'],
+      { mime: 'application/javascript', body: 'postMessage("")' }
+    );
+
+    return induceRequest(url)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        });
+  }, 'sec-fetch-site - Not sent to non-trustworthy same-site destination, no options');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key,
+      ['httpCrossSite'],
+      { mime: 'application/javascript', body: 'postMessage("")' }
+    );
+
+    return induceRequest(url)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        });
+  }, 'sec-fetch-site - Not sent to non-trustworthy cross-site destination, no options');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key,
+      ['httpOrigin'],
+      { mime: 'application/javascript', body: 'postMessage("")' }
+    );
+
+    return induceRequest(url)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-mode');
+        });
+  }, 'sec-fetch-mode - Not sent to non-trustworthy same-origin destination, no options');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key,
+      ['httpSameSite'],
+      { mime: 'application/javascript', body: 'postMessage("")' }
+    );
+
+    return induceRequest(url)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-mode');
+        });
+  }, 'sec-fetch-mode - Not sent to non-trustworthy same-site destination, no options');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key,
+      ['httpCrossSite'],
+      { mime: 'application/javascript', body: 'postMessage("")' }
+    );
+
+    return induceRequest(url)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-mode');
+        });
+  }, 'sec-fetch-mode - Not sent to non-trustworthy cross-site destination, no options');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key,
+      ['httpOrigin'],
+      { mime: 'application/javascript', body: 'postMessage("")' }
+    );
+
+    return induceRequest(url)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-dest');
+        });
+  }, 'sec-fetch-dest - Not sent to non-trustworthy same-origin destination, no options');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key,
+      ['httpSameSite'],
+      { mime: 'application/javascript', body: 'postMessage("")' }
+    );
+
+    return induceRequest(url)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-dest');
+        });
+  }, 'sec-fetch-dest - Not sent to non-trustworthy same-site destination, no options');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key,
+      ['httpCrossSite'],
+      { mime: 'application/javascript', body: 'postMessage("")' }
+    );
+
+    return induceRequest(url)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-dest');
+        });
+  }, 'sec-fetch-dest - Not sent to non-trustworthy cross-site destination, no options');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key,
+      ['httpOrigin'],
+      { mime: 'application/javascript', body: 'postMessage("")' }
+    );
+
+    return induceRequest(url)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user - Not sent to non-trustworthy same-origin destination, no options');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key,
+      ['httpSameSite'],
+      { mime: 'application/javascript', body: 'postMessage("")' }
+    );
+
+    return induceRequest(url)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user - Not sent to non-trustworthy same-site destination, no options');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key,
+      ['httpCrossSite'],
+      { mime: 'application/javascript', body: 'postMessage("")' }
+    );
+
+    return induceRequest(url)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user - Not sent to non-trustworthy cross-site destination, no options');
+  </script>
+</html>
diff --git a/test/wpt/tests/fetch/metadata/generated/worker-dedicated-importscripts.https.sub.html b/test/wpt/tests/fetch/metadata/generated/worker-dedicated-importscripts.https.sub.html
new file mode 100644
index 00000000000..0cd9f35d582
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/generated/worker-dedicated-importscripts.https.sub.html
@@ -0,0 +1,268 @@
+<!DOCTYPE html>
+<!--
+This test was procedurally generated. Please do not modify it directly.
+Sources:
+- fetch/metadata/tools/fetch-metadata.conf.yml
+- fetch/metadata/tools/templates/worker-dedicated-importscripts.sub.html
+-->
+<html lang="en">
+  <meta charset="utf-8">
+  <title>HTTP headers on request for dedicated worker via the "importScripts" API</title>
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  <script src="/fetch/metadata/resources/helper.sub.js"></script>
+  <script type="module">
+  'use strict';
+  function induceRequest(url, options) {
+    const src = `
+      importScripts('${url}');
+      postMessage('done');
+    `;
+    const workerUrl = URL.createObjectURL(
+      new Blob([src], { type: 'application/javascript' })
+    );
+    return new Promise((resolve, reject) => {
+      const worker = new Worker(workerUrl, options);
+      worker.onmessage = resolve;
+      worker.onerror = reject;
+    });
+  }
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, ['httpsOrigin'], { mime: 'application/javascript' }
+    );
+
+    return induceRequest(url)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-origin']);
+        });
+  }, 'sec-fetch-site - Same origin');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, ['httpsCrossSite'], { mime: 'application/javascript' }
+    );
+
+    return induceRequest(url)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Cross-site');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, ['httpsSameSite'], { mime: 'application/javascript' }
+    );
+
+    return induceRequest(url)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - Same site');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, ['httpsOrigin', 'httpsCrossSite', 'httpsOrigin'], { mime: 'application/javascript' }
+    );
+
+    return induceRequest(url)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Same-Origin -> Cross-Site -> Same-Origin redirect');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, ['httpsOrigin', 'httpsSameSite', 'httpsOrigin'], { mime: 'application/javascript' }
+    );
+
+    return induceRequest(url)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - Same-Origin -> Same-Site -> Same-Origin redirect');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, ['httpsCrossSite', 'httpsOrigin'], { mime: 'application/javascript' }
+    );
+
+    return induceRequest(url)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Cross-Site -> Same Origin');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, ['httpsCrossSite', 'httpsSameSite'], { mime: 'application/javascript' }
+    );
+
+    return induceRequest(url)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Cross-Site -> Same-Site');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, ['httpsCrossSite', 'httpsCrossSite'], { mime: 'application/javascript' }
+    );
+
+    return induceRequest(url)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Cross-Site -> Cross-Site');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, ['httpsOrigin', 'httpsOrigin'], { mime: 'application/javascript' }
+    );
+
+    return induceRequest(url)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-origin']);
+        });
+  }, 'sec-fetch-site - Same-Origin -> Same Origin');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, ['httpsOrigin', 'httpsSameSite'], { mime: 'application/javascript' }
+    );
+
+    return induceRequest(url)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - Same-Origin -> Same-Site');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, ['httpsOrigin', 'httpsCrossSite'], { mime: 'application/javascript' }
+    );
+
+    return induceRequest(url)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Same-Origin -> Cross-Site');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, ['httpsSameSite', 'httpsOrigin'], { mime: 'application/javascript' }
+    );
+
+    return induceRequest(url)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - Same-Site -> Same Origin');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, ['httpsSameSite', 'httpsSameSite'], { mime: 'application/javascript' }
+    );
+
+    return induceRequest(url)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['same-site']);
+        });
+  }, 'sec-fetch-site - Same-Site -> Same-Site');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, ['httpsSameSite', 'httpsCrossSite'], { mime: 'application/javascript' }
+    );
+
+    return induceRequest(url)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - Same-Site -> Cross-Site');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, [], { mime: 'application/javascript' }
+    );
+
+    return induceRequest(url)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-mode');
+          assert_array_equals(headers['sec-fetch-mode'], ['no-cors']);
+        });
+  }, 'sec-fetch-mode');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, [], { mime: 'application/javascript' }
+    );
+
+    return induceRequest(url)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-dest');
+          assert_array_equals(headers['sec-fetch-dest'], ['script']);
+        });
+  }, 'sec-fetch-dest');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, [], { mime: 'application/javascript' }
+    );
+
+    return induceRequest(url)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user');
+  </script>
+</html>
diff --git a/test/wpt/tests/fetch/metadata/generated/worker-dedicated-importscripts.sub.html b/test/wpt/tests/fetch/metadata/generated/worker-dedicated-importscripts.sub.html
new file mode 100644
index 00000000000..0555bbaf432
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/generated/worker-dedicated-importscripts.sub.html
@@ -0,0 +1,228 @@
+<!DOCTYPE html>
+<!--
+This test was procedurally generated. Please do not modify it directly.
+Sources:
+- fetch/metadata/tools/fetch-metadata.conf.yml
+- fetch/metadata/tools/templates/worker-dedicated-importscripts.sub.html
+-->
+<html lang="en">
+  <meta charset="utf-8">
+  <title>HTTP headers on request for dedicated worker via the "importScripts" API</title>
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  <script src="/fetch/metadata/resources/helper.sub.js"></script>
+  <script type="module">
+  'use strict';
+  function induceRequest(url, options) {
+    const src = `
+      importScripts('${url}');
+      postMessage('done');
+    `;
+    const workerUrl = URL.createObjectURL(
+      new Blob([src], { type: 'application/javascript' })
+    );
+    return new Promise((resolve, reject) => {
+      const worker = new Worker(workerUrl, options);
+      worker.onmessage = resolve;
+      worker.onerror = reject;
+    });
+  }
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, ['httpOrigin'], { mime: 'application/javascript' }
+    );
+
+    return induceRequest(url)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        });
+  }, 'sec-fetch-site - Not sent to non-trustworthy same-origin destination');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, ['httpSameSite'], { mime: 'application/javascript' }
+    );
+
+    return induceRequest(url)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        });
+  }, 'sec-fetch-site - Not sent to non-trustworthy same-site destination');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, ['httpCrossSite'], { mime: 'application/javascript' }
+    );
+
+    return induceRequest(url)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        });
+  }, 'sec-fetch-site - Not sent to non-trustworthy cross-site destination');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, ['httpOrigin'], { mime: 'application/javascript' }
+    );
+
+    return induceRequest(url)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-mode');
+        });
+  }, 'sec-fetch-mode - Not sent to non-trustworthy same-origin destination');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, ['httpSameSite'], { mime: 'application/javascript' }
+    );
+
+    return induceRequest(url)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-mode');
+        });
+  }, 'sec-fetch-mode - Not sent to non-trustworthy same-site destination');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, ['httpCrossSite'], { mime: 'application/javascript' }
+    );
+
+    return induceRequest(url)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-mode');
+        });
+  }, 'sec-fetch-mode - Not sent to non-trustworthy cross-site destination');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, ['httpOrigin'], { mime: 'application/javascript' }
+    );
+
+    return induceRequest(url)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-dest');
+        });
+  }, 'sec-fetch-dest - Not sent to non-trustworthy same-origin destination');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, ['httpSameSite'], { mime: 'application/javascript' }
+    );
+
+    return induceRequest(url)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-dest');
+        });
+  }, 'sec-fetch-dest - Not sent to non-trustworthy same-site destination');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, ['httpCrossSite'], { mime: 'application/javascript' }
+    );
+
+    return induceRequest(url)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-dest');
+        });
+  }, 'sec-fetch-dest - Not sent to non-trustworthy cross-site destination');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, ['httpOrigin'], { mime: 'application/javascript' }
+    );
+
+    return induceRequest(url)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user - Not sent to non-trustworthy same-origin destination');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, ['httpSameSite'], { mime: 'application/javascript' }
+    );
+
+    return induceRequest(url)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user - Not sent to non-trustworthy same-site destination');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, ['httpCrossSite'], { mime: 'application/javascript' }
+    );
+
+    return induceRequest(url)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-user');
+        });
+  }, 'sec-fetch-user - Not sent to non-trustworthy cross-site destination');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, ['httpsOrigin', 'httpOrigin'], { mime: 'application/javascript' }
+    );
+
+    return induceRequest(url)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_not_own_property(headers, 'sec-fetch-site');
+        });
+  }, 'sec-fetch-site - HTTPS downgrade (header not sent)');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, ['httpOrigin', 'httpsOrigin'], { mime: 'application/javascript' }
+    );
+
+    return induceRequest(url)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - HTTPS upgrade');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, ['httpsOrigin', 'httpOrigin', 'httpsOrigin'], { mime: 'application/javascript' }
+    );
+
+    return induceRequest(url)
+      .then(() => retrieve(key))
+      .then((headers) => {
+          assert_own_property(headers, 'sec-fetch-site');
+          assert_array_equals(headers['sec-fetch-site'], ['cross-site']);
+        });
+  }, 'sec-fetch-site - HTTPS downgrade-upgrade');
+  </script>
+</html>
diff --git a/test/wpt/tests/fetch/metadata/navigation.https.sub.html b/test/wpt/tests/fetch/metadata/navigation.https.sub.html
new file mode 100644
index 00000000000..32c9cf77f90
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/navigation.https.sub.html
@@ -0,0 +1,23 @@
+<!DOCTYPE html>
+<html>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=/fetch/metadata/resources/helper.js></script>
+<script>
+  test(t => {
+    let expected = {
+      "mode": "navigate",
+      "site": "none",
+      "dest": "document"
+    };
+
+    let actual = {
+      "mode": "{{headers[sec-fetch-mode]}}",
+      "site": "{{headers[sec-fetch-site]}}",
+      // Skipping `Sec-Fetch-User`, as the test harness isn't consistent here.
+      "dest": "{{headers[sec-fetch-dest]}}"
+    };
+
+    assert_header_equals(actual, expected);
+  }, "This page's top-level navigation.");
+</script>
diff --git a/test/wpt/tests/fetch/metadata/object.https.sub.html b/test/wpt/tests/fetch/metadata/object.https.sub.html
new file mode 100644
index 00000000000..fae5b37b592
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/object.https.sub.html
@@ -0,0 +1,62 @@
+<!DOCTYPE html>
+<meta charset="utf-8"/>
+<link rel="author" href="mtrzos@google.com" title="Maciek Trzos">
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=/fetch/metadata/resources/helper.js></script>
+<script src=/common/utils.js></script>
+<body>
+<script>
+  let nonce = token();
+
+  promise_test(t => {
+    return new Promise((resolve, reject) => {
+      let key = "object-same-origin" + nonce;
+
+      let e = document.createElement('object');
+      e.data = "https://{{host}}:{{ports[https][0]}}/fetch/metadata/resources/record-header.py?file=" + key;
+      e.onload = e => {
+        let expected = {"site":"same-origin", "user":"", "mode":"navigate", "dest": "object"};
+        validate_expectations(key, expected, "Same-Origin object")
+          .then(_ => resolve())
+          .catch(e => reject(e));
+      };
+
+      document.body.appendChild(e);
+    })
+  }, "Same-Origin object");
+
+  promise_test(t => {
+    return new Promise((resolve, reject) => {
+      let key = "object-same-site" + nonce;
+
+      let e = document.createElement('object');
+      e.data = "https://{{hosts[][www]}}:{{ports[https][0]}}/fetch/metadata/resources/record-header.py?file=" + key;
+      e.onload = e => {
+        let expected = {"site":"same-site", "user":"", "mode":"navigate", "dest": "object"};
+        validate_expectations(key, expected, "Same-Site object")
+          .then(_ => resolve())
+          .catch(e => reject(e));
+      };
+
+      document.body.appendChild(e);
+    })
+  }, "Same-Site object");
+
+  promise_test(t => {
+    return new Promise((resolve, reject) => {
+      let key = "object-cross-site" + nonce;
+
+      let e = document.createElement('object');
+      e.data = "https://{{hosts[alt][www]}}:{{ports[https][0]}}/fetch/metadata/resources/record-header.py?file=" + key;
+      e.onload = e => {
+        let expected = {"site":"cross-site", "user":"", "mode":"navigate", "dest": "object"};
+        validate_expectations(key, expected, "Cross-Site object")
+          .then(_ => resolve())
+          .catch(e => reject(e));
+      };
+
+      document.body.appendChild(e);
+    })
+  }, "Cross-Site object");
+</script>
diff --git a/test/wpt/tests/fetch/metadata/paint-worklet.https.html b/test/wpt/tests/fetch/metadata/paint-worklet.https.html
new file mode 100644
index 00000000000..49fc7765f62
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/paint-worklet.https.html
@@ -0,0 +1,19 @@
+<!DOCTYPE html>
+
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=/fetch/metadata/resources/helper.js></script>
+<script src=/common/utils.js></script>
+<script>
+
+  promise_test(async t => {
+    const nonce = token();
+    const key = "worklet-destination" + nonce;
+
+    await CSS.paintWorklet.addModule("/fetch/metadata/resources/record-header.py?file=" + key);
+    const expected = {"site": "same-origin", "user": "", "mode": "cors", "dest": "paintworklet"};
+    await validate_expectations(key, expected);
+  }, "The fetch metadata for paint worklet");
+
+</script>
+<body></body>
diff --git a/test/wpt/tests/fetch/metadata/portal.https.sub.html b/test/wpt/tests/fetch/metadata/portal.https.sub.html
new file mode 100644
index 00000000000..55b555a1b8e
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/portal.https.sub.html
@@ -0,0 +1,50 @@
+<!DOCTYPE html>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=/resources/testdriver.js></script>
+<script src=/resources/testdriver-vendor.js></script>
+<script src=/fetch/metadata/resources/helper.js></script>
+<script src=/common/utils.js></script>
+<script src=/portals/resources/stash-utils.sub.js></script>
+<body>
+<script>
+  const USER = true;
+  const FORCED = false;
+
+  function create_test(host, expectations) {
+    async_test(t => {
+      assert_implements("HTMLPortalElement" in window, "Portals are not supported.");
+
+      let p = document.createElement('portal');
+      const key = token();
+      StashUtils.takeValue(key).then(t.step_func_done(value => {
+        assert_header_equals(value, expectations, `{{host}} -> ${host} portal`);
+      }));
+
+      let url = `https://${host}/fetch/metadata/resources/post-to-owner.py?key=${key}`;
+      p.src = url;
+      document.body.appendChild(p);
+    }, `{{host}} -> ${host} portal`);
+  }
+
+  create_test("{{host}}:{{ports[https][0]}}", {
+    "site": "same-origin",
+    "user": "",
+    "mode": "navigate",
+    "dest": "iframe"
+  });
+
+  create_test("{{hosts[][www]}}:{{ports[https][0]}}", {
+    "site": "same-site",
+    "user": "",
+    "mode": "navigate",
+    "dest": "iframe"
+  });
+
+  create_test("{{hosts[alt][www]}}:{{ports[https][0]}}", {
+    "site": "cross-site",
+    "user": "",
+    "mode": "navigate",
+    "dest": "iframe"
+  });
+</script>
diff --git a/test/wpt/tests/fetch/metadata/preload.https.sub.html b/test/wpt/tests/fetch/metadata/preload.https.sub.html
new file mode 100644
index 00000000000..29042a85474
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/preload.https.sub.html
@@ -0,0 +1,50 @@
+<!DOCTYPE html>
+<meta name="timeout" content="long">
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=/fetch/metadata/resources/helper.js></script>
+<script src=/common/utils.js></script>
+<body></body>
+<script>
+  test(t => {
+    assert_true(document.createElement('link').relList.supports('preload'));
+  }, "Browser supports preload.");
+
+  function create_test(host, as, expected) {
+    async_test(t => {
+      let nonce = token();
+      let key = as + nonce;
+
+      let e = document.createElement('link');
+      e.rel = "preload";
+      e.href = `https://${host}/fetch/metadata/resources/record-header.py?file=${key}`;
+      e.setAttribute("crossorigin", "crossorigin");
+      if (as !== undefined) {
+        e.setAttribute("as", as);
+      }
+      e.onload = e.onerror = t.step_func(e => {
+        fetch("/fetch/metadata/resources/record-header.py?retrieve=true&file=" + key)
+          .then(t.step_func(response => response.text()))
+          .then(t.step_func_done(text => assert_header_equals(text, expected, `preload ${as} ${host}`)))
+          .catch(t.unreached_func());
+      });
+
+      document.head.appendChild(e);
+    }, `<link rel='preload' as='${as}' href='https://${host}/...'>`);
+  }
+
+  let as_tests = [
+    [ "fetch", "empty" ],
+    [ "font", "font" ],
+    [ "image", "image" ],
+    [ "script", "script" ],
+    [ "style", "style" ],
+    [ "track", "track" ],
+  ];
+
+  as_tests.forEach(item => {
+    create_test("{{host}}:{{ports[https][0]}}", item[0], {"site":"same-origin", "user":"", "mode": "cors", "dest": item[1]});
+    create_test("{{hosts[][www]}}:{{ports[https][0]}}", item[0], {"site":"same-site", "user":"", "mode": "cors", "dest": item[1]});
+    create_test("{{hosts[alt][www]}}:{{ports[https][0]}}", item[0], {"site":"cross-site", "user":"", "mode": "cors", "dest": item[1]});
+  });
+</script>
diff --git a/test/wpt/tests/fetch/metadata/redirect/multiple-redirect-https-downgrade-upgrade.sub.html b/test/wpt/tests/fetch/metadata/redirect/multiple-redirect-https-downgrade-upgrade.sub.html
new file mode 100644
index 00000000000..0f8f3200165
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/redirect/multiple-redirect-https-downgrade-upgrade.sub.html
@@ -0,0 +1,18 @@
+<!DOCTYPE html>
+<html>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=/fetch/metadata/resources/helper.js></script>
+<script src=/fetch/metadata/resources/redirectTestHelper.sub.js></script>
+<script src=/common/security-features/resources/common.sub.js></script>
+<script src=/common/utils.js></script>
+<body>
+<script>
+  let nonce = token();
+  let expected = {"site": "cross-site", "user": "", "mode": "cors", "dest": "font"};
+
+  // Validate various scenarios handle a request that redirects from https => http => https
+  // correctly and avoids disclosure of any Sec- headers.
+  RunCommonRedirectTests("Https downgrade-upgrade", MultipleRedirectTo, expected);
+</script>
+</body>
diff --git a/test/wpt/tests/fetch/metadata/redirect/redirect-http-upgrade.sub.html b/test/wpt/tests/fetch/metadata/redirect/redirect-http-upgrade.sub.html
new file mode 100644
index 00000000000..fa765b66d03
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/redirect/redirect-http-upgrade.sub.html
@@ -0,0 +1,17 @@
+<!DOCTYPE html>
+<html>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=/fetch/metadata/resources/helper.js></script>
+<script src=/fetch/metadata/resources/redirectTestHelper.sub.js></script>
+<script src=/common/security-features/resources/common.sub.js></script>
+<script src=/common/utils.js></script>
+<body>
+<script>
+  let nonce = token();
+  let expected = { "site": "cross-site", "user": "", "mode": "cors", "dest": "font" };
+
+  // Validate various scenarios handle a request that redirects from http => https correctly and add the proper Sec- headers.
+  RunCommonRedirectTests("Http upgrade", upgradeRedirectTo, expected);
+</script>
+</body>
diff --git a/test/wpt/tests/fetch/metadata/redirect/redirect-https-downgrade.sub.html b/test/wpt/tests/fetch/metadata/redirect/redirect-https-downgrade.sub.html
new file mode 100644
index 00000000000..4e5a48e6f6e
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/redirect/redirect-https-downgrade.sub.html
@@ -0,0 +1,17 @@
+<!DOCTYPE html>
+<html>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=/fetch/metadata/resources/helper.js></script>
+<script src=/fetch/metadata/resources/redirectTestHelper.sub.js></script>
+<script src=/common/security-features/resources/common.sub.js></script>
+<script src=/common/utils.js></script>
+<body>
+  <script>
+  let nonce = token();
+  let expected = { "site": "", "user": "", "mode": "", "dest": "" };
+
+  // Validate various scenarios handle a request that redirects from https => http correctly and avoids disclosure of any Sec- headers.
+  RunCommonRedirectTests("Https downgrade", downgradeRedirectTo, expected);
+</script>
+</body>
diff --git a/test/wpt/tests/fetch/metadata/report.https.sub.html b/test/wpt/tests/fetch/metadata/report.https.sub.html
new file mode 100644
index 00000000000..b65f7c0a244
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/report.https.sub.html
@@ -0,0 +1,33 @@
+<!DOCTYPE html>
+<link rel="author" href="mtrzos@google.com" title="Maciek Trzos">
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=/fetch/metadata/resources/helper.js></script>
+<script>
+  setup({ explicit_done: true });
+  function generate_test(expected, name) {
+    async_test(t => {
+      t.step_timeout(_ => {
+        return validate_expectations("report-" + name, expected, name + " report")
+            .then(_ => t.done());
+      }, 1000);
+    }, name + " report");
+  }
+
+  let counter = 0;
+  document.addEventListener("securitypolicyviolation", (e) => {
+    counter++;
+    if (counter == 3) {
+      generate_test({"site":"same-origin", "user":"", "mode": "no-cors", "dest": "report"}, "same-origin");
+      generate_test({"site":"same-site", "user":"", "mode": "no-cors", "dest": "report"}, "same-site");
+      generate_test({"site":"cross-site", "user":"", "mode": "no-cors", "dest": "report"}, "cross-site");
+
+      done();
+    }
+  });
+</script>
+
+<!-- The hostname here is unimportant, so long as it doesn't match 'self'. -->
+<link id="style" href="https://{{hosts[alt][élève]}}:{{ports[https][0]}}/css/support/a-green.css" rel="stylesheet">
+
+<body></body>
diff --git a/test/wpt/tests/fetch/metadata/report.https.sub.html.sub.headers b/test/wpt/tests/fetch/metadata/report.https.sub.html.sub.headers
new file mode 100644
index 00000000000..1ec5df78f30
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/report.https.sub.html.sub.headers
@@ -0,0 +1,3 @@
+Content-Security-Policy: style-src 'self' 'unsafe-inline'; report-uri /fetch/metadata/resources/record-header.py?file=report-same-origin
+Content-Security-Policy: style-src 'self' 'unsafe-inline'; report-uri https://{{hosts[][www]}}:{{ports[https][0]}}/fetch/metadata/resources/record-header.py?file=report-same-site
+Content-Security-Policy: style-src 'self' 'unsafe-inline'; report-uri https://{{hosts[alt][www]}}:{{ports[https][0]}}/fetch/metadata/resources/record-header.py?file=report-cross-site
diff --git a/test/wpt/tests/fetch/metadata/resources/appcache-iframe.sub.html b/test/wpt/tests/fetch/metadata/resources/appcache-iframe.sub.html
new file mode 100644
index 00000000000..cea9a4feaec
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/resources/appcache-iframe.sub.html
@@ -0,0 +1,15 @@
+<!DOCTYPE html>
+<html lang="en" manifest="{{GET[manifest]}}">
+<script>
+if (!window.applicationCache) {
+  parent.postMessage('application cache not supported');
+} else {
+  applicationCache.onnoupdate =
+    applicationCache.ondownloading =
+    applicationCache.onobsolete =
+    applicationCache.onerror = function() {
+      parent.postMessage('okay');
+    };
+}
+</script>
+</html>
diff --git a/test/wpt/tests/fetch/metadata/resources/dedicatedWorker.js b/test/wpt/tests/fetch/metadata/resources/dedicatedWorker.js
new file mode 100644
index 00000000000..18626d3d845
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/resources/dedicatedWorker.js
@@ -0,0 +1 @@
+self.postMessage("Loaded");
diff --git a/test/wpt/tests/fetch/metadata/resources/echo-as-json.py b/test/wpt/tests/fetch/metadata/resources/echo-as-json.py
new file mode 100644
index 00000000000..44f68e8fe9e
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/resources/echo-as-json.py
@@ -0,0 +1,29 @@
+import json
+
+from wptserve.utils import isomorphic_decode
+
+def main(request, response):
+    headers = [(b"Content-Type", b"application/json"),
+               (b"Access-Control-Allow-Credentials", b"true")]
+
+    if b"origin" in request.headers:
+        headers.append((b"Access-Control-Allow-Origin", request.headers[b"origin"]))
+
+    body = u""
+
+    # If we're in a preflight, verify that `Sec-Fetch-Mode` is `cors`.
+    if request.method == u'OPTIONS':
+        if request.headers.get(b"sec-fetch-mode") != b"cors":
+            return (403, b"Failed"), [], body
+
+        headers.append((b"Access-Control-Allow-Methods", b"*"))
+        headers.append((b"Access-Control-Allow-Headers", b"*"))
+    else:
+        body = json.dumps({
+            u"dest": isomorphic_decode(request.headers.get(b"sec-fetch-dest", b"")),
+            u"mode": isomorphic_decode(request.headers.get(b"sec-fetch-mode", b"")),
+            u"site": isomorphic_decode(request.headers.get(b"sec-fetch-site", b"")),
+            u"user": isomorphic_decode(request.headers.get(b"sec-fetch-user", b"")),
+            })
+
+    return headers, body
diff --git a/test/wpt/tests/fetch/metadata/resources/echo-as-script.py b/test/wpt/tests/fetch/metadata/resources/echo-as-script.py
new file mode 100644
index 00000000000..1e7bc91184f
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/resources/echo-as-script.py
@@ -0,0 +1,14 @@
+import json
+
+from wptserve.utils import isomorphic_decode
+
+def main(request, response):
+    headers = [(b"Content-Type", b"text/javascript")]
+    body = u"var header = %s;" % json.dumps({
+        u"dest": isomorphic_decode(request.headers.get(b"sec-fetch-dest", b"")),
+        u"mode": isomorphic_decode(request.headers.get(b"sec-fetch-mode", b"")),
+        u"site": isomorphic_decode(request.headers.get(b"sec-fetch-site", b"")),
+        u"user": isomorphic_decode(request.headers.get(b"sec-fetch-user", b"")),
+        })
+
+    return headers, body
diff --git a/test/wpt/tests/fetch/metadata/resources/es-module.sub.js b/test/wpt/tests/fetch/metadata/resources/es-module.sub.js
new file mode 100644
index 00000000000..f9668a3dc67
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/resources/es-module.sub.js
@@ -0,0 +1 @@
+import '{{GET[moduleId]}}';
diff --git a/test/wpt/tests/fetch/metadata/resources/fetch-via-serviceworker--fallback--sw.js b/test/wpt/tests/fetch/metadata/resources/fetch-via-serviceworker--fallback--sw.js
new file mode 100644
index 00000000000..09858b2663f
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/resources/fetch-via-serviceworker--fallback--sw.js
@@ -0,0 +1,3 @@
+self.addEventListener('fetch', function(event) {
+    // Empty event handler - will fallback to the network.
+});
diff --git a/test/wpt/tests/fetch/metadata/resources/fetch-via-serviceworker--respondWith--sw.js b/test/wpt/tests/fetch/metadata/resources/fetch-via-serviceworker--respondWith--sw.js
new file mode 100644
index 00000000000..8bf8d8f2217
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/resources/fetch-via-serviceworker--respondWith--sw.js
@@ -0,0 +1,3 @@
+self.addEventListener('fetch', function(event) {
+    event.respondWith(fetch(event.request));
+});
diff --git a/test/wpt/tests/fetch/metadata/resources/fetch-via-serviceworker-frame.html b/test/wpt/tests/fetch/metadata/resources/fetch-via-serviceworker-frame.html
new file mode 100644
index 00000000000..98798025005
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/resources/fetch-via-serviceworker-frame.html
@@ -0,0 +1,3 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Page Title</title>
diff --git a/test/wpt/tests/fetch/metadata/resources/header-link.py b/test/wpt/tests/fetch/metadata/resources/header-link.py
new file mode 100644
index 00000000000..de891163a33
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/resources/header-link.py
@@ -0,0 +1,15 @@
+def main(request, response):
+    """
+    Respond with a blank HTML document and a `Link` header which describes
+    a link relation specified by the requests `location` and `rel` query string
+    parameters
+    """
+    headers = [
+        (b'Content-Type', b'text/html'),
+        (
+          b'Link',
+          b'<' + request.GET.first(b'location') + b'>; rel=' + request.GET.first(b'rel')
+        )
+    ]
+    return (200, headers, b'')
+
diff --git a/test/wpt/tests/fetch/metadata/resources/helper.js b/test/wpt/tests/fetch/metadata/resources/helper.js
new file mode 100644
index 00000000000..725f9a7e43b
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/resources/helper.js
@@ -0,0 +1,42 @@
+function validate_expectations(key, expected, tag) {
+  return fetch("/fetch/metadata/resources/record-header.py?retrieve=true&file=" + key)
+    .then(response => response.text())
+    .then(text => {
+      assert_not_equals(text, "No header has been recorded");
+      let value = JSON.parse(text);
+      test(t => assert_equals(value.dest, expected.dest), `${tag}: sec-fetch-dest`);
+      test(t => assert_equals(value.mode, expected.mode), `${tag}: sec-fetch-mode`);
+      test(t => assert_equals(value.site, expected.site), `${tag}: sec-fetch-site`);
+      test(t => assert_equals(value.user, expected.user), `${tag}: sec-fetch-user`);
+    });
+}
+
+function validate_expectations_custom_url(url, header, expected, tag) {
+  return fetch(url, header)
+    .then(response => response.text())
+    .then(text => {
+      assert_not_equals(text, "No header has been recorded");
+      let value = JSON.parse(text);
+      test(t => assert_equals(value.dest, expected.dest), `${tag}: sec-fetch-dest`);
+      test(t => assert_equals(value.mode, expected.mode), `${tag}: sec-fetch-mode`);
+      test(t => assert_equals(value.site, expected.site), `${tag}: sec-fetch-site`);
+      test(t => assert_equals(value.user, expected.user), `${tag}: sec-fetch-user`);
+    });
+}
+
+/**
+ * @param {object} value
+ * @param {object} expected
+ * @param {string} tag
+ **/
+function assert_header_equals(value, expected, tag) {
+  if (typeof(value) === "string"){
+    assert_not_equals(value, "No header has been recorded");
+    value = JSON.parse(value);
+  }
+
+  test(t => assert_equals(value.dest, expected.dest), `${tag}: sec-fetch-dest`);
+  test(t => assert_equals(value.mode, expected.mode), `${tag}: sec-fetch-mode`);
+  test(t => assert_equals(value.site, expected.site), `${tag}: sec-fetch-site`);
+  test(t => assert_equals(value.user, expected.user), `${tag}: sec-fetch-user`);
+}
diff --git a/test/wpt/tests/fetch/metadata/resources/helper.sub.js b/test/wpt/tests/fetch/metadata/resources/helper.sub.js
new file mode 100644
index 00000000000..fd179fe6f25
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/resources/helper.sub.js
@@ -0,0 +1,67 @@
+'use strict';
+
+/**
+ * Construct a URL which, when followed, will trigger redirection through zero
+ * or more specified origins and ultimately resolve in the Python handler
+ * `record-headers.py`.
+ *
+ * @param {string} key - the WPT server "stash" name where the request's
+ *                       headers should be stored
+ * @param {string[]} [origins] - zero or more origin names through which the
+ *                               request should pass; see the function
+ *                               implementation for a completel list of names
+ *                               and corresponding origins; If specified, the
+ *                               final origin will be used to access the
+ *                               `record-headers.py` hander.
+ * @param {object} [params] - a collection of key-value pairs to include as
+ *                            URL "search" parameters in the final request to
+ *                            `record-headers.py`
+ *
+ * @returns {string} an absolute URL
+ */
+function makeRequestURL(key, origins, params) {
+    const byName = {
+        httpOrigin: 'http://{{host}}:{{ports[http][0]}}',
+        httpSameSite: 'http://{{hosts[][www]}}:{{ports[http][0]}}',
+        httpCrossSite: 'http://{{hosts[alt][]}}:{{ports[http][0]}}',
+        httpsOrigin: 'https://{{host}}:{{ports[https][0]}}',
+        httpsSameSite: 'https://{{hosts[][www]}}:{{ports[https][0]}}',
+        httpsCrossSite: 'https://{{hosts[alt][]}}:{{ports[https][0]}}'
+    };
+    const redirectPath = '/fetch/api/resources/redirect.py?location=';
+    const path = '/fetch/metadata/resources/record-headers.py?key=' + key;
+
+    let requestUrl = path;
+    if (params) {
+      requestUrl += '&' + new URLSearchParams(params).toString();
+    }
+
+    if (origins && origins.length) {
+      requestUrl = byName[origins.pop()] + requestUrl;
+
+      while (origins.length) {
+        requestUrl = byName[origins.pop()] + redirectPath +
+          encodeURIComponent(requestUrl);
+      }
+    } else {
+      requestUrl = byName.httpsOrigin + requestUrl;
+    }
+
+    return requestUrl;
+}
+
+function retrieve(key, options) {
+  return fetch('/fetch/metadata/resources/record-headers.py?retrieve&key=' + key)
+    .then((response) => {
+      if (response.status === 204 && options && options.poll) {
+        return new Promise((resolve) => setTimeout(resolve, 300))
+          .then(() => retrieve(key, options));
+      }
+
+      if (response.status !== 200) {
+        throw new Error('Failed to query for recorded headers.');
+      }
+
+      return response.text().then((text) => JSON.parse(text));
+    });
+}
diff --git a/test/wpt/tests/fetch/metadata/resources/message-opener.html b/test/wpt/tests/fetch/metadata/resources/message-opener.html
new file mode 100644
index 00000000000..eb2af7b250b
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/resources/message-opener.html
@@ -0,0 +1,17 @@
+<script>
+/**
+ * Send a message to the opening browsing context when the document is
+ * "completely loaded" (a condition which occurs immediately after the `load`
+ * and `pageshow` events are fired).
+ * https://html.spec.whatwg.org/multipage/parsing.html#the-end
+ */
+'use strict';
+
+// The `pageshow` event is used instead of the `load` event because this
+// document may itself be accessed via history traversal. In such cases, the
+// browser may choose to reuse a cached document and therefore fire no
+// additional `load` events.
+addEventListener('pageshow', () => {
+  setTimeout(() => opener.postMessage(null, '*'), 0);
+});
+</script>
diff --git a/test/wpt/tests/fetch/metadata/resources/post-to-owner.py b/test/wpt/tests/fetch/metadata/resources/post-to-owner.py
new file mode 100644
index 00000000000..256dd6e49dc
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/resources/post-to-owner.py
@@ -0,0 +1,36 @@
+import json
+
+from wptserve.utils import isomorphic_decode
+
+def main(request, response):
+    headers = [
+        (b"Content-Type", b"text/html"),
+        (b"Cache-Control", b"no-cache, no-store, must-revalidate")
+    ]
+    key = request.GET.first(b"key", None)
+
+    # We serialize the key into JSON, so have to decode it first.
+    if key is not None:
+      key = key.decode('utf-8')
+
+    body = u"""
+        <!DOCTYPE html>
+        <script src="/portals/resources/stash-utils.sub.js"></script>
+        <script>
+            var data = %s;
+            if (window.opener)
+                window.opener.postMessage(data, "*");
+            if (window.top != window)
+                window.top.postMessage(data, "*");
+
+            const key = %s;
+            if (key)
+                StashUtils.putValue(key, data);
+        </script>
+    """ % (json.dumps({
+        u"dest": isomorphic_decode(request.headers.get(b"sec-fetch-dest", b"")),
+        u"mode": isomorphic_decode(request.headers.get(b"sec-fetch-mode", b"")),
+        u"site": isomorphic_decode(request.headers.get(b"sec-fetch-site", b"")),
+        u"user": isomorphic_decode(request.headers.get(b"sec-fetch-user", b"")),
+        }), json.dumps(key))
+    return headers, body
diff --git a/test/wpt/tests/fetch/metadata/resources/record-header.py b/test/wpt/tests/fetch/metadata/resources/record-header.py
new file mode 100644
index 00000000000..29ff2ed7985
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/resources/record-header.py
@@ -0,0 +1,145 @@
+import os
+import hashlib
+import json
+
+from wptserve.utils import isomorphic_decode
+
+def main(request, response):
+  ## Get the query parameter (key) from URL ##
+  ## Tests will record POST requests (CSP Report) and GET (rest) ##
+  if request.GET:
+    key = request.GET[b'file']
+  elif request.POST:
+    key = request.POST[b'file']
+
+  ## Convert the key from String to UUID valid String ##
+  testId = hashlib.md5(key).hexdigest()
+
+  ## Handle the header retrieval request ##
+  if b'retrieve' in request.GET:
+    response.writer.write_status(200)
+    response.writer.write_header(b"Connection", b"close")
+    response.writer.end_headers()
+    try:
+      header_value = request.server.stash.take(testId)
+      response.writer.write(header_value)
+    except (KeyError, ValueError) as e:
+      response.writer.write(u"No header has been recorded")
+      pass
+
+    response.close_connection = True
+
+  ## Record incoming fetch metadata header value
+  else:
+    try:
+      ## Return a serialized JSON object with one member per header. If the ##
+      ## header isn't present, the member will contain an empty string.     ##
+      header = json.dumps({
+        u"dest": isomorphic_decode(request.headers.get(b"sec-fetch-dest", b"")),
+        u"mode": isomorphic_decode(request.headers.get(b"sec-fetch-mode", b"")),
+        u"site": isomorphic_decode(request.headers.get(b"sec-fetch-site", b"")),
+        u"user": isomorphic_decode(request.headers.get(b"sec-fetch-user", b"")),
+      })
+      request.server.stash.put(testId, header)
+    except KeyError:
+      ## The header is already recorded or it doesn't exist
+      pass
+
+    ## Prevent the browser from caching returned responses and allow CORS ##
+    response.headers.set(b"Access-Control-Allow-Origin", b"*")
+    response.headers.set(b"Cache-Control", b"no-cache, no-store, must-revalidate")
+    response.headers.set(b"Pragma", b"no-cache")
+    response.headers.set(b"Expires", b"0")
+
+    ## Add a valid ServiceWorker Content-Type ##
+    if key.startswith(b"serviceworker"):
+      response.headers.set(b"Content-Type", b"application/javascript")
+
+    ## Add a valid image Content-Type ##
+    if key.startswith(b"image"):
+      response.headers.set(b"Content-Type", b"image/png")
+      file = open(os.path.join(request.doc_root, u"media", u"1x1-green.png"), u"rb")
+      image = file.read()
+      file.close()
+      return image
+
+    ## Return a valid .vtt content for the <track> tag ##
+    if key.startswith(b"track"):
+      return b"WEBVTT"
+
+    ## Return a valid SharedWorker ##
+    if key.startswith(b"sharedworker"):
+      response.headers.set(b"Content-Type", b"application/javascript")
+      file = open(os.path.join(request.doc_root, u"fetch", u"metadata",
+                               u"resources", u"sharedWorker.js"), u"rb")
+      shared_worker = file.read()
+      file.close()
+      return shared_worker
+
+    ## Return a valid font content and Content-Type ##
+    if key.startswith(b"font"):
+      response.headers.set(b"Content-Type", b"application/x-font-ttf")
+      file = open(os.path.join(request.doc_root, u"fonts", u"Ahem.ttf"), u"rb")
+      font = file.read()
+      file.close()
+      return font
+
+    ## Return a valid audio content and Content-Type ##
+    if key.startswith(b"audio"):
+      response.headers.set(b"Content-Type", b"audio/mpeg")
+      file = open(os.path.join(request.doc_root, u"media", u"sound_5.mp3"), u"rb")
+      audio = file.read()
+      file.close()
+      return audio
+
+    ## Return a valid video content and Content-Type ##
+    if key.startswith(b"video"):
+      response.headers.set(b"Content-Type", b"video/mp4")
+      file = open(os.path.join(request.doc_root, u"media", u"A4.mp4"), u"rb")
+      video = file.read()
+      file.close()
+      return video
+
+    ## Return valid style content and Content-Type ##
+    if key.startswith(b"style"):
+      response.headers.set(b"Content-Type", b"text/css")
+      return b"div { }"
+
+    ## Return a valid embed/object content and Content-Type ##
+    if key.startswith(b"embed") or key.startswith(b"object"):
+      response.headers.set(b"Content-Type", b"text/html")
+      return b"<html>EMBED!</html>"
+
+    ## Return a valid image content and Content-Type for redirect requests ##
+    if key.startswith(b"redirect"):
+      response.headers.set(b"Content-Type", b"image/jpeg")
+      file = open(os.path.join(request.doc_root, u"media", u"1x1-green.png"), u"rb")
+      image = file.read()
+      file.close()
+      return image
+
+    ## Return a valid dedicated worker
+    if key.startswith(b"worker"):
+      response.headers.set(b"Content-Type", b"application/javascript")
+      return b"self.postMessage('loaded');"
+
+    ## Return a valid worklet
+    if key.startswith(b"worklet"):
+      response.headers.set(b"Content-Type", b"application/javascript")
+      return b""
+
+    ## Return a valid XSLT
+    if key.startswith(b"xslt"):
+      response.headers.set(b"Content-Type", b"text/xsl")
+      return b"""<?xml version="1.0" encoding="UTF-8"?>
+<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0">
+  <xsl:template match="@*|node()">
+    <xsl:copy>
+      <xsl:apply-templates select="@*|node()"/>
+    </xsl:copy>
+  </xsl:template>
+</xsl:stylesheet>"""
+
+    if key.startswith(b"script"):
+      response.headers.set(b"Content-Type", b"application/javascript")
+      return b"void 0;"
diff --git a/test/wpt/tests/fetch/metadata/resources/record-headers.py b/test/wpt/tests/fetch/metadata/resources/record-headers.py
new file mode 100644
index 00000000000..0362fe228c2
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/resources/record-headers.py
@@ -0,0 +1,73 @@
+import os
+import uuid
+import hashlib
+import time
+import json
+
+
+def bytes_to_strings(d):
+  # Recursively convert bytes to strings in `d`.
+  if not isinstance(d, dict):
+    if isinstance(d, (tuple,list,set)):
+      v = [bytes_to_strings(x) for x in d]
+      return v
+    else:
+      if isinstance(d, bytes):
+        d = d.decode()
+      return d
+
+  result = {}
+  for k,v in d.items():
+    if isinstance(k, bytes):
+      k = k.decode()
+    if isinstance(v, dict):
+      v = bytes_to_strings(v)
+    elif isinstance(v, (tuple,list,set)):
+      v = [bytes_to_strings(x) for x in v]
+    elif isinstance(v, bytes):
+      v = v.decode()
+    result[k] = v
+  return result
+
+
+def main(request, response):
+  # This condition avoids false positives from CORS preflight checks, where the
+  # request under test may be followed immediately by a request to the same URL
+  # using a different HTTP method.
+  if b'requireOPTIONS' in request.GET and request.method != b'OPTIONS':
+      return
+
+  if b'key' in request.GET:
+    key = request.GET[b'key']
+  elif b'key' in request.POST:
+    key = request.POST[b'key']
+
+  ## Convert the key from String to UUID valid String ##
+  testId = hashlib.md5(key).hexdigest()
+
+  ## Handle the header retrieval request ##
+  if b'retrieve' in request.GET:
+    recorded_headers = request.server.stash.take(testId)
+
+    if recorded_headers is None:
+      return (204, [], b'')
+
+    return (200, [], recorded_headers)
+
+  ## Record incoming fetch metadata header value
+  else:
+    try:
+      request.server.stash.put(testId, json.dumps(bytes_to_strings(request.headers)))
+    except KeyError:
+      ## The header is already recorded or it doesn't exist
+      pass
+
+    ## Prevent the browser from caching returned responses and allow CORS ##
+    response.headers.set(b"Access-Control-Allow-Origin", b"*")
+    response.headers.set(b"Cache-Control", b"no-cache, no-store, must-revalidate")
+    response.headers.set(b"Pragma", b"no-cache")
+    response.headers.set(b"Expires", b"0")
+    if b"mime" in request.GET:
+        response.headers.set(b"Content-Type", request.GET.first(b"mime"))
+
+    return request.GET.first(b"body", request.POST.first(b"body", b""))
diff --git a/test/wpt/tests/fetch/metadata/resources/redirectTestHelper.sub.js b/test/wpt/tests/fetch/metadata/resources/redirectTestHelper.sub.js
new file mode 100644
index 00000000000..1bfbbae70c2
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/resources/redirectTestHelper.sub.js
@@ -0,0 +1,167 @@
+function createVideoElement() {
+  let el = document.createElement('video');
+  el.src = '/media/movie_5.mp4';
+  el.setAttribute('controls', '');
+  el.setAttribute('crossorigin', '');
+  return el;
+}
+
+function createTrack() {
+  let el = document.createElement('track');
+  el.setAttribute('default', '');
+  el.setAttribute('kind', 'captions');
+  el.setAttribute('srclang', 'en');
+  return el;
+}
+
+let secureRedirectURL = 'https://{{host}}:{{ports[https][0]}}/fetch/api/resources/redirect.py?location=';
+let insecureRedirectURL = 'http://{{host}}:{{ports[http][0]}}/fetch/api/resources/redirect.py?location=';
+let secureTestURL = 'https://{{host}}:{{ports[https][0]}}/fetch/metadata/';
+let insecureTestURL = 'http://{{host}}:{{ports[http][0]}}/fetch/metadata/';
+
+// Helper to craft an URL that will go from HTTPS => HTTP => HTTPS to
+// simulate us downgrading then upgrading again during the same redirect chain.
+function MultipleRedirectTo(partialPath) {
+  let finalURL = insecureRedirectURL + encodeURIComponent(secureTestURL + partialPath);
+  return secureRedirectURL + encodeURIComponent(finalURL);
+}
+
+// Helper to craft an URL that will go from HTTP => HTTPS to simulate upgrading a
+// given request.
+function upgradeRedirectTo(partialPath) {
+  return insecureRedirectURL + encodeURIComponent(secureTestURL + partialPath);
+}
+
+// Helper to craft an URL that will go from HTTPS => HTTP to simulate downgrading a
+// given request.
+function downgradeRedirectTo(partialPath) {
+  return secureRedirectURL + encodeURIComponent(insecureTestURL + partialPath);
+}
+
+// Helper to run common redirect test cases that don't require special setup on
+// the test page itself.
+function RunCommonRedirectTests(testNamePrefix, urlHelperMethod, expectedResults) {
+  async_test(t => {
+    let testWindow = window.open(urlHelperMethod('resources/post-to-owner.py?top-level-navigation' + nonce));
+    t.add_cleanup(_ => testWindow.close());
+    window.addEventListener('message', t.step_func(e => {
+      if (e.source != testWindow) {
+        return;
+      }
+
+      let expectation = { ...expectedResults };
+      if (expectation['mode'] != '')
+        expectation['mode'] = 'navigate';
+      if (expectation['dest'] == 'font')
+        expectation['dest'] = 'document';
+      assert_header_equals(e.data, expectation, testNamePrefix + ' top level navigation');
+      t.done();
+    }));
+  }, testNamePrefix + ' top level navigation');
+
+  promise_test(t => {
+    return new Promise((resolve, reject) => {
+      let key = 'embed-https-redirect' + nonce;
+      let e = document.createElement('embed');
+      e.src = urlHelperMethod('resources/record-header.py?file=' + key);
+      e.onload = e => {
+        let expectation = { ...expectedResults };
+        if (expectation['mode'] != '')
+          expectation['mode'] = 'navigate';
+        if (expectation['dest'] == 'font')
+          expectation['dest'] = 'embed';
+        fetch('/fetch/metadata/resources/record-header.py?retrieve=true&file=' + key)
+          .then(response => response.text())
+          .then(t.step_func(text => assert_header_equals(text, expectation, testNamePrefix + ' embed')))
+          .then(resolve)
+          .catch(e => reject(e));
+      };
+      document.body.appendChild(e);
+    });
+  }, testNamePrefix + ' embed');
+
+  promise_test(t => {
+    return new Promise((resolve, reject) => {
+      let key = 'object-https-redirect' + nonce;
+      let e = document.createElement('object');
+      e.data = urlHelperMethod('resources/record-header.py?file=' + key);
+      e.onload = e => {
+        let expectation = { ...expectedResults };
+        if (expectation['mode'] != '')
+          expectation['mode'] = 'navigate';
+        if (expectation['dest'] == 'font')
+          expectation['dest'] = 'object';
+        fetch('/fetch/metadata/resources/record-header.py?retrieve=true&file=' + key)
+          .then(response => response.text())
+          .then(t.step_func(text => assert_header_equals(text, expectation, testNamePrefix + ' object')))
+          .then(resolve)
+          .catch(e => reject(e));
+      };
+      document.body.appendChild(e);
+    });
+  }, testNamePrefix + ' object');
+
+  if (document.createElement('link').relList.supports('preload')) {
+    async_test(t => {
+      let key = 'preload' + nonce;
+      let e = document.createElement('link');
+      e.rel = 'preload';
+      e.href = urlHelperMethod('resources/record-header.py?file=' + key);
+      e.setAttribute('as', 'track');
+      e.onload = e.onerror = t.step_func_done(e => {
+        let expectation = { ...expectedResults };
+        if (expectation['mode'] != '')
+          expectation['mode'] = 'cors';
+        fetch('/fetch/metadata/resources/record-header.py?retrieve=true&file=' + key)
+          .then(t.step_func(response => response.text()))
+          .then(t.step_func_done(text => assert_header_equals(text, expectation, testNamePrefix + ' preload')))
+          .catch(t.unreached_func());
+      });
+      document.head.appendChild(e);
+    }, testNamePrefix + ' preload');
+  }
+
+  promise_test(t => {
+    return new Promise((resolve, reject) => {
+      let key = 'style-https-redirect' + nonce;
+      let e = document.createElement('link');
+      e.rel = 'stylesheet';
+      e.href = urlHelperMethod('resources/record-header.py?file=' + key);
+      e.onload = e => {
+        let expectation = { ...expectedResults };
+        if (expectation['mode'] != '')
+          expectation['mode'] = 'no-cors';
+        if (expectation['dest'] == 'font')
+          expectation['dest'] = 'style';
+        fetch('/fetch/metadata/resources/record-header.py?retrieve=true&file=' + key)
+          .then(response => response.text())
+          .then(t.step_func(text => assert_header_equals(text, expectation, testNamePrefix + ' stylesheet')))
+          .then(resolve)
+          .catch(e => reject(e));
+      };
+      document.body.appendChild(e);
+    });
+  }, testNamePrefix + ' stylesheet');
+
+  promise_test(t => {
+    return new Promise((resolve, reject) => {
+      let key = 'track-https-redirect' + nonce;
+      let video = createVideoElement();
+      let el = createTrack();
+      el.src = urlHelperMethod('resources/record-header.py?file=' + key);
+      el.onload = t.step_func(_ => {
+        let expectation = { ...expectedResults };
+        if (expectation['mode'] != '')
+          expectation['mode'] = 'cors';
+        if (expectation['dest'] == 'font')
+          expectation['dest'] = 'track';
+        fetch('/fetch/metadata/resources/record-header.py?retrieve=true&file=' + key)
+          .then(response => response.text())
+          .then(t.step_func(text => assert_header_equals(text, expectation, testNamePrefix + ' track')))
+          .then(resolve);
+      });
+      video.appendChild(el);
+      document.body.appendChild(video);
+    });
+  }, testNamePrefix + ' track');
+}
diff --git a/test/wpt/tests/fetch/metadata/resources/serviceworker-accessors-frame.html b/test/wpt/tests/fetch/metadata/resources/serviceworker-accessors-frame.html
new file mode 100644
index 00000000000..98798025005
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/resources/serviceworker-accessors-frame.html
@@ -0,0 +1,3 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Page Title</title>
diff --git a/test/wpt/tests/fetch/metadata/resources/serviceworker-accessors.sw.js b/test/wpt/tests/fetch/metadata/resources/serviceworker-accessors.sw.js
new file mode 100644
index 00000000000..36c55a77860
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/resources/serviceworker-accessors.sw.js
@@ -0,0 +1,14 @@
+addEventListener("fetch", event => {
+  event.waitUntil(async function () {
+    if (!event.clientId) return;
+    const client = await clients.get(event.clientId);
+    if (!client) return;
+
+    client.postMessage({
+      "dest": event.request.headers.get("sec-fetch-dest"),
+      "mode": event.request.headers.get("sec-fetch-mode"),
+      "site": event.request.headers.get("sec-fetch-site"),
+      "user": event.request.headers.get("sec-fetch-user")
+    });
+  }());
+});
diff --git a/test/wpt/tests/fetch/metadata/resources/sharedWorker.js b/test/wpt/tests/fetch/metadata/resources/sharedWorker.js
new file mode 100644
index 00000000000..5eb89cb4f68
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/resources/sharedWorker.js
@@ -0,0 +1,9 @@
+onconnect = function(e) {
+  var port = e.ports[0];
+
+  port.addEventListener('message', function(e) {
+    port.postMessage("Ready");
+  });
+
+  port.start();
+}
diff --git a/test/wpt/tests/fetch/metadata/resources/unload-with-beacon.html b/test/wpt/tests/fetch/metadata/resources/unload-with-beacon.html
new file mode 100644
index 00000000000..b00c9a5776a
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/resources/unload-with-beacon.html
@@ -0,0 +1,12 @@
+<!DOCTYPE html>
+<script>
+  // When told, register an unload handler that will trigger a beacon to the
+  // URL given by the sender of the message.
+  window.addEventListener('message', e => {
+      var url = e.data;
+      window.addEventListener('unload', () => {
+          navigator.sendBeacon(url, 'blah');
+      });
+      window.parent.postMessage('navigate-away', '*');
+  });
+</script>
diff --git a/test/wpt/tests/fetch/metadata/resources/xslt-test.sub.xml b/test/wpt/tests/fetch/metadata/resources/xslt-test.sub.xml
new file mode 100644
index 00000000000..acb478ab641
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/resources/xslt-test.sub.xml
@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<?xml-stylesheet href="https://{{host}}:{{ports[https][0]}}/fetch/metadata/resources/record-header.py?file=xslt-same-origin{{GET[token]}}" type="text/xsl" ?>
+<!-- Only testing same-origin XSLT because same-site and cross-site XSLT is blocked. -->
+
+<!-- postMessage parent back when the resources are loaded -->
+<script xmlns="http://www.w3.org/1999/xhtml"><![CDATA[
+  setTimeout(function(){
+    if (window.opener)
+        window.opener.postMessage("", "*");
+    if (window.top != window)
+        window.top.postMessage("", "*");}, 100);
+]]></script>
diff --git a/test/wpt/tests/fetch/metadata/serviceworker-accessors.https.sub.html b/test/wpt/tests/fetch/metadata/serviceworker-accessors.https.sub.html
new file mode 100644
index 00000000000..03a8321d4ca
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/serviceworker-accessors.https.sub.html
@@ -0,0 +1,51 @@
+<!DOCTYPE html>
+<!--
+  This test verifies that Fetch Metadata headers are not exposed to Service
+  Workers via the request's `headers` accessor.
+-->
+<meta charset="utf-8"/>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=/fetch/metadata/resources/helper.js></script>
+<script src=/service-workers/service-worker/resources/test-helpers.sub.js></script>
+<script src=/common/utils.js></script>
+<script>
+  const SCOPE = 'resources/serviceworker-accessors-frame.html';
+  const SCRIPT = 'resources/serviceworker-accessors.sw.js';
+
+  function assert_headers_not_seen_in_service_worker(frame) {
+    return new Promise((resolve, reject) => {
+      frame.contentWindow.fetch(SCOPE, {mode:'no-cors'});
+      frame.contentWindow.navigator.serviceWorker.addEventListener('message', e => {
+        assert_header_equals(e.data, {
+          "dest": null,
+          "mode": null,
+          "site": null,
+          "user": null
+        });
+        resolve();
+      });
+    });
+  }
+
+  promise_test(async function(t) {
+    const reg = await service_worker_unregister_and_register(t, SCRIPT, SCOPE);
+
+    t.add_cleanup(async () => {
+      if (reg)
+        await reg.unregister();
+    });
+
+    await wait_for_state(t, reg.installing, 'activated');
+
+    const frame = await with_iframe(SCOPE);
+    t.add_cleanup(async () => {
+      if (frame)
+        frame.remove();
+    });
+
+    // Trigger a fetch that will go through the service worker, and validate
+    // the visible headers.
+    await assert_headers_not_seen_in_service_worker(frame);
+  }, 'Sec-Fetch headers in Service Worker fetch handler.');
+</script>
diff --git a/test/wpt/tests/fetch/metadata/sharedworker.https.sub.html b/test/wpt/tests/fetch/metadata/sharedworker.https.sub.html
new file mode 100644
index 00000000000..4df858208a7
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/sharedworker.https.sub.html
@@ -0,0 +1,40 @@
+<!DOCTYPE html>
+
+<link rel="author" href="mtrzos@google.com" title="Maciek Trzos">
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=/fetch/metadata/resources/helper.js></script>
+<script src=/common/utils.js></script>
+<script>
+  let nonce = token();
+  let key = "sharedworker-same-origin" + nonce;
+
+  // TESTS //
+  if (window.Worker) {
+
+      //  Same-Origin test
+      var sharedWorker = new SharedWorker('/fetch/metadata/resources/record-header.py?file=' + key);
+      sharedWorker.port.start();
+
+      sharedWorker.onerror = function(){
+        test_same_origin();
+      }
+      sharedWorker.port.onmessage = function(e) {
+        test_same_origin();
+      }
+      sharedWorker.port.postMessage("Ready");
+    }
+
+  function test_same_origin(){
+    promise_test(t => {
+      return new Promise((resolve, reject) => {
+        let expected = {"site":"same-origin", "user":"", "mode": "same-origin", "dest": "sharedworker"};
+
+        validate_expectations(key, expected)
+          .then(_ => resolve())
+          .catch(e => reject(e));
+      })
+    }, "Same-Origin sharedworker")
+  }
+</script>
+<body></body>
diff --git a/test/wpt/tests/fetch/metadata/style.https.sub.html b/test/wpt/tests/fetch/metadata/style.https.sub.html
new file mode 100644
index 00000000000..a30d81d70dd
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/style.https.sub.html
@@ -0,0 +1,86 @@
+<!DOCTYPE html>
+<html>
+<link rel="author" href="mtrzos@google.com" title="Maciek Trzos">
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=/fetch/metadata/resources/helper.js></script>
+<script src=/common/utils.js></script>
+<body></body>
+<script>
+  let nonce = token();
+
+  promise_test(t => {
+    return new Promise((resolve, reject) => {
+      let key = "style-same-origin" + nonce;
+
+      let e = document.createElement('link');
+      e.rel = "stylesheet";
+      e.href = "https://{{host}}:{{ports[https][0]}}/fetch/metadata/resources/record-header.py?file=" + key;
+      e.onload = e => {
+        let expected = {"site":"same-origin", "user":"", "mode": "no-cors", "dest": "style"};
+        validate_expectations(key, expected, "Same-Origin style")
+          .then(_ => resolve())
+          .catch(e => reject(e));
+      };
+
+      document.body.appendChild(e);
+    })
+  }, "Same-Origin style");
+
+  promise_test(t => {
+    return new Promise((resolve, reject) => {
+      let key = "style-same-site" + nonce;
+
+      let e = document.createElement('link');
+      e.rel = "stylesheet";
+      e.href = "https://{{hosts[][www]}}:{{ports[https][0]}}/fetch/metadata/resources/record-header.py?file=" + key;
+      e.onload = e => {
+        let expected = {"site":"same-site", "user":"", "mode": "no-cors", "dest": "style"};
+        validate_expectations(key, expected, "Same-Site style")
+          .then(_ => resolve())
+          .catch(e => reject(e));
+      };
+
+      document.body.appendChild(e);
+    })
+  }, "Same-Site style");
+
+  promise_test(t => {
+    return new Promise((resolve, reject) => {
+      let key = "style-cross-site" + nonce;
+
+      let e = document.createElement('link');
+      e.rel = "stylesheet";
+      e.href = "https://{{hosts[alt][www]}}:{{ports[https][0]}}/fetch/metadata/resources/record-header.py?file=" + key;
+      e.onload = e => {
+        let expected = {"site":"cross-site", "user":"", "mode": "no-cors", "dest": "style"};
+        validate_expectations(key, expected, "Cross-Site style")
+          .then(_ => resolve())
+          .catch(e => reject(e));
+      };
+
+      document.body.appendChild(e);
+    })
+  }, "Cross-Site style");
+
+  promise_test(t => {
+    return new Promise((resolve, reject) => {
+      let key = "style-same-origin-cors" + nonce;
+
+      let e = document.createElement('link');
+      e.rel = "stylesheet";
+      e.href = "https://{{host}}:{{ports[https][0]}}/fetch/metadata/resources/record-header.py?file=" + key;
+      e.crossOrigin = "anonymous";
+      e.onload = e => {
+        let expected = {"site":"same-origin", "user":"", "mode": "cors", "dest": "style"};
+        validate_expectations(key, expected, "Same-Origin, cors style")
+          .then(_ => resolve())
+          .catch(e => reject(e));
+      };
+
+      document.body.appendChild(e);
+    })
+  }, "Same-Origin, cors style");
+</script>
+</html>
+
diff --git a/test/wpt/tests/fetch/metadata/tools/README.md b/test/wpt/tests/fetch/metadata/tools/README.md
new file mode 100644
index 00000000000..1c3bac2be5b
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/tools/README.md
@@ -0,0 +1,126 @@
+# Fetch Metadata test generation framework
+
+This directory defines a command-line tool for procedurally generating WPT
+tests.
+
+## Motivation
+
+Many features of the web platform involve the browser making one or more HTTP
+requests to remote servers. Only some aspects of these requests are specified
+within the standard that defines the relevant feature. Other aspects are
+specified by external standards which span the entire platform (e.g. [Fetch
+Metadata Request Headers](https://w3c.github.io/webappsec-fetch-metadata/)).
+
+This state of affairs makes it difficult to maintain test coverage for two
+reasons:
+
+- When a new feature introduces a new kind of web request, it must be verified
+  to integrate with every cross-cutting standard.
+- When a new cross-cutting standard is introduced, it must be verified to
+  integrate with every kind of web request.
+
+The tool in this directory attempts to reduce this tension. It allows
+maintainers to express instructions for making web requests in an abstract
+sense. These generic instructions can be reused by to produce a different suite
+of tests for each cross-cutting feature.
+
+When a new kind of request is proposed, a single generic template can be
+defined here. This will provide the maintainers of all cross-cutting features
+with clear instruction on how to extend their test suite with the new feature.
+
+Similarly, when a new cross-cutting feature is proposed, the authors can use
+this tool to build a test suite which spans the entire platform.
+
+## Build script
+
+To generate the Fetch Metadata tests, run `./wpt update-built --include fetch`
+in the root of the repository.
+
+## Configuration
+
+The test generation tool requires a YAML-formatted configuration file as its
+input. The file should define a dictionary with the following keys:
+
+- `templates` - a string describing the filesystem path from which template
+  files should be loaded
+- `output_directory` - a string describing the filesystem path where the
+  generated test files should be written
+- `cases` - a list of dictionaries describing how the test templates should be
+  expanded with individual subtests; each dictionary should have the following
+  keys:
+  - `all_subtests` - properties which should be defined for every expansion
+  - `common_axis` - a list of dictionaries
+  - `template_axes` - a dictionary relating template names to properties that
+    should be used when expanding that particular template
+
+Internally, the tool creates a set of "subtests" for each template. This set is
+the Cartesian product of the `common_axis` and the given template's entry in
+the `template_axes` dictionary. It uses this set of subtests to expand the
+template, creating an output file. Refer to the next section for a concrete
+example of how the expansion is performed.
+
+In general, the tool will output a single file for each template. However, the
+`filename_flags` attribute has special semantics. It is used to separate
+subtests for the same template file. This is intended to accommodate [the
+web-platform-test's filename-based
+conventions](https://web-platform-tests.org/writing-tests/file-names.html).
+
+For instance, when `.https` is present in a test file's name, the WPT test
+harness will load that test using the HTTPS protocol. Subtests which include
+the value `https` in the `filename_flags` property will be expanded using the
+appropriate template but written to a distinct file whose name includes
+`.https`.
+
+The generation tool requires that the configuration file references every
+template in the `templates` directory. Because templates and configuration
+files may be contributed by different people, this requirement ensures that
+configuration authors are aware of all available templates. Some templates may
+not be relevant for some features; in those cases, the configuration file can
+include an empty array for the template's entry in the `template_axes`
+dictionary (as in `template3.html` in the example which follows).
+
+## Expansion example
+
+In the following example configuration file, `a`, `b`, `s`, `w`, `x`, `y`, and
+`z` all represent associative arrays.
+
+```yaml
+templates: path/to/templates
+output_directory: path/to/output
+cases:
+  - every_subtest: s
+    common_axis: [a, b]
+    template_axes:
+      template1.html: [w]
+      template2.html: [x, y, z]
+      template3.html: []
+```
+
+When run with such a configuration file, the tool would generate two files,
+expanded with data as described below (where `(a, b)` represents the union of
+`a` and `b`):
+
+    template1.html: [(a, w), (b, w)]
+    template2.html: [(a, x), (b, x), (a, y), (b, y), (a, z), (b, z)]
+    template3.html: (zero tests; not expanded)
+
+## Design Considerations
+
+**Efficiency of generated output** The tool is capable of generating a large
+number of tests given a small amount of input. Naively structured, this could
+result in test suites which take large amount of time and computational
+resources to complete. The tool has been designed to help authors structure the
+generated output to reduce these resource requirements.
+
+**Literalness of generated output** Because the generated output is how most
+people will interact with the tests, it is important that it be approachable.
+This tool avoids outputting abstractions which would frustrate attempts to read
+the source code or step through its execution environment.
+
+**Simplicity** The test generation logic itself was written to be approachable.
+This makes it easier to anticipate how the tool will behave with new input, and
+it lowers the bar for others to contribute improvements.
+
+Non-goals include conciseness of template files (verbosity makes the potential
+expansions more predictable) and conciseness of generated output (verbosity
+aids in the interpretation of results).
diff --git a/test/wpt/tests/fetch/metadata/tools/fetch-metadata.conf.yml b/test/wpt/tests/fetch/metadata/tools/fetch-metadata.conf.yml
new file mode 100644
index 00000000000..b277bcb7b53
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/tools/fetch-metadata.conf.yml
@@ -0,0 +1,806 @@
+---
+templates: templates
+output_directory: ../generated
+cases:
+  - all_subtests:
+      expected: NULL
+      filename_flags: []
+    common_axis:
+      - headerName: sec-fetch-site
+        origins: [httpOrigin]
+        description: Not sent to non-trustworthy same-origin destination
+      - headerName: sec-fetch-site
+        origins: [httpSameSite]
+        description: Not sent to non-trustworthy same-site destination
+      - headerName: sec-fetch-site
+        origins: [httpCrossSite]
+        description: Not sent to non-trustworthy cross-site destination
+      - headerName: sec-fetch-mode
+        origins: [httpOrigin]
+        description: Not sent to non-trustworthy same-origin destination
+      - headerName: sec-fetch-mode
+        origins: [httpSameSite]
+        description: Not sent to non-trustworthy same-site destination
+      - headerName: sec-fetch-mode
+        origins: [httpCrossSite]
+        description: Not sent to non-trustworthy cross-site destination
+      - headerName: sec-fetch-dest
+        origins: [httpOrigin]
+        description: Not sent to non-trustworthy same-origin destination
+      - headerName: sec-fetch-dest
+        origins: [httpSameSite]
+        description: Not sent to non-trustworthy same-site destination
+      - headerName: sec-fetch-dest
+        origins: [httpCrossSite]
+        description: Not sent to non-trustworthy cross-site destination
+      - headerName: sec-fetch-user
+        origins: [httpOrigin]
+        description: Not sent to non-trustworthy same-origin destination
+      - headerName: sec-fetch-user
+        origins: [httpSameSite]
+        description: Not sent to non-trustworthy same-site destination
+      - headerName: sec-fetch-user
+        origins: [httpCrossSite]
+        description: Not sent to non-trustworthy cross-site destination
+    template_axes:
+      # Unused
+      appcache-manifest.sub.https.html: []
+      # The `audioWorklet` interface is only available in secure contexts
+      # https://webaudio.github.io/web-audio-api/#BaseAudioContext
+      audioworklet.https.sub.html: []
+      # Service workers are only available in secure context
+      fetch-via-serviceworker.https.sub.html: []
+      # Service workers are only available in secure context
+      serviceworker.https.sub.html: []
+
+      css-images.sub.html:
+        - filename_flags: [tentative]
+      css-font-face.sub.html:
+        - filename_flags: [tentative]
+      element-a.sub.html: [{}]
+      element-area.sub.html: [{}]
+      element-audio.sub.html: [{}]
+      element-embed.sub.html: [{}]
+      element-frame.sub.html: [{}]
+      element-iframe.sub.html: [{}]
+      element-img.sub.html:
+        - sourceAttr: src
+        - sourceAttr: srcset
+      element-img-environment-change.sub.html: [{}]
+      element-input-image.sub.html: [{}]
+      element-link-icon.sub.html: [{}]
+      element-link-prefetch.optional.sub.html: [{}]
+      element-meta-refresh.optional.sub.html: [{}]
+      element-picture.sub.html: [{}]
+      element-script.sub.html:
+        - {}
+        - elementAttrs: { type: module }
+      element-video.sub.html: [{}]
+      element-video-poster.sub.html: [{}]
+      fetch.sub.html: [{}]
+      form-submission.sub.html:
+        - method: GET
+        - method: POST
+      header-link.sub.html:
+        - rel: icon
+        - rel: stylesheet
+      header-refresh.optional.sub.html: [{}]
+      window-location.sub.html: [{}]
+      script-module-import-dynamic.sub.html: [{}]
+      script-module-import-static.sub.html: [{}]
+      svg-image.sub.html: [{}]
+      window-history.sub.html: [{}]
+      worker-dedicated-importscripts.sub.html: [{}]
+      worker-dedicated-constructor.sub.html: [{}]
+
+  # Sec-Fetch-Site - direct requests
+  - all_subtests:
+      headerName: sec-fetch-site
+      filename_flags: [https]
+    common_axis:
+      - description: Same origin
+        origins: [httpsOrigin]
+        expected: same-origin
+      - description: Cross-site
+        origins: [httpsCrossSite]
+        expected: cross-site
+      - description: Same site
+        origins: [httpsSameSite]
+        expected: same-site
+    template_axes:
+      # Unused
+      # - the request mode of all "classic" worker scripts is set to
+      #   "same-origin"
+      #   https://html.spec.whatwg.org/#fetch-a-classic-worker-script
+      # - the request mode of all "top-level "module" worker scripts is set to
+      #   "same-origin":
+      #   https://html.spec.whatwg.org/#fetch-a-single-module-script
+      worker-dedicated-constructor.sub.html: []
+
+      appcache-manifest.sub.https.html: [{}]
+      audioworklet.https.sub.html: [{}]
+      css-images.sub.html:
+        - filename_flags: [tentative]
+      css-font-face.sub.html:
+        - filename_flags: [tentative]
+      element-a.sub.html: [{}]
+      element-area.sub.html: [{}]
+      element-audio.sub.html: [{}]
+      element-embed.sub.html: [{}]
+      element-frame.sub.html: [{}]
+      element-iframe.sub.html: [{}]
+      element-img.sub.html:
+        - sourceAttr: src
+        - sourceAttr: srcset
+      element-img-environment-change.sub.html: [{}]
+      element-input-image.sub.html: [{}]
+      element-link-icon.sub.html: [{}]
+      element-link-prefetch.optional.sub.html: [{}]
+      element-meta-refresh.optional.sub.html: [{}]
+      element-picture.sub.html: [{}]
+      element-script.sub.html:
+        - {}
+        - elementAttrs: { type: module }
+      element-video.sub.html: [{}]
+      element-video-poster.sub.html: [{}]
+      fetch.sub.html: [{ init: { mode: no-cors } }]
+      fetch-via-serviceworker.https.sub.html: [{ init: { mode: no-cors } }]
+      form-submission.sub.html:
+        - method: GET
+        - method: POST
+      header-link.sub.html:
+        - rel: icon
+        - rel: stylesheet
+      header-refresh.optional.sub.html: [{}]
+      window-location.sub.html: [{}]
+      script-module-import-dynamic.sub.html: [{}]
+      script-module-import-static.sub.html: [{}]
+      serviceworker.https.sub.html: [{}]
+      svg-image.sub.html: [{}]
+      window-history.sub.html: [{}]
+      worker-dedicated-importscripts.sub.html: [{}]
+
+  # Sec-Fetch-Site - redirection from HTTP
+  - all_subtests:
+      headerName: sec-fetch-site
+      filename_flags: []
+    common_axis:
+      - description: HTTPS downgrade (header not sent)
+        origins: [httpsOrigin, httpOrigin]
+        expected: NULL
+      - description: HTTPS upgrade
+        origins: [httpOrigin, httpsOrigin]
+        expected: cross-site
+      - description: HTTPS downgrade-upgrade
+        origins: [httpsOrigin, httpOrigin, httpsOrigin]
+        expected: cross-site
+    template_axes:
+      # Unused
+      # The `audioWorklet` interface is only available in secure contexts
+      # https://webaudio.github.io/web-audio-api/#BaseAudioContext
+      audioworklet.https.sub.html: []
+      # Service workers are only available in secure context
+      fetch-via-serviceworker.https.sub.html: []
+      # Service workers' redirect mode is "error"
+      serviceworker.https.sub.html: []
+      # Interstitial locations in an HTTP redirect chain are not added to the
+      # session history, so these requests cannot be initiated using the
+      # History API.
+      window-history.sub.html: []
+      # Unused
+      # - the request mode of all "classic" worker scripts is set to
+      #   "same-origin"
+      #   https://html.spec.whatwg.org/#fetch-a-classic-worker-script
+      # - the request mode of all "top-level "module" worker scripts is set to
+      #   "same-origin":
+      #   https://html.spec.whatwg.org/#fetch-a-single-module-script
+      worker-dedicated-constructor.sub.html: []
+
+      appcache-manifest.sub.https.html: [{}]
+      css-images.sub.html:
+        - filename_flags: [tentative]
+      css-font-face.sub.html:
+        - filename_flags: [tentative]
+      element-a.sub.html: [{}]
+      element-area.sub.html: [{}]
+      element-audio.sub.html: [{}]
+      element-embed.sub.html: [{}]
+      element-frame.sub.html: [{}]
+      element-iframe.sub.html: [{}]
+      element-img.sub.html:
+        - sourceAttr: src
+        - sourceAttr: srcset
+      element-img-environment-change.sub.html: [{}]
+      element-input-image.sub.html: [{}]
+      element-link-icon.sub.html: [{}]
+      element-link-prefetch.optional.sub.html: [{}]
+      element-meta-refresh.optional.sub.html: [{}]
+      element-picture.sub.html: [{}]
+      element-script.sub.html:
+        - {}
+        - elementAttrs: { type: module }
+      element-video.sub.html: [{}]
+      element-video-poster.sub.html: [{}]
+      fetch.sub.html: [{}]
+      form-submission.sub.html:
+        - method: GET
+        - method: POST
+      header-link.sub.html:
+        - rel: icon
+        - rel: stylesheet
+      header-refresh.optional.sub.html: [{}]
+      window-location.sub.html: [{}]
+      script-module-import-dynamic.sub.html: [{}]
+      script-module-import-static.sub.html: [{}]
+      svg-image.sub.html: [{}]
+      worker-dedicated-importscripts.sub.html: [{}]
+
+  # Sec-Fetch-Site - redirection from HTTPS
+  - all_subtests:
+      headerName: sec-fetch-site
+      filename_flags: [https]
+    common_axis:
+      - description: Same-Origin -> Cross-Site -> Same-Origin redirect
+        origins: [httpsOrigin, httpsCrossSite, httpsOrigin]
+        expected: cross-site
+      - description: Same-Origin -> Same-Site -> Same-Origin redirect
+        origins: [httpsOrigin, httpsSameSite, httpsOrigin]
+        expected: same-site
+      - description: Cross-Site -> Same Origin
+        origins: [httpsCrossSite, httpsOrigin]
+        expected: cross-site
+      - description: Cross-Site -> Same-Site
+        origins: [httpsCrossSite, httpsSameSite]
+        expected: cross-site
+      - description: Cross-Site -> Cross-Site
+        origins: [httpsCrossSite, httpsCrossSite]
+        expected: cross-site
+      - description: Same-Origin -> Same Origin
+        origins: [httpsOrigin, httpsOrigin]
+        expected: same-origin
+      - description: Same-Origin -> Same-Site
+        origins: [httpsOrigin, httpsSameSite]
+        expected: same-site
+      - description: Same-Origin -> Cross-Site
+        origins: [httpsOrigin, httpsCrossSite]
+        expected: cross-site
+      - description: Same-Site -> Same Origin
+        origins: [httpsSameSite, httpsOrigin]
+        expected: same-site
+      - description: Same-Site -> Same-Site
+        origins: [httpsSameSite, httpsSameSite]
+        expected: same-site
+      - description: Same-Site -> Cross-Site
+        origins: [httpsSameSite, httpsCrossSite]
+        expected: cross-site
+    template_axes:
+      # Service Workers' redirect mode is "error"
+      serviceworker.https.sub.html: []
+      # Interstitial locations in an HTTP redirect chain are not added to the
+      # session history, so these requests cannot be initiated using the
+      # History API.
+      window-history.sub.html: []
+      # Unused
+      # - the request mode of all "classic" worker scripts is set to
+      #   "same-origin"
+      #   https://html.spec.whatwg.org/#fetch-a-classic-worker-script
+      # - the request mode of all "top-level "module" worker scripts is set to
+      #   "same-origin":
+      #   https://html.spec.whatwg.org/#fetch-a-single-module-script
+      worker-dedicated-constructor.sub.html: []
+
+      appcache-manifest.sub.https.html: [{}]
+      audioworklet.https.sub.html: [{}]
+      css-images.sub.html:
+        - filename_flags: [tentative]
+      css-font-face.sub.html:
+        - filename_flags: [tentative]
+      element-a.sub.html: [{}]
+      element-area.sub.html: [{}]
+      element-audio.sub.html: [{}]
+      element-embed.sub.html: [{}]
+      element-frame.sub.html: [{}]
+      element-iframe.sub.html: [{}]
+      element-img.sub.html:
+        - sourceAttr: src
+        - sourceAttr: srcset
+      element-img-environment-change.sub.html: [{}]
+      element-input-image.sub.html: [{}]
+      element-link-icon.sub.html: [{}]
+      element-link-prefetch.optional.sub.html: [{}]
+      element-meta-refresh.optional.sub.html: [{}]
+      element-picture.sub.html: [{}]
+      element-script.sub.html:
+        - {}
+        - elementAttrs: { type: module }
+      element-video.sub.html: [{}]
+      element-video-poster.sub.html: [{}]
+      fetch.sub.html: [{ init: { mode: no-cors } }]
+      fetch-via-serviceworker.https.sub.html: [{ init: { mode: no-cors } }]
+      form-submission.sub.html:
+        - method: GET
+        - method: POST
+      header-link.sub.html:
+        - rel: icon
+        - rel: stylesheet
+      header-refresh.optional.sub.html: [{}]
+      window-location.sub.html: [{}]
+      script-module-import-dynamic.sub.html: [{}]
+      script-module-import-static.sub.html: [{}]
+      svg-image.sub.html: [{}]
+      worker-dedicated-importscripts.sub.html: [{}]
+
+  # Sec-Fetch-Site - redirection with mixed content
+  # These tests verify the effect that redirection has on the request's "site".
+  # The initial request must be made to a resource that is "same-site" with its
+  # origin. This avoids false positives because if the request were made to a
+  # cross-site resource, the value of "cross-site" would be assigned regardless
+  # of the subseqent redirection.
+  #
+  # Because these conditions necessarily warrant mixed content, only templates
+  # which can be configured to allow mixed content [1] can be used.
+  #
+  # [1] https://w3c.github.io/webappsec-mixed-content/#should-block-fetch
+
+  - common_axis:
+      - description: HTTPS downgrade-upgrade
+        headerName: sec-fetch-site
+        origins: [httpsOrigin, httpOrigin, httpsOrigin]
+        expected: cross-site
+        filename_flags: [https]
+    template_axes:
+      # Mixed Content considers only a small subset of requests as
+      # "optionally-blockable." These are the only requests that can be tested
+      # for the "downgrade-upgrade" scenario, so all other templates must be
+      # explicitly ignored.
+      audioworklet.https.sub.html: []
+      css-font-face.sub.html: []
+      element-embed.sub.html: []
+      element-frame.sub.html: []
+      element-iframe.sub.html: []
+      element-img-environment-change.sub.html: []
+      element-link-icon.sub.html: []
+      element-link-prefetch.optional.sub.html: []
+      element-picture.sub.html: []
+      element-script.sub.html: []
+      fetch.sub.html: []
+      fetch-via-serviceworker.https.sub.html: []
+      header-link.sub.html: []
+      script-module-import-static.sub.html: []
+      script-module-import-dynamic.sub.html: []
+      # Service Workers' redirect mode is "error"
+      serviceworker.https.sub.html: []
+      # Interstitial locations in an HTTP redirect chain are not added to the
+      # session history, so these requests cannot be initiated using the
+      # History API.
+      window-history.sub.html: []
+      worker-dedicated-constructor.sub.html: []
+      worker-dedicated-importscripts.sub.html: []
+      # Avoid duplicate subtest for 'sec-fetch-site - HTTPS downgrade-upgrade'
+      appcache-manifest.sub.https.html: []
+      css-images.sub.html:
+        - filename_flags: [tentative]
+      element-a.sub.html: [{}]
+      element-area.sub.html: [{}]
+      element-audio.sub.html: [{}]
+      element-img.sub.html:
+        # srcset omitted because it is not "optionally-blockable"
+        # https://w3c.github.io/webappsec-mixed-content/#category-optionally-blockable
+        - sourceAttr: src
+      element-input-image.sub.html: [{}]
+      element-meta-refresh.optional.sub.html: [{}]
+      element-video.sub.html: [{}]
+      element-video-poster.sub.html: [{}]
+      form-submission.sub.html:
+        - method: GET
+        - method: POST
+      header-refresh.optional.sub.html: [{}]
+      svg-image.sub.html: [{}]
+      window-location.sub.html: [{}]
+
+  # Sec-Fetch-Mode
+  # These tests are served over HTTPS so the induced requests will be both
+  # same-origin with the document [1] and a potentially-trustworthy URL [2].
+  #
+  # [1] https://html.spec.whatwg.org/multipage/origin.html#same-origin
+  # [2] https://w3c.github.io/webappsec-secure-contexts/#potentially-trustworthy-url
+  - common_axis:
+      - headerName: sec-fetch-mode
+        filename_flags: [https]
+        origins: []
+    template_axes:
+      appcache-manifest.sub.https.html:
+        - expected: no-cors
+      audioworklet.https.sub.html:
+        # https://html.spec.whatwg.org/multipage/webappapis.html#fetch-a-single-module-script
+        - expected: cors
+      css-images.sub.html:
+        - expected: no-cors
+          filename_flags: [tentative]
+      css-font-face.sub.html:
+        - expected: cors
+          filename_flags: [tentative]
+      element-a.sub.html:
+        - expected: navigate
+        # https://html.spec.whatwg.org/multipage/links.html#downloading-hyperlinks
+        - elementAttrs: {download: ''}
+          expected: no-cors
+      element-area.sub.html:
+        - expected: navigate
+        # https://html.spec.whatwg.org/multipage/links.html#downloading-hyperlinks
+        - elementAttrs: {download: ''}
+          expected: no-cors
+      element-audio.sub.html:
+        - expected: no-cors
+        - expected: cors
+          elementAttrs: { crossorigin: '' }
+        - expected: cors
+          elementAttrs: { crossorigin: anonymous }
+        - expected: cors
+          elementAttrs: { crossorigin: use-credentials }
+      element-embed.sub.html:
+        - expected: no-cors
+      element-frame.sub.html:
+        - expected: navigate
+      element-iframe.sub.html:
+        - expected: navigate
+      element-img.sub.html:
+        - sourceAttr: src
+          expected: no-cors
+        - sourceAttr: src
+          expected: cors
+          elementAttrs: { crossorigin: '' }
+        - sourceAttr: src
+          expected: cors
+          elementAttrs: { crossorigin: anonymous }
+        - sourceAttr: src
+          expected: cors
+          elementAttrs: { crossorigin: use-credentials }
+        - sourceAttr: srcset
+          expected: no-cors
+        - sourceAttr: srcset
+          expected: cors
+          elementAttrs: { crossorigin: '' }
+        - sourceAttr: srcset
+          expected: cors
+          elementAttrs: { crossorigin: anonymous }
+        - sourceAttr: srcset
+          expected: cors
+          elementAttrs: { crossorigin: use-credentials }
+      element-img-environment-change.sub.html:
+        - expected: no-cors
+        - expected: cors
+          elementAttrs: { crossorigin: '' }
+        - expected: cors
+          elementAttrs: { crossorigin: anonymous }
+        - expected: cors
+          elementAttrs: { crossorigin: use-credentials }
+      element-input-image.sub.html:
+        - expected: no-cors
+      element-link-icon.sub.html:
+        - expected: no-cors
+        - expected: cors
+          elementAttrs: { crossorigin: '' }
+        - expected: cors
+          elementAttrs: { crossorigin: anonymous }
+        - expected: cors
+          elementAttrs: { crossorigin: use-credentials }
+      element-link-prefetch.optional.sub.html:
+        - expected: no-cors
+        - expected: cors
+          elementAttrs: { crossorigin: '' }
+        - expected: cors
+          elementAttrs: { crossorigin: anonymous }
+        - expected: cors
+          elementAttrs: { crossorigin: use-credentials }
+      element-meta-refresh.optional.sub.html:
+        - expected: navigate
+      element-picture.sub.html:
+        - expected: no-cors
+        - expected: cors
+          elementAttrs: { crossorigin: '' }
+        - expected: cors
+          elementAttrs: { crossorigin: anonymous }
+        - expected: cors
+          elementAttrs: { crossorigin: use-credentials }
+      element-script.sub.html:
+        - expected: no-cors
+        - expected: cors
+          elementAttrs: { type: module }
+        - expected: cors
+          elementAttrs: { crossorigin: '' }
+        - expected: cors
+          elementAttrs: { crossorigin: anonymous }
+        - expected: cors
+          elementAttrs: { crossorigin: use-credentials }
+      element-video.sub.html:
+        - expected: no-cors
+        - expected: cors
+          elementAttrs: { crossorigin: '' }
+        - expected: cors
+          elementAttrs: { crossorigin: anonymous }
+        - expected: cors
+          elementAttrs: { crossorigin: use-credentials }
+      element-video-poster.sub.html:
+        - expected: no-cors
+      fetch.sub.html:
+        - expected: cors
+        - expected: cors
+          init: { mode: cors }
+        - expected: no-cors
+          init: { mode: no-cors }
+        - expected: same-origin
+          init: { mode: same-origin }
+      fetch-via-serviceworker.https.sub.html:
+        - expected: cors
+        - expected: cors
+          init: { mode: cors }
+        - expected: no-cors
+          init: { mode: no-cors }
+        - expected: same-origin
+          init: { mode: same-origin }
+      form-submission.sub.html:
+        - method: GET
+          expected: navigate
+        - method: POST
+          expected: navigate
+      header-link.sub.html:
+        - rel: icon
+          expected: no-cors
+        - rel: stylesheet
+          expected: no-cors
+      header-refresh.optional.sub.html:
+        - expected: navigate
+      window-history.sub.html:
+        - expected: navigate
+      window-location.sub.html:
+        - expected: navigate
+      script-module-import-dynamic.sub.html:
+        - expected: cors
+      script-module-import-static.sub.html:
+        - expected: cors
+      # https://svgwg.org/svg2-draft/linking.html#processingURL-fetch
+      svg-image.sub.html:
+        - expected: no-cors
+        - expected: cors
+          elementAttrs: { crossorigin: '' }
+        - expected: cors
+          elementAttrs: { crossorigin: anonymous }
+        - expected: cors
+          elementAttrs: { crossorigin: use-credentials }
+      serviceworker.https.sub.html:
+        - expected: same-origin
+          options: { type: 'classic' }
+        # https://github.com/whatwg/html/pull/5875
+        - expected: same-origin
+      worker-dedicated-constructor.sub.html:
+        - expected: same-origin
+        - options: { type: module }
+          expected: same-origin
+      worker-dedicated-importscripts.sub.html:
+        - expected: no-cors
+
+  # Sec-Fetch-Dest
+  - common_axis:
+      - headerName: sec-fetch-dest
+        filename_flags: [https]
+        origins: []
+    template_axes:
+      appcache-manifest.sub.https.html:
+        - expected: empty
+      audioworklet.https.sub.html:
+        # https://github.com/WebAudio/web-audio-api/issues/2203
+        - expected: audioworklet
+      css-images.sub.html:
+        - expected: image
+          filename_flags: [tentative]
+      css-font-face.sub.html:
+        - expected: font
+          filename_flags: [tentative]
+      element-a.sub.html:
+        - expected: document
+        # https://html.spec.whatwg.org/multipage/links.html#downloading-hyperlinks
+        - elementAttrs: {download: ''}
+          expected: empty
+      element-area.sub.html:
+        - expected: document
+        # https://html.spec.whatwg.org/multipage/links.html#downloading-hyperlinks
+        - elementAttrs: {download: ''}
+          expected: empty
+      element-audio.sub.html:
+        - expected: audio
+      element-embed.sub.html:
+        - expected: embed
+      element-frame.sub.html:
+        # https://github.com/whatwg/html/pull/4976
+        - expected: frame
+      element-iframe.sub.html:
+        # https://github.com/whatwg/html/pull/4976
+        - expected: iframe
+      element-img.sub.html:
+        - sourceAttr: src
+          expected: image
+        - sourceAttr: srcset
+          expected: image
+      element-img-environment-change.sub.html:
+        - expected: image
+      element-input-image.sub.html:
+        - expected: image
+      element-link-icon.sub.html:
+        - expected: empty
+      element-link-prefetch.optional.sub.html:
+        - expected: empty
+        - elementAttrs: { as: audio }
+          expected: audio
+        - elementAttrs: { as: document }
+          expected: document
+        - elementAttrs: { as: embed }
+          expected: embed
+        - elementAttrs: { as: fetch }
+          expected: fetch
+        - elementAttrs: { as: font }
+          expected: font
+        - elementAttrs: { as: image }
+          expected: image
+        - elementAttrs: { as: object }
+          expected: object
+        - elementAttrs: { as: script }
+          expected: script
+        - elementAttrs: { as: style }
+          expected: style
+        - elementAttrs: { as: track }
+          expected: track
+        - elementAttrs: { as: video }
+          expected: video
+        - elementAttrs: { as: worker }
+          expected: worker
+      element-meta-refresh.optional.sub.html:
+        - expected: document
+      element-picture.sub.html:
+        - expected: image
+      element-script.sub.html:
+        - expected: script
+      element-video.sub.html:
+        - expected: video
+      element-video-poster.sub.html:
+        - expected: image
+      fetch.sub.html:
+        - expected: empty
+      fetch-via-serviceworker.https.sub.html:
+        - expected: empty
+      form-submission.sub.html:
+        - method: GET
+          expected: document
+        - method: POST
+          expected: document
+      header-link.sub.html:
+        - rel: icon
+          expected: empty
+        - rel: stylesheet
+          filename_flags: [tentative]
+          expected: style
+      header-refresh.optional.sub.html:
+        - expected: document
+      window-history.sub.html:
+        - expected: document
+      window-location.sub.html:
+        - expected: document
+      script-module-import-dynamic.sub.html:
+        - expected: script
+      script-module-import-static.sub.html:
+        - expected: script
+      serviceworker.https.sub.html:
+        - expected: serviceworker
+      # Implemented as "image" in Chromium and Firefox, but specified as
+      # "empty"
+      # https://github.com/w3c/svgwg/issues/782
+      svg-image.sub.html:
+        - expected: empty
+      worker-dedicated-constructor.sub.html:
+        - expected: worker
+        - options: { type: module }
+          expected: worker
+      worker-dedicated-importscripts.sub.html:
+        - expected: script
+
+  # Sec-Fetch-User
+  - common_axis:
+      - headerName: sec-fetch-user
+        filename_flags: [https]
+        origins: []
+    template_axes:
+      appcache-manifest.sub.https.html:
+        - expected: NULL
+      audioworklet.https.sub.html:
+        - expected: NULL
+      css-images.sub.html:
+        - expected: NULL
+          filename_flags: [tentative]
+      css-font-face.sub.html:
+        - expected: NULL
+          filename_flags: [tentative]
+      element-a.sub.html:
+        - expected: NULL
+        - userActivated: TRUE
+          expected: ?1
+      element-area.sub.html:
+        - expected: NULL
+        - userActivated: TRUE
+          expected: ?1
+      element-audio.sub.html:
+        - expected: NULL
+      element-embed.sub.html:
+        - expected: NULL
+      element-frame.sub.html:
+        - expected: NULL
+        - userActivated: TRUE
+          expected: ?1
+      element-iframe.sub.html:
+        - expected: NULL
+        - userActivated: TRUE
+          expected: ?1
+      element-img.sub.html:
+        - sourceAttr: src
+          expected: NULL
+        - sourceAttr: srcset
+          expected: NULL
+      element-img-environment-change.sub.html:
+        - expected: NULL
+      element-input-image.sub.html:
+        - expected: NULL
+      element-link-icon.sub.html:
+        - expected: NULL
+      element-link-prefetch.optional.sub.html:
+        - expected: NULL
+      element-meta-refresh.optional.sub.html:
+        - expected: NULL
+      element-picture.sub.html:
+        - expected: NULL
+      element-script.sub.html:
+        - expected: NULL
+      element-video.sub.html:
+        - expected: NULL
+      element-video-poster.sub.html:
+        - expected: NULL
+      fetch.sub.html:
+        - expected: NULL
+      fetch-via-serviceworker.https.sub.html:
+        - expected: NULL
+      form-submission.sub.html:
+        - method: GET
+          expected: NULL
+        - method: GET
+          userActivated: TRUE
+          expected: ?1
+        - method: POST
+          expected: NULL
+        - method: POST
+          userActivated: TRUE
+          expected: ?1
+      header-link.sub.html:
+        - rel: icon
+          expected: NULL
+        - rel: stylesheet
+          expected: NULL
+      header-refresh.optional.sub.html:
+        - expected: NULL
+      window-history.sub.html:
+        - expected: NULL
+      window-location.sub.html:
+        - expected: NULL
+        - userActivated: TRUE
+          expected: ?1
+      script-module-import-dynamic.sub.html:
+        - expected: NULL
+      script-module-import-static.sub.html:
+        - expected: NULL
+      serviceworker.https.sub.html:
+        - expected: NULL
+      svg-image.sub.html:
+        - expected: NULL
+      worker-dedicated-constructor.sub.html:
+        - expected: NULL
+        - options: { type: module }
+          expected: NULL
+      worker-dedicated-importscripts.sub.html:
+        - expected: NULL
diff --git a/test/wpt/tests/fetch/metadata/tools/generate.py b/test/wpt/tests/fetch/metadata/tools/generate.py
new file mode 100644
index 00000000000..fa850c8c8a0
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/tools/generate.py
@@ -0,0 +1,195 @@
+#!/usr/bin/env python3
+
+import itertools
+import os
+
+import jinja2
+import yaml
+
+HERE = os.path.abspath(os.path.dirname(__file__))
+PROJECT_ROOT = os.path.join(HERE, '..', '..', '..')
+
+def find_templates(starting_directory):
+    for directory, subdirectories, file_names in os.walk(starting_directory):
+        for file_name in file_names:
+            if file_name.startswith('.'):
+                continue
+            yield file_name, os.path.join(directory, file_name)
+
+def test_name(directory, template_name, subtest_flags):
+    '''
+    Create a test name based on a template and the WPT file name flags [1]
+    required for a given subtest. This name is used to determine how subtests
+    may be grouped together. In order to promote grouping, the combination uses
+    a few aspects of how file name flags are interpreted:
+
+    - repeated flags have no effect, so duplicates are removed
+    - flag sequence does not matter, so flags are consistently sorted
+
+    directory | template_name    | subtest_flags   | result
+    ----------|------------------|-----------------|-------
+    cors      | image.html       | []              | cors/image.html
+    cors      | image.https.html | []              | cors/image.https.html
+    cors      | image.html       | [https]         | cors/image.https.html
+    cors      | image.https.html | [https]         | cors/image.https.html
+    cors      | image.https.html | [https]         | cors/image.https.html
+    cors      | image.sub.html   | [https]         | cors/image.https.sub.html
+    cors      | image.https.html | [sub]           | cors/image.https.sub.html
+
+    [1] docs/writing-tests/file-names.md
+    '''
+    template_name_parts = template_name.split('.')
+    flags = set(subtest_flags) | set(template_name_parts[1:-1])
+    test_name_parts = (
+        [template_name_parts[0]] +
+        sorted(flags) +
+        [template_name_parts[-1]]
+    )
+    return os.path.join(directory, '.'.join(test_name_parts))
+
+def merge(a, b):
+    if type(a) != type(b):
+        raise Exception('Cannot merge disparate types')
+    if type(a) == list:
+        return a + b
+    if type(a) == dict:
+        merged = {}
+
+        for key in a:
+            if key in b:
+                merged[key] = merge(a[key], b[key])
+            else:
+                merged[key] = a[key]
+
+        for key in b:
+            if not key in a:
+                merged[key] = b[key]
+
+        return merged
+
+    raise Exception('Cannot merge {} type'.format(type(a).__name__))
+
+def product(a, b):
+    '''
+    Given two lists of objects, compute their Cartesian product by merging the
+    elements together. For example,
+
+       product(
+           [{'a': 1}, {'b': 2}],
+           [{'c': 3}, {'d': 4}, {'e': 5}]
+       )
+
+    returns the following list:
+
+        [
+            {'a': 1, 'c': 3},
+            {'a': 1, 'd': 4},
+            {'a': 1, 'e': 5},
+            {'b': 2, 'c': 3},
+            {'b': 2, 'd': 4},
+            {'b': 2, 'e': 5}
+        ]
+    '''
+    result = []
+
+    for a_object in a:
+        for b_object in b:
+            result.append(merge(a_object, b_object))
+
+    return result
+
+def make_provenance(project_root, cases, template):
+    return '\n'.join([
+        'This test was procedurally generated. Please do not modify it directly.',
+        'Sources:',
+        '- {}'.format(os.path.relpath(cases, project_root)),
+        '- {}'.format(os.path.relpath(template, project_root))
+    ])
+
+def collection_filter(obj, title):
+    if not obj:
+        return 'no {}'.format(title)
+
+    members = []
+    for name, value in obj.items():
+        if value == '':
+            members.append(name)
+        else:
+            members.append('{}={}'.format(name, value))
+
+    return '{}: {}'.format(title, ', '.join(members))
+
+def pad_filter(value, side, padding):
+    if not value:
+        return ''
+    if side == 'start':
+        return padding + value
+
+    return value + padding
+
+def main(config_file):
+    with open(config_file, 'r') as handle:
+        config = yaml.safe_load(handle.read())
+
+    templates_directory = os.path.normpath(
+        os.path.join(os.path.dirname(config_file), config['templates'])
+    )
+
+    environment = jinja2.Environment(
+        variable_start_string='[%',
+        variable_end_string='%]'
+    )
+    environment.filters['collection'] = collection_filter
+    environment.filters['pad'] = pad_filter
+    templates = {}
+    subtests = {}
+
+    for template_name, path in find_templates(templates_directory):
+        subtests[template_name] = []
+        with open(path, 'r') as handle:
+            templates[template_name] = environment.from_string(handle.read())
+
+    for case in config['cases']:
+        unused_templates = set(templates) - set(case['template_axes'])
+
+        # This warning is intended to help authors avoid mistakenly omitting
+        # templates. It can be silenced by extending the`template_axes`
+        # dictionary with an empty list for templates which are intentionally
+        # unused.
+        if unused_templates:
+            print(
+                'Warning: case does not reference the following templates:'
+            )
+            print('\n'.join('- {}'.format(name) for name in unused_templates))
+
+        common_axis = product(
+            case['common_axis'], [case.get('all_subtests', {})]
+        )
+
+        for template_name, template_axis in case['template_axes'].items():
+            subtests[template_name].extend(product(common_axis, template_axis))
+
+    for template_name, template in templates.items():
+        provenance = make_provenance(
+            PROJECT_ROOT,
+            config_file,
+            os.path.join(templates_directory, template_name)
+        )
+        get_filename = lambda subtest: test_name(
+            config['output_directory'],
+            template_name,
+            subtest['filename_flags']
+        )
+        subtests_by_filename = itertools.groupby(
+            sorted(subtests[template_name], key=get_filename),
+            key=get_filename
+        )
+        for filename, some_subtests in subtests_by_filename:
+            with open(filename, 'w') as handle:
+                handle.write(templates[template_name].render(
+                    subtests=list(some_subtests),
+                    provenance=provenance
+                ) + '\n')
+
+if __name__ == '__main__':
+    main('fetch-metadata.conf.yml')
diff --git a/test/wpt/tests/fetch/metadata/tools/templates/appcache-manifest.sub.https.html b/test/wpt/tests/fetch/metadata/tools/templates/appcache-manifest.sub.https.html
new file mode 100644
index 00000000000..0dfc084f2e3
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/tools/templates/appcache-manifest.sub.https.html
@@ -0,0 +1,63 @@
+<!DOCTYPE html>
+<!--
+[%provenance%]
+-->
+<html lang="en">
+  <meta charset="utf-8">
+  <title>HTTP headers on request for Appcache manifest</title>
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  <script src="/fetch/metadata/resources/helper.sub.js"></script>
+  <body>
+  <script>
+  'use strict';
+
+  function induceRequest(url) {
+    const iframe = document.createElement('iframe');
+    iframe.src =
+      '/fetch/metadata/resources/appcache-iframe.sub.html?manifest=' + encodeURIComponent(url);
+
+    return new Promise((resolve) => {
+        addEventListener('message', function onMessage(event) {
+          if (event.source !== iframe.contentWindow) {
+            return;
+          }
+          removeEventListener('message', onMessage);
+          resolve(event.data);
+        });
+
+        document.body.appendChild(iframe);
+      })
+      .then((message) => {
+        if (message !== 'okay') {
+          throw message;
+        }
+      })
+      .then(() => iframe.remove());
+  }
+
+  {%- for subtest in subtests %}
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    assert_implements_optional(
+      !!window.applicationCache, 'Application Cache supported.'
+    );
+
+    induceRequest(makeRequestURL(key, [% subtest.origins %]))
+      .then(() => retrieve(key))
+      .then((headers) => {
+        {%- if subtest.expected == none %}
+          assert_not_own_property(headers, '[%subtest.headerName%]');
+        {%- else %}
+          assert_own_property(headers, '[%subtest.headerName%]');
+          assert_array_equals(headers['[%subtest.headerName%]'], ['[%subtest.expected%]']);
+        {%- endif %}
+      })
+      .then(() => t.done(), t.step_func((error) => { throw error; }));
+  }, '[%subtest.headerName%][%subtest.description | pad("start", " - ")%]');
+
+  {%- endfor %}
+  </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/fetch/metadata/tools/templates/audioworklet.https.sub.html b/test/wpt/tests/fetch/metadata/tools/templates/audioworklet.https.sub.html
new file mode 100644
index 00000000000..7be309c5068
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/tools/templates/audioworklet.https.sub.html
@@ -0,0 +1,53 @@
+<!DOCTYPE html>
+<!--
+[%provenance%]
+-->
+<html lang="en">
+  <meta charset="utf-8">
+  <title>HTTP headers on request for AudioWorklet module</title>
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  <script src="/resources/testdriver.js"></script>
+  <script src="/resources/testdriver-vendor.js"></script>
+  <script src="/fetch/metadata/resources/helper.sub.js"></script>
+  <body>
+  <script>
+  'use strict';
+
+  function induceRequest(url, test) {
+    return test_driver.bless(
+      'Enable WebAudio playback',
+      () => {
+        const audioContext = new AudioContext();
+
+        test.add_cleanup(() => audioContext.close());
+
+        return audioContext.audioWorklet.addModule(url);
+      }
+    );
+  }
+
+  {%- for subtest in subtests %}
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, [% subtest.origins %], {mime: 'text/javascript'}),
+        t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+        {%- if subtest.expected == none %}
+          assert_not_own_property(headers, '[%subtest.headerName%]');
+        {%- else %}
+          assert_own_property(headers, '[%subtest.headerName%]');
+          assert_array_equals(headers['[%subtest.headerName%]'], ['[%subtest.expected%]']);
+        {%- endif %}
+        });
+  }, '[%subtest.headerName%][%subtest.description | pad("start", " - ")%]');
+
+  {%- endfor %}
+  </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/fetch/metadata/tools/templates/css-font-face.sub.html b/test/wpt/tests/fetch/metadata/tools/templates/css-font-face.sub.html
new file mode 100644
index 00000000000..94b33f4e6b0
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/tools/templates/css-font-face.sub.html
@@ -0,0 +1,60 @@
+<!DOCTYPE html>
+<!--
+[%provenance%]
+-->
+<html lang="en">
+  <meta charset="utf-8">
+  <title>HTTP headers on request for CSS font-face</title>
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  <script src="/fetch/metadata/resources/helper.sub.js"></script>
+  <body>
+  <script>
+  'use strict';
+
+  let count = 0;
+
+  function induceRequest(t, url) {
+    const id = `el-${count += 1}`;
+    const style = document.createElement('style');
+    style.appendChild(document.createTextNode(`
+      @font-face {
+        font-family: wpt-font-family${id};
+        src: url(${url});
+      }
+      #el-${id} {
+        font-family: wpt-font-family${id};
+      }
+    `));
+    const div = document.createElement('div');
+    div.setAttribute('id', 'el-' + id);
+    div.appendChild(style);
+    div.appendChild(document.createTextNode('x'));
+    document.body.appendChild(div);
+
+    t.add_cleanup(() => div.remove());
+
+    return document.fonts.ready;
+  }
+
+  {%- for subtest in subtests %}
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(t, makeRequestURL(key, [% subtest.origins %]))
+      .then(() => retrieve(key))
+      .then((headers) => {
+        {%- if subtest.expected == none %}
+          assert_not_own_property(headers, '[%subtest.headerName%]');
+        {%- else %}
+          assert_own_property(headers, '[%subtest.headerName%]');
+          assert_array_equals(headers['[%subtest.headerName%]'], ['[%subtest.expected%]']);
+        {%- endif %}
+      });
+  }, '[%subtest.headerName%][%subtest.description | pad("start", " - ")%]');
+
+  {%- endfor %}
+  </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/fetch/metadata/tools/templates/css-images.sub.html b/test/wpt/tests/fetch/metadata/tools/templates/css-images.sub.html
new file mode 100644
index 00000000000..e394f9f5b06
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/tools/templates/css-images.sub.html
@@ -0,0 +1,137 @@
+<!DOCTYPE html>
+<!--
+[%provenance%]
+-->
+<html lang="en">
+  <meta charset="utf-8">
+  {%- if subtests|length > 10 %}
+  <meta name="timeout" content="long">
+  {%- endif %}
+  <title>HTTP headers on request for CSS image-accepting properties</title>
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  <script src="/fetch/metadata/resources/helper.sub.js"></script>
+  <body>
+  <script>
+  'use strict';
+
+  /**
+   * The subtests in this file use an iframe to induce requests for CSS
+   * resources because an iframe's `onload` event is the most direct and
+   * generic mechanism to detect loading of CSS resources. As an optimization,
+   * the subtests share the same iframe and document.
+   */
+  const declarations = [];
+  const iframe = document.createElement('iframe');
+  const whenIframeReady = new Promise((resolve, reject) => {
+    iframe.onload = resolve;
+    iframe.onerror = reject;
+  });
+
+  {%- for subtest in subtests %}
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, [% subtest.origins %]);
+
+    declarations.push(`background-image: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+        {%- if subtest.expected == none %}
+          assert_not_own_property(headers, '[%subtest.headerName%]');
+        {%- else %}
+          assert_own_property(headers, '[%subtest.headerName%]');
+          assert_equals(headers['[%subtest.headerName%]'], '[%subtest.expected%]');
+        {%- endif %}
+        })
+        .then(t.step_func_done(), (error) => t.unreached_func());
+  }, 'background-image [%subtest.headerName%][%subtest.description | pad("start", " - ")%]');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, [% subtest.origins %]);
+
+    declarations.push(`border-image: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+        {%- if subtest.expected == none %}
+          assert_not_own_property(headers, '[%subtest.headerName%]');
+        {%- else %}
+          assert_own_property(headers, '[%subtest.headerName%]');
+          assert_array_equals(headers['[%subtest.headerName%]'], ['[%subtest.expected%]']);
+        {%- endif %}
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'border-image [%subtest.headerName%][%subtest.description | pad("start", " - ")%]');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, [% subtest.origins %]);
+
+    declarations.push(`content: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+        {%- if subtest.expected == none %}
+          assert_not_own_property(headers, '[%subtest.headerName%]');
+        {%- else %}
+          assert_own_property(headers, '[%subtest.headerName%]');
+          assert_array_equals(headers['[%subtest.headerName%]'], ['[%subtest.expected%]']);
+        {%- endif %}
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'content [%subtest.headerName%][%subtest.description | pad("start", " - ")%]');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, [% subtest.origins %]);
+
+    declarations.push(`cursor: url("${url}"), auto;`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+        {%- if subtest.expected == none %}
+          assert_not_own_property(headers, '[%subtest.headerName%]');
+        {%- else %}
+          assert_own_property(headers, '[%subtest.headerName%]');
+          assert_array_equals(headers['[%subtest.headerName%]'], ['[%subtest.expected%]']);
+        {%- endif %}
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'cursor [%subtest.headerName%][%subtest.description | pad("start", " - ")%]');
+
+  async_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, [% subtest.origins %]);
+
+    declarations.push(`list-style-image: url("${url}");`);
+
+    whenIframeReady
+      .then(() => retrieve(key))
+      .then((headers) => {
+        {%- if subtest.expected == none %}
+          assert_not_own_property(headers, '[%subtest.headerName%]');
+        {%- else %}
+          assert_own_property(headers, '[%subtest.headerName%]');
+          assert_array_equals(headers['[%subtest.headerName%]'], ['[%subtest.expected%]']);
+        {%- endif %}
+        })
+      .then(t.step_func_done(), t.unreached_func());
+  }, 'list-style-image [%subtest.headerName%][%subtest.description | pad("start", " - ")%]');
+
+  {%- endfor %}
+
+  iframe.srcdoc = declarations.map((declaration, index) => `
+    <style>.el${index} { ${declaration} }</style><div class="el${index}"></div>`
+    ).join('');
+  document.body.appendChild(iframe);
+
+  </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/fetch/metadata/tools/templates/element-a.sub.html b/test/wpt/tests/fetch/metadata/tools/templates/element-a.sub.html
new file mode 100644
index 00000000000..2bd8e8a40e0
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/tools/templates/element-a.sub.html
@@ -0,0 +1,72 @@
+<!DOCTYPE html>
+<!--
+[%provenance%]
+-->
+<html lang="en">
+  <meta charset="utf-8">
+  {%- if subtests|length > 10 %}
+  <meta name="timeout" content="long">
+  {%- endif %}
+  <title>HTTP headers on request for HTML "a" element navigation</title>
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  {%- if subtests|selectattr('userActivated')|list %}
+  <script src="/resources/testdriver.js"></script>
+  <script src="/resources/testdriver-vendor.js"></script>
+  {%- endif %}
+  <script src="/fetch/metadata/resources/helper.sub.js"></script>
+  <body>
+  <script>
+  'use strict';
+
+  function induceRequest(url, {test, userActivated, attributes}) {
+    const win = window.open();
+    const anchor = win.document.createElement('a');
+    anchor.setAttribute('href', url);
+
+    for (const [ name, value ] of Object.entries(attributes)) {
+      anchor.setAttribute(name, value);
+    }
+
+    win.document.body.appendChild(anchor);
+
+    test.add_cleanup(() => win.close());
+
+    if (userActivated) {
+      test_driver.bless('enable user activation', () => anchor.click());
+    } else {
+      anchor.click();
+    }
+  }
+
+  {%- for subtest in subtests %}
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      makeRequestURL(key, [% subtest.origins %], {mime: 'text/html'}),
+      {
+        test: t,
+        userActivated: [%subtest.userActivated | default(false) | tojson%],
+        attributes: [%subtest.elementAttrs | default({}) | tojson%]
+      }
+    );
+
+    // `induceRequest` does not necessarily trigger a navigation, so the Python
+    // handler must be polled until it has received the initial request.
+    return retrieve(key, {poll: true})
+      .then((headers) => {
+        {%- if subtest.expected == none %}
+          assert_not_own_property(headers, '[%subtest.headerName%]');
+        {%- else %}
+          assert_own_property(headers, '[%subtest.headerName%]');
+          assert_array_equals(headers['[%subtest.headerName%]'], ['[%subtest.expected%]']);
+        {%- endif %}
+        });
+  }, '[%subtest.headerName%][%subtest.description | pad("start", " - ")%] - [%subtest.elementAttrs | collection("attributes")%][% " with user activation" if subtest.userActivated%]');
+
+  {%- endfor %}
+  </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/fetch/metadata/tools/templates/element-area.sub.html b/test/wpt/tests/fetch/metadata/tools/templates/element-area.sub.html
new file mode 100644
index 00000000000..0cef5b22941
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/tools/templates/element-area.sub.html
@@ -0,0 +1,72 @@
+<!DOCTYPE html>
+<!--
+[%provenance%]
+-->
+<html lang="en">
+  <meta charset="utf-8">
+  {%- if subtests|length > 10 %}
+  <meta name="timeout" content="long">
+  {%- endif %}
+  <title>HTTP headers on request for HTML "area" element navigation</title>
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  {%- if subtests|selectattr('userActivated')|list %}
+  <script src="/resources/testdriver.js"></script>
+  <script src="/resources/testdriver-vendor.js"></script>
+  {%- endif %}
+  <script src="/fetch/metadata/resources/helper.sub.js"></script>
+  <body>
+  <script>
+  'use strict';
+
+  function induceRequest(url, {test, userActivated, attributes}) {
+    const win = window.open();
+    const area = win.document.createElement('area');
+    area.setAttribute('href', url);
+
+    for (const [ name, value ] of Object.entries(attributes)) {
+      area.setAttribute(name, value);
+    }
+
+    win.document.body.appendChild(area);
+
+    test.add_cleanup(() => win.close());
+
+    if (userActivated) {
+      test_driver.bless('enable user activation', () => area.click());
+    } else {
+      area.click();
+    }
+  }
+
+  {%- for subtest in subtests %}
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      makeRequestURL(key, [% subtest.origins %], {mime: 'text/html'}),
+      {
+        test: t,
+        userActivated: [%subtest.userActivated | default(false) | tojson%],
+        attributes: [%subtest.elementAttrs | default({}) | tojson%]
+      }
+    );
+
+    // `induceRequest` does not necessarily trigger a navigation, so the Python
+    // handler must be polled until it has received the initial request.
+    return retrieve(key, {poll: true})
+      .then((headers) => {
+        {%- if subtest.expected == none %}
+          assert_not_own_property(headers, '[%subtest.headerName%]');
+        {%- else %}
+          assert_own_property(headers, '[%subtest.headerName%]');
+          assert_array_equals(headers['[%subtest.headerName%]'], ['[%subtest.expected%]']);
+        {%- endif %}
+        });
+  }, '[%subtest.headerName%][%subtest.description | pad("start", " - ")%] - [%subtest.elementAttrs | collection("attributes")%][% " with user activation" if subtest.userActivated%]');
+
+  {%- endfor %}
+  </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/fetch/metadata/tools/templates/element-audio.sub.html b/test/wpt/tests/fetch/metadata/tools/templates/element-audio.sub.html
new file mode 100644
index 00000000000..92bc22198e7
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/tools/templates/element-audio.sub.html
@@ -0,0 +1,51 @@
+<!DOCTYPE html>
+<!--
+[%provenance%]
+-->
+<html lang="en">
+  <meta charset="utf-8">
+  <title>HTTP headers on request for HTML "audio" element source</title>
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  <script src="/fetch/metadata/resources/helper.sub.js"></script>
+  <body>
+  <script>
+  'use strict';
+
+  function induceRequest(url, attributes) {
+    const audio = document.createElement('audio');
+
+    for (const [ name, value ] of Object.entries(attributes)) {
+      audio.setAttribute(name, value);
+    }
+
+    return new Promise((resolve) => {
+        audio.setAttribute('src', url);
+        audio.onload = audio.onerror = resolve;
+      });
+  }
+
+  {%- for subtest in subtests %}
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, [% subtest.origins %]),
+        [%subtest.elementAttrs | default({}) | tojson%]
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+        {%- if subtest.expected == none %}
+          assert_not_own_property(headers, '[%subtest.headerName%]');
+        {%- else %}
+          assert_own_property(headers, '[%subtest.headerName%]');
+          assert_array_equals(headers['[%subtest.headerName%]'], ['[%subtest.expected%]']);
+        {%- endif %}
+        });
+  }, '[%subtest.headerName%] - [%subtest.description | pad("end", ", ")%][%subtest.elementAttrs | collection("attributes")%]');
+
+  {%- endfor %}
+  </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/fetch/metadata/tools/templates/element-embed.sub.html b/test/wpt/tests/fetch/metadata/tools/templates/element-embed.sub.html
new file mode 100644
index 00000000000..18ce09e5fdc
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/tools/templates/element-embed.sub.html
@@ -0,0 +1,54 @@
+<!DOCTYPE html>
+<!--
+[%provenance%]
+-->
+<html lang="en">
+  <meta charset="utf-8">
+  <title>HTTP headers on request for HTML "embed" element source</title>
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  <script src="/fetch/metadata/resources/helper.sub.js"></script>
+  <body>
+  <script>
+  'use strict';
+
+  const params = {
+    body: `
+      <svg xmlns="http://www.w3.org/2000/svg" width="123" height="123">
+        <rect fill="lime" width="123" height="123"/>
+      </svg>
+    `,
+    mime: 'image/svg+xml'
+  };
+
+  function induceRequest(t, url) {
+    const embed = document.createElement('embed');
+    embed.setAttribute('src', url);
+    document.body.appendChild(embed);
+
+    t.add_cleanup(() => embed.remove());
+
+    return new Promise((resolve) => embed.addEventListener('load', resolve));
+  }
+
+  {%- for subtest in subtests %}
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(t, makeRequestURL(key, [% subtest.origins %], params))
+      .then(() => retrieve(key))
+      .then((headers) => {
+        {%- if subtest.expected == none %}
+          assert_not_own_property(headers, '[%subtest.headerName%]');
+        {%- else %}
+          assert_own_property(headers, '[%subtest.headerName%]');
+          assert_array_equals(headers['[%subtest.headerName%]'], ['[%subtest.expected%]']);
+        {%- endif %}
+      });
+  }, '[%subtest.headerName%][%subtest.description | pad("start", " - ")%]');
+
+  {%- endfor %}
+  </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/fetch/metadata/tools/templates/element-frame.sub.html b/test/wpt/tests/fetch/metadata/tools/templates/element-frame.sub.html
new file mode 100644
index 00000000000..ce90171779a
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/tools/templates/element-frame.sub.html
@@ -0,0 +1,62 @@
+<!DOCTYPE html>
+<!--
+[%provenance%]
+-->
+<html lang="en">
+  <meta charset="utf-8">
+  <title>HTTP headers on request for HTML "frame" element source</title>
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  {%- if subtests|selectattr('userActivated')|list %}
+  <script src="/resources/testdriver.js"></script>
+  <script src="/resources/testdriver-vendor.js"></script>
+  {%- endif %}
+  <script src="/fetch/metadata/resources/helper.sub.js"></script>
+  <body>
+  <script>
+  'use strict';
+
+  function induceRequest(url, test, userActivated) {
+    const frame = document.createElement('frame');
+
+    const setSrc = () => frame.setAttribute('src', url);
+
+    document.body.appendChild(frame);
+    test.add_cleanup(() => frame.remove());
+
+    return new Promise((resolve) => {
+       if (userActivated) {
+         test_driver.bless('enable user activation', setSrc);
+       } else {
+         setSrc();
+       }
+
+        frame.onload = frame.onerror = resolve;
+      });
+  }
+
+  {%- for subtest in subtests %}
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, [% subtest.origins %], {mime: 'text/html'}),
+        t,
+        [%subtest.userActivated | default(false) | tojson%]
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+        {%- if subtest.expected == none %}
+          assert_not_own_property(headers, '[%subtest.headerName%]');
+        {%- else %}
+          assert_own_property(headers, '[%subtest.headerName%]');
+          assert_array_equals(headers['[%subtest.headerName%]'], ['[%subtest.expected%]']);
+        {%- endif %}
+        });
+  }, '[%subtest.headerName%][%subtest.description | pad("start", " - ")%][% " with user activation" if subtest.userActivated%]');
+
+  {%- endfor %}
+  </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/fetch/metadata/tools/templates/element-iframe.sub.html b/test/wpt/tests/fetch/metadata/tools/templates/element-iframe.sub.html
new file mode 100644
index 00000000000..43a632a15cd
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/tools/templates/element-iframe.sub.html
@@ -0,0 +1,62 @@
+<!DOCTYPE html>
+<!--
+[%provenance%]
+-->
+<html lang="en">
+  <meta charset="utf-8">
+  <title>HTTP headers on request for HTML "frame" element source</title>
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  {%- if subtests|selectattr('userActivated')|list %}
+  <script src="/resources/testdriver.js"></script>
+  <script src="/resources/testdriver-vendor.js"></script>
+  {%- endif %}
+  <script src="/fetch/metadata/resources/helper.sub.js"></script>
+  <body>
+  <script>
+  'use strict';
+
+  function induceRequest(url, test, userActivated) {
+    const iframe = document.createElement('iframe');
+
+    const setSrc = () => iframe.setAttribute('src', url);
+
+    document.body.appendChild(iframe);
+    test.add_cleanup(() => iframe.remove());
+
+    return new Promise((resolve) => {
+       if (userActivated) {
+         test_driver.bless('enable user activation', setSrc);
+       } else {
+         setSrc();
+       }
+
+        iframe.onload = iframe.onerror = resolve;
+      });
+  }
+
+  {%- for subtest in subtests %}
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, [% subtest.origins %], {mime: 'text/html'}),
+        t,
+        [%subtest.userActivated | default(false) | tojson%]
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+        {%- if subtest.expected == none %}
+          assert_not_own_property(headers, '[%subtest.headerName%]');
+        {%- else %}
+          assert_own_property(headers, '[%subtest.headerName%]');
+          assert_array_equals(headers['[%subtest.headerName%]'], ['[%subtest.expected%]']);
+        {%- endif %}
+        });
+  }, '[%subtest.headerName%][%subtest.description | pad("start", " - ")%][% " with user activation" if subtest.userActivated%]');
+
+  {%- endfor %}
+  </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/fetch/metadata/tools/templates/element-img-environment-change.sub.html b/test/wpt/tests/fetch/metadata/tools/templates/element-img-environment-change.sub.html
new file mode 100644
index 00000000000..5a65114f184
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/tools/templates/element-img-environment-change.sub.html
@@ -0,0 +1,78 @@
+<!DOCTYPE html>
+<!--
+[%provenance%]
+-->
+<html lang="en">
+  <meta charset="utf-8">
+  <title>HTTP headers on image request triggered by change to environment</title>
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  <script src="/fetch/metadata/resources/helper.sub.js"></script>
+  <body>
+  <script>
+  'use strict';
+
+  // The response to the request under test must describe a valid image
+  // resource in order for the `load` event to be fired.
+  const params = {
+    body: `
+      <svg xmlns="http://www.w3.org/2000/svg" width="123" height="123">
+        <rect fill="lime" width="123" height="123"/>
+      </svg>
+    `,
+    mime: 'image/svg+xml'
+  };
+
+  function induceRequest(t, url, attributes) {
+    const iframe = document.createElement('iframe');
+    iframe.style.width = '50px';
+    document.body.appendChild(iframe);
+    t.add_cleanup(() => iframe.remove());
+    iframe.contentDocument.open();
+    iframe.contentDocument.close();
+
+    const image = iframe.contentDocument.createElement('img');
+    for (const [ name, value ] of Object.entries(attributes)) {
+      image.setAttribute(name, value);
+    }
+    iframe.contentDocument.body.appendChild(image);
+
+    image.setAttribute('srcset', `${url} 100w, /media/1x1-green.png 1w`);
+    image.setAttribute('sizes', '(max-width: 100px) 1px, (min-width: 150px) 123px');
+
+    return new Promise((resolve) => {
+        image.onload = image.onerror = resolve;
+      })
+      .then(() => {
+
+        iframe.style.width = '200px';
+
+        return new Promise((resolve) => image.onload = resolve);
+      });
+  }
+
+  {%- for subtest in subtests %}
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        t,
+        makeRequestURL(key, [% subtest.origins %], params),
+        [%subtest.elementAttrs | default({}) | tojson%]
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+        {%- if subtest.expected == none %}
+          assert_not_own_property(headers, '[%subtest.headerName%]');
+        {%- else %}
+          assert_own_property(headers, '[%subtest.headerName%]');
+          assert_array_equals(headers['[%subtest.headerName%]'], ['[%subtest.expected%]']);
+        {%- endif %}
+        });
+  }, '[%subtest.headerName%] - [%subtest.description | pad("end", ", ")%][%subtest.elementAttrs | collection("attributes")%]');
+
+  {%- endfor %}
+  </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/fetch/metadata/tools/templates/element-img.sub.html b/test/wpt/tests/fetch/metadata/tools/templates/element-img.sub.html
new file mode 100644
index 00000000000..1dac5843ecd
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/tools/templates/element-img.sub.html
@@ -0,0 +1,52 @@
+<!DOCTYPE html>
+<!--
+[%provenance%]
+-->
+<html lang="en">
+  <meta charset="utf-8">
+  <title>HTTP headers on request for HTML "img" element source</title>
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  <script src="/fetch/metadata/resources/helper.sub.js"></script>
+  <body>
+  <script>
+  'use strict';
+
+  function induceRequest(url, sourceAttr, attributes) {
+    const image = document.createElement('img');
+
+    for (const [ name, value ] of Object.entries(attributes)) {
+      image.setAttribute(name, value);
+    }
+
+    return new Promise((resolve) => {
+        image.setAttribute(sourceAttr, url);
+        image.onload = image.onerror = resolve;
+      });
+  }
+
+  {%- for subtest in subtests %}
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, [% subtest.origins %]),
+        '[%subtest.sourceAttr%]',
+        [%subtest.elementAttrs | default({}) | tojson%]
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+        {%- if subtest.expected == none %}
+          assert_not_own_property(headers, '[%subtest.headerName%]');
+        {%- else %}
+          assert_own_property(headers, '[%subtest.headerName%]');
+          assert_array_equals(headers['[%subtest.headerName%]'], ['[%subtest.expected%]']);
+        {%- endif %}
+        });
+  }, '[%subtest.headerName%] - [%subtest.sourceAttr%] - [%subtest.description | pad("end", ", ")%][%subtest.elementAttrs | collection("attributes")%]');
+
+  {%- endfor %}
+  </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/fetch/metadata/tools/templates/element-input-image.sub.html b/test/wpt/tests/fetch/metadata/tools/templates/element-input-image.sub.html
new file mode 100644
index 00000000000..3c50008433c
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/tools/templates/element-input-image.sub.html
@@ -0,0 +1,48 @@
+<!DOCTYPE html>
+<!--
+[%provenance%]
+-->
+<html lang="en">
+  <meta charset="utf-8">
+  <title>HTTP headers on request for HTML "input" element with type="button"</title>
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  <script src="/fetch/metadata/resources/helper.sub.js"></script>
+  <body>
+  <script>
+  'use strict';
+
+  function induceRequest(url, test) {
+    const input = document.createElement('input');
+    input.setAttribute('type', 'image');
+
+    document.body.appendChild(input);
+    test.add_cleanup(() => input.remove());
+
+    return new Promise((resolve) => {
+        input.onload = input.onerror = resolve;
+        input.setAttribute('src', url);
+      });
+  }
+
+  {%- for subtest in subtests %}
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(makeRequestURL(key, [% subtest.origins %]), t)
+      .then(() => retrieve(key))
+      .then((headers) => {
+        {%- if subtest.expected == none %}
+          assert_not_own_property(headers, '[%subtest.headerName%]');
+        {%- else %}
+          assert_own_property(headers, '[%subtest.headerName%]');
+          assert_array_equals(headers['[%subtest.headerName%]'], ['[%subtest.expected%]']);
+        {%- endif %}
+        });
+  }, '[%subtest.headerName%] - [%subtest.description | pad("end", ", ")%][%subtest.elementAttrs | collection("attributes")%]');
+
+  {%- endfor %}
+  </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/fetch/metadata/tools/templates/element-link-icon.sub.html b/test/wpt/tests/fetch/metadata/tools/templates/element-link-icon.sub.html
new file mode 100644
index 00000000000..18ce12a6898
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/tools/templates/element-link-icon.sub.html
@@ -0,0 +1,75 @@
+<!DOCTYPE html>
+<!--
+[%provenance%]
+-->
+<html lang="en">
+  <meta charset="utf-8">
+  {%- if subtests|length > 10 %}
+  <meta name="timeout" content="long">
+  {%- endif %}
+  <title>HTTP headers on request for HTML "link" element with rel="icon"</title>
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  <script src="/fetch/metadata/resources/helper.sub.js"></script>
+  <body>
+  <script>
+  'use strict';
+
+  const params = {
+    body: `
+      <svg xmlns="http://www.w3.org/2000/svg" width="123" height="123">
+        <rect fill="lime" width="123" height="123"/>
+      </svg>
+    `,
+    mime: 'image/svg+xml'
+  };
+
+  /**
+   * The `link` element supports a `load` event. That event would reliably
+   * indicate that the browser had received the request. Multiple major
+   * browsers do not implement the event, however, so in order to promote the
+   * visibility of this test, a less efficient polling-based detection
+   * mechanism is used.
+   *
+   * https://bugzilla.mozilla.org/show_bug.cgi?id=1638188
+   * https://bugs.chromium.org/p/chromium/issues/detail?id=1083034
+   */
+  function induceRequest(t, url, attributes) {
+    const link = document.createElement('link');
+    link.setAttribute('rel', 'icon');
+    link.setAttribute('href', url);
+
+    for (const [ name, value ] of Object.entries(attributes)) {
+      link.setAttribute(name, value);
+    }
+
+    document.head.appendChild(link);
+    t.add_cleanup(() => link.remove());
+  }
+
+  {%- for subtest in subtests %}
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      t,
+      makeRequestURL(key, [% subtest.origins %], params),
+      [%subtest.elementAttrs | default({}) | tojson%]
+    );
+
+    return retrieve(key, {poll:true})
+      .then((headers) => {
+        {%- if subtest.expected == none %}
+          assert_not_own_property(headers, '[%subtest.headerName%]');
+        {%- else %}
+          assert_own_property(headers, '[%subtest.headerName%]');
+          assert_array_equals(headers['[%subtest.headerName%]'], ['[%subtest.expected%]']);
+        {%- endif %}
+      });
+  }, '[%subtest.headerName%][%subtest.description | pad("start", " - ")%] [%subtest.elementAttrs | collection("attributes")%]');
+
+  {%- endfor %}
+  </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/fetch/metadata/tools/templates/element-link-prefetch.optional.sub.html b/test/wpt/tests/fetch/metadata/tools/templates/element-link-prefetch.optional.sub.html
new file mode 100644
index 00000000000..59d677d8d67
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/tools/templates/element-link-prefetch.optional.sub.html
@@ -0,0 +1,71 @@
+<!DOCTYPE html>
+<!--
+[%provenance%]
+-->
+<html lang="en">
+  <meta charset="utf-8">
+  {%- if subtests|length > 10 %}
+  <meta name="timeout" content="long">
+  {%- endif %}
+  <title>HTTP headers on request for HTML "link" element with rel="prefetch"</title>
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  <script src="/fetch/metadata/resources/helper.sub.js"></script>
+  <body>
+  <script>
+  'use strict';
+
+  /**
+   * The `link` element supports a `load` event. That event would reliably
+   * indicate that the browser had received the request. Multiple major
+   * browsers do not implement the event, however, so in order to promote the
+   * visibility of this test, a less efficient polling-based detection
+   * mechanism is used.
+   *
+   * https://bugzilla.mozilla.org/show_bug.cgi?id=1638188
+   * https://bugs.chromium.org/p/chromium/issues/detail?id=1083034
+   */
+  function induceRequest(t, url, attributes) {
+    const link = document.createElement('link');
+    link.setAttribute('rel', 'prefetch');
+    link.setAttribute('href', url);
+
+    for (const [ name, value ] of Object.entries(attributes)) {
+      link.setAttribute(name, value);
+    }
+
+    document.head.appendChild(link);
+    t.add_cleanup(() => link.remove());
+  }
+
+  setup(() => {
+    assert_implements_optional(document.createElement('link').relList.supports('prefetch'));
+  });
+
+  {%- for subtest in subtests %}
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    induceRequest(
+      t,
+      makeRequestURL(key, [% subtest.origins %]),
+      [%subtest.elementAttrs | default({}) | tojson%]
+    );
+
+    return retrieve(key, {poll:true})
+      .then((headers) => {
+        {%- if subtest.expected == none %}
+          assert_not_own_property(headers, '[%subtest.headerName%]');
+        {%- else %}
+          assert_own_property(headers, '[%subtest.headerName%]');
+          assert_array_equals(headers['[%subtest.headerName%]'], ['[%subtest.expected%]']);
+        {%- endif %}
+      });
+  }, '[%subtest.headerName%][%subtest.description | pad("start", " - ")%] [%subtest.elementAttrs | collection("attributes")%]');
+
+  {%- endfor %}
+  </script>
+  </body>
+</html>
+
diff --git a/test/wpt/tests/fetch/metadata/tools/templates/element-meta-refresh.optional.sub.html b/test/wpt/tests/fetch/metadata/tools/templates/element-meta-refresh.optional.sub.html
new file mode 100644
index 00000000000..5a8d8f8ecd2
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/tools/templates/element-meta-refresh.optional.sub.html
@@ -0,0 +1,60 @@
+<!DOCTYPE html>
+<!--
+[%provenance%]
+-->
+<html lang="en">
+  <meta charset="utf-8">
+  <title>HTTP headers on request for HTML "meta" element with http-equiv="refresh"</title>
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  <script src="/fetch/metadata/resources/helper.sub.js"></script>
+  <body>
+  <script>
+  'use strict';
+
+  function induceRequest(url, test) {
+    const win = window.open();
+    test.add_cleanup(() => win.close());
+
+    win.document.open();
+    win.document.write(
+      `<meta http-equiv="Refresh" content="0; URL=${url}">`
+    );
+    win.document.close();
+
+    return new Promise((resolve) => {
+      addEventListener('message', (event) => {
+          if (event.source === win) {
+            resolve();
+          }
+        });
+    });
+  }
+
+  const responseParams = {
+    mime: 'text/html',
+    body: `<script>opener.postMessage(0, '*')</${''}script>`
+  };
+  {%- for subtest in subtests %}
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, [% subtest.origins %], responseParams), t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+        {%- if subtest.expected == none %}
+          assert_not_own_property(headers, '[%subtest.headerName%]');
+        {%- else %}
+          assert_own_property(headers, '[%subtest.headerName%]');
+          assert_array_equals(headers['[%subtest.headerName%]'], ['[%subtest.expected%]']);
+        {%- endif %}
+        });
+  }, '[%subtest.headerName%][%subtest.description | pad("start", " - ")%]');
+
+  {%- endfor %}
+  </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/fetch/metadata/tools/templates/element-picture.sub.html b/test/wpt/tests/fetch/metadata/tools/templates/element-picture.sub.html
new file mode 100644
index 00000000000..903aeed1f37
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/tools/templates/element-picture.sub.html
@@ -0,0 +1,101 @@
+<!DOCTYPE html>
+<!--
+[%provenance%]
+-->
+<html lang="en">
+  <meta charset="utf-8">
+  <title>HTTP headers on request for HTML "picture" element source</title>
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  <script src="/fetch/metadata/resources/helper.sub.js"></script>
+  <body>
+  <script>
+  'use strict';
+
+  function induceRequest(url, sourceEl, sourceAttr, attributes) {
+    const picture = document.createElement('picture');
+    const els = {
+      img: document.createElement('img'),
+      source: document.createElement('source')
+    };
+    picture.appendChild(els.source);
+    picture.appendChild(els.img);
+    document.body.appendChild(picture);
+
+    for (const [ name, value ] of Object.entries(attributes)) {
+      els.img.setAttribute(name, value);
+    }
+
+    return new Promise((resolve) => {
+        els[sourceEl].setAttribute(sourceAttr, url);
+        els.img.onload = els.img.onerror = resolve;
+      });
+  }
+
+  {%- for subtest in subtests %}
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, [% subtest.origins %]),
+        'img',
+        'src',
+        [%subtest.elementAttrs | default({}) | tojson%]
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+        {%- if subtest.expected == none %}
+          assert_not_own_property(headers, '[%subtest.headerName%]');
+        {%- else %}
+          assert_own_property(headers, '[%subtest.headerName%]');
+          assert_array_equals(headers['[%subtest.headerName%]'], ['[%subtest.expected%]']);
+        {%- endif %}
+        });
+  }, '[%subtest.headerName%] - img[src] - [%subtest.description | pad("end", ", ")%][%subtest.elementAttrs | collection("attributes")%]');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, [% subtest.origins %]),
+        'img',
+        'srcset',
+        [%subtest.elementAttrs | default({}) | tojson%]
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+        {%- if subtest.expected == none %}
+          assert_not_own_property(headers, '[%subtest.headerName%]');
+        {%- else %}
+          assert_own_property(headers, '[%subtest.headerName%]');
+          assert_array_equals(headers['[%subtest.headerName%]'], ['[%subtest.expected%]']);
+        {%- endif %}
+        });
+  }, '[%subtest.headerName%] - img[srcset] - [%subtest.description | pad("end", ", ")%][%subtest.elementAttrs | collection("attributes")%]');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, [% subtest.origins %]),
+        'source',
+        'srcset',
+        [%subtest.elementAttrs | default({}) | tojson%]
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+        {%- if subtest.expected == none %}
+          assert_not_own_property(headers, '[%subtest.headerName%]');
+        {%- else %}
+          assert_own_property(headers, '[%subtest.headerName%]');
+          assert_array_equals(headers['[%subtest.headerName%]'], ['[%subtest.expected%]']);
+        {%- endif %}
+        });
+  }, '[%subtest.headerName%] - source[srcset] - [%subtest.description | pad("end", ", ")%][%subtest.elementAttrs | collection("attributes")%]');
+
+  {%- endfor %}
+  </script>
+  </body>
+</html>
+
diff --git a/test/wpt/tests/fetch/metadata/tools/templates/element-script.sub.html b/test/wpt/tests/fetch/metadata/tools/templates/element-script.sub.html
new file mode 100644
index 00000000000..4a281ae5192
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/tools/templates/element-script.sub.html
@@ -0,0 +1,54 @@
+<!DOCTYPE html>
+<!--
+[%provenance%]
+-->
+<html lang="en">
+  <meta charset="utf-8">
+  <title>HTTP headers on request for HTML "script" element source</title>
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  <script src="/fetch/metadata/resources/helper.sub.js"></script>
+  <body>
+  <script>
+  'use strict';
+
+  function induceRequest(url, attributes) {
+    const script = document.createElement('script');
+    script.setAttribute('src', url);
+
+    for (const [ name, value ] of Object.entries(attributes)) {
+      script.setAttribute(name, value);
+    }
+
+    return new Promise((resolve, reject) => {
+        script.onload = resolve;
+        script.onerror = () => reject('Failed to load script');
+        document.body.appendChild(script);
+      })
+      .then(() => script.remove());
+  }
+  {%- for subtest in subtests %}
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, [% subtest.origins %], { mime: 'application/javascript' }
+    );
+
+    return induceRequest(url,
+        [%subtest.elementAttrs | default({}) | tojson%]
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+        {%- if subtest.expected == none %}
+          assert_not_own_property(headers, '[%subtest.headerName%]');
+        {%- else %}
+          assert_own_property(headers, '[%subtest.headerName%]');
+          assert_array_equals(headers['[%subtest.headerName%]'], ['[%subtest.expected%]']);
+        {%- endif %}
+        });
+  }, '[%subtest.headerName%] - [%subtest.description | pad("end", ", ")%][%-subtest.elementAttrs | collection("attributes")%]');
+
+  {%- endfor %}
+  </script>
+</html>
diff --git a/test/wpt/tests/fetch/metadata/tools/templates/element-video-poster.sub.html b/test/wpt/tests/fetch/metadata/tools/templates/element-video-poster.sub.html
new file mode 100644
index 00000000000..9cdaf063ace
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/tools/templates/element-video-poster.sub.html
@@ -0,0 +1,62 @@
+<!DOCTYPE html>
+<!--
+[%provenance%]
+-->
+<html lang="en">
+  <meta charset="utf-8">
+  <title>HTTP headers on request for HTML "video" element "poster"</title>
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  <script src="/fetch/metadata/resources/helper.sub.js"></script>
+  <body>
+  <script>
+  'use strict';
+
+  const params = {
+    body: `
+      <svg xmlns="http://www.w3.org/2000/svg" width="123" height="123">
+        <rect fill="lime" width="123" height="123"/>
+      </svg>
+    `,
+    mime: 'image/svg+xml'
+  };
+
+  function induceRequest(t, url) {
+    var video = document.createElement('video');
+    video.setAttribute('poster', url);
+    document.body.appendChild(video);
+
+    const poll = () => {
+      if (video.clientWidth === 123) {
+        return;
+      }
+
+      return new Promise((resolve) => t.step_timeout(resolve, 0))
+        .then(poll);
+    };
+    t.add_cleanup(() => video.remove());
+
+    return poll();
+  }
+
+  {%- for subtest in subtests %}
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(t, makeRequestURL(key, [% subtest.origins %], params))
+      .then(() => retrieve(key))
+      .then((headers) => {
+        {%- if subtest.expected == none %}
+          assert_not_own_property(headers, '[%subtest.headerName%]');
+        {%- else %}
+          assert_own_property(headers, '[%subtest.headerName%]');
+          assert_array_equals(headers['[%subtest.headerName%]'], ['[%subtest.expected%]']);
+        {%- endif %}
+      });
+  }, '[%subtest.headerName%][%subtest.description | pad("start", " - ")%]');
+
+  {%- endfor %}
+  </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/fetch/metadata/tools/templates/element-video.sub.html b/test/wpt/tests/fetch/metadata/tools/templates/element-video.sub.html
new file mode 100644
index 00000000000..1b7b976d7c4
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/tools/templates/element-video.sub.html
@@ -0,0 +1,51 @@
+<!DOCTYPE html>
+<!--
+[%provenance%]
+-->
+<html lang="en">
+  <meta charset="utf-8">
+  <title>HTTP headers on request for HTML "video" element source</title>
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  <script src="/fetch/metadata/resources/helper.sub.js"></script>
+  <body>
+  <script>
+  'use strict';
+
+  function induceRequest(url, attributes) {
+    const video = document.createElement('video');
+
+    for (const [ name, value ] of Object.entries(attributes)) {
+      video.setAttribute(name, value);
+    }
+
+    return new Promise((resolve) => {
+        video.setAttribute('src', url);
+        video.onload = video.onerror = resolve;
+      });
+  }
+
+  {%- for subtest in subtests %}
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, [% subtest.origins %]),
+        [%subtest.elementAttrs | default({}) | tojson%]
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+        {%- if subtest.expected == none %}
+          assert_not_own_property(headers, '[%subtest.headerName%]');
+        {%- else %}
+          assert_own_property(headers, '[%subtest.headerName%]');
+          assert_array_equals(headers['[%subtest.headerName%]'], ['[%subtest.expected%]']);
+        {%- endif %}
+        });
+  }, '[%subtest.headerName%] - [%subtest.description | pad("end", ", ")%][%subtest.elementAttrs | collection("attributes")%]');
+
+  {%- endfor %}
+  </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/fetch/metadata/tools/templates/fetch-via-serviceworker.https.sub.html b/test/wpt/tests/fetch/metadata/tools/templates/fetch-via-serviceworker.https.sub.html
new file mode 100644
index 00000000000..eead7102008
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/tools/templates/fetch-via-serviceworker.https.sub.html
@@ -0,0 +1,88 @@
+<!DOCTYPE html>
+<!--
+[%provenance%]
+-->
+<html lang="en">
+  <meta charset="utf-8">
+  {%- if subtests|length > 10 %}
+  <meta name="timeout" content="long">
+  {%- endif %}
+  <title>HTTP headers on request using the "fetch" API and passing through a Serive Worker</title>
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  <script src="/service-workers/service-worker/resources/test-helpers.sub.js"></script>
+  <script src="/fetch/metadata/resources/helper.sub.js"></script>
+  <body>
+  <script>
+  'use strict';
+
+  const scripts = {
+    fallback: '/fetch/metadata/resources/fetch-via-serviceworker--fallback--sw.js',
+    respondWith: '/fetch/metadata/resources/fetch-via-serviceworker--respondWith--sw.js'
+  };
+
+  function induceRequest(t, url, init, script) {
+    const SCOPE = '/fetch/metadata/resources/fetch-via-serviceworker-frame.html';
+    const SCRIPT = scripts[script];
+
+    return service_worker_unregister_and_register(t, SCRIPT, SCOPE)
+      .then((registration) => {
+        t.add_cleanup(() => registration.unregister());
+
+        return wait_for_state(t, registration.installing, 'activated');
+      })
+      .then(() => with_iframe(SCOPE))
+      .then((frame) => {
+        t.add_cleanup(() => frame.remove());
+
+        return frame.contentWindow.fetch(url, init);
+      });
+  }
+
+  {%- for subtest in subtests %}
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        t,
+        makeRequestURL(key, [% subtest.origins %]),
+        [%subtest.init | default({}) | tojson%],
+        'respondWith'
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+        {%- if subtest.expected == none %}
+          assert_not_own_property(headers, '[%subtest.headerName%]');
+        {%- else %}
+          assert_own_property(headers, '[%subtest.headerName%]');
+          assert_array_equals(headers['[%subtest.headerName%]'], ['[%subtest.expected%]']);
+        {%- endif %}
+        });
+  }, '[%subtest.headerName%] - [%subtest.description | pad("end", ", ")%][%subtest.init | collection("init")%] - respondWith');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        t,
+        makeRequestURL(key, [% subtest.origins %]),
+        [%subtest.init | default({}) | tojson%],
+        'fallback'
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+        {%- if subtest.expected == none %}
+          assert_not_own_property(headers, '[%subtest.headerName%]');
+        {%- else %}
+          assert_own_property(headers, '[%subtest.headerName%]');
+          assert_array_equals(headers['[%subtest.headerName%]'], ['[%subtest.expected%]']);
+        {%- endif %}
+        });
+  }, '[%subtest.headerName%] - [%subtest.description | pad("end", ", ")%][%subtest.init | collection("init")%] - fallback');
+
+  {%- endfor %}
+
+  </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/fetch/metadata/tools/templates/fetch.sub.html b/test/wpt/tests/fetch/metadata/tools/templates/fetch.sub.html
new file mode 100644
index 00000000000..a8dc5368f8b
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/tools/templates/fetch.sub.html
@@ -0,0 +1,42 @@
+<!DOCTYPE html>
+<!--
+[%provenance%]
+-->
+<html lang="en">
+  <meta charset="utf-8">
+  <title>HTTP headers on request using the "fetch" API</title>
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  <script src="/fetch/metadata/resources/helper.sub.js"></script>
+  <body>
+  <script>
+  'use strict';
+
+  function induceRequest(url, init) {
+    return fetch(url, init);
+  }
+
+  {%- for subtest in subtests %}
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, [% subtest.origins %]),
+        [%subtest.init | default({}) | tojson%]
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+        {%- if subtest.expected == none %}
+          assert_not_own_property(headers, '[%subtest.headerName%]');
+        {%- else %}
+          assert_own_property(headers, '[%subtest.headerName%]');
+          assert_array_equals(headers['[%subtest.headerName%]'], ['[%subtest.expected%]']);
+        {%- endif %}
+        });
+  }, '[%subtest.headerName%] - [%subtest.description | pad("end", ", ")%][%subtest.init | collection("init")%]');
+
+  {%- endfor %}
+  </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/fetch/metadata/tools/templates/form-submission.sub.html b/test/wpt/tests/fetch/metadata/tools/templates/form-submission.sub.html
new file mode 100644
index 00000000000..4c9c8c50f82
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/tools/templates/form-submission.sub.html
@@ -0,0 +1,87 @@
+<!DOCTYPE html>
+<!--
+[%provenance%]
+-->
+<html lang="en">
+  <meta charset="utf-8">
+  <meta name="timeout" content="long">
+  <title>HTTP headers on request for HTML form navigation</title>
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  {%- if subtests|selectattr('userActivated')|list %}
+  <script src="/resources/testdriver.js"></script>
+  <script src="/resources/testdriver-vendor.js"></script>
+  {%- endif %}
+  <script src="/fetch/metadata/resources/helper.sub.js"></script>
+  <body>
+  <script>
+  'use strict';
+
+  function induceRequest(method, url, userActivated) {
+    const windowName = String(Math.random());
+    const form = document.createElement('form');
+    const submit = document.createElement('input');
+    submit.setAttribute('type', 'submit');
+    form.appendChild(submit);
+    const win = open('about:blank', windowName);
+    form.setAttribute('method', method);
+    form.setAttribute('action', url);
+    form.setAttribute('target', windowName);
+    document.body.appendChild(form);
+
+    // Query parameters must be expressed as form values so that they are sent
+    // with the submission of forms whose method is POST.
+    Array.from(new URL(url, location.origin).searchParams)
+      .forEach(([name, value]) => {
+        const input = document.createElement('input');
+        input.setAttribute('type', 'hidden');
+        input.setAttribute('name', name);
+        input.setAttribute('value', value);
+        form.appendChild(input);
+      });
+
+    return new Promise((resolve) => {
+        addEventListener('message', function(event) {
+          if (event.source === win) {
+            resolve();
+          }
+        });
+
+        if (userActivated) {
+          test_driver.click(submit);
+        } else {
+          submit.click();
+        }
+      })
+      .then(() => {
+        form.remove();
+        win.close();
+      });
+  }
+  const responseParams = {
+    mime: 'text/html',
+    body: `<script>opener.postMessage('done', '*')</${''}script>`
+  };
+
+  {%- for subtest in subtests %}
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, [% subtest.origins %], responseParams);
+    const userActivated = [% 'true' if subtest.userActivated else 'false' %];
+    return induceRequest('[%subtest.method | default("POST")%]', url, userActivated)
+      .then(() => retrieve(key))
+      .then((headers) => {
+        {%- if subtest.expected == none %}
+          assert_not_own_property(headers, '[%subtest.headerName%]');
+        {%- else %}
+          assert_own_property(headers, '[%subtest.headerName%]');
+          assert_array_equals(headers['[%subtest.headerName%]'], ['[%subtest.expected%]']);
+        {%- endif %}
+        });
+  }, '[%subtest.headerName%] - [%subtest.description | pad("end", " - ")%][%subtest.method | default("POST")%][%" with user activation" if subtest.userActivated%]');
+
+  {%- endfor %}
+  </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/fetch/metadata/tools/templates/header-link.sub.html b/test/wpt/tests/fetch/metadata/tools/templates/header-link.sub.html
new file mode 100644
index 00000000000..2831f221d5c
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/tools/templates/header-link.sub.html
@@ -0,0 +1,56 @@
+<!DOCTYPE html>
+<!--
+[%provenance%]
+-->
+<html lang="en">
+  <meta charset="utf-8">
+  <title>HTTP headers on request for HTTP "Link" header</title>
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  <script src="/fetch/metadata/resources/helper.sub.js"></script>
+  <body>
+  <script>
+  'use strict';
+
+  function induceRequest(url, rel, test) {
+    const iframe = document.createElement('iframe');
+
+    iframe.setAttribute(
+      'src',
+      '/fetch/metadata/resources/header-link.py' +
+        `?location=${encodeURIComponent(url)}&rel=${rel}`
+    );
+
+    document.body.appendChild(iframe);
+    test.add_cleanup(() => iframe.remove());
+
+    return new Promise((resolve) => {
+        iframe.onload = iframe.onerror = resolve;
+      });
+  }
+
+  {%- for subtest in subtests %}
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, [% subtest.origins %], {mime: 'text/html'}),
+        '[%subtest.rel%]',
+        t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+        {%- if subtest.expected == none %}
+          assert_not_own_property(headers, '[%subtest.headerName%]');
+        {%- else %}
+          assert_own_property(headers, '[%subtest.headerName%]');
+          assert_array_equals(headers['[%subtest.headerName%]'], ['[%subtest.expected%]']);
+        {%- endif %}
+        });
+  }, '[%subtest.headerName%] rel=[%subtest.rel%][%subtest.description | pad("start", " - ")%]');
+
+  {%- endfor %}
+  </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/fetch/metadata/tools/templates/header-refresh.optional.sub.html b/test/wpt/tests/fetch/metadata/tools/templates/header-refresh.optional.sub.html
new file mode 100644
index 00000000000..ec963d5cc00
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/tools/templates/header-refresh.optional.sub.html
@@ -0,0 +1,59 @@
+<!DOCTYPE html>
+<!--
+[%provenance%]
+-->
+<html lang="en">
+  <meta charset="utf-8">
+  {%- if subtests|length > 10 %}
+  <meta name="timeout" content="long">
+  {%- endif %}
+  <title>HTTP headers on request for HTTP "Refresh" header</title>
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  <script src="/fetch/metadata/resources/helper.sub.js"></script>
+  <body>
+  <script>
+  'use strict';
+
+  function induceRequest(url, test) {
+    const win = window.open();
+    test.add_cleanup(() => win.close());
+
+    win.location = `/common/refresh.py?location=${encodeURIComponent(url)}`
+
+    return new Promise((resolve) => {
+      addEventListener('message', (event) => {
+          if (event.source === win) {
+            resolve();
+          }
+        });
+    });
+  }
+
+  const responseParams = {
+    mime: 'text/html',
+    body: `<script>opener.postMessage(0, '*')</${''}script>`
+  };
+  {%- for subtest in subtests %}
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(key, [% subtest.origins %], responseParams), t
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+        {%- if subtest.expected == none %}
+          assert_not_own_property(headers, '[%subtest.headerName%]');
+        {%- else %}
+          assert_own_property(headers, '[%subtest.headerName%]');
+          assert_array_equals(headers['[%subtest.headerName%]'], ['[%subtest.expected%]']);
+        {%- endif %}
+        });
+  }, '[%subtest.headerName%][%subtest.description | pad("start", " - ")%]');
+
+  {%- endfor %}
+  </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/fetch/metadata/tools/templates/script-module-import-dynamic.sub.html b/test/wpt/tests/fetch/metadata/tools/templates/script-module-import-dynamic.sub.html
new file mode 100644
index 00000000000..653d3cdec44
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/tools/templates/script-module-import-dynamic.sub.html
@@ -0,0 +1,35 @@
+<!DOCTYPE html>
+<!--
+[%provenance%]
+-->
+<html lang="en">
+  <meta charset="utf-8">
+  <title>HTTP headers on request for dynamic ECMAScript module import</title>
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  <script src="/fetch/metadata/resources/helper.sub.js"></script>
+  <script type="module">
+  'use strict';
+  {%- for subtest in subtests %}
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, [% subtest.origins %], { mime: 'application/javascript' }
+    );
+
+    return import(url)
+      .then(() => retrieve(key))
+      .then((headers) => {
+        {%- if subtest.expected == none %}
+          assert_not_own_property(headers, '[%subtest.headerName%]');
+        {%- else %}
+          assert_own_property(headers, '[%subtest.headerName%]');
+          assert_array_equals(headers['[%subtest.headerName%]'], ['[%subtest.expected%]']);
+        {%- endif %}
+        });
+  }, '[%subtest.headerName%][%subtest.description | pad("start", " - ")%]');
+
+  {%- endfor %}
+  </script>
+</html>
diff --git a/test/wpt/tests/fetch/metadata/tools/templates/script-module-import-static.sub.html b/test/wpt/tests/fetch/metadata/tools/templates/script-module-import-static.sub.html
new file mode 100644
index 00000000000..c8d5f9532a9
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/tools/templates/script-module-import-static.sub.html
@@ -0,0 +1,53 @@
+<!DOCTYPE html>
+<!--
+[%provenance%]
+-->
+<html lang="en">
+  <meta charset="utf-8">
+  <title>HTTP headers on request for static ECMAScript module import</title>
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  <script src="/fetch/metadata/resources/helper.sub.js"></script>
+  <body>
+  <script>
+  'use strict';
+
+  function induceRequest(url) {
+    const script = document.createElement('script');
+    script.setAttribute('type', 'module');
+    script.setAttribute(
+      'src',
+      '/fetch/metadata/resources/es-module.sub.js?moduleId=' + encodeURIComponent(url)
+    );
+
+    return new Promise((resolve, reject) => {
+        script.onload = resolve;
+        script.onerror = () => reject('Failed to load script');
+        document.body.appendChild(script);
+      })
+      .then(() => script.remove());
+  }
+  {%- for subtest in subtests %}
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        makeRequestURL(
+          key, [% subtest.origins %], { mime: 'application/javascript' }
+        )
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+        {%- if subtest.expected == none %}
+          assert_not_own_property(headers, '[%subtest.headerName%]');
+        {%- else %}
+          assert_own_property(headers, '[%subtest.headerName%]');
+          assert_array_equals(headers['[%subtest.headerName%]'], ['[%subtest.expected%]']);
+        {%- endif %}
+        });
+  }, '[%subtest.headerName%][%subtest.description | pad("start",  " - ")%]');
+
+  {%- endfor %}
+  </script>
+</html>
diff --git a/test/wpt/tests/fetch/metadata/tools/templates/serviceworker.https.sub.html b/test/wpt/tests/fetch/metadata/tools/templates/serviceworker.https.sub.html
new file mode 100644
index 00000000000..82843255469
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/tools/templates/serviceworker.https.sub.html
@@ -0,0 +1,72 @@
+<!DOCTYPE html>
+<!--
+[%provenance%]
+-->
+<!DOCTYPE html>
+<html lang="en">
+  <meta charset="utf-8">
+  <title>HTTP headers on request for Service Workers</title>
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  <script src="/fetch/metadata/resources/helper.sub.js"></script>
+  <body>
+  <script>
+  'use strict';
+
+  function induceRequest(t, url, options, event, clear) {
+    // Register a service worker and check the request header.
+    return navigator.serviceWorker.register(url, options)
+      .then((registration) => {
+        t.add_cleanup(() => registration.unregister());
+        if (event === 'register') {
+          return;
+        }
+        return clear().then(() => registration.update());
+      });
+  }
+
+  {%- for subtest in subtests %}
+  {%- set origin = subtest.origins[0]|default('httpsOrigin') %}
+  {%- if origin == 'httpsOrigin' or not origin %}
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, [% subtest.origins %], { mime: 'application/javascript' }
+    );
+
+    return induceRequest(t, url, [%subtest.options | default({}) | tojson%], 'register')
+      .then(() => retrieve(key))
+      .then((headers) => {
+        {%- if subtest.expected == none %}
+          assert_not_own_property(headers, '[%subtest.headerName%]');
+        {%- else %}
+          assert_own_property(headers, '[%subtest.headerName%]');
+          assert_array_equals(headers['[%subtest.headerName%]'], ['[%subtest.expected%]']);
+        {%- endif %}
+        });
+  }, '[%subtest.headerName%] - [%subtest.description | pad("end", ", ")%][%subtest.options | collection("options")%] - registration');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, [% subtest.origins %], { mime: 'application/javascript' }
+    );
+
+    return induceRequest(t, url, [%subtest.options | default({}) | tojson%], 'update', () => retrieve(key))
+      .then(() => retrieve(key))
+      .then((headers) => {
+        {%- if subtest.expected == none %}
+          assert_not_own_property(headers, '[%subtest.headerName%]');
+        {%- else %}
+          assert_own_property(headers, '[%subtest.headerName%]');
+          assert_array_equals(headers['[%subtest.headerName%]'], ['[%subtest.expected%]']);
+        {%- endif %}
+        });
+  }, '[%subtest.headerName%] - [%subtest.description | pad("end", ", ")%][%subtest.options | collection("options")%] - updating');
+
+  {%- endif %}
+  {%- endfor %}
+  </script>
+</body>
+</html>
diff --git a/test/wpt/tests/fetch/metadata/tools/templates/svg-image.sub.html b/test/wpt/tests/fetch/metadata/tools/templates/svg-image.sub.html
new file mode 100644
index 00000000000..52f7806b33c
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/tools/templates/svg-image.sub.html
@@ -0,0 +1,75 @@
+<!DOCTYPE html>
+<!--
+[%provenance%]
+-->
+<html lang="en">
+  <meta charset="utf-8">
+  {%- if subtests|length > 10 %}
+  <meta name="timeout" content="long">
+  {%- endif %}
+  <title>HTTP headers on request for SVG "image" element source</title>
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  <script src="/fetch/metadata/resources/helper.sub.js"></script>
+  <body>
+  <script>
+  'use strict';
+
+  const params = {
+    body: `
+      <svg xmlns="http://www.w3.org/2000/svg" width="123" height="123">
+        <rect fill="lime" width="123" height="123"/>
+      </svg>
+    `,
+    mime: 'image/svg+xml'
+  };
+
+  function induceRequest(t, url, attributes) {
+    const svg = document.createElementNS("http://www.w3.org/2000/svg", "svg");
+    svg.setAttributeNS(
+      "http://www.w3.org/2000/xmlns/",
+      "xmlns:xlink",
+      "http://www.w3.org/1999/xlink"
+    );
+    const image = document.createElementNS("http://www.w3.org/2000/svg", "image");
+    image.setAttribute("href", url);
+    svg.appendChild(image);
+
+    for (const [ name, value ] of Object.entries(attributes)) {
+      image.setAttribute(name, value);
+    }
+
+    document.body.appendChild(svg);
+    t.add_cleanup(() => svg.remove());
+
+    return new Promise((resolve, reject) => {
+      image.onload = resolve;
+      image.onerror = reject;
+    });
+  }
+
+  {%- for subtest in subtests %}
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+
+    return induceRequest(
+        t,
+        makeRequestURL(key, [% subtest.origins %], params),
+        [%subtest.elementAttrs | default({}) | tojson%]
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+        {%- if subtest.expected == none %}
+          assert_not_own_property(headers, '[%subtest.headerName%]');
+        {%- else %}
+          assert_own_property(headers, '[%subtest.headerName%]');
+          assert_array_equals(headers['[%subtest.headerName%]'], ['[%subtest.expected%]']);
+        {%- endif %}
+      });
+  }, '[%subtest.headerName%][%subtest.description | pad("start", " - ")%] [%subtest.elementAttrs | collection("attributes")%]');
+
+  {%- endfor %}
+  </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/fetch/metadata/tools/templates/window-history.sub.html b/test/wpt/tests/fetch/metadata/tools/templates/window-history.sub.html
new file mode 100644
index 00000000000..286d019887d
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/tools/templates/window-history.sub.html
@@ -0,0 +1,134 @@
+<!DOCTYPE html>
+<!--
+[%provenance%]
+-->
+<html lang="en">
+  <meta charset="utf-8">
+  {%- if subtests|length > 10 %}
+  <meta name="timeout" content="long">
+  {%- endif %}
+  <title>HTTP headers on request for navigation via the HTML History API</title>
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  {%- if subtests|selectattr('userActivated')|list %}
+  <script src="/resources/testdriver.js"></script>
+  <script src="/resources/testdriver-vendor.js"></script>
+  {%- endif %}
+  <script src="/fetch/metadata/resources/helper.sub.js"></script>
+  <body>
+  <script>
+  'use strict';
+
+  const whenDone = (win) => {
+    return new Promise((resolve) => {
+      addEventListener('message', function handle(event) {
+        if (event.source === win) {
+          resolve();
+          removeEventListener('message', handle);
+        }
+      });
+    })
+  };
+
+  /**
+   * Prime the UA's session history such that the location of the request is
+   * immediately behind the current entry. Because the location may not be
+   * same-origin with the current browsing context, this must be done via a
+   * true navigation and not, e.g. the `history.pushState` API. The initial
+   * navigation will alter the WPT server's internal state; in order to avoid
+   * false positives, clear that state prior to initiating the second
+   * navigation via `history.back`.
+   */
+  function induceBackRequest(url, test, clear) {
+    const win = window.open(url);
+
+    test.add_cleanup(() => win.close());
+
+    return whenDone(win)
+      .then(clear)
+      .then(() => win.history.back())
+      .then(() => whenDone(win));
+  }
+
+  /**
+   * Prime the UA's session history such that the location of the request is
+   * immediately ahead of the current entry. Because the location may not be
+   * same-origin with the current browsing context, this must be done via a
+   * true navigation and not, e.g. the `history.pushState` API. The initial
+   * navigation will alter the WPT server's internal state; in order to avoid
+   * false positives, clear that state prior to initiating the second
+   * navigation via `history.forward`.
+   */
+  function induceForwardRequest(url, test, clear) {
+    const win = window.open(messageOpenerUrl);
+
+    test.add_cleanup(() => win.close());
+
+    return whenDone(win)
+      .then(() => win.location = url)
+      .then(() => whenDone(win))
+      .then(clear)
+      .then(() => win.history.go(-2))
+      .then(() => whenDone(win))
+      .then(() => win.history.forward())
+      .then(() => whenDone(win));
+  }
+
+  const messageOpenerUrl = new URL(
+    '/fetch/metadata/resources/message-opener.html', location
+  );
+  // For these tests to function, replacement must *not* be enabled during
+  // navigation. Assignment must therefore take place after the document has
+  // completely loaded [1]. This event is not directly observable, but it is
+  // scheduled as a task immediately following the global object's `load`
+  // event [2]. By queuing a task during the dispatch of the `load` event,
+  // navigation can be consistently triggered without replacement.
+  //
+  // [1] https://html.spec.whatwg.org/multipage/history.html#location-object-setter-navigate
+  // [2] https://html.spec.whatwg.org/multipage/parsing.html#the-end
+  const responseParams = {
+    mime: 'text/html',
+    body: `<script>
+      window.addEventListener('load', () => {
+        set`+`Timeout(() => location.assign('${messageOpenerUrl}'));
+      });
+    <`+`/script>`
+  };
+  {%- for subtest in subtests %}
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, [% subtest.origins %], responseParams);
+
+    return induceBackRequest(url, t, () => retrieve(key))
+      .then(() => retrieve(key))
+      .then((headers) => {
+        {%- if subtest.expected == none %}
+          assert_not_own_property(headers, '[%subtest.headerName%]');
+        {%- else %}
+          assert_own_property(headers, '[%subtest.headerName%]');
+          assert_array_equals(headers['[%subtest.headerName%]'], ['[%subtest.expected%]']);
+        {%- endif %}
+        });
+  }, '[%subtest.headerName%] - [%subtest.description | pad("right", " - ")%]history.back[%subtest.api%][% " with user activation" if subtest.userActivated%]');
+
+  promise_test((t) => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, [% subtest.origins %], responseParams);
+
+    return induceForwardRequest(url, t, () => retrieve(key))
+      .then(() => retrieve(key))
+      .then((headers) => {
+        {%- if subtest.expected == none %}
+          assert_not_own_property(headers, '[%subtest.headerName%]');
+        {%- else %}
+          assert_own_property(headers, '[%subtest.headerName%]');
+          assert_array_equals(headers['[%subtest.headerName%]'], ['[%subtest.expected%]']);
+        {%- endif %}
+        });
+  }, '[%subtest.headerName%] - [%subtest.description | pad("right", " - ")%]history.forward[%subtest.api%][% " with user activation" if subtest.userActivated%]');
+
+  {%- endfor %}
+  </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/fetch/metadata/tools/templates/window-location.sub.html b/test/wpt/tests/fetch/metadata/tools/templates/window-location.sub.html
new file mode 100644
index 00000000000..96f39123616
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/tools/templates/window-location.sub.html
@@ -0,0 +1,128 @@
+<!DOCTYPE html>
+<!--
+[%provenance%]
+-->
+<html lang="en">
+  <meta charset="utf-8">
+  {%- if subtests|length > 10 %}
+  <meta name="timeout" content="long">
+  {%- endif %}
+  <title>HTTP headers on request for navigation via the HTML Location API</title>
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  {%- if subtests|selectattr('userActivated')|list %}
+  <script src="/resources/testdriver.js"></script>
+  <script src="/resources/testdriver-vendor.js"></script>
+  {%- endif %}
+  <script src="/fetch/metadata/resources/helper.sub.js"></script>
+  <body>
+  <script>
+  'use strict';
+
+  function induceRequest(url, navigate, userActivated) {
+    const win = window.open();
+
+    return new Promise((resolve) => {
+        addEventListener('message', function(event) {
+          if (event.source === win) {
+            resolve();
+          }
+        });
+
+        if (userActivated) {
+          test_driver.bless('enable user activation', () => {
+            navigate(win, url);
+          });
+        } else {
+          navigate(win, url);
+        }
+      })
+      .then(() => win.close());
+  }
+
+  const responseParams = {
+    mime: 'text/html',
+    body: `<script>opener.postMessage('done', '*')</${''}script>`
+  };
+  {%- for subtest in subtests %}
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, [% subtest.origins %], responseParams);
+
+    const navigate = (win, path) => {
+      win.location = path;
+    };
+    return induceRequest(url, navigate, [% 'true' if subtest.userActivated else 'false' %])
+      .then(() => retrieve(key))
+      .then((headers) => {
+        {%- if subtest.expected == none %}
+          assert_not_own_property(headers, '[%subtest.headerName%]');
+        {%- else %}
+          assert_own_property(headers, '[%subtest.headerName%]');
+          assert_array_equals(headers['[%subtest.headerName%]'], ['[%subtest.expected%]']);
+        {%- endif %}
+        });
+  }, '[%subtest.headerName%] - [%subtest.description | pad("end", " - ")%]location[% " with user activation" if subtest.userActivated%]');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, [% subtest.origins %], responseParams);
+
+    const navigate = (win, path) => {
+      win.location.href = path;
+    };
+    return induceRequest(url, navigate, [% 'true' if subtest.userActivated else 'false' %])
+      .then(() => retrieve(key))
+      .then((headers) => {
+        {%- if subtest.expected == none %}
+          assert_not_own_property(headers, '[%subtest.headerName%]');
+        {%- else %}
+          assert_own_property(headers, '[%subtest.headerName%]');
+          assert_array_equals(headers['[%subtest.headerName%]'], ['[%subtest.expected%]']);
+        {%- endif %}
+        });
+  }, '[%subtest.headerName%] - [%subtest.description | pad("end", " - ")%]location.href[% " with user activation" if subtest.userActivated%]');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, [% subtest.origins %], responseParams);
+
+    const navigate = (win, path) => {
+      win.location.assign(path);
+    };
+    return induceRequest(url, navigate, [% 'true' if subtest.userActivated else 'false' %])
+      .then(() => retrieve(key))
+      .then((headers) => {
+        {%- if subtest.expected == none %}
+          assert_not_own_property(headers, '[%subtest.headerName%]');
+        {%- else %}
+          assert_own_property(headers, '[%subtest.headerName%]');
+          assert_array_equals(headers['[%subtest.headerName%]'], ['[%subtest.expected%]']);
+        {%- endif %}
+        });
+  }, '[%subtest.headerName%] - [%subtest.description | pad("end", " - ")%]location.assign[% " with user activation" if subtest.userActivated%]');
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(key, [% subtest.origins %], responseParams);
+
+    const navigate = (win, path) => {
+      win.location.replace(path);
+    };
+    return induceRequest(url, navigate, [% 'true' if subtest.userActivated else 'false' %])
+      .then(() => retrieve(key))
+      .then((headers) => {
+        {%- if subtest.expected == none %}
+          assert_not_own_property(headers, '[%subtest.headerName%]');
+        {%- else %}
+          assert_own_property(headers, '[%subtest.headerName%]');
+          assert_array_equals(headers['[%subtest.headerName%]'], ['[%subtest.expected%]']);
+        {%- endif %}
+        });
+  }, '[%subtest.headerName%] - [%subtest.description | pad("end", " - ")%]location.replace[% " with user activation" if subtest.userActivated%]');
+
+  {%- endfor %}
+  </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/fetch/metadata/tools/templates/worker-dedicated-constructor.sub.html b/test/wpt/tests/fetch/metadata/tools/templates/worker-dedicated-constructor.sub.html
new file mode 100644
index 00000000000..fede5965d3a
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/tools/templates/worker-dedicated-constructor.sub.html
@@ -0,0 +1,49 @@
+<!DOCTYPE html>
+<!--
+[%provenance%]
+-->
+<html lang="en">
+  <meta charset="utf-8">
+  <title>HTTP headers on request for dedicated worker via the "Worker" constructor</title>
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  <script src="/fetch/metadata/resources/helper.sub.js"></script>
+  <script type="module">
+  'use strict';
+  function induceRequest(url, options) {
+    return new Promise((resolve, reject) => {
+      const worker = new Worker(url, options);
+      worker.onmessage = resolve;
+      worker.onerror = reject;
+    });
+  }
+
+  {%- for subtest in subtests %}
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key,
+      [% subtest.origins %],
+      { mime: 'application/javascript', body: 'postMessage("")' }
+    );
+
+    return induceRequest(url
+      {%- if subtest.options -%}
+        , [% subtest.options | tojson %]
+      {%- endif -%}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+        {%- if subtest.expected == none %}
+          assert_not_own_property(headers, '[%subtest.headerName%]');
+        {%- else %}
+          assert_own_property(headers, '[%subtest.headerName%]');
+          assert_array_equals(headers['[%subtest.headerName%]'], ['[%subtest.expected%]']);
+        {%- endif %}
+        });
+  }, '[%subtest.headerName%] - [%subtest.description | pad("end", ", ")%][%subtest.options|collection("options")%]');
+
+  {%- endfor %}
+  </script>
+</html>
diff --git a/test/wpt/tests/fetch/metadata/tools/templates/worker-dedicated-importscripts.sub.html b/test/wpt/tests/fetch/metadata/tools/templates/worker-dedicated-importscripts.sub.html
new file mode 100644
index 00000000000..93e6374d54b
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/tools/templates/worker-dedicated-importscripts.sub.html
@@ -0,0 +1,54 @@
+<!DOCTYPE html>
+<!--
+[%provenance%]
+-->
+<html lang="en">
+  <meta charset="utf-8">
+  <title>HTTP headers on request for dedicated worker via the "importScripts" API</title>
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  <script src="/fetch/metadata/resources/helper.sub.js"></script>
+  <script type="module">
+  'use strict';
+  function induceRequest(url, options) {
+    const src = `
+      importScripts('${url}');
+      postMessage('done');
+    `;
+    const workerUrl = URL.createObjectURL(
+      new Blob([src], { type: 'application/javascript' })
+    );
+    return new Promise((resolve, reject) => {
+      const worker = new Worker(workerUrl, options);
+      worker.onmessage = resolve;
+      worker.onerror = reject;
+    });
+  }
+
+  {%- for subtest in subtests %}
+
+  promise_test(() => {
+    const key = '{{uuid()}}';
+    const url = makeRequestURL(
+      key, [% subtest.origins %], { mime: 'application/javascript' }
+    );
+
+    return induceRequest(url
+      {%- if subtest.options -%}
+        , [% subtest.options | tojson %]
+      {%- endif -%}
+      )
+      .then(() => retrieve(key))
+      .then((headers) => {
+        {%- if subtest.expected == none %}
+          assert_not_own_property(headers, '[%subtest.headerName%]');
+        {%- else %}
+          assert_own_property(headers, '[%subtest.headerName%]');
+          assert_array_equals(headers['[%subtest.headerName%]'], ['[%subtest.expected%]']);
+        {%- endif %}
+        });
+  }, '[%subtest.headerName%][%subtest.description | pad("start", " - ")%]');
+
+  {%- endfor %}
+  </script>
+</html>
diff --git a/test/wpt/tests/fetch/metadata/track.https.sub.html b/test/wpt/tests/fetch/metadata/track.https.sub.html
new file mode 100644
index 00000000000..346798fdc0e
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/track.https.sub.html
@@ -0,0 +1,119 @@
+<!DOCTYPE html>
+
+<link rel="author" href="mtrzos@google.com" title="Maciek Trzos">
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=/fetch/metadata/resources/helper.js></script>
+<script src=/common/utils.js></script>
+<body>
+</body>
+<script>
+  let nonce = token();
+
+  function createVideoElement() {
+    let el = document.createElement('video');
+    el.src = "/media/movie_5.mp4";
+    el.setAttribute("controls", "");
+    el.setAttribute("crossorigin", "");
+    return el;
+  }
+
+  function createTrack() {
+    let el = document.createElement("track");
+    el.setAttribute("default", "");
+    el.setAttribute("kind", "captions");
+    el.setAttribute("srclang", "en");
+    return el;
+  }
+
+  promise_test(t => {
+    return new Promise((resolve, reject) => {
+      let key = "track-same-origin" + nonce;
+      let video = createVideoElement();
+      let el = createTrack();
+      el.src = "https://{{host}}:{{ports[https][0]}}/fetch/metadata/resources/record-header.py?file=" + key;
+      el.onload = t.step_func(_ => {
+        expected = {
+          "site": "same-origin",
+          "user": "",
+          "mode": "cors", // Because the `video` element has `crossorigin`
+          "dest": "track"
+        };
+        validate_expectations(key, expected, "Same-Origin track")
+            .then(_ => resolve());
+      });
+      video.appendChild(el);
+      document.body.appendChild(video);
+    });
+  }, "Same-Origin track");
+
+  promise_test(t => {
+    return new Promise((resolve, reject) => {
+      let key = "track-same-site" + nonce;
+      let video = createVideoElement();
+      let el = createTrack();
+      el.src = "https://{{hosts[][www]}}:{{ports[https][0]}}/fetch/metadata/resources/record-header.py?file=" + key;
+      el.onload = t.step_func(_ => {
+        expected = {
+          "site": "same-site",
+          "user": "",
+          "mode": "cors", // Because the `video` element has `crossorigin`
+          "dest": "track"
+        };
+        validate_expectations(key, expected, "Same-Site track")
+            .then(resolve)
+            .catch(reject);
+
+      });
+      video.appendChild(el);
+      document.body.appendChild(video);
+    });
+  }, "Same-Site track");
+
+  promise_test(t => {
+    return new Promise((resolve, reject) => {
+      let key = "track-cross-site" + nonce;
+      let video = createVideoElement();
+      let el = createTrack();
+      el.src = "https://{{hosts[alt][www]}}:{{ports[https][0]}}/fetch/metadata/resources/record-header.py?file=" + key;
+      el.onload = t.step_func(_ => {
+        expected = {
+          "site": "cross-site",
+          "user": "",
+          "mode": "cors", // Because the `video` element has `crossorigin`
+          "dest": "track"
+        };
+        validate_expectations(key, expected,"Cross-Site track")
+            .then(resolve)
+            .catch(reject);
+      });
+      video.appendChild(el);
+      document.body.appendChild(video);
+    });
+  }, "Cross-Site track");
+
+  promise_test(t => {
+    return new Promise((resolve, reject) => {
+      let key = "track-same-origin-cors" + nonce;
+      let video = createVideoElement();
+
+      // Unset `crossorigin` to change the CORS mode:
+      video.crossOrigin = undefined;
+
+      let el = createTrack();
+      el.src = "https://{{host}}:{{ports[https][0]}}/fetch/metadata/resources/record-header.py?file=" + key;
+      el.onload = t.step_func(_ => {
+        expected = {
+          "site":"same-origin",
+          "user":"",
+          "mode": "same-origin",
+          "dest": "track"
+        };
+        validate_expectations(key, expected, "Same-Origin, CORS track")
+            .then(_ => resolve());
+      });
+      video.appendChild(el);
+      document.body.appendChild(video);
+    });
+  }, "Same-Origin, CORS track");
+</script>
diff --git a/test/wpt/tests/fetch/metadata/trailing-dot.https.sub.any.js b/test/wpt/tests/fetch/metadata/trailing-dot.https.sub.any.js
new file mode 100644
index 00000000000..5e32fc4e7f6
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/trailing-dot.https.sub.any.js
@@ -0,0 +1,30 @@
+// META: global=window,worker
+// META: script=/fetch/metadata/resources/helper.js
+
+// Site
+promise_test(t => {
+  return validate_expectations_custom_url("https://{{host}}.:{{ports[https][0]}}/fetch/metadata/resources/echo-as-json.py", {}, {
+          "site": "cross-site",
+          "user": "",
+          "mode": "cors",
+          "dest": "empty"
+        }, "Fetching a resource from the same origin, but spelled with a trailing dot.");
+}, "Fetching a resource from the same origin, but spelled with a trailing dot.");
+
+promise_test(t => {
+  return validate_expectations_custom_url("https://{{hosts[][www]}}.:{{ports[https][0]}}/fetch/metadata/resources/echo-as-json.py", {}, {
+          "site": "cross-site",
+          "user": "",
+          "mode": "cors",
+          "dest": "empty"
+        }, "Fetching a resource from the same site, but spelled with a trailing dot.");
+}, "Fetching a resource from the same site, but spelled with a trailing dot.");
+
+promise_test(t => {
+  return validate_expectations_custom_url("https://{{hosts[alt][www]}}.:{{ports[https][0]}}/fetch/metadata/resources/echo-as-json.py", {}, {
+          "site": "cross-site",
+          "user": "",
+          "mode": "cors",
+          "dest": "empty"
+        }, "Fetching a resource from a cross-site host, spelled with a trailing dot.");
+}, "Fetching a resource from a cross-site host, spelled with a trailing dot.");
diff --git a/test/wpt/tests/fetch/metadata/unload.https.sub.html b/test/wpt/tests/fetch/metadata/unload.https.sub.html
new file mode 100644
index 00000000000..bc26048c810
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/unload.https.sub.html
@@ -0,0 +1,64 @@
+<!DOCTYPE html>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=/resources/testdriver.js></script>
+<script src=/resources/testdriver-vendor.js></script>
+<script src=/fetch/metadata/resources/helper.js></script>
+<script src=/common/utils.js></script>
+<body>
+<script>
+  // The test
+  // 1. Creates a same-origin iframe
+  // 2. Adds to the iframe an unload handler that will
+  //    trigger a request to <unload_request_url>/.../record-header.py...
+  // 3. Navigate the iframe to a cross-origin url (to data: url)
+  // 4. Waits until the request goes through
+  // 5. Verifies Sec-Fetch-Site request header of the request.
+  //
+  // This is a regression test for https://crbug.com/986577.
+  function create_test(unload_request_origin, expectations) {
+    async_test(t => {
+      // STEP 1: Create an iframe.
+      let nonce = token();
+      let key = "unload-test-" + nonce;
+      let url = unload_request_origin +
+          "/fetch/metadata/resources/record-header.py?file=" + key;
+      let i = document.createElement('iframe');
+      i.src = 'resources/unload-with-beacon.html';
+      i.onload = () => {
+          // STEP 2: Ask the iframe to add an unload handler.
+          i.contentWindow.postMessage(url, '*');
+      };
+      window.addEventListener('message', e => {
+          // STEP 3: Navigate the iframe away
+          i.contentWindow.location = 'data:text/html,DONE';
+      });
+      document.body.appendChild(i);
+
+      // STEPS 4 and 5: Wait for the beacon to go through and verify
+      // the request headers.
+      function wait_and_verify() {
+          t.step_timeout(() => {
+              fetch("resources/record-header.py?retrieve=true&file=" + key)
+                  .then(response => response.text())
+                  .then(text => t.step(() => {
+                      if (text == 'No header has been recorded') {
+                        wait_and_verify();
+                        return;
+                      }
+                      assert_header_equals(text, expectations);
+                      t.done();
+                  }))
+          }, 200);
+      }
+      wait_and_verify();
+    }, "Fetch from an unload handler");
+  }
+
+  create_test("https://{{host}}:{{ports[https][0]}}", {
+    "site": "same-origin",
+    "user": "",
+    "mode": "no-cors",
+    "dest": "empty"
+  });
+</script>
diff --git a/test/wpt/tests/fetch/metadata/window-open.https.sub.html b/test/wpt/tests/fetch/metadata/window-open.https.sub.html
new file mode 100644
index 00000000000..94ba76a19ff
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/window-open.https.sub.html
@@ -0,0 +1,199 @@
+<!DOCTYPE html>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=/resources/testdriver.js></script>
+<script src=/resources/testdriver-vendor.js></script>
+<script src=/fetch/metadata/resources/helper.js></script>
+<body>
+<script>
+  // Forced navigations:
+  async_test(t => {
+    let w = window.open("https://{{host}}:{{ports[https][0]}}/fetch/metadata/resources/post-to-owner.py");
+    t.add_cleanup(_ => w.close());
+    window.addEventListener('message', t.step_func(e => {
+      if (e.source != w)
+        return;
+
+      assert_header_equals(e.data, {
+        "site": "same-origin",
+        "user": "",
+        "mode": "navigate",
+        "dest": "document"
+      }, "Same-origin window, forced");
+      t.done();
+    }));
+  }, "Same-origin window, forced");
+
+  async_test(t => {
+    let w = window.open("https://{{hosts[][www]}}:{{ports[https][0]}}/fetch/metadata/resources/post-to-owner.py");
+    t.add_cleanup(_ => w.close());
+    window.addEventListener('message', t.step_func(e => {
+      if (e.source != w)
+        return;
+
+      assert_header_equals(e.data, {
+        "site": "same-site",
+        "user": "",
+        "mode": "navigate",
+        "dest": "document"
+      }, "Same-site window, forced");
+      t.done();
+    }));
+  }, "Same-site window, forced");
+
+  async_test(t => {
+    let w = window.open("https://{{hosts[alt][www]}}:{{ports[https][0]}}/fetch/metadata/resources/post-to-owner.py");
+    t.add_cleanup(_ => w.close());
+    window.addEventListener('message', t.step_func(e => {
+      if (e.source != w)
+        return;
+
+      assert_header_equals(e.data, {
+        "site": "cross-site",
+        "user": "",
+        "mode": "navigate",
+        "dest": "document"
+      }, "Cross-site window, forced");
+      t.done();
+    }));
+  }, "Cross-site window, forced");
+
+  async_test(t => {
+    let w = window.open("https://{{host}}:{{ports[https][0]}}/fetch/metadata/resources/post-to-owner.py");
+    t.add_cleanup(_ => w.close());
+    let messages = 0;
+    window.addEventListener('message', t.step_func(e => {
+      messages++;
+      if (e.source != w)
+        return;
+
+      assert_header_equals(e.data, {
+        "site": "same-origin",
+        "user": "",
+        "mode": "navigate",
+        "dest": "document"
+      }, "Same-origin window, forced, reloaded");
+
+      if (messages == 1) {
+        w.location.reload();
+      } else {
+        t.done();
+      }
+    }));
+  }, "Same-origin window, forced, reloaded");
+
+  async_test(t => {
+    let w = window.open("https://{{hosts[][www]}}:{{ports[https][0]}}/fetch/metadata/resources/post-to-owner.py");
+    t.add_cleanup(_ => w.close());
+    let messages = 0;
+    window.addEventListener('message', t.step_func(e => {
+      messages++;
+      if (e.source != w)
+        return;
+
+      assert_header_equals(e.data, {
+        "site": "same-site",
+        "user": "",
+        "mode": "navigate",
+        "dest": "document"
+      }, "Same-site window, forced, reloaded");
+
+      if (messages == 1) {
+        w.location.reload();
+      } else {
+        t.done();
+      }
+    }));
+  }, "Same-site window, forced, reloaded");
+
+  async_test(t => {
+    let w = window.open("https://{{hosts[alt][www]}}:{{ports[https][0]}}/fetch/metadata/resources/post-to-owner.py");
+    t.add_cleanup(_ => w.close());
+    let messages = 0;
+    window.addEventListener('message', t.step_func(e => {
+      messages++;
+      if (e.source != w)
+        return;
+
+      assert_header_equals(e.data, {
+        "site": "cross-site",
+        "user": "",
+        "mode": "navigate",
+        "dest": "document"
+      }, "Cross-site window, forced, reloaded");
+
+      if (messages == 1) {
+        w.location.reload();
+      } else {
+        t.done();
+      }
+    }));
+  }, "Cross-site window, forced, reloaded");
+
+  // User-activated navigations:
+  async_test(t => {
+    let b = document.createElement('button');
+    b.onclick = t.step_func(_ => {
+      let w = window.open("https://{{host}}:{{ports[https][0]}}/fetch/metadata/resources/post-to-owner.py");
+      t.add_cleanup(_ => w.close());
+      window.addEventListener('message', t.step_func(e => {
+        if (e.source != w)
+          return;
+
+        assert_header_equals(e.data, {
+          "site": "same-origin",
+          "user": "?1",
+          "mode": "navigate",
+          "dest": "document"
+        }, "Same-origin window, user-activated");
+        t.done();
+      }));
+    });
+    document.body.appendChild(b);
+    test_driver.click(b);
+  }, "Same-origin window, user-activated");
+
+  async_test(t => {
+    let b = document.createElement('button');
+    b.onclick = t.step_func(_ => {
+      let w = window.open("https://{{hosts[][www]}}:{{ports[https][0]}}/fetch/metadata/resources/post-to-owner.py");
+      t.add_cleanup(_ => w.close());
+      window.addEventListener('message', t.step_func(e => {
+        if (e.source != w)
+          return;
+
+        assert_header_equals(e.data, {
+          "site": "same-site",
+          "user": "?1",
+          "mode": "navigate",
+          "dest": "document"
+        }, "Same-site window, user-activated");
+        t.done();
+      }));
+    });
+    document.body.appendChild(b);
+    test_driver.click(b);
+  }, "Same-site window, user-activated");
+
+  async_test(t => {
+    let b = document.createElement('button');
+    b.onclick = t.step_func(_ => {
+      let w = window.open("https://{{hosts[alt][www]}}:{{ports[https][0]}}/fetch/metadata/resources/post-to-owner.py");
+      t.add_cleanup(_ => w.close());
+      window.addEventListener('message', t.step_func(e => {
+        if (e.source != w)
+          return;
+
+        assert_header_equals(e.data, {
+          "site": "cross-site",
+          "user": "?1",
+          "mode": "navigate",
+          "dest": "document"
+        }, "Cross-site window, user-activated");
+        t.done();
+      }));
+    });
+    document.body.appendChild(b);
+    test_driver.click(b);
+  }, "Cross-site window, user-activated");
+</script>
diff --git a/test/wpt/tests/fetch/metadata/worker.https.sub.html b/test/wpt/tests/fetch/metadata/worker.https.sub.html
new file mode 100644
index 00000000000..20a4fe54166
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/worker.https.sub.html
@@ -0,0 +1,24 @@
+<!DOCTYPE html>
+
+<link rel="author" href="mtrzos@google.com" title="Maciek Trzos">
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=/fetch/metadata/resources/helper.js></script>
+<script src=/common/utils.js></script>
+<script>
+  let nonce = token();
+
+  promise_test(t => {
+    return new Promise((resolve, reject) => {
+      let key = "worker-same-origin" + nonce;
+      let w = new Worker("/fetch/metadata/resources/record-header.py?file=" + key);
+      w.onmessage = e => {
+        let expected = {"site":"same-origin", "user":"", "mode": "same-origin", "dest": "worker"};
+        validate_expectations(key, expected)
+          .then(_ => resolve())
+          .catch(e => reject(e));
+      };
+    });
+  }, "Same-Origin worker");
+</script>
+<body></body>
diff --git a/test/wpt/tests/fetch/metadata/xslt.https.sub.html b/test/wpt/tests/fetch/metadata/xslt.https.sub.html
new file mode 100644
index 00000000000..dc72d7b8a67
--- /dev/null
+++ b/test/wpt/tests/fetch/metadata/xslt.https.sub.html
@@ -0,0 +1,25 @@
+<!DOCTYPE html>
+
+<link rel="author" href="mtrzos@google.com" title="Maciek Trzos">
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=/fetch/metadata/resources/helper.js></script>
+<script src=/common/utils.js></script>
+<script>
+  // Open a window with XML document which loads resources via <?xml-stylesheet/> tag
+  let nonce = token();
+  let w = window.open("resources/xslt-test.sub.xml?token=" + nonce);
+  window.addEventListener('message', function(e) {
+    if (e.source != w)
+      return;
+
+    // Only testing same-origin XSLT because same-site and cross-site XSLT is blocked.
+    promise_test(t => {
+      let expected = {"site":"same-origin", "user":"", "mode": "same-origin", "dest": "xslt"};
+      return validate_expectations("xslt-same-origin" + nonce, expected);
+    }, "Same-Origin xslt");
+
+    w.close();
+  });
+
+</script>
diff --git a/test/wpt/tests/fetch/nosniff/image.html b/test/wpt/tests/fetch/nosniff/image.html
new file mode 100644
index 00000000000..9dfdb94cf62
--- /dev/null
+++ b/test/wpt/tests/fetch/nosniff/image.html
@@ -0,0 +1,39 @@
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<div id=log></div>
+<script>
+  // Note: images get always sniffed, nosniff doesn't do anything
+  // (but note the tentative Cross-Origin Read Blocking (CORB) tests
+  // - for example wpt/fetch/corb/img-mime-types-coverage.tentative.sub.html).
+  var passes = [
+      // Empty or non-sensical MIME types
+      null, "", "x", "x/x",
+
+      // Image MIME types
+      "image/gif", "image/png", "image/png;blah", "image/svg+xml",
+
+      // CORB-protected MIME types (but note that CORB doesn't apply here,
+      // because CORB ignores same-origin requests).
+      "text/html", "application/xml", "application/blah+xml"
+  ]
+
+  const get_url = (mime) => {
+    let url = "resources/image.py"
+    if (mime != null) {
+        url += "?type=" + encodeURIComponent(mime)
+    }
+    return url
+  }
+
+  passes.forEach(function(mime) {
+    async_test(function(t) {
+      var img = document.createElement("img")
+      img.onerror = t.unreached_func("Unexpected error event")
+      img.onload = t.step_func_done(function(){
+        assert_equals(img.width, 96)
+      })
+      img.src = get_url(mime)
+      document.body.appendChild(img)
+    }, "URL query: " + mime)
+  })
+</script>
diff --git a/test/wpt/tests/fetch/nosniff/importscripts.html b/test/wpt/tests/fetch/nosniff/importscripts.html
new file mode 100644
index 00000000000..920b6bdd409
--- /dev/null
+++ b/test/wpt/tests/fetch/nosniff/importscripts.html
@@ -0,0 +1,14 @@
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<div id=log></div>
+<script>
+ async_test(function(t) {
+   var w = new Worker("importscripts.js")
+   w.onmessage = t.step_func(function(e) {
+     if(e.data == "END")
+       t.done()
+     else
+       assert_equals(e.data, "PASS")
+   })
+ }, "Test importScripts()")
+</script>
diff --git a/test/wpt/tests/fetch/nosniff/importscripts.js b/test/wpt/tests/fetch/nosniff/importscripts.js
new file mode 100644
index 00000000000..18952805bb7
--- /dev/null
+++ b/test/wpt/tests/fetch/nosniff/importscripts.js
@@ -0,0 +1,28 @@
+// Testing importScripts()
+function log(w) { this.postMessage(w) }
+function f() { log("FAIL") }
+function p() { log("PASS") }
+
+const get_url = (mime, outcome) => {
+  let url = "resources/js.py"
+  if (mime != null) {
+      url += "?type=" + encodeURIComponent(mime)
+  }
+  if (outcome) {
+    url += "&outcome=p"
+  }
+  return url
+}
+
+[null, "", "x", "x/x", "text/html", "text/json"].forEach(function(mime) {
+  try {
+    importScripts(get_url(mime))
+  } catch(e) {
+    (e.name == "NetworkError") ? p() : log("FAIL (no NetworkError exception): " + mime)
+  }
+
+})
+importScripts(get_url("text/javascript", true))
+importScripts(get_url("text/ecmascript", true))
+importScripts(get_url("text/ecmascript;blah", true))
+log("END")
diff --git a/test/wpt/tests/fetch/nosniff/parsing-nosniff.window.js b/test/wpt/tests/fetch/nosniff/parsing-nosniff.window.js
new file mode 100644
index 00000000000..2a2648653ca
--- /dev/null
+++ b/test/wpt/tests/fetch/nosniff/parsing-nosniff.window.js
@@ -0,0 +1,27 @@
+promise_test(() => fetch("resources/x-content-type-options.json").then(res => res.json()).then(runTests), "Loading JSON…");
+
+function runTests(allTestData) {
+  for (let i = 0; i < allTestData.length; i++) {
+    const testData = allTestData[i],
+          input = encodeURIComponent(testData.input);
+    promise_test(t => {
+      let resolve;
+      const promise = new Promise(r => resolve = r);
+      const script = document.createElement("script");
+      t.add_cleanup(() => script.remove());
+      // A <script> element loading a classic script does not care about the MIME type, unless
+      // X-Content-Type-Options: nosniff is specified, in which case a JavaScript MIME type is
+      // enforced, which x/x is not.
+      if (testData.nosniff) {
+        script.onerror = resolve;
+        script.onload = t.unreached_func("Script should not have loaded");
+      } else {
+        script.onerror = t.unreached_func("Script should have loaded");
+        script.onload = resolve;
+      }
+      script.src = "resources/nosniff.py?nosniff=" + input;
+      document.body.appendChild(script);
+      return promise;
+    }, input);
+  }
+}
diff --git a/test/wpt/tests/fetch/nosniff/resources/css.py b/test/wpt/tests/fetch/nosniff/resources/css.py
new file mode 100644
index 00000000000..8afb56991d7
--- /dev/null
+++ b/test/wpt/tests/fetch/nosniff/resources/css.py
@@ -0,0 +1,23 @@
+def main(request, response):
+    type = request.GET.first(b"type", None)
+    is_revalidation = request.headers.get(b"If-Modified-Since", None)
+
+    content = b"/* nothing to see here */"
+
+    response.add_required_headers = False
+    if is_revalidation is not None:
+        response.writer.write_status(304)
+        response.writer.write_header(b"x-content-type-options", b"nosniff")
+        response.writer.write_header(b"content-length", 0)
+        if(type != None):
+            response.writer.write_header(b"content-type", type)
+        response.writer.end_headers()
+        response.writer.write(b"")
+    else:
+        response.writer.write_status(200)
+        response.writer.write_header(b"x-content-type-options", b"nosniff")
+        response.writer.write_header(b"content-length", len(content))
+        if(type != None):
+            response.writer.write_header(b"content-type", type)
+        response.writer.end_headers()
+        response.writer.write(content)
diff --git a/test/wpt/tests/fetch/nosniff/resources/image.py b/test/wpt/tests/fetch/nosniff/resources/image.py
new file mode 100644
index 00000000000..9fd367c85c5
--- /dev/null
+++ b/test/wpt/tests/fetch/nosniff/resources/image.py
@@ -0,0 +1,24 @@
+import os.path
+
+from wptserve.utils import isomorphic_decode
+
+def main(request, response):
+    type = request.GET.first(b"type", None)
+
+    if type != None and b"svg" in type:
+        filename = u"green-96x96.svg"
+    else:
+        filename = u"blue96x96.png"
+
+    path = os.path.join(os.path.dirname(isomorphic_decode(__file__)), u"../../../images", filename)
+    body = open(path, u"rb").read()
+
+    response.add_required_headers = False
+    response.writer.write_status(200)
+    response.writer.write_header(b"x-content-type-options", b"nosniff")
+    response.writer.write_header(b"content-length", len(body))
+    if(type != None):
+        response.writer.write_header(b"content-type", type)
+    response.writer.end_headers()
+
+    response.writer.write(body)
diff --git a/test/wpt/tests/fetch/nosniff/resources/js.py b/test/wpt/tests/fetch/nosniff/resources/js.py
new file mode 100644
index 00000000000..784050a2caf
--- /dev/null
+++ b/test/wpt/tests/fetch/nosniff/resources/js.py
@@ -0,0 +1,17 @@
+def main(request, response):
+    outcome = request.GET.first(b"outcome", b"f")
+    type = request.GET.first(b"type", b"Content-Type missing")
+
+    content = b"// nothing to see here"
+    content += b"\n"
+    content += b"log('FAIL: " + type + b"')" if (outcome == b"f") else b"p()"
+
+    response.add_required_headers = False
+    response.writer.write_status(200)
+    response.writer.write_header(b"x-content-type-options", b"nosniff")
+    response.writer.write_header(b"content-length", len(content))
+    if(type != b"Content-Type missing"):
+        response.writer.write_header(b"content-type", type)
+    response.writer.end_headers()
+
+    response.writer.write(content)
diff --git a/test/wpt/tests/fetch/nosniff/resources/nosniff.py b/test/wpt/tests/fetch/nosniff/resources/nosniff.py
new file mode 100644
index 00000000000..159ecfbebd9
--- /dev/null
+++ b/test/wpt/tests/fetch/nosniff/resources/nosniff.py
@@ -0,0 +1,11 @@
+def main(request, response):
+    response.add_required_headers = False
+    output =  b"HTTP/1.1 220 YOU HAVE NO POWER HERE\r\n"
+    output += b"Content-Length: 22\r\n"
+    output += b"Connection: close\r\n"
+    output += b"Content-Type: x/x\r\n"
+    output += request.GET.first(b"nosniff") + b"\r\n"
+    output += b"\r\n"
+    output += b"// nothing to see here"
+    response.writer.write(output)
+    response.close_connection = True
diff --git a/test/wpt/tests/fetch/nosniff/resources/worker.py b/test/wpt/tests/fetch/nosniff/resources/worker.py
new file mode 100644
index 00000000000..2d7e3f6c905
--- /dev/null
+++ b/test/wpt/tests/fetch/nosniff/resources/worker.py
@@ -0,0 +1,16 @@
+def main(request, response):
+    type = request.GET.first(b"type", None)
+
+    content = b"// nothing to see here"
+    content += b"\n"
+    content += b"this.postMessage('hi')"
+
+    response.add_required_headers = False
+    response.writer.write_status(200)
+    response.writer.write_header(b"x-content-type-options", b"nosniff")
+    response.writer.write_header(b"content-length", len(content))
+    if(type != None):
+        response.writer.write_header(b"content-type", type)
+    response.writer.end_headers()
+
+    response.writer.write(content)
diff --git a/test/wpt/tests/fetch/nosniff/resources/x-content-type-options.json b/test/wpt/tests/fetch/nosniff/resources/x-content-type-options.json
new file mode 100644
index 00000000000..080fc1990bf
--- /dev/null
+++ b/test/wpt/tests/fetch/nosniff/resources/x-content-type-options.json
@@ -0,0 +1,62 @@
+[
+  {
+    "input": "X-Content-Type-Options: NOSNIFF",
+    "nosniff": true
+  },
+  {
+    "input": "x-content-type-OPTIONS: nosniff",
+    "nosniff": true
+  },
+  {
+    "input": "X-Content-Type-Options: nosniff,,@#$#%%&^&^*()()11!",
+    "nosniff": true
+  },
+  {
+    "input": "X-Content-Type-Options: @#$#%%&^&^*()()11!,nosniff",
+    "nosniff": false
+  },
+  {
+    "input": "X-Content-Type-Options: nosniff\r\nX-Content-Type-Options: no",
+    "nosniff": true
+  },
+  {
+    "input": "X-Content-Type-Options: no\r\nX-Content-Type-Options: nosniff",
+    "nosniff": false
+  },
+  {
+    "input": "X-Content-Type-Options:\r\nX-Content-Type-Options: nosniff",
+    "nosniff": false
+  },
+  {
+    "input": "X-Content-Type-Options: nosniff\r\nX-Content-Type-Options: nosniff",
+    "nosniff": true
+  },
+  {
+    "input": "X-Content-Type-Options: ,nosniff",
+    "nosniff": false
+  },
+  {
+    "input": "X-Content-Type-Options: nosniff\u000C",
+    "nosniff": false
+  },
+  {
+    "input": "X-Content-Type-Options: nosniff\u000B",
+    "nosniff": false
+  },
+  {
+    "input": "X-Content-Type-Options: nosniff\u000B,nosniff",
+    "nosniff": false
+  },
+  {
+    "input": "X-Content-Type-Options: 'NosniFF'",
+    "nosniff": false
+  },
+  {
+    "input": "X-Content-Type-Options: \"nosniFF\"",
+    "nosniff": false
+  },
+  {
+    "input": "Content-Type-Options: nosniff",
+    "nosniff": false
+  }
+]
diff --git a/test/wpt/tests/fetch/nosniff/script.html b/test/wpt/tests/fetch/nosniff/script.html
new file mode 100644
index 00000000000..e0b5dac7099
--- /dev/null
+++ b/test/wpt/tests/fetch/nosniff/script.html
@@ -0,0 +1,43 @@
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<div id=log></div>
+<script>
+  var log = function() {}, // see comment below
+      p = function() {}, // see comment below
+      fails = [null, "", "x", "x/x", "text/html", "text/json"],
+      passes = ["text/javascript", "text/ecmascript", "text/ecmascript;blah", "text/javascript1.0"]
+
+  // Ideally we'd also check whether the scripts in fact execute, but that would involve
+  // timers and might get a bit racy without cross-browser support for the execute events.
+
+  const get_url = (mime, outcome) => {
+    let url = "resources/js.py"
+    if (mime != null) {
+        url += "?type=" + encodeURIComponent(mime)
+    }
+    if (outcome) {
+      url += "&outcome=p"
+    }
+    return url
+  }
+
+  fails.forEach(function(mime) {
+    async_test(function(t) {
+      var script = document.createElement("script")
+      script.onerror = t.step_func_done(function(){})
+      script.onload = t.unreached_func("Unexpected load event")
+      script.src = get_url(mime)
+      document.body.appendChild(script)
+    }, "URL query: " + mime)
+  })
+
+  passes.forEach(function(mime) {
+    async_test(function(t) {
+      var script = document.createElement("script")
+      script.onerror = t.unreached_func("Unexpected error event")
+      script.onload = t.step_func_done(function(){})
+      script.src = get_url(mime, true)
+      document.body.appendChild(script)
+    }, "URL query: " + mime)
+  })
+</script>
diff --git a/test/wpt/tests/fetch/nosniff/stylesheet.html b/test/wpt/tests/fetch/nosniff/stylesheet.html
new file mode 100644
index 00000000000..8f2b5476e90
--- /dev/null
+++ b/test/wpt/tests/fetch/nosniff/stylesheet.html
@@ -0,0 +1,60 @@
+<!-- quirks mode is important, text/css is already required otherwise -->
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<div id=log></div>
+<script>
+  var fails = [null, "", "x", "x/x", "text/html", "text/json"],
+      passes = ["text/css", "text/css;charset=utf-8", "text/css;blah"]
+
+  const get_url = (mime) => {
+    let url = "resources/css.py"
+    if (mime != null) {
+        url += "?type=" + encodeURIComponent(mime)
+    }
+    return url
+  }
+
+  fails.forEach(function(mime) {
+    async_test(function(t) {
+      var link = document.createElement("link")
+      link.rel = "stylesheet"
+      link.onerror = t.step_func_done()
+      link.onload = t.unreached_func("Unexpected load event")
+      link.href = get_url(mime)
+      document.body.appendChild(link)
+    }, "URL query: " + mime)
+  })
+
+  fails.forEach(function(mime) {
+    async_test(function(t) {
+      var link = document.createElement("link")
+      link.rel = "stylesheet"
+      link.onerror = t.step_func_done()
+      link.onload = t.unreached_func("Unexpected load event")
+      link.href = get_url(mime)
+      document.body.appendChild(link)
+    }, "Revalidated URL query: " + mime)
+  })
+
+  passes.forEach(function(mime) {
+    async_test(function(t) {
+      var link = document.createElement("link")
+      link.rel = "stylesheet"
+      link.onerror = t.unreached_func("Unexpected error event")
+      link.onload = t.step_func_done()
+      link.href = get_url(mime)
+      document.body.appendChild(link)
+    }, "URL query: " + mime)
+  })
+
+  passes.forEach(function(mime) {
+    async_test(function(t) {
+      var link = document.createElement("link")
+      link.rel = "stylesheet"
+      link.onerror = t.unreached_func("Unexpected error event")
+      link.onload = t.step_func_done()
+      link.href = get_url(mime)
+      document.body.appendChild(link)
+    }, "Revalidated URL query: " + mime)
+  })
+</script>
diff --git a/test/wpt/tests/fetch/nosniff/worker.html b/test/wpt/tests/fetch/nosniff/worker.html
new file mode 100644
index 00000000000..c8c1076df5c
--- /dev/null
+++ b/test/wpt/tests/fetch/nosniff/worker.html
@@ -0,0 +1,28 @@
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<div id=log></div>
+<script>
+  var workers = [],
+      fails = ["", "?type=", "?type=x", "?type=x/x", "?type=text/html", "?type=text/json"],
+      passes = ["?type=text/javascript", "?type=text/ecmascript", "?type=text/ecmascript;yay"]
+
+  fails.forEach(function(urlpart) {
+    async_test(function(t) {
+      var w = new Worker("resources/worker.py" + urlpart)
+      w.onmessage = t.unreached_func("Unexpected message event")
+      w.onerror = t.step_func_done(function(){})
+      workers.push(w) // avoid GC
+    }, "URL query: " + urlpart)
+  })
+
+  passes.forEach(function(urlpart) {
+    async_test(function(t) {
+      var w = new Worker("resources/worker.py" + urlpart)
+      w.onmessage = t.step_func_done(function(e){
+        assert_equals(e.data, "hi")
+      })
+      w.onerror = t.unreached_func("Unexpected error event")
+      workers.push(w) // avoid GC
+    }, "URL query: " + urlpart)
+  })
+</script>
diff --git a/test/wpt/tests/fetch/orb/resources/data.json b/test/wpt/tests/fetch/orb/resources/data.json
new file mode 100644
index 00000000000..f2a886f39de
--- /dev/null
+++ b/test/wpt/tests/fetch/orb/resources/data.json
@@ -0,0 +1,3 @@
+{
+  "hello": "world"
+}
diff --git a/test/wpt/tests/fetch/orb/resources/empty.json b/test/wpt/tests/fetch/orb/resources/empty.json
new file mode 100644
index 00000000000..0967ef424bc
--- /dev/null
+++ b/test/wpt/tests/fetch/orb/resources/empty.json
@@ -0,0 +1 @@
+{}
diff --git a/test/wpt/tests/fetch/orb/resources/font.ttf b/test/wpt/tests/fetch/orb/resources/font.ttf
new file mode 100644
index 00000000000..9023592ef5a
Binary files /dev/null and b/test/wpt/tests/fetch/orb/resources/font.ttf differ
diff --git a/test/wpt/tests/fetch/orb/resources/image.png b/test/wpt/tests/fetch/orb/resources/image.png
new file mode 100644
index 00000000000..820f8cace21
Binary files /dev/null and b/test/wpt/tests/fetch/orb/resources/image.png differ
diff --git a/test/wpt/tests/fetch/orb/resources/js-unlabeled.js b/test/wpt/tests/fetch/orb/resources/js-unlabeled.js
new file mode 100644
index 00000000000..a880a5bc724
--- /dev/null
+++ b/test/wpt/tests/fetch/orb/resources/js-unlabeled.js
@@ -0,0 +1 @@
+window.has_executed_script = true;
diff --git a/test/wpt/tests/fetch/orb/resources/png-mislabeled-as-html.png b/test/wpt/tests/fetch/orb/resources/png-mislabeled-as-html.png
new file mode 100644
index 00000000000..820f8cace21
Binary files /dev/null and b/test/wpt/tests/fetch/orb/resources/png-mislabeled-as-html.png differ
diff --git a/test/wpt/tests/fetch/orb/resources/png-mislabeled-as-html.png.headers b/test/wpt/tests/fetch/orb/resources/png-mislabeled-as-html.png.headers
new file mode 100644
index 00000000000..156209f9c81
--- /dev/null
+++ b/test/wpt/tests/fetch/orb/resources/png-mislabeled-as-html.png.headers
@@ -0,0 +1 @@
+Content-Type: text/html
diff --git a/test/wpt/tests/fetch/orb/resources/png-unlabeled.png b/test/wpt/tests/fetch/orb/resources/png-unlabeled.png
new file mode 100644
index 00000000000..820f8cace21
Binary files /dev/null and b/test/wpt/tests/fetch/orb/resources/png-unlabeled.png differ
diff --git a/test/wpt/tests/fetch/orb/resources/script.js b/test/wpt/tests/fetch/orb/resources/script.js
new file mode 100644
index 00000000000..19675d25d83
--- /dev/null
+++ b/test/wpt/tests/fetch/orb/resources/script.js
@@ -0,0 +1,4 @@
+"use strict";
+function fn() {
+  return 42;
+}
diff --git a/test/wpt/tests/fetch/orb/resources/sound.mp3 b/test/wpt/tests/fetch/orb/resources/sound.mp3
new file mode 100644
index 00000000000..a15d1de328f
Binary files /dev/null and b/test/wpt/tests/fetch/orb/resources/sound.mp3 differ
diff --git a/test/wpt/tests/fetch/orb/resources/text.txt b/test/wpt/tests/fetch/orb/resources/text.txt
new file mode 100644
index 00000000000..270c611ee72
--- /dev/null
+++ b/test/wpt/tests/fetch/orb/resources/text.txt
@@ -0,0 +1 @@
+hello, world!
diff --git a/test/wpt/tests/fetch/orb/resources/utils.js b/test/wpt/tests/fetch/orb/resources/utils.js
new file mode 100644
index 00000000000..94a2177f079
--- /dev/null
+++ b/test/wpt/tests/fetch/orb/resources/utils.js
@@ -0,0 +1,18 @@
+function header(name, value) {
+  return `header(${name},${value})`;
+}
+
+function contentType(type) {
+  return header("Content-Type", type);
+}
+
+function contentTypeOptions(type) {
+  return header("X-Content-Type-Options", type);
+}
+
+function fetchORB(file, options, ...pipe) {
+  return fetch(`${file}${pipe.length ? `?pipe=${pipe.join("|")}` : ""}`, {
+    ...(options || {}),
+    mode: "no-cors",
+  });
+}
diff --git a/test/wpt/tests/fetch/orb/tentative/compressed-image-sniffing.sub.html b/test/wpt/tests/fetch/orb/tentative/compressed-image-sniffing.sub.html
new file mode 100644
index 00000000000..38e70c69ad6
--- /dev/null
+++ b/test/wpt/tests/fetch/orb/tentative/compressed-image-sniffing.sub.html
@@ -0,0 +1,20 @@
+<!-- Test verifies that compressed images should not be blocked
+-->
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<div id=log></div>
+<script>
+async_test(function(t) {
+  let url = "http://{{domains[www1]}}:{{ports[http][0]}}"
+  url = url + "/fetch/orb/resources/png-unlabeled.png?pipe=gzip"
+
+  const img = document.createElement("img");
+  img.src = url;
+  img.onerror = t.unreached_func("Unexpected error event")
+  img.onload = t.step_func_done(function () {
+    assert_true(true);
+  })
+  document.body.appendChild(img)
+}, "ORB shouldn't block compressed images");
+</script>
+
diff --git a/test/wpt/tests/fetch/orb/tentative/content-range.sub.any.js b/test/wpt/tests/fetch/orb/tentative/content-range.sub.any.js
new file mode 100644
index 00000000000..ee97521a55c
--- /dev/null
+++ b/test/wpt/tests/fetch/orb/tentative/content-range.sub.any.js
@@ -0,0 +1,31 @@
+// META: script=/fetch/orb/resources/utils.js
+
+const url =
+  "http://{{domains[www1]}}:{{ports[http][0]}}/fetch/orb/resources/image.png";
+
+promise_test(async () => {
+  let headers = new Headers([["Range", "bytes=0-99"]]);
+  await fetchORB(
+    url,
+    { headers },
+    header("Content-Range", "bytes 0-99/1010"),
+    "slice(null,100)",
+    "status(206)"
+  );
+}, "ORB shouldn't block opaque range of image/png starting at zero");
+
+promise_test(
+  t =>
+    promise_rejects_js(
+      t,
+      TypeError,
+      fetchORB(
+        url,
+        { headers: new Headers([["Range", "bytes 10-99"]]) },
+        header("Content-Range", "bytes 10-99/1010"),
+        "slice(10,100)",
+        "status(206)"
+      )
+    ),
+  "ORB should block opaque range of image/png not starting at zero, that isn't subsequent"
+);
diff --git a/test/wpt/tests/fetch/orb/tentative/img-mime-types-coverage.tentative.sub.html b/test/wpt/tests/fetch/orb/tentative/img-mime-types-coverage.tentative.sub.html
new file mode 100644
index 00000000000..5dc6c5d63af
--- /dev/null
+++ b/test/wpt/tests/fetch/orb/tentative/img-mime-types-coverage.tentative.sub.html
@@ -0,0 +1,126 @@
+<!-- Test verifies that cross-origin, nosniff images are 1) blocked when their
+  MIME type is covered by ORB and 2) allowed otherwise.
+
+  This test is very similar to fetch/orb/img-mime-types-coverage.tentative.sub.html,
+  except that it focuses on MIME types relevant to ORB.
+-->
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<div id=log></div>
+<script>
+  var passes = [
+    // ORB safelisted MIME-types - i.e. ones covered by:
+    // - https://github.com/annevk/orb
+
+    "text/css",
+    "image/svg+xml",
+
+    // JavaScript MIME types
+    "application/ecmascript",
+    "application/javascript",
+    "application/x-ecmascript",
+    "application/x-javascript",
+    "text/ecmascript",
+    "text/javascript",
+    "text/javascript1.0",
+    "text/javascript1.1",
+    "text/javascript1.2",
+    "text/javascript1.3",
+    "text/javascript1.4",
+    "text/javascript1.5",
+    "text/jscript",
+    "text/livescript",
+    "text/x-ecmascript",
+    "text/x-javascript",
+  ]
+
+  var fails = [
+    // ORB blocklisted MIME-types - i.e. ones covered by:
+    // - https://github.com/annevk/orb
+
+    "text/html",
+
+    // JSON MIME type
+    "application/json",
+    "text/json",
+    "application/ld+json",
+
+    // XML MIME type
+    "text/xml",
+    "application/xml",
+    "application/xhtml+xml",
+
+    "application/dash+xml",
+    "application/gzip",
+    "application/msexcel",
+    "application/mspowerpoint",
+    "application/msword",
+    "application/msword-template",
+    "application/pdf",
+    "application/vnd.apple.mpegurl",
+    "application/vnd.ces-quickpoint",
+    "application/vnd.ces-quicksheet",
+    "application/vnd.ces-quickword",
+    "application/vnd.ms-excel",
+    "application/vnd.ms-excel.sheet.macroenabled.12",
+    "application/vnd.ms-powerpoint",
+    "application/vnd.ms-powerpoint.presentation.macroenabled.12",
+    "application/vnd.ms-word",
+    "application/vnd.ms-word.document.12",
+    "application/vnd.ms-word.document.macroenabled.12",
+    "application/vnd.msword",
+    "application/vnd.openxmlformats-officedocument.presentationml.presentation",
+    "application/vnd.openxmlformats-officedocument.presentationml.template",
+    "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet",
+    "application/vnd.openxmlformats-officedocument.spreadsheetml.template",
+    "application/vnd.openxmlformats-officedocument.wordprocessingml.document",
+    "application/vnd.openxmlformats-officedocument.wordprocessingml.template",
+    "application/vnd.presentation-openxml",
+    "application/vnd.presentation-openxmlm",
+    "application/vnd.spreadsheet-openxml",
+    "application/vnd.wordprocessing-openxml",
+    "application/x-gzip",
+    "application/x-protobuf",
+    "application/x-protobuffer",
+    "application/zip",
+    "audio/mpegurl",
+    "multipart/byteranges",
+    "multipart/signed",
+    "text/event-stream",
+    "text/csv",
+    "text/vtt",
+]
+
+  const get_url = (mime) => {
+    // www1 is cross-origin, so the HTTP response is ORB-eligible -->
+    url = "http://{{domains[www1]}}:{{ports[http][0]}}"
+    url = url + "/fetch/nosniff/resources/image.py"
+    if (mime != null) {
+      url += "?type=" + encodeURIComponent(mime)
+    }
+    return url
+  }
+
+  passes.forEach(function (mime) {
+    async_test(function (t) {
+      var img = document.createElement("img")
+      img.onerror = t.unreached_func("Unexpected error event")
+      img.onload = t.step_func_done(function () {
+        assert_equals(img.width, 96)
+      })
+      img.src = get_url(mime)
+      document.body.appendChild(img)
+    }, "ORB should allow the response if Content-Type is: '" + mime + "'.  ")
+  })
+
+  fails.forEach(function (mime) {
+    async_test(function (t) {
+      var img = document.createElement("img")
+      img.onerror = t.step_func_done()
+      img.onload = t.unreached_func("Unexpected load event")
+      img.src = get_url(mime)
+      document.body.appendChild(img)
+    }, "ORB should block the response if Content-Type is: '" + mime + "'.  ")
+  })
+</script>
+
diff --git a/test/wpt/tests/fetch/orb/tentative/img-png-mislabeled-as-html.sub-ref.html b/test/wpt/tests/fetch/orb/tentative/img-png-mislabeled-as-html.sub-ref.html
new file mode 100644
index 00000000000..66462fb5e3c
--- /dev/null
+++ b/test/wpt/tests/fetch/orb/tentative/img-png-mislabeled-as-html.sub-ref.html
@@ -0,0 +1,5 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<!-- Same-origin, so the HTTP response is not ORB-eligible. -->
+<img src="../resources/png-mislabeled-as-html.png">
+
diff --git a/test/wpt/tests/fetch/orb/tentative/img-png-mislabeled-as-html.sub.html b/test/wpt/tests/fetch/orb/tentative/img-png-mislabeled-as-html.sub.html
new file mode 100644
index 00000000000..aa03f4db636
--- /dev/null
+++ b/test/wpt/tests/fetch/orb/tentative/img-png-mislabeled-as-html.sub.html
@@ -0,0 +1,7 @@
+<!DOCTYPE html>
+<!-- Test verifies that ORB allows an mislabeled cross-origin image after sniffing. -->
+<meta charset="utf-8">
+<!-- Reference page uses same-origin resources, which are not ORB-eligible. -->
+<link rel="match" href="img-png-mislabeled-as-html.sub-ref.html">
+<!-- www1 is cross-origin, so the HTTP response is ORB-eligible -->
+<img src="http://{{domains[www1]}}:{{ports[http][0]}}/fetch/orb/resources/png-mislabeled-as-html.png">
diff --git a/test/wpt/tests/fetch/orb/tentative/img-png-unlabeled.sub-ref.html b/test/wpt/tests/fetch/orb/tentative/img-png-unlabeled.sub-ref.html
new file mode 100644
index 00000000000..2d5e3bb8b58
--- /dev/null
+++ b/test/wpt/tests/fetch/orb/tentative/img-png-unlabeled.sub-ref.html
@@ -0,0 +1,5 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<!-- Same-origin, so the HTTP response is not ORB-eligible. -->
+<img src="../resources/png-unlabeled.png">
+
diff --git a/test/wpt/tests/fetch/orb/tentative/img-png-unlabeled.sub.html b/test/wpt/tests/fetch/orb/tentative/img-png-unlabeled.sub.html
new file mode 100644
index 00000000000..77415f6af1d
--- /dev/null
+++ b/test/wpt/tests/fetch/orb/tentative/img-png-unlabeled.sub.html
@@ -0,0 +1,7 @@
+<!DOCTYPE html>
+<!-- Test verifies that ORB allows an unlabeled cross-origin image after sniffing. -->
+<meta charset="utf-8">
+<!-- Reference page uses same-origin resources, which are not ORB-eligible. -->
+<link rel="match" href="img-png-unlabeled.sub-ref.html">
+<!-- www1 is cross-origin, so the HTTP response is ORB-eligible -->
+<img src="http://{{domains[www1]}}:{{ports[http][0]}}/fetch/orb/resources/png-unlabeled.png">
diff --git a/test/wpt/tests/fetch/orb/tentative/known-mime-type.sub.any.js b/test/wpt/tests/fetch/orb/tentative/known-mime-type.sub.any.js
new file mode 100644
index 00000000000..d0954c83555
--- /dev/null
+++ b/test/wpt/tests/fetch/orb/tentative/known-mime-type.sub.any.js
@@ -0,0 +1,51 @@
+// META: script=/fetch/orb/resources/utils.js
+
+const path = "http://{{domains[www1]}}:{{ports[http][0]}}/fetch/orb/resources";
+
+promise_test(
+  t =>
+    promise_rejects_js(
+      t,
+      TypeError,
+      fetchORB(`${path}/font.ttf`, null, contentType("font/ttf"))
+    ),
+  "ORB should block opaque font/ttf"
+);
+
+promise_test(
+  t =>
+    promise_rejects_js(
+      t,
+      TypeError,
+      fetchORB(`${path}/text.txt`, null, contentType("text/plain"))
+    ),
+  "ORB should block opaque text/plain"
+);
+
+promise_test(
+  t =>
+    promise_rejects_js(
+      t,
+      TypeError,
+      fetchORB(`${path}/data.json`, null, contentType("application/json"))
+    ),
+  "ORB should block opaque application/json (non-empty)"
+);
+
+promise_test(
+  t =>
+    promise_rejects_js(
+      t,
+      TypeError,
+      fetchORB(`${path}/empty.json`, null, contentType("application/json"))
+    ),
+  "ORB should block opaque application/json (empty)"
+);
+
+promise_test(async () => {
+  fetchORB(`${path}/image.png`, null, contentType("image/png"));
+}, "ORB shouldn't block opaque image/png");
+
+promise_test(async () => {
+  await fetchORB(`${path}/script.js`, null, contentType("text/javascript"));
+}, "ORB shouldn't block opaque text/javascript");
diff --git a/test/wpt/tests/fetch/orb/tentative/nosniff.sub.any.js b/test/wpt/tests/fetch/orb/tentative/nosniff.sub.any.js
new file mode 100644
index 00000000000..3df9d22e0b7
--- /dev/null
+++ b/test/wpt/tests/fetch/orb/tentative/nosniff.sub.any.js
@@ -0,0 +1,59 @@
+// META: script=/fetch/orb/resources/utils.js
+
+const path = "http://{{domains[www1]}}:{{ports[http][0]}}/fetch/orb/resources";
+
+promise_test(
+  t =>
+    promise_rejects_js(
+      t,
+      TypeError,
+      fetchORB(
+        `${path}/text.txt`,
+        null,
+        contentType("text/plain"),
+        contentTypeOptions("nosniff")
+      )
+    ),
+  "ORB should block opaque text/plain with nosniff"
+);
+
+promise_test(
+  t =>
+    promise_rejects_js(
+      t,
+      TypeError,
+      fetchORB(
+        `${path}/data.json`,
+        null,
+        contentType("application/json"),
+        contentTypeOptions("nosniff")
+      )
+    ),
+  "ORB should block opaque-response-blocklisted MIME type with nosniff"
+);
+
+promise_test(
+  t =>
+    promise_rejects_js(
+      t,
+      TypeError,
+      fetchORB(
+        `${path}/data.json`,
+        null,
+        contentType(""),
+        contentTypeOptions("nosniff")
+      )
+    ),
+  "ORB should block opaque response with empty Content-Type and nosniff"
+);
+
+promise_test(
+  () =>
+    fetchORB(
+      `${path}/image.png`,
+      null,
+      contentType(""),
+      contentTypeOptions("nosniff")
+    ),
+  "ORB shouldn't block opaque image with empty Content-Type and nosniff"
+);
diff --git a/test/wpt/tests/fetch/orb/tentative/script-js-unlabeled-gziped.sub.html b/test/wpt/tests/fetch/orb/tentative/script-js-unlabeled-gziped.sub.html
new file mode 100644
index 00000000000..fe854407988
--- /dev/null
+++ b/test/wpt/tests/fetch/orb/tentative/script-js-unlabeled-gziped.sub.html
@@ -0,0 +1,24 @@
+<!DOCTYPE html>
+<!-- Test verifies that gziped script which parses as Javascript (not JSON) without Content-Type will execute with ORB. -->
+<meta charset="utf-8">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<div id=log></div>
+
+<script>
+setup({ single_test: true });
+window.has_executed_script = false;
+</script>
+
+<!-- www1 is cross-origin, so the HTTP response is CORB-eligible -->
+<script src="http://{{domains[www1]}}:{{ports[http][0]}}/fetch/orb/resources/js-unlabeled.js?pipe=gzip|header(Content-Type,)">
+</script>
+
+<script>
+// Verify what observable effects the <script> tag above had.
+// Assertion should hold with and without ORB:
+assert_true(window.has_executed_script,
+            'The cross-origin script should execute');
+done();
+</script>
+
diff --git a/test/wpt/tests/fetch/orb/tentative/script-unlabeled.sub.html b/test/wpt/tests/fetch/orb/tentative/script-unlabeled.sub.html
new file mode 100644
index 00000000000..4987f1307e7
--- /dev/null
+++ b/test/wpt/tests/fetch/orb/tentative/script-unlabeled.sub.html
@@ -0,0 +1,24 @@
+<!DOCTYPE html>
+<!-- Test verifies that script which parses as Javascript (not JSON) without Content-Type will execute with ORB. -->
+<meta charset="utf-8">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<div id=log></div>
+
+<script>
+setup({ single_test: true });
+window.has_executed_script = false;
+</script>
+
+<!-- www1 is cross-origin, so the HTTP response is CORB-eligible -->
+<script src="http://{{domains[www1]}}:{{ports[http][0]}}/fetch/orb/resources/js-unlabeled.js">
+</script>
+
+<script>
+// Verify what observable effects the <script> tag above had.
+// Assertion should hold with and without ORB:
+assert_true(window.has_executed_script,
+            'The cross-origin script should execute');
+done();
+</script>
+
diff --git a/test/wpt/tests/fetch/orb/tentative/status.sub.any.js b/test/wpt/tests/fetch/orb/tentative/status.sub.any.js
new file mode 100644
index 00000000000..b94d8b7f635
--- /dev/null
+++ b/test/wpt/tests/fetch/orb/tentative/status.sub.any.js
@@ -0,0 +1,33 @@
+// META: script=/fetch/orb/resources/utils.js
+
+const path = "http://{{domains[www1]}}:{{ports[http][0]}}/fetch/orb/resources";
+
+promise_test(
+  t =>
+    promise_rejects_js(
+      t,
+      TypeError,
+      fetchORB(
+        `${path}/data.json`,
+        null,
+        contentType("application/json"),
+        "status(206)"
+      )
+    ),
+  "ORB should block opaque-response-blocklisted MIME type with status 206"
+);
+
+promise_test(
+  t =>
+    promise_rejects_js(
+      t,
+      TypeError,
+      fetchORB(
+        `${path}/data.json`,
+        null,
+        contentType("application/json"),
+        "status(302)"
+      )
+    ),
+  "ORB should block opaque response with non-ok status"
+);
diff --git a/test/wpt/tests/fetch/orb/tentative/status.sub.html b/test/wpt/tests/fetch/orb/tentative/status.sub.html
new file mode 100644
index 00000000000..a62bdeb35e4
--- /dev/null
+++ b/test/wpt/tests/fetch/orb/tentative/status.sub.html
@@ -0,0 +1,17 @@
+'use strict';
+
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<div id=log></div>
+<script>
+async_test(function(t) {
+  let url = "http://{{domains[www1]}}:{{ports[http][0]}}"
+  url = `${url}/fetch/orb/resources/sound.mp3?pipe=status(301)|header(Content-Type,)`
+
+  const video = document.createElement("video");
+  video.src = url;
+  video.onerror = t.step_func_done();
+  video.onload = t.unreached_func("Unexpected error event");
+  document.body.appendChild(video);
+}, "ORB should block initial media requests with status not 200 or 206");
+</script>
diff --git a/test/wpt/tests/fetch/orb/tentative/unknown-mime-type.sub.any.js b/test/wpt/tests/fetch/orb/tentative/unknown-mime-type.sub.any.js
new file mode 100644
index 00000000000..f72ff928adb
--- /dev/null
+++ b/test/wpt/tests/fetch/orb/tentative/unknown-mime-type.sub.any.js
@@ -0,0 +1,28 @@
+// META: script=/fetch/orb/resources/utils.js
+
+const path = "http://{{domains[www1]}}:{{ports[http][0]}}/fetch/orb/resources";
+
+promise_test(
+  () => fetchORB(`${path}/font.ttf`, null, contentType("")),
+  "ORB shouldn't block opaque failed missing MIME type (font/ttf)"
+);
+
+promise_test(
+  () => fetchORB(`${path}/text.txt`, null, contentType("")),
+  "ORB shouldn't block opaque failed missing MIME type (text/plain)"
+);
+
+promise_test(
+  t => fetchORB(`${path}/data.json`, null, contentType("")),
+  "ORB shouldn't block opaque failed missing MIME type (application/json)"
+);
+
+promise_test(
+  () => fetchORB(`${path}/image.png`, null, contentType("")),
+  "ORB shouldn't block opaque failed missing MIME type (image/png)"
+);
+
+promise_test(
+  () => fetchORB(`${path}/script.js`, null, contentType("")),
+  "ORB shouldn't block opaque failed missing MIME type (text/javascript)"
+);
diff --git a/test/wpt/tests/fetch/origin/assorted.window.js b/test/wpt/tests/fetch/origin/assorted.window.js
new file mode 100644
index 00000000000..033d010f35a
--- /dev/null
+++ b/test/wpt/tests/fetch/origin/assorted.window.js
@@ -0,0 +1,211 @@
+// META: script=/common/utils.js
+// META: script=/common/get-host-info.sub.js
+
+const origins = get_host_info();
+
+promise_test(async function () {
+  const stash = token(),
+        redirectPath = "/fetch/origin/resources/redirect-and-stash.py";
+
+  // Cross-origin -> same-origin will result in setting the tainted origin flag for the second
+  // request.
+  let url = origins.HTTP_ORIGIN + redirectPath + "?stash=" + stash;
+  url = origins.HTTP_REMOTE_ORIGIN + redirectPath + "?stash=" + stash + "&location=" + encodeURIComponent(url) + "&dummyJS";
+
+  await fetch(url, { mode: "no-cors", method: "POST" });
+
+  const json = await (await fetch(redirectPath + "?dump&stash=" + stash)).json();
+
+  assert_equals(json[0], origins.HTTP_ORIGIN);
+  assert_equals(json[1], "null");
+}, "Origin header and 308 redirect");
+
+promise_test(async function () {
+  const stash = token(),
+        redirectPath = "/fetch/origin/resources/redirect-and-stash.py";
+
+  let url = origins.HTTP_ORIGIN + redirectPath + "?stash=" + stash;
+  url = origins.HTTP_REMOTE_ORIGIN + redirectPath + "?stash=" + stash + "&location=" + encodeURIComponent(url);
+
+  await new Promise(resolve => {
+    const frame = document.createElement("iframe");
+    frame.src = url;
+    frame.onload = () => {
+      resolve();
+      frame.remove();
+    }
+    document.body.appendChild(frame);
+  });
+
+  const json = await (await fetch(redirectPath + "?dump&stash=" + stash)).json();
+
+  assert_equals(json[0], "no Origin header");
+  assert_equals(json[1], "no Origin header");
+}, "Origin header and GET navigation");
+
+promise_test(async function () {
+  const stash = token(),
+        redirectPath = "/fetch/origin/resources/redirect-and-stash.py";
+
+  let url = origins.HTTP_ORIGIN + redirectPath + "?stash=" + stash;
+  url = origins.HTTP_REMOTE_ORIGIN + redirectPath + "?stash=" + stash + "&location=" + encodeURIComponent(url);
+
+  await new Promise(resolve => {
+    const frame = document.createElement("iframe");
+    self.addEventListener("message", e => {
+      if (e.data === "loaded") {
+        resolve();
+        frame.remove();
+      }
+    }, { once: true });
+    frame.onload = () => {
+      const doc = frame.contentDocument,
+            form = doc.body.appendChild(doc.createElement("form")),
+            submit = form.appendChild(doc.createElement("input"));
+      form.action = url;
+      form.method = "POST";
+      submit.type = "submit";
+      submit.click();
+    }
+    document.body.appendChild(frame);
+  });
+
+  const json = await (await fetch(redirectPath + "?dump&stash=" + stash)).json();
+
+  assert_equals(json[0], origins.HTTP_ORIGIN);
+  assert_equals(json[1], "null");
+}, "Origin header and POST navigation");
+
+function navigationReferrerPolicy(referrerPolicy, destination, expectedOrigin) {
+  return async function () {
+    const stash = token();
+    const referrerPolicyPath = "/fetch/origin/resources/referrer-policy.py";
+    const redirectPath = "/fetch/origin/resources/redirect-and-stash.py";
+
+    let postUrl =
+            (destination === "same-origin" ? origins.HTTP_ORIGIN
+                                           : origins.HTTP_REMOTE_ORIGIN) +
+            redirectPath + "?stash=" + stash;
+
+    await new Promise(resolve => {
+      const frame = document.createElement("iframe");
+      document.body.appendChild(frame);
+      frame.src = origins.HTTP_ORIGIN + referrerPolicyPath +
+                  "?referrerPolicy=" + referrerPolicy;
+      self.addEventListener("message", function listener(e) {
+        if (e.data === "loaded") {
+          resolve();
+          frame.remove();
+          self.removeEventListener("message", listener);
+        } else if (e.data === "action") {
+          const doc = frame.contentDocument,
+                form = doc.body.appendChild(doc.createElement("form")),
+                submit = form.appendChild(doc.createElement("input"));
+          form.action = postUrl;
+          form.method = "POST";
+          submit.type = "submit";
+          submit.click();
+        }
+      });
+    });
+
+    const json = await (await fetch(redirectPath + "?dump&stash=" + stash)).json();
+
+    assert_equals(json[0], expectedOrigin);
+  };
+}
+
+function fetchReferrerPolicy(referrerPolicy, destination, fetchMode, expectedOrigin, httpMethod) {
+  return async function () {
+    const stash = token();
+    const redirectPath = "/fetch/origin/resources/redirect-and-stash.py";
+
+    let fetchUrl =
+        (destination === "same-origin" ? origins.HTTP_ORIGIN
+                                       : origins.HTTP_REMOTE_ORIGIN) +
+        redirectPath + "?stash=" + stash + "&dummyJS";
+
+    await fetch(fetchUrl, { mode: fetchMode, method: httpMethod , "referrerPolicy": referrerPolicy});
+
+    const json = await (await fetch(redirectPath + "?dump&stash=" + stash)).json();
+
+    assert_equals(json[0], expectedOrigin);
+  };
+}
+
+function referrerPolicyTestString(referrerPolicy, method, destination) {
+  return "Origin header and " + method + " " + destination + " with Referrer-Policy " +
+         referrerPolicy;
+}
+
+[
+  {
+    "policy": "no-referrer",
+    "expectedOriginForSameOrigin": "null",
+    "expectedOriginForCrossOrigin": "null"
+  },
+  {
+    "policy": "same-origin",
+    "expectedOriginForSameOrigin": origins.HTTP_ORIGIN,
+    "expectedOriginForCrossOrigin": "null"
+  },
+  {
+    "policy": "origin-when-cross-origin",
+    "expectedOriginForSameOrigin": origins.HTTP_ORIGIN,
+    "expectedOriginForCrossOrigin": origins.HTTP_ORIGIN
+  },
+  {
+    "policy": "no-referrer-when-downgrade",
+    "expectedOriginForSameOrigin": origins.HTTP_ORIGIN,
+    "expectedOriginForCrossOrigin": origins.HTTP_ORIGIN
+  },
+  {
+    "policy": "unsafe-url",
+    "expectedOriginForSameOrigin": origins.HTTP_ORIGIN,
+    "expectedOriginForCrossOrigin": origins.HTTP_ORIGIN
+  },
+].forEach(testObj => {
+  [
+    {
+      "name": "same-origin",
+      "expectedOrigin": testObj.expectedOriginForSameOrigin
+    },
+    {
+      "name": "cross-origin",
+      "expectedOrigin": testObj.expectedOriginForCrossOrigin
+    }
+  ].forEach(destination => {
+    // Test form POST navigation
+    promise_test(navigationReferrerPolicy(testObj.policy,
+                                          destination.name,
+                                          destination.expectedOrigin),
+                 referrerPolicyTestString(testObj.policy, "POST",
+                                          destination.name + " navigation"));
+    // Test fetch
+    promise_test(fetchReferrerPolicy(testObj.policy,
+                                     destination.name,
+                                     "no-cors",
+                                     destination.expectedOrigin,
+                                     "POST"),
+                 referrerPolicyTestString(testObj.policy, "POST",
+                                          destination.name + " fetch no-cors mode"));
+
+    // Test cors mode POST
+    promise_test(fetchReferrerPolicy(testObj.policy,
+                                     destination.name,
+                                     "cors",
+                                     origins.HTTP_ORIGIN,
+                                     "POST"),
+                 referrerPolicyTestString(testObj.policy, "POST",
+                                          destination.name + " fetch cors mode"));
+
+    // Test cors mode GET
+    promise_test(fetchReferrerPolicy(testObj.policy,
+                                     destination.name,
+                                     "cors",
+                                     (destination.name == "same-origin") ? "no Origin header" : origins.HTTP_ORIGIN,
+                                     "GET"),
+                 referrerPolicyTestString(testObj.policy, "GET",
+                                          destination.name + " fetch cors mode"));
+  });
+});
diff --git a/test/wpt/tests/fetch/origin/resources/redirect-and-stash.py b/test/wpt/tests/fetch/origin/resources/redirect-and-stash.py
new file mode 100644
index 00000000000..36c584c08cc
--- /dev/null
+++ b/test/wpt/tests/fetch/origin/resources/redirect-and-stash.py
@@ -0,0 +1,38 @@
+import json
+
+from wptserve.utils import isomorphic_decode
+
+def main(request, response):
+    key = request.GET.first(b"stash")
+    origin = request.headers.get(b"origin")
+    if origin is None:
+        origin = b"no Origin header"
+
+    origin_list = request.server.stash.take(key)
+
+    if b"dump" in request.GET:
+        response.headers.set(b"Content-Type", b"application/json")
+        response.content = json.dumps(origin_list)
+        return
+
+    if origin_list is None:
+        origin_list = [isomorphic_decode(origin)]
+    else:
+        origin_list.append(isomorphic_decode(origin))
+
+    request.server.stash.put(key, origin_list)
+
+    if b"location" in request.GET:
+        location = request.GET.first(b"location")
+        if b"dummyJS" in request.GET:
+            location += b"&dummyJS"
+        response.status = 308
+        response.headers.set(b"Location", location)
+        return
+
+    response.headers.set(b"Content-Type", b"text/html")
+    response.headers.set(b"Access-Control-Allow-Origin", b"*")
+    if b"dummyJS" in request.GET:
+        response.content = b"console.log('dummy JS')"
+    else:
+        response.content = b"<meta charset=utf-8>\n<body><script>parent.postMessage('loaded','*')</script></body>"
diff --git a/test/wpt/tests/fetch/origin/resources/referrer-policy.py b/test/wpt/tests/fetch/origin/resources/referrer-policy.py
new file mode 100644
index 00000000000..15716e068b9
--- /dev/null
+++ b/test/wpt/tests/fetch/origin/resources/referrer-policy.py
@@ -0,0 +1,7 @@
+def main(request, response):
+    if b"referrerPolicy" in request.GET:
+        response.headers.set(b"Referrer-Policy",
+                             request.GET.first(b"referrerPolicy"))
+    response.status = 200
+    response.headers.set(b"Content-Type", b"text/html")
+    response.content = b"<meta charset=utf-8>\n<body><script>parent.postMessage('action','*')</script></body>"
diff --git a/test/wpt/tests/fetch/private-network-access/META.yml b/test/wpt/tests/fetch/private-network-access/META.yml
new file mode 100644
index 00000000000..944ce6f14a1
--- /dev/null
+++ b/test/wpt/tests/fetch/private-network-access/META.yml
@@ -0,0 +1,7 @@
+spec: https://wicg.github.io/private-network-access/
+suggested_reviewers:
+  - letitz
+  - lyf
+  - hemeryar
+  - camillelamy
+  - mikewest
diff --git a/test/wpt/tests/fetch/private-network-access/README.md b/test/wpt/tests/fetch/private-network-access/README.md
new file mode 100644
index 00000000000..a69aab48723
--- /dev/null
+++ b/test/wpt/tests/fetch/private-network-access/README.md
@@ -0,0 +1,10 @@
+# Private Network Access tests
+
+This directory contains tests for Private Network Access' integration with
+the Fetch specification.
+
+See also:
+
+* [The specification](https://wicg.github.io/private-network-access/)
+* [The repository](https://github.com/WICG/private-network-access/)
+* [Open issues](https://github.com/WICG/private-network-access/issues/)
diff --git a/test/wpt/tests/fetch/private-network-access/fetch-from-treat-as-public.https.window.js b/test/wpt/tests/fetch/private-network-access/fetch-from-treat-as-public.https.window.js
new file mode 100644
index 00000000000..90f7feb6341
--- /dev/null
+++ b/test/wpt/tests/fetch/private-network-access/fetch-from-treat-as-public.https.window.js
@@ -0,0 +1,68 @@
+// META: script=/common/utils.js
+// META: script=resources/support.sub.js
+//
+// Spec: https://wicg.github.io/private-network-access/#integration-fetch
+//
+// These tests verify that documents fetched from the `local` or `private`
+// address space yet carrying the `treat-as-public-address` CSP directive are
+// treated as if they had been fetched from the `public` address space.
+
+promise_test(t => fetchTest(t, {
+  source: {
+    server: Server.HTTPS_LOCAL,
+    treatAsPublic: true,
+  },
+  target: { server: Server.HTTPS_LOCAL },
+  expected: FetchTestResult.FAILURE,
+}), "treat-as-public-address to local: failed preflight.");
+
+promise_test(t => fetchTest(t, {
+  source: {
+    server: Server.HTTPS_LOCAL,
+    treatAsPublic: true,
+  },
+  target: {
+    server: Server.HTTPS_LOCAL,
+    behavior: {
+      preflight: PreflightBehavior.optionalSuccess(token()),
+      // Interesting: no need for CORS headers on same-origin final response.
+    },
+  },
+  expected: FetchTestResult.SUCCESS,
+}), "treat-as-public-address to local: success.");
+
+promise_test(t => fetchTest(t, {
+  source: {
+    server: Server.HTTPS_LOCAL,
+    treatAsPublic: true,
+  },
+  target: { server: Server.HTTPS_PRIVATE },
+  expected: FetchTestResult.FAILURE,
+}), "treat-as-public-address to private: failed preflight.");
+
+promise_test(t => fetchTest(t, {
+  source: {
+    server: Server.HTTPS_LOCAL,
+    treatAsPublic: true,
+  },
+  target: {
+    server: Server.HTTPS_PRIVATE,
+    behavior: {
+      preflight: PreflightBehavior.optionalSuccess(token()),
+      response: ResponseBehavior.allowCrossOrigin(),
+    },
+  },
+  expected: FetchTestResult.SUCCESS,
+}), "treat-as-public-address to private: success.");
+
+promise_test(t => fetchTest(t, {
+  source: {
+    server: Server.HTTPS_LOCAL,
+    treatAsPublic: true,
+  },
+  target: {
+    server: Server.HTTPS_PUBLIC,
+    behavior: { response: ResponseBehavior.allowCrossOrigin() },
+  },
+  expected: FetchTestResult.SUCCESS,
+}), "treat-as-public-address to public: no preflight required.");
diff --git a/test/wpt/tests/fetch/private-network-access/fetch.https.window.js b/test/wpt/tests/fetch/private-network-access/fetch.https.window.js
new file mode 100644
index 00000000000..dbc4f23f677
--- /dev/null
+++ b/test/wpt/tests/fetch/private-network-access/fetch.https.window.js
@@ -0,0 +1,271 @@
+// META: script=/common/subset-tests-by-key.js
+// META: script=/common/utils.js
+// META: script=resources/support.sub.js
+// META: variant=?include=baseline
+// META: variant=?include=from-local
+// META: variant=?include=from-private
+// META: variant=?include=from-public
+//
+// Spec: https://wicg.github.io/private-network-access/#integration-fetch
+//
+// These tests verify that secure contexts can fetch subresources from all
+// address spaces, provided that the target server, if more private than the
+// initiator, respond affirmatively to preflight requests.
+//
+// This file covers only those tests that must execute in a secure context.
+// Other tests are defined in: fetch.window.js
+
+setup(() => {
+  // Making sure we are in a secure context, as expected.
+  assert_true(window.isSecureContext);
+});
+
+// Source: secure local context.
+//
+// All fetches unaffected by Private Network Access.
+
+subsetTestByKey("from-local", promise_test, t => fetchTest(t, {
+  source: { server: Server.HTTPS_LOCAL },
+  target: { server: Server.HTTPS_LOCAL },
+  expected: FetchTestResult.SUCCESS,
+}), "local to local: no preflight required.");
+
+subsetTestByKey("from-local", promise_test, t => fetchTest(t, {
+  source: { server: Server.HTTPS_LOCAL },
+  target: {
+    server: Server.HTTPS_PRIVATE,
+    behavior: { response: ResponseBehavior.allowCrossOrigin() },
+  },
+  expected: FetchTestResult.SUCCESS,
+}), "local to private: no preflight required.");
+
+
+subsetTestByKey("from-local", promise_test, t => fetchTest(t, {
+  source: { server: Server.HTTPS_LOCAL },
+  target: {
+    server: Server.HTTPS_PUBLIC,
+    behavior: { response: ResponseBehavior.allowCrossOrigin() },
+  },
+  expected: FetchTestResult.SUCCESS,
+}), "local to public: no preflight required.");
+
+// Strictly speaking, the following two tests do not exercise PNA-specific
+// logic, but they serve as a baseline for comparison, ensuring that non-PNA
+// preflight requests are sent and handled as expected.
+
+subsetTestByKey("baseline", promise_test, t => fetchTest(t, {
+  source: { server: Server.HTTPS_LOCAL },
+  target: {
+    server: Server.HTTPS_PUBLIC,
+    behavior: {
+      preflight: PreflightBehavior.failure(),
+      response: ResponseBehavior.allowCrossOrigin(),
+    },
+  },
+  fetchOptions: { method: "PUT" },
+  expected: FetchTestResult.FAILURE,
+}), "local to public: PUT preflight failure.");
+
+subsetTestByKey("baseline", promise_test, t => fetchTest(t, {
+  source: { server: Server.HTTPS_LOCAL },
+  target: {
+    server: Server.HTTPS_PUBLIC,
+    behavior: {
+      preflight: PreflightBehavior.success(token()),
+      response: ResponseBehavior.allowCrossOrigin(),
+    }
+  },
+  fetchOptions: { method: "PUT" },
+  expected: FetchTestResult.SUCCESS,
+}), "local to public: PUT preflight success.");
+
+// Generates tests of preflight behavior for a single (source, target) pair.
+//
+// Scenarios:
+//
+//  - cors mode:
+//    - preflight response has non-2xx HTTP code
+//    - preflight response is missing CORS headers
+//    - preflight response is missing the PNA-specific `Access-Control` header
+//    - final response is missing CORS headers
+//    - success
+//    - success with PUT method (non-"simple" request)
+//  - no-cors mode:
+//    - preflight response has non-2xx HTTP code
+//    - preflight response is missing CORS headers
+//    - preflight response is missing the PNA-specific `Access-Control` header
+//    - success
+//
+function makePreflightTests({
+  subsetKey,
+  source,
+  sourceDescription,
+  targetServer,
+  targetDescription,
+}) {
+  const prefix =
+      `${sourceDescription} to ${targetDescription}: `;
+
+  subsetTestByKey(subsetKey, promise_test, t => fetchTest(t, {
+    source,
+    target: {
+      server: targetServer,
+      behavior: {
+        preflight: PreflightBehavior.failure(),
+        response: ResponseBehavior.allowCrossOrigin(),
+      },
+    },
+    expected: FetchTestResult.FAILURE,
+  }), prefix + "failed preflight.");
+
+  subsetTestByKey(subsetKey, promise_test, t => fetchTest(t, {
+    source,
+    target: {
+      server: targetServer,
+      behavior: {
+        preflight: PreflightBehavior.noCorsHeader(token()),
+        response: ResponseBehavior.allowCrossOrigin(),
+      },
+    },
+    expected: FetchTestResult.FAILURE,
+  }), prefix + "missing CORS headers on preflight response.");
+
+  subsetTestByKey(subsetKey, promise_test, t => fetchTest(t, {
+    source,
+    target: {
+      server: targetServer,
+      behavior: {
+        preflight: PreflightBehavior.noPnaHeader(token()),
+        response: ResponseBehavior.allowCrossOrigin(),
+      },
+    },
+    expected: FetchTestResult.FAILURE,
+  }), prefix + "missing PNA header on preflight response.");
+
+  subsetTestByKey(subsetKey, promise_test, t => fetchTest(t, {
+    source,
+    target: {
+      server: targetServer,
+      behavior: { preflight: PreflightBehavior.success(token()) },
+    },
+    expected: FetchTestResult.FAILURE,
+  }), prefix + "missing CORS headers on final response.");
+
+  subsetTestByKey(subsetKey, promise_test, t => fetchTest(t, {
+    source,
+    target: {
+      server: targetServer,
+      behavior: {
+        preflight: PreflightBehavior.success(token()),
+        response: ResponseBehavior.allowCrossOrigin(),
+      },
+    },
+    expected: FetchTestResult.SUCCESS,
+  }), prefix + "success.");
+
+  subsetTestByKey(subsetKey, promise_test, t => fetchTest(t, {
+    source,
+    target: {
+      server: targetServer,
+      behavior: {
+        preflight: PreflightBehavior.success(token()),
+        response: ResponseBehavior.allowCrossOrigin(),
+      },
+    },
+    fetchOptions: { method: "PUT" },
+    expected: FetchTestResult.SUCCESS,
+  }), prefix + "PUT success.");
+
+  subsetTestByKey(subsetKey, promise_test, t => fetchTest(t, {
+    source,
+    target: { server: targetServer },
+    fetchOptions: { mode: "no-cors" },
+    expected: FetchTestResult.FAILURE,
+  }), prefix + "no-CORS mode failed preflight.");
+
+  subsetTestByKey(subsetKey, promise_test, t => fetchTest(t, {
+    source,
+    target: {
+      server: targetServer,
+      behavior: { preflight: PreflightBehavior.noCorsHeader(token()) },
+    },
+    fetchOptions: { mode: "no-cors" },
+    expected: FetchTestResult.FAILURE,
+  }), prefix + "no-CORS mode missing CORS headers on preflight response.");
+
+  subsetTestByKey(subsetKey, promise_test, t => fetchTest(t, {
+    source,
+    target: {
+      server: targetServer,
+      behavior: { preflight: PreflightBehavior.noPnaHeader(token()) },
+    },
+    fetchOptions: { mode: "no-cors" },
+    expected: FetchTestResult.FAILURE,
+  }), prefix + "no-CORS mode missing PNA header on preflight response.");
+
+  subsetTestByKey(subsetKey, promise_test, t => fetchTest(t, {
+    source,
+    target: {
+      server: targetServer,
+      behavior: { preflight: PreflightBehavior.success(token()) },
+    },
+    fetchOptions: { mode: "no-cors" },
+    expected: FetchTestResult.OPAQUE,
+  }), prefix + "no-CORS mode success.");
+}
+
+// Source: private secure context.
+//
+// Fetches to the local address space require a successful preflight response
+// carrying a PNA-specific header.
+
+makePreflightTests({
+  subsetKey: "from-private",
+  source: { server: Server.HTTPS_PRIVATE },
+  sourceDescription: "private",
+  targetServer: Server.HTTPS_LOCAL,
+  targetDescription: "local",
+});
+
+subsetTestByKey("from-private", promise_test, t => fetchTest(t, {
+  source: { server: Server.HTTPS_PRIVATE },
+  target: { server: Server.HTTPS_PRIVATE },
+  expected: FetchTestResult.SUCCESS,
+}), "private to private: no preflight required.");
+
+subsetTestByKey("from-private", promise_test, t => fetchTest(t, {
+  source: { server: Server.HTTPS_PRIVATE },
+  target: {
+    server: Server.HTTPS_PRIVATE,
+    behavior: { response: ResponseBehavior.allowCrossOrigin() },
+  },
+  expected: FetchTestResult.SUCCESS,
+}), "private to public: no preflight required.");
+
+// Source: public secure context.
+//
+// Fetches to the local and private address spaces require a successful
+// preflight response carrying a PNA-specific header.
+
+makePreflightTests({
+  subsetKey: "from-public",
+  source: { server: Server.HTTPS_PUBLIC },
+  sourceDescription: "public",
+  targetServer: Server.HTTPS_LOCAL,
+  targetDescription: "local",
+});
+
+makePreflightTests({
+  subsetKey: "from-public",
+  source: { server: Server.HTTPS_PUBLIC },
+  sourceDescription: "public",
+  targetServer: Server.HTTPS_PRIVATE,
+  targetDescription: "private",
+});
+
+subsetTestByKey("from-public", promise_test, t => fetchTest(t, {
+  source: { server: Server.HTTPS_PUBLIC },
+  target: { server: Server.HTTPS_PUBLIC },
+  expected: FetchTestResult.SUCCESS,
+}), "public to public: no preflight required.");
+
diff --git a/test/wpt/tests/fetch/private-network-access/fetch.window.js b/test/wpt/tests/fetch/private-network-access/fetch.window.js
new file mode 100644
index 00000000000..8ee54c90562
--- /dev/null
+++ b/test/wpt/tests/fetch/private-network-access/fetch.window.js
@@ -0,0 +1,183 @@
+// META: script=/common/utils.js
+// META: script=resources/support.sub.js
+//
+// Spec: https://wicg.github.io/private-network-access/#integration-fetch
+//
+// These tests verify that non-secure contexts cannot fetch subresources from
+// less-public address spaces, and can fetch them otherwise.
+//
+// This file covers only those tests that must execute in a non secure context.
+// Other tests are defined in: fetch.https.window.js
+
+setup(() => {
+  // Making sure we are in a non secure context, as expected.
+  assert_false(window.isSecureContext);
+});
+
+promise_test(t => fetchTest(t, {
+  source: { server: Server.HTTP_LOCAL },
+  target: { server: Server.HTTP_LOCAL },
+  expected: FetchTestResult.SUCCESS,
+}), "local to local: no preflight required.");
+
+promise_test(t => fetchTest(t, {
+  source: { server: Server.HTTP_LOCAL },
+  target: {
+    server: Server.HTTP_PRIVATE,
+    behavior: { response: ResponseBehavior.allowCrossOrigin() },
+  },
+  expected: FetchTestResult.SUCCESS,
+}), "local to private: no preflight required.");
+
+promise_test(t => fetchTest(t, {
+  source: { server: Server.HTTP_LOCAL },
+  target: {
+    server: Server.HTTP_PUBLIC,
+    behavior: { response: ResponseBehavior.allowCrossOrigin() },
+  },
+  expected: FetchTestResult.SUCCESS,
+}), "local to public: no preflight required.");
+
+promise_test(t => fetchTest(t, {
+  source: { server: Server.HTTP_PRIVATE },
+  target: {
+    server: Server.HTTP_LOCAL,
+    behavior: {
+      preflight: PreflightBehavior.optionalSuccess(token()),
+      response: ResponseBehavior.allowCrossOrigin(),
+    },
+  },
+  expected: FetchTestResult.FAILURE,
+}), "private to local: failure.");
+
+promise_test(t => fetchTest(t, {
+  source: { server: Server.HTTP_PRIVATE },
+  target: { server: Server.HTTP_PRIVATE },
+  expected: FetchTestResult.SUCCESS,
+}), "private to private: no preflight required.");
+
+promise_test(t => fetchTest(t, {
+  source: { server: Server.HTTP_PRIVATE },
+  target: {
+    server: Server.HTTP_PUBLIC,
+    behavior: { response: ResponseBehavior.allowCrossOrigin() },
+  },
+  expected: FetchTestResult.SUCCESS,
+}), "private to public: no preflight required.");
+
+promise_test(t => fetchTest(t, {
+  source: { server: Server.HTTP_PUBLIC },
+  target: {
+    server: Server.HTTP_LOCAL,
+    behavior: {
+      preflight: PreflightBehavior.optionalSuccess(token()),
+      response: ResponseBehavior.allowCrossOrigin(),
+    },
+  },
+  expected: FetchTestResult.FAILURE,
+}), "public to local: failure.");
+
+promise_test(t => fetchTest(t, {
+  source: { server: Server.HTTP_PUBLIC },
+  target: {
+    server: Server.HTTP_PRIVATE,
+    behavior: {
+      preflight: PreflightBehavior.optionalSuccess(token()),
+      response: ResponseBehavior.allowCrossOrigin(),
+    },
+  },
+  expected: FetchTestResult.FAILURE,
+}), "public to private: failure.");
+
+promise_test(t => fetchTest(t, {
+  source: { server: Server.HTTP_PUBLIC },
+  target: { server: Server.HTTP_PUBLIC },
+  expected: FetchTestResult.SUCCESS,
+}), "public to public: no preflight required.");
+
+// These tests verify that documents fetched from the `local` address space yet
+// carrying the `treat-as-public-address` CSP directive are treated as if they
+// had been fetched from the `public` address space.
+
+promise_test(t => fetchTest(t, {
+  source: {
+    server: Server.HTTP_LOCAL,
+    treatAsPublic: true,
+  },
+  target: {
+    server: Server.HTTP_LOCAL,
+    behavior: {
+      preflight: PreflightBehavior.success(token()),
+      response: ResponseBehavior.allowCrossOrigin(),
+    },
+  },
+  expected: FetchTestResult.FAILURE,
+}), "treat-as-public-address to local: failure.");
+
+promise_test(t => fetchTest(t, {
+  source: {
+    server: Server.HTTP_LOCAL,
+    treatAsPublic: true,
+  },
+  target: {
+    server: Server.HTTP_PRIVATE,
+    behavior: {
+      preflight: PreflightBehavior.success(token()),
+      response: ResponseBehavior.allowCrossOrigin(),
+    },
+  },
+  expected: FetchTestResult.FAILURE,
+}), "treat-as-public-address to private: failure.");
+
+promise_test(t => fetchTest(t, {
+  source: {
+    server: Server.HTTP_LOCAL,
+    treatAsPublic: true,
+  },
+  target: {
+    server: Server.HTTP_PUBLIC,
+    behavior: { response: ResponseBehavior.allowCrossOrigin() },
+  },
+  expected: FetchTestResult.SUCCESS,
+}), "treat-as-public-address to public: no preflight required.");
+
+// These tests verify that HTTPS iframes embedded in an HTTP top-level document
+// cannot fetch subresources from less-public address spaces. Indeed, even
+// though the iframes have HTTPS origins, they are non-secure contexts because
+// their parent is a non-secure context.
+
+promise_test(t => fetchTest(t, {
+  source: { server: Server.HTTPS_PRIVATE },
+  target: {
+    server: Server.HTTPS_LOCAL,
+    behavior: {
+      preflight: PreflightBehavior.success(token()),
+      response: ResponseBehavior.allowCrossOrigin(),
+    },
+  },
+  expected: FetchTestResult.FAILURE,
+}), "private https to local: failure.");
+
+promise_test(t => fetchTest(t, {
+  source: { server: Server.HTTPS_PUBLIC },
+  target: {
+    server: Server.HTTPS_LOCAL,
+    behavior: {
+      preflight: PreflightBehavior.success(token()),
+      response: ResponseBehavior.allowCrossOrigin(),
+    },
+  },
+  expected: FetchTestResult.FAILURE,
+}), "public https to local: failure.");
+
+promise_test(t => fetchTest(t, {
+  source: { server: Server.HTTPS_PUBLIC },
+  target: {
+    server: Server.HTTPS_PRIVATE,
+    behavior: {
+      preflight: PreflightBehavior.success(token()),
+      response: ResponseBehavior.allowCrossOrigin(),
+    },
+  },
+  expected: FetchTestResult.FAILURE,
+}), "public https to private: failure.");
diff --git a/test/wpt/tests/fetch/private-network-access/iframe.tentative.https.window.js b/test/wpt/tests/fetch/private-network-access/iframe.tentative.https.window.js
new file mode 100644
index 00000000000..48bd6420fd9
--- /dev/null
+++ b/test/wpt/tests/fetch/private-network-access/iframe.tentative.https.window.js
@@ -0,0 +1,229 @@
+// META: script=/common/dispatcher/dispatcher.js
+// META: script=/common/utils.js
+// META: script=resources/support.sub.js
+//
+// Spec: https://wicg.github.io/private-network-access/#integration-fetch
+//
+// These tests verify that contexts can navigate iframes to less-public address
+// spaces iff the target server responds affirmatively to preflight requests.
+//
+// This file covers only those tests that must execute in a secure context.
+// Other tests are defined in: iframe.tentative.window.js
+
+setup(() => {
+  assert_true(window.isSecureContext);
+});
+
+// Source: secure local context.
+//
+// All fetches unaffected by Private Network Access.
+
+promise_test_parallel(t => iframeTest(t, {
+  source: { server: Server.HTTPS_LOCAL },
+  target: { server: Server.HTTPS_LOCAL },
+  expected: IframeTestResult.SUCCESS,
+}), "local to local: no preflight required.");
+
+promise_test_parallel(t => iframeTest(t, {
+  source: { server: Server.HTTPS_LOCAL },
+  target: { server: Server.HTTPS_PRIVATE },
+  expected: IframeTestResult.SUCCESS,
+}), "local to private: no preflight required.");
+
+promise_test_parallel(t => iframeTest(t, {
+  source: { server: Server.HTTPS_LOCAL },
+  target: { server: Server.HTTPS_PUBLIC },
+  expected: IframeTestResult.SUCCESS,
+}), "local to public: no preflight required.");
+
+// Generates tests of preflight behavior for a single (source, target) pair.
+//
+// Scenarios:
+//
+// - parent navigates child:
+//   - preflight response has non-2xx HTTP code
+//   - preflight response is missing CORS headers
+//   - preflight response is missing the PNA-specific `Access-Control` header
+//   - success
+//
+function makePreflightTests({
+  sourceName,
+  sourceServer,
+  sourceTreatAsPublic,
+  targetName,
+  targetServer,
+}) {
+  const prefix =
+      `${sourceName} to ${targetName}: `;
+
+  const source = {
+    server: sourceServer,
+    treatAsPublic: sourceTreatAsPublic,
+  };
+
+  promise_test_parallel(t => iframeTest(t, {
+    source,
+    target: {
+      server: targetServer,
+      behavior: { preflight: PreflightBehavior.failure() },
+    },
+    expected: IframeTestResult.FAILURE,
+  }), prefix + "failed preflight.");
+
+  promise_test_parallel(t => iframeTest(t, {
+    source,
+    target: {
+      server: targetServer,
+      behavior: { preflight: PreflightBehavior.noCorsHeader(token()) },
+    },
+    expected: IframeTestResult.FAILURE,
+  }), prefix + "missing CORS headers.");
+
+  promise_test_parallel(t => iframeTest(t, {
+    source,
+    target: {
+      server: targetServer,
+      behavior: { preflight: PreflightBehavior.noPnaHeader(token()) },
+    },
+    expected: IframeTestResult.FAILURE,
+  }), prefix + "missing PNA header.");
+
+  promise_test_parallel(t => iframeTest(t, {
+    source,
+    target: {
+      server: targetServer,
+      behavior: { preflight: PreflightBehavior.success(token()) },
+    },
+    expected: IframeTestResult.SUCCESS,
+  }), prefix + "success.");
+}
+
+// Source: private secure context.
+//
+// Fetches to the local address space require a successful preflight response
+// carrying a PNA-specific header.
+
+makePreflightTests({
+  sourceServer: Server.HTTPS_PRIVATE,
+  sourceName: "private",
+  targetServer: Server.HTTPS_LOCAL,
+  targetName: "local",
+});
+
+promise_test_parallel(t => iframeTest(t, {
+  source: { server: Server.HTTPS_PRIVATE },
+  target: { server: Server.HTTPS_PRIVATE },
+  expected: IframeTestResult.SUCCESS,
+}), "private to private: no preflight required.");
+
+promise_test_parallel(t => iframeTest(t, {
+  source: { server: Server.HTTPS_PRIVATE },
+  target: { server: Server.HTTPS_PUBLIC },
+  expected: IframeTestResult.SUCCESS,
+}), "private to public: no preflight required.");
+
+// Source: public secure context.
+//
+// Fetches to the local and private address spaces require a successful
+// preflight response carrying a PNA-specific header.
+
+makePreflightTests({
+  sourceServer: Server.HTTPS_PUBLIC,
+  sourceName: "public",
+  targetServer: Server.HTTPS_LOCAL,
+  targetName: "local",
+});
+
+makePreflightTests({
+  sourceServer: Server.HTTPS_PUBLIC,
+  sourceName: "public",
+  targetServer: Server.HTTPS_PRIVATE,
+  targetName: "private",
+});
+
+promise_test_parallel(t => iframeTest(t, {
+  source: { server: Server.HTTPS_PUBLIC },
+  target: { server: Server.HTTPS_PUBLIC },
+  expected: IframeTestResult.SUCCESS,
+}), "public to public: no preflight required.");
+
+// The following tests verify that `CSP: treat-as-public-address` makes
+// documents behave as if they had been served from a public IP address.
+
+makePreflightTests({
+  sourceServer: Server.HTTPS_LOCAL,
+  sourceTreatAsPublic: true,
+  sourceName: "treat-as-public-address",
+  targetServer: Server.HTTPS_LOCAL,
+  targetName: "local",
+});
+
+makePreflightTests({
+  sourceServer: Server.HTTPS_LOCAL,
+  sourceTreatAsPublic: true,
+  sourceName: "treat-as-public-address",
+  targetServer: Server.HTTPS_PRIVATE,
+  targetName: "private",
+});
+
+promise_test_parallel(t => iframeTest(t, {
+  source: {
+    server: Server.HTTPS_LOCAL,
+    treatAsPublic: true,
+  },
+  target: { server: Server.HTTPS_PUBLIC },
+  expected: IframeTestResult.SUCCESS,
+}), "treat-as-public-address to public: no preflight required.");
+
+promise_test_parallel(t => iframeTest(t, {
+  source: {
+    server: Server.HTTPS_LOCAL,
+    treatAsPublic: true,
+  },
+  target: {
+    server: Server.HTTPS_PUBLIC,
+    behavior: { preflight: PreflightBehavior.optionalSuccess(token()) }
+  },
+  expected: IframeTestResult.SUCCESS,
+}), "treat-as-public-address to local: optional preflight");
+
+// The following tests verify that when a grandparent frame navigates its
+// grandchild, the IP address space of the grandparent is compared against the
+// IP address space of the response. Indeed, the navigation initiator in this
+// case is the grandparent, not the parent.
+
+iframeGrandparentTest({
+  name: "local to local, grandparent navigates: no preflight required.",
+  grandparentServer: Server.HTTPS_LOCAL,
+  child: { server: Server.HTTPS_PUBLIC },
+  grandchild: { server: Server.HTTPS_LOCAL },
+  expected: IframeTestResult.SUCCESS,
+});
+
+iframeGrandparentTest({
+  name: "public to local, grandparent navigates: failure.",
+  grandparentServer: Server.HTTPS_PUBLIC,
+  child: {
+    server: Server.HTTPS_LOCAL,
+    behavior: { preflight: PreflightBehavior.success(token()) },
+  },
+  grandchild: {
+    server: Server.HTTPS_LOCAL,
+    behavior: { preflight: PreflightBehavior.failure() },
+  },
+  expected: IframeTestResult.FAILURE,
+});
+
+iframeGrandparentTest({
+  name: "public to local, grandparent navigates: success.",
+  grandparentServer: Server.HTTPS_PUBLIC,
+  child: {
+    server: Server.HTTPS_LOCAL,
+    behavior: { preflight: PreflightBehavior.success(token()) },
+  },
+  grandchild: {
+    server: Server.HTTPS_LOCAL,
+    behavior: { preflight: PreflightBehavior.success(token()) },
+  },
+  expected: IframeTestResult.SUCCESS,
+});
diff --git a/test/wpt/tests/fetch/private-network-access/iframe.tentative.window.js b/test/wpt/tests/fetch/private-network-access/iframe.tentative.window.js
new file mode 100644
index 00000000000..e00cb202bec
--- /dev/null
+++ b/test/wpt/tests/fetch/private-network-access/iframe.tentative.window.js
@@ -0,0 +1,110 @@
+// META: script=/common/dispatcher/dispatcher.js
+// META: script=/common/utils.js
+// META: script=resources/support.sub.js
+//
+// Spec: https://wicg.github.io/private-network-access/#integration-fetch
+//
+// These tests verify that non-secure contexts cannot navigate iframes to
+// less-public address spaces, and can navigate them otherwise.
+//
+// This file covers only those tests that must execute in a non secure context.
+// Other tests are defined in: iframe.https.window.js
+
+setup(() => {
+  // Making sure we are in a non secure context, as expected.
+  assert_false(window.isSecureContext);
+});
+
+promise_test_parallel(t => iframeTest(t, {
+  source: { server: Server.HTTP_LOCAL },
+  target: { server: Server.HTTP_LOCAL },
+  expected: IframeTestResult.SUCCESS,
+}), "local to local: no preflight required.");
+
+promise_test_parallel(t => iframeTest(t, {
+  source: { server: Server.HTTP_LOCAL },
+  target: { server: Server.HTTP_PRIVATE },
+  expected: IframeTestResult.SUCCESS,
+}), "local to private: no preflight required.");
+
+promise_test_parallel(t => iframeTest(t, {
+  source: { server: Server.HTTP_LOCAL },
+  target: { server: Server.HTTP_PUBLIC },
+  expected: IframeTestResult.SUCCESS,
+}), "local to public: no preflight required.");
+
+promise_test_parallel(t => iframeTest(t, {
+  source: { server: Server.HTTP_PRIVATE },
+  target: { server: Server.HTTP_LOCAL },
+  expected: IframeTestResult.FAILURE,
+}), "private to local: failure.");
+
+promise_test_parallel(t => iframeTest(t, {
+  source: { server: Server.HTTP_PRIVATE },
+  target: { server: Server.HTTP_PRIVATE },
+  expected: IframeTestResult.SUCCESS,
+}), "private to private: no preflight required.");
+
+promise_test_parallel(t => iframeTest(t, {
+  source: { server: Server.HTTP_PRIVATE },
+  target: { server: Server.HTTP_PUBLIC },
+  expected: IframeTestResult.SUCCESS,
+}), "private to public: no preflight required.");
+
+promise_test_parallel(t => iframeTest(t, {
+  source: { server: Server.HTTP_PUBLIC },
+  target: { server: Server.HTTP_LOCAL },
+  expected: IframeTestResult.FAILURE,
+}), "public to local: failure.");
+
+promise_test_parallel(t => iframeTest(t, {
+  source: { server: Server.HTTP_PUBLIC },
+  target: { server: Server.HTTP_PRIVATE },
+  expected: IframeTestResult.FAILURE,
+}), "public to private: failure.");
+
+promise_test_parallel(t => iframeTest(t, {
+  source: { server: Server.HTTP_PUBLIC },
+  target: { server: Server.HTTP_PUBLIC },
+  expected: IframeTestResult.SUCCESS,
+}), "public to public: no preflight required.");
+
+promise_test_parallel(t => iframeTest(t, {
+  source: {
+    server: Server.HTTP_LOCAL,
+    treatAsPublic: true,
+  },
+  target: { server: Server.HTTP_LOCAL },
+  expected: IframeTestResult.FAILURE,
+}), "treat-as-public-address to local: failure.");
+
+promise_test_parallel(t => iframeTest(t, {
+  source: {
+    server: Server.HTTP_LOCAL,
+    treatAsPublic: true,
+  },
+  target: { server: Server.HTTP_PRIVATE },
+  expected: IframeTestResult.FAILURE,
+}), "treat-as-public-address to private: failure.");
+
+promise_test_parallel(t => iframeTest(t, {
+  source: {
+    server: Server.HTTP_LOCAL,
+    treatAsPublic: true,
+  },
+  target: { server: Server.HTTP_PUBLIC },
+  expected: IframeTestResult.SUCCESS,
+}), "treat-as-public-address to public: no preflight required.");
+
+// The following test verifies that when a grandparent frame navigates its
+// grandchild, the IP address space of the grandparent is compared against the
+// IP address space of the response. Indeed, the navigation initiator in this
+// case is the grandparent, not the parent.
+
+iframeGrandparentTest({
+  name: "local to local, grandparent navigates: success.",
+  grandparentServer: Server.HTTP_LOCAL,
+  child: { server: Server.HTTP_PUBLIC },
+  grandchild: { server: Server.HTTP_LOCAL },
+  expected: IframeTestResult.SUCCESS,
+});
diff --git a/test/wpt/tests/fetch/private-network-access/mixed-content-fetch.tentative.https.window.js b/test/wpt/tests/fetch/private-network-access/mixed-content-fetch.tentative.https.window.js
new file mode 100644
index 00000000000..54485dc7047
--- /dev/null
+++ b/test/wpt/tests/fetch/private-network-access/mixed-content-fetch.tentative.https.window.js
@@ -0,0 +1,277 @@
+// META: script=/common/utils.js
+// META: script=resources/support.sub.js
+//
+// Spec: https://wicg.github.io/private-network-access
+//
+// These tests verify that secure contexts can fetch non-secure subresources
+// from more private address spaces, avoiding mixed context checks, as long as
+// they specify a valid `targetAddressSpace` fetch option that matches the
+// target server's address space.
+
+setup(() => {
+  // Making sure we are in a secure context, as expected.
+  assert_true(window.isSecureContext);
+});
+
+// Given `addressSpace`, returns the other three possible IP address spaces.
+function otherAddressSpaces(addressSpace) {
+  switch (addressSpace) {
+    case "local": return ["unknown", "private", "public"];
+    case "private": return ["unknown", "local", "public"];
+    case "public": return ["unknown", "local", "private"];
+  }
+}
+
+// Generates tests of `targetAddressSpace` for the given (source, target)
+// address space pair, expecting fetches to succeed iff `targetAddressSpace` is
+// correct.
+//
+// Scenarios exercised:
+//
+//  - cors mode:
+//    - missing targetAddressSpace option
+//    - incorrect targetAddressSpace option (x3, see `otherAddressSpaces()`)
+//    - failed preflight
+//    - success
+//    - success with PUT method (non-"simple" request)
+//  - no-cors mode:
+//    - success
+//
+function makeTests({ source, target }) {
+  const sourceServer = Server.get("https", source);
+  const targetServer = Server.get("http", target);
+
+  const makeTest = ({
+    fetchOptions,
+    targetBehavior,
+    name,
+    expected
+  }) => {
+    promise_test_parallel(t => fetchTest(t, {
+      source: { server: sourceServer },
+      target: {
+        server: targetServer,
+        behavior: targetBehavior,
+      },
+      fetchOptions,
+      expected,
+    }), `${sourceServer.name} to ${targetServer.name}: ${name}.`);
+  };
+
+  makeTest({
+    name: "missing targetAddressSpace",
+    targetBehavior: {
+      preflight: PreflightBehavior.success(token()),
+      response: ResponseBehavior.allowCrossOrigin(),
+    },
+    expected: FetchTestResult.FAILURE,
+  });
+
+  const correctAddressSpace = targetServer.addressSpace;
+
+  for (const targetAddressSpace of otherAddressSpaces(correctAddressSpace)) {
+    makeTest({
+      name: `wrong targetAddressSpace "${targetAddressSpace}"`,
+      targetBehavior: {
+        preflight: PreflightBehavior.success(token()),
+        response: ResponseBehavior.allowCrossOrigin(),
+      },
+      fetchOptions: { targetAddressSpace },
+      expected: FetchTestResult.FAILURE,
+    });
+  }
+
+  makeTest({
+    name: "failed preflight",
+    targetBehavior: {
+      preflight: PreflightBehavior.failure(),
+      response: ResponseBehavior.allowCrossOrigin(),
+    },
+    fetchOptions: { targetAddressSpace: correctAddressSpace },
+    expected: FetchTestResult.FAILURE,
+  });
+
+  makeTest({
+    name: "success",
+    targetBehavior: {
+      preflight: PreflightBehavior.success(token()),
+      response: ResponseBehavior.allowCrossOrigin(),
+    },
+    fetchOptions: { targetAddressSpace: correctAddressSpace },
+    expected: FetchTestResult.SUCCESS,
+  });
+
+  makeTest({
+    name: "PUT success",
+    targetBehavior: {
+      preflight: PreflightBehavior.success(token()),
+      response: ResponseBehavior.allowCrossOrigin(),
+    },
+    fetchOptions: {
+      targetAddressSpace: correctAddressSpace,
+      method: "PUT",
+    },
+    expected: FetchTestResult.SUCCESS,
+  });
+
+  makeTest({
+    name: "no-cors success",
+    targetBehavior: {
+      preflight: PreflightBehavior.success(token()),
+      response: ResponseBehavior.allowCrossOrigin(),
+    },
+    fetchOptions: {
+      targetAddressSpace: correctAddressSpace,
+      mode: "no-cors",
+    },
+    expected: FetchTestResult.OPAQUE,
+  });
+}
+
+// Generates tests for the given (source, target) address space pair expecting
+// that `targetAddressSpace` cannot be used to bypass mixed content.
+//
+// Scenarios exercised:
+//
+// - wrong `targetAddressSpace` (x3, see `otherAddressSpaces()`)
+// - correct `targetAddressSpace`
+//
+function makeNoBypassTests({ source, target }) {
+  const sourceServer = Server.get("https", source);
+  const targetServer = Server.get("http", target);
+
+  const prefix = `${sourceServer.name} to ${targetServer.name}: `;
+
+  const correctAddressSpace = targetServer.addressSpace;
+  for (const targetAddressSpace of otherAddressSpaces(correctAddressSpace)) {
+    promise_test_parallel(t => fetchTest(t, {
+      source: { server: sourceServer },
+      target: {
+        server: targetServer,
+        behavior: {
+          preflight: PreflightBehavior.success(token()),
+          response: ResponseBehavior.allowCrossOrigin(),
+        },
+      },
+      fetchOptions: { targetAddressSpace },
+      expected: FetchTestResult.FAILURE,
+    }), prefix + `wrong targetAddressSpace "${targetAddressSpace}".`);
+  }
+
+  promise_test_parallel(t => fetchTest(t, {
+    source: { server: sourceServer },
+    target: {
+      server: targetServer,
+      behavior: {
+        preflight: PreflightBehavior.success(token()),
+        response: ResponseBehavior.allowCrossOrigin(),
+      },
+    },
+    fetchOptions: { targetAddressSpace: correctAddressSpace },
+    expected: FetchTestResult.FAILURE,
+  }), prefix + 'not a private network request.');
+}
+
+// Source: local secure context.
+//
+// Fetches to the local and private address spaces cannot use
+// `targetAddressSpace` to bypass mixed content, as they are not otherwise
+// blocked by Private Network Access.
+
+makeNoBypassTests({ source: "local", target: "local" });
+makeNoBypassTests({ source: "local", target: "private" });
+makeNoBypassTests({ source: "local", target: "public" });
+
+// Source: private secure context.
+//
+// Fetches to the local address space requires the right `targetAddressSpace`
+// option, as well as a successful preflight response carrying a PNA-specific
+// header.
+//
+// Fetches to the private address space cannot use `targetAddressSpace` to
+// bypass mixed content, as they are not otherwise blocked by Private Network
+// Access.
+
+makeTests({ source: "private", target: "local" });
+
+makeNoBypassTests({ source: "private", target: "private" });
+makeNoBypassTests({ source: "private", target: "public" });
+
+// Source: public secure context.
+//
+// Fetches to the local and private address spaces require the right
+// `targetAddressSpace` option, as well as a successful preflight response
+// carrying a PNA-specific header.
+
+makeTests({ source: "public", target: "local" });
+makeTests({ source: "public", target: "private" });
+
+makeNoBypassTests({ source: "public", target: "public" });
+
+// These tests verify that documents fetched from the `local` address space yet
+// carrying the `treat-as-public-address` CSP directive are treated as if they
+// had been fetched from the `public` address space.
+
+promise_test_parallel(t => fetchTest(t, {
+  source: {
+    server: Server.HTTPS_LOCAL,
+    treatAsPublic: true,
+  },
+  target: {
+    server: Server.HTTP_LOCAL,
+    behavior: {
+      preflight: PreflightBehavior.optionalSuccess(token()),
+      response: ResponseBehavior.allowCrossOrigin(),
+    },
+  },
+  fetchOptions: { targetAddressSpace: "private" },
+  expected: FetchTestResult.FAILURE,
+}), 'https-treat-as-public to http-local: wrong targetAddressSpace "private".');
+
+promise_test_parallel(t => fetchTest(t, {
+  source: {
+    server: Server.HTTPS_LOCAL,
+    treatAsPublic: true,
+  },
+  target: {
+    server: Server.HTTP_LOCAL,
+    behavior: {
+      preflight: PreflightBehavior.optionalSuccess(token()),
+      response: ResponseBehavior.allowCrossOrigin(),
+    },
+  },
+  fetchOptions: { targetAddressSpace: "local" },
+  expected: FetchTestResult.SUCCESS,
+}), "https-treat-as-public to http-local: success.");
+
+promise_test_parallel(t => fetchTest(t, {
+  source: {
+    server: Server.HTTPS_LOCAL,
+    treatAsPublic: true,
+  },
+  target: {
+    server: Server.HTTP_PRIVATE,
+    behavior: {
+      preflight: PreflightBehavior.success(token()),
+      response: ResponseBehavior.allowCrossOrigin(),
+    },
+  },
+  fetchOptions: { targetAddressSpace: "local" },
+  expected: FetchTestResult.FAILURE,
+}), 'https-treat-as-public to http-private: wrong targetAddressSpace "local".');
+
+promise_test_parallel(t => fetchTest(t, {
+  source: {
+    server: Server.HTTPS_LOCAL,
+    treatAsPublic: true,
+  },
+  target: {
+    server: Server.HTTP_PRIVATE,
+    behavior: {
+      preflight: PreflightBehavior.success(token()),
+      response: ResponseBehavior.allowCrossOrigin(),
+    },
+  },
+  fetchOptions: { targetAddressSpace: "private" },
+  expected: FetchTestResult.SUCCESS,
+}), "https-treat-as-public to http-private: success.");
diff --git a/test/wpt/tests/fetch/private-network-access/nested-worker.https.window.js b/test/wpt/tests/fetch/private-network-access/nested-worker.https.window.js
new file mode 100644
index 00000000000..3eeb435badb
--- /dev/null
+++ b/test/wpt/tests/fetch/private-network-access/nested-worker.https.window.js
@@ -0,0 +1,36 @@
+// META: script=/common/utils.js
+// META: script=resources/support.sub.js
+//
+// Spec: https://wicg.github.io/private-network-access/#integration-fetch
+//
+// These tests check that initial `Worker` script fetches from within worker
+// scopes are subject to Private Network Access checks, just like a worker
+// script fetches from within document scopes (for non-nested workers). The
+// latter are tested in: worker.https.window.js
+//
+// This file covers only those tests that must execute in a secure context.
+// Other tests are defined in: nested-worker.window.js
+
+promise_test(t => nestedWorkerScriptTest(t, {
+  source: {
+    server: Server.HTTPS_LOCAL,
+    treatAsPublic: true,
+  },
+  target: { server: Server.HTTPS_LOCAL },
+  expected: WorkerScriptTestResult.FAILURE,
+}), "treat-as-public to local: failure.");
+
+promise_test(t => nestedWorkerScriptTest(t, {
+  source: {
+    server: Server.HTTPS_PRIVATE,
+    treatAsPublic: true,
+  },
+  target: { server: Server.HTTPS_PRIVATE },
+  expected: WorkerScriptTestResult.FAILURE,
+}), "treat-as-public to private: failure.");
+
+promise_test(t => nestedWorkerScriptTest(t, {
+  source: { server: Server.HTTPS_PUBLIC },
+  target: { server: Server.HTTPS_PUBLIC },
+  expected: WorkerScriptTestResult.SUCCESS,
+}), "public to public: success.");
diff --git a/test/wpt/tests/fetch/private-network-access/nested-worker.window.js b/test/wpt/tests/fetch/private-network-access/nested-worker.window.js
new file mode 100644
index 00000000000..6d246e1c76d
--- /dev/null
+++ b/test/wpt/tests/fetch/private-network-access/nested-worker.window.js
@@ -0,0 +1,36 @@
+// META: script=/common/utils.js
+// META: script=resources/support.sub.js
+//
+// Spec: https://wicg.github.io/private-network-access/#integration-fetch
+//
+// These tests check that initial `Worker` script fetches from within worker
+// scopes are subject to Private Network Access checks, just like a worker
+// script fetches from within document scopes (for non-nested workers). The
+// latter are tested in: worker.window.js
+//
+// This file covers only those tests that must execute in a non secure context.
+// Other tests are defined in: nested-worker.https.window.js
+
+promise_test(t => nestedWorkerScriptTest(t, {
+  source: {
+    server: Server.HTTP_LOCAL,
+    treatAsPublic: true,
+  },
+  target: { server: Server.HTTP_LOCAL },
+  expected: WorkerScriptTestResult.FAILURE,
+}), "treat-as-public to local: failure.");
+
+promise_test(t => nestedWorkerScriptTest(t, {
+  source: {
+    server: Server.HTTP_PRIVATE,
+    treatAsPublic: true,
+  },
+  target: { server: Server.HTTP_PRIVATE },
+  expected: WorkerScriptTestResult.FAILURE,
+}), "treat-as-public to private: failure.");
+
+promise_test(t => nestedWorkerScriptTest(t, {
+  source: { server: Server.HTTP_PUBLIC },
+  target: { server: Server.HTTP_PUBLIC },
+  expected: WorkerScriptTestResult.SUCCESS,
+}), "public to public: success.");
diff --git a/test/wpt/tests/fetch/private-network-access/preflight-cache.https.window.js b/test/wpt/tests/fetch/private-network-access/preflight-cache.https.window.js
new file mode 100644
index 00000000000..87dbf501f62
--- /dev/null
+++ b/test/wpt/tests/fetch/private-network-access/preflight-cache.https.window.js
@@ -0,0 +1,88 @@
+// META: script=/common/utils.js
+// META: script=resources/support.sub.js
+//
+// Spec: https://wicg.github.io/private-network-access/#cors-preflight
+//
+// These tests verify that PNA preflight responses are cached.
+//
+// TODO(https://crbug.com/1268312): We cannot currently test that cache
+// entries are keyed by target IP address space because that requires
+// loading the same URL from different IP address spaces, and the WPT
+// framework does not allow that.
+promise_test(async t => {
+  let uuid = token();
+  await fetchTest(t, {
+    source: { server: Server.HTTPS_PRIVATE },
+    target: {
+      server: Server.HTTPS_LOCAL,
+      behavior: {
+        preflight: PreflightBehavior.singlePreflight(uuid),
+        response: ResponseBehavior.allowCrossOrigin(),
+      },
+    },
+    expected: FetchTestResult.SUCCESS,
+  });
+  await fetchTest(t, {
+    source: { server: Server.HTTPS_PRIVATE },
+    target: {
+      server: Server.HTTPS_LOCAL,
+      behavior: {
+        preflight: PreflightBehavior.singlePreflight(uuid),
+        response: ResponseBehavior.allowCrossOrigin(),
+      },
+    },
+    expected: FetchTestResult.SUCCESS,
+  });
+}, "private to local: success.");
+
+promise_test(async t => {
+  let uuid = token();
+  await fetchTest(t, {
+    source: { server: Server.HTTPS_PUBLIC },
+    target: {
+      server: Server.HTTPS_LOCAL,
+      behavior: {
+        preflight: PreflightBehavior.singlePreflight(uuid),
+        response: ResponseBehavior.allowCrossOrigin(),
+      },
+    },
+    expected: FetchTestResult.SUCCESS,
+  });
+  await fetchTest(t, {
+    source: { server: Server.HTTPS_PUBLIC },
+    target: {
+      server: Server.HTTPS_LOCAL,
+      behavior: {
+        preflight: PreflightBehavior.singlePreflight(uuid),
+        response: ResponseBehavior.allowCrossOrigin(),
+      },
+    },
+    expected: FetchTestResult.SUCCESS,
+  });
+}, "public to local: success.");
+
+promise_test(async t => {
+  let uuid = token();
+  await fetchTest(t, {
+    source: { server: Server.HTTPS_PUBLIC },
+    target: {
+      server: Server.HTTPS_PRIVATE,
+      behavior: {
+        preflight: PreflightBehavior.singlePreflight(uuid),
+        response: ResponseBehavior.allowCrossOrigin(),
+      },
+    },
+    expected: FetchTestResult.SUCCESS,
+  });
+  await fetchTest(t, {
+    source: { server: Server.HTTPS_PUBLIC },
+    target: {
+      server: Server.HTTPS_PRIVATE,
+      behavior: {
+        preflight: PreflightBehavior.singlePreflight(uuid),
+        response: ResponseBehavior.allowCrossOrigin(),
+      },
+    },
+    expected: FetchTestResult.SUCCESS,
+  });
+}, "public to private: success.");
\ No newline at end of file
diff --git a/test/wpt/tests/fetch/private-network-access/redirect.https.window.js b/test/wpt/tests/fetch/private-network-access/redirect.https.window.js
new file mode 100644
index 00000000000..fe004d929de
--- /dev/null
+++ b/test/wpt/tests/fetch/private-network-access/redirect.https.window.js
@@ -0,0 +1,232 @@
+// META: script=/common/utils.js
+// META: script=resources/support.sub.js
+//
+// Spec: https://wicg.github.io/private-network-access/#integration-fetch
+//
+// This test verifies that Private Network Access checks are applied to all
+// the endpoints in a redirect chain, relative to the same client context.
+
+// local -> private -> public
+//
+// Request 1 (local -> private): no preflight.
+// Request 2 (local -> public): no preflight.
+
+promise_test(t => fetchTest(t, {
+  source: { server: Server.HTTPS_LOCAL },
+  target: {
+    server: Server.HTTPS_PRIVATE,
+    behavior: {
+      response: ResponseBehavior.allowCrossOrigin(),
+      redirect: preflightUrl({
+        server: Server.HTTPS_PUBLIC,
+        behavior: { response: ResponseBehavior.allowCrossOrigin() },
+      }),
+    }
+  },
+  expected: FetchTestResult.SUCCESS,
+}), "local to private to public: success.");
+
+// local -> private -> local
+//
+// Request 1 (local -> private): no preflight.
+// Request 2 (local -> local): no preflight.
+//
+// This checks that the client for the second request is still the initial
+// context, not the redirector.
+
+promise_test(t => fetchTest(t, {
+  source: { server: Server.HTTPS_LOCAL },
+  target: {
+    server: Server.HTTPS_PRIVATE,
+    behavior: {
+      response: ResponseBehavior.allowCrossOrigin(),
+      redirect: preflightUrl({
+        server: Server.HTTPS_LOCAL,
+        behavior: { response: ResponseBehavior.allowCrossOrigin() },
+      }),
+    }
+  },
+  expected: FetchTestResult.SUCCESS,
+}), "local to private to local: success.");
+
+// private -> private -> local
+//
+// Request 1 (private -> private): no preflight.
+// Request 2 (private -> local): preflight required.
+//
+// This verifies that PNA checks are applied after redirects.
+
+promise_test(t => fetchTest(t, {
+  source: { server: Server.HTTPS_PRIVATE },
+  target: {
+    server: Server.HTTPS_PRIVATE,
+    behavior: {
+      redirect: preflightUrl({
+        server: Server.HTTPS_LOCAL,
+        behavior: { response: ResponseBehavior.allowCrossOrigin() },
+      }),
+    }
+  },
+  expected: FetchTestResult.FAILURE,
+}), "private to private to local: failed preflight.");
+
+promise_test(t => fetchTest(t, {
+  source: { server: Server.HTTPS_PRIVATE },
+  target: {
+    server: Server.HTTPS_PRIVATE,
+    behavior: {
+      redirect: preflightUrl({
+        server: Server.HTTPS_LOCAL,
+        behavior: {
+          preflight: PreflightBehavior.success(token()),
+          response: ResponseBehavior.allowCrossOrigin(),
+        },
+      }),
+    }
+  },
+  expected: FetchTestResult.SUCCESS,
+}), "private to private to local: success.");
+
+promise_test(t => fetchTest(t, {
+  source: { server: Server.HTTPS_PRIVATE },
+  target: {
+    server: Server.HTTPS_PRIVATE,
+    behavior: {
+      redirect: preflightUrl({
+        server: Server.HTTPS_LOCAL,
+        behavior: { preflight: PreflightBehavior.success(token()) },
+      }),
+    }
+  },
+  fetchOptions: { mode: "no-cors" },
+  expected: FetchTestResult.OPAQUE,
+}), "private to private to local: no-cors success.");
+
+// private -> local -> private
+//
+// Request 1 (private -> local): preflight required.
+// Request 2 (private -> private): no preflight.
+//
+// This verifies that PNA checks are applied independently to every step in a
+// redirect chain.
+
+promise_test(t => fetchTest(t, {
+  source: { server: Server.HTTPS_PRIVATE },
+  target: {
+    server: Server.HTTPS_LOCAL,
+    behavior: {
+      response: ResponseBehavior.allowCrossOrigin(),
+      redirect: preflightUrl({
+        server: Server.HTTPS_PRIVATE,
+      }),
+    }
+  },
+  expected: FetchTestResult.FAILURE,
+}), "private to local to private: failed preflight.");
+
+promise_test(t => fetchTest(t, {
+  source: { server: Server.HTTPS_PRIVATE },
+  target: {
+    server: Server.HTTPS_LOCAL,
+    behavior: {
+      preflight: PreflightBehavior.success(token()),
+      response: ResponseBehavior.allowCrossOrigin(),
+      redirect: preflightUrl({
+        server: Server.HTTPS_PRIVATE,
+        behavior: { response: ResponseBehavior.allowCrossOrigin() },
+      }),
+    }
+  },
+  expected: FetchTestResult.SUCCESS,
+}), "private to local to private: success.");
+
+promise_test(t => fetchTest(t, {
+  source: { server: Server.HTTPS_PRIVATE },
+  target: {
+    server: Server.HTTPS_LOCAL,
+    behavior: {
+      preflight: PreflightBehavior.success(token()),
+      redirect: preflightUrl({ server: Server.HTTPS_PRIVATE }),
+    }
+  },
+  fetchOptions: { mode: "no-cors" },
+  expected: FetchTestResult.OPAQUE,
+}), "private to local to private: no-cors success.");
+
+// public -> private -> local
+//
+// Request 1 (public -> private): preflight required.
+// Request 2 (public -> local): preflight required.
+//
+// This verifies that PNA checks are applied to every step in a redirect chain.
+
+promise_test(t => fetchTest(t, {
+  source: { server: Server.HTTPS_PUBLIC },
+  target: {
+    server: Server.HTTPS_PRIVATE,
+    behavior: {
+      response: ResponseBehavior.allowCrossOrigin(),
+      redirect: preflightUrl({
+        server: Server.HTTPS_LOCAL,
+        behavior: {
+          preflight: PreflightBehavior.success(token()),
+          response: ResponseBehavior.allowCrossOrigin(),
+        },
+      }),
+    }
+  },
+  expected: FetchTestResult.FAILURE,
+}), "public to private to local: failed first preflight.");
+
+promise_test(t => fetchTest(t, {
+  source: { server: Server.HTTPS_PUBLIC },
+  target: {
+    server: Server.HTTPS_PRIVATE,
+    behavior: {
+      preflight: PreflightBehavior.success(token()),
+      response: ResponseBehavior.allowCrossOrigin(),
+      redirect: preflightUrl({
+        server: Server.HTTPS_LOCAL,
+        behavior: {
+          response: ResponseBehavior.allowCrossOrigin(),
+        },
+      }),
+    }
+  },
+  expected: FetchTestResult.FAILURE,
+}), "public to private to local: failed second preflight.");
+
+promise_test(t => fetchTest(t, {
+  source: { server: Server.HTTPS_PUBLIC },
+  target: {
+    server: Server.HTTPS_PRIVATE,
+    behavior: {
+      preflight: PreflightBehavior.success(token()),
+      response: ResponseBehavior.allowCrossOrigin(),
+      redirect: preflightUrl({
+        server: Server.HTTPS_LOCAL,
+        behavior: {
+          preflight: PreflightBehavior.success(token()),
+          response: ResponseBehavior.allowCrossOrigin(),
+        },
+      }),
+    }
+  },
+  expected: FetchTestResult.SUCCESS,
+}), "public to private to local: success.");
+
+promise_test(t => fetchTest(t, {
+  source: { server: Server.HTTPS_PUBLIC },
+  target: {
+    server: Server.HTTPS_PRIVATE,
+    behavior: {
+      preflight: PreflightBehavior.success(token()),
+      redirect: preflightUrl({
+        server: Server.HTTPS_LOCAL,
+        behavior: { preflight: PreflightBehavior.success(token()) },
+      }),
+    }
+  },
+  fetchOptions: { mode: "no-cors" },
+  expected: FetchTestResult.OPAQUE,
+}), "public to private to local: no-cors success.");
diff --git a/test/wpt/tests/fetch/private-network-access/resources/executor.html b/test/wpt/tests/fetch/private-network-access/resources/executor.html
new file mode 100644
index 00000000000..d71212951cb
--- /dev/null
+++ b/test/wpt/tests/fetch/private-network-access/resources/executor.html
@@ -0,0 +1,9 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Executor</title>
+<body></body>
+<script src="/common/dispatcher/dispatcher.js"></script>
+<script>
+  const uuid = new URL(window.location).searchParams.get("executor-uuid");
+  const executor = new Executor(uuid);
+</script>
diff --git a/test/wpt/tests/fetch/private-network-access/resources/fetcher.html b/test/wpt/tests/fetch/private-network-access/resources/fetcher.html
new file mode 100644
index 00000000000..000a5cc25bb
--- /dev/null
+++ b/test/wpt/tests/fetch/private-network-access/resources/fetcher.html
@@ -0,0 +1,21 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Fetcher</title>
+<script>
+  window.addEventListener("message", function (event) {
+    const { url, options } = event.data;
+    fetch(url, options)
+        .then(async function(response) {
+          const body = await response.text();
+          const message = {
+            ok: response.ok,
+            type: response.type,
+            body: body,
+          };
+          parent.postMessage(message, "*");
+        })
+        .catch(error => {
+          parent.postMessage({ error: error.toString() }, "*");
+        });
+  });
+</script>
diff --git a/test/wpt/tests/fetch/private-network-access/resources/fetcher.js b/test/wpt/tests/fetch/private-network-access/resources/fetcher.js
new file mode 100644
index 00000000000..3a1859876d4
--- /dev/null
+++ b/test/wpt/tests/fetch/private-network-access/resources/fetcher.js
@@ -0,0 +1,20 @@
+async function doFetch(url) {
+  const response = await fetch(url);
+  const body = await response.text();
+  return {
+    status: response.status,
+    body,
+  };
+}
+
+async function fetchAndPost(url) {
+  try {
+    const message = await doFetch(url);
+    self.postMessage(message);
+  } catch(e) {
+    self.postMessage({ error: e.name });
+  }
+}
+
+const url = new URL(self.location.href).searchParams.get("url");
+fetchAndPost(url);
diff --git a/test/wpt/tests/fetch/private-network-access/resources/iframed.html b/test/wpt/tests/fetch/private-network-access/resources/iframed.html
new file mode 100644
index 00000000000..c889c2882a4
--- /dev/null
+++ b/test/wpt/tests/fetch/private-network-access/resources/iframed.html
@@ -0,0 +1,7 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Iframed</title>
+<script>
+  const uuid = new URL(window.location).searchParams.get("iframe-uuid");
+  top.postMessage({ uuid, message: "loaded" }, "*");
+</script>
diff --git a/test/wpt/tests/fetch/private-network-access/resources/iframer.html b/test/wpt/tests/fetch/private-network-access/resources/iframer.html
new file mode 100644
index 00000000000..304cc54ae44
--- /dev/null
+++ b/test/wpt/tests/fetch/private-network-access/resources/iframer.html
@@ -0,0 +1,9 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Iframer</title>
+<body></body>
+<script>
+  const child = document.createElement("iframe");
+  child.src = new URL(window.location).searchParams.get("url");
+  document.body.appendChild(child);
+</script>
diff --git a/test/wpt/tests/fetch/private-network-access/resources/preflight.py b/test/wpt/tests/fetch/private-network-access/resources/preflight.py
new file mode 100644
index 00000000000..4aefee6f40d
--- /dev/null
+++ b/test/wpt/tests/fetch/private-network-access/resources/preflight.py
@@ -0,0 +1,169 @@
+# This endpoint responds to both preflight requests and the subsequent requests.
+#
+# Its behavior can be configured with various search/GET parameters, all of
+# which are optional:
+#
+# - treat-as-public-once: Must be a valid UUID if set.
+#   If set, then this endpoint expects to receive a non-preflight request first,
+#   for which it sets the `Content-Security-Policy: treat-as-public-address`
+#   response header. This allows testing "DNS rebinding", where a URL first
+#   resolves to the public IP address space, then a non-public IP address space.
+# - preflight-uuid: Must be a valid UUID if set, distinct from the value of the
+#   `treat-as-public-once` parameter if both are set.
+#   If set, then this endpoint expects to receive a preflight request first
+#   followed by a regular request, as in the regular CORS protocol. If the
+#   `treat-as-public-once` header is also set, it takes precedence: this
+#   endpoint expects to receive a non-preflight request first, then a preflight
+#   request, then finally a regular request.
+#   If unset, then this endpoint expects to receive no preflight request, only
+#   a regular (non-OPTIONS) request.
+# - preflight-headers: Valid values are:
+#   - cors: this endpoint responds with valid CORS headers to preflights. These
+#     should be sufficient for non-PNA preflight requests to succeed, but not
+#     for PNA-specific preflight requests.
+#   - cors+pna: this endpoint responds with valid CORS and PNA headers to
+#     preflights. These should be sufficient for both non-PNA preflight
+#     requests and PNA-specific preflight requests to succeed.
+#   - cors+pna+sw: this endpoint responds with valid CORS and PNA headers and
+#     "Access-Control-Allow-Headers: Service-Worker" to preflights. These should
+#     be sufficient for both non-PNA preflight requests and PNA-specific
+#     preflight requests to succeed. This allows the main request to fetch a
+#     service worker script.
+#   - unspecified, or any other value: this endpoint responds with no CORS or
+#     PNA headers. Preflight requests should fail.
+# - final-headers: Valid values are:
+#   - cors: this endpoint responds with valid CORS headers to CORS-enabled
+#     non-preflight requests. These should be sufficient for non-preflighted
+#     CORS-enabled requests to succeed.
+#   - unspecified: this endpoint responds with no CORS headers to non-preflight
+#     requests. This should fail CORS-enabled requests, but be sufficient for
+#     no-CORS requests.
+#
+# The following parameters only affect non-preflight responses:
+#
+# - redirect: If set, the response code is set to 301 and the `Location`
+#   response header is set to this value.
+# - mime-type: If set, the `Content-Type` response header is set to this value.
+# - file: Specifies a path (relative to this file's directory) to a file. If
+#   set, the response body is copied from this file.
+# - random-js-prefix: If set to any value, the response body is prefixed with
+#   a Javascript comment line containing a random value. This is useful in
+#   service worker tests, since service workers are only updated if the new
+#   script is not byte-for-byte identical with the old script.
+# - body: If set and `file` is not, the response body is set to this value.
+#
+
+import os
+import random
+
+from wptserve.utils import isomorphic_encode
+
+_ACAO = ("Access-Control-Allow-Origin", "*")
+_ACAPN = ("Access-Control-Allow-Private-Network", "true")
+_ACAH = ("Access-Control-Allow-Headers", "Service-Worker")
+
+def _get_response_headers(method, mode):
+  acam = ("Access-Control-Allow-Methods", method)
+
+  if mode == b"cors":
+    return [acam, _ACAO]
+
+  if mode == b"cors+pna":
+    return [acam, _ACAO, _ACAPN]
+
+  if mode == b"cors+pna+sw":
+    return [acam, _ACAO, _ACAPN, _ACAH]
+
+  return []
+
+def _get_expect_single_preflight(request):
+  return request.GET.get(b"expect-single-preflight")
+
+def _is_preflight_optional(request):
+  return request.GET.get(b"is-preflight-optional")
+
+def _get_preflight_uuid(request):
+  return request.GET.get(b"preflight-uuid")
+
+def _should_treat_as_public_once(request):
+  uuid = request.GET.get(b"treat-as-public-once")
+  if uuid is None:
+    # If the search parameter is not given, never treat as public.
+    return False
+
+  # If the parameter is given, we treat the request as public only if the UUID
+  # has never been seen and stashed.
+  result = request.server.stash.take(uuid) is None
+  request.server.stash.put(uuid, "")
+  return result
+
+def _handle_preflight_request(request, response):
+  if _should_treat_as_public_once(request):
+    return (400, [], "received preflight for first treat-as-public request")
+
+  uuid = _get_preflight_uuid(request)
+  if uuid is None:
+    return (400, [], "missing `preflight-uuid` param from preflight URL")
+
+  value = request.server.stash.take(uuid)
+  request.server.stash.put(uuid, "preflight")
+  if _get_expect_single_preflight(request) and value is not None:
+    return (400, [], "received duplicated preflight")
+
+  method = request.headers.get("Access-Control-Request-Method")
+  mode = request.GET.get(b"preflight-headers")
+  headers = _get_response_headers(method, mode)
+
+  return (headers, "preflight")
+
+def _final_response_body(request):
+  file_name = request.GET.get(b"file")
+  if file_name is None:
+    return request.GET.get(b"body") or "success"
+
+  prefix = b""
+  if request.GET.get(b"random-js-prefix"):
+    value = random.randint(0, 1000000000)
+    prefix = isomorphic_encode("// Random value: {}\n\n".format(value))
+
+  path = os.path.join(os.path.dirname(isomorphic_encode(__file__)), file_name)
+  with open(path, 'rb') as f:
+    contents = f.read()
+
+  return prefix + contents
+
+def _handle_final_request(request, response):
+  if _should_treat_as_public_once(request):
+    headers = [("Content-Security-Policy", "treat-as-public-address"),]
+  else:
+    uuid = _get_preflight_uuid(request)
+    if uuid is not None:
+      if (request.server.stash.take(uuid) is None and
+          not _is_preflight_optional(request)):
+        return (405, [], "no preflight received for {}".format(uuid))
+      request.server.stash.put(uuid, "final")
+
+    mode = request.GET.get(b"final-headers")
+    headers = _get_response_headers(request.method, mode)
+
+  redirect = request.GET.get(b"redirect")
+  if redirect is not None:
+    headers.append(("Location", redirect))
+    return (301, headers, b"")
+
+  mime_type = request.GET.get(b"mime-type")
+  if mime_type is not None:
+    headers.append(("Content-Type", mime_type),)
+
+  body = _final_response_body(request)
+  return (headers, body)
+
+def main(request, response):
+  try:
+    if request.method == "OPTIONS":
+      return _handle_preflight_request(request, response)
+    else:
+      return _handle_final_request(request, response)
+  except BaseException as e:
+    # Surface exceptions to the client, where they show up as assertion errors.
+    return (500, [("X-exception", str(e))], "exception: {}".format(e))
diff --git a/test/wpt/tests/fetch/private-network-access/resources/service-worker-bridge.html b/test/wpt/tests/fetch/private-network-access/resources/service-worker-bridge.html
new file mode 100644
index 00000000000..816de535fea
--- /dev/null
+++ b/test/wpt/tests/fetch/private-network-access/resources/service-worker-bridge.html
@@ -0,0 +1,155 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>ServiceWorker Bridge</title>
+<script src="/resources/testdriver.js"></script>
+<script src="/resources/testdriver-vendor.js"></script>
+<script>
+  // This bridge document exists to perform service worker commands on behalf
+  // of a test page. It lives within the same scope (including origin) as the
+  // service worker script, allowing it to be controlled by the service worker.
+
+  async function register({ url, options }) {
+    await navigator.serviceWorker.register(url, options);
+    return { loaded: true };
+  }
+
+  async function unregister({ scope }) {
+    const registration = await navigator.serviceWorker.getRegistration(scope);
+    if (!registration) {
+      return { unregistered: false, error: "no registration" };
+    }
+
+    const unregistered = await registration.unregister();
+    return { unregistered };
+  }
+
+  async function update({ scope }) {
+    const registration = await navigator.serviceWorker.getRegistration(scope);
+    if (!registration) {
+      return { updated: false, error: "no registration" };
+    }
+
+    const newRegistration = await registration.update();
+    return { updated: true };
+  }
+
+  // Total number of `controllerchange` events since document creation.
+  let totalNumControllerChanges = 0;
+  navigator.serviceWorker.addEventListener("controllerchange", () => {
+    totalNumControllerChanges++;
+  });
+
+  // Using `navigator.serviceWorker.ready` does not allow noticing new
+  // controllers after an update, so we count `controllerchange` events instead.
+  // This has the added benefit of ensuring that subsequent fetches are handled
+  // by the service worker, whereas `ready` does not guarantee that.
+  async function wait({ numControllerChanges }) {
+    if (totalNumControllerChanges >= numControllerChanges) {
+      return {
+        controlled: !!navigator.serviceWorker.controller,
+        numControllerChanges: totalNumControllerChanges,
+      };
+    }
+
+    let remaining = numControllerChanges - totalNumControllerChanges;
+    await new Promise((resolve) => {
+      navigator.serviceWorker.addEventListener("controllerchange", () => {
+        remaining--;
+        if (remaining == 0) {
+          resolve();
+        }
+      });
+    });
+
+    return {
+      controlled: !!navigator.serviceWorker.controller,
+      numControllerChanges,
+    };
+  }
+
+  async function doFetch({ url, options }) {
+    const response = await fetch(url, options);
+    const body = await response.text();
+    return {
+      ok: response.ok,
+      body,
+    };
+  }
+
+  async function setPermission({ name, state }) {
+    await test_driver.set_permission({ name }, state);
+
+    // Double-check, just to be sure.
+    // See the comment in `../service-worker-background-fetch.js`.
+    const permissionStatus = await navigator.permissions.query({ name });
+    return { state: permissionStatus.state };
+  }
+
+  async function backgroundFetch({ scope, url }) {
+    const registration = await navigator.serviceWorker.getRegistration(scope);
+    if (!registration) {
+      return { error: "no registration" };
+    }
+
+    const fetchRegistration =
+        await registration.backgroundFetch.fetch("test", url);
+    const resultReady = new Promise((resolve) => {
+      fetchRegistration.addEventListener("progress", () => {
+        if (fetchRegistration.result) {
+          resolve();
+        }
+      });
+    });
+
+    let ok;
+    let body;
+    const record = await fetchRegistration.match(url);
+    if (record) {
+      const response = await record.responseReady;
+      body = await response.text();
+      ok = response.ok;
+    }
+
+    // Wait for the result after getting the response. If the steps are
+    // inverted, then sometimes the response is not found due to an
+    // `UnknownError`.
+    await resultReady;
+
+    return {
+      result: fetchRegistration.result,
+      failureReason: fetchRegistration.failureReason,
+      ok,
+      body,
+    };
+  }
+
+  function getAction(action) {
+    switch (action) {
+      case "register":
+        return register;
+      case "unregister":
+        return unregister;
+      case "wait":
+        return wait;
+      case "update":
+        return update;
+      case "fetch":
+        return doFetch;
+      case "set-permission":
+        return setPermission;
+      case "background-fetch":
+        return backgroundFetch;
+    }
+  }
+
+  window.addEventListener("message", async (evt) => {
+    let message;
+    try {
+      const action = getAction(evt.data.action);
+      message = await action(evt.data);
+    } catch(e) {
+      message = { error: e.name };
+    }
+    parent.postMessage(message, "*");
+  });
+</script>
diff --git a/test/wpt/tests/fetch/private-network-access/resources/service-worker.js b/test/wpt/tests/fetch/private-network-access/resources/service-worker.js
new file mode 100644
index 00000000000..bca71ad910c
--- /dev/null
+++ b/test/wpt/tests/fetch/private-network-access/resources/service-worker.js
@@ -0,0 +1,18 @@
+self.addEventListener("install", () => {
+  // Skip waiting before replacing the previously-active service worker, if any.
+  // This allows the bridge script to notice the controller change and query
+  // the install time via fetch.
+  self.skipWaiting();
+});
+
+self.addEventListener("activate", (event) => {
+  // Claim all clients so that the bridge script notices the activation.
+  event.waitUntil(self.clients.claim());
+});
+
+self.addEventListener("fetch", (event) => {
+  const url = new URL(event.request.url).searchParams.get("proxied-url");
+  if (url) {
+    event.respondWith(fetch(url));
+  }
+});
diff --git a/test/wpt/tests/fetch/private-network-access/resources/shared-fetcher.js b/test/wpt/tests/fetch/private-network-access/resources/shared-fetcher.js
new file mode 100644
index 00000000000..30bde1e0542
--- /dev/null
+++ b/test/wpt/tests/fetch/private-network-access/resources/shared-fetcher.js
@@ -0,0 +1,23 @@
+async function doFetch(url) {
+  const response = await fetch(url);
+  const body = await response.text();
+  return {
+    status: response.status,
+    body,
+  };
+}
+
+async function fetchAndPost(url, port) {
+  try {
+    const message = await doFetch(url);
+    port.postMessage(message);
+  } catch(e) {
+    port.postMessage({ error: e.name });
+  }
+}
+
+const url = new URL(self.location.href).searchParams.get("url");
+
+self.addEventListener("connect", async (evt) => {
+  await fetchAndPost(url, evt.ports[0]);
+});
diff --git a/test/wpt/tests/fetch/private-network-access/resources/shared-worker-blob-fetcher.html b/test/wpt/tests/fetch/private-network-access/resources/shared-worker-blob-fetcher.html
new file mode 100644
index 00000000000..a79869b2f96
--- /dev/null
+++ b/test/wpt/tests/fetch/private-network-access/resources/shared-worker-blob-fetcher.html
@@ -0,0 +1,50 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>SharedWorker Blob Fetcher</title>
+<script>
+  window.addEventListener("message", function (evt) {
+    let { url } = evt.data;
+
+    const workerScriptContent = `
+      async function doFetch(url) {
+        const response = await fetch(url);
+        const body = await response.text();
+        return {
+          status: response.status,
+          body,
+        };
+      }
+
+      async function fetchAndPost(url, port) {
+        try {
+          const message = await doFetch(url);
+          port.postMessage(message);
+        } catch(e) {
+          port.postMessage({ error: e.name });
+        }
+      }
+
+      const url = "${url}";
+
+      self.addEventListener("connect", async (evt) => {
+        await fetchAndPost(url, evt.ports[0]);
+      });
+    `;
+    const blob =
+        new Blob([workerScriptContent], {type: 'application/javascript'});
+    const workerScriptUrl = URL.createObjectURL(blob);
+
+    const worker = new SharedWorker(workerScriptUrl);
+
+    URL.revokeObjectURL(workerScriptUrl);
+
+    worker.onerror = (evt) => {
+      parent.postMessage({ error: evt.message || "unknown error" }, "*");
+    };
+
+    worker.port.addEventListener("message", (evt) => {
+      parent.postMessage(evt.data, "*");
+    });
+    worker.port.start();
+  });
+</script>
diff --git a/test/wpt/tests/fetch/private-network-access/resources/shared-worker-fetcher.html b/test/wpt/tests/fetch/private-network-access/resources/shared-worker-fetcher.html
new file mode 100644
index 00000000000..4af4b1f2395
--- /dev/null
+++ b/test/wpt/tests/fetch/private-network-access/resources/shared-worker-fetcher.html
@@ -0,0 +1,19 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>SharedWorker Fetcher</title>
+<script>
+  window.addEventListener("message", function (evt) {
+    let { url } = evt.data;
+
+    const worker = new SharedWorker(url);
+
+    worker.onerror = (evt) => {
+      parent.postMessage({ error: evt.message || "unknown error" }, "*");
+    };
+
+    worker.port.addEventListener("message", (evt) => {
+      parent.postMessage(evt.data, "*");
+    });
+    worker.port.start();
+  });
+</script>
diff --git a/test/wpt/tests/fetch/private-network-access/resources/socket-opener.html b/test/wpt/tests/fetch/private-network-access/resources/socket-opener.html
new file mode 100644
index 00000000000..48d27216bed
--- /dev/null
+++ b/test/wpt/tests/fetch/private-network-access/resources/socket-opener.html
@@ -0,0 +1,15 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>WebSocket Opener</title>
+<script>
+  window.addEventListener("message", function (event) {
+    const socket = new WebSocket(event.data);
+
+    socket.onopen = () => {
+      parent.postMessage("open", "*");
+    };
+    socket.onclose = (evt) => {
+      parent.postMessage(`close: code ${evt.code}`, "*");
+    };
+  });
+</script>
diff --git a/test/wpt/tests/fetch/private-network-access/resources/support.sub.js b/test/wpt/tests/fetch/private-network-access/resources/support.sub.js
new file mode 100644
index 00000000000..210184ec4b6
--- /dev/null
+++ b/test/wpt/tests/fetch/private-network-access/resources/support.sub.js
@@ -0,0 +1,691 @@
+// Creates a new iframe in `doc`, calls `func` on it and appends it as a child
+// of `doc`.
+// Returns a promise that resolves to the iframe once loaded (successfully or
+// not).
+// The iframe is removed from `doc` once test `t` is done running.
+//
+// NOTE: There exists no interoperable way to check whether an iframe failed to
+// load, so this should only be used when the iframe is expected to load. It
+// also means we cannot wire the iframe's `error` event to a promise
+// rejection. See: https://github.com/whatwg/html/issues/125
+function appendIframeWith(t, doc, func) {
+  return new Promise(resolve => {
+      const child = doc.createElement("iframe");
+      t.add_cleanup(() => child.remove());
+
+      child.addEventListener("load", () => resolve(child), { once: true });
+      func(child);
+      doc.body.appendChild(child);
+    });
+}
+
+// Appends a child iframe to `doc` sourced from `src`.
+//
+// See `appendIframeWith()` for more details.
+function appendIframe(t, doc, src) {
+  return appendIframeWith(t, doc, child => { child.src = src; });
+}
+
+// Registers an event listener that will resolve this promise when this
+// window receives a message posted to it.
+//
+// `options` has the following shape:
+//
+//  {
+//    source: If specified, this function waits for the first message from the
+//      given source only, ignoring other messages.
+//
+//    filter: If specified, this function calls `filter` on each incoming
+//      message, and resolves iff it returns true.
+//  }
+//
+function futureMessage(options) {
+  return new Promise(resolve => {
+    window.addEventListener("message", (e) => {
+      if (options?.source && options.source !== e.source) {
+        return;
+      }
+
+      if (options?.filter && !options.filter(e.data)) {
+        return;
+      }
+
+      resolve(e.data);
+    });
+  });
+};
+
+// Like `promise_test()`, but executes tests in parallel like `async_test()`.
+//
+// Cribbed from COEP tests.
+function promise_test_parallel(promise, description) {
+  async_test(test => {
+    promise(test)
+        .then(() => test.done())
+        .catch(test.step_func(error => { throw error; }));
+  }, description);
+};
+
+async function postMessageAndAwaitReply(target, message) {
+  const reply = futureMessage({ source: target });
+  target.postMessage(message, "*");
+  return await reply;
+}
+
+// Maps protocol (without the trailing colon) and address space to port.
+const SERVER_PORTS = {
+  "http": {
+    "local": {{ports[http][0]}},
+    "private": {{ports[http-private][0]}},
+    "public": {{ports[http-public][0]}},
+  },
+  "https": {
+    "local": {{ports[https][0]}},
+    "private": {{ports[https-private][0]}},
+    "public": {{ports[https-public][0]}},
+  },
+  "ws": {
+    "local": {{ports[ws][0]}},
+  },
+  "wss": {
+    "local": {{ports[wss][0]}},
+  },
+};
+
+// A `Server` is a web server accessible by tests. It has the following shape:
+//
+// {
+//   addressSpace: the IP address space of the server ("local", "private" or
+//     "public"),
+//   name: a human-readable name for the server,
+//   port: the port on which the server listens for connections,
+//   protocol: the protocol (including trailing colon) spoken by the server,
+// }
+//
+// Constants below define the available servers, which can also be accessed
+// programmatically with `get()`.
+class Server {
+  // Maps the given `protocol` (without a trailing colon) and `addressSpace` to
+  // a server. Returns null if no such server exists.
+  static get(protocol, addressSpace) {
+    const ports = SERVER_PORTS[protocol];
+    if (ports === undefined) {
+      return null;
+    }
+
+    const port = ports[addressSpace];
+    if (port === undefined) {
+      return null;
+    }
+
+    return {
+      addressSpace,
+      name: `${protocol}-${addressSpace}`,
+      port,
+      protocol: protocol + ':',
+    };
+  }
+
+  static HTTP_LOCAL = Server.get("http", "local");
+  static HTTP_PRIVATE = Server.get("http", "private");
+  static HTTP_PUBLIC = Server.get("http", "public");
+  static HTTPS_LOCAL = Server.get("https", "local");
+  static HTTPS_PRIVATE = Server.get("https", "private");
+  static HTTPS_PUBLIC = Server.get("https", "public");
+  static WS_LOCAL = Server.get("ws", "local");
+  static WSS_LOCAL = Server.get("wss", "local");
+};
+
+// Resolves a URL relative to the current location, returning an absolute URL.
+//
+// `url` specifies the relative URL, e.g. "foo.html" or "http://foo.example".
+// `options`, if defined, should have the following shape:
+//
+//   {
+//     // Optional. Overrides the protocol of the returned URL.
+//     protocol,
+//
+//     // Optional. Overrides the port of the returned URL.
+//     port,
+//
+//     // Extra headers.
+//     headers,
+//
+//     // Extra search params.
+//     searchParams,
+//   }
+//
+function resolveUrl(url, options) {
+  const result = new URL(url, window.location);
+  if (options === undefined) {
+    return result;
+  }
+
+  const { port, protocol, headers, searchParams } = options;
+  if (port !== undefined) {
+    result.port = port;
+  }
+  if (protocol !== undefined) {
+    result.protocol = protocol;
+  }
+  if (headers !== undefined) {
+    const pipes = [];
+    for (key in headers) {
+      pipes.push(`header(${key},${headers[key]})`);
+    }
+    result.searchParams.append("pipe", pipes.join("|"));
+  }
+  if (searchParams !== undefined) {
+    for (key in searchParams) {
+      result.searchParams.append(key, searchParams[key]);
+    }
+  }
+
+  return result;
+}
+
+// Computes options to pass to `resolveUrl()` for a source document's URL.
+//
+// `server` identifies the server from which to load the document.
+// `treatAsPublic`, if set to true, specifies that the source document should
+// be artificially placed in the `public` address space using CSP.
+function sourceResolveOptions({ server, treatAsPublic }) {
+  const options = {...server};
+  if (treatAsPublic) {
+    options.headers = { "Content-Security-Policy": "treat-as-public-address" };
+  }
+  return options;
+}
+
+// Computes the URL of a preflight handler configured with the given options.
+//
+// `server` identifies the server from which to load the resource.
+// `behavior` specifies the behavior of the target server. It may contain:
+//   - `preflight`: The result of calling one of `PreflightBehavior`'s methods.
+//   - `response`: The result of calling one of `ResponseBehavior`'s methods.
+//   - `redirect`: A URL to which the target should redirect GET requests.
+function preflightUrl({ server, behavior }) {
+  const options = {...server};
+  if (behavior) {
+    const { preflight, response, redirect } = behavior;
+    options.searchParams = {
+      ...preflight,
+      ...response,
+    };
+    if (redirect !== undefined) {
+      options.searchParams.redirect = redirect;
+    }
+  }
+
+  return resolveUrl("resources/preflight.py", options);
+}
+
+// Methods generate behavior specifications for how `resources/preflight.py`
+// should behave upon receiving a preflight request.
+const PreflightBehavior = {
+  // The preflight response should fail with a non-2xx code.
+  failure: () => ({}),
+
+  // The preflight response should be missing CORS headers.
+  // `uuid` should be a UUID that uniquely identifies the preflight request.
+  noCorsHeader: (uuid) => ({
+    "preflight-uuid": uuid,
+  }),
+
+  // The preflight response should be missing PNA headers.
+  // `uuid` should be a UUID that uniquely identifies the preflight request.
+  noPnaHeader: (uuid) => ({
+    "preflight-uuid": uuid,
+    "preflight-headers": "cors",
+  }),
+
+  // The preflight response should succeed.
+  // `uuid` should be a UUID that uniquely identifies the preflight request.
+  success: (uuid) => ({
+    "preflight-uuid": uuid,
+    "preflight-headers": "cors+pna",
+  }),
+
+  optionalSuccess: (uuid) => ({
+    "preflight-uuid": uuid,
+    "preflight-headers": "cors+pna",
+    "is-preflight-optional": true,
+  }),
+
+  // The preflight response should succeed and allow service-worker header.
+  // `uuid` should be a UUID that uniquely identifies the preflight request.
+  serviceWorkerSuccess: (uuid) => ({
+    "preflight-uuid": uuid,
+    "preflight-headers": "cors+pna+sw",
+  }),
+
+  // The preflight response should succeed only if it is the first preflight.
+  // `uuid` should be a UUID that uniquely identifies the preflight request.
+  singlePreflight: (uuid) => ({
+    "preflight-uuid": uuid,
+    "preflight-headers": "cors+pna",
+    "expect-single-preflight": true,
+  }),
+};
+
+// Methods generate behavior specifications for how `resources/preflight.py`
+// should behave upon receiving a regular (non-preflight) request.
+const ResponseBehavior = {
+  // The response should succeed without CORS headers.
+  default: () => ({}),
+
+  // The response should succeed with CORS headers.
+  allowCrossOrigin: () => ({ "final-headers": "cors" }),
+};
+
+const FetchTestResult = {
+  SUCCESS: {
+    ok: true,
+    body: "success",
+  },
+  OPAQUE: {
+    ok: false,
+    type: "opaque",
+    body: "",
+  },
+  FAILURE: {
+    error: "TypeError: Failed to fetch",
+  },
+};
+
+// Runs a fetch test. Tries to fetch a given subresource from a given document.
+//
+// Main argument shape:
+//
+//   {
+//     // Optional. Passed to `sourceResolveOptions()`.
+//     source,
+//
+//     // Optional. Passed to `preflightUrl()`.
+//     target,
+//
+//     // Optional. Passed to `fetch()`.
+//     fetchOptions,
+//
+//     // Required. One of the values in `FetchTestResult`.
+//     expected,
+//   }
+//
+async function fetchTest(t, { source, target, fetchOptions, expected }) {
+  const sourceUrl =
+      resolveUrl("resources/fetcher.html", sourceResolveOptions(source));
+
+  const targetUrl = preflightUrl(target);
+
+  const iframe = await appendIframe(t, document, sourceUrl);
+  const reply = futureMessage({ source: iframe.contentWindow });
+
+  const message = {
+    url: targetUrl.href,
+    options: fetchOptions,
+  };
+  iframe.contentWindow.postMessage(message, "*");
+
+  const { error, ok, type, body } = await reply;
+
+  assert_equals(error, expected.error, "error");
+
+  assert_equals(ok, expected.ok, "response ok");
+  assert_equals(body, expected.body, "response body");
+
+  if (expected.type !== undefined) {
+    assert_equals(type, expected.type, "response type");
+  }
+}
+
+const XhrTestResult = {
+  SUCCESS: {
+    loaded: true,
+    status: 200,
+    body: "success",
+  },
+  FAILURE: {
+    loaded: false,
+    status: 0,
+  },
+};
+
+// Runs an XHR test. Tries to fetch a given subresource from a given document.
+//
+// Main argument shape:
+//
+//   {
+//     // Optional. Passed to `sourceResolveOptions()`.
+//     source,
+//
+//     // Optional. Passed to `preflightUrl()`.
+//     target,
+//
+//     // Optional. Method to use when sending the request. Defaults to "GET".
+//     method,
+//
+//     // Required. One of the values in `XhrTestResult`.
+//     expected,
+//   }
+//
+async function xhrTest(t, { source, target, method, expected }) {
+  const sourceUrl =
+      resolveUrl("resources/xhr-sender.html", sourceResolveOptions(source));
+
+  const targetUrl = preflightUrl(target);
+
+  const iframe = await appendIframe(t, document, sourceUrl);
+  const reply = futureMessage();
+
+  const message = {
+    url: targetUrl.href,
+    method: method,
+  };
+  iframe.contentWindow.postMessage(message, "*");
+
+  const { loaded, status, body } = await reply;
+
+  assert_equals(loaded, expected.loaded, "response loaded");
+  assert_equals(status, expected.status, "response status");
+  assert_equals(body, expected.body, "response body");
+}
+
+const IframeTestResult = {
+  SUCCESS: "loaded",
+  FAILURE: "timeout",
+};
+
+async function iframeTest(t, { source, target, expected }) {
+  // Allows running tests in parallel.
+  const uuid = token();
+
+  const targetUrl = preflightUrl(target);
+  targetUrl.searchParams.set("file", "iframed.html");
+  targetUrl.searchParams.set("iframe-uuid", uuid);
+
+  const sourceUrl =
+      resolveUrl("resources/iframer.html", sourceResolveOptions(source));
+  sourceUrl.searchParams.set("url", targetUrl);
+
+  const messagePromise = futureMessage({
+    filter: (data) => data.uuid === uuid,
+  });
+  const iframe = await appendIframe(t, document, sourceUrl);
+
+  // The grandchild frame posts a message iff it loads successfully.
+  // There exists no interoperable way to check whether an iframe failed to
+  // load, so we use a timeout.
+  // See: https://github.com/whatwg/html/issues/125
+  const result = await Promise.race([
+      messagePromise.then((data) => data.message),
+      new Promise((resolve) => {
+        t.step_timeout(() => resolve("timeout"), 500 /* ms */);
+      }),
+  ]);
+
+  assert_equals(result, expected);
+}
+
+const iframeGrandparentTest = ({
+  name,
+  grandparentServer,
+  child,
+  grandchild,
+  expected,
+}) => promise_test_parallel(async (t) => {
+  // Allows running tests in parallel.
+  const grandparentUuid = token();
+  const childUuid = token();
+  const grandchildUuid = token();
+
+  const grandparentUrl =
+      resolveUrl("resources/executor.html", grandparentServer);
+  grandparentUrl.searchParams.set("executor-uuid", grandparentUuid);
+
+  const childUrl = preflightUrl(child);
+  childUrl.searchParams.set("file", "executor.html");
+  childUrl.searchParams.set("executor-uuid", childUuid);
+
+  const grandchildUrl = preflightUrl(grandchild);
+  grandchildUrl.searchParams.set("file", "iframed.html");
+  grandchildUrl.searchParams.set("iframe-uuid", grandchildUuid);
+
+  const iframe = await appendIframe(t, document, grandparentUrl);
+
+  const addChild = (url) => new Promise((resolve) => {
+    const child = document.createElement("iframe");
+    child.src = url;
+    child.addEventListener("load", () => resolve(), { once: true });
+    document.body.appendChild(child);
+  });
+
+  const grandparentCtx = new RemoteContext(grandparentUuid);
+  await grandparentCtx.execute_script(addChild, [childUrl]);
+
+  // Add a blank grandchild frame inside the child.
+  // Apply a timeout to this step so that failures at this step do not block the
+  // execution of other tests.
+  const childCtx = new RemoteContext(childUuid);
+  await Promise.race([
+      childCtx.execute_script(addChild, ["about:blank"]),
+      new Promise((resolve, reject) => t.step_timeout(
+          () => reject("timeout adding grandchild"),
+          2000 /* ms */
+      )),
+  ]);
+
+  const messagePromise = futureMessage({
+    filter: (data) => data.uuid === grandchildUuid,
+  });
+  await grandparentCtx.execute_script((url) => {
+    const child = window.frames[0];
+    const grandchild = child.frames[0];
+    grandchild.location = url;
+  }, [grandchildUrl]);
+
+  // The great-grandchild frame posts a message iff it loads successfully.
+  // There exists no interoperable way to check whether an iframe failed to
+  // load, so we use a timeout.
+  // See: https://github.com/whatwg/html/issues/125
+  const result = await Promise.race([
+      messagePromise.then((data) => data.message),
+      new Promise((resolve) => {
+        t.step_timeout(() => resolve("timeout"), 2000 /* ms */);
+      }),
+  ]);
+
+  assert_equals(result, expected);
+}, name);
+
+const WebsocketTestResult = {
+  SUCCESS: "open",
+
+  // The code is a best guess. It is not yet entirely specified, so it may need
+  // to be changed in the future based on implementation experience.
+  FAILURE: "close: code 1006",
+};
+
+// Runs a websocket test. Attempts to open a websocket from `source` (in an
+// iframe) to `target`, then checks that the result is as `expected`.
+//
+// Argument shape:
+//
+// {
+//   // Required. Passed to `sourceResolveOptions()`.
+//   source,
+//
+//   // Required.
+//   target: {
+//     // Required. Target server.
+//     server,
+//   }
+//
+//   // Required. Should be one of the values in `WebsocketTestResult`.
+//   expected,
+// }
+//
+async function websocketTest(t, { source, target, expected }) {
+  const sourceUrl =
+      resolveUrl("resources/socket-opener.html", sourceResolveOptions(source));
+
+  const targetUrl = resolveUrl("/echo", target.server);
+
+  const iframe = await appendIframe(t, document, sourceUrl);
+
+  const reply = futureMessage();
+  iframe.contentWindow.postMessage(targetUrl.href, "*");
+
+  assert_equals(await reply, expected);
+}
+
+const WorkerScriptTestResult = {
+  SUCCESS: { loaded: true },
+  FAILURE: { error: "unknown error" },
+};
+
+function workerScriptUrl(target) {
+  const url = preflightUrl(target);
+
+  url.searchParams.append("body", "postMessage({ loaded: true })")
+  url.searchParams.append("mime-type", "application/javascript")
+
+  return url;
+}
+
+async function workerScriptTest(t, { source, target, expected }) {
+  const sourceUrl =
+      resolveUrl("resources/worker-fetcher.html", sourceResolveOptions(source));
+
+  const targetUrl = workerScriptUrl(target);
+
+  const iframe = await appendIframe(t, document, sourceUrl);
+  const reply = futureMessage();
+
+  iframe.contentWindow.postMessage({ url: targetUrl.href }, "*");
+
+  const { error, loaded } = await reply;
+
+  assert_equals(error, expected.error, "worker error");
+  assert_equals(loaded, expected.loaded, "response loaded");
+}
+
+async function nestedWorkerScriptTest(t, { source, target, expected }) {
+  const targetUrl = workerScriptUrl(target);
+
+  const sourceUrl = resolveUrl(
+      "resources/worker-fetcher.js", sourceResolveOptions(source));
+  sourceUrl.searchParams.append("url", targetUrl);
+
+  // Iframe must be same-origin with the parent worker.
+  const iframeUrl = new URL("worker-fetcher.html", sourceUrl);
+
+  const iframe = await appendIframe(t, document, iframeUrl);
+  const reply = futureMessage();
+
+  iframe.contentWindow.postMessage({ url: sourceUrl.href }, "*");
+
+  const { error, loaded } = await reply;
+
+  assert_equals(error, expected.error, "worker error");
+  assert_equals(loaded, expected.loaded, "response loaded");
+}
+
+async function sharedWorkerScriptTest(t, { source, target, expected }) {
+  const sourceUrl = resolveUrl("resources/shared-worker-fetcher.html",
+                               sourceResolveOptions(source));
+  const targetUrl = preflightUrl(target);
+  targetUrl.searchParams.append(
+      "body", "onconnect = (e) => e.ports[0].postMessage({ loaded: true })")
+  targetUrl.searchParams.append("mime-type", "application/javascript")
+
+  const iframe = await appendIframe(t, document, sourceUrl);
+  const reply = futureMessage();
+
+  iframe.contentWindow.postMessage({ url: targetUrl.href }, "*");
+
+  const { error, loaded } = await reply;
+
+  assert_equals(error, expected.error, "worker error");
+  assert_equals(loaded, expected.loaded, "response loaded");
+}
+
+// Results that may be expected in tests.
+const WorkerFetchTestResult = {
+  SUCCESS: { status: 200, body: "success" },
+  FAILURE: { error: "TypeError" },
+};
+
+async function workerFetchTest(t, { source, target, expected }) {
+  const targetUrl = preflightUrl(target);
+
+  const sourceUrl =
+      resolveUrl("resources/fetcher.js", sourceResolveOptions(source));
+  sourceUrl.searchParams.append("url", targetUrl.href);
+
+  const fetcherUrl = new URL("worker-fetcher.html", sourceUrl);
+
+  const reply = futureMessage();
+  const iframe = await appendIframe(t, document, fetcherUrl);
+
+  iframe.contentWindow.postMessage({ url: sourceUrl.href }, "*");
+
+  const { error, status, body } = await reply;
+  assert_equals(error, expected.error, "fetch error");
+  assert_equals(status, expected.status, "response status");
+  assert_equals(body, expected.body, "response body");
+}
+
+async function workerBlobFetchTest(t, { source, target, expected }) {
+  const targetUrl = preflightUrl(target);
+
+  const fetcherUrl = resolveUrl(
+      'resources/worker-blob-fetcher.html', sourceResolveOptions(source));
+
+  const reply = futureMessage();
+  const iframe = await appendIframe(t, document, fetcherUrl);
+
+  iframe.contentWindow.postMessage({ url: targetUrl.href }, "*");
+
+  const { error, status, body } = await reply;
+  assert_equals(error, expected.error, "fetch error");
+  assert_equals(status, expected.status, "response status");
+  assert_equals(body, expected.body, "response body");
+}
+
+async function sharedWorkerFetchTest(t, { source, target, expected }) {
+  const targetUrl = preflightUrl(target);
+
+  const sourceUrl =
+      resolveUrl("resources/shared-fetcher.js", sourceResolveOptions(source));
+  sourceUrl.searchParams.append("url", targetUrl.href);
+
+  const fetcherUrl = new URL("shared-worker-fetcher.html", sourceUrl);
+
+  const reply = futureMessage();
+  const iframe = await appendIframe(t, document, fetcherUrl);
+
+  iframe.contentWindow.postMessage({ url: sourceUrl.href }, "*");
+
+  const { error, status, body } = await reply;
+  assert_equals(error, expected.error, "fetch error");
+  assert_equals(status, expected.status, "response status");
+  assert_equals(body, expected.body, "response body");
+}
+
+async function sharedWorkerBlobFetchTest(t, { source, target, expected }) {
+  const targetUrl = preflightUrl(target);
+
+  const fetcherUrl = resolveUrl(
+      'resources/shared-worker-blob-fetcher.html',
+      sourceResolveOptions(source));
+
+  const reply = futureMessage();
+  const iframe = await appendIframe(t, document, fetcherUrl);
+
+  iframe.contentWindow.postMessage({ url: targetUrl.href }, "*");
+
+  const { error, status, body } = await reply;
+  assert_equals(error, expected.error, "fetch error");
+  assert_equals(status, expected.status, "response status");
+  assert_equals(body, expected.body, "response body");
+}
diff --git a/test/wpt/tests/fetch/private-network-access/resources/worker-blob-fetcher.html b/test/wpt/tests/fetch/private-network-access/resources/worker-blob-fetcher.html
new file mode 100644
index 00000000000..5a50271e11b
--- /dev/null
+++ b/test/wpt/tests/fetch/private-network-access/resources/worker-blob-fetcher.html
@@ -0,0 +1,45 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Worker Blob Fetcher</title>
+<script>
+  window.addEventListener("message", function (evt) {
+    const { url } = evt.data;
+
+    const workerScriptContent = `
+      async function doFetch(url) {
+        const response = await fetch(url);
+        const body = await response.text();
+        return {
+          status: response.status,
+          body,
+        };
+      }
+
+      async function fetchAndPost(url) {
+        try {
+          const message = await doFetch(url);
+          self.postMessage(message);
+        } catch(e) {
+          self.postMessage({ error: e.name });
+        }
+      }
+
+      fetchAndPost("${url}");
+    `;
+    const blob =
+        new Blob([workerScriptContent], {type: 'application/javascript'});
+    const workerScriptUrl = URL.createObjectURL(blob);
+
+    const worker = new Worker(workerScriptUrl);
+
+    URL.revokeObjectURL(workerScriptUrl);
+
+    worker.addEventListener("message", (evt) => {
+      parent.postMessage(evt.data, "*");
+    });
+
+    worker.addEventListener("error", (evt) => {
+      parent.postMessage({ error: evt.message || "unknown error" }, "*");
+    });
+  });
+</script>
diff --git a/test/wpt/tests/fetch/private-network-access/resources/worker-fetcher.html b/test/wpt/tests/fetch/private-network-access/resources/worker-fetcher.html
new file mode 100644
index 00000000000..bd155a532bd
--- /dev/null
+++ b/test/wpt/tests/fetch/private-network-access/resources/worker-fetcher.html
@@ -0,0 +1,18 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Worker Fetcher</title>
+<script>
+  window.addEventListener("message", function (evt) {
+    let { url } = evt.data;
+
+    const worker = new Worker(url);
+
+    worker.addEventListener("message", (evt) => {
+      parent.postMessage(evt.data, "*");
+    });
+
+    worker.addEventListener("error", (evt) => {
+      parent.postMessage({ error: evt.message || "unknown error" }, "*");
+    });
+  });
+</script>
diff --git a/test/wpt/tests/fetch/private-network-access/resources/worker-fetcher.js b/test/wpt/tests/fetch/private-network-access/resources/worker-fetcher.js
new file mode 100644
index 00000000000..aab49afe6f4
--- /dev/null
+++ b/test/wpt/tests/fetch/private-network-access/resources/worker-fetcher.js
@@ -0,0 +1,11 @@
+const url = new URL(self.location).searchParams.get("url");
+const worker = new Worker(url);
+
+// Relay messages from the worker to the parent frame.
+worker.addEventListener("message", (evt) => {
+  self.postMessage(evt.data);
+});
+
+worker.addEventListener("error", (evt) => {
+  self.postMessage({ error: evt.message || "unknown error" });
+});
diff --git a/test/wpt/tests/fetch/private-network-access/resources/xhr-sender.html b/test/wpt/tests/fetch/private-network-access/resources/xhr-sender.html
new file mode 100644
index 00000000000..b131fa41f9a
--- /dev/null
+++ b/test/wpt/tests/fetch/private-network-access/resources/xhr-sender.html
@@ -0,0 +1,33 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>XHR Sender</title>
+<script>
+  window.addEventListener("message", function (event) {
+    let { url, method } = event.data;
+    if (!method) {
+      method = "GET";
+    }
+
+    const xhr = new XMLHttpRequest;
+
+    xhr.addEventListener("load", (evt) => {
+      const message = {
+        loaded: true,
+        status: xhr.status,
+        body: xhr.responseText,
+      };
+      parent.postMessage(message, "*");
+    });
+
+    xhr.addEventListener("error", (evt) => {
+      const message = {
+        loaded: false,
+        status: xhr.status,
+      };
+      parent.postMessage(message, "*");
+    });
+
+    xhr.open(method, url);
+    xhr.send();
+  });
+</script>
diff --git a/test/wpt/tests/fetch/private-network-access/service-worker-background-fetch.https.window.js b/test/wpt/tests/fetch/private-network-access/service-worker-background-fetch.https.window.js
new file mode 100644
index 00000000000..6369b166e21
--- /dev/null
+++ b/test/wpt/tests/fetch/private-network-access/service-worker-background-fetch.https.window.js
@@ -0,0 +1,142 @@
+// META: script=/common/utils.js
+// META: script=resources/support.sub.js
+//
+// Spec: https://wicg.github.io/private-network-access/#integration-fetch
+// Spec: https://wicg.github.io/background-fetch/
+//
+// These tests check that background fetches from within `ServiceWorker` scripts
+// are not subject to Private Network Access checks.
+
+// Results that may be expected in tests.
+const TestResult = {
+  SUCCESS: { ok: true, body: "success", result: "success", failureReason: "" },
+};
+
+async function makeTest(t, { source, target, expected }) {
+  const scriptUrl =
+      resolveUrl("resources/service-worker.js", sourceResolveOptions(source));
+
+  const bridgeUrl = new URL("service-worker-bridge.html", scriptUrl);
+
+  const targetUrl = preflightUrl(target);
+
+  const iframe = await appendIframe(t, document, bridgeUrl);
+
+  const request = (message) => {
+    const reply = futureMessage();
+    iframe.contentWindow.postMessage(message, "*");
+    return reply;
+  };
+
+  {
+    const { error, loaded } = await request({
+      action: "register",
+      url: scriptUrl.href,
+    });
+
+    assert_equals(error, undefined, "register error");
+    assert_true(loaded, "response loaded");
+  }
+
+  {
+    const { error, state } = await request({
+      action: "set-permission",
+      name: "background-fetch",
+      state: "granted",
+    });
+
+    assert_equals(error, undefined, "set permission error");
+    assert_equals(state, "granted", "permission state");
+  }
+
+  {
+    const { error, result, failureReason, ok, body } = await request({
+      action: "background-fetch",
+      url: targetUrl.href,
+    });
+
+    assert_equals(error, expected.error, "error");
+    assert_equals(failureReason, expected.failureReason, "fetch failure reason");
+    assert_equals(result, expected.result, "fetch result");
+    assert_equals(ok, expected.ok, "response ok");
+    assert_equals(body, expected.body, "response body");
+  }
+}
+
+promise_test(t => makeTest(t, {
+  source: { server: Server.HTTPS_LOCAL },
+  target: { server: Server.HTTPS_LOCAL },
+  expected: TestResult.SUCCESS,
+}), "local to local: success.");
+
+promise_test(t => makeTest(t, {
+  source: { server: Server.HTTPS_PRIVATE },
+  target: {
+    server: Server.HTTPS_LOCAL,
+    behavior: { response: ResponseBehavior.allowCrossOrigin() },
+  },
+  expected: TestResult.SUCCESS,
+}), "private to local: success.");
+
+promise_test(t => makeTest(t, {
+  source: { server: Server.HTTPS_PRIVATE },
+  target: { server: Server.HTTPS_PRIVATE },
+  expected: TestResult.SUCCESS,
+}), "private to private: success.");
+
+promise_test(t => makeTest(t, {
+  source: { server: Server.HTTPS_PUBLIC },
+  target: {
+    server: Server.HTTPS_LOCAL,
+    behavior: { response: ResponseBehavior.allowCrossOrigin() },
+  },
+  expected: TestResult.SUCCESS,
+}), "public to local: success.");
+
+promise_test(t => makeTest(t, {
+  source: { server: Server.HTTPS_PUBLIC },
+  target: {
+    server: Server.HTTPS_PRIVATE,
+    behavior: { response: ResponseBehavior.allowCrossOrigin() },
+  },
+  expected: TestResult.SUCCESS,
+}), "public to private: success.");
+
+promise_test(t => makeTest(t, {
+  source: { server: Server.HTTPS_PUBLIC },
+  target: { server: Server.HTTPS_PUBLIC },
+  expected: TestResult.SUCCESS,
+}), "public to public: success.");
+
+promise_test(t => makeTest(t, {
+  source: {
+    server: Server.HTTPS_LOCAL,
+    treatAsPublic: true,
+  },
+  target: { server: Server.HTTPS_LOCAL },
+  expected: TestResult.SUCCESS,
+}), "treat-as-public to local: success.");
+
+promise_test(t => makeTest(t, {
+  source: {
+    server: Server.HTTPS_LOCAL,
+    treatAsPublic: true,
+  },
+  target: {
+    server: Server.HTTPS_PRIVATE,
+    behavior: { response: ResponseBehavior.allowCrossOrigin() },
+  },
+  expected: TestResult.SUCCESS,
+}), "treat-as-public to private: success.");
+
+promise_test(t => makeTest(t, {
+  source: {
+    server: Server.HTTPS_LOCAL,
+    treatAsPublic: true,
+  },
+  target: {
+    server: Server.HTTPS_PUBLIC,
+    behavior: { response: ResponseBehavior.allowCrossOrigin() },
+  },
+  expected: TestResult.SUCCESS,
+}), "treat-as-public to public: success.");
diff --git a/test/wpt/tests/fetch/private-network-access/service-worker-fetch.https.window.js b/test/wpt/tests/fetch/private-network-access/service-worker-fetch.https.window.js
new file mode 100644
index 00000000000..5645d784561
--- /dev/null
+++ b/test/wpt/tests/fetch/private-network-access/service-worker-fetch.https.window.js
@@ -0,0 +1,217 @@
+// META: script=/common/utils.js
+// META: script=resources/support.sub.js
+//
+// Spec: https://wicg.github.io/private-network-access/#integration-fetch
+//
+// These tests check that fetches from within `ServiceWorker` scripts are
+// subject to Private Network Access checks, just like fetches from within
+// documents.
+
+// Results that may be expected in tests.
+const TestResult = {
+  SUCCESS: { ok: true, body: "success" },
+  FAILURE: { error: "TypeError" },
+};
+
+async function makeTest(t, { source, target, expected }) {
+  const bridgeUrl = resolveUrl(
+      "resources/service-worker-bridge.html",
+      sourceResolveOptions({ server: source.server }));
+
+  const scriptUrl =
+      resolveUrl("resources/service-worker.js", sourceResolveOptions(source));
+
+  const realTargetUrl = preflightUrl(target);
+
+  // Fetch a URL within the service worker's scope, but tell it which URL to
+  // really fetch.
+  const targetUrl = new URL("service-worker-proxy", scriptUrl);
+  targetUrl.searchParams.append("proxied-url", realTargetUrl.href);
+
+  const iframe = await appendIframe(t, document, bridgeUrl);
+
+  const request = (message) => {
+    const reply = futureMessage();
+    iframe.contentWindow.postMessage(message, "*");
+    return reply;
+  };
+
+  {
+    const { error, loaded } = await request({
+      action: "register",
+      url: scriptUrl.href,
+    });
+
+    assert_equals(error, undefined, "register error");
+    assert_true(loaded, "response loaded");
+  }
+
+  try {
+    const { controlled, numControllerChanges } = await request({
+      action: "wait",
+      numControllerChanges: 1,
+    });
+
+    assert_equals(numControllerChanges, 1, "controller change");
+    assert_true(controlled, "bridge script is controlled");
+
+    const { error, ok, body } = await request({
+      action: "fetch",
+      url: targetUrl.href,
+    });
+
+    assert_equals(error, expected.error, "fetch error");
+    assert_equals(ok, expected.ok, "response ok");
+    assert_equals(body, expected.body, "response body");
+  } finally {
+    // Always unregister the service worker.
+    const { error, unregistered } = await request({
+      action: "unregister",
+      scope: new URL("./", scriptUrl).href,
+    });
+
+    assert_equals(error, undefined, "unregister error");
+    assert_true(unregistered, "unregistered");
+  }
+}
+
+promise_test(t => makeTest(t, {
+  source: { server: Server.HTTPS_LOCAL },
+  target: { server: Server.HTTPS_LOCAL },
+  expected: TestResult.SUCCESS,
+}), "local to local: success.");
+
+promise_test(t => makeTest(t, {
+  source: { server: Server.HTTPS_PRIVATE },
+  target: {
+    server: Server.HTTPS_LOCAL,
+    behavior: { response: ResponseBehavior.allowCrossOrigin() },
+  },
+  expected: TestResult.FAILURE,
+}), "private to local: failed preflight.");
+
+promise_test(t => makeTest(t, {
+  source: { server: Server.HTTPS_PRIVATE },
+  target: {
+    server: Server.HTTPS_LOCAL,
+    behavior: {
+      preflight: PreflightBehavior.success(token()),
+      response: ResponseBehavior.allowCrossOrigin(),
+    },
+  },
+  expected: TestResult.SUCCESS,
+}), "private to local: success.");
+
+promise_test(t => makeTest(t, {
+  source: { server: Server.HTTPS_PRIVATE },
+  target: { server: Server.HTTPS_PRIVATE },
+  expected: TestResult.SUCCESS,
+}), "private to private: success.");
+
+promise_test(t => makeTest(t, {
+  source: { server: Server.HTTPS_PUBLIC },
+  target: {
+    server: Server.HTTPS_LOCAL,
+    behavior: { response: ResponseBehavior.allowCrossOrigin() },
+  },
+  expected: TestResult.FAILURE,
+}), "public to local: failed preflight.");
+
+promise_test(t => makeTest(t, {
+  source: { server: Server.HTTPS_PUBLIC },
+  target: {
+    server: Server.HTTPS_LOCAL,
+    behavior: {
+      preflight: PreflightBehavior.success(token()),
+      response: ResponseBehavior.allowCrossOrigin(),
+    },
+  },
+  expected: TestResult.SUCCESS,
+}), "public to local: success.");
+
+promise_test(t => makeTest(t, {
+  source: { server: Server.HTTPS_PUBLIC },
+  target: {
+    server: Server.HTTPS_PRIVATE,
+    behavior: { response: ResponseBehavior.allowCrossOrigin() },
+  },
+  expected: TestResult.FAILURE,
+}), "public to private: failed preflight.");
+
+promise_test(t => makeTest(t, {
+  source: { server: Server.HTTPS_PUBLIC },
+  target: {
+    server: Server.HTTPS_PRIVATE,
+    behavior: {
+      preflight: PreflightBehavior.success(token()),
+      response: ResponseBehavior.allowCrossOrigin(),
+    },
+  },
+  expected: TestResult.SUCCESS,
+}), "public to private: success.");
+
+promise_test(t => makeTest(t, {
+  source: { server: Server.HTTPS_PUBLIC },
+  target: { server: Server.HTTPS_PUBLIC },
+  expected: TestResult.SUCCESS,
+}), "public to public: success.");
+
+promise_test(t => makeTest(t, {
+  source: {
+    server: Server.HTTPS_LOCAL,
+    treatAsPublic: true,
+  },
+  target: { server: Server.HTTPS_LOCAL },
+  expected: TestResult.FAILURE,
+}), "treat-as-public to local: failed preflight.");
+
+promise_test(t => makeTest(t, {
+  source: {
+    server: Server.HTTPS_LOCAL,
+    treatAsPublic: true,
+  },
+  target: {
+    server: Server.HTTPS_LOCAL,
+    behavior: { preflight: PreflightBehavior.success(token()) },
+  },
+  expected: TestResult.SUCCESS,
+}), "treat-as-public to local: success.");
+
+promise_test(t => makeTest(t, {
+  source: {
+    server: Server.HTTPS_LOCAL,
+    treatAsPublic: true,
+  },
+  target: {
+    server: Server.HTTPS_PRIVATE,
+    behavior: { response: ResponseBehavior.allowCrossOrigin() },
+  },
+  expected: TestResult.FAILURE,
+}), "treat-as-public to private: failed preflight.");
+
+promise_test(t => makeTest(t, {
+  source: {
+    server: Server.HTTPS_LOCAL,
+    treatAsPublic: true,
+  },
+  target: {
+    server: Server.HTTPS_PRIVATE,
+    behavior: {
+      preflight: PreflightBehavior.success(token()),
+      response: ResponseBehavior.allowCrossOrigin(),
+    },
+  },
+  expected: TestResult.SUCCESS,
+}), "treat-as-public to private: success.");
+
+promise_test(t => makeTest(t, {
+  source: {
+    server: Server.HTTPS_LOCAL,
+    treatAsPublic: true,
+  },
+  target: {
+    server: Server.HTTPS_PUBLIC,
+    behavior: { response: ResponseBehavior.allowCrossOrigin() },
+  },
+  expected: TestResult.SUCCESS,
+}), "treat-as-public to public: success.");
diff --git a/test/wpt/tests/fetch/private-network-access/service-worker-update.https.window.js b/test/wpt/tests/fetch/private-network-access/service-worker-update.https.window.js
new file mode 100644
index 00000000000..fe2bf58f660
--- /dev/null
+++ b/test/wpt/tests/fetch/private-network-access/service-worker-update.https.window.js
@@ -0,0 +1,121 @@
+// META: script=/common/utils.js
+// META: script=resources/support.sub.js
+//
+// Spec: https://wicg.github.io/private-network-access/#integration-fetch
+//
+// These tests check that `ServiceWorker` script update fetches are subject to
+// Private Network Access checks, just like regular `fetch()` calls. The client
+// of the fetch, for PNA purposes, is taken to be the previous script.
+//
+// The tests is carried out by instantiating a service worker from a resource
+// that carries the `Content-Security-Policy: treat-as-public-address` header,
+// such that the registration is placed in the public IP address space. When
+// the script is fetched for an update, the client is thus considered public,
+// yet the same-origin fetch observes that the server's IP endpoint is not
+// necessarily in the public IP address space.
+//
+// See also: worker.https.window.js
+
+// Results that may be expected in tests.
+const TestResult = {
+  SUCCESS: { updated: true },
+  FAILURE: { error: "TypeError" },
+};
+
+async function makeTest(t, { target, expected }) {
+  // The bridge must be same-origin with the service worker script.
+  const bridgeUrl = resolveUrl(
+      "resources/service-worker-bridge.html",
+      sourceResolveOptions({ server: target.server }));
+
+  const scriptUrl = preflightUrl(target);
+  scriptUrl.searchParams.append("treat-as-public-once", token());
+  scriptUrl.searchParams.append("mime-type", "application/javascript");
+  scriptUrl.searchParams.append("file", "service-worker.js");
+  scriptUrl.searchParams.append("random-js-prefix", true);
+
+  const iframe = await appendIframe(t, document, bridgeUrl);
+
+  const request = (message) => {
+    const reply = futureMessage();
+    iframe.contentWindow.postMessage(message, "*");
+    return reply;
+  };
+
+  {
+    const { error, loaded } = await request({
+      action: "register",
+      url: scriptUrl.href,
+    });
+
+    assert_equals(error, undefined, "register error");
+    assert_true(loaded, "response loaded");
+  }
+
+  try {
+    let { controlled, numControllerChanges } = await request({
+      action: "wait",
+      numControllerChanges: 1,
+    });
+
+    assert_equals(numControllerChanges, 1, "controller change");
+    assert_true(controlled, "bridge script is controlled");
+
+    const { error, updated } = await request({ action: "update" });
+
+    assert_equals(error, expected.error, "update error");
+    assert_equals(updated, expected.updated, "registration updated");
+
+    // Stop here if we do not expect the update to succeed.
+    if (!expected.updated) {
+      return;
+    }
+
+    ({ controlled, numControllerChanges } = await request({
+      action: "wait",
+      numControllerChanges: 2,
+    }));
+
+    assert_equals(numControllerChanges, 2, "controller change");
+    assert_true(controlled, "bridge script still controlled");
+  } finally {
+    const { error, unregistered } = await request({
+      action: "unregister",
+      scope: new URL("./", scriptUrl).href,
+    });
+
+    assert_equals(error, undefined, "unregister error");
+    assert_true(unregistered, "unregistered");
+  }
+}
+
+promise_test(t => makeTest(t, {
+  target: { server: Server.HTTPS_LOCAL },
+  expected: TestResult.FAILURE,
+}), "update public to local: failed preflight.");
+
+promise_test(t => makeTest(t, {
+  target: {
+    server: Server.HTTPS_LOCAL,
+    behavior: { preflight: PreflightBehavior.serviceWorkerSuccess(token()) },
+  },
+  expected: TestResult.SUCCESS,
+}), "update public to local: success.");
+
+promise_test(t => makeTest(t, {
+  target: { server: Server.HTTPS_PRIVATE },
+  expected: TestResult.FAILURE,
+}), "update public to private: failed preflight.");
+
+promise_test(t => makeTest(t, {
+  target: {
+    server: Server.HTTPS_PRIVATE,
+    behavior: { preflight: PreflightBehavior.serviceWorkerSuccess(token()) },
+  },
+  expected: TestResult.SUCCESS,
+}), "update public to private: success.");
+
+promise_test(t => makeTest(t, {
+  target: { server: Server.HTTPS_PUBLIC },
+  expected: TestResult.SUCCESS,
+}), "update public to public: success.");
diff --git a/test/wpt/tests/fetch/private-network-access/service-worker.https.window.js b/test/wpt/tests/fetch/private-network-access/service-worker.https.window.js
new file mode 100644
index 00000000000..8dc631f65a8
--- /dev/null
+++ b/test/wpt/tests/fetch/private-network-access/service-worker.https.window.js
@@ -0,0 +1,107 @@
+// META: script=/common/utils.js
+// META: script=resources/support.sub.js
+//
+// Spec: https://wicg.github.io/private-network-access/#integration-fetch
+//
+// These tests check that initial `ServiceWorker` script fetches are subject to
+// Private Network Access checks, just like a regular `fetch()`.
+//
+// See also: worker.https.window.js
+
+// Results that may be expected in tests.
+const TestResult = {
+  SUCCESS: {
+    register: { loaded: true },
+    unregister: { unregistered: true },
+  },
+  FAILURE: {
+    register: { error: "TypeError" },
+    unregister: { unregistered: false, error: "no registration" },
+  },
+};
+
+async function makeTest(t, { source, target, expected }) {
+  const sourceUrl = resolveUrl("resources/service-worker-bridge.html",
+                               sourceResolveOptions(source));
+
+  const targetUrl = preflightUrl(target);
+  targetUrl.searchParams.append("body", "undefined");
+  targetUrl.searchParams.append("mime-type", "application/javascript");
+
+  const scope = resolveUrl(`resources/${token()}`, {...target.server}).href;
+
+  const iframe = await appendIframe(t, document, sourceUrl);
+
+  {
+    const reply = futureMessage();
+    const message = {
+      action: "register",
+      url: targetUrl.href,
+      options: { scope },
+    };
+    iframe.contentWindow.postMessage(message, "*");
+
+    const { error, loaded } = await reply;
+
+    assert_equals(error, expected.register.error, "register error");
+    assert_equals(loaded, expected.register.loaded, "response loaded");
+  }
+
+  {
+    const reply = futureMessage();
+    iframe.contentWindow.postMessage({ action: "unregister", scope }, "*");
+
+    const { error, unregistered } = await reply;
+    assert_equals(error, expected.unregister.error, "unregister error");
+    assert_equals(
+        unregistered, expected.unregister.unregistered, "worker unregistered");
+  }
+}
+
+promise_test(t => makeTest(t, {
+  source: {
+    server: Server.HTTPS_LOCAL,
+    treatAsPublic: true,
+  },
+  target: { server: Server.HTTPS_LOCAL },
+  expected: TestResult.FAILURE,
+}), "treat-as-public to local: failed preflight.");
+
+promise_test(t => makeTest(t, {
+  source: {
+    server: Server.HTTPS_LOCAL,
+    treatAsPublic: true,
+  },
+  target: {
+    server: Server.HTTPS_LOCAL,
+    behavior: { preflight: PreflightBehavior.serviceWorkerSuccess(token()) },
+  },
+  expected: TestResult.SUCCESS,
+}), "treat-as-public to local: success.");
+
+promise_test(t => makeTest(t, {
+  source: {
+    server: Server.HTTPS_PRIVATE,
+    treatAsPublic: true,
+  },
+  target: { server: Server.HTTPS_PRIVATE },
+  expected: TestResult.FAILURE,
+}), "treat-as-public to private: failed preflight.");
+
+promise_test(t => makeTest(t, {
+  source: {
+    server: Server.HTTPS_PRIVATE,
+    treatAsPublic: true,
+  },
+  target: {
+    server: Server.HTTPS_PRIVATE,
+    behavior: { preflight: PreflightBehavior.serviceWorkerSuccess(token()) },
+  },
+  expected: TestResult.SUCCESS,
+}), "treat-as-public to private: success.");
+
+promise_test(t => makeTest(t, {
+  source: { server: Server.HTTPS_PUBLIC },
+  target: { server: Server.HTTPS_PUBLIC },
+  expected: TestResult.SUCCESS,
+}), "public to public: success.");
diff --git a/test/wpt/tests/fetch/private-network-access/shared-worker-blob-fetch.https.window.js b/test/wpt/tests/fetch/private-network-access/shared-worker-blob-fetch.https.window.js
new file mode 100644
index 00000000000..ad9cd09c31b
--- /dev/null
+++ b/test/wpt/tests/fetch/private-network-access/shared-worker-blob-fetch.https.window.js
@@ -0,0 +1,153 @@
+// META: script=/common/utils.js
+// META: script=resources/support.sub.js
+//
+// Spec: https://wicg.github.io/private-network-access/#integration-fetch
+//
+// These tests check that fetches from within `SharedWorker` scripts that are
+// loaded from blob URLs are subject to Private Network Access checks, just like
+// fetches from within documents.
+//
+// This file covers only those tests that must execute in a non-secure context.
+// Other tests are defined in: shared-worker-blob-fetch.https.window.js
+
+promise_test(t => sharedWorkerBlobFetchTest(t, {
+  source: { server: Server.HTTPS_LOCAL },
+  target: { server: Server.HTTPS_LOCAL },
+  expected: WorkerFetchTestResult.SUCCESS,
+}), "local to local: success.");
+
+promise_test(t => sharedWorkerBlobFetchTest(t, {
+  source: { server: Server.HTTPS_PRIVATE },
+  target: {
+    server: Server.HTTPS_LOCAL,
+    behavior: { response: ResponseBehavior.allowCrossOrigin() },
+  },
+  expected: WorkerFetchTestResult.FAILURE,
+}), "private to local: failed preflight.");
+
+promise_test(t => sharedWorkerBlobFetchTest(t, {
+  source: { server: Server.HTTPS_PRIVATE },
+  target: {
+    server: Server.HTTPS_LOCAL,
+    behavior: {
+      preflight: PreflightBehavior.success(token()),
+      response: ResponseBehavior.allowCrossOrigin(),
+    },
+  },
+  expected: WorkerFetchTestResult.SUCCESS,
+}), "private to local: success.");
+
+promise_test(t => sharedWorkerBlobFetchTest(t, {
+  source: { server: Server.HTTPS_PRIVATE },
+  target: { server: Server.HTTPS_PRIVATE },
+  expected: WorkerFetchTestResult.SUCCESS,
+}), "private to private: success.");
+
+promise_test(t => sharedWorkerBlobFetchTest(t, {
+  source: { server: Server.HTTPS_PUBLIC },
+  target: {
+    server: Server.HTTPS_LOCAL,
+    behavior: { response: ResponseBehavior.allowCrossOrigin() },
+  },
+  expected: WorkerFetchTestResult.FAILURE,
+}), "public to local: failed preflight.");
+
+promise_test(t => sharedWorkerBlobFetchTest(t, {
+  source: { server: Server.HTTPS_PUBLIC },
+  target: {
+    server: Server.HTTPS_LOCAL,
+    behavior: {
+      preflight: PreflightBehavior.success(token()),
+      response: ResponseBehavior.allowCrossOrigin(),
+    },
+  },
+  expected: WorkerFetchTestResult.SUCCESS,
+}), "public to local: success.");
+
+promise_test(t => sharedWorkerBlobFetchTest(t, {
+  source: { server: Server.HTTPS_PUBLIC },
+  target: {
+    server: Server.HTTPS_PRIVATE,
+    behavior: { response: ResponseBehavior.allowCrossOrigin() },
+  },
+  expected: WorkerFetchTestResult.FAILURE,
+}), "public to private: failed preflight.");
+
+promise_test(t => sharedWorkerBlobFetchTest(t, {
+  source: { server: Server.HTTPS_PUBLIC },
+  target: {
+    server: Server.HTTPS_PRIVATE,
+    behavior: {
+      preflight: PreflightBehavior.success(token()),
+      response: ResponseBehavior.allowCrossOrigin(),
+    },
+  },
+  expected: WorkerFetchTestResult.SUCCESS,
+}), "public to private: success.");
+
+promise_test(t => sharedWorkerBlobFetchTest(t, {
+  source: { server: Server.HTTPS_PUBLIC },
+  target: { server: Server.HTTPS_PUBLIC },
+  expected: WorkerFetchTestResult.SUCCESS,
+}), "public to public: success.");
+
+promise_test(t => sharedWorkerBlobFetchTest(t, {
+  source: {
+    server: Server.HTTPS_LOCAL,
+    treatAsPublic: true,
+  },
+  target: { server: Server.HTTPS_LOCAL },
+  expected: WorkerFetchTestResult.FAILURE,
+}), "treat-as-public to local: failed preflight.");
+
+promise_test(t => sharedWorkerBlobFetchTest(t, {
+  source: {
+    server: Server.HTTPS_LOCAL,
+    treatAsPublic: true,
+  },
+  target: {
+    server: Server.HTTPS_LOCAL,
+    behavior: { preflight: PreflightBehavior.success(token()) },
+  },
+  expected: WorkerFetchTestResult.SUCCESS,
+}), "treat-as-public to local: success.");
+
+promise_test(t => sharedWorkerBlobFetchTest(t, {
+  source: {
+    server: Server.HTTPS_LOCAL,
+    treatAsPublic: true,
+  },
+  target: {
+    server: Server.HTTPS_PRIVATE,
+    behavior: { response: ResponseBehavior.allowCrossOrigin() },
+  },
+  expected: WorkerFetchTestResult.FAILURE,
+}), "treat-as-public to private: failed preflight.");
+
+promise_test(t => sharedWorkerBlobFetchTest(t, {
+  source: {
+    server: Server.HTTPS_LOCAL,
+    treatAsPublic: true,
+  },
+  target: {
+    server: Server.HTTPS_PRIVATE,
+    behavior: {
+      preflight: PreflightBehavior.success(token()),
+      response: ResponseBehavior.allowCrossOrigin(),
+    },
+  },
+  expected: WorkerFetchTestResult.SUCCESS,
+}), "treat-as-public to private: success.");
+
+promise_test(t => sharedWorkerBlobFetchTest(t, {
+  source: {
+    server: Server.HTTPS_LOCAL,
+    treatAsPublic: true,
+  },
+  target: {
+    server: Server.HTTPS_PUBLIC,
+    behavior: { response: ResponseBehavior.allowCrossOrigin() },
+  },
+  expected: WorkerFetchTestResult.SUCCESS,
+}), "treat-as-public to public: success.");
+
diff --git a/test/wpt/tests/fetch/private-network-access/shared-worker-blob-fetch.window.js b/test/wpt/tests/fetch/private-network-access/shared-worker-blob-fetch.window.js
new file mode 100644
index 00000000000..d430ea73837
--- /dev/null
+++ b/test/wpt/tests/fetch/private-network-access/shared-worker-blob-fetch.window.js
@@ -0,0 +1,173 @@
+// META: script=/common/utils.js
+// META: script=resources/support.sub.js
+//
+// Spec: https://wicg.github.io/private-network-access/#integration-fetch
+//
+// These tests check that fetches from within `SharedWorker` scripts that are
+// loaded from blob URLs are subject to Private Network Access checks, just like
+// fetches from within documents.
+//
+// This file covers only those tests that must execute in a non-secure context.
+// Other tests are defined in: shared-worker-blob-fetch.https.window.js
+
+promise_test(t => sharedWorkerBlobFetchTest(t, {
+  source: { server: Server.HTTP_LOCAL },
+  target: { server: Server.HTTP_LOCAL },
+  expected: WorkerFetchTestResult.SUCCESS,
+}), "local to local: success.");
+
+promise_test(t => sharedWorkerBlobFetchTest(t, {
+  source: { server: Server.HTTP_PRIVATE },
+  target: {
+    server: Server.HTTP_LOCAL,
+    behavior: {
+      preflight: PreflightBehavior.optionalSuccess(token()),
+      response: ResponseBehavior.allowCrossOrigin(),
+    },
+  },
+  expected: WorkerFetchTestResult.FAILURE,
+}), "private to local: failure.");
+
+promise_test(t => sharedWorkerBlobFetchTest(t, {
+  source: { server: Server.HTTP_PRIVATE },
+  target: { server: Server.HTTP_PRIVATE },
+  expected: WorkerFetchTestResult.SUCCESS,
+}), "private to private: success.");
+
+promise_test(t => sharedWorkerBlobFetchTest(t, {
+  source: { server: Server.HTTP_PUBLIC },
+  target: {
+    server: Server.HTTP_LOCAL,
+    behavior: {
+      preflight: PreflightBehavior.optionalSuccess(token()),
+      response: ResponseBehavior.allowCrossOrigin(),
+    },
+  },
+  expected: WorkerFetchTestResult.FAILURE,
+}), "public to local: failure.");
+
+promise_test(t => sharedWorkerBlobFetchTest(t, {
+  source: { server: Server.HTTP_PUBLIC },
+  target: {
+    server: Server.HTTP_PRIVATE,
+    behavior: {
+      preflight: PreflightBehavior.optionalSuccess(token()),
+      response: ResponseBehavior.allowCrossOrigin(),
+    },
+  },
+  expected: WorkerFetchTestResult.FAILURE,
+}), "public to private: failure.");
+
+promise_test(t => sharedWorkerBlobFetchTest(t, {
+  source: { server: Server.HTTP_PUBLIC },
+  target: { server: Server.HTTP_PUBLIC },
+  expected: WorkerFetchTestResult.SUCCESS,
+}), "public to public: success.");
+
+promise_test(t => sharedWorkerBlobFetchTest(t, {
+  source: {
+    server: Server.HTTP_LOCAL,
+    treatAsPublic: true,
+  },
+  target: {
+    server: Server.HTTP_LOCAL,
+    behavior: { preflight: PreflightBehavior.optionalSuccess(token()) },
+  },
+  expected: WorkerFetchTestResult.FAILURE,
+}), "treat-as-public to local: failure.");
+
+promise_test(t => sharedWorkerBlobFetchTest(t, {
+  source: {
+    server: Server.HTTP_LOCAL,
+    treatAsPublic: true,
+  },
+  target: {
+    server: Server.HTTP_PRIVATE,
+    behavior: {
+      preflight: PreflightBehavior.optionalSuccess(token()),
+      response: ResponseBehavior.allowCrossOrigin(),
+    },
+  },
+  expected: WorkerFetchTestResult.FAILURE,
+}), "treat-as-public to private: failure.");
+
+promise_test(t => sharedWorkerBlobFetchTest(t, {
+  source: {
+    server: Server.HTTP_LOCAL,
+    treatAsPublic: true,
+  },
+  target: {
+    server: Server.HTTP_PUBLIC,
+    behavior: { response: ResponseBehavior.allowCrossOrigin() },
+  },
+  expected: WorkerFetchTestResult.SUCCESS,
+}), "treat-as-public to public: success.");
+
+// The following tests verify that workers served over HTTPS are not allowed to
+// make private network requests because they are not secure contexts.
+
+promise_test(t => sharedWorkerBlobFetchTest(t, {
+  source: { server: Server.HTTPS_LOCAL },
+  target: {
+    server: Server.HTTP_LOCAL,
+    behavior: { response: ResponseBehavior.allowCrossOrigin() },
+  },
+  expected: WorkerFetchTestResult.SUCCESS,
+}), "local https to local: success.");
+
+promise_test(t => sharedWorkerBlobFetchTest(t, {
+  source: { server: Server.HTTPS_PUBLIC },
+  target: {
+    server: Server.HTTP_LOCAL,
+    behavior: {
+      preflight: PreflightBehavior.optionalSuccess(token()),
+      response: ResponseBehavior.allowCrossOrigin(),
+    },
+  },
+  expected: WorkerFetchTestResult.FAILURE,
+}), "private https to local: failure.");
+
+promise_test(t => sharedWorkerBlobFetchTest(t, {
+  source: { server: Server.HTTPS_PUBLIC },
+  target: {
+    server: Server.HTTP_LOCAL,
+    behavior: {
+      preflight: PreflightBehavior.optionalSuccess(token()),
+      response: ResponseBehavior.allowCrossOrigin(),
+    },
+  },
+  expected: WorkerFetchTestResult.FAILURE,
+}), "public https to local: failure.");
+
+promise_test(t => sharedWorkerBlobFetchTest(t, {
+  source: { server: Server.HTTPS_LOCAL },
+  target: {
+    server: Server.HTTPS_LOCAL,
+    behavior: { response: ResponseBehavior.allowCrossOrigin() },
+  },
+  expected: WorkerFetchTestResult.SUCCESS,
+}), "local https to local https: success.");
+
+promise_test(t => sharedWorkerBlobFetchTest(t, {
+  source: { server: Server.HTTPS_PRIVATE },
+  target: {
+    server: Server.HTTPS_LOCAL,
+    behavior: {
+      preflight: PreflightBehavior.optionalSuccess(token()),
+      response: ResponseBehavior.allowCrossOrigin(),
+    },
+  },
+  expected: WorkerFetchTestResult.FAILURE,
+}), "private https to local https: failure.");
+
+promise_test(t => sharedWorkerBlobFetchTest(t, {
+  source: { server: Server.HTTPS_PUBLIC },
+  target: {
+    server: Server.HTTPS_LOCAL,
+    behavior: {
+      preflight: PreflightBehavior.optionalSuccess(token()),
+      response: ResponseBehavior.allowCrossOrigin(),
+    },
+  },
+  expected: WorkerFetchTestResult.FAILURE,
+}), "public https to local https: failure.");
diff --git a/test/wpt/tests/fetch/private-network-access/shared-worker-fetch.https.window.js b/test/wpt/tests/fetch/private-network-access/shared-worker-fetch.https.window.js
new file mode 100644
index 00000000000..7066b359caa
--- /dev/null
+++ b/test/wpt/tests/fetch/private-network-access/shared-worker-fetch.https.window.js
@@ -0,0 +1,152 @@
+// META: script=/common/utils.js
+// META: script=resources/support.sub.js
+//
+// Spec: https://wicg.github.io/private-network-access/#integration-fetch
+//
+// These tests check that fetches from within `SharedWorker` scripts are subject
+// to Private Network Access checks, just like fetches from within documents.
+//
+// This file covers only those tests that must execute in a secure context.
+// Other tests are defined in: shared-worker-fetch.window.js
+
+promise_test(t => sharedWorkerFetchTest(t, {
+  source: { server: Server.HTTPS_LOCAL },
+  target: { server: Server.HTTPS_LOCAL },
+  expected: WorkerFetchTestResult.SUCCESS,
+}), "local to local: success.");
+
+promise_test(t => sharedWorkerFetchTest(t, {
+  source: { server: Server.HTTPS_PRIVATE },
+  target: {
+    server: Server.HTTPS_LOCAL,
+    behavior: { response: ResponseBehavior.allowCrossOrigin() },
+  },
+  expected: WorkerFetchTestResult.FAILURE,
+}), "private to local: failure.");
+
+promise_test(t => sharedWorkerFetchTest(t, {
+  source: { server: Server.HTTPS_PRIVATE },
+  target: {
+    server: Server.HTTPS_LOCAL,
+    behavior: {
+      preflight: PreflightBehavior.success(token()),
+      response: ResponseBehavior.allowCrossOrigin(),
+    },
+  },
+  expected: WorkerFetchTestResult.SUCCESS,
+}), "private to local: success.");
+
+promise_test(t => sharedWorkerFetchTest(t, {
+  source: { server: Server.HTTPS_PRIVATE },
+  target: { server: Server.HTTPS_PRIVATE },
+  expected: WorkerFetchTestResult.SUCCESS,
+}), "private to private: success.");
+
+promise_test(t => sharedWorkerFetchTest(t, {
+  source: { server: Server.HTTPS_PUBLIC },
+  target: {
+    server: Server.HTTPS_LOCAL,
+    behavior: { response: ResponseBehavior.allowCrossOrigin() },
+  },
+  expected: WorkerFetchTestResult.FAILURE,
+}), "public to local: failed preflight.");
+
+promise_test(t => sharedWorkerFetchTest(t, {
+  source: { server: Server.HTTPS_PUBLIC },
+  target: {
+    server: Server.HTTPS_LOCAL,
+    behavior: {
+      preflight: PreflightBehavior.success(token()),
+      response: ResponseBehavior.allowCrossOrigin(),
+    },
+  },
+  expected: WorkerFetchTestResult.SUCCESS,
+}), "public to local: success.");
+
+promise_test(t => sharedWorkerFetchTest(t, {
+  source: { server: Server.HTTPS_PUBLIC },
+  target: {
+    server: Server.HTTPS_PRIVATE,
+    behavior: { response: ResponseBehavior.allowCrossOrigin() },
+  },
+  expected: WorkerFetchTestResult.FAILURE,
+}), "public to private: failed preflight.");
+
+promise_test(t => sharedWorkerFetchTest(t, {
+  source: { server: Server.HTTPS_PUBLIC },
+  target: {
+    server: Server.HTTPS_PRIVATE,
+    behavior: {
+      preflight: PreflightBehavior.success(token()),
+      response: ResponseBehavior.allowCrossOrigin(),
+    },
+  },
+  expected: WorkerFetchTestResult.SUCCESS,
+}), "public to private: success.");
+
+promise_test(t => sharedWorkerFetchTest(t, {
+  source: { server: Server.HTTPS_PUBLIC },
+  target: { server: Server.HTTPS_PUBLIC },
+  expected: WorkerFetchTestResult.SUCCESS,
+}), "public to public: success.");
+
+promise_test(t => sharedWorkerFetchTest(t, {
+  source: {
+    server: Server.HTTPS_LOCAL,
+    treatAsPublic: true,
+  },
+  target: { server: Server.HTTPS_LOCAL },
+  expected: WorkerFetchTestResult.FAILURE,
+}), "treat-as-public to local: failed preflight.");
+
+promise_test(t => sharedWorkerFetchTest(t, {
+  source: {
+    server: Server.HTTPS_LOCAL,
+    treatAsPublic: true,
+  },
+  target: {
+    server: Server.HTTPS_LOCAL,
+    behavior: { preflight: PreflightBehavior.optionalSuccess(token()) },
+  },
+  expected: WorkerFetchTestResult.SUCCESS,
+}), "treat-as-public to local: success.");
+
+promise_test(t => sharedWorkerFetchTest(t, {
+  source: {
+    server: Server.HTTPS_LOCAL,
+    treatAsPublic: true,
+  },
+  target: {
+    server: Server.HTTPS_PRIVATE,
+    behavior: { response: ResponseBehavior.allowCrossOrigin() },
+  },
+  expected: WorkerFetchTestResult.FAILURE,
+}), "treat-as-public to private: failed preflight.");
+
+promise_test(t => sharedWorkerFetchTest(t, {
+  source: {
+    server: Server.HTTPS_LOCAL,
+    treatAsPublic: true,
+  },
+  target: {
+    server: Server.HTTPS_PRIVATE,
+    behavior: {
+      preflight: PreflightBehavior.success(token()),
+      response: ResponseBehavior.allowCrossOrigin(),
+    },
+  },
+  expected: WorkerFetchTestResult.SUCCESS,
+}), "treat-as-public to private: success.");
+
+promise_test(t => sharedWorkerFetchTest(t, {
+  source: {
+    server: Server.HTTPS_LOCAL,
+    treatAsPublic: true,
+  },
+  target: {
+    server: Server.HTTPS_PUBLIC,
+    behavior: { response: ResponseBehavior.allowCrossOrigin() },
+  },
+  expected: WorkerFetchTestResult.SUCCESS,
+}), "treat-as-public to public: success.");
+
diff --git a/test/wpt/tests/fetch/private-network-access/shared-worker-fetch.window.js b/test/wpt/tests/fetch/private-network-access/shared-worker-fetch.window.js
new file mode 100644
index 00000000000..9bc1a89bead
--- /dev/null
+++ b/test/wpt/tests/fetch/private-network-access/shared-worker-fetch.window.js
@@ -0,0 +1,154 @@
+// META: script=/common/utils.js
+// META: script=resources/support.sub.js
+//
+// Spec: https://wicg.github.io/private-network-access/#integration-fetch
+//
+// These tests check that fetches from within `SharedWorker` scripts are subject
+// to Private Network Access checks, just like fetches from within documents.
+//
+// This file covers only those tests that must execute in a non-secure context.
+// Other tests are defined in: shared-worker-fetch.https.window.js
+
+promise_test(t => sharedWorkerFetchTest(t, {
+  source: { server: Server.HTTP_LOCAL },
+  target: { server: Server.HTTP_LOCAL },
+  expected: WorkerFetchTestResult.SUCCESS,
+}), "local to local: success.");
+
+promise_test(t => sharedWorkerFetchTest(t, {
+  source: { server: Server.HTTP_PRIVATE },
+  target: {
+    server: Server.HTTP_LOCAL,
+    behavior: {
+      preflight: PreflightBehavior.optionalSuccess(token()),
+      response: ResponseBehavior.allowCrossOrigin(),
+    },
+  },
+  expected: WorkerFetchTestResult.FAILURE,
+}), "private to local: failure.");
+
+promise_test(t => sharedWorkerFetchTest(t, {
+  source: { server: Server.HTTP_PRIVATE },
+  target: { server: Server.HTTP_PRIVATE },
+  expected: WorkerFetchTestResult.SUCCESS,
+}), "private to private: success.");
+
+promise_test(t => sharedWorkerFetchTest(t, {
+  source: { server: Server.HTTP_PUBLIC },
+  target: {
+    server: Server.HTTP_LOCAL,
+    behavior: {
+      preflight: PreflightBehavior.optionalSuccess(token()),
+      response: ResponseBehavior.allowCrossOrigin(),
+    },
+  },
+  expected: WorkerFetchTestResult.FAILURE,
+}), "public to local: failure.");
+
+promise_test(t => sharedWorkerFetchTest(t, {
+  source: { server: Server.HTTP_PUBLIC },
+  target: {
+    server: Server.HTTP_PRIVATE,
+    behavior: {
+      preflight: PreflightBehavior.optionalSuccess(token()),
+      response: ResponseBehavior.allowCrossOrigin(),
+    },
+  },
+  expected: WorkerFetchTestResult.FAILURE,
+}), "public to private: failure.");
+
+promise_test(t => sharedWorkerFetchTest(t, {
+  source: { server: Server.HTTP_PUBLIC },
+  target: { server: Server.HTTP_PUBLIC },
+  expected: WorkerFetchTestResult.SUCCESS,
+}), "public to public: success.");
+
+promise_test(t => sharedWorkerFetchTest(t, {
+  source: {
+    server: Server.HTTP_LOCAL,
+    treatAsPublic: true,
+  },
+  target: {
+    server: Server.HTTP_LOCAL,
+    behavior: { preflight: PreflightBehavior.optionalSuccess(token()) },
+  },
+  expected: WorkerFetchTestResult.FAILURE,
+}), "treat-as-public to local: failure.");
+
+promise_test(t => sharedWorkerFetchTest(t, {
+  source: {
+    server: Server.HTTP_LOCAL,
+    treatAsPublic: true,
+  },
+  target: {
+    server: Server.HTTP_PRIVATE,
+    behavior: {
+      preflight: PreflightBehavior.optionalSuccess(token()),
+      response: ResponseBehavior.allowCrossOrigin(),
+    },
+  },
+  expected: WorkerFetchTestResult.FAILURE,
+}), "treat-as-public to private: failure.");
+
+promise_test(t => sharedWorkerFetchTest(t, {
+  source: {
+    server: Server.HTTP_LOCAL,
+    treatAsPublic: true,
+  },
+  target: {
+    server: Server.HTTP_PUBLIC,
+    behavior: { response: ResponseBehavior.allowCrossOrigin() },
+  },
+  expected: WorkerFetchTestResult.SUCCESS,
+}), "treat-as-public to public: success.");
+
+// The following tests verify that workers served over HTTPS are not allowed to
+// make private network requests because they are not secure contexts.
+
+promise_test(t => sharedWorkerFetchTest(t, {
+  source: { server: Server.HTTPS_LOCAL },
+  target: {
+    server: Server.HTTP_LOCAL,
+    behavior: {
+      preflight: PreflightBehavior.optionalSuccess(token()),
+      response: ResponseBehavior.allowCrossOrigin(),
+    },
+  },
+  expected: WorkerFetchTestResult.SUCCESS,
+}), "local https to local: success.");
+
+promise_test(t => sharedWorkerFetchTest(t, {
+  source: { server: Server.HTTPS_PRIVATE },
+  target: {
+    server: Server.HTTP_LOCAL,
+    behavior: {
+      preflight: PreflightBehavior.optionalSuccess(token()),
+      response: ResponseBehavior.allowCrossOrigin(),
+    },
+  },
+  expected: WorkerFetchTestResult.FAILURE,
+}), "private https to local: failure.");
+
+promise_test(t => sharedWorkerFetchTest(t, {
+  source: { server: Server.HTTPS_PUBLIC },
+  target: {
+    server: Server.HTTP_LOCAL,
+    behavior: {
+      preflight: PreflightBehavior.optionalSuccess(token()),
+      response: ResponseBehavior.allowCrossOrigin(),
+    },
+  },
+  expected: WorkerFetchTestResult.FAILURE,
+}), "public https to local: failure.");
+
+promise_test(t => sharedWorkerFetchTest(t, {
+  source: { server: Server.HTTPS_PUBLIC },
+  target: {
+    server: Server.HTTP_PRIVATE,
+    behavior: {
+      preflight: PreflightBehavior.optionalSuccess(token()),
+      response: ResponseBehavior.allowCrossOrigin(),
+    },
+  },
+  expected: WorkerFetchTestResult.FAILURE,
+}), "public https to private: failure.");
diff --git a/test/wpt/tests/fetch/private-network-access/shared-worker.https.window.js b/test/wpt/tests/fetch/private-network-access/shared-worker.https.window.js
new file mode 100644
index 00000000000..ecb70c41245
--- /dev/null
+++ b/test/wpt/tests/fetch/private-network-access/shared-worker.https.window.js
@@ -0,0 +1,58 @@
+// META: script=/common/utils.js
+// META: script=resources/support.sub.js
+//
+// Spec: https://wicg.github.io/private-network-access/#integration-fetch
+//
+// These tests mirror `Worker` tests, except using `SharedWorker`.
+// See also: worker.https.window.js
+//
+// This file covers only those tests that must execute in a secure context.
+// Other tests are defined in: shared-worker.window.js
+
+promise_test(t => sharedWorkerScriptTest(t, {
+  source: {
+    server: Server.HTTPS_LOCAL,
+    treatAsPublic: true,
+  },
+  target: { server: Server.HTTPS_LOCAL },
+  expected: WorkerScriptTestResult.FAILURE,
+}), "treat-as-public to local: failed preflight.");
+
+promise_test(t => sharedWorkerScriptTest(t, {
+  source: {
+    server: Server.HTTPS_LOCAL,
+    treatAsPublic: true,
+  },
+  target: {
+    server: Server.HTTPS_LOCAL,
+    behavior: { preflight: PreflightBehavior.optionalSuccess(token()) },
+  },
+  expected: WorkerScriptTestResult.SUCCESS,
+}), "treat-as-public to local: success.");
+
+promise_test(t => sharedWorkerScriptTest(t, {
+  source: {
+    server: Server.HTTPS_PRIVATE,
+    treatAsPublic: true,
+  },
+  target: { server: Server.HTTPS_PRIVATE },
+  expected: WorkerScriptTestResult.FAILURE,
+}), "treat-as-public to private: failed preflight.");
+
+promise_test(t => sharedWorkerScriptTest(t, {
+  source: {
+    server: Server.HTTPS_PRIVATE,
+    treatAsPublic: true,
+  },
+  target: {
+    server: Server.HTTPS_PRIVATE,
+    behavior: { preflight: PreflightBehavior.optionalSuccess(token()) },
+  },
+  expected: WorkerScriptTestResult.SUCCESS,
+}), "treat-as-public to private: success.");
+
+promise_test(t => sharedWorkerScriptTest(t, {
+  source: { server: Server.HTTPS_PUBLIC },
+  target: { server: Server.HTTPS_PUBLIC },
+  expected: WorkerScriptTestResult.SUCCESS,
+}), "public to public: success.");
diff --git a/test/wpt/tests/fetch/private-network-access/shared-worker.window.js b/test/wpt/tests/fetch/private-network-access/shared-worker.window.js
new file mode 100644
index 00000000000..ffa8a360c70
--- /dev/null
+++ b/test/wpt/tests/fetch/private-network-access/shared-worker.window.js
@@ -0,0 +1,34 @@
+// META: script=/common/utils.js
+// META: script=resources/support.sub.js
+//
+// Spec: https://wicg.github.io/private-network-access/#integration-fetch
+//
+// These tests mirror `Worker` tests, except using `SharedWorker`.
+// See also: shared-worker.window.js
+//
+// This file covers only those tests that must execute in a non secure context.
+// Other tests are defined in: shared-worker.https.window.js
+
+promise_test(t => sharedWorkerScriptTest(t, {
+  source: {
+    server: Server.HTTP_LOCAL,
+    treatAsPublic: true,
+  },
+  target: { server: Server.HTTP_LOCAL },
+  expected: WorkerScriptTestResult.FAILURE,
+}), "treat-as-public to local: failure.");
+
+promise_test(t => sharedWorkerScriptTest(t, {
+  source: {
+    server: Server.HTTP_PRIVATE,
+    treatAsPublic: true,
+  },
+  target: { server: Server.HTTP_PRIVATE },
+  expected: WorkerScriptTestResult.FAILURE,
+}), "treat-as-public to private: failure.");
+
+promise_test(t => sharedWorkerScriptTest(t, {
+  source: { server: Server.HTTP_PUBLIC },
+  target: { server: Server.HTTP_PUBLIC },
+  expected: WorkerScriptTestResult.SUCCESS,
+}), "public to public: success.");
diff --git a/test/wpt/tests/fetch/private-network-access/websocket.https.window.js b/test/wpt/tests/fetch/private-network-access/websocket.https.window.js
new file mode 100644
index 00000000000..0731896098b
--- /dev/null
+++ b/test/wpt/tests/fetch/private-network-access/websocket.https.window.js
@@ -0,0 +1,40 @@
+// META: script=resources/support.sub.js
+//
+// Spec: https://wicg.github.io/private-network-access/#integration-fetch
+//
+// These tests verify that websocket connections behave similarly to fetches.
+//
+// This file covers only those tests that must execute in a secure context.
+// Other tests are defined in: websocket.https.window.js
+
+setup(() => {
+  // Making sure we are in a secure context, as expected.
+  assert_true(window.isSecureContext);
+});
+
+promise_test(t => websocketTest(t, {
+  source: { server: Server.HTTPS_LOCAL },
+  target: { server: Server.WSS_LOCAL },
+  expected: WebsocketTestResult.SUCCESS,
+}), "local to local: websocket success.");
+
+promise_test(t => websocketTest(t, {
+  source: { server: Server.HTTPS_PRIVATE },
+  target: { server: Server.WSS_LOCAL },
+  expected: WebsocketTestResult.SUCCESS,
+}), "private to local: websocket success.");
+
+promise_test(t => websocketTest(t, {
+  source: { server: Server.HTTPS_PUBLIC },
+  target: { server: Server.WSS_LOCAL },
+  expected: WebsocketTestResult.SUCCESS,
+}), "public to local: websocket success.");
+
+promise_test(t => websocketTest(t, {
+  source: {
+    server: Server.HTTPS_LOCAL,
+    treatAsPublic: true,
+  },
+  target: { server: Server.WSS_LOCAL },
+  expected: WebsocketTestResult.SUCCESS,
+}), "treat-as-public to local: websocket success.");
diff --git a/test/wpt/tests/fetch/private-network-access/websocket.window.js b/test/wpt/tests/fetch/private-network-access/websocket.window.js
new file mode 100644
index 00000000000..a44cfaedec7
--- /dev/null
+++ b/test/wpt/tests/fetch/private-network-access/websocket.window.js
@@ -0,0 +1,40 @@
+// META: script=resources/support.sub.js
+//
+// Spec: https://wicg.github.io/private-network-access/#integration-fetch
+
+// These tests verify that websocket connections behave similarly to fetches.
+//
+// This file covers only those tests that must execute in a non secure context.
+// Other tests are defined in: websocket.https.window.js
+
+setup(() => {
+  // Making sure we are in a non secure context, as expected.
+  assert_false(window.isSecureContext);
+});
+
+promise_test(t => websocketTest(t, {
+  source: { server: Server.HTTP_LOCAL },
+  target: { server: Server.WS_LOCAL },
+  expected: WebsocketTestResult.SUCCESS,
+}), "local to local: websocket success.");
+
+promise_test(t => websocketTest(t, {
+  source: { server: Server.HTTP_PRIVATE },
+  target: { server: Server.WS_LOCAL },
+  expected: WebsocketTestResult.FAILURE,
+}), "private to local: websocket failure.");
+
+promise_test(t => websocketTest(t, {
+  source: { server: Server.HTTP_PUBLIC },
+  target: { server: Server.WS_LOCAL },
+  expected: WebsocketTestResult.FAILURE,
+}), "public to local: websocket failure.");
+
+promise_test(t => websocketTest(t, {
+  source: {
+    server: Server.HTTP_LOCAL,
+    treatAsPublic: true,
+  },
+  target: { server: Server.WS_LOCAL },
+  expected: WebsocketTestResult.FAILURE,
+}), "treat-as-public to local: websocket failure.");
diff --git a/test/wpt/tests/fetch/private-network-access/worker-blob-fetch.window.js b/test/wpt/tests/fetch/private-network-access/worker-blob-fetch.window.js
new file mode 100644
index 00000000000..e119746b8a6
--- /dev/null
+++ b/test/wpt/tests/fetch/private-network-access/worker-blob-fetch.window.js
@@ -0,0 +1,155 @@
+// META: script=/common/utils.js
+// META: script=resources/support.sub.js
+//
+// Spec: https://wicg.github.io/private-network-access/#integration-fetch
+//
+// These tests check that fetches from within `Worker` scripts loaded from blob
+// URLs are subject to Private Network Access checks, just like fetches from
+// within documents.
+//
+// This file covers only those tests that must execute in a non-secure context.
+// Other tests are defined in: worker-blob-fetch.https.window.js
+
+promise_test(t => workerBlobFetchTest(t, {
+  source: { server: Server.HTTP_LOCAL },
+  target: { server: Server.HTTP_LOCAL },
+  expected: WorkerFetchTestResult.SUCCESS,
+}), "local to local: success.");
+
+promise_test(t => workerBlobFetchTest(t, {
+  source: { server: Server.HTTP_PRIVATE },
+  target: {
+    server: Server.HTTP_LOCAL,
+    behavior: {
+      preflight: PreflightBehavior.optionalSuccess(token()),
+      response: ResponseBehavior.allowCrossOrigin(),
+    },
+  },
+  expected: WorkerFetchTestResult.FAILURE,
+}), "private to local: failure.");
+
+promise_test(t => workerBlobFetchTest(t, {
+  source: { server: Server.HTTP_PRIVATE },
+  target: { server: Server.HTTP_PRIVATE },
+  expected: WorkerFetchTestResult.SUCCESS,
+}), "private to private: success.");
+
+promise_test(t => workerBlobFetchTest(t, {
+  source: { server: Server.HTTP_PUBLIC },
+  target: {
+    server: Server.HTTP_LOCAL,
+    behavior: {
+      preflight: PreflightBehavior.optionalSuccess(token()),
+      response: ResponseBehavior.allowCrossOrigin(),
+    },
+  },
+  expected: WorkerFetchTestResult.FAILURE,
+}), "public to local: failure.");
+
+promise_test(t => workerBlobFetchTest(t, {
+  source: { server: Server.HTTP_PUBLIC },
+  target: {
+    server: Server.HTTP_PRIVATE,
+    behavior: {
+      preflight: PreflightBehavior.optionalSuccess(token()),
+      response: ResponseBehavior.allowCrossOrigin(),
+    },
+  },
+  expected: WorkerFetchTestResult.FAILURE,
+}), "public to private: failure.");
+
+promise_test(t => workerBlobFetchTest(t, {
+  source: { server: Server.HTTP_PUBLIC },
+  target: { server: Server.HTTP_PUBLIC },
+  expected: WorkerFetchTestResult.SUCCESS,
+}), "public to public: success.");
+
+promise_test(t => workerBlobFetchTest(t, {
+  source: {
+    server: Server.HTTP_LOCAL,
+    treatAsPublic: true,
+  },
+  target: {
+    server: Server.HTTP_LOCAL,
+    behavior: { preflight: PreflightBehavior.optionalSuccess(token()) },
+  },
+  expected: WorkerFetchTestResult.FAILURE,
+}), "treat-as-public to local: failure.");
+
+promise_test(t => workerBlobFetchTest(t, {
+  source: {
+    server: Server.HTTP_LOCAL,
+    treatAsPublic: true,
+  },
+  target: {
+    server: Server.HTTP_PRIVATE,
+    behavior: {
+      preflight: PreflightBehavior.optionalSuccess(token()),
+      response: ResponseBehavior.allowCrossOrigin(),
+    },
+  },
+  expected: WorkerFetchTestResult.FAILURE,
+}), "treat-as-public to private: failure.");
+
+promise_test(t => workerBlobFetchTest(t, {
+  source: {
+    server: Server.HTTP_LOCAL,
+    treatAsPublic: true,
+  },
+  target: {
+    server: Server.HTTP_PUBLIC,
+    behavior: { response: ResponseBehavior.allowCrossOrigin() },
+  },
+  expected: WorkerFetchTestResult.SUCCESS,
+}), "treat-as-public to public: success.");
+
+// The following tests verify that workers served over HTTPS are not allowed to
+// make private network requests because they are not secure contexts.
+
+promise_test(t => workerBlobFetchTest(t, {
+  source: { server: Server.HTTPS_LOCAL },
+  target: {
+    server: Server.HTTPS_LOCAL,
+    behavior: {
+      preflight: PreflightBehavior.optionalSuccess(token()),
+      response: ResponseBehavior.allowCrossOrigin(),
+    },
+  },
+  expected: WorkerFetchTestResult.SUCCESS,
+}), "local https to local https: success.");
+
+promise_test(t => workerBlobFetchTest(t, {
+  source: { server: Server.HTTPS_PRIVATE },
+  target: {
+    server: Server.HTTPS_LOCAL,
+    behavior: {
+      preflight: PreflightBehavior.optionalSuccess(token()),
+      response: ResponseBehavior.allowCrossOrigin(),
+    },
+  },
+  expected: WorkerFetchTestResult.FAILURE,
+}), "private https to local https: failure.");
+
+promise_test(t => workerBlobFetchTest(t, {
+  source: { server: Server.HTTPS_PUBLIC },
+  target: {
+    server: Server.HTTPS_PRIVATE,
+    behavior: {
+      preflight: PreflightBehavior.optionalSuccess(token()),
+      response: ResponseBehavior.allowCrossOrigin(),
+    },
+  },
+  expected: WorkerFetchTestResult.FAILURE,
+}), "public https to private https: failure.");
+
+promise_test(t => workerBlobFetchTest(t, {
+  source: { server: Server.HTTPS_PUBLIC },
+  target: {
+    server: Server.HTTPS_LOCAL,
+    behavior: {
+      preflight: PreflightBehavior.optionalSuccess(token()),
+      response: ResponseBehavior.allowCrossOrigin(),
+    },
+  },
+  expected: WorkerFetchTestResult.FAILURE,
+}), "public https to local https: failure.");
diff --git a/test/wpt/tests/fetch/private-network-access/worker-fetch.https.window.js b/test/wpt/tests/fetch/private-network-access/worker-fetch.https.window.js
new file mode 100644
index 00000000000..89e0c3cf1f3
--- /dev/null
+++ b/test/wpt/tests/fetch/private-network-access/worker-fetch.https.window.js
@@ -0,0 +1,151 @@
+// META: script=/common/utils.js
+// META: script=resources/support.sub.js
+//
+// Spec: https://wicg.github.io/private-network-access/#integration-fetch
+//
+// These tests check that fetches from within `Worker` scripts are subject to
+// Private Network Access checks, just like fetches from within documents.
+//
+// This file covers only those tests that must execute in a secure context.
+// Other tests are defined in: worker-fetch.window.js
+
+promise_test(t => workerFetchTest(t, {
+  source: { server: Server.HTTPS_LOCAL },
+  target: { server: Server.HTTPS_LOCAL },
+  expected: WorkerFetchTestResult.SUCCESS,
+}), "local to local: success.");
+
+promise_test(t => workerFetchTest(t, {
+  source: { server: Server.HTTPS_PRIVATE },
+  target: {
+    server: Server.HTTPS_LOCAL,
+    behavior: { response: ResponseBehavior.allowCrossOrigin() },
+  },
+  expected: WorkerFetchTestResult.FAILURE,
+}), "private to local: failed preflight.");
+
+promise_test(t => workerFetchTest(t, {
+  source: { server: Server.HTTPS_PRIVATE },
+  target: {
+    server: Server.HTTPS_LOCAL,
+    behavior: {
+      preflight: PreflightBehavior.success(token()),
+      response: ResponseBehavior.allowCrossOrigin(),
+    },
+  },
+  expected: WorkerFetchTestResult.SUCCESS,
+}), "private to local: success.");
+
+promise_test(t => workerFetchTest(t, {
+  source: { server: Server.HTTPS_PRIVATE },
+  target: { server: Server.HTTPS_PRIVATE },
+  expected: WorkerFetchTestResult.SUCCESS,
+}), "private to private: success.");
+
+promise_test(t => workerFetchTest(t, {
+  source: { server: Server.HTTPS_PUBLIC },
+  target: {
+    server: Server.HTTPS_LOCAL,
+    behavior: { response: ResponseBehavior.allowCrossOrigin() },
+  },
+  expected: WorkerFetchTestResult.FAILURE,
+}), "public to local: failed preflight.");
+
+promise_test(t => workerFetchTest(t, {
+  source: { server: Server.HTTPS_PUBLIC },
+  target: {
+    server: Server.HTTPS_LOCAL,
+    behavior: {
+      preflight: PreflightBehavior.success(token()),
+      response: ResponseBehavior.allowCrossOrigin(),
+    },
+  },
+  expected: WorkerFetchTestResult.SUCCESS,
+}), "public to local: success.");
+
+promise_test(t => workerFetchTest(t, {
+  source: { server: Server.HTTPS_PUBLIC },
+  target: {
+    server: Server.HTTPS_PRIVATE,
+    behavior: { response: ResponseBehavior.allowCrossOrigin() },
+  },
+  expected: WorkerFetchTestResult.FAILURE,
+}), "public to private: failed preflight.");
+
+promise_test(t => workerFetchTest(t, {
+  source: { server: Server.HTTPS_PUBLIC },
+  target: {
+    server: Server.HTTPS_PRIVATE,
+    behavior: {
+      preflight: PreflightBehavior.success(token()),
+      response: ResponseBehavior.allowCrossOrigin(),
+    },
+  },
+  expected: WorkerFetchTestResult.SUCCESS,
+}), "public to private: success.");
+
+promise_test(t => workerFetchTest(t, {
+  source: { server: Server.HTTPS_PUBLIC },
+  target: { server: Server.HTTPS_PUBLIC },
+  expected: WorkerFetchTestResult.SUCCESS,
+}), "public to public: success.");
+
+promise_test(t => workerFetchTest(t, {
+  source: {
+    server: Server.HTTPS_LOCAL,
+    treatAsPublic: true,
+  },
+  target: { server: Server.HTTPS_LOCAL },
+  expected: WorkerFetchTestResult.FAILURE,
+}), "treat-as-public to local: failed preflight.");
+
+promise_test(t => workerFetchTest(t, {
+  source: {
+    server: Server.HTTPS_LOCAL,
+    treatAsPublic: true,
+  },
+  target: {
+    server: Server.HTTPS_LOCAL,
+    behavior: { preflight: PreflightBehavior.optionalSuccess(token()) },
+  },
+  expected: WorkerFetchTestResult.SUCCESS,
+}), "treat-as-public to local: success.");
+
+promise_test(t => workerFetchTest(t, {
+  source: {
+    server: Server.HTTPS_LOCAL,
+    treatAsPublic: true,
+  },
+  target: {
+    server: Server.HTTPS_PRIVATE,
+    behavior: { response: ResponseBehavior.allowCrossOrigin() },
+  },
+  expected: WorkerFetchTestResult.FAILURE,
+}), "treat-as-public to private: failed preflight.");
+
+promise_test(t => workerFetchTest(t, {
+  source: {
+    server: Server.HTTPS_LOCAL,
+    treatAsPublic: true,
+  },
+  target: {
+    server: Server.HTTPS_PRIVATE,
+    behavior: {
+      preflight: PreflightBehavior.success(token()),
+      response: ResponseBehavior.allowCrossOrigin(),
+    },
+  },
+  expected: WorkerFetchTestResult.SUCCESS,
+}), "treat-as-public to private: success.");
+
+promise_test(t => workerFetchTest(t, {
+  source: {
+    server: Server.HTTPS_LOCAL,
+    treatAsPublic: true,
+  },
+  target: {
+    server: Server.HTTPS_PUBLIC,
+    behavior: { response: ResponseBehavior.allowCrossOrigin() },
+  },
+  expected: WorkerFetchTestResult.SUCCESS,
+}), "treat-as-public to public: success.");
diff --git a/test/wpt/tests/fetch/private-network-access/worker-fetch.window.js b/test/wpt/tests/fetch/private-network-access/worker-fetch.window.js
new file mode 100644
index 00000000000..4d6b12f0671
--- /dev/null
+++ b/test/wpt/tests/fetch/private-network-access/worker-fetch.window.js
@@ -0,0 +1,154 @@
+// META: script=/common/utils.js
+// META: script=resources/support.sub.js
+//
+// Spec: https://wicg.github.io/private-network-access/#integration-fetch
+//
+// These tests check that fetches from within `Worker` scripts are subject to
+// Private Network Access checks, just like fetches from within documents.
+//
+// This file covers only those tests that must execute in a non-secure context.
+// Other tests are defined in: worker-fetch.https.window.js
+
+promise_test(t => workerFetchTest(t, {
+  source: { server: Server.HTTP_LOCAL },
+  target: { server: Server.HTTP_LOCAL },
+  expected: WorkerFetchTestResult.SUCCESS,
+}), "local to local: success.");
+
+promise_test(t => workerFetchTest(t, {
+  source: { server: Server.HTTP_PRIVATE },
+  target: {
+    server: Server.HTTP_LOCAL,
+    behavior: {
+      preflight: PreflightBehavior.optionalSuccess(token()),
+      response: ResponseBehavior.allowCrossOrigin(),
+    },
+  },
+  expected: WorkerFetchTestResult.FAILURE,
+}), "private to local: failure.");
+
+promise_test(t => workerFetchTest(t, {
+  source: { server: Server.HTTP_PRIVATE },
+  target: { server: Server.HTTP_PRIVATE },
+  expected: WorkerFetchTestResult.SUCCESS,
+}), "private to private: success.");
+
+promise_test(t => workerFetchTest(t, {
+  source: { server: Server.HTTP_PUBLIC },
+  target: {
+    server: Server.HTTP_LOCAL,
+    behavior: {
+      preflight: PreflightBehavior.optionalSuccess(token()),
+      response: ResponseBehavior.allowCrossOrigin(),
+    },
+  },
+  expected: WorkerFetchTestResult.FAILURE,
+}), "public to local: failure.");
+
+promise_test(t => workerFetchTest(t, {
+  source: { server: Server.HTTP_PUBLIC },
+  target: {
+    server: Server.HTTP_PRIVATE,
+    behavior: {
+      preflight: PreflightBehavior.optionalSuccess(token()),
+      response: ResponseBehavior.allowCrossOrigin(),
+    },
+  },
+  expected: WorkerFetchTestResult.FAILURE,
+}), "public to private: failure.");
+
+promise_test(t => workerFetchTest(t, {
+  source: { server: Server.HTTP_PUBLIC },
+  target: { server: Server.HTTP_PUBLIC },
+  expected: WorkerFetchTestResult.SUCCESS,
+}), "public to public: success.");
+
+promise_test(t => workerFetchTest(t, {
+  source: {
+    server: Server.HTTP_LOCAL,
+    treatAsPublic: true,
+  },
+  target: {
+    server: Server.HTTP_LOCAL,
+    behavior: { preflight: PreflightBehavior.optionalSuccess(token()) },
+  },
+  expected: WorkerFetchTestResult.FAILURE,
+}), "treat-as-public to local: failure.");
+
+promise_test(t => workerFetchTest(t, {
+  source: {
+    server: Server.HTTP_LOCAL,
+    treatAsPublic: true,
+  },
+  target: {
+    server: Server.HTTP_PRIVATE,
+    behavior: {
+      preflight: PreflightBehavior.optionalSuccess(token()),
+      response: ResponseBehavior.allowCrossOrigin(),
+    },
+  },
+  expected: WorkerFetchTestResult.FAILURE,
+}), "treat-as-public to private: failure.");
+
+promise_test(t => workerFetchTest(t, {
+  source: {
+    server: Server.HTTP_LOCAL,
+    treatAsPublic: true,
+  },
+  target: {
+    server: Server.HTTP_PUBLIC,
+    behavior: { response: ResponseBehavior.allowCrossOrigin() },
+  },
+  expected: WorkerFetchTestResult.SUCCESS,
+}), "treat-as-public to public: success.");
+
+// The following tests verify that workers served over HTTPS are not allowed to
+// make private network requests because they are not secure contexts.
+
+promise_test(t => workerFetchTest(t, {
+  source: { server: Server.HTTPS_LOCAL },
+  target: {
+    server: Server.HTTPS_LOCAL,
+    behavior: {
+      preflight: PreflightBehavior.optionalSuccess(token()),
+      response: ResponseBehavior.allowCrossOrigin(),
+    },
+  },
+  expected: WorkerFetchTestResult.SUCCESS,
+}), "local https to local https: success.");
+
+promise_test(t => workerFetchTest(t, {
+  source: { server: Server.HTTPS_PRIVATE },
+  target: {
+    server: Server.HTTPS_LOCAL,
+    behavior: {
+      preflight: PreflightBehavior.optionalSuccess(token()),
+      response: ResponseBehavior.allowCrossOrigin(),
+    },
+  },
+  expected: WorkerFetchTestResult.FAILURE,
+}), "private https to local https: failure.");
+
+promise_test(t => workerFetchTest(t, {
+  source: { server: Server.HTTPS_PUBLIC },
+  target: {
+    server: Server.HTTPS_PRIVATE,
+    behavior: {
+      preflight: PreflightBehavior.optionalSuccess(token()),
+      response: ResponseBehavior.allowCrossOrigin(),
+    },
+  },
+  expected: WorkerFetchTestResult.FAILURE,
+}), "public https to private https: failure.");
+
+promise_test(t => workerFetchTest(t, {
+  source: { server: Server.HTTPS_PUBLIC },
+  target: {
+    server: Server.HTTPS_LOCAL,
+    behavior: {
+      preflight: PreflightBehavior.optionalSuccess(token()),
+      response: ResponseBehavior.allowCrossOrigin(),
+    },
+  },
+  expected: WorkerFetchTestResult.FAILURE,
+}), "public https to local https: failure.");
diff --git a/test/wpt/tests/fetch/private-network-access/worker.https.window.js b/test/wpt/tests/fetch/private-network-access/worker.https.window.js
new file mode 100644
index 00000000000..2d0dddd685c
--- /dev/null
+++ b/test/wpt/tests/fetch/private-network-access/worker.https.window.js
@@ -0,0 +1,61 @@
+// META: script=/common/utils.js
+// META: script=resources/support.sub.js
+//
+// Spec: https://wicg.github.io/private-network-access/#integration-fetch
+//
+// These tests check that initial `Worker` script fetches are subject to Private
+// Network Access checks, just like a regular `fetch()`. The main difference is
+// that workers can only be fetched same-origin, so the only way to test this
+// is using the `treat-as-public` CSP directive to artificially place the parent
+// document in the `public` IP address space.
+//
+// This file covers only those tests that must execute in a secure context.
+// Other tests are defined in: worker.window.js
+
+promise_test(t => workerScriptTest(t, {
+  source: {
+    server: Server.HTTPS_LOCAL,
+    treatAsPublic: true,
+  },
+  target: { server: Server.HTTPS_LOCAL },
+  expected: WorkerScriptTestResult.FAILURE,
+}), "treat-as-public to local: failed preflight.");
+
+promise_test(t => workerScriptTest(t, {
+  source: {
+    server: Server.HTTPS_LOCAL,
+    treatAsPublic: true,
+  },
+  target: {
+    server: Server.HTTPS_LOCAL,
+    behavior: { preflight: PreflightBehavior.optionalSuccess(token()) },
+  },
+  expected: WorkerScriptTestResult.SUCCESS,
+}), "treat-as-public to local: success.");
+
+promise_test(t => workerScriptTest(t, {
+  source: {
+    server: Server.HTTPS_PRIVATE,
+    treatAsPublic: true,
+  },
+  target: { server: Server.HTTPS_PRIVATE },
+  expected: WorkerScriptTestResult.FAILURE,
+}), "treat-as-public to private: failed preflight.");
+
+promise_test(t => workerScriptTest(t, {
+  source: {
+    server: Server.HTTPS_PRIVATE,
+    treatAsPublic: true,
+  },
+  target: {
+    server: Server.HTTPS_PRIVATE,
+    behavior: { preflight: PreflightBehavior.optionalSuccess(token()) },
+  },
+  expected: WorkerScriptTestResult.SUCCESS,
+}), "treat-as-public to private: success.");
+
+promise_test(t => workerScriptTest(t, {
+  source: { server: Server.HTTPS_PUBLIC },
+  target: { server: Server.HTTPS_PUBLIC },
+  expected: WorkerScriptTestResult.SUCCESS,
+}), "public to public: success.");
diff --git a/test/wpt/tests/fetch/private-network-access/worker.window.js b/test/wpt/tests/fetch/private-network-access/worker.window.js
new file mode 100644
index 00000000000..118c0992544
--- /dev/null
+++ b/test/wpt/tests/fetch/private-network-access/worker.window.js
@@ -0,0 +1,37 @@
+// META: script=/common/utils.js
+// META: script=resources/support.sub.js
+//
+// Spec: https://wicg.github.io/private-network-access/#integration-fetch
+//
+// These tests check that initial `Worker` script fetches are subject to Private
+// Network Access checks, just like a regular `fetch()`. The main difference is
+// that workers can only be fetched same-origin, so the only way to test this
+// is using the `treat-as-public` CSP directive to artificially place the parent
+// document in the `public` IP address space.
+//
+// This file covers only those tests that must execute in a non secure context.
+// Other tests are defined in: worker.https.window.js
+
+promise_test(t => workerScriptTest(t, {
+  source: {
+    server: Server.HTTP_LOCAL,
+    treatAsPublic: true,
+  },
+  target: { server: Server.HTTP_LOCAL },
+  expected: WorkerScriptTestResult.FAILURE,
+}), "treat-as-public to local: failure.");
+
+promise_test(t => workerScriptTest(t, {
+  source: {
+    server: Server.HTTP_PRIVATE,
+    treatAsPublic: true,
+  },
+  target: { server: Server.HTTP_PRIVATE },
+  expected: WorkerScriptTestResult.FAILURE,
+}), "treat-as-public to private: failure.");
+
+promise_test(t => workerScriptTest(t, {
+  source: { server: Server.HTTP_PUBLIC },
+  target: { server: Server.HTTP_PUBLIC },
+  expected: WorkerScriptTestResult.SUCCESS,
+}), "public to public: success.");
diff --git a/test/wpt/tests/fetch/private-network-access/xhr-from-treat-as-public.https.window.js b/test/wpt/tests/fetch/private-network-access/xhr-from-treat-as-public.https.window.js
new file mode 100644
index 00000000000..04fe5449d19
--- /dev/null
+++ b/test/wpt/tests/fetch/private-network-access/xhr-from-treat-as-public.https.window.js
@@ -0,0 +1,74 @@
+// META: script=/common/utils.js
+// META: script=resources/support.sub.js
+//
+// Spec: https://wicg.github.io/private-network-access/#integration-fetch
+//
+// These tests verify that documents fetched from the `local` address space yet
+// carrying the `treat-as-public-address` CSP directive are treated as if they
+// had been fetched from the `public` address space.
+
+promise_test(t => xhrTest(t, {
+  source: {
+    server: Server.HTTPS_LOCAL,
+    treatAsPublic: true,
+  },
+  target: {
+    server: Server.HTTPS_LOCAL,
+    behavior: { response: ResponseBehavior.allowCrossOrigin() },
+  },
+  expected: XhrTestResult.FAILURE,
+}), "treat-as-public to local: failed preflight.");
+
+promise_test(t => xhrTest(t, {
+  source: {
+    server: Server.HTTPS_LOCAL,
+    treatAsPublic: true,
+  },
+  target: {
+    server: Server.HTTPS_LOCAL,
+    behavior: {
+      preflight: PreflightBehavior.optionalSuccess(token()),
+      response: ResponseBehavior.allowCrossOrigin(),
+    },
+  },
+  expected: XhrTestResult.SUCCESS,
+}), "treat-as-public to local: success.");
+
+promise_test(t => xhrTest(t, {
+  source: {
+    server: Server.HTTPS_LOCAL,
+    treatAsPublic: true,
+  },
+  target: {
+    server: Server.HTTPS_PRIVATE,
+    behavior: { response: ResponseBehavior.allowCrossOrigin() },
+  },
+  expected: XhrTestResult.FAILURE,
+}), "treat-as-public to private: failed preflight.");
+
+promise_test(t => xhrTest(t, {
+  source: {
+    server: Server.HTTPS_LOCAL,
+    treatAsPublic: true,
+  },
+  target: {
+    server: Server.HTTPS_PRIVATE,
+    behavior: {
+      preflight: PreflightBehavior.optionalSuccess(token()),
+      response: ResponseBehavior.allowCrossOrigin(),
+    },
+  },
+  expected: XhrTestResult.SUCCESS,
+}), "treat-as-public to private: success.");
+
+promise_test(t => xhrTest(t, {
+  source: {
+    server: Server.HTTPS_LOCAL,
+    treatAsPublic: true,
+  },
+  target: {
+    server: Server.HTTPS_PUBLIC,
+    behavior: { response: ResponseBehavior.allowCrossOrigin() },
+  },
+  expected: XhrTestResult.SUCCESS,
+}), "treat-as-public to public: no preflight required.");
diff --git a/test/wpt/tests/fetch/private-network-access/xhr.https.window.js b/test/wpt/tests/fetch/private-network-access/xhr.https.window.js
new file mode 100644
index 00000000000..4dc5da9912f
--- /dev/null
+++ b/test/wpt/tests/fetch/private-network-access/xhr.https.window.js
@@ -0,0 +1,142 @@
+// META: script=/common/subset-tests-by-key.js
+// META: script=/common/utils.js
+// META: script=resources/support.sub.js
+// META: variant=?include=from-local
+// META: variant=?include=from-private
+// META: variant=?include=from-public
+//
+// Spec: https://wicg.github.io/private-network-access/#integration-fetch
+//
+// These tests mirror fetch.https.window.js, but use `XmlHttpRequest` instead of
+// `fetch()` to perform subresource fetches. Preflights are tested less
+// extensively due to coverage being already provided by `fetch()`.
+//
+// This file covers only those tests that must execute in a secure context.
+// Other tests are defined in: xhr.window.js
+
+setup(() => {
+  // Making sure we are in a secure context, as expected.
+  assert_true(window.isSecureContext);
+});
+
+// Source: secure local context.
+//
+// All fetches unaffected by Private Network Access.
+
+subsetTestByKey("from-local", promise_test, t => xhrTest(t, {
+  source: { server: Server.HTTPS_LOCAL },
+  target: { server: Server.HTTPS_LOCAL },
+  expected: XhrTestResult.SUCCESS,
+}), "local to local: no preflight required.");
+
+subsetTestByKey("from-local", promise_test, t => xhrTest(t, {
+  source: { server: Server.HTTPS_LOCAL },
+  target: {
+    server: Server.HTTPS_PRIVATE,
+    behavior: { response: ResponseBehavior.allowCrossOrigin() },
+  },
+  expected: XhrTestResult.SUCCESS,
+}), "local to private: no preflight required.");
+
+subsetTestByKey("from-local", promise_test, t => xhrTest(t, {
+  source: { server: Server.HTTPS_LOCAL },
+  target: {
+    server: Server.HTTPS_PUBLIC,
+    behavior: { response: ResponseBehavior.allowCrossOrigin() },
+  },
+  expected: XhrTestResult.SUCCESS,
+}), "local to public: no preflight required.");
+
+// Source: private secure context.
+//
+// Fetches to the local address space require a successful preflight response
+// carrying a PNA-specific header.
+
+subsetTestByKey("from-private", promise_test, t => xhrTest(t, {
+  source: { server: Server.HTTPS_PRIVATE },
+  target: {
+    server: Server.HTTPS_LOCAL,
+    behavior: { response: ResponseBehavior.allowCrossOrigin() },
+  },
+  expected: XhrTestResult.FAILURE,
+}), "private to local: failed preflight.");
+
+subsetTestByKey("from-private", promise_test, t => xhrTest(t, {
+  source: { server: Server.HTTPS_PRIVATE },
+  target: {
+    server: Server.HTTPS_LOCAL,
+    behavior: {
+      preflight: PreflightBehavior.success(token()),
+      response: ResponseBehavior.allowCrossOrigin(),
+    },
+  },
+  expected: XhrTestResult.SUCCESS,
+}), "private to local: success.");
+
+subsetTestByKey("from-private", promise_test, t => xhrTest(t, {
+  source: { server: Server.HTTPS_PRIVATE },
+  target: { server: Server.HTTPS_PRIVATE },
+  expected: XhrTestResult.SUCCESS,
+}), "private to private: no preflight required.");
+
+subsetTestByKey("from-private", promise_test, t => xhrTest(t, {
+  source: { server: Server.HTTPS_PRIVATE },
+  target: {
+    server: Server.HTTPS_PUBLIC,
+    behavior: { response: ResponseBehavior.allowCrossOrigin() },
+  },
+  expected: XhrTestResult.SUCCESS,
+}), "private to public: no preflight required.");
+
+// Source: public secure context.
+//
+// Fetches to the local and private address spaces require a successful
+// preflight response carrying a PNA-specific header.
+
+subsetTestByKey("from-public", promise_test, t => xhrTest(t, {
+  source: { server: Server.HTTPS_PUBLIC },
+  target: {
+    server: Server.HTTPS_LOCAL,
+    behavior: { response: ResponseBehavior.allowCrossOrigin() },
+  },
+  expected: XhrTestResult.FAILURE,
+}), "public to local: failed preflight.");
+
+subsetTestByKey("from-public", promise_test, t => xhrTest(t, {
+  source: { server: Server.HTTPS_PUBLIC },
+  target: {
+    server: Server.HTTPS_LOCAL,
+    behavior: {
+      preflight: PreflightBehavior.success(token()),
+      response: ResponseBehavior.allowCrossOrigin(),
+    },
+  },
+  expected: XhrTestResult.SUCCESS,
+}), "public to local: success.");
+
+subsetTestByKey("from-public", promise_test, t => xhrTest(t, {
+  source: { server: Server.HTTPS_PUBLIC },
+  target: {
+    server: Server.HTTPS_PRIVATE,
+    behavior: { response: ResponseBehavior.allowCrossOrigin() },
+  },
+  expected: XhrTestResult.FAILURE,
+}), "public to private: failed preflight.");
+
+subsetTestByKey("from-public", promise_test, t => xhrTest(t, {
+  source: { server: Server.HTTPS_PUBLIC },
+  target: {
+    server: Server.HTTPS_PRIVATE,
+    behavior: {
+      preflight: PreflightBehavior.success(token()),
+      response: ResponseBehavior.allowCrossOrigin(),
+    },
+  },
+  expected: XhrTestResult.SUCCESS,
+}), "public to private: success.");
+
+subsetTestByKey("from-public", promise_test, t => xhrTest(t, {
+  source: { server: Server.HTTPS_PUBLIC },
+  target: { server: Server.HTTPS_PUBLIC },
+  expected: XhrTestResult.SUCCESS,
+}), "public to public: no preflight required.");
diff --git a/test/wpt/tests/fetch/private-network-access/xhr.window.js b/test/wpt/tests/fetch/private-network-access/xhr.window.js
new file mode 100644
index 00000000000..fa307dc559a
--- /dev/null
+++ b/test/wpt/tests/fetch/private-network-access/xhr.window.js
@@ -0,0 +1,195 @@
+// META: script=/common/utils.js
+// META: script=resources/support.sub.js
+//
+// Spec: https://wicg.github.io/private-network-access/#integration-fetch
+//
+// These tests mirror fetch.window.js, but use `XmlHttpRequest` instead of
+// `fetch()` to perform subresource fetches.
+//
+// This file covers only those tests that must execute in a non secure context.
+// Other tests are defined in: xhr.https.window.js
+
+setup(() => {
+  // Making sure we are in a non secure context, as expected.
+  assert_false(window.isSecureContext);
+});
+
+promise_test(t => xhrTest(t, {
+  source: { server: Server.HTTP_LOCAL },
+  target: { server: Server.HTTP_LOCAL },
+  expected: XhrTestResult.SUCCESS,
+}), "local to local: no preflight required.");
+
+promise_test(t => xhrTest(t, {
+  source: { server: Server.HTTP_LOCAL },
+  target: {
+    server: Server.HTTP_PRIVATE,
+    behavior: { response: ResponseBehavior.allowCrossOrigin() },
+  },
+  expected: XhrTestResult.SUCCESS,
+}), "local to private: no preflight required.");
+
+promise_test(t => xhrTest(t, {
+  source: { server: Server.HTTP_LOCAL },
+  target: {
+    server: Server.HTTP_PUBLIC,
+    behavior: { response: ResponseBehavior.allowCrossOrigin() },
+  },
+  expected: XhrTestResult.SUCCESS,
+}), "local to public: no preflight required.");
+
+promise_test(t => xhrTest(t, {
+  source: { server: Server.HTTP_PRIVATE },
+  target: {
+    server: Server.HTTP_LOCAL,
+    behavior: {
+      preflight: PreflightBehavior.optionalSuccess(token()),
+      response: ResponseBehavior.allowCrossOrigin(),
+    },
+  },
+  expected: XhrTestResult.FAILURE,
+}), "private to local: failure.");
+
+promise_test(t => xhrTest(t, {
+  source: { server: Server.HTTP_PRIVATE },
+  target: { server: Server.HTTP_PRIVATE },
+  expected: XhrTestResult.SUCCESS,
+}), "private to private: no preflight required.");
+
+promise_test(t => xhrTest(t, {
+  source: { server: Server.HTTP_PRIVATE },
+  target: {
+    server: Server.HTTP_PUBLIC,
+    behavior: { response: ResponseBehavior.allowCrossOrigin() },
+  },
+  expected: XhrTestResult.SUCCESS,
+}), "private to public: no preflight required.");
+
+promise_test(t => xhrTest(t, {
+  source: { server: Server.HTTP_PUBLIC },
+  target: {
+    server: Server.HTTP_LOCAL,
+    behavior: {
+      preflight: PreflightBehavior.optionalSuccess(token()),
+      response: ResponseBehavior.allowCrossOrigin(),
+    },
+  },
+  expected: XhrTestResult.FAILURE,
+}), "public to local: failure.");
+
+promise_test(t => xhrTest(t, {
+  source: { server: Server.HTTP_PUBLIC },
+  target: {
+    server: Server.HTTP_PRIVATE,
+    behavior: {
+      preflight: PreflightBehavior.optionalSuccess(token()),
+      response: ResponseBehavior.allowCrossOrigin(),
+    },
+  },
+  expected: XhrTestResult.FAILURE,
+}), "public to private: failure.");
+
+promise_test(t => xhrTest(t, {
+  source: { server: Server.HTTP_PUBLIC },
+  target: { server: Server.HTTP_PUBLIC },
+  expected: XhrTestResult.SUCCESS,
+}), "public to public: no preflight required.");
+
+// These tests verify that documents fetched from the `local` address space yet
+// carrying the `treat-as-public-address` CSP directive are treated as if they
+// had been fetched from the `public` address space.
+
+promise_test(t => xhrTest(t, {
+  source: {
+    server: Server.HTTP_LOCAL,
+    treatAsPublic: true,
+  },
+  target: {
+    server: Server.HTTP_LOCAL,
+    behavior: {
+      preflight: PreflightBehavior.optionalSuccess(token()),
+      response: ResponseBehavior.allowCrossOrigin(),
+    },
+  },
+  expected: XhrTestResult.FAILURE,
+}), "treat-as-public-address to local: failure.");
+
+promise_test(t => xhrTest(t, {
+  source: {
+    server: Server.HTTP_LOCAL,
+    treatAsPublic: true,
+  },
+  target: {
+    server: Server.HTTP_PRIVATE,
+    behavior: {
+      preflight: PreflightBehavior.optionalSuccess(token()),
+      response: ResponseBehavior.allowCrossOrigin(),
+    },
+  },
+  expected: XhrTestResult.FAILURE,
+}), "treat-as-public-address to private: failure.");
+
+promise_test(t => xhrTest(t, {
+  source: {
+    server: Server.HTTP_LOCAL,
+    treatAsPublic: true,
+  },
+  target: {
+    server: Server.HTTP_PUBLIC,
+    behavior: { response: ResponseBehavior.allowCrossOrigin() },
+  },
+  expected: XhrTestResult.SUCCESS,
+}), "treat-as-public-address to public: no preflight required.");
+
+// These tests verify that HTTPS iframes embedded in an HTTP top-level document
+// cannot fetch subresources from less-public address spaces. Indeed, even
+// though the iframes have HTTPS origins, they are non-secure contexts because
+// their parent is a non-secure context.
+
+promise_test(t => xhrTest(t, {
+  source: { server: Server.HTTPS_LOCAL },
+  target: {
+    server: Server.HTTPS_LOCAL,
+    behavior: {
+      preflight: PreflightBehavior.optionalSuccess(token()),
+      response: ResponseBehavior.allowCrossOrigin(),
+    },
+  },
+  expected: XhrTestResult.SUCCESS,
+}), "local https to local: success.");
+
+promise_test(t => xhrTest(t, {
+  source: { server: Server.HTTPS_PRIVATE },
+  target: {
+    server: Server.HTTPS_LOCAL,
+    behavior: {
+      preflight: PreflightBehavior.optionalSuccess(token()),
+      response: ResponseBehavior.allowCrossOrigin(),
+    },
+  },
+  expected: XhrTestResult.FAILURE,
+}), "private https to local: failure.");
+
+promise_test(t => xhrTest(t, {
+  source: { server: Server.HTTPS_PUBLIC },
+  target: {
+    server: Server.HTTPS_LOCAL,
+    behavior: {
+      preflight: PreflightBehavior.optionalSuccess(token()),
+      response: ResponseBehavior.allowCrossOrigin(),
+    },
+  },
+  expected: XhrTestResult.FAILURE,
+}), "public https to local: failure.");
+
+promise_test(t => xhrTest(t, {
+  source: { server: Server.HTTPS_PUBLIC },
+  target: {
+    server: Server.HTTPS_PRIVATE,
+    behavior: {
+      preflight: PreflightBehavior.optionalSuccess(token()),
+      response: ResponseBehavior.allowCrossOrigin(),
+    },
+  },
+  expected: XhrTestResult.FAILURE,
+}), "public https to private: failure.");
diff --git a/test/wpt/tests/fetch/range/blob.any.js b/test/wpt/tests/fetch/range/blob.any.js
new file mode 100644
index 00000000000..f3eb313b34b
--- /dev/null
+++ b/test/wpt/tests/fetch/range/blob.any.js
@@ -0,0 +1,197 @@
+// META: script=/common/utils.js
+
+const supportedBlobRange = [
+  {
+    name: "A simple blob range request.",
+    data: ["A simple Hello, World! example"],
+    type: "text/plain",
+    range: "bytes=9-21",
+    content_length: 13,
+    content_range: "bytes 9-21/30",
+    result: "Hello, World!",
+  },
+  {
+    name: "A blob range request with no end.",
+    data: ["Range with no end"],
+    type: "text/plain",
+    range: "bytes=11-",
+    content_length: 6,
+    content_range: "bytes 11-16/17",
+    result: "no end",
+  },
+  {
+    name: "A blob range request with no start.",
+    data: ["Range with no start"],
+    type: "text/plain",
+    range: "bytes=-8",
+    content_length: 8,
+    content_range: "bytes 11-18/19",
+    result: "no start",
+  },
+  {
+    name: "A simple blob range request with whitespace.",
+    data: ["A simple Hello, World! example"],
+    type: "text/plain",
+    range: "bytes= \t9-21",
+    content_length: 13,
+    content_range: "bytes 9-21/30",
+    result: "Hello, World!",
+  },
+  {
+    name: "Blob content with short content and a large range end",
+    data: ["Not much here"],
+    type: "text/plain",
+    range: "bytes=4-100000000000",
+    content_length: 9,
+    content_range: "bytes 4-12/13",
+    result: "much here",
+  },
+];
+
+const unsupportedBlobRange = [
+  {
+    name: "Blob range request with multiple range values",
+    data: ["Multiple ranges are not currently supported"],
+    type: "text/plain",
+    headers: {
+      "Range": "bytes=0-5,15-"
+    }
+  },
+  {
+    name: "Blob range request with multiple range values and whitespace",
+    data: ["Multiple ranges are not currently supported"],
+    type: "text/plain",
+    headers: {
+      "Range": "bytes=0-5, 15-"
+    }
+  },
+  {
+    name: "Blob range request with trailing comma",
+    data: ["Range with invalid trailing comma"],
+    type: "text/plain",
+    headers: {
+      "Range": "bytes=0-5,"
+    }
+  },
+  {
+    name: "Blob range with no start or end",
+    data: ["Range with no start or end"],
+    type: "text/plain",
+    headers: {
+      "Range": "bytes=-"
+    }
+  },
+  {
+    name: "Blob range with invalid whitespace in range #1",
+    data: ["Invalid whitespace #1"],
+    type: "text/plain",
+    headers: {
+      "Range": "bytes=5 - 10"
+    }
+  },
+  {
+    name: "Blob range with invalid whitespace in range #2",
+    data: ["Invalid whitespace #2"],
+    type: "text/plain",
+    headers: {
+      "Range": "bytes=-\t 5"
+    }
+  },
+  {
+    name: "Blob range request with short range end",
+    data: ["Range end should be greater than range start"],
+    type: "text/plain" ,
+    headers: {
+      "Range": "bytes=10-5"
+    }
+  },
+  {
+    name: "Blob range start should be an ASCII digit",
+    data: ["Range start must be an ASCII digit"],
+    type: "text/plain" ,
+    headers: {
+      "Range": "bytes=x-5"
+    }
+  },
+  {
+    name: "Blob range should have a dash",
+    data: ["Blob range should have a dash"],
+    type: "text/plain" ,
+    headers: {
+      "Range": "bytes=5"
+    }
+  },
+  {
+    name: "Blob range end should be an ASCII digit",
+    data: ["Range end must be an ASCII digit"],
+    type: "text/plain" ,
+    headers: {
+      "Range": "bytes=5-x"
+    }
+  },
+  {
+    name: "Blob range should include '-'",
+    data: ["Range end must include '-'"],
+    type: "text/plain" ,
+    headers: {
+      "Range": "bytes=x"
+    }
+  },
+  {
+    name: "Blob range should include '='",
+    data: ["Range end must include '='"],
+    type: "text/plain" ,
+    headers: {
+      "Range": "bytes 5-"
+    }
+  },
+  {
+    name: "Blob range should include 'bytes='",
+    data: ["Range end must include 'bytes='"],
+    type: "text/plain" ,
+    headers: {
+      "Range": "5-"
+    }
+  },
+  {
+    name: "Blob content with short content and a large range start",
+    data: ["Not much here"],
+    type: "text/plain",
+    headers: {
+      "Range": "bytes=100000-",
+    }
+  },
+];
+
+
+supportedBlobRange.forEach(({ name, data, type, range, content_length, content_range, result }) => {
+  promise_test(async () => {
+    let blob = new Blob(data, { "type" : type });
+    return fetch(URL.createObjectURL(blob), {
+      "method": "GET",
+      "headers": {
+        "Range": range
+      }
+    }).then(function(resp) {
+      assert_equals(resp.status, 206, "HTTP status is 206");
+      assert_equals(resp.type, "basic", "response type is basic");
+      assert_equals(resp.headers.get("Content-Type"), type, "Content-Type is " + resp.headers.get("Content-Type"));
+      assert_equals(resp.headers.get("Content-Length"), content_length.toString(), "Content-Length is " + resp.headers.get("Content-Length"));
+      assert_equals(resp.headers.get("Content-Range"), content_range, "Content-Range is " + resp.headers.get("Content-Range"));
+      return resp.text();
+    }).then(function(text) {
+      assert_equals(text, result, "Response's body is correct");
+    });
+  }, name);
+});
+
+unsupportedBlobRange.forEach(({ name, data, type, headers }) => {
+  promise_test(function(test) {
+    let blob = new Blob(data, { "type" : type });
+    let promise = fetch(URL.createObjectURL(blob), {
+      "method": "GET",
+      "headers": headers,
+    });
+    return promise_rejects_js(test, TypeError, promise);
+  }, name);
+});
diff --git a/test/wpt/tests/fetch/range/data.any.js b/test/wpt/tests/fetch/range/data.any.js
new file mode 100644
index 00000000000..22ef11e9317
--- /dev/null
+++ b/test/wpt/tests/fetch/range/data.any.js
@@ -0,0 +1,29 @@
+// META: script=/common/utils.js
+
+promise_test(async () => {
+  return fetch("data:text/plain;charset=US-ASCII,paddingHello%2C%20World%21padding", {
+    "method": "GET",
+    "Range": "bytes=13-26"
+  }).then(function(resp) {
+    assert_equals(resp.status, 200, "HTTP status is 200");
+    assert_equals(resp.type, "basic", "response type is basic");
+    assert_equals(resp.headers.get("Content-Type"), "text/plain;charset=US-ASCII", "Content-Type is " + resp.headers.get("Content-Type"));
+    return resp.text();
+  }).then(function(text) {
+    assert_equals(text, 'paddingHello, World!padding', "Response's body ignores range");
+  });
+}, "data: URL and Range header");
+
+promise_test(async () => {
+  return fetch("data:text/plain;charset=US-ASCII,paddingHello%2C%20paddingWorld%21padding", {
+    "method": "GET",
+    "Range": "bytes=7-14,21-27"
+  }).then(function(resp) {
+    assert_equals(resp.status, 200, "HTTP status is 200");
+    assert_equals(resp.type, "basic", "response type is basic");
+    assert_equals(resp.headers.get("Content-Type"), "text/plain;charset=US-ASCII", "Content-Type is " + resp.headers.get("Content-Type"));
+    return resp.text();
+  }).then(function(text) {
+    assert_equals(text, 'paddingHello, paddingWorld!padding', "Response's body ignores range");
+  });
+}, "data: URL and Range header with multiple ranges");
diff --git a/test/wpt/tests/fetch/range/general.any.js b/test/wpt/tests/fetch/range/general.any.js
new file mode 100644
index 00000000000..64b225a60bd
--- /dev/null
+++ b/test/wpt/tests/fetch/range/general.any.js
@@ -0,0 +1,140 @@
+// META: timeout=long
+// META: global=window,worker
+// META: script=/common/get-host-info.sub.js
+// META: script=/common/utils.js
+
+// Helpers that return headers objects with a particular guard
+function headersGuardNone(fill) {
+  if (fill) return new Headers(fill);
+  return new Headers();
+}
+
+function headersGuardResponse(fill) {
+  const opts = {};
+  if (fill) opts.headers = fill;
+  return new Response('', opts).headers;
+}
+
+function headersGuardRequest(fill) {
+  const opts = {};
+  if (fill) opts.headers = fill;
+  return new Request('./', opts).headers;
+}
+
+function headersGuardRequestNoCors(fill) {
+  const opts = { mode: 'no-cors' };
+  if (fill) opts.headers = fill;
+  return new Request('./', opts).headers;
+}
+
+const headerGuardTypes = [
+  ['none', headersGuardNone],
+  ['response', headersGuardResponse],
+  ['request', headersGuardRequest]
+];
+
+for (const [guardType, createHeaders] of headerGuardTypes) {
+  test(() => {
+    // There are three ways to set headers.
+    // Filling, appending, and setting. Test each:
+    let headers = createHeaders({ Range: 'foo' });
+    assert_equals(headers.get('Range'), 'foo');
+
+    headers = createHeaders();
+    headers.append('Range', 'foo');
+    assert_equals(headers.get('Range'), 'foo');
+
+    headers = createHeaders();
+    headers.set('Range', 'foo');
+    assert_equals(headers.get('Range'), 'foo');
+  }, `Range header setting allowed for guard type: ${guardType}`);
+}
+
+test(() => {
+  let headers = headersGuardRequestNoCors({ Range: 'foo' });
+  assert_false(headers.has('Range'));
+
+  headers = headersGuardRequestNoCors();
+  headers.append('Range', 'foo');
+  assert_false(headers.has('Range'));
+
+  headers = headersGuardRequestNoCors();
+  headers.set('Range', 'foo');
+  assert_false(headers.has('Range'));
+}, `Privileged header not allowed for guard type: request-no-cors`);
+
+promise_test(async () => {
+  const wavURL = new URL('resources/long-wav.py', location);
+  const stashTakeURL = new URL('resources/stash-take.py', location);
+
+  function changeToken() {
+    const stashToken = token();
+    wavURL.searchParams.set('accept-encoding-key', stashToken);
+    stashTakeURL.searchParams.set('key', stashToken);
+  }
+
+  const rangeHeaders = [
+    'bytes=0-10',
+    'foo=0-10',
+    'foo',
+    ''
+  ];
+
+  for (const rangeHeader of rangeHeaders) {
+    changeToken();
+
+    await fetch(wavURL, {
+      headers: { Range: rangeHeader }
+    });
+
+    const response = await fetch(stashTakeURL);
+
+    assert_regexp_match(await response.json(),
+                        /.*\bidentity\b.*/,
+                        `Expect identity accept-encoding if range header is ${JSON.stringify(rangeHeader)}`);
+  }
+}, `Fetch with range header will be sent with Accept-Encoding: identity`);
+
+promise_test(async () => {
+  const wavURL = new URL(get_host_info().HTTP_REMOTE_ORIGIN + '/fetch/range/resources/long-wav.py');
+  const stashTakeURL = new URL('resources/stash-take.py', location);
+
+  function changeToken() {
+    const stashToken = token();
+    wavURL.searchParams.set('accept-encoding-key', stashToken);
+    stashTakeURL.searchParams.set('key', stashToken);
+  }
+
+  const rangeHeaders = [
+    'bytes=10-9',
+    'bytes=-0',
+    'bytes=0000000000000000000000000000000000000000000000000000000000011-0000000000000000000000000000000000000000000000000000000000111',
+  ];
+
+  for (const rangeHeader of rangeHeaders) {
+    changeToken();
+    await fetch(wavURL, { headers: { Range : rangeHeader} }).then(() => { throw "loaded with range header " + rangeHeader }, () => { });
+  }
+}, `Cross Origin Fetch with non safe range header`);
+
+promise_test(async () => {
+  const wavURL = new URL(get_host_info().HTTP_REMOTE_ORIGIN + '/fetch/range/resources/long-wav.py');
+  const stashTakeURL = new URL('resources/stash-take.py', location);
+
+  function changeToken() {
+    const stashToken = token();
+    wavURL.searchParams.set('accept-encoding-key', stashToken);
+    stashTakeURL.searchParams.set('key', stashToken);
+  }
+
+  const rangeHeaders = [
+    'bytes=0-10',
+    'bytes=0-',
+    'bytes=00000000000000000000000000000000000000000000000000000000011-00000000000000000000000000000000000000000000000000000000000111',
+  ];
+
+  for (const rangeHeader of rangeHeaders) {
+    changeToken();
+    await fetch(wavURL, { headers: { Range: rangeHeader } }).then(() => { }, () => { throw "failed load with range header " + rangeHeader });
+  }
+}, `Cross Origin Fetch with safe range header`);
diff --git a/test/wpt/tests/fetch/range/general.window.js b/test/wpt/tests/fetch/range/general.window.js
new file mode 100644
index 00000000000..afe80d63a6b
--- /dev/null
+++ b/test/wpt/tests/fetch/range/general.window.js
@@ -0,0 +1,29 @@
+// META: script=resources/utils.js
+// META: script=/common/utils.js
+
+const onload = new Promise(r => window.addEventListener('load', r));
+
+// It's weird that browsers do this, but it should continue to work.
+promise_test(async t => {
+  await loadScript('resources/partial-script.py?pretend-offset=90000');
+  assert_true(self.scriptExecuted);
+}, `Script executed from partial response`);
+
+promise_test(async () => {
+  const wavURL = new URL('resources/long-wav.py', location);
+  const stashTakeURL = new URL('resources/stash-take.py', location);
+  const stashToken = token();
+  wavURL.searchParams.set('accept-encoding-key', stashToken);
+  stashTakeURL.searchParams.set('key', stashToken);
+
+  // The testing framework waits for window onload. If the audio element
+  // is appended before onload, it extends it, and the test times out.
+  await onload;
+
+  const audio = appendAudio(document, wavURL);
+  await new Promise(r => audio.addEventListener('progress', r));
+  audio.remove();
+
+  const response = await fetch(stashTakeURL);
+  assert_equals(await response.json(), 'identity', `Expect identity accept-encoding on media request`);
+}, `Fetch with range header will be sent with Accept-Encoding: identity`);
diff --git a/test/wpt/tests/fetch/range/non-matching-range-response.html b/test/wpt/tests/fetch/range/non-matching-range-response.html
new file mode 100644
index 00000000000..ba76c367661
--- /dev/null
+++ b/test/wpt/tests/fetch/range/non-matching-range-response.html
@@ -0,0 +1,34 @@
+<!DOCTYPE html>
+<meta name="timeout" content="long">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<body>
+<script>
+function range_rewrite_test(rewrites, expect, label) {
+    promise_test(async t => {
+        const url = new URL('resources/video-with-range.py', location.href);
+        const params = new URLSearchParams();
+        params.set('rewrites', JSON.stringify(rewrites));
+        url.search = params.toString();
+        const video = document.createElement('video');
+        video.autoplay = true;
+        video.muted = true;
+        video.src = url.toString();
+        const timeout = new Promise(resolve => t.step_timeout(() => resolve('timeout'), 10000));
+        const ok = new Promise(resolve => video.addEventListener('play', () => resolve('ok')));
+        t.add_cleanup(() => video.remove());
+        document.body.appendChild(video);
+        const result = await Promise.any([timeout, ok]);
+        assert_equals(result, 'ok');
+    }, `${label} should ${expect === 'ok' ? 'succeed' : 'fail'}`);
+}
+
+range_rewrite_test([], 'ok', 'Range requests with no rewrites');
+range_rewrite_test(
+    [
+        {request: ['0', '*'], response: [0, 100]},
+        {request: ['100', '*'], response: [50, 2000]}
+    ], 'ok', 'Range response out of range of request');
+range_rewrite_test([{request: ['0', '*'], status: 200}], 'ok', 'Range requests ignored (200 status)');
+</script>
+</body>
diff --git a/test/wpt/tests/fetch/range/resources/basic.html b/test/wpt/tests/fetch/range/resources/basic.html
new file mode 100644
index 00000000000..0e76edd65b7
--- /dev/null
+++ b/test/wpt/tests/fetch/range/resources/basic.html
@@ -0,0 +1 @@
+<!DOCTYPE html>
diff --git a/test/wpt/tests/fetch/range/resources/long-wav.py b/test/wpt/tests/fetch/range/resources/long-wav.py
new file mode 100644
index 00000000000..acfc81a7180
--- /dev/null
+++ b/test/wpt/tests/fetch/range/resources/long-wav.py
@@ -0,0 +1,134 @@
+"""
+This generates a 30 minute silent wav, and is capable of
+responding to Range requests.
+"""
+import time
+import re
+import struct
+
+from wptserve.utils import isomorphic_decode
+
+def create_wav_header(sample_rate, bit_depth, channels, duration):
+    bytes_per_sample = int(bit_depth / 8)
+    block_align = bytes_per_sample * channels
+    byte_rate = sample_rate * block_align
+    sub_chunk_2_size = duration * byte_rate
+
+    data = b''
+    # ChunkID
+    data += b'RIFF'
+    # ChunkSize
+    data += struct.pack('<L', 36 + sub_chunk_2_size)
+    # Format
+    data += b'WAVE'
+    # Subchunk1ID
+    data += b'fmt '
+    # Subchunk1Size
+    data += struct.pack('<L', 16)
+    # AudioFormat
+    data += struct.pack('<H', 1)
+    # NumChannels
+    data += struct.pack('<H', channels)
+    # SampleRate
+    data += struct.pack('<L', sample_rate)
+    # ByteRate
+    data += struct.pack('<L', byte_rate)
+    # BlockAlign
+    data += struct.pack('<H', block_align)
+    # BitsPerSample
+    data += struct.pack('<H', bit_depth)
+    # Subchunk2ID
+    data += b'data'
+    # Subchunk2Size
+    data += struct.pack('<L', sub_chunk_2_size)
+
+    return data
+
+
+def main(request, response):
+    if request.method == u"OPTIONS":
+        response.status = (404, b"Not Found")
+        response.headers.set(b"Content-Type", b"text/plain")
+        return b"Preflight not accepted"
+
+    response.headers.set(b"Content-Type", b"audio/wav")
+    response.headers.set(b"Accept-Ranges", b"bytes")
+    response.headers.set(b"Cache-Control", b"no-cache")
+    response.headers.set(b"Access-Control-Allow-Origin", request.headers.get(b'Origin', b''))
+
+    range_header = request.headers.get(b'Range', b'')
+    range_header_match = range_header and re.search(r'^bytes=(\d*)-(\d*)$', isomorphic_decode(range_header))
+    range_received_key = request.GET.first(b'range-received-key', b'')
+    accept_encoding_key = request.GET.first(b'accept-encoding-key', b'')
+
+    if range_received_key and range_header:
+        # Remove any current value
+        request.server.stash.take(range_received_key, b'/fetch/range/')
+        # This is later collected using stash-take.py
+        request.server.stash.put(range_received_key, u'range-header-received', b'/fetch/range/')
+
+    if accept_encoding_key:
+        # Remove any current value
+        request.server.stash.take(
+            accept_encoding_key,
+            b'/fetch/range/'
+        )
+        # This is later collected using stash-take.py
+        request.server.stash.put(
+            accept_encoding_key,
+            isomorphic_decode(request.headers.get(b'Accept-Encoding', b'')),
+            b'/fetch/range/'
+        )
+
+    # Audio details
+    sample_rate = 8000
+    bit_depth = 8
+    channels = 1
+    duration = 60 * 5
+
+    total_length = int((sample_rate * bit_depth * channels * duration) / 8)
+    bytes_remaining_to_send = total_length
+    initial_write = b''
+
+    if range_header_match:
+        response.status = 206
+        start, end = range_header_match.groups()
+
+        start = int(start)
+        end = int(end) if end else 0
+
+        if end:
+            bytes_remaining_to_send = (end + 1) - start
+        else:
+            bytes_remaining_to_send = total_length - start
+
+        wav_header = create_wav_header(sample_rate, bit_depth, channels, duration)
+
+        if start < len(wav_header):
+            initial_write = wav_header[start:]
+
+            if bytes_remaining_to_send < len(initial_write):
+                initial_write = initial_write[0:bytes_remaining_to_send]
+
+        content_range = b"bytes %d-%d/%d" % (start, end or total_length - 1, total_length)
+
+        response.headers.set(b"Content-Range", content_range)
+    else:
+        initial_write = create_wav_header(sample_rate, bit_depth, channels, duration)
+
+    response.headers.set(b"Content-Length", bytes_remaining_to_send)
+
+    response.write_status_headers()
+    response.writer.write(initial_write)
+
+    bytes_remaining_to_send -= len(initial_write)
+
+    while bytes_remaining_to_send > 0:
+        to_send = b'\x00' * min(bytes_remaining_to_send, sample_rate)
+        bytes_remaining_to_send -= len(to_send)
+
+        if not response.writer.write(to_send):
+            break
+
+        # Throttle the stream
+        time.sleep(0.5)
diff --git a/test/wpt/tests/fetch/range/resources/partial-script.py b/test/wpt/tests/fetch/range/resources/partial-script.py
new file mode 100644
index 00000000000..a9570ec355c
--- /dev/null
+++ b/test/wpt/tests/fetch/range/resources/partial-script.py
@@ -0,0 +1,29 @@
+"""
+This generates a partial response containing valid JavaScript.
+"""
+
+def main(request, response):
+    require_range = request.GET.first(b'require-range', b'')
+    pretend_offset = int(request.GET.first(b'pretend-offset', b'0'))
+    range_header = request.headers.get(b'Range', b'')
+
+    if require_range and not range_header:
+        response.set_error(412, u"Range header required")
+        response.write()
+        return
+
+    response.headers.set(b"Content-Type", b"text/plain")
+    response.headers.set(b"Accept-Ranges", b"bytes")
+    response.headers.set(b"Cache-Control", b"no-cache")
+    response.status = 206
+
+    to_send = b'self.scriptExecuted = true;'
+    length = len(to_send)
+
+    content_range = b"bytes %d-%d/%d" % (
+        pretend_offset, pretend_offset + length - 1, pretend_offset + length)
+
+    response.headers.set(b"Content-Range", content_range)
+    response.headers.set(b"Content-Length", length)
+
+    response.content = to_send
diff --git a/test/wpt/tests/fetch/range/resources/partial-text.py b/test/wpt/tests/fetch/range/resources/partial-text.py
new file mode 100644
index 00000000000..fa3d1171b68
--- /dev/null
+++ b/test/wpt/tests/fetch/range/resources/partial-text.py
@@ -0,0 +1,53 @@
+"""
+This generates a partial response for a 100-byte text file.
+"""
+import re
+
+from wptserve.utils import isomorphic_decode
+
+def main(request, response):
+    total_length = int(request.GET.first(b'length', b'100'))
+    partial_code = int(request.GET.first(b'partial', b'206'))
+    content_type = request.GET.first(b'type', b'text/plain')
+    range_header = request.headers.get(b'Range', b'')
+
+    # Send a 200 if there is no range request
+    if not range_header:
+        to_send = ''.zfill(total_length)
+        response.headers.set(b"Content-Type", content_type)
+        response.headers.set(b"Cache-Control", b"no-cache")
+        response.headers.set(b"Content-Length", total_length)
+        response.content = to_send
+        return
+
+    # Simple range parsing, requires specifically "bytes=xxx-xxxx"
+    range_header_match = re.search(r'^bytes=(\d*)-(\d*)$', isomorphic_decode(range_header))
+    start, end = range_header_match.groups()
+    start = int(start)
+    end = int(end) if end else total_length
+    length = end - start
+
+    # Error the request if the range goes beyond the length
+    if length <= 0 or end > total_length:
+        response.set_error(416, u"Range Not Satisfiable")
+        # set_error sets the MIME type to application/json, which - for a
+        # no-cors media request - will be blocked by ORB. We'll just force
+        # the expected MIME type here, whichfixes the test, but doesn't make
+        # sense in general.
+        response.headers = [(b"Content-Type", content_type)]
+        response.write()
+        return
+
+    # Generate a partial response of the requested length
+    to_send = ''.zfill(length)
+    response.headers.set(b"Content-Type", content_type)
+    response.headers.set(b"Accept-Ranges", b"bytes")
+    response.headers.set(b"Cache-Control", b"no-cache")
+    response.status = partial_code
+
+    content_range = b"bytes %d-%d/%d" % (start, end, total_length)
+
+    response.headers.set(b"Content-Range", content_range)
+    response.headers.set(b"Content-Length", length)
+
+    response.content = to_send
diff --git a/test/wpt/tests/fetch/range/resources/range-sw.js b/test/wpt/tests/fetch/range/resources/range-sw.js
new file mode 100644
index 00000000000..b47823f03b4
--- /dev/null
+++ b/test/wpt/tests/fetch/range/resources/range-sw.js
@@ -0,0 +1,218 @@
+importScripts('/resources/testharness.js');
+
+setup({ explicit_done: true });
+
+function assert_range_request(request, expectedRangeHeader, name) {
+  assert_equals(request.headers.get('Range'), expectedRangeHeader, name);
+}
+
+async function broadcast(msg) {
+  for (const client of await clients.matchAll()) {
+    client.postMessage(msg);
+  }
+}
+
+addEventListener('fetch', async event => {
+  /** @type Request */
+  const request = event.request;
+  const url = new URL(request.url);
+  const action = url.searchParams.get('action');
+
+  switch (action) {
+    case 'range-header-filter-test':
+      rangeHeaderFilterTest(request);
+      return;
+    case 'range-header-passthrough-test':
+      rangeHeaderPassthroughTest(event);
+      return;
+    case 'store-ranged-response':
+      storeRangedResponse(event);
+      return;
+    case 'use-stored-ranged-response':
+      useStoredRangeResponse(event);
+      return;
+    case 'broadcast-accept-encoding':
+      broadcastAcceptEncoding(event);
+      return;
+    case 'record-media-range-request':
+      return recordMediaRangeRequest(event);
+    case 'use-media-range-request':
+      useMediaRangeRequest(event);
+      return;
+  }
+});
+
+/**
+ * @param {Request} request
+ */
+function rangeHeaderFilterTest(request) {
+  const rangeValue = request.headers.get('Range');
+
+  test(() => {
+    assert_range_request(new Request(request), rangeValue, `Untampered`);
+    assert_range_request(new Request(request, {}), rangeValue, `Untampered (no init props set)`);
+    assert_range_request(new Request(request, { __foo: 'bar' }), rangeValue, `Untampered (only invalid props set)`);
+    assert_range_request(new Request(request, { mode: 'cors' }), rangeValue, `More permissive mode`);
+    assert_range_request(request.clone(), rangeValue, `Clone`);
+  }, "Range headers correctly preserved");
+
+  test(() => {
+    assert_range_request(new Request(request, { headers: { Range: 'foo' } }), null, `Tampered - range header set`);
+    assert_range_request(new Request(request, { headers: {} }), null, `Tampered - empty headers set`);
+    assert_range_request(new Request(request, { mode: 'no-cors' }), null, `Tampered – mode set`);
+    assert_range_request(new Request(request, { cache: 'no-cache' }), null, `Tampered – cache mode set`);
+  }, "Range headers correctly removed");
+
+  test(() => {
+    let headers;
+
+    headers = new Request(request).headers;
+    headers.delete('does-not-exist');
+    assert_equals(headers.get('Range'), rangeValue, `Preserved if no header actually removed`);
+
+    headers = new Request(request).headers;
+    headers.append('foo', 'bar');
+    assert_equals(headers.get('Range'), rangeValue, `Preserved if silent-failure on append (due to request-no-cors guard)`);
+
+    headers = new Request(request).headers;
+    headers.set('foo', 'bar');
+    assert_equals(headers.get('Range'), rangeValue, `Preserved if silent-failure on set (due to request-no-cors guard)`);
+
+    headers = new Request(request).headers;
+    headers.append('Range', 'foo');
+    assert_equals(headers.get('Range'), rangeValue, `Preserved if silent-failure on append (due to request-no-cors guard)`);
+
+    headers = new Request(request).headers;
+    headers.set('Range', 'foo');
+    assert_equals(headers.get('Range'), rangeValue, `Preserved if silent-failure on set (due to request-no-cors guard)`);
+
+    headers = new Request(request).headers;
+    headers.append('Accept', 'whatever');
+    assert_equals(headers.get('Range'), null, `Stripped if header successfully appended`);
+
+    headers = new Request(request).headers;
+    headers.set('Accept', 'whatever');
+    assert_equals(headers.get('Range'), null, `Stripped if header successfully set`);
+
+    headers = new Request(request).headers;
+    headers.delete('Accept');
+    assert_equals(headers.get('Range'), null, `Stripped if header successfully deleted`);
+
+    headers = new Request(request).headers;
+    headers.delete('Range');
+    assert_equals(headers.get('Range'), null, `Stripped if range header successfully deleted`);
+  }, "Headers correctly filtered");
+
+  done();
+}
+
+function rangeHeaderPassthroughTest(event) {
+  /** @type Request */
+  const request = event.request;
+  const url = new URL(request.url);
+  const key = url.searchParams.get('range-received-key');
+
+  event.waitUntil(new Promise(resolve => {
+    promise_test(async () => {
+      await fetch(event.request);
+      const response = await fetch('stash-take.py?key=' + key);
+      assert_equals(await response.json(), 'range-header-received');
+      resolve();
+    }, `Include range header in network request`);
+
+    done();
+  }));
+
+  // Just send back any response, it isn't important for the test.
+  event.respondWith(new Response(''));
+}
+
+let storedRangeResponseP;
+
+function storeRangedResponse(event) {
+  /** @type Request */
+  const request = event.request;
+  const id = new URL(request.url).searchParams.get('id');
+
+  storedRangeResponseP = fetch(event.request);
+  broadcast({ id });
+
+  // Just send back any response, it isn't important for the test.
+  event.respondWith(new Response(''));
+}
+
+function useStoredRangeResponse(event) {
+  event.respondWith(async function() {
+    const response = await storedRangeResponseP;
+    if (!response) throw Error("Expected stored range response");
+    return response.clone();
+  }());
+}
+
+function broadcastAcceptEncoding(event) {
+  /** @type Request */
+  const request = event.request;
+  const id = new URL(request.url).searchParams.get('id');
+
+  broadcast({
+    id,
+    acceptEncoding: request.headers.get('Accept-Encoding')
+  });
+
+  // Just send back any response, it isn't important for the test.
+  event.respondWith(new Response(''));
+}
+
+let rangeResponse = {};
+
+async function recordMediaRangeRequest(event) {
+  /** @type Request */
+  const request = event.request;
+  const url = new URL(request.url);
+  const urlParams = new URLSearchParams(url.search);
+  const size = urlParams.get("size");
+  const id = urlParams.get('id');
+  const key = 'size' + size;
+
+  if (key in rangeResponse) {
+    // Don't re-fetch ranges we already have.
+    const clonedResponse = rangeResponse[key].clone();
+    event.respondWith(clonedResponse);
+  } else if (event.request.headers.get("range") === "bytes=0-") {
+    // Generate a bogus 206 response to trigger subsequent range requests
+    // of the desired size.
+    const length = urlParams.get("length") + 100;
+    const body = "A".repeat(Number(size));
+    event.respondWith(new Response(body, {status: 206, headers: {
+      "Content-Type": "audio/mp4",
+      "Content-Range": `bytes 0-1/${length}`
+    }}));
+  } else if (event.request.headers.get("range") === `bytes=${Number(size)}-`) {
+    // Pass through actual range requests which will attempt to fetch up to the
+    // length in the original response which is bigger than the actual resource
+    // to make sure 206 and 416 responses are treated the same.
+    rangeResponse[key] = await fetch(event.request);
+
+    // Let the client know we have the range response for the given ID
+    broadcast({id});
+  } else {
+    event.respondWith(Promise.reject(Error("Invalid Request")));
+  }
+}
+
+function useMediaRangeRequest(event) {
+  /** @type Request */
+  const request = event.request;
+  const url = new URL(request.url);
+  const urlParams = new URLSearchParams(url.search);
+  const size = urlParams.get("size");
+  const key = 'size' + size;
+
+  // Send a clone of the range response to preload.
+  if (key in rangeResponse) {
+    const clonedResponse = rangeResponse[key].clone();
+    event.respondWith(clonedResponse);
+  } else {
+    event.respondWith(Promise.reject(Error("Invalid Request")));
+  }
+}
diff --git a/test/wpt/tests/fetch/range/resources/stash-take.py b/test/wpt/tests/fetch/range/resources/stash-take.py
new file mode 100644
index 00000000000..6cf6ff585bf
--- /dev/null
+++ b/test/wpt/tests/fetch/range/resources/stash-take.py
@@ -0,0 +1,7 @@
+from wptserve.handlers import json_handler
+
+
+@json_handler
+def main(request, response):
+    key = request.GET.first(b"key")
+    return request.server.stash.take(key, b'/fetch/range/')
diff --git a/test/wpt/tests/fetch/range/resources/utils.js b/test/wpt/tests/fetch/range/resources/utils.js
new file mode 100644
index 00000000000..ad2853b33dc
--- /dev/null
+++ b/test/wpt/tests/fetch/range/resources/utils.js
@@ -0,0 +1,36 @@
+function loadScript(url, { doc = document }={}) {
+  return new Promise((resolve, reject) => {
+    const script = doc.createElement('script');
+    script.onload = () => resolve();
+    script.onerror = () => reject(Error("Script load failed"));
+    script.src = url;
+    doc.body.appendChild(script);
+  })
+}
+
+function preloadImage(url, { doc = document }={}) {
+  return new Promise((resolve, reject) => {
+    const preload = doc.createElement('link');
+    preload.rel = 'preload';
+    preload.as = 'image';
+    preload.onload = () => resolve();
+    preload.onerror = () => resolve();
+    preload.href = url;
+    doc.body.appendChild(preload);
+  })
+}
+
+/**
+ *
+ * @param {Document} document
+ * @param {string|URL} url
+ * @returns {HTMLAudioElement}
+ */
+function appendAudio(document, url) {
+  const audio = document.createElement('audio');
+  audio.muted = true;
+  audio.src = url;
+  audio.preload = true;
+  document.body.appendChild(audio);
+  return audio;
+}
diff --git a/test/wpt/tests/fetch/range/resources/video-with-range.py b/test/wpt/tests/fetch/range/resources/video-with-range.py
new file mode 100644
index 00000000000..2d15ccf3c43
--- /dev/null
+++ b/test/wpt/tests/fetch/range/resources/video-with-range.py
@@ -0,0 +1,43 @@
+import re
+import os
+import json
+from wptserve.utils import isomorphic_decode
+
+def main(request, response):
+    path = os.path.join(request.doc_root, u"media", "sine440.mp3")
+    total_size = os.path.getsize(path)
+    rewrites = json.loads(request.GET.first(b'rewrites', '[]'))
+    range_header = request.headers.get(b'Range')
+    range_header_match = range_header and re.search(r'^bytes=(\d*)-(\d*)$', isomorphic_decode(range_header))
+    start = None
+    end = None
+    if range_header_match:
+        response.status = 206
+        start, end = range_header_match.groups()
+    if range_header:
+        status = 206
+    else:
+        status = 200
+    for rewrite in rewrites:
+        req_start, req_end = rewrite['request']
+        if start == req_start or req_start == '*':
+            if end == req_end or req_end == '*':
+                if 'response' in rewrite:
+                    start, end = rewrite['response']
+                if 'status' in rewrite:
+                    status = rewrite['status']
+
+    start = int(start or 0)
+    end = int(end or total_size)
+    headers = []
+    if status == 206:
+        headers.append((b"Content-Range", b"bytes %d-%d/%d" % (start, end - 1, total_size)))
+        headers.append((b"Accept-Ranges", b"bytes"))
+
+    headers.append((b"Content-Type", b"audio/mp3"))
+    headers.append((b"Content-Length", str(end - start)))
+    headers.append((b"Cache-Control", b"no-cache"))
+    video_file = open(path, "rb")
+    video_file.seek(start)
+    content = video_file.read(end)
+    return status, headers, content
diff --git a/test/wpt/tests/fetch/range/sw.https.window.js b/test/wpt/tests/fetch/range/sw.https.window.js
new file mode 100644
index 00000000000..62ad894da3d
--- /dev/null
+++ b/test/wpt/tests/fetch/range/sw.https.window.js
@@ -0,0 +1,228 @@
+// META: script=../../../service-workers/service-worker/resources/test-helpers.sub.js
+// META: script=/common/utils.js
+// META: script=/common/get-host-info.sub.js
+// META: script=resources/utils.js
+
+const { REMOTE_HOST } = get_host_info();
+const BASE_SCOPE = 'resources/basic.html?';
+
+async function cleanup() {
+  for (const iframe of document.querySelectorAll('.test-iframe')) {
+    iframe.parentNode.removeChild(iframe);
+  }
+
+  for (const reg of await navigator.serviceWorker.getRegistrations()) {
+    await reg.unregister();
+  }
+}
+
+async function setupRegistration(t, scope) {
+  await cleanup();
+  const reg = await navigator.serviceWorker.register('resources/range-sw.js', { scope });
+  await wait_for_state(t, reg.installing, 'activated');
+  return reg;
+}
+
+function awaitMessage(obj, id) {
+  return new Promise(resolve => {
+    obj.addEventListener('message', function listener(event) {
+      if (event.data.id !== id) return;
+      obj.removeEventListener('message', listener);
+      resolve(event.data);
+    });
+  });
+}
+
+promise_test(async t => {
+  const scope = BASE_SCOPE + Math.random();
+  const reg = await setupRegistration(t, scope);
+  const iframe = await with_iframe(scope);
+  const w = iframe.contentWindow;
+
+  // Trigger a cross-origin range request using media
+  const url = new URL('long-wav.py?action=range-header-filter-test', w.location);
+  url.hostname = REMOTE_HOST;
+  appendAudio(w.document, url);
+
+  // See rangeHeaderFilterTest in resources/range-sw.js
+  await fetch_tests_from_worker(reg.active);
+}, `Defer range header filter tests to service worker`);
+
+promise_test(async t => {
+  const scope = BASE_SCOPE + Math.random();
+  const reg = await setupRegistration(t, scope);
+  const iframe = await with_iframe(scope);
+  const w = iframe.contentWindow;
+
+  // Trigger a cross-origin range request using media
+  const url = new URL('long-wav.py', w.location);
+  url.searchParams.set('action', 'range-header-passthrough-test');
+  url.searchParams.set('range-received-key', token());
+  url.hostname = REMOTE_HOST;
+  appendAudio(w.document, url);
+
+  // See rangeHeaderPassthroughTest in resources/range-sw.js
+  await fetch_tests_from_worker(reg.active);
+}, `Defer range header passthrough tests to service worker`);
+
+promise_test(async t => {
+  const scope = BASE_SCOPE + Math.random();
+  await setupRegistration(t, scope);
+  const iframe = await with_iframe(scope);
+  const w = iframe.contentWindow;
+  const id = Math.random() + '';
+  const storedRangeResponse = awaitMessage(w.navigator.serviceWorker, id);
+
+  // Trigger a cross-origin range request using media
+  const url = new URL('partial-script.py', w.location);
+  url.searchParams.set('require-range', '1');
+  url.searchParams.set('action', 'store-ranged-response');
+  url.searchParams.set('id', id);
+  url.hostname = REMOTE_HOST;
+
+  appendAudio(w.document, url);
+
+  await storedRangeResponse;
+
+  // Fetching should reject
+  const fetchPromise = w.fetch('?action=use-stored-ranged-response', { mode: 'no-cors' });
+  await promise_rejects_js(t, w.TypeError, fetchPromise);
+
+  // Script loading should error too
+  const loadScriptPromise = loadScript('?action=use-stored-ranged-response', { doc: w.document });
+  await promise_rejects_js(t, Error, loadScriptPromise);
+
+  await loadScriptPromise.catch(() => {});
+
+  assert_false(!!w.scriptExecuted, `Partial response shouldn't be executed`);
+}, `Ranged response not allowed following no-cors ranged request`);
+
+promise_test(async t => {
+  const scope = BASE_SCOPE + Math.random();
+  await setupRegistration(t, scope);
+  const iframe = await with_iframe(scope);
+  const w = iframe.contentWindow;
+  const id = Math.random() + '';
+  const storedRangeResponse = awaitMessage(w.navigator.serviceWorker, id);
+
+  // Trigger a range request using media
+  const url = new URL('partial-script.py', w.location);
+  url.searchParams.set('require-range', '1');
+  url.searchParams.set('action', 'store-ranged-response');
+  url.searchParams.set('id', id);
+
+  appendAudio(w.document, url);
+
+  await storedRangeResponse;
+
+  // This should not throw
+  await w.fetch('?action=use-stored-ranged-response');
+
+  // This shouldn't throw either
+  await loadScript('?action=use-stored-ranged-response', { doc: w.document });
+
+  assert_true(w.scriptExecuted, `Partial response should be executed`);
+}, `Non-opaque ranged response executed`);
+
+promise_test(async t => {
+  const scope = BASE_SCOPE + Math.random();
+  await setupRegistration(t, scope);
+  const iframe = await with_iframe(scope);
+  const w = iframe.contentWindow;
+  const fetchId = Math.random() + '';
+  const fetchBroadcast = awaitMessage(w.navigator.serviceWorker, fetchId);
+  const audioId = Math.random() + '';
+  const audioBroadcast = awaitMessage(w.navigator.serviceWorker, audioId);
+
+  const url = new URL('long-wav.py', w.location);
+  url.searchParams.set('action', 'broadcast-accept-encoding');
+  url.searchParams.set('id', fetchId);
+
+  await w.fetch(url, {
+    headers: { Range: 'bytes=0-10' }
+  });
+
+  assert_equals((await fetchBroadcast).acceptEncoding, null, "Accept-Encoding should not be set for fetch");
+
+  url.searchParams.set('id', audioId);
+  appendAudio(w.document, url);
+
+  assert_equals((await audioBroadcast).acceptEncoding, null, "Accept-Encoding should not be set for media");
+}, `Accept-Encoding should not appear in a service worker`);
+
+promise_test(async t => {
+  const scope = BASE_SCOPE + Math.random();
+  await setupRegistration(t, scope);
+  const iframe = await with_iframe(scope);
+  const w = iframe.contentWindow;
+  const length = 100;
+  const count = 3;
+  const counts = {};
+
+  // test a single range request size
+  async function testSizedRange(size, partialResponseCode) {
+    const rangeId = Math.random() + '';
+    const rangeBroadcast = awaitMessage(w.navigator.serviceWorker, rangeId);
+
+    // Create a bogus audio element to trick the browser into sending
+    // cross-origin range requests that can be manipulated by the service worker.
+    const sound_url = new URL('partial-text.py', w.location);
+    sound_url.hostname = REMOTE_HOST;
+    sound_url.searchParams.set('action', 'record-media-range-request');
+    sound_url.searchParams.set('length', length);
+    sound_url.searchParams.set('size', size);
+    sound_url.searchParams.set('partial', partialResponseCode);
+    sound_url.searchParams.set('id', rangeId);
+    sound_url.searchParams.set('type', 'audio/mp4');
+    appendAudio(w.document, sound_url);
+
+    // wait for the range requests to happen
+    await rangeBroadcast;
+
+    // Create multiple preload requests and count the number of resource timing
+    // entries that get created to make sure 206 and 416 range responses are treated
+    // the same.
+    const url = new URL('partial-text.py', w.location);
+    url.searchParams.set('action', 'use-media-range-request');
+    url.searchParams.set('size', size);
+    url.searchParams.set('type', 'audio/mp4');
+    counts['size' + size] = 0;
+    for (let i = 0; i < count; i++) {
+      await preloadImage(url, { doc: w.document });
+    }
+  }
+
+  // Test range requests from 1 smaller than the correct size to 1 larger than
+  // the correct size to exercise the various permutations using the default 206
+  // response code for successful range requests.
+  for (let size = length - 1; size <= length + 1; size++) {
+    await testSizedRange(size, '206');
+  }
+
+  // Test a successful range request using a 200 response.
+  await testSizedRange(length - 2, '200');
+
+  // Check the resource timing entries and count the reported number of fetches of each type
+  const resources = w.performance.getEntriesByType("resource");
+  for (const entry of resources) {
+    const url = new URL(entry.name);
+    if (url.searchParams.has('action') &&
+        url.searchParams.get('action') == 'use-media-range-request' &&
+        url.searchParams.has('size')) {
+      counts['size' + url.searchParams.get('size')]++;
+    }
+  }
+
+  // Make sure there are a non-zero number of preload requests and they are all the same
+  let counts_valid = true;
+  const first = 'size' + (length - 2);
+  for (let size = length - 2; size <= length + 1; size++) {
+    let key = 'size' + size;
+    if (!(key in counts) || counts[key] <= 0 || counts[key] != counts[first]) {
+      counts_valid = false;
+      break;
+    }
+  }
+
+  assert_true(counts_valid, `Opaque range request preloads were different for error and success`);
+}, `Opaque range preload successes and failures should be indistinguishable`);
diff --git a/test/wpt/tests/fetch/redirect-navigate/302-found-post-handler.py b/test/wpt/tests/fetch/redirect-navigate/302-found-post-handler.py
new file mode 100644
index 00000000000..40a224f6565
--- /dev/null
+++ b/test/wpt/tests/fetch/redirect-navigate/302-found-post-handler.py
@@ -0,0 +1,15 @@
+from wptserve.utils import isomorphic_encode
+
+def main(request, response):
+    if request.method == u"POST":
+        response.add_required_headers = False
+        response.writer.write_status(302)
+        response.writer.write_header(b"Location", isomorphic_encode(request.url))
+        response.writer.end_headers()
+        response.writer.write(b"")
+    elif request.method == u"GET":
+        return ([(b"Content-Type", b"text/plain")],
+                b"OK")
+    else:
+        return ([(b"Content-Type", b"text/plain")],
+                b"FAIL")
\ No newline at end of file
diff --git a/test/wpt/tests/fetch/redirect-navigate/302-found-post.html b/test/wpt/tests/fetch/redirect-navigate/302-found-post.html
new file mode 100644
index 00000000000..854cd329a8f
--- /dev/null
+++ b/test/wpt/tests/fetch/redirect-navigate/302-found-post.html
@@ -0,0 +1,20 @@
+<!DOCTYPE html>
+<!-- Step 1: send POST request to a URL which will then 302 Found redirect -->
+<title>HTTP 302 Found POST Navigation Test</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script>
+async_test(function(t) {
+  window.addEventListener("load", function() {
+    var frame = document.getElementById("frame");
+    var link = new URL("302-found-post-handler.py", window.location.href);
+    frame.contentWindow.document.body.innerHTML = '<form action="' + link.href + '" method="POST" id="form"><input name="n"></form>';
+    frame.contentWindow.document.getElementById("form").submit();
+    frame.addEventListener("load", t.step_func_done(function() {
+      assert_equals(frame.contentWindow.document.body.textContent, "OK");
+    }));
+  });
+}, "HTTP 302 Found POST Navigation");
+</script>
+<body>
+<iframe id="frame" src="about:blank"></iframe>
diff --git a/test/wpt/tests/fetch/redirect-navigate/preserve-fragment.html b/test/wpt/tests/fetch/redirect-navigate/preserve-fragment.html
new file mode 100644
index 00000000000..682539a7445
--- /dev/null
+++ b/test/wpt/tests/fetch/redirect-navigate/preserve-fragment.html
@@ -0,0 +1,202 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="UTF-8">
+    <title>Ensure fragment is kept across redirects</title>
+    <meta name="timeout" content="long">
+    <link rel=help href="https://www.w3.org/TR/cuap/#uri">
+    <link rel=help href="https://tools.ietf.org/html/rfc7231#section-7.1.2">
+    <link rel=help href="https://bugs.webkit.org/show_bug.cgi?id=158420">
+    <link rel=help href="https://bugs.webkit.org/show_bug.cgi?id=24175">
+    <script src="/common/get-host-info.sub.js"></script>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <script>
+      let frame;
+      let message;
+
+      const HTTP_SAME_ORIGIN = "HTTP - SameOrigin";
+      const HTTPS_SAME_ORIGIN = "HTTPS - SameOrigin";
+      const HTTP_CROSS_ORIGIN = "HTTP - CrossOrigin";
+      const HTTPS_CROSS_ORIGIN = "HTTPS - CrossOrigin";
+
+      function messageReceived(f) {
+        return new Promise((resolve) => {
+          window.addEventListener("message", (e) => {
+            message = e.data;
+            resolve();
+          }, {once: true});
+          f();
+        });
+      }
+
+      function getHostname(navigation_type) {
+        switch (navigation_type) {
+          case HTTP_SAME_ORIGIN:
+            return get_host_info().HTTP_ORIGIN;
+          case HTTPS_SAME_ORIGIN:
+            return get_host_info().HTTPS_ORIGIN
+          case HTTP_CROSS_ORIGIN:
+            return get_host_info().HTTP_REMOTE_ORIGIN
+          case HTTPS_CROSS_ORIGIN:
+            return get_host_info().HTTPS_REMOTE_ORIGIN
+        }
+
+        return 'nonexistent'
+      }
+
+      // Turns |path| from a relative to this file path into a full URL, with
+      // the host being determined by one of the ORIGIN strings above.
+      function relativePathToFull(path,  navigation_type) {
+        let host = getHostname(navigation_type);
+
+        const pathname = window.location.pathname;
+        const base_path = pathname.substring(0, pathname.lastIndexOf('/') + 1);
+
+        return host + base_path + path;
+      }
+
+      // Constructs a URL to redirect.py which will respond with the given
+      // redirect status |code| to the provided |to_url|. Optionally adds on a
+      // |fragment|, if provided, to use in the initial request to redirect.py
+      function buildRedirectUrl(to_url, code, fragment) {
+        to_url = encodeURIComponent(to_url);
+        let dest = `/common/redirect.py?status=${code}&location=${to_url}`;
+        if (fragment)
+          dest = dest + '#' + fragment;
+        return dest;
+      }
+
+      async function redirectTo(url, code, navigation_type, fragment) {
+        const dest = buildRedirectUrl(url, code, fragment);
+        await messageReceived( () => {
+          frame.contentWindow.location = getHostname(navigation_type) + dest;
+        });
+      }
+
+      async function doubleRedirectTo(url, code, navigation_type, fragment, intermediate_fragment) {
+        const second_redirection = buildRedirectUrl(url, code, intermediate_fragment);
+        const first_redirection = buildRedirectUrl(second_redirection, code, fragment);
+        await messageReceived( () => {
+          frame.contentWindow.location = getHostname(navigation_type) + first_redirection;
+        });
+      }
+
+      onload = () => {
+        frame = document.getElementById("frame");
+
+        // The tests in this file verify fragments are correctly propagated in
+        // a number of HTTP redirect scenarios. Each test is run for every
+        // relevant redirect status code. We also run each scenario under each
+        // combination of navigating to cross/same origin and using http/https.
+        const status_codes = [301, 302, 303, 307, 308];
+        const navigation_types = [HTTP_SAME_ORIGIN,
+                                  HTTPS_SAME_ORIGIN,
+                                  HTTP_CROSS_ORIGIN,
+                                  HTTPS_CROSS_ORIGIN];
+
+        for (let navigation_type of navigation_types) {
+          // Navigate to a URL with a fragment. The URL redirects to a different
+          // page. Ensure we land on the redirected page with the fragment
+          // specified in the initial navigation's URL.
+          //
+          // Redirect chain: urlA#target -> urlB
+          //
+          for (let code of status_codes) {
+            promise_test(async () => {
+              const to_url = relativePathToFull('resources/destination.html', navigation_type);
+              await redirectTo(to_url, code, navigation_type, "target");
+              assert_true(message.url.endsWith('#target'));
+              assert_equals(message.scrollY, 2000, "scrolls to fragment from initial navigation.");
+            }, `[${navigation_type}] Preserve fragment in ${code} redirect`);
+          }
+
+          // Navigate to a URL with a fragment. The URL redirects to a different
+          // URL that also contains a fragment. Ensure we land on the redirected
+          // page using the fragment specified in the redirect response and not
+          // the one in the initial navigation.
+          //
+          // Redirect chain: urlA#target -> urlB#fromRedirect
+          //
+          for (let code of status_codes) {
+            promise_test(async () => {
+              const to_url = relativePathToFull('resources/destination.html#fromRedirect', navigation_type);
+              await redirectTo(to_url, code, navigation_type, "target");
+              assert_true(message.url.endsWith('#fromRedirect'), `Unexpected fragment: ${message.url}`);
+              assert_equals(message.scrollY, 4000, "scrolls to fragment from redirect.");
+            }, `[${navigation_type}] Redirect URL fragment takes precedence in ${code} redirect`);
+          }
+
+          // Perform two redirects. The initial navigation has a fragment and
+          // will redirect to a URL that also responds with a redirect. Ensure we
+          // land on the final page with the fragment from the original
+          // navigation.
+          //
+          // Redirect chain: urlA#target -> urlB -> urlC
+          //
+          for (let code of status_codes) {
+            promise_test(async () => {
+              const to_url = relativePathToFull('resources/destination.html', navigation_type);
+              await doubleRedirectTo(to_url, code, navigation_type, "target");
+              assert_true(message.url.endsWith('#target'), `Unexpected fragment: ${message.url}`);
+              assert_equals(message.scrollY, 2000, "scrolls to fragment from initial navigation.");
+            }, `[${navigation_type}] Preserve fragment in multiple ${code} redirects`);
+          }
+
+          // Perform two redirects. The initial navigation has a fragment and
+          // will redirect to a URL that also responds with a redirect. The
+          // second redirection to the final page also has a fragment. Ensure we
+          // land on the final page with the fragment from the redirection
+          // response URL.
+          //
+          // Redirect chain: urlA#target -> urlB -> urlC#fromRedirect
+          //
+          for (let code of status_codes) {
+            promise_test(async () => {
+              const to_url = relativePathToFull('resources/destination.html#fromRedirect', navigation_type);
+              await doubleRedirectTo(to_url, code, navigation_type, "target");
+              assert_true(message.url.endsWith('#fromRedirect'), `Unexpected fragment: ${message.url}`);
+              assert_equals(message.scrollY, 4000, "scrolls to fragment from redirect.");
+            }, `[${navigation_type}] Destination URL fragment takes precedence in multiple ${code} redirects`);
+          }
+
+          // Perform two redirects. The initial navigation has a fragment and
+          // will redirect to a URL that also responds with a redirect. This
+          // time, both redirect response have a fragment. Ensure we land on the
+          // final page with the fragment from the last redirection response URL.
+          //
+          // Redirect chain: urlA#target -> urlB#intermediate -> urlC#fromRedirect
+          //
+          for (let code of status_codes) {
+            promise_test(async () => {
+              const to_url = relativePathToFull('resources/destination.html#fromRedirect', navigation_type);
+              await doubleRedirectTo(to_url, code, navigation_type, "target", "intermediate");
+              assert_true(message.url.endsWith('#fromRedirect'), `Unexpected fragment: ${message.url}`);
+              assert_equals(message.scrollY, 4000, "scrolls to fragment from redirect.");
+            }, `[${navigation_type}] Final redirect fragment takes precedence over intermediate in multiple ${code} redirects`);
+          }
+
+          // Perform two redirects. The initial navigation has a fragment and
+          // will redirect to a URL that also responds with a redirect. The first
+          // redirect response has a fragment but the second doesn't. Ensure we
+          // land on the final page with the fragment from the first redirection
+          // response URL.
+          //
+          // Redirect chain: urlA#target -> urlB#fromRedirect -> urlC
+          //
+          for (let code of status_codes) {
+            promise_test(async () => {
+              const to_url = relativePathToFull('resources/destination.html', navigation_type);
+              await doubleRedirectTo(to_url, code, navigation_type, "target", "fromRedirect");
+              assert_true(message.url.endsWith('#fromRedirect'), `Unexpected fragment: ${message.url}`);
+              assert_equals(message.scrollY, 4000, "scrolls to fragment from redirect.");
+            }, `[${navigation_type}] Preserve intermediate fragment in multiple ${code} redirects`);
+          }
+        }
+      }
+    </script>
+  </head>
+  <body>
+    <iframe id="frame" src=""></iframe>
+  </body>
+</html>
diff --git a/test/wpt/tests/fetch/redirect-navigate/resources/destination.html b/test/wpt/tests/fetch/redirect-navigate/resources/destination.html
new file mode 100644
index 00000000000..f98c5a8cd77
--- /dev/null
+++ b/test/wpt/tests/fetch/redirect-navigate/resources/destination.html
@@ -0,0 +1,28 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="UTF-8">
+    <style>
+      body {
+        height: 10000px;
+        margin: 0;
+      }
+      p {
+        position: absolute;
+        margin: 0;
+      }
+    </style>
+    <script>
+      window.onload = () => {
+        window.parent.postMessage({
+          url: window.location.toString(),
+          scrollY: window.scrollY
+        }, "*");
+      }
+    </script>
+  </head>
+  <body>
+    <p style="top: 2000px" id="target">Target</p>
+    <p style="top: 4000px" id="fromRedirect">Target</p>
+  </body>
+</html>
diff --git a/test/wpt/tests/fetch/redirects/data.window.js b/test/wpt/tests/fetch/redirects/data.window.js
new file mode 100644
index 00000000000..eeb41966b44
--- /dev/null
+++ b/test/wpt/tests/fetch/redirects/data.window.js
@@ -0,0 +1,25 @@
+// See ../api/redirect/redirect-to-dataurl.any.js for fetch() tests
+
+async_test(t => {
+  const img = document.createElement("img");
+  img.onload = t.unreached_func();
+  img.onerror = t.step_func_done();
+  img.src = "../api/resources/redirect.py?location=data:image/png%3Bbase64,iVBORw0KGgoAAAANSUhEUgAAAIUAAABqCAIAAAAdqgU8AAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAAF6SURBVHhe7dNBDQAADIPA%2Bje92eBxSQUQSLedlQzo0TLQonFWPVoGWjT%2BoUfLQIvGP/RoGWjR%2BIceLQMtGv/Qo2WgReMferQMtGj8Q4%2BWgRaNf%2BjRMtCi8Q89WgZaNP6hR8tAi8Y/9GgZaNH4hx4tAy0a/9CjZaBF4x96tAy0aPxDj5aBFo1/6NEy0KLxDz1aBlo0/qFHy0CLxj/0aBlo0fiHHi0DLRr/0KNloEXjH3q0DLRo/EOPloEWjX/o0TLQovEPPVoGWjT%2BoUfLQIvGP/RoGWjR%2BIceLQMtGv/Qo2WgReMferQMtGj8Q4%2BWgRaNf%2BjRMtCi8Q89WgZaNP6hR8tAi8Y/9GgZaNH4hx4tAy0a/9CjZaBF4x96tAy0aPxDj5aBFo1/6NEy0KLxDz1aBlo0/qFHy0CLxj/0aBlo0fiHHi0DLRr/0KNloEXjH3q0DLRo/EOPloEWjX/o0TLQovEPPVoGWjT%2BoUfLQIvGP/RoGWjR%2BIceJQMPIOzeGc0PIDEAAAAASUVORK5CYII";
+}, "<img> fetch that redirects to data: URL");
+
+globalThis.globalTest = null;
+async_test(t => {
+  globalThis.globalTest = t;
+  const script = document.createElement("script");
+  script.src = "../api/resources/redirect.py?location=data:text/javascript,(globalThis.globalTest.unreached_func())()";
+  script.onerror = t.step_func_done();
+  document.body.append(script);
+}, "<script> fetch that redirects to data: URL");
+
+async_test(t => {
+  const client = new XMLHttpRequest();
+  client.open("GET", "../api/resources/redirect.py?location=data:,");
+  client.send();
+  client.onload = t.unreached_func();
+  client.onerror = t.step_func_done();
+}, "XMLHttpRequest fetch that redirects to data: URL");
diff --git a/test/wpt/tests/fetch/redirects/subresource-fragments.html b/test/wpt/tests/fetch/redirects/subresource-fragments.html
new file mode 100644
index 00000000000..0bd74d7bfbc
--- /dev/null
+++ b/test/wpt/tests/fetch/redirects/subresource-fragments.html
@@ -0,0 +1,39 @@
+<!doctype html>
+<meta charset=utf-8>
+<title>Subresources and fragment preservation</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=/html/canvas/resources/canvas-tests.js></script>
+<div id=log></div>
+<!--
+  The source image is 50h x 100w and its color depends on the fragment.
+
+  This image is then drawn on a 50h x 100w transparent black canvas.
+-->
+<img data-desc="Control"
+     src="/images/colors.svg#green">
+<img data-desc="Redirect with the original URL containing a fragment"
+     src="../api/resources/redirect.py?simple&location=/images/colors.svg#green">
+<img data-desc="Redirect with the response Location header containing a fragment"
+     src="../api/resources/redirect.py?simple&location=/images/colors.svg%23green">
+<img data-desc="Redirect with both the original URL and response Location header containing a fragment"
+     src="../api/resources/redirect.py?simple&location=/images/colors.svg%23green#red">
+<canvas width=100 height=50></canvas>
+<script>
+setup({ explicit_done:true });
+onload = () => {
+  const canvas = document.querySelector("canvas");
+  const ctx = canvas.getContext("2d");
+  document.querySelectorAll("img").forEach(img => {
+    test(t => {
+      t.add_cleanup(() => {
+        ctx.clearRect(0, 0, 100, 50);
+      });
+      ctx.drawImage(img, 0, 0);
+      // canvas, pixelX, pixelY, r, g, b, alpha, ?, ?, tolerance
+      _assertPixelApprox(canvas, 40, 40, 0, 255, 0, 255, 4);
+    }, img.dataset.desc);
+  });
+  done();
+};
+</script>
diff --git a/test/wpt/tests/fetch/security/1xx-response.any.js b/test/wpt/tests/fetch/security/1xx-response.any.js
new file mode 100644
index 00000000000..df4dafcd80b
--- /dev/null
+++ b/test/wpt/tests/fetch/security/1xx-response.any.js
@@ -0,0 +1,28 @@
+promise_test(async (t) => {
+  // The 100 response should be ignored, then the transaction ends, which
+  // should lead to an error.
+  await promise_rejects_js(
+    t, TypeError, fetch('/common/text-plain.txt?pipe=status(100)'));
+}, 'Status(100) should be ignored.');
+
+// This behavior is being discussed at https://github.com/whatwg/fetch/issues/1397.
+promise_test(async (t) => {
+  const res = await fetch('/common/text-plain.txt?pipe=status(101)');
+  assert_equals(res.status, 101);
+  const body = await res.text();
+  assert_equals(body, '');
+}, 'Status(101) should be accepted, with removing body.');
+
+promise_test(async (t) => {
+  // The 103 response should be ignored, then the transaction ends, which
+  // should lead to an error.
+  await promise_rejects_js(
+     t, TypeError, fetch('/common/text-plain.txt?pipe=status(103)'));
+}, 'Status(103) should be ignored.');
+
+promise_test(async (t) => {
+  // The 199 response should be ignored, then the transaction ends, which
+  // should lead to an error.
+  await promise_rejects_js(
+    t, TypeError, fetch('/common/text-plain.txt?pipe=status(199)'));
+}, 'Status(199) should be ignored.');
diff --git a/test/wpt/tests/fetch/security/dangling-markup-mitigation-data-url.tentative.sub.html b/test/wpt/tests/fetch/security/dangling-markup-mitigation-data-url.tentative.sub.html
new file mode 100644
index 00000000000..f27735daa1d
--- /dev/null
+++ b/test/wpt/tests/fetch/security/dangling-markup-mitigation-data-url.tentative.sub.html
@@ -0,0 +1,229 @@
+<!DOCTYPE html>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<body>
+<script>
+  function readableURL(url) {
+    return url.replace(/\n/g, "\\n").replace(/\r/g, "\\r").replace(/\t/g, "\\t");
+  }
+
+  // For each of the following tests, we'll inject a frame containing the HTML we'd like to poke at
+  // as a `srcdoc` attribute. Because we're injecting markup via `srcdoc`, we need to entity-escape
+  // the content we'd like to treat as "raw" (e.g. `\n` => `&#10;`, `<` => `&lt;`), and
+  // double-escape the "escaped" content.
+  var rawBrace = "&lt;";
+  var escapedBrace = "&amp;lt;";
+  var doubleEscapedBrace = "&amp;amp;lt;";
+  var rawNewline = "&#10;";
+  var escapedNewline = "&amp;#10;";
+  // doubleEscapedNewline is used inside a data URI, and so must have its '#' escaped.
+  var doubleEscapedNewline = "&amp;amp;%2310;";
+
+  function appendFrameAndGetElement(test, frame) {
+    return new Promise((resolve, reject) => {
+      frame.onload = test.step_func(_ => {
+        frame.onload = null;
+        resolve(frame.contentDocument.querySelector('#dangling'));
+      });
+      document.body.appendChild(frame);
+    });
+  }
+
+  function assert_img_loaded(test, frame) {
+    appendFrameAndGetElement(test, frame)
+      .then(test.step_func_done(img => {
+        assert_equals(img.naturalHeight, 1, "Height");
+        frame.remove();
+      }));
+  }
+
+  function assert_img_not_loaded(test, frame) {
+    appendFrameAndGetElement(test, frame)
+      .then(test.step_func_done(img => {
+        assert_equals(img.naturalHeight, 0, "Height");
+        assert_equals(img.naturalWidth, 0, "Width");
+      }));
+  }
+
+  function assert_nested_img_not_loaded(test, frame) {
+    window.addEventListener('message', test.step_func(e => {
+      if (e.source != frame.contentWindow)
+        return;
+
+      assert_equals(e.data, 'error');
+      test.done();
+    }));
+    appendFrameAndGetElement(test, frame);
+  }
+
+  function assert_nested_img_loaded(test, frame) {
+    window.addEventListener('message', test.step_func(e => {
+      if (e.source != frame.contentWindow)
+        return;
+
+      assert_equals(e.data, 'loaded');
+      test.done();
+    }));
+    appendFrameAndGetElement(test, frame);
+  }
+
+  function createFrame(markup) {
+    var i = document.createElement('iframe');
+    i.srcdoc = `${markup}sekrit`;
+    return i;
+  }
+
+  // Subresource requests:
+  [
+    // Data URLs don't themselves trigger blocking:
+    `<img id="dangling" src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mNkYAAAAAYAAjCB0C8AAAAASUVORK5CYII=">`,
+    `<img id="dangling" src="data:image/png;base64,${rawNewline}iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mNkYAAAAAYAAjCB0C8AAAAASUVORK5CYII=">`,
+    `<img id="dangling" src="data:image/png;base64,i${rawNewline}VBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mNkYAAAAAYAAjCB0C8AAAAASUVORK5CYII=">`,
+
+    // Data URLs with visual structure don't trigger blocking
+    `<img id="dangling" src="data:image/svg+xml;utf8,
+      <svg width='1' height='1' xmlns='http://www.w3.org/2000/svg'>
+        <rect width='100%' height='100%' fill='rebeccapurple'/>
+        <rect x='10%' y='10%' width='80%' height='80%' fill='lightgreen'/>
+      </svg>">`
+  ].forEach(markup => {
+    async_test(t => {
+      var i = createFrame(`${markup} <element attr="" another=''>`);
+      assert_img_loaded(t, i);
+    }, readableURL(markup));
+  });
+
+  // Nested subresource requests:
+  //
+  // The following tests load a given HTML string into `<iframe srcdoc="...">`, so we'll
+  // end up with a frame with an ID of `dangling` inside the srcdoc frame. That frame's
+  // `src` is a `data:` URL that resolves to an HTML document containing an `<img>`. The
+  // error/load handlers on that image are piped back up to the top-level document to
+  // determine whether the tests' expectations were met. *phew*
+
+  // Allowed:
+  [
+     // Just a newline:
+     `<iframe id="dangling"
+        src="data:text/html,
+            <img
+              onload='window.parent.postMessage(&quot;loaded&quot;, &quot;*&quot;);'
+              onerror='window.parent.postMessage(&quot;error&quot;, &quot;*&quot;);'
+              src='http://{{host}}:{{ports[http][0]}}/images/gr${rawNewline}een-256x256.png'>
+        ">
+     </iframe>`,
+
+     // Just a brace:
+     `<iframe id="dangling"
+        src="data:text/html,
+            <img
+              onload='window.parent.postMessage(&quot;loaded&quot;, &quot;*&quot;);'
+              onerror='window.parent.postMessage(&quot;error&quot;, &quot;*&quot;);'
+              src='http://{{host}}:{{ports[http][0]}}/images/green-256x256.png?${rawBrace}'>
+        ">
+     </iframe>`,
+
+     // Newline and escaped brace.
+     `<iframe id="dangling"
+        src="data:text/html,
+            <img
+              onload='window.parent.postMessage(&quot;loaded&quot;, &quot;*&quot;);'
+              onerror='window.parent.postMessage(&quot;error&quot;, &quot;*&quot;);'
+              src='http://{{host}}:{{ports[http][0]}}/images/gr${rawNewline}een-256x256.png?${doubleEscapedBrace}'>
+        ">
+     </iframe>`,
+
+     // Brace and escaped newline:
+     `<iframe id="dangling"
+        src="data:text/html,
+            <img
+              onload='window.parent.postMessage(&quot;loaded&quot;, &quot;*&quot;);'
+              onerror='window.parent.postMessage(&quot;error&quot;, &quot;*&quot;);'
+              src='http://{{host}}:{{ports[http][0]}}/images/green-256x256.png?${doubleEscapedNewline}${rawBrace}'>
+        ">
+     </iframe>`,
+  ].forEach(markup => {
+    async_test(t => {
+      var i = createFrame(`
+        <script>
+          // Repeat the message so that the parent can track this frame as the source.
+          window.onmessage = e => window.parent.postMessage(e.data, '*');
+        </scr`+`ipt>
+        ${markup}
+      `);
+      assert_nested_img_loaded(t, i);
+    }, readableURL(markup));
+  });
+
+  // Nested requests that should fail:
+  [
+     // Newline and brace:
+     `<iframe id="dangling"
+        src="data:text/html,
+            <img
+              onload='window.parent.postMessage(&quot;loaded&quot;, &quot;*&quot;);'
+              onerror='window.parent.postMessage(&quot;error&quot;, &quot;*&quot;);'
+              src='http://{{host}}:{{ports[http][0]}}/images/gr${rawNewline}een-256x256.png?${rawBrace}'>
+        ">
+     </iframe>`,
+
+     // Leading whitespace:
+     `<iframe id="dangling"
+        src="     data:text/html,
+            <img
+              onload='window.parent.postMessage(&quot;loaded&quot;, &quot;*&quot;);'
+              onerror='window.parent.postMessage(&quot;error&quot;, &quot;*&quot;);'
+              src='http://{{host}}:{{ports[http][0]}}/images/gr${rawNewline}een-256x256.png?${rawBrace}'>
+        ">
+     </iframe>`,
+
+     // Leading newline:
+     `<iframe id="dangling"
+        src="\ndata:text/html,
+            <img
+              onload='window.parent.postMessage(&quot;loaded&quot;, &quot;*&quot;);'
+              onerror='window.parent.postMessage(&quot;error&quot;, &quot;*&quot;);'
+              src='http://{{host}}:{{ports[http][0]}}/images/gr${rawNewline}een-256x256.png?${rawBrace}'>
+        ">
+     </iframe>`,
+     `<iframe id="dangling"
+        src="${rawNewline}data:text/html,
+            <img
+              onload='window.parent.postMessage(&quot;loaded&quot;, &quot;*&quot;);'
+              onerror='window.parent.postMessage(&quot;error&quot;, &quot;*&quot;);'
+              src='http://{{host}}:{{ports[http][0]}}/images/gr${rawNewline}een-256x256.png?${rawBrace}'>
+        ">
+     </iframe>`,
+
+     // Leading tab:
+     `<iframe id="dangling"
+        src="\tdata:text/html,
+            <img
+              onload='window.parent.postMessage(&quot;loaded&quot;, &quot;*&quot;);'
+              onerror='window.parent.postMessage(&quot;error&quot;, &quot;*&quot;);'
+              src='http://{{host}}:{{ports[http][0]}}/images/gr${rawNewline}een-256x256.png?${rawBrace}'>
+        ">
+     </iframe>`,
+
+     // Leading carrige return:
+     `<iframe id="dangling"
+        src="\rdata:text/html,
+            <img
+              onload='window.parent.postMessage(&quot;loaded&quot;, &quot;*&quot;);'
+              onerror='window.parent.postMessage(&quot;error&quot;, &quot;*&quot;);'
+              src='http://{{host}}:{{ports[http][0]}}/images/gr${rawNewline}een-256x256.png?${rawBrace}'>
+        ">
+     </iframe>`,
+  ].forEach(markup => {
+    async_test(t => {
+      var i = createFrame(`
+        <script>
+          // Repeat the message so that the parent can track this frame as the source.
+          window.onmessage = e => window.parent.postMessage(e.data, '*');
+        </scr`+`ipt>
+        ${markup}
+      `);
+      assert_nested_img_not_loaded(t, i);
+    }, readableURL(markup));
+  });
+</script>
diff --git a/test/wpt/tests/fetch/security/dangling-markup-mitigation.tentative.html b/test/wpt/tests/fetch/security/dangling-markup-mitigation.tentative.html
new file mode 100644
index 00000000000..61a931608ba
--- /dev/null
+++ b/test/wpt/tests/fetch/security/dangling-markup-mitigation.tentative.html
@@ -0,0 +1,147 @@
+<!DOCTYPE html>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<body>
+<script>
+  function readableURL(url) {
+    return url.replace(/\n/g, "\\n").replace(/\r/g, "\\r").replace(/\t/g, "\\t");
+  }
+
+  var should_load = [
+    `/images/green-1x1.png`,
+    `/images/gre\nen-1x1.png`,
+    `/images/gre\ten-1x1.png`,
+    `/images/gre\ren-1x1.png`,
+    `/images/green-1x1.png?img=<`,
+    `/images/green-1x1.png?img=&lt;`,
+    `/images/green-1x1.png?img=%3C`,
+    `/images/gr\neen-1x1.png?img=%3C`,
+    `/images/gr\reen-1x1.png?img=%3C`,
+    `/images/gr\teen-1x1.png?img=%3C`,
+    `/images/green-1x1.png?img=&#10;`,
+    `/images/gr\neen-1x1.png?img=&#10;`,
+    `/images/gr\reen-1x1.png?img=&#10;`,
+    `/images/gr\teen-1x1.png?img=&#10;`,
+  ];
+  should_load.forEach(url => async_test(t => {
+    fetch(url)
+      .then(t.step_func_done(r => {
+        assert_equals(r.status, 200);
+      }))
+      .catch(t.unreached_func("Fetch should succeed."));
+  }, "Fetch: " + readableURL(url)));
+
+  var should_block = [
+    `/images/gre\nen-1x1.png?img=<`,
+    `/images/gre\ren-1x1.png?img=<`,
+    `/images/gre\ten-1x1.png?img=<`,
+    `/images/green-1x1.png?<\n=block`,
+    `/images/green-1x1.png?<\r=block`,
+    `/images/green-1x1.png?<\t=block`,
+  ];
+  should_block.forEach(url => async_test(t => {
+    fetch(url)
+      .then(t.unreached_func("Fetch should fail."))
+      .catch(t.step_func_done());
+  }, "Fetch: " + readableURL(url)));
+
+
+  // For each of the following tests, we'll inject a frame containing the HTML we'd like to poke at
+  // as a `srcdoc` attribute. Because we're injecting markup via `srcdoc`, we need to entity-escape
+  // the content we'd like to treat as "raw" (e.g. `\n` => `&#10;`, `<` => `&lt;`), and
+  // double-escape the "escaped" content.
+  var rawBrace = "&lt;";
+  var escapedBrace = "&amp;lt;";
+  var rawNewline = "&#10;";
+  var escapedNewline = "&amp;#10;";
+
+  function appendFrameAndGetElement(test, frame) {
+    return new Promise((resolve, reject) => {
+      frame.onload = test.step_func(_ => {
+        frame.onload = null;
+        resolve(frame.contentDocument.querySelector('#dangling'));
+      });
+      document.body.appendChild(frame);
+    });
+  }
+
+  function assert_img_loaded(test, frame) {
+    appendFrameAndGetElement(test, frame)
+      .then(test.step_func_done(img => {
+        assert_equals(img.naturalHeight, 1, "Height");
+        frame.remove();
+      }));
+  }
+
+  function assert_img_not_loaded(test, frame) {
+    appendFrameAndGetElement(test, frame)
+      .then(test.step_func_done(img => {
+        assert_equals(img.naturalHeight, 0, "Height");
+        assert_equals(img.naturalWidth, 0, "Width");
+      }));
+  }
+
+  function createFrame(markup) {
+    var i = document.createElement('iframe');
+    i.srcdoc = `${markup}sekrit`;
+    return i;
+  }
+
+  // The following resources should not be blocked, as their URLs do not contain both a `\n` and `<`
+  // character in the body of the URL.
+  var should_load = [
+    // Brace alone doesn't block:
+    `<img id="dangling" src="/images/green-1x1.png?img=${rawBrace}b">`,
+
+    // Newline alone doesn't block:
+    `<img id="dangling" src="/images/green-1x1.png?img=${rawNewline}b">`,
+
+    // Entity-escaped characters don't trigger blocking:
+    `<img id="dangling" src="/images/green-1x1.png?img=${escapedNewline}b">`,
+    `<img id="dangling" src="/images/green-1x1.png?img=${escapedBrace}b">`,
+    `<img id="dangling" src="/images/green-1x1.png?img=${escapedNewline}b${escapedBrace}c">`,
+
+    // Leading and trailing whitespace is stripped:
+    `
+      <img id="dangling" src="
+        /images/green-1x1.png?img=
+      ">
+    `,
+    `
+      <img id="dangling" src="
+        /images/green-1x1.png?img=${escapedBrace}
+      ">
+    `,
+    `
+      <img id="dangling" src="
+        /images/green-1x1.png?img=${escapedNewline}
+      ">
+    `,
+  ];
+
+  should_load.forEach(markup => {
+    async_test(t => {
+      var i = createFrame(`${markup} <element attr="" another=''>`);
+      assert_img_loaded(t, i);
+    }, readableURL(markup));
+  });
+
+  // The following resources should be blocked, as their URLs contain both `\n` and `<` characters:
+  var should_block = [
+    `<img id="dangling" src="/images/green-1x1.png?img=${rawNewline}${rawBrace}b">`,
+    `<img id="dangling" src="/images/green-1x1.png?img=${rawBrace}${rawNewline}b">`,
+    `
+      <img id="dangling" src="/images/green-1x1.png?img=
+        ${rawBrace}
+        ${rawNewline}b
+      ">
+    `,
+  ];
+
+  should_block.forEach(markup => {
+    async_test(t => {
+      var i = createFrame(`${markup}`);
+      assert_img_not_loaded(t, i);
+    }, readableURL(markup));
+  });
+</script>
diff --git a/test/wpt/tests/fetch/security/embedded-credentials.tentative.sub.html b/test/wpt/tests/fetch/security/embedded-credentials.tentative.sub.html
new file mode 100644
index 00000000000..ca5ee1c87bd
--- /dev/null
+++ b/test/wpt/tests/fetch/security/embedded-credentials.tentative.sub.html
@@ -0,0 +1,89 @@
+<!DOCTYPE html>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<body>
+<script>
+    async_test(t => {
+      var i = document.createElement('img');
+      i.onerror = t.step_func_done();
+      i.onload = t.unreached_func("'onload' should not fire.");
+      i.src = "http://user:pass@{{domains[www]}}:{{ports[http][0]}}/images/red.png";
+    }, "Embedded credentials are treated as network errors.");
+
+    async_test(t => {
+      var i = document.createElement('iframe');
+      i.src = "./support/embedded-credential-window.sub.html";
+      i.onload = t.step_func(_ => {
+        var c = new MessageChannel();
+        c.port1.onmessage = t.step_func_done(e => {
+          assert_equals(e.data, "Error", "The image should not load.");
+          i.remove();
+        });
+        i.contentWindow.postMessage("Hi!", "*", [c.port2]);
+      });
+      document.body.appendChild(i);
+    }, "Embedded credentials are treated as network errors in frames.");
+
+    async_test(t => {
+      var w = window.open("./support/embedded-credential-window.sub.html");
+      window.addEventListener("message", t.step_func(message => {
+        if (message.source != w)
+          return;
+
+        var c = new MessageChannel();
+        c.port1.onmessage = t.step_func_done(e => {
+          w.close();
+          assert_equals(e.data, "Error", "The image should not load.");
+        });
+        w.postMessage("absolute", "*", [c.port2]);
+      }));
+    }, "Embedded credentials are treated as network errors in new windows.");
+
+    async_test(t => {
+      var w = window.open();
+      w.location.href = "http://user:pass@{{domains[www]}}:{{ports[http][0]}}/fetch/security/support/embedded-credential-window.sub.html";
+      window.addEventListener("message", t.step_func(message => {
+        if (message.source != w)
+          return;
+
+        var c = new MessageChannel();
+        c.port1.onmessage = t.step_func_done(e => {
+          w.close();
+          assert_equals(e.data, "Load", "The image should load.");
+        });
+        w.postMessage("relative", "*", [c.port2]);
+      }));
+    }, "Embedded credentials matching the top-level are not treated as network errors for relative URLs.");
+
+    async_test(t => {
+      var w = window.open();
+      w.location.href = "http://user:pass@{{domains[www]}}:{{ports[http][0]}}/fetch/security/support/embedded-credential-window.sub.html";
+      window.addEventListener("message", t.step_func(message => {
+        if (message.source != w)
+          return;
+
+        var c = new MessageChannel();
+        c.port1.onmessage = t.step_func_done(e => {
+          w.close();
+          assert_equals(e.data, "Load", "The image should load.");
+        });
+        w.postMessage("same-origin-matching", "*", [c.port2]);
+      }));
+    }, "Embedded credentials matching the top-level are not treated as network errors for same-origin URLs.");
+
+    async_test(t => {
+      var w = window.open();
+      w.location.href = "http://user:pass@{{domains[www]}}:{{ports[http][0]}}/fetch/security/support/embedded-credential-window.sub.html";
+      window.addEventListener("message", t.step_func(message => {
+        if (message.source != w)
+          return;
+
+        var c = new MessageChannel();
+        c.port1.onmessage = t.step_func_done(e => {
+          w.close();
+          assert_equals(e.data, "Error", "The image should load.");
+        });
+        w.postMessage("cross-origin-matching", "*", [c.port2]);
+      }));
+    }, "Embedded credentials matching the top-level are treated as network errors for cross-origin URLs.");
+</script>
diff --git a/test/wpt/tests/fetch/security/redirect-to-url-with-credentials.https.html b/test/wpt/tests/fetch/security/redirect-to-url-with-credentials.https.html
new file mode 100644
index 00000000000..b06464805c2
--- /dev/null
+++ b/test/wpt/tests/fetch/security/redirect-to-url-with-credentials.https.html
@@ -0,0 +1,68 @@
+<html>
+<header>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <script src="/common/get-host-info.sub.js"></script>
+</header>
+<body>
+<script>
+var host = get_host_info();
+
+var sameOriginImageURL = "/common/redirect.py?location=" + host.HTTPS_ORIGIN_WITH_CREDS + "/service-workers/service-worker/resources/fetch-access-control.py?ACAOrigin= " + host.HTTPS_ORIGIN + "%26PNGIMAGE%26ACACredentials=true";
+var imageURL = "/common/redirect.py?location=" + host.HTTPS_REMOTE_ORIGIN_WITH_CREDS + "/service-workers/service-worker/resources/fetch-access-control.py?ACAOrigin= " + host.HTTPS_ORIGIN + "%26PNGIMAGE%26ACACredentials=true";
+var frameURL = "/common/redirect.py?location=" + host.HTTPS_REMOTE_ORIGIN_WITH_CREDS + "/common/blank.html";
+
+promise_test((test) => {
+    return fetch(imageURL, {mode: "no-cors"});
+}, "No CORS fetch after a redirect with an URL containing credentials");
+
+promise_test((test) => {
+    return promise_rejects_js(test, TypeError, fetch(imageURL, {mode: "cors"}));
+}, "CORS fetch after a redirect with a cross origin URL containing credentials");
+
+promise_test((test) => {
+    return fetch(sameOriginImageURL, {mode: "cors"});
+}, "CORS fetch after a redirect with a same origin URL containing credentials");
+
+promise_test((test) => {
+    return new Promise((resolve, reject) => {
+        var image = new Image();
+        image.onload = resolve;
+        image.onerror = (e) => reject(e);
+        image.src = imageURL;
+    });
+}, "Image loading after a redirect with an URL containing credentials");
+
+promise_test((test) => {
+    return new Promise((resolve, reject) => {
+        var image = new Image();
+        image.crossOrigin = "use-credentials";
+        image.onerror = resolve;
+        image.onload = () => reject("Image should not load");
+        image.src = imageURL;
+    });
+}, "CORS Image loading after a redirect with a cross origin URL containing credentials");
+
+promise_test((test) => {
+    return new Promise((resolve, reject) => {
+        var image = new Image();
+        image.crossOrigin = "use-credentials";
+        image.onload = resolve;
+        image.onerror = (e) => reject(e);
+        image.src = sameOriginImageURL;
+    });
+}, "CORS Image loading after a redirect with a same origin URL containing credentials");
+
+promise_test(async (test) => {
+    var iframe = document.createElement("iframe");
+    document.body.appendChild(iframe);
+    await new Promise((resolve, reject) => {
+        iframe.src = frameURL;
+        iframe.onload = resolve;
+        iframe.onerror = (e) => reject(e);
+    });
+    document.body.removeChild(iframe);
+}, "Frame loading after a redirect with an URL containing credentials");
+</script>
+</body>
+</html>
diff --git a/test/wpt/tests/fetch/security/support/embedded-credential-window.sub.html b/test/wpt/tests/fetch/security/support/embedded-credential-window.sub.html
new file mode 100644
index 00000000000..20d307e9188
--- /dev/null
+++ b/test/wpt/tests/fetch/security/support/embedded-credential-window.sub.html
@@ -0,0 +1,19 @@
+<!DOCTYPE html>
+<script>
+  window.addEventListener("message", e => {
+    var i = document.createElement('img');
+    i.onload = () => { e.ports[0].postMessage("Load"); }
+    i.onerror = () => { e.ports[0].postMessage("Error"); }
+    if (e.data == "relative") {
+      i.src = "/images/green.png";
+    } else if (e.data == "same-origin-matching") {
+      i.src = "http://user:pass@{{domains[www]}}:{{ports[http][0]}}/images/green.png";
+    } else if (e.data == "cross-origin-matching") {
+      i.src = "http://user:pass@{{domains[élève]}}:{{ports[http][0]}}/images/red.png";
+    } else {
+      i.src = "http://user:pass@{{domains[www]}}:{{ports[http][0]}}/images/red.png";
+    }
+  });
+
+  (window.opener || window.parent).postMessage("Hi!", "*");
+</script>
diff --git a/test/wpt/tests/fetch/stale-while-revalidate/fetch-sw.https.html b/test/wpt/tests/fetch/stale-while-revalidate/fetch-sw.https.html
new file mode 100644
index 00000000000..efcebc24a63
--- /dev/null
+++ b/test/wpt/tests/fetch/stale-while-revalidate/fetch-sw.https.html
@@ -0,0 +1,65 @@
+<!DOCTYPE html>
+<html>
+<head>
+  <meta charset="utf-8">
+  <title>Stale Revalidation Requests don't get sent to service worker</title>
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  <script src="../../service-workers/service-worker/resources/test-helpers.sub.js"></script>
+  <script src="/common/utils.js"></script>
+</head>
+<body>
+<script>
+
+  // Duplicating this resource to make service worker scoping simpler.
+  async function setupRegistrationAndWaitToBeControlled(t, scope) {
+    const controlled = new Promise((resolve) => {
+      navigator.serviceWorker.oncontrollerchange = () => { resolve(); };
+    });
+    const reg = await navigator.serviceWorker.register('sw-intercept.js');
+    await wait_for_state(t, reg.installing, 'activated');
+    await controlled;
+    add_completion_callback(_ => reg.unregister());
+    return reg;
+  }
+
+  // Using 250ms polling interval to provide enough 'network calmness' to give
+  // the background low priority revalidation request a chance to kick in.
+  function wait250ms(test) {
+    return new Promise(resolve => {
+      test.step_timeout(() => {
+        resolve();
+      }, 250);
+    });
+  }
+
+  promise_test(async (test) => {
+    var request_token = token();
+    const uri = 'resources/stale-script.py?token=' + request_token;
+
+    await setupRegistrationAndWaitToBeControlled(test, 'resources/stale-script.py');
+
+    var service_worker_count = 0;
+    navigator.serviceWorker.addEventListener('message', function once(event) {
+      if (event.data.endsWith(uri)) {
+        service_worker_count++;
+      }
+    });
+
+    const response = await fetch(uri);
+    const response2 = await fetch(uri);
+    assert_equals(response.headers.get('Unique-Id'), response2.headers.get('Unique-Id'));
+    while(true) {
+      const revalidation_check = await fetch(`resources/stale-script.py?query&token=` + request_token);
+      if (revalidation_check.headers.get('Count') == '2') {
+        // The service worker should not see the revalidation request.
+        assert_equals(service_worker_count, 2);
+        break;
+      }
+      await wait250ms(test);
+    }
+  }, 'Second fetch returns same response');
+
+</script>
+</body>
+</html>
diff --git a/test/wpt/tests/fetch/stale-while-revalidate/fetch.any.js b/test/wpt/tests/fetch/stale-while-revalidate/fetch.any.js
new file mode 100644
index 00000000000..3682b9d2c31
--- /dev/null
+++ b/test/wpt/tests/fetch/stale-while-revalidate/fetch.any.js
@@ -0,0 +1,32 @@
+// META: global=window,worker
+// META: title=Tests Stale While Revalidate is executed for fetch API
+// META: script=/common/utils.js
+
+function wait25ms(test) {
+  return new Promise(resolve => {
+    test.step_timeout(() => {
+      resolve();
+    }, 25);
+  });
+}
+
+promise_test(async (test) => {
+  var request_token = token();
+
+  const response = await fetch(`resources/stale-script.py?token=` + request_token);
+  // Wait until resource is completely fetched to allow caching before next fetch.
+  const body = await response.text();
+  const response2 = await fetch(`resources/stale-script.py?token=` + request_token);
+
+  assert_equals(response.headers.get('Unique-Id'), response2.headers.get('Unique-Id'));
+  const body2 = await response2.text();
+  assert_equals(body, body2);
+
+  while(true) {
+    const revalidation_check = await fetch(`resources/stale-script.py?query&token=` + request_token);
+    if (revalidation_check.headers.get('Count') == '2') {
+      break;
+    }
+    await wait25ms(test);
+  }
+}, 'Second fetch returns same response');
diff --git a/test/wpt/tests/fetch/stale-while-revalidate/resources/stale-css.py b/test/wpt/tests/fetch/stale-while-revalidate/resources/stale-css.py
new file mode 100644
index 00000000000..b87668373ac
--- /dev/null
+++ b/test/wpt/tests/fetch/stale-while-revalidate/resources/stale-css.py
@@ -0,0 +1,28 @@
+def main(request, response):
+
+    token = request.GET.first(b"token", None)
+    is_query = request.GET.first(b"query", None) != None
+    with request.server.stash.lock:
+      value = request.server.stash.take(token)
+      count = 0
+      if value != None:
+        count = int(value)
+      if is_query:
+        if count < 2:
+          request.server.stash.put(token, count)
+      else:
+        count = count + 1
+        request.server.stash.put(token, count)
+    if is_query:
+      headers = [(b"Count", count)]
+      content = b""
+      return 200, headers, content
+    else:
+      content = b"body { background: rgb(0, 128, 0); }"
+      if count > 1:
+        content = b"body { background: rgb(255, 0, 0); }"
+
+      headers = [(b"Content-Type", b"text/css"),
+                 (b"Cache-Control", b"private, max-age=0, stale-while-revalidate=60")]
+
+      return 200, headers, content
diff --git a/test/wpt/tests/fetch/stale-while-revalidate/resources/stale-image.py b/test/wpt/tests/fetch/stale-while-revalidate/resources/stale-image.py
new file mode 100644
index 00000000000..36e6fc0c9bb
--- /dev/null
+++ b/test/wpt/tests/fetch/stale-while-revalidate/resources/stale-image.py
@@ -0,0 +1,40 @@
+import os.path
+
+from wptserve.utils import isomorphic_decode
+
+def main(request, response):
+
+    token = request.GET.first(b"token", None)
+    is_query = request.GET.first(b"query", None) != None
+    with request.server.stash.lock:
+      value = request.server.stash.take(token)
+      count = 0
+      if value != None:
+        count = int(value)
+      if is_query:
+        if count < 2:
+          request.server.stash.put(token, count)
+      else:
+        count = count + 1
+        request.server.stash.put(token, count)
+
+    if is_query:
+      headers = [(b"Count", count)]
+      content = b""
+      return 200, headers, content
+    else:
+      filename = u"green-16x16.png"
+      if count > 1:
+        filename = u"green-256x256.png"
+
+      path = os.path.join(os.path.dirname(isomorphic_decode(__file__)), u"../../../images", filename)
+      body = open(path, "rb").read()
+
+      response.add_required_headers = False
+      response.writer.write_status(200)
+      response.writer.write_header(b"content-length", len(body))
+      response.writer.write_header(b"Cache-Control", b"private, max-age=0, stale-while-revalidate=60")
+      response.writer.write_header(b"content-type", b"image/png")
+      response.writer.end_headers()
+
+      response.writer.write(body)
diff --git a/test/wpt/tests/fetch/stale-while-revalidate/resources/stale-script.py b/test/wpt/tests/fetch/stale-while-revalidate/resources/stale-script.py
new file mode 100644
index 00000000000..731cd805654
--- /dev/null
+++ b/test/wpt/tests/fetch/stale-while-revalidate/resources/stale-script.py
@@ -0,0 +1,32 @@
+import random, string
+
+def id_token():
+   letters = string.ascii_lowercase
+   return b''.join(random.choice(letters).encode("utf-8") for i in range(20))
+
+def main(request, response):
+    token = request.GET.first(b"token", None)
+    is_query = request.GET.first(b"query", None) != None
+    with request.server.stash.lock:
+      value = request.server.stash.take(token)
+      count = 0
+      if value != None:
+        count = int(value)
+      if is_query:
+        if count < 2:
+          request.server.stash.put(token, count)
+      else:
+        count = count + 1
+        request.server.stash.put(token, count)
+
+    if is_query:
+      headers = [(b"Count", count)]
+      content = u""
+      return 200, headers, content
+    else:
+      unique_id = id_token()
+      headers = [(b"Content-Type", b"text/javascript"),
+                 (b"Cache-Control", b"private, max-age=0, stale-while-revalidate=60"),
+                 (b"Unique-Id", unique_id)]
+      content = b"report('%s')" % unique_id
+      return 200, headers, content
diff --git a/test/wpt/tests/fetch/stale-while-revalidate/revalidate-not-blocked-by-csp.html b/test/wpt/tests/fetch/stale-while-revalidate/revalidate-not-blocked-by-csp.html
new file mode 100644
index 00000000000..ea70b9a9c76
--- /dev/null
+++ b/test/wpt/tests/fetch/stale-while-revalidate/revalidate-not-blocked-by-csp.html
@@ -0,0 +1,69 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Test revalidations requests aren't blocked by CSP.</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/common/utils.js"></script>
+<body>
+<script>
+
+// Regression test for https://crbug.com/1070117.
+var request_token = token();
+let image_src = "resources/stale-image.py?token=" + request_token;
+
+let loadImage = async () => {
+  let img = document.createElement("img");
+  img.src = image_src;
+  let loaded = new Promise(r => img.onload = r);
+  document.body.appendChild(img);
+  await loaded;
+  return img;
+};
+
+promise_test(async t => {
+  await new Promise(r => window.onload = r);
+
+  // No CSP report must be sent from now.
+  //
+  // TODO(arthursonzogni): Some browser implementations do not support the
+  // ReportingObserver yet. Ideally, another way to access the reports should be
+  // used to test them.
+  const observer = new ReportingObserver(t.unreached_func(
+    "CSP reports aren't sent for revalidation requests"));
+  if (observer)
+    observer.observe();
+
+  let img1 = await loadImage(); // Load initial resource.
+  let img2 = loadImage();       // Request stale resource.
+
+  // Insert a <meta> CSP. This will block any image load starting from now.
+  const metaCSP = document.createElement("meta");
+  metaCSP.httpEquiv = "Content-Security-Policy";
+  metaCSP.content = "img-src 'none'";
+  document.getElementsByTagName("head")[0].appendChild(metaCSP)
+
+  // The images were requested before the <meta> CSP above was added. So they
+  // will load. Nevertheless, the resource will be stale. A revalidation request
+  // is going to be made after that.
+  assert_equals(img1.width, 16, "(initial version loaded)");
+  assert_equals((await img2).width, 16, "(stale version loaded)");
+
+  // At some point, the <img> resource is going to be revalidated. It must not
+  // be blocked nor trigger a CSP violation report.
+
+  // Query the server again and again. At some point it must have received the
+  // revalidation request. We poll, because we don't know when the revalidation
+  // will occur.
+  let query = false;
+  while(true) {
+    await new Promise(r => step_timeout(r, 25));
+    let response = await fetch(`${image_src}${query ? "&query" : ""}`);
+    let count = response.headers.get("Count");
+    if (count == "2")
+      break;
+    query ^= true;
+  }
+}, "Request revalidation aren't blocked by CSP");
+
+</script>
+</body>
diff --git a/test/wpt/tests/fetch/stale-while-revalidate/stale-css.html b/test/wpt/tests/fetch/stale-while-revalidate/stale-css.html
new file mode 100644
index 00000000000..603a60c8bba
--- /dev/null
+++ b/test/wpt/tests/fetch/stale-while-revalidate/stale-css.html
@@ -0,0 +1,51 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Tests Stale While Revalidate works for css</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/common/utils.js"></script>
+<body>
+<script>
+
+var request_token = token();
+let link_src = "./resources/stale-css.py?token=" + request_token;
+
+let loadLink = async() => {
+  let link = document.createElement("link");
+  link.rel = "stylesheet";
+  link.type = "text/css";
+  link.href = "resources/stale-css.py?token=" + request_token;
+  let loaded = new Promise(r => link.onload = r);
+  document.body.appendChild(link);
+  await loaded;
+  return window
+    .getComputedStyle(document.body)
+    .getPropertyValue('background-color');
+};
+
+promise_test(async t => {
+  await new Promise(r => window.onload = r);
+
+  let bgColor1 = await loadLink();
+  assert_equals(bgColor1, "rgb(0, 128, 0)", "(initial version loaded)");
+
+  let bgColor2 = await loadLink();
+  assert_equals(bgColor2, "rgb(0, 128, 0)", "(stale version loaded)");
+
+  // Query the server again and again. At some point it must have received the
+  // revalidation request. We poll, because we don't know when the revalidation
+  // will occur.
+  while(true) {
+    await new Promise(r => step_timeout(r, 25));
+    let response = await fetch(link_src + "&query");
+    let count = response.headers.get("Count");
+    if (count == '2')
+      break;
+  }
+
+  let bgColor3 = await loadLink();
+  assert_equals(bgColor3, "rgb(255, 0, 0)", "(revalidated version loaded)");
+}, 'Cache returns stale resource');
+
+</script>
+</body>
diff --git a/test/wpt/tests/fetch/stale-while-revalidate/stale-image.html b/test/wpt/tests/fetch/stale-while-revalidate/stale-image.html
new file mode 100644
index 00000000000..d86bdfbde2c
--- /dev/null
+++ b/test/wpt/tests/fetch/stale-while-revalidate/stale-image.html
@@ -0,0 +1,55 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Tests Stale While Revalidate works for images</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/common/utils.js"></script>
+<body>
+<!--
+Use a child document to load the second stale image into because
+an image loaded into the same document will skip cache-control headers.
+See: https://html.spec.whatwg.org/#the-list-of-available-images
+-->
+<iframe id="child1" srcdoc=""></iframe>
+<iframe id="child2" srcdoc=""></iframe>
+<script>
+
+var request_token = token();
+let image_src = "resources/stale-image.py?token=" + request_token;
+
+let loadImage = async (document) => {
+  let img = document.createElement("img");
+  img.src = image_src;
+  let loaded = new Promise(r => img.onload = r);
+  document.body.appendChild(img);
+  await loaded;
+  return img;
+};
+
+promise_test(async t => {
+  await new Promise(r => window.onload = r);
+
+  let img1 = await loadImage(document);
+  assert_equals(img1.width, 16, "(initial version loaded)");
+
+  let img2 = await loadImage(child1.contentDocument);
+  assert_equals(img2.width, 16, "(stale version loaded)");
+
+  // Query the server again and again. At some point it must have received the
+  // revalidation request. We poll, because we don't know when the revalidation
+  // will occur.
+  while(true) {
+    await new Promise(r => step_timeout(r, 25));
+    let response = await fetch(image_src + "&query");
+    let count = response.headers.get("Count");
+    if (count == '2')
+      break;
+  }
+
+  let img3 = await loadImage(child2.contentDocument);
+  assert_equals(img3.width, 256, "(revalidated version loaded)");
+
+}, 'Cache returns stale resource');
+
+</script>
+</body>
diff --git a/test/wpt/tests/fetch/stale-while-revalidate/stale-script.html b/test/wpt/tests/fetch/stale-while-revalidate/stale-script.html
new file mode 100644
index 00000000000..f5317482c48
--- /dev/null
+++ b/test/wpt/tests/fetch/stale-while-revalidate/stale-script.html
@@ -0,0 +1,59 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Tests Stale While Revalidate works for scripts</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/common/utils.js"></script>
+<body>
+<script>
+
+const request_token = token();
+const script_src = "./resources/stale-script.py?token=" + request_token;
+
+// The script above will call report() via a uniquely generated ID on the
+// subresource. If it is a cache hit, the ID will be the same and
+// |last_modified_count| won't be incremented.
+let last_modified;
+let last_modified_count = 0;
+function report(mod) {
+  if (last_modified == mod)
+    return;
+  last_modified = mod;
+  last_modified_count++;
+}
+
+let loadScript = async () => {
+  let script = document.createElement("script");
+  let script_loaded = new Promise(r => script.onload = r);
+  script.src = script_src;
+  document.body.appendChild(script);
+  await script_loaded;
+};
+
+promise_test(async t => {
+  await new Promise(r => window.onload = r);
+
+  await loadScript();
+  assert_equals(last_modified_count, 1, '(initial version loaded)');
+
+  await loadScript();
+  assert_equals(last_modified_count, 1, '(stale version loaded)');
+
+  // Query the server again and again. At some point it must have received the
+  // revalidation request. We poll, because we don't know when the revalidation
+  // will occur.
+  while(true) {
+    await new Promise(r => step_timeout(r, 25));
+    let response = await fetch(script_src + "&query");
+    let count = response.headers.get("Count");
+    if (count == '2')
+      break;
+  }
+
+  await loadScript();
+  assert_equals(last_modified_count, 2, '(revalidated version loaded)');
+
+}, 'Cache returns stale resource');
+
+</script>
+</body>
diff --git a/test/wpt/tests/fetch/stale-while-revalidate/sw-intercept.js b/test/wpt/tests/fetch/stale-while-revalidate/sw-intercept.js
new file mode 100644
index 00000000000..dca7de51b0b
--- /dev/null
+++ b/test/wpt/tests/fetch/stale-while-revalidate/sw-intercept.js
@@ -0,0 +1,14 @@
+async function broadcast(msg) {
+  for (const client of await clients.matchAll()) {
+    client.postMessage(msg);
+  }
+}
+
+self.addEventListener('fetch', event => {
+  event.waitUntil(broadcast(event.request.url));
+  event.respondWith(fetch(event.request));
+});
+
+self.addEventListener('activate', event => {
+  self.clients.claim();
+});
diff --git a/test/wpt/tests/interfaces/ANGLE_instanced_arrays.idl b/test/wpt/tests/interfaces/ANGLE_instanced_arrays.idl
new file mode 100644
index 00000000000..557a4163331
--- /dev/null
+++ b/test/wpt/tests/interfaces/ANGLE_instanced_arrays.idl
@@ -0,0 +1,12 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: WebGL ANGLE_instanced_arrays Khronos Ratified Extension Specification (https://registry.khronos.org/webgl/extensions/ANGLE_instanced_arrays/)
+
+[Exposed=(Window,Worker), LegacyNoInterfaceObject]
+interface ANGLE_instanced_arrays {
+    const GLenum VERTEX_ATTRIB_ARRAY_DIVISOR_ANGLE = 0x88FE;
+    undefined drawArraysInstancedANGLE(GLenum mode, GLint first, GLsizei count, GLsizei primcount);
+    undefined drawElementsInstancedANGLE(GLenum mode, GLsizei count, GLenum type, GLintptr offset, GLsizei primcount);
+    undefined vertexAttribDivisorANGLE(GLuint index, GLuint divisor);
+};
diff --git a/test/wpt/tests/interfaces/CSP.idl b/test/wpt/tests/interfaces/CSP.idl
new file mode 100644
index 00000000000..ac0a6ff5638
--- /dev/null
+++ b/test/wpt/tests/interfaces/CSP.idl
@@ -0,0 +1,56 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Content Security Policy Level 3 (https://w3c.github.io/webappsec-csp/)
+
+[Exposed=Window]
+interface CSPViolationReportBody : ReportBody {
+  [Default] object toJSON();
+  readonly attribute USVString documentURL;
+  readonly attribute USVString? referrer;
+  readonly attribute USVString? blockedURL;
+  readonly attribute DOMString effectiveDirective;
+  readonly attribute DOMString originalPolicy;
+  readonly attribute USVString? sourceFile;
+  readonly attribute DOMString? sample;
+  readonly attribute SecurityPolicyViolationEventDisposition disposition;
+  readonly attribute unsigned short statusCode;
+  readonly attribute unsigned long? lineNumber;
+  readonly attribute unsigned long? columnNumber;
+};
+
+enum SecurityPolicyViolationEventDisposition {
+  "enforce", "report"
+};
+
+[Exposed=(Window,Worker)]
+interface SecurityPolicyViolationEvent : Event {
+    constructor(DOMString type, optional SecurityPolicyViolationEventInit eventInitDict = {});
+    readonly    attribute USVString      documentURI;
+    readonly    attribute USVString      referrer;
+    readonly    attribute USVString      blockedURI;
+    readonly    attribute DOMString      effectiveDirective;
+    readonly    attribute DOMString      violatedDirective; // historical alias of effectiveDirective
+    readonly    attribute DOMString      originalPolicy;
+    readonly    attribute USVString      sourceFile;
+    readonly    attribute DOMString      sample;
+    readonly    attribute SecurityPolicyViolationEventDisposition      disposition;
+    readonly    attribute unsigned short statusCode;
+    readonly    attribute unsigned long  lineNumber;
+    readonly    attribute unsigned long  columnNumber;
+};
+
+dictionary SecurityPolicyViolationEventInit : EventInit {
+    required USVString      documentURI;
+             USVString      referrer = "";
+             USVString      blockedURI = "";
+    required DOMString      violatedDirective;
+    required DOMString      effectiveDirective;
+    required DOMString      originalPolicy;
+             USVString      sourceFile = "";
+             DOMString      sample = "";
+    required SecurityPolicyViolationEventDisposition disposition;
+    required unsigned short statusCode;
+             unsigned long  lineNumber = 0;
+             unsigned long  columnNumber = 0;
+};
diff --git a/test/wpt/tests/interfaces/DOM-Parsing.idl b/test/wpt/tests/interfaces/DOM-Parsing.idl
new file mode 100644
index 00000000000..d0d84ab6972
--- /dev/null
+++ b/test/wpt/tests/interfaces/DOM-Parsing.idl
@@ -0,0 +1,26 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: DOM Parsing and Serialization (https://w3c.github.io/DOM-Parsing/)
+
+[Exposed=Window]
+interface XMLSerializer {
+  constructor();
+  DOMString serializeToString(Node root);
+};
+
+interface mixin InnerHTML {
+  [CEReactions] attribute [LegacyNullToEmptyString] DOMString innerHTML;
+};
+
+Element includes InnerHTML;
+ShadowRoot includes InnerHTML;
+
+partial interface Element {
+  [CEReactions] attribute [LegacyNullToEmptyString] DOMString outerHTML;
+  [CEReactions] undefined insertAdjacentHTML(DOMString position, DOMString text);
+};
+
+partial interface Range {
+  [CEReactions, NewObject] DocumentFragment createContextualFragment(DOMString fragment);
+};
diff --git a/test/wpt/tests/interfaces/EXT_blend_minmax.idl b/test/wpt/tests/interfaces/EXT_blend_minmax.idl
new file mode 100644
index 00000000000..fd7d26e7fb7
--- /dev/null
+++ b/test/wpt/tests/interfaces/EXT_blend_minmax.idl
@@ -0,0 +1,10 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: WebGL EXT_blend_minmax Khronos Ratified Extension Specification (https://registry.khronos.org/webgl/extensions/EXT_blend_minmax/)
+
+[Exposed=(Window,Worker), LegacyNoInterfaceObject]
+interface EXT_blend_minmax {
+  const GLenum MIN_EXT = 0x8007;
+  const GLenum MAX_EXT = 0x8008;
+};
diff --git a/test/wpt/tests/interfaces/EXT_clip_cull_distance.idl b/test/wpt/tests/interfaces/EXT_clip_cull_distance.idl
new file mode 100644
index 00000000000..18d1c02a11a
--- /dev/null
+++ b/test/wpt/tests/interfaces/EXT_clip_cull_distance.idl
@@ -0,0 +1,20 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: WebGL EXT_clip_cull_distance Extension Draft Specification (https://registry.khronos.org/webgl/extensions/EXT_clip_cull_distance/)
+
+[Exposed=(Window,Worker), LegacyNoInterfaceObject]
+interface EXT_clip_cull_distance {
+  const GLenum MAX_CLIP_DISTANCES_EXT                       = 0x0D32;
+  const GLenum MAX_CULL_DISTANCES_EXT                       = 0x82F9;
+  const GLenum MAX_COMBINED_CLIP_AND_CULL_DISTANCES_EXT     = 0x82FA;
+
+  const GLenum CLIP_DISTANCE0_EXT                           = 0x3000;
+  const GLenum CLIP_DISTANCE1_EXT                           = 0x3001;
+  const GLenum CLIP_DISTANCE2_EXT                           = 0x3002;
+  const GLenum CLIP_DISTANCE3_EXT                           = 0x3003;
+  const GLenum CLIP_DISTANCE4_EXT                           = 0x3004;
+  const GLenum CLIP_DISTANCE5_EXT                           = 0x3005;
+  const GLenum CLIP_DISTANCE6_EXT                           = 0x3006;
+  const GLenum CLIP_DISTANCE7_EXT                           = 0x3007;
+};
diff --git a/test/wpt/tests/interfaces/EXT_color_buffer_float.idl b/test/wpt/tests/interfaces/EXT_color_buffer_float.idl
new file mode 100644
index 00000000000..09bd397d01f
--- /dev/null
+++ b/test/wpt/tests/interfaces/EXT_color_buffer_float.idl
@@ -0,0 +1,8 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: WebGL EXT_color_buffer_float Extension Specification (https://registry.khronos.org/webgl/extensions/EXT_color_buffer_float/)
+
+[Exposed=(Window,Worker), LegacyNoInterfaceObject]
+interface EXT_color_buffer_float {
+}; // interface EXT_color_buffer_float
diff --git a/test/wpt/tests/interfaces/EXT_color_buffer_half_float.idl b/test/wpt/tests/interfaces/EXT_color_buffer_half_float.idl
new file mode 100644
index 00000000000..7197e44f270
--- /dev/null
+++ b/test/wpt/tests/interfaces/EXT_color_buffer_half_float.idl
@@ -0,0 +1,12 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: WebGL EXT_color_buffer_half_float Extension Specification (https://registry.khronos.org/webgl/extensions/EXT_color_buffer_half_float/)
+
+[Exposed=(Window,Worker), LegacyNoInterfaceObject]
+interface EXT_color_buffer_half_float {
+  const GLenum RGBA16F_EXT = 0x881A;
+  const GLenum RGB16F_EXT = 0x881B;
+  const GLenum FRAMEBUFFER_ATTACHMENT_COMPONENT_TYPE_EXT = 0x8211;
+  const GLenum UNSIGNED_NORMALIZED_EXT = 0x8C17;
+}; // interface EXT_color_buffer_half_float
diff --git a/test/wpt/tests/interfaces/EXT_disjoint_timer_query.idl b/test/wpt/tests/interfaces/EXT_disjoint_timer_query.idl
new file mode 100644
index 00000000000..cf0c8d9a286
--- /dev/null
+++ b/test/wpt/tests/interfaces/EXT_disjoint_timer_query.idl
@@ -0,0 +1,30 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: WebGL EXT_disjoint_timer_query Extension Specification (https://registry.khronos.org/webgl/extensions/EXT_disjoint_timer_query/)
+
+typedef unsigned long long GLuint64EXT;
+
+[Exposed=(Window,Worker), LegacyNoInterfaceObject]
+interface WebGLTimerQueryEXT : WebGLObject {
+};
+
+[Exposed=(Window,Worker), LegacyNoInterfaceObject]
+interface EXT_disjoint_timer_query {
+  const GLenum QUERY_COUNTER_BITS_EXT      = 0x8864;
+  const GLenum CURRENT_QUERY_EXT           = 0x8865;
+  const GLenum QUERY_RESULT_EXT            = 0x8866;
+  const GLenum QUERY_RESULT_AVAILABLE_EXT  = 0x8867;
+  const GLenum TIME_ELAPSED_EXT            = 0x88BF;
+  const GLenum TIMESTAMP_EXT               = 0x8E28;
+  const GLenum GPU_DISJOINT_EXT            = 0x8FBB;
+
+  WebGLTimerQueryEXT? createQueryEXT();
+  undefined deleteQueryEXT(WebGLTimerQueryEXT? query);
+  [WebGLHandlesContextLoss] boolean isQueryEXT(WebGLTimerQueryEXT? query);
+  undefined beginQueryEXT(GLenum target, WebGLTimerQueryEXT query);
+  undefined endQueryEXT(GLenum target);
+  undefined queryCounterEXT(WebGLTimerQueryEXT query, GLenum target);
+  any getQueryEXT(GLenum target, GLenum pname);
+  any getQueryObjectEXT(WebGLTimerQueryEXT query, GLenum pname);
+};
diff --git a/test/wpt/tests/interfaces/EXT_disjoint_timer_query_webgl2.idl b/test/wpt/tests/interfaces/EXT_disjoint_timer_query_webgl2.idl
new file mode 100644
index 00000000000..689203cb477
--- /dev/null
+++ b/test/wpt/tests/interfaces/EXT_disjoint_timer_query_webgl2.idl
@@ -0,0 +1,14 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: WebGL EXT_disjoint_timer_query_webgl2 Extension Specification (https://registry.khronos.org/webgl/extensions/EXT_disjoint_timer_query_webgl2/)
+
+[Exposed=(Window,Worker), LegacyNoInterfaceObject]
+interface EXT_disjoint_timer_query_webgl2 {
+  const GLenum QUERY_COUNTER_BITS_EXT      = 0x8864;
+  const GLenum TIME_ELAPSED_EXT            = 0x88BF;
+  const GLenum TIMESTAMP_EXT               = 0x8E28;
+  const GLenum GPU_DISJOINT_EXT            = 0x8FBB;
+
+  undefined queryCounterEXT(WebGLQuery query, GLenum target);
+};
diff --git a/test/wpt/tests/interfaces/EXT_float_blend.idl b/test/wpt/tests/interfaces/EXT_float_blend.idl
new file mode 100644
index 00000000000..58ec47e17e2
--- /dev/null
+++ b/test/wpt/tests/interfaces/EXT_float_blend.idl
@@ -0,0 +1,8 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: WebGL EXT_float_blend Extension Specification (https://registry.khronos.org/webgl/extensions/EXT_float_blend/)
+
+[Exposed=(Window,Worker), LegacyNoInterfaceObject]
+interface EXT_float_blend {
+}; // interface EXT_float_blend
diff --git a/test/wpt/tests/interfaces/EXT_frag_depth.idl b/test/wpt/tests/interfaces/EXT_frag_depth.idl
new file mode 100644
index 00000000000..1ae6896effd
--- /dev/null
+++ b/test/wpt/tests/interfaces/EXT_frag_depth.idl
@@ -0,0 +1,8 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: WebGL EXT_frag_depth Khronos Ratified Extension Specification (https://registry.khronos.org/webgl/extensions/EXT_frag_depth/)
+
+[Exposed=(Window,Worker), LegacyNoInterfaceObject]
+interface EXT_frag_depth {
+};
diff --git a/test/wpt/tests/interfaces/EXT_sRGB.idl b/test/wpt/tests/interfaces/EXT_sRGB.idl
new file mode 100644
index 00000000000..3c03c33ff81
--- /dev/null
+++ b/test/wpt/tests/interfaces/EXT_sRGB.idl
@@ -0,0 +1,12 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: WebGL EXT_sRGB Extension Specification (https://registry.khronos.org/webgl/extensions/EXT_sRGB/)
+
+[Exposed=(Window,Worker), LegacyNoInterfaceObject]
+interface EXT_sRGB {
+  const GLenum SRGB_EXT                                     = 0x8C40;
+  const GLenum SRGB_ALPHA_EXT                               = 0x8C42;
+  const GLenum SRGB8_ALPHA8_EXT                             = 0x8C43;
+  const GLenum FRAMEBUFFER_ATTACHMENT_COLOR_ENCODING_EXT    = 0x8210;
+};
diff --git a/test/wpt/tests/interfaces/EXT_shader_texture_lod.idl b/test/wpt/tests/interfaces/EXT_shader_texture_lod.idl
new file mode 100644
index 00000000000..13df26c3ce0
--- /dev/null
+++ b/test/wpt/tests/interfaces/EXT_shader_texture_lod.idl
@@ -0,0 +1,8 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: WebGL EXT_shader_texture_lod Khronos Ratified Extension Specification (https://registry.khronos.org/webgl/extensions/EXT_shader_texture_lod/)
+
+[Exposed=(Window,Worker), LegacyNoInterfaceObject]
+interface EXT_shader_texture_lod {
+};
diff --git a/test/wpt/tests/interfaces/EXT_texture_compression_bptc.idl b/test/wpt/tests/interfaces/EXT_texture_compression_bptc.idl
new file mode 100644
index 00000000000..2772980bdc9
--- /dev/null
+++ b/test/wpt/tests/interfaces/EXT_texture_compression_bptc.idl
@@ -0,0 +1,12 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: WebGL EXT_texture_compression_bptc Extension Specification (https://registry.khronos.org/webgl/extensions/EXT_texture_compression_bptc/)
+
+[Exposed=(Window,Worker), LegacyNoInterfaceObject]
+interface EXT_texture_compression_bptc {
+    const GLenum COMPRESSED_RGBA_BPTC_UNORM_EXT = 0x8E8C;
+    const GLenum COMPRESSED_SRGB_ALPHA_BPTC_UNORM_EXT = 0x8E8D;
+    const GLenum COMPRESSED_RGB_BPTC_SIGNED_FLOAT_EXT = 0x8E8E;
+    const GLenum COMPRESSED_RGB_BPTC_UNSIGNED_FLOAT_EXT = 0x8E8F;
+};
diff --git a/test/wpt/tests/interfaces/EXT_texture_compression_rgtc.idl b/test/wpt/tests/interfaces/EXT_texture_compression_rgtc.idl
new file mode 100644
index 00000000000..f12b962ea0a
--- /dev/null
+++ b/test/wpt/tests/interfaces/EXT_texture_compression_rgtc.idl
@@ -0,0 +1,12 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: WebGL EXT_texture_compression_rgtc Extension Specification (https://registry.khronos.org/webgl/extensions/EXT_texture_compression_rgtc/)
+
+[Exposed=(Window,Worker), LegacyNoInterfaceObject]
+interface EXT_texture_compression_rgtc {
+    const GLenum COMPRESSED_RED_RGTC1_EXT = 0x8DBB;
+    const GLenum COMPRESSED_SIGNED_RED_RGTC1_EXT = 0x8DBC;
+    const GLenum COMPRESSED_RED_GREEN_RGTC2_EXT = 0x8DBD;
+    const GLenum COMPRESSED_SIGNED_RED_GREEN_RGTC2_EXT = 0x8DBE;
+};
diff --git a/test/wpt/tests/interfaces/EXT_texture_filter_anisotropic.idl b/test/wpt/tests/interfaces/EXT_texture_filter_anisotropic.idl
new file mode 100644
index 00000000000..5c78bfaf4fa
--- /dev/null
+++ b/test/wpt/tests/interfaces/EXT_texture_filter_anisotropic.idl
@@ -0,0 +1,10 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: WebGL EXT_texture_filter_anisotropic Khronos Ratified Extension Specification (https://registry.khronos.org/webgl/extensions/EXT_texture_filter_anisotropic/)
+
+[Exposed=(Window,Worker), LegacyNoInterfaceObject]
+interface EXT_texture_filter_anisotropic {
+  const GLenum TEXTURE_MAX_ANISOTROPY_EXT       = 0x84FE;
+  const GLenum MAX_TEXTURE_MAX_ANISOTROPY_EXT   = 0x84FF;
+};
diff --git a/test/wpt/tests/interfaces/EXT_texture_norm16.idl b/test/wpt/tests/interfaces/EXT_texture_norm16.idl
new file mode 100644
index 00000000000..1fe5ed86e76
--- /dev/null
+++ b/test/wpt/tests/interfaces/EXT_texture_norm16.idl
@@ -0,0 +1,16 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: WebGL EXT_texture_norm16 Extension Specification (https://registry.khronos.org/webgl/extensions/EXT_texture_norm16/)
+
+[Exposed=(Window,Worker), LegacyNoInterfaceObject]
+interface EXT_texture_norm16 {
+  const GLenum R16_EXT = 0x822A;
+  const GLenum RG16_EXT = 0x822C;
+  const GLenum RGB16_EXT = 0x8054;
+  const GLenum RGBA16_EXT = 0x805B;
+  const GLenum R16_SNORM_EXT = 0x8F98;
+  const GLenum RG16_SNORM_EXT = 0x8F99;
+  const GLenum RGB16_SNORM_EXT = 0x8F9A;
+  const GLenum RGBA16_SNORM_EXT = 0x8F9B;
+};
diff --git a/test/wpt/tests/interfaces/FedCM.idl b/test/wpt/tests/interfaces/FedCM.idl
new file mode 100644
index 00000000000..b3ddb54e0c6
--- /dev/null
+++ b/test/wpt/tests/interfaces/FedCM.idl
@@ -0,0 +1,81 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Federated Credential Management API (https://fedidcg.github.io/FedCM/)
+
+dictionary IdentityProviderWellKnown {
+  required sequence<USVString> provider_urls;
+};
+
+dictionary IdentityProviderIcon {
+  required USVString url;
+  unsigned long size;
+};
+
+dictionary IdentityProviderBranding {
+  USVString background_color;
+  USVString color;
+  sequence<IdentityProviderIcon> icons;
+};
+
+dictionary IdentityProviderAPIConfig {
+  required USVString accounts_endpoint;
+  required USVString client_metadata_endpoint;
+  required USVString id_assertion_endpoint;
+  IdentityProviderBranding branding;
+};
+
+dictionary IdentityProviderAccount {
+  required USVString id;
+  required USVString name;
+  required USVString email;
+  USVString given_name;
+  sequence<USVString> approved_clients;
+};
+dictionary IdentityProviderAccountList {
+  sequence<IdentityProviderAccount> accounts;
+};
+
+dictionary IdentityProviderClientMetadata {
+  USVString privacy_policy_url;
+  USVString terms_of_service_url;
+};
+
+dictionary IdentityProviderToken {
+  required USVString token;
+};
+
+[Exposed=Window, SecureContext]
+interface IdentityCredential : Credential {
+  readonly attribute USVString? token;
+};
+
+partial dictionary CredentialRequestOptions {
+  IdentityCredentialRequestOptions identity;
+};
+
+dictionary IdentityCredentialRequestOptions {
+  sequence<IdentityProviderConfig> providers;
+};
+
+dictionary IdentityProviderConfig {
+  required USVString configURL;
+  required USVString clientId;
+  USVString nonce;
+};
+
+dictionary IdentityCredentialLogoutRPsRequest {
+  required USVString url;
+  required USVString accountId;
+};
+
+[Exposed=Window, SecureContext]
+partial interface IdentityCredential {
+  static Promise<undefined> logoutRPs(sequence<IdentityCredentialLogoutRPsRequest> logoutRequests);
+};
+
+[Exposed=Window, SecureContext]
+interface IdentityProvider {
+  static undefined login();
+  static undefined logout();
+};
diff --git a/test/wpt/tests/interfaces/IndexedDB.idl b/test/wpt/tests/interfaces/IndexedDB.idl
new file mode 100644
index 00000000000..d82391da7e6
--- /dev/null
+++ b/test/wpt/tests/interfaces/IndexedDB.idl
@@ -0,0 +1,226 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Indexed Database API 3.0 (https://w3c.github.io/IndexedDB/)
+
+[Exposed=(Window,Worker)]
+interface IDBRequest : EventTarget {
+  readonly attribute any result;
+  readonly attribute DOMException? error;
+  readonly attribute (IDBObjectStore or IDBIndex or IDBCursor)? source;
+  readonly attribute IDBTransaction? transaction;
+  readonly attribute IDBRequestReadyState readyState;
+
+  // Event handlers:
+  attribute EventHandler onsuccess;
+  attribute EventHandler onerror;
+};
+
+enum IDBRequestReadyState {
+  "pending",
+  "done"
+};
+
+[Exposed=(Window,Worker)]
+interface IDBOpenDBRequest : IDBRequest {
+  // Event handlers:
+  attribute EventHandler onblocked;
+  attribute EventHandler onupgradeneeded;
+};
+
+[Exposed=(Window,Worker)]
+interface IDBVersionChangeEvent : Event {
+  constructor(DOMString type, optional IDBVersionChangeEventInit eventInitDict = {});
+  readonly attribute unsigned long long oldVersion;
+  readonly attribute unsigned long long? newVersion;
+};
+
+dictionary IDBVersionChangeEventInit : EventInit {
+  unsigned long long oldVersion = 0;
+  unsigned long long? newVersion = null;
+};
+
+partial interface mixin WindowOrWorkerGlobalScope {
+  [SameObject] readonly attribute IDBFactory indexedDB;
+};
+
+[Exposed=(Window,Worker)]
+interface IDBFactory {
+  [NewObject] IDBOpenDBRequest open(DOMString name,
+                                    optional [EnforceRange] unsigned long long version);
+  [NewObject] IDBOpenDBRequest deleteDatabase(DOMString name);
+
+  Promise<sequence<IDBDatabaseInfo>> databases();
+
+  short cmp(any first, any second);
+};
+
+dictionary IDBDatabaseInfo {
+  DOMString name;
+  unsigned long long version;
+};
+
+[Exposed=(Window,Worker)]
+interface IDBDatabase : EventTarget {
+  readonly attribute DOMString name;
+  readonly attribute unsigned long long version;
+  readonly attribute DOMStringList objectStoreNames;
+
+  [NewObject] IDBTransaction transaction((DOMString or sequence<DOMString>) storeNames,
+                                         optional IDBTransactionMode mode = "readonly",
+                                         optional IDBTransactionOptions options = {});
+  undefined close();
+
+  [NewObject] IDBObjectStore createObjectStore(
+    DOMString name,
+    optional IDBObjectStoreParameters options = {});
+  undefined deleteObjectStore(DOMString name);
+
+  // Event handlers:
+  attribute EventHandler onabort;
+  attribute EventHandler onclose;
+  attribute EventHandler onerror;
+  attribute EventHandler onversionchange;
+};
+
+enum IDBTransactionDurability { "default", "strict", "relaxed" };
+
+dictionary IDBTransactionOptions {
+  IDBTransactionDurability durability = "default";
+};
+
+dictionary IDBObjectStoreParameters {
+  (DOMString or sequence<DOMString>)? keyPath = null;
+  boolean autoIncrement = false;
+};
+
+[Exposed=(Window,Worker)]
+interface IDBObjectStore {
+  attribute DOMString name;
+  readonly attribute any keyPath;
+  readonly attribute DOMStringList indexNames;
+  [SameObject] readonly attribute IDBTransaction transaction;
+  readonly attribute boolean autoIncrement;
+
+  [NewObject] IDBRequest put(any value, optional any key);
+  [NewObject] IDBRequest add(any value, optional any key);
+  [NewObject] IDBRequest delete(any query);
+  [NewObject] IDBRequest clear();
+  [NewObject] IDBRequest get(any query);
+  [NewObject] IDBRequest getKey(any query);
+  [NewObject] IDBRequest getAll(optional any query,
+                                optional [EnforceRange] unsigned long count);
+  [NewObject] IDBRequest getAllKeys(optional any query,
+                                    optional [EnforceRange] unsigned long count);
+  [NewObject] IDBRequest count(optional any query);
+
+  [NewObject] IDBRequest openCursor(optional any query,
+                                    optional IDBCursorDirection direction = "next");
+  [NewObject] IDBRequest openKeyCursor(optional any query,
+                                       optional IDBCursorDirection direction = "next");
+
+  IDBIndex index(DOMString name);
+
+  [NewObject] IDBIndex createIndex(DOMString name,
+                                   (DOMString or sequence<DOMString>) keyPath,
+                                   optional IDBIndexParameters options = {});
+  undefined deleteIndex(DOMString name);
+};
+
+dictionary IDBIndexParameters {
+  boolean unique = false;
+  boolean multiEntry = false;
+};
+
+[Exposed=(Window,Worker)]
+interface IDBIndex {
+  attribute DOMString name;
+  [SameObject] readonly attribute IDBObjectStore objectStore;
+  readonly attribute any keyPath;
+  readonly attribute boolean multiEntry;
+  readonly attribute boolean unique;
+
+  [NewObject] IDBRequest get(any query);
+  [NewObject] IDBRequest getKey(any query);
+  [NewObject] IDBRequest getAll(optional any query,
+                                optional [EnforceRange] unsigned long count);
+  [NewObject] IDBRequest getAllKeys(optional any query,
+                                    optional [EnforceRange] unsigned long count);
+  [NewObject] IDBRequest count(optional any query);
+
+  [NewObject] IDBRequest openCursor(optional any query,
+                                    optional IDBCursorDirection direction = "next");
+  [NewObject] IDBRequest openKeyCursor(optional any query,
+                                       optional IDBCursorDirection direction = "next");
+};
+
+[Exposed=(Window,Worker)]
+interface IDBKeyRange {
+  readonly attribute any lower;
+  readonly attribute any upper;
+  readonly attribute boolean lowerOpen;
+  readonly attribute boolean upperOpen;
+
+  // Static construction methods:
+  [NewObject] static IDBKeyRange only(any value);
+  [NewObject] static IDBKeyRange lowerBound(any lower, optional boolean open = false);
+  [NewObject] static IDBKeyRange upperBound(any upper, optional boolean open = false);
+  [NewObject] static IDBKeyRange bound(any lower,
+                                       any upper,
+                                       optional boolean lowerOpen = false,
+                                       optional boolean upperOpen = false);
+
+  boolean includes(any key);
+};
+
+[Exposed=(Window,Worker)]
+interface IDBCursor {
+  readonly attribute (IDBObjectStore or IDBIndex) source;
+  readonly attribute IDBCursorDirection direction;
+  readonly attribute any key;
+  readonly attribute any primaryKey;
+  [SameObject] readonly attribute IDBRequest request;
+
+  undefined advance([EnforceRange] unsigned long count);
+  undefined continue(optional any key);
+  undefined continuePrimaryKey(any key, any primaryKey);
+
+  [NewObject] IDBRequest update(any value);
+  [NewObject] IDBRequest delete();
+};
+
+enum IDBCursorDirection {
+  "next",
+  "nextunique",
+  "prev",
+  "prevunique"
+};
+
+[Exposed=(Window,Worker)]
+interface IDBCursorWithValue : IDBCursor {
+  readonly attribute any value;
+};
+
+[Exposed=(Window,Worker)]
+interface IDBTransaction : EventTarget {
+  readonly attribute DOMStringList objectStoreNames;
+  readonly attribute IDBTransactionMode mode;
+  readonly attribute IDBTransactionDurability durability;
+  [SameObject] readonly attribute IDBDatabase db;
+  readonly attribute DOMException? error;
+
+  IDBObjectStore objectStore(DOMString name);
+  undefined commit();
+  undefined abort();
+
+  // Event handlers:
+  attribute EventHandler onabort;
+  attribute EventHandler oncomplete;
+  attribute EventHandler onerror;
+};
+
+enum IDBTransactionMode {
+  "readonly",
+  "readwrite",
+  "versionchange"
+};
diff --git a/test/wpt/tests/interfaces/KHR_parallel_shader_compile.idl b/test/wpt/tests/interfaces/KHR_parallel_shader_compile.idl
new file mode 100644
index 00000000000..14709658e34
--- /dev/null
+++ b/test/wpt/tests/interfaces/KHR_parallel_shader_compile.idl
@@ -0,0 +1,9 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: WebGL KHR_parallel_shader_compile Extension Specification (https://registry.khronos.org/webgl/extensions/KHR_parallel_shader_compile/)
+
+[Exposed=(Window,Worker), LegacyNoInterfaceObject]
+interface KHR_parallel_shader_compile {
+  const GLenum COMPLETION_STATUS_KHR                = 0x91B1;
+};
diff --git a/test/wpt/tests/interfaces/META.yml b/test/wpt/tests/interfaces/META.yml
new file mode 100644
index 00000000000..c1dd8dddf9e
--- /dev/null
+++ b/test/wpt/tests/interfaces/META.yml
@@ -0,0 +1,2 @@
+suggested_reviewers:
+  - foolip
diff --git a/test/wpt/tests/interfaces/OES_draw_buffers_indexed.idl b/test/wpt/tests/interfaces/OES_draw_buffers_indexed.idl
new file mode 100644
index 00000000000..ea1e217a116
--- /dev/null
+++ b/test/wpt/tests/interfaces/OES_draw_buffers_indexed.idl
@@ -0,0 +1,26 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: WebGL OES_draw_buffers_indexed Extension Specification (https://registry.khronos.org/webgl/extensions/OES_draw_buffers_indexed/)
+
+[Exposed=(Window,Worker), LegacyNoInterfaceObject]
+interface OES_draw_buffers_indexed {
+  undefined enableiOES(GLenum target, GLuint index);
+
+  undefined disableiOES(GLenum target, GLuint index);
+
+  undefined blendEquationiOES(GLuint buf, GLenum mode);
+
+  undefined blendEquationSeparateiOES(GLuint buf,
+                                 GLenum modeRGB, GLenum modeAlpha);
+
+  undefined blendFunciOES(GLuint buf,
+                     GLenum src, GLenum dst);
+
+  undefined blendFuncSeparateiOES(GLuint buf,
+                             GLenum srcRGB, GLenum dstRGB,
+                             GLenum srcAlpha, GLenum dstAlpha);
+
+  undefined colorMaskiOES(GLuint buf,
+                     GLboolean r, GLboolean g, GLboolean b, GLboolean a);
+};
diff --git a/test/wpt/tests/interfaces/OES_element_index_uint.idl b/test/wpt/tests/interfaces/OES_element_index_uint.idl
new file mode 100644
index 00000000000..df43a57da80
--- /dev/null
+++ b/test/wpt/tests/interfaces/OES_element_index_uint.idl
@@ -0,0 +1,8 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: WebGL OES_element_index_uint Khronos Ratified Extension Specification (https://registry.khronos.org/webgl/extensions/OES_element_index_uint/)
+
+[Exposed=(Window,Worker), LegacyNoInterfaceObject]
+interface OES_element_index_uint {
+};
diff --git a/test/wpt/tests/interfaces/OES_fbo_render_mipmap.idl b/test/wpt/tests/interfaces/OES_fbo_render_mipmap.idl
new file mode 100644
index 00000000000..608c39291af
--- /dev/null
+++ b/test/wpt/tests/interfaces/OES_fbo_render_mipmap.idl
@@ -0,0 +1,8 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: WebGL OES_fbo_render_mipmap Extension Specification (https://registry.khronos.org/webgl/extensions/OES_fbo_render_mipmap/)
+
+[Exposed=(Window,Worker), LegacyNoInterfaceObject]
+interface OES_fbo_render_mipmap {
+};
diff --git a/test/wpt/tests/interfaces/OES_standard_derivatives.idl b/test/wpt/tests/interfaces/OES_standard_derivatives.idl
new file mode 100644
index 00000000000..7bf073a3f15
--- /dev/null
+++ b/test/wpt/tests/interfaces/OES_standard_derivatives.idl
@@ -0,0 +1,9 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: WebGL OES_standard_derivatives Khronos Ratified Extension Specification (https://registry.khronos.org/webgl/extensions/OES_standard_derivatives/)
+
+[Exposed=(Window,Worker), LegacyNoInterfaceObject]
+interface OES_standard_derivatives {
+    const GLenum FRAGMENT_SHADER_DERIVATIVE_HINT_OES = 0x8B8B;
+};
diff --git a/test/wpt/tests/interfaces/OES_texture_float.idl b/test/wpt/tests/interfaces/OES_texture_float.idl
new file mode 100644
index 00000000000..a1bb79cd5c5
--- /dev/null
+++ b/test/wpt/tests/interfaces/OES_texture_float.idl
@@ -0,0 +1,7 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: WebGL OES_texture_float Khronos Ratified Extension Specification (https://registry.khronos.org/webgl/extensions/OES_texture_float/)
+
+[Exposed=(Window,Worker), LegacyNoInterfaceObject]
+interface OES_texture_float { };
diff --git a/test/wpt/tests/interfaces/OES_texture_float_linear.idl b/test/wpt/tests/interfaces/OES_texture_float_linear.idl
new file mode 100644
index 00000000000..462629736de
--- /dev/null
+++ b/test/wpt/tests/interfaces/OES_texture_float_linear.idl
@@ -0,0 +1,7 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: WebGL OES_texture_float_linear Khronos Ratified Extension Specification (https://registry.khronos.org/webgl/extensions/OES_texture_float_linear/)
+
+[Exposed=(Window,Worker), LegacyNoInterfaceObject]
+interface OES_texture_float_linear { };
diff --git a/test/wpt/tests/interfaces/OES_texture_half_float.idl b/test/wpt/tests/interfaces/OES_texture_half_float.idl
new file mode 100644
index 00000000000..be414543628
--- /dev/null
+++ b/test/wpt/tests/interfaces/OES_texture_half_float.idl
@@ -0,0 +1,9 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: WebGL OES_texture_half_float Khronos Ratified Extension Specification (https://registry.khronos.org/webgl/extensions/OES_texture_half_float/)
+
+[Exposed=(Window,Worker), LegacyNoInterfaceObject]
+interface OES_texture_half_float {
+  const GLenum HALF_FLOAT_OES = 0x8D61;
+};
diff --git a/test/wpt/tests/interfaces/OES_texture_half_float_linear.idl b/test/wpt/tests/interfaces/OES_texture_half_float_linear.idl
new file mode 100644
index 00000000000..2f1a999b900
--- /dev/null
+++ b/test/wpt/tests/interfaces/OES_texture_half_float_linear.idl
@@ -0,0 +1,7 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: WebGL OES_texture_half_float_linear Khronos Ratified Extension Specification (https://registry.khronos.org/webgl/extensions/OES_texture_half_float_linear/)
+
+[Exposed=(Window,Worker), LegacyNoInterfaceObject]
+interface OES_texture_half_float_linear { };
diff --git a/test/wpt/tests/interfaces/OES_vertex_array_object.idl b/test/wpt/tests/interfaces/OES_vertex_array_object.idl
new file mode 100644
index 00000000000..8aeb7459f3b
--- /dev/null
+++ b/test/wpt/tests/interfaces/OES_vertex_array_object.idl
@@ -0,0 +1,18 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: WebGL OES_vertex_array_object Khronos Ratified Extension Specification (https://registry.khronos.org/webgl/extensions/OES_vertex_array_object/)
+
+[Exposed=(Window,Worker), LegacyNoInterfaceObject]
+interface WebGLVertexArrayObjectOES : WebGLObject {
+};
+
+[Exposed=(Window,Worker), LegacyNoInterfaceObject]
+interface OES_vertex_array_object {
+    const GLenum VERTEX_ARRAY_BINDING_OES = 0x85B5;
+
+    WebGLVertexArrayObjectOES? createVertexArrayOES();
+    undefined deleteVertexArrayOES(WebGLVertexArrayObjectOES? arrayObject);
+    [WebGLHandlesContextLoss] GLboolean isVertexArrayOES(WebGLVertexArrayObjectOES? arrayObject);
+    undefined bindVertexArrayOES(WebGLVertexArrayObjectOES? arrayObject);
+};
diff --git a/test/wpt/tests/interfaces/OVR_multiview2.idl b/test/wpt/tests/interfaces/OVR_multiview2.idl
new file mode 100644
index 00000000000..9c1ecc4246c
--- /dev/null
+++ b/test/wpt/tests/interfaces/OVR_multiview2.idl
@@ -0,0 +1,14 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: WebGL OVR_multiview2 Extension Specification (https://registry.khronos.org/webgl/extensions/OVR_multiview2/)
+
+[Exposed=(Window,Worker), LegacyNoInterfaceObject]
+interface OVR_multiview2 {
+    const GLenum FRAMEBUFFER_ATTACHMENT_TEXTURE_NUM_VIEWS_OVR = 0x9630;
+    const GLenum FRAMEBUFFER_ATTACHMENT_TEXTURE_BASE_VIEW_INDEX_OVR = 0x9632;
+    const GLenum MAX_VIEWS_OVR = 0x9631;
+    const GLenum FRAMEBUFFER_INCOMPLETE_VIEW_TARGETS_OVR = 0x9633;
+
+    undefined framebufferTextureMultiviewOVR(GLenum target, GLenum attachment, WebGLTexture? texture, GLint level, GLint baseViewIndex, GLsizei numViews);
+};
diff --git a/test/wpt/tests/interfaces/README.md b/test/wpt/tests/interfaces/README.md
new file mode 100644
index 00000000000..5e948ad955f
--- /dev/null
+++ b/test/wpt/tests/interfaces/README.md
@@ -0,0 +1,3 @@
+This directory contains [Web IDL](https://webidl.spec.whatwg.org/) interface definitions for use in idlharness.js tests.
+
+The `.idl` files (except `*.tentative.idl`) are copied from [@webref/idl](https://www.npmjs.com/package/@webref/idl) by a [workflow](https://github.com/web-platform-tests/wpt/blob/master/.github/workflows/interfaces.yml) that tries to sync the files daily. The resulting pull requests require manual review but can be approved/merged by anyone with write access.
diff --git a/test/wpt/tests/interfaces/SVG.idl b/test/wpt/tests/interfaces/SVG.idl
new file mode 100644
index 00000000000..3a0b86126b5
--- /dev/null
+++ b/test/wpt/tests/interfaces/SVG.idl
@@ -0,0 +1,693 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Scalable Vector Graphics (SVG) 2 (https://svgwg.org/svg2-draft/)
+
+[Exposed=Window]
+interface SVGElement : Element {
+
+  [SameObject] readonly attribute SVGAnimatedString className;
+
+  readonly attribute SVGSVGElement? ownerSVGElement;
+  readonly attribute SVGElement? viewportElement;
+};
+
+SVGElement includes GlobalEventHandlers;
+SVGElement includes SVGElementInstance;
+SVGElement includes HTMLOrSVGElement;
+
+dictionary SVGBoundingBoxOptions {
+  boolean fill = true;
+  boolean stroke = false;
+  boolean markers = false;
+  boolean clipped = false;
+};
+
+[Exposed=Window]
+interface SVGGraphicsElement : SVGElement {
+  [SameObject] readonly attribute SVGAnimatedTransformList transform;
+
+  DOMRect getBBox(optional SVGBoundingBoxOptions options = {});
+  DOMMatrix? getCTM();
+  DOMMatrix? getScreenCTM();
+};
+
+SVGGraphicsElement includes SVGTests;
+
+[Exposed=Window]
+interface SVGGeometryElement : SVGGraphicsElement {
+  [SameObject] readonly attribute SVGAnimatedNumber pathLength;
+
+  boolean isPointInFill(optional DOMPointInit point = {});
+  boolean isPointInStroke(optional DOMPointInit point = {});
+  float getTotalLength();
+  DOMPoint getPointAtLength(float distance);
+};
+
+[Exposed=Window]
+interface SVGNumber {
+  attribute float value;
+};
+
+[Exposed=Window]
+interface SVGLength {
+
+  // Length Unit Types
+  const unsigned short SVG_LENGTHTYPE_UNKNOWN = 0;
+  const unsigned short SVG_LENGTHTYPE_NUMBER = 1;
+  const unsigned short SVG_LENGTHTYPE_PERCENTAGE = 2;
+  const unsigned short SVG_LENGTHTYPE_EMS = 3;
+  const unsigned short SVG_LENGTHTYPE_EXS = 4;
+  const unsigned short SVG_LENGTHTYPE_PX = 5;
+  const unsigned short SVG_LENGTHTYPE_CM = 6;
+  const unsigned short SVG_LENGTHTYPE_MM = 7;
+  const unsigned short SVG_LENGTHTYPE_IN = 8;
+  const unsigned short SVG_LENGTHTYPE_PT = 9;
+  const unsigned short SVG_LENGTHTYPE_PC = 10;
+
+  readonly attribute unsigned short unitType;
+           attribute float value;
+           attribute float valueInSpecifiedUnits;
+           attribute DOMString valueAsString;
+
+  undefined newValueSpecifiedUnits(unsigned short unitType, float valueInSpecifiedUnits);
+  undefined convertToSpecifiedUnits(unsigned short unitType);
+};
+
+[Exposed=Window]
+interface SVGAngle {
+
+  // Angle Unit Types
+  const unsigned short SVG_ANGLETYPE_UNKNOWN = 0;
+  const unsigned short SVG_ANGLETYPE_UNSPECIFIED = 1;
+  const unsigned short SVG_ANGLETYPE_DEG = 2;
+  const unsigned short SVG_ANGLETYPE_RAD = 3;
+  const unsigned short SVG_ANGLETYPE_GRAD = 4;
+
+  readonly attribute unsigned short unitType;
+           attribute float value;
+           attribute float valueInSpecifiedUnits;
+           attribute DOMString valueAsString;
+
+  undefined newValueSpecifiedUnits(unsigned short unitType, float valueInSpecifiedUnits);
+  undefined convertToSpecifiedUnits(unsigned short unitType);
+};
+
+[Exposed=Window]
+interface SVGNumberList {
+
+  readonly attribute unsigned long length;
+  readonly attribute unsigned long numberOfItems;
+
+  undefined clear();
+  SVGNumber initialize(SVGNumber newItem);
+  getter SVGNumber getItem(unsigned long index);
+  SVGNumber insertItemBefore(SVGNumber newItem, unsigned long index);
+  SVGNumber replaceItem(SVGNumber newItem, unsigned long index);
+  SVGNumber removeItem(unsigned long index);
+  SVGNumber appendItem(SVGNumber newItem);
+  setter undefined (unsigned long index, SVGNumber newItem);
+};
+
+[Exposed=Window]
+interface SVGLengthList {
+
+  readonly attribute unsigned long length;
+  readonly attribute unsigned long numberOfItems;
+
+  undefined clear();
+  SVGLength initialize(SVGLength newItem);
+  getter SVGLength getItem(unsigned long index);
+  SVGLength insertItemBefore(SVGLength newItem, unsigned long index);
+  SVGLength replaceItem(SVGLength newItem, unsigned long index);
+  SVGLength removeItem(unsigned long index);
+  SVGLength appendItem(SVGLength newItem);
+  setter undefined (unsigned long index, SVGLength newItem);
+};
+
+[Exposed=Window]
+interface SVGStringList {
+
+  readonly attribute unsigned long length;
+  readonly attribute unsigned long numberOfItems;
+
+  undefined clear();
+  DOMString initialize(DOMString newItem);
+  getter DOMString getItem(unsigned long index);
+  DOMString insertItemBefore(DOMString newItem, unsigned long index);
+  DOMString replaceItem(DOMString newItem, unsigned long index);
+  DOMString removeItem(unsigned long index);
+  DOMString appendItem(DOMString newItem);
+  setter undefined (unsigned long index, DOMString newItem);
+};
+
+[Exposed=Window]
+interface SVGAnimatedBoolean {
+           attribute boolean baseVal;
+  readonly attribute boolean animVal;
+};
+
+[Exposed=Window]
+interface SVGAnimatedEnumeration {
+           attribute unsigned short baseVal;
+  readonly attribute unsigned short animVal;
+};
+
+[Exposed=Window]
+interface SVGAnimatedInteger {
+           attribute long baseVal;
+  readonly attribute long animVal;
+};
+
+[Exposed=Window]
+interface SVGAnimatedNumber {
+           attribute float baseVal;
+  readonly attribute float animVal;
+};
+
+[Exposed=Window]
+interface SVGAnimatedLength {
+  [SameObject] readonly attribute SVGLength baseVal;
+  [SameObject] readonly attribute SVGLength animVal;
+};
+
+[Exposed=Window]
+interface SVGAnimatedAngle {
+  [SameObject] readonly attribute SVGAngle baseVal;
+  [SameObject] readonly attribute SVGAngle animVal;
+};
+
+[Exposed=Window]
+interface SVGAnimatedString {
+           attribute DOMString baseVal;
+  readonly attribute DOMString animVal;
+};
+
+[Exposed=Window]
+interface SVGAnimatedRect {
+  [SameObject] readonly attribute DOMRect baseVal;
+  [SameObject] readonly attribute DOMRectReadOnly animVal;
+};
+
+[Exposed=Window]
+interface SVGAnimatedNumberList {
+  [SameObject] readonly attribute SVGNumberList baseVal;
+  [SameObject] readonly attribute SVGNumberList animVal;
+};
+
+[Exposed=Window]
+interface SVGAnimatedLengthList {
+  [SameObject] readonly attribute SVGLengthList baseVal;
+  [SameObject] readonly attribute SVGLengthList animVal;
+};
+
+[Exposed=Window]
+interface SVGUnitTypes {
+  // Unit Types
+  const unsigned short SVG_UNIT_TYPE_UNKNOWN = 0;
+  const unsigned short SVG_UNIT_TYPE_USERSPACEONUSE = 1;
+  const unsigned short SVG_UNIT_TYPE_OBJECTBOUNDINGBOX = 2;
+};
+
+interface mixin SVGTests {
+  [SameObject] readonly attribute SVGStringList requiredExtensions;
+  [SameObject] readonly attribute SVGStringList systemLanguage;
+};
+
+interface mixin SVGFitToViewBox {
+  [SameObject] readonly attribute SVGAnimatedRect viewBox;
+  [SameObject] readonly attribute SVGAnimatedPreserveAspectRatio preserveAspectRatio;
+};
+
+interface mixin SVGURIReference {
+  [SameObject] readonly attribute SVGAnimatedString href;
+};
+
+partial interface Document {
+  readonly attribute SVGSVGElement? rootElement;
+};
+
+[Exposed=Window]
+interface SVGSVGElement : SVGGraphicsElement {
+
+  [SameObject] readonly attribute SVGAnimatedLength x;
+  [SameObject] readonly attribute SVGAnimatedLength y;
+  [SameObject] readonly attribute SVGAnimatedLength width;
+  [SameObject] readonly attribute SVGAnimatedLength height;
+
+  attribute float currentScale;
+  [SameObject] readonly attribute DOMPointReadOnly currentTranslate;
+
+  NodeList getIntersectionList(DOMRectReadOnly rect, SVGElement? referenceElement);
+  NodeList getEnclosureList(DOMRectReadOnly rect, SVGElement? referenceElement);
+  boolean checkIntersection(SVGElement element, DOMRectReadOnly rect);
+  boolean checkEnclosure(SVGElement element, DOMRectReadOnly rect);
+
+  undefined deselectAll();
+
+  SVGNumber createSVGNumber();
+  SVGLength createSVGLength();
+  SVGAngle createSVGAngle();
+  DOMPoint createSVGPoint();
+  DOMMatrix createSVGMatrix();
+  DOMRect createSVGRect();
+  SVGTransform createSVGTransform();
+  SVGTransform createSVGTransformFromMatrix(optional DOMMatrix2DInit matrix = {});
+
+  Element getElementById(DOMString elementId);
+
+  // Deprecated methods that have no effect when called,
+  // but which are kept for compatibility reasons.
+  unsigned long suspendRedraw(unsigned long maxWaitMilliseconds);
+  undefined unsuspendRedraw(unsigned long suspendHandleID);
+  undefined unsuspendRedrawAll();
+  undefined forceRedraw();
+};
+
+SVGSVGElement includes SVGFitToViewBox;
+SVGSVGElement includes WindowEventHandlers;
+
+[Exposed=Window]
+interface SVGGElement : SVGGraphicsElement {
+};
+
+[Exposed=Window]
+interface SVGDefsElement : SVGGraphicsElement {
+};
+
+[Exposed=Window]
+interface SVGDescElement : SVGElement {
+};
+
+[Exposed=Window]
+interface SVGMetadataElement : SVGElement {
+};
+
+[Exposed=Window]
+interface SVGTitleElement : SVGElement {
+};
+
+[Exposed=Window]
+interface SVGSymbolElement : SVGGraphicsElement {
+};
+
+SVGSymbolElement includes SVGFitToViewBox;
+
+[Exposed=Window]
+interface SVGUseElement : SVGGraphicsElement {
+  [SameObject] readonly attribute SVGAnimatedLength x;
+  [SameObject] readonly attribute SVGAnimatedLength y;
+  [SameObject] readonly attribute SVGAnimatedLength width;
+  [SameObject] readonly attribute SVGAnimatedLength height;
+  [SameObject] readonly attribute SVGElement? instanceRoot;
+  [SameObject] readonly attribute SVGElement? animatedInstanceRoot;
+};
+
+SVGUseElement includes SVGURIReference;
+
+[Exposed=Window]
+interface SVGUseElementShadowRoot : ShadowRoot {
+};
+
+interface mixin SVGElementInstance {
+  [SameObject] readonly attribute SVGElement? correspondingElement;
+  [SameObject] readonly attribute SVGUseElement? correspondingUseElement;
+};
+
+[Exposed=Window]
+interface ShadowAnimation : Animation {
+  constructor(Animation source, (Element or CSSPseudoElement) newTarget);
+  [SameObject] readonly attribute Animation sourceAnimation;
+};
+
+[Exposed=Window]
+interface SVGSwitchElement : SVGGraphicsElement {
+};
+
+interface mixin GetSVGDocument {
+  Document getSVGDocument();
+};
+
+[Exposed=Window]
+interface SVGStyleElement : SVGElement {
+  attribute DOMString type;
+  attribute DOMString media;
+  attribute DOMString title;
+};
+
+SVGStyleElement includes LinkStyle;
+
+[Exposed=Window]
+interface SVGTransform {
+
+  // Transform Types
+  const unsigned short SVG_TRANSFORM_UNKNOWN = 0;
+  const unsigned short SVG_TRANSFORM_MATRIX = 1;
+  const unsigned short SVG_TRANSFORM_TRANSLATE = 2;
+  const unsigned short SVG_TRANSFORM_SCALE = 3;
+  const unsigned short SVG_TRANSFORM_ROTATE = 4;
+  const unsigned short SVG_TRANSFORM_SKEWX = 5;
+  const unsigned short SVG_TRANSFORM_SKEWY = 6;
+
+  readonly attribute unsigned short type;
+  [SameObject] readonly attribute DOMMatrix matrix;
+  readonly attribute float angle;
+
+  undefined setMatrix(optional DOMMatrix2DInit matrix = {});
+  undefined setTranslate(float tx, float ty);
+  undefined setScale(float sx, float sy);
+  undefined setRotate(float angle, float cx, float cy);
+  undefined setSkewX(float angle);
+  undefined setSkewY(float angle);
+};
+
+[Exposed=Window]
+interface SVGTransformList {
+
+  readonly attribute unsigned long length;
+  readonly attribute unsigned long numberOfItems;
+
+  undefined clear();
+  SVGTransform initialize(SVGTransform newItem);
+  getter SVGTransform getItem(unsigned long index);
+  SVGTransform insertItemBefore(SVGTransform newItem, unsigned long index);
+  SVGTransform replaceItem(SVGTransform newItem, unsigned long index);
+  SVGTransform removeItem(unsigned long index);
+  SVGTransform appendItem(SVGTransform newItem);
+  setter undefined (unsigned long index, SVGTransform newItem);
+
+  // Additional methods not common to other list interfaces.
+  SVGTransform createSVGTransformFromMatrix(optional DOMMatrix2DInit matrix = {});
+  SVGTransform? consolidate();
+};
+
+[Exposed=Window]
+interface SVGAnimatedTransformList {
+  [SameObject] readonly attribute SVGTransformList baseVal;
+  [SameObject] readonly attribute SVGTransformList animVal;
+};
+
+[Exposed=Window]
+interface SVGPreserveAspectRatio {
+
+  // Alignment Types
+  const unsigned short SVG_PRESERVEASPECTRATIO_UNKNOWN = 0;
+  const unsigned short SVG_PRESERVEASPECTRATIO_NONE = 1;
+  const unsigned short SVG_PRESERVEASPECTRATIO_XMINYMIN = 2;
+  const unsigned short SVG_PRESERVEASPECTRATIO_XMIDYMIN = 3;
+  const unsigned short SVG_PRESERVEASPECTRATIO_XMAXYMIN = 4;
+  const unsigned short SVG_PRESERVEASPECTRATIO_XMINYMID = 5;
+  const unsigned short SVG_PRESERVEASPECTRATIO_XMIDYMID = 6;
+  const unsigned short SVG_PRESERVEASPECTRATIO_XMAXYMID = 7;
+  const unsigned short SVG_PRESERVEASPECTRATIO_XMINYMAX = 8;
+  const unsigned short SVG_PRESERVEASPECTRATIO_XMIDYMAX = 9;
+  const unsigned short SVG_PRESERVEASPECTRATIO_XMAXYMAX = 10;
+
+  // Meet-or-slice Types
+  const unsigned short SVG_MEETORSLICE_UNKNOWN = 0;
+  const unsigned short SVG_MEETORSLICE_MEET = 1;
+  const unsigned short SVG_MEETORSLICE_SLICE = 2;
+
+  attribute unsigned short align;
+  attribute unsigned short meetOrSlice;
+};
+
+[Exposed=Window]
+interface SVGAnimatedPreserveAspectRatio {
+  [SameObject] readonly attribute SVGPreserveAspectRatio baseVal;
+  [SameObject] readonly attribute SVGPreserveAspectRatio animVal;
+};
+
+[Exposed=Window]
+interface SVGPathElement : SVGGeometryElement {
+};
+
+[Exposed=Window]
+interface SVGRectElement : SVGGeometryElement {
+  [SameObject] readonly attribute SVGAnimatedLength x;
+  [SameObject] readonly attribute SVGAnimatedLength y;
+  [SameObject] readonly attribute SVGAnimatedLength width;
+  [SameObject] readonly attribute SVGAnimatedLength height;
+  [SameObject] readonly attribute SVGAnimatedLength rx;
+  [SameObject] readonly attribute SVGAnimatedLength ry;
+};
+
+[Exposed=Window]
+interface SVGCircleElement : SVGGeometryElement {
+  [SameObject] readonly attribute SVGAnimatedLength cx;
+  [SameObject] readonly attribute SVGAnimatedLength cy;
+  [SameObject] readonly attribute SVGAnimatedLength r;
+};
+
+[Exposed=Window]
+interface SVGEllipseElement : SVGGeometryElement {
+  [SameObject] readonly attribute SVGAnimatedLength cx;
+  [SameObject] readonly attribute SVGAnimatedLength cy;
+  [SameObject] readonly attribute SVGAnimatedLength rx;
+  [SameObject] readonly attribute SVGAnimatedLength ry;
+};
+
+[Exposed=Window]
+interface SVGLineElement : SVGGeometryElement {
+  [SameObject] readonly attribute SVGAnimatedLength x1;
+  [SameObject] readonly attribute SVGAnimatedLength y1;
+  [SameObject] readonly attribute SVGAnimatedLength x2;
+  [SameObject] readonly attribute SVGAnimatedLength y2;
+};
+
+interface mixin SVGAnimatedPoints {
+  [SameObject] readonly attribute SVGPointList points;
+  [SameObject] readonly attribute SVGPointList animatedPoints;
+};
+
+[Exposed=Window]
+interface SVGPointList {
+
+  readonly attribute unsigned long length;
+  readonly attribute unsigned long numberOfItems;
+
+  undefined clear();
+  DOMPoint initialize(DOMPoint newItem);
+  getter DOMPoint getItem(unsigned long index);
+  DOMPoint insertItemBefore(DOMPoint newItem, unsigned long index);
+  DOMPoint replaceItem(DOMPoint newItem, unsigned long index);
+  DOMPoint removeItem(unsigned long index);
+  DOMPoint appendItem(DOMPoint newItem);
+  setter undefined (unsigned long index, DOMPoint newItem);
+};
+
+[Exposed=Window]
+interface SVGPolylineElement : SVGGeometryElement {
+};
+
+SVGPolylineElement includes SVGAnimatedPoints;
+
+[Exposed=Window]
+interface SVGPolygonElement : SVGGeometryElement {
+};
+
+SVGPolygonElement includes SVGAnimatedPoints;
+
+[Exposed=Window]
+interface SVGTextContentElement : SVGGraphicsElement {
+
+  // lengthAdjust Types
+  const unsigned short LENGTHADJUST_UNKNOWN = 0;
+  const unsigned short LENGTHADJUST_SPACING = 1;
+  const unsigned short LENGTHADJUST_SPACINGANDGLYPHS = 2;
+
+  [SameObject] readonly attribute SVGAnimatedLength textLength;
+  [SameObject] readonly attribute SVGAnimatedEnumeration lengthAdjust;
+
+  long getNumberOfChars();
+  float getComputedTextLength();
+  float getSubStringLength(unsigned long charnum, unsigned long nchars);
+  DOMPoint getStartPositionOfChar(unsigned long charnum);
+  DOMPoint getEndPositionOfChar(unsigned long charnum);
+  DOMRect getExtentOfChar(unsigned long charnum);
+  float getRotationOfChar(unsigned long charnum);
+  long getCharNumAtPosition(optional DOMPointInit point = {});
+  undefined selectSubString(unsigned long charnum, unsigned long nchars);
+};
+
+[Exposed=Window]
+interface SVGTextPositioningElement : SVGTextContentElement {
+  [SameObject] readonly attribute SVGAnimatedLengthList x;
+  [SameObject] readonly attribute SVGAnimatedLengthList y;
+  [SameObject] readonly attribute SVGAnimatedLengthList dx;
+  [SameObject] readonly attribute SVGAnimatedLengthList dy;
+  [SameObject] readonly attribute SVGAnimatedNumberList rotate;
+};
+
+[Exposed=Window]
+interface SVGTextElement : SVGTextPositioningElement {
+};
+
+[Exposed=Window]
+interface SVGTSpanElement : SVGTextPositioningElement {
+};
+
+[Exposed=Window]
+interface SVGTextPathElement : SVGTextContentElement {
+
+  // textPath Method Types
+  const unsigned short TEXTPATH_METHODTYPE_UNKNOWN = 0;
+  const unsigned short TEXTPATH_METHODTYPE_ALIGN = 1;
+  const unsigned short TEXTPATH_METHODTYPE_STRETCH = 2;
+
+  // textPath Spacing Types
+  const unsigned short TEXTPATH_SPACINGTYPE_UNKNOWN = 0;
+  const unsigned short TEXTPATH_SPACINGTYPE_AUTO = 1;
+  const unsigned short TEXTPATH_SPACINGTYPE_EXACT = 2;
+
+  [SameObject] readonly attribute SVGAnimatedLength startOffset;
+  [SameObject] readonly attribute SVGAnimatedEnumeration method;
+  [SameObject] readonly attribute SVGAnimatedEnumeration spacing;
+};
+
+SVGTextPathElement includes SVGURIReference;
+
+[Exposed=Window]
+interface SVGImageElement : SVGGraphicsElement {
+  [SameObject] readonly attribute SVGAnimatedLength x;
+  [SameObject] readonly attribute SVGAnimatedLength y;
+  [SameObject] readonly attribute SVGAnimatedLength width;
+  [SameObject] readonly attribute SVGAnimatedLength height;
+  [SameObject] readonly attribute SVGAnimatedPreserveAspectRatio preserveAspectRatio;
+  attribute DOMString? crossOrigin;
+};
+
+SVGImageElement includes SVGURIReference;
+
+[Exposed=Window]
+interface SVGForeignObjectElement : SVGGraphicsElement {
+  [SameObject] readonly attribute SVGAnimatedLength x;
+  [SameObject] readonly attribute SVGAnimatedLength y;
+  [SameObject] readonly attribute SVGAnimatedLength width;
+  [SameObject] readonly attribute SVGAnimatedLength height;
+};
+
+[Exposed=Window]
+interface SVGMarkerElement : SVGElement {
+
+  // Marker Unit Types
+  const unsigned short SVG_MARKERUNITS_UNKNOWN = 0;
+  const unsigned short SVG_MARKERUNITS_USERSPACEONUSE = 1;
+  const unsigned short SVG_MARKERUNITS_STROKEWIDTH = 2;
+
+  // Marker Orientation Types
+  const unsigned short SVG_MARKER_ORIENT_UNKNOWN = 0;
+  const unsigned short SVG_MARKER_ORIENT_AUTO = 1;
+  const unsigned short SVG_MARKER_ORIENT_ANGLE = 2;
+
+  [SameObject] readonly attribute SVGAnimatedLength refX;
+  [SameObject] readonly attribute SVGAnimatedLength refY;
+  [SameObject] readonly attribute SVGAnimatedEnumeration markerUnits;
+  [SameObject] readonly attribute SVGAnimatedLength markerWidth;
+  [SameObject] readonly attribute SVGAnimatedLength markerHeight;
+  [SameObject] readonly attribute SVGAnimatedEnumeration orientType;
+  [SameObject] readonly attribute SVGAnimatedAngle orientAngle;
+  attribute DOMString orient;
+
+  undefined setOrientToAuto();
+  undefined setOrientToAngle(SVGAngle angle);
+};
+
+SVGMarkerElement includes SVGFitToViewBox;
+
+[Exposed=Window]
+interface SVGGradientElement : SVGElement {
+
+  // Spread Method Types
+  const unsigned short SVG_SPREADMETHOD_UNKNOWN = 0;
+  const unsigned short SVG_SPREADMETHOD_PAD = 1;
+  const unsigned short SVG_SPREADMETHOD_REFLECT = 2;
+  const unsigned short SVG_SPREADMETHOD_REPEAT = 3;
+
+  [SameObject] readonly attribute SVGAnimatedEnumeration gradientUnits;
+  [SameObject] readonly attribute SVGAnimatedTransformList gradientTransform;
+  [SameObject] readonly attribute SVGAnimatedEnumeration spreadMethod;
+};
+
+SVGGradientElement includes SVGURIReference;
+
+[Exposed=Window]
+interface SVGLinearGradientElement : SVGGradientElement {
+  [SameObject] readonly attribute SVGAnimatedLength x1;
+  [SameObject] readonly attribute SVGAnimatedLength y1;
+  [SameObject] readonly attribute SVGAnimatedLength x2;
+  [SameObject] readonly attribute SVGAnimatedLength y2;
+};
+
+[Exposed=Window]
+interface SVGRadialGradientElement : SVGGradientElement {
+  [SameObject] readonly attribute SVGAnimatedLength cx;
+  [SameObject] readonly attribute SVGAnimatedLength cy;
+  [SameObject] readonly attribute SVGAnimatedLength r;
+  [SameObject] readonly attribute SVGAnimatedLength fx;
+  [SameObject] readonly attribute SVGAnimatedLength fy;
+  [SameObject] readonly attribute SVGAnimatedLength fr;
+};
+
+[Exposed=Window]
+interface SVGStopElement : SVGElement {
+  [SameObject] readonly attribute SVGAnimatedNumber offset;
+};
+
+[Exposed=Window]
+interface SVGPatternElement : SVGElement {
+  [SameObject] readonly attribute SVGAnimatedEnumeration patternUnits;
+  [SameObject] readonly attribute SVGAnimatedEnumeration patternContentUnits;
+  [SameObject] readonly attribute SVGAnimatedTransformList patternTransform;
+  [SameObject] readonly attribute SVGAnimatedLength x;
+  [SameObject] readonly attribute SVGAnimatedLength y;
+  [SameObject] readonly attribute SVGAnimatedLength width;
+  [SameObject] readonly attribute SVGAnimatedLength height;
+};
+
+SVGPatternElement includes SVGFitToViewBox;
+SVGPatternElement includes SVGURIReference;
+
+[Exposed=Window]
+interface SVGScriptElement : SVGElement {
+  attribute DOMString type;
+  attribute DOMString? crossOrigin;
+};
+
+SVGScriptElement includes SVGURIReference;
+
+[Exposed=Window]
+interface SVGAElement : SVGGraphicsElement {
+  [SameObject] readonly attribute SVGAnimatedString target;
+  attribute DOMString download;
+  attribute USVString ping;
+  attribute DOMString rel;
+  [SameObject, PutForwards=value] readonly attribute DOMTokenList relList;
+  attribute DOMString hreflang;
+  attribute DOMString type;
+
+  attribute DOMString text;
+
+  attribute DOMString referrerPolicy;
+};
+
+SVGAElement includes SVGURIReference;
+
+// Inline HTMLHyperlinkElementUtils except href, which conflicts.
+partial interface SVGAElement {
+  readonly attribute USVString origin;
+  [CEReactions] attribute USVString protocol;
+  [CEReactions] attribute USVString username;
+  [CEReactions] attribute USVString password;
+  [CEReactions] attribute USVString host;
+  [CEReactions] attribute USVString hostname;
+  [CEReactions] attribute USVString port;
+  [CEReactions] attribute USVString pathname;
+  [CEReactions] attribute USVString search;
+  [CEReactions] attribute USVString hash;
+};
+
+[Exposed=Window]
+interface SVGViewElement : SVGElement {};
+
+SVGViewElement includes SVGFitToViewBox;
diff --git a/test/wpt/tests/interfaces/WEBGL_blend_equation_advanced_coherent.idl b/test/wpt/tests/interfaces/WEBGL_blend_equation_advanced_coherent.idl
new file mode 100644
index 00000000000..2208329ded1
--- /dev/null
+++ b/test/wpt/tests/interfaces/WEBGL_blend_equation_advanced_coherent.idl
@@ -0,0 +1,23 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: WebGL WEBGL_blend_equation_advanced_coherent Extension Draft Specification (https://registry.khronos.org/webgl/extensions/WEBGL_blend_equation_advanced_coherent/)
+
+[Exposed=(Window,Worker), LegacyNoInterfaceObject]
+interface WEBGL_blend_equation_advanced_coherent  {
+  const GLenum MULTIPLY       = 0x9294;
+  const GLenum SCREEN         = 0x9295;
+  const GLenum OVERLAY        = 0x9296;
+  const GLenum DARKEN         = 0x9297;
+  const GLenum LIGHTEN        = 0x9298;
+  const GLenum COLORDODGE     = 0x9299;
+  const GLenum COLORBURN      = 0x929A;
+  const GLenum HARDLIGHT      = 0x929B;
+  const GLenum SOFTLIGHT      = 0x929C;
+  const GLenum DIFFERENCE     = 0x929E;
+  const GLenum EXCLUSION      = 0x92A0;
+  const GLenum HSL_HUE        = 0x92AD;
+  const GLenum HSL_SATURATION = 0x92AE;
+  const GLenum HSL_COLOR      = 0x92AF;
+  const GLenum HSL_LUMINOSITY = 0x92B0;
+};
diff --git a/test/wpt/tests/interfaces/WEBGL_color_buffer_float.idl b/test/wpt/tests/interfaces/WEBGL_color_buffer_float.idl
new file mode 100644
index 00000000000..b73f63153da
--- /dev/null
+++ b/test/wpt/tests/interfaces/WEBGL_color_buffer_float.idl
@@ -0,0 +1,11 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: WebGL WEBGL_color_buffer_float Extension Specification (https://registry.khronos.org/webgl/extensions/WEBGL_color_buffer_float/)
+
+[Exposed=(Window,Worker), LegacyNoInterfaceObject]
+interface WEBGL_color_buffer_float {
+  const GLenum RGBA32F_EXT = 0x8814;
+  const GLenum FRAMEBUFFER_ATTACHMENT_COMPONENT_TYPE_EXT = 0x8211;
+  const GLenum UNSIGNED_NORMALIZED_EXT = 0x8C17;
+}; // interface WEBGL_color_buffer_float
diff --git a/test/wpt/tests/interfaces/WEBGL_compressed_texture_astc.idl b/test/wpt/tests/interfaces/WEBGL_compressed_texture_astc.idl
new file mode 100644
index 00000000000..9e4632ff7e7
--- /dev/null
+++ b/test/wpt/tests/interfaces/WEBGL_compressed_texture_astc.idl
@@ -0,0 +1,41 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: WebGL WEBGL_compressed_texture_astc Extension Specification (https://registry.khronos.org/webgl/extensions/WEBGL_compressed_texture_astc/)
+
+[Exposed=(Window,Worker), LegacyNoInterfaceObject]
+interface WEBGL_compressed_texture_astc {
+    /* Compressed Texture Format */
+    const GLenum COMPRESSED_RGBA_ASTC_4x4_KHR = 0x93B0;
+    const GLenum COMPRESSED_RGBA_ASTC_5x4_KHR = 0x93B1;
+    const GLenum COMPRESSED_RGBA_ASTC_5x5_KHR = 0x93B2;
+    const GLenum COMPRESSED_RGBA_ASTC_6x5_KHR = 0x93B3;
+    const GLenum COMPRESSED_RGBA_ASTC_6x6_KHR = 0x93B4;
+    const GLenum COMPRESSED_RGBA_ASTC_8x5_KHR = 0x93B5;
+    const GLenum COMPRESSED_RGBA_ASTC_8x6_KHR = 0x93B6;
+    const GLenum COMPRESSED_RGBA_ASTC_8x8_KHR = 0x93B7;
+    const GLenum COMPRESSED_RGBA_ASTC_10x5_KHR = 0x93B8;
+    const GLenum COMPRESSED_RGBA_ASTC_10x6_KHR = 0x93B9;
+    const GLenum COMPRESSED_RGBA_ASTC_10x8_KHR = 0x93BA;
+    const GLenum COMPRESSED_RGBA_ASTC_10x10_KHR = 0x93BB;
+    const GLenum COMPRESSED_RGBA_ASTC_12x10_KHR = 0x93BC;
+    const GLenum COMPRESSED_RGBA_ASTC_12x12_KHR = 0x93BD;
+
+    const GLenum COMPRESSED_SRGB8_ALPHA8_ASTC_4x4_KHR = 0x93D0;
+    const GLenum COMPRESSED_SRGB8_ALPHA8_ASTC_5x4_KHR = 0x93D1;
+    const GLenum COMPRESSED_SRGB8_ALPHA8_ASTC_5x5_KHR = 0x93D2;
+    const GLenum COMPRESSED_SRGB8_ALPHA8_ASTC_6x5_KHR = 0x93D3;
+    const GLenum COMPRESSED_SRGB8_ALPHA8_ASTC_6x6_KHR = 0x93D4;
+    const GLenum COMPRESSED_SRGB8_ALPHA8_ASTC_8x5_KHR = 0x93D5;
+    const GLenum COMPRESSED_SRGB8_ALPHA8_ASTC_8x6_KHR = 0x93D6;
+    const GLenum COMPRESSED_SRGB8_ALPHA8_ASTC_8x8_KHR = 0x93D7;
+    const GLenum COMPRESSED_SRGB8_ALPHA8_ASTC_10x5_KHR = 0x93D8;
+    const GLenum COMPRESSED_SRGB8_ALPHA8_ASTC_10x6_KHR = 0x93D9;
+    const GLenum COMPRESSED_SRGB8_ALPHA8_ASTC_10x8_KHR = 0x93DA;
+    const GLenum COMPRESSED_SRGB8_ALPHA8_ASTC_10x10_KHR = 0x93DB;
+    const GLenum COMPRESSED_SRGB8_ALPHA8_ASTC_12x10_KHR = 0x93DC;
+    const GLenum COMPRESSED_SRGB8_ALPHA8_ASTC_12x12_KHR = 0x93DD;
+
+    // Profile query support.
+    sequence<DOMString> getSupportedProfiles();
+};
diff --git a/test/wpt/tests/interfaces/WEBGL_compressed_texture_etc.idl b/test/wpt/tests/interfaces/WEBGL_compressed_texture_etc.idl
new file mode 100644
index 00000000000..5174a085461
--- /dev/null
+++ b/test/wpt/tests/interfaces/WEBGL_compressed_texture_etc.idl
@@ -0,0 +1,19 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: WebGL WEBGL_compressed_texture_etc Extension Specification (https://registry.khronos.org/webgl/extensions/WEBGL_compressed_texture_etc/)
+
+[Exposed=(Window,Worker), LegacyNoInterfaceObject]
+interface WEBGL_compressed_texture_etc {
+    /* Compressed Texture Formats */
+    const GLenum COMPRESSED_R11_EAC                        = 0x9270;
+    const GLenum COMPRESSED_SIGNED_R11_EAC                 = 0x9271;
+    const GLenum COMPRESSED_RG11_EAC                       = 0x9272;
+    const GLenum COMPRESSED_SIGNED_RG11_EAC                = 0x9273;
+    const GLenum COMPRESSED_RGB8_ETC2                      = 0x9274;
+    const GLenum COMPRESSED_SRGB8_ETC2                     = 0x9275;
+    const GLenum COMPRESSED_RGB8_PUNCHTHROUGH_ALPHA1_ETC2  = 0x9276;
+    const GLenum COMPRESSED_SRGB8_PUNCHTHROUGH_ALPHA1_ETC2 = 0x9277;
+    const GLenum COMPRESSED_RGBA8_ETC2_EAC                 = 0x9278;
+    const GLenum COMPRESSED_SRGB8_ALPHA8_ETC2_EAC          = 0x9279;
+};
diff --git a/test/wpt/tests/interfaces/WEBGL_compressed_texture_etc1.idl b/test/wpt/tests/interfaces/WEBGL_compressed_texture_etc1.idl
new file mode 100644
index 00000000000..773697e4504
--- /dev/null
+++ b/test/wpt/tests/interfaces/WEBGL_compressed_texture_etc1.idl
@@ -0,0 +1,10 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: WebGL WEBGL_compressed_texture_etc1 Extension Specification (https://registry.khronos.org/webgl/extensions/WEBGL_compressed_texture_etc1/)
+
+[Exposed=(Window,Worker), LegacyNoInterfaceObject]
+interface WEBGL_compressed_texture_etc1 {
+    /* Compressed Texture Format */
+    const GLenum COMPRESSED_RGB_ETC1_WEBGL = 0x8D64;
+};
diff --git a/test/wpt/tests/interfaces/WEBGL_compressed_texture_pvrtc.idl b/test/wpt/tests/interfaces/WEBGL_compressed_texture_pvrtc.idl
new file mode 100644
index 00000000000..5aa004af80e
--- /dev/null
+++ b/test/wpt/tests/interfaces/WEBGL_compressed_texture_pvrtc.idl
@@ -0,0 +1,13 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: WebGL WEBGL_compressed_texture_pvrtc Extension Specification (https://registry.khronos.org/webgl/extensions/WEBGL_compressed_texture_pvrtc/)
+
+[Exposed=(Window,Worker), LegacyNoInterfaceObject]
+interface WEBGL_compressed_texture_pvrtc {
+    /* Compressed Texture Formats */
+    const GLenum COMPRESSED_RGB_PVRTC_4BPPV1_IMG      = 0x8C00;
+    const GLenum COMPRESSED_RGB_PVRTC_2BPPV1_IMG      = 0x8C01;
+    const GLenum COMPRESSED_RGBA_PVRTC_4BPPV1_IMG     = 0x8C02;
+    const GLenum COMPRESSED_RGBA_PVRTC_2BPPV1_IMG     = 0x8C03;
+};
diff --git a/test/wpt/tests/interfaces/WEBGL_compressed_texture_s3tc.idl b/test/wpt/tests/interfaces/WEBGL_compressed_texture_s3tc.idl
new file mode 100644
index 00000000000..6e7c4bd89ef
--- /dev/null
+++ b/test/wpt/tests/interfaces/WEBGL_compressed_texture_s3tc.idl
@@ -0,0 +1,13 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: WebGL WEBGL_compressed_texture_s3tc Khronos Ratified Extension Specification (https://registry.khronos.org/webgl/extensions/WEBGL_compressed_texture_s3tc/)
+
+[Exposed=(Window,Worker), LegacyNoInterfaceObject]
+interface WEBGL_compressed_texture_s3tc {
+    /* Compressed Texture Formats */
+    const GLenum COMPRESSED_RGB_S3TC_DXT1_EXT        = 0x83F0;
+    const GLenum COMPRESSED_RGBA_S3TC_DXT1_EXT       = 0x83F1;
+    const GLenum COMPRESSED_RGBA_S3TC_DXT3_EXT       = 0x83F2;
+    const GLenum COMPRESSED_RGBA_S3TC_DXT5_EXT       = 0x83F3;
+};
diff --git a/test/wpt/tests/interfaces/WEBGL_compressed_texture_s3tc_srgb.idl b/test/wpt/tests/interfaces/WEBGL_compressed_texture_s3tc_srgb.idl
new file mode 100644
index 00000000000..809265e68da
--- /dev/null
+++ b/test/wpt/tests/interfaces/WEBGL_compressed_texture_s3tc_srgb.idl
@@ -0,0 +1,13 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: WebGL WEBGL_compressed_texture_s3tc_srgb Extension Specification (https://registry.khronos.org/webgl/extensions/WEBGL_compressed_texture_s3tc_srgb/)
+
+[Exposed=(Window,Worker), LegacyNoInterfaceObject]
+interface WEBGL_compressed_texture_s3tc_srgb {
+    /* Compressed Texture Formats */
+    const GLenum COMPRESSED_SRGB_S3TC_DXT1_EXT        = 0x8C4C;
+    const GLenum COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT  = 0x8C4D;
+    const GLenum COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT  = 0x8C4E;
+    const GLenum COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT  = 0x8C4F;
+};
diff --git a/test/wpt/tests/interfaces/WEBGL_debug_renderer_info.idl b/test/wpt/tests/interfaces/WEBGL_debug_renderer_info.idl
new file mode 100644
index 00000000000..769406151dc
--- /dev/null
+++ b/test/wpt/tests/interfaces/WEBGL_debug_renderer_info.idl
@@ -0,0 +1,12 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: WebGL WEBGL_debug_renderer_info Khronos Ratified Extension Specification (https://registry.khronos.org/webgl/extensions/WEBGL_debug_renderer_info/)
+
+[Exposed=(Window,Worker), LegacyNoInterfaceObject]
+interface WEBGL_debug_renderer_info {
+
+      const GLenum UNMASKED_VENDOR_WEBGL            = 0x9245;
+      const GLenum UNMASKED_RENDERER_WEBGL          = 0x9246;
+
+};
diff --git a/test/wpt/tests/interfaces/WEBGL_debug_shaders.idl b/test/wpt/tests/interfaces/WEBGL_debug_shaders.idl
new file mode 100644
index 00000000000..ecb48d0b1df
--- /dev/null
+++ b/test/wpt/tests/interfaces/WEBGL_debug_shaders.idl
@@ -0,0 +1,11 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: WebGL WEBGL_debug_shaders Khronos Ratified Extension Specification (https://registry.khronos.org/webgl/extensions/WEBGL_debug_shaders/)
+
+[Exposed=(Window,Worker), LegacyNoInterfaceObject]
+interface WEBGL_debug_shaders {
+
+      DOMString getTranslatedShaderSource(WebGLShader shader);
+
+};
diff --git a/test/wpt/tests/interfaces/WEBGL_depth_texture.idl b/test/wpt/tests/interfaces/WEBGL_depth_texture.idl
new file mode 100644
index 00000000000..a9ec791ad08
--- /dev/null
+++ b/test/wpt/tests/interfaces/WEBGL_depth_texture.idl
@@ -0,0 +1,9 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: WebGL WEBGL_depth_texture Khronos Ratified Extension Specification (https://registry.khronos.org/webgl/extensions/WEBGL_depth_texture/)
+
+[Exposed=(Window,Worker), LegacyNoInterfaceObject]
+interface WEBGL_depth_texture {
+  const GLenum UNSIGNED_INT_24_8_WEBGL = 0x84FA;
+};
diff --git a/test/wpt/tests/interfaces/WEBGL_draw_buffers.idl b/test/wpt/tests/interfaces/WEBGL_draw_buffers.idl
new file mode 100644
index 00000000000..3310388f6ec
--- /dev/null
+++ b/test/wpt/tests/interfaces/WEBGL_draw_buffers.idl
@@ -0,0 +1,46 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: WebGL WEBGL_draw_buffers Khronos Ratified Extension Specification (https://registry.khronos.org/webgl/extensions/WEBGL_draw_buffers/)
+
+[Exposed=(Window,Worker), LegacyNoInterfaceObject]
+interface WEBGL_draw_buffers {
+    const GLenum COLOR_ATTACHMENT0_WEBGL     = 0x8CE0;
+    const GLenum COLOR_ATTACHMENT1_WEBGL     = 0x8CE1;
+    const GLenum COLOR_ATTACHMENT2_WEBGL     = 0x8CE2;
+    const GLenum COLOR_ATTACHMENT3_WEBGL     = 0x8CE3;
+    const GLenum COLOR_ATTACHMENT4_WEBGL     = 0x8CE4;
+    const GLenum COLOR_ATTACHMENT5_WEBGL     = 0x8CE5;
+    const GLenum COLOR_ATTACHMENT6_WEBGL     = 0x8CE6;
+    const GLenum COLOR_ATTACHMENT7_WEBGL     = 0x8CE7;
+    const GLenum COLOR_ATTACHMENT8_WEBGL     = 0x8CE8;
+    const GLenum COLOR_ATTACHMENT9_WEBGL     = 0x8CE9;
+    const GLenum COLOR_ATTACHMENT10_WEBGL    = 0x8CEA;
+    const GLenum COLOR_ATTACHMENT11_WEBGL    = 0x8CEB;
+    const GLenum COLOR_ATTACHMENT12_WEBGL    = 0x8CEC;
+    const GLenum COLOR_ATTACHMENT13_WEBGL    = 0x8CED;
+    const GLenum COLOR_ATTACHMENT14_WEBGL    = 0x8CEE;
+    const GLenum COLOR_ATTACHMENT15_WEBGL    = 0x8CEF;
+
+    const GLenum DRAW_BUFFER0_WEBGL          = 0x8825;
+    const GLenum DRAW_BUFFER1_WEBGL          = 0x8826;
+    const GLenum DRAW_BUFFER2_WEBGL          = 0x8827;
+    const GLenum DRAW_BUFFER3_WEBGL          = 0x8828;
+    const GLenum DRAW_BUFFER4_WEBGL          = 0x8829;
+    const GLenum DRAW_BUFFER5_WEBGL          = 0x882A;
+    const GLenum DRAW_BUFFER6_WEBGL          = 0x882B;
+    const GLenum DRAW_BUFFER7_WEBGL          = 0x882C;
+    const GLenum DRAW_BUFFER8_WEBGL          = 0x882D;
+    const GLenum DRAW_BUFFER9_WEBGL          = 0x882E;
+    const GLenum DRAW_BUFFER10_WEBGL         = 0x882F;
+    const GLenum DRAW_BUFFER11_WEBGL         = 0x8830;
+    const GLenum DRAW_BUFFER12_WEBGL         = 0x8831;
+    const GLenum DRAW_BUFFER13_WEBGL         = 0x8832;
+    const GLenum DRAW_BUFFER14_WEBGL         = 0x8833;
+    const GLenum DRAW_BUFFER15_WEBGL         = 0x8834;
+
+    const GLenum MAX_COLOR_ATTACHMENTS_WEBGL = 0x8CDF;
+    const GLenum MAX_DRAW_BUFFERS_WEBGL      = 0x8824;
+
+    undefined drawBuffersWEBGL(sequence<GLenum> buffers);
+};
diff --git a/test/wpt/tests/interfaces/WEBGL_draw_instanced_base_vertex_base_instance.idl b/test/wpt/tests/interfaces/WEBGL_draw_instanced_base_vertex_base_instance.idl
new file mode 100644
index 00000000000..38f7a42a11f
--- /dev/null
+++ b/test/wpt/tests/interfaces/WEBGL_draw_instanced_base_vertex_base_instance.idl
@@ -0,0 +1,14 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: WebGL WEBGL_draw_instanced_base_vertex_base_instance Extension Draft Specification (https://registry.khronos.org/webgl/extensions/WEBGL_draw_instanced_base_vertex_base_instance/)
+
+[Exposed=(Window,Worker), LegacyNoInterfaceObject]
+interface WEBGL_draw_instanced_base_vertex_base_instance {
+  undefined drawArraysInstancedBaseInstanceWEBGL(
+      GLenum mode, GLint first, GLsizei count,
+      GLsizei instanceCount, GLuint baseInstance);
+  undefined drawElementsInstancedBaseVertexBaseInstanceWEBGL(
+      GLenum mode, GLsizei count, GLenum type, GLintptr offset,
+      GLsizei instanceCount, GLint baseVertex, GLuint baseInstance);
+};
diff --git a/test/wpt/tests/interfaces/WEBGL_lose_context.idl b/test/wpt/tests/interfaces/WEBGL_lose_context.idl
new file mode 100644
index 00000000000..ee68fb5c09f
--- /dev/null
+++ b/test/wpt/tests/interfaces/WEBGL_lose_context.idl
@@ -0,0 +1,10 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: WebGL WEBGL_lose_context Khronos Ratified Extension Specification (https://registry.khronos.org/webgl/extensions/WEBGL_lose_context/)
+
+[Exposed=(Window,Worker), LegacyNoInterfaceObject]
+interface WEBGL_lose_context {
+      undefined loseContext();
+      undefined restoreContext();
+};
diff --git a/test/wpt/tests/interfaces/WEBGL_multi_draw.idl b/test/wpt/tests/interfaces/WEBGL_multi_draw.idl
new file mode 100644
index 00000000000..ee8c044b529
--- /dev/null
+++ b/test/wpt/tests/interfaces/WEBGL_multi_draw.idl
@@ -0,0 +1,32 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: WebGL WEBGL_multi_draw Extension Specification (https://registry.khronos.org/webgl/extensions/WEBGL_multi_draw/)
+
+[Exposed=(Window,Worker), LegacyNoInterfaceObject]
+interface WEBGL_multi_draw {
+  undefined multiDrawArraysWEBGL(
+      GLenum mode,
+      ([AllowShared] Int32Array or sequence<GLint>) firstsList, GLuint firstsOffset,
+      ([AllowShared] Int32Array or sequence<GLsizei>) countsList, GLuint countsOffset,
+      GLsizei drawcount);
+  undefined multiDrawElementsWEBGL(
+      GLenum mode,
+      ([AllowShared] Int32Array or sequence<GLsizei>) countsList, GLuint countsOffset,
+      GLenum type,
+      ([AllowShared] Int32Array or sequence<GLsizei>) offsetsList, GLuint offsetsOffset,
+      GLsizei drawcount);
+  undefined multiDrawArraysInstancedWEBGL(
+      GLenum mode,
+      ([AllowShared] Int32Array or sequence<GLint>) firstsList, GLuint firstsOffset,
+      ([AllowShared] Int32Array or sequence<GLsizei>) countsList, GLuint countsOffset,
+      ([AllowShared] Int32Array or sequence<GLsizei>) instanceCountsList, GLuint instanceCountsOffset,
+      GLsizei drawcount);
+  undefined multiDrawElementsInstancedWEBGL(
+      GLenum mode,
+      ([AllowShared] Int32Array or sequence<GLsizei>) countsList, GLuint countsOffset,
+      GLenum type,
+      ([AllowShared] Int32Array or sequence<GLsizei>) offsetsList, GLuint offsetsOffset,
+      ([AllowShared] Int32Array or sequence<GLsizei>) instanceCountsList, GLuint instanceCountsOffset,
+      GLsizei drawcount);
+};
diff --git a/test/wpt/tests/interfaces/WEBGL_multi_draw_instanced_base_vertex_base_instance.idl b/test/wpt/tests/interfaces/WEBGL_multi_draw_instanced_base_vertex_base_instance.idl
new file mode 100644
index 00000000000..2258fa9a10c
--- /dev/null
+++ b/test/wpt/tests/interfaces/WEBGL_multi_draw_instanced_base_vertex_base_instance.idl
@@ -0,0 +1,26 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: WebGL WEBGL_multi_draw_instanced_base_vertex_base_instance Extension Draft Specification (https://registry.khronos.org/webgl/extensions/WEBGL_multi_draw_instanced_base_vertex_base_instance/)
+
+[Exposed=(Window,Worker), LegacyNoInterfaceObject]
+interface WEBGL_multi_draw_instanced_base_vertex_base_instance {
+  undefined multiDrawArraysInstancedBaseInstanceWEBGL(
+      GLenum mode,
+      ([AllowShared] Int32Array or sequence<GLint>) firstsList, GLuint firstsOffset,
+      ([AllowShared] Int32Array or sequence<GLsizei>) countsList, GLuint countsOffset,
+      ([AllowShared] Int32Array or sequence<GLsizei>) instanceCountsList, GLuint instanceCountsOffset,
+      ([AllowShared] Uint32Array or sequence<GLuint>) baseInstancesList, GLuint baseInstancesOffset,
+      GLsizei drawcount
+  );
+  undefined multiDrawElementsInstancedBaseVertexBaseInstanceWEBGL(
+      GLenum mode,
+      ([AllowShared] Int32Array or sequence<GLsizei>) countsList, GLuint countsOffset,
+      GLenum type,
+      ([AllowShared] Int32Array or sequence<GLsizei>) offsetsList, GLuint offsetsOffset,
+      ([AllowShared] Int32Array or sequence<GLsizei>) instanceCountsList, GLuint instanceCountsOffset,
+      ([AllowShared] Int32Array or sequence<GLint>) baseVerticesList, GLuint baseVerticesOffset,
+      ([AllowShared] Uint32Array or sequence<GLuint>) baseInstancesList, GLuint baseInstancesOffset,
+      GLsizei drawcount
+  );
+};
diff --git a/test/wpt/tests/interfaces/WebCryptoAPI.idl b/test/wpt/tests/interfaces/WebCryptoAPI.idl
new file mode 100644
index 00000000000..0e68ea82f59
--- /dev/null
+++ b/test/wpt/tests/interfaces/WebCryptoAPI.idl
@@ -0,0 +1,237 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Web Cryptography API (https://w3c.github.io/webcrypto/)
+
+partial interface mixin WindowOrWorkerGlobalScope {
+  [SameObject] readonly attribute Crypto crypto;
+};
+
+[Exposed=(Window,Worker)]
+interface Crypto {
+  [SecureContext] readonly attribute SubtleCrypto subtle;
+  ArrayBufferView getRandomValues(ArrayBufferView array);
+  [SecureContext] DOMString randomUUID();
+};
+
+typedef (object or DOMString) AlgorithmIdentifier;
+
+typedef AlgorithmIdentifier HashAlgorithmIdentifier;
+
+dictionary Algorithm {
+  required DOMString name;
+};
+
+dictionary KeyAlgorithm {
+  required DOMString name;
+};
+
+enum KeyType { "public", "private", "secret" };
+
+enum KeyUsage { "encrypt", "decrypt", "sign", "verify", "deriveKey", "deriveBits", "wrapKey", "unwrapKey" };
+
+[SecureContext,Exposed=(Window,Worker),Serializable]
+interface CryptoKey {
+  readonly attribute KeyType type;
+  readonly attribute boolean extractable;
+  readonly attribute object algorithm;
+  readonly attribute object usages;
+};
+
+enum KeyFormat { "raw", "spki", "pkcs8", "jwk" };
+
+[SecureContext,Exposed=(Window,Worker)]
+interface SubtleCrypto {
+  Promise<any> encrypt(AlgorithmIdentifier algorithm,
+                       CryptoKey key,
+                       BufferSource data);
+  Promise<any> decrypt(AlgorithmIdentifier algorithm,
+                       CryptoKey key,
+                       BufferSource data);
+  Promise<any> sign(AlgorithmIdentifier algorithm,
+                    CryptoKey key,
+                    BufferSource data);
+  Promise<any> verify(AlgorithmIdentifier algorithm,
+                      CryptoKey key,
+                      BufferSource signature,
+                      BufferSource data);
+  Promise<any> digest(AlgorithmIdentifier algorithm,
+                      BufferSource data);
+
+  Promise<any> generateKey(AlgorithmIdentifier algorithm,
+                          boolean extractable,
+                          sequence<KeyUsage> keyUsages );
+  Promise<any> deriveKey(AlgorithmIdentifier algorithm,
+                         CryptoKey baseKey,
+                         AlgorithmIdentifier derivedKeyType,
+                         boolean extractable,
+                         sequence<KeyUsage> keyUsages );
+  Promise<ArrayBuffer> deriveBits(AlgorithmIdentifier algorithm,
+                          CryptoKey baseKey,
+                          unsigned long length);
+
+  Promise<CryptoKey> importKey(KeyFormat format,
+                         (BufferSource or JsonWebKey) keyData,
+                         AlgorithmIdentifier algorithm,
+                         boolean extractable,
+                         sequence<KeyUsage> keyUsages );
+  Promise<any> exportKey(KeyFormat format, CryptoKey key);
+
+  Promise<any> wrapKey(KeyFormat format,
+                       CryptoKey key,
+                       CryptoKey wrappingKey,
+                       AlgorithmIdentifier wrapAlgorithm);
+  Promise<CryptoKey> unwrapKey(KeyFormat format,
+                         BufferSource wrappedKey,
+                         CryptoKey unwrappingKey,
+                         AlgorithmIdentifier unwrapAlgorithm,
+                         AlgorithmIdentifier unwrappedKeyAlgorithm,
+                         boolean extractable,
+                         sequence<KeyUsage> keyUsages );
+};
+
+dictionary RsaOtherPrimesInfo {
+  // The following fields are defined in Section 6.3.2.7 of JSON Web Algorithms
+  DOMString r;
+  DOMString d;
+  DOMString t;
+};
+
+dictionary JsonWebKey {
+  // The following fields are defined in Section 3.1 of JSON Web Key
+  DOMString kty;
+  DOMString use;
+  sequence<DOMString> key_ops;
+  DOMString alg;
+
+  // The following fields are defined in JSON Web Key Parameters Registration
+  boolean ext;
+
+  // The following fields are defined in Section 6 of JSON Web Algorithms
+  DOMString crv;
+  DOMString x;
+  DOMString y;
+  DOMString d;
+  DOMString n;
+  DOMString e;
+  DOMString p;
+  DOMString q;
+  DOMString dp;
+  DOMString dq;
+  DOMString qi;
+  sequence<RsaOtherPrimesInfo> oth;
+  DOMString k;
+};
+
+typedef Uint8Array BigInteger;
+
+dictionary CryptoKeyPair {
+  CryptoKey publicKey;
+  CryptoKey privateKey;
+};
+
+dictionary RsaKeyGenParams : Algorithm {
+  required [EnforceRange] unsigned long modulusLength;
+  required BigInteger publicExponent;
+};
+
+dictionary RsaHashedKeyGenParams : RsaKeyGenParams {
+  required HashAlgorithmIdentifier hash;
+};
+
+dictionary RsaKeyAlgorithm : KeyAlgorithm {
+  required unsigned long modulusLength;
+  required BigInteger publicExponent;
+};
+
+dictionary RsaHashedKeyAlgorithm : RsaKeyAlgorithm {
+  required KeyAlgorithm hash;
+};
+
+dictionary RsaHashedImportParams : Algorithm {
+  required HashAlgorithmIdentifier hash;
+};
+
+dictionary RsaPssParams : Algorithm {
+  required [EnforceRange] unsigned long saltLength;
+};
+
+dictionary RsaOaepParams : Algorithm {
+  BufferSource label;
+};
+
+dictionary EcdsaParams : Algorithm {
+  required HashAlgorithmIdentifier hash;
+};
+
+typedef DOMString NamedCurve;
+
+dictionary EcKeyGenParams : Algorithm {
+  required NamedCurve namedCurve;
+};
+
+dictionary EcKeyAlgorithm : KeyAlgorithm {
+  required NamedCurve namedCurve;
+};
+
+dictionary EcKeyImportParams : Algorithm {
+  required NamedCurve namedCurve;
+};
+
+dictionary EcdhKeyDeriveParams : Algorithm {
+  required CryptoKey public;
+};
+
+dictionary AesCtrParams : Algorithm {
+  required BufferSource counter;
+  required [EnforceRange] octet length;
+};
+
+dictionary AesKeyAlgorithm : KeyAlgorithm {
+  required unsigned short length;
+};
+
+dictionary AesKeyGenParams : Algorithm {
+  required [EnforceRange] unsigned short length;
+};
+
+dictionary AesDerivedKeyParams : Algorithm {
+  required [EnforceRange] unsigned short length;
+};
+
+dictionary AesCbcParams : Algorithm {
+  required BufferSource iv;
+};
+
+dictionary AesGcmParams : Algorithm {
+  required BufferSource iv;
+  BufferSource additionalData;
+  [EnforceRange] octet tagLength;
+};
+
+dictionary HmacImportParams : Algorithm {
+  required HashAlgorithmIdentifier hash;
+  [EnforceRange] unsigned long length;
+};
+
+dictionary HmacKeyAlgorithm : KeyAlgorithm {
+  required KeyAlgorithm hash;
+  required unsigned long length;
+};
+
+dictionary HmacKeyGenParams : Algorithm {
+  required HashAlgorithmIdentifier hash;
+  [EnforceRange] unsigned long length;
+};
+
+dictionary HkdfParams : Algorithm {
+  required HashAlgorithmIdentifier hash;
+  required BufferSource salt;
+  required BufferSource info;
+};
+
+dictionary Pbkdf2Params : Algorithm {
+  required BufferSource salt;
+  required [EnforceRange] unsigned long iterations;
+  required HashAlgorithmIdentifier hash;
+};
diff --git a/test/wpt/tests/interfaces/accelerometer.idl b/test/wpt/tests/interfaces/accelerometer.idl
new file mode 100644
index 00000000000..fc8fc07ff77
--- /dev/null
+++ b/test/wpt/tests/interfaces/accelerometer.idl
@@ -0,0 +1,40 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Accelerometer (https://w3c.github.io/accelerometer/)
+
+[SecureContext, Exposed=Window]
+interface Accelerometer : Sensor {
+  constructor(optional AccelerometerSensorOptions options = {});
+  readonly attribute double? x;
+  readonly attribute double? y;
+  readonly attribute double? z;
+};
+
+enum AccelerometerLocalCoordinateSystem { "device", "screen" };
+
+dictionary AccelerometerSensorOptions : SensorOptions {
+  AccelerometerLocalCoordinateSystem referenceFrame = "device";
+};
+
+[SecureContext, Exposed=Window]
+interface LinearAccelerationSensor : Accelerometer {
+  constructor(optional AccelerometerSensorOptions options = {});
+};
+
+[SecureContext, Exposed=Window]
+interface GravitySensor : Accelerometer {
+  constructor(optional AccelerometerSensorOptions options = {});
+};
+
+dictionary AccelerometerReadingValues {
+  required double? x;
+  required double? y;
+  required double? z;
+};
+
+dictionary LinearAccelerationReadingValues : AccelerometerReadingValues {
+};
+
+dictionary GravityReadingValues : AccelerometerReadingValues {
+};
diff --git a/test/wpt/tests/interfaces/ambient-light.idl b/test/wpt/tests/interfaces/ambient-light.idl
new file mode 100644
index 00000000000..6d9c8e03eaa
--- /dev/null
+++ b/test/wpt/tests/interfaces/ambient-light.idl
@@ -0,0 +1,14 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Ambient Light Sensor (https://w3c.github.io/ambient-light/)
+
+[SecureContext, Exposed=Window]
+interface AmbientLightSensor : Sensor {
+  constructor(optional SensorOptions sensorOptions = {});
+  readonly attribute double? illuminance;
+};
+
+dictionary AmbientLightReadingValues {
+  required double? illuminance;
+};
diff --git a/test/wpt/tests/interfaces/anchors.idl b/test/wpt/tests/interfaces/anchors.idl
new file mode 100644
index 00000000000..5aa9395f09f
--- /dev/null
+++ b/test/wpt/tests/interfaces/anchors.idl
@@ -0,0 +1,35 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: WebXR Anchors Module (https://immersive-web.github.io/anchors/)
+
+[SecureContext, Exposed=Window]
+interface XRAnchor {
+  readonly attribute XRSpace anchorSpace;
+
+  Promise<DOMString> requestPersistentHandle();
+
+  undefined delete();
+};
+
+partial interface XRFrame {
+  Promise<XRAnchor> createAnchor(XRRigidTransform pose, XRSpace space);
+};
+
+partial interface XRSession {
+  Promise<XRAnchor> restorePersistentAnchor(DOMString uuid);
+  Promise<undefined> deletePersistentAnchor(DOMString uuid);
+};
+
+partial interface XRHitTestResult {
+  Promise<XRAnchor> createAnchor();
+};
+
+[Exposed=Window]
+interface XRAnchorSet {
+  readonly setlike<XRAnchor>;
+};
+
+partial interface XRFrame {
+  [SameObject] readonly attribute XRAnchorSet trackedAnchors;
+};
diff --git a/test/wpt/tests/interfaces/attribution-reporting-api.idl b/test/wpt/tests/interfaces/attribution-reporting-api.idl
new file mode 100644
index 00000000000..76640f54c8d
--- /dev/null
+++ b/test/wpt/tests/interfaces/attribution-reporting-api.idl
@@ -0,0 +1,12 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Attribution Reporting (https://wicg.github.io/attribution-reporting-api/)
+
+interface mixin HTMLAttributionSrcElementUtils {
+    [CEReactions] attribute USVString attributionSrc;
+};
+
+HTMLAnchorElement includes HTMLAttributionSrcElementUtils;
+HTMLImageElement includes HTMLAttributionSrcElementUtils;
+HTMLScriptElement includes HTMLAttributionSrcElementUtils;
diff --git a/test/wpt/tests/interfaces/audio-output.idl b/test/wpt/tests/interfaces/audio-output.idl
new file mode 100644
index 00000000000..80ceb225308
--- /dev/null
+++ b/test/wpt/tests/interfaces/audio-output.idl
@@ -0,0 +1,17 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Audio Output Devices API (https://w3c.github.io/mediacapture-output/)
+
+partial interface HTMLMediaElement {
+  [SecureContext] readonly attribute DOMString sinkId;
+  [SecureContext] Promise<undefined> setSinkId (DOMString sinkId);
+};
+
+partial interface MediaDevices {
+  Promise<MediaDeviceInfo> selectAudioOutput(optional AudioOutputOptions options = {});
+};
+
+dictionary AudioOutputOptions {
+  DOMString deviceId = "";
+};
diff --git a/test/wpt/tests/interfaces/autoplay-detection.idl b/test/wpt/tests/interfaces/autoplay-detection.idl
new file mode 100644
index 00000000000..cd0884fe521
--- /dev/null
+++ b/test/wpt/tests/interfaces/autoplay-detection.idl
@@ -0,0 +1,19 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Autoplay Policy Detection (https://w3c.github.io/autoplay/)
+
+enum AutoplayPolicy {
+  "allowed",
+  "allowed-muted",
+  "disallowed"
+};
+
+enum AutoplayPolicyMediaType { "mediaelement", "audiocontext" };
+
+[Exposed=Window]
+partial interface Navigator {
+  AutoplayPolicy getAutoplayPolicy(AutoplayPolicyMediaType type);
+  AutoplayPolicy getAutoplayPolicy(HTMLMediaElement element);
+  AutoplayPolicy getAutoplayPolicy(AudioContext context);
+};
diff --git a/test/wpt/tests/interfaces/background-fetch.idl b/test/wpt/tests/interfaces/background-fetch.idl
new file mode 100644
index 00000000000..993bd8bc2fd
--- /dev/null
+++ b/test/wpt/tests/interfaces/background-fetch.idl
@@ -0,0 +1,89 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Background Fetch (https://wicg.github.io/background-fetch/)
+
+partial interface ServiceWorkerGlobalScope {
+  attribute EventHandler onbackgroundfetchsuccess;
+  attribute EventHandler onbackgroundfetchfail;
+  attribute EventHandler onbackgroundfetchabort;
+  attribute EventHandler onbackgroundfetchclick;
+};
+
+partial interface ServiceWorkerRegistration {
+  readonly attribute BackgroundFetchManager backgroundFetch;
+};
+
+[Exposed=(Window,Worker)]
+interface BackgroundFetchManager {
+  Promise<BackgroundFetchRegistration> fetch(DOMString id, (RequestInfo or sequence<RequestInfo>) requests, optional BackgroundFetchOptions options = {});
+  Promise<BackgroundFetchRegistration?> get(DOMString id);
+  Promise<sequence<DOMString>> getIds();
+};
+
+dictionary BackgroundFetchUIOptions {
+  sequence<ImageResource> icons;
+  DOMString title;
+};
+
+dictionary BackgroundFetchOptions : BackgroundFetchUIOptions {
+  unsigned long long downloadTotal = 0;
+};
+
+[Exposed=(Window,Worker)]
+interface BackgroundFetchRegistration : EventTarget {
+  readonly attribute DOMString id;
+  readonly attribute unsigned long long uploadTotal;
+  readonly attribute unsigned long long uploaded;
+  readonly attribute unsigned long long downloadTotal;
+  readonly attribute unsigned long long downloaded;
+  readonly attribute BackgroundFetchResult result;
+  readonly attribute BackgroundFetchFailureReason failureReason;
+  readonly attribute boolean recordsAvailable;
+
+  attribute EventHandler onprogress;
+
+  Promise<boolean> abort();
+  Promise<BackgroundFetchRecord> match(RequestInfo request, optional CacheQueryOptions options = {});
+  Promise<sequence<BackgroundFetchRecord>> matchAll(optional RequestInfo request, optional CacheQueryOptions options = {});
+};
+
+enum BackgroundFetchResult { "", "success", "failure" };
+
+enum BackgroundFetchFailureReason {
+  // The background fetch has not completed yet, or was successful.
+  "",
+  // The operation was aborted by the user, or abort() was called.
+  "aborted",
+  // A response had a not-ok-status.
+  "bad-status",
+  // A fetch failed for other reasons, e.g. CORS, MIX, an invalid partial response,
+  // or a general network failure for a fetch that cannot be retried.
+  "fetch-error",
+  // Storage quota was reached during the operation.
+  "quota-exceeded",
+  // The provided downloadTotal was exceeded.
+  "download-total-exceeded"
+};
+
+[Exposed=(Window,Worker)]
+interface BackgroundFetchRecord {
+  readonly attribute Request request;
+  readonly attribute Promise<Response> responseReady;
+};
+
+[Exposed=ServiceWorker]
+interface BackgroundFetchEvent : ExtendableEvent {
+  constructor(DOMString type, BackgroundFetchEventInit init);
+  readonly attribute BackgroundFetchRegistration registration;
+};
+
+dictionary BackgroundFetchEventInit : ExtendableEventInit {
+  required BackgroundFetchRegistration registration;
+};
+
+[Exposed=ServiceWorker]
+interface BackgroundFetchUpdateUIEvent : BackgroundFetchEvent {
+  constructor(DOMString type, BackgroundFetchEventInit init);
+  Promise<undefined> updateUI(optional BackgroundFetchUIOptions options = {});
+};
diff --git a/test/wpt/tests/interfaces/background-sync.idl b/test/wpt/tests/interfaces/background-sync.idl
new file mode 100644
index 00000000000..79a13a617af
--- /dev/null
+++ b/test/wpt/tests/interfaces/background-sync.idl
@@ -0,0 +1,30 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Web Background Synchronization (https://wicg.github.io/background-sync/spec/)
+
+partial interface ServiceWorkerRegistration {
+  readonly attribute SyncManager sync;
+};
+
+[Exposed=(Window,Worker)]
+interface SyncManager {
+  Promise<undefined> register(DOMString tag);
+  Promise<sequence<DOMString>> getTags();
+};
+
+partial interface ServiceWorkerGlobalScope {
+  attribute EventHandler onsync;
+};
+
+[Exposed=ServiceWorker]
+interface SyncEvent : ExtendableEvent {
+  constructor(DOMString type, SyncEventInit init);
+  readonly attribute DOMString tag;
+  readonly attribute boolean lastChance;
+};
+
+dictionary SyncEventInit : ExtendableEventInit {
+  required DOMString tag;
+  boolean lastChance = false;
+};
diff --git a/test/wpt/tests/interfaces/badging.idl b/test/wpt/tests/interfaces/badging.idl
new file mode 100644
index 00000000000..f34dfa7e04a
--- /dev/null
+++ b/test/wpt/tests/interfaces/badging.idl
@@ -0,0 +1,19 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Badging API (https://w3c.github.io/badging/)
+
+[SecureContext]
+partial interface Navigator {
+  Promise<undefined> setClientBadge(optional [EnforceRange] unsigned long long contents);
+  Promise<undefined> clearClientBadge();
+};
+
+[SecureContext]
+interface mixin NavigatorBadge {
+  Promise<undefined> setAppBadge(optional [EnforceRange] unsigned long long contents);
+  Promise<undefined> clearAppBadge();
+};
+
+Navigator includes NavigatorBadge;
+WorkerNavigator includes NavigatorBadge;
diff --git a/test/wpt/tests/interfaces/battery-status.idl b/test/wpt/tests/interfaces/battery-status.idl
new file mode 100644
index 00000000000..2d042db28a6
--- /dev/null
+++ b/test/wpt/tests/interfaces/battery-status.idl
@@ -0,0 +1,21 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Battery Status API (https://w3c.github.io/battery/)
+
+[SecureContext]
+partial interface Navigator {
+  Promise<BatteryManager> getBattery();
+};
+
+[SecureContext, Exposed=Window]
+interface BatteryManager : EventTarget {
+    readonly        attribute boolean             charging;
+    readonly        attribute unrestricted double chargingTime;
+    readonly        attribute unrestricted double dischargingTime;
+    readonly        attribute double              level;
+                    attribute EventHandler        onchargingchange;
+                    attribute EventHandler        onchargingtimechange;
+                    attribute EventHandler        ondischargingtimechange;
+                    attribute EventHandler        onlevelchange;
+};
diff --git a/test/wpt/tests/interfaces/beacon.idl b/test/wpt/tests/interfaces/beacon.idl
new file mode 100644
index 00000000000..103a999fd43
--- /dev/null
+++ b/test/wpt/tests/interfaces/beacon.idl
@@ -0,0 +1,8 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Beacon (https://w3c.github.io/beacon/)
+
+partial interface Navigator {
+    boolean sendBeacon(USVString url, optional BodyInit? data = null);
+};
diff --git a/test/wpt/tests/interfaces/capture-handle-identity.idl b/test/wpt/tests/interfaces/capture-handle-identity.idl
new file mode 100644
index 00000000000..37b2c61dac9
--- /dev/null
+++ b/test/wpt/tests/interfaces/capture-handle-identity.idl
@@ -0,0 +1,27 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Capture Handle - Bootstrapping Collaboration when Screensharing (https://w3c.github.io/mediacapture-handle/identity/)
+
+dictionary CaptureHandleConfig {
+  boolean exposeOrigin = false;
+  DOMString handle = "";
+  sequence<DOMString> permittedOrigins = [];
+};
+
+partial interface MediaDevices {
+  undefined setCaptureHandleConfig(optional CaptureHandleConfig config = {});
+};
+
+dictionary CaptureHandle {
+  DOMString origin;
+  DOMString handle;
+};
+
+partial interface MediaStreamTrack {
+  CaptureHandle? getCaptureHandle();
+};
+
+partial interface MediaStreamTrack {
+  attribute EventHandler oncapturehandlechange;
+};
diff --git a/test/wpt/tests/interfaces/clipboard-apis.idl b/test/wpt/tests/interfaces/clipboard-apis.idl
new file mode 100644
index 00000000000..3f2c9ba6f28
--- /dev/null
+++ b/test/wpt/tests/interfaces/clipboard-apis.idl
@@ -0,0 +1,51 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Clipboard API and events (https://w3c.github.io/clipboard-apis/)
+
+dictionary ClipboardEventInit : EventInit {
+  DataTransfer? clipboardData = null;
+};
+
+[Exposed=Window]
+interface ClipboardEvent : Event {
+  constructor(DOMString type, optional ClipboardEventInit eventInitDict = {});
+  readonly attribute DataTransfer? clipboardData;
+};
+
+partial interface Navigator {
+  [SecureContext, SameObject] readonly attribute Clipboard clipboard;
+};
+
+typedef Promise<(DOMString or Blob)> ClipboardItemData;
+
+[SecureContext, Exposed=Window]
+interface ClipboardItem {
+  constructor(record<DOMString, ClipboardItemData> items,
+              optional ClipboardItemOptions options = {});
+
+  readonly attribute PresentationStyle presentationStyle;
+  readonly attribute FrozenArray<DOMString> types;
+
+  Promise<Blob> getType(DOMString type);
+};
+
+enum PresentationStyle { "unspecified", "inline", "attachment" };
+
+dictionary ClipboardItemOptions {
+  PresentationStyle presentationStyle = "unspecified";
+};
+
+typedef sequence<ClipboardItem> ClipboardItems;
+
+[SecureContext, Exposed=Window]
+interface Clipboard : EventTarget {
+  Promise<ClipboardItems> read();
+  Promise<DOMString> readText();
+  Promise<undefined> write(ClipboardItems data);
+  Promise<undefined> writeText(DOMString data);
+};
+
+dictionary ClipboardPermissionDescriptor : PermissionDescriptor {
+  boolean allowWithoutGesture = false;
+};
diff --git a/test/wpt/tests/interfaces/close-watcher.idl b/test/wpt/tests/interfaces/close-watcher.idl
new file mode 100644
index 00000000000..de7940c07e7
--- /dev/null
+++ b/test/wpt/tests/interfaces/close-watcher.idl
@@ -0,0 +1,19 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Close Watcher API (https://wicg.github.io/close-watcher/)
+
+[Exposed=Window]
+interface CloseWatcher : EventTarget {
+  constructor(optional CloseWatcherOptions options = {});
+
+  undefined destroy();
+  undefined close();
+
+  attribute EventHandler oncancel;
+  attribute EventHandler onclose;
+};
+
+dictionary CloseWatcherOptions {
+  AbortSignal signal;
+};
diff --git a/test/wpt/tests/interfaces/compat.idl b/test/wpt/tests/interfaces/compat.idl
new file mode 100644
index 00000000000..8106c2d4e05
--- /dev/null
+++ b/test/wpt/tests/interfaces/compat.idl
@@ -0,0 +1,13 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Compatibility Standard (https://compat.spec.whatwg.org/)
+
+partial interface Window {
+    readonly attribute short orientation;
+    attribute EventHandler onorientationchange;
+};
+
+partial interface HTMLBodyElement {
+    attribute EventHandler onorientationchange;
+};
diff --git a/test/wpt/tests/interfaces/compression.idl b/test/wpt/tests/interfaces/compression.idl
new file mode 100644
index 00000000000..88be302a4a6
--- /dev/null
+++ b/test/wpt/tests/interfaces/compression.idl
@@ -0,0 +1,16 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Compression Streams (https://wicg.github.io/compression/)
+
+[Exposed=*]
+interface CompressionStream {
+  constructor(DOMString format);
+};
+CompressionStream includes GenericTransformStream;
+
+[Exposed=*]
+interface DecompressionStream {
+  constructor(DOMString format);
+};
+DecompressionStream includes GenericTransformStream;
diff --git a/test/wpt/tests/interfaces/compute-pressure.idl b/test/wpt/tests/interfaces/compute-pressure.idl
new file mode 100644
index 00000000000..42ff4f207ab
--- /dev/null
+++ b/test/wpt/tests/interfaces/compute-pressure.idl
@@ -0,0 +1,40 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Compute Pressure Level 1 (https://w3c.github.io/compute-pressure/)
+
+enum PressureState { "nominal", "fair", "serious", "critical" };
+
+enum PressureFactor { "thermal", "power-supply" };
+
+callback PressureUpdateCallback = undefined (
+  sequence<PressureRecord> changes,
+  PressureObserver observer
+);
+
+enum PressureSource { "cpu" };
+
+[Exposed=(DedicatedWorker,SharedWorker,Window), SecureContext]
+interface PressureObserver {
+  constructor(PressureUpdateCallback callback, optional PressureObserverOptions options = {});
+
+  Promise<undefined> observe(PressureSource source);
+  undefined unobserve(PressureSource source);
+  undefined disconnect();
+  sequence<PressureRecord> takeRecords();
+
+  [SameObject] static readonly attribute FrozenArray<PressureSource> supportedSources;
+};
+
+[Exposed=(DedicatedWorker,SharedWorker,Window), SecureContext]
+interface PressureRecord {
+  readonly attribute PressureSource source;
+  readonly attribute PressureState state;
+  readonly attribute FrozenArray<PressureFactor> factors;
+  readonly attribute DOMHighResTimeStamp time;
+  [Default] object toJSON();
+};
+
+dictionary PressureObserverOptions {
+  double sampleRate = 1.0;
+};
diff --git a/test/wpt/tests/interfaces/console.idl b/test/wpt/tests/interfaces/console.idl
new file mode 100644
index 00000000000..fdf1d0df978
--- /dev/null
+++ b/test/wpt/tests/interfaces/console.idl
@@ -0,0 +1,34 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Console Standard (https://console.spec.whatwg.org/)
+
+[Exposed=*]
+namespace console { // but see namespace object requirements below
+  // Logging
+  undefined assert(optional boolean condition = false, any... data);
+  undefined clear();
+  undefined debug(any... data);
+  undefined error(any... data);
+  undefined info(any... data);
+  undefined log(any... data);
+  undefined table(optional any tabularData, optional sequence<DOMString> properties);
+  undefined trace(any... data);
+  undefined warn(any... data);
+  undefined dir(optional any item, optional object? options);
+  undefined dirxml(any... data);
+
+  // Counting
+  undefined count(optional DOMString label = "default");
+  undefined countReset(optional DOMString label = "default");
+
+  // Grouping
+  undefined group(any... data);
+  undefined groupCollapsed(any... data);
+  undefined groupEnd();
+
+  // Timing
+  undefined time(optional DOMString label = "default");
+  undefined timeLog(optional DOMString label = "default", any... data);
+  undefined timeEnd(optional DOMString label = "default");
+};
diff --git a/test/wpt/tests/interfaces/contact-picker.idl b/test/wpt/tests/interfaces/contact-picker.idl
new file mode 100644
index 00000000000..aece81664e4
--- /dev/null
+++ b/test/wpt/tests/interfaces/contact-picker.idl
@@ -0,0 +1,44 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Contact Picker API (https://w3c.github.io/contact-picker/spec/)
+
+[Exposed=Window]
+partial interface Navigator {
+  [SecureContext, SameObject] readonly attribute ContactsManager contacts;
+};
+
+enum ContactProperty { "address", "email", "icon", "name", "tel" };
+
+[Exposed=Window]
+interface ContactAddress {
+  [Default] object toJSON();
+  readonly attribute DOMString city;
+  readonly attribute DOMString country;
+  readonly attribute DOMString dependentLocality;
+  readonly attribute DOMString organization;
+  readonly attribute DOMString phone;
+  readonly attribute DOMString postalCode;
+  readonly attribute DOMString recipient;
+  readonly attribute DOMString region;
+  readonly attribute DOMString sortingCode;
+  readonly attribute FrozenArray<DOMString> addressLine;
+};
+
+dictionary ContactInfo {
+    sequence<ContactAddress> address;
+    sequence<DOMString> email;
+    sequence<Blob> icon;
+    sequence<DOMString> name;
+    sequence<DOMString> tel;
+};
+
+dictionary ContactsSelectOptions {
+    boolean multiple = false;
+};
+
+[Exposed=Window,SecureContext]
+interface ContactsManager {
+    Promise<sequence<ContactProperty>> getProperties();
+    Promise<sequence<ContactInfo>> select(sequence<ContactProperty> properties, optional ContactsSelectOptions options = {});
+};
diff --git a/test/wpt/tests/interfaces/content-index.idl b/test/wpt/tests/interfaces/content-index.idl
new file mode 100644
index 00000000000..177c5b9f11d
--- /dev/null
+++ b/test/wpt/tests/interfaces/content-index.idl
@@ -0,0 +1,46 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Content Index (https://wicg.github.io/content-index/spec/)
+
+partial interface ServiceWorkerGlobalScope {
+  attribute EventHandler oncontentdelete;
+};
+
+partial interface ServiceWorkerRegistration {
+  [SameObject] readonly attribute ContentIndex index;
+};
+
+enum ContentCategory {
+  "",
+  "homepage",
+  "article",
+  "video",
+  "audio",
+};
+
+dictionary ContentDescription {
+  required DOMString id;
+  required DOMString title;
+  required DOMString description;
+  ContentCategory category = "";
+  sequence<ImageResource> icons = [];
+  required USVString url;
+};
+
+[Exposed=(Window,Worker)]
+interface ContentIndex {
+  Promise<undefined> add(ContentDescription description);
+  Promise<undefined> delete(DOMString id);
+  Promise<sequence<ContentDescription>> getAll();
+};
+
+dictionary ContentIndexEventInit : ExtendableEventInit {
+  required DOMString id;
+};
+
+[Exposed=ServiceWorker]
+interface ContentIndexEvent : ExtendableEvent {
+  constructor(DOMString type, ContentIndexEventInit init);
+  readonly attribute DOMString id;
+};
diff --git a/test/wpt/tests/interfaces/cookie-store.idl b/test/wpt/tests/interfaces/cookie-store.idl
new file mode 100644
index 00000000000..72ef3f8c824
--- /dev/null
+++ b/test/wpt/tests/interfaces/cookie-store.idl
@@ -0,0 +1,110 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Cookie Store API (https://wicg.github.io/cookie-store/)
+
+[Exposed=(ServiceWorker,Window),
+ SecureContext]
+interface CookieStore : EventTarget {
+  Promise<CookieListItem?> get(USVString name);
+  Promise<CookieListItem?> get(optional CookieStoreGetOptions options = {});
+
+  Promise<CookieList> getAll(USVString name);
+  Promise<CookieList> getAll(optional CookieStoreGetOptions options = {});
+
+  Promise<undefined> set(USVString name, USVString value);
+  Promise<undefined> set(CookieInit options);
+
+  Promise<undefined> delete(USVString name);
+  Promise<undefined> delete(CookieStoreDeleteOptions options);
+
+  [Exposed=Window]
+  attribute EventHandler onchange;
+};
+
+dictionary CookieStoreGetOptions {
+  USVString name;
+  USVString url;
+};
+
+enum CookieSameSite {
+  "strict",
+  "lax",
+  "none"
+};
+
+dictionary CookieInit {
+  required USVString name;
+  required USVString value;
+  EpochTimeStamp? expires = null;
+  USVString? domain = null;
+  USVString path = "/";
+  CookieSameSite sameSite = "strict";
+};
+
+dictionary CookieStoreDeleteOptions {
+  required USVString name;
+  USVString? domain = null;
+  USVString path = "/";
+};
+
+dictionary CookieListItem {
+  USVString name;
+  USVString value;
+  USVString? domain;
+  USVString path;
+  EpochTimeStamp? expires;
+  boolean secure;
+  CookieSameSite sameSite;
+};
+
+typedef sequence<CookieListItem> CookieList;
+
+[Exposed=(ServiceWorker,Window),
+ SecureContext]
+interface CookieStoreManager {
+  Promise<undefined> subscribe(sequence<CookieStoreGetOptions> subscriptions);
+  Promise<sequence<CookieStoreGetOptions>> getSubscriptions();
+  Promise<undefined> unsubscribe(sequence<CookieStoreGetOptions> subscriptions);
+};
+
+[Exposed=(ServiceWorker,Window)]
+partial interface ServiceWorkerRegistration {
+  [SameObject] readonly attribute CookieStoreManager cookies;
+};
+
+[Exposed=Window,
+ SecureContext]
+interface CookieChangeEvent : Event {
+  constructor(DOMString type, optional CookieChangeEventInit eventInitDict = {});
+  [SameObject] readonly attribute FrozenArray<CookieListItem> changed;
+  [SameObject] readonly attribute FrozenArray<CookieListItem> deleted;
+};
+
+dictionary CookieChangeEventInit : EventInit {
+  CookieList changed;
+  CookieList deleted;
+};
+
+[Exposed=ServiceWorker]
+interface ExtendableCookieChangeEvent : ExtendableEvent {
+  constructor(DOMString type, optional ExtendableCookieChangeEventInit eventInitDict = {});
+  [SameObject] readonly attribute FrozenArray<CookieListItem> changed;
+  [SameObject] readonly attribute FrozenArray<CookieListItem> deleted;
+};
+
+dictionary ExtendableCookieChangeEventInit : ExtendableEventInit {
+  CookieList changed;
+  CookieList deleted;
+};
+
+[SecureContext]
+partial interface Window {
+  [SameObject] readonly attribute CookieStore cookieStore;
+};
+
+partial interface ServiceWorkerGlobalScope {
+  [SameObject] readonly attribute CookieStore cookieStore;
+
+  attribute EventHandler oncookiechange;
+};
diff --git a/test/wpt/tests/interfaces/credential-management.idl b/test/wpt/tests/interfaces/credential-management.idl
new file mode 100644
index 00000000000..e9fab13f35f
--- /dev/null
+++ b/test/wpt/tests/interfaces/credential-management.idl
@@ -0,0 +1,105 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Credential Management Level 1 (https://w3c.github.io/webappsec-credential-management/)
+
+[Exposed=Window, SecureContext]
+interface Credential {
+  readonly attribute USVString id;
+  readonly attribute DOMString type;
+  static Promise<boolean> isConditionalMediationAvailable();
+};
+
+[SecureContext]
+interface mixin CredentialUserData {
+  readonly attribute USVString name;
+  readonly attribute USVString iconURL;
+};
+
+partial interface Navigator {
+  [SecureContext, SameObject] readonly attribute CredentialsContainer credentials;
+};
+
+[Exposed=Window, SecureContext]
+interface CredentialsContainer {
+  Promise<Credential?> get(optional CredentialRequestOptions options = {});
+  Promise<Credential> store(Credential credential);
+  Promise<Credential?> create(optional CredentialCreationOptions options = {});
+  Promise<undefined> preventSilentAccess();
+};
+
+dictionary CredentialData {
+  required USVString id;
+};
+
+dictionary CredentialRequestOptions {
+  CredentialMediationRequirement mediation = "optional";
+  AbortSignal signal;
+};
+
+enum CredentialMediationRequirement {
+  "silent",
+  "optional",
+  "conditional",
+  "required"
+};
+
+dictionary CredentialCreationOptions {
+  AbortSignal signal;
+};
+
+[Exposed=Window,
+ SecureContext]
+interface PasswordCredential : Credential {
+  constructor(HTMLFormElement form);
+  constructor(PasswordCredentialData data);
+  readonly attribute USVString password;
+};
+PasswordCredential includes CredentialUserData;
+
+partial dictionary CredentialRequestOptions {
+  boolean password = false;
+};
+
+dictionary PasswordCredentialData : CredentialData {
+  USVString name;
+  USVString iconURL;
+  required USVString origin;
+  required USVString password;
+};
+
+typedef (PasswordCredentialData or HTMLFormElement) PasswordCredentialInit;
+
+partial dictionary CredentialCreationOptions {
+  PasswordCredentialInit password;
+};
+
+[Exposed=Window,
+ SecureContext]
+interface FederatedCredential : Credential {
+  constructor(FederatedCredentialInit data);
+  readonly attribute USVString provider;
+  readonly attribute DOMString? protocol;
+};
+FederatedCredential includes CredentialUserData;
+
+dictionary FederatedCredentialRequestOptions {
+  sequence<USVString> providers;
+  sequence<DOMString> protocols;
+};
+
+partial dictionary CredentialRequestOptions {
+  FederatedCredentialRequestOptions federated;
+};
+
+dictionary FederatedCredentialInit : CredentialData {
+  USVString name;
+  USVString iconURL;
+  required USVString origin;
+  required USVString provider;
+  DOMString protocol;
+};
+
+partial dictionary CredentialCreationOptions {
+  FederatedCredentialInit federated;
+};
diff --git a/test/wpt/tests/interfaces/csp-embedded-enforcement.idl b/test/wpt/tests/interfaces/csp-embedded-enforcement.idl
new file mode 100644
index 00000000000..a980630bc18
--- /dev/null
+++ b/test/wpt/tests/interfaces/csp-embedded-enforcement.idl
@@ -0,0 +1,8 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Content Security Policy: Embedded Enforcement (https://w3c.github.io/webappsec-cspee/)
+
+partial interface HTMLIFrameElement {
+  [CEReactions] attribute DOMString csp;
+};
diff --git a/test/wpt/tests/interfaces/csp-next.idl b/test/wpt/tests/interfaces/csp-next.idl
new file mode 100644
index 00000000000..d94b36cf885
--- /dev/null
+++ b/test/wpt/tests/interfaces/csp-next.idl
@@ -0,0 +1,21 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Scripting Policy (https://wicg.github.io/csp-next/scripting-policy.html)
+
+enum ScriptingPolicyViolationType {
+  "externalScript",
+  "inlineScript",
+  "inlineEventHandler",
+  "eval"
+};
+
+[Exposed=(Window,Worker), SecureContext]
+interface ScriptingPolicyReportBody : ReportBody {
+  [Default] object toJSON();
+  readonly attribute DOMString     violationType;
+  readonly attribute USVString?    violationURL;
+  readonly attribute USVString?    violationSample;
+  readonly attribute unsigned long lineno;
+  readonly attribute unsigned long colno;
+};
diff --git a/test/wpt/tests/interfaces/css-animation-worklet.idl b/test/wpt/tests/interfaces/css-animation-worklet.idl
new file mode 100644
index 00000000000..82d34a3ea2a
--- /dev/null
+++ b/test/wpt/tests/interfaces/css-animation-worklet.idl
@@ -0,0 +1,37 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: CSS Animation Worklet API (https://drafts.css-houdini.org/css-animationworklet-1/)
+
+[Exposed=Window]
+partial namespace CSS {
+    [SameObject] readonly attribute Worklet animationWorklet;
+};
+
+[ Global=(Worklet,AnimationWorklet), Exposed=AnimationWorklet ]
+interface AnimationWorkletGlobalScope : WorkletGlobalScope {
+    undefined registerAnimator(DOMString name, AnimatorInstanceConstructor animatorCtor);
+};
+
+callback AnimatorInstanceConstructor = any (any options, optional any state);
+
+[ Exposed=AnimationWorklet ]
+interface WorkletAnimationEffect {
+    EffectTiming         getTiming();
+    ComputedEffectTiming getComputedTiming();
+    attribute double? localTime;
+};
+
+[Exposed=Window]
+interface WorkletAnimation : Animation {
+        constructor(DOMString animatorName,
+              optional (AnimationEffect or sequence<AnimationEffect>)? effects = null,
+              optional AnimationTimeline? timeline,
+              optional any options);
+        readonly attribute DOMString animatorName;
+};
+
+[Exposed=AnimationWorklet]
+interface WorkletGroupEffect {
+  sequence<WorkletAnimationEffect> getChildren();
+};
diff --git a/test/wpt/tests/interfaces/css-animations-2.idl b/test/wpt/tests/interfaces/css-animations-2.idl
new file mode 100644
index 00000000000..84f138e8abb
--- /dev/null
+++ b/test/wpt/tests/interfaces/css-animations-2.idl
@@ -0,0 +1,9 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: CSS Animations Level 2 (https://drafts.csswg.org/css-animations-2/)
+
+[Exposed=Window]
+interface CSSAnimation : Animation {
+  readonly attribute CSSOMString animationName;
+};
diff --git a/test/wpt/tests/interfaces/css-animations.idl b/test/wpt/tests/interfaces/css-animations.idl
new file mode 100644
index 00000000000..6620e0156dc
--- /dev/null
+++ b/test/wpt/tests/interfaces/css-animations.idl
@@ -0,0 +1,47 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: CSS Animations Level 1 (https://drafts.csswg.org/css-animations-1/)
+
+[Exposed=Window]
+interface AnimationEvent : Event {
+  constructor(CSSOMString type, optional AnimationEventInit animationEventInitDict = {});
+  readonly attribute CSSOMString animationName;
+  readonly attribute double elapsedTime;
+  readonly attribute CSSOMString pseudoElement;
+};
+dictionary AnimationEventInit : EventInit {
+  CSSOMString animationName = "";
+  double elapsedTime = 0.0;
+  CSSOMString pseudoElement = "";
+};
+
+partial interface CSSRule {
+    const unsigned short KEYFRAMES_RULE = 7;
+    const unsigned short KEYFRAME_RULE = 8;
+};
+
+[Exposed=Window]
+interface CSSKeyframeRule : CSSRule {
+  attribute CSSOMString keyText;
+  [SameObject, PutForwards=cssText] readonly attribute CSSStyleDeclaration style;
+};
+
+[Exposed=Window]
+interface CSSKeyframesRule : CSSRule {
+           attribute CSSOMString name;
+  readonly attribute CSSRuleList cssRules;
+  readonly attribute unsigned long length;
+
+  getter CSSKeyframeRule (unsigned long index);
+  undefined        appendRule(CSSOMString rule);
+  undefined        deleteRule(CSSOMString select);
+  CSSKeyframeRule? findRule(CSSOMString select);
+};
+
+partial interface mixin GlobalEventHandlers {
+  attribute EventHandler onanimationstart;
+  attribute EventHandler onanimationiteration;
+  attribute EventHandler onanimationend;
+  attribute EventHandler onanimationcancel;
+};
diff --git a/test/wpt/tests/interfaces/css-cascade.idl b/test/wpt/tests/interfaces/css-cascade.idl
new file mode 100644
index 00000000000..9011dc7fd9e
--- /dev/null
+++ b/test/wpt/tests/interfaces/css-cascade.idl
@@ -0,0 +1,18 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: CSS Cascading and Inheritance Level 5 (https://drafts.csswg.org/css-cascade-5/)
+
+partial interface CSSImportRule {
+  readonly attribute CSSOMString? layerName;
+};
+
+[Exposed=Window]
+interface CSSLayerBlockRule : CSSGroupingRule {
+  readonly attribute CSSOMString name;
+};
+
+[Exposed=Window]
+interface CSSLayerStatementRule : CSSRule {
+  readonly attribute FrozenArray<CSSOMString> nameList;
+};
diff --git a/test/wpt/tests/interfaces/css-color-5.idl b/test/wpt/tests/interfaces/css-color-5.idl
new file mode 100644
index 00000000000..6f5c6dfc096
--- /dev/null
+++ b/test/wpt/tests/interfaces/css-color-5.idl
@@ -0,0 +1,12 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: CSS Color Module Level 5 (https://drafts.csswg.org/css-color-5/)
+
+[Exposed=Window]
+interface CSSColorProfileRule : CSSRule {
+  readonly attribute CSSOMString name ;
+  readonly attribute CSSOMString src ;
+  readonly attribute CSSOMString renderingIntent ;
+  readonly attribute CSSOMString components ;
+};
diff --git a/test/wpt/tests/interfaces/css-conditional.idl b/test/wpt/tests/interfaces/css-conditional.idl
new file mode 100644
index 00000000000..d87f305fddf
--- /dev/null
+++ b/test/wpt/tests/interfaces/css-conditional.idl
@@ -0,0 +1,27 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: CSS Conditional Rules Module Level 3 (https://drafts.csswg.org/css-conditional-3/)
+
+partial interface CSSRule {
+    const unsigned short SUPPORTS_RULE = 12;
+};
+
+[Exposed=Window]
+interface CSSConditionRule : CSSGroupingRule {
+    readonly attribute CSSOMString conditionText;
+};
+
+[Exposed=Window]
+interface CSSMediaRule : CSSConditionRule {
+    [SameObject, PutForwards=mediaText] readonly attribute MediaList media;
+};
+
+[Exposed=Window]
+interface CSSSupportsRule : CSSConditionRule {
+};
+
+partial namespace CSS {
+  boolean supports(CSSOMString property, CSSOMString value);
+  boolean supports(CSSOMString conditionText);
+};
diff --git a/test/wpt/tests/interfaces/css-contain-3.idl b/test/wpt/tests/interfaces/css-contain-3.idl
new file mode 100644
index 00000000000..0ecf3804954
--- /dev/null
+++ b/test/wpt/tests/interfaces/css-contain-3.idl
@@ -0,0 +1,10 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: CSS Containment Module Level 3 (https://drafts.csswg.org/css-contain-3/)
+
+[Exposed=Window]
+interface CSSContainerRule : CSSConditionRule {
+    readonly attribute CSSOMString containerName;
+    readonly attribute CSSOMString containerQuery;
+};
diff --git a/test/wpt/tests/interfaces/css-contain.idl b/test/wpt/tests/interfaces/css-contain.idl
new file mode 100644
index 00000000000..6b29119617a
--- /dev/null
+++ b/test/wpt/tests/interfaces/css-contain.idl
@@ -0,0 +1,13 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: CSS Containment Module Level 2 (https://drafts.csswg.org/css-contain-2/)
+
+[Exposed=Window]
+interface ContentVisibilityAutoStateChangedEvent : Event {
+  constructor(DOMString type, optional ContentVisibilityAutoStateChangedEventInit eventInitDict = {});
+  readonly attribute boolean skipped;
+};
+dictionary ContentVisibilityAutoStateChangedEventInit : EventInit {
+  boolean skipped = false;
+};
diff --git a/test/wpt/tests/interfaces/css-counter-styles.idl b/test/wpt/tests/interfaces/css-counter-styles.idl
new file mode 100644
index 00000000000..f679e0fe558
--- /dev/null
+++ b/test/wpt/tests/interfaces/css-counter-styles.idl
@@ -0,0 +1,23 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: CSS Counter Styles Level 3 (https://drafts.csswg.org/css-counter-styles-3/)
+
+partial interface CSSRule {
+    const unsigned short COUNTER_STYLE_RULE = 11;
+};
+
+[Exposed=Window]
+interface CSSCounterStyleRule : CSSRule {
+  attribute CSSOMString name;
+  attribute CSSOMString system;
+  attribute CSSOMString symbols;
+  attribute CSSOMString additiveSymbols;
+  attribute CSSOMString negative;
+  attribute CSSOMString prefix;
+  attribute CSSOMString suffix;
+  attribute CSSOMString range;
+  attribute CSSOMString pad;
+  attribute CSSOMString speakAs;
+  attribute CSSOMString fallback;
+};
diff --git a/test/wpt/tests/interfaces/css-font-loading.idl b/test/wpt/tests/interfaces/css-font-loading.idl
new file mode 100644
index 00000000000..6f2e16dd641
--- /dev/null
+++ b/test/wpt/tests/interfaces/css-font-loading.idl
@@ -0,0 +1,134 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: CSS Font Loading Module Level 3 (https://drafts.csswg.org/css-font-loading-3/)
+
+typedef (ArrayBuffer or ArrayBufferView) BinaryData;
+
+dictionary FontFaceDescriptors {
+  CSSOMString style = "normal";
+  CSSOMString weight = "normal";
+  CSSOMString stretch = "normal";
+  CSSOMString unicodeRange = "U+0-10FFFF";
+  CSSOMString variant = "normal";
+  CSSOMString featureSettings = "normal";
+  CSSOMString variationSettings = "normal";
+  CSSOMString display = "auto";
+  CSSOMString ascentOverride = "normal";
+  CSSOMString descentOverride = "normal";
+  CSSOMString lineGapOverride = "normal";
+};
+
+enum FontFaceLoadStatus { "unloaded", "loading", "loaded", "error" };
+
+[Exposed=(Window,Worker)]
+interface FontFace {
+  constructor(CSSOMString family, (CSSOMString or BinaryData) source,
+                optional FontFaceDescriptors descriptors = {});
+  attribute CSSOMString family;
+  attribute CSSOMString style;
+  attribute CSSOMString weight;
+  attribute CSSOMString stretch;
+  attribute CSSOMString unicodeRange;
+  attribute CSSOMString variant;
+  attribute CSSOMString featureSettings;
+  attribute CSSOMString variationSettings;
+  attribute CSSOMString display;
+  attribute CSSOMString ascentOverride;
+  attribute CSSOMString descentOverride;
+  attribute CSSOMString lineGapOverride;
+
+  readonly attribute FontFaceLoadStatus status;
+
+  Promise<FontFace> load();
+  readonly attribute Promise<FontFace> loaded;
+};
+
+[Exposed=(Window,Worker)]
+interface FontFaceFeatures {
+  /* The CSSWG is still discussing what goes in here */
+};
+
+[Exposed=(Window,Worker)]
+interface FontFaceVariationAxis {
+  readonly attribute DOMString name;
+  readonly attribute DOMString axisTag;
+  readonly attribute double minimumValue;
+  readonly attribute double maximumValue;
+  readonly attribute double defaultValue;
+};
+
+[Exposed=(Window,Worker)]
+interface FontFaceVariations {
+  readonly setlike<FontFaceVariationAxis>;
+};
+
+[Exposed=(Window,Worker)]
+interface FontFacePalette {
+  iterable<DOMString>;
+  readonly attribute unsigned long length;
+  getter DOMString (unsigned long index);
+  readonly attribute boolean usableWithLightBackground;
+  readonly attribute boolean usableWithDarkBackground;
+};
+
+[Exposed=(Window,Worker)]
+interface FontFacePalettes {
+  iterable<FontFacePalette>;
+  readonly attribute unsigned long length;
+  getter FontFacePalette (unsigned long index);
+};
+
+partial interface FontFace {
+  readonly attribute FontFaceFeatures features;
+  readonly attribute FontFaceVariations variations;
+  readonly attribute FontFacePalettes palettes;
+};
+
+dictionary FontFaceSetLoadEventInit : EventInit {
+  sequence<FontFace> fontfaces = [];
+};
+
+[Exposed=(Window,Worker)]
+interface FontFaceSetLoadEvent : Event {
+  constructor(CSSOMString type, optional FontFaceSetLoadEventInit eventInitDict = {});
+  [SameObject] readonly attribute FrozenArray<FontFace> fontfaces;
+};
+
+enum FontFaceSetLoadStatus { "loading", "loaded" };
+
+[Exposed=(Window,Worker)]
+interface FontFaceSet : EventTarget {
+  constructor(sequence<FontFace> initialFaces);
+
+  setlike<FontFace>;
+  FontFaceSet add(FontFace font);
+  boolean delete(FontFace font);
+  undefined clear();
+
+  // events for when loading state changes
+  attribute EventHandler onloading;
+  attribute EventHandler onloadingdone;
+  attribute EventHandler onloadingerror;
+
+  // check and start loads if appropriate
+  // and fulfill promise when all loads complete
+  Promise<sequence<FontFace>> load(CSSOMString font, optional CSSOMString text = " ");
+
+  // return whether all fonts in the fontlist are loaded
+  // (does not initiate load if not available)
+  boolean check(CSSOMString font, optional CSSOMString text = " ");
+
+  // async notification that font loading and layout operations are done
+  readonly attribute Promise<FontFaceSet> ready;
+
+  // loading state, "loading" while one or more fonts loading, "loaded" otherwise
+  readonly attribute FontFaceSetLoadStatus status;
+};
+
+interface mixin FontFaceSource {
+  readonly attribute FontFaceSet fonts;
+};
+
+Document includes FontFaceSource;
+WorkerGlobalScope includes FontFaceSource;
diff --git a/test/wpt/tests/interfaces/css-fonts.idl b/test/wpt/tests/interfaces/css-fonts.idl
new file mode 100644
index 00000000000..eddfc025215
--- /dev/null
+++ b/test/wpt/tests/interfaces/css-fonts.idl
@@ -0,0 +1,36 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: CSS Fonts Module Level 4 (https://drafts.csswg.org/css-fonts-4/)
+
+[Exposed=Window]
+interface CSSFontFaceRule : CSSRule {
+    readonly attribute CSSStyleDeclaration style;
+};
+
+partial interface CSSRule {  const unsigned short FONT_FEATURE_VALUES_RULE = 14;
+};
+[Exposed=Window]
+interface CSSFontFeatureValuesRule : CSSRule {
+  attribute CSSOMString fontFamily;
+  readonly attribute CSSFontFeatureValuesMap annotation;
+  readonly attribute CSSFontFeatureValuesMap ornaments;
+  readonly attribute CSSFontFeatureValuesMap stylistic;
+  readonly attribute CSSFontFeatureValuesMap swash;
+  readonly attribute CSSFontFeatureValuesMap characterVariant;
+  readonly attribute CSSFontFeatureValuesMap styleset;
+};
+
+[Exposed=Window]
+interface CSSFontFeatureValuesMap {
+  maplike<CSSOMString, sequence<unsigned long>>;
+  undefined set(CSSOMString featureValueName,
+           (unsigned long or sequence<unsigned long>) values);
+};
+
+[Exposed=Window]interface CSSFontPaletteValuesRule : CSSRule {
+  readonly attribute CSSOMString name;
+  readonly attribute CSSOMString fontFamily;
+  readonly attribute CSSOMString basePalette;
+  readonly attribute CSSOMString overrideColors;
+};
diff --git a/test/wpt/tests/interfaces/css-highlight-api.idl b/test/wpt/tests/interfaces/css-highlight-api.idl
new file mode 100644
index 00000000000..f3c6b2e9d21
--- /dev/null
+++ b/test/wpt/tests/interfaces/css-highlight-api.idl
@@ -0,0 +1,27 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: CSS Custom Highlight API Module Level 1 (https://drafts.csswg.org/css-highlight-api-1/)
+
+enum HighlightType {
+  "highlight",
+  "spelling-error",
+  "grammar-error"
+};
+
+[Exposed=Window]
+interface Highlight {
+  constructor(AbstractRange... initialRanges);
+  setlike<AbstractRange>;
+  attribute long priority;
+  attribute HighlightType type;
+};
+
+partial namespace CSS {
+  readonly attribute HighlightRegistry highlights;
+};
+
+[Exposed=Window]
+interface HighlightRegistry {
+  maplike<DOMString, Highlight>;
+};
diff --git a/test/wpt/tests/interfaces/css-images-4.idl b/test/wpt/tests/interfaces/css-images-4.idl
new file mode 100644
index 00000000000..8866b008ccb
--- /dev/null
+++ b/test/wpt/tests/interfaces/css-images-4.idl
@@ -0,0 +1,8 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: CSS Images Module Level 4 (https://drafts.csswg.org/css-images-4/)
+
+partial namespace CSS {
+  [SameObject] readonly attribute any elementSources;
+};
diff --git a/test/wpt/tests/interfaces/css-layout-api.idl b/test/wpt/tests/interfaces/css-layout-api.idl
new file mode 100644
index 00000000000..2b772d5b84a
--- /dev/null
+++ b/test/wpt/tests/interfaces/css-layout-api.idl
@@ -0,0 +1,144 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: CSS Layout API Level 1 (https://drafts.css-houdini.org/css-layout-api-1/)
+
+partial namespace CSS {
+    [SameObject] readonly attribute Worklet layoutWorklet;
+};
+
+[Global=(Worklet,LayoutWorklet),Exposed=LayoutWorklet]
+interface LayoutWorkletGlobalScope : WorkletGlobalScope {
+    undefined registerLayout(DOMString name, VoidFunction layoutCtor);
+};
+
+dictionary LayoutOptions {
+  ChildDisplayType childDisplay = "block";
+  LayoutSizingMode sizing = "block-like";
+};
+
+enum ChildDisplayType {
+    "block", // default - "blockifies" the child boxes.
+    "normal",
+};
+
+enum LayoutSizingMode {
+    "block-like", // default - Sizing behaves like block containers.
+    "manual", // Sizing is specified by the web developer.
+};
+
+[Exposed=LayoutWorklet]
+interface LayoutChild {
+    readonly attribute StylePropertyMapReadOnly styleMap;
+
+    Promise<IntrinsicSizes> intrinsicSizes();
+    Promise<LayoutFragment> layoutNextFragment(LayoutConstraintsOptions constraints, ChildBreakToken breakToken);
+};
+
+[Exposed=LayoutWorklet]
+interface LayoutFragment {
+    readonly attribute double inlineSize;
+    readonly attribute double blockSize;
+
+    attribute double inlineOffset;
+    attribute double blockOffset;
+
+    readonly attribute any data;
+
+    readonly attribute ChildBreakToken? breakToken;
+};
+
+[Exposed=LayoutWorklet]
+interface IntrinsicSizes {
+  readonly attribute double minContentSize;
+  readonly attribute double maxContentSize;
+};
+
+[Exposed=LayoutWorklet]
+interface LayoutConstraints {
+    readonly attribute double availableInlineSize;
+    readonly attribute double availableBlockSize;
+
+    readonly attribute double? fixedInlineSize;
+    readonly attribute double? fixedBlockSize;
+
+    readonly attribute double percentageInlineSize;
+    readonly attribute double percentageBlockSize;
+
+    readonly attribute double? blockFragmentationOffset;
+    readonly attribute BlockFragmentationType blockFragmentationType;
+
+    readonly attribute any data;
+};
+
+enum BlockFragmentationType { "none", "page", "column", "region" };
+
+dictionary LayoutConstraintsOptions {
+    double availableInlineSize;
+    double availableBlockSize;
+
+    double fixedInlineSize;
+    double fixedBlockSize;
+
+    double percentageInlineSize;
+    double percentageBlockSize;
+
+    double blockFragmentationOffset;
+    BlockFragmentationType blockFragmentationType = "none";
+
+    any data;
+};
+
+[Exposed=LayoutWorklet]
+interface ChildBreakToken {
+    readonly attribute BreakType breakType;
+    readonly attribute LayoutChild child;
+};
+
+[Exposed=LayoutWorklet]
+interface BreakToken {
+    readonly attribute FrozenArray<ChildBreakToken> childBreakTokens;
+    readonly attribute any data;
+};
+
+dictionary BreakTokenOptions {
+    sequence<ChildBreakToken> childBreakTokens;
+    any data = null;
+};
+
+enum BreakType { "none", "line", "column", "page", "region" };
+
+[Exposed=LayoutWorklet]
+interface LayoutEdges {
+  readonly attribute double inlineStart;
+  readonly attribute double inlineEnd;
+
+  readonly attribute double blockStart;
+  readonly attribute double blockEnd;
+
+  // Convenience attributes for the sum in one direction.
+  readonly attribute double inline;
+  readonly attribute double block;
+};
+
+// This is the final return value from the author defined layout() method.
+dictionary FragmentResultOptions {
+    double inlineSize = 0;
+    double blockSize = 0;
+    double autoBlockSize = 0;
+    sequence<LayoutFragment> childFragments = [];
+    any data = null;
+    BreakTokenOptions breakToken = null;
+};
+
+[Exposed=LayoutWorklet]
+interface FragmentResult {
+    constructor(optional FragmentResultOptions options = {});
+    readonly attribute double inlineSize;
+    readonly attribute double blockSize;
+};
+
+dictionary IntrinsicSizesResultOptions {
+    double maxContentSize;
+    double minContentSize;
+};
diff --git a/test/wpt/tests/interfaces/css-masking.idl b/test/wpt/tests/interfaces/css-masking.idl
new file mode 100644
index 00000000000..72fbd9aa1ff
--- /dev/null
+++ b/test/wpt/tests/interfaces/css-masking.idl
@@ -0,0 +1,20 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: CSS Masking Module Level 1 (https://drafts.fxtf.org/css-masking-1/)
+
+[Exposed=Window]
+interface SVGClipPathElement : SVGElement {
+  readonly attribute SVGAnimatedEnumeration clipPathUnits;
+  readonly attribute SVGAnimatedTransformList transform;
+};
+
+[Exposed=Window]
+interface SVGMaskElement : SVGElement {
+  readonly attribute SVGAnimatedEnumeration maskUnits;
+  readonly attribute SVGAnimatedEnumeration maskContentUnits;
+  readonly attribute SVGAnimatedLength x;
+  readonly attribute SVGAnimatedLength y;
+  readonly attribute SVGAnimatedLength width;
+  readonly attribute SVGAnimatedLength height;
+};
diff --git a/test/wpt/tests/interfaces/css-nav.idl b/test/wpt/tests/interfaces/css-nav.idl
new file mode 100644
index 00000000000..03f039e4cb5
--- /dev/null
+++ b/test/wpt/tests/interfaces/css-nav.idl
@@ -0,0 +1,48 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: CSS Spatial Navigation Level 1 (https://drafts.csswg.org/css-nav-1/)
+
+enum SpatialNavigationDirection {
+    "up",
+    "down",
+    "left",
+    "right",
+};
+
+partial interface Window {
+    undefined navigate(SpatialNavigationDirection dir);
+};
+
+enum FocusableAreaSearchMode {
+    "visible",
+    "all"
+};
+
+dictionary FocusableAreasOption {
+    FocusableAreaSearchMode mode;
+};
+
+dictionary SpatialNavigationSearchOptions {
+    sequence<Node>? candidates;
+    Node? container;
+};
+
+partial interface Element {
+    Node getSpatialNavigationContainer();
+    sequence<Node> focusableAreas(optional FocusableAreasOption option = {});
+    Node? spatialNavigationSearch(SpatialNavigationDirection dir, optional SpatialNavigationSearchOptions options = {});
+};
+
+[Exposed=Window]
+interface NavigationEvent : UIEvent {
+    constructor(DOMString type,
+                optional NavigationEventInit eventInitDict = {});
+    readonly attribute SpatialNavigationDirection dir;
+    readonly attribute EventTarget? relatedTarget;
+};
+
+dictionary NavigationEventInit : UIEventInit {
+    SpatialNavigationDirection dir;
+    EventTarget? relatedTarget = null;
+};
diff --git a/test/wpt/tests/interfaces/css-nesting.idl b/test/wpt/tests/interfaces/css-nesting.idl
new file mode 100644
index 00000000000..01f27ab9d65
--- /dev/null
+++ b/test/wpt/tests/interfaces/css-nesting.idl
@@ -0,0 +1,10 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: CSS Nesting Module (https://drafts.csswg.org/css-nesting-1/)
+
+partial interface CSSStyleRule {
+  [SameObject] readonly attribute CSSRuleList cssRules;
+  unsigned long insertRule(CSSOMString rule, optional unsigned long index = 0);
+  undefined deleteRule(unsigned long index);
+};
diff --git a/test/wpt/tests/interfaces/css-paint-api.idl b/test/wpt/tests/interfaces/css-paint-api.idl
new file mode 100644
index 00000000000..0924c535566
--- /dev/null
+++ b/test/wpt/tests/interfaces/css-paint-api.idl
@@ -0,0 +1,39 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: CSS Painting API Level 1 (https://drafts.css-houdini.org/css-paint-api-1/)
+
+partial namespace CSS {
+    [SameObject] readonly attribute Worklet paintWorklet;
+};
+
+[Global=(Worklet,PaintWorklet),Exposed=PaintWorklet]
+interface PaintWorkletGlobalScope : WorkletGlobalScope {
+    undefined registerPaint(DOMString name, VoidFunction paintCtor);
+    readonly attribute unrestricted double devicePixelRatio;
+};
+
+dictionary PaintRenderingContext2DSettings {
+    boolean alpha = true;
+};
+
+[Exposed=PaintWorklet]
+interface PaintRenderingContext2D {
+};
+PaintRenderingContext2D includes CanvasState;
+PaintRenderingContext2D includes CanvasTransform;
+PaintRenderingContext2D includes CanvasCompositing;
+PaintRenderingContext2D includes CanvasImageSmoothing;
+PaintRenderingContext2D includes CanvasFillStrokeStyles;
+PaintRenderingContext2D includes CanvasShadowStyles;
+PaintRenderingContext2D includes CanvasRect;
+PaintRenderingContext2D includes CanvasDrawPath;
+PaintRenderingContext2D includes CanvasDrawImage;
+PaintRenderingContext2D includes CanvasPathDrawingStyles;
+PaintRenderingContext2D includes CanvasPath;
+
+[Exposed=PaintWorklet]
+interface PaintSize {
+    readonly attribute double width;
+    readonly attribute double height;
+};
diff --git a/test/wpt/tests/interfaces/css-parser-api.idl b/test/wpt/tests/interfaces/css-parser-api.idl
new file mode 100644
index 00000000000..4e34a3f25d7
--- /dev/null
+++ b/test/wpt/tests/interfaces/css-parser-api.idl
@@ -0,0 +1,76 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: CSS Parser API (https://wicg.github.io/css-parser-api/)
+
+typedef (DOMString or ReadableStream) CSSStringSource;
+typedef (DOMString or CSSStyleValue or CSSParserValue) CSSToken;
+
+partial namespace CSS {
+  Promise<sequence<CSSParserRule>> parseStylesheet(CSSStringSource css, optional CSSParserOptions options = {});
+  Promise<sequence<CSSParserRule>> parseRuleList(CSSStringSource css, optional CSSParserOptions options = {});
+  Promise<CSSParserRule> parseRule(CSSStringSource css, optional CSSParserOptions options = {});
+  Promise<sequence<CSSParserRule>> parseDeclarationList(CSSStringSource css, optional CSSParserOptions options = {});
+  CSSParserDeclaration parseDeclaration(DOMString css, optional CSSParserOptions options = {});
+  CSSToken parseValue(DOMString css);
+  sequence<CSSToken> parseValueList(DOMString css);
+  sequence<sequence<CSSToken>> parseCommaValueList(DOMString css);
+};
+
+dictionary CSSParserOptions {
+  object atRules;
+  /* dict of at-rule name => at-rule type
+     (contains decls or contains qualified rules) */
+};
+
+[Exposed=Window]
+interface CSSParserRule {
+  /* Just a superclass. */
+};
+
+[Exposed=Window]
+interface CSSParserAtRule : CSSParserRule {
+  constructor(DOMString name, sequence<CSSToken> prelude, optional sequence<CSSParserRule>? body);
+  readonly attribute DOMString name;
+  readonly attribute FrozenArray<CSSParserValue> prelude;
+  readonly attribute FrozenArray<CSSParserRule>? body;
+  /* nullable to handle at-statements */
+  stringifier;
+};
+
+[Exposed=Window]
+interface CSSParserQualifiedRule : CSSParserRule {
+  constructor(sequence<CSSToken> prelude, optional sequence<CSSParserRule>? body);
+  readonly attribute FrozenArray<CSSParserValue> prelude;
+  readonly attribute FrozenArray<CSSParserRule> body;
+  stringifier;
+};
+
+[Exposed=Window]
+interface CSSParserDeclaration : CSSParserRule {
+  constructor(DOMString name, optional sequence<CSSParserRule> body);
+  readonly attribute DOMString name;
+  readonly attribute FrozenArray<CSSParserValue> body;
+  stringifier;
+};
+
+[Exposed=Window]
+interface CSSParserValue {
+  /* Just a superclass. */
+};
+
+[Exposed=Window]
+interface CSSParserBlock : CSSParserValue {
+  constructor(DOMString name, sequence<CSSParserValue> body);
+  readonly attribute DOMString name; /* "[]", "{}", or "()" */
+  readonly attribute FrozenArray<CSSParserValue> body;
+  stringifier;
+};
+
+[Exposed=Window]
+interface CSSParserFunction : CSSParserValue {
+  constructor(DOMString name, sequence<sequence<CSSParserValue>> args);
+  readonly attribute DOMString name;
+  readonly attribute FrozenArray<FrozenArray<CSSParserValue>> args;
+  stringifier;
+};
diff --git a/test/wpt/tests/interfaces/css-properties-values-api.idl b/test/wpt/tests/interfaces/css-properties-values-api.idl
new file mode 100644
index 00000000000..eb7d7b027e7
--- /dev/null
+++ b/test/wpt/tests/interfaces/css-properties-values-api.idl
@@ -0,0 +1,23 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: CSS Properties and Values API Level 1 (https://drafts.css-houdini.org/css-properties-values-api-1/)
+
+dictionary PropertyDefinition {
+  required DOMString name;
+           DOMString syntax       = "*";
+  required boolean   inherits;
+           DOMString initialValue;
+};
+
+partial namespace CSS {
+  undefined registerProperty(PropertyDefinition definition);
+};
+
+[Exposed=Window]
+interface CSSPropertyRule : CSSRule {
+    readonly attribute CSSOMString name;
+    readonly attribute CSSOMString syntax;
+    readonly attribute boolean inherits;
+    readonly attribute CSSOMString? initialValue;
+};
diff --git a/test/wpt/tests/interfaces/css-pseudo.idl b/test/wpt/tests/interfaces/css-pseudo.idl
new file mode 100644
index 00000000000..dbe4c5461f6
--- /dev/null
+++ b/test/wpt/tests/interfaces/css-pseudo.idl
@@ -0,0 +1,16 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: CSS Pseudo-Elements Module Level 4 (https://drafts.csswg.org/css-pseudo-4/)
+
+[Exposed=Window]
+interface CSSPseudoElement : EventTarget {
+    readonly attribute CSSOMString type;
+    readonly attribute Element element;
+    readonly attribute (Element or CSSPseudoElement) parent;
+    CSSPseudoElement? pseudo(CSSOMString type);
+};
+
+partial interface Element {
+  CSSPseudoElement? pseudo(CSSOMString type);
+};
diff --git a/test/wpt/tests/interfaces/css-regions.idl b/test/wpt/tests/interfaces/css-regions.idl
new file mode 100644
index 00000000000..113438f790e
--- /dev/null
+++ b/test/wpt/tests/interfaces/css-regions.idl
@@ -0,0 +1,29 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: CSS Regions Module Level 1 (https://drafts.csswg.org/css-regions-1/)
+
+partial interface Document {
+  readonly attribute NamedFlowMap namedFlows;
+};
+
+[Exposed=Window] interface NamedFlowMap {
+  maplike<CSSOMString, NamedFlow>;
+};
+
+[Exposed=Window]
+interface NamedFlow : EventTarget {
+  readonly attribute CSSOMString name;
+  readonly attribute boolean overset;
+  sequence<Element> getRegions();
+  readonly attribute short firstEmptyRegionIndex;
+  sequence<Node> getContent();
+  sequence<Element> getRegionsByContent(Node node);
+};
+
+interface mixin Region {
+  readonly attribute CSSOMString regionOverset;
+  sequence<Range>? getRegionFlowRanges();
+};
+
+Element includes Region;
diff --git a/test/wpt/tests/interfaces/css-shadow-parts.idl b/test/wpt/tests/interfaces/css-shadow-parts.idl
new file mode 100644
index 00000000000..3759199fc14
--- /dev/null
+++ b/test/wpt/tests/interfaces/css-shadow-parts.idl
@@ -0,0 +1,8 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: CSS Shadow Parts (https://drafts.csswg.org/css-shadow-parts-1/)
+
+partial interface Element {
+  [SameObject, PutForwards=value] readonly attribute DOMTokenList part;
+};
diff --git a/test/wpt/tests/interfaces/css-toggle.tentative.idl b/test/wpt/tests/interfaces/css-toggle.tentative.idl
new file mode 100644
index 00000000000..5587019a290
--- /dev/null
+++ b/test/wpt/tests/interfaces/css-toggle.tentative.idl
@@ -0,0 +1,51 @@
+partial interface Element {
+  [SameObject] readonly attribute CSSToggleMap toggles;
+};
+
+interface CSSToggleMap {
+  maplike<DOMString, CSSToggle>;
+  CSSToggleMap set(DOMString key, CSSToggle value);
+};
+
+interface CSSToggle {
+  attribute (unsigned long or DOMString) value;
+  attribute unsigned long? valueAsNumber;
+  attribute DOMString? valueAsString;
+
+  attribute (unsigned long or FrozenArray<DOMString>) states;
+  attribute boolean group;
+  attribute CSSToggleScope scope;
+  attribute CSSToggleCycle cycle;
+
+  constructor(optional CSSToggleData options);
+};
+
+dictionary CSSToggleData {
+  (unsigned long or DOMString) value = 0;
+  (unsigned long or sequence<DOMString>) states = 1;
+  boolean group = false;
+  CSSToggleScope scope = "wide";
+  CSSToggleCycle cycle = "cycle";
+};
+
+enum CSSToggleScope {
+  "narrow",
+  "wide",
+};
+
+enum CSSToggleCycle {
+  "cycle",
+  "cycle-on",
+  "sticky",
+};
+
+interface CSSToggleEvent : Event {
+  constructor(DOMString type, optional CSSToggleEventInit eventInitDict = {});
+  readonly attribute DOMString toggleName;
+  readonly attribute CSSToggle? toggle;
+};
+
+dictionary CSSToggleEventInit : EventInit {
+  DOMString toggleName = "";
+  CSSToggle? toggle = null;
+};
diff --git a/test/wpt/tests/interfaces/css-transitions-2.idl b/test/wpt/tests/interfaces/css-transitions-2.idl
new file mode 100644
index 00000000000..9d06f3cf260
--- /dev/null
+++ b/test/wpt/tests/interfaces/css-transitions-2.idl
@@ -0,0 +1,9 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: CSS Transitions Level 2 (https://drafts.csswg.org/css-transitions-2/)
+
+[Exposed=Window]
+interface CSSTransition : Animation {
+  readonly attribute CSSOMString transitionProperty;
+};
diff --git a/test/wpt/tests/interfaces/css-transitions.idl b/test/wpt/tests/interfaces/css-transitions.idl
new file mode 100644
index 00000000000..0f00b2c014c
--- /dev/null
+++ b/test/wpt/tests/interfaces/css-transitions.idl
@@ -0,0 +1,25 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: CSS Transitions (https://drafts.csswg.org/css-transitions-1/)
+
+[Exposed=Window]
+interface TransitionEvent : Event {
+  constructor(CSSOMString type, optional TransitionEventInit transitionEventInitDict = {});
+  readonly attribute CSSOMString propertyName;
+  readonly attribute double elapsedTime;
+  readonly attribute CSSOMString pseudoElement;
+};
+
+dictionary TransitionEventInit : EventInit {
+  CSSOMString propertyName = "";
+  double elapsedTime = 0.0;
+  CSSOMString pseudoElement = "";
+};
+
+partial interface mixin GlobalEventHandlers {
+  attribute EventHandler ontransitionrun;
+  attribute EventHandler ontransitionstart;
+  attribute EventHandler ontransitionend;
+  attribute EventHandler ontransitioncancel;
+};
diff --git a/test/wpt/tests/interfaces/css-typed-om.idl b/test/wpt/tests/interfaces/css-typed-om.idl
new file mode 100644
index 00000000000..595a424e014
--- /dev/null
+++ b/test/wpt/tests/interfaces/css-typed-om.idl
@@ -0,0 +1,425 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: CSS Typed OM Level 1 (https://drafts.css-houdini.org/css-typed-om-1/)
+
+[Exposed=(Window, Worker, PaintWorklet, LayoutWorklet)]
+interface CSSStyleValue {
+    stringifier;
+    [Exposed=Window] static CSSStyleValue parse(USVString property, USVString cssText);
+    [Exposed=Window] static sequence<CSSStyleValue> parseAll(USVString property, USVString cssText);
+};
+
+[Exposed=(Window, Worker, PaintWorklet, LayoutWorklet)]
+interface StylePropertyMapReadOnly {
+    iterable<USVString, sequence<CSSStyleValue>>;
+    any get(USVString property);
+    /* 'any' means (undefined or CSSStyleValue) here,
+       see https://github.com/heycam/webidl/issues/60 */
+    sequence<CSSStyleValue> getAll(USVString property);
+    boolean has(USVString property);
+    readonly attribute unsigned long size;
+};
+
+[Exposed=Window]
+interface StylePropertyMap : StylePropertyMapReadOnly {
+    undefined set(USVString property, (CSSStyleValue or USVString)... values);
+    undefined append(USVString property, (CSSStyleValue or USVString)... values);
+    undefined delete(USVString property);
+    undefined clear();
+};
+
+partial interface Element {
+    [SameObject] StylePropertyMapReadOnly computedStyleMap();
+};
+
+partial interface CSSStyleRule {
+    [SameObject] readonly attribute StylePropertyMap styleMap;
+};
+
+partial interface mixin ElementCSSInlineStyle {
+    [SameObject] readonly attribute StylePropertyMap attributeStyleMap;
+};
+
+[Exposed=(Window, Worker, PaintWorklet, LayoutWorklet)]
+interface CSSUnparsedValue : CSSStyleValue {
+    constructor(sequence<CSSUnparsedSegment> members);
+    iterable<CSSUnparsedSegment>;
+    readonly attribute unsigned long length;
+    getter CSSUnparsedSegment (unsigned long index);
+    setter CSSUnparsedSegment (unsigned long index, CSSUnparsedSegment val);
+};
+
+typedef (USVString or CSSVariableReferenceValue) CSSUnparsedSegment;
+
+[Exposed=(Window, Worker, PaintWorklet, LayoutWorklet)]
+interface CSSVariableReferenceValue {
+    constructor(USVString variable, optional CSSUnparsedValue? fallback = null);
+    attribute USVString variable;
+    readonly attribute CSSUnparsedValue? fallback;
+};
+
+[Exposed=(Window, Worker, PaintWorklet, LayoutWorklet)]
+interface CSSKeywordValue : CSSStyleValue {
+    constructor(USVString value);
+    attribute USVString value;
+};
+
+typedef (DOMString or CSSKeywordValue) CSSKeywordish;
+
+typedef (double or CSSNumericValue) CSSNumberish;
+
+enum CSSNumericBaseType {
+    "length",
+    "angle",
+    "time",
+    "frequency",
+    "resolution",
+    "flex",
+    "percent",
+};
+
+dictionary CSSNumericType {
+    long length;
+    long angle;
+    long time;
+    long frequency;
+    long resolution;
+    long flex;
+    long percent;
+    CSSNumericBaseType percentHint;
+};
+
+[Exposed=(Window, Worker, PaintWorklet, LayoutWorklet)]
+interface CSSNumericValue : CSSStyleValue {
+    CSSNumericValue add(CSSNumberish... values);
+    CSSNumericValue sub(CSSNumberish... values);
+    CSSNumericValue mul(CSSNumberish... values);
+    CSSNumericValue div(CSSNumberish... values);
+    CSSNumericValue min(CSSNumberish... values);
+    CSSNumericValue max(CSSNumberish... values);
+
+    boolean equals(CSSNumberish... value);
+
+    CSSUnitValue to(USVString unit);
+    CSSMathSum toSum(USVString... units);
+    CSSNumericType type();
+
+    [Exposed=Window] static CSSNumericValue parse(USVString cssText);
+};
+
+[Exposed=(Window, Worker, PaintWorklet, LayoutWorklet)]
+interface CSSUnitValue : CSSNumericValue {
+    constructor(double value, USVString unit);
+    attribute double value;
+    readonly attribute USVString unit;
+};
+
+[Exposed=(Window, Worker, PaintWorklet, LayoutWorklet)]
+interface CSSMathValue : CSSNumericValue {
+    readonly attribute CSSMathOperator operator;
+};
+
+[Exposed=(Window, Worker, PaintWorklet, LayoutWorklet)]
+interface CSSMathSum : CSSMathValue {
+    constructor(CSSNumberish... args);
+    readonly attribute CSSNumericArray values;
+};
+
+[Exposed=(Window, Worker, PaintWorklet, LayoutWorklet)]
+interface CSSMathProduct : CSSMathValue {
+    constructor(CSSNumberish... args);
+    readonly attribute CSSNumericArray values;
+};
+
+[Exposed=(Window, Worker, PaintWorklet, LayoutWorklet)]
+interface CSSMathNegate : CSSMathValue {
+    constructor(CSSNumberish arg);
+    readonly attribute CSSNumericValue value;
+};
+
+[Exposed=(Window, Worker, PaintWorklet, LayoutWorklet)]
+interface CSSMathInvert : CSSMathValue {
+    constructor(CSSNumberish arg);
+    readonly attribute CSSNumericValue value;
+};
+
+[Exposed=(Window, Worker, PaintWorklet, LayoutWorklet)]
+interface CSSMathMin : CSSMathValue {
+    constructor(CSSNumberish... args);
+    readonly attribute CSSNumericArray values;
+};
+
+[Exposed=(Window, Worker, PaintWorklet, LayoutWorklet)]
+interface CSSMathMax : CSSMathValue {
+    constructor(CSSNumberish... args);
+    readonly attribute CSSNumericArray values;
+};
+
+[Exposed=(Window, Worker, PaintWorklet, LayoutWorklet)]
+interface CSSMathClamp : CSSMathValue {
+    constructor(CSSNumberish lower, CSSNumberish value, CSSNumberish upper);
+    readonly attribute CSSNumericValue lower;
+    readonly attribute CSSNumericValue value;
+    readonly attribute CSSNumericValue upper;
+};
+
+[Exposed=(Window, Worker, PaintWorklet, LayoutWorklet)]
+interface CSSNumericArray {
+    iterable<CSSNumericValue>;
+    readonly attribute unsigned long length;
+    getter CSSNumericValue (unsigned long index);
+};
+
+enum CSSMathOperator {
+    "sum",
+    "product",
+    "negate",
+    "invert",
+    "min",
+    "max",
+    "clamp",
+};
+
+partial namespace CSS {
+    CSSUnitValue number(double value);
+    CSSUnitValue percent(double value);
+
+    // <length>
+    CSSUnitValue em(double value);
+    CSSUnitValue ex(double value);
+    CSSUnitValue ch(double value);
+    CSSUnitValue ic(double value);
+    CSSUnitValue rem(double value);
+    CSSUnitValue lh(double value);
+    CSSUnitValue rlh(double value);
+    CSSUnitValue vw(double value);
+    CSSUnitValue vh(double value);
+    CSSUnitValue vi(double value);
+    CSSUnitValue vb(double value);
+    CSSUnitValue vmin(double value);
+    CSSUnitValue vmax(double value);
+    CSSUnitValue svw(double value);
+    CSSUnitValue svh(double value);
+    CSSUnitValue svi(double value);
+    CSSUnitValue svb(double value);
+    CSSUnitValue svmin(double value);
+    CSSUnitValue svmax(double value);
+    CSSUnitValue lvw(double value);
+    CSSUnitValue lvh(double value);
+    CSSUnitValue lvi(double value);
+    CSSUnitValue lvb(double value);
+    CSSUnitValue lvmin(double value);
+    CSSUnitValue lvmax(double value);
+    CSSUnitValue dvw(double value);
+    CSSUnitValue dvh(double value);
+    CSSUnitValue dvi(double value);
+    CSSUnitValue dvb(double value);
+    CSSUnitValue dvmin(double value);
+    CSSUnitValue dvmax(double value);
+    CSSUnitValue cqw(double value);
+    CSSUnitValue cqh(double value);
+    CSSUnitValue cqi(double value);
+    CSSUnitValue cqb(double value);
+    CSSUnitValue cqmin(double value);
+    CSSUnitValue cqmax(double value);
+    CSSUnitValue cm(double value);
+    CSSUnitValue mm(double value);
+    CSSUnitValue Q(double value);
+    CSSUnitValue in(double value);
+    CSSUnitValue pt(double value);
+    CSSUnitValue pc(double value);
+    CSSUnitValue px(double value);
+
+    // <angle>
+    CSSUnitValue deg(double value);
+    CSSUnitValue grad(double value);
+    CSSUnitValue rad(double value);
+    CSSUnitValue turn(double value);
+
+    // <time>
+    CSSUnitValue s(double value);
+    CSSUnitValue ms(double value);
+
+    // <frequency>
+    CSSUnitValue Hz(double value);
+    CSSUnitValue kHz(double value);
+
+    // <resolution>
+    CSSUnitValue dpi(double value);
+    CSSUnitValue dpcm(double value);
+    CSSUnitValue dppx(double value);
+
+    // <flex>
+    CSSUnitValue fr(double value);
+};
+
+[Exposed=(Window, Worker, PaintWorklet, LayoutWorklet)]
+interface CSSTransformValue : CSSStyleValue {
+    constructor(sequence<CSSTransformComponent> transforms);
+    iterable<CSSTransformComponent>;
+    readonly attribute unsigned long length;
+    getter CSSTransformComponent (unsigned long index);
+    setter CSSTransformComponent (unsigned long index, CSSTransformComponent val);
+
+    readonly attribute boolean is2D;
+    DOMMatrix toMatrix();
+};
+
+typedef (CSSNumericValue or CSSKeywordish) CSSPerspectiveValue;
+
+[Exposed=(Window, Worker, PaintWorklet, LayoutWorklet)]
+interface CSSTransformComponent {
+    stringifier;
+    attribute boolean is2D;
+    DOMMatrix toMatrix();
+};
+
+[Exposed=(Window, Worker, PaintWorklet, LayoutWorklet)]
+interface CSSTranslate : CSSTransformComponent {
+    constructor(CSSNumericValue x, CSSNumericValue y, optional CSSNumericValue z);
+    attribute CSSNumericValue x;
+    attribute CSSNumericValue y;
+    attribute CSSNumericValue z;
+};
+
+[Exposed=(Window, Worker, PaintWorklet, LayoutWorklet)]
+interface CSSRotate : CSSTransformComponent {
+    constructor(CSSNumericValue angle);
+    constructor(CSSNumberish x, CSSNumberish y, CSSNumberish z, CSSNumericValue angle);
+    attribute CSSNumberish x;
+    attribute CSSNumberish y;
+    attribute CSSNumberish z;
+    attribute CSSNumericValue angle;
+};
+
+[Exposed=(Window, Worker, PaintWorklet, LayoutWorklet)]
+interface CSSScale : CSSTransformComponent {
+    constructor(CSSNumberish x, CSSNumberish y, optional CSSNumberish z);
+    attribute CSSNumberish x;
+    attribute CSSNumberish y;
+    attribute CSSNumberish z;
+};
+
+[Exposed=(Window, Worker, PaintWorklet, LayoutWorklet)]
+interface CSSSkew : CSSTransformComponent {
+    constructor(CSSNumericValue ax, CSSNumericValue ay);
+    attribute CSSNumericValue ax;
+    attribute CSSNumericValue ay;
+};
+
+[Exposed=(Window, Worker, PaintWorklet, LayoutWorklet)]
+interface CSSSkewX : CSSTransformComponent {
+    constructor(CSSNumericValue ax);
+    attribute CSSNumericValue ax;
+};
+
+[Exposed=(Window, Worker, PaintWorklet, LayoutWorklet)]
+interface CSSSkewY : CSSTransformComponent {
+    constructor(CSSNumericValue ay);
+    attribute CSSNumericValue ay;
+};
+
+/* Note that skew(x,y) is *not* the same as skewX(x) skewY(y),
+   thus the separate interfaces for all three. */
+
+[Exposed=(Window, Worker, PaintWorklet, LayoutWorklet)]
+interface CSSPerspective : CSSTransformComponent {
+    constructor(CSSPerspectiveValue length);
+    attribute CSSPerspectiveValue length;
+};
+
+[Exposed=(Window, Worker, PaintWorklet, LayoutWorklet)]
+interface CSSMatrixComponent : CSSTransformComponent {
+    constructor(DOMMatrixReadOnly matrix, optional CSSMatrixComponentOptions options = {});
+    attribute DOMMatrix matrix;
+};
+
+dictionary CSSMatrixComponentOptions {
+    boolean is2D;
+};
+
+[Exposed=(Window, Worker, PaintWorklet, LayoutWorklet)]
+interface CSSImageValue : CSSStyleValue {
+};
+
+[Exposed=(Window, Worker, PaintWorklet, LayoutWorklet)]
+interface CSSColorValue : CSSStyleValue {
+    [Exposed=Window] static (CSSColorValue or CSSStyleValue) parse(USVString cssText);
+};
+
+typedef (CSSNumberish or CSSKeywordish) CSSColorRGBComp;
+typedef (CSSNumberish or CSSKeywordish) CSSColorPercent;
+typedef (CSSNumberish or CSSKeywordish) CSSColorNumber;
+typedef (CSSNumberish or CSSKeywordish) CSSColorAngle;
+
+[Exposed=(Window, Worker, PaintWorklet, LayoutWorklet)]
+interface CSSRGB : CSSColorValue {
+    constructor(CSSColorRGBComp r, CSSColorRGBComp g, CSSColorRGBComp b, optional CSSColorPercent alpha = 1);
+    attribute CSSColorRGBComp r;
+    attribute CSSColorRGBComp g;
+    attribute CSSColorRGBComp b;
+    attribute CSSColorPercent alpha;
+};
+
+[Exposed=(Window, Worker, PaintWorklet, LayoutWorklet)]
+interface CSSHSL : CSSColorValue {
+    constructor(CSSColorAngle h, CSSColorPercent s, CSSColorPercent l, optional CSSColorPercent alpha = 1);
+    attribute CSSColorAngle h;
+    attribute CSSColorPercent s;
+    attribute CSSColorPercent l;
+    attribute CSSColorPercent alpha;
+};
+
+[Exposed=(Window, Worker, PaintWorklet, LayoutWorklet)]
+interface CSSHWB : CSSColorValue {
+    constructor(CSSNumericValue h, CSSNumberish w, CSSNumberish b, optional CSSNumberish alpha = 1);
+    attribute CSSNumericValue h;
+    attribute CSSNumberish w;
+    attribute CSSNumberish b;
+    attribute CSSNumberish alpha;
+};
+
+[Exposed=(Window, Worker, PaintWorklet, LayoutWorklet)]
+interface CSSLab : CSSColorValue {
+    constructor(CSSColorPercent l, CSSColorNumber a, CSSColorNumber b, optional CSSColorPercent alpha = 1);
+    attribute CSSColorPercent l;
+    attribute CSSColorNumber a;
+    attribute CSSColorNumber b;
+    attribute CSSColorPercent alpha;
+};
+
+[Exposed=(Window, Worker, PaintWorklet, LayoutWorklet)]
+interface CSSLCH : CSSColorValue {
+    constructor(CSSColorPercent l, CSSColorPercent c, CSSColorAngle h, optional CSSColorPercent alpha = 1);
+    attribute CSSColorPercent l;
+    attribute CSSColorPercent c;
+    attribute CSSColorAngle h;
+    attribute CSSColorPercent alpha;
+};
+
+[Exposed=(Window, Worker, PaintWorklet, LayoutWorklet)]
+interface CSSOKLab : CSSColorValue {
+    constructor(CSSColorPercent l, CSSColorNumber a, CSSColorNumber b, optional CSSColorPercent alpha = 1);
+    attribute CSSColorPercent l;
+    attribute CSSColorNumber a;
+    attribute CSSColorNumber b;
+    attribute CSSColorPercent alpha;
+};
+
+[Exposed=(Window, Worker, PaintWorklet, LayoutWorklet)]
+interface CSSOKLCH : CSSColorValue {
+    constructor(CSSColorPercent l, CSSColorPercent c, CSSColorAngle h, optional CSSColorPercent alpha = 1);
+    attribute CSSColorPercent l;
+    attribute CSSColorPercent c;
+    attribute CSSColorAngle h;
+    attribute CSSColorPercent alpha;
+};
+
+[Exposed=(Window, Worker, PaintWorklet, LayoutWorklet)]
+interface CSSColor : CSSColorValue {
+    constructor(CSSKeywordish colorSpace, sequence<CSSColorPercent> channels, optional CSSNumberish alpha = 1);
+    attribute CSSKeywordish colorSpace;
+    attribute ObservableArray<CSSColorPercent> channels;
+    attribute CSSNumberish alpha;
+};
diff --git a/test/wpt/tests/interfaces/css-view-transitions.idl b/test/wpt/tests/interfaces/css-view-transitions.idl
new file mode 100644
index 00000000000..cf9cb8927e4
--- /dev/null
+++ b/test/wpt/tests/interfaces/css-view-transitions.idl
@@ -0,0 +1,18 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: CSS View Transitions Module Level 1 (https://drafts.csswg.org/css-view-transitions-1/)
+
+partial interface Document {
+  ViewTransition startViewTransition(optional UpdateCallback? callback = null);
+};
+
+callback UpdateCallback = Promise<any> ();
+
+[Exposed=Window]
+interface ViewTransition {
+  undefined skipTransition();
+  readonly attribute Promise<undefined> finished;
+  readonly attribute Promise<undefined> ready;
+  readonly attribute Promise<undefined> updateCallbackDone;
+};
diff --git a/test/wpt/tests/interfaces/cssom-view.idl b/test/wpt/tests/interfaces/cssom-view.idl
new file mode 100644
index 00000000000..4e531a26824
--- /dev/null
+++ b/test/wpt/tests/interfaces/cssom-view.idl
@@ -0,0 +1,200 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: CSSOM View Module (https://drafts.csswg.org/cssom-view-1/)
+
+enum ScrollBehavior { "auto", "instant", "smooth" };
+
+dictionary ScrollOptions {
+    ScrollBehavior behavior = "auto";
+};
+dictionary ScrollToOptions : ScrollOptions {
+    unrestricted double left;
+    unrestricted double top;
+};
+
+partial interface Window {
+    [NewObject] MediaQueryList matchMedia(CSSOMString query);
+    [SameObject, Replaceable] readonly attribute Screen screen;
+    [SameObject, Replaceable] readonly attribute VisualViewport? visualViewport;
+
+    // browsing context
+    undefined moveTo(long x, long y);
+    undefined moveBy(long x, long y);
+    undefined resizeTo(long width, long height);
+    undefined resizeBy(long x, long y);
+
+    // viewport
+    [Replaceable] readonly attribute long innerWidth;
+    [Replaceable] readonly attribute long innerHeight;
+
+    // viewport scrolling
+    [Replaceable] readonly attribute double scrollX;
+    [Replaceable] readonly attribute double pageXOffset;
+    [Replaceable] readonly attribute double scrollY;
+    [Replaceable] readonly attribute double pageYOffset;
+    undefined scroll(optional ScrollToOptions options = {});
+    undefined scroll(unrestricted double x, unrestricted double y);
+    undefined scrollTo(optional ScrollToOptions options = {});
+    undefined scrollTo(unrestricted double x, unrestricted double y);
+    undefined scrollBy(optional ScrollToOptions options = {});
+    undefined scrollBy(unrestricted double x, unrestricted double y);
+
+    // client
+    [Replaceable] readonly attribute long screenX;
+    [Replaceable] readonly attribute long screenLeft;
+    [Replaceable] readonly attribute long screenY;
+    [Replaceable] readonly attribute long screenTop;
+    [Replaceable] readonly attribute long outerWidth;
+    [Replaceable] readonly attribute long outerHeight;
+    [Replaceable] readonly attribute double devicePixelRatio;
+};
+
+[Exposed=Window]
+interface MediaQueryList : EventTarget {
+  readonly attribute CSSOMString media;
+  readonly attribute boolean matches;
+  undefined addListener(EventListener? callback);
+  undefined removeListener(EventListener? callback);
+           attribute EventHandler onchange;
+};
+
+[Exposed=Window]
+interface MediaQueryListEvent : Event {
+  constructor(CSSOMString type, optional MediaQueryListEventInit eventInitDict = {});
+  readonly attribute CSSOMString media;
+  readonly attribute boolean matches;
+};
+
+dictionary MediaQueryListEventInit : EventInit {
+  CSSOMString media = "";
+  boolean matches = false;
+};
+
+[Exposed=Window]
+interface Screen {
+  readonly attribute long availWidth;
+  readonly attribute long availHeight;
+  readonly attribute long width;
+  readonly attribute long height;
+  readonly attribute unsigned long colorDepth;
+  readonly attribute unsigned long pixelDepth;
+};
+
+partial interface Document {
+  Element? elementFromPoint(double x, double y);
+  sequence<Element> elementsFromPoint(double x, double y);
+  CaretPosition? caretPositionFromPoint(double x, double y);
+  readonly attribute Element? scrollingElement;
+};
+
+[Exposed=Window]
+interface CaretPosition {
+  readonly attribute Node offsetNode;
+  readonly attribute unsigned long offset;
+  [NewObject] DOMRect? getClientRect();
+};
+
+enum ScrollLogicalPosition { "start", "center", "end", "nearest" };
+dictionary ScrollIntoViewOptions : ScrollOptions {
+  ScrollLogicalPosition block = "start";
+  ScrollLogicalPosition inline = "nearest";
+};
+
+dictionary CheckVisibilityOptions {
+    boolean checkOpacity = false;
+    boolean checkVisibilityCSS = false;
+};
+
+partial interface Element {
+  DOMRectList getClientRects();
+  [NewObject] DOMRect getBoundingClientRect();
+
+  boolean checkVisibility(optional CheckVisibilityOptions options = {});
+
+  undefined scrollIntoView(optional (boolean or ScrollIntoViewOptions) arg = {});
+  undefined scroll(optional ScrollToOptions options = {});
+  undefined scroll(unrestricted double x, unrestricted double y);
+  undefined scrollTo(optional ScrollToOptions options = {});
+  undefined scrollTo(unrestricted double x, unrestricted double y);
+  undefined scrollBy(optional ScrollToOptions options = {});
+  undefined scrollBy(unrestricted double x, unrestricted double y);
+  attribute unrestricted double scrollTop;
+  attribute unrestricted double scrollLeft;
+  readonly attribute long scrollWidth;
+  readonly attribute long scrollHeight;
+  readonly attribute long clientTop;
+  readonly attribute long clientLeft;
+  readonly attribute long clientWidth;
+  readonly attribute long clientHeight;
+};
+
+partial interface HTMLElement {
+  readonly attribute Element? offsetParent;
+  readonly attribute long offsetTop;
+  readonly attribute long offsetLeft;
+  readonly attribute long offsetWidth;
+  readonly attribute long offsetHeight;
+};
+
+partial interface HTMLImageElement {
+  readonly attribute long x;
+  readonly attribute long y;
+};
+
+partial interface Range {
+  DOMRectList getClientRects();
+  [NewObject] DOMRect getBoundingClientRect();
+};
+
+partial interface MouseEvent {
+  readonly attribute double pageX;
+  readonly attribute double pageY;
+  readonly attribute double x;
+  readonly attribute double y;
+  readonly attribute double offsetX;
+  readonly attribute double offsetY;
+};
+
+enum CSSBoxType { "margin", "border", "padding", "content" };
+dictionary BoxQuadOptions {
+  CSSBoxType box = "border";
+  GeometryNode relativeTo; // XXX default document (i.e. viewport)
+};
+
+dictionary ConvertCoordinateOptions {
+  CSSBoxType fromBox = "border";
+  CSSBoxType toBox = "border";
+};
+
+interface mixin GeometryUtils {
+  sequence<DOMQuad> getBoxQuads(optional BoxQuadOptions options = {});
+  DOMQuad convertQuadFromNode(DOMQuadInit quad, GeometryNode from, optional ConvertCoordinateOptions options = {});
+  DOMQuad convertRectFromNode(DOMRectReadOnly rect, GeometryNode from, optional ConvertCoordinateOptions options = {});
+  DOMPoint convertPointFromNode(DOMPointInit point, GeometryNode from, optional ConvertCoordinateOptions options = {}); // XXX z,w turns into 0
+};
+
+Text includes GeometryUtils; // like Range
+Element includes GeometryUtils;
+CSSPseudoElement includes GeometryUtils;
+Document includes GeometryUtils;
+
+typedef (Text or Element or CSSPseudoElement or Document) GeometryNode;
+
+[Exposed=Window]
+interface VisualViewport : EventTarget {
+  readonly attribute double offsetLeft;
+  readonly attribute double offsetTop;
+
+  readonly attribute double pageLeft;
+  readonly attribute double pageTop;
+
+  readonly attribute double width;
+  readonly attribute double height;
+
+  readonly attribute double scale;
+
+  attribute EventHandler onresize;
+  attribute EventHandler onscroll;
+  attribute EventHandler onscrollend;
+};
diff --git a/test/wpt/tests/interfaces/cssom.idl b/test/wpt/tests/interfaces/cssom.idl
new file mode 100644
index 00000000000..222b3dc09ec
--- /dev/null
+++ b/test/wpt/tests/interfaces/cssom.idl
@@ -0,0 +1,167 @@
+// GENERATED PREAMBLE - DO NOT EDIT
+// CSSOMString is an implementation-defined type of either DOMString or
+// USVString in CSSOM: https://drafts.csswg.org/cssom/#cssomstring-type
+// For web-platform-tests, use DOMString because USVString has additional
+// requirements in type conversion and could result in spurious failures for
+// implementations that use DOMString.
+typedef DOMString CSSOMString;
+
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: CSS Object Model (CSSOM) (https://drafts.csswg.org/cssom-1/)
+
+[Exposed=Window]
+interface MediaList {
+  stringifier attribute [LegacyNullToEmptyString] CSSOMString mediaText;
+  readonly attribute unsigned long length;
+  getter CSSOMString? item(unsigned long index);
+  undefined appendMedium(CSSOMString medium);
+  undefined deleteMedium(CSSOMString medium);
+};
+
+[Exposed=Window]
+interface StyleSheet {
+  readonly attribute CSSOMString type;
+  readonly attribute USVString? href;
+  readonly attribute (Element or ProcessingInstruction)? ownerNode;
+  readonly attribute CSSStyleSheet? parentStyleSheet;
+  readonly attribute DOMString? title;
+  [SameObject, PutForwards=mediaText] readonly attribute MediaList media;
+  attribute boolean disabled;
+};
+
+[Exposed=Window]
+interface CSSStyleSheet : StyleSheet {
+  constructor(optional CSSStyleSheetInit options = {});
+
+  readonly attribute CSSRule? ownerRule;
+  [SameObject] readonly attribute CSSRuleList cssRules;
+  unsigned long insertRule(CSSOMString rule, optional unsigned long index = 0);
+  undefined deleteRule(unsigned long index);
+
+  Promise<CSSStyleSheet> replace(USVString text);
+  undefined replaceSync(USVString text);
+};
+
+dictionary CSSStyleSheetInit {
+  DOMString baseURL = null;
+  (MediaList or DOMString) media = "";
+  boolean disabled = false;
+};
+
+partial interface CSSStyleSheet {
+  [SameObject] readonly attribute CSSRuleList rules;
+  long addRule(optional DOMString selector = "undefined", optional DOMString style = "undefined", optional unsigned long index);
+  undefined removeRule(optional unsigned long index = 0);
+};
+
+[Exposed=Window]
+interface StyleSheetList {
+  getter CSSStyleSheet? item(unsigned long index);
+  readonly attribute unsigned long length;
+};
+
+partial interface mixin DocumentOrShadowRoot {
+  [SameObject] readonly attribute StyleSheetList styleSheets;
+  attribute ObservableArray<CSSStyleSheet> adoptedStyleSheets;
+};
+
+interface mixin LinkStyle {
+  readonly attribute CSSStyleSheet? sheet;
+};
+
+ProcessingInstruction includes LinkStyle;
+[Exposed=Window]
+interface CSSRuleList {
+  getter CSSRule? item(unsigned long index);
+  readonly attribute unsigned long length;
+};
+
+[Exposed=Window]
+interface CSSRule {
+  attribute CSSOMString cssText;
+  readonly attribute CSSRule? parentRule;
+  readonly attribute CSSStyleSheet? parentStyleSheet;
+
+  // the following attribute and constants are historical
+  readonly attribute unsigned short type;
+  const unsigned short STYLE_RULE = 1;
+  const unsigned short CHARSET_RULE = 2;
+  const unsigned short IMPORT_RULE = 3;
+  const unsigned short MEDIA_RULE = 4;
+  const unsigned short FONT_FACE_RULE = 5;
+  const unsigned short PAGE_RULE = 6;
+  const unsigned short MARGIN_RULE = 9;
+  const unsigned short NAMESPACE_RULE = 10;
+};
+
+[Exposed=Window]
+interface CSSStyleRule : CSSRule {
+  attribute CSSOMString selectorText;
+  [SameObject, PutForwards=cssText] readonly attribute CSSStyleDeclaration style;
+};
+
+[Exposed=Window]
+interface CSSImportRule : CSSRule {
+  readonly attribute USVString href;
+  [SameObject, PutForwards=mediaText] readonly attribute MediaList media;
+  [SameObject] readonly attribute CSSStyleSheet styleSheet;
+};
+
+[Exposed=Window]
+interface CSSGroupingRule : CSSRule {
+  [SameObject] readonly attribute CSSRuleList cssRules;
+  unsigned long insertRule(CSSOMString rule, optional unsigned long index = 0);
+  undefined deleteRule(unsigned long index);
+};
+
+[Exposed=Window]
+interface CSSPageRule : CSSGroupingRule {
+           attribute CSSOMString selectorText;
+  [SameObject, PutForwards=cssText] readonly attribute CSSStyleDeclaration style;
+};
+
+[Exposed=Window]
+interface CSSMarginRule : CSSRule {
+  readonly attribute CSSOMString name;
+  [SameObject, PutForwards=cssText] readonly attribute CSSStyleDeclaration style;
+};
+
+[Exposed=Window]
+interface CSSNamespaceRule : CSSRule {
+  readonly attribute CSSOMString namespaceURI;
+  readonly attribute CSSOMString prefix;
+};
+
+[Exposed=Window]
+interface CSSStyleDeclaration {
+  [CEReactions] attribute CSSOMString cssText;
+  readonly attribute unsigned long length;
+  getter CSSOMString item(unsigned long index);
+  CSSOMString getPropertyValue(CSSOMString property);
+  CSSOMString getPropertyPriority(CSSOMString property);
+  [CEReactions] undefined setProperty(CSSOMString property, [LegacyNullToEmptyString] CSSOMString value, optional [LegacyNullToEmptyString] CSSOMString priority = "");
+  [CEReactions] CSSOMString removeProperty(CSSOMString property);
+  readonly attribute CSSRule? parentRule;
+  [CEReactions] attribute [LegacyNullToEmptyString] CSSOMString cssFloat;
+};
+
+interface mixin ElementCSSInlineStyle {
+  [SameObject, PutForwards=cssText] readonly attribute CSSStyleDeclaration style;
+};
+
+HTMLElement includes ElementCSSInlineStyle;
+
+SVGElement includes ElementCSSInlineStyle;
+
+MathMLElement includes ElementCSSInlineStyle;
+
+partial interface Window {
+  [NewObject] CSSStyleDeclaration getComputedStyle(Element elt, optional CSSOMString? pseudoElt);
+};
+
+[Exposed=Window]
+namespace CSS {
+  CSSOMString escape(CSSOMString ident);
+};
diff --git a/test/wpt/tests/interfaces/custom-state-pseudo-class.idl b/test/wpt/tests/interfaces/custom-state-pseudo-class.idl
new file mode 100644
index 00000000000..342f1ede0b0
--- /dev/null
+++ b/test/wpt/tests/interfaces/custom-state-pseudo-class.idl
@@ -0,0 +1,14 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Custom State Pseudo Class (https://wicg.github.io/custom-state-pseudo-class/)
+
+partial interface ElementInternals {
+  readonly attribute CustomStateSet states;
+};
+
+[Exposed=Window]
+interface CustomStateSet {
+  setlike<DOMString>;
+  undefined add(DOMString value);
+};
diff --git a/test/wpt/tests/interfaces/datacue.idl b/test/wpt/tests/interfaces/datacue.idl
new file mode 100644
index 00000000000..f84d6e9b5f1
--- /dev/null
+++ b/test/wpt/tests/interfaces/datacue.idl
@@ -0,0 +1,12 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: DataCue API (https://wicg.github.io/datacue/)
+
+[Exposed=Window]
+interface DataCue : TextTrackCue {
+  constructor(double startTime, unrestricted double endTime,
+              any value, optional DOMString type);
+  attribute any value;
+  readonly attribute DOMString type;
+};
diff --git a/test/wpt/tests/interfaces/deprecation-reporting.idl b/test/wpt/tests/interfaces/deprecation-reporting.idl
new file mode 100644
index 00000000000..4cf76ba8114
--- /dev/null
+++ b/test/wpt/tests/interfaces/deprecation-reporting.idl
@@ -0,0 +1,15 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Deprecation Reporting (https://wicg.github.io/deprecation-reporting/)
+
+[Exposed=(Window,Worker)]
+interface DeprecationReportBody : ReportBody {
+  [Default] object toJSON();
+  readonly attribute DOMString id;
+  readonly attribute object? anticipatedRemoval;
+  readonly attribute DOMString message;
+  readonly attribute DOMString? sourceFile;
+  readonly attribute unsigned long? lineNumber;
+  readonly attribute unsigned long? columnNumber;
+};
diff --git a/test/wpt/tests/interfaces/device-memory.idl b/test/wpt/tests/interfaces/device-memory.idl
new file mode 100644
index 00000000000..e8197e8497d
--- /dev/null
+++ b/test/wpt/tests/interfaces/device-memory.idl
@@ -0,0 +1,14 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Device Memory (https://www.w3.org/TR/device-memory/)
+
+[
+    SecureContext,
+    Exposed=(Window,Worker)
+] interface mixin NavigatorDeviceMemory {
+    readonly attribute double deviceMemory;
+};
+
+Navigator includes NavigatorDeviceMemory;
+WorkerNavigator includes NavigatorDeviceMemory;
diff --git a/test/wpt/tests/interfaces/device-posture.idl b/test/wpt/tests/interfaces/device-posture.idl
new file mode 100644
index 00000000000..ba8f9f51f02
--- /dev/null
+++ b/test/wpt/tests/interfaces/device-posture.idl
@@ -0,0 +1,21 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Device Posture API (https://w3c.github.io/device-posture/)
+
+[SecureContext, Exposed=(Window)]
+partial interface Navigator {
+  [SameObject] readonly attribute DevicePosture devicePosture;
+};
+
+[SecureContext, Exposed=(Window)]
+interface DevicePosture : EventTarget {
+  readonly attribute DevicePostureType type;
+  attribute EventHandler onchange;
+};
+
+enum DevicePostureType {
+  "continuous",
+  "folded",
+  "folded-over"
+};
diff --git a/test/wpt/tests/interfaces/digital-goods.idl b/test/wpt/tests/interfaces/digital-goods.idl
new file mode 100644
index 00000000000..38cedac40cd
--- /dev/null
+++ b/test/wpt/tests/interfaces/digital-goods.idl
@@ -0,0 +1,44 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Digital Goods API (https://wicg.github.io/digital-goods/)
+
+partial interface Window {
+  [SecureContext] Promise<DigitalGoodsService> getDigitalGoodsService(
+      DOMString serviceProvider);
+};
+
+[Exposed=Window, SecureContext] interface DigitalGoodsService {
+
+  Promise<sequence<ItemDetails>> getDetails(sequence<DOMString> itemIds);
+
+  Promise<sequence<PurchaseDetails>> listPurchases();
+
+  Promise<sequence<PurchaseDetails>> listPurchaseHistory();
+
+  Promise<undefined> consume(DOMString purchaseToken);
+};
+
+dictionary ItemDetails {
+  required DOMString itemId;
+  required DOMString title;
+  required PaymentCurrencyAmount price;
+  ItemType type;
+  DOMString description;
+  sequence<DOMString> iconURLs;
+  DOMString subscriptionPeriod;
+  DOMString freeTrialPeriod;
+  PaymentCurrencyAmount introductoryPrice;
+  DOMString introductoryPricePeriod;
+  [EnforceRange] unsigned long long introductoryPriceCycles;
+};
+
+enum ItemType {
+  "product",
+  "subscription",
+};
+
+dictionary PurchaseDetails {
+  required DOMString itemId;
+  required DOMString purchaseToken;
+};
diff --git a/test/wpt/tests/interfaces/edit-context.idl b/test/wpt/tests/interfaces/edit-context.idl
new file mode 100644
index 00000000000..f5e60bd0d02
--- /dev/null
+++ b/test/wpt/tests/interfaces/edit-context.idl
@@ -0,0 +1,113 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: EditContext API (https://w3c.github.io/edit-context/)
+
+partial interface Element {
+     attribute EditContext? editContext;
+};
+
+dictionary EditContextInit {
+    DOMString text;
+    unsigned long selectionStart;
+    unsigned long selectionEnd;
+};
+
+[Exposed=Window]
+interface EditContext : EventTarget {
+    constructor(optional EditContextInit options = {});
+
+    undefined updateText(unsigned long rangeStart, unsigned long rangeEnd,
+        DOMString text);
+    undefined updateSelection(unsigned long start, unsigned long end);
+    undefined updateControlBound(DOMRect controlBound);
+    undefined updateSelectionBound(DOMRect selectionBound);
+    undefined updateCharacterBounds(unsigned long rangeStart, sequence<DOMRect> characterBounds);
+
+    sequence<Element> attachedElements();
+
+    readonly attribute DOMString text;
+    readonly attribute unsigned long selectionStart;
+    readonly attribute unsigned long selectionEnd;
+    readonly attribute unsigned long compositionRangeStart;
+    readonly attribute unsigned long compositionRangeEnd;
+    readonly attribute boolean isInComposition;
+    readonly attribute DOMRect controlBound;
+    readonly attribute DOMRect selectionBound;
+    readonly attribute unsigned long characterBoundsRangeStart;
+    sequence<DOMRect> characterBounds();
+
+    attribute EventHandler ontextupdate;
+    attribute EventHandler ontextformatupdate;
+    attribute EventHandler oncharacterboundsupdate;
+    attribute EventHandler oncompositionstart;
+    attribute EventHandler oncompositionend;
+};
+
+dictionary TextUpdateEventInit {
+    unsigned long updateRangeStart;
+    unsigned long updateRangeEnd;
+    DOMString text;
+    unsigned long selectionStart;
+    unsigned long selectionEnd;
+    unsigned long compositionStart;
+    unsigned long compositionEnd;
+};
+
+[Exposed=Window]
+interface TextUpdateEvent : Event {
+    constructor(optional TextUpdateEventInit options = {});
+    readonly attribute unsigned long updateRangeStart;
+    readonly attribute unsigned long updateRangeEnd;
+    readonly attribute DOMString text;
+    readonly attribute unsigned long selectionStart;
+    readonly attribute unsigned long selectionEnd;
+    readonly attribute unsigned long compositionStart;
+    readonly attribute unsigned long compositionEnd;
+};
+
+dictionary TextFormatInit {
+    unsigned long rangeStart;
+    unsigned long rangeEnd;
+    DOMString textColor;
+    DOMString backgroundColor;
+    DOMString underlineStyle;
+    DOMString underlineThickness;
+    DOMString underlineColor;
+};
+
+[Exposed=Window]
+interface TextFormat {
+    constructor(optional TextFormatInit options = {});
+    attribute unsigned long rangeStart;
+    attribute unsigned long rangeEnd;
+    attribute DOMString textColor;
+    attribute DOMString backgroundColor;
+    attribute DOMString underlineStyle;
+    attribute DOMString underlineThickness;
+    attribute DOMString underlineColor;
+};
+
+dictionary TextFormatUpdateEventInit {
+    sequence<TextFormat> textFormats;
+};
+
+[Exposed=Window]
+interface TextFormatUpdateEvent : Event {
+    constructor(optional TextFormatUpdateEventInit options = {});
+
+    sequence<TextFormat> getTextFormats();
+};
+
+dictionary CharacterBoundsUpdateEventInit {
+    unsigned long rangeStart;
+    unsigned long rangeEnd;
+};
+
+[Exposed=Window]
+interface CharacterBoundsUpdateEvent : Event {
+    constructor(optional CharacterBoundsUpdateEventInit options = {});
+
+    readonly attribute unsigned long rangeStart;
+    readonly attribute unsigned long rangeEnd;
+};
diff --git a/test/wpt/tests/interfaces/element-timing.idl b/test/wpt/tests/interfaces/element-timing.idl
new file mode 100644
index 00000000000..70ca384894f
--- /dev/null
+++ b/test/wpt/tests/interfaces/element-timing.idl
@@ -0,0 +1,22 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Element Timing API (https://wicg.github.io/element-timing/)
+
+[Exposed=Window]
+interface PerformanceElementTiming : PerformanceEntry {
+    readonly attribute DOMHighResTimeStamp renderTime;
+    readonly attribute DOMHighResTimeStamp loadTime;
+    readonly attribute DOMRectReadOnly intersectionRect;
+    readonly attribute DOMString identifier;
+    readonly attribute unsigned long naturalWidth;
+    readonly attribute unsigned long naturalHeight;
+    readonly attribute DOMString id;
+    readonly attribute Element? element;
+    readonly attribute DOMString url;
+    [Default] object toJSON();
+};
+
+partial interface Element {
+    [CEReactions] attribute DOMString elementTiming;
+};
diff --git a/test/wpt/tests/interfaces/encoding.idl b/test/wpt/tests/interfaces/encoding.idl
new file mode 100644
index 00000000000..a8cbe4431a2
--- /dev/null
+++ b/test/wpt/tests/interfaces/encoding.idl
@@ -0,0 +1,59 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Encoding Standard (https://encoding.spec.whatwg.org/)
+
+interface mixin TextDecoderCommon {
+  readonly attribute DOMString encoding;
+  readonly attribute boolean fatal;
+  readonly attribute boolean ignoreBOM;
+};
+
+dictionary TextDecoderOptions {
+  boolean fatal = false;
+  boolean ignoreBOM = false;
+};
+
+dictionary TextDecodeOptions {
+  boolean stream = false;
+};
+
+[Exposed=*]
+interface TextDecoder {
+  constructor(optional DOMString label = "utf-8", optional TextDecoderOptions options = {});
+
+  USVString decode(optional [AllowShared] BufferSource input, optional TextDecodeOptions options = {});
+};
+TextDecoder includes TextDecoderCommon;
+
+interface mixin TextEncoderCommon {
+  readonly attribute DOMString encoding;
+};
+
+dictionary TextEncoderEncodeIntoResult {
+  unsigned long long read;
+  unsigned long long written;
+};
+
+[Exposed=*]
+interface TextEncoder {
+  constructor();
+
+  [NewObject] Uint8Array encode(optional USVString input = "");
+  TextEncoderEncodeIntoResult encodeInto(USVString source, [AllowShared] Uint8Array destination);
+};
+TextEncoder includes TextEncoderCommon;
+
+[Exposed=*]
+interface TextDecoderStream {
+  constructor(optional DOMString label = "utf-8", optional TextDecoderOptions options = {});
+};
+TextDecoderStream includes TextDecoderCommon;
+TextDecoderStream includes GenericTransformStream;
+
+[Exposed=*]
+interface TextEncoderStream {
+  constructor();
+};
+TextEncoderStream includes TextEncoderCommon;
+TextEncoderStream includes GenericTransformStream;
diff --git a/test/wpt/tests/interfaces/encrypted-media.idl b/test/wpt/tests/interfaces/encrypted-media.idl
new file mode 100644
index 00000000000..24db48ecf9c
--- /dev/null
+++ b/test/wpt/tests/interfaces/encrypted-media.idl
@@ -0,0 +1,125 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Encrypted Media Extensions (https://w3c.github.io/encrypted-media/)
+
+[Exposed=Window]
+partial interface Navigator {
+    [SecureContext] Promise<MediaKeySystemAccess> requestMediaKeySystemAccess (DOMString keySystem, sequence<MediaKeySystemConfiguration> supportedConfigurations);
+};
+
+enum MediaKeysRequirement {
+    "required",
+    "optional",
+    "not-allowed"
+};
+
+dictionary MediaKeySystemConfiguration {
+             DOMString                               label = "";
+             sequence<DOMString>                     initDataTypes = [];
+             sequence<MediaKeySystemMediaCapability> audioCapabilities = [];
+             sequence<MediaKeySystemMediaCapability> videoCapabilities = [];
+             MediaKeysRequirement                    distinctiveIdentifier = "optional";
+             MediaKeysRequirement                    persistentState = "optional";
+             sequence<DOMString>                     sessionTypes;
+};
+
+dictionary MediaKeySystemMediaCapability {
+   DOMString contentType = "";
+   DOMString? encryptionScheme = null;
+   DOMString robustness = "";
+};
+
+[Exposed=Window, SecureContext] interface MediaKeySystemAccess {
+    readonly        attribute DOMString keySystem;
+    MediaKeySystemConfiguration getConfiguration ();
+    Promise<MediaKeys>          createMediaKeys ();
+};
+
+enum MediaKeySessionType {
+    "temporary",
+    "persistent-license"
+};
+
+[Exposed=Window, SecureContext] interface MediaKeys {
+    MediaKeySession  createSession (optional MediaKeySessionType sessionType = "temporary");
+    Promise<boolean> setServerCertificate (BufferSource serverCertificate);
+};
+
+enum MediaKeySessionClosedReason {
+    "internal-error",
+    "closed-by-application",
+    "release-acknowledged",
+    "hardware-context-reset",
+    "resource-evicted"
+};
+
+[Exposed=Window, SecureContext] interface MediaKeySession : EventTarget {
+    readonly        attribute DOMString                            sessionId;
+    readonly        attribute unrestricted double                  expiration;
+    readonly        attribute Promise<MediaKeySessionClosedReason> closed;
+    readonly        attribute MediaKeyStatusMap                    keyStatuses;
+                    attribute EventHandler                         onkeystatuseschange;
+                    attribute EventHandler                         onmessage;
+    Promise<undefined>    generateRequest (DOMString initDataType, BufferSource initData);
+    Promise<boolean> load (DOMString sessionId);
+    Promise<undefined>    update (BufferSource response);
+    Promise<undefined>    close ();
+    Promise<undefined>    remove ();
+};
+
+[Exposed=Window, SecureContext] interface MediaKeyStatusMap {
+    iterable<BufferSource,MediaKeyStatus>;
+    readonly        attribute unsigned long size;
+    boolean has (BufferSource keyId);
+    (MediaKeyStatus or undefined)     get (BufferSource keyId);
+};
+
+enum MediaKeyStatus {
+    "usable",
+    "expired",
+    "released",
+    "output-restricted",
+    "output-downscaled",
+    "usable-in-future",
+    "status-pending",
+    "internal-error"
+};
+
+enum MediaKeyMessageType {
+    "license-request",
+    "license-renewal",
+    "license-release",
+    "individualization-request"
+};
+
+[Exposed=Window, SecureContext]
+interface MediaKeyMessageEvent : Event {
+    constructor(DOMString type, MediaKeyMessageEventInit eventInitDict);
+    readonly        attribute MediaKeyMessageType messageType;
+    readonly        attribute ArrayBuffer         message;
+};
+
+dictionary MediaKeyMessageEventInit : EventInit {
+             required MediaKeyMessageType messageType;
+             required ArrayBuffer         message;
+};
+
+[Exposed=Window] partial interface HTMLMediaElement {
+    [SecureContext] readonly        attribute MediaKeys?   mediaKeys;
+                                    attribute EventHandler onencrypted;
+                                    attribute EventHandler onwaitingforkey;
+    [SecureContext] Promise<undefined> setMediaKeys (MediaKeys? mediaKeys);
+};
+
+[Exposed=Window]
+interface MediaEncryptedEvent : Event {
+    constructor(DOMString type, optional MediaEncryptedEventInit eventInitDict = {});
+    readonly        attribute DOMString    initDataType;
+    readonly        attribute ArrayBuffer? initData;
+};
+
+dictionary MediaEncryptedEventInit : EventInit {
+             DOMString    initDataType = "";
+             ArrayBuffer? initData = null;
+};
diff --git a/test/wpt/tests/interfaces/entries-api.idl b/test/wpt/tests/interfaces/entries-api.idl
new file mode 100644
index 00000000000..cd536bc6988
--- /dev/null
+++ b/test/wpt/tests/interfaces/entries-api.idl
@@ -0,0 +1,71 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: File and Directory Entries API (https://wicg.github.io/entries-api/)
+
+partial interface File {
+    readonly attribute USVString webkitRelativePath;
+};
+
+partial interface HTMLInputElement {
+    attribute boolean webkitdirectory;
+    readonly attribute FrozenArray<FileSystemEntry> webkitEntries;
+};
+
+partial interface DataTransferItem {
+    FileSystemEntry? webkitGetAsEntry();
+};
+
+callback ErrorCallback = undefined (DOMException err);
+
+[Exposed=Window]
+interface FileSystemEntry {
+    readonly attribute boolean isFile;
+    readonly attribute boolean isDirectory;
+    readonly attribute USVString name;
+    readonly attribute USVString fullPath;
+    readonly attribute FileSystem filesystem;
+
+    undefined getParent(optional FileSystemEntryCallback successCallback,
+                   optional ErrorCallback errorCallback);
+};
+
+[Exposed=Window]
+interface FileSystemDirectoryEntry : FileSystemEntry {
+    FileSystemDirectoryReader createReader();
+    undefined getFile(optional USVString? path,
+                 optional FileSystemFlags options = {},
+                 optional FileSystemEntryCallback successCallback,
+                 optional ErrorCallback errorCallback);
+    undefined getDirectory(optional USVString? path,
+                      optional FileSystemFlags options = {},
+                      optional FileSystemEntryCallback successCallback,
+                      optional ErrorCallback errorCallback);
+};
+
+dictionary FileSystemFlags {
+    boolean create = false;
+    boolean exclusive = false;
+};
+
+callback FileSystemEntryCallback = undefined (FileSystemEntry entry);
+
+[Exposed=Window]
+interface FileSystemDirectoryReader {
+    undefined readEntries(FileSystemEntriesCallback successCallback,
+                     optional ErrorCallback errorCallback);
+};
+callback FileSystemEntriesCallback = undefined (sequence<FileSystemEntry> entries);
+
+[Exposed=Window]
+interface FileSystemFileEntry : FileSystemEntry {
+    undefined file(FileCallback successCallback,
+              optional ErrorCallback errorCallback);
+};
+callback FileCallback = undefined (File file);
+
+[Exposed=Window]
+interface FileSystem {
+    readonly attribute USVString name;
+    readonly attribute FileSystemDirectoryEntry root;
+};
diff --git a/test/wpt/tests/interfaces/event-timing.idl b/test/wpt/tests/interfaces/event-timing.idl
new file mode 100644
index 00000000000..741a05dc6bc
--- /dev/null
+++ b/test/wpt/tests/interfaces/event-timing.idl
@@ -0,0 +1,29 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Event Timing API (https://w3c.github.io/event-timing)
+
+[Exposed=Window]
+interface PerformanceEventTiming : PerformanceEntry {
+    readonly attribute DOMHighResTimeStamp processingStart;
+    readonly attribute DOMHighResTimeStamp processingEnd;
+    readonly attribute boolean cancelable;
+    readonly attribute Node? target;
+    readonly attribute unsigned long long interactionId;
+    [Default] object toJSON();
+};
+
+[Exposed=Window]
+interface EventCounts {
+    readonly maplike<DOMString, unsigned long long>;
+};
+
+[Exposed=Window]
+partial interface Performance {
+    [SameObject] readonly attribute EventCounts eventCounts;
+    readonly attribute unsigned long long interactionCount;
+};
+
+partial dictionary PerformanceObserverInit {
+    DOMHighResTimeStamp durationThreshold;
+};
diff --git a/test/wpt/tests/interfaces/eyedropper-api.idl b/test/wpt/tests/interfaces/eyedropper-api.idl
new file mode 100644
index 00000000000..62c8c4aea6a
--- /dev/null
+++ b/test/wpt/tests/interfaces/eyedropper-api.idl
@@ -0,0 +1,18 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: EyeDropper API (https://wicg.github.io/eyedropper-api/)
+
+dictionary ColorSelectionResult {
+  DOMString sRGBHex;
+};
+
+dictionary ColorSelectionOptions {
+  AbortSignal signal;
+};
+
+[Exposed=Window, SecureContext]
+interface EyeDropper {
+    constructor();
+    Promise<ColorSelectionResult> open(optional ColorSelectionOptions options = {});
+};
diff --git a/test/wpt/tests/interfaces/fetch.idl b/test/wpt/tests/interfaces/fetch.idl
index ba69c462f62..866d09d31bd 100644
--- a/test/wpt/tests/interfaces/fetch.idl
+++ b/test/wpt/tests/interfaces/fetch.idl
@@ -71,6 +71,7 @@ dictionary RequestInit {
   boolean keepalive;
   AbortSignal? signal;
   RequestDuplex duplex;
+  RequestPriority priority;
   any window; // can only be set to null
 };
 
@@ -80,6 +81,7 @@ enum RequestCredentials { "omit", "same-origin", "include" };
 enum RequestCache { "default", "no-store", "reload", "no-cache", "force-cache", "only-if-cached" };
 enum RequestRedirect { "follow", "error", "manual" };
 enum RequestDuplex { "half" };
+enum RequestPriority { "high", "low", "auto" };
 
 [Exposed=(Window,Worker)]interface Response {
   constructor(optional BodyInit? body = null, optional ResponseInit init = {});
diff --git a/test/wpt/tests/interfaces/fido.idl b/test/wpt/tests/interfaces/fido.idl
new file mode 100644
index 00000000000..32b6c75abd2
--- /dev/null
+++ b/test/wpt/tests/interfaces/fido.idl
@@ -0,0 +1,47 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Client to Authenticator Protocol (CTAP) (https://fidoalliance.org/specs/fido-v2.1-ps-20210615/fido-client-to-authenticator-protocol-v2.1-ps-errata-20220621.html)
+
+partial dictionary AuthenticationExtensionsClientInputs {
+  USVString credentialProtectionPolicy;
+  boolean enforceCredentialProtectionPolicy = false;
+};
+
+partial dictionary AuthenticationExtensionsClientInputs {
+  ArrayBuffer credBlob;
+};
+
+partial dictionary AuthenticationExtensionsClientInputs {
+  boolean getCredBlob;
+};
+
+partial dictionary AuthenticationExtensionsClientInputs {
+  boolean minPinLength;
+};
+
+partial dictionary AuthenticationExtensionsClientInputs {
+  boolean hmacCreateSecret;
+};
+
+dictionary HMACGetSecretInput {
+  required ArrayBuffer salt1;   // 32-byte random data
+  ArrayBuffer salt2;  // Optional additional 32-byte random data
+};
+
+partial dictionary AuthenticationExtensionsClientInputs {
+  HMACGetSecretInput hmacGetSecret;
+};
+
+partial dictionary AuthenticationExtensionsClientOutputs {
+  boolean hmacCreateSecret;
+};
+
+dictionary HMACGetSecretOutput {
+  required ArrayBuffer output1;
+  ArrayBuffer output2;
+};
+
+partial dictionary AuthenticationExtensionsClientOutputs {
+  HMACGetSecretOutput hmacGetSecret;
+};
diff --git a/test/wpt/tests/interfaces/file-system-access.idl b/test/wpt/tests/interfaces/file-system-access.idl
new file mode 100644
index 00000000000..572f9342a40
--- /dev/null
+++ b/test/wpt/tests/interfaces/file-system-access.idl
@@ -0,0 +1,72 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: File System Access (https://wicg.github.io/file-system-access/)
+
+enum FileSystemPermissionMode {
+  "read",
+  "readwrite"
+};
+
+dictionary FileSystemPermissionDescriptor : PermissionDescriptor {
+  required FileSystemHandle handle;
+  FileSystemPermissionMode mode = "read";
+};
+
+dictionary FileSystemHandlePermissionDescriptor {
+  FileSystemPermissionMode mode = "read";
+};
+
+[Exposed=(Window,Worker), SecureContext, Serializable]
+partial interface FileSystemHandle {
+  Promise<PermissionState> queryPermission(optional FileSystemHandlePermissionDescriptor descriptor = {});
+  Promise<PermissionState> requestPermission(optional FileSystemHandlePermissionDescriptor descriptor = {});
+};
+
+enum WellKnownDirectory {
+  "desktop",
+  "documents",
+  "downloads",
+  "music",
+  "pictures",
+  "videos",
+};
+
+typedef (WellKnownDirectory or FileSystemHandle) StartInDirectory;
+
+dictionary FilePickerAcceptType {
+    USVString description;
+    record<USVString, (USVString or sequence<USVString>)> accept;
+};
+
+dictionary FilePickerOptions {
+    sequence<FilePickerAcceptType> types;
+    boolean excludeAcceptAllOption = false;
+    DOMString id;
+    StartInDirectory startIn;
+};
+
+dictionary OpenFilePickerOptions : FilePickerOptions {
+    boolean multiple = false;
+};
+
+dictionary SaveFilePickerOptions : FilePickerOptions {
+    USVString? suggestedName;
+};
+
+dictionary DirectoryPickerOptions {
+    DOMString id;
+    StartInDirectory startIn;
+    FileSystemPermissionMode mode = "read";
+};
+
+[SecureContext]
+partial interface Window {
+    Promise<sequence<FileSystemFileHandle>> showOpenFilePicker(optional OpenFilePickerOptions options = {});
+    Promise<FileSystemFileHandle> showSaveFilePicker(optional SaveFilePickerOptions options = {});
+    Promise<FileSystemDirectoryHandle> showDirectoryPicker(optional DirectoryPickerOptions options = {});
+};
+
+partial interface DataTransferItem {
+    Promise<FileSystemHandle?> getAsFileSystemHandle();
+};
diff --git a/test/wpt/tests/interfaces/filter-effects.idl b/test/wpt/tests/interfaces/filter-effects.idl
new file mode 100644
index 00000000000..ecbb6a94be8
--- /dev/null
+++ b/test/wpt/tests/interfaces/filter-effects.idl
@@ -0,0 +1,341 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Filter Effects Module Level 1 (https://drafts.fxtf.org/filter-effects-1/)
+
+[Exposed=Window]
+interface SVGFilterElement : SVGElement {
+  readonly attribute SVGAnimatedEnumeration filterUnits;
+  readonly attribute SVGAnimatedEnumeration primitiveUnits;
+  readonly attribute SVGAnimatedLength x;
+  readonly attribute SVGAnimatedLength y;
+  readonly attribute SVGAnimatedLength width;
+  readonly attribute SVGAnimatedLength height;
+};
+
+SVGFilterElement includes SVGURIReference;
+
+interface mixin SVGFilterPrimitiveStandardAttributes {
+  readonly attribute SVGAnimatedLength x;
+  readonly attribute SVGAnimatedLength y;
+  readonly attribute SVGAnimatedLength width;
+  readonly attribute SVGAnimatedLength height;
+  readonly attribute SVGAnimatedString result;
+};
+
+[Exposed=Window]
+interface SVGFEBlendElement : SVGElement {
+
+  // Blend Mode Types
+  const unsigned short SVG_FEBLEND_MODE_UNKNOWN = 0;
+  const unsigned short SVG_FEBLEND_MODE_NORMAL = 1;
+  const unsigned short SVG_FEBLEND_MODE_MULTIPLY = 2;
+  const unsigned short SVG_FEBLEND_MODE_SCREEN = 3;
+  const unsigned short SVG_FEBLEND_MODE_DARKEN = 4;
+  const unsigned short SVG_FEBLEND_MODE_LIGHTEN = 5;
+  const unsigned short SVG_FEBLEND_MODE_OVERLAY = 6;
+  const unsigned short SVG_FEBLEND_MODE_COLOR_DODGE = 7;
+  const unsigned short SVG_FEBLEND_MODE_COLOR_BURN = 8;
+  const unsigned short SVG_FEBLEND_MODE_HARD_LIGHT = 9;
+  const unsigned short SVG_FEBLEND_MODE_SOFT_LIGHT = 10;
+  const unsigned short SVG_FEBLEND_MODE_DIFFERENCE = 11;
+  const unsigned short SVG_FEBLEND_MODE_EXCLUSION = 12;
+  const unsigned short SVG_FEBLEND_MODE_HUE = 13;
+  const unsigned short SVG_FEBLEND_MODE_SATURATION = 14;
+  const unsigned short SVG_FEBLEND_MODE_COLOR = 15;
+  const unsigned short SVG_FEBLEND_MODE_LUMINOSITY = 16;
+
+  readonly attribute SVGAnimatedString in1;
+  readonly attribute SVGAnimatedString in2;
+  readonly attribute SVGAnimatedEnumeration mode;
+};
+
+SVGFEBlendElement includes SVGFilterPrimitiveStandardAttributes;
+
+[Exposed=Window]
+interface SVGFEColorMatrixElement : SVGElement {
+
+  // Color Matrix Types
+  const unsigned short SVG_FECOLORMATRIX_TYPE_UNKNOWN = 0;
+  const unsigned short SVG_FECOLORMATRIX_TYPE_MATRIX = 1;
+  const unsigned short SVG_FECOLORMATRIX_TYPE_SATURATE = 2;
+  const unsigned short SVG_FECOLORMATRIX_TYPE_HUEROTATE = 3;
+  const unsigned short SVG_FECOLORMATRIX_TYPE_LUMINANCETOALPHA = 4;
+
+  readonly attribute SVGAnimatedString in1;
+  readonly attribute SVGAnimatedEnumeration type;
+  readonly attribute SVGAnimatedNumberList values;
+};
+
+SVGFEColorMatrixElement includes SVGFilterPrimitiveStandardAttributes;
+
+[Exposed=Window]
+interface SVGFEComponentTransferElement : SVGElement {
+  readonly attribute SVGAnimatedString in1;
+};
+
+SVGFEComponentTransferElement includes SVGFilterPrimitiveStandardAttributes;
+
+[Exposed=Window]
+interface SVGComponentTransferFunctionElement : SVGElement {
+
+  // Component Transfer Types
+  const unsigned short SVG_FECOMPONENTTRANSFER_TYPE_UNKNOWN = 0;
+  const unsigned short SVG_FECOMPONENTTRANSFER_TYPE_IDENTITY = 1;
+  const unsigned short SVG_FECOMPONENTTRANSFER_TYPE_TABLE = 2;
+  const unsigned short SVG_FECOMPONENTTRANSFER_TYPE_DISCRETE = 3;
+  const unsigned short SVG_FECOMPONENTTRANSFER_TYPE_LINEAR = 4;
+  const unsigned short SVG_FECOMPONENTTRANSFER_TYPE_GAMMA = 5;
+
+  readonly attribute SVGAnimatedEnumeration type;
+  readonly attribute SVGAnimatedNumberList tableValues;
+  readonly attribute SVGAnimatedNumber slope;
+  readonly attribute SVGAnimatedNumber intercept;
+  readonly attribute SVGAnimatedNumber amplitude;
+  readonly attribute SVGAnimatedNumber exponent;
+  readonly attribute SVGAnimatedNumber offset;
+};
+
+[Exposed=Window]
+interface SVGFEFuncRElement : SVGComponentTransferFunctionElement {
+};
+
+[Exposed=Window]
+interface SVGFEFuncGElement : SVGComponentTransferFunctionElement {
+};
+
+[Exposed=Window]
+interface SVGFEFuncBElement : SVGComponentTransferFunctionElement {
+};
+
+[Exposed=Window]
+interface SVGFEFuncAElement : SVGComponentTransferFunctionElement {
+};
+
+[Exposed=Window]
+interface SVGFECompositeElement : SVGElement {
+
+  // Composite Operators
+  const unsigned short SVG_FECOMPOSITE_OPERATOR_UNKNOWN = 0;
+  const unsigned short SVG_FECOMPOSITE_OPERATOR_OVER = 1;
+  const unsigned short SVG_FECOMPOSITE_OPERATOR_IN = 2;
+  const unsigned short SVG_FECOMPOSITE_OPERATOR_OUT = 3;
+  const unsigned short SVG_FECOMPOSITE_OPERATOR_ATOP = 4;
+  const unsigned short SVG_FECOMPOSITE_OPERATOR_XOR = 5;
+  const unsigned short SVG_FECOMPOSITE_OPERATOR_ARITHMETIC = 6;
+
+  readonly attribute SVGAnimatedString in1;
+  readonly attribute SVGAnimatedString in2;
+  readonly attribute SVGAnimatedEnumeration operator;
+  readonly attribute SVGAnimatedNumber k1;
+  readonly attribute SVGAnimatedNumber k2;
+  readonly attribute SVGAnimatedNumber k3;
+  readonly attribute SVGAnimatedNumber k4;
+};
+
+SVGFECompositeElement includes SVGFilterPrimitiveStandardAttributes;
+
+[Exposed=Window]
+interface SVGFEConvolveMatrixElement : SVGElement {
+
+  // Edge Mode Values
+  const unsigned short SVG_EDGEMODE_UNKNOWN = 0;
+  const unsigned short SVG_EDGEMODE_DUPLICATE = 1;
+  const unsigned short SVG_EDGEMODE_WRAP = 2;
+  const unsigned short SVG_EDGEMODE_NONE = 3;
+
+  readonly attribute SVGAnimatedString in1;
+  readonly attribute SVGAnimatedInteger orderX;
+  readonly attribute SVGAnimatedInteger orderY;
+  readonly attribute SVGAnimatedNumberList kernelMatrix;
+  readonly attribute SVGAnimatedNumber divisor;
+  readonly attribute SVGAnimatedNumber bias;
+  readonly attribute SVGAnimatedInteger targetX;
+  readonly attribute SVGAnimatedInteger targetY;
+  readonly attribute SVGAnimatedEnumeration edgeMode;
+  readonly attribute SVGAnimatedNumber kernelUnitLengthX;
+  readonly attribute SVGAnimatedNumber kernelUnitLengthY;
+  readonly attribute SVGAnimatedBoolean preserveAlpha;
+};
+
+SVGFEConvolveMatrixElement includes SVGFilterPrimitiveStandardAttributes;
+
+[Exposed=Window]
+interface SVGFEDiffuseLightingElement : SVGElement {
+  readonly attribute SVGAnimatedString in1;
+  readonly attribute SVGAnimatedNumber surfaceScale;
+  readonly attribute SVGAnimatedNumber diffuseConstant;
+  readonly attribute SVGAnimatedNumber kernelUnitLengthX;
+  readonly attribute SVGAnimatedNumber kernelUnitLengthY;
+};
+
+SVGFEDiffuseLightingElement includes SVGFilterPrimitiveStandardAttributes;
+
+[Exposed=Window]
+interface SVGFEDistantLightElement : SVGElement {
+  readonly attribute SVGAnimatedNumber azimuth;
+  readonly attribute SVGAnimatedNumber elevation;
+};
+
+[Exposed=Window]
+interface SVGFEPointLightElement : SVGElement {
+  readonly attribute SVGAnimatedNumber x;
+  readonly attribute SVGAnimatedNumber y;
+  readonly attribute SVGAnimatedNumber z;
+};
+
+[Exposed=Window]
+interface SVGFESpotLightElement : SVGElement {
+  readonly attribute SVGAnimatedNumber x;
+  readonly attribute SVGAnimatedNumber y;
+  readonly attribute SVGAnimatedNumber z;
+  readonly attribute SVGAnimatedNumber pointsAtX;
+  readonly attribute SVGAnimatedNumber pointsAtY;
+  readonly attribute SVGAnimatedNumber pointsAtZ;
+  readonly attribute SVGAnimatedNumber specularExponent;
+  readonly attribute SVGAnimatedNumber limitingConeAngle;
+};
+
+[Exposed=Window]
+interface SVGFEDisplacementMapElement : SVGElement {
+
+  // Channel Selectors
+  const unsigned short SVG_CHANNEL_UNKNOWN = 0;
+  const unsigned short SVG_CHANNEL_R = 1;
+  const unsigned short SVG_CHANNEL_G = 2;
+  const unsigned short SVG_CHANNEL_B = 3;
+  const unsigned short SVG_CHANNEL_A = 4;
+
+  readonly attribute SVGAnimatedString in1;
+  readonly attribute SVGAnimatedString in2;
+  readonly attribute SVGAnimatedNumber scale;
+  readonly attribute SVGAnimatedEnumeration xChannelSelector;
+  readonly attribute SVGAnimatedEnumeration yChannelSelector;
+};
+
+SVGFEDisplacementMapElement includes SVGFilterPrimitiveStandardAttributes;
+
+[Exposed=Window]
+interface SVGFEDropShadowElement : SVGElement {
+  readonly attribute SVGAnimatedString in1;
+  readonly attribute SVGAnimatedNumber dx;
+  readonly attribute SVGAnimatedNumber dy;
+  readonly attribute SVGAnimatedNumber stdDeviationX;
+  readonly attribute SVGAnimatedNumber stdDeviationY;
+
+  undefined setStdDeviation(float stdDeviationX, float stdDeviationY);
+};
+
+SVGFEDropShadowElement includes SVGFilterPrimitiveStandardAttributes;
+
+[Exposed=Window]
+interface SVGFEFloodElement : SVGElement {
+};
+
+SVGFEFloodElement includes SVGFilterPrimitiveStandardAttributes;
+
+[Exposed=Window]
+interface SVGFEGaussianBlurElement : SVGElement {
+
+  // Edge Mode Values
+  const unsigned short SVG_EDGEMODE_UNKNOWN = 0;
+  const unsigned short SVG_EDGEMODE_DUPLICATE = 1;
+  const unsigned short SVG_EDGEMODE_WRAP = 2;
+  const unsigned short SVG_EDGEMODE_NONE = 3;
+
+  readonly attribute SVGAnimatedString in1;
+  readonly attribute SVGAnimatedNumber stdDeviationX;
+  readonly attribute SVGAnimatedNumber stdDeviationY;
+  readonly attribute SVGAnimatedEnumeration edgeMode;
+
+  undefined setStdDeviation(float stdDeviationX, float stdDeviationY);
+};
+
+SVGFEGaussianBlurElement includes SVGFilterPrimitiveStandardAttributes;
+
+[Exposed=Window]
+interface SVGFEImageElement : SVGElement {
+  readonly attribute SVGAnimatedPreserveAspectRatio preserveAspectRatio;
+  readonly attribute SVGAnimatedString crossOrigin;
+};
+
+SVGFEImageElement includes SVGFilterPrimitiveStandardAttributes;
+SVGFEImageElement includes SVGURIReference;
+
+[Exposed=Window]
+interface SVGFEMergeElement : SVGElement {
+};
+
+SVGFEMergeElement includes SVGFilterPrimitiveStandardAttributes;
+
+[Exposed=Window]
+interface SVGFEMergeNodeElement : SVGElement {
+  readonly attribute SVGAnimatedString in1;
+};
+
+[Exposed=Window]
+interface SVGFEMorphologyElement : SVGElement {
+
+  // Morphology Operators
+  const unsigned short SVG_MORPHOLOGY_OPERATOR_UNKNOWN = 0;
+  const unsigned short SVG_MORPHOLOGY_OPERATOR_ERODE = 1;
+  const unsigned short SVG_MORPHOLOGY_OPERATOR_DILATE = 2;
+
+  readonly attribute SVGAnimatedString in1;
+  readonly attribute SVGAnimatedEnumeration operator;
+  readonly attribute SVGAnimatedNumber radiusX;
+  readonly attribute SVGAnimatedNumber radiusY;
+};
+
+SVGFEMorphologyElement includes SVGFilterPrimitiveStandardAttributes;
+
+[Exposed=Window]
+interface SVGFEOffsetElement : SVGElement {
+  readonly attribute SVGAnimatedString in1;
+  readonly attribute SVGAnimatedNumber dx;
+  readonly attribute SVGAnimatedNumber dy;
+};
+
+SVGFEOffsetElement includes SVGFilterPrimitiveStandardAttributes;
+
+[Exposed=Window]
+interface SVGFESpecularLightingElement : SVGElement {
+  readonly attribute SVGAnimatedString in1;
+  readonly attribute SVGAnimatedNumber surfaceScale;
+  readonly attribute SVGAnimatedNumber specularConstant;
+  readonly attribute SVGAnimatedNumber specularExponent;
+  readonly attribute SVGAnimatedNumber kernelUnitLengthX;
+  readonly attribute SVGAnimatedNumber kernelUnitLengthY;
+};
+
+SVGFESpecularLightingElement includes SVGFilterPrimitiveStandardAttributes;
+
+[Exposed=Window]
+interface SVGFETileElement : SVGElement {
+  readonly attribute SVGAnimatedString in1;
+};
+
+SVGFETileElement includes SVGFilterPrimitiveStandardAttributes;
+
+[Exposed=Window]
+interface SVGFETurbulenceElement : SVGElement {
+
+  // Turbulence Types
+  const unsigned short SVG_TURBULENCE_TYPE_UNKNOWN = 0;
+  const unsigned short SVG_TURBULENCE_TYPE_FRACTALNOISE = 1;
+  const unsigned short SVG_TURBULENCE_TYPE_TURBULENCE = 2;
+
+  // Stitch Options
+  const unsigned short SVG_STITCHTYPE_UNKNOWN = 0;
+  const unsigned short SVG_STITCHTYPE_STITCH = 1;
+  const unsigned short SVG_STITCHTYPE_NOSTITCH = 2;
+
+  readonly attribute SVGAnimatedNumber baseFrequencyX;
+  readonly attribute SVGAnimatedNumber baseFrequencyY;
+  readonly attribute SVGAnimatedInteger numOctaves;
+  readonly attribute SVGAnimatedNumber seed;
+  readonly attribute SVGAnimatedEnumeration stitchTiles;
+  readonly attribute SVGAnimatedEnumeration type;
+};
+
+SVGFETurbulenceElement includes SVGFilterPrimitiveStandardAttributes;
diff --git a/test/wpt/tests/interfaces/font-metrics-api.idl b/test/wpt/tests/interfaces/font-metrics-api.idl
new file mode 100644
index 00000000000..9bb94bc3a6a
--- /dev/null
+++ b/test/wpt/tests/interfaces/font-metrics-api.idl
@@ -0,0 +1,42 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Font Metrics API Level 1 (https://drafts.css-houdini.org/font-metrics-api-1/)
+
+partial interface Document {
+    FontMetrics measureElement(Element element);
+    FontMetrics measureText(DOMString text, StylePropertyMapReadOnly styleMap);
+};
+
+[Exposed=Window]
+interface FontMetrics {
+  readonly attribute double width;
+  readonly attribute FrozenArray<double> advances;
+
+  readonly attribute double boundingBoxLeft;
+  readonly attribute double boundingBoxRight;
+
+  readonly attribute double height;
+  readonly attribute double emHeightAscent;
+  readonly attribute double emHeightDescent;
+  readonly attribute double boundingBoxAscent;
+  readonly attribute double boundingBoxDescent;
+  readonly attribute double fontBoundingBoxAscent;
+  readonly attribute double fontBoundingBoxDescent;
+
+  readonly attribute Baseline dominantBaseline;
+  readonly attribute FrozenArray<Baseline> baselines;
+  readonly attribute FrozenArray<Font> fonts;
+};
+
+[Exposed=Window]
+interface Baseline {
+  readonly attribute DOMString name;
+  readonly attribute double value;
+};
+
+[Exposed=Window]
+interface Font {
+  readonly attribute DOMString name;
+  readonly attribute unsigned long glyphsRendered;
+};
diff --git a/test/wpt/tests/interfaces/fs.idl b/test/wpt/tests/interfaces/fs.idl
new file mode 100644
index 00000000000..e341ab387d9
--- /dev/null
+++ b/test/wpt/tests/interfaces/fs.idl
@@ -0,0 +1,97 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: File System Standard (https://fs.spec.whatwg.org/)
+
+enum FileSystemHandleKind {
+  "file",
+  "directory",
+};
+
+[Exposed=(Window,Worker), SecureContext, Serializable]
+interface FileSystemHandle {
+  readonly attribute FileSystemHandleKind kind;
+  readonly attribute USVString name;
+
+  Promise<boolean> isSameEntry(FileSystemHandle other);
+};
+
+dictionary FileSystemCreateWritableOptions {
+  boolean keepExistingData = false;
+};
+
+[Exposed=(Window,Worker), SecureContext, Serializable]
+interface FileSystemFileHandle : FileSystemHandle {
+  Promise<File> getFile();
+  Promise<FileSystemWritableFileStream> createWritable(optional FileSystemCreateWritableOptions options = {});
+  [Exposed=DedicatedWorker]
+  Promise<FileSystemSyncAccessHandle> createSyncAccessHandle();
+};
+
+dictionary FileSystemGetFileOptions {
+  boolean create = false;
+};
+
+dictionary FileSystemGetDirectoryOptions {
+  boolean create = false;
+};
+
+dictionary FileSystemRemoveOptions {
+  boolean recursive = false;
+};
+
+[Exposed=(Window,Worker), SecureContext, Serializable]
+interface FileSystemDirectoryHandle : FileSystemHandle {
+  async iterable<USVString, FileSystemHandle>;
+
+  Promise<FileSystemFileHandle> getFileHandle(USVString name, optional FileSystemGetFileOptions options = {});
+  Promise<FileSystemDirectoryHandle> getDirectoryHandle(USVString name, optional FileSystemGetDirectoryOptions options = {});
+
+  Promise<undefined> removeEntry(USVString name, optional FileSystemRemoveOptions options = {});
+
+  Promise<sequence<USVString>?> resolve(FileSystemHandle possibleDescendant);
+};
+
+enum WriteCommandType {
+  "write",
+  "seek",
+  "truncate",
+};
+
+dictionary WriteParams {
+  required WriteCommandType type;
+  unsigned long long? size;
+  unsigned long long? position;
+  (BufferSource or Blob or USVString)? data;
+};
+
+typedef (BufferSource or Blob or USVString or WriteParams) FileSystemWriteChunkType;
+
+[Exposed=(Window,Worker), SecureContext]
+interface FileSystemWritableFileStream : WritableStream {
+  Promise<undefined> write(FileSystemWriteChunkType data);
+  Promise<undefined> seek(unsigned long long position);
+  Promise<undefined> truncate(unsigned long long size);
+};
+
+dictionary FileSystemReadWriteOptions {
+  [EnforceRange] unsigned long long at;
+};
+
+[Exposed=DedicatedWorker, SecureContext]
+interface FileSystemSyncAccessHandle {
+  unsigned long long read([AllowShared] BufferSource buffer,
+                          optional FileSystemReadWriteOptions options = {});
+  unsigned long long write([AllowShared] BufferSource buffer,
+                           optional FileSystemReadWriteOptions options = {});
+
+  undefined truncate([EnforceRange] unsigned long long newSize);
+  unsigned long long getSize();
+  undefined flush();
+  undefined close();
+};
+
+[SecureContext]
+partial interface StorageManager {
+  Promise<FileSystemDirectoryHandle> getDirectory();
+};
diff --git a/test/wpt/tests/interfaces/fullscreen.idl b/test/wpt/tests/interfaces/fullscreen.idl
new file mode 100644
index 00000000000..2f67f09a394
--- /dev/null
+++ b/test/wpt/tests/interfaces/fullscreen.idl
@@ -0,0 +1,35 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Fullscreen API Standard (https://fullscreen.spec.whatwg.org/)
+
+enum FullscreenNavigationUI {
+  "auto",
+  "show",
+  "hide"
+};
+
+dictionary FullscreenOptions {
+  FullscreenNavigationUI navigationUI = "auto";
+};
+
+partial interface Element {
+  Promise<undefined> requestFullscreen(optional FullscreenOptions options = {});
+
+  attribute EventHandler onfullscreenchange;
+  attribute EventHandler onfullscreenerror;
+};
+
+partial interface Document {
+  [LegacyLenientSetter] readonly attribute boolean fullscreenEnabled;
+  [LegacyLenientSetter, Unscopable] readonly attribute boolean fullscreen; // historical
+
+  Promise<undefined> exitFullscreen();
+
+  attribute EventHandler onfullscreenchange;
+  attribute EventHandler onfullscreenerror;
+};
+
+partial interface mixin DocumentOrShadowRoot {
+  [LegacyLenientSetter] readonly attribute Element? fullscreenElement;
+};
diff --git a/test/wpt/tests/interfaces/gamepad-extensions.idl b/test/wpt/tests/interfaces/gamepad-extensions.idl
new file mode 100644
index 00000000000..ddfc0d9c06a
--- /dev/null
+++ b/test/wpt/tests/interfaces/gamepad-extensions.idl
@@ -0,0 +1,71 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Gamepad Extensions (https://w3c.github.io/gamepad/extensions.html)
+
+enum GamepadHand {
+  "",  /* unknown, both hands, or not applicable */
+  "left",
+  "right"
+};
+
+[Exposed=Window]
+interface GamepadHapticActuator {
+  readonly attribute GamepadHapticActuatorType type;
+  boolean canPlayEffectType(GamepadHapticEffectType type);
+  Promise<GamepadHapticsResult> playEffect(
+      GamepadHapticEffectType type,
+      optional GamepadEffectParameters params = {});
+  Promise<boolean> pulse(double value, double duration);
+  Promise<GamepadHapticsResult> reset();
+};
+
+enum GamepadHapticsResult {
+  "complete",
+  "preempted"
+};
+
+enum GamepadHapticActuatorType {
+  "vibration",
+  "dual-rumble"
+};
+
+enum GamepadHapticEffectType {
+  "dual-rumble"
+};
+
+dictionary GamepadEffectParameters {
+    double duration = 0.0;
+    double startDelay = 0.0;
+    double strongMagnitude = 0.0;
+    double weakMagnitude = 0.0;
+};
+
+[Exposed=Window]
+interface GamepadPose {
+  readonly attribute boolean hasOrientation;
+  readonly attribute boolean hasPosition;
+
+  readonly attribute Float32Array? position;
+  readonly attribute Float32Array? linearVelocity;
+  readonly attribute Float32Array? linearAcceleration;
+  readonly attribute Float32Array? orientation;
+  readonly attribute Float32Array? angularVelocity;
+  readonly attribute Float32Array? angularAcceleration;
+};
+
+[Exposed=Window, SecureContext]
+interface GamepadTouch {
+  readonly attribute unsigned long touchId;
+  readonly attribute octet surfaceId;
+  readonly attribute Float32Array position;
+  readonly attribute Uint32Array? surfaceDimensions;
+};
+
+partial interface Gamepad {
+  readonly attribute GamepadHand hand;
+  readonly attribute FrozenArray<GamepadHapticActuator> hapticActuators;
+  readonly attribute GamepadPose? pose;
+  readonly attribute FrozenArray<GamepadTouch>? touchEvents;
+  [SameObject] readonly attribute GamepadHapticActuator vibrationActuator;
+};
diff --git a/test/wpt/tests/interfaces/gamepad.idl b/test/wpt/tests/interfaces/gamepad.idl
new file mode 100644
index 00000000000..bbc62da3c44
--- /dev/null
+++ b/test/wpt/tests/interfaces/gamepad.idl
@@ -0,0 +1,49 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Gamepad (https://w3c.github.io/gamepad/)
+
+[Exposed=Window, SecureContext]
+interface Gamepad {
+  readonly attribute DOMString id;
+  readonly attribute long index;
+  readonly attribute boolean connected;
+  readonly attribute DOMHighResTimeStamp timestamp;
+  readonly attribute GamepadMappingType mapping;
+  readonly attribute FrozenArray<double> axes;
+  readonly attribute FrozenArray<GamepadButton> buttons;
+};
+
+[Exposed=Window, SecureContext]
+interface GamepadButton {
+  readonly attribute boolean pressed;
+  readonly attribute boolean touched;
+  readonly attribute double value;
+};
+
+enum GamepadMappingType {
+  "",
+  "standard",
+  "xr-standard",
+};
+
+[Exposed=Window]
+partial interface Navigator {
+  sequence<Gamepad?> getGamepads();
+};
+
+[Exposed=Window, SecureContext]
+
+interface GamepadEvent: Event {
+  constructor(DOMString type, GamepadEventInit eventInitDict);
+  [SameObject] readonly attribute Gamepad gamepad;
+};
+
+dictionary GamepadEventInit : EventInit {
+  required Gamepad gamepad;
+};
+
+partial interface mixin WindowEventHandlers {
+  attribute EventHandler ongamepadconnected;
+  attribute EventHandler ongamepaddisconnected;
+};
diff --git a/test/wpt/tests/interfaces/generic-sensor.idl b/test/wpt/tests/interfaces/generic-sensor.idl
new file mode 100644
index 00000000000..157072f6341
--- /dev/null
+++ b/test/wpt/tests/interfaces/generic-sensor.idl
@@ -0,0 +1,60 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Generic Sensor API (https://w3c.github.io/sensors/)
+
+[SecureContext, Exposed=(DedicatedWorker, Window)]
+interface Sensor : EventTarget {
+  readonly attribute boolean activated;
+  readonly attribute boolean hasReading;
+  readonly attribute DOMHighResTimeStamp? timestamp;
+  undefined start();
+  undefined stop();
+  attribute EventHandler onreading;
+  attribute EventHandler onactivate;
+  attribute EventHandler onerror;
+};
+
+dictionary SensorOptions {
+  double frequency;
+};
+
+[SecureContext, Exposed=(DedicatedWorker, Window)]
+interface SensorErrorEvent : Event {
+  constructor(DOMString type, SensorErrorEventInit errorEventInitDict);
+  readonly attribute DOMException error;
+};
+
+dictionary SensorErrorEventInit : EventInit {
+  required DOMException error;
+};
+
+dictionary MockSensorConfiguration {
+  required MockSensorType mockSensorType;
+  boolean connected = true;
+  double? maxSamplingFrequency;
+  double? minSamplingFrequency;
+};
+
+dictionary MockSensor {
+  double maxSamplingFrequency;
+  double minSamplingFrequency;
+  double requestedSamplingFrequency;
+};
+
+enum MockSensorType {
+  "ambient-light",
+  "accelerometer",
+  "linear-acceleration",
+  "gravity",
+  "gyroscope",
+  "magnetometer",
+  "uncalibrated-magnetometer",
+  "absolute-orientation",
+  "relative-orientation",
+  "geolocation",
+  "proximity",
+};
+
+dictionary MockSensorReadingValues {
+};
diff --git a/test/wpt/tests/interfaces/geolocation-sensor.idl b/test/wpt/tests/interfaces/geolocation-sensor.idl
new file mode 100644
index 00000000000..e1d676205ff
--- /dev/null
+++ b/test/wpt/tests/interfaces/geolocation-sensor.idl
@@ -0,0 +1,47 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Geolocation Sensor (https://w3c.github.io/geolocation-sensor/)
+
+[SecureContext,
+ Exposed=(DedicatedWorker, Window)]
+interface GeolocationSensor : Sensor {
+  constructor(optional GeolocationSensorOptions options = {});
+  static Promise<GeolocationSensorReading> read(optional ReadOptions readOptions = {});
+  readonly attribute unrestricted double? latitude;
+  readonly attribute unrestricted double? longitude;
+  readonly attribute unrestricted double? altitude;
+  readonly attribute unrestricted double? accuracy;
+  readonly attribute unrestricted double? altitudeAccuracy;
+  readonly attribute unrestricted double? heading;
+  readonly attribute unrestricted double? speed;
+};
+
+dictionary GeolocationSensorOptions : SensorOptions {
+  // placeholder for GeolocationSensor-specific options
+};
+
+dictionary ReadOptions : GeolocationSensorOptions {
+  AbortSignal? signal;
+};
+
+dictionary GeolocationSensorReading {
+  DOMHighResTimeStamp? timestamp;
+  double? latitude;
+  double? longitude;
+  double? altitude;
+  double? accuracy;
+  double? altitudeAccuracy;
+  double? heading;
+  double? speed;
+};
+
+dictionary GeolocationReadingValues {
+  required double? latitude;
+  required double? longitude;
+  required double? altitude;
+  required double? accuracy;
+  required double? altitudeAccuracy;
+  required double? heading;
+  required double? speed;
+};
diff --git a/test/wpt/tests/interfaces/geolocation.idl b/test/wpt/tests/interfaces/geolocation.idl
new file mode 100644
index 00000000000..4b971f097ba
--- /dev/null
+++ b/test/wpt/tests/interfaces/geolocation.idl
@@ -0,0 +1,65 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Geolocation API (https://w3c.github.io/geolocation-api/)
+
+partial interface Navigator {
+  [SameObject] readonly attribute Geolocation geolocation;
+};
+
+[Exposed=Window]
+interface Geolocation {
+  undefined getCurrentPosition (
+    PositionCallback successCallback,
+    optional PositionErrorCallback? errorCallback = null,
+    optional PositionOptions options = {}
+  );
+
+  long watchPosition (
+    PositionCallback successCallback,
+    optional PositionErrorCallback? errorCallback = null,
+    optional PositionOptions options = {}
+  );
+
+  undefined clearWatch (long watchId);
+};
+
+callback PositionCallback = undefined (
+  GeolocationPosition position
+);
+
+callback PositionErrorCallback = undefined (
+  GeolocationPositionError positionError
+);
+
+dictionary PositionOptions {
+  boolean enableHighAccuracy = false;
+  [Clamp] unsigned long timeout = 0xFFFFFFFF;
+  [Clamp] unsigned long maximumAge = 0;
+};
+
+[Exposed=Window, SecureContext]
+interface GeolocationPosition {
+  readonly attribute GeolocationCoordinates coords;
+  readonly attribute EpochTimeStamp timestamp;
+};
+
+[Exposed=Window, SecureContext]
+interface GeolocationCoordinates {
+  readonly attribute double accuracy;
+  readonly attribute double latitude;
+  readonly attribute double longitude;
+  readonly attribute double? altitude;
+  readonly attribute double? altitudeAccuracy;
+  readonly attribute double? heading;
+  readonly attribute double? speed;
+};
+
+[Exposed=Window]
+interface GeolocationPositionError {
+  const unsigned short PERMISSION_DENIED = 1;
+  const unsigned short POSITION_UNAVAILABLE = 2;
+  const unsigned short TIMEOUT = 3;
+  readonly attribute unsigned short code;
+  readonly attribute DOMString message;
+};
diff --git a/test/wpt/tests/interfaces/geometry.idl b/test/wpt/tests/interfaces/geometry.idl
new file mode 100644
index 00000000000..f7df4499b42
--- /dev/null
+++ b/test/wpt/tests/interfaces/geometry.idl
@@ -0,0 +1,290 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Geometry Interfaces Module Level 1 (https://drafts.fxtf.org/geometry-1/)
+
+[Exposed=(Window,Worker),
+ Serializable]
+interface DOMPointReadOnly {
+    constructor(optional unrestricted double x = 0, optional unrestricted double y = 0,
+            optional unrestricted double z = 0, optional unrestricted double w = 1);
+
+    [NewObject] static DOMPointReadOnly fromPoint(optional DOMPointInit other = {});
+
+    readonly attribute unrestricted double x;
+    readonly attribute unrestricted double y;
+    readonly attribute unrestricted double z;
+    readonly attribute unrestricted double w;
+
+    [NewObject] DOMPoint matrixTransform(optional DOMMatrixInit matrix = {});
+
+    [Default] object toJSON();
+};
+
+[Exposed=(Window,Worker),
+ Serializable,
+ LegacyWindowAlias=SVGPoint]
+interface DOMPoint : DOMPointReadOnly {
+    constructor(optional unrestricted double x = 0, optional unrestricted double y = 0,
+            optional unrestricted double z = 0, optional unrestricted double w = 1);
+
+    [NewObject] static DOMPoint fromPoint(optional DOMPointInit other = {});
+
+    inherit attribute unrestricted double x;
+    inherit attribute unrestricted double y;
+    inherit attribute unrestricted double z;
+    inherit attribute unrestricted double w;
+};
+
+dictionary DOMPointInit {
+    unrestricted double x = 0;
+    unrestricted double y = 0;
+    unrestricted double z = 0;
+    unrestricted double w = 1;
+};
+
+[Exposed=(Window,Worker),
+ Serializable]
+interface DOMRectReadOnly {
+    constructor(optional unrestricted double x = 0, optional unrestricted double y = 0,
+            optional unrestricted double width = 0, optional unrestricted double height = 0);
+
+    [NewObject] static DOMRectReadOnly fromRect(optional DOMRectInit other = {});
+
+    readonly attribute unrestricted double x;
+    readonly attribute unrestricted double y;
+    readonly attribute unrestricted double width;
+    readonly attribute unrestricted double height;
+    readonly attribute unrestricted double top;
+    readonly attribute unrestricted double right;
+    readonly attribute unrestricted double bottom;
+    readonly attribute unrestricted double left;
+
+    [Default] object toJSON();
+};
+
+[Exposed=(Window,Worker),
+ Serializable,
+ LegacyWindowAlias=SVGRect]
+interface DOMRect : DOMRectReadOnly {
+    constructor(optional unrestricted double x = 0, optional unrestricted double y = 0,
+            optional unrestricted double width = 0, optional unrestricted double height = 0);
+
+    [NewObject] static DOMRect fromRect(optional DOMRectInit other = {});
+
+    inherit attribute unrestricted double x;
+    inherit attribute unrestricted double y;
+    inherit attribute unrestricted double width;
+    inherit attribute unrestricted double height;
+};
+
+dictionary DOMRectInit {
+    unrestricted double x = 0;
+    unrestricted double y = 0;
+    unrestricted double width = 0;
+    unrestricted double height = 0;
+};
+
+[Exposed=Window]
+interface DOMRectList {
+    readonly attribute unsigned long length;
+    getter DOMRect? item(unsigned long index);
+};
+
+[Exposed=(Window,Worker),
+ Serializable]
+interface DOMQuad {
+    constructor(optional DOMPointInit p1 = {}, optional DOMPointInit p2 = {},
+            optional DOMPointInit p3 = {}, optional DOMPointInit p4 = {});
+
+    [NewObject] static DOMQuad fromRect(optional DOMRectInit other = {});
+    [NewObject] static DOMQuad fromQuad(optional DOMQuadInit other = {});
+
+    [SameObject] readonly attribute DOMPoint p1;
+    [SameObject] readonly attribute DOMPoint p2;
+    [SameObject] readonly attribute DOMPoint p3;
+    [SameObject] readonly attribute DOMPoint p4;
+    [NewObject] DOMRect getBounds();
+
+    [Default] object toJSON();
+};
+
+dictionary DOMQuadInit {
+  DOMPointInit p1;
+  DOMPointInit p2;
+  DOMPointInit p3;
+  DOMPointInit p4;
+};
+
+[Exposed=(Window,Worker),
+ Serializable]
+interface DOMMatrixReadOnly {
+    constructor(optional (DOMString or sequence<unrestricted double>) init);
+
+    [NewObject] static DOMMatrixReadOnly fromMatrix(optional DOMMatrixInit other = {});
+    [NewObject] static DOMMatrixReadOnly fromFloat32Array(Float32Array array32);
+    [NewObject] static DOMMatrixReadOnly fromFloat64Array(Float64Array array64);
+
+    // These attributes are simple aliases for certain elements of the 4x4 matrix
+    readonly attribute unrestricted double a;
+    readonly attribute unrestricted double b;
+    readonly attribute unrestricted double c;
+    readonly attribute unrestricted double d;
+    readonly attribute unrestricted double e;
+    readonly attribute unrestricted double f;
+
+    readonly attribute unrestricted double m11;
+    readonly attribute unrestricted double m12;
+    readonly attribute unrestricted double m13;
+    readonly attribute unrestricted double m14;
+    readonly attribute unrestricted double m21;
+    readonly attribute unrestricted double m22;
+    readonly attribute unrestricted double m23;
+    readonly attribute unrestricted double m24;
+    readonly attribute unrestricted double m31;
+    readonly attribute unrestricted double m32;
+    readonly attribute unrestricted double m33;
+    readonly attribute unrestricted double m34;
+    readonly attribute unrestricted double m41;
+    readonly attribute unrestricted double m42;
+    readonly attribute unrestricted double m43;
+    readonly attribute unrestricted double m44;
+
+    readonly attribute boolean is2D;
+    readonly attribute boolean isIdentity;
+
+    // Immutable transform methods
+    [NewObject] DOMMatrix translate(optional unrestricted double tx = 0,
+                                    optional unrestricted double ty = 0,
+                                    optional unrestricted double tz = 0);
+    [NewObject] DOMMatrix scale(optional unrestricted double scaleX = 1,
+                                optional unrestricted double scaleY,
+                                optional unrestricted double scaleZ = 1,
+                                optional unrestricted double originX = 0,
+                                optional unrestricted double originY = 0,
+                                optional unrestricted double originZ = 0);
+    [NewObject] DOMMatrix scaleNonUniform(optional unrestricted double scaleX = 1,
+                                          optional unrestricted double scaleY = 1);
+    [NewObject] DOMMatrix scale3d(optional unrestricted double scale = 1,
+                                  optional unrestricted double originX = 0,
+                                  optional unrestricted double originY = 0,
+                                  optional unrestricted double originZ = 0);
+    [NewObject] DOMMatrix rotate(optional unrestricted double rotX = 0,
+                                 optional unrestricted double rotY,
+                                 optional unrestricted double rotZ);
+    [NewObject] DOMMatrix rotateFromVector(optional unrestricted double x = 0,
+                                           optional unrestricted double y = 0);
+    [NewObject] DOMMatrix rotateAxisAngle(optional unrestricted double x = 0,
+                                          optional unrestricted double y = 0,
+                                          optional unrestricted double z = 0,
+                                          optional unrestricted double angle = 0);
+    [NewObject] DOMMatrix skewX(optional unrestricted double sx = 0);
+    [NewObject] DOMMatrix skewY(optional unrestricted double sy = 0);
+    [NewObject] DOMMatrix multiply(optional DOMMatrixInit other = {});
+    [NewObject] DOMMatrix flipX();
+    [NewObject] DOMMatrix flipY();
+    [NewObject] DOMMatrix inverse();
+
+    [NewObject] DOMPoint transformPoint(optional DOMPointInit point = {});
+    [NewObject] Float32Array toFloat32Array();
+    [NewObject] Float64Array toFloat64Array();
+
+    [Exposed=Window] stringifier;
+    [Default] object toJSON();
+};
+
+[Exposed=(Window,Worker),
+ Serializable,
+ LegacyWindowAlias=(SVGMatrix,WebKitCSSMatrix)]
+interface DOMMatrix : DOMMatrixReadOnly {
+    constructor(optional (DOMString or sequence<unrestricted double>) init);
+
+    [NewObject] static DOMMatrix fromMatrix(optional DOMMatrixInit other = {});
+    [NewObject] static DOMMatrix fromFloat32Array(Float32Array array32);
+    [NewObject] static DOMMatrix fromFloat64Array(Float64Array array64);
+
+    // These attributes are simple aliases for certain elements of the 4x4 matrix
+    inherit attribute unrestricted double a;
+    inherit attribute unrestricted double b;
+    inherit attribute unrestricted double c;
+    inherit attribute unrestricted double d;
+    inherit attribute unrestricted double e;
+    inherit attribute unrestricted double f;
+
+    inherit attribute unrestricted double m11;
+    inherit attribute unrestricted double m12;
+    inherit attribute unrestricted double m13;
+    inherit attribute unrestricted double m14;
+    inherit attribute unrestricted double m21;
+    inherit attribute unrestricted double m22;
+    inherit attribute unrestricted double m23;
+    inherit attribute unrestricted double m24;
+    inherit attribute unrestricted double m31;
+    inherit attribute unrestricted double m32;
+    inherit attribute unrestricted double m33;
+    inherit attribute unrestricted double m34;
+    inherit attribute unrestricted double m41;
+    inherit attribute unrestricted double m42;
+    inherit attribute unrestricted double m43;
+    inherit attribute unrestricted double m44;
+
+    // Mutable transform methods
+    DOMMatrix multiplySelf(optional DOMMatrixInit other = {});
+    DOMMatrix preMultiplySelf(optional DOMMatrixInit other = {});
+    DOMMatrix translateSelf(optional unrestricted double tx = 0,
+                            optional unrestricted double ty = 0,
+                            optional unrestricted double tz = 0);
+    DOMMatrix scaleSelf(optional unrestricted double scaleX = 1,
+                        optional unrestricted double scaleY,
+                        optional unrestricted double scaleZ = 1,
+                        optional unrestricted double originX = 0,
+                        optional unrestricted double originY = 0,
+                        optional unrestricted double originZ = 0);
+    DOMMatrix scale3dSelf(optional unrestricted double scale = 1,
+                          optional unrestricted double originX = 0,
+                          optional unrestricted double originY = 0,
+                          optional unrestricted double originZ = 0);
+    DOMMatrix rotateSelf(optional unrestricted double rotX = 0,
+                         optional unrestricted double rotY,
+                         optional unrestricted double rotZ);
+    DOMMatrix rotateFromVectorSelf(optional unrestricted double x = 0,
+                                   optional unrestricted double y = 0);
+    DOMMatrix rotateAxisAngleSelf(optional unrestricted double x = 0,
+                                  optional unrestricted double y = 0,
+                                  optional unrestricted double z = 0,
+                                  optional unrestricted double angle = 0);
+    DOMMatrix skewXSelf(optional unrestricted double sx = 0);
+    DOMMatrix skewYSelf(optional unrestricted double sy = 0);
+    DOMMatrix invertSelf();
+
+    [Exposed=Window] DOMMatrix setMatrixValue(DOMString transformList);
+};
+
+dictionary DOMMatrix2DInit {
+    unrestricted double a;
+    unrestricted double b;
+    unrestricted double c;
+    unrestricted double d;
+    unrestricted double e;
+    unrestricted double f;
+    unrestricted double m11;
+    unrestricted double m12;
+    unrestricted double m21;
+    unrestricted double m22;
+    unrestricted double m41;
+    unrestricted double m42;
+};
+
+dictionary DOMMatrixInit : DOMMatrix2DInit {
+    unrestricted double m13 = 0;
+    unrestricted double m14 = 0;
+    unrestricted double m23 = 0;
+    unrestricted double m24 = 0;
+    unrestricted double m31 = 0;
+    unrestricted double m32 = 0;
+    unrestricted double m33 = 1;
+    unrestricted double m34 = 0;
+    unrestricted double m43 = 0;
+    unrestricted double m44 = 1;
+    boolean is2D;
+};
diff --git a/test/wpt/tests/interfaces/get-installed-related-apps.idl b/test/wpt/tests/interfaces/get-installed-related-apps.idl
new file mode 100644
index 00000000000..e096044c2bc
--- /dev/null
+++ b/test/wpt/tests/interfaces/get-installed-related-apps.idl
@@ -0,0 +1,16 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Get Installed Related Apps API (https://wicg.github.io/get-installed-related-apps/spec/)
+
+dictionary RelatedApplication {
+    required USVString platform;
+    USVString url;
+    DOMString id;
+    USVString version;
+};
+
+[Exposed=Window]
+partial interface Navigator {
+  [SecureContext] Promise<sequence<RelatedApplication>> getInstalledRelatedApps();
+};
diff --git a/test/wpt/tests/interfaces/gyroscope.idl b/test/wpt/tests/interfaces/gyroscope.idl
new file mode 100644
index 00000000000..00fb0efcace
--- /dev/null
+++ b/test/wpt/tests/interfaces/gyroscope.idl
@@ -0,0 +1,24 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Gyroscope (https://w3c.github.io/gyroscope/)
+
+[SecureContext, Exposed=Window]
+interface Gyroscope : Sensor {
+  constructor(optional GyroscopeSensorOptions sensorOptions = {});
+  readonly attribute double? x;
+  readonly attribute double? y;
+  readonly attribute double? z;
+};
+
+enum GyroscopeLocalCoordinateSystem { "device", "screen" };
+
+dictionary GyroscopeSensorOptions : SensorOptions {
+  GyroscopeLocalCoordinateSystem referenceFrame = "device";
+};
+
+dictionary GyroscopeReadingValues {
+  required double? x;
+  required double? y;
+  required double? z;
+};
diff --git a/test/wpt/tests/interfaces/hr-time.idl b/test/wpt/tests/interfaces/hr-time.idl
new file mode 100644
index 00000000000..835ee8a65c8
--- /dev/null
+++ b/test/wpt/tests/interfaces/hr-time.idl
@@ -0,0 +1,19 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: High Resolution Time (https://w3c.github.io/hr-time/)
+
+typedef double DOMHighResTimeStamp;
+
+typedef unsigned long long EpochTimeStamp;
+
+[Exposed=(Window,Worker)]
+interface Performance : EventTarget {
+    DOMHighResTimeStamp now();
+    readonly attribute DOMHighResTimeStamp timeOrigin;
+    [Default] object toJSON();
+};
+
+partial interface mixin WindowOrWorkerGlobalScope {
+  [Replaceable] readonly attribute Performance performance;
+};
diff --git a/test/wpt/tests/interfaces/html-media-capture.idl b/test/wpt/tests/interfaces/html-media-capture.idl
new file mode 100644
index 00000000000..696dce6789f
--- /dev/null
+++ b/test/wpt/tests/interfaces/html-media-capture.idl
@@ -0,0 +1,8 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: HTML Media Capture (https://w3c.github.io/html-media-capture/)
+
+partial interface HTMLInputElement {
+    [CEReactions] attribute DOMString capture;
+};
diff --git a/test/wpt/tests/interfaces/html.idl b/test/wpt/tests/interfaces/html.idl
index 17fe2890bb7..e4752f079ce 100644
--- a/test/wpt/tests/interfaces/html.idl
+++ b/test/wpt/tests/interfaces/html.idl
@@ -98,7 +98,6 @@ partial interface Document {
   // also has obsolete members
 };
 Document includes GlobalEventHandlers;
-Document includes DocumentAndElementEventHandlers;
 
 partial interface mixin DocumentOrShadowRoot {
   readonly attribute Element? activeElement;
@@ -131,7 +130,6 @@ interface HTMLElement : Element {
 };
 
 HTMLElement includes GlobalEventHandlers;
-HTMLElement includes DocumentAndElementEventHandlers;
 HTMLElement includes ElementContentEditable;
 HTMLElement includes HTMLOrSVGElement;
 
@@ -886,7 +884,7 @@ interface HTMLInputElement : HTMLElement {
   [CEReactions] attribute DOMString formTarget;
   [CEReactions] attribute unsigned long height;
   attribute boolean indeterminate;
-  readonly attribute HTMLElement? list;
+  readonly attribute HTMLDataListElement? list;
   [CEReactions] attribute DOMString max;
   [CEReactions] attribute long maxLength;
   [CEReactions] attribute DOMString min;
@@ -1773,20 +1771,6 @@ interface BarProp {
   readonly attribute boolean visible;
 };
 
-enum ScrollRestoration { "auto", "manual" };
-
-[Exposed=Window]
-interface History {
-  readonly attribute unsigned long length;
-  attribute ScrollRestoration scrollRestoration;
-  readonly attribute any state;
-  undefined go(optional long delta = 0);
-  undefined back();
-  undefined forward();
-  undefined pushState(any data, DOMString unused, optional USVString? url = null);
-  undefined replaceState(any data, DOMString unused, optional USVString? url = null);
-};
-
 [Exposed=Window]
 interface Location { // but see also additional creation steps and overridden internal methods
   [LegacyUnforgeable] stringifier attribute USVString href;
@@ -1806,6 +1790,20 @@ interface Location { // but see also additional creation steps and overridden in
   [LegacyUnforgeable, SameObject] readonly attribute DOMStringList ancestorOrigins;
 };
 
+enum ScrollRestoration { "auto", "manual" };
+
+[Exposed=Window]
+interface History {
+  readonly attribute unsigned long length;
+  attribute ScrollRestoration scrollRestoration;
+  readonly attribute any state;
+  undefined go(optional long delta = 0);
+  undefined back();
+  undefined forward();
+  undefined pushState(any data, DOMString unused, optional USVString? url = null);
+  undefined replaceState(any data, DOMString unused, optional USVString? url = null);
+};
+
 [Exposed=Window]
 interface PopStateEvent : Event {
   constructor(DOMString type, optional PopStateEventInit eventInitDict = {});
@@ -1905,7 +1903,9 @@ interface mixin GlobalEventHandlers {
   attribute EventHandler oncontextlost;
   attribute EventHandler oncontextmenu;
   attribute EventHandler oncontextrestored;
+  attribute EventHandler oncopy;
   attribute EventHandler oncuechange;
+  attribute EventHandler oncut;
   attribute EventHandler ondblclick;
   attribute EventHandler ondrag;
   attribute EventHandler ondragend;
@@ -1936,6 +1936,7 @@ interface mixin GlobalEventHandlers {
   attribute EventHandler onmouseout;
   attribute EventHandler onmouseover;
   attribute EventHandler onmouseup;
+  attribute EventHandler onpaste;
   attribute EventHandler onpause;
   attribute EventHandler onplay;
   attribute EventHandler onplaying;
@@ -1944,6 +1945,7 @@ interface mixin GlobalEventHandlers {
   attribute EventHandler onreset;
   attribute EventHandler onresize;
   attribute EventHandler onscroll;
+  attribute EventHandler onscrollend;
   attribute EventHandler onsecuritypolicyviolation;
   attribute EventHandler onseeked;
   attribute EventHandler onseeking;
@@ -1982,12 +1984,6 @@ interface mixin WindowEventHandlers {
   attribute EventHandler onunload;
 };
 
-interface mixin DocumentAndElementEventHandlers {
-  attribute EventHandler oncopy;
-  attribute EventHandler oncut;
-  attribute EventHandler onpaste;
-};
-
 typedef (DOMString or Function) TimerHandler;
 
 interface mixin WindowOrWorkerGlobalScope {
@@ -2136,13 +2132,13 @@ typedef (CanvasImageSource or
          Blob or
          ImageData) ImageBitmapSource;
 
-enum ImageOrientation { "none", "flipY" };
+enum ImageOrientation { "from-image", "flipY" };
 enum PremultiplyAlpha { "none", "premultiply", "default" };
 enum ColorSpaceConversion { "none", "default" };
 enum ResizeQuality { "pixelated", "low", "medium", "high" };
 
 dictionary ImageBitmapOptions {
-  ImageOrientation imageOrientation = "none";
+  ImageOrientation imageOrientation = "from-image";
   PremultiplyAlpha premultiplyAlpha = "default";
   ColorSpaceConversion colorSpaceConversion = "default";
   [EnforceRange] unsigned long resizeWidth;
diff --git a/test/wpt/tests/interfaces/idle-detection.idl b/test/wpt/tests/interfaces/idle-detection.idl
new file mode 100644
index 00000000000..54d42f3ca00
--- /dev/null
+++ b/test/wpt/tests/interfaces/idle-detection.idl
@@ -0,0 +1,31 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Idle Detection API (https://wicg.github.io/idle-detection/)
+
+enum UserIdleState {
+    "active",
+    "idle"
+};
+
+enum ScreenIdleState {
+    "locked",
+    "unlocked"
+};
+
+dictionary IdleOptions {
+  [EnforceRange] unsigned long long threshold;
+  AbortSignal signal;
+};
+
+[
+  SecureContext,
+  Exposed=(Window,DedicatedWorker)
+] interface IdleDetector : EventTarget {
+  constructor();
+  readonly attribute UserIdleState? userState;
+  readonly attribute ScreenIdleState? screenState;
+  attribute EventHandler onchange;
+  [Exposed=Window] static Promise<PermissionState> requestPermission();
+  Promise<undefined> start(optional IdleOptions options = {});
+};
diff --git a/test/wpt/tests/interfaces/image-capture.idl b/test/wpt/tests/interfaces/image-capture.idl
new file mode 100644
index 00000000000..f98912cb6a1
--- /dev/null
+++ b/test/wpt/tests/interfaces/image-capture.idl
@@ -0,0 +1,160 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: MediaStream Image Capture (https://w3c.github.io/mediacapture-image/)
+
+[Exposed=Window]
+interface ImageCapture {
+   constructor(MediaStreamTrack videoTrack);
+   Promise<Blob>              takePhoto(optional PhotoSettings photoSettings = {});
+   Promise<PhotoCapabilities> getPhotoCapabilities();
+   Promise<PhotoSettings>     getPhotoSettings();
+
+   Promise<ImageBitmap>       grabFrame();
+
+   readonly attribute MediaStreamTrack track;
+};
+
+dictionary PhotoCapabilities {
+  RedEyeReduction         redEyeReduction;
+  MediaSettingsRange      imageHeight;
+  MediaSettingsRange      imageWidth;
+  sequence<FillLightMode> fillLightMode;
+};
+
+dictionary PhotoSettings {
+  FillLightMode   fillLightMode;
+  double          imageHeight;
+  double          imageWidth;
+  boolean         redEyeReduction;
+};
+
+dictionary MediaSettingsRange {
+    double max;
+    double min;
+    double step;
+};
+
+enum RedEyeReduction {
+  "never",
+  "always",
+  "controllable"
+};
+
+enum FillLightMode {
+  "auto",
+  "off",
+  "flash"
+};
+
+partial dictionary MediaTrackSupportedConstraints {
+  boolean whiteBalanceMode = true;
+  boolean exposureMode = true;
+  boolean focusMode = true;
+  boolean pointsOfInterest = true;
+
+  boolean exposureCompensation = true;
+  boolean exposureTime = true;
+  boolean colorTemperature = true;
+  boolean iso = true;
+
+  boolean brightness = true;
+  boolean contrast = true;
+  boolean pan = true;
+  boolean saturation = true;
+  boolean sharpness = true;
+  boolean focusDistance = true;
+  boolean tilt = true;
+  boolean zoom = true;
+  boolean torch = true;
+};
+
+partial dictionary MediaTrackCapabilities {
+  sequence<DOMString>  whiteBalanceMode;
+  sequence<DOMString>  exposureMode;
+  sequence<DOMString>  focusMode;
+
+  MediaSettingsRange   exposureCompensation;
+  MediaSettingsRange   exposureTime;
+  MediaSettingsRange   colorTemperature;
+  MediaSettingsRange   iso;
+
+  MediaSettingsRange   brightness;
+  MediaSettingsRange   contrast;
+  MediaSettingsRange   saturation;
+  MediaSettingsRange   sharpness;
+
+  MediaSettingsRange   focusDistance;
+  MediaSettingsRange   pan;
+  MediaSettingsRange   tilt;
+  MediaSettingsRange   zoom;
+
+  boolean              torch;
+};
+
+partial dictionary MediaTrackConstraintSet {
+  ConstrainDOMString           whiteBalanceMode;
+  ConstrainDOMString           exposureMode;
+  ConstrainDOMString           focusMode;
+  ConstrainPoint2D             pointsOfInterest;
+
+  ConstrainDouble              exposureCompensation;
+  ConstrainDouble              exposureTime;
+  ConstrainDouble              colorTemperature;
+  ConstrainDouble              iso;
+
+  ConstrainDouble              brightness;
+  ConstrainDouble              contrast;
+  ConstrainDouble              saturation;
+  ConstrainDouble              sharpness;
+
+  ConstrainDouble              focusDistance;
+  (boolean or ConstrainDouble) pan;
+  (boolean or ConstrainDouble) tilt;
+  (boolean or ConstrainDouble) zoom;
+
+  ConstrainBoolean             torch;
+};
+
+partial dictionary MediaTrackSettings {
+  DOMString         whiteBalanceMode;
+  DOMString         exposureMode;
+  DOMString         focusMode;
+  sequence<Point2D> pointsOfInterest;
+
+  double            exposureCompensation;
+  double            exposureTime;
+  double            colorTemperature;
+  double            iso;
+
+  double            brightness;
+  double            contrast;
+  double            saturation;
+  double            sharpness;
+
+  double            focusDistance;
+  double            pan;
+  double            tilt;
+  double            zoom;
+
+  boolean           torch;
+};
+
+dictionary ConstrainPoint2DParameters {
+  sequence<Point2D> exact;
+  sequence<Point2D> ideal;
+};
+
+typedef (sequence<Point2D> or ConstrainPoint2DParameters) ConstrainPoint2D;
+
+enum MeteringMode {
+  "none",
+  "manual",
+  "single-shot",
+  "continuous"
+};
+
+dictionary Point2D {
+  double x = 0.0;
+  double y = 0.0;
+};
diff --git a/test/wpt/tests/interfaces/image-resource.idl b/test/wpt/tests/interfaces/image-resource.idl
new file mode 100644
index 00000000000..d7f653e6816
--- /dev/null
+++ b/test/wpt/tests/interfaces/image-resource.idl
@@ -0,0 +1,11 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Image Resource (https://w3c.github.io/image-resource/)
+
+dictionary ImageResource {
+  required USVString src;
+  DOMString sizes;
+  DOMString type;
+  DOMString label;
+};
diff --git a/test/wpt/tests/interfaces/ink-enhancement.idl b/test/wpt/tests/interfaces/ink-enhancement.idl
new file mode 100644
index 00000000000..660e2254c9e
--- /dev/null
+++ b/test/wpt/tests/interfaces/ink-enhancement.idl
@@ -0,0 +1,32 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Ink API (https://wicg.github.io/ink-enhancement/)
+
+[Exposed=Window]
+interface Ink {
+    Promise<InkPresenter> requestPresenter(
+        optional InkPresenterParam param = {});
+};
+
+dictionary InkPresenterParam {
+    Element? presentationArea = null;
+};
+
+[Exposed=Window]
+interface InkPresenter {
+    readonly attribute Element? presentationArea;
+    readonly attribute unsigned long expectedImprovement;
+
+    undefined updateInkTrailStartPoint(PointerEvent event, InkTrailStyle style);
+};
+
+dictionary InkTrailStyle {
+    required DOMString color;
+    required unrestricted double diameter;
+};
+
+[Exposed=Window]
+partial interface Navigator {
+    [SameObject] readonly attribute Ink ink;
+};
diff --git a/test/wpt/tests/interfaces/input-device-capabilities.idl b/test/wpt/tests/interfaces/input-device-capabilities.idl
new file mode 100644
index 00000000000..72d91de2fcd
--- /dev/null
+++ b/test/wpt/tests/interfaces/input-device-capabilities.idl
@@ -0,0 +1,24 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Input Device Capabilities (https://wicg.github.io/input-device-capabilities/)
+
+[Exposed=Window]
+interface InputDeviceCapabilities {
+  constructor(optional InputDeviceCapabilitiesInit deviceInitDict = {});
+  readonly attribute boolean firesTouchEvents;
+  readonly attribute boolean pointerMovementScrolls;
+};
+
+dictionary InputDeviceCapabilitiesInit {
+  boolean firesTouchEvents = false;
+  boolean pointerMovementScrolls = false;
+};
+
+partial interface UIEvent {
+  readonly attribute InputDeviceCapabilities? sourceCapabilities;
+};
+
+partial dictionary UIEventInit {
+  InputDeviceCapabilities? sourceCapabilities = null;
+};
diff --git a/test/wpt/tests/interfaces/input-events.idl b/test/wpt/tests/interfaces/input-events.idl
new file mode 100644
index 00000000000..6a2147b93e6
--- /dev/null
+++ b/test/wpt/tests/interfaces/input-events.idl
@@ -0,0 +1,14 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Input Events Level 2 (https://w3c.github.io/input-events/)
+
+partial interface InputEvent {
+   readonly attribute DataTransfer? dataTransfer;
+   sequence<StaticRange> getTargetRanges();
+};
+
+partial dictionary InputEventInit {
+   DataTransfer? dataTransfer = null;
+   sequence<StaticRange> targetRanges = [];
+};
diff --git a/test/wpt/tests/interfaces/intersection-observer.idl b/test/wpt/tests/interfaces/intersection-observer.idl
new file mode 100644
index 00000000000..52db1c4baa9
--- /dev/null
+++ b/test/wpt/tests/interfaces/intersection-observer.idl
@@ -0,0 +1,46 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Intersection Observer (https://w3c.github.io/IntersectionObserver/)
+
+callback IntersectionObserverCallback = undefined (sequence<IntersectionObserverEntry> entries, IntersectionObserver observer);
+
+[Exposed=Window]
+interface IntersectionObserver {
+  constructor(IntersectionObserverCallback callback, optional IntersectionObserverInit options = {});
+  readonly attribute (Element or Document)? root;
+  readonly attribute DOMString rootMargin;
+  readonly attribute FrozenArray<double> thresholds;
+  undefined observe(Element target);
+  undefined unobserve(Element target);
+  undefined disconnect();
+  sequence<IntersectionObserverEntry> takeRecords();
+};
+
+[Exposed=Window]
+interface IntersectionObserverEntry {
+  constructor(IntersectionObserverEntryInit intersectionObserverEntryInit);
+  readonly attribute DOMHighResTimeStamp time;
+  readonly attribute DOMRectReadOnly? rootBounds;
+  readonly attribute DOMRectReadOnly boundingClientRect;
+  readonly attribute DOMRectReadOnly intersectionRect;
+  readonly attribute boolean isIntersecting;
+  readonly attribute double intersectionRatio;
+  readonly attribute Element target;
+};
+
+dictionary IntersectionObserverEntryInit {
+  required DOMHighResTimeStamp time;
+  required DOMRectInit? rootBounds;
+  required DOMRectInit boundingClientRect;
+  required DOMRectInit intersectionRect;
+  required boolean isIntersecting;
+  required double intersectionRatio;
+  required Element target;
+};
+
+dictionary IntersectionObserverInit {
+  (Element or Document)?  root = null;
+  DOMString rootMargin = "0px";
+  (double or sequence<double>) threshold = 0;
+};
diff --git a/test/wpt/tests/interfaces/intervention-reporting.idl b/test/wpt/tests/interfaces/intervention-reporting.idl
new file mode 100644
index 00000000000..3c3b8001e74
--- /dev/null
+++ b/test/wpt/tests/interfaces/intervention-reporting.idl
@@ -0,0 +1,14 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Intervention Reporting (https://wicg.github.io/intervention-reporting/)
+
+[Exposed=(Window,Worker)]
+interface InterventionReportBody : ReportBody {
+  [Default] object toJSON();
+  readonly attribute DOMString id;
+  readonly attribute DOMString message;
+  readonly attribute DOMString? sourceFile;
+  readonly attribute unsigned long? lineNumber;
+  readonly attribute unsigned long? columnNumber;
+};
diff --git a/test/wpt/tests/interfaces/is-input-pending.idl b/test/wpt/tests/interfaces/is-input-pending.idl
new file mode 100644
index 00000000000..735bdf02a1b
--- /dev/null
+++ b/test/wpt/tests/interfaces/is-input-pending.idl
@@ -0,0 +1,16 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Early detection of input events (https://wicg.github.io/is-input-pending/)
+
+dictionary IsInputPendingOptions {
+  boolean includeContinuous = false;
+};
+
+[Exposed=Window] interface Scheduling {
+   boolean isInputPending(optional IsInputPendingOptions isInputPendingOptions = {});
+};
+
+partial interface Navigator {
+  readonly attribute Scheduling scheduling;
+};
diff --git a/test/wpt/tests/interfaces/js-self-profiling.idl b/test/wpt/tests/interfaces/js-self-profiling.idl
new file mode 100644
index 00000000000..04cd1afc733
--- /dev/null
+++ b/test/wpt/tests/interfaces/js-self-profiling.idl
@@ -0,0 +1,44 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: JS Self-Profiling API (https://wicg.github.io/js-self-profiling/)
+
+[Exposed=Window]
+interface Profiler : EventTarget {
+  readonly attribute DOMHighResTimeStamp sampleInterval;
+  readonly attribute boolean stopped;
+
+  constructor(ProfilerInitOptions options);
+  Promise<ProfilerTrace> stop();
+};
+
+typedef DOMString ProfilerResource;
+
+dictionary ProfilerTrace {
+  required sequence<ProfilerResource> resources;
+  required sequence<ProfilerFrame> frames;
+  required sequence<ProfilerStack> stacks;
+  required sequence<ProfilerSample> samples;
+};
+
+dictionary ProfilerSample {
+  required DOMHighResTimeStamp timestamp;
+  unsigned long long stackId;
+};
+
+dictionary ProfilerStack {
+  unsigned long long parentId;
+  required unsigned long long frameId;
+};
+
+dictionary ProfilerFrame {
+  required DOMString name;
+  unsigned long long resourceId;
+  unsigned long long line;
+  unsigned long long column;
+};
+
+dictionary ProfilerInitOptions {
+  required DOMHighResTimeStamp sampleInterval;
+  required unsigned long maxBufferSize;
+};
diff --git a/test/wpt/tests/interfaces/keyboard-lock.idl b/test/wpt/tests/interfaces/keyboard-lock.idl
new file mode 100644
index 00000000000..d81e9924a35
--- /dev/null
+++ b/test/wpt/tests/interfaces/keyboard-lock.idl
@@ -0,0 +1,14 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Keyboard Lock (https://wicg.github.io/keyboard-lock/)
+
+partial interface Navigator {
+  [SecureContext, SameObject] readonly attribute Keyboard keyboard;
+};
+
+[SecureContext, Exposed=Window]
+interface Keyboard : EventTarget {
+  Promise<undefined> lock(optional sequence<DOMString> keyCodes = []);
+  undefined unlock();
+};
diff --git a/test/wpt/tests/interfaces/keyboard-map.idl b/test/wpt/tests/interfaces/keyboard-map.idl
new file mode 100644
index 00000000000..51037348e5d
--- /dev/null
+++ b/test/wpt/tests/interfaces/keyboard-map.idl
@@ -0,0 +1,15 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Keyboard Map (https://wicg.github.io/keyboard-map/)
+
+[Exposed=Window]
+interface KeyboardLayoutMap {
+  readonly maplike<DOMString, DOMString>;
+};
+
+partial interface Keyboard {
+  Promise<KeyboardLayoutMap> getLayoutMap();
+
+  attribute EventHandler onlayoutchange;
+};
diff --git a/test/wpt/tests/interfaces/largest-contentful-paint.idl b/test/wpt/tests/interfaces/largest-contentful-paint.idl
new file mode 100644
index 00000000000..872ba552b0d
--- /dev/null
+++ b/test/wpt/tests/interfaces/largest-contentful-paint.idl
@@ -0,0 +1,15 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Largest Contentful Paint (https://w3c.github.io/largest-contentful-paint/)
+
+[Exposed=Window]
+interface LargestContentfulPaint : PerformanceEntry {
+    readonly attribute DOMHighResTimeStamp renderTime;
+    readonly attribute DOMHighResTimeStamp loadTime;
+    readonly attribute unsigned long size;
+    readonly attribute DOMString id;
+    readonly attribute DOMString url;
+    readonly attribute Element? element;
+    [Default] object toJSON();
+};
diff --git a/test/wpt/tests/interfaces/layout-instability.idl b/test/wpt/tests/interfaces/layout-instability.idl
new file mode 100644
index 00000000000..4fb1b70398e
--- /dev/null
+++ b/test/wpt/tests/interfaces/layout-instability.idl
@@ -0,0 +1,20 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Layout Instability API (https://wicg.github.io/layout-instability/)
+
+[Exposed=Window]
+interface LayoutShift : PerformanceEntry {
+  readonly attribute double value;
+  readonly attribute boolean hadRecentInput;
+  readonly attribute DOMHighResTimeStamp lastInputTime;
+  readonly attribute FrozenArray<LayoutShiftAttribution> sources;
+  [Default] object toJSON();
+};
+
+[Exposed=Window]
+interface LayoutShiftAttribution {
+  readonly attribute Node? node;
+  readonly attribute DOMRectReadOnly previousRect;
+  readonly attribute DOMRectReadOnly currentRect;
+};
diff --git a/test/wpt/tests/interfaces/local-font-access.idl b/test/wpt/tests/interfaces/local-font-access.idl
new file mode 100644
index 00000000000..10e2e1f012e
--- /dev/null
+++ b/test/wpt/tests/interfaces/local-font-access.idl
@@ -0,0 +1,24 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Local Font Access API (https://wicg.github.io/local-font-access/)
+
+[SecureContext]
+partial interface Window {
+  Promise<sequence<FontData>> queryLocalFonts(optional QueryOptions options = {});
+};
+
+dictionary QueryOptions {
+  sequence<DOMString> postscriptNames;
+};
+
+[Exposed=Window]
+interface FontData {
+  Promise<Blob> blob();
+
+  // Names
+  readonly attribute USVString postscriptName;
+  readonly attribute USVString fullName;
+  readonly attribute USVString family;
+  readonly attribute USVString style;
+};
diff --git a/test/wpt/tests/interfaces/longtasks.idl b/test/wpt/tests/interfaces/longtasks.idl
new file mode 100644
index 00000000000..c0aaa7a2979
--- /dev/null
+++ b/test/wpt/tests/interfaces/longtasks.idl
@@ -0,0 +1,19 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Long Tasks API (https://w3c.github.io/longtasks/)
+
+[Exposed=Window]
+interface PerformanceLongTaskTiming : PerformanceEntry {
+    readonly attribute FrozenArray<TaskAttributionTiming> attribution;
+    [Default] object toJSON();
+};
+
+[Exposed=Window]
+interface TaskAttributionTiming : PerformanceEntry {
+    readonly attribute DOMString containerType;
+    readonly attribute DOMString containerSrc;
+    readonly attribute DOMString containerId;
+    readonly attribute DOMString containerName;
+    [Default] object toJSON();
+};
diff --git a/test/wpt/tests/interfaces/magnetometer.idl b/test/wpt/tests/interfaces/magnetometer.idl
new file mode 100644
index 00000000000..45ba9edcfe5
--- /dev/null
+++ b/test/wpt/tests/interfaces/magnetometer.idl
@@ -0,0 +1,46 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Magnetometer (https://w3c.github.io/magnetometer/)
+
+[SecureContext,
+  Exposed=Window]
+interface Magnetometer : Sensor {
+  constructor(optional MagnetometerSensorOptions sensorOptions = {});
+  readonly attribute double? x;
+  readonly attribute double? y;
+  readonly attribute double? z;
+};
+
+enum MagnetometerLocalCoordinateSystem { "device", "screen" };
+
+dictionary MagnetometerSensorOptions : SensorOptions {
+  MagnetometerLocalCoordinateSystem referenceFrame = "device";
+};
+
+[SecureContext,
+  Exposed=Window]
+interface UncalibratedMagnetometer : Sensor {
+  constructor(optional MagnetometerSensorOptions sensorOptions = {});
+  readonly attribute double? x;
+  readonly attribute double? y;
+  readonly attribute double? z;
+  readonly attribute double? xBias;
+  readonly attribute double? yBias;
+  readonly attribute double? zBias;
+};
+
+dictionary MagnetometerReadingValues {
+  required double? x;
+  required double? y;
+  required double? z;
+};
+
+dictionary UncalibratedMagnetometerReadingValues {
+  required double? x;
+  required double? y;
+  required double? z;
+  required double? xBias;
+  required double? yBias;
+  required double? zBias;
+};
diff --git a/test/wpt/tests/interfaces/manifest-incubations.idl b/test/wpt/tests/interfaces/manifest-incubations.idl
new file mode 100644
index 00000000000..bab3998dedd
--- /dev/null
+++ b/test/wpt/tests/interfaces/manifest-incubations.idl
@@ -0,0 +1,24 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Manifest Incubations (https://wicg.github.io/manifest-incubations/)
+
+[Exposed=Window]
+interface BeforeInstallPromptEvent : Event {
+  constructor(DOMString type, optional EventInit eventInitDict = {});
+  Promise<PromptResponseObject> prompt();
+};
+
+dictionary PromptResponseObject {
+  AppBannerPromptOutcome userChoice;
+};
+
+enum AppBannerPromptOutcome {
+  "accepted",
+  "dismissed"
+};
+
+partial interface Window {
+  attribute EventHandler onappinstalled;
+  attribute EventHandler onbeforeinstallprompt;
+};
diff --git a/test/wpt/tests/interfaces/mathml-core.idl b/test/wpt/tests/interfaces/mathml-core.idl
new file mode 100644
index 00000000000..fb5539ec75a
--- /dev/null
+++ b/test/wpt/tests/interfaces/mathml-core.idl
@@ -0,0 +1,9 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: MathML Core (https://w3c.github.io/mathml-core/)
+
+[Exposed=Window]
+interface MathMLElement : Element { };
+MathMLElement includes GlobalEventHandlers;
+MathMLElement includes HTMLOrSVGElement;
diff --git a/test/wpt/tests/interfaces/media-capabilities.idl b/test/wpt/tests/interfaces/media-capabilities.idl
new file mode 100644
index 00000000000..94339b6d1dd
--- /dev/null
+++ b/test/wpt/tests/interfaces/media-capabilities.idl
@@ -0,0 +1,115 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Media Capabilities (https://w3c.github.io/media-capabilities/)
+
+dictionary MediaConfiguration {
+  VideoConfiguration video;
+  AudioConfiguration audio;
+};
+
+dictionary MediaDecodingConfiguration : MediaConfiguration {
+  required MediaDecodingType type;
+  MediaCapabilitiesKeySystemConfiguration keySystemConfiguration;
+};
+
+dictionary MediaEncodingConfiguration : MediaConfiguration {
+  required MediaEncodingType type;
+};
+
+enum MediaDecodingType {
+  "file",
+  "media-source",
+  "webrtc"
+};
+
+enum MediaEncodingType {
+  "record",
+  "webrtc"
+};
+
+dictionary VideoConfiguration {
+  required DOMString contentType;
+  required unsigned long width;
+  required unsigned long height;
+  required unsigned long long bitrate;
+  required double framerate;
+  boolean hasAlphaChannel;
+  HdrMetadataType hdrMetadataType;
+  ColorGamut colorGamut;
+  TransferFunction transferFunction;
+  DOMString scalabilityMode;
+  boolean spatialScalability;
+};
+
+enum HdrMetadataType {
+  "smpteSt2086",
+  "smpteSt2094-10",
+  "smpteSt2094-40"
+};
+
+enum ColorGamut {
+  "srgb",
+  "p3",
+  "rec2020"
+};
+
+enum TransferFunction {
+  "srgb",
+  "pq",
+  "hlg"
+};
+
+dictionary AudioConfiguration {
+  required DOMString contentType;
+  DOMString channels;
+  unsigned long long bitrate;
+  unsigned long samplerate;
+  boolean spatialRendering;
+};
+
+dictionary MediaCapabilitiesKeySystemConfiguration {
+  required DOMString keySystem;
+  DOMString initDataType = "";
+  MediaKeysRequirement distinctiveIdentifier = "optional";
+  MediaKeysRequirement persistentState = "optional";
+  sequence<DOMString> sessionTypes;
+  KeySystemTrackConfiguration audio;
+  KeySystemTrackConfiguration video;
+};
+
+dictionary KeySystemTrackConfiguration {
+  DOMString robustness = "";
+  DOMString? encryptionScheme = null;
+};
+
+dictionary MediaCapabilitiesInfo {
+  required boolean supported;
+  required boolean smooth;
+  required boolean powerEfficient;
+};
+
+dictionary MediaCapabilitiesDecodingInfo : MediaCapabilitiesInfo {
+  required MediaKeySystemAccess keySystemAccess;
+  MediaDecodingConfiguration configuration;
+};
+
+dictionary MediaCapabilitiesEncodingInfo : MediaCapabilitiesInfo {
+  MediaEncodingConfiguration configuration;
+};
+
+[Exposed=Window]
+partial interface Navigator {
+  [SameObject] readonly attribute MediaCapabilities mediaCapabilities;
+};
+
+[Exposed=Worker]
+partial interface WorkerNavigator {
+  [SameObject] readonly attribute MediaCapabilities mediaCapabilities;
+};
+
+[Exposed=(Window, Worker)]
+interface MediaCapabilities {
+  [NewObject] Promise<MediaCapabilitiesDecodingInfo> decodingInfo(MediaDecodingConfiguration configuration);
+  [NewObject] Promise<MediaCapabilitiesEncodingInfo> encodingInfo(MediaEncodingConfiguration configuration);
+};
diff --git a/test/wpt/tests/interfaces/media-playback-quality.idl b/test/wpt/tests/interfaces/media-playback-quality.idl
new file mode 100644
index 00000000000..f73d8dbd598
--- /dev/null
+++ b/test/wpt/tests/interfaces/media-playback-quality.idl
@@ -0,0 +1,18 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Media Playback Quality (https://w3c.github.io/media-playback-quality/)
+
+partial interface HTMLVideoElement {
+  VideoPlaybackQuality getVideoPlaybackQuality();
+};
+
+[Exposed=Window]
+interface VideoPlaybackQuality {
+  readonly attribute DOMHighResTimeStamp creationTime;
+  readonly attribute unsigned long droppedVideoFrames;
+  readonly attribute unsigned long totalVideoFrames;
+
+  // Deprecated!
+  readonly attribute unsigned long corruptedVideoFrames;
+};
diff --git a/test/wpt/tests/interfaces/media-source.idl b/test/wpt/tests/interfaces/media-source.idl
new file mode 100644
index 00000000000..11059437f62
--- /dev/null
+++ b/test/wpt/tests/interfaces/media-source.idl
@@ -0,0 +1,91 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Media Source Extensions™ (https://w3c.github.io/media-source/)
+
+enum ReadyState {
+    "closed",
+    "open",
+    "ended"
+};
+
+enum EndOfStreamError {
+    "network",
+    "decode"
+};
+
+[Exposed=(Window,DedicatedWorker)]
+interface MediaSource : EventTarget {
+    constructor();
+
+    [ SameObject, Exposed=DedicatedWorker ]
+    readonly              attribute MediaSourceHandle   handle;
+
+    readonly              attribute SourceBufferList    sourceBuffers;
+    readonly              attribute SourceBufferList    activeSourceBuffers;
+    readonly              attribute ReadyState          readyState;
+                          attribute unrestricted double duration;
+                          attribute EventHandler        onsourceopen;
+                          attribute EventHandler        onsourceended;
+                          attribute EventHandler        onsourceclose;
+    static readonly       attribute boolean canConstructInDedicatedWorker;
+    SourceBuffer          addSourceBuffer (DOMString type);
+    undefined             removeSourceBuffer (SourceBuffer sourceBuffer);
+    undefined             endOfStream (optional EndOfStreamError error);
+    undefined             setLiveSeekableRange (double start, double end);
+    undefined             clearLiveSeekableRange ();
+    static boolean        isTypeSupported (DOMString type);
+};
+
+[Transferable, Exposed=(Window,DedicatedWorker)]
+interface MediaSourceHandle {};
+
+enum AppendMode {
+    "segments",
+    "sequence"
+};
+
+[Exposed=(Window,DedicatedWorker)]
+interface SourceBuffer : EventTarget {
+                    attribute AppendMode          mode;
+    readonly        attribute boolean             updating;
+    readonly        attribute TimeRanges          buffered;
+                    attribute double              timestampOffset;
+    readonly        attribute AudioTrackList      audioTracks;
+    readonly        attribute VideoTrackList      videoTracks;
+    readonly        attribute TextTrackList       textTracks;
+                    attribute double              appendWindowStart;
+                    attribute unrestricted double appendWindowEnd;
+                    attribute EventHandler        onupdatestart;
+                    attribute EventHandler        onupdate;
+                    attribute EventHandler        onupdateend;
+                    attribute EventHandler        onerror;
+                    attribute EventHandler        onabort;
+    undefined appendBuffer (BufferSource data);
+    undefined abort ();
+    undefined changeType (DOMString type);
+    undefined remove (double start, unrestricted double end);
+};
+
+[Exposed=(Window,DedicatedWorker)]
+interface SourceBufferList : EventTarget {
+    readonly        attribute unsigned long length;
+                    attribute EventHandler  onaddsourcebuffer;
+                    attribute EventHandler  onremovesourcebuffer;
+    getter SourceBuffer (unsigned long index);
+};
+
+[Exposed=(Window,DedicatedWorker)]
+partial interface AudioTrack {
+    readonly        attribute SourceBuffer? sourceBuffer;
+};
+
+[Exposed=(Window,DedicatedWorker)]
+partial interface VideoTrack {
+    readonly        attribute SourceBuffer? sourceBuffer;
+};
+
+[Exposed=(Window,DedicatedWorker)]
+partial interface TextTrack {
+    readonly        attribute SourceBuffer? sourceBuffer;
+};
diff --git a/test/wpt/tests/interfaces/mediacapture-automation.idl b/test/wpt/tests/interfaces/mediacapture-automation.idl
new file mode 100644
index 00000000000..9fe2623d646
--- /dev/null
+++ b/test/wpt/tests/interfaces/mediacapture-automation.idl
@@ -0,0 +1,36 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Media Capture Automation (https://w3c.github.io/mediacapture-automation/)
+
+enum MockCapturePromptResult {
+  "granted",
+  "denied"
+};
+
+dictionary MockCapturePromptResultConfiguration {
+  MockCapturePromptResult getUserMedia;
+  MockCapturePromptResult getDisplayMedia;
+};
+
+dictionary MockCaptureDeviceConfiguration {
+  DOMString label;
+  DOMString deviceId;
+  DOMString groupId;
+};
+
+dictionary MockCameraConfiguration : MockCaptureDeviceConfiguration {
+  double defaultFrameRate = 30;
+  DOMString facingMode = "user";
+  // TODO: Add more capabilities parameters like:
+  // ULongRange width;
+  // ULongRange height;
+  // DoubleRange frameRate;
+};
+
+dictionary MockMicrophoneConfiguration : MockCaptureDeviceConfiguration {
+  unsigned long defaultSampleRate = 44100;
+  // TODO: Add more capabilities parameters like:
+  // ULongRange sampleRate;
+  // sequence echoCancellation;
+};
diff --git a/test/wpt/tests/interfaces/mediacapture-fromelement.idl b/test/wpt/tests/interfaces/mediacapture-fromelement.idl
new file mode 100644
index 00000000000..b25f87018df
--- /dev/null
+++ b/test/wpt/tests/interfaces/mediacapture-fromelement.idl
@@ -0,0 +1,17 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Media Capture from DOM Elements (https://w3c.github.io/mediacapture-fromelement/)
+
+partial interface HTMLMediaElement {
+    MediaStream captureStream ();
+};
+
+partial interface HTMLCanvasElement {
+    MediaStream captureStream (optional double frameRequestRate);
+};
+
+[Exposed=Window] interface CanvasCaptureMediaStreamTrack : MediaStreamTrack {
+    readonly        attribute HTMLCanvasElement canvas;
+    undefined requestFrame ();
+};
diff --git a/test/wpt/tests/interfaces/mediacapture-handle-actions.idl b/test/wpt/tests/interfaces/mediacapture-handle-actions.idl
new file mode 100644
index 00000000000..408f8e83bbc
--- /dev/null
+++ b/test/wpt/tests/interfaces/mediacapture-handle-actions.idl
@@ -0,0 +1,31 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: The Capture-Handle Actions Mechanism (https://w3c.github.io/mediacapture-handle/actions/)
+
+partial interface MediaDevices {
+  undefined setSupportedCaptureActions(sequence<DOMString> actions);
+  attribute EventHandler oncaptureaction;
+};
+
+enum CaptureAction {
+  "next",
+  "previous",
+  "first",
+  "last"
+};
+
+[Exposed=Window]
+interface CaptureActionEvent : Event {
+  constructor(optional CaptureActionEventInit init = {});
+  readonly attribute CaptureAction action;
+};
+
+dictionary CaptureActionEventInit : EventInit {
+  DOMString action;
+};
+
+partial interface MediaStreamTrack {
+  sequence<DOMString> getSupportedCaptureActions();
+  Promise<undefined> sendCaptureAction(CaptureAction action);
+};
diff --git a/test/wpt/tests/interfaces/mediacapture-region.idl b/test/wpt/tests/interfaces/mediacapture-region.idl
new file mode 100644
index 00000000000..7a5fb7ffd2f
--- /dev/null
+++ b/test/wpt/tests/interfaces/mediacapture-region.idl
@@ -0,0 +1,15 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Region Capture (https://w3c.github.io/mediacapture-region/)
+
+[Exposed=(Window,Worker), Serializable]
+interface CropTarget {
+  [Exposed=Window, SecureContext] static Promise<CropTarget> fromElement(Element element);
+};
+
+[Exposed = Window]
+interface BrowserCaptureMediaStreamTrack : MediaStreamTrack {
+  Promise<undefined> cropTo(CropTarget? cropTarget);
+  BrowserCaptureMediaStreamTrack clone();
+};
diff --git a/test/wpt/tests/interfaces/mediacapture-streams.idl b/test/wpt/tests/interfaces/mediacapture-streams.idl
new file mode 100644
index 00000000000..5b41f3fa653
--- /dev/null
+++ b/test/wpt/tests/interfaces/mediacapture-streams.idl
@@ -0,0 +1,248 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Media Capture and Streams (https://w3c.github.io/mediacapture-main/)
+
+[Exposed=Window]
+interface MediaStream : EventTarget {
+  constructor();
+  constructor(MediaStream stream);
+  constructor(sequence<MediaStreamTrack> tracks);
+  readonly attribute DOMString id;
+  sequence<MediaStreamTrack> getAudioTracks();
+  sequence<MediaStreamTrack> getVideoTracks();
+  sequence<MediaStreamTrack> getTracks();
+  MediaStreamTrack? getTrackById(DOMString trackId);
+  undefined addTrack(MediaStreamTrack track);
+  undefined removeTrack(MediaStreamTrack track);
+  MediaStream clone();
+  readonly attribute boolean active;
+  attribute EventHandler onaddtrack;
+  attribute EventHandler onremovetrack;
+};
+
+[Exposed=Window]
+interface MediaStreamTrack : EventTarget {
+  readonly attribute DOMString kind;
+  readonly attribute DOMString id;
+  readonly attribute DOMString label;
+  attribute boolean enabled;
+  readonly attribute boolean muted;
+  attribute EventHandler onmute;
+  attribute EventHandler onunmute;
+  readonly attribute MediaStreamTrackState readyState;
+  attribute EventHandler onended;
+  MediaStreamTrack clone();
+  undefined stop();
+  MediaTrackCapabilities getCapabilities();
+  MediaTrackConstraints getConstraints();
+  MediaTrackSettings getSettings();
+  Promise<undefined> applyConstraints(optional MediaTrackConstraints constraints = {});
+};
+
+enum MediaStreamTrackState {
+  "live",
+  "ended"
+};
+
+dictionary MediaTrackSupportedConstraints {
+  boolean width = true;
+  boolean height = true;
+  boolean aspectRatio = true;
+  boolean frameRate = true;
+  boolean facingMode = true;
+  boolean resizeMode = true;
+  boolean sampleRate = true;
+  boolean sampleSize = true;
+  boolean echoCancellation = true;
+  boolean autoGainControl = true;
+  boolean noiseSuppression = true;
+  boolean latency = true;
+  boolean channelCount = true;
+  boolean deviceId = true;
+  boolean groupId = true;
+};
+
+dictionary MediaTrackCapabilities {
+  ULongRange width;
+  ULongRange height;
+  DoubleRange aspectRatio;
+  DoubleRange frameRate;
+  sequence<DOMString> facingMode;
+  sequence<DOMString> resizeMode;
+  ULongRange sampleRate;
+  ULongRange sampleSize;
+  sequence<boolean> echoCancellation;
+  sequence<boolean> autoGainControl;
+  sequence<boolean> noiseSuppression;
+  DoubleRange latency;
+  ULongRange channelCount;
+  DOMString deviceId;
+  DOMString groupId;
+};
+
+dictionary MediaTrackConstraints : MediaTrackConstraintSet {
+  sequence<MediaTrackConstraintSet> advanced;
+};
+
+dictionary MediaTrackConstraintSet {
+  ConstrainULong width;
+  ConstrainULong height;
+  ConstrainDouble aspectRatio;
+  ConstrainDouble frameRate;
+  ConstrainDOMString facingMode;
+  ConstrainDOMString resizeMode;
+  ConstrainULong sampleRate;
+  ConstrainULong sampleSize;
+  ConstrainBoolean echoCancellation;
+  ConstrainBoolean autoGainControl;
+  ConstrainBoolean noiseSuppression;
+  ConstrainDouble latency;
+  ConstrainULong channelCount;
+  ConstrainDOMString deviceId;
+  ConstrainDOMString groupId;
+};
+
+dictionary MediaTrackSettings {
+  long width;
+  long height;
+  double aspectRatio;
+  double frameRate;
+  DOMString facingMode;
+  DOMString resizeMode;
+  long sampleRate;
+  long sampleSize;
+  boolean echoCancellation;
+  boolean autoGainControl;
+  boolean noiseSuppression;
+  double latency;
+  long channelCount;
+  DOMString deviceId;
+  DOMString groupId;
+};
+
+enum VideoFacingModeEnum {
+  "user",
+  "environment",
+  "left",
+  "right"
+};
+
+enum VideoResizeModeEnum {
+  "none",
+  "crop-and-scale"
+};
+
+[Exposed=Window]
+interface MediaStreamTrackEvent : Event {
+  constructor(DOMString type, MediaStreamTrackEventInit eventInitDict);
+  [SameObject] readonly attribute MediaStreamTrack track;
+};
+
+dictionary MediaStreamTrackEventInit : EventInit {
+  required MediaStreamTrack track;
+};
+
+[Exposed=Window]
+interface OverconstrainedError : DOMException {
+  constructor(DOMString constraint, optional DOMString message = "");
+  readonly attribute DOMString constraint;
+};
+
+partial interface Navigator {
+  [SameObject, SecureContext] readonly attribute MediaDevices mediaDevices;
+};
+
+[Exposed=Window, SecureContext]
+interface MediaDevices : EventTarget {
+  attribute EventHandler ondevicechange;
+  Promise<sequence<MediaDeviceInfo>> enumerateDevices();
+};
+
+[Exposed=Window, SecureContext]
+interface MediaDeviceInfo {
+  readonly attribute DOMString deviceId;
+  readonly attribute MediaDeviceKind kind;
+  readonly attribute DOMString label;
+  readonly attribute DOMString groupId;
+  [Default] object toJSON();
+};
+
+enum MediaDeviceKind {
+  "audioinput",
+  "audiooutput",
+  "videoinput"
+};
+
+[Exposed=Window, SecureContext]
+interface InputDeviceInfo : MediaDeviceInfo {
+  MediaTrackCapabilities getCapabilities();
+};
+
+partial interface MediaDevices {
+  MediaTrackSupportedConstraints getSupportedConstraints();
+  Promise<MediaStream> getUserMedia(optional MediaStreamConstraints constraints = {});
+};
+
+dictionary MediaStreamConstraints {
+  (boolean or MediaTrackConstraints) video = false;
+  (boolean or MediaTrackConstraints) audio = false;
+};
+
+partial interface Navigator {
+  [SecureContext] undefined getUserMedia(MediaStreamConstraints constraints,
+                                    NavigatorUserMediaSuccessCallback successCallback,
+                                    NavigatorUserMediaErrorCallback errorCallback);
+};
+
+callback NavigatorUserMediaSuccessCallback = undefined (MediaStream stream);
+
+callback NavigatorUserMediaErrorCallback = undefined (DOMException error);
+
+dictionary DoubleRange {
+  double max;
+  double min;
+};
+
+dictionary ConstrainDoubleRange : DoubleRange {
+  double exact;
+  double ideal;
+};
+
+dictionary ULongRange {
+  [Clamp] unsigned long max;
+  [Clamp] unsigned long min;
+};
+
+dictionary ConstrainULongRange : ULongRange {
+  [Clamp] unsigned long exact;
+  [Clamp] unsigned long ideal;
+};
+
+dictionary ConstrainBooleanParameters {
+  boolean exact;
+  boolean ideal;
+};
+
+dictionary ConstrainDOMStringParameters {
+  (DOMString or sequence<DOMString>) exact;
+  (DOMString or sequence<DOMString>) ideal;
+};
+
+typedef ([Clamp] unsigned long or ConstrainULongRange) ConstrainULong;
+
+typedef (double or ConstrainDoubleRange) ConstrainDouble;
+
+typedef (boolean or ConstrainBooleanParameters) ConstrainBoolean;
+
+typedef (DOMString or
+sequence<DOMString> or
+ConstrainDOMStringParameters) ConstrainDOMString;
+
+dictionary DevicePermissionDescriptor : PermissionDescriptor {
+  DOMString deviceId;
+};
+
+dictionary CameraDevicePermissionDescriptor : DevicePermissionDescriptor {
+  boolean panTiltZoom = false;
+};
diff --git a/test/wpt/tests/interfaces/mediacapture-transform.idl b/test/wpt/tests/interfaces/mediacapture-transform.idl
new file mode 100644
index 00000000000..5b2c8fa67a6
--- /dev/null
+++ b/test/wpt/tests/interfaces/mediacapture-transform.idl
@@ -0,0 +1,23 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: MediaStreamTrack Insertable Media Processing using Streams (https://w3c.github.io/mediacapture-transform/)
+
+[Exposed=DedicatedWorker]
+interface MediaStreamTrackProcessor {
+    constructor(MediaStreamTrackProcessorInit init);
+    attribute ReadableStream readable;
+};
+
+dictionary MediaStreamTrackProcessorInit {
+  required MediaStreamTrack track;
+  [EnforceRange] unsigned short maxBufferSize;
+};
+
+[Exposed=DedicatedWorker]
+interface VideoTrackGenerator {
+  constructor();
+  readonly attribute WritableStream writable;
+  attribute boolean muted;
+  readonly attribute MediaStreamTrack track;
+};
diff --git a/test/wpt/tests/interfaces/mediacapture-viewport.idl b/test/wpt/tests/interfaces/mediacapture-viewport.idl
new file mode 100644
index 00000000000..a9dcf74e17c
--- /dev/null
+++ b/test/wpt/tests/interfaces/mediacapture-viewport.idl
@@ -0,0 +1,14 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Viewport Capture (https://w3c.github.io/mediacapture-viewport/)
+
+partial interface MediaDevices {
+  Promise<MediaStream> getViewportMedia(
+      optional ViewportMediaStreamConstraints constraints = {});
+};
+
+dictionary ViewportMediaStreamConstraints {
+  (boolean or MediaTrackConstraints) video = true;
+  (boolean or MediaTrackConstraints) audio = false;
+};
diff --git a/test/wpt/tests/interfaces/mediasession.idl b/test/wpt/tests/interfaces/mediasession.idl
new file mode 100644
index 00000000000..cca46ac5a85
--- /dev/null
+++ b/test/wpt/tests/interfaces/mediasession.idl
@@ -0,0 +1,84 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Media Session Standard (https://w3c.github.io/mediasession/)
+
+[Exposed=Window]
+partial interface Navigator {
+  [SameObject] readonly attribute MediaSession mediaSession;
+};
+
+enum MediaSessionPlaybackState {
+  "none",
+  "paused",
+  "playing"
+};
+
+enum MediaSessionAction {
+  "play",
+  "pause",
+  "seekbackward",
+  "seekforward",
+  "previoustrack",
+  "nexttrack",
+  "skipad",
+  "stop",
+  "seekto",
+  "togglemicrophone",
+  "togglecamera",
+  "hangup",
+  "previousslide",
+  "nextslide"
+};
+
+callback MediaSessionActionHandler = undefined(MediaSessionActionDetails details);
+
+[Exposed=Window]
+interface MediaSession {
+  attribute MediaMetadata? metadata;
+
+  attribute MediaSessionPlaybackState playbackState;
+
+  undefined setActionHandler(MediaSessionAction action, MediaSessionActionHandler? handler);
+
+  undefined setPositionState(optional MediaPositionState state = {});
+
+  undefined setMicrophoneActive(boolean active);
+
+  undefined setCameraActive(boolean active);
+};
+
+[Exposed=Window]
+interface MediaMetadata {
+  constructor(optional MediaMetadataInit init = {});
+  attribute DOMString title;
+  attribute DOMString artist;
+  attribute DOMString album;
+  attribute FrozenArray<MediaImage> artwork;
+};
+
+dictionary MediaMetadataInit {
+  DOMString title = "";
+  DOMString artist = "";
+  DOMString album = "";
+  sequence<MediaImage> artwork = [];
+};
+
+dictionary MediaImage {
+  required USVString src;
+  DOMString sizes = "";
+  DOMString type = "";
+};
+
+dictionary MediaPositionState {
+  double duration;
+  double playbackRate;
+  double position;
+};
+
+dictionary MediaSessionActionDetails {
+  required MediaSessionAction action;
+  double seekOffset;
+  double seekTime;
+  boolean fastSeek;
+};
diff --git a/test/wpt/tests/interfaces/mediastream-recording.idl b/test/wpt/tests/interfaces/mediastream-recording.idl
new file mode 100644
index 00000000000..99f30282333
--- /dev/null
+++ b/test/wpt/tests/interfaces/mediastream-recording.idl
@@ -0,0 +1,60 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: MediaStream Recording (https://w3c.github.io/mediacapture-record/)
+
+[Exposed=Window]
+interface MediaRecorder : EventTarget {
+  constructor(MediaStream stream, optional MediaRecorderOptions options = {});
+  readonly attribute MediaStream stream;
+  readonly attribute DOMString mimeType;
+  readonly attribute RecordingState state;
+  attribute EventHandler onstart;
+  attribute EventHandler onstop;
+  attribute EventHandler ondataavailable;
+  attribute EventHandler onpause;
+  attribute EventHandler onresume;
+  attribute EventHandler onerror;
+  readonly attribute unsigned long videoBitsPerSecond;
+  readonly attribute unsigned long audioBitsPerSecond;
+  readonly attribute BitrateMode audioBitrateMode;
+
+  undefined start(optional unsigned long timeslice);
+  undefined stop();
+  undefined pause();
+  undefined resume();
+  undefined requestData();
+
+  static boolean isTypeSupported(DOMString type);
+};
+
+dictionary MediaRecorderOptions {
+  DOMString mimeType = "";
+  unsigned long audioBitsPerSecond;
+  unsigned long videoBitsPerSecond;
+  unsigned long bitsPerSecond;
+  BitrateMode audioBitrateMode = "variable";
+};
+
+enum BitrateMode {
+  "constant",
+  "variable"
+};
+
+enum RecordingState {
+  "inactive",
+  "recording",
+  "paused"
+};
+
+[Exposed=Window]
+interface BlobEvent : Event {
+  constructor(DOMString type, BlobEventInit eventInitDict);
+  [SameObject] readonly attribute Blob data;
+  readonly attribute DOMHighResTimeStamp timecode;
+};
+
+dictionary BlobEventInit {
+  required Blob data;
+  DOMHighResTimeStamp timecode;
+};
diff --git a/test/wpt/tests/interfaces/model-element.idl b/test/wpt/tests/interfaces/model-element.idl
new file mode 100644
index 00000000000..aa031a16901
--- /dev/null
+++ b/test/wpt/tests/interfaces/model-element.idl
@@ -0,0 +1,9 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: The <model> element (https://immersive-web.github.io/model-element/)
+
+[Exposed=Window]
+interface HTMLModelElement : HTMLElement {
+
+};
diff --git a/test/wpt/tests/interfaces/mst-content-hint.idl b/test/wpt/tests/interfaces/mst-content-hint.idl
new file mode 100644
index 00000000000..a41abb55eae
--- /dev/null
+++ b/test/wpt/tests/interfaces/mst-content-hint.idl
@@ -0,0 +1,18 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: MediaStreamTrack Content Hints (https://w3c.github.io/mst-content-hint/)
+
+partial interface MediaStreamTrack {
+  attribute DOMString contentHint;
+};
+
+enum RTCDegradationPreference {
+  "maintain-framerate",
+  "maintain-resolution",
+  "balanced"
+};
+
+partial dictionary RTCRtpSendParameters {
+ RTCDegradationPreference degradationPreference;
+};
diff --git a/test/wpt/tests/interfaces/navigation-api.idl b/test/wpt/tests/interfaces/navigation-api.idl
new file mode 100644
index 00000000000..11178518292
--- /dev/null
+++ b/test/wpt/tests/interfaces/navigation-api.idl
@@ -0,0 +1,158 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Navigation API (https://wicg.github.io/navigation-api/)
+
+partial interface Window {
+  [Replaceable] readonly attribute Navigation navigation;
+};
+
+[Exposed=Window]
+interface Navigation : EventTarget {
+  sequence<NavigationHistoryEntry> entries();
+  readonly attribute NavigationHistoryEntry? currentEntry;
+  undefined updateCurrentEntry(NavigationUpdateCurrentEntryOptions options);
+  readonly attribute NavigationTransition? transition;
+
+  readonly attribute boolean canGoBack;
+  readonly attribute boolean canGoForward;
+
+  NavigationResult navigate(USVString url, optional NavigationNavigateOptions options = {});
+  NavigationResult reload(optional NavigationReloadOptions options = {});
+
+  NavigationResult traverseTo(DOMString key, optional NavigationOptions options = {});
+  NavigationResult back(optional NavigationOptions options = {});
+  NavigationResult forward(optional NavigationOptions options = {});
+
+  attribute EventHandler onnavigate;
+  attribute EventHandler onnavigatesuccess;
+  attribute EventHandler onnavigateerror;
+  attribute EventHandler oncurrententrychange;
+};
+
+dictionary NavigationUpdateCurrentEntryOptions {
+  required any state;
+};
+
+dictionary NavigationOptions {
+  any info;
+};
+
+dictionary NavigationNavigateOptions : NavigationOptions {
+  any state;
+  NavigationHistoryBehavior history = "auto";
+};
+
+dictionary NavigationReloadOptions : NavigationOptions {
+  any state;
+};
+
+dictionary NavigationResult {
+  Promise<NavigationHistoryEntry> committed;
+  Promise<NavigationHistoryEntry> finished;
+};
+
+enum NavigationHistoryBehavior {
+  "auto",
+  "push",
+  "replace"
+};
+
+[Exposed=Window]
+interface NavigationCurrentEntryChangeEvent : Event {
+  constructor(DOMString type, NavigationCurrentEntryChangeEventInit eventInit);
+
+  readonly attribute NavigationType? navigationType;
+  readonly attribute NavigationHistoryEntry from;
+};
+
+dictionary NavigationCurrentEntryChangeEventInit : EventInit {
+  NavigationType? navigationType = null;
+  required NavigationHistoryEntry destination;
+};
+
+[Exposed=Window]
+interface NavigationTransition {
+  readonly attribute NavigationType navigationType;
+  readonly attribute NavigationHistoryEntry from;
+  readonly attribute Promise<undefined> finished;
+};
+
+[Exposed=Window]
+interface NavigateEvent : Event {
+  constructor(DOMString type, NavigateEventInit eventInit);
+
+  readonly attribute NavigationType navigationType;
+  readonly attribute NavigationDestination destination;
+  readonly attribute boolean canIntercept;
+  readonly attribute boolean userInitiated;
+  readonly attribute boolean hashChange;
+  readonly attribute AbortSignal signal;
+  readonly attribute FormData? formData;
+  readonly attribute DOMString? downloadRequest;
+  readonly attribute any info;
+
+  undefined intercept(optional NavigationInterceptOptions options = {});
+  undefined scroll();
+};
+
+dictionary NavigateEventInit : EventInit {
+  NavigationType navigationType = "push";
+  required NavigationDestination destination;
+  boolean canIntercept = false;
+  boolean userInitiated = false;
+  boolean hashChange = false;
+  required AbortSignal signal;
+  FormData? formData = null;
+  DOMString? downloadRequest = null;
+  any info;
+};
+
+dictionary NavigationInterceptOptions {
+  NavigationInterceptHandler handler;
+  NavigationFocusReset focusReset;
+  NavigationScrollBehavior scroll;
+};
+
+enum NavigationFocusReset {
+  "after-transition",
+  "manual"
+};
+
+enum NavigationScrollBehavior {
+  "after-transition",
+  "manual"
+};
+
+callback NavigationInterceptHandler = Promise<undefined> ();
+
+enum NavigationType {
+  "reload",
+  "push",
+  "replace",
+  "traverse"
+};
+
+[Exposed=Window]
+interface NavigationDestination {
+  readonly attribute USVString url;
+  readonly attribute DOMString? key;
+  readonly attribute DOMString? id;
+  readonly attribute long long index;
+  readonly attribute boolean sameDocument;
+
+  any getState();
+};
+
+[Exposed=Window]
+interface NavigationHistoryEntry : EventTarget {
+  readonly attribute USVString? url;
+  readonly attribute DOMString key;
+  readonly attribute DOMString id;
+  readonly attribute long long index;
+  readonly attribute boolean sameDocument;
+
+  any getState();
+
+  attribute EventHandler ondispose;
+};
diff --git a/test/wpt/tests/interfaces/navigation-timing.idl b/test/wpt/tests/interfaces/navigation-timing.idl
new file mode 100644
index 00000000000..5a33964f07e
--- /dev/null
+++ b/test/wpt/tests/interfaces/navigation-timing.idl
@@ -0,0 +1,71 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Navigation Timing Level 2 (https://w3c.github.io/navigation-timing/)
+
+[Exposed=Window]
+interface PerformanceNavigationTiming : PerformanceResourceTiming {
+    readonly        attribute DOMHighResTimeStamp  unloadEventStart;
+    readonly        attribute DOMHighResTimeStamp  unloadEventEnd;
+    readonly        attribute DOMHighResTimeStamp  domInteractive;
+    readonly        attribute DOMHighResTimeStamp  domContentLoadedEventStart;
+    readonly        attribute DOMHighResTimeStamp  domContentLoadedEventEnd;
+    readonly        attribute DOMHighResTimeStamp  domComplete;
+    readonly        attribute DOMHighResTimeStamp  loadEventStart;
+    readonly        attribute DOMHighResTimeStamp  loadEventEnd;
+    readonly        attribute NavigationTimingType type;
+    readonly        attribute unsigned short       redirectCount;
+    [Default] object toJSON();
+};
+
+enum NavigationTimingType {
+    "navigate",
+    "reload",
+    "back_forward",
+    "prerender"
+};
+
+[Exposed=Window]
+interface PerformanceTiming {
+  readonly attribute unsigned long long navigationStart;
+  readonly attribute unsigned long long unloadEventStart;
+  readonly attribute unsigned long long unloadEventEnd;
+  readonly attribute unsigned long long redirectStart;
+  readonly attribute unsigned long long redirectEnd;
+  readonly attribute unsigned long long fetchStart;
+  readonly attribute unsigned long long domainLookupStart;
+  readonly attribute unsigned long long domainLookupEnd;
+  readonly attribute unsigned long long connectStart;
+  readonly attribute unsigned long long connectEnd;
+  readonly attribute unsigned long long secureConnectionStart;
+  readonly attribute unsigned long long requestStart;
+  readonly attribute unsigned long long responseStart;
+  readonly attribute unsigned long long responseEnd;
+  readonly attribute unsigned long long domLoading;
+  readonly attribute unsigned long long domInteractive;
+  readonly attribute unsigned long long domContentLoadedEventStart;
+  readonly attribute unsigned long long domContentLoadedEventEnd;
+  readonly attribute unsigned long long domComplete;
+  readonly attribute unsigned long long loadEventStart;
+  readonly attribute unsigned long long loadEventEnd;
+  [Default] object toJSON();
+};
+
+[Exposed=Window]
+interface PerformanceNavigation {
+  const unsigned short TYPE_NAVIGATE = 0;
+  const unsigned short TYPE_RELOAD = 1;
+  const unsigned short TYPE_BACK_FORWARD = 2;
+  const unsigned short TYPE_RESERVED = 255;
+  readonly attribute unsigned short type;
+  readonly attribute unsigned short redirectCount;
+  [Default] object toJSON();
+};
+
+[Exposed=Window]
+partial interface Performance {
+  [SameObject]
+  readonly attribute PerformanceTiming timing;
+  [SameObject]
+  readonly attribute PerformanceNavigation navigation;
+};
diff --git a/test/wpt/tests/interfaces/netinfo.idl b/test/wpt/tests/interfaces/netinfo.idl
new file mode 100644
index 00000000000..ac5265dbebc
--- /dev/null
+++ b/test/wpt/tests/interfaces/netinfo.idl
@@ -0,0 +1,43 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Network Information API (https://wicg.github.io/netinfo/)
+
+enum ConnectionType {
+  "bluetooth",
+  "cellular",
+  "ethernet",
+  "mixed",
+  "none",
+  "other",
+  "unknown",
+  "wifi",
+  "wimax"
+};
+
+enum EffectiveConnectionType {
+  "2g",
+  "3g",
+  "4g",
+  "slow-2g"
+};
+
+interface mixin NavigatorNetworkInformation {
+  [SameObject] readonly attribute NetworkInformation connection;
+};
+
+Navigator includes NavigatorNetworkInformation;
+WorkerNavigator includes NavigatorNetworkInformation;
+
+[Exposed=(Window,Worker)]
+interface NetworkInformation : EventTarget {
+  readonly attribute ConnectionType type;
+  readonly attribute EffectiveConnectionType effectiveType;
+  readonly attribute Megabit downlinkMax;
+  readonly attribute Megabit downlink;
+  readonly attribute Millisecond rtt;
+  attribute EventHandler onchange;
+};
+
+typedef unrestricted double Megabit;
+typedef unsigned long long Millisecond;
diff --git a/test/wpt/tests/interfaces/notifications.idl b/test/wpt/tests/interfaces/notifications.idl
new file mode 100644
index 00000000000..2be22213d78
--- /dev/null
+++ b/test/wpt/tests/interfaces/notifications.idl
@@ -0,0 +1,101 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Notifications API Standard (https://notifications.spec.whatwg.org/)
+
+[Exposed=(Window,Worker)]
+interface Notification : EventTarget {
+  constructor(DOMString title, optional NotificationOptions options = {});
+
+  static readonly attribute NotificationPermission permission;
+  [Exposed=Window] static Promise<NotificationPermission> requestPermission(optional NotificationPermissionCallback deprecatedCallback);
+
+  static readonly attribute unsigned long maxActions;
+
+  attribute EventHandler onclick;
+  attribute EventHandler onshow;
+  attribute EventHandler onerror;
+  attribute EventHandler onclose;
+
+  readonly attribute DOMString title;
+  readonly attribute NotificationDirection dir;
+  readonly attribute DOMString lang;
+  readonly attribute DOMString body;
+  readonly attribute DOMString tag;
+  readonly attribute USVString image;
+  readonly attribute USVString icon;
+  readonly attribute USVString badge;
+  [SameObject] readonly attribute FrozenArray<unsigned long> vibrate;
+  readonly attribute EpochTimeStamp timestamp;
+  readonly attribute boolean renotify;
+  readonly attribute boolean silent;
+  readonly attribute boolean requireInteraction;
+  [SameObject] readonly attribute any data;
+  [SameObject] readonly attribute FrozenArray<NotificationAction> actions;
+
+  undefined close();
+};
+
+dictionary NotificationOptions {
+  NotificationDirection dir = "auto";
+  DOMString lang = "";
+  DOMString body = "";
+  DOMString tag = "";
+  USVString image;
+  USVString icon;
+  USVString badge;
+  VibratePattern vibrate;
+  EpochTimeStamp timestamp;
+  boolean renotify = false;
+  boolean silent = false;
+  boolean requireInteraction = false;
+  any data = null;
+  sequence<NotificationAction> actions = [];
+};
+
+enum NotificationPermission {
+  "default",
+  "denied",
+  "granted"
+};
+
+enum NotificationDirection {
+  "auto",
+  "ltr",
+  "rtl"
+};
+
+dictionary NotificationAction {
+  required DOMString action;
+  required DOMString title;
+  USVString icon;
+};
+
+callback NotificationPermissionCallback = undefined (NotificationPermission permission);
+
+dictionary GetNotificationOptions {
+  DOMString tag = "";
+};
+
+partial interface ServiceWorkerRegistration {
+  Promise<undefined> showNotification(DOMString title, optional NotificationOptions options = {});
+  Promise<sequence<Notification>> getNotifications(optional GetNotificationOptions filter = {});
+};
+
+[Exposed=ServiceWorker]
+interface NotificationEvent : ExtendableEvent {
+  constructor(DOMString type, NotificationEventInit eventInitDict);
+
+  readonly attribute Notification notification;
+  readonly attribute DOMString action;
+};
+
+dictionary NotificationEventInit : ExtendableEventInit {
+  required Notification notification;
+  DOMString action = "";
+};
+
+partial interface ServiceWorkerGlobalScope {
+  attribute EventHandler onnotificationclick;
+  attribute EventHandler onnotificationclose;
+};
diff --git a/test/wpt/tests/interfaces/orientation-event.idl b/test/wpt/tests/interfaces/orientation-event.idl
new file mode 100644
index 00000000000..f6ff96f0e01
--- /dev/null
+++ b/test/wpt/tests/interfaces/orientation-event.idl
@@ -0,0 +1,82 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: DeviceOrientation Event Specification (https://w3c.github.io/deviceorientation/)
+
+partial interface Window {
+    [SecureContext] attribute EventHandler ondeviceorientation;
+};
+
+[Exposed=Window, SecureContext]
+interface DeviceOrientationEvent : Event {
+    constructor(DOMString type, optional DeviceOrientationEventInit eventInitDict = {});
+    readonly attribute double? alpha;
+    readonly attribute double? beta;
+    readonly attribute double? gamma;
+    readonly attribute boolean absolute;
+
+    static Promise<PermissionState> requestPermission();
+};
+
+dictionary DeviceOrientationEventInit : EventInit {
+    double? alpha = null;
+    double? beta = null;
+    double? gamma = null;
+    boolean absolute = false;
+};
+
+partial interface Window {
+    [SecureContext] attribute EventHandler ondeviceorientationabsolute;
+};
+
+partial interface Window {
+    attribute EventHandler oncompassneedscalibration;
+};
+
+partial interface Window {
+    [SecureContext] attribute EventHandler ondevicemotion;
+};
+
+[Exposed=Window, SecureContext]
+interface DeviceMotionEventAcceleration {
+    readonly attribute double? x;
+    readonly attribute double? y;
+    readonly attribute double? z;
+};
+
+[Exposed=Window, SecureContext]
+interface DeviceMotionEventRotationRate {
+    readonly attribute double? alpha;
+    readonly attribute double? beta;
+    readonly attribute double? gamma;
+};
+
+[Exposed=Window, SecureContext]
+interface DeviceMotionEvent : Event {
+    constructor(DOMString type, optional DeviceMotionEventInit eventInitDict = {});
+    readonly attribute DeviceMotionEventAcceleration? acceleration;
+    readonly attribute DeviceMotionEventAcceleration? accelerationIncludingGravity;
+    readonly attribute DeviceMotionEventRotationRate? rotationRate;
+    readonly attribute double interval;
+
+    static Promise<PermissionState> requestPermission();
+};
+
+dictionary DeviceMotionEventAccelerationInit {
+    double? x = null;
+    double? y = null;
+    double? z = null;
+};
+
+dictionary DeviceMotionEventRotationRateInit {
+    double? alpha = null;
+    double? beta = null;
+    double? gamma = null;
+};
+
+dictionary DeviceMotionEventInit : EventInit {
+    DeviceMotionEventAccelerationInit acceleration;
+    DeviceMotionEventAccelerationInit accelerationIncludingGravity;
+    DeviceMotionEventRotationRateInit rotationRate;
+    double interval = 0;
+};
diff --git a/test/wpt/tests/interfaces/orientation-sensor.idl b/test/wpt/tests/interfaces/orientation-sensor.idl
new file mode 100644
index 00000000000..5172c87cd4e
--- /dev/null
+++ b/test/wpt/tests/interfaces/orientation-sensor.idl
@@ -0,0 +1,35 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Orientation Sensor (https://w3c.github.io/orientation-sensor/)
+
+typedef (Float32Array or Float64Array or DOMMatrix) RotationMatrixType;
+
+[SecureContext, Exposed=Window]
+interface OrientationSensor : Sensor {
+  readonly attribute FrozenArray<double>? quaternion;
+  undefined populateMatrix(RotationMatrixType targetMatrix);
+};
+
+enum OrientationSensorLocalCoordinateSystem { "device", "screen" };
+
+dictionary OrientationSensorOptions : SensorOptions {
+  OrientationSensorLocalCoordinateSystem referenceFrame = "device";
+};
+
+[SecureContext, Exposed=Window]
+interface AbsoluteOrientationSensor : OrientationSensor {
+  constructor(optional OrientationSensorOptions sensorOptions = {});
+};
+
+[SecureContext, Exposed=Window]
+interface RelativeOrientationSensor : OrientationSensor {
+  constructor(optional OrientationSensorOptions sensorOptions = {});
+};
+
+dictionary AbsoluteOrientationReadingValues {
+  required FrozenArray<double>? quaternion;
+};
+
+dictionary RelativeOrientationReadingValues : AbsoluteOrientationReadingValues {
+};
diff --git a/test/wpt/tests/interfaces/page-lifecycle.idl b/test/wpt/tests/interfaces/page-lifecycle.idl
new file mode 100644
index 00000000000..26de11c23d0
--- /dev/null
+++ b/test/wpt/tests/interfaces/page-lifecycle.idl
@@ -0,0 +1,19 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Page Lifecycle (https://wicg.github.io/page-lifecycle/)
+
+partial interface Document {
+    attribute EventHandler onfreeze;
+    attribute EventHandler onresume;
+    readonly attribute boolean wasDiscarded;
+};
+
+partial interface Client {
+    readonly attribute ClientLifecycleState lifecycleState;
+};
+
+enum ClientLifecycleState {
+    "active",
+    "frozen"
+};
diff --git a/test/wpt/tests/interfaces/paint-timing.idl b/test/wpt/tests/interfaces/paint-timing.idl
new file mode 100644
index 00000000000..052b74ef6c2
--- /dev/null
+++ b/test/wpt/tests/interfaces/paint-timing.idl
@@ -0,0 +1,7 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Paint Timing 1 (https://w3c.github.io/paint-timing/)
+
+[Exposed=Window]
+interface PerformancePaintTiming : PerformanceEntry {};
diff --git a/test/wpt/tests/interfaces/parakeet.tentative.idl b/test/wpt/tests/interfaces/parakeet.tentative.idl
new file mode 100644
index 00000000000..a65cb1900c6
--- /dev/null
+++ b/test/wpt/tests/interfaces/parakeet.tentative.idl
@@ -0,0 +1,32 @@
+enum AdSignals {
+  "coarse-geolocation",
+  "coarse-ua",
+  "targeting",
+  "user-ad-interests"
+};
+dictionary AdProperties{
+  DOMString width;
+  DOMString height;
+  DOMString slot;
+  DOMString lang;
+  DOMString adtype;
+  double bidFloor;
+};
+dictionary AdTargeting{
+  sequence<DOMString> interests;
+  GeolocationCoordinates geolocation;
+};
+
+dictionary AdRequestConfig{
+  required USVString adRequestUrl;
+  required(AdProperties or sequence<AdProperties>) adProperties;
+  DOMString publisherCode;
+  AdTargeting targeting;
+  sequence<AdSignals> anonymizedProxiedSignals;
+  USVString fallbackSource;
+};
+
+partial interface Navigator {
+  Promise<Ads> createAdRequest(AdRequestConfig config);
+  Promise<URL> finalizeAd(Ads ads, AuctionAdConfig config);
+};
diff --git a/test/wpt/tests/interfaces/payment-handler.idl b/test/wpt/tests/interfaces/payment-handler.idl
new file mode 100644
index 00000000000..91c01297f40
--- /dev/null
+++ b/test/wpt/tests/interfaces/payment-handler.idl
@@ -0,0 +1,131 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Payment Handler API (https://w3c.github.io/payment-handler/)
+
+partial interface ServiceWorkerRegistration {
+  [SameObject] readonly attribute PaymentManager paymentManager;
+};
+
+[SecureContext, Exposed=(Window)]
+interface PaymentManager {
+  attribute DOMString userHint;
+  Promise<undefined> enableDelegations(sequence<PaymentDelegation> delegations);
+};
+
+enum PaymentDelegation {
+  "shippingAddress",
+  "payerName",
+  "payerPhone",
+  "payerEmail"
+};
+
+partial interface ServiceWorkerGlobalScope {
+  attribute EventHandler oncanmakepayment;
+};
+
+[Exposed=ServiceWorker]
+interface CanMakePaymentEvent : ExtendableEvent {
+  constructor(DOMString type);
+  undefined respondWith(Promise<boolean> canMakePaymentResponse);
+};
+
+partial interface ServiceWorkerGlobalScope {
+  attribute EventHandler onpaymentrequest;
+};
+
+dictionary PaymentRequestDetailsUpdate {
+  DOMString error;
+  PaymentCurrencyAmount total;
+  sequence<PaymentDetailsModifier> modifiers;
+  sequence<PaymentShippingOption> shippingOptions;
+  object paymentMethodErrors;
+  AddressErrors shippingAddressErrors;
+};
+
+[Exposed=ServiceWorker]
+interface PaymentRequestEvent : ExtendableEvent {
+  constructor(DOMString type, optional PaymentRequestEventInit eventInitDict = {});
+  readonly attribute USVString topOrigin;
+  readonly attribute USVString paymentRequestOrigin;
+  readonly attribute DOMString paymentRequestId;
+  readonly attribute FrozenArray<PaymentMethodData> methodData;
+  readonly attribute object total;
+  readonly attribute FrozenArray<PaymentDetailsModifier> modifiers;
+  readonly attribute object? paymentOptions;
+  readonly attribute FrozenArray<PaymentShippingOption>? shippingOptions;
+  Promise<WindowClient?> openWindow(USVString url);
+  Promise<PaymentRequestDetailsUpdate?> changePaymentMethod(DOMString methodName, optional object? methodDetails = null);
+  Promise<PaymentRequestDetailsUpdate?> changeShippingAddress(optional AddressInit shippingAddress = {});
+  Promise<PaymentRequestDetailsUpdate?> changeShippingOption(DOMString shippingOption);
+  undefined respondWith(Promise<PaymentHandlerResponse> handlerResponsePromise);
+};
+
+dictionary PaymentRequestEventInit : ExtendableEventInit {
+  USVString topOrigin;
+  USVString paymentRequestOrigin;
+  DOMString paymentRequestId;
+  sequence<PaymentMethodData> methodData;
+  PaymentCurrencyAmount total;
+  sequence<PaymentDetailsModifier> modifiers;
+  PaymentOptions paymentOptions;
+  sequence<PaymentShippingOption> shippingOptions;
+};
+
+dictionary PaymentHandlerResponse {
+DOMString methodName;
+object details;
+DOMString? payerName;
+DOMString? payerEmail;
+DOMString? payerPhone;
+AddressInit shippingAddress;
+DOMString? shippingOption;
+};
+
+dictionary AddressInit {
+  DOMString country = "";
+  sequence<DOMString> addressLine = [];
+  DOMString region = "";
+  DOMString city = "";
+  DOMString dependentLocality = "";
+  DOMString postalCode = "";
+  DOMString sortingCode = "";
+  DOMString organization = "";
+  DOMString recipient = "";
+  DOMString phone = "";
+};
+
+dictionary PaymentOptions {
+  boolean requestPayerName = false;
+  boolean requestBillingAddress = false;
+  boolean requestPayerEmail = false;
+  boolean requestPayerPhone = false;
+  boolean requestShipping = false;
+  PaymentShippingType shippingType = "shipping";
+};
+
+dictionary PaymentShippingOption {
+  required DOMString id;
+  required DOMString label;
+  required PaymentCurrencyAmount amount;
+  boolean selected = false;
+};
+
+enum PaymentShippingType {
+  "shipping",
+  "delivery",
+  "pickup"
+};
+
+dictionary AddressErrors {
+  DOMString addressLine;
+  DOMString city;
+  DOMString country;
+  DOMString dependentLocality;
+  DOMString organization;
+  DOMString phone;
+  DOMString postalCode;
+  DOMString recipient;
+  DOMString region;
+  DOMString sortingCode;
+};
diff --git a/test/wpt/tests/interfaces/payment-request.idl b/test/wpt/tests/interfaces/payment-request.idl
new file mode 100644
index 00000000000..0a97d4d75c1
--- /dev/null
+++ b/test/wpt/tests/interfaces/payment-request.idl
@@ -0,0 +1,112 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Payment Request API 1.1 (https://w3c.github.io/payment-request/)
+
+[SecureContext, Exposed=Window]
+interface PaymentRequest : EventTarget {
+  constructor(
+    sequence<PaymentMethodData> methodData,
+    PaymentDetailsInit details
+  );
+  [NewObject]
+  Promise<PaymentResponse> show(optional Promise<PaymentDetailsUpdate> detailsPromise);
+  [NewObject]
+  Promise<undefined> abort();
+  [NewObject]
+  Promise<boolean> canMakePayment();
+
+  readonly attribute DOMString id;
+
+  attribute EventHandler onpaymentmethodchange;
+};
+
+dictionary PaymentMethodData {
+  required DOMString supportedMethods;
+  object data;
+};
+
+dictionary PaymentCurrencyAmount {
+  required DOMString currency;
+  required DOMString value;
+};
+
+dictionary PaymentDetailsBase {
+  sequence<PaymentItem> displayItems;
+  sequence<PaymentDetailsModifier> modifiers;
+};
+
+dictionary PaymentDetailsInit : PaymentDetailsBase {
+  DOMString id;
+  required PaymentItem total;
+};
+
+dictionary PaymentDetailsUpdate : PaymentDetailsBase {
+  PaymentItem total;
+  object paymentMethodErrors;
+};
+
+dictionary PaymentDetailsModifier {
+  required DOMString supportedMethods;
+  PaymentItem total;
+  sequence<PaymentItem> additionalDisplayItems;
+  object data;
+};
+
+dictionary PaymentItem {
+  required DOMString label;
+  required PaymentCurrencyAmount amount;
+  boolean pending = false;
+};
+
+dictionary PaymentCompleteDetails {
+  object? data = null;
+};
+
+enum PaymentComplete {
+  "fail",
+  "success",
+  "unknown"
+};
+
+[SecureContext, Exposed=Window]
+interface PaymentResponse : EventTarget  {
+  [Default] object toJSON();
+
+  readonly attribute DOMString requestId;
+  readonly attribute DOMString methodName;
+  readonly attribute object details;
+
+  [NewObject]
+  Promise<undefined> complete(
+    optional PaymentComplete result = "unknown",
+    optional PaymentCompleteDetails details = {}
+  );
+  [NewObject]
+  Promise<undefined> retry(optional PaymentValidationErrors errorFields = {});
+};
+
+dictionary PaymentValidationErrors {
+  DOMString error;
+  object paymentMethod;
+};
+
+[SecureContext, Exposed=Window]
+interface PaymentMethodChangeEvent : PaymentRequestUpdateEvent {
+  constructor(DOMString type, optional PaymentMethodChangeEventInit eventInitDict = {});
+  readonly attribute DOMString methodName;
+  readonly attribute object? methodDetails;
+};
+
+dictionary PaymentMethodChangeEventInit : PaymentRequestUpdateEventInit {
+  DOMString methodName = "";
+  object? methodDetails = null;
+};
+
+[SecureContext, Exposed=Window]
+interface PaymentRequestUpdateEvent : Event {
+  constructor(DOMString type, optional PaymentRequestUpdateEventInit eventInitDict = {});
+  undefined updateWith(Promise<PaymentDetailsUpdate> detailsPromise);
+};
+
+dictionary PaymentRequestUpdateEventInit : EventInit {};
diff --git a/test/wpt/tests/interfaces/performance-measure-memory.idl b/test/wpt/tests/interfaces/performance-measure-memory.idl
new file mode 100644
index 00000000000..b60f2b688cc
--- /dev/null
+++ b/test/wpt/tests/interfaces/performance-measure-memory.idl
@@ -0,0 +1,30 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Measure Memory API (https://wicg.github.io/performance-measure-memory/)
+
+dictionary MemoryMeasurement {
+  unsigned long long bytes;
+  sequence<MemoryBreakdownEntry> breakdown;
+};
+
+dictionary MemoryBreakdownEntry {
+  unsigned long long bytes;
+  sequence<MemoryAttribution> attribution;
+  sequence<DOMString> types;
+};
+
+dictionary MemoryAttribution {
+  USVString url;
+  MemoryAttributionContainer container;
+  DOMString scope;
+};
+
+dictionary MemoryAttributionContainer {
+  DOMString id;
+  USVString src;
+};
+
+partial interface Performance {
+  [Exposed=(Window,ServiceWorker,SharedWorker), CrossOriginIsolated] Promise<MemoryMeasurement> measureUserAgentSpecificMemory();
+};
diff --git a/test/wpt/tests/interfaces/performance-timeline.idl b/test/wpt/tests/interfaces/performance-timeline.idl
new file mode 100644
index 00000000000..cdd8fafd8c6
--- /dev/null
+++ b/test/wpt/tests/interfaces/performance-timeline.idl
@@ -0,0 +1,49 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Performance Timeline (https://w3c.github.io/performance-timeline/)
+
+partial interface Performance {
+  PerformanceEntryList getEntries ();
+  PerformanceEntryList getEntriesByType (DOMString type);
+  PerformanceEntryList getEntriesByName (DOMString name, optional DOMString type);
+};
+typedef sequence<PerformanceEntry> PerformanceEntryList;
+
+[Exposed=(Window,Worker)]
+interface PerformanceEntry {
+  readonly    attribute DOMString           name;
+  readonly    attribute DOMString           entryType;
+  readonly    attribute DOMHighResTimeStamp startTime;
+  readonly    attribute DOMHighResTimeStamp duration;
+  [Default] object toJSON();
+};
+
+callback PerformanceObserverCallback = undefined (PerformanceObserverEntryList entries,
+                                             PerformanceObserver observer,
+                                             optional PerformanceObserverCallbackOptions options = {});
+[Exposed=(Window,Worker)]
+interface PerformanceObserver {
+  constructor(PerformanceObserverCallback callback);
+  undefined observe (optional PerformanceObserverInit options = {});
+  undefined disconnect ();
+  PerformanceEntryList takeRecords();
+  [SameObject] static readonly attribute FrozenArray<DOMString> supportedEntryTypes;
+};
+
+dictionary PerformanceObserverCallbackOptions {
+  unsigned long long droppedEntriesCount;
+};
+
+dictionary PerformanceObserverInit {
+  sequence<DOMString> entryTypes;
+  DOMString type;
+  boolean buffered;
+};
+
+[Exposed=(Window,Worker)]
+interface PerformanceObserverEntryList {
+  PerformanceEntryList getEntries();
+  PerformanceEntryList getEntriesByType (DOMString type);
+  PerformanceEntryList getEntriesByName (DOMString name, optional DOMString type);
+};
diff --git a/test/wpt/tests/interfaces/periodic-background-sync.idl b/test/wpt/tests/interfaces/periodic-background-sync.idl
new file mode 100644
index 00000000000..d61ebe9b8c4
--- /dev/null
+++ b/test/wpt/tests/interfaces/periodic-background-sync.idl
@@ -0,0 +1,34 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Web Periodic Background Synchronization (https://wicg.github.io/periodic-background-sync/)
+
+partial interface ServiceWorkerGlobalScope {
+    attribute EventHandler onperiodicsync;
+};
+
+[Exposed=(Window,Worker)]
+partial interface ServiceWorkerRegistration {
+  readonly attribute PeriodicSyncManager periodicSync;
+};
+
+[Exposed=(Window,Worker)]
+interface PeriodicSyncManager {
+    Promise<undefined> register(DOMString tag, optional BackgroundSyncOptions options = {});
+    Promise<sequence<DOMString>> getTags();
+    Promise<undefined> unregister(DOMString tag);
+};
+
+dictionary BackgroundSyncOptions {
+    [EnforceRange] unsigned long long minInterval = 0;
+};
+
+dictionary PeriodicSyncEventInit : ExtendableEventInit {
+    required DOMString tag;
+};
+
+[Exposed=ServiceWorker]
+interface PeriodicSyncEvent : ExtendableEvent {
+    constructor(DOMString type, PeriodicSyncEventInit init);
+    readonly attribute DOMString tag;
+};
diff --git a/test/wpt/tests/interfaces/permissions-policy.idl b/test/wpt/tests/interfaces/permissions-policy.idl
new file mode 100644
index 00000000000..16945e3a9b7
--- /dev/null
+++ b/test/wpt/tests/interfaces/permissions-policy.idl
@@ -0,0 +1,29 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Permissions Policy (https://w3c.github.io/webappsec-permissions-policy/)
+
+[Exposed=Window]
+interface PermissionsPolicy {
+  boolean allowsFeature(DOMString feature, optional DOMString origin);
+  sequence<DOMString> features();
+  sequence<DOMString> allowedFeatures();
+  sequence<DOMString> getAllowlistForFeature(DOMString feature);
+};
+
+partial interface Document {
+    [SameObject] readonly attribute PermissionsPolicy permissionsPolicy;
+};
+
+partial interface HTMLIFrameElement {
+    [SameObject] readonly attribute PermissionsPolicy permissionsPolicy;
+};
+
+[Exposed=Window]
+interface PermissionsPolicyViolationReportBody : ReportBody {
+  readonly attribute DOMString featureId;
+  readonly attribute DOMString? sourceFile;
+  readonly attribute long? lineNumber;
+  readonly attribute long? columnNumber;
+  readonly attribute DOMString disposition;
+};
diff --git a/test/wpt/tests/interfaces/permissions-request.idl b/test/wpt/tests/interfaces/permissions-request.idl
new file mode 100644
index 00000000000..e189194dd0b
--- /dev/null
+++ b/test/wpt/tests/interfaces/permissions-request.idl
@@ -0,0 +1,8 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Requesting Permissions (https://wicg.github.io/permissions-request/)
+
+partial interface Permissions {
+  Promise<PermissionStatus> request(object permissionDesc);
+};
diff --git a/test/wpt/tests/interfaces/permissions-revoke.idl b/test/wpt/tests/interfaces/permissions-revoke.idl
new file mode 100644
index 00000000000..5e8f386cfbc
--- /dev/null
+++ b/test/wpt/tests/interfaces/permissions-revoke.idl
@@ -0,0 +1,8 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Relinquishing Permissions (https://wicg.github.io/permissions-revoke/)
+
+partial interface Permissions {
+  Promise<PermissionStatus> revoke(object permissionDesc);
+};
diff --git a/test/wpt/tests/interfaces/permissions.idl b/test/wpt/tests/interfaces/permissions.idl
new file mode 100644
index 00000000000..fbcb674e561
--- /dev/null
+++ b/test/wpt/tests/interfaces/permissions.idl
@@ -0,0 +1,41 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Permissions (https://w3c.github.io/permissions/)
+
+[Exposed=(Window)]
+partial interface Navigator {
+  [SameObject] readonly attribute Permissions permissions;
+};
+
+[Exposed=(Worker)]
+partial interface WorkerNavigator {
+  [SameObject] readonly attribute Permissions permissions;
+};
+
+[Exposed=(Window,Worker)]
+interface Permissions {
+  Promise<PermissionStatus> query(object permissionDesc);
+};
+
+dictionary PermissionDescriptor {
+  required DOMString name;
+};
+
+[Exposed=(Window,Worker)]
+interface PermissionStatus : EventTarget {
+  readonly attribute PermissionState state;
+  readonly attribute DOMString name;
+  attribute EventHandler onchange;
+};
+
+enum PermissionState {
+  "granted",
+  "denied",
+  "prompt",
+};
+
+dictionary PermissionSetParameters {
+  required PermissionDescriptor descriptor;
+  required PermissionState state;
+};
diff --git a/test/wpt/tests/interfaces/picture-in-picture.idl b/test/wpt/tests/interfaces/picture-in-picture.idl
new file mode 100644
index 00000000000..516fb59d8d4
--- /dev/null
+++ b/test/wpt/tests/interfaces/picture-in-picture.idl
@@ -0,0 +1,41 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Picture-in-Picture (https://w3c.github.io/picture-in-picture/)
+
+partial interface HTMLVideoElement {
+  [NewObject] Promise<PictureInPictureWindow> requestPictureInPicture();
+
+  attribute EventHandler onenterpictureinpicture;
+  attribute EventHandler onleavepictureinpicture;
+
+  [CEReactions] attribute boolean disablePictureInPicture;
+};
+
+partial interface Document {
+  readonly attribute boolean pictureInPictureEnabled;
+
+  [NewObject] Promise<undefined> exitPictureInPicture();
+};
+
+partial interface mixin DocumentOrShadowRoot {
+  readonly attribute Element? pictureInPictureElement;
+};
+
+[Exposed=Window]
+interface PictureInPictureWindow : EventTarget {
+  readonly attribute long width;
+  readonly attribute long height;
+
+  attribute EventHandler onresize;
+};
+
+[Exposed=Window]
+interface PictureInPictureEvent : Event {
+    constructor(DOMString type, PictureInPictureEventInit eventInitDict);
+    [SameObject] readonly attribute PictureInPictureWindow pictureInPictureWindow;
+};
+
+dictionary PictureInPictureEventInit : EventInit {
+    required PictureInPictureWindow pictureInPictureWindow;
+};
diff --git a/test/wpt/tests/interfaces/pointerevents.idl b/test/wpt/tests/interfaces/pointerevents.idl
new file mode 100644
index 00000000000..4ecb290ed41
--- /dev/null
+++ b/test/wpt/tests/interfaces/pointerevents.idl
@@ -0,0 +1,64 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Pointer Events (https://w3c.github.io/pointerevents/)
+
+dictionary PointerEventInit : MouseEventInit {
+    long        pointerId = 0;
+    double      width = 1;
+    double      height = 1;
+    float       pressure = 0;
+    float       tangentialPressure = 0;
+    long        tiltX;
+    long        tiltY;
+    long        twist = 0;
+    double      altitudeAngle;
+    double      azimuthAngle;
+    DOMString   pointerType = "";
+    boolean     isPrimary = false;
+    sequence<PointerEvent> coalescedEvents = [];
+    sequence<PointerEvent> predictedEvents = [];
+};
+
+[Exposed=Window]
+interface PointerEvent : MouseEvent {
+    constructor(DOMString type, optional PointerEventInit eventInitDict = {});
+    readonly        attribute long        pointerId;
+    readonly        attribute double      width;
+    readonly        attribute double      height;
+    readonly        attribute float       pressure;
+    readonly        attribute float       tangentialPressure;
+    readonly        attribute long        tiltX;
+    readonly        attribute long        tiltY;
+    readonly        attribute long        twist;
+    readonly        attribute double      altitudeAngle;
+    readonly        attribute double      azimuthAngle;
+    readonly        attribute DOMString   pointerType;
+    readonly        attribute boolean     isPrimary;
+    [SecureContext] sequence<PointerEvent> getCoalescedEvents();
+    sequence<PointerEvent> getPredictedEvents();
+};
+
+partial interface Element {
+  undefined setPointerCapture (long pointerId);
+  undefined releasePointerCapture (long pointerId);
+  boolean hasPointerCapture (long pointerId);
+};
+
+partial interface mixin GlobalEventHandlers {
+    attribute EventHandler onpointerover;
+    attribute EventHandler onpointerenter;
+    attribute EventHandler onpointerdown;
+    attribute EventHandler onpointermove;
+    [SecureContext] attribute EventHandler onpointerrawupdate;
+    attribute EventHandler onpointerup;
+    attribute EventHandler onpointercancel;
+    attribute EventHandler onpointerout;
+    attribute EventHandler onpointerleave;
+    attribute EventHandler ongotpointercapture;
+    attribute EventHandler onlostpointercapture;
+};
+
+partial interface Navigator {
+    readonly  attribute long maxTouchPoints;
+};
diff --git a/test/wpt/tests/interfaces/pointerlock.idl b/test/wpt/tests/interfaces/pointerlock.idl
new file mode 100644
index 00000000000..0204bf53424
--- /dev/null
+++ b/test/wpt/tests/interfaces/pointerlock.idl
@@ -0,0 +1,28 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Pointer Lock 2.0 (https://w3c.github.io/pointerlock/)
+
+partial interface Element {
+  undefined requestPointerLock();
+};
+
+partial interface Document {
+  attribute EventHandler onpointerlockchange;
+  attribute EventHandler onpointerlockerror;
+  undefined exitPointerLock();
+};
+
+partial interface mixin DocumentOrShadowRoot {
+  readonly attribute Element ? pointerLockElement;
+};
+
+partial interface MouseEvent {
+  readonly attribute double movementX;
+  readonly attribute double movementY;
+};
+
+partial dictionary MouseEventInit {
+  double movementX = 0;
+  double movementY = 0;
+};
diff --git a/test/wpt/tests/interfaces/portals.idl b/test/wpt/tests/interfaces/portals.idl
new file mode 100644
index 00000000000..5d85cce667b
--- /dev/null
+++ b/test/wpt/tests/interfaces/portals.idl
@@ -0,0 +1,50 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Portals (https://wicg.github.io/portals/)
+
+[Exposed=Window]
+interface HTMLPortalElement : HTMLElement {
+    [HTMLConstructor] constructor();
+
+    [CEReactions] attribute USVString src;
+    [CEReactions] attribute DOMString referrerPolicy;
+
+    [NewObject] Promise<undefined> activate(optional PortalActivateOptions options = {});
+    undefined postMessage(any message, optional StructuredSerializeOptions options = {});
+
+    attribute EventHandler onmessage;
+    attribute EventHandler onmessageerror;
+};
+
+dictionary PortalActivateOptions : StructuredSerializeOptions {
+    any data;
+};
+
+partial interface Window {
+    readonly attribute PortalHost? portalHost;
+};
+
+[Exposed=Window]
+interface PortalHost : EventTarget {
+    undefined postMessage(any message, optional StructuredSerializeOptions options = {});
+
+    attribute EventHandler onmessage;
+    attribute EventHandler onmessageerror;
+};
+
+[Exposed=Window]
+interface PortalActivateEvent : Event {
+    constructor(DOMString type, optional PortalActivateEventInit eventInitDict = {});
+
+    readonly attribute any data;
+    HTMLPortalElement adoptPredecessor();
+};
+
+dictionary PortalActivateEventInit : EventInit {
+    any data = null;
+};
+
+partial interface mixin WindowEventHandlers {
+    attribute EventHandler onportalactivate;
+};
diff --git a/test/wpt/tests/interfaces/prefer-current-tab.idl b/test/wpt/tests/interfaces/prefer-current-tab.idl
new file mode 100644
index 00000000000..86445e539f4
--- /dev/null
+++ b/test/wpt/tests/interfaces/prefer-current-tab.idl
@@ -0,0 +1,8 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: preferCurrentTab (https://wicg.github.io/prefer-current-tab/)
+
+partial dictionary MediaStreamConstraints {
+  boolean preferCurrentTab = false;
+};
diff --git a/test/wpt/tests/interfaces/prerendering-revamped.idl b/test/wpt/tests/interfaces/prerendering-revamped.idl
new file mode 100644
index 00000000000..8f01432618e
--- /dev/null
+++ b/test/wpt/tests/interfaces/prerendering-revamped.idl
@@ -0,0 +1,15 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Prerendering Revamped (https://wicg.github.io/nav-speculation/prerendering.html)
+
+partial interface Document {
+    readonly attribute boolean prerendering;
+
+    // Under "special event handler IDL attributes that only apply to Document objects"
+    attribute EventHandler onprerenderingchange;
+};
+
+partial interface PerformanceNavigationTiming {
+    readonly attribute DOMHighResTimeStamp activationStart;
+};
diff --git a/test/wpt/tests/interfaces/presentation-api.idl b/test/wpt/tests/interfaces/presentation-api.idl
new file mode 100644
index 00000000000..4f1e4bee835
--- /dev/null
+++ b/test/wpt/tests/interfaces/presentation-api.idl
@@ -0,0 +1,95 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Presentation API (https://w3c.github.io/presentation-api/)
+
+partial interface Navigator {
+  [SecureContext, SameObject] readonly attribute Presentation presentation;
+};
+
+[SecureContext, Exposed=Window]
+interface Presentation {
+};
+
+partial interface Presentation {
+  attribute PresentationRequest? defaultRequest;
+};
+
+partial interface Presentation {
+  readonly attribute PresentationReceiver? receiver;
+};
+
+[SecureContext, Exposed=Window]
+interface PresentationRequest : EventTarget {
+  constructor(USVString url);
+  constructor(sequence<USVString> urls);
+  Promise<PresentationConnection> start();
+  Promise<PresentationConnection> reconnect(USVString presentationId);
+  Promise<PresentationAvailability> getAvailability();
+
+  attribute EventHandler onconnectionavailable;
+};
+
+[SecureContext, Exposed=Window]
+interface PresentationAvailability : EventTarget {
+  readonly attribute boolean value;
+
+  attribute EventHandler onchange;
+};
+
+[SecureContext, Exposed=Window]
+interface PresentationConnectionAvailableEvent : Event {
+  constructor(DOMString type, PresentationConnectionAvailableEventInit eventInitDict);
+  [SameObject] readonly attribute PresentationConnection connection;
+};
+
+dictionary PresentationConnectionAvailableEventInit : EventInit {
+  required PresentationConnection connection;
+};
+
+enum PresentationConnectionState { "connecting", "connected", "closed", "terminated" };
+
+[SecureContext, Exposed=Window]
+interface PresentationConnection : EventTarget {
+  readonly attribute USVString id;
+  readonly attribute USVString url;
+  readonly attribute PresentationConnectionState state;
+  undefined close();
+  undefined terminate();
+  attribute EventHandler onconnect;
+  attribute EventHandler onclose;
+  attribute EventHandler onterminate;
+
+  // Communication
+  attribute BinaryType binaryType;
+  attribute EventHandler onmessage;
+  undefined send (DOMString message);
+  undefined send (Blob data);
+  undefined send (ArrayBuffer data);
+  undefined send (ArrayBufferView data);
+};
+
+enum PresentationConnectionCloseReason { "error", "closed", "wentaway" };
+
+[SecureContext, Exposed=Window]
+interface PresentationConnectionCloseEvent : Event {
+  constructor(DOMString type, PresentationConnectionCloseEventInit eventInitDict);
+  readonly attribute PresentationConnectionCloseReason reason;
+  readonly attribute DOMString message;
+};
+
+dictionary PresentationConnectionCloseEventInit : EventInit {
+  required PresentationConnectionCloseReason reason;
+  DOMString message = "";
+};
+
+[SecureContext, Exposed=Window]
+interface PresentationReceiver {
+  readonly attribute Promise<PresentationConnectionList> connectionList;
+};
+
+[SecureContext, Exposed=Window]
+interface PresentationConnectionList : EventTarget {
+  readonly attribute FrozenArray<PresentationConnection> connections;
+  attribute EventHandler onconnectionavailable;
+};
diff --git a/test/wpt/tests/interfaces/priority-hints.idl b/test/wpt/tests/interfaces/priority-hints.idl
new file mode 100644
index 00000000000..cbff6a5222d
--- /dev/null
+++ b/test/wpt/tests/interfaces/priority-hints.idl
@@ -0,0 +1,20 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Priority Hints (https://wicg.github.io/priority-hints/)
+
+partial interface HTMLImageElement {
+    [CEReactions] attribute DOMString fetchPriority;
+};
+
+partial interface HTMLLinkElement {
+    [CEReactions] attribute DOMString fetchPriority;
+};
+
+partial interface HTMLScriptElement {
+    [CEReactions] attribute DOMString fetchPriority;
+};
+
+partial interface HTMLIFrameElement {
+    [CEReactions] attribute DOMString fetchPriority;
+};
diff --git a/test/wpt/tests/interfaces/private-click-measurement.idl b/test/wpt/tests/interfaces/private-click-measurement.idl
new file mode 100644
index 00000000000..3bed7ccf991
--- /dev/null
+++ b/test/wpt/tests/interfaces/private-click-measurement.idl
@@ -0,0 +1,8 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Private Click Measurement (https://privacycg.github.io/private-click-measurement/)
+
+partial interface HTMLAnchorElement {
+    [CEReactions] attribute unsigned long attributionSourceId;
+};
diff --git a/test/wpt/tests/interfaces/proximity.idl b/test/wpt/tests/interfaces/proximity.idl
new file mode 100644
index 00000000000..3cbfbd5ad13
--- /dev/null
+++ b/test/wpt/tests/interfaces/proximity.idl
@@ -0,0 +1,18 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Proximity Sensor (https://w3c.github.io/proximity/)
+
+[SecureContext, Exposed=Window]
+interface ProximitySensor : Sensor {
+  constructor(optional SensorOptions sensorOptions = {});
+  readonly attribute double? distance;
+  readonly attribute double? max;
+  readonly attribute boolean? near;
+};
+
+dictionary ProximityReadingValues {
+  required double? distance;
+  required double? max;
+  required boolean? near;
+};
diff --git a/test/wpt/tests/interfaces/push-api.idl b/test/wpt/tests/interfaces/push-api.idl
new file mode 100644
index 00000000000..f582788806c
--- /dev/null
+++ b/test/wpt/tests/interfaces/push-api.idl
@@ -0,0 +1,93 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Push API (https://w3c.github.io/push-api/)
+
+dictionary PushPermissionDescriptor : PermissionDescriptor {
+  boolean userVisibleOnly = false;
+};
+
+[SecureContext]
+partial interface ServiceWorkerRegistration {
+  readonly attribute PushManager pushManager;
+};
+
+[Exposed=(Window,Worker), SecureContext]
+interface PushManager {
+  [SameObject] static readonly attribute FrozenArray<DOMString> supportedContentEncodings;
+
+  Promise<PushSubscription> subscribe(optional PushSubscriptionOptionsInit options = {});
+  Promise<PushSubscription?> getSubscription();
+  Promise<PermissionState> permissionState(optional PushSubscriptionOptionsInit options = {});
+};
+
+[Exposed=(Window,Worker), SecureContext]
+interface PushSubscriptionOptions {
+  readonly attribute boolean userVisibleOnly;
+  [SameObject] readonly attribute ArrayBuffer? applicationServerKey;
+};
+
+dictionary PushSubscriptionOptionsInit {
+  boolean userVisibleOnly = false;
+  (BufferSource or DOMString)? applicationServerKey = null;
+};
+
+[Exposed=(Window,Worker), SecureContext]
+interface PushSubscription {
+  readonly attribute USVString endpoint;
+  readonly attribute EpochTimeStamp? expirationTime;
+  [SameObject] readonly attribute PushSubscriptionOptions options;
+  ArrayBuffer? getKey(PushEncryptionKeyName name);
+  Promise<boolean> unsubscribe();
+
+  PushSubscriptionJSON toJSON();
+};
+
+dictionary PushSubscriptionJSON {
+  USVString endpoint;
+  EpochTimeStamp? expirationTime = null;
+  record<DOMString, USVString> keys;
+};
+
+enum PushEncryptionKeyName {
+  "p256dh",
+  "auth"
+};
+
+[Exposed=ServiceWorker, SecureContext]
+interface PushMessageData {
+  ArrayBuffer arrayBuffer();
+  Blob blob();
+  any json();
+  USVString text();
+};
+
+[Exposed=ServiceWorker, SecureContext]
+partial interface ServiceWorkerGlobalScope {
+  attribute EventHandler onpush;
+  attribute EventHandler onpushsubscriptionchange;
+};
+
+[Exposed=ServiceWorker, SecureContext]
+interface PushEvent : ExtendableEvent {
+  constructor(DOMString type, optional PushEventInit eventInitDict = {});
+  readonly attribute PushMessageData? data;
+};
+
+typedef (BufferSource or USVString) PushMessageDataInit;
+
+dictionary PushEventInit : ExtendableEventInit {
+  PushMessageDataInit data;
+};
+
+[Exposed=ServiceWorker, SecureContext]
+interface PushSubscriptionChangeEvent : ExtendableEvent {
+  constructor(DOMString type, optional PushSubscriptionChangeEventInit eventInitDict = {});
+  readonly attribute PushSubscription? newSubscription;
+  readonly attribute PushSubscription? oldSubscription;
+};
+
+dictionary PushSubscriptionChangeEventInit : ExtendableEventInit {
+  PushSubscription newSubscription = null;
+  PushSubscription oldSubscription = null;
+};
diff --git a/test/wpt/tests/interfaces/raw-camera-access.idl b/test/wpt/tests/interfaces/raw-camera-access.idl
new file mode 100644
index 00000000000..d8ee0bb3a46
--- /dev/null
+++ b/test/wpt/tests/interfaces/raw-camera-access.idl
@@ -0,0 +1,18 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: WebXR Raw Camera Access Module (https://immersive-web.github.io/raw-camera-access/)
+
+partial interface XRView {
+  [SameObject] readonly attribute XRCamera? camera;
+};
+
+[SecureContext, Exposed=Window]
+interface XRCamera {
+  readonly attribute unsigned long width;
+  readonly attribute unsigned long height;
+};
+
+partial interface XRWebGLBinding {
+  WebGLTexture? getCameraImage(XRCamera camera);
+};
diff --git a/test/wpt/tests/interfaces/remote-playback.idl b/test/wpt/tests/interfaces/remote-playback.idl
new file mode 100644
index 00000000000..25224108675
--- /dev/null
+++ b/test/wpt/tests/interfaces/remote-playback.idl
@@ -0,0 +1,32 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Remote Playback API (https://w3c.github.io/remote-playback/)
+
+[Exposed=Window]
+interface RemotePlayback : EventTarget {
+  Promise<long> watchAvailability(RemotePlaybackAvailabilityCallback callback);
+  Promise<undefined> cancelWatchAvailability(optional long id);
+
+  readonly attribute RemotePlaybackState state;
+
+  attribute EventHandler onconnecting;
+  attribute EventHandler onconnect;
+  attribute EventHandler ondisconnect;
+
+  Promise<undefined> prompt();
+};
+
+enum RemotePlaybackState {
+  "connecting",
+  "connected",
+  "disconnected"
+};
+
+callback RemotePlaybackAvailabilityCallback = undefined(boolean available);
+
+partial interface HTMLMediaElement {
+  [SameObject] readonly attribute RemotePlayback remote;
+
+  [CEReactions] attribute boolean disableRemotePlayback;
+};
diff --git a/test/wpt/tests/interfaces/reporting.idl b/test/wpt/tests/interfaces/reporting.idl
new file mode 100644
index 00000000000..c0a400a999e
--- /dev/null
+++ b/test/wpt/tests/interfaces/reporting.idl
@@ -0,0 +1,39 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Reporting API (https://w3c.github.io/reporting/)
+
+[Exposed=(Window,Worker)]
+interface ReportBody {
+  [Default] object toJSON();
+};
+
+[Exposed=(Window,Worker)]
+interface Report {
+  [Default] object toJSON();
+  readonly attribute DOMString type;
+  readonly attribute DOMString url;
+  readonly attribute ReportBody? body;
+};
+
+[Exposed=(Window,Worker)]
+interface ReportingObserver {
+  constructor(ReportingObserverCallback callback, optional ReportingObserverOptions options = {});
+  undefined observe();
+  undefined disconnect();
+  ReportList takeRecords();
+};
+
+callback ReportingObserverCallback = undefined (sequence<Report> reports, ReportingObserver observer);
+
+dictionary ReportingObserverOptions {
+  sequence<DOMString> types;
+  boolean buffered = false;
+};
+
+typedef sequence<Report> ReportList;
+
+dictionary GenerateTestReportParameters {
+  required DOMString message;
+  DOMString group = "default";
+};
diff --git a/test/wpt/tests/interfaces/requestidlecallback.idl b/test/wpt/tests/interfaces/requestidlecallback.idl
new file mode 100644
index 00000000000..9c49aa1854f
--- /dev/null
+++ b/test/wpt/tests/interfaces/requestidlecallback.idl
@@ -0,0 +1,20 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: requestIdleCallback() (https://w3c.github.io/requestidlecallback/)
+
+partial interface Window {
+  unsigned long requestIdleCallback(IdleRequestCallback callback, optional IdleRequestOptions options = {});
+  undefined cancelIdleCallback(unsigned long handle);
+};
+
+dictionary IdleRequestOptions {
+  unsigned long timeout;
+};
+
+[Exposed=Window] interface IdleDeadline {
+  DOMHighResTimeStamp timeRemaining();
+  readonly attribute boolean didTimeout;
+};
+
+callback IdleRequestCallback = undefined (IdleDeadline deadline);
diff --git a/test/wpt/tests/interfaces/resize-observer.idl b/test/wpt/tests/interfaces/resize-observer.idl
new file mode 100644
index 00000000000..07f97031208
--- /dev/null
+++ b/test/wpt/tests/interfaces/resize-observer.idl
@@ -0,0 +1,37 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Resize Observer (https://drafts.csswg.org/resize-observer-1/)
+
+enum ResizeObserverBoxOptions {
+    "border-box", "content-box", "device-pixel-content-box"
+};
+
+dictionary ResizeObserverOptions {
+    ResizeObserverBoxOptions box = "content-box";
+};
+
+[Exposed=(Window)]
+interface ResizeObserver {
+    constructor(ResizeObserverCallback callback);
+    undefined observe(Element target, optional ResizeObserverOptions options = {});
+    undefined unobserve(Element target);
+    undefined disconnect();
+};
+
+callback ResizeObserverCallback = undefined (sequence<ResizeObserverEntry> entries, ResizeObserver observer);
+
+[Exposed=Window]
+interface ResizeObserverEntry {
+    readonly attribute Element target;
+    readonly attribute DOMRectReadOnly contentRect;
+    readonly attribute FrozenArray<ResizeObserverSize> borderBoxSize;
+    readonly attribute FrozenArray<ResizeObserverSize> contentBoxSize;
+    readonly attribute FrozenArray<ResizeObserverSize> devicePixelContentBoxSize;
+};
+
+[Exposed=Window]
+interface ResizeObserverSize {
+    readonly attribute unrestricted double inlineSize;
+    readonly attribute unrestricted double blockSize;
+};
diff --git a/test/wpt/tests/interfaces/resource-timing.idl b/test/wpt/tests/interfaces/resource-timing.idl
new file mode 100644
index 00000000000..242df0bd804
--- /dev/null
+++ b/test/wpt/tests/interfaces/resource-timing.idl
@@ -0,0 +1,39 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Resource Timing (https://w3c.github.io/resource-timing/)
+
+[Exposed=(Window,Worker)]
+interface PerformanceResourceTiming : PerformanceEntry {
+    readonly attribute DOMString initiatorType;
+    readonly attribute ByteString nextHopProtocol;
+    readonly attribute DOMHighResTimeStamp workerStart;
+    readonly attribute DOMHighResTimeStamp redirectStart;
+    readonly attribute DOMHighResTimeStamp redirectEnd;
+    readonly attribute DOMHighResTimeStamp fetchStart;
+    readonly attribute DOMHighResTimeStamp domainLookupStart;
+    readonly attribute DOMHighResTimeStamp domainLookupEnd;
+    readonly attribute DOMHighResTimeStamp connectStart;
+    readonly attribute DOMHighResTimeStamp connectEnd;
+    readonly attribute DOMHighResTimeStamp secureConnectionStart;
+    readonly attribute DOMHighResTimeStamp requestStart;
+    readonly attribute DOMHighResTimeStamp responseStart;
+    readonly attribute DOMHighResTimeStamp responseEnd;
+    readonly attribute unsigned long long  transferSize;
+    readonly attribute unsigned long long  encodedBodySize;
+    readonly attribute unsigned long long  decodedBodySize;
+    readonly attribute unsigned short responseStatus;
+    readonly attribute RenderBlockingStatusType renderBlockingStatus;
+    [Default] object toJSON();
+};
+
+enum RenderBlockingStatusType {
+    "blocking",
+    "non-blocking"
+};
+
+partial interface Performance {
+  undefined clearResourceTimings ();
+  undefined setResourceTimingBufferSize (unsigned long maxSize);
+  attribute EventHandler onresourcetimingbufferfull;
+};
diff --git a/test/wpt/tests/interfaces/sanitizer-api.idl b/test/wpt/tests/interfaces/sanitizer-api.idl
new file mode 100644
index 00000000000..117a55fdf77
--- /dev/null
+++ b/test/wpt/tests/interfaces/sanitizer-api.idl
@@ -0,0 +1,38 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: HTML Sanitizer API (https://wicg.github.io/sanitizer-api/)
+
+[
+  Exposed=(Window),
+  SecureContext
+] interface Sanitizer {
+  constructor(optional SanitizerConfig config = {});
+
+  DocumentFragment sanitize((Document or DocumentFragment) input);
+  Element? sanitizeFor(DOMString element, DOMString input);
+
+  SanitizerConfig getConfiguration();
+  static SanitizerConfig getDefaultConfiguration();
+};
+
+dictionary SetHTMLOptions {
+  Sanitizer sanitizer;
+};
+[SecureContext]
+partial interface Element {
+  undefined setHTML(DOMString input, optional SetHTMLOptions options = {});
+};
+
+dictionary SanitizerConfig {
+  sequence<DOMString> allowElements;
+  sequence<DOMString> blockElements;
+  sequence<DOMString> dropElements;
+  AttributeMatchList allowAttributes;
+  AttributeMatchList dropAttributes;
+  boolean allowCustomElements;
+  boolean allowUnknownMarkup;
+  boolean allowComments;
+};
+
+typedef record<DOMString, sequence<DOMString>> AttributeMatchList;
diff --git a/test/wpt/tests/interfaces/sanitizer-api.tentative.idl b/test/wpt/tests/interfaces/sanitizer-api.tentative.idl
new file mode 100644
index 00000000000..3e843d8eb0c
--- /dev/null
+++ b/test/wpt/tests/interfaces/sanitizer-api.tentative.idl
@@ -0,0 +1,17 @@
+// https://wicg.github.io/sanitizer-api/
+
+[
+  Exposed=Window,
+  SecureContext
+] interface Sanitizer {
+  constructor(optional SanitizerConfig sanitizerConfig = {});
+  DocumentFragment sanitize((DocumentFragment or Document) input);
+};
+
+dictionary SanitizerConfig {
+  sequence<DOMString> allowElements;
+  sequence<DOMString> blockElements;
+  sequence<DOMString> dropElements;
+  sequence<DOMString> allowAttributes;
+  sequence<DOMString> dropAttributes;
+};
diff --git a/test/wpt/tests/interfaces/savedata.idl b/test/wpt/tests/interfaces/savedata.idl
new file mode 100644
index 00000000000..f1274b8ef74
--- /dev/null
+++ b/test/wpt/tests/interfaces/savedata.idl
@@ -0,0 +1,10 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Save Data API (https://wicg.github.io/savedata/)
+
+interface mixin NetworkInformationSaveData {
+  [SameObject] readonly attribute boolean saveData;
+};
+
+NetworkInformation includes NetworkInformationSaveData;
diff --git a/test/wpt/tests/interfaces/scheduling-apis.idl b/test/wpt/tests/interfaces/scheduling-apis.idl
new file mode 100644
index 00000000000..9ed49cfb689
--- /dev/null
+++ b/test/wpt/tests/interfaces/scheduling-apis.idl
@@ -0,0 +1,57 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Prioritized Task Scheduling (https://wicg.github.io/scheduling-apis/)
+
+enum TaskPriority {
+  "user-blocking",
+  "user-visible",
+  "background"
+};
+
+dictionary SchedulerPostTaskOptions {
+  AbortSignal signal;
+  TaskPriority priority;
+  [EnforceRange] unsigned long long delay = 0;
+};
+
+callback SchedulerPostTaskCallback = any ();
+
+[Exposed=(Window, Worker)]
+interface Scheduler {
+  Promise<any> postTask(SchedulerPostTaskCallback callback,
+                        optional SchedulerPostTaskOptions options = {});
+};
+
+[Exposed=(Window, Worker)]
+interface TaskPriorityChangeEvent : Event {
+  constructor(DOMString type, TaskPriorityChangeEventInit priorityChangeEventInitDict);
+
+  readonly attribute TaskPriority previousPriority;
+};
+
+dictionary TaskPriorityChangeEventInit : EventInit {
+  required TaskPriority previousPriority;
+};
+
+dictionary TaskControllerInit {
+  TaskPriority priority = "user-visible";
+};
+
+[Exposed=(Window,Worker)]
+interface TaskController : AbortController {
+  constructor(optional TaskControllerInit init = {});
+
+  undefined setPriority(TaskPriority priority);
+};
+
+[Exposed=(Window, Worker)]
+interface TaskSignal : AbortSignal {
+  readonly attribute TaskPriority priority;
+
+  attribute EventHandler onprioritychange;
+};
+
+partial interface mixin WindowOrWorkerGlobalScope {
+  [Replaceable] readonly attribute Scheduler scheduler;
+};
diff --git a/test/wpt/tests/interfaces/screen-capture.idl b/test/wpt/tests/interfaces/screen-capture.idl
new file mode 100644
index 00000000000..9abd4d2c1ad
--- /dev/null
+++ b/test/wpt/tests/interfaces/screen-capture.idl
@@ -0,0 +1,85 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Screen Capture (https://w3c.github.io/mediacapture-screen-share/)
+
+partial interface MediaDevices {
+  Promise<MediaStream> getDisplayMedia(optional DisplayMediaStreamOptions options = {});
+};
+
+enum CaptureStartFocusBehavior {
+  "focus-captured-surface",
+  "no-focus-change"
+};
+
+[Exposed=Window, SecureContext]
+interface CaptureController {
+  constructor();
+  undefined setFocusBehavior(CaptureStartFocusBehavior focusBehavior);
+};
+
+enum SelfCapturePreferenceEnum {
+  "include",
+  "exclude"
+};
+
+enum SystemAudioPreferenceEnum {
+  "include",
+  "exclude"
+};
+
+enum SurfaceSwitchingPreferenceEnum {
+  "include",
+  "exclude"
+};
+
+dictionary DisplayMediaStreamOptions {
+  (boolean or MediaTrackConstraints) video = true;
+  (boolean or MediaTrackConstraints) audio = false;
+  CaptureController controller;
+  SelfCapturePreferenceEnum selfBrowserSurface;
+  SystemAudioPreferenceEnum systemAudio;
+  SurfaceSwitchingPreferenceEnum surfaceSwitching;
+};
+
+partial dictionary MediaTrackSupportedConstraints {
+  boolean displaySurface = true;
+  boolean logicalSurface = true;
+  boolean cursor = true;
+  boolean restrictOwnAudio = true;
+  boolean suppressLocalAudioPlayback = true;
+};
+
+partial dictionary MediaTrackConstraintSet {
+  ConstrainDOMString displaySurface;
+  ConstrainBoolean logicalSurface;
+  ConstrainDOMString cursor;
+  ConstrainBoolean restrictOwnAudio;
+  ConstrainBoolean suppressLocalAudioPlayback;
+};
+
+partial dictionary MediaTrackSettings {
+  DOMString displaySurface;
+  boolean logicalSurface;
+  DOMString cursor;
+  boolean restrictOwnAudio;
+  boolean suppressLocalAudioPlayback;
+};
+
+partial dictionary MediaTrackCapabilities {
+  DOMString displaySurface;
+  boolean logicalSurface;
+  sequence<DOMString> cursor;
+};
+
+enum DisplayCaptureSurfaceType {
+  "monitor",
+  "window",
+  "browser"
+};
+
+enum CursorCaptureConstraint {
+  "never",
+  "always",
+  "motion"
+};
diff --git a/test/wpt/tests/interfaces/screen-orientation.idl b/test/wpt/tests/interfaces/screen-orientation.idl
new file mode 100644
index 00000000000..df8a1db5392
--- /dev/null
+++ b/test/wpt/tests/interfaces/screen-orientation.idl
@@ -0,0 +1,35 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Screen Orientation (https://w3c.github.io/screen-orientation/)
+
+partial interface Screen {
+  [SameObject] readonly attribute ScreenOrientation orientation;
+};
+
+[Exposed=Window]
+interface ScreenOrientation : EventTarget {
+  Promise<undefined> lock(OrientationLockType orientation);
+  undefined unlock();
+  readonly attribute OrientationType type;
+  readonly attribute unsigned short angle;
+  attribute EventHandler onchange;
+};
+
+enum OrientationLockType {
+  "any",
+  "natural",
+  "landscape",
+  "portrait",
+  "portrait-primary",
+  "portrait-secondary",
+  "landscape-primary",
+  "landscape-secondary"
+};
+
+enum OrientationType {
+  "portrait-primary",
+  "portrait-secondary",
+  "landscape-primary",
+  "landscape-secondary"
+};
diff --git a/test/wpt/tests/interfaces/screen-wake-lock.idl b/test/wpt/tests/interfaces/screen-wake-lock.idl
new file mode 100644
index 00000000000..c9d259ebcc4
--- /dev/null
+++ b/test/wpt/tests/interfaces/screen-wake-lock.idl
@@ -0,0 +1,24 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Screen Wake Lock API (https://w3c.github.io/screen-wake-lock/)
+
+[SecureContext]
+partial interface Navigator {
+  [SameObject] readonly attribute WakeLock wakeLock;
+};
+
+[SecureContext, Exposed=(Window)]
+interface WakeLock {
+  Promise<WakeLockSentinel> request(optional WakeLockType type = "screen");
+};
+
+[SecureContext, Exposed=(Window)]
+interface WakeLockSentinel : EventTarget {
+  readonly attribute boolean released;
+  readonly attribute WakeLockType type;
+  Promise<undefined> release();
+  attribute EventHandler onrelease;
+};
+
+enum WakeLockType { "screen" };
diff --git a/test/wpt/tests/interfaces/scroll-animations.idl b/test/wpt/tests/interfaces/scroll-animations.idl
new file mode 100644
index 00000000000..1fd52dece19
--- /dev/null
+++ b/test/wpt/tests/interfaces/scroll-animations.idl
@@ -0,0 +1,41 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Scroll-driven Animations (https://drafts.csswg.org/scroll-animations-1/)
+
+enum ScrollAxis {
+  "block",
+  "inline",
+  "horizontal",
+  "vertical"
+};
+
+dictionary ScrollTimelineOptions {
+  Element? source;
+  ScrollAxis axis = "block";
+};
+
+[Exposed=Window]
+interface ScrollTimeline : AnimationTimeline {
+  constructor(optional ScrollTimelineOptions options = {});
+  readonly attribute Element? source;
+  readonly attribute ScrollAxis axis;
+};
+
+dictionary ViewTimelineOptions {
+  Element subject;
+  ScrollAxis axis = "block";
+};
+
+[Exposed=Window]
+interface ViewTimeline : ScrollTimeline {
+  constructor(optional ViewTimelineOptions options = {});
+  readonly attribute Element subject;
+  readonly attribute CSSNumericValue startOffset;
+  readonly attribute CSSNumericValue endOffset;
+};
+
+[Exposed=Window]
+partial interface AnimationTimeline {
+  CSSNumericValue? getCurrentTime(optional CSSOMString rangeName);
+};
diff --git a/test/wpt/tests/interfaces/scroll-to-text-fragment.idl b/test/wpt/tests/interfaces/scroll-to-text-fragment.idl
new file mode 100644
index 00000000000..ce571ddd694
--- /dev/null
+++ b/test/wpt/tests/interfaces/scroll-to-text-fragment.idl
@@ -0,0 +1,12 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Text Fragments (https://wicg.github.io/scroll-to-text-fragment/)
+
+[Exposed=Window]
+interface FragmentDirective {
+};
+
+partial interface Document {
+    [SameObject] readonly attribute FragmentDirective fragmentDirective;
+};
diff --git a/test/wpt/tests/interfaces/secure-payment-confirmation.idl b/test/wpt/tests/interfaces/secure-payment-confirmation.idl
new file mode 100644
index 00000000000..6b6083b165e
--- /dev/null
+++ b/test/wpt/tests/interfaces/secure-payment-confirmation.idl
@@ -0,0 +1,59 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Secure Payment Confirmation (https://w3c.github.io/secure-payment-confirmation/)
+
+dictionary SecurePaymentConfirmationRequest {
+    required BufferSource challenge;
+    required USVString rpId;
+    required sequence<BufferSource> credentialIds;
+    required PaymentCredentialInstrument instrument;
+    unsigned long timeout;
+    USVString payeeName;
+    USVString payeeOrigin;
+    AuthenticationExtensionsClientInputs extensions;
+    sequence<USVString> locale;
+    boolean showOptOut;
+};
+
+partial dictionary AuthenticationExtensionsClientInputs {
+  AuthenticationExtensionsPaymentInputs payment;
+};
+
+dictionary AuthenticationExtensionsPaymentInputs {
+  boolean isPayment;
+
+  // Only used for authentication.
+  USVString rpId;
+  USVString topOrigin;
+  USVString payeeName;
+  USVString payeeOrigin;
+  PaymentCurrencyAmount total;
+  PaymentCredentialInstrument instrument;
+};
+
+dictionary CollectedClientPaymentData : CollectedClientData {
+    required CollectedClientAdditionalPaymentData payment;
+};
+
+dictionary CollectedClientAdditionalPaymentData {
+    required USVString rpId;
+    required USVString topOrigin;
+    USVString payeeName;
+    USVString payeeOrigin;
+    required PaymentCurrencyAmount total;
+    required PaymentCredentialInstrument instrument;
+};
+
+dictionary PaymentCredentialInstrument {
+    required USVString displayName;
+    required USVString icon;
+    boolean iconMustBeShown = true;
+};
+
+enum TransactionAutomationMode {
+  "none",
+  "autoAccept",
+  "autoReject",
+  "autoOptOut"
+};
diff --git a/test/wpt/tests/interfaces/selection-api.idl b/test/wpt/tests/interfaces/selection-api.idl
new file mode 100644
index 00000000000..c1eed2a9cf2
--- /dev/null
+++ b/test/wpt/tests/interfaces/selection-api.idl
@@ -0,0 +1,45 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Selection API (https://w3c.github.io/selection-api/)
+
+[Exposed=Window]
+interface Selection {
+  readonly attribute Node? anchorNode;
+  readonly attribute unsigned long anchorOffset;
+  readonly attribute Node? focusNode;
+  readonly attribute unsigned long focusOffset;
+  readonly attribute boolean isCollapsed;
+  readonly attribute unsigned long rangeCount;
+  readonly attribute DOMString type;
+  Range getRangeAt(unsigned long index);
+  undefined addRange(Range range);
+  undefined removeRange(Range range);
+  undefined removeAllRanges();
+  undefined empty();
+  StaticRange getComposedRange(ShadowRoot... shadowRoots);
+  undefined collapse(Node? node, optional unsigned long offset = 0);
+  undefined setPosition(Node? node, optional unsigned long offset = 0);
+  undefined collapseToStart();
+  undefined collapseToEnd();
+  undefined extend(Node node, optional unsigned long offset = 0);
+  undefined setBaseAndExtent(Node anchorNode, unsigned long anchorOffset, Node focusNode, unsigned long focusOffset);
+  undefined selectAllChildren(Node node);
+  undefined modify(optional DOMString alter, optional DOMString direction, optional DOMString granularity);
+  [CEReactions] undefined deleteFromDocument();
+  boolean containsNode(Node node, optional boolean allowPartialContainment = false);
+  stringifier;
+};
+
+partial interface Document {
+  Selection? getSelection();
+};
+
+partial interface Window {
+  Selection? getSelection();
+};
+
+partial interface mixin GlobalEventHandlers {
+  attribute EventHandler onselectstart;
+  attribute EventHandler onselectionchange;
+};
diff --git a/test/wpt/tests/interfaces/serial.idl b/test/wpt/tests/interfaces/serial.idl
new file mode 100644
index 00000000000..ee46a8562bb
--- /dev/null
+++ b/test/wpt/tests/interfaces/serial.idl
@@ -0,0 +1,85 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Web Serial API (https://wicg.github.io/serial/)
+
+[Exposed=Window, SecureContext]
+partial interface Navigator {
+  [SameObject] readonly attribute Serial serial;
+};
+
+[Exposed=DedicatedWorker, SecureContext]
+partial interface WorkerNavigator {
+  [SameObject] readonly attribute Serial serial;
+};
+
+[Exposed=(DedicatedWorker, Window), SecureContext]
+interface Serial : EventTarget {
+  attribute EventHandler onconnect;
+  attribute EventHandler ondisconnect;
+  Promise<sequence<SerialPort>> getPorts();
+  [Exposed=Window] Promise<SerialPort> requestPort(optional SerialPortRequestOptions options = {});
+};
+
+dictionary SerialPortRequestOptions {
+  sequence<SerialPortFilter> filters;
+};
+
+dictionary SerialPortFilter {
+  unsigned short usbVendorId;
+  unsigned short usbProductId;
+};
+
+[Exposed=(DedicatedWorker,Window), SecureContext]
+interface SerialPort : EventTarget {
+  attribute EventHandler onconnect;
+  attribute EventHandler ondisconnect;
+  readonly attribute ReadableStream readable;
+  readonly attribute WritableStream writable;
+
+  SerialPortInfo getInfo();
+
+  Promise<undefined> open(SerialOptions options);
+  Promise<undefined> setSignals(optional SerialOutputSignals signals = {});
+  Promise<SerialInputSignals> getSignals();
+  Promise<undefined> close();
+  Promise<undefined> forget();
+};
+
+dictionary SerialPortInfo {
+  unsigned short usbVendorId;
+  unsigned short usbProductId;
+};
+
+dictionary SerialOptions {
+  [EnforceRange] required unsigned long baudRate;
+  [EnforceRange] octet dataBits = 8;
+  [EnforceRange] octet stopBits = 1;
+  ParityType parity = "none";
+  [EnforceRange] unsigned long bufferSize = 255;
+  FlowControlType flowControl = "none";
+};
+
+enum ParityType {
+  "none",
+  "even",
+  "odd"
+};
+
+enum FlowControlType {
+  "none",
+  "hardware"
+};
+
+dictionary SerialOutputSignals {
+  boolean dataTerminalReady;
+  boolean requestToSend;
+  boolean break;
+};
+
+dictionary SerialInputSignals {
+  required boolean dataCarrierDetect;
+  required boolean clearToSend;
+  required boolean ringIndicator;
+  required boolean dataSetReady;
+};
diff --git a/test/wpt/tests/interfaces/server-timing.idl b/test/wpt/tests/interfaces/server-timing.idl
new file mode 100644
index 00000000000..ef2a761dfca
--- /dev/null
+++ b/test/wpt/tests/interfaces/server-timing.idl
@@ -0,0 +1,17 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Server Timing (https://w3c.github.io/server-timing/)
+
+[Exposed=(Window,Worker)]
+interface PerformanceServerTiming {
+  readonly attribute DOMString name;
+  readonly attribute DOMHighResTimeStamp duration;
+  readonly attribute DOMString description;
+  [Default] object toJSON();
+};
+
+[Exposed=(Window,Worker)]
+partial interface PerformanceResourceTiming {
+  readonly attribute FrozenArray<PerformanceServerTiming> serverTiming;
+};
diff --git a/test/wpt/tests/interfaces/service-workers.idl b/test/wpt/tests/interfaces/service-workers.idl
new file mode 100644
index 00000000000..6d44d61debb
--- /dev/null
+++ b/test/wpt/tests/interfaces/service-workers.idl
@@ -0,0 +1,240 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Service Workers Nightly (https://w3c.github.io/ServiceWorker/)
+
+[SecureContext, Exposed=(Window,Worker)]
+interface ServiceWorker : EventTarget {
+  readonly attribute USVString scriptURL;
+  readonly attribute ServiceWorkerState state;
+  undefined postMessage(any message, sequence<object> transfer);
+  undefined postMessage(any message, optional StructuredSerializeOptions options = {});
+
+  // event
+  attribute EventHandler onstatechange;
+};
+ServiceWorker includes AbstractWorker;
+
+enum ServiceWorkerState {
+  "parsed",
+  "installing",
+  "installed",
+  "activating",
+  "activated",
+  "redundant"
+};
+
+[SecureContext, Exposed=(Window,Worker)]
+interface ServiceWorkerRegistration : EventTarget {
+  readonly attribute ServiceWorker? installing;
+  readonly attribute ServiceWorker? waiting;
+  readonly attribute ServiceWorker? active;
+  [SameObject] readonly attribute NavigationPreloadManager navigationPreload;
+
+  readonly attribute USVString scope;
+  readonly attribute ServiceWorkerUpdateViaCache updateViaCache;
+
+  [NewObject] Promise<undefined> update();
+  [NewObject] Promise<boolean> unregister();
+
+  // event
+  attribute EventHandler onupdatefound;
+};
+
+enum ServiceWorkerUpdateViaCache {
+  "imports",
+  "all",
+  "none"
+};
+
+partial interface Navigator {
+  [SecureContext, SameObject] readonly attribute ServiceWorkerContainer serviceWorker;
+};
+
+partial interface WorkerNavigator {
+  [SecureContext, SameObject] readonly attribute ServiceWorkerContainer serviceWorker;
+};
+
+[SecureContext, Exposed=(Window,Worker)]
+interface ServiceWorkerContainer : EventTarget {
+  readonly attribute ServiceWorker? controller;
+  readonly attribute Promise<ServiceWorkerRegistration> ready;
+
+  [NewObject] Promise<ServiceWorkerRegistration> register(USVString scriptURL, optional RegistrationOptions options = {});
+
+  [NewObject] Promise<(ServiceWorkerRegistration or undefined)> getRegistration(optional USVString clientURL = "");
+  [NewObject] Promise<FrozenArray<ServiceWorkerRegistration>> getRegistrations();
+
+  undefined startMessages();
+
+  // events
+  attribute EventHandler oncontrollerchange;
+  attribute EventHandler onmessage; // event.source of message events is ServiceWorker object
+  attribute EventHandler onmessageerror;
+};
+
+dictionary RegistrationOptions {
+  USVString scope;
+  WorkerType type = "classic";
+  ServiceWorkerUpdateViaCache updateViaCache = "imports";
+};
+
+[SecureContext, Exposed=(Window,Worker)]
+interface NavigationPreloadManager {
+  Promise<undefined> enable();
+  Promise<undefined> disable();
+  Promise<undefined> setHeaderValue(ByteString value);
+  Promise<NavigationPreloadState> getState();
+};
+
+dictionary NavigationPreloadState {
+  boolean enabled = false;
+  ByteString headerValue;
+};
+
+[Global=(Worker,ServiceWorker), Exposed=ServiceWorker]
+interface ServiceWorkerGlobalScope : WorkerGlobalScope {
+  [SameObject] readonly attribute Clients clients;
+  [SameObject] readonly attribute ServiceWorkerRegistration registration;
+  [SameObject] readonly attribute ServiceWorker serviceWorker;
+
+  [NewObject] Promise<undefined> skipWaiting();
+
+  attribute EventHandler oninstall;
+  attribute EventHandler onactivate;
+  attribute EventHandler onfetch;
+
+  attribute EventHandler onmessage;
+  attribute EventHandler onmessageerror;
+};
+
+[Exposed=ServiceWorker]
+interface Client {
+  readonly attribute USVString url;
+  readonly attribute FrameType frameType;
+  readonly attribute DOMString id;
+  readonly attribute ClientType type;
+  undefined postMessage(any message, sequence<object> transfer);
+  undefined postMessage(any message, optional StructuredSerializeOptions options = {});
+};
+
+[Exposed=ServiceWorker]
+interface WindowClient : Client {
+  readonly attribute DocumentVisibilityState visibilityState;
+  readonly attribute boolean focused;
+  [SameObject] readonly attribute FrozenArray<USVString> ancestorOrigins;
+  [NewObject] Promise<WindowClient> focus();
+  [NewObject] Promise<WindowClient?> navigate(USVString url);
+};
+
+enum FrameType {
+  "auxiliary",
+  "top-level",
+  "nested",
+  "none"
+};
+
+[Exposed=ServiceWorker]
+interface Clients {
+  // The objects returned will be new instances every time
+  [NewObject] Promise<(Client or undefined)> get(DOMString id);
+  [NewObject] Promise<FrozenArray<Client>> matchAll(optional ClientQueryOptions options = {});
+  [NewObject] Promise<WindowClient?> openWindow(USVString url);
+  [NewObject] Promise<undefined> claim();
+};
+
+dictionary ClientQueryOptions {
+  boolean includeUncontrolled = false;
+  ClientType type = "window";
+};
+
+enum ClientType {
+  "window",
+  "worker",
+  "sharedworker",
+  "all"
+};
+
+[Exposed=ServiceWorker]
+interface ExtendableEvent : Event {
+  constructor(DOMString type, optional ExtendableEventInit eventInitDict = {});
+  undefined waitUntil(Promise<any> f);
+};
+
+dictionary ExtendableEventInit : EventInit {
+  // Defined for the forward compatibility across the derived events
+};
+
+[Exposed=ServiceWorker]
+interface FetchEvent : ExtendableEvent {
+  constructor(DOMString type, FetchEventInit eventInitDict);
+  [SameObject] readonly attribute Request request;
+  readonly attribute Promise<any> preloadResponse;
+  readonly attribute DOMString clientId;
+  readonly attribute DOMString resultingClientId;
+  readonly attribute DOMString replacesClientId;
+  readonly attribute Promise<undefined> handled;
+
+  undefined respondWith(Promise<Response> r);
+};
+
+dictionary FetchEventInit : ExtendableEventInit {
+  required Request request;
+  Promise<any> preloadResponse;
+  DOMString clientId = "";
+  DOMString resultingClientId = "";
+  DOMString replacesClientId = "";
+  Promise<undefined> handled;
+};
+
+[Exposed=ServiceWorker]
+interface ExtendableMessageEvent : ExtendableEvent {
+  constructor(DOMString type, optional ExtendableMessageEventInit eventInitDict = {});
+  readonly attribute any data;
+  readonly attribute USVString origin;
+  readonly attribute DOMString lastEventId;
+  [SameObject] readonly attribute (Client or ServiceWorker or MessagePort)? source;
+  readonly attribute FrozenArray<MessagePort> ports;
+};
+
+dictionary ExtendableMessageEventInit : ExtendableEventInit {
+  any data = null;
+  USVString origin = "";
+  DOMString lastEventId = "";
+  (Client or ServiceWorker or MessagePort)? source = null;
+  sequence<MessagePort> ports = [];
+};
+
+partial interface mixin WindowOrWorkerGlobalScope {
+  [SecureContext, SameObject] readonly attribute CacheStorage caches;
+};
+
+[SecureContext, Exposed=(Window,Worker)]
+interface Cache {
+  [NewObject] Promise<(Response or undefined)> match(RequestInfo request, optional CacheQueryOptions options = {});
+  [NewObject] Promise<FrozenArray<Response>> matchAll(optional RequestInfo request, optional CacheQueryOptions options = {});
+  [NewObject] Promise<undefined> add(RequestInfo request);
+  [NewObject] Promise<undefined> addAll(sequence<RequestInfo> requests);
+  [NewObject] Promise<undefined> put(RequestInfo request, Response response);
+  [NewObject] Promise<boolean> delete(RequestInfo request, optional CacheQueryOptions options = {});
+  [NewObject] Promise<FrozenArray<Request>> keys(optional RequestInfo request, optional CacheQueryOptions options = {});
+};
+
+dictionary CacheQueryOptions {
+  boolean ignoreSearch = false;
+  boolean ignoreMethod = false;
+  boolean ignoreVary = false;
+};
+
+[SecureContext, Exposed=(Window,Worker)]
+interface CacheStorage {
+  [NewObject] Promise<(Response or undefined)> match(RequestInfo request, optional MultiCacheQueryOptions options = {});
+  [NewObject] Promise<boolean> has(DOMString cacheName);
+  [NewObject] Promise<Cache> open(DOMString cacheName);
+  [NewObject] Promise<boolean> delete(DOMString cacheName);
+  [NewObject] Promise<sequence<DOMString>> keys();
+};
+
+dictionary MultiCacheQueryOptions : CacheQueryOptions {
+  DOMString cacheName;
+};
diff --git a/test/wpt/tests/interfaces/shape-detection-api.idl b/test/wpt/tests/interfaces/shape-detection-api.idl
new file mode 100644
index 00000000000..4fc1f085ea2
--- /dev/null
+++ b/test/wpt/tests/interfaces/shape-detection-api.idl
@@ -0,0 +1,69 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Accelerated Shape Detection in Images (https://wicg.github.io/shape-detection-api/)
+
+[Exposed=(Window,Worker),
+ SecureContext]
+interface FaceDetector {
+  constructor(optional FaceDetectorOptions faceDetectorOptions = {});
+  Promise<sequence<DetectedFace>> detect(ImageBitmapSource image);
+};
+
+dictionary FaceDetectorOptions {
+  unsigned short maxDetectedFaces;
+  boolean fastMode;
+};
+
+dictionary DetectedFace {
+  required DOMRectReadOnly boundingBox;
+  required FrozenArray<Landmark>? landmarks;
+};
+
+dictionary Landmark {
+  required FrozenArray<Point2D> locations;
+  LandmarkType type;
+};
+
+enum LandmarkType {
+  "mouth",
+  "eye",
+  "nose"
+};
+
+[Exposed=(Window,Worker),
+ SecureContext]
+interface BarcodeDetector {
+  constructor(optional BarcodeDetectorOptions barcodeDetectorOptions = {});
+  static Promise<sequence<BarcodeFormat>> getSupportedFormats();
+
+  Promise<sequence<DetectedBarcode>> detect(ImageBitmapSource image);
+};
+
+dictionary BarcodeDetectorOptions {
+  sequence<BarcodeFormat> formats;
+};
+
+dictionary DetectedBarcode {
+  required DOMRectReadOnly boundingBox;
+  required DOMString rawValue;
+  required BarcodeFormat format;
+  required FrozenArray<Point2D> cornerPoints;
+};
+
+enum BarcodeFormat {
+  "aztec",
+  "code_128",
+  "code_39",
+  "code_93",
+  "codabar",
+  "data_matrix",
+  "ean_13",
+  "ean_8",
+  "itf",
+  "pdf417",
+  "qr_code",
+  "unknown",
+  "upc_a",
+  "upc_e"
+};
diff --git a/test/wpt/tests/interfaces/speech-api.idl b/test/wpt/tests/interfaces/speech-api.idl
new file mode 100644
index 00000000000..74085481525
--- /dev/null
+++ b/test/wpt/tests/interfaces/speech-api.idl
@@ -0,0 +1,202 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Web Speech API (https://wicg.github.io/speech-api/)
+
+[Exposed=Window]
+interface SpeechRecognition : EventTarget {
+    constructor();
+
+    // recognition parameters
+    attribute SpeechGrammarList grammars;
+    attribute DOMString lang;
+    attribute boolean continuous;
+    attribute boolean interimResults;
+    attribute unsigned long maxAlternatives;
+
+    // methods to drive the speech interaction
+    undefined start();
+    undefined stop();
+    undefined abort();
+
+    // event methods
+    attribute EventHandler onaudiostart;
+    attribute EventHandler onsoundstart;
+    attribute EventHandler onspeechstart;
+    attribute EventHandler onspeechend;
+    attribute EventHandler onsoundend;
+    attribute EventHandler onaudioend;
+    attribute EventHandler onresult;
+    attribute EventHandler onnomatch;
+    attribute EventHandler onerror;
+    attribute EventHandler onstart;
+    attribute EventHandler onend;
+};
+
+enum SpeechRecognitionErrorCode {
+    "no-speech",
+    "aborted",
+    "audio-capture",
+    "network",
+    "not-allowed",
+    "service-not-allowed",
+    "bad-grammar",
+    "language-not-supported"
+};
+
+[Exposed=Window]
+interface SpeechRecognitionErrorEvent : Event {
+    constructor(DOMString type, SpeechRecognitionErrorEventInit eventInitDict);
+    readonly attribute SpeechRecognitionErrorCode error;
+    readonly attribute DOMString message;
+};
+
+dictionary SpeechRecognitionErrorEventInit : EventInit {
+    required SpeechRecognitionErrorCode error;
+    DOMString message = "";
+};
+
+// Item in N-best list
+[Exposed=Window]
+interface SpeechRecognitionAlternative {
+    readonly attribute DOMString transcript;
+    readonly attribute float confidence;
+};
+
+// A complete one-shot simple response
+[Exposed=Window]
+interface SpeechRecognitionResult {
+    readonly attribute unsigned long length;
+    getter SpeechRecognitionAlternative item(unsigned long index);
+    readonly attribute boolean isFinal;
+};
+
+// A collection of responses (used in continuous mode)
+[Exposed=Window]
+interface SpeechRecognitionResultList {
+    readonly attribute unsigned long length;
+    getter SpeechRecognitionResult item(unsigned long index);
+};
+
+// A full response, which could be interim or final, part of a continuous response or not
+[Exposed=Window]
+interface SpeechRecognitionEvent : Event {
+    constructor(DOMString type, SpeechRecognitionEventInit eventInitDict);
+    readonly attribute unsigned long resultIndex;
+    readonly attribute SpeechRecognitionResultList results;
+};
+
+dictionary SpeechRecognitionEventInit : EventInit {
+    unsigned long resultIndex = 0;
+    required SpeechRecognitionResultList results;
+};
+
+// The object representing a speech grammar
+[Exposed=Window]
+interface SpeechGrammar {
+    attribute DOMString src;
+    attribute float weight;
+};
+
+// The object representing a speech grammar collection
+[Exposed=Window]
+interface SpeechGrammarList {
+    constructor();
+    readonly attribute unsigned long length;
+    getter SpeechGrammar item(unsigned long index);
+    undefined addFromURI(DOMString src,
+                    optional float weight = 1.0);
+    undefined addFromString(DOMString string,
+                    optional float weight = 1.0);
+};
+
+[Exposed=Window]
+interface SpeechSynthesis : EventTarget {
+    readonly attribute boolean pending;
+    readonly attribute boolean speaking;
+    readonly attribute boolean paused;
+
+    attribute EventHandler onvoiceschanged;
+
+    undefined speak(SpeechSynthesisUtterance utterance);
+    undefined cancel();
+    undefined pause();
+    undefined resume();
+    sequence<SpeechSynthesisVoice> getVoices();
+};
+
+partial interface Window {
+    [SameObject] readonly attribute SpeechSynthesis speechSynthesis;
+};
+
+[Exposed=Window]
+interface SpeechSynthesisUtterance : EventTarget {
+    constructor(optional DOMString text);
+
+    attribute DOMString text;
+    attribute DOMString lang;
+    attribute SpeechSynthesisVoice? voice;
+    attribute float volume;
+    attribute float rate;
+    attribute float pitch;
+
+    attribute EventHandler onstart;
+    attribute EventHandler onend;
+    attribute EventHandler onerror;
+    attribute EventHandler onpause;
+    attribute EventHandler onresume;
+    attribute EventHandler onmark;
+    attribute EventHandler onboundary;
+};
+
+[Exposed=Window]
+interface SpeechSynthesisEvent : Event {
+    constructor(DOMString type, SpeechSynthesisEventInit eventInitDict);
+    readonly attribute SpeechSynthesisUtterance utterance;
+    readonly attribute unsigned long charIndex;
+    readonly attribute unsigned long charLength;
+    readonly attribute float elapsedTime;
+    readonly attribute DOMString name;
+};
+
+dictionary SpeechSynthesisEventInit : EventInit {
+    required SpeechSynthesisUtterance utterance;
+    unsigned long charIndex = 0;
+    unsigned long charLength = 0;
+    float elapsedTime = 0;
+    DOMString name = "";
+};
+
+enum SpeechSynthesisErrorCode {
+    "canceled",
+    "interrupted",
+    "audio-busy",
+    "audio-hardware",
+    "network",
+    "synthesis-unavailable",
+    "synthesis-failed",
+    "language-unavailable",
+    "voice-unavailable",
+    "text-too-long",
+    "invalid-argument",
+    "not-allowed",
+};
+
+[Exposed=Window]
+interface SpeechSynthesisErrorEvent : SpeechSynthesisEvent {
+    constructor(DOMString type, SpeechSynthesisErrorEventInit eventInitDict);
+    readonly attribute SpeechSynthesisErrorCode error;
+};
+
+dictionary SpeechSynthesisErrorEventInit : SpeechSynthesisEventInit {
+    required SpeechSynthesisErrorCode error;
+};
+
+[Exposed=Window]
+interface SpeechSynthesisVoice {
+    readonly attribute DOMString voiceURI;
+    readonly attribute DOMString name;
+    readonly attribute DOMString lang;
+    readonly attribute boolean localService;
+    readonly attribute boolean default;
+};
diff --git a/test/wpt/tests/interfaces/storage-access.idl b/test/wpt/tests/interfaces/storage-access.idl
new file mode 100644
index 00000000000..fff583e0982
--- /dev/null
+++ b/test/wpt/tests/interfaces/storage-access.idl
@@ -0,0 +1,9 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: The Storage Access API (https://privacycg.github.io/storage-access/)
+
+partial interface Document {
+  Promise<boolean> hasStorageAccess();
+  Promise<undefined> requestStorageAccess();
+};
diff --git a/test/wpt/tests/interfaces/storage-buckets.tentative.idl b/test/wpt/tests/interfaces/storage-buckets.tentative.idl
new file mode 100644
index 00000000000..73d72ceab98
--- /dev/null
+++ b/test/wpt/tests/interfaces/storage-buckets.tentative.idl
@@ -0,0 +1,36 @@
+[
+  Exposed=(Window,Worker),
+  SecureContext
+] interface StorageBucketManager {
+    Promise<StorageBucket> open(DOMString name,
+                                optional StorageBucketOptions options = {});
+    Promise<sequence<DOMString>> keys();
+    Promise<undefined> delete(DOMString name);
+};
+
+dictionary StorageBucketOptions {
+  boolean persisted = false;
+  StorageBucketDurability durability = "relaxed";
+  unsigned long long? quota = null;
+  DOMTimeStamp? expires = null;
+};
+
+enum StorageBucketDurability {
+  "strict",
+  "relaxed"
+};
+
+[
+  Exposed=(Window,Worker),
+  SecureContext
+] interface StorageBucket {
+  [Exposed=Window] Promise<boolean> persist();
+  Promise<boolean> persisted();
+
+  Promise<StorageEstimate> estimate();
+
+  Promise<StorageBucketDurability> durability();
+
+  Promise<undefined> setExpires(DOMTimeStamp expires);
+  Promise<DOMTimeStamp> expires();
+};
diff --git a/test/wpt/tests/interfaces/storage.idl b/test/wpt/tests/interfaces/storage.idl
new file mode 100644
index 00000000000..d47e37c40e8
--- /dev/null
+++ b/test/wpt/tests/interfaces/storage.idl
@@ -0,0 +1,25 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Storage Standard (https://storage.spec.whatwg.org/)
+
+[SecureContext]
+interface mixin NavigatorStorage {
+  [SameObject] readonly attribute StorageManager storage;
+};
+Navigator includes NavigatorStorage;
+WorkerNavigator includes NavigatorStorage;
+
+[SecureContext,
+ Exposed=(Window,Worker)]
+interface StorageManager {
+  Promise<boolean> persisted();
+  [Exposed=Window] Promise<boolean> persist();
+
+  Promise<StorageEstimate> estimate();
+};
+
+dictionary StorageEstimate {
+  unsigned long long usage;
+  unsigned long long quota;
+};
diff --git a/test/wpt/tests/interfaces/streams.idl b/test/wpt/tests/interfaces/streams.idl
new file mode 100644
index 00000000000..fd5420f16a0
--- /dev/null
+++ b/test/wpt/tests/interfaces/streams.idl
@@ -0,0 +1,222 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Streams Standard (https://streams.spec.whatwg.org/)
+
+[Exposed=*, Transferable]
+interface ReadableStream {
+  constructor(optional object underlyingSource, optional QueuingStrategy strategy = {});
+
+  readonly attribute boolean locked;
+
+  Promise<undefined> cancel(optional any reason);
+  ReadableStreamReader getReader(optional ReadableStreamGetReaderOptions options = {});
+  ReadableStream pipeThrough(ReadableWritablePair transform, optional StreamPipeOptions options = {});
+  Promise<undefined> pipeTo(WritableStream destination, optional StreamPipeOptions options = {});
+  sequence<ReadableStream> tee();
+
+  async iterable<any>(optional ReadableStreamIteratorOptions options = {});
+};
+
+typedef (ReadableStreamDefaultReader or ReadableStreamBYOBReader) ReadableStreamReader;
+
+enum ReadableStreamReaderMode { "byob" };
+
+dictionary ReadableStreamGetReaderOptions {
+  ReadableStreamReaderMode mode;
+};
+
+dictionary ReadableStreamIteratorOptions {
+  boolean preventCancel = false;
+};
+
+dictionary ReadableWritablePair {
+  required ReadableStream readable;
+  required WritableStream writable;
+};
+
+dictionary StreamPipeOptions {
+  boolean preventClose = false;
+  boolean preventAbort = false;
+  boolean preventCancel = false;
+  AbortSignal signal;
+};
+
+dictionary UnderlyingSource {
+  UnderlyingSourceStartCallback start;
+  UnderlyingSourcePullCallback pull;
+  UnderlyingSourceCancelCallback cancel;
+  ReadableStreamType type;
+  [EnforceRange] unsigned long long autoAllocateChunkSize;
+};
+
+typedef (ReadableStreamDefaultController or ReadableByteStreamController) ReadableStreamController;
+
+callback UnderlyingSourceStartCallback = any (ReadableStreamController controller);
+callback UnderlyingSourcePullCallback = Promise<undefined> (ReadableStreamController controller);
+callback UnderlyingSourceCancelCallback = Promise<undefined> (optional any reason);
+
+enum ReadableStreamType { "bytes" };
+
+interface mixin ReadableStreamGenericReader {
+  readonly attribute Promise<undefined> closed;
+
+  Promise<undefined> cancel(optional any reason);
+};
+
+[Exposed=*]
+interface ReadableStreamDefaultReader {
+  constructor(ReadableStream stream);
+
+  Promise<ReadableStreamReadResult> read();
+  undefined releaseLock();
+};
+ReadableStreamDefaultReader includes ReadableStreamGenericReader;
+
+dictionary ReadableStreamReadResult {
+  any value;
+  boolean done;
+};
+
+[Exposed=*]
+interface ReadableStreamBYOBReader {
+  constructor(ReadableStream stream);
+
+  Promise<ReadableStreamReadResult> read(ArrayBufferView view);
+  undefined releaseLock();
+};
+ReadableStreamBYOBReader includes ReadableStreamGenericReader;
+
+[Exposed=*]
+interface ReadableStreamDefaultController {
+  readonly attribute unrestricted double? desiredSize;
+
+  undefined close();
+  undefined enqueue(optional any chunk);
+  undefined error(optional any e);
+};
+
+[Exposed=*]
+interface ReadableByteStreamController {
+  readonly attribute ReadableStreamBYOBRequest? byobRequest;
+  readonly attribute unrestricted double? desiredSize;
+
+  undefined close();
+  undefined enqueue(ArrayBufferView chunk);
+  undefined error(optional any e);
+};
+
+[Exposed=*]
+interface ReadableStreamBYOBRequest {
+  readonly attribute ArrayBufferView? view;
+
+  undefined respond([EnforceRange] unsigned long long bytesWritten);
+  undefined respondWithNewView(ArrayBufferView view);
+};
+
+[Exposed=*, Transferable]
+interface WritableStream {
+  constructor(optional object underlyingSink, optional QueuingStrategy strategy = {});
+
+  readonly attribute boolean locked;
+
+  Promise<undefined> abort(optional any reason);
+  Promise<undefined> close();
+  WritableStreamDefaultWriter getWriter();
+};
+
+dictionary UnderlyingSink {
+  UnderlyingSinkStartCallback start;
+  UnderlyingSinkWriteCallback write;
+  UnderlyingSinkCloseCallback close;
+  UnderlyingSinkAbortCallback abort;
+  any type;
+};
+
+callback UnderlyingSinkStartCallback = any (WritableStreamDefaultController controller);
+callback UnderlyingSinkWriteCallback = Promise<undefined> (any chunk, WritableStreamDefaultController controller);
+callback UnderlyingSinkCloseCallback = Promise<undefined> ();
+callback UnderlyingSinkAbortCallback = Promise<undefined> (optional any reason);
+
+[Exposed=*]
+interface WritableStreamDefaultWriter {
+  constructor(WritableStream stream);
+
+  readonly attribute Promise<undefined> closed;
+  readonly attribute unrestricted double? desiredSize;
+  readonly attribute Promise<undefined> ready;
+
+  Promise<undefined> abort(optional any reason);
+  Promise<undefined> close();
+  undefined releaseLock();
+  Promise<undefined> write(optional any chunk);
+};
+
+[Exposed=*]
+interface WritableStreamDefaultController {
+  readonly attribute AbortSignal signal;
+  undefined error(optional any e);
+};
+
+[Exposed=*, Transferable]
+interface TransformStream {
+  constructor(optional object transformer,
+              optional QueuingStrategy writableStrategy = {},
+              optional QueuingStrategy readableStrategy = {});
+
+  readonly attribute ReadableStream readable;
+  readonly attribute WritableStream writable;
+};
+
+dictionary Transformer {
+  TransformerStartCallback start;
+  TransformerTransformCallback transform;
+  TransformerFlushCallback flush;
+  any readableType;
+  any writableType;
+};
+
+callback TransformerStartCallback = any (TransformStreamDefaultController controller);
+callback TransformerFlushCallback = Promise<undefined> (TransformStreamDefaultController controller);
+callback TransformerTransformCallback = Promise<undefined> (any chunk, TransformStreamDefaultController controller);
+
+[Exposed=*]
+interface TransformStreamDefaultController {
+  readonly attribute unrestricted double? desiredSize;
+
+  undefined enqueue(optional any chunk);
+  undefined error(optional any reason);
+  undefined terminate();
+};
+
+dictionary QueuingStrategy {
+  unrestricted double highWaterMark;
+  QueuingStrategySize size;
+};
+
+callback QueuingStrategySize = unrestricted double (any chunk);
+
+dictionary QueuingStrategyInit {
+  required unrestricted double highWaterMark;
+};
+
+[Exposed=*]
+interface ByteLengthQueuingStrategy {
+  constructor(QueuingStrategyInit init);
+
+  readonly attribute unrestricted double highWaterMark;
+  readonly attribute Function size;
+};
+
+[Exposed=*]
+interface CountQueuingStrategy {
+  constructor(QueuingStrategyInit init);
+
+  readonly attribute unrestricted double highWaterMark;
+  readonly attribute Function size;
+};
+
+interface mixin GenericTransformStream {
+  readonly attribute ReadableStream readable;
+  readonly attribute WritableStream writable;
+};
diff --git a/test/wpt/tests/interfaces/sub-apps.tentative.idl b/test/wpt/tests/interfaces/sub-apps.tentative.idl
new file mode 100644
index 00000000000..39dcd97a500
--- /dev/null
+++ b/test/wpt/tests/interfaces/sub-apps.tentative.idl
@@ -0,0 +1,17 @@
+[
+  Exposed=Window,
+  SecureContext,
+  ImplementedAs=SubApps
+] partial interface Navigator {
+  [SameObject, RuntimeEnabled=DesktopPWAsSubApps] readonly attribute SubApps subApps;
+};
+
+[
+  Exposed=Window,
+  SecureContext,
+  RuntimeEnabled=DesktopPWAsSubApps
+] interface SubApps {
+  [CallWith=ScriptState, RaisesException] Promise<undefined> add(DOMString install_url);
+  [CallWith=ScriptState, RaisesException] Promise<FrozenArray<DOMString>> list();
+  [CallWith=ScriptState, RaisesException] Promise<undefined> remove(DOMString app_id);
+};
diff --git a/test/wpt/tests/interfaces/svg-animations.idl b/test/wpt/tests/interfaces/svg-animations.idl
new file mode 100644
index 00000000000..b57e1b9eb51
--- /dev/null
+++ b/test/wpt/tests/interfaces/svg-animations.idl
@@ -0,0 +1,68 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: SVG Animations (https://svgwg.org/specs/animations/)
+
+[Exposed=Window]
+interface TimeEvent : Event {
+
+  readonly attribute WindowProxy? view;
+  readonly attribute long detail;
+
+  undefined initTimeEvent(DOMString typeArg, Window? viewArg, long detailArg);
+};
+
+[Exposed=Window]
+interface SVGAnimationElement : SVGElement {
+
+  readonly attribute SVGElement? targetElement;
+
+  attribute EventHandler onbegin;
+  attribute EventHandler onend;
+  attribute EventHandler onrepeat;
+
+  float getStartTime();
+  float getCurrentTime();
+  float getSimpleDuration();
+
+  undefined beginElement();
+  undefined beginElementAt(float offset);
+  undefined endElement();
+  undefined endElementAt(float offset);
+};
+
+SVGAnimationElement includes SVGTests;
+
+[Exposed=Window]
+interface SVGAnimateElement : SVGAnimationElement {
+};
+
+[Exposed=Window]
+interface SVGSetElement : SVGAnimationElement {
+};
+
+[Exposed=Window]
+interface SVGAnimateMotionElement : SVGAnimationElement {
+};
+
+[Exposed=Window]
+interface SVGMPathElement : SVGElement {
+};
+
+SVGMPathElement includes SVGURIReference;
+
+[Exposed=Window]
+interface SVGAnimateTransformElement : SVGAnimationElement {
+};
+
+[Exposed=Window]
+interface SVGDiscardElement : SVGAnimationElement {
+};
+
+partial interface SVGSVGElement {
+  undefined pauseAnimations();
+  undefined unpauseAnimations();
+  boolean animationsPaused();
+  float getCurrentTime();
+  undefined setCurrentTime(float seconds);
+};
diff --git a/test/wpt/tests/interfaces/testutils.idl b/test/wpt/tests/interfaces/testutils.idl
new file mode 100644
index 00000000000..c5b7efd0c40
--- /dev/null
+++ b/test/wpt/tests/interfaces/testutils.idl
@@ -0,0 +1,9 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Test Utils Standard (https://testutils.spec.whatwg.org/)
+
+[Exposed=(Window,Worker)]
+namespace TestUtils {
+  [NewObject] Promise<undefined> gc();
+};
diff --git a/test/wpt/tests/interfaces/text-detection-api.idl b/test/wpt/tests/interfaces/text-detection-api.idl
new file mode 100644
index 00000000000..95b642749f7
--- /dev/null
+++ b/test/wpt/tests/interfaces/text-detection-api.idl
@@ -0,0 +1,18 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Accelerated Text Detection in Images (https://wicg.github.io/shape-detection-api/text.html)
+
+[
+    Exposed=(Window,Worker),
+    SecureContext
+] interface TextDetector {
+    constructor();
+    Promise<sequence<DetectedText>> detect(ImageBitmapSource image);
+};
+
+dictionary DetectedText {
+  required DOMRectReadOnly boundingBox;
+  required DOMString rawValue;
+  required FrozenArray<Point2D> cornerPoints;
+};
diff --git a/test/wpt/tests/interfaces/touch-events.idl b/test/wpt/tests/interfaces/touch-events.idl
new file mode 100644
index 00000000000..9844f085381
--- /dev/null
+++ b/test/wpt/tests/interfaces/touch-events.idl
@@ -0,0 +1,79 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Touch Events - Level 2 (https://w3c.github.io/touch-events/)
+
+enum TouchType {
+    "direct",
+    "stylus"
+};
+
+dictionary TouchInit {
+    required long        identifier;
+    required EventTarget target;
+             double      clientX = 0;
+             double      clientY = 0;
+             double      screenX = 0;
+             double      screenY = 0;
+             double      pageX = 0;
+             double      pageY = 0;
+             float       radiusX = 0;
+             float       radiusY = 0;
+             float       rotationAngle = 0;
+             float       force = 0;
+             double      altitudeAngle = 0;
+             double      azimuthAngle = 0;
+             TouchType   touchType = "direct";
+};
+
+[Exposed=Window]
+interface Touch {
+    constructor(TouchInit touchInitDict);
+    readonly        attribute long        identifier;
+    readonly        attribute EventTarget target;
+    readonly        attribute double      screenX;
+    readonly        attribute double      screenY;
+    readonly        attribute double      clientX;
+    readonly        attribute double      clientY;
+    readonly        attribute double      pageX;
+    readonly        attribute double      pageY;
+    readonly        attribute float       radiusX;
+    readonly        attribute float       radiusY;
+    readonly        attribute float       rotationAngle;
+    readonly        attribute float       force;
+    readonly        attribute float       altitudeAngle;
+    readonly        attribute float       azimuthAngle;
+    readonly        attribute TouchType   touchType;
+};
+
+[Exposed=Window]
+interface TouchList {
+    readonly        attribute unsigned long length;
+    getter Touch? item (unsigned long index);
+};
+
+dictionary TouchEventInit : EventModifierInit {
+             sequence<Touch> touches = [];
+             sequence<Touch> targetTouches = [];
+             sequence<Touch> changedTouches = [];
+};
+
+[Exposed=Window]
+interface TouchEvent : UIEvent {
+    constructor(DOMString type, optional TouchEventInit eventInitDict = {});
+    readonly        attribute TouchList touches;
+    readonly        attribute TouchList targetTouches;
+    readonly        attribute TouchList changedTouches;
+    readonly        attribute boolean   altKey;
+    readonly        attribute boolean   metaKey;
+    readonly        attribute boolean   ctrlKey;
+    readonly        attribute boolean   shiftKey;
+    getter boolean getModifierState (DOMString keyArg);
+};
+
+partial interface mixin GlobalEventHandlers {
+                    attribute EventHandler ontouchstart;
+                    attribute EventHandler ontouchend;
+                    attribute EventHandler ontouchmove;
+                    attribute EventHandler ontouchcancel;
+};
diff --git a/test/wpt/tests/interfaces/trusted-types.idl b/test/wpt/tests/interfaces/trusted-types.idl
new file mode 100644
index 00000000000..23562381294
--- /dev/null
+++ b/test/wpt/tests/interfaces/trusted-types.idl
@@ -0,0 +1,71 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Trusted Types (https://w3c.github.io/trusted-types/dist/spec/)
+
+[Exposed=(Window,Worker)]
+interface TrustedHTML {
+  stringifier;
+  DOMString toJSON();
+  static TrustedHTML fromLiteral(object templateStringsArray);
+};
+
+[Exposed=(Window,Worker)]
+interface TrustedScript {
+  stringifier;
+  DOMString toJSON();
+  static TrustedScript fromLiteral(object templateStringsArray);
+};
+
+[Exposed=(Window,Worker)]
+interface TrustedScriptURL {
+  stringifier;
+  USVString toJSON();
+  static TrustedScriptURL fromLiteral(object templateStringsArray);
+};
+
+[Exposed=(Window,Worker)] interface TrustedTypePolicyFactory {
+    TrustedTypePolicy createPolicy(
+        DOMString policyName, optional TrustedTypePolicyOptions policyOptions = {});
+    boolean isHTML(any value);
+    boolean isScript(any value);
+    boolean isScriptURL(any value);
+    readonly attribute TrustedHTML emptyHTML;
+    readonly attribute TrustedScript emptyScript;
+    DOMString? getAttributeType(
+        DOMString tagName,
+        DOMString attribute,
+        optional DOMString elementNs = "",
+        optional DOMString attrNs = "");
+    DOMString? getPropertyType(
+        DOMString tagName,
+        DOMString property,
+        optional DOMString elementNs = "");
+    readonly attribute TrustedTypePolicy? defaultPolicy;
+};
+
+[Exposed=(Window,Worker)]
+interface TrustedTypePolicy {
+  readonly attribute DOMString name;
+  TrustedHTML createHTML(DOMString input, any... arguments);
+  TrustedScript createScript(DOMString input, any... arguments);
+  TrustedScriptURL createScriptURL(DOMString input, any... arguments);
+};
+
+dictionary TrustedTypePolicyOptions {
+   CreateHTMLCallback? createHTML;
+   CreateScriptCallback? createScript;
+   CreateScriptURLCallback? createScriptURL;
+};
+callback CreateHTMLCallback = DOMString (DOMString input, any... arguments);
+callback CreateScriptCallback = DOMString (DOMString input, any... arguments);
+callback CreateScriptURLCallback = USVString (DOMString input, any... arguments);
+
+typedef [StringContext=TrustedHTML] DOMString HTMLString;
+typedef [StringContext=TrustedScript] DOMString ScriptString;
+typedef [StringContext=TrustedScriptURL] USVString ScriptURLString;
+typedef (TrustedHTML or TrustedScript or TrustedScriptURL) TrustedType;
+
+partial interface mixin WindowOrWorkerGlobalScope {
+  readonly attribute TrustedTypePolicyFactory trustedTypes;
+};
diff --git a/test/wpt/tests/interfaces/ua-client-hints.idl b/test/wpt/tests/interfaces/ua-client-hints.idl
new file mode 100644
index 00000000000..f5070a0e090
--- /dev/null
+++ b/test/wpt/tests/interfaces/ua-client-hints.idl
@@ -0,0 +1,44 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: User-Agent Client Hints (https://wicg.github.io/ua-client-hints/)
+
+dictionary NavigatorUABrandVersion {
+  DOMString brand;
+  DOMString version;
+};
+
+dictionary UADataValues {
+  sequence<NavigatorUABrandVersion> brands;
+  boolean mobile;
+  DOMString architecture;
+  DOMString bitness;
+  DOMString model;
+  DOMString platform;
+  DOMString platformVersion;
+  DOMString uaFullVersion; // deprecated in favor of fullVersionList
+  boolean wow64;
+  sequence<NavigatorUABrandVersion> fullVersionList;
+};
+
+dictionary UALowEntropyJSON {
+  sequence<NavigatorUABrandVersion> brands;
+  boolean mobile;
+  DOMString platform;
+};
+
+[Exposed=(Window,Worker)]
+interface NavigatorUAData {
+  readonly attribute FrozenArray<NavigatorUABrandVersion> brands;
+  readonly attribute boolean mobile;
+  readonly attribute DOMString platform;
+  Promise<UADataValues> getHighEntropyValues(sequence<DOMString> hints);
+  UALowEntropyJSON toJSON();
+};
+
+interface mixin NavigatorUA {
+  [SecureContext] readonly attribute NavigatorUAData userAgentData;
+};
+
+Navigator includes NavigatorUA;
+WorkerNavigator includes NavigatorUA;
diff --git a/test/wpt/tests/interfaces/uievents.idl b/test/wpt/tests/interfaces/uievents.idl
new file mode 100644
index 00000000000..5fdc812e700
--- /dev/null
+++ b/test/wpt/tests/interfaces/uievents.idl
@@ -0,0 +1,248 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: UI Events (https://w3c.github.io/uievents/)
+
+[Exposed=Window]
+interface UIEvent : Event {
+  constructor(DOMString type, optional UIEventInit eventInitDict = {});
+  readonly attribute Window? view;
+  readonly attribute long detail;
+};
+
+dictionary UIEventInit : EventInit {
+  Window? view = null;
+  long detail = 0;
+};
+
+[Exposed=Window]
+interface FocusEvent : UIEvent {
+  constructor(DOMString type, optional FocusEventInit eventInitDict = {});
+  readonly attribute EventTarget? relatedTarget;
+};
+
+dictionary FocusEventInit : UIEventInit {
+  EventTarget? relatedTarget = null;
+};
+
+[Exposed=Window]
+interface MouseEvent : UIEvent {
+  constructor(DOMString type, optional MouseEventInit eventInitDict = {});
+  readonly attribute long screenX;
+  readonly attribute long screenY;
+  readonly attribute long clientX;
+  readonly attribute long clientY;
+
+  readonly attribute boolean ctrlKey;
+  readonly attribute boolean shiftKey;
+  readonly attribute boolean altKey;
+  readonly attribute boolean metaKey;
+
+  readonly attribute short button;
+  readonly attribute unsigned short buttons;
+
+  readonly attribute EventTarget? relatedTarget;
+
+  boolean getModifierState(DOMString keyArg);
+};
+
+dictionary MouseEventInit : EventModifierInit {
+  long screenX = 0;
+  long screenY = 0;
+  long clientX = 0;
+  long clientY = 0;
+
+  short button = 0;
+  unsigned short buttons = 0;
+  EventTarget? relatedTarget = null;
+};
+
+dictionary EventModifierInit : UIEventInit {
+  boolean ctrlKey = false;
+  boolean shiftKey = false;
+  boolean altKey = false;
+  boolean metaKey = false;
+
+  boolean modifierAltGraph = false;
+  boolean modifierCapsLock = false;
+  boolean modifierFn = false;
+  boolean modifierFnLock = false;
+  boolean modifierHyper = false;
+  boolean modifierNumLock = false;
+  boolean modifierScrollLock = false;
+  boolean modifierSuper = false;
+  boolean modifierSymbol = false;
+  boolean modifierSymbolLock = false;
+};
+
+[Exposed=Window]
+interface WheelEvent : MouseEvent {
+  constructor(DOMString type, optional WheelEventInit eventInitDict = {});
+  // DeltaModeCode
+  const unsigned long DOM_DELTA_PIXEL = 0x00;
+  const unsigned long DOM_DELTA_LINE  = 0x01;
+  const unsigned long DOM_DELTA_PAGE  = 0x02;
+
+  readonly attribute double deltaX;
+  readonly attribute double deltaY;
+  readonly attribute double deltaZ;
+  readonly attribute unsigned long deltaMode;
+};
+
+dictionary WheelEventInit : MouseEventInit {
+  double deltaX = 0.0;
+  double deltaY = 0.0;
+  double deltaZ = 0.0;
+  unsigned long deltaMode = 0;
+};
+
+[Exposed=Window]
+interface InputEvent : UIEvent {
+  constructor(DOMString type, optional InputEventInit eventInitDict = {});
+  readonly attribute DOMString? data;
+  readonly attribute boolean isComposing;
+  readonly attribute DOMString inputType;
+};
+
+dictionary InputEventInit : UIEventInit {
+  DOMString? data = null;
+  boolean isComposing = false;
+  DOMString inputType = "";
+};
+
+[Exposed=Window]
+interface KeyboardEvent : UIEvent {
+  constructor(DOMString type, optional KeyboardEventInit eventInitDict = {});
+  // KeyLocationCode
+  const unsigned long DOM_KEY_LOCATION_STANDARD = 0x00;
+  const unsigned long DOM_KEY_LOCATION_LEFT = 0x01;
+  const unsigned long DOM_KEY_LOCATION_RIGHT = 0x02;
+  const unsigned long DOM_KEY_LOCATION_NUMPAD = 0x03;
+
+  readonly attribute DOMString key;
+  readonly attribute DOMString code;
+  readonly attribute unsigned long location;
+
+  readonly attribute boolean ctrlKey;
+  readonly attribute boolean shiftKey;
+  readonly attribute boolean altKey;
+  readonly attribute boolean metaKey;
+
+  readonly attribute boolean repeat;
+  readonly attribute boolean isComposing;
+
+  boolean getModifierState(DOMString keyArg);
+};
+
+dictionary KeyboardEventInit : EventModifierInit {
+  DOMString key = "";
+  DOMString code = "";
+  unsigned long location = 0;
+  boolean repeat = false;
+  boolean isComposing = false;
+};
+
+[Exposed=Window]
+interface CompositionEvent : UIEvent {
+  constructor(DOMString type, optional CompositionEventInit eventInitDict = {});
+  readonly attribute DOMString data;
+};
+
+dictionary CompositionEventInit : UIEventInit {
+  DOMString data = "";
+};
+
+partial interface UIEvent {
+  // Deprecated in this specification
+  undefined initUIEvent(DOMString typeArg,
+    optional boolean bubblesArg = false,
+    optional boolean cancelableArg = false,
+    optional Window? viewArg = null,
+    optional long detailArg = 0);
+};
+
+partial interface MouseEvent {
+  // Deprecated in this specification
+  undefined initMouseEvent(DOMString typeArg,
+    optional boolean bubblesArg = false,
+    optional boolean cancelableArg = false,
+    optional Window? viewArg = null,
+    optional long detailArg = 0,
+    optional long screenXArg = 0,
+    optional long screenYArg = 0,
+    optional long clientXArg = 0,
+    optional long clientYArg = 0,
+    optional boolean ctrlKeyArg = false,
+    optional boolean altKeyArg = false,
+    optional boolean shiftKeyArg = false,
+    optional boolean metaKeyArg = false,
+    optional short buttonArg = 0,
+    optional EventTarget? relatedTargetArg = null);
+};
+
+partial interface KeyboardEvent {
+  // Originally introduced (and deprecated) in this specification
+  undefined initKeyboardEvent(DOMString typeArg,
+    optional boolean bubblesArg = false,
+    optional boolean cancelableArg = false,
+    optional Window? viewArg = null,
+    optional DOMString keyArg = "",
+    optional unsigned long locationArg = 0,
+    optional boolean ctrlKey = false,
+    optional boolean altKey = false,
+    optional boolean shiftKey = false,
+    optional boolean metaKey = false);
+};
+
+partial interface CompositionEvent {
+  // Originally introduced (and deprecated) in this specification
+  undefined initCompositionEvent(DOMString typeArg,
+    optional boolean bubblesArg = false,
+    optional boolean cancelableArg = false,
+    optional WindowProxy? viewArg = null,
+    optional DOMString dataArg = "");
+};
+
+partial interface UIEvent {
+  // The following support legacy user agents
+  readonly attribute unsigned long which;
+};
+
+partial dictionary UIEventInit {
+  unsigned long which = 0;
+};
+
+partial interface KeyboardEvent {
+  // The following support legacy user agents
+  readonly attribute unsigned long charCode;
+  readonly attribute unsigned long keyCode;
+};
+
+partial dictionary KeyboardEventInit {
+  // The following support legacy user agents
+  unsigned long charCode = 0;
+  unsigned long keyCode = 0;
+};
+
+[Exposed=Window]
+interface MutationEvent : Event {
+  // attrChangeType
+  const unsigned short MODIFICATION = 1;
+  const unsigned short ADDITION = 2;
+  const unsigned short REMOVAL = 3;
+
+  readonly attribute Node? relatedNode;
+  readonly attribute DOMString prevValue;
+  readonly attribute DOMString newValue;
+  readonly attribute DOMString attrName;
+  readonly attribute unsigned short attrChange;
+
+  undefined initMutationEvent(DOMString typeArg,
+    optional boolean bubblesArg = false,
+    optional boolean cancelableArg = false,
+    optional Node? relatedNodeArg = null,
+    optional DOMString prevValueArg = "",
+    optional DOMString newValueArg = "",
+    optional DOMString attrNameArg = "",
+    optional unsigned short attrChangeArg = 0);
+};
diff --git a/test/wpt/tests/interfaces/urlpattern.idl b/test/wpt/tests/interfaces/urlpattern.idl
new file mode 100644
index 00000000000..e342eb50abd
--- /dev/null
+++ b/test/wpt/tests/interfaces/urlpattern.idl
@@ -0,0 +1,59 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: URLPattern API (https://wicg.github.io/urlpattern/)
+
+typedef (USVString or URLPatternInit) URLPatternInput;
+
+[Exposed=(Window,Worker)]
+interface URLPattern {
+  constructor(URLPatternInput input, USVString baseURL, optional URLPatternOptions options = {});
+  constructor(optional URLPatternInput input = {}, optional URLPatternOptions options = {});
+
+  boolean test(optional URLPatternInput input = {}, optional USVString baseURL);
+
+  URLPatternResult? exec(optional URLPatternInput input = {}, optional USVString baseURL);
+
+  readonly attribute USVString protocol;
+  readonly attribute USVString username;
+  readonly attribute USVString password;
+  readonly attribute USVString hostname;
+  readonly attribute USVString port;
+  readonly attribute USVString pathname;
+  readonly attribute USVString search;
+  readonly attribute USVString hash;
+};
+
+dictionary URLPatternInit {
+  USVString protocol;
+  USVString username;
+  USVString password;
+  USVString hostname;
+  USVString port;
+  USVString pathname;
+  USVString search;
+  USVString hash;
+  USVString baseURL;
+};
+
+dictionary URLPatternOptions {
+  boolean ignoreCase = false;
+};
+
+dictionary URLPatternResult {
+  sequence<URLPatternInput> inputs;
+
+  URLPatternComponentResult protocol;
+  URLPatternComponentResult username;
+  URLPatternComponentResult password;
+  URLPatternComponentResult hostname;
+  URLPatternComponentResult port;
+  URLPatternComponentResult pathname;
+  URLPatternComponentResult search;
+  URLPatternComponentResult hash;
+};
+
+dictionary URLPatternComponentResult {
+  USVString input;
+  record<USVString, (USVString or undefined)> groups;
+};
diff --git a/test/wpt/tests/interfaces/user-timing.idl b/test/wpt/tests/interfaces/user-timing.idl
new file mode 100644
index 00000000000..28ee8aac2b1
--- /dev/null
+++ b/test/wpt/tests/interfaces/user-timing.idl
@@ -0,0 +1,34 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: User Timing Level 3 (https://w3c.github.io/user-timing/)
+
+dictionary PerformanceMarkOptions {
+    any detail;
+    DOMHighResTimeStamp startTime;
+};
+
+dictionary PerformanceMeasureOptions {
+    any detail;
+    (DOMString or DOMHighResTimeStamp) start;
+    DOMHighResTimeStamp duration;
+    (DOMString or DOMHighResTimeStamp) end;
+};
+
+partial interface Performance {
+    PerformanceMark mark(DOMString markName, optional PerformanceMarkOptions markOptions = {});
+    undefined clearMarks(optional DOMString markName);
+    PerformanceMeasure measure(DOMString measureName, optional (DOMString or PerformanceMeasureOptions) startOrMeasureOptions = {}, optional DOMString endMark);
+    undefined clearMeasures(optional DOMString measureName);
+};
+
+[Exposed=(Window,Worker)]
+interface PerformanceMark : PerformanceEntry {
+  constructor(DOMString markName, optional PerformanceMarkOptions markOptions = {});
+  readonly attribute any detail;
+};
+
+[Exposed=(Window,Worker)]
+interface PerformanceMeasure : PerformanceEntry {
+  readonly attribute any detail;
+};
diff --git a/test/wpt/tests/interfaces/vibration.idl b/test/wpt/tests/interfaces/vibration.idl
new file mode 100644
index 00000000000..22ab1c47df0
--- /dev/null
+++ b/test/wpt/tests/interfaces/vibration.idl
@@ -0,0 +1,10 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Vibration API (Second Edition) (https://w3c.github.io/vibration/)
+
+typedef (unsigned long or sequence<unsigned long>) VibratePattern;
+
+partial interface Navigator {
+    boolean vibrate (VibratePattern pattern);
+};
diff --git a/test/wpt/tests/interfaces/video-rvfc.idl b/test/wpt/tests/interfaces/video-rvfc.idl
new file mode 100644
index 00000000000..adb4ef2301d
--- /dev/null
+++ b/test/wpt/tests/interfaces/video-rvfc.idl
@@ -0,0 +1,27 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: HTMLVideoElement.requestVideoFrameCallback() (https://wicg.github.io/video-rvfc/)
+
+dictionary VideoFrameCallbackMetadata {
+  required DOMHighResTimeStamp presentationTime;
+  required DOMHighResTimeStamp expectedDisplayTime;
+
+  required unsigned long width;
+  required unsigned long height;
+  required double mediaTime;
+
+  required unsigned long presentedFrames;
+  double processingDuration;
+
+  DOMHighResTimeStamp captureTime;
+  DOMHighResTimeStamp receiveTime;
+  unsigned long rtpTimestamp;
+};
+
+callback VideoFrameRequestCallback = undefined(DOMHighResTimeStamp now, VideoFrameCallbackMetadata metadata);
+
+partial interface HTMLVideoElement {
+    unsigned long requestVideoFrameCallback(VideoFrameRequestCallback callback);
+    undefined cancelVideoFrameCallback(unsigned long handle);
+};
diff --git a/test/wpt/tests/interfaces/virtual-keyboard.idl b/test/wpt/tests/interfaces/virtual-keyboard.idl
new file mode 100644
index 00000000000..74dafc5fb34
--- /dev/null
+++ b/test/wpt/tests/interfaces/virtual-keyboard.idl
@@ -0,0 +1,21 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: VirtualKeyboard API (https://w3c.github.io/virtual-keyboard/)
+
+partial interface Navigator {
+    [SecureContext, SameObject] readonly attribute VirtualKeyboard virtualKeyboard;
+};
+
+[Exposed=Window, SecureContext]
+interface VirtualKeyboard : EventTarget {
+    undefined show();
+    undefined hide();
+    readonly attribute DOMRect boundingRect;
+    attribute boolean overlaysContent;
+    attribute EventHandler ongeometrychange;
+};
+
+partial interface mixin ElementContentEditable {
+     [CEReactions] attribute DOMString virtualKeyboardPolicy;
+};
diff --git a/test/wpt/tests/interfaces/virtual-keyboard.tentative.idl b/test/wpt/tests/interfaces/virtual-keyboard.tentative.idl
new file mode 100644
index 00000000000..2991d242e6f
--- /dev/null
+++ b/test/wpt/tests/interfaces/virtual-keyboard.tentative.idl
@@ -0,0 +1,15 @@
+// Explainers:
+// https://github.com/MicrosoftEdge/MSEdgeExplainers/blob/main/VirtualKeyboardPolicy/explainer.md
+// https://github.com/MicrosoftEdge/MSEdgeExplainers/blob/main/VirtualKeyboardAPI/explainer.md
+
+partial interface Navigator {
+  [SecureContext, SameObject] readonly attribute VirtualKeyboard virtualKeyboard;
+};
+
+[SecureContext, Exposed=Window] interface VirtualKeyboard : EventTarget {
+    undefined show();
+    undefined hide();
+    readonly attribute DOMRect boundingRect;
+    attribute boolean overlaysContent;
+    attribute EventHandler ongeometrychange;
+};
diff --git a/test/wpt/tests/interfaces/wai-aria.idl b/test/wpt/tests/interfaces/wai-aria.idl
new file mode 100644
index 00000000000..3434bf7c2d3
--- /dev/null
+++ b/test/wpt/tests/interfaces/wai-aria.idl
@@ -0,0 +1,59 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Accessible Rich Internet Applications (WAI-ARIA) 1.3 (https://w3c.github.io/aria/)
+
+interface mixin ARIAMixin {
+  [CEReactions] attribute DOMString? role;
+  [CEReactions] attribute Element? ariaActiveDescendantElement;
+  [CEReactions] attribute DOMString? ariaAtomic;
+  [CEReactions] attribute DOMString? ariaAutoComplete;
+  [CEReactions] attribute DOMString? ariaBusy;
+  [CEReactions] attribute DOMString? ariaChecked;
+  [CEReactions] attribute DOMString? ariaColCount;
+  [CEReactions] attribute DOMString? ariaColIndex;
+  [CEReactions] attribute DOMString? ariaColIndexText;
+  [CEReactions] attribute DOMString? ariaColSpan;
+  [CEReactions] attribute FrozenArray<Element>? ariaControlsElements;
+  [CEReactions] attribute DOMString? ariaCurrent;
+  [CEReactions] attribute FrozenArray<Element>? ariaDescribedByElements;
+  [CEReactions] attribute DOMString? ariaDescription;
+  [CEReactions] attribute FrozenArray<Element>? ariaDetailsElements;
+  [CEReactions] attribute DOMString? ariaDisabled;
+  [CEReactions] attribute FrozenArray<Element>? ariaErrorMessageElements;
+  [CEReactions] attribute DOMString? ariaExpanded;
+  [CEReactions] attribute FrozenArray<Element>? ariaFlowToElements;
+  [CEReactions] attribute DOMString? ariaHasPopup;
+  [CEReactions] attribute DOMString? ariaHidden;
+  [CEReactions] attribute DOMString? ariaInvalid;
+  [CEReactions] attribute DOMString? ariaKeyShortcuts;
+  [CEReactions] attribute DOMString? ariaLabel;
+  [CEReactions] attribute FrozenArray<Element>? ariaLabelledByElements;
+  [CEReactions] attribute DOMString? ariaLevel;
+  [CEReactions] attribute DOMString? ariaLive;
+  [CEReactions] attribute DOMString? ariaModal;
+  [CEReactions] attribute DOMString? ariaMultiLine;
+  [CEReactions] attribute DOMString? ariaMultiSelectable;
+  [CEReactions] attribute DOMString? ariaOrientation;
+  [CEReactions] attribute FrozenArray<Element>? ariaOwnsElements;
+  [CEReactions] attribute DOMString? ariaPlaceholder;
+  [CEReactions] attribute DOMString? ariaPosInSet;
+  [CEReactions] attribute DOMString? ariaPressed;
+  [CEReactions] attribute DOMString? ariaReadOnly;
+
+  [CEReactions] attribute DOMString? ariaRequired;
+  [CEReactions] attribute DOMString? ariaRoleDescription;
+  [CEReactions] attribute DOMString? ariaRowCount;
+  [CEReactions] attribute DOMString? ariaRowIndex;
+  [CEReactions] attribute DOMString? ariaRowIndexText;
+  [CEReactions] attribute DOMString? ariaRowSpan;
+  [CEReactions] attribute DOMString? ariaSelected;
+  [CEReactions] attribute DOMString? ariaSetSize;
+  [CEReactions] attribute DOMString? ariaSort;
+  [CEReactions] attribute DOMString? ariaValueMax;
+  [CEReactions] attribute DOMString? ariaValueMin;
+  [CEReactions] attribute DOMString? ariaValueNow;
+  [CEReactions] attribute DOMString? ariaValueText;
+};
+
+Element includes ARIAMixin;
diff --git a/test/wpt/tests/interfaces/wasm-js-api.idl b/test/wpt/tests/interfaces/wasm-js-api.idl
new file mode 100644
index 00000000000..141af90fd2d
--- /dev/null
+++ b/test/wpt/tests/interfaces/wasm-js-api.idl
@@ -0,0 +1,110 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: WebAssembly JavaScript Interface (https://webassembly.github.io/spec/js-api/)
+
+dictionary WebAssemblyInstantiatedSource {
+    required Module module;
+    required Instance instance;
+};
+
+[Exposed=(Window,Worker,Worklet)]
+namespace WebAssembly {
+    boolean validate(BufferSource bytes);
+    Promise<Module> compile(BufferSource bytes);
+
+    Promise<WebAssemblyInstantiatedSource> instantiate(
+        BufferSource bytes, optional object importObject);
+
+    Promise<Instance> instantiate(
+        Module moduleObject, optional object importObject);
+};
+
+enum ImportExportKind {
+  "function",
+  "table",
+  "memory",
+  "global"
+};
+
+dictionary ModuleExportDescriptor {
+  required USVString name;
+  required ImportExportKind kind;
+  // Note: Other fields such as signature may be added in the future.
+};
+
+dictionary ModuleImportDescriptor {
+  required USVString module;
+  required USVString name;
+  required ImportExportKind kind;
+};
+
+[LegacyNamespace=WebAssembly, Exposed=(Window,Worker,Worklet)]
+interface Module {
+  constructor(BufferSource bytes);
+  static sequence<ModuleExportDescriptor> exports(Module moduleObject);
+  static sequence<ModuleImportDescriptor> imports(Module moduleObject);
+  static sequence<ArrayBuffer> customSections(Module moduleObject, DOMString sectionName);
+};
+
+[LegacyNamespace=WebAssembly, Exposed=(Window,Worker,Worklet)]
+interface Instance {
+  constructor(Module module, optional object importObject);
+  readonly attribute object exports;
+};
+
+dictionary MemoryDescriptor {
+  required [EnforceRange] unsigned long initial;
+  [EnforceRange] unsigned long maximum;
+};
+
+[LegacyNamespace=WebAssembly, Exposed=(Window,Worker,Worklet)]
+interface Memory {
+  constructor(MemoryDescriptor descriptor);
+  unsigned long grow([EnforceRange] unsigned long delta);
+  readonly attribute ArrayBuffer buffer;
+};
+
+enum TableKind {
+  "externref",
+  "anyfunc",
+  // Note: More values may be added in future iterations,
+  // e.g., typed function references, typed GC references
+};
+
+dictionary TableDescriptor {
+  required TableKind element;
+  required [EnforceRange] unsigned long initial;
+  [EnforceRange] unsigned long maximum;
+};
+
+[LegacyNamespace=WebAssembly, Exposed=(Window,Worker,Worklet)]
+interface Table {
+  constructor(TableDescriptor descriptor, optional any value);
+  unsigned long grow([EnforceRange] unsigned long delta, optional any value);
+  any get([EnforceRange] unsigned long index);
+  undefined set([EnforceRange] unsigned long index, optional any value);
+  readonly attribute unsigned long length;
+};
+
+enum ValueType {
+  "i32",
+  "i64",
+  "f32",
+  "f64",
+  "v128",
+  "externref",
+  "anyfunc",
+};
+
+dictionary GlobalDescriptor {
+  required ValueType value;
+  boolean mutable = false;
+};
+
+[LegacyNamespace=WebAssembly, Exposed=(Window,Worker,Worklet)]
+interface Global {
+  constructor(GlobalDescriptor descriptor, optional any v);
+  any valueOf();
+  attribute any value;
+};
diff --git a/test/wpt/tests/interfaces/wasm-web-api.idl b/test/wpt/tests/interfaces/wasm-web-api.idl
new file mode 100644
index 00000000000..088c8ee3a39
--- /dev/null
+++ b/test/wpt/tests/interfaces/wasm-web-api.idl
@@ -0,0 +1,11 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: WebAssembly Web API (https://webassembly.github.io/spec/web-api/)
+
+[Exposed=(Window,Worker)]
+partial namespace WebAssembly {
+  Promise<Module> compileStreaming(Promise<Response> source);
+  Promise<WebAssemblyInstantiatedSource> instantiateStreaming(
+      Promise<Response> source, optional object importObject);
+};
diff --git a/test/wpt/tests/interfaces/web-animations-2.idl b/test/wpt/tests/interfaces/web-animations-2.idl
new file mode 100644
index 00000000000..61df2cd1518
--- /dev/null
+++ b/test/wpt/tests/interfaces/web-animations-2.idl
@@ -0,0 +1,101 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Web Animations Level 2 (https://drafts.csswg.org/web-animations-2/)
+
+[Exposed=Window]
+partial interface AnimationTimeline {
+    readonly attribute CSSNumberish? duration;
+    Animation play (optional AnimationEffect? effect = null);
+};
+
+[Exposed=Window]
+partial interface Animation {
+    attribute CSSNumberish?       startTime;
+    attribute CSSNumberish?       currentTime;
+};
+
+[Exposed=Window]
+partial interface AnimationEffect {
+    // Timing hierarchy
+    readonly attribute GroupEffect?     parent;
+    readonly attribute AnimationEffect? previousSibling;
+    readonly attribute AnimationEffect? nextSibling;
+
+    undefined before (AnimationEffect... effects);
+    undefined after (AnimationEffect... effects);
+    undefined replace (AnimationEffect... effects);
+    undefined remove ();
+};
+
+partial dictionary EffectTiming {
+    double delay;
+    double endDelay;
+    double playbackRate = 1.0;
+    (unrestricted double or CSSNumericValue or DOMString) duration = "auto";
+};
+
+partial dictionary OptionalEffectTiming {
+    double playbackRate;
+};
+
+partial dictionary ComputedEffectTiming {
+    CSSNumberish         startTime;
+    CSSNumberish         endTime;
+    CSSNumberish         activeDuration;
+    CSSNumberish?        localTime;
+};
+
+[Exposed=Window]
+interface GroupEffect {
+  constructor(sequence<AnimationEffect>? children,
+              optional (unrestricted double or EffectTiming) timing = {});
+
+  readonly attribute AnimationNodeList  children;
+  readonly attribute AnimationEffect?   firstChild;
+  readonly attribute AnimationEffect?   lastChild;
+  GroupEffect clone ();
+
+  undefined prepend (AnimationEffect... effects);
+  undefined append (AnimationEffect... effects);
+};
+
+[Exposed=Window]
+interface AnimationNodeList {
+    readonly attribute unsigned long length;
+    getter AnimationEffect? item (unsigned long index);
+};
+
+[Exposed=Window]
+interface SequenceEffect : GroupEffect {
+  constructor(sequence<AnimationEffect>? children,
+              optional (unrestricted double or EffectTiming) timing = {});
+
+  SequenceEffect clone ();
+};
+
+partial interface KeyframeEffect {
+    attribute IterationCompositeOperation    iterationComposite;
+};
+
+partial dictionary KeyframeEffectOptions {
+    IterationCompositeOperation iterationComposite = "replace";
+};
+
+enum IterationCompositeOperation { "replace", "accumulate" };
+
+callback EffectCallback = undefined (double? progress,
+                                (Element or CSSPseudoElement) currentTarget,
+                                Animation animation);
+
+[Exposed=Window]
+interface AnimationPlaybackEvent : Event {
+    constructor(DOMString type, optional AnimationPlaybackEventInit
+    eventInitDict = {});
+    readonly attribute CSSNumberish? currentTime;
+    readonly attribute CSSNumberish? timelineTime;
+};
+dictionary AnimationPlaybackEventInit : EventInit {
+    CSSNumberish? currentTime = null;
+    CSSNumberish? timelineTime = null;
+};
diff --git a/test/wpt/tests/interfaces/web-animations.idl b/test/wpt/tests/interfaces/web-animations.idl
new file mode 100644
index 00000000000..ed612302a47
--- /dev/null
+++ b/test/wpt/tests/interfaces/web-animations.idl
@@ -0,0 +1,150 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Web Animations (https://drafts.csswg.org/web-animations-1/)
+
+[Exposed=Window]
+interface AnimationTimeline {
+    readonly attribute double? currentTime;
+};
+
+dictionary DocumentTimelineOptions {
+  DOMHighResTimeStamp originTime = 0;
+};
+
+[Exposed=Window]
+interface DocumentTimeline : AnimationTimeline {
+  constructor(optional DocumentTimelineOptions options = {});
+};
+
+[Exposed=Window]
+interface Animation : EventTarget {
+    constructor(optional AnimationEffect? effect = null,
+                optional AnimationTimeline? timeline);
+             attribute DOMString                id;
+             attribute AnimationEffect?         effect;
+             attribute AnimationTimeline?       timeline;
+             attribute double                   playbackRate;
+    readonly attribute AnimationPlayState       playState;
+    readonly attribute AnimationReplaceState    replaceState;
+    readonly attribute boolean                  pending;
+    readonly attribute Promise<Animation>       ready;
+    readonly attribute Promise<Animation>       finished;
+             attribute EventHandler             onfinish;
+             attribute EventHandler             oncancel;
+             attribute EventHandler             onremove;
+    undefined cancel();
+    undefined finish();
+    undefined play();
+    undefined pause();
+    undefined updatePlaybackRate(double playbackRate);
+    undefined reverse();
+    undefined persist();
+    [CEReactions]
+    undefined commitStyles();
+};
+
+enum AnimationPlayState { "idle", "running", "paused", "finished" };
+
+enum AnimationReplaceState { "active", "removed", "persisted" };
+
+[Exposed=Window]
+interface AnimationEffect {
+    EffectTiming         getTiming();
+    ComputedEffectTiming getComputedTiming();
+    undefined            updateTiming(optional OptionalEffectTiming timing = {});
+};
+
+dictionary EffectTiming {
+    FillMode                           fill = "auto";
+    double                             iterationStart = 0.0;
+    unrestricted double                iterations = 1.0;
+    PlaybackDirection                  direction = "normal";
+    DOMString                          easing = "linear";
+};
+
+dictionary OptionalEffectTiming {
+    double                             delay;
+    double                             endDelay;
+    FillMode                           fill;
+    double                             iterationStart;
+    unrestricted double                iterations;
+    (unrestricted double or DOMString) duration;
+    PlaybackDirection                  direction;
+    DOMString                          easing;
+};
+
+enum FillMode { "none", "forwards", "backwards", "both", "auto" };
+
+enum PlaybackDirection { "normal", "reverse", "alternate", "alternate-reverse" };
+
+dictionary ComputedEffectTiming : EffectTiming {
+    double?              progress;
+    unrestricted double? currentIteration;
+};
+
+[Exposed=Window]
+interface KeyframeEffect : AnimationEffect {
+    constructor(Element? target,
+                object? keyframes,
+                optional (unrestricted double or KeyframeEffectOptions) options = {});
+    constructor(KeyframeEffect source);
+    attribute Element?           target;
+    attribute CSSOMString?       pseudoElement;
+    attribute CompositeOperation composite;
+    sequence<object> getKeyframes();
+    undefined        setKeyframes(object? keyframes);
+};
+
+dictionary BaseComputedKeyframe {
+     double?                  offset = null;
+     double                   computedOffset;
+     DOMString                easing = "linear";
+     CompositeOperationOrAuto composite = "auto";
+};
+
+dictionary BasePropertyIndexedKeyframe {
+    (double? or sequence<double?>)                         offset = [];
+    (DOMString or sequence<DOMString>)                     easing = [];
+    (CompositeOperationOrAuto or sequence<CompositeOperationOrAuto>) composite = [];
+};
+
+dictionary BaseKeyframe {
+    double?                  offset = null;
+    DOMString                easing = "linear";
+    CompositeOperationOrAuto composite = "auto";
+};
+
+dictionary KeyframeEffectOptions : EffectTiming {
+    CompositeOperation composite = "replace";
+    CSSOMString?       pseudoElement = null;
+};
+
+enum CompositeOperation { "replace", "add", "accumulate" };
+
+enum CompositeOperationOrAuto { "replace", "add", "accumulate", "auto" };
+
+interface mixin Animatable {
+    Animation           animate(object? keyframes,
+                                optional (unrestricted double or KeyframeAnimationOptions) options = {});
+    sequence<Animation> getAnimations(optional GetAnimationsOptions options = {});
+};
+
+dictionary KeyframeAnimationOptions : KeyframeEffectOptions {
+    DOMString id = "";
+    AnimationTimeline? timeline;
+};
+
+dictionary GetAnimationsOptions {
+    boolean subtree = false;
+};
+
+partial interface Document {
+    readonly attribute DocumentTimeline timeline;
+};
+
+partial interface mixin DocumentOrShadowRoot {
+    sequence<Animation> getAnimations();
+};
+
+Element includes Animatable;
diff --git a/test/wpt/tests/interfaces/web-app-launch.idl b/test/wpt/tests/interfaces/web-app-launch.idl
new file mode 100644
index 00000000000..c3b6e39f3fa
--- /dev/null
+++ b/test/wpt/tests/interfaces/web-app-launch.idl
@@ -0,0 +1,19 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Web App Launch Handler API (https://wicg.github.io/web-app-launch/)
+
+[Exposed=Window] interface LaunchParams {
+  readonly attribute DOMString? targetURL;
+  readonly attribute FrozenArray<FileSystemHandle> files;
+};
+
+callback LaunchConsumer = any (LaunchParams params);
+
+partial interface Window {
+  readonly attribute LaunchQueue launchQueue;
+};
+
+[Exposed=Window] interface LaunchQueue {
+  undefined setConsumer(LaunchConsumer consumer);
+};
diff --git a/test/wpt/tests/interfaces/web-bluetooth.idl b/test/wpt/tests/interfaces/web-bluetooth.idl
new file mode 100644
index 00000000000..21c237040eb
--- /dev/null
+++ b/test/wpt/tests/interfaces/web-bluetooth.idl
@@ -0,0 +1,251 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Web Bluetooth (https://webbluetoothcg.github.io/web-bluetooth/)
+
+dictionary BluetoothDataFilterInit {
+  BufferSource dataPrefix;
+  BufferSource mask;
+};
+
+dictionary BluetoothManufacturerDataFilterInit : BluetoothDataFilterInit {
+  required [EnforceRange] unsigned short companyIdentifier;
+};
+
+dictionary BluetoothServiceDataFilterInit : BluetoothDataFilterInit {
+  required BluetoothServiceUUID service;
+};
+
+dictionary BluetoothLEScanFilterInit {
+  sequence<BluetoothServiceUUID> services;
+  DOMString name;
+  DOMString namePrefix;
+  sequence<BluetoothManufacturerDataFilterInit> manufacturerData;
+  sequence<BluetoothServiceDataFilterInit> serviceData;
+};
+
+dictionary RequestDeviceOptions {
+  sequence<BluetoothLEScanFilterInit> filters;
+  sequence<BluetoothServiceUUID> optionalServices = [];
+  sequence<unsigned short> optionalManufacturerData = [];
+  boolean acceptAllDevices = false;
+};
+
+[Exposed=Window, SecureContext]
+interface Bluetooth : EventTarget {
+  Promise<boolean> getAvailability();
+  attribute EventHandler onavailabilitychanged;
+  [SameObject]
+  readonly attribute BluetoothDevice? referringDevice;
+  Promise<sequence<BluetoothDevice>> getDevices();
+  Promise<BluetoothDevice> requestDevice(optional RequestDeviceOptions options = {});
+};
+
+Bluetooth includes BluetoothDeviceEventHandlers;
+Bluetooth includes CharacteristicEventHandlers;
+Bluetooth includes ServiceEventHandlers;
+
+dictionary BluetoothPermissionDescriptor : PermissionDescriptor {
+  DOMString deviceId;
+  // These match RequestDeviceOptions.
+  sequence<BluetoothLEScanFilterInit> filters;
+  sequence<BluetoothServiceUUID> optionalServices = [];
+  sequence<unsigned short> optionalManufacturerData = [];
+  boolean acceptAllDevices = false;
+};
+
+dictionary AllowedBluetoothDevice {
+  required DOMString deviceId;
+  required boolean mayUseGATT;
+  // An allowedServices of "all" means all services are allowed.
+  required (DOMString or sequence<UUID>) allowedServices;
+  required sequence<unsigned short> allowedManufacturerData;
+};
+dictionary BluetoothPermissionStorage {
+  required sequence<AllowedBluetoothDevice> allowedDevices;
+};
+
+[Exposed=Window]
+interface BluetoothPermissionResult : PermissionStatus {
+  attribute FrozenArray<BluetoothDevice> devices;
+};
+
+[
+  Exposed=Window,
+  SecureContext
+]
+interface ValueEvent : Event {
+  constructor(DOMString type, optional ValueEventInit initDict = {});
+  readonly attribute any value;
+};
+
+dictionary ValueEventInit : EventInit {
+  any value = null;
+};
+
+[Exposed=Window, SecureContext]
+interface BluetoothDevice : EventTarget {
+  readonly attribute DOMString id;
+  readonly attribute DOMString? name;
+  readonly attribute BluetoothRemoteGATTServer? gatt;
+
+  Promise<undefined> forget();
+  Promise<undefined> watchAdvertisements(
+      optional WatchAdvertisementsOptions options = {});
+  readonly attribute boolean watchingAdvertisements;
+};
+BluetoothDevice includes BluetoothDeviceEventHandlers;
+BluetoothDevice includes CharacteristicEventHandlers;
+BluetoothDevice includes ServiceEventHandlers;
+
+dictionary WatchAdvertisementsOptions {
+  AbortSignal signal;
+};
+
+[Exposed=Window, SecureContext]
+interface BluetoothManufacturerDataMap {
+  readonly maplike<unsigned short, DataView>;
+};
+[Exposed=Window, SecureContext]
+interface BluetoothServiceDataMap {
+  readonly maplike<UUID, DataView>;
+};
+[
+  Exposed=Window,
+  SecureContext
+]
+interface BluetoothAdvertisingEvent : Event {
+  constructor(DOMString type, BluetoothAdvertisingEventInit init);
+  [SameObject]
+  readonly attribute BluetoothDevice device;
+  readonly attribute FrozenArray<UUID> uuids;
+  readonly attribute DOMString? name;
+  readonly attribute unsigned short? appearance;
+  readonly attribute byte? txPower;
+  readonly attribute byte? rssi;
+  [SameObject]
+  readonly attribute BluetoothManufacturerDataMap manufacturerData;
+  [SameObject]
+  readonly attribute BluetoothServiceDataMap serviceData;
+};
+dictionary BluetoothAdvertisingEventInit : EventInit {
+  required BluetoothDevice device;
+  sequence<(DOMString or unsigned long)> uuids;
+  DOMString name;
+  unsigned short appearance;
+  byte txPower;
+  byte rssi;
+  BluetoothManufacturerDataMap manufacturerData;
+  BluetoothServiceDataMap serviceData;
+};
+
+[Exposed=Window, SecureContext]
+interface BluetoothRemoteGATTServer {
+  [SameObject]
+  readonly attribute BluetoothDevice device;
+  readonly attribute boolean connected;
+  Promise<BluetoothRemoteGATTServer> connect();
+  undefined disconnect();
+  Promise<BluetoothRemoteGATTService> getPrimaryService(BluetoothServiceUUID service);
+  Promise<sequence<BluetoothRemoteGATTService>>
+    getPrimaryServices(optional BluetoothServiceUUID service);
+};
+
+[Exposed=Window, SecureContext]
+interface BluetoothRemoteGATTService : EventTarget {
+  [SameObject]
+  readonly attribute BluetoothDevice device;
+  readonly attribute UUID uuid;
+  readonly attribute boolean isPrimary;
+  Promise<BluetoothRemoteGATTCharacteristic>
+    getCharacteristic(BluetoothCharacteristicUUID characteristic);
+  Promise<sequence<BluetoothRemoteGATTCharacteristic>>
+    getCharacteristics(optional BluetoothCharacteristicUUID characteristic);
+  Promise<BluetoothRemoteGATTService>
+    getIncludedService(BluetoothServiceUUID service);
+  Promise<sequence<BluetoothRemoteGATTService>>
+    getIncludedServices(optional BluetoothServiceUUID service);
+};
+BluetoothRemoteGATTService includes CharacteristicEventHandlers;
+BluetoothRemoteGATTService includes ServiceEventHandlers;
+
+[Exposed=Window, SecureContext]
+interface BluetoothRemoteGATTCharacteristic : EventTarget {
+  [SameObject]
+  readonly attribute BluetoothRemoteGATTService service;
+  readonly attribute UUID uuid;
+  readonly attribute BluetoothCharacteristicProperties properties;
+  readonly attribute DataView? value;
+  Promise<BluetoothRemoteGATTDescriptor> getDescriptor(BluetoothDescriptorUUID descriptor);
+  Promise<sequence<BluetoothRemoteGATTDescriptor>>
+    getDescriptors(optional BluetoothDescriptorUUID descriptor);
+  Promise<DataView> readValue();
+  Promise<undefined> writeValue(BufferSource value);
+  Promise<undefined> writeValueWithResponse(BufferSource value);
+  Promise<undefined> writeValueWithoutResponse(BufferSource value);
+  Promise<BluetoothRemoteGATTCharacteristic> startNotifications();
+  Promise<BluetoothRemoteGATTCharacteristic> stopNotifications();
+};
+BluetoothRemoteGATTCharacteristic includes CharacteristicEventHandlers;
+
+[Exposed=Window, SecureContext]
+interface BluetoothCharacteristicProperties {
+  readonly attribute boolean broadcast;
+  readonly attribute boolean read;
+  readonly attribute boolean writeWithoutResponse;
+  readonly attribute boolean write;
+  readonly attribute boolean notify;
+  readonly attribute boolean indicate;
+  readonly attribute boolean authenticatedSignedWrites;
+  readonly attribute boolean reliableWrite;
+  readonly attribute boolean writableAuxiliaries;
+};
+
+[Exposed=Window, SecureContext]
+interface BluetoothRemoteGATTDescriptor {
+  [SameObject]
+  readonly attribute BluetoothRemoteGATTCharacteristic characteristic;
+  readonly attribute UUID uuid;
+  readonly attribute DataView? value;
+  Promise<DataView> readValue();
+  Promise<undefined> writeValue(BufferSource value);
+};
+
+[SecureContext]
+interface mixin CharacteristicEventHandlers {
+  attribute EventHandler oncharacteristicvaluechanged;
+};
+
+[SecureContext]
+interface mixin BluetoothDeviceEventHandlers {
+  attribute EventHandler onadvertisementreceived;
+  attribute EventHandler ongattserverdisconnected;
+};
+
+[SecureContext]
+interface mixin ServiceEventHandlers {
+  attribute EventHandler onserviceadded;
+  attribute EventHandler onservicechanged;
+  attribute EventHandler onserviceremoved;
+};
+
+typedef DOMString UUID;
+
+[Exposed=Window]
+interface BluetoothUUID {
+  static UUID getService((DOMString or unsigned long) name);
+  static UUID getCharacteristic((DOMString or unsigned long) name);
+  static UUID getDescriptor((DOMString or unsigned long) name);
+
+  static UUID canonicalUUID([EnforceRange] unsigned long alias);
+};
+
+typedef (DOMString or unsigned long) BluetoothServiceUUID;
+typedef (DOMString or unsigned long) BluetoothCharacteristicUUID;
+typedef (DOMString or unsigned long) BluetoothDescriptorUUID;
+
+[SecureContext]
+partial interface Navigator {
+  [SameObject]
+  readonly attribute Bluetooth bluetooth;
+};
diff --git a/test/wpt/tests/interfaces/web-locks.idl b/test/wpt/tests/interfaces/web-locks.idl
new file mode 100644
index 00000000000..d79e404b983
--- /dev/null
+++ b/test/wpt/tests/interfaces/web-locks.idl
@@ -0,0 +1,50 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Web Locks API (https://w3c.github.io/web-locks/)
+
+[SecureContext]
+interface mixin NavigatorLocks {
+  readonly attribute LockManager locks;
+};
+Navigator includes NavigatorLocks;
+WorkerNavigator includes NavigatorLocks;
+
+[SecureContext, Exposed=(Window,Worker)]
+interface LockManager {
+  Promise<any> request(DOMString name,
+                       LockGrantedCallback callback);
+  Promise<any> request(DOMString name,
+                       LockOptions options,
+                       LockGrantedCallback callback);
+
+  Promise<LockManagerSnapshot> query();
+};
+
+callback LockGrantedCallback = Promise<any> (Lock? lock);
+
+enum LockMode { "shared", "exclusive" };
+
+dictionary LockOptions {
+  LockMode mode = "exclusive";
+  boolean ifAvailable = false;
+  boolean steal = false;
+  AbortSignal signal;
+};
+
+dictionary LockManagerSnapshot {
+  sequence<LockInfo> held;
+  sequence<LockInfo> pending;
+};
+
+dictionary LockInfo {
+  DOMString name;
+  LockMode mode;
+  DOMString clientId;
+};
+
+[SecureContext, Exposed=(Window,Worker)]
+interface Lock {
+  readonly attribute DOMString name;
+  readonly attribute LockMode mode;
+};
diff --git a/test/wpt/tests/interfaces/web-nfc.idl b/test/wpt/tests/interfaces/web-nfc.idl
new file mode 100644
index 00000000000..ff042b044e1
--- /dev/null
+++ b/test/wpt/tests/interfaces/web-nfc.idl
@@ -0,0 +1,81 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Web NFC (https://w3c.github.io/web-nfc/)
+
+[SecureContext, Exposed=Window]
+interface NDEFMessage {
+  constructor(NDEFMessageInit messageInit);
+  readonly attribute FrozenArray<NDEFRecord> records;
+};
+
+dictionary NDEFMessageInit {
+  required sequence<NDEFRecordInit> records;
+};
+
+[SecureContext, Exposed=Window]
+interface NDEFRecord {
+  constructor(NDEFRecordInit recordInit);
+
+  readonly attribute USVString recordType;
+  readonly attribute USVString? mediaType;
+  readonly attribute USVString? id;
+  readonly attribute DataView? data;
+
+  readonly attribute USVString? encoding;
+  readonly attribute USVString? lang;
+
+  sequence<NDEFRecord>? toRecords();
+};
+
+dictionary NDEFRecordInit {
+  required USVString recordType;
+  USVString mediaType;
+  USVString id;
+
+  USVString encoding;
+  USVString lang;
+
+  any data; // DOMString or BufferSource or NDEFMessageInit
+};
+
+typedef (DOMString or BufferSource or NDEFMessageInit) NDEFMessageSource;
+
+[SecureContext, Exposed=Window]
+interface NDEFReader : EventTarget {
+  constructor();
+
+  attribute EventHandler onreading;
+  attribute EventHandler onreadingerror;
+
+  Promise<undefined> scan(optional NDEFScanOptions options={});
+  Promise<undefined> write(NDEFMessageSource message,
+                                 optional NDEFWriteOptions options={});
+  Promise<undefined> makeReadOnly(optional NDEFMakeReadOnlyOptions options={});
+};
+
+[SecureContext, Exposed=Window]
+interface NDEFReadingEvent : Event {
+  constructor(DOMString type, NDEFReadingEventInit readingEventInitDict);
+
+  readonly attribute DOMString serialNumber;
+  [SameObject] readonly attribute NDEFMessage message;
+};
+
+dictionary NDEFReadingEventInit : EventInit {
+  DOMString? serialNumber = "";
+  required NDEFMessageInit message;
+};
+
+dictionary NDEFWriteOptions {
+  boolean overwrite = true;
+  AbortSignal? signal;
+};
+
+dictionary NDEFMakeReadOnlyOptions {
+  AbortSignal? signal;
+};
+
+dictionary NDEFScanOptions {
+  AbortSignal signal;
+};
diff --git a/test/wpt/tests/interfaces/web-otp.idl b/test/wpt/tests/interfaces/web-otp.idl
new file mode 100644
index 00000000000..591979e8beb
--- /dev/null
+++ b/test/wpt/tests/interfaces/web-otp.idl
@@ -0,0 +1,21 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: WebOTP API (https://wicg.github.io/web-otp/)
+
+[Exposed=Window, SecureContext]
+interface OTPCredential : Credential {
+    readonly attribute DOMString code;
+};
+
+partial dictionary CredentialRequestOptions {
+    OTPCredentialRequestOptions otp;
+};
+
+dictionary OTPCredentialRequestOptions {
+  sequence<OTPCredentialTransportType> transport = [];
+};
+
+enum OTPCredentialTransportType {
+    "sms",
+};
diff --git a/test/wpt/tests/interfaces/web-share.idl b/test/wpt/tests/interfaces/web-share.idl
new file mode 100644
index 00000000000..12a2dbb8aca
--- /dev/null
+++ b/test/wpt/tests/interfaces/web-share.idl
@@ -0,0 +1,16 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Web Share API (https://w3c.github.io/web-share/)
+
+partial interface Navigator {
+  [SecureContext] Promise<undefined> share(optional ShareData data = {});
+  [SecureContext] boolean canShare(optional ShareData data = {});
+};
+
+dictionary ShareData {
+  sequence<File> files;
+  USVString title;
+  USVString text;
+  USVString url;
+};
diff --git a/test/wpt/tests/interfaces/webaudio.idl b/test/wpt/tests/interfaces/webaudio.idl
new file mode 100644
index 00000000000..1569de204bd
--- /dev/null
+++ b/test/wpt/tests/interfaces/webaudio.idl
@@ -0,0 +1,674 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Web Audio API (https://webaudio.github.io/web-audio-api/)
+
+enum AudioContextState {
+    "suspended",
+    "running",
+    "closed"
+};
+
+callback DecodeErrorCallback = undefined (DOMException error);
+
+callback DecodeSuccessCallback = undefined (AudioBuffer decodedData);
+
+[Exposed=Window]
+interface BaseAudioContext : EventTarget {
+    readonly attribute AudioDestinationNode destination;
+    readonly attribute float sampleRate;
+    readonly attribute double currentTime;
+    readonly attribute AudioListener listener;
+    readonly attribute AudioContextState state;
+    [SameObject, SecureContext]
+    readonly attribute AudioWorklet audioWorklet;
+    attribute EventHandler onstatechange;
+
+    AnalyserNode createAnalyser ();
+    BiquadFilterNode createBiquadFilter ();
+    AudioBuffer createBuffer (unsigned long numberOfChannels,
+                              unsigned long length,
+                              float sampleRate);
+    AudioBufferSourceNode createBufferSource ();
+    ChannelMergerNode createChannelMerger (optional unsigned long numberOfInputs = 6);
+    ChannelSplitterNode createChannelSplitter (
+        optional unsigned long numberOfOutputs = 6);
+    ConstantSourceNode createConstantSource ();
+    ConvolverNode createConvolver ();
+    DelayNode createDelay (optional double maxDelayTime = 1.0);
+    DynamicsCompressorNode createDynamicsCompressor ();
+    GainNode createGain ();
+    IIRFilterNode createIIRFilter (sequence<double> feedforward,
+                                   sequence<double> feedback);
+    OscillatorNode createOscillator ();
+    PannerNode createPanner ();
+    PeriodicWave createPeriodicWave (sequence<float> real,
+                                     sequence<float> imag,
+                                     optional PeriodicWaveConstraints constraints = {});
+    ScriptProcessorNode createScriptProcessor(
+        optional unsigned long bufferSize = 0,
+        optional unsigned long numberOfInputChannels = 2,
+        optional unsigned long numberOfOutputChannels = 2);
+    StereoPannerNode createStereoPanner ();
+    WaveShaperNode createWaveShaper ();
+
+    Promise<AudioBuffer> decodeAudioData (
+        ArrayBuffer audioData,
+        optional DecodeSuccessCallback? successCallback,
+        optional DecodeErrorCallback? errorCallback);
+};
+
+enum AudioContextLatencyCategory {
+        "balanced",
+        "interactive",
+        "playback"
+};
+
+enum AudioSinkType {
+    "none"
+};
+
+[Exposed=Window]
+interface AudioContext : BaseAudioContext {
+    constructor (optional AudioContextOptions contextOptions = {});
+    readonly attribute double baseLatency;
+    readonly attribute double outputLatency;
+    [SecureContext] readonly attribute (DOMString or AudioSinkInfo) sinkId;
+    [SecureContext] readonly attribute AudioRenderCapacity renderCapacity;
+    attribute EventHandler onsinkchange;
+    AudioTimestamp getOutputTimestamp ();
+    Promise<undefined> resume ();
+    Promise<undefined> suspend ();
+    Promise<undefined> close ();
+    [SecureContext] Promise<undefined> setSinkId ((DOMString or AudioSinkOptions) sinkId);
+    MediaElementAudioSourceNode createMediaElementSource (HTMLMediaElement mediaElement);
+    MediaStreamAudioSourceNode createMediaStreamSource (MediaStream mediaStream);
+    MediaStreamTrackAudioSourceNode createMediaStreamTrackSource (
+        MediaStreamTrack mediaStreamTrack);
+    MediaStreamAudioDestinationNode createMediaStreamDestination ();
+};
+
+dictionary AudioContextOptions {
+    (AudioContextLatencyCategory or double) latencyHint = "interactive";
+    float sampleRate;
+    (DOMString or AudioSinkOptions) sinkId;
+};
+
+dictionary AudioSinkOptions {
+    required AudioSinkType type;
+};
+
+[Exposed=Window]
+interface AudioSinkInfo {
+    readonly attribute AudioSinkType type;
+};
+
+dictionary AudioTimestamp {
+    double contextTime;
+    DOMHighResTimeStamp performanceTime;
+};
+
+[Exposed=Window]
+interface AudioRenderCapacity : EventTarget {
+    undefined start(optional AudioRenderCapacityOptions options = {});
+        undefined stop();
+        attribute EventHandler onupdate;
+};
+
+dictionary AudioRenderCapacityOptions {
+        double updateInterval = 1;
+};
+
+[Exposed=Window]
+interface AudioRenderCapacityEvent : Event {
+    constructor (DOMString type, optional AudioRenderCapacityEventInit eventInitDict = {});
+        readonly attribute double timestamp;
+        readonly attribute double averageLoad;
+        readonly attribute double peakLoad;
+        readonly attribute double underrunRatio;
+};
+
+dictionary AudioRenderCapacityEventInit : EventInit {
+    double timestamp = 0;
+    double averageLoad = 0;
+    double peakLoad = 0;
+    double underrunRatio = 0;
+};
+
+[Exposed=Window]
+interface OfflineAudioContext : BaseAudioContext {
+    constructor(OfflineAudioContextOptions contextOptions);
+    constructor(unsigned long numberOfChannels, unsigned long length, float sampleRate);
+    Promise<AudioBuffer> startRendering();
+    Promise<undefined> resume();
+    Promise<undefined> suspend(double suspendTime);
+    readonly attribute unsigned long length;
+    attribute EventHandler oncomplete;
+};
+
+dictionary OfflineAudioContextOptions {
+    unsigned long numberOfChannels = 1;
+    required unsigned long length;
+    required float sampleRate;
+};
+
+[Exposed=Window]
+interface OfflineAudioCompletionEvent : Event {
+    constructor (DOMString type, OfflineAudioCompletionEventInit eventInitDict);
+    readonly attribute AudioBuffer renderedBuffer;
+};
+
+dictionary OfflineAudioCompletionEventInit : EventInit {
+    required AudioBuffer renderedBuffer;
+};
+
+[Exposed=Window]
+interface AudioBuffer {
+    constructor (AudioBufferOptions options);
+    readonly attribute float sampleRate;
+    readonly attribute unsigned long length;
+    readonly attribute double duration;
+    readonly attribute unsigned long numberOfChannels;
+    Float32Array getChannelData (unsigned long channel);
+    undefined copyFromChannel (Float32Array destination,
+                               unsigned long channelNumber,
+                               optional unsigned long bufferOffset = 0);
+    undefined copyToChannel (Float32Array source,
+                             unsigned long channelNumber,
+                             optional unsigned long bufferOffset = 0);
+};
+
+dictionary AudioBufferOptions {
+    unsigned long numberOfChannels = 1;
+    required unsigned long length;
+    required float sampleRate;
+};
+
+[Exposed=Window]
+interface AudioNode : EventTarget {
+    AudioNode connect (AudioNode destinationNode,
+                       optional unsigned long output = 0,
+                       optional unsigned long input = 0);
+    undefined connect (AudioParam destinationParam, optional unsigned long output = 0);
+    undefined disconnect ();
+    undefined disconnect (unsigned long output);
+    undefined disconnect (AudioNode destinationNode);
+    undefined disconnect (AudioNode destinationNode, unsigned long output);
+    undefined disconnect (AudioNode destinationNode,
+                          unsigned long output,
+                          unsigned long input);
+    undefined disconnect (AudioParam destinationParam);
+    undefined disconnect (AudioParam destinationParam, unsigned long output);
+    readonly attribute BaseAudioContext context;
+    readonly attribute unsigned long numberOfInputs;
+    readonly attribute unsigned long numberOfOutputs;
+    attribute unsigned long channelCount;
+    attribute ChannelCountMode channelCountMode;
+    attribute ChannelInterpretation channelInterpretation;
+};
+
+enum ChannelCountMode {
+    "max",
+    "clamped-max",
+    "explicit"
+};
+
+enum ChannelInterpretation {
+    "speakers",
+    "discrete"
+};
+
+dictionary AudioNodeOptions {
+    unsigned long channelCount;
+    ChannelCountMode channelCountMode;
+    ChannelInterpretation channelInterpretation;
+};
+
+enum AutomationRate {
+    "a-rate",
+    "k-rate"
+};
+
+[Exposed=Window]
+interface AudioParam {
+    attribute float value;
+    attribute AutomationRate automationRate;
+    readonly attribute float defaultValue;
+    readonly attribute float minValue;
+    readonly attribute float maxValue;
+    AudioParam setValueAtTime (float value, double startTime);
+    AudioParam linearRampToValueAtTime (float value, double endTime);
+    AudioParam exponentialRampToValueAtTime (float value, double endTime);
+    AudioParam setTargetAtTime (float target, double startTime, float timeConstant);
+    AudioParam setValueCurveAtTime (sequence<float> values,
+                                    double startTime,
+                                    double duration);
+    AudioParam cancelScheduledValues (double cancelTime);
+    AudioParam cancelAndHoldAtTime (double cancelTime);
+};
+
+[Exposed=Window]
+interface AudioScheduledSourceNode : AudioNode {
+    attribute EventHandler onended;
+    undefined start(optional double when = 0);
+    undefined stop(optional double when = 0);
+};
+
+[Exposed=Window]
+interface AnalyserNode : AudioNode {
+    constructor (BaseAudioContext context, optional AnalyserOptions options = {});
+    undefined getFloatFrequencyData (Float32Array array);
+    undefined getByteFrequencyData (Uint8Array array);
+    undefined getFloatTimeDomainData (Float32Array array);
+    undefined getByteTimeDomainData (Uint8Array array);
+    attribute unsigned long fftSize;
+    readonly attribute unsigned long frequencyBinCount;
+    attribute double minDecibels;
+    attribute double maxDecibels;
+    attribute double smoothingTimeConstant;
+};
+
+dictionary AnalyserOptions : AudioNodeOptions {
+    unsigned long fftSize = 2048;
+    double maxDecibels = -30;
+    double minDecibels = -100;
+    double smoothingTimeConstant = 0.8;
+};
+
+[Exposed=Window]
+interface AudioBufferSourceNode : AudioScheduledSourceNode {
+    constructor (BaseAudioContext context,
+                 optional AudioBufferSourceOptions options = {});
+    attribute AudioBuffer? buffer;
+    readonly attribute AudioParam playbackRate;
+    readonly attribute AudioParam detune;
+    attribute boolean loop;
+    attribute double loopStart;
+    attribute double loopEnd;
+    undefined start (optional double when = 0,
+                     optional double offset,
+                     optional double duration);
+};
+
+dictionary AudioBufferSourceOptions {
+    AudioBuffer? buffer;
+    float detune = 0;
+    boolean loop = false;
+    double loopEnd = 0;
+    double loopStart = 0;
+    float playbackRate = 1;
+};
+
+[Exposed=Window]
+interface AudioDestinationNode : AudioNode {
+    readonly attribute unsigned long maxChannelCount;
+};
+
+[Exposed=Window]
+interface AudioListener {
+    readonly attribute AudioParam positionX;
+    readonly attribute AudioParam positionY;
+    readonly attribute AudioParam positionZ;
+    readonly attribute AudioParam forwardX;
+    readonly attribute AudioParam forwardY;
+    readonly attribute AudioParam forwardZ;
+    readonly attribute AudioParam upX;
+    readonly attribute AudioParam upY;
+    readonly attribute AudioParam upZ;
+    undefined setPosition (float x, float y, float z);
+    undefined setOrientation (float x, float y, float z, float xUp, float yUp, float zUp);
+};
+
+[Exposed=Window]
+interface AudioProcessingEvent : Event {
+    constructor (DOMString type, AudioProcessingEventInit eventInitDict);
+    readonly attribute double playbackTime;
+    readonly attribute AudioBuffer inputBuffer;
+    readonly attribute AudioBuffer outputBuffer;
+};
+
+dictionary AudioProcessingEventInit : EventInit {
+    required double playbackTime;
+    required AudioBuffer inputBuffer;
+    required AudioBuffer outputBuffer;
+};
+
+enum BiquadFilterType {
+    "lowpass",
+    "highpass",
+    "bandpass",
+    "lowshelf",
+    "highshelf",
+    "peaking",
+    "notch",
+    "allpass"
+};
+
+[Exposed=Window]
+interface BiquadFilterNode : AudioNode {
+    constructor (BaseAudioContext context, optional BiquadFilterOptions options = {});
+    attribute BiquadFilterType type;
+    readonly attribute AudioParam frequency;
+    readonly attribute AudioParam detune;
+    readonly attribute AudioParam Q;
+    readonly attribute AudioParam gain;
+    undefined getFrequencyResponse (Float32Array frequencyHz,
+                                    Float32Array magResponse,
+                                    Float32Array phaseResponse);
+};
+
+dictionary BiquadFilterOptions : AudioNodeOptions {
+    BiquadFilterType type = "lowpass";
+    float Q = 1;
+    float detune = 0;
+    float frequency = 350;
+    float gain = 0;
+};
+
+[Exposed=Window]
+interface ChannelMergerNode : AudioNode {
+    constructor (BaseAudioContext context, optional ChannelMergerOptions options = {});
+};
+
+dictionary ChannelMergerOptions : AudioNodeOptions {
+    unsigned long numberOfInputs = 6;
+};
+
+[Exposed=Window]
+interface ChannelSplitterNode : AudioNode {
+    constructor (BaseAudioContext context, optional ChannelSplitterOptions options = {});
+};
+
+dictionary ChannelSplitterOptions : AudioNodeOptions {
+    unsigned long numberOfOutputs = 6;
+};
+
+[Exposed=Window]
+interface ConstantSourceNode : AudioScheduledSourceNode {
+    constructor (BaseAudioContext context, optional ConstantSourceOptions options = {});
+    readonly attribute AudioParam offset;
+};
+
+dictionary ConstantSourceOptions {
+    float offset = 1;
+};
+
+[Exposed=Window]
+interface ConvolverNode : AudioNode {
+    constructor (BaseAudioContext context, optional ConvolverOptions options = {});
+    attribute AudioBuffer? buffer;
+    attribute boolean normalize;
+};
+
+dictionary ConvolverOptions : AudioNodeOptions {
+    AudioBuffer? buffer;
+    boolean disableNormalization = false;
+};
+
+[Exposed=Window]
+interface DelayNode : AudioNode {
+    constructor (BaseAudioContext context, optional DelayOptions options = {});
+    readonly attribute AudioParam delayTime;
+};
+
+dictionary DelayOptions : AudioNodeOptions {
+    double maxDelayTime = 1;
+    double delayTime = 0;
+};
+
+[Exposed=Window]
+interface DynamicsCompressorNode : AudioNode {
+    constructor (BaseAudioContext context,
+                 optional DynamicsCompressorOptions options = {});
+    readonly attribute AudioParam threshold;
+    readonly attribute AudioParam knee;
+    readonly attribute AudioParam ratio;
+    readonly attribute float reduction;
+    readonly attribute AudioParam attack;
+    readonly attribute AudioParam release;
+};
+
+dictionary DynamicsCompressorOptions : AudioNodeOptions {
+    float attack = 0.003;
+    float knee = 30;
+    float ratio = 12;
+    float release = 0.25;
+    float threshold = -24;
+};
+
+[Exposed=Window]
+interface GainNode : AudioNode {
+    constructor (BaseAudioContext context, optional GainOptions options = {});
+    readonly attribute AudioParam gain;
+};
+
+dictionary GainOptions : AudioNodeOptions {
+    float gain = 1.0;
+};
+
+[Exposed=Window]
+interface IIRFilterNode : AudioNode {
+    constructor (BaseAudioContext context, IIRFilterOptions options);
+    undefined getFrequencyResponse (Float32Array frequencyHz,
+                                    Float32Array magResponse,
+                                    Float32Array phaseResponse);
+};
+
+dictionary IIRFilterOptions : AudioNodeOptions {
+    required sequence<double> feedforward;
+    required sequence<double> feedback;
+};
+
+[Exposed=Window]
+interface MediaElementAudioSourceNode : AudioNode {
+    constructor (AudioContext context, MediaElementAudioSourceOptions options);
+    [SameObject] readonly attribute HTMLMediaElement mediaElement;
+};
+
+dictionary MediaElementAudioSourceOptions {
+    required HTMLMediaElement mediaElement;
+};
+
+[Exposed=Window]
+interface MediaStreamAudioDestinationNode : AudioNode {
+    constructor (AudioContext context, optional AudioNodeOptions options = {});
+    readonly attribute MediaStream stream;
+};
+
+[Exposed=Window]
+interface MediaStreamAudioSourceNode : AudioNode {
+    constructor (AudioContext context, MediaStreamAudioSourceOptions options);
+    [SameObject] readonly attribute MediaStream mediaStream;
+};
+
+dictionary MediaStreamAudioSourceOptions {
+    required MediaStream mediaStream;
+};
+
+[Exposed=Window]
+interface MediaStreamTrackAudioSourceNode : AudioNode {
+    constructor (AudioContext context, MediaStreamTrackAudioSourceOptions options);
+};
+
+dictionary MediaStreamTrackAudioSourceOptions {
+    required MediaStreamTrack mediaStreamTrack;
+};
+
+enum OscillatorType {
+    "sine",
+    "square",
+    "sawtooth",
+    "triangle",
+    "custom"
+};
+
+[Exposed=Window]
+interface OscillatorNode : AudioScheduledSourceNode {
+    constructor (BaseAudioContext context, optional OscillatorOptions options = {});
+    attribute OscillatorType type;
+    readonly attribute AudioParam frequency;
+    readonly attribute AudioParam detune;
+    undefined setPeriodicWave (PeriodicWave periodicWave);
+};
+
+dictionary OscillatorOptions : AudioNodeOptions {
+    OscillatorType type = "sine";
+    float frequency = 440;
+    float detune = 0;
+    PeriodicWave periodicWave;
+};
+
+enum PanningModelType {
+        "equalpower",
+        "HRTF"
+};
+
+enum DistanceModelType {
+    "linear",
+    "inverse",
+    "exponential"
+};
+
+[Exposed=Window]
+interface PannerNode : AudioNode {
+    constructor (BaseAudioContext context, optional PannerOptions options = {});
+    attribute PanningModelType panningModel;
+    readonly attribute AudioParam positionX;
+    readonly attribute AudioParam positionY;
+    readonly attribute AudioParam positionZ;
+    readonly attribute AudioParam orientationX;
+    readonly attribute AudioParam orientationY;
+    readonly attribute AudioParam orientationZ;
+    attribute DistanceModelType distanceModel;
+    attribute double refDistance;
+    attribute double maxDistance;
+    attribute double rolloffFactor;
+    attribute double coneInnerAngle;
+    attribute double coneOuterAngle;
+    attribute double coneOuterGain;
+    undefined setPosition (float x, float y, float z);
+    undefined setOrientation (float x, float y, float z);
+};
+
+dictionary PannerOptions : AudioNodeOptions {
+    PanningModelType panningModel = "equalpower";
+    DistanceModelType distanceModel = "inverse";
+    float positionX = 0;
+    float positionY = 0;
+    float positionZ = 0;
+    float orientationX = 1;
+    float orientationY = 0;
+    float orientationZ = 0;
+    double refDistance = 1;
+    double maxDistance = 10000;
+    double rolloffFactor = 1;
+    double coneInnerAngle = 360;
+    double coneOuterAngle = 360;
+    double coneOuterGain = 0;
+};
+
+[Exposed=Window]
+interface PeriodicWave {
+    constructor (BaseAudioContext context, optional PeriodicWaveOptions options = {});
+};
+
+dictionary PeriodicWaveConstraints {
+    boolean disableNormalization = false;
+};
+
+dictionary PeriodicWaveOptions : PeriodicWaveConstraints {
+    sequence<float> real;
+    sequence<float> imag;
+};
+
+[Exposed=Window]
+interface ScriptProcessorNode : AudioNode {
+    attribute EventHandler onaudioprocess;
+    readonly attribute long bufferSize;
+};
+
+[Exposed=Window]
+interface StereoPannerNode : AudioNode {
+    constructor (BaseAudioContext context, optional StereoPannerOptions options = {});
+    readonly attribute AudioParam pan;
+};
+
+dictionary StereoPannerOptions : AudioNodeOptions {
+    float pan = 0;
+};
+
+enum OverSampleType {
+    "none",
+    "2x",
+    "4x"
+};
+
+[Exposed=Window]
+interface WaveShaperNode : AudioNode {
+    constructor (BaseAudioContext context, optional WaveShaperOptions options = {});
+    attribute Float32Array? curve;
+    attribute OverSampleType oversample;
+};
+
+dictionary WaveShaperOptions : AudioNodeOptions {
+    sequence<float> curve;
+    OverSampleType oversample = "none";
+};
+
+[Exposed=Window, SecureContext]
+interface AudioWorklet : Worklet {
+  readonly attribute MessagePort port;
+};
+
+callback AudioWorkletProcessorConstructor = AudioWorkletProcessor (object options);
+
+[Global=(Worklet, AudioWorklet), Exposed=AudioWorklet]
+interface AudioWorkletGlobalScope : WorkletGlobalScope {
+    undefined registerProcessor (DOMString name,
+                                               AudioWorkletProcessorConstructor processorCtor);
+    readonly attribute unsigned long long currentFrame;
+    readonly attribute double currentTime;
+    readonly attribute float sampleRate;
+    readonly attribute MessagePort port;
+};
+
+[Exposed=Window]
+interface AudioParamMap {
+    readonly maplike<DOMString, AudioParam>;
+};
+
+[Exposed=Window, SecureContext]
+interface AudioWorkletNode : AudioNode {
+    constructor (BaseAudioContext context, DOMString name,
+               optional AudioWorkletNodeOptions options = {});
+    readonly attribute AudioParamMap parameters;
+    readonly attribute MessagePort port;
+    attribute EventHandler onprocessorerror;
+};
+
+dictionary AudioWorkletNodeOptions : AudioNodeOptions {
+    unsigned long numberOfInputs = 1;
+    unsigned long numberOfOutputs = 1;
+    sequence<unsigned long> outputChannelCount;
+    record<DOMString, double> parameterData;
+    object processorOptions;
+};
+
+[Exposed=AudioWorklet]
+interface AudioWorkletProcessor {
+    constructor ();
+    readonly attribute MessagePort port;
+};
+
+callback AudioWorkletProcessCallback =
+  boolean (FrozenArray<FrozenArray<Float32Array>> inputs,
+           FrozenArray<FrozenArray<Float32Array>> outputs,
+           object parameters);
+
+dictionary AudioParamDescriptor {
+    required DOMString name;
+    float defaultValue = 0;
+    float minValue = -3.4028235e38;
+    float maxValue = 3.4028235e38;
+    AutomationRate automationRate = "a-rate";
+};
diff --git a/test/wpt/tests/interfaces/webauthn.idl b/test/wpt/tests/interfaces/webauthn.idl
new file mode 100644
index 00000000000..ef27322312f
--- /dev/null
+++ b/test/wpt/tests/interfaces/webauthn.idl
@@ -0,0 +1,349 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Web Authentication: An API for accessing Public Key Credentials - Level (https://w3c.github.io/webauthn/)
+
+[SecureContext, Exposed=Window]
+interface PublicKeyCredential : Credential {
+    [SameObject] readonly attribute ArrayBuffer              rawId;
+    [SameObject] readonly attribute AuthenticatorResponse    response;
+    [SameObject] readonly attribute DOMString?               authenticatorAttachment;
+    AuthenticationExtensionsClientOutputs getClientExtensionResults();
+    static Promise<boolean> isConditionalMediationAvailable();
+    PublicKeyCredentialJSON toJSON();
+};
+
+typedef DOMString Base64URLString;
+typedef (RegistrationResponseJSON or AuthenticationResponseJSON) PublicKeyCredentialJSON;
+
+dictionary RegistrationResponseJSON {
+    Base64URLString id;
+    Base64URLString rawId;
+    AuthenticatorAttestationResponseJSON response;
+    DOMString? authenticatorAttachment;
+    AuthenticationExtensionsClientOutputsJSON clientExtensionResults;
+    DOMString type;
+};
+
+dictionary AuthenticatorAttestationResponseJSON {
+    Base64URLString clientDataJSON;
+    Base64URLString attestationObject;
+    sequence<DOMString> transports;
+};
+
+dictionary AuthenticationResponseJSON {
+    Base64URLString id;
+    Base64URLString rawId;
+    AuthenticatorAssertionResponseJSON response;
+    DOMString? authenticatorAttachment;
+    AuthenticationExtensionsClientOutputsJSON clientExtensionResults;
+    DOMString type;
+};
+
+dictionary AuthenticatorAssertionResponseJSON {
+    Base64URLString clientDataJSON;
+    Base64URLString authenticatorData;
+    Base64URLString signature;
+    Base64URLString? userHandle;
+};
+
+dictionary AuthenticationExtensionsClientOutputsJSON {
+};
+
+partial dictionary CredentialCreationOptions {
+    PublicKeyCredentialCreationOptions      publicKey;
+};
+
+partial dictionary CredentialRequestOptions {
+    PublicKeyCredentialRequestOptions      publicKey;
+};
+
+partial interface PublicKeyCredential {
+    static Promise<boolean> isUserVerifyingPlatformAuthenticatorAvailable();
+};
+
+partial interface PublicKeyCredential {
+    static PublicKeyCredentialCreationOptions parseCreationOptionsFromJSON(PublicKeyCredentialCreationOptionsJSON options);
+};
+
+dictionary PublicKeyCredentialCreationOptionsJSON {
+    required PublicKeyCredentialRpEntity                    rp;
+    required PublicKeyCredentialUserEntityJSON              user;
+    required Base64URLString                                challenge;
+    required sequence<PublicKeyCredentialParameters>        pubKeyCredParams;
+    unsigned long                                           timeout;
+    sequence<PublicKeyCredentialDescriptorJSON>             excludeCredentials = [];
+    AuthenticatorSelectionCriteria                          authenticatorSelection;
+    DOMString                                               attestation = "none";
+    AuthenticationExtensionsClientInputsJSON                extensions;
+};
+
+dictionary PublicKeyCredentialUserEntityJSON {
+    required Base64URLString        id;
+    required DOMString              name;
+    required DOMString              displayName;
+};
+
+dictionary PublicKeyCredentialDescriptorJSON {
+    required Base64URLString        id;
+    required DOMString              type;
+    sequence<DOMString>             transports;
+};
+
+dictionary AuthenticationExtensionsClientInputsJSON {
+};
+
+partial interface PublicKeyCredential {
+    static PublicKeyCredentialRequestOptions parseRequestOptionsFromJSON(PublicKeyCredentialRequestOptionsJSON options);
+};
+
+dictionary PublicKeyCredentialRequestOptionsJSON {
+    required Base64URLString                                challenge;
+    unsigned long                                           timeout;
+    DOMString                                               rpId;
+    sequence<PublicKeyCredentialDescriptorJSON>             allowCredentials = [];
+    DOMString                                               userVerification = "preferred";
+    AuthenticationExtensionsClientInputsJSON                extensions;
+};
+
+[SecureContext, Exposed=Window]
+interface AuthenticatorResponse {
+    [SameObject] readonly attribute ArrayBuffer      clientDataJSON;
+};
+
+[SecureContext, Exposed=Window]
+interface AuthenticatorAttestationResponse : AuthenticatorResponse {
+    [SameObject] readonly attribute ArrayBuffer      attestationObject;
+    sequence<DOMString>                              getTransports();
+    ArrayBuffer                                      getAuthenticatorData();
+    ArrayBuffer?                                     getPublicKey();
+    COSEAlgorithmIdentifier                          getPublicKeyAlgorithm();
+};
+
+[SecureContext, Exposed=Window]
+interface AuthenticatorAssertionResponse : AuthenticatorResponse {
+    [SameObject] readonly attribute ArrayBuffer      authenticatorData;
+    [SameObject] readonly attribute ArrayBuffer      signature;
+    [SameObject] readonly attribute ArrayBuffer?     userHandle;
+    [SameObject] readonly attribute ArrayBuffer?     attestationObject;
+};
+
+dictionary PublicKeyCredentialParameters {
+    required DOMString                    type;
+    required COSEAlgorithmIdentifier      alg;
+};
+
+dictionary PublicKeyCredentialCreationOptions {
+    required PublicKeyCredentialRpEntity         rp;
+    required PublicKeyCredentialUserEntity       user;
+
+    required BufferSource                             challenge;
+    required sequence<PublicKeyCredentialParameters>  pubKeyCredParams;
+
+    unsigned long                                timeout;
+    sequence<PublicKeyCredentialDescriptor>      excludeCredentials = [];
+    AuthenticatorSelectionCriteria               authenticatorSelection;
+    DOMString                                    attestation = "none";
+    sequence<DOMString>                          attestationFormats = [];
+    AuthenticationExtensionsClientInputs         extensions;
+};
+
+dictionary PublicKeyCredentialEntity {
+    required DOMString    name;
+};
+
+dictionary PublicKeyCredentialRpEntity : PublicKeyCredentialEntity {
+    DOMString      id;
+};
+
+dictionary PublicKeyCredentialUserEntity : PublicKeyCredentialEntity {
+    required BufferSource   id;
+    required DOMString      displayName;
+};
+
+dictionary AuthenticatorSelectionCriteria {
+    DOMString                    authenticatorAttachment;
+    DOMString                    residentKey;
+    boolean                      requireResidentKey = false;
+    DOMString                    userVerification = "preferred";
+};
+
+enum AuthenticatorAttachment {
+    "platform",
+    "cross-platform"
+};
+
+enum ResidentKeyRequirement {
+    "discouraged",
+    "preferred",
+    "required"
+};
+
+enum AttestationConveyancePreference {
+    "none",
+    "indirect",
+    "direct",
+    "enterprise"
+};
+
+dictionary PublicKeyCredentialRequestOptions {
+    required BufferSource                challenge;
+    unsigned long                        timeout;
+    USVString                            rpId;
+    sequence<PublicKeyCredentialDescriptor> allowCredentials = [];
+    DOMString                            userVerification = "preferred";
+    DOMString                            attestation = "none";
+    sequence<DOMString>                  attestationFormats = [];
+    AuthenticationExtensionsClientInputs extensions;
+};
+
+dictionary AuthenticationExtensionsClientInputs {
+};
+
+dictionary AuthenticationExtensionsClientOutputs {
+};
+
+dictionary CollectedClientData {
+    required DOMString           type;
+    required DOMString           challenge;
+    required DOMString           origin;
+    boolean                      crossOrigin;
+};
+
+dictionary TokenBinding {
+    required DOMString status;
+    DOMString id;
+};
+
+enum TokenBindingStatus { "present", "supported" };
+
+enum PublicKeyCredentialType {
+    "public-key"
+};
+
+dictionary PublicKeyCredentialDescriptor {
+    required DOMString                    type;
+    required BufferSource                 id;
+    sequence<DOMString>                   transports;
+};
+
+enum AuthenticatorTransport {
+    "usb",
+    "nfc",
+    "ble",
+    "hybrid",
+    "internal"
+};
+
+typedef long COSEAlgorithmIdentifier;
+
+enum UserVerificationRequirement {
+    "required",
+    "preferred",
+    "discouraged"
+};
+
+partial dictionary AuthenticationExtensionsClientInputs {
+  USVString appid;
+};
+
+partial dictionary AuthenticationExtensionsClientOutputs {
+  boolean appid;
+};
+
+partial dictionary AuthenticationExtensionsClientInputs {
+  USVString appidExclude;
+};
+
+partial dictionary AuthenticationExtensionsClientOutputs {
+  boolean appidExclude;
+};
+
+partial dictionary AuthenticationExtensionsClientInputs {
+    boolean credProps;
+};
+
+dictionary CredentialPropertiesOutput {
+    boolean rk;
+};
+
+partial dictionary AuthenticationExtensionsClientOutputs {
+    CredentialPropertiesOutput credProps;
+};
+
+dictionary AuthenticationExtensionsPRFValues {
+    required ArrayBuffer first;
+    ArrayBuffer second;
+};
+
+dictionary AuthenticationExtensionsPRFInputs {
+    AuthenticationExtensionsPRFValues eval;
+    record<USVString, AuthenticationExtensionsPRFValues> evalByCredential;
+};
+
+partial dictionary AuthenticationExtensionsClientInputs {
+    AuthenticationExtensionsPRFInputs prf;
+};
+
+dictionary AuthenticationExtensionsPRFOutputs {
+    boolean enabled;
+    AuthenticationExtensionsPRFValues results;
+};
+
+partial dictionary AuthenticationExtensionsClientOutputs {
+    AuthenticationExtensionsPRFOutputs prf;
+};
+
+partial dictionary AuthenticationExtensionsClientInputs {
+    AuthenticationExtensionsLargeBlobInputs largeBlob;
+};
+
+enum LargeBlobSupport {
+  "required",
+  "preferred",
+};
+
+dictionary AuthenticationExtensionsLargeBlobInputs {
+    DOMString support;
+    boolean read;
+    BufferSource write;
+};
+
+partial dictionary AuthenticationExtensionsClientOutputs {
+    AuthenticationExtensionsLargeBlobOutputs largeBlob;
+};
+
+dictionary AuthenticationExtensionsLargeBlobOutputs {
+    boolean supported;
+    ArrayBuffer blob;
+    boolean written;
+};
+
+partial dictionary AuthenticationExtensionsClientInputs {
+  boolean uvm;
+};
+
+typedef sequence<unsigned long> UvmEntry;
+typedef sequence<UvmEntry> UvmEntries;
+
+partial dictionary AuthenticationExtensionsClientOutputs {
+  UvmEntries uvm;
+};
+
+dictionary AuthenticationExtensionsDevicePublicKeyInputs {
+    DOMString attestation = "none";
+    sequence<DOMString> attestationFormats = [];
+};
+
+partial dictionary AuthenticationExtensionsClientInputs {
+    AuthenticationExtensionsDevicePublicKeyInputs devicePubKey;
+};
+
+dictionary AuthenticationExtensionsDevicePublicKeyOutputs {
+    ArrayBuffer authenticatorOutput;
+    ArrayBuffer signature;
+};
+
+partial dictionary AuthenticationExtensionsClientOutputs {
+    AuthenticationExtensionsDevicePublicKeyOutputs devicePubKey;
+};
diff --git a/test/wpt/tests/interfaces/webcodecs-aac-codec-registration.idl b/test/wpt/tests/interfaces/webcodecs-aac-codec-registration.idl
new file mode 100644
index 00000000000..124a0b0febd
--- /dev/null
+++ b/test/wpt/tests/interfaces/webcodecs-aac-codec-registration.idl
@@ -0,0 +1,17 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: AAC WebCodecs Registration (https://w3c.github.io/webcodecs/aac_codec_registration.html)
+
+partial dictionary AudioEncoderConfig {
+  AacEncoderConfig aac;
+};
+
+dictionary AacEncoderConfig {
+  AacBitstreamFormat format = "aac";
+};
+
+enum AacBitstreamFormat {
+  "aac",
+  "adts",
+};
diff --git a/test/wpt/tests/interfaces/webcodecs-avc-codec-registration.idl b/test/wpt/tests/interfaces/webcodecs-avc-codec-registration.idl
new file mode 100644
index 00000000000..d4074f647da
--- /dev/null
+++ b/test/wpt/tests/interfaces/webcodecs-avc-codec-registration.idl
@@ -0,0 +1,17 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: AVC (H.264) WebCodecs Registration (https://w3c.github.io/webcodecs/avc_codec_registration.html)
+
+partial dictionary VideoEncoderConfig {
+  AvcEncoderConfig avc;
+};
+
+dictionary AvcEncoderConfig {
+  AvcBitstreamFormat format = "avc";
+};
+
+enum AvcBitstreamFormat {
+  "annexb",
+  "avc",
+};
diff --git a/test/wpt/tests/interfaces/webcodecs-flac-codec-registration.idl b/test/wpt/tests/interfaces/webcodecs-flac-codec-registration.idl
new file mode 100644
index 00000000000..0f7e13a53db
--- /dev/null
+++ b/test/wpt/tests/interfaces/webcodecs-flac-codec-registration.idl
@@ -0,0 +1,13 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: FLAC WebCodecs Registration (https://w3c.github.io/webcodecs/flac_codec_registration.html)
+
+partial dictionary AudioEncoderConfig {
+  FlacEncoderConfig flac;
+};
+
+dictionary FlacEncoderConfig {
+  [EnforceRange] unsigned long blockSize = 0;
+  [EnforceRange] unsigned long compressLevel = 5;
+};
diff --git a/test/wpt/tests/interfaces/webcodecs-hevc-codec-registration.idl b/test/wpt/tests/interfaces/webcodecs-hevc-codec-registration.idl
new file mode 100644
index 00000000000..b767db89e6f
--- /dev/null
+++ b/test/wpt/tests/interfaces/webcodecs-hevc-codec-registration.idl
@@ -0,0 +1,17 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: HEVC (H.265) WebCodecs Registration (https://w3c.github.io/webcodecs/hevc_codec_registration.html)
+
+partial dictionary VideoEncoderConfig {
+  HevcEncoderConfig hevc;
+};
+
+dictionary HevcEncoderConfig {
+  HevcBitstreamFormat format = "hevc";
+};
+
+enum HevcBitstreamFormat {
+  "annexb",
+  "hevc",
+};
diff --git a/test/wpt/tests/interfaces/webcodecs-opus-codec-registration.idl b/test/wpt/tests/interfaces/webcodecs-opus-codec-registration.idl
new file mode 100644
index 00000000000..0d198a6bcde
--- /dev/null
+++ b/test/wpt/tests/interfaces/webcodecs-opus-codec-registration.idl
@@ -0,0 +1,22 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Opus WebCodecs Registration (https://w3c.github.io/webcodecs/opus_codec_registration.html)
+
+partial dictionary AudioEncoderConfig {
+  OpusEncoderConfig opus;
+};
+
+dictionary OpusEncoderConfig {
+  OpusBitstreamFormat format = "opus";
+  [EnforceRange] unsigned long long frameDuration = 20000;
+  [EnforceRange] unsigned long complexity;
+  [EnforceRange] unsigned long packetlossperc = 0;
+  boolean useinbandfec = false;
+  boolean usedtx = false;
+};
+
+enum OpusBitstreamFormat {
+  "opus",
+  "ogg",
+};
diff --git a/test/wpt/tests/interfaces/webcodecs.idl b/test/wpt/tests/interfaces/webcodecs.idl
new file mode 100644
index 00000000000..68df48584bd
--- /dev/null
+++ b/test/wpt/tests/interfaces/webcodecs.idl
@@ -0,0 +1,494 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: WebCodecs (https://w3c.github.io/webcodecs/)
+
+[Exposed=(Window,DedicatedWorker), SecureContext]
+interface AudioDecoder {
+  constructor(AudioDecoderInit init);
+
+  readonly attribute CodecState state;
+  readonly attribute unsigned long decodeQueueSize;
+  attribute EventHandler ondequeue;
+
+  undefined configure(AudioDecoderConfig config);
+  undefined decode(EncodedAudioChunk chunk);
+  Promise<undefined> flush();
+  undefined reset();
+  undefined close();
+
+  static Promise<AudioDecoderSupport> isConfigSupported(AudioDecoderConfig config);
+};
+
+dictionary AudioDecoderInit {
+  required AudioDataOutputCallback output;
+  required WebCodecsErrorCallback error;
+};
+
+callback AudioDataOutputCallback = undefined(AudioData output);
+
+[Exposed=(Window,DedicatedWorker), SecureContext]
+interface VideoDecoder {
+  constructor(VideoDecoderInit init);
+
+  readonly attribute CodecState state;
+  readonly attribute unsigned long decodeQueueSize;
+  attribute EventHandler ondequeue;
+
+  undefined configure(VideoDecoderConfig config);
+  undefined decode(EncodedVideoChunk chunk);
+  Promise<undefined> flush();
+  undefined reset();
+  undefined close();
+
+  static Promise<VideoDecoderSupport> isConfigSupported(VideoDecoderConfig config);
+};
+
+dictionary VideoDecoderInit {
+  required VideoFrameOutputCallback output;
+  required WebCodecsErrorCallback error;
+};
+
+callback VideoFrameOutputCallback = undefined(VideoFrame output);
+
+[Exposed=(Window,DedicatedWorker), SecureContext]
+interface AudioEncoder {
+  constructor(AudioEncoderInit init);
+
+  readonly attribute CodecState state;
+  readonly attribute unsigned long encodeQueueSize;
+  attribute EventHandler ondequeue;
+
+  undefined configure(AudioEncoderConfig config);
+  undefined encode(AudioData data);
+  Promise<undefined> flush();
+  undefined reset();
+  undefined close();
+
+  static Promise<AudioEncoderSupport> isConfigSupported(AudioEncoderConfig config);
+};
+
+dictionary AudioEncoderInit {
+  required EncodedAudioChunkOutputCallback output;
+  required WebCodecsErrorCallback error;
+};
+
+callback EncodedAudioChunkOutputCallback =
+    undefined (EncodedAudioChunk output,
+               optional EncodedAudioChunkMetadata metadata = {});
+
+dictionary EncodedAudioChunkMetadata {
+  AudioDecoderConfig decoderConfig;
+};
+
+[Exposed=(Window,DedicatedWorker), SecureContext]
+interface VideoEncoder {
+  constructor(VideoEncoderInit init);
+
+  readonly attribute CodecState state;
+  readonly attribute unsigned long encodeQueueSize;
+  attribute EventHandler ondequeue;
+
+  undefined configure(VideoEncoderConfig config);
+  undefined encode(VideoFrame frame, optional VideoEncoderEncodeOptions options = {});
+  Promise<undefined> flush();
+  undefined reset();
+  undefined close();
+
+  static Promise<VideoEncoderSupport> isConfigSupported(VideoEncoderConfig config);
+};
+
+dictionary VideoEncoderInit {
+  required EncodedVideoChunkOutputCallback output;
+  required WebCodecsErrorCallback error;
+};
+
+callback EncodedVideoChunkOutputCallback =
+    undefined (EncodedVideoChunk chunk,
+               optional EncodedVideoChunkMetadata metadata = {});
+
+dictionary EncodedVideoChunkMetadata {
+  VideoDecoderConfig decoderConfig;
+  SvcOutputMetadata svc;
+  BufferSource alphaSideData;
+};
+
+dictionary SvcOutputMetadata {
+  unsigned long temporalLayerId;
+};
+
+dictionary AudioDecoderSupport {
+  boolean supported;
+  AudioDecoderConfig config;
+};
+
+dictionary VideoDecoderSupport {
+  boolean supported;
+  VideoDecoderConfig config;
+};
+
+dictionary AudioEncoderSupport {
+  boolean supported;
+  AudioEncoderConfig config;
+};
+
+dictionary VideoEncoderSupport {
+  boolean supported;
+  VideoEncoderConfig config;
+};
+
+dictionary AudioDecoderConfig {
+  required DOMString codec;
+  [EnforceRange] required unsigned long sampleRate;
+  [EnforceRange] required unsigned long numberOfChannels;
+  BufferSource description;
+};
+
+dictionary VideoDecoderConfig {
+  required DOMString codec;
+  [AllowShared] BufferSource description;
+  [EnforceRange] unsigned long codedWidth;
+  [EnforceRange] unsigned long codedHeight;
+  [EnforceRange] unsigned long displayAspectWidth;
+  [EnforceRange] unsigned long displayAspectHeight;
+  VideoColorSpaceInit colorSpace;
+  HardwareAcceleration hardwareAcceleration = "no-preference";
+  boolean optimizeForLatency;
+};
+
+dictionary AudioEncoderConfig {
+  required DOMString codec;
+  [EnforceRange] unsigned long sampleRate;
+  [EnforceRange] unsigned long numberOfChannels;
+  [EnforceRange] unsigned long long bitrate;
+};
+
+dictionary VideoEncoderConfig {
+  required DOMString codec;
+  [EnforceRange] required unsigned long width;
+  [EnforceRange] required unsigned long height;
+  [EnforceRange] unsigned long displayWidth;
+  [EnforceRange] unsigned long displayHeight;
+  [EnforceRange] unsigned long long bitrate;
+  double framerate;
+  HardwareAcceleration hardwareAcceleration = "no-preference";
+  AlphaOption alpha = "discard";
+  DOMString scalabilityMode;
+  BitrateMode bitrateMode = "variable";
+  LatencyMode latencyMode = "quality";
+};
+
+enum HardwareAcceleration {
+  "no-preference",
+  "prefer-hardware",
+  "prefer-software",
+};
+
+enum AlphaOption {
+  "keep",
+  "discard",
+};
+
+enum LatencyMode {
+  "quality",
+  "realtime"
+};
+
+dictionary VideoEncoderEncodeOptions {
+  boolean keyFrame = false;
+};
+
+enum CodecState {
+  "unconfigured",
+  "configured",
+  "closed"
+};
+
+callback WebCodecsErrorCallback = undefined(DOMException error);
+
+[Exposed=(Window,DedicatedWorker), Serializable]
+interface EncodedAudioChunk {
+  constructor(EncodedAudioChunkInit init);
+  readonly attribute EncodedAudioChunkType type;
+  readonly attribute long long timestamp;          // microseconds
+  readonly attribute unsigned long long? duration; // microseconds
+  readonly attribute unsigned long byteLength;
+
+  undefined copyTo([AllowShared] BufferSource destination);
+};
+
+dictionary EncodedAudioChunkInit {
+  required EncodedAudioChunkType type;
+  [EnforceRange] required long long timestamp;    // microseconds
+  [EnforceRange] unsigned long long duration;     // microseconds
+  required BufferSource data;
+};
+
+enum EncodedAudioChunkType {
+    "key",
+    "delta",
+};
+
+[Exposed=(Window,DedicatedWorker), Serializable]
+interface EncodedVideoChunk {
+  constructor(EncodedVideoChunkInit init);
+  readonly attribute EncodedVideoChunkType type;
+  readonly attribute long long timestamp;             // microseconds
+  readonly attribute unsigned long long? duration;    // microseconds
+  readonly attribute unsigned long byteLength;
+
+  undefined copyTo([AllowShared] BufferSource destination);
+};
+
+dictionary EncodedVideoChunkInit {
+  required EncodedVideoChunkType type;
+  [EnforceRange] required long long timestamp;        // microseconds
+  [EnforceRange] unsigned long long duration;         // microseconds
+  required [AllowShared] BufferSource data;
+};
+
+enum EncodedVideoChunkType {
+    "key",
+    "delta",
+};
+
+[Exposed=(Window,DedicatedWorker), Serializable, Transferable]
+interface AudioData {
+  constructor(AudioDataInit init);
+
+  readonly attribute AudioSampleFormat? format;
+  readonly attribute float sampleRate;
+  readonly attribute unsigned long numberOfFrames;
+  readonly attribute unsigned long numberOfChannels;
+  readonly attribute unsigned long long duration;  // microseconds
+  readonly attribute long long timestamp;          // microseconds
+
+  unsigned long allocationSize(AudioDataCopyToOptions options);
+  undefined copyTo([AllowShared] BufferSource destination, AudioDataCopyToOptions options);
+  AudioData clone();
+  undefined close();
+};
+
+dictionary AudioDataInit {
+  required AudioSampleFormat format;
+  required float sampleRate;
+  [EnforceRange] required unsigned long numberOfFrames;
+  [EnforceRange] required unsigned long numberOfChannels;
+  [EnforceRange] required long long timestamp;  // microseconds
+  required BufferSource data;
+};
+
+dictionary AudioDataCopyToOptions {
+  [EnforceRange] required unsigned long planeIndex;
+  [EnforceRange] unsigned long frameOffset = 0;
+  [EnforceRange] unsigned long frameCount;
+  AudioSampleFormat format;
+};
+
+enum AudioSampleFormat {
+  "u8",
+  "s16",
+  "s32",
+  "f32",
+  "u8-planar",
+  "s16-planar",
+  "s32-planar",
+  "f32-planar",
+};
+
+[Exposed=(Window,DedicatedWorker), Serializable, Transferable]
+interface VideoFrame {
+  constructor(CanvasImageSource image, optional VideoFrameInit init = {});
+  constructor([AllowShared] BufferSource data, VideoFrameBufferInit init);
+
+  readonly attribute VideoPixelFormat? format;
+  readonly attribute unsigned long codedWidth;
+  readonly attribute unsigned long codedHeight;
+  readonly attribute DOMRectReadOnly? codedRect;
+  readonly attribute DOMRectReadOnly? visibleRect;
+  readonly attribute unsigned long displayWidth;
+  readonly attribute unsigned long displayHeight;
+  readonly attribute unsigned long long? duration;  // microseconds
+  readonly attribute long long timestamp;           // microseconds
+  readonly attribute VideoColorSpace colorSpace;
+
+  VideoFrameMetadata metadata();
+
+  unsigned long allocationSize(
+      optional VideoFrameCopyToOptions options = {});
+  Promise<sequence<PlaneLayout>> copyTo(
+      [AllowShared] BufferSource destination,
+      optional VideoFrameCopyToOptions options = {});
+  VideoFrame clone();
+  undefined close();
+};
+
+dictionary VideoFrameInit {
+  unsigned long long duration;  // microseconds
+  long long timestamp;          // microseconds
+  AlphaOption alpha = "keep";
+
+  // Default matches image. May be used to efficiently crop. Will trigger
+  // new computation of displayWidth and displayHeight using image’s pixel
+  // aspect ratio unless an explicit displayWidth and displayHeight are given.
+  DOMRectInit visibleRect;
+
+  // Default matches image unless visibleRect is provided.
+  [EnforceRange] unsigned long displayWidth;
+  [EnforceRange] unsigned long displayHeight;
+
+  VideoFrameMetadata metadata;
+};
+
+dictionary VideoFrameBufferInit {
+  required VideoPixelFormat format;
+  required [EnforceRange] unsigned long codedWidth;
+  required [EnforceRange] unsigned long codedHeight;
+  required [EnforceRange] long long timestamp;  // microseconds
+  [EnforceRange] unsigned long long duration;  // microseconds
+
+  // Default layout is tightly-packed.
+  sequence<PlaneLayout> layout;
+
+  // Default visible rect is coded size positioned at (0,0)
+  DOMRectInit visibleRect;
+
+  // Default display dimensions match visibleRect.
+  [EnforceRange] unsigned long displayWidth;
+  [EnforceRange] unsigned long displayHeight;
+
+  VideoColorSpaceInit colorSpace;
+};
+
+dictionary VideoFrameMetadata {
+  // Possible members are recorded in the VideoFrame Metadata Registry.
+};
+
+dictionary VideoFrameCopyToOptions {
+  DOMRectInit rect;
+  sequence<PlaneLayout> layout;
+};
+
+dictionary PlaneLayout {
+  [EnforceRange] required unsigned long offset;
+  [EnforceRange] required unsigned long stride;
+};
+
+enum VideoPixelFormat {
+  // 4:2:0 Y, U, V
+  "I420",
+  // 4:2:0 Y, U, V, A
+  "I420A",
+  // 4:2:2 Y, U, V
+  "I422",
+  // 4:4:4 Y, U, V
+  "I444",
+  // 4:2:0 Y, UV
+  "NV12",
+  // 32bpp RGBA
+  "RGBA",
+  // 32bpp RGBX (opaque)
+  "RGBX",
+  // 32bpp BGRA
+  "BGRA",
+  // 32bpp BGRX (opaque)
+  "BGRX",
+};
+
+[Exposed=(Window,DedicatedWorker)]
+interface VideoColorSpace {
+  constructor(optional VideoColorSpaceInit init = {});
+
+  readonly attribute VideoColorPrimaries? primaries;
+  readonly attribute VideoTransferCharacteristics? transfer;
+  readonly attribute VideoMatrixCoefficients? matrix;
+  readonly attribute boolean? fullRange;
+
+  [Default] VideoColorSpaceInit toJSON();
+};
+
+dictionary VideoColorSpaceInit {
+  VideoColorPrimaries? primaries = null;
+  VideoTransferCharacteristics? transfer = null;
+  VideoMatrixCoefficients? matrix = null;
+  boolean? fullRange = null;
+};
+
+enum VideoColorPrimaries {
+  "bt709",
+  "bt470bg",
+  "smpte170m",
+  "bt2020",
+  "smpte432",
+};
+
+enum VideoTransferCharacteristics {
+  "bt709",
+  "smpte170m",
+  "iec61966-2-1",
+  "linear",
+  "pq",
+  "hlg",
+};
+
+enum VideoMatrixCoefficients {
+  "rgb",
+  "bt709",
+  "bt470bg",
+  "smpte170m",
+  "bt2020-ncl",
+};
+
+[Exposed=(Window,DedicatedWorker), SecureContext]
+interface ImageDecoder {
+  constructor(ImageDecoderInit init);
+
+  readonly attribute DOMString type;
+  readonly attribute boolean complete;
+  readonly attribute Promise<undefined> completed;
+  readonly attribute ImageTrackList tracks;
+
+  Promise<ImageDecodeResult> decode(optional ImageDecodeOptions options = {});
+  undefined reset();
+  undefined close();
+
+  static Promise<boolean> isTypeSupported(DOMString type);
+};
+
+typedef (BufferSource or ReadableStream) ImageBufferSource;
+dictionary ImageDecoderInit {
+  required DOMString type;
+  required ImageBufferSource data;
+  ColorSpaceConversion colorSpaceConversion = "default";
+  [EnforceRange] unsigned long desiredWidth;
+  [EnforceRange] unsigned long desiredHeight;
+  boolean preferAnimation;
+};
+
+dictionary ImageDecodeOptions {
+  [EnforceRange] unsigned long frameIndex = 0;
+  boolean completeFramesOnly = true;
+};
+
+dictionary ImageDecodeResult {
+  required VideoFrame image;
+  required boolean complete;
+};
+
+[Exposed=(Window,DedicatedWorker)]
+interface ImageTrackList {
+  getter ImageTrack (unsigned long index);
+
+  readonly attribute Promise<undefined> ready;
+  readonly attribute unsigned long length;
+  readonly attribute long selectedIndex;
+  readonly attribute ImageTrack? selectedTrack;
+};
+
+[Exposed=(Window,DedicatedWorker)]
+interface ImageTrack {
+  readonly attribute boolean animated;
+  readonly attribute unsigned long frameCount;
+  readonly attribute unrestricted float repetitionCount;
+  attribute boolean selected;
+};
diff --git a/test/wpt/tests/interfaces/webcrypto-secure-curves.idl b/test/wpt/tests/interfaces/webcrypto-secure-curves.idl
new file mode 100644
index 00000000000..01bb290b747
--- /dev/null
+++ b/test/wpt/tests/interfaces/webcrypto-secure-curves.idl
@@ -0,0 +1,8 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Secure Curves in the Web Cryptography API (https://wicg.github.io/webcrypto-secure-curves/)
+
+dictionary Ed448Params : Algorithm {
+  BufferSource context;
+};
diff --git a/test/wpt/tests/interfaces/webdriver.idl b/test/wpt/tests/interfaces/webdriver.idl
new file mode 100644
index 00000000000..194e2d806ad
--- /dev/null
+++ b/test/wpt/tests/interfaces/webdriver.idl
@@ -0,0 +1,9 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: WebDriver (https://w3c.github.io/webdriver/)
+
+interface mixin NavigatorAutomationInformation {
+  readonly attribute boolean webdriver;
+};
+Navigator includes NavigatorAutomationInformation;
diff --git a/test/wpt/tests/interfaces/webgl1.idl b/test/wpt/tests/interfaces/webgl1.idl
new file mode 100644
index 00000000000..3912e9a4b04
--- /dev/null
+++ b/test/wpt/tests/interfaces/webgl1.idl
@@ -0,0 +1,745 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: WebGL Specification (https://registry.khronos.org/webgl/specs/latest/1.0/)
+
+typedef unsigned long  GLenum;
+typedef boolean        GLboolean;
+typedef unsigned long  GLbitfield;
+typedef byte           GLbyte;         /* 'byte' should be a signed 8 bit type. */
+typedef short          GLshort;
+typedef long           GLint;
+typedef long           GLsizei;
+typedef long long      GLintptr;
+typedef long long      GLsizeiptr;
+// Ideally the typedef below would use 'unsigned byte', but that doesn't currently exist in Web IDL.
+typedef octet          GLubyte;        /* 'octet' should be an unsigned 8 bit type. */
+typedef unsigned short GLushort;
+typedef unsigned long  GLuint;
+typedef unrestricted float GLfloat;
+typedef unrestricted float GLclampf;
+
+// The power preference settings are documented in the WebGLContextAttributes
+// section of the specification.
+enum WebGLPowerPreference { "default", "low-power", "high-performance" };
+
+dictionary WebGLContextAttributes {
+    boolean alpha = true;
+    boolean depth = true;
+    boolean stencil = false;
+    boolean antialias = true;
+    boolean premultipliedAlpha = true;
+    boolean preserveDrawingBuffer = false;
+    WebGLPowerPreference powerPreference = "default";
+    boolean failIfMajorPerformanceCaveat = false;
+    boolean desynchronized = false;
+};
+
+[Exposed=(Window,Worker)]
+interface WebGLObject {
+};
+
+[Exposed=(Window,Worker)]
+interface WebGLBuffer : WebGLObject {
+};
+
+[Exposed=(Window,Worker)]
+interface WebGLFramebuffer : WebGLObject {
+};
+
+[Exposed=(Window,Worker)]
+interface WebGLProgram : WebGLObject {
+};
+
+[Exposed=(Window,Worker)]
+interface WebGLRenderbuffer : WebGLObject {
+};
+
+[Exposed=(Window,Worker)]
+interface WebGLShader : WebGLObject {
+};
+
+[Exposed=(Window,Worker)]
+interface WebGLTexture : WebGLObject {
+};
+
+[Exposed=(Window,Worker)]
+interface WebGLUniformLocation {
+};
+
+[Exposed=(Window,Worker)]
+interface WebGLActiveInfo {
+    readonly attribute GLint size;
+    readonly attribute GLenum type;
+    readonly attribute DOMString name;
+};
+
+[Exposed=(Window,Worker)]
+interface WebGLShaderPrecisionFormat {
+    readonly attribute GLint rangeMin;
+    readonly attribute GLint rangeMax;
+    readonly attribute GLint precision;
+};
+
+typedef (ImageBitmap or
+         ImageData or
+         HTMLImageElement or
+         HTMLCanvasElement or
+         HTMLVideoElement or
+         OffscreenCanvas or
+         VideoFrame) TexImageSource;
+
+typedef ([AllowShared] Float32Array or sequence<GLfloat>) Float32List;
+typedef ([AllowShared] Int32Array or sequence<GLint>) Int32List;
+
+interface mixin WebGLRenderingContextBase
+{
+
+    /* ClearBufferMask */
+    const GLenum DEPTH_BUFFER_BIT               = 0x00000100;
+    const GLenum STENCIL_BUFFER_BIT             = 0x00000400;
+    const GLenum COLOR_BUFFER_BIT               = 0x00004000;
+
+    /* BeginMode */
+    const GLenum POINTS                         = 0x0000;
+    const GLenum LINES                          = 0x0001;
+    const GLenum LINE_LOOP                      = 0x0002;
+    const GLenum LINE_STRIP                     = 0x0003;
+    const GLenum TRIANGLES                      = 0x0004;
+    const GLenum TRIANGLE_STRIP                 = 0x0005;
+    const GLenum TRIANGLE_FAN                   = 0x0006;
+
+    /* AlphaFunction (not supported in ES20) */
+    /*      NEVER */
+    /*      LESS */
+    /*      EQUAL */
+    /*      LEQUAL */
+    /*      GREATER */
+    /*      NOTEQUAL */
+    /*      GEQUAL */
+    /*      ALWAYS */
+
+    /* BlendingFactorDest */
+    const GLenum ZERO                           = 0;
+    const GLenum ONE                            = 1;
+    const GLenum SRC_COLOR                      = 0x0300;
+    const GLenum ONE_MINUS_SRC_COLOR            = 0x0301;
+    const GLenum SRC_ALPHA                      = 0x0302;
+    const GLenum ONE_MINUS_SRC_ALPHA            = 0x0303;
+    const GLenum DST_ALPHA                      = 0x0304;
+    const GLenum ONE_MINUS_DST_ALPHA            = 0x0305;
+
+    /* BlendingFactorSrc */
+    /*      ZERO */
+    /*      ONE */
+    const GLenum DST_COLOR                      = 0x0306;
+    const GLenum ONE_MINUS_DST_COLOR            = 0x0307;
+    const GLenum SRC_ALPHA_SATURATE             = 0x0308;
+    /*      SRC_ALPHA */
+    /*      ONE_MINUS_SRC_ALPHA */
+    /*      DST_ALPHA */
+    /*      ONE_MINUS_DST_ALPHA */
+
+    /* BlendEquationSeparate */
+    const GLenum FUNC_ADD                       = 0x8006;
+    const GLenum BLEND_EQUATION                 = 0x8009;
+    const GLenum BLEND_EQUATION_RGB             = 0x8009;   /* same as BLEND_EQUATION */
+    const GLenum BLEND_EQUATION_ALPHA           = 0x883D;
+
+    /* BlendSubtract */
+    const GLenum FUNC_SUBTRACT                  = 0x800A;
+    const GLenum FUNC_REVERSE_SUBTRACT          = 0x800B;
+
+    /* Separate Blend Functions */
+    const GLenum BLEND_DST_RGB                  = 0x80C8;
+    const GLenum BLEND_SRC_RGB                  = 0x80C9;
+    const GLenum BLEND_DST_ALPHA                = 0x80CA;
+    const GLenum BLEND_SRC_ALPHA                = 0x80CB;
+    const GLenum CONSTANT_COLOR                 = 0x8001;
+    const GLenum ONE_MINUS_CONSTANT_COLOR       = 0x8002;
+    const GLenum CONSTANT_ALPHA                 = 0x8003;
+    const GLenum ONE_MINUS_CONSTANT_ALPHA       = 0x8004;
+    const GLenum BLEND_COLOR                    = 0x8005;
+
+    /* Buffer Objects */
+    const GLenum ARRAY_BUFFER                   = 0x8892;
+    const GLenum ELEMENT_ARRAY_BUFFER           = 0x8893;
+    const GLenum ARRAY_BUFFER_BINDING           = 0x8894;
+    const GLenum ELEMENT_ARRAY_BUFFER_BINDING   = 0x8895;
+
+    const GLenum STREAM_DRAW                    = 0x88E0;
+    const GLenum STATIC_DRAW                    = 0x88E4;
+    const GLenum DYNAMIC_DRAW                   = 0x88E8;
+
+    const GLenum BUFFER_SIZE                    = 0x8764;
+    const GLenum BUFFER_USAGE                   = 0x8765;
+
+    const GLenum CURRENT_VERTEX_ATTRIB          = 0x8626;
+
+    /* CullFaceMode */
+    const GLenum FRONT                          = 0x0404;
+    const GLenum BACK                           = 0x0405;
+    const GLenum FRONT_AND_BACK                 = 0x0408;
+
+    /* DepthFunction */
+    /*      NEVER */
+    /*      LESS */
+    /*      EQUAL */
+    /*      LEQUAL */
+    /*      GREATER */
+    /*      NOTEQUAL */
+    /*      GEQUAL */
+    /*      ALWAYS */
+
+    /* EnableCap */
+    /* TEXTURE_2D */
+    const GLenum CULL_FACE                      = 0x0B44;
+    const GLenum BLEND                          = 0x0BE2;
+    const GLenum DITHER                         = 0x0BD0;
+    const GLenum STENCIL_TEST                   = 0x0B90;
+    const GLenum DEPTH_TEST                     = 0x0B71;
+    const GLenum SCISSOR_TEST                   = 0x0C11;
+    const GLenum POLYGON_OFFSET_FILL            = 0x8037;
+    const GLenum SAMPLE_ALPHA_TO_COVERAGE       = 0x809E;
+    const GLenum SAMPLE_COVERAGE                = 0x80A0;
+
+    /* ErrorCode */
+    const GLenum NO_ERROR                       = 0;
+    const GLenum INVALID_ENUM                   = 0x0500;
+    const GLenum INVALID_VALUE                  = 0x0501;
+    const GLenum INVALID_OPERATION              = 0x0502;
+    const GLenum OUT_OF_MEMORY                  = 0x0505;
+
+    /* FrontFaceDirection */
+    const GLenum CW                             = 0x0900;
+    const GLenum CCW                            = 0x0901;
+
+    /* GetPName */
+    const GLenum LINE_WIDTH                     = 0x0B21;
+    const GLenum ALIASED_POINT_SIZE_RANGE       = 0x846D;
+    const GLenum ALIASED_LINE_WIDTH_RANGE       = 0x846E;
+    const GLenum CULL_FACE_MODE                 = 0x0B45;
+    const GLenum FRONT_FACE                     = 0x0B46;
+    const GLenum DEPTH_RANGE                    = 0x0B70;
+    const GLenum DEPTH_WRITEMASK                = 0x0B72;
+    const GLenum DEPTH_CLEAR_VALUE              = 0x0B73;
+    const GLenum DEPTH_FUNC                     = 0x0B74;
+    const GLenum STENCIL_CLEAR_VALUE            = 0x0B91;
+    const GLenum STENCIL_FUNC                   = 0x0B92;
+    const GLenum STENCIL_FAIL                   = 0x0B94;
+    const GLenum STENCIL_PASS_DEPTH_FAIL        = 0x0B95;
+    const GLenum STENCIL_PASS_DEPTH_PASS        = 0x0B96;
+    const GLenum STENCIL_REF                    = 0x0B97;
+    const GLenum STENCIL_VALUE_MASK             = 0x0B93;
+    const GLenum STENCIL_WRITEMASK              = 0x0B98;
+    const GLenum STENCIL_BACK_FUNC              = 0x8800;
+    const GLenum STENCIL_BACK_FAIL              = 0x8801;
+    const GLenum STENCIL_BACK_PASS_DEPTH_FAIL   = 0x8802;
+    const GLenum STENCIL_BACK_PASS_DEPTH_PASS   = 0x8803;
+    const GLenum STENCIL_BACK_REF               = 0x8CA3;
+    const GLenum STENCIL_BACK_VALUE_MASK        = 0x8CA4;
+    const GLenum STENCIL_BACK_WRITEMASK         = 0x8CA5;
+    const GLenum VIEWPORT                       = 0x0BA2;
+    const GLenum SCISSOR_BOX                    = 0x0C10;
+    /*      SCISSOR_TEST */
+    const GLenum COLOR_CLEAR_VALUE              = 0x0C22;
+    const GLenum COLOR_WRITEMASK                = 0x0C23;
+    const GLenum UNPACK_ALIGNMENT               = 0x0CF5;
+    const GLenum PACK_ALIGNMENT                 = 0x0D05;
+    const GLenum MAX_TEXTURE_SIZE               = 0x0D33;
+    const GLenum MAX_VIEWPORT_DIMS              = 0x0D3A;
+    const GLenum SUBPIXEL_BITS                  = 0x0D50;
+    const GLenum RED_BITS                       = 0x0D52;
+    const GLenum GREEN_BITS                     = 0x0D53;
+    const GLenum BLUE_BITS                      = 0x0D54;
+    const GLenum ALPHA_BITS                     = 0x0D55;
+    const GLenum DEPTH_BITS                     = 0x0D56;
+    const GLenum STENCIL_BITS                   = 0x0D57;
+    const GLenum POLYGON_OFFSET_UNITS           = 0x2A00;
+    /*      POLYGON_OFFSET_FILL */
+    const GLenum POLYGON_OFFSET_FACTOR          = 0x8038;
+    const GLenum TEXTURE_BINDING_2D             = 0x8069;
+    const GLenum SAMPLE_BUFFERS                 = 0x80A8;
+    const GLenum SAMPLES                        = 0x80A9;
+    const GLenum SAMPLE_COVERAGE_VALUE          = 0x80AA;
+    const GLenum SAMPLE_COVERAGE_INVERT         = 0x80AB;
+
+    /* GetTextureParameter */
+    /*      TEXTURE_MAG_FILTER */
+    /*      TEXTURE_MIN_FILTER */
+    /*      TEXTURE_WRAP_S */
+    /*      TEXTURE_WRAP_T */
+
+    const GLenum COMPRESSED_TEXTURE_FORMATS     = 0x86A3;
+
+    /* HintMode */
+    const GLenum DONT_CARE                      = 0x1100;
+    const GLenum FASTEST                        = 0x1101;
+    const GLenum NICEST                         = 0x1102;
+
+    /* HintTarget */
+    const GLenum GENERATE_MIPMAP_HINT            = 0x8192;
+
+    /* DataType */
+    const GLenum BYTE                           = 0x1400;
+    const GLenum UNSIGNED_BYTE                  = 0x1401;
+    const GLenum SHORT                          = 0x1402;
+    const GLenum UNSIGNED_SHORT                 = 0x1403;
+    const GLenum INT                            = 0x1404;
+    const GLenum UNSIGNED_INT                   = 0x1405;
+    const GLenum FLOAT                          = 0x1406;
+
+    /* PixelFormat */
+    const GLenum DEPTH_COMPONENT                = 0x1902;
+    const GLenum ALPHA                          = 0x1906;
+    const GLenum RGB                            = 0x1907;
+    const GLenum RGBA                           = 0x1908;
+    const GLenum LUMINANCE                      = 0x1909;
+    const GLenum LUMINANCE_ALPHA                = 0x190A;
+
+    /* PixelType */
+    /*      UNSIGNED_BYTE */
+    const GLenum UNSIGNED_SHORT_4_4_4_4         = 0x8033;
+    const GLenum UNSIGNED_SHORT_5_5_5_1         = 0x8034;
+    const GLenum UNSIGNED_SHORT_5_6_5           = 0x8363;
+
+    /* Shaders */
+    const GLenum FRAGMENT_SHADER                  = 0x8B30;
+    const GLenum VERTEX_SHADER                    = 0x8B31;
+    const GLenum MAX_VERTEX_ATTRIBS               = 0x8869;
+    const GLenum MAX_VERTEX_UNIFORM_VECTORS       = 0x8DFB;
+    const GLenum MAX_VARYING_VECTORS              = 0x8DFC;
+    const GLenum MAX_COMBINED_TEXTURE_IMAGE_UNITS = 0x8B4D;
+    const GLenum MAX_VERTEX_TEXTURE_IMAGE_UNITS   = 0x8B4C;
+    const GLenum MAX_TEXTURE_IMAGE_UNITS          = 0x8872;
+    const GLenum MAX_FRAGMENT_UNIFORM_VECTORS     = 0x8DFD;
+    const GLenum SHADER_TYPE                      = 0x8B4F;
+    const GLenum DELETE_STATUS                    = 0x8B80;
+    const GLenum LINK_STATUS                      = 0x8B82;
+    const GLenum VALIDATE_STATUS                  = 0x8B83;
+    const GLenum ATTACHED_SHADERS                 = 0x8B85;
+    const GLenum ACTIVE_UNIFORMS                  = 0x8B86;
+    const GLenum ACTIVE_ATTRIBUTES                = 0x8B89;
+    const GLenum SHADING_LANGUAGE_VERSION         = 0x8B8C;
+    const GLenum CURRENT_PROGRAM                  = 0x8B8D;
+
+    /* StencilFunction */
+    const GLenum NEVER                          = 0x0200;
+    const GLenum LESS                           = 0x0201;
+    const GLenum EQUAL                          = 0x0202;
+    const GLenum LEQUAL                         = 0x0203;
+    const GLenum GREATER                        = 0x0204;
+    const GLenum NOTEQUAL                       = 0x0205;
+    const GLenum GEQUAL                         = 0x0206;
+    const GLenum ALWAYS                         = 0x0207;
+
+    /* StencilOp */
+    /*      ZERO */
+    const GLenum KEEP                           = 0x1E00;
+    const GLenum REPLACE                        = 0x1E01;
+    const GLenum INCR                           = 0x1E02;
+    const GLenum DECR                           = 0x1E03;
+    const GLenum INVERT                         = 0x150A;
+    const GLenum INCR_WRAP                      = 0x8507;
+    const GLenum DECR_WRAP                      = 0x8508;
+
+    /* StringName */
+    const GLenum VENDOR                         = 0x1F00;
+    const GLenum RENDERER                       = 0x1F01;
+    const GLenum VERSION                        = 0x1F02;
+
+    /* TextureMagFilter */
+    const GLenum NEAREST                        = 0x2600;
+    const GLenum LINEAR                         = 0x2601;
+
+    /* TextureMinFilter */
+    /*      NEAREST */
+    /*      LINEAR */
+    const GLenum NEAREST_MIPMAP_NEAREST         = 0x2700;
+    const GLenum LINEAR_MIPMAP_NEAREST          = 0x2701;
+    const GLenum NEAREST_MIPMAP_LINEAR          = 0x2702;
+    const GLenum LINEAR_MIPMAP_LINEAR           = 0x2703;
+
+    /* TextureParameterName */
+    const GLenum TEXTURE_MAG_FILTER             = 0x2800;
+    const GLenum TEXTURE_MIN_FILTER             = 0x2801;
+    const GLenum TEXTURE_WRAP_S                 = 0x2802;
+    const GLenum TEXTURE_WRAP_T                 = 0x2803;
+
+    /* TextureTarget */
+    const GLenum TEXTURE_2D                     = 0x0DE1;
+    const GLenum TEXTURE                        = 0x1702;
+
+    const GLenum TEXTURE_CUBE_MAP               = 0x8513;
+    const GLenum TEXTURE_BINDING_CUBE_MAP       = 0x8514;
+    const GLenum TEXTURE_CUBE_MAP_POSITIVE_X    = 0x8515;
+    const GLenum TEXTURE_CUBE_MAP_NEGATIVE_X    = 0x8516;
+    const GLenum TEXTURE_CUBE_MAP_POSITIVE_Y    = 0x8517;
+    const GLenum TEXTURE_CUBE_MAP_NEGATIVE_Y    = 0x8518;
+    const GLenum TEXTURE_CUBE_MAP_POSITIVE_Z    = 0x8519;
+    const GLenum TEXTURE_CUBE_MAP_NEGATIVE_Z    = 0x851A;
+    const GLenum MAX_CUBE_MAP_TEXTURE_SIZE      = 0x851C;
+
+    /* TextureUnit */
+    const GLenum TEXTURE0                       = 0x84C0;
+    const GLenum TEXTURE1                       = 0x84C1;
+    const GLenum TEXTURE2                       = 0x84C2;
+    const GLenum TEXTURE3                       = 0x84C3;
+    const GLenum TEXTURE4                       = 0x84C4;
+    const GLenum TEXTURE5                       = 0x84C5;
+    const GLenum TEXTURE6                       = 0x84C6;
+    const GLenum TEXTURE7                       = 0x84C7;
+    const GLenum TEXTURE8                       = 0x84C8;
+    const GLenum TEXTURE9                       = 0x84C9;
+    const GLenum TEXTURE10                      = 0x84CA;
+    const GLenum TEXTURE11                      = 0x84CB;
+    const GLenum TEXTURE12                      = 0x84CC;
+    const GLenum TEXTURE13                      = 0x84CD;
+    const GLenum TEXTURE14                      = 0x84CE;
+    const GLenum TEXTURE15                      = 0x84CF;
+    const GLenum TEXTURE16                      = 0x84D0;
+    const GLenum TEXTURE17                      = 0x84D1;
+    const GLenum TEXTURE18                      = 0x84D2;
+    const GLenum TEXTURE19                      = 0x84D3;
+    const GLenum TEXTURE20                      = 0x84D4;
+    const GLenum TEXTURE21                      = 0x84D5;
+    const GLenum TEXTURE22                      = 0x84D6;
+    const GLenum TEXTURE23                      = 0x84D7;
+    const GLenum TEXTURE24                      = 0x84D8;
+    const GLenum TEXTURE25                      = 0x84D9;
+    const GLenum TEXTURE26                      = 0x84DA;
+    const GLenum TEXTURE27                      = 0x84DB;
+    const GLenum TEXTURE28                      = 0x84DC;
+    const GLenum TEXTURE29                      = 0x84DD;
+    const GLenum TEXTURE30                      = 0x84DE;
+    const GLenum TEXTURE31                      = 0x84DF;
+    const GLenum ACTIVE_TEXTURE                 = 0x84E0;
+
+    /* TextureWrapMode */
+    const GLenum REPEAT                         = 0x2901;
+    const GLenum CLAMP_TO_EDGE                  = 0x812F;
+    const GLenum MIRRORED_REPEAT                = 0x8370;
+
+    /* Uniform Types */
+    const GLenum FLOAT_VEC2                     = 0x8B50;
+    const GLenum FLOAT_VEC3                     = 0x8B51;
+    const GLenum FLOAT_VEC4                     = 0x8B52;
+    const GLenum INT_VEC2                       = 0x8B53;
+    const GLenum INT_VEC3                       = 0x8B54;
+    const GLenum INT_VEC4                       = 0x8B55;
+    const GLenum BOOL                           = 0x8B56;
+    const GLenum BOOL_VEC2                      = 0x8B57;
+    const GLenum BOOL_VEC3                      = 0x8B58;
+    const GLenum BOOL_VEC4                      = 0x8B59;
+    const GLenum FLOAT_MAT2                     = 0x8B5A;
+    const GLenum FLOAT_MAT3                     = 0x8B5B;
+    const GLenum FLOAT_MAT4                     = 0x8B5C;
+    const GLenum SAMPLER_2D                     = 0x8B5E;
+    const GLenum SAMPLER_CUBE                   = 0x8B60;
+
+    /* Vertex Arrays */
+    const GLenum VERTEX_ATTRIB_ARRAY_ENABLED        = 0x8622;
+    const GLenum VERTEX_ATTRIB_ARRAY_SIZE           = 0x8623;
+    const GLenum VERTEX_ATTRIB_ARRAY_STRIDE         = 0x8624;
+    const GLenum VERTEX_ATTRIB_ARRAY_TYPE           = 0x8625;
+    const GLenum VERTEX_ATTRIB_ARRAY_NORMALIZED     = 0x886A;
+    const GLenum VERTEX_ATTRIB_ARRAY_POINTER        = 0x8645;
+    const GLenum VERTEX_ATTRIB_ARRAY_BUFFER_BINDING = 0x889F;
+
+    /* Read Format */
+    const GLenum IMPLEMENTATION_COLOR_READ_TYPE   = 0x8B9A;
+    const GLenum IMPLEMENTATION_COLOR_READ_FORMAT = 0x8B9B;
+
+    /* Shader Source */
+    const GLenum COMPILE_STATUS                 = 0x8B81;
+
+    /* Shader Precision-Specified Types */
+    const GLenum LOW_FLOAT                      = 0x8DF0;
+    const GLenum MEDIUM_FLOAT                   = 0x8DF1;
+    const GLenum HIGH_FLOAT                     = 0x8DF2;
+    const GLenum LOW_INT                        = 0x8DF3;
+    const GLenum MEDIUM_INT                     = 0x8DF4;
+    const GLenum HIGH_INT                       = 0x8DF5;
+
+    /* Framebuffer Object. */
+    const GLenum FRAMEBUFFER                    = 0x8D40;
+    const GLenum RENDERBUFFER                   = 0x8D41;
+
+    const GLenum RGBA4                          = 0x8056;
+    const GLenum RGB5_A1                        = 0x8057;
+    const GLenum RGB565                         = 0x8D62;
+    const GLenum DEPTH_COMPONENT16              = 0x81A5;
+    const GLenum STENCIL_INDEX8                 = 0x8D48;
+    const GLenum DEPTH_STENCIL                  = 0x84F9;
+
+    const GLenum RENDERBUFFER_WIDTH             = 0x8D42;
+    const GLenum RENDERBUFFER_HEIGHT            = 0x8D43;
+    const GLenum RENDERBUFFER_INTERNAL_FORMAT   = 0x8D44;
+    const GLenum RENDERBUFFER_RED_SIZE          = 0x8D50;
+    const GLenum RENDERBUFFER_GREEN_SIZE        = 0x8D51;
+    const GLenum RENDERBUFFER_BLUE_SIZE         = 0x8D52;
+    const GLenum RENDERBUFFER_ALPHA_SIZE        = 0x8D53;
+    const GLenum RENDERBUFFER_DEPTH_SIZE        = 0x8D54;
+    const GLenum RENDERBUFFER_STENCIL_SIZE      = 0x8D55;
+
+    const GLenum FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE           = 0x8CD0;
+    const GLenum FRAMEBUFFER_ATTACHMENT_OBJECT_NAME           = 0x8CD1;
+    const GLenum FRAMEBUFFER_ATTACHMENT_TEXTURE_LEVEL         = 0x8CD2;
+    const GLenum FRAMEBUFFER_ATTACHMENT_TEXTURE_CUBE_MAP_FACE = 0x8CD3;
+
+    const GLenum COLOR_ATTACHMENT0              = 0x8CE0;
+    const GLenum DEPTH_ATTACHMENT               = 0x8D00;
+    const GLenum STENCIL_ATTACHMENT             = 0x8D20;
+    const GLenum DEPTH_STENCIL_ATTACHMENT       = 0x821A;
+
+    const GLenum NONE                           = 0;
+
+    const GLenum FRAMEBUFFER_COMPLETE                      = 0x8CD5;
+    const GLenum FRAMEBUFFER_INCOMPLETE_ATTACHMENT         = 0x8CD6;
+    const GLenum FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT = 0x8CD7;
+    const GLenum FRAMEBUFFER_INCOMPLETE_DIMENSIONS         = 0x8CD9;
+    const GLenum FRAMEBUFFER_UNSUPPORTED                   = 0x8CDD;
+
+    const GLenum FRAMEBUFFER_BINDING            = 0x8CA6;
+    const GLenum RENDERBUFFER_BINDING           = 0x8CA7;
+    const GLenum MAX_RENDERBUFFER_SIZE          = 0x84E8;
+
+    const GLenum INVALID_FRAMEBUFFER_OPERATION  = 0x0506;
+
+    /* WebGL-specific enums */
+    const GLenum UNPACK_FLIP_Y_WEBGL            = 0x9240;
+    const GLenum UNPACK_PREMULTIPLY_ALPHA_WEBGL = 0x9241;
+    const GLenum CONTEXT_LOST_WEBGL             = 0x9242;
+    const GLenum UNPACK_COLORSPACE_CONVERSION_WEBGL = 0x9243;
+    const GLenum BROWSER_DEFAULT_WEBGL          = 0x9244;
+
+    readonly attribute (HTMLCanvasElement or OffscreenCanvas) canvas;
+    readonly attribute GLsizei drawingBufferWidth;
+    readonly attribute GLsizei drawingBufferHeight;
+    attribute PredefinedColorSpace drawingBufferColorSpace;
+    attribute PredefinedColorSpace unpackColorSpace;
+
+    [WebGLHandlesContextLoss] WebGLContextAttributes? getContextAttributes();
+    [WebGLHandlesContextLoss] boolean isContextLost();
+
+    sequence<DOMString>? getSupportedExtensions();
+    object? getExtension(DOMString name);
+
+    undefined activeTexture(GLenum texture);
+    undefined attachShader(WebGLProgram program, WebGLShader shader);
+    undefined bindAttribLocation(WebGLProgram program, GLuint index, DOMString name);
+    undefined bindBuffer(GLenum target, WebGLBuffer? buffer);
+    undefined bindFramebuffer(GLenum target, WebGLFramebuffer? framebuffer);
+    undefined bindRenderbuffer(GLenum target, WebGLRenderbuffer? renderbuffer);
+    undefined bindTexture(GLenum target, WebGLTexture? texture);
+    undefined blendColor(GLclampf red, GLclampf green, GLclampf blue, GLclampf alpha);
+    undefined blendEquation(GLenum mode);
+    undefined blendEquationSeparate(GLenum modeRGB, GLenum modeAlpha);
+    undefined blendFunc(GLenum sfactor, GLenum dfactor);
+    undefined blendFuncSeparate(GLenum srcRGB, GLenum dstRGB,
+                                GLenum srcAlpha, GLenum dstAlpha);
+
+    [WebGLHandlesContextLoss] GLenum checkFramebufferStatus(GLenum target);
+    undefined clear(GLbitfield mask);
+    undefined clearColor(GLclampf red, GLclampf green, GLclampf blue, GLclampf alpha);
+    undefined clearDepth(GLclampf depth);
+    undefined clearStencil(GLint s);
+    undefined colorMask(GLboolean red, GLboolean green, GLboolean blue, GLboolean alpha);
+    undefined compileShader(WebGLShader shader);
+
+    undefined copyTexImage2D(GLenum target, GLint level, GLenum internalformat,
+                             GLint x, GLint y, GLsizei width, GLsizei height,
+                             GLint border);
+    undefined copyTexSubImage2D(GLenum target, GLint level, GLint xoffset, GLint yoffset,
+                                GLint x, GLint y, GLsizei width, GLsizei height);
+
+    WebGLBuffer? createBuffer();
+    WebGLFramebuffer? createFramebuffer();
+    WebGLProgram? createProgram();
+    WebGLRenderbuffer? createRenderbuffer();
+    WebGLShader? createShader(GLenum type);
+    WebGLTexture? createTexture();
+
+    undefined cullFace(GLenum mode);
+
+    undefined deleteBuffer(WebGLBuffer? buffer);
+    undefined deleteFramebuffer(WebGLFramebuffer? framebuffer);
+    undefined deleteProgram(WebGLProgram? program);
+    undefined deleteRenderbuffer(WebGLRenderbuffer? renderbuffer);
+    undefined deleteShader(WebGLShader? shader);
+    undefined deleteTexture(WebGLTexture? texture);
+
+    undefined depthFunc(GLenum func);
+    undefined depthMask(GLboolean flag);
+    undefined depthRange(GLclampf zNear, GLclampf zFar);
+    undefined detachShader(WebGLProgram program, WebGLShader shader);
+    undefined disable(GLenum cap);
+    undefined disableVertexAttribArray(GLuint index);
+    undefined drawArrays(GLenum mode, GLint first, GLsizei count);
+    undefined drawElements(GLenum mode, GLsizei count, GLenum type, GLintptr offset);
+
+    undefined enable(GLenum cap);
+    undefined enableVertexAttribArray(GLuint index);
+    undefined finish();
+    undefined flush();
+    undefined framebufferRenderbuffer(GLenum target, GLenum attachment,
+                                      GLenum renderbuffertarget,
+                                      WebGLRenderbuffer? renderbuffer);
+    undefined framebufferTexture2D(GLenum target, GLenum attachment, GLenum textarget,
+                                   WebGLTexture? texture, GLint level);
+    undefined frontFace(GLenum mode);
+
+    undefined generateMipmap(GLenum target);
+
+    WebGLActiveInfo? getActiveAttrib(WebGLProgram program, GLuint index);
+    WebGLActiveInfo? getActiveUniform(WebGLProgram program, GLuint index);
+    sequence<WebGLShader>? getAttachedShaders(WebGLProgram program);
+
+    [WebGLHandlesContextLoss] GLint getAttribLocation(WebGLProgram program, DOMString name);
+
+    any getBufferParameter(GLenum target, GLenum pname);
+    any getParameter(GLenum pname);
+
+    [WebGLHandlesContextLoss] GLenum getError();
+
+    any getFramebufferAttachmentParameter(GLenum target, GLenum attachment,
+                                          GLenum pname);
+    any getProgramParameter(WebGLProgram program, GLenum pname);
+    DOMString? getProgramInfoLog(WebGLProgram program);
+    any getRenderbufferParameter(GLenum target, GLenum pname);
+    any getShaderParameter(WebGLShader shader, GLenum pname);
+    WebGLShaderPrecisionFormat? getShaderPrecisionFormat(GLenum shadertype, GLenum precisiontype);
+    DOMString? getShaderInfoLog(WebGLShader shader);
+
+    DOMString? getShaderSource(WebGLShader shader);
+
+    any getTexParameter(GLenum target, GLenum pname);
+
+    any getUniform(WebGLProgram program, WebGLUniformLocation location);
+
+    WebGLUniformLocation? getUniformLocation(WebGLProgram program, DOMString name);
+
+    any getVertexAttrib(GLuint index, GLenum pname);
+
+    [WebGLHandlesContextLoss] GLintptr getVertexAttribOffset(GLuint index, GLenum pname);
+
+    undefined hint(GLenum target, GLenum mode);
+    [WebGLHandlesContextLoss] GLboolean isBuffer(WebGLBuffer? buffer);
+    [WebGLHandlesContextLoss] GLboolean isEnabled(GLenum cap);
+    [WebGLHandlesContextLoss] GLboolean isFramebuffer(WebGLFramebuffer? framebuffer);
+    [WebGLHandlesContextLoss] GLboolean isProgram(WebGLProgram? program);
+    [WebGLHandlesContextLoss] GLboolean isRenderbuffer(WebGLRenderbuffer? renderbuffer);
+    [WebGLHandlesContextLoss] GLboolean isShader(WebGLShader? shader);
+    [WebGLHandlesContextLoss] GLboolean isTexture(WebGLTexture? texture);
+    undefined lineWidth(GLfloat width);
+    undefined linkProgram(WebGLProgram program);
+    undefined pixelStorei(GLenum pname, GLint param);
+    undefined polygonOffset(GLfloat factor, GLfloat units);
+
+    undefined renderbufferStorage(GLenum target, GLenum internalformat,
+                                  GLsizei width, GLsizei height);
+    undefined sampleCoverage(GLclampf value, GLboolean invert);
+    undefined scissor(GLint x, GLint y, GLsizei width, GLsizei height);
+
+    undefined shaderSource(WebGLShader shader, DOMString source);
+
+    undefined stencilFunc(GLenum func, GLint ref, GLuint mask);
+    undefined stencilFuncSeparate(GLenum face, GLenum func, GLint ref, GLuint mask);
+    undefined stencilMask(GLuint mask);
+    undefined stencilMaskSeparate(GLenum face, GLuint mask);
+    undefined stencilOp(GLenum fail, GLenum zfail, GLenum zpass);
+    undefined stencilOpSeparate(GLenum face, GLenum fail, GLenum zfail, GLenum zpass);
+
+    undefined texParameterf(GLenum target, GLenum pname, GLfloat param);
+    undefined texParameteri(GLenum target, GLenum pname, GLint param);
+
+    undefined uniform1f(WebGLUniformLocation? location, GLfloat x);
+    undefined uniform2f(WebGLUniformLocation? location, GLfloat x, GLfloat y);
+    undefined uniform3f(WebGLUniformLocation? location, GLfloat x, GLfloat y, GLfloat z);
+    undefined uniform4f(WebGLUniformLocation? location, GLfloat x, GLfloat y, GLfloat z, GLfloat w);
+
+    undefined uniform1i(WebGLUniformLocation? location, GLint x);
+    undefined uniform2i(WebGLUniformLocation? location, GLint x, GLint y);
+    undefined uniform3i(WebGLUniformLocation? location, GLint x, GLint y, GLint z);
+    undefined uniform4i(WebGLUniformLocation? location, GLint x, GLint y, GLint z, GLint w);
+
+    undefined useProgram(WebGLProgram? program);
+    undefined validateProgram(WebGLProgram program);
+
+    undefined vertexAttrib1f(GLuint index, GLfloat x);
+    undefined vertexAttrib2f(GLuint index, GLfloat x, GLfloat y);
+    undefined vertexAttrib3f(GLuint index, GLfloat x, GLfloat y, GLfloat z);
+    undefined vertexAttrib4f(GLuint index, GLfloat x, GLfloat y, GLfloat z, GLfloat w);
+
+    undefined vertexAttrib1fv(GLuint index, Float32List values);
+    undefined vertexAttrib2fv(GLuint index, Float32List values);
+    undefined vertexAttrib3fv(GLuint index, Float32List values);
+    undefined vertexAttrib4fv(GLuint index, Float32List values);
+
+    undefined vertexAttribPointer(GLuint index, GLint size, GLenum type,
+                                  GLboolean normalized, GLsizei stride, GLintptr offset);
+
+    undefined viewport(GLint x, GLint y, GLsizei width, GLsizei height);
+};
+
+interface mixin WebGLRenderingContextOverloads
+{
+    undefined bufferData(GLenum target, GLsizeiptr size, GLenum usage);
+    undefined bufferData(GLenum target, [AllowShared] BufferSource? data, GLenum usage);
+    undefined bufferSubData(GLenum target, GLintptr offset, [AllowShared] BufferSource data);
+
+    undefined compressedTexImage2D(GLenum target, GLint level, GLenum internalformat,
+                                   GLsizei width, GLsizei height, GLint border,
+                                   [AllowShared] ArrayBufferView data);
+    undefined compressedTexSubImage2D(GLenum target, GLint level,
+                                      GLint xoffset, GLint yoffset,
+                                      GLsizei width, GLsizei height, GLenum format,
+                                      [AllowShared] ArrayBufferView data);
+
+    undefined readPixels(GLint x, GLint y, GLsizei width, GLsizei height,
+                         GLenum format, GLenum type, [AllowShared] ArrayBufferView? pixels);
+
+    undefined texImage2D(GLenum target, GLint level, GLint internalformat,
+                         GLsizei width, GLsizei height, GLint border, GLenum format,
+                         GLenum type, [AllowShared] ArrayBufferView? pixels);
+    undefined texImage2D(GLenum target, GLint level, GLint internalformat,
+                         GLenum format, GLenum type, TexImageSource source); // May throw DOMException
+
+    undefined texSubImage2D(GLenum target, GLint level, GLint xoffset, GLint yoffset,
+                            GLsizei width, GLsizei height,
+                            GLenum format, GLenum type, [AllowShared] ArrayBufferView? pixels);
+    undefined texSubImage2D(GLenum target, GLint level, GLint xoffset, GLint yoffset,
+                            GLenum format, GLenum type, TexImageSource source); // May throw DOMException
+
+    undefined uniform1fv(WebGLUniformLocation? location, Float32List v);
+    undefined uniform2fv(WebGLUniformLocation? location, Float32List v);
+    undefined uniform3fv(WebGLUniformLocation? location, Float32List v);
+    undefined uniform4fv(WebGLUniformLocation? location, Float32List v);
+
+    undefined uniform1iv(WebGLUniformLocation? location, Int32List v);
+    undefined uniform2iv(WebGLUniformLocation? location, Int32List v);
+    undefined uniform3iv(WebGLUniformLocation? location, Int32List v);
+    undefined uniform4iv(WebGLUniformLocation? location, Int32List v);
+
+    undefined uniformMatrix2fv(WebGLUniformLocation? location, GLboolean transpose, Float32List value);
+    undefined uniformMatrix3fv(WebGLUniformLocation? location, GLboolean transpose, Float32List value);
+    undefined uniformMatrix4fv(WebGLUniformLocation? location, GLboolean transpose, Float32List value);
+};
+
+[Exposed=(Window,Worker)]
+interface WebGLRenderingContext
+{
+};
+WebGLRenderingContext includes WebGLRenderingContextBase;
+WebGLRenderingContext includes WebGLRenderingContextOverloads;
+
+[Exposed=(Window,Worker)]
+interface WebGLContextEvent : Event {
+    constructor(DOMString type, optional WebGLContextEventInit eventInit = {});
+    readonly attribute DOMString statusMessage;
+};
+
+// EventInit is defined in the DOM4 specification.
+dictionary WebGLContextEventInit : EventInit {
+    DOMString statusMessage = "";
+};
diff --git a/test/wpt/tests/interfaces/webgl2.idl b/test/wpt/tests/interfaces/webgl2.idl
new file mode 100644
index 00000000000..22e2d6fa324
--- /dev/null
+++ b/test/wpt/tests/interfaces/webgl2.idl
@@ -0,0 +1,582 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: WebGL 2.0 Specification (https://registry.khronos.org/webgl/specs/latest/2.0/)
+
+typedef long long GLint64;
+typedef unsigned long long GLuint64;
+
+[Exposed=(Window,Worker)]
+interface WebGLQuery : WebGLObject {
+};
+
+[Exposed=(Window,Worker)]
+interface WebGLSampler : WebGLObject {
+};
+
+[Exposed=(Window,Worker)]
+interface WebGLSync : WebGLObject {
+};
+
+[Exposed=(Window,Worker)]
+interface WebGLTransformFeedback : WebGLObject {
+};
+
+[Exposed=(Window,Worker)]
+interface WebGLVertexArrayObject : WebGLObject {
+};
+
+typedef ([AllowShared] Uint32Array or sequence<GLuint>) Uint32List;
+
+interface mixin WebGL2RenderingContextBase
+{
+  const GLenum READ_BUFFER                                   = 0x0C02;
+  const GLenum UNPACK_ROW_LENGTH                             = 0x0CF2;
+  const GLenum UNPACK_SKIP_ROWS                              = 0x0CF3;
+  const GLenum UNPACK_SKIP_PIXELS                            = 0x0CF4;
+  const GLenum PACK_ROW_LENGTH                               = 0x0D02;
+  const GLenum PACK_SKIP_ROWS                                = 0x0D03;
+  const GLenum PACK_SKIP_PIXELS                              = 0x0D04;
+  const GLenum COLOR                                         = 0x1800;
+  const GLenum DEPTH                                         = 0x1801;
+  const GLenum STENCIL                                       = 0x1802;
+  const GLenum RED                                           = 0x1903;
+  const GLenum RGB8                                          = 0x8051;
+  const GLenum RGBA8                                         = 0x8058;
+  const GLenum RGB10_A2                                      = 0x8059;
+  const GLenum TEXTURE_BINDING_3D                            = 0x806A;
+  const GLenum UNPACK_SKIP_IMAGES                            = 0x806D;
+  const GLenum UNPACK_IMAGE_HEIGHT                           = 0x806E;
+  const GLenum TEXTURE_3D                                    = 0x806F;
+  const GLenum TEXTURE_WRAP_R                                = 0x8072;
+  const GLenum MAX_3D_TEXTURE_SIZE                           = 0x8073;
+  const GLenum UNSIGNED_INT_2_10_10_10_REV                   = 0x8368;
+  const GLenum MAX_ELEMENTS_VERTICES                         = 0x80E8;
+  const GLenum MAX_ELEMENTS_INDICES                          = 0x80E9;
+  const GLenum TEXTURE_MIN_LOD                               = 0x813A;
+  const GLenum TEXTURE_MAX_LOD                               = 0x813B;
+  const GLenum TEXTURE_BASE_LEVEL                            = 0x813C;
+  const GLenum TEXTURE_MAX_LEVEL                             = 0x813D;
+  const GLenum MIN                                           = 0x8007;
+  const GLenum MAX                                           = 0x8008;
+  const GLenum DEPTH_COMPONENT24                             = 0x81A6;
+  const GLenum MAX_TEXTURE_LOD_BIAS                          = 0x84FD;
+  const GLenum TEXTURE_COMPARE_MODE                          = 0x884C;
+  const GLenum TEXTURE_COMPARE_FUNC                          = 0x884D;
+  const GLenum CURRENT_QUERY                                 = 0x8865;
+  const GLenum QUERY_RESULT                                  = 0x8866;
+  const GLenum QUERY_RESULT_AVAILABLE                        = 0x8867;
+  const GLenum STREAM_READ                                   = 0x88E1;
+  const GLenum STREAM_COPY                                   = 0x88E2;
+  const GLenum STATIC_READ                                   = 0x88E5;
+  const GLenum STATIC_COPY                                   = 0x88E6;
+  const GLenum DYNAMIC_READ                                  = 0x88E9;
+  const GLenum DYNAMIC_COPY                                  = 0x88EA;
+  const GLenum MAX_DRAW_BUFFERS                              = 0x8824;
+  const GLenum DRAW_BUFFER0                                  = 0x8825;
+  const GLenum DRAW_BUFFER1                                  = 0x8826;
+  const GLenum DRAW_BUFFER2                                  = 0x8827;
+  const GLenum DRAW_BUFFER3                                  = 0x8828;
+  const GLenum DRAW_BUFFER4                                  = 0x8829;
+  const GLenum DRAW_BUFFER5                                  = 0x882A;
+  const GLenum DRAW_BUFFER6                                  = 0x882B;
+  const GLenum DRAW_BUFFER7                                  = 0x882C;
+  const GLenum DRAW_BUFFER8                                  = 0x882D;
+  const GLenum DRAW_BUFFER9                                  = 0x882E;
+  const GLenum DRAW_BUFFER10                                 = 0x882F;
+  const GLenum DRAW_BUFFER11                                 = 0x8830;
+  const GLenum DRAW_BUFFER12                                 = 0x8831;
+  const GLenum DRAW_BUFFER13                                 = 0x8832;
+  const GLenum DRAW_BUFFER14                                 = 0x8833;
+  const GLenum DRAW_BUFFER15                                 = 0x8834;
+  const GLenum MAX_FRAGMENT_UNIFORM_COMPONENTS               = 0x8B49;
+  const GLenum MAX_VERTEX_UNIFORM_COMPONENTS                 = 0x8B4A;
+  const GLenum SAMPLER_3D                                    = 0x8B5F;
+  const GLenum SAMPLER_2D_SHADOW                             = 0x8B62;
+  const GLenum FRAGMENT_SHADER_DERIVATIVE_HINT               = 0x8B8B;
+  const GLenum PIXEL_PACK_BUFFER                             = 0x88EB;
+  const GLenum PIXEL_UNPACK_BUFFER                           = 0x88EC;
+  const GLenum PIXEL_PACK_BUFFER_BINDING                     = 0x88ED;
+  const GLenum PIXEL_UNPACK_BUFFER_BINDING                   = 0x88EF;
+  const GLenum FLOAT_MAT2x3                                  = 0x8B65;
+  const GLenum FLOAT_MAT2x4                                  = 0x8B66;
+  const GLenum FLOAT_MAT3x2                                  = 0x8B67;
+  const GLenum FLOAT_MAT3x4                                  = 0x8B68;
+  const GLenum FLOAT_MAT4x2                                  = 0x8B69;
+  const GLenum FLOAT_MAT4x3                                  = 0x8B6A;
+  const GLenum SRGB                                          = 0x8C40;
+  const GLenum SRGB8                                         = 0x8C41;
+  const GLenum SRGB8_ALPHA8                                  = 0x8C43;
+  const GLenum COMPARE_REF_TO_TEXTURE                        = 0x884E;
+  const GLenum RGBA32F                                       = 0x8814;
+  const GLenum RGB32F                                        = 0x8815;
+  const GLenum RGBA16F                                       = 0x881A;
+  const GLenum RGB16F                                        = 0x881B;
+  const GLenum VERTEX_ATTRIB_ARRAY_INTEGER                   = 0x88FD;
+  const GLenum MAX_ARRAY_TEXTURE_LAYERS                      = 0x88FF;
+  const GLenum MIN_PROGRAM_TEXEL_OFFSET                      = 0x8904;
+  const GLenum MAX_PROGRAM_TEXEL_OFFSET                      = 0x8905;
+  const GLenum MAX_VARYING_COMPONENTS                        = 0x8B4B;
+  const GLenum TEXTURE_2D_ARRAY                              = 0x8C1A;
+  const GLenum TEXTURE_BINDING_2D_ARRAY                      = 0x8C1D;
+  const GLenum R11F_G11F_B10F                                = 0x8C3A;
+  const GLenum UNSIGNED_INT_10F_11F_11F_REV                  = 0x8C3B;
+  const GLenum RGB9_E5                                       = 0x8C3D;
+  const GLenum UNSIGNED_INT_5_9_9_9_REV                      = 0x8C3E;
+  const GLenum TRANSFORM_FEEDBACK_BUFFER_MODE                = 0x8C7F;
+  const GLenum MAX_TRANSFORM_FEEDBACK_SEPARATE_COMPONENTS    = 0x8C80;
+  const GLenum TRANSFORM_FEEDBACK_VARYINGS                   = 0x8C83;
+  const GLenum TRANSFORM_FEEDBACK_BUFFER_START               = 0x8C84;
+  const GLenum TRANSFORM_FEEDBACK_BUFFER_SIZE                = 0x8C85;
+  const GLenum TRANSFORM_FEEDBACK_PRIMITIVES_WRITTEN         = 0x8C88;
+  const GLenum RASTERIZER_DISCARD                            = 0x8C89;
+  const GLenum MAX_TRANSFORM_FEEDBACK_INTERLEAVED_COMPONENTS = 0x8C8A;
+  const GLenum MAX_TRANSFORM_FEEDBACK_SEPARATE_ATTRIBS       = 0x8C8B;
+  const GLenum INTERLEAVED_ATTRIBS                           = 0x8C8C;
+  const GLenum SEPARATE_ATTRIBS                              = 0x8C8D;
+  const GLenum TRANSFORM_FEEDBACK_BUFFER                     = 0x8C8E;
+  const GLenum TRANSFORM_FEEDBACK_BUFFER_BINDING             = 0x8C8F;
+  const GLenum RGBA32UI                                      = 0x8D70;
+  const GLenum RGB32UI                                       = 0x8D71;
+  const GLenum RGBA16UI                                      = 0x8D76;
+  const GLenum RGB16UI                                       = 0x8D77;
+  const GLenum RGBA8UI                                       = 0x8D7C;
+  const GLenum RGB8UI                                        = 0x8D7D;
+  const GLenum RGBA32I                                       = 0x8D82;
+  const GLenum RGB32I                                        = 0x8D83;
+  const GLenum RGBA16I                                       = 0x8D88;
+  const GLenum RGB16I                                        = 0x8D89;
+  const GLenum RGBA8I                                        = 0x8D8E;
+  const GLenum RGB8I                                         = 0x8D8F;
+  const GLenum RED_INTEGER                                   = 0x8D94;
+  const GLenum RGB_INTEGER                                   = 0x8D98;
+  const GLenum RGBA_INTEGER                                  = 0x8D99;
+  const GLenum SAMPLER_2D_ARRAY                              = 0x8DC1;
+  const GLenum SAMPLER_2D_ARRAY_SHADOW                       = 0x8DC4;
+  const GLenum SAMPLER_CUBE_SHADOW                           = 0x8DC5;
+  const GLenum UNSIGNED_INT_VEC2                             = 0x8DC6;
+  const GLenum UNSIGNED_INT_VEC3                             = 0x8DC7;
+  const GLenum UNSIGNED_INT_VEC4                             = 0x8DC8;
+  const GLenum INT_SAMPLER_2D                                = 0x8DCA;
+  const GLenum INT_SAMPLER_3D                                = 0x8DCB;
+  const GLenum INT_SAMPLER_CUBE                              = 0x8DCC;
+  const GLenum INT_SAMPLER_2D_ARRAY                          = 0x8DCF;
+  const GLenum UNSIGNED_INT_SAMPLER_2D                       = 0x8DD2;
+  const GLenum UNSIGNED_INT_SAMPLER_3D                       = 0x8DD3;
+  const GLenum UNSIGNED_INT_SAMPLER_CUBE                     = 0x8DD4;
+  const GLenum UNSIGNED_INT_SAMPLER_2D_ARRAY                 = 0x8DD7;
+  const GLenum DEPTH_COMPONENT32F                            = 0x8CAC;
+  const GLenum DEPTH32F_STENCIL8                             = 0x8CAD;
+  const GLenum FLOAT_32_UNSIGNED_INT_24_8_REV                = 0x8DAD;
+  const GLenum FRAMEBUFFER_ATTACHMENT_COLOR_ENCODING         = 0x8210;
+  const GLenum FRAMEBUFFER_ATTACHMENT_COMPONENT_TYPE         = 0x8211;
+  const GLenum FRAMEBUFFER_ATTACHMENT_RED_SIZE               = 0x8212;
+  const GLenum FRAMEBUFFER_ATTACHMENT_GREEN_SIZE             = 0x8213;
+  const GLenum FRAMEBUFFER_ATTACHMENT_BLUE_SIZE              = 0x8214;
+  const GLenum FRAMEBUFFER_ATTACHMENT_ALPHA_SIZE             = 0x8215;
+  const GLenum FRAMEBUFFER_ATTACHMENT_DEPTH_SIZE             = 0x8216;
+  const GLenum FRAMEBUFFER_ATTACHMENT_STENCIL_SIZE           = 0x8217;
+  const GLenum FRAMEBUFFER_DEFAULT                           = 0x8218;
+  const GLenum UNSIGNED_INT_24_8                             = 0x84FA;
+  const GLenum DEPTH24_STENCIL8                              = 0x88F0;
+  const GLenum UNSIGNED_NORMALIZED                           = 0x8C17;
+  const GLenum DRAW_FRAMEBUFFER_BINDING                      = 0x8CA6; /* Same as FRAMEBUFFER_BINDING */
+  const GLenum READ_FRAMEBUFFER                              = 0x8CA8;
+  const GLenum DRAW_FRAMEBUFFER                              = 0x8CA9;
+  const GLenum READ_FRAMEBUFFER_BINDING                      = 0x8CAA;
+  const GLenum RENDERBUFFER_SAMPLES                          = 0x8CAB;
+  const GLenum FRAMEBUFFER_ATTACHMENT_TEXTURE_LAYER          = 0x8CD4;
+  const GLenum MAX_COLOR_ATTACHMENTS                         = 0x8CDF;
+  const GLenum COLOR_ATTACHMENT1                             = 0x8CE1;
+  const GLenum COLOR_ATTACHMENT2                             = 0x8CE2;
+  const GLenum COLOR_ATTACHMENT3                             = 0x8CE3;
+  const GLenum COLOR_ATTACHMENT4                             = 0x8CE4;
+  const GLenum COLOR_ATTACHMENT5                             = 0x8CE5;
+  const GLenum COLOR_ATTACHMENT6                             = 0x8CE6;
+  const GLenum COLOR_ATTACHMENT7                             = 0x8CE7;
+  const GLenum COLOR_ATTACHMENT8                             = 0x8CE8;
+  const GLenum COLOR_ATTACHMENT9                             = 0x8CE9;
+  const GLenum COLOR_ATTACHMENT10                            = 0x8CEA;
+  const GLenum COLOR_ATTACHMENT11                            = 0x8CEB;
+  const GLenum COLOR_ATTACHMENT12                            = 0x8CEC;
+  const GLenum COLOR_ATTACHMENT13                            = 0x8CED;
+  const GLenum COLOR_ATTACHMENT14                            = 0x8CEE;
+  const GLenum COLOR_ATTACHMENT15                            = 0x8CEF;
+  const GLenum FRAMEBUFFER_INCOMPLETE_MULTISAMPLE            = 0x8D56;
+  const GLenum MAX_SAMPLES                                   = 0x8D57;
+  const GLenum HALF_FLOAT                                    = 0x140B;
+  const GLenum RG                                            = 0x8227;
+  const GLenum RG_INTEGER                                    = 0x8228;
+  const GLenum R8                                            = 0x8229;
+  const GLenum RG8                                           = 0x822B;
+  const GLenum R16F                                          = 0x822D;
+  const GLenum R32F                                          = 0x822E;
+  const GLenum RG16F                                         = 0x822F;
+  const GLenum RG32F                                         = 0x8230;
+  const GLenum R8I                                           = 0x8231;
+  const GLenum R8UI                                          = 0x8232;
+  const GLenum R16I                                          = 0x8233;
+  const GLenum R16UI                                         = 0x8234;
+  const GLenum R32I                                          = 0x8235;
+  const GLenum R32UI                                         = 0x8236;
+  const GLenum RG8I                                          = 0x8237;
+  const GLenum RG8UI                                         = 0x8238;
+  const GLenum RG16I                                         = 0x8239;
+  const GLenum RG16UI                                        = 0x823A;
+  const GLenum RG32I                                         = 0x823B;
+  const GLenum RG32UI                                        = 0x823C;
+  const GLenum VERTEX_ARRAY_BINDING                          = 0x85B5;
+  const GLenum R8_SNORM                                      = 0x8F94;
+  const GLenum RG8_SNORM                                     = 0x8F95;
+  const GLenum RGB8_SNORM                                    = 0x8F96;
+  const GLenum RGBA8_SNORM                                   = 0x8F97;
+  const GLenum SIGNED_NORMALIZED                             = 0x8F9C;
+  const GLenum COPY_READ_BUFFER                              = 0x8F36;
+  const GLenum COPY_WRITE_BUFFER                             = 0x8F37;
+  const GLenum COPY_READ_BUFFER_BINDING                      = 0x8F36; /* Same as COPY_READ_BUFFER */
+  const GLenum COPY_WRITE_BUFFER_BINDING                     = 0x8F37; /* Same as COPY_WRITE_BUFFER */
+  const GLenum UNIFORM_BUFFER                                = 0x8A11;
+  const GLenum UNIFORM_BUFFER_BINDING                        = 0x8A28;
+  const GLenum UNIFORM_BUFFER_START                          = 0x8A29;
+  const GLenum UNIFORM_BUFFER_SIZE                           = 0x8A2A;
+  const GLenum MAX_VERTEX_UNIFORM_BLOCKS                     = 0x8A2B;
+  const GLenum MAX_FRAGMENT_UNIFORM_BLOCKS                   = 0x8A2D;
+  const GLenum MAX_COMBINED_UNIFORM_BLOCKS                   = 0x8A2E;
+  const GLenum MAX_UNIFORM_BUFFER_BINDINGS                   = 0x8A2F;
+  const GLenum MAX_UNIFORM_BLOCK_SIZE                        = 0x8A30;
+  const GLenum MAX_COMBINED_VERTEX_UNIFORM_COMPONENTS        = 0x8A31;
+  const GLenum MAX_COMBINED_FRAGMENT_UNIFORM_COMPONENTS      = 0x8A33;
+  const GLenum UNIFORM_BUFFER_OFFSET_ALIGNMENT               = 0x8A34;
+  const GLenum ACTIVE_UNIFORM_BLOCKS                         = 0x8A36;
+  const GLenum UNIFORM_TYPE                                  = 0x8A37;
+  const GLenum UNIFORM_SIZE                                  = 0x8A38;
+  const GLenum UNIFORM_BLOCK_INDEX                           = 0x8A3A;
+  const GLenum UNIFORM_OFFSET                                = 0x8A3B;
+  const GLenum UNIFORM_ARRAY_STRIDE                          = 0x8A3C;
+  const GLenum UNIFORM_MATRIX_STRIDE                         = 0x8A3D;
+  const GLenum UNIFORM_IS_ROW_MAJOR                          = 0x8A3E;
+  const GLenum UNIFORM_BLOCK_BINDING                         = 0x8A3F;
+  const GLenum UNIFORM_BLOCK_DATA_SIZE                       = 0x8A40;
+  const GLenum UNIFORM_BLOCK_ACTIVE_UNIFORMS                 = 0x8A42;
+  const GLenum UNIFORM_BLOCK_ACTIVE_UNIFORM_INDICES          = 0x8A43;
+  const GLenum UNIFORM_BLOCK_REFERENCED_BY_VERTEX_SHADER     = 0x8A44;
+  const GLenum UNIFORM_BLOCK_REFERENCED_BY_FRAGMENT_SHADER   = 0x8A46;
+  const GLenum INVALID_INDEX                                 = 0xFFFFFFFF;
+  const GLenum MAX_VERTEX_OUTPUT_COMPONENTS                  = 0x9122;
+  const GLenum MAX_FRAGMENT_INPUT_COMPONENTS                 = 0x9125;
+  const GLenum MAX_SERVER_WAIT_TIMEOUT                       = 0x9111;
+  const GLenum OBJECT_TYPE                                   = 0x9112;
+  const GLenum SYNC_CONDITION                                = 0x9113;
+  const GLenum SYNC_STATUS                                   = 0x9114;
+  const GLenum SYNC_FLAGS                                    = 0x9115;
+  const GLenum SYNC_FENCE                                    = 0x9116;
+  const GLenum SYNC_GPU_COMMANDS_COMPLETE                    = 0x9117;
+  const GLenum UNSIGNALED                                    = 0x9118;
+  const GLenum SIGNALED                                      = 0x9119;
+  const GLenum ALREADY_SIGNALED                              = 0x911A;
+  const GLenum TIMEOUT_EXPIRED                               = 0x911B;
+  const GLenum CONDITION_SATISFIED                           = 0x911C;
+  const GLenum WAIT_FAILED                                   = 0x911D;
+  const GLenum SYNC_FLUSH_COMMANDS_BIT                       = 0x00000001;
+  const GLenum VERTEX_ATTRIB_ARRAY_DIVISOR                   = 0x88FE;
+  const GLenum ANY_SAMPLES_PASSED                            = 0x8C2F;
+  const GLenum ANY_SAMPLES_PASSED_CONSERVATIVE               = 0x8D6A;
+  const GLenum SAMPLER_BINDING                               = 0x8919;
+  const GLenum RGB10_A2UI                                    = 0x906F;
+  const GLenum INT_2_10_10_10_REV                            = 0x8D9F;
+  const GLenum TRANSFORM_FEEDBACK                            = 0x8E22;
+  const GLenum TRANSFORM_FEEDBACK_PAUSED                     = 0x8E23;
+  const GLenum TRANSFORM_FEEDBACK_ACTIVE                     = 0x8E24;
+  const GLenum TRANSFORM_FEEDBACK_BINDING                    = 0x8E25;
+  const GLenum TEXTURE_IMMUTABLE_FORMAT                      = 0x912F;
+  const GLenum MAX_ELEMENT_INDEX                             = 0x8D6B;
+  const GLenum TEXTURE_IMMUTABLE_LEVELS                      = 0x82DF;
+
+  const GLint64 TIMEOUT_IGNORED                              = -1;
+
+  /* WebGL-specific enums */
+  const GLenum MAX_CLIENT_WAIT_TIMEOUT_WEBGL                 = 0x9247;
+
+  /* Buffer objects */
+  undefined copyBufferSubData(GLenum readTarget, GLenum writeTarget, GLintptr readOffset,
+                              GLintptr writeOffset, GLsizeiptr size);
+  // MapBufferRange, in particular its read-only and write-only modes,
+  // can not be exposed safely to JavaScript. GetBufferSubData
+  // replaces it for the purpose of fetching data back from the GPU.
+  undefined getBufferSubData(GLenum target, GLintptr srcByteOffset, [AllowShared] ArrayBufferView dstBuffer,
+                             optional GLuint dstOffset = 0, optional GLuint length = 0);
+
+  /* Framebuffer objects */
+  undefined blitFramebuffer(GLint srcX0, GLint srcY0, GLint srcX1, GLint srcY1, GLint dstX0, GLint dstY0,
+                            GLint dstX1, GLint dstY1, GLbitfield mask, GLenum filter);
+  undefined framebufferTextureLayer(GLenum target, GLenum attachment, WebGLTexture? texture, GLint level,
+                                    GLint layer);
+  undefined invalidateFramebuffer(GLenum target, sequence<GLenum> attachments);
+  undefined invalidateSubFramebuffer(GLenum target, sequence<GLenum> attachments,
+                                     GLint x, GLint y, GLsizei width, GLsizei height);
+  undefined readBuffer(GLenum src);
+
+  /* Renderbuffer objects */
+  any getInternalformatParameter(GLenum target, GLenum internalformat, GLenum pname);
+  undefined renderbufferStorageMultisample(GLenum target, GLsizei samples, GLenum internalformat,
+                                           GLsizei width, GLsizei height);
+
+  /* Texture objects */
+  undefined texStorage2D(GLenum target, GLsizei levels, GLenum internalformat, GLsizei width,
+                         GLsizei height);
+  undefined texStorage3D(GLenum target, GLsizei levels, GLenum internalformat, GLsizei width,
+                         GLsizei height, GLsizei depth);
+
+  undefined texImage3D(GLenum target, GLint level, GLint internalformat, GLsizei width, GLsizei height,
+                       GLsizei depth, GLint border, GLenum format, GLenum type, GLintptr pboOffset);
+  undefined texImage3D(GLenum target, GLint level, GLint internalformat, GLsizei width, GLsizei height,
+                       GLsizei depth, GLint border, GLenum format, GLenum type,
+                       TexImageSource source); // May throw DOMException
+  undefined texImage3D(GLenum target, GLint level, GLint internalformat, GLsizei width, GLsizei height,
+                       GLsizei depth, GLint border, GLenum format, GLenum type, [AllowShared] ArrayBufferView? srcData);
+  undefined texImage3D(GLenum target, GLint level, GLint internalformat, GLsizei width, GLsizei height,
+                       GLsizei depth, GLint border, GLenum format, GLenum type, [AllowShared] ArrayBufferView srcData,
+                       GLuint srcOffset);
+
+  undefined texSubImage3D(GLenum target, GLint level, GLint xoffset, GLint yoffset, GLint zoffset,
+                          GLsizei width, GLsizei height, GLsizei depth, GLenum format, GLenum type,
+                          GLintptr pboOffset);
+  undefined texSubImage3D(GLenum target, GLint level, GLint xoffset, GLint yoffset, GLint zoffset,
+                          GLsizei width, GLsizei height, GLsizei depth, GLenum format, GLenum type,
+                          TexImageSource source); // May throw DOMException
+  undefined texSubImage3D(GLenum target, GLint level, GLint xoffset, GLint yoffset, GLint zoffset,
+                          GLsizei width, GLsizei height, GLsizei depth, GLenum format, GLenum type,
+                          [AllowShared] ArrayBufferView? srcData, optional GLuint srcOffset = 0);
+
+  undefined copyTexSubImage3D(GLenum target, GLint level, GLint xoffset, GLint yoffset, GLint zoffset,
+                              GLint x, GLint y, GLsizei width, GLsizei height);
+
+  undefined compressedTexImage3D(GLenum target, GLint level, GLenum internalformat, GLsizei width,
+                                 GLsizei height, GLsizei depth, GLint border, GLsizei imageSize, GLintptr offset);
+  undefined compressedTexImage3D(GLenum target, GLint level, GLenum internalformat, GLsizei width,
+                                 GLsizei height, GLsizei depth, GLint border, [AllowShared] ArrayBufferView srcData,
+                                 optional GLuint srcOffset = 0, optional GLuint srcLengthOverride = 0);
+
+  undefined compressedTexSubImage3D(GLenum target, GLint level, GLint xoffset, GLint yoffset,
+                                    GLint zoffset, GLsizei width, GLsizei height, GLsizei depth,
+                                    GLenum format, GLsizei imageSize, GLintptr offset);
+  undefined compressedTexSubImage3D(GLenum target, GLint level, GLint xoffset, GLint yoffset,
+                                    GLint zoffset, GLsizei width, GLsizei height, GLsizei depth,
+                                    GLenum format, [AllowShared] ArrayBufferView srcData,
+                                    optional GLuint srcOffset = 0,
+                                    optional GLuint srcLengthOverride = 0);
+
+  /* Programs and shaders */
+  [WebGLHandlesContextLoss] GLint getFragDataLocation(WebGLProgram program, DOMString name);
+
+  /* Uniforms */
+  undefined uniform1ui(WebGLUniformLocation? location, GLuint v0);
+  undefined uniform2ui(WebGLUniformLocation? location, GLuint v0, GLuint v1);
+  undefined uniform3ui(WebGLUniformLocation? location, GLuint v0, GLuint v1, GLuint v2);
+  undefined uniform4ui(WebGLUniformLocation? location, GLuint v0, GLuint v1, GLuint v2, GLuint v3);
+
+  undefined uniform1uiv(WebGLUniformLocation? location, Uint32List data, optional GLuint srcOffset = 0,
+                        optional GLuint srcLength = 0);
+  undefined uniform2uiv(WebGLUniformLocation? location, Uint32List data, optional GLuint srcOffset = 0,
+                        optional GLuint srcLength = 0);
+  undefined uniform3uiv(WebGLUniformLocation? location, Uint32List data, optional GLuint srcOffset = 0,
+                        optional GLuint srcLength = 0);
+  undefined uniform4uiv(WebGLUniformLocation? location, Uint32List data, optional GLuint srcOffset = 0,
+                        optional GLuint srcLength = 0);
+  undefined uniformMatrix3x2fv(WebGLUniformLocation? location, GLboolean transpose, Float32List data,
+                               optional GLuint srcOffset = 0, optional GLuint srcLength = 0);
+  undefined uniformMatrix4x2fv(WebGLUniformLocation? location, GLboolean transpose, Float32List data,
+                               optional GLuint srcOffset = 0, optional GLuint srcLength = 0);
+
+  undefined uniformMatrix2x3fv(WebGLUniformLocation? location, GLboolean transpose, Float32List data,
+                               optional GLuint srcOffset = 0, optional GLuint srcLength = 0);
+  undefined uniformMatrix4x3fv(WebGLUniformLocation? location, GLboolean transpose, Float32List data,
+                               optional GLuint srcOffset = 0, optional GLuint srcLength = 0);
+
+  undefined uniformMatrix2x4fv(WebGLUniformLocation? location, GLboolean transpose, Float32List data,
+                               optional GLuint srcOffset = 0, optional GLuint srcLength = 0);
+  undefined uniformMatrix3x4fv(WebGLUniformLocation? location, GLboolean transpose, Float32List data,
+                               optional GLuint srcOffset = 0, optional GLuint srcLength = 0);
+
+  /* Vertex attribs */
+  undefined vertexAttribI4i(GLuint index, GLint x, GLint y, GLint z, GLint w);
+  undefined vertexAttribI4iv(GLuint index, Int32List values);
+  undefined vertexAttribI4ui(GLuint index, GLuint x, GLuint y, GLuint z, GLuint w);
+  undefined vertexAttribI4uiv(GLuint index, Uint32List values);
+  undefined vertexAttribIPointer(GLuint index, GLint size, GLenum type, GLsizei stride, GLintptr offset);
+
+  /* Writing to the drawing buffer */
+  undefined vertexAttribDivisor(GLuint index, GLuint divisor);
+  undefined drawArraysInstanced(GLenum mode, GLint first, GLsizei count, GLsizei instanceCount);
+  undefined drawElementsInstanced(GLenum mode, GLsizei count, GLenum type, GLintptr offset, GLsizei instanceCount);
+  undefined drawRangeElements(GLenum mode, GLuint start, GLuint end, GLsizei count, GLenum type, GLintptr offset);
+
+  /* Multiple Render Targets */
+  undefined drawBuffers(sequence<GLenum> buffers);
+
+  undefined clearBufferfv(GLenum buffer, GLint drawbuffer, Float32List values,
+                          optional GLuint srcOffset = 0);
+  undefined clearBufferiv(GLenum buffer, GLint drawbuffer, Int32List values,
+                          optional GLuint srcOffset = 0);
+  undefined clearBufferuiv(GLenum buffer, GLint drawbuffer, Uint32List values,
+                           optional GLuint srcOffset = 0);
+
+  undefined clearBufferfi(GLenum buffer, GLint drawbuffer, GLfloat depth, GLint stencil);
+
+  /* Query Objects */
+  WebGLQuery? createQuery();
+  undefined deleteQuery(WebGLQuery? query);
+  [WebGLHandlesContextLoss] GLboolean isQuery(WebGLQuery? query);
+  undefined beginQuery(GLenum target, WebGLQuery query);
+  undefined endQuery(GLenum target);
+  WebGLQuery? getQuery(GLenum target, GLenum pname);
+  any getQueryParameter(WebGLQuery query, GLenum pname);
+
+  /* Sampler Objects */
+  WebGLSampler? createSampler();
+  undefined deleteSampler(WebGLSampler? sampler);
+  [WebGLHandlesContextLoss] GLboolean isSampler(WebGLSampler? sampler);
+  undefined bindSampler(GLuint unit, WebGLSampler? sampler);
+  undefined samplerParameteri(WebGLSampler sampler, GLenum pname, GLint param);
+  undefined samplerParameterf(WebGLSampler sampler, GLenum pname, GLfloat param);
+  any getSamplerParameter(WebGLSampler sampler, GLenum pname);
+
+  /* Sync objects */
+  WebGLSync? fenceSync(GLenum condition, GLbitfield flags);
+  [WebGLHandlesContextLoss] GLboolean isSync(WebGLSync? sync);
+  undefined deleteSync(WebGLSync? sync);
+  GLenum clientWaitSync(WebGLSync sync, GLbitfield flags, GLuint64 timeout);
+  undefined waitSync(WebGLSync sync, GLbitfield flags, GLint64 timeout);
+  any getSyncParameter(WebGLSync sync, GLenum pname);
+
+  /* Transform Feedback */
+  WebGLTransformFeedback? createTransformFeedback();
+  undefined deleteTransformFeedback(WebGLTransformFeedback? tf);
+  [WebGLHandlesContextLoss] GLboolean isTransformFeedback(WebGLTransformFeedback? tf);
+  undefined bindTransformFeedback (GLenum target, WebGLTransformFeedback? tf);
+  undefined beginTransformFeedback(GLenum primitiveMode);
+  undefined endTransformFeedback();
+  undefined transformFeedbackVaryings(WebGLProgram program, sequence<DOMString> varyings, GLenum bufferMode);
+  WebGLActiveInfo? getTransformFeedbackVarying(WebGLProgram program, GLuint index);
+  undefined pauseTransformFeedback();
+  undefined resumeTransformFeedback();
+
+  /* Uniform Buffer Objects and Transform Feedback Buffers */
+  undefined bindBufferBase(GLenum target, GLuint index, WebGLBuffer? buffer);
+  undefined bindBufferRange(GLenum target, GLuint index, WebGLBuffer? buffer, GLintptr offset, GLsizeiptr size);
+  any getIndexedParameter(GLenum target, GLuint index);
+  sequence<GLuint>? getUniformIndices(WebGLProgram program, sequence<DOMString> uniformNames);
+  any getActiveUniforms(WebGLProgram program, sequence<GLuint> uniformIndices, GLenum pname);
+  GLuint getUniformBlockIndex(WebGLProgram program, DOMString uniformBlockName);
+  any getActiveUniformBlockParameter(WebGLProgram program, GLuint uniformBlockIndex, GLenum pname);
+  DOMString? getActiveUniformBlockName(WebGLProgram program, GLuint uniformBlockIndex);
+  undefined uniformBlockBinding(WebGLProgram program, GLuint uniformBlockIndex, GLuint uniformBlockBinding);
+
+  /* Vertex Array Objects */
+  WebGLVertexArrayObject? createVertexArray();
+  undefined deleteVertexArray(WebGLVertexArrayObject? vertexArray);
+  [WebGLHandlesContextLoss] GLboolean isVertexArray(WebGLVertexArrayObject? vertexArray);
+  undefined bindVertexArray(WebGLVertexArrayObject? array);
+};
+
+interface mixin WebGL2RenderingContextOverloads
+{
+  // WebGL1:
+  undefined bufferData(GLenum target, GLsizeiptr size, GLenum usage);
+  undefined bufferData(GLenum target, [AllowShared] BufferSource? srcData, GLenum usage);
+  undefined bufferSubData(GLenum target, GLintptr dstByteOffset, [AllowShared] BufferSource srcData);
+  // WebGL2:
+  undefined bufferData(GLenum target, [AllowShared] ArrayBufferView srcData, GLenum usage, GLuint srcOffset,
+                       optional GLuint length = 0);
+  undefined bufferSubData(GLenum target, GLintptr dstByteOffset, [AllowShared] ArrayBufferView srcData,
+                          GLuint srcOffset, optional GLuint length = 0);
+
+  // WebGL1 legacy entrypoints:
+  undefined texImage2D(GLenum target, GLint level, GLint internalformat,
+                       GLsizei width, GLsizei height, GLint border, GLenum format,
+                       GLenum type, [AllowShared] ArrayBufferView? pixels);
+  undefined texImage2D(GLenum target, GLint level, GLint internalformat,
+                       GLenum format, GLenum type, TexImageSource source); // May throw DOMException
+
+  undefined texSubImage2D(GLenum target, GLint level, GLint xoffset, GLint yoffset,
+                          GLsizei width, GLsizei height,
+                          GLenum format, GLenum type, [AllowShared] ArrayBufferView? pixels);
+  undefined texSubImage2D(GLenum target, GLint level, GLint xoffset, GLint yoffset,
+                          GLenum format, GLenum type, TexImageSource source); // May throw DOMException
+
+  // WebGL2 entrypoints:
+  undefined texImage2D(GLenum target, GLint level, GLint internalformat, GLsizei width, GLsizei height,
+                       GLint border, GLenum format, GLenum type, GLintptr pboOffset);
+  undefined texImage2D(GLenum target, GLint level, GLint internalformat, GLsizei width, GLsizei height,
+                       GLint border, GLenum format, GLenum type,
+                       TexImageSource source); // May throw DOMException
+  undefined texImage2D(GLenum target, GLint level, GLint internalformat, GLsizei width, GLsizei height,
+                       GLint border, GLenum format, GLenum type, [AllowShared] ArrayBufferView srcData,
+                       GLuint srcOffset);
+
+  undefined texSubImage2D(GLenum target, GLint level, GLint xoffset, GLint yoffset, GLsizei width,
+                          GLsizei height, GLenum format, GLenum type, GLintptr pboOffset);
+  undefined texSubImage2D(GLenum target, GLint level, GLint xoffset, GLint yoffset, GLsizei width,
+                          GLsizei height, GLenum format, GLenum type,
+                          TexImageSource source); // May throw DOMException
+  undefined texSubImage2D(GLenum target, GLint level, GLint xoffset, GLint yoffset, GLsizei width,
+                          GLsizei height, GLenum format, GLenum type, [AllowShared] ArrayBufferView srcData,
+                          GLuint srcOffset);
+
+  undefined compressedTexImage2D(GLenum target, GLint level, GLenum internalformat, GLsizei width,
+                                 GLsizei height, GLint border, GLsizei imageSize, GLintptr offset);
+  undefined compressedTexImage2D(GLenum target, GLint level, GLenum internalformat, GLsizei width,
+                                 GLsizei height, GLint border, [AllowShared] ArrayBufferView srcData,
+                                 optional GLuint srcOffset = 0, optional GLuint srcLengthOverride = 0);
+
+  undefined compressedTexSubImage2D(GLenum target, GLint level, GLint xoffset, GLint yoffset,
+                                    GLsizei width, GLsizei height, GLenum format, GLsizei imageSize, GLintptr offset);
+  undefined compressedTexSubImage2D(GLenum target, GLint level, GLint xoffset, GLint yoffset,
+                                    GLsizei width, GLsizei height, GLenum format,
+                                    [AllowShared] ArrayBufferView srcData,
+                                    optional GLuint srcOffset = 0,
+                                    optional GLuint srcLengthOverride = 0);
+
+  undefined uniform1fv(WebGLUniformLocation? location, Float32List data, optional GLuint srcOffset = 0,
+                       optional GLuint srcLength = 0);
+  undefined uniform2fv(WebGLUniformLocation? location, Float32List data, optional GLuint srcOffset = 0,
+                       optional GLuint srcLength = 0);
+  undefined uniform3fv(WebGLUniformLocation? location, Float32List data, optional GLuint srcOffset = 0,
+                       optional GLuint srcLength = 0);
+  undefined uniform4fv(WebGLUniformLocation? location, Float32List data, optional GLuint srcOffset = 0,
+                       optional GLuint srcLength = 0);
+
+  undefined uniform1iv(WebGLUniformLocation? location, Int32List data, optional GLuint srcOffset = 0,
+                       optional GLuint srcLength = 0);
+  undefined uniform2iv(WebGLUniformLocation? location, Int32List data, optional GLuint srcOffset = 0,
+                       optional GLuint srcLength = 0);
+  undefined uniform3iv(WebGLUniformLocation? location, Int32List data, optional GLuint srcOffset = 0,
+                       optional GLuint srcLength = 0);
+  undefined uniform4iv(WebGLUniformLocation? location, Int32List data, optional GLuint srcOffset = 0,
+                       optional GLuint srcLength = 0);
+
+  undefined uniformMatrix2fv(WebGLUniformLocation? location, GLboolean transpose, Float32List data,
+                             optional GLuint srcOffset = 0, optional GLuint srcLength = 0);
+  undefined uniformMatrix3fv(WebGLUniformLocation? location, GLboolean transpose, Float32List data,
+                             optional GLuint srcOffset = 0, optional GLuint srcLength = 0);
+  undefined uniformMatrix4fv(WebGLUniformLocation? location, GLboolean transpose, Float32List data,
+                             optional GLuint srcOffset = 0, optional GLuint srcLength = 0);
+
+  /* Reading back pixels */
+  // WebGL1:
+  undefined readPixels(GLint x, GLint y, GLsizei width, GLsizei height, GLenum format, GLenum type,
+                       [AllowShared] ArrayBufferView? dstData);
+  // WebGL2:
+  undefined readPixels(GLint x, GLint y, GLsizei width, GLsizei height, GLenum format, GLenum type,
+                       GLintptr offset);
+  undefined readPixels(GLint x, GLint y, GLsizei width, GLsizei height, GLenum format, GLenum type,
+                       [AllowShared] ArrayBufferView dstData, GLuint dstOffset);
+};
+
+[Exposed=(Window,Worker)]
+interface WebGL2RenderingContext
+{
+};
+WebGL2RenderingContext includes WebGLRenderingContextBase;
+WebGL2RenderingContext includes WebGL2RenderingContextBase;
+WebGL2RenderingContext includes WebGL2RenderingContextOverloads;
diff --git a/test/wpt/tests/interfaces/webgpu.idl b/test/wpt/tests/interfaces/webgpu.idl
new file mode 100644
index 00000000000..b00e2374e58
--- /dev/null
+++ b/test/wpt/tests/interfaces/webgpu.idl
@@ -0,0 +1,1265 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: WebGPU (https://gpuweb.github.io/gpuweb/)
+
+interface mixin GPUObjectBase {
+    attribute USVString label;
+};
+
+dictionary GPUObjectDescriptorBase {
+    USVString label;
+};
+
+[Exposed=(Window, DedicatedWorker), SecureContext]
+interface GPUSupportedLimits {
+    readonly attribute unsigned long maxTextureDimension1D;
+    readonly attribute unsigned long maxTextureDimension2D;
+    readonly attribute unsigned long maxTextureDimension3D;
+    readonly attribute unsigned long maxTextureArrayLayers;
+    readonly attribute unsigned long maxBindGroups;
+    readonly attribute unsigned long maxBindingsPerBindGroup;
+    readonly attribute unsigned long maxDynamicUniformBuffersPerPipelineLayout;
+    readonly attribute unsigned long maxDynamicStorageBuffersPerPipelineLayout;
+    readonly attribute unsigned long maxSampledTexturesPerShaderStage;
+    readonly attribute unsigned long maxSamplersPerShaderStage;
+    readonly attribute unsigned long maxStorageBuffersPerShaderStage;
+    readonly attribute unsigned long maxStorageTexturesPerShaderStage;
+    readonly attribute unsigned long maxUniformBuffersPerShaderStage;
+    readonly attribute unsigned long long maxUniformBufferBindingSize;
+    readonly attribute unsigned long long maxStorageBufferBindingSize;
+    readonly attribute unsigned long minUniformBufferOffsetAlignment;
+    readonly attribute unsigned long minStorageBufferOffsetAlignment;
+    readonly attribute unsigned long maxVertexBuffers;
+    readonly attribute unsigned long long maxBufferSize;
+    readonly attribute unsigned long maxVertexAttributes;
+    readonly attribute unsigned long maxVertexBufferArrayStride;
+    readonly attribute unsigned long maxInterStageShaderComponents;
+    readonly attribute unsigned long maxInterStageShaderVariables;
+    readonly attribute unsigned long maxColorAttachments;
+    readonly attribute unsigned long maxColorAttachmentBytesPerSample;
+    readonly attribute unsigned long maxComputeWorkgroupStorageSize;
+    readonly attribute unsigned long maxComputeInvocationsPerWorkgroup;
+    readonly attribute unsigned long maxComputeWorkgroupSizeX;
+    readonly attribute unsigned long maxComputeWorkgroupSizeY;
+    readonly attribute unsigned long maxComputeWorkgroupSizeZ;
+    readonly attribute unsigned long maxComputeWorkgroupsPerDimension;
+};
+
+[Exposed=(Window, DedicatedWorker), SecureContext]
+interface GPUSupportedFeatures {
+    readonly setlike<DOMString>;
+};
+
+[Exposed=(Window, DedicatedWorker), SecureContext]
+interface GPUAdapterInfo {
+    readonly attribute DOMString vendor;
+    readonly attribute DOMString architecture;
+    readonly attribute DOMString device;
+    readonly attribute DOMString description;
+};
+
+interface mixin NavigatorGPU {
+    [SameObject, SecureContext] readonly attribute GPU gpu;
+};
+Navigator includes NavigatorGPU;
+WorkerNavigator includes NavigatorGPU;
+
+[Exposed=(Window, DedicatedWorker), SecureContext]
+interface GPU {
+    Promise<GPUAdapter?> requestAdapter(optional GPURequestAdapterOptions options = {});
+    GPUTextureFormat getPreferredCanvasFormat();
+};
+
+dictionary GPURequestAdapterOptions {
+    GPUPowerPreference powerPreference;
+    boolean forceFallbackAdapter = false;
+};
+
+enum GPUPowerPreference {
+    "low-power",
+    "high-performance"
+};
+
+[Exposed=(Window, DedicatedWorker), SecureContext]
+interface GPUAdapter {
+    [SameObject] readonly attribute GPUSupportedFeatures features;
+    [SameObject] readonly attribute GPUSupportedLimits limits;
+    readonly attribute boolean isFallbackAdapter;
+
+    Promise<GPUDevice> requestDevice(optional GPUDeviceDescriptor descriptor = {});
+    Promise<GPUAdapterInfo> requestAdapterInfo(optional sequence<DOMString> unmaskHints = []);
+};
+
+dictionary GPUDeviceDescriptor : GPUObjectDescriptorBase {
+    sequence<GPUFeatureName> requiredFeatures = [];
+    record<DOMString, GPUSize64> requiredLimits = {};
+    GPUQueueDescriptor defaultQueue = {};
+};
+
+enum GPUFeatureName {
+    "depth-clip-control",
+    "depth32float-stencil8",
+    "texture-compression-bc",
+    "texture-compression-etc2",
+    "texture-compression-astc",
+    "timestamp-query",
+    "indirect-first-instance",
+    "shader-f16",
+    "rg11b10ufloat-renderable"
+};
+
+[Exposed=(Window, DedicatedWorker), SecureContext]
+interface GPUDevice : EventTarget {
+    [SameObject] readonly attribute GPUSupportedFeatures features;
+    [SameObject] readonly attribute GPUSupportedLimits limits;
+
+    [SameObject] readonly attribute GPUQueue queue;
+
+    undefined destroy();
+
+    GPUBuffer createBuffer(GPUBufferDescriptor descriptor);
+    GPUTexture createTexture(GPUTextureDescriptor descriptor);
+    GPUSampler createSampler(optional GPUSamplerDescriptor descriptor = {});
+    GPUExternalTexture importExternalTexture(GPUExternalTextureDescriptor descriptor);
+
+    GPUBindGroupLayout createBindGroupLayout(GPUBindGroupLayoutDescriptor descriptor);
+    GPUPipelineLayout createPipelineLayout(GPUPipelineLayoutDescriptor descriptor);
+    GPUBindGroup createBindGroup(GPUBindGroupDescriptor descriptor);
+
+    GPUShaderModule createShaderModule(GPUShaderModuleDescriptor descriptor);
+    GPUComputePipeline createComputePipeline(GPUComputePipelineDescriptor descriptor);
+    GPURenderPipeline createRenderPipeline(GPURenderPipelineDescriptor descriptor);
+    Promise<GPUComputePipeline> createComputePipelineAsync(GPUComputePipelineDescriptor descriptor);
+    Promise<GPURenderPipeline> createRenderPipelineAsync(GPURenderPipelineDescriptor descriptor);
+
+    GPUCommandEncoder createCommandEncoder(optional GPUCommandEncoderDescriptor descriptor = {});
+    GPURenderBundleEncoder createRenderBundleEncoder(GPURenderBundleEncoderDescriptor descriptor);
+
+    GPUQuerySet createQuerySet(GPUQuerySetDescriptor descriptor);
+};
+GPUDevice includes GPUObjectBase;
+
+[Exposed=(Window, DedicatedWorker), SecureContext]
+interface GPUBuffer {
+    readonly attribute GPUSize64 size;
+    readonly attribute GPUBufferUsageFlags usage;
+
+    readonly attribute GPUBufferMapState mapState;
+
+    Promise<undefined> mapAsync(GPUMapModeFlags mode, optional GPUSize64 offset = 0, optional GPUSize64 size);
+    ArrayBuffer getMappedRange(optional GPUSize64 offset = 0, optional GPUSize64 size);
+    undefined unmap();
+
+    undefined destroy();
+};
+GPUBuffer includes GPUObjectBase;
+
+enum GPUBufferMapState {
+    "unmapped",
+    "pending",
+    "mapped"
+};
+
+dictionary GPUBufferDescriptor : GPUObjectDescriptorBase {
+    required GPUSize64 size;
+    required GPUBufferUsageFlags usage;
+    boolean mappedAtCreation = false;
+};
+
+typedef [EnforceRange] unsigned long GPUBufferUsageFlags;
+[Exposed=(Window, DedicatedWorker)]
+namespace GPUBufferUsage {
+    const GPUFlagsConstant MAP_READ      = 0x0001;
+    const GPUFlagsConstant MAP_WRITE     = 0x0002;
+    const GPUFlagsConstant COPY_SRC      = 0x0004;
+    const GPUFlagsConstant COPY_DST      = 0x0008;
+    const GPUFlagsConstant INDEX         = 0x0010;
+    const GPUFlagsConstant VERTEX        = 0x0020;
+    const GPUFlagsConstant UNIFORM       = 0x0040;
+    const GPUFlagsConstant STORAGE       = 0x0080;
+    const GPUFlagsConstant INDIRECT      = 0x0100;
+    const GPUFlagsConstant QUERY_RESOLVE = 0x0200;
+};
+
+typedef [EnforceRange] unsigned long GPUMapModeFlags;
+[Exposed=(Window, DedicatedWorker)]
+namespace GPUMapMode {
+    const GPUFlagsConstant READ  = 0x0001;
+    const GPUFlagsConstant WRITE = 0x0002;
+};
+
+[Exposed=(Window, DedicatedWorker), SecureContext]
+interface GPUTexture {
+    GPUTextureView createView(optional GPUTextureViewDescriptor descriptor = {});
+
+    undefined destroy();
+
+    readonly attribute GPUIntegerCoordinate width;
+    readonly attribute GPUIntegerCoordinate height;
+    readonly attribute GPUIntegerCoordinate depthOrArrayLayers;
+    readonly attribute GPUIntegerCoordinate mipLevelCount;
+    readonly attribute GPUSize32 sampleCount;
+    readonly attribute GPUTextureDimension dimension;
+    readonly attribute GPUTextureFormat format;
+    readonly attribute GPUTextureUsageFlags usage;
+};
+GPUTexture includes GPUObjectBase;
+
+dictionary GPUTextureDescriptor : GPUObjectDescriptorBase {
+    required GPUExtent3D size;
+    GPUIntegerCoordinate mipLevelCount = 1;
+    GPUSize32 sampleCount = 1;
+    GPUTextureDimension dimension = "2d";
+    required GPUTextureFormat format;
+    required GPUTextureUsageFlags usage;
+    sequence<GPUTextureFormat> viewFormats = [];
+};
+
+enum GPUTextureDimension {
+    "1d",
+    "2d",
+    "3d"
+};
+
+typedef [EnforceRange] unsigned long GPUTextureUsageFlags;
+[Exposed=(Window, DedicatedWorker)]
+namespace GPUTextureUsage {
+    const GPUFlagsConstant COPY_SRC          = 0x01;
+    const GPUFlagsConstant COPY_DST          = 0x02;
+    const GPUFlagsConstant TEXTURE_BINDING   = 0x04;
+    const GPUFlagsConstant STORAGE_BINDING   = 0x08;
+    const GPUFlagsConstant RENDER_ATTACHMENT = 0x10;
+};
+
+[Exposed=(Window, DedicatedWorker), SecureContext]
+interface GPUTextureView {
+};
+GPUTextureView includes GPUObjectBase;
+
+dictionary GPUTextureViewDescriptor : GPUObjectDescriptorBase {
+    GPUTextureFormat format;
+    GPUTextureViewDimension dimension;
+    GPUTextureAspect aspect = "all";
+    GPUIntegerCoordinate baseMipLevel = 0;
+    GPUIntegerCoordinate mipLevelCount;
+    GPUIntegerCoordinate baseArrayLayer = 0;
+    GPUIntegerCoordinate arrayLayerCount;
+};
+
+enum GPUTextureViewDimension {
+    "1d",
+    "2d",
+    "2d-array",
+    "cube",
+    "cube-array",
+    "3d"
+};
+
+enum GPUTextureAspect {
+    "all",
+    "stencil-only",
+    "depth-only"
+};
+
+enum GPUTextureFormat {
+    // 8-bit formats
+    "r8unorm",
+    "r8snorm",
+    "r8uint",
+    "r8sint",
+
+    // 16-bit formats
+    "r16uint",
+    "r16sint",
+    "r16float",
+    "rg8unorm",
+    "rg8snorm",
+    "rg8uint",
+    "rg8sint",
+
+    // 32-bit formats
+    "r32uint",
+    "r32sint",
+    "r32float",
+    "rg16uint",
+    "rg16sint",
+    "rg16float",
+    "rgba8unorm",
+    "rgba8unorm-srgb",
+    "rgba8snorm",
+    "rgba8uint",
+    "rgba8sint",
+    "bgra8unorm",
+    "bgra8unorm-srgb",
+    // Packed 32-bit formats
+    "rgb9e5ufloat",
+    "rgb10a2unorm",
+    "rg11b10ufloat",
+
+    // 64-bit formats
+    "rg32uint",
+    "rg32sint",
+    "rg32float",
+    "rgba16uint",
+    "rgba16sint",
+    "rgba16float",
+
+    // 128-bit formats
+    "rgba32uint",
+    "rgba32sint",
+    "rgba32float",
+
+    // Depth/stencil formats
+    "stencil8",
+    "depth16unorm",
+    "depth24plus",
+    "depth24plus-stencil8",
+    "depth32float",
+
+    // "depth32float-stencil8" feature
+    "depth32float-stencil8",
+
+    // BC compressed formats usable if "texture-compression-bc" is both
+    // supported by the device/user agent and enabled in requestDevice.
+    "bc1-rgba-unorm",
+    "bc1-rgba-unorm-srgb",
+    "bc2-rgba-unorm",
+    "bc2-rgba-unorm-srgb",
+    "bc3-rgba-unorm",
+    "bc3-rgba-unorm-srgb",
+    "bc4-r-unorm",
+    "bc4-r-snorm",
+    "bc5-rg-unorm",
+    "bc5-rg-snorm",
+    "bc6h-rgb-ufloat",
+    "bc6h-rgb-float",
+    "bc7-rgba-unorm",
+    "bc7-rgba-unorm-srgb",
+
+    // ETC2 compressed formats usable if "texture-compression-etc2" is both
+    // supported by the device/user agent and enabled in requestDevice.
+    "etc2-rgb8unorm",
+    "etc2-rgb8unorm-srgb",
+    "etc2-rgb8a1unorm",
+    "etc2-rgb8a1unorm-srgb",
+    "etc2-rgba8unorm",
+    "etc2-rgba8unorm-srgb",
+    "eac-r11unorm",
+    "eac-r11snorm",
+    "eac-rg11unorm",
+    "eac-rg11snorm",
+
+    // ASTC compressed formats usable if "texture-compression-astc" is both
+    // supported by the device/user agent and enabled in requestDevice.
+    "astc-4x4-unorm",
+    "astc-4x4-unorm-srgb",
+    "astc-5x4-unorm",
+    "astc-5x4-unorm-srgb",
+    "astc-5x5-unorm",
+    "astc-5x5-unorm-srgb",
+    "astc-6x5-unorm",
+    "astc-6x5-unorm-srgb",
+    "astc-6x6-unorm",
+    "astc-6x6-unorm-srgb",
+    "astc-8x5-unorm",
+    "astc-8x5-unorm-srgb",
+    "astc-8x6-unorm",
+    "astc-8x6-unorm-srgb",
+    "astc-8x8-unorm",
+    "astc-8x8-unorm-srgb",
+    "astc-10x5-unorm",
+    "astc-10x5-unorm-srgb",
+    "astc-10x6-unorm",
+    "astc-10x6-unorm-srgb",
+    "astc-10x8-unorm",
+    "astc-10x8-unorm-srgb",
+    "astc-10x10-unorm",
+    "astc-10x10-unorm-srgb",
+    "astc-12x10-unorm",
+    "astc-12x10-unorm-srgb",
+    "astc-12x12-unorm",
+    "astc-12x12-unorm-srgb"
+};
+
+[Exposed=(Window, DedicatedWorker), SecureContext]
+interface GPUExternalTexture {
+    readonly attribute boolean expired;
+};
+GPUExternalTexture includes GPUObjectBase;
+
+dictionary GPUExternalTextureDescriptor : GPUObjectDescriptorBase {
+    required HTMLVideoElement source;
+    PredefinedColorSpace colorSpace = "srgb";
+};
+
+[Exposed=(Window, DedicatedWorker), SecureContext]
+interface GPUSampler {
+};
+GPUSampler includes GPUObjectBase;
+
+dictionary GPUSamplerDescriptor : GPUObjectDescriptorBase {
+    GPUAddressMode addressModeU = "clamp-to-edge";
+    GPUAddressMode addressModeV = "clamp-to-edge";
+    GPUAddressMode addressModeW = "clamp-to-edge";
+    GPUFilterMode magFilter = "nearest";
+    GPUFilterMode minFilter = "nearest";
+    GPUMipmapFilterMode mipmapFilter = "nearest";
+    float lodMinClamp = 0;
+    float lodMaxClamp = 32;
+    GPUCompareFunction compare;
+    [Clamp] unsigned short maxAnisotropy = 1;
+};
+
+enum GPUAddressMode {
+    "clamp-to-edge",
+    "repeat",
+    "mirror-repeat"
+};
+
+enum GPUFilterMode {
+    "nearest",
+    "linear"
+};
+
+enum GPUMipmapFilterMode {
+    "nearest",
+    "linear"
+};
+
+enum GPUCompareFunction {
+    "never",
+    "less",
+    "equal",
+    "less-equal",
+    "greater",
+    "not-equal",
+    "greater-equal",
+    "always"
+};
+
+[Exposed=(Window, DedicatedWorker), SecureContext]
+interface GPUBindGroupLayout {
+};
+GPUBindGroupLayout includes GPUObjectBase;
+
+dictionary GPUBindGroupLayoutDescriptor : GPUObjectDescriptorBase {
+    required sequence<GPUBindGroupLayoutEntry> entries;
+};
+
+dictionary GPUBindGroupLayoutEntry {
+    required GPUIndex32 binding;
+    required GPUShaderStageFlags visibility;
+
+    GPUBufferBindingLayout buffer;
+    GPUSamplerBindingLayout sampler;
+    GPUTextureBindingLayout texture;
+    GPUStorageTextureBindingLayout storageTexture;
+    GPUExternalTextureBindingLayout externalTexture;
+};
+
+typedef [EnforceRange] unsigned long GPUShaderStageFlags;
+[Exposed=(Window, DedicatedWorker)]
+namespace GPUShaderStage {
+    const GPUFlagsConstant VERTEX   = 0x1;
+    const GPUFlagsConstant FRAGMENT = 0x2;
+    const GPUFlagsConstant COMPUTE  = 0x4;
+};
+
+enum GPUBufferBindingType {
+    "uniform",
+    "storage",
+    "read-only-storage"
+};
+
+dictionary GPUBufferBindingLayout {
+    GPUBufferBindingType type = "uniform";
+    boolean hasDynamicOffset = false;
+    GPUSize64 minBindingSize = 0;
+};
+
+enum GPUSamplerBindingType {
+    "filtering",
+    "non-filtering",
+    "comparison"
+};
+
+dictionary GPUSamplerBindingLayout {
+    GPUSamplerBindingType type = "filtering";
+};
+
+enum GPUTextureSampleType {
+    "float",
+    "unfilterable-float",
+    "depth",
+    "sint",
+    "uint"
+};
+
+dictionary GPUTextureBindingLayout {
+    GPUTextureSampleType sampleType = "float";
+    GPUTextureViewDimension viewDimension = "2d";
+    boolean multisampled = false;
+};
+
+enum GPUStorageTextureAccess {
+    "write-only"
+};
+
+dictionary GPUStorageTextureBindingLayout {
+    GPUStorageTextureAccess access = "write-only";
+    required GPUTextureFormat format;
+    GPUTextureViewDimension viewDimension = "2d";
+};
+
+dictionary GPUExternalTextureBindingLayout {
+};
+
+[Exposed=(Window, DedicatedWorker), SecureContext]
+interface GPUBindGroup {
+};
+GPUBindGroup includes GPUObjectBase;
+
+dictionary GPUBindGroupDescriptor : GPUObjectDescriptorBase {
+    required GPUBindGroupLayout layout;
+    required sequence<GPUBindGroupEntry> entries;
+};
+
+typedef (GPUSampler or GPUTextureView or GPUBufferBinding or GPUExternalTexture) GPUBindingResource;
+
+dictionary GPUBindGroupEntry {
+    required GPUIndex32 binding;
+    required GPUBindingResource resource;
+};
+
+dictionary GPUBufferBinding {
+    required GPUBuffer buffer;
+    GPUSize64 offset = 0;
+    GPUSize64 size;
+};
+
+[Exposed=(Window, DedicatedWorker), SecureContext]
+interface GPUPipelineLayout {
+};
+GPUPipelineLayout includes GPUObjectBase;
+
+dictionary GPUPipelineLayoutDescriptor : GPUObjectDescriptorBase {
+    required sequence<GPUBindGroupLayout> bindGroupLayouts;
+};
+
+[Exposed=(Window, DedicatedWorker), SecureContext]
+interface GPUShaderModule {
+    Promise<GPUCompilationInfo> compilationInfo();
+};
+GPUShaderModule includes GPUObjectBase;
+
+dictionary GPUShaderModuleDescriptor : GPUObjectDescriptorBase {
+    required USVString code;
+    object sourceMap;
+    record<USVString, GPUShaderModuleCompilationHint> hints;
+};
+
+dictionary GPUShaderModuleCompilationHint {
+    (GPUPipelineLayout or GPUAutoLayoutMode) layout;
+};
+
+enum GPUCompilationMessageType {
+    "error",
+    "warning",
+    "info"
+};
+
+[Exposed=(Window, DedicatedWorker), Serializable, SecureContext]
+interface GPUCompilationMessage {
+    readonly attribute DOMString message;
+    readonly attribute GPUCompilationMessageType type;
+    readonly attribute unsigned long long lineNum;
+    readonly attribute unsigned long long linePos;
+    readonly attribute unsigned long long offset;
+    readonly attribute unsigned long long length;
+};
+
+[Exposed=(Window, DedicatedWorker), Serializable, SecureContext]
+interface GPUCompilationInfo {
+    readonly attribute FrozenArray<GPUCompilationMessage> messages;
+};
+
+[Exposed=(Window, DedicatedWorker), SecureContext, Serializable]
+interface GPUPipelineError : DOMException {
+    constructor(DOMString message, GPUPipelineErrorInit options);
+    readonly attribute GPUPipelineErrorReason reason;
+};
+
+dictionary GPUPipelineErrorInit {
+    required GPUPipelineErrorReason reason;
+};
+
+enum GPUPipelineErrorReason {
+    "validation",
+    "internal"
+};
+
+enum GPUAutoLayoutMode {
+    "auto"
+};
+
+dictionary GPUPipelineDescriptorBase : GPUObjectDescriptorBase {
+    required (GPUPipelineLayout or GPUAutoLayoutMode) layout;
+};
+
+interface mixin GPUPipelineBase {
+    [NewObject] GPUBindGroupLayout getBindGroupLayout(unsigned long index);
+};
+
+dictionary GPUProgrammableStage {
+    required GPUShaderModule module;
+    required USVString entryPoint;
+    record<USVString, GPUPipelineConstantValue> constants;
+};
+
+typedef double GPUPipelineConstantValue; // May represent WGSL’s bool, f32, i32, u32, and f16 if enabled.
+
+[Exposed=(Window, DedicatedWorker), SecureContext]
+interface GPUComputePipeline {
+};
+GPUComputePipeline includes GPUObjectBase;
+GPUComputePipeline includes GPUPipelineBase;
+
+dictionary GPUComputePipelineDescriptor : GPUPipelineDescriptorBase {
+    required GPUProgrammableStage compute;
+};
+
+[Exposed=(Window, DedicatedWorker), SecureContext]
+interface GPURenderPipeline {
+};
+GPURenderPipeline includes GPUObjectBase;
+GPURenderPipeline includes GPUPipelineBase;
+
+dictionary GPURenderPipelineDescriptor : GPUPipelineDescriptorBase {
+    required GPUVertexState vertex;
+    GPUPrimitiveState primitive = {};
+    GPUDepthStencilState depthStencil;
+    GPUMultisampleState multisample = {};
+    GPUFragmentState fragment;
+};
+
+dictionary GPUPrimitiveState {
+    GPUPrimitiveTopology topology = "triangle-list";
+    GPUIndexFormat stripIndexFormat;
+    GPUFrontFace frontFace = "ccw";
+    GPUCullMode cullMode = "none";
+
+    // Requires "depth-clip-control" feature.
+    boolean unclippedDepth = false;
+};
+
+enum GPUPrimitiveTopology {
+    "point-list",
+    "line-list",
+    "line-strip",
+    "triangle-list",
+    "triangle-strip"
+};
+
+enum GPUFrontFace {
+    "ccw",
+    "cw"
+};
+
+enum GPUCullMode {
+    "none",
+    "front",
+    "back"
+};
+
+dictionary GPUMultisampleState {
+    GPUSize32 count = 1;
+    GPUSampleMask mask = 0xFFFFFFFF;
+    boolean alphaToCoverageEnabled = false;
+};
+
+dictionary GPUFragmentState : GPUProgrammableStage {
+    required sequence<GPUColorTargetState?> targets;
+};
+
+dictionary GPUColorTargetState {
+    required GPUTextureFormat format;
+
+    GPUBlendState blend;
+    GPUColorWriteFlags writeMask = 0xF;  // GPUColorWrite.ALL
+};
+
+dictionary GPUBlendState {
+    required GPUBlendComponent color;
+    required GPUBlendComponent alpha;
+};
+
+typedef [EnforceRange] unsigned long GPUColorWriteFlags;
+[Exposed=(Window, DedicatedWorker)]
+namespace GPUColorWrite {
+    const GPUFlagsConstant RED   = 0x1;
+    const GPUFlagsConstant GREEN = 0x2;
+    const GPUFlagsConstant BLUE  = 0x4;
+    const GPUFlagsConstant ALPHA = 0x8;
+    const GPUFlagsConstant ALL   = 0xF;
+};
+
+dictionary GPUBlendComponent {
+    GPUBlendOperation operation = "add";
+    GPUBlendFactor srcFactor = "one";
+    GPUBlendFactor dstFactor = "zero";
+};
+
+enum GPUBlendFactor {
+    "zero",
+    "one",
+    "src",
+    "one-minus-src",
+    "src-alpha",
+    "one-minus-src-alpha",
+    "dst",
+    "one-minus-dst",
+    "dst-alpha",
+    "one-minus-dst-alpha",
+    "src-alpha-saturated",
+    "constant",
+    "one-minus-constant"
+};
+
+enum GPUBlendOperation {
+    "add",
+    "subtract",
+    "reverse-subtract",
+    "min",
+    "max"
+};
+
+dictionary GPUDepthStencilState {
+    required GPUTextureFormat format;
+
+    boolean depthWriteEnabled = false;
+    GPUCompareFunction depthCompare = "always";
+
+    GPUStencilFaceState stencilFront = {};
+    GPUStencilFaceState stencilBack = {};
+
+    GPUStencilValue stencilReadMask = 0xFFFFFFFF;
+    GPUStencilValue stencilWriteMask = 0xFFFFFFFF;
+
+    GPUDepthBias depthBias = 0;
+    float depthBiasSlopeScale = 0;
+    float depthBiasClamp = 0;
+};
+
+dictionary GPUStencilFaceState {
+    GPUCompareFunction compare = "always";
+    GPUStencilOperation failOp = "keep";
+    GPUStencilOperation depthFailOp = "keep";
+    GPUStencilOperation passOp = "keep";
+};
+
+enum GPUStencilOperation {
+    "keep",
+    "zero",
+    "replace",
+    "invert",
+    "increment-clamp",
+    "decrement-clamp",
+    "increment-wrap",
+    "decrement-wrap"
+};
+
+enum GPUIndexFormat {
+    "uint16",
+    "uint32"
+};
+
+enum GPUVertexFormat {
+    "uint8x2",
+    "uint8x4",
+    "sint8x2",
+    "sint8x4",
+    "unorm8x2",
+    "unorm8x4",
+    "snorm8x2",
+    "snorm8x4",
+    "uint16x2",
+    "uint16x4",
+    "sint16x2",
+    "sint16x4",
+    "unorm16x2",
+    "unorm16x4",
+    "snorm16x2",
+    "snorm16x4",
+    "float16x2",
+    "float16x4",
+    "float32",
+    "float32x2",
+    "float32x3",
+    "float32x4",
+    "uint32",
+    "uint32x2",
+    "uint32x3",
+    "uint32x4",
+    "sint32",
+    "sint32x2",
+    "sint32x3",
+    "sint32x4"
+};
+
+enum GPUVertexStepMode {
+    "vertex",
+    "instance"
+};
+
+dictionary GPUVertexState : GPUProgrammableStage {
+    sequence<GPUVertexBufferLayout?> buffers = [];
+};
+
+dictionary GPUVertexBufferLayout {
+    required GPUSize64 arrayStride;
+    GPUVertexStepMode stepMode = "vertex";
+    required sequence<GPUVertexAttribute> attributes;
+};
+
+dictionary GPUVertexAttribute {
+    required GPUVertexFormat format;
+    required GPUSize64 offset;
+
+    required GPUIndex32 shaderLocation;
+};
+
+dictionary GPUImageDataLayout {
+    GPUSize64 offset = 0;
+    GPUSize32 bytesPerRow;
+    GPUSize32 rowsPerImage;
+};
+
+dictionary GPUImageCopyBuffer : GPUImageDataLayout {
+    required GPUBuffer buffer;
+};
+
+dictionary GPUImageCopyTexture {
+    required GPUTexture texture;
+    GPUIntegerCoordinate mipLevel = 0;
+    GPUOrigin3D origin = {};
+    GPUTextureAspect aspect = "all";
+};
+
+dictionary GPUImageCopyTextureTagged : GPUImageCopyTexture {
+    PredefinedColorSpace colorSpace = "srgb";
+    boolean premultipliedAlpha = false;
+};
+
+dictionary GPUImageCopyExternalImage {
+    required (ImageBitmap or HTMLVideoElement or HTMLCanvasElement or OffscreenCanvas) source;
+    GPUOrigin2D origin = {};
+    boolean flipY = false;
+};
+
+[Exposed=(Window, DedicatedWorker), SecureContext]
+interface GPUCommandBuffer {
+};
+GPUCommandBuffer includes GPUObjectBase;
+
+dictionary GPUCommandBufferDescriptor : GPUObjectDescriptorBase {
+};
+
+interface mixin GPUCommandsMixin {
+};
+
+[Exposed=(Window, DedicatedWorker), SecureContext]
+interface GPUCommandEncoder {
+    GPURenderPassEncoder beginRenderPass(GPURenderPassDescriptor descriptor);
+    GPUComputePassEncoder beginComputePass(optional GPUComputePassDescriptor descriptor = {});
+
+    undefined copyBufferToBuffer(
+        GPUBuffer source,
+        GPUSize64 sourceOffset,
+        GPUBuffer destination,
+        GPUSize64 destinationOffset,
+        GPUSize64 size);
+
+    undefined copyBufferToTexture(
+        GPUImageCopyBuffer source,
+        GPUImageCopyTexture destination,
+        GPUExtent3D copySize);
+
+    undefined copyTextureToBuffer(
+        GPUImageCopyTexture source,
+        GPUImageCopyBuffer destination,
+        GPUExtent3D copySize);
+
+    undefined copyTextureToTexture(
+        GPUImageCopyTexture source,
+        GPUImageCopyTexture destination,
+        GPUExtent3D copySize);
+
+    undefined clearBuffer(
+        GPUBuffer buffer,
+        optional GPUSize64 offset = 0,
+        optional GPUSize64 size);
+
+    undefined writeTimestamp(GPUQuerySet querySet, GPUSize32 queryIndex);
+
+    undefined resolveQuerySet(
+        GPUQuerySet querySet,
+        GPUSize32 firstQuery,
+        GPUSize32 queryCount,
+        GPUBuffer destination,
+        GPUSize64 destinationOffset);
+
+    GPUCommandBuffer finish(optional GPUCommandBufferDescriptor descriptor = {});
+};
+GPUCommandEncoder includes GPUObjectBase;
+GPUCommandEncoder includes GPUCommandsMixin;
+GPUCommandEncoder includes GPUDebugCommandsMixin;
+
+dictionary GPUCommandEncoderDescriptor : GPUObjectDescriptorBase {
+};
+
+interface mixin GPUBindingCommandsMixin {
+    undefined setBindGroup(GPUIndex32 index, GPUBindGroup bindGroup,
+        optional sequence<GPUBufferDynamicOffset> dynamicOffsets = []);
+
+    undefined setBindGroup(GPUIndex32 index, GPUBindGroup bindGroup,
+        Uint32Array dynamicOffsetsData,
+        GPUSize64 dynamicOffsetsDataStart,
+        GPUSize32 dynamicOffsetsDataLength);
+};
+
+interface mixin GPUDebugCommandsMixin {
+    undefined pushDebugGroup(USVString groupLabel);
+    undefined popDebugGroup();
+    undefined insertDebugMarker(USVString markerLabel);
+};
+
+[Exposed=(Window, DedicatedWorker), SecureContext]
+interface GPUComputePassEncoder {
+    undefined setPipeline(GPUComputePipeline pipeline);
+    undefined dispatchWorkgroups(GPUSize32 workgroupCountX, optional GPUSize32 workgroupCountY = 1, optional GPUSize32 workgroupCountZ = 1);
+    undefined dispatchWorkgroupsIndirect(GPUBuffer indirectBuffer, GPUSize64 indirectOffset);
+
+    undefined end();
+};
+GPUComputePassEncoder includes GPUObjectBase;
+GPUComputePassEncoder includes GPUCommandsMixin;
+GPUComputePassEncoder includes GPUDebugCommandsMixin;
+GPUComputePassEncoder includes GPUBindingCommandsMixin;
+
+enum GPUComputePassTimestampLocation {
+    "beginning",
+    "end"
+};
+
+dictionary GPUComputePassTimestampWrite {
+    required GPUQuerySet querySet;
+    required GPUSize32 queryIndex;
+    required GPUComputePassTimestampLocation location;
+};
+
+typedef sequence<GPUComputePassTimestampWrite> GPUComputePassTimestampWrites;
+
+dictionary GPUComputePassDescriptor : GPUObjectDescriptorBase {
+    GPUComputePassTimestampWrites timestampWrites = [];
+};
+
+[Exposed=(Window, DedicatedWorker), SecureContext]
+interface GPURenderPassEncoder {
+    undefined setViewport(float x, float y,
+        float width, float height,
+        float minDepth, float maxDepth);
+
+    undefined setScissorRect(GPUIntegerCoordinate x, GPUIntegerCoordinate y,
+                        GPUIntegerCoordinate width, GPUIntegerCoordinate height);
+
+    undefined setBlendConstant(GPUColor color);
+    undefined setStencilReference(GPUStencilValue reference);
+
+    undefined beginOcclusionQuery(GPUSize32 queryIndex);
+    undefined endOcclusionQuery();
+
+    undefined executeBundles(sequence<GPURenderBundle> bundles);
+    undefined end();
+};
+GPURenderPassEncoder includes GPUObjectBase;
+GPURenderPassEncoder includes GPUCommandsMixin;
+GPURenderPassEncoder includes GPUDebugCommandsMixin;
+GPURenderPassEncoder includes GPUBindingCommandsMixin;
+GPURenderPassEncoder includes GPURenderCommandsMixin;
+
+enum GPURenderPassTimestampLocation {
+    "beginning",
+    "end"
+};
+
+dictionary GPURenderPassTimestampWrite {
+    required GPUQuerySet querySet;
+    required GPUSize32 queryIndex;
+    required GPURenderPassTimestampLocation location;
+};
+
+typedef sequence<GPURenderPassTimestampWrite> GPURenderPassTimestampWrites;
+
+dictionary GPURenderPassDescriptor : GPUObjectDescriptorBase {
+    required sequence<GPURenderPassColorAttachment?> colorAttachments;
+    GPURenderPassDepthStencilAttachment depthStencilAttachment;
+    GPUQuerySet occlusionQuerySet;
+    GPURenderPassTimestampWrites timestampWrites = [];
+    GPUSize64 maxDrawCount = 50000000;
+};
+
+dictionary GPURenderPassColorAttachment {
+    required GPUTextureView view;
+    GPUTextureView resolveTarget;
+
+    GPUColor clearValue;
+    required GPULoadOp loadOp;
+    required GPUStoreOp storeOp;
+};
+
+dictionary GPURenderPassDepthStencilAttachment {
+    required GPUTextureView view;
+
+    float depthClearValue = 0;
+    GPULoadOp depthLoadOp;
+    GPUStoreOp depthStoreOp;
+    boolean depthReadOnly = false;
+
+    GPUStencilValue stencilClearValue = 0;
+    GPULoadOp stencilLoadOp;
+    GPUStoreOp stencilStoreOp;
+    boolean stencilReadOnly = false;
+};
+
+enum GPULoadOp {
+    "load",
+    "clear"
+};
+
+enum GPUStoreOp {
+    "store",
+    "discard"
+};
+
+dictionary GPURenderPassLayout : GPUObjectDescriptorBase {
+    required sequence<GPUTextureFormat?> colorFormats;
+    GPUTextureFormat depthStencilFormat;
+    GPUSize32 sampleCount = 1;
+};
+
+interface mixin GPURenderCommandsMixin {
+    undefined setPipeline(GPURenderPipeline pipeline);
+
+    undefined setIndexBuffer(GPUBuffer buffer, GPUIndexFormat indexFormat, optional GPUSize64 offset = 0, optional GPUSize64 size);
+    undefined setVertexBuffer(GPUIndex32 slot, GPUBuffer buffer, optional GPUSize64 offset = 0, optional GPUSize64 size);
+
+    undefined draw(GPUSize32 vertexCount, optional GPUSize32 instanceCount = 1,
+        optional GPUSize32 firstVertex = 0, optional GPUSize32 firstInstance = 0);
+    undefined drawIndexed(GPUSize32 indexCount, optional GPUSize32 instanceCount = 1,
+        optional GPUSize32 firstIndex = 0,
+        optional GPUSignedOffset32 baseVertex = 0,
+        optional GPUSize32 firstInstance = 0);
+
+    undefined drawIndirect(GPUBuffer indirectBuffer, GPUSize64 indirectOffset);
+    undefined drawIndexedIndirect(GPUBuffer indirectBuffer, GPUSize64 indirectOffset);
+};
+
+[Exposed=(Window, DedicatedWorker), SecureContext]
+interface GPURenderBundle {
+};
+GPURenderBundle includes GPUObjectBase;
+
+dictionary GPURenderBundleDescriptor : GPUObjectDescriptorBase {
+};
+
+[Exposed=(Window, DedicatedWorker), SecureContext]
+interface GPURenderBundleEncoder {
+    GPURenderBundle finish(optional GPURenderBundleDescriptor descriptor = {});
+};
+GPURenderBundleEncoder includes GPUObjectBase;
+GPURenderBundleEncoder includes GPUCommandsMixin;
+GPURenderBundleEncoder includes GPUDebugCommandsMixin;
+GPURenderBundleEncoder includes GPUBindingCommandsMixin;
+GPURenderBundleEncoder includes GPURenderCommandsMixin;
+
+dictionary GPURenderBundleEncoderDescriptor : GPURenderPassLayout {
+    boolean depthReadOnly = false;
+    boolean stencilReadOnly = false;
+};
+
+dictionary GPUQueueDescriptor : GPUObjectDescriptorBase {
+};
+
+[Exposed=(Window, DedicatedWorker), SecureContext]
+interface GPUQueue {
+    undefined submit(sequence<GPUCommandBuffer> commandBuffers);
+
+    Promise<undefined> onSubmittedWorkDone();
+
+    undefined writeBuffer(
+        GPUBuffer buffer,
+        GPUSize64 bufferOffset,
+        [AllowShared] BufferSource data,
+        optional GPUSize64 dataOffset = 0,
+        optional GPUSize64 size);
+
+    undefined writeTexture(
+        GPUImageCopyTexture destination,
+        [AllowShared] BufferSource data,
+        GPUImageDataLayout dataLayout,
+        GPUExtent3D size);
+
+    undefined copyExternalImageToTexture(
+        GPUImageCopyExternalImage source,
+        GPUImageCopyTextureTagged destination,
+        GPUExtent3D copySize);
+};
+GPUQueue includes GPUObjectBase;
+
+[Exposed=(Window, DedicatedWorker), SecureContext]
+interface GPUQuerySet {
+    undefined destroy();
+
+    readonly attribute GPUQueryType type;
+    readonly attribute GPUSize32 count;
+};
+GPUQuerySet includes GPUObjectBase;
+
+dictionary GPUQuerySetDescriptor : GPUObjectDescriptorBase {
+    required GPUQueryType type;
+    required GPUSize32 count;
+};
+
+enum GPUQueryType {
+    "occlusion",
+    "timestamp"
+};
+
+[Exposed=(Window, DedicatedWorker), SecureContext]
+interface GPUCanvasContext {
+    readonly attribute (HTMLCanvasElement or OffscreenCanvas) canvas;
+
+    undefined configure(GPUCanvasConfiguration configuration);
+    undefined unconfigure();
+
+    GPUTexture getCurrentTexture();
+};
+
+enum GPUCanvasAlphaMode {
+    "opaque",
+    "premultiplied"
+};
+
+dictionary GPUCanvasConfiguration {
+    required GPUDevice device;
+    required GPUTextureFormat format;
+    GPUTextureUsageFlags usage = 0x10;  // GPUTextureUsage.RENDER_ATTACHMENT
+    sequence<GPUTextureFormat> viewFormats = [];
+    PredefinedColorSpace colorSpace = "srgb";
+    GPUCanvasAlphaMode alphaMode = "opaque";
+};
+
+enum GPUDeviceLostReason {
+    "destroyed"
+};
+
+[Exposed=(Window, DedicatedWorker), SecureContext]
+interface GPUDeviceLostInfo {
+    readonly attribute (GPUDeviceLostReason or undefined) reason;
+    readonly attribute DOMString message;
+};
+
+partial interface GPUDevice {
+    readonly attribute Promise<GPUDeviceLostInfo> lost;
+};
+
+[Exposed=(Window, DedicatedWorker), SecureContext]
+interface GPUError {
+    readonly attribute DOMString message;
+};
+
+[Exposed=(Window, DedicatedWorker), SecureContext]
+interface GPUValidationError : GPUError {
+    constructor(DOMString message);
+};
+
+[Exposed=(Window, DedicatedWorker), SecureContext]
+interface GPUOutOfMemoryError : GPUError {
+    constructor(DOMString message);
+};
+
+[Exposed=(Window, DedicatedWorker), SecureContext]
+interface GPUInternalError : GPUError {
+    constructor(DOMString message);
+};
+
+enum GPUErrorFilter {
+    "validation",
+    "out-of-memory",
+    "internal"
+};
+
+partial interface GPUDevice {
+    undefined pushErrorScope(GPUErrorFilter filter);
+    Promise<GPUError?> popErrorScope();
+};
+
+[Exposed=(Window, DedicatedWorker), SecureContext]
+interface GPUUncapturedErrorEvent : Event {
+    constructor(
+        DOMString type,
+        GPUUncapturedErrorEventInit gpuUncapturedErrorEventInitDict
+    );
+    [SameObject] readonly attribute GPUError error;
+};
+
+dictionary GPUUncapturedErrorEventInit : EventInit {
+    required GPUError error;
+};
+
+partial interface GPUDevice {
+    [Exposed=(Window, DedicatedWorker)]
+    attribute EventHandler onuncapturederror;
+};
+
+typedef [EnforceRange] unsigned long GPUBufferDynamicOffset;
+typedef [EnforceRange] unsigned long GPUStencilValue;
+typedef [EnforceRange] unsigned long GPUSampleMask;
+typedef [EnforceRange] long GPUDepthBias;
+
+typedef [EnforceRange] unsigned long long GPUSize64;
+typedef [EnforceRange] unsigned long GPUIntegerCoordinate;
+typedef [EnforceRange] unsigned long GPUIndex32;
+typedef [EnforceRange] unsigned long GPUSize32;
+typedef [EnforceRange] long GPUSignedOffset32;
+
+typedef unsigned long GPUFlagsConstant;
+
+dictionary GPUColorDict {
+    required double r;
+    required double g;
+    required double b;
+    required double a;
+};
+typedef (sequence<double> or GPUColorDict) GPUColor;
+
+dictionary GPUOrigin2DDict {
+    GPUIntegerCoordinate x = 0;
+    GPUIntegerCoordinate y = 0;
+};
+typedef (sequence<GPUIntegerCoordinate> or GPUOrigin2DDict) GPUOrigin2D;
+
+dictionary GPUOrigin3DDict {
+    GPUIntegerCoordinate x = 0;
+    GPUIntegerCoordinate y = 0;
+    GPUIntegerCoordinate z = 0;
+};
+typedef (sequence<GPUIntegerCoordinate> or GPUOrigin3DDict) GPUOrigin3D;
+
+dictionary GPUExtent3DDict {
+    required GPUIntegerCoordinate width;
+    GPUIntegerCoordinate height = 1;
+    GPUIntegerCoordinate depthOrArrayLayers = 1;
+};
+typedef (sequence<GPUIntegerCoordinate> or GPUExtent3DDict) GPUExtent3D;
diff --git a/test/wpt/tests/interfaces/webhid.idl b/test/wpt/tests/interfaces/webhid.idl
new file mode 100644
index 00000000000..a1a02d3e438
--- /dev/null
+++ b/test/wpt/tests/interfaces/webhid.idl
@@ -0,0 +1,127 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: WebHID API (https://wicg.github.io/webhid/)
+
+[SecureContext] partial interface Navigator {
+    [SameObject] readonly attribute HID hid;
+};
+
+[Exposed=ServiceWorker, SecureContext]
+partial interface WorkerNavigator {
+    [SameObject] readonly attribute HID hid;
+};
+
+[Exposed=(Window,ServiceWorker), SecureContext]
+interface HID : EventTarget {
+    attribute EventHandler onconnect;
+    attribute EventHandler ondisconnect;
+    Promise<sequence<HIDDevice>> getDevices();
+    Promise<sequence<HIDDevice>> requestDevice(
+        HIDDeviceRequestOptions options);
+};
+
+dictionary HIDDeviceRequestOptions {
+    required sequence<HIDDeviceFilter> filters;
+    sequence<HIDDeviceFilter> exclusionFilters;
+};
+
+dictionary HIDDeviceFilter {
+    unsigned long vendorId;
+    unsigned short productId;
+    unsigned short usagePage;
+    unsigned short usage;
+};
+
+[Exposed=Window, SecureContext]
+interface HIDDevice : EventTarget {
+    attribute EventHandler oninputreport;
+    readonly attribute boolean opened;
+    readonly attribute unsigned short vendorId;
+    readonly attribute unsigned short productId;
+    readonly attribute DOMString productName;
+    readonly attribute FrozenArray<HIDCollectionInfo> collections;
+    Promise<undefined> open();
+    Promise<undefined> close();
+    Promise<undefined> forget();
+    Promise<undefined> sendReport([EnforceRange] octet reportId, BufferSource data);
+    Promise<undefined> sendFeatureReport(
+        [EnforceRange] octet reportId,
+        BufferSource data);
+    Promise<DataView> receiveFeatureReport([EnforceRange] octet reportId);
+};
+
+[Exposed=Window, SecureContext]
+interface HIDConnectionEvent : Event {
+    constructor(DOMString type, HIDConnectionEventInit eventInitDict);
+    [SameObject] readonly attribute HIDDevice device;
+};
+
+dictionary HIDConnectionEventInit : EventInit {
+    required HIDDevice device;
+};
+
+[Exposed=Window, SecureContext]
+interface HIDInputReportEvent : Event {
+    constructor(DOMString type, HIDInputReportEventInit eventInitDict);
+    [SameObject] readonly attribute HIDDevice device;
+    readonly attribute octet reportId;
+    readonly attribute DataView data;
+};
+
+dictionary HIDInputReportEventInit : EventInit {
+    required HIDDevice device;
+    required octet reportId;
+    required DataView data;
+};
+
+dictionary HIDCollectionInfo {
+    unsigned short usagePage;
+    unsigned short usage;
+    octet type;
+    sequence<HIDCollectionInfo> children;
+    sequence<HIDReportInfo> inputReports;
+    sequence<HIDReportInfo> outputReports;
+    sequence<HIDReportInfo> featureReports;
+};
+
+dictionary HIDReportInfo {
+    octet reportId;
+    sequence<HIDReportItem> items;
+};
+
+dictionary HIDReportItem {
+    boolean isAbsolute;
+    boolean isArray;
+    boolean isBufferedBytes;
+    boolean isConstant;
+    boolean isLinear;
+    boolean isRange;
+    boolean isVolatile;
+    boolean hasNull;
+    boolean hasPreferredState;
+    boolean wrap;
+    sequence<unsigned long> usages;
+    unsigned long usageMinimum;
+    unsigned long usageMaximum;
+    unsigned short reportSize;
+    unsigned short reportCount;
+    byte unitExponent;
+    HIDUnitSystem unitSystem;
+    byte unitFactorLengthExponent;
+    byte unitFactorMassExponent;
+    byte unitFactorTimeExponent;
+    byte unitFactorTemperatureExponent;
+    byte unitFactorCurrentExponent;
+    byte unitFactorLuminousIntensityExponent;
+    long logicalMinimum;
+    long logicalMaximum;
+    long physicalMinimum;
+    long physicalMaximum;
+    sequence<DOMString> strings;
+};
+
+enum HIDUnitSystem {
+    "none", "si-linear", "si-rotation", "english-linear",
+    "english-rotation", "vendor-defined", "reserved"
+};
diff --git a/test/wpt/tests/interfaces/webidl.idl b/test/wpt/tests/interfaces/webidl.idl
new file mode 100644
index 00000000000..9993673361a
--- /dev/null
+++ b/test/wpt/tests/interfaces/webidl.idl
@@ -0,0 +1,50 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Web IDL Standard (https://webidl.spec.whatwg.org/)
+
+typedef (Int8Array or Int16Array or Int32Array or
+         Uint8Array or Uint16Array or Uint32Array or Uint8ClampedArray or
+         BigInt64Array or BigUint64Array or
+         Float32Array or Float64Array or DataView) ArrayBufferView;
+
+typedef (ArrayBufferView or ArrayBuffer) BufferSource;
+[Exposed=*,
+ Serializable]
+interface DOMException { // but see below note about ECMAScript binding
+  constructor(optional DOMString message = "", optional DOMString name = "Error");
+  readonly attribute DOMString name;
+  readonly attribute DOMString message;
+  readonly attribute unsigned short code;
+
+  const unsigned short INDEX_SIZE_ERR = 1;
+  const unsigned short DOMSTRING_SIZE_ERR = 2;
+  const unsigned short HIERARCHY_REQUEST_ERR = 3;
+  const unsigned short WRONG_DOCUMENT_ERR = 4;
+  const unsigned short INVALID_CHARACTER_ERR = 5;
+  const unsigned short NO_DATA_ALLOWED_ERR = 6;
+  const unsigned short NO_MODIFICATION_ALLOWED_ERR = 7;
+  const unsigned short NOT_FOUND_ERR = 8;
+  const unsigned short NOT_SUPPORTED_ERR = 9;
+  const unsigned short INUSE_ATTRIBUTE_ERR = 10;
+  const unsigned short INVALID_STATE_ERR = 11;
+  const unsigned short SYNTAX_ERR = 12;
+  const unsigned short INVALID_MODIFICATION_ERR = 13;
+  const unsigned short NAMESPACE_ERR = 14;
+  const unsigned short INVALID_ACCESS_ERR = 15;
+  const unsigned short VALIDATION_ERR = 16;
+  const unsigned short TYPE_MISMATCH_ERR = 17;
+  const unsigned short SECURITY_ERR = 18;
+  const unsigned short NETWORK_ERR = 19;
+  const unsigned short ABORT_ERR = 20;
+  const unsigned short URL_MISMATCH_ERR = 21;
+  const unsigned short QUOTA_EXCEEDED_ERR = 22;
+  const unsigned short TIMEOUT_ERR = 23;
+  const unsigned short INVALID_NODE_TYPE_ERR = 24;
+  const unsigned short DATA_CLONE_ERR = 25;
+};
+
+callback Function = any (any... arguments);
+callback VoidFunction = undefined ();
+
+typedef unsigned long long DOMTimeStamp;
diff --git a/test/wpt/tests/interfaces/webmidi.idl b/test/wpt/tests/interfaces/webmidi.idl
new file mode 100644
index 00000000000..1acf1ac1d4c
--- /dev/null
+++ b/test/wpt/tests/interfaces/webmidi.idl
@@ -0,0 +1,91 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Web MIDI API (https://webaudio.github.io/web-midi-api/)
+
+dictionary MidiPermissionDescriptor : PermissionDescriptor {
+  boolean sysex = false;
+};
+
+partial interface Navigator {
+  [SecureContext]
+  Promise <MIDIAccess> requestMIDIAccess(optional MIDIOptions options = {});
+};
+
+dictionary MIDIOptions {
+  boolean sysex;
+  boolean software;
+};
+
+[SecureContext, Exposed=Window] interface MIDIInputMap {
+  readonly maplike <DOMString, MIDIInput>;
+};
+
+[SecureContext, Exposed=Window] interface MIDIOutputMap {
+  readonly maplike <DOMString, MIDIOutput>;
+};
+
+[SecureContext, Exposed=Window] interface MIDIAccess: EventTarget {
+  readonly attribute MIDIInputMap inputs;
+  readonly attribute MIDIOutputMap outputs;
+  attribute EventHandler onstatechange;
+  readonly attribute boolean sysexEnabled;
+};
+
+[SecureContext, Exposed=Window] interface MIDIPort: EventTarget {
+  readonly attribute DOMString id;
+  readonly attribute DOMString? manufacturer;
+  readonly attribute DOMString? name;
+  readonly attribute MIDIPortType type;
+  readonly attribute DOMString? version;
+  readonly attribute MIDIPortDeviceState state;
+  readonly attribute MIDIPortConnectionState connection;
+  attribute EventHandler onstatechange;
+  Promise <MIDIPort> open();
+  Promise <MIDIPort> close();
+};
+
+[SecureContext, Exposed=Window] interface MIDIInput: MIDIPort {
+  attribute EventHandler onmidimessage;
+};
+
+[SecureContext, Exposed=Window] interface MIDIOutput : MIDIPort {
+  undefined send(sequence<octet> data, optional DOMHighResTimeStamp timestamp = 0);
+  undefined clear();
+};
+
+enum MIDIPortType {
+  "input",
+  "output",
+};
+
+enum MIDIPortDeviceState {
+  "disconnected",
+  "connected",
+};
+
+enum MIDIPortConnectionState {
+  "open",
+  "closed",
+  "pending",
+};
+
+[SecureContext, Exposed=Window]
+interface MIDIMessageEvent : Event {
+  constructor(DOMString type, optional MIDIMessageEventInit eventInitDict = {});
+  readonly attribute Uint8Array data;
+};
+
+dictionary MIDIMessageEventInit: EventInit {
+  Uint8Array data;
+};
+
+[SecureContext, Exposed=Window]
+interface MIDIConnectionEvent : Event {
+  constructor(DOMString type, optional MIDIConnectionEventInit eventInitDict = {});
+  readonly attribute MIDIPort port;
+};
+
+dictionary MIDIConnectionEventInit: EventInit {
+  MIDIPort port;
+};
diff --git a/test/wpt/tests/interfaces/webnn.idl b/test/wpt/tests/interfaces/webnn.idl
new file mode 100644
index 00000000000..820c79e9666
--- /dev/null
+++ b/test/wpt/tests/interfaces/webnn.idl
@@ -0,0 +1,542 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Web Neural Network API (https://webmachinelearning.github.io/webnn/)
+
+interface mixin NavigatorML {
+  [SecureContext, SameObject] readonly attribute ML ml;
+};
+Navigator includes NavigatorML;
+WorkerNavigator includes NavigatorML;
+
+enum MLDeviceType {
+  "cpu",
+  "gpu"
+};
+
+enum MLPowerPreference {
+  "default",
+  "high-performance",
+  "low-power"
+};
+
+dictionary MLContextOptions {
+  MLDeviceType deviceType = "cpu";
+  MLPowerPreference powerPreference = "default";
+};
+
+[SecureContext, Exposed=(Window, DedicatedWorker)]
+interface ML {
+  Promise<MLContext> createContext(optional MLContextOptions options = {});
+  Promise<MLContext> createContext(GPUDevice gpuDevice);
+
+  [Exposed=(DedicatedWorker)]
+  MLContext createContextSync(optional MLContextOptions options = {});
+  [Exposed=(DedicatedWorker)]
+  MLContext createContextSync(GPUDevice gpuDevice);
+};
+
+[SecureContext, Exposed=(Window, DedicatedWorker)]
+interface MLGraph {};
+
+enum MLInputOperandLayout {
+  "nchw",
+  "nhwc"
+};
+
+enum MLOperandType {
+  "float32",
+  "float16",
+  "int32",
+  "uint32",
+  "int8",
+  "uint8"
+};
+
+dictionary MLOperandDescriptor {
+  // The operand type.
+  required MLOperandType type;
+
+  // The dimensions field is only required for tensor operands.
+  sequence<unsigned long> dimensions;
+};
+
+[SecureContext, Exposed=(Window, DedicatedWorker)]
+interface MLOperand {};
+
+[SecureContext, Exposed=(Window, DedicatedWorker)]
+interface MLActivation {};
+
+typedef record<DOMString, ArrayBufferView> MLNamedArrayBufferViews;
+
+[SecureContext, Exposed=(Window, DedicatedWorker)]
+interface MLContext {};
+
+partial interface MLContext {
+  [Exposed=(DedicatedWorker)]
+  undefined computeSync(
+      MLGraph graph, MLNamedArrayBufferViews inputs, MLNamedArrayBufferViews outputs);
+};
+
+dictionary MLComputeResult {
+  MLNamedArrayBufferViews inputs;
+  MLNamedArrayBufferViews outputs;
+};
+
+partial interface MLContext {
+  Promise<MLComputeResult> compute(
+      MLGraph graph, MLNamedArrayBufferViews inputs, MLNamedArrayBufferViews outputs);
+};
+
+partial interface MLContext {
+  MLCommandEncoder createCommandEncoder();
+};
+
+typedef (GPUBuffer or GPUTexture) MLGPUResource;
+
+typedef record<DOMString, MLGPUResource> MLNamedGPUResources;
+
+[SecureContext, Exposed=(Window, DedicatedWorker)]
+interface MLCommandEncoder {};
+
+partial interface MLCommandEncoder {
+  undefined initializeGraph(MLGraph graph);
+};
+
+partial interface MLCommandEncoder {
+  undefined dispatch(MLGraph graph, MLNamedGPUResources inputs, MLNamedGPUResources outputs);
+};
+
+partial interface MLCommandEncoder {
+  GPUCommandBuffer finish(optional GPUCommandBufferDescriptor descriptor = {});
+};
+
+typedef record<DOMString, MLOperand> MLNamedOperands;
+
+dictionary MLBufferResourceView {
+  required GPUBuffer resource;
+  unsigned long long offset = 0;
+  unsigned long long size;
+};
+
+typedef (ArrayBufferView or MLBufferResourceView) MLBufferView;
+
+[SecureContext, Exposed=(Window, DedicatedWorker)]
+interface MLGraphBuilder {
+  // Construct the graph builder from the context.
+  constructor(MLContext context);
+
+  // Create an operand for a graph input.
+  MLOperand input(DOMString name, MLOperandDescriptor desc);
+
+  // Create an operand for a graph constant.
+  MLOperand constant(MLOperandDescriptor desc, MLBufferView bufferView);
+
+  // Create a single-value operand from the specified number of the specified type.
+  MLOperand constant(double value, optional MLOperandType type = "float32");
+
+  // Compile the graph up to the specified output operands asynchronously.
+  Promise<MLGraph> build(MLNamedOperands outputs);
+
+  // Compile the graph up to the specified output operands synchronously.
+  [Exposed=(DedicatedWorker)]
+  MLGraph buildSync(MLNamedOperands outputs);
+};
+
+dictionary MLBatchNormalizationOptions {
+  MLOperand scale;
+  MLOperand bias;
+  long axis = 1;
+  float epsilon = 1e-5;
+  MLActivation activation;
+};
+
+partial interface MLGraphBuilder {
+  MLOperand batchNormalization(MLOperand input, MLOperand mean, MLOperand variance,
+                             optional MLBatchNormalizationOptions options = {});
+};
+
+dictionary MLClampOptions {
+  float minValue;
+  float maxValue;
+};
+
+partial interface MLGraphBuilder {
+  MLOperand clamp(MLOperand x, optional MLClampOptions options = {});
+  MLActivation clamp(optional MLClampOptions options = {});
+};
+
+partial interface MLGraphBuilder {
+  MLOperand concat(sequence<MLOperand> inputs, long axis);
+};
+
+enum MLConv2dFilterOperandLayout {
+  "oihw",
+  "hwio",
+  "ohwi",
+  "ihwo"
+};
+
+enum MLAutoPad {
+  "explicit",
+  "same-upper",
+  "same-lower"
+};
+
+dictionary MLConv2dOptions {
+  sequence<unsigned long> padding;
+  sequence<unsigned long> strides;
+  sequence<unsigned long> dilations;
+  MLAutoPad autoPad = "explicit";
+  unsigned long groups = 1;
+  MLInputOperandLayout inputLayout = "nchw";
+  MLConv2dFilterOperandLayout filterLayout = "oihw";
+  MLOperand bias;
+  MLActivation activation;
+};
+
+partial interface MLGraphBuilder {
+  MLOperand conv2d(MLOperand input, MLOperand filter, optional MLConv2dOptions options = {});
+};
+
+enum MLConvTranspose2dFilterOperandLayout {
+  "iohw",
+  "hwoi",
+  "ohwi"
+};
+
+dictionary MLConvTranspose2dOptions {
+  sequence<unsigned long> padding;
+  sequence<unsigned long> strides;
+  sequence<unsigned long> dilations;
+  sequence<unsigned long> outputPadding;
+  sequence<unsigned long> outputSizes;
+  MLAutoPad autoPad = "explicit";
+  unsigned long groups = 1;
+  MLInputOperandLayout inputLayout = "nchw";
+  MLConvTranspose2dFilterOperandLayout filterLayout = "iohw";
+  MLOperand bias;
+  MLActivation activation;
+};
+
+partial interface MLGraphBuilder {
+  MLOperand convTranspose2d(MLOperand input, MLOperand filter,
+                            optional MLConvTranspose2dOptions options = {});
+};
+
+partial interface MLGraphBuilder {
+  MLOperand add(MLOperand a, MLOperand b);
+  MLOperand sub(MLOperand a, MLOperand b);
+  MLOperand mul(MLOperand a, MLOperand b);
+  MLOperand div(MLOperand a, MLOperand b);
+  MLOperand max(MLOperand a, MLOperand b);
+  MLOperand min(MLOperand a, MLOperand b);
+  MLOperand pow(MLOperand a, MLOperand b);
+};
+
+partial interface MLGraphBuilder {
+  MLOperand abs(MLOperand x);
+  MLOperand ceil(MLOperand x);
+  MLOperand cos(MLOperand x);
+  MLOperand exp(MLOperand x);
+  MLOperand floor(MLOperand x);
+  MLOperand log(MLOperand x);
+  MLOperand neg(MLOperand x);
+  MLOperand sin(MLOperand x);
+  MLOperand tan(MLOperand x);
+};
+
+dictionary MLEluOptions {
+  float alpha = 1;
+};
+
+partial interface MLGraphBuilder {
+  MLOperand elu(MLOperand x, optional MLEluOptions options = {});
+  MLActivation elu(optional MLEluOptions options = {});
+};
+
+dictionary MLGemmOptions {
+  MLOperand c;
+  float alpha = 1.0;
+  float beta = 1.0;
+  boolean aTranspose = false;
+  boolean bTranspose = false;
+};
+
+partial interface MLGraphBuilder {
+  MLOperand gemm(MLOperand a, MLOperand b, optional MLGemmOptions options = {});
+};
+
+enum MLGruWeightLayout {
+  "zrn",  // update-reset-new gate ordering
+  "rzn"   // reset-update-new gate ordering
+};
+
+enum MLRecurrentNetworkDirection {
+  "forward",
+  "backward",
+  "both"
+};
+
+dictionary MLGruOptions {
+  MLOperand bias;
+  MLOperand recurrentBias;
+  MLOperand initialHiddenState;
+  boolean resetAfter = true;
+  boolean returnSequence = false;
+  MLRecurrentNetworkDirection direction = "forward";
+  MLGruWeightLayout layout = "zrn";
+  sequence<MLActivation> activations;
+};
+
+partial interface MLGraphBuilder {
+  sequence<MLOperand> gru(MLOperand input, MLOperand weight, MLOperand recurrentWeight,
+                          unsigned long steps, unsigned long hiddenSize,
+                          optional MLGruOptions options = {});
+};
+
+dictionary MLGruCellOptions {
+  MLOperand bias;
+  MLOperand recurrentBias;
+  boolean resetAfter = true;
+  MLGruWeightLayout layout = "zrn";
+  sequence<MLActivation> activations;
+};
+
+partial interface MLGraphBuilder {
+  MLOperand gruCell(MLOperand input, MLOperand weight, MLOperand recurrentWeight,
+                    MLOperand hiddenState, unsigned long hiddenSize,
+                    optional MLGruCellOptions options = {});
+};
+
+dictionary MLHardSigmoidOptions {
+  float alpha = 0.2;
+  float beta = 0.5;
+};
+
+partial interface MLGraphBuilder {
+  MLOperand hardSigmoid(MLOperand x, optional MLHardSigmoidOptions options = {});
+  MLActivation hardSigmoid(optional MLHardSigmoidOptions options = {});
+};
+
+partial interface MLGraphBuilder {
+  MLOperand hardSwish(MLOperand x);
+  MLActivation hardSwish();
+};
+
+dictionary MLInstanceNormalizationOptions {
+  MLOperand scale;
+  MLOperand bias;
+  float epsilon = 1e-5;
+  MLInputOperandLayout layout = "nchw";
+};
+
+partial interface MLGraphBuilder {
+  MLOperand instanceNormalization(MLOperand input,
+                                optional MLInstanceNormalizationOptions options = {});
+};
+
+dictionary MLLeakyReluOptions {
+  float alpha = 0.01;
+};
+
+partial interface MLGraphBuilder {
+  MLOperand leakyRelu(MLOperand x, optional MLLeakyReluOptions options = {});
+  MLActivation leakyRelu(optional MLLeakyReluOptions options = {});
+};
+
+dictionary MLLinearOptions {
+  float alpha = 1;
+  float beta = 0;
+};
+
+partial interface MLGraphBuilder {
+  MLOperand linear(MLOperand x, optional MLLinearOptions options = {});
+  MLActivation linear(optional MLLinearOptions options = {});
+};
+
+enum MLLstmWeightLayout {
+  "iofg", // input-output-forget-cell gate ordering
+  "ifgo"  // input-forget-cell-output gate ordering
+};
+
+dictionary MLLstmOptions {
+  MLOperand bias;
+  MLOperand recurrentBias;
+  MLOperand peepholeWeight;
+  MLOperand initialHiddenState;
+  MLOperand initialCellState;
+  boolean returnSequence = false;
+  MLRecurrentNetworkDirection direction = "forward";
+  MLLstmWeightLayout layout = "iofg";
+  sequence<MLActivation> activations;
+};
+
+partial interface MLGraphBuilder {
+  sequence<MLOperand> lstm(MLOperand input, MLOperand weight, MLOperand recurrentWeight,
+                           unsigned long steps, unsigned long hiddenSize,
+                           optional MLLstmOptions options = {});
+};
+
+dictionary MLLstmCellOptions {
+  MLOperand bias;
+  MLOperand recurrentBias;
+  MLOperand peepholeWeight;
+  MLLstmWeightLayout layout = "iofg";
+  sequence<MLActivation> activations;
+};
+
+partial interface MLGraphBuilder {
+  sequence<MLOperand> lstmCell(MLOperand input, MLOperand weight, MLOperand recurrentWeight,
+                               MLOperand hiddenState, MLOperand cellState, unsigned long hiddenSize,
+                               optional MLLstmCellOptions options = {});
+};
+
+partial interface MLGraphBuilder {
+  MLOperand matmul(MLOperand a, MLOperand b);
+};
+
+enum MLPaddingMode {
+  "constant",
+  "edge",
+  "reflection",
+  "symmetric"
+};
+
+dictionary MLPadOptions {
+  MLPaddingMode mode = "constant";
+  float value = 0;
+};
+
+partial interface MLGraphBuilder {
+  MLOperand pad(MLOperand input, MLOperand padding, optional MLPadOptions options = {});
+};
+
+enum MLRoundingType {
+  "floor",
+  "ceil"
+};
+
+dictionary MLPool2dOptions {
+  sequence<unsigned long> windowDimensions;
+  sequence<unsigned long> padding;
+  sequence<unsigned long> strides;
+  sequence<unsigned long> dilations;
+  MLAutoPad autoPad = "explicit";
+  MLInputOperandLayout layout = "nchw";
+  MLRoundingType roundingType = "floor";
+  sequence<unsigned long> outputSizes;
+};
+
+partial interface MLGraphBuilder {
+  MLOperand averagePool2d(MLOperand input, optional MLPool2dOptions options = {});
+  MLOperand l2Pool2d(MLOperand input, optional MLPool2dOptions options = {});
+  MLOperand maxPool2d(MLOperand input, optional MLPool2dOptions options = {});
+};
+
+dictionary MLReduceOptions {
+  sequence<long> axes = null;
+  boolean keepDimensions = false;
+};
+
+partial interface MLGraphBuilder {
+  MLOperand reduceL1(MLOperand input, optional MLReduceOptions options = {});
+  MLOperand reduceL2(MLOperand input, optional MLReduceOptions options = {});
+  MLOperand reduceLogSum(MLOperand input, optional MLReduceOptions options = {});
+  MLOperand reduceLogSumExp(MLOperand input, optional MLReduceOptions options = {});
+  MLOperand reduceMax(MLOperand input, optional MLReduceOptions options = {});
+  MLOperand reduceMean(MLOperand input, optional MLReduceOptions options = {});
+  MLOperand reduceMin(MLOperand input, optional MLReduceOptions options = {});
+  MLOperand reduceProduct(MLOperand input, optional MLReduceOptions options = {});
+  MLOperand reduceSum(MLOperand input, optional MLReduceOptions options = {});
+  MLOperand reduceSumSquare(MLOperand input, optional MLReduceOptions options = {});
+};
+
+partial interface MLGraphBuilder {
+  MLOperand relu(MLOperand x);
+  MLActivation relu();
+};
+
+enum MLInterpolationMode {
+  "nearest-neighbor",
+  "linear"
+};
+
+dictionary MLResample2dOptions {
+  MLInterpolationMode mode = "nearest-neighbor";
+  sequence<float> scales;
+  sequence<unsigned long> sizes;
+  sequence<long> axes;
+};
+
+partial interface MLGraphBuilder {
+  MLOperand resample2d(MLOperand input, optional MLResample2dOptions options = {});
+};
+
+partial interface MLGraphBuilder {
+  MLOperand reshape(MLOperand input, sequence<unsigned long?> newShape);
+};
+
+partial interface MLGraphBuilder {
+  MLOperand sigmoid(MLOperand x);
+  MLActivation sigmoid();
+};
+
+dictionary MLSliceOptions {
+  sequence<long> axes;
+};
+
+partial interface MLGraphBuilder {
+  MLOperand slice(MLOperand input, sequence<long> starts, sequence<long> sizes,
+                optional MLSliceOptions options = {});
+};
+
+partial interface MLGraphBuilder {
+  MLOperand softmax(MLOperand x);
+  MLActivation softmax();
+};
+
+dictionary MLSoftplusOptions {
+  float steepness = 1;
+};
+
+partial interface MLGraphBuilder {
+  MLOperand softplus(MLOperand x, optional MLSoftplusOptions options = {});
+  MLActivation softplus(optional MLSoftplusOptions options = {});
+};
+
+partial interface MLGraphBuilder {
+  MLOperand softsign(MLOperand x);
+  MLActivation softsign();
+};
+
+dictionary MLSplitOptions {
+  long axis = 0;
+};
+
+partial interface MLGraphBuilder {
+  sequence<MLOperand> split(MLOperand input,
+                          (unsigned long or sequence<unsigned long>) splits,
+                          optional MLSplitOptions options = {});
+};
+
+dictionary MLSqueezeOptions {
+  sequence<long> axes;
+};
+
+partial interface MLGraphBuilder {
+  MLOperand squeeze(MLOperand input, optional MLSqueezeOptions options = {});
+};
+
+partial interface MLGraphBuilder {
+  MLOperand tanh(MLOperand x);
+  MLActivation tanh();
+};
+
+dictionary MLTransposeOptions {
+  sequence<long> permutation;
+};
+
+partial interface MLGraphBuilder {
+  MLOperand transpose(MLOperand input, optional MLTransposeOptions options = {});
+};
diff --git a/test/wpt/tests/interfaces/webrtc-encoded-transform.idl b/test/wpt/tests/interfaces/webrtc-encoded-transform.idl
new file mode 100644
index 00000000000..13f3999db12
--- /dev/null
+++ b/test/wpt/tests/interfaces/webrtc-encoded-transform.idl
@@ -0,0 +1,126 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: WebRTC Encoded Transform (https://w3c.github.io/webrtc-encoded-transform/)
+
+typedef (SFrameTransform or RTCRtpScriptTransform) RTCRtpTransform;
+
+// New methods for RTCRtpSender and RTCRtpReceiver
+partial interface RTCRtpSender {
+    attribute RTCRtpTransform? transform;
+};
+
+partial interface RTCRtpReceiver {
+    attribute RTCRtpTransform? transform;
+};
+
+enum SFrameTransformRole {
+    "encrypt",
+    "decrypt"
+};
+
+dictionary SFrameTransformOptions {
+    SFrameTransformRole role = "encrypt";
+};
+
+typedef [EnforceRange] unsigned long long SmallCryptoKeyID;
+typedef (SmallCryptoKeyID or bigint) CryptoKeyID;
+
+[Exposed=(Window,DedicatedWorker)]
+interface SFrameTransform {
+    constructor(optional SFrameTransformOptions options = {});
+    Promise<undefined> setEncryptionKey(CryptoKey key, optional CryptoKeyID keyID);
+    attribute EventHandler onerror;
+};
+SFrameTransform includes GenericTransformStream;
+
+enum SFrameTransformErrorEventType {
+    "authentication",
+    "keyID",
+    "syntax"
+};
+
+[Exposed=(Window,DedicatedWorker)]
+interface SFrameTransformErrorEvent : Event {
+    constructor(DOMString type, SFrameTransformErrorEventInit eventInitDict);
+
+    readonly attribute SFrameTransformErrorEventType errorType;
+    readonly attribute CryptoKeyID? keyID;
+    readonly attribute any frame;
+};
+
+dictionary SFrameTransformErrorEventInit : EventInit {
+    required SFrameTransformErrorEventType errorType;
+    required any frame;
+    CryptoKeyID? keyID;
+};
+
+// New enum for video frame types. Will eventually re-use the equivalent defined
+// by WebCodecs.
+enum RTCEncodedVideoFrameType {
+    "empty",
+    "key",
+    "delta",
+};
+
+dictionary RTCEncodedVideoFrameMetadata {
+    unsigned long long frameId;
+    sequence<unsigned long long> dependencies;
+    unsigned short width;
+    unsigned short height;
+    unsigned long spatialIndex;
+    unsigned long temporalIndex;
+    unsigned long synchronizationSource;
+    octet payloadType;
+  sequence<unsigned long> contributingSources;
+};
+
+// New interfaces to define encoded video and audio frames. Will eventually
+// re-use or extend the equivalent defined in WebCodecs.
+[Exposed=(Window,DedicatedWorker)]
+interface RTCEncodedVideoFrame {
+    readonly attribute RTCEncodedVideoFrameType type;
+    readonly attribute unsigned long timestamp;
+    attribute ArrayBuffer data;
+    RTCEncodedVideoFrameMetadata getMetadata();
+};
+
+dictionary RTCEncodedAudioFrameMetadata {
+    unsigned long synchronizationSource;
+    octet payloadType;
+    sequence<unsigned long> contributingSources;
+};
+
+[Exposed=(Window,DedicatedWorker)]
+interface RTCEncodedAudioFrame {
+    readonly attribute unsigned long timestamp;
+    attribute ArrayBuffer data;
+    RTCEncodedAudioFrameMetadata getMetadata();
+};
+
+[Exposed=DedicatedWorker]
+interface RTCTransformEvent : Event {
+    readonly attribute RTCRtpScriptTransformer transformer;
+};
+
+partial interface DedicatedWorkerGlobalScope {
+    attribute EventHandler onrtctransform;
+};
+
+[Exposed=DedicatedWorker]
+interface RTCRtpScriptTransformer {
+    readonly attribute ReadableStream readable;
+    readonly attribute WritableStream writable;
+    readonly attribute any options;
+    Promise<unsigned long long> generateKeyFrame(optional DOMString rid);
+    Promise<undefined> sendKeyFrameRequest();
+};
+
+[Exposed=Window]
+interface RTCRtpScriptTransform {
+    constructor(Worker worker, optional any options, optional sequence<object> transfer);
+};
+
+partial interface RTCRtpSender {
+    Promise<undefined> generateKeyFrame(optional sequence <DOMString> rids);
+};
diff --git a/test/wpt/tests/interfaces/webrtc-ice.idl b/test/wpt/tests/interfaces/webrtc-ice.idl
new file mode 100644
index 00000000000..58f88bade42
--- /dev/null
+++ b/test/wpt/tests/interfaces/webrtc-ice.idl
@@ -0,0 +1,24 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: IceTransport Extensions for WebRTC (https://w3c.github.io/webrtc-ice/)
+
+partial dictionary RTCIceParameters {
+             boolean   iceLite;
+};
+
+dictionary RTCIceGatherOptions {
+             RTCIceTransportPolicy     gatherPolicy = "all";
+             sequence<RTCIceServer> iceServers;
+};
+
+[Exposed=Window]
+partial interface RTCIceTransport {
+    constructor();
+    undefined                      gather (optional RTCIceGatherOptions options = {});
+    undefined                      start (optional RTCIceParameters remoteParameters = {}, optional RTCIceRole role = "controlled");
+    undefined                      stop ();
+    undefined                      addRemoteCandidate (optional RTCIceCandidateInit remoteCandidate = {});
+                    attribute EventHandler        onerror;
+                    attribute EventHandler        onicecandidate;
+};
diff --git a/test/wpt/tests/interfaces/webrtc-identity.idl b/test/wpt/tests/interfaces/webrtc-identity.idl
new file mode 100644
index 00000000000..108c3ad9b11
--- /dev/null
+++ b/test/wpt/tests/interfaces/webrtc-identity.idl
@@ -0,0 +1,97 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Identity for WebRTC 1.0 (https://w3c.github.io/webrtc-identity/)
+
+[Global=(Worker,RTCIdentityProvider), Exposed=RTCIdentityProvider]
+interface RTCIdentityProviderGlobalScope : WorkerGlobalScope {
+    readonly        attribute RTCIdentityProviderRegistrar rtcIdentityProvider;
+};
+
+[Exposed=RTCIdentityProvider]
+interface RTCIdentityProviderRegistrar {
+    undefined register (RTCIdentityProvider idp);
+};
+
+dictionary RTCIdentityProvider {
+    required GenerateAssertionCallback generateAssertion;
+    required ValidateAssertionCallback validateAssertion;
+};
+
+callback GenerateAssertionCallback = Promise<RTCIdentityAssertionResult>
+(DOMString contents, DOMString origin, RTCIdentityProviderOptions options);
+
+callback ValidateAssertionCallback = Promise<RTCIdentityValidationResult>
+(DOMString assertion, DOMString origin);
+
+dictionary RTCIdentityAssertionResult {
+    required RTCIdentityProviderDetails idp;
+    required DOMString                  assertion;
+};
+
+dictionary RTCIdentityProviderDetails {
+    required DOMString domain;
+             DOMString protocol = "default";
+};
+
+dictionary RTCIdentityValidationResult {
+    required DOMString identity;
+    required DOMString contents;
+};
+
+partial interface RTCPeerConnection {
+    undefined               setIdentityProvider (DOMString provider, optional RTCIdentityProviderOptions options = {});
+    Promise<DOMString> getIdentityAssertion ();
+    readonly        attribute Promise<RTCIdentityAssertion> peerIdentity;
+    readonly        attribute DOMString?                    idpLoginUrl;
+    readonly        attribute DOMString?                    idpErrorInfo;
+};
+
+partial dictionary RTCConfiguration {
+  DOMString peerIdentity;
+};
+
+dictionary RTCIdentityProviderOptions {
+    DOMString protocol = "default";
+    DOMString usernameHint;
+    DOMString peerIdentity;
+};
+
+[Exposed=Window]
+interface RTCIdentityAssertion {
+    constructor(DOMString idp, DOMString name);
+    attribute DOMString idp;
+    attribute DOMString name;
+};
+
+partial interface RTCError {
+  readonly attribute long? httpRequestStatusCode;
+};
+
+partial dictionary RTCErrorInit {
+  long httpRequestStatusCode;
+};
+
+// This is an extension of RTCErrorDetailType from [[WEBRTC-PC]]
+// Unfortunately, WebIDL does not support partial enums (yet).
+//
+// partial enum RTCErrorDetailType {
+enum RTCErrorDetailTypeIdp {
+  "idp-bad-script-failure",
+  "idp-execution-failure",
+  "idp-load-failure",
+  "idp-need-login",
+  "idp-timeout",
+  "idp-tls-failure",
+  "idp-token-expired",
+  "idp-token-invalid",
+};
+
+partial dictionary MediaStreamConstraints {
+             DOMString peerIdentity;
+};
+
+partial interface MediaStreamTrack {
+    readonly        attribute boolean      isolated;
+                    attribute EventHandler onisolationchange;
+};
diff --git a/test/wpt/tests/interfaces/webrtc-priority.idl b/test/wpt/tests/interfaces/webrtc-priority.idl
new file mode 100644
index 00000000000..a76952b9b0a
--- /dev/null
+++ b/test/wpt/tests/interfaces/webrtc-priority.idl
@@ -0,0 +1,24 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: WebRTC Priority Control API (https://w3c.github.io/webrtc-priority/)
+
+enum RTCPriorityType {
+  "very-low",
+  "low",
+  "medium",
+  "high"
+};
+
+partial dictionary RTCRtpEncodingParameters {
+  RTCPriorityType priority = "low";
+  RTCPriorityType networkPriority;
+};
+
+partial interface RTCDataChannel {
+  readonly attribute RTCPriorityType priority;
+};
+
+partial dictionary RTCDataChannelInit {
+  RTCPriorityType priority = "low";
+};
diff --git a/test/wpt/tests/interfaces/webrtc-stats.idl b/test/wpt/tests/interfaces/webrtc-stats.idl
new file mode 100644
index 00000000000..f1dca4a923d
--- /dev/null
+++ b/test/wpt/tests/interfaces/webrtc-stats.idl
@@ -0,0 +1,288 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Identifiers for WebRTC's Statistics API (https://w3c.github.io/webrtc-stats/)
+
+enum RTCStatsType {
+"codec",
+"inbound-rtp",
+"outbound-rtp",
+"remote-inbound-rtp",
+"remote-outbound-rtp",
+"media-source",
+"media-playout",
+"peer-connection",
+"data-channel",
+"stream",
+"track",
+"transport",
+"candidate-pair",
+"local-candidate",
+"remote-candidate",
+"certificate"
+};
+
+dictionary RTCRtpStreamStats : RTCStats {
+             required unsigned long       ssrc;
+             required DOMString           kind;
+             DOMString           transportId;
+             DOMString           codecId;
+};
+
+dictionary RTCCodecStats : RTCStats {
+             required unsigned long payloadType;
+             required DOMString     transportId;
+             required DOMString     mimeType;
+             unsigned long clockRate;
+             unsigned long channels;
+             DOMString     sdpFmtpLine;
+};
+
+dictionary RTCReceivedRtpStreamStats : RTCRtpStreamStats {
+             unsigned long long   packetsReceived;
+             long long            packetsLost;
+             double               jitter;
+};
+
+dictionary RTCInboundRtpStreamStats : RTCReceivedRtpStreamStats {
+ required DOMString   trackIdentifier;
+ required DOMString   kind;
+ DOMString            mid;
+ DOMString            remoteId;
+ unsigned long        framesDecoded;
+ unsigned long        keyFramesDecoded;
+ unsigned long        framesRendered;
+ unsigned long        framesDropped;
+ unsigned long        frameWidth;
+ unsigned long        frameHeight;
+ double               framesPerSecond;
+ unsigned long long   qpSum;
+ double               totalDecodeTime;
+ double               totalInterFrameDelay;
+ double               totalSquaredInterFrameDelay;
+ unsigned long        pauseCount;
+ double               totalPausesDuration;
+ unsigned long        freezeCount;
+ double               totalFreezesDuration;
+ DOMHighResTimeStamp  lastPacketReceivedTimestamp;
+ unsigned long long   headerBytesReceived;
+ unsigned long long   packetsDiscarded;
+ unsigned long long   fecPacketsReceived;
+ unsigned long long   fecPacketsDiscarded;
+ unsigned long long   bytesReceived;
+ unsigned long        nackCount;
+ unsigned long        firCount;
+ unsigned long        pliCount;
+ double               totalProcessingDelay;
+ DOMHighResTimeStamp  estimatedPlayoutTimestamp;
+ double               jitterBufferDelay;
+ double               jitterBufferTargetDelay;
+ unsigned long long   jitterBufferEmittedCount;
+ double               jitterBufferMinimumDelay;
+ unsigned long long   totalSamplesReceived;
+ unsigned long long   concealedSamples;
+ unsigned long long   silentConcealedSamples;
+ unsigned long long   concealmentEvents;
+ unsigned long long   insertedSamplesForDeceleration;
+ unsigned long long   removedSamplesForAcceleration;
+ double               audioLevel;
+ double               totalAudioEnergy;
+ double               totalSamplesDuration;
+ unsigned long        framesReceived;
+ DOMString            decoderImplementation;
+ DOMString            playoutId;
+ boolean              powerEfficientDecoder;
+ unsigned long        framesAssembledFromMultiplePackets;
+ double               totalAssemblyTime;
+};
+
+dictionary RTCRemoteInboundRtpStreamStats : RTCReceivedRtpStreamStats {
+             DOMString            localId;
+             double               roundTripTime;
+             double               totalRoundTripTime;
+             double               fractionLost;
+             unsigned long long   roundTripTimeMeasurements;
+};
+
+dictionary RTCSentRtpStreamStats : RTCRtpStreamStats {
+             unsigned long      packetsSent;
+             unsigned long long bytesSent;
+};
+
+dictionary RTCOutboundRtpStreamStats : RTCSentRtpStreamStats {
+             DOMString            mid;
+             DOMString            mediaSourceId;
+             DOMString            remoteId;
+             DOMString            rid;
+             unsigned long long   headerBytesSent;
+             unsigned long long   retransmittedPacketsSent;
+             unsigned long long   retransmittedBytesSent;
+             double               targetBitrate;
+             unsigned long long   totalEncodedBytesTarget;
+             unsigned long        frameWidth;
+             unsigned long        frameHeight;
+             double               framesPerSecond;
+             unsigned long        framesSent;
+             unsigned long        hugeFramesSent;
+             unsigned long        framesEncoded;
+             unsigned long        keyFramesEncoded;
+             unsigned long long   qpSum;
+             double               totalEncodeTime;
+             double               totalPacketSendDelay;
+             RTCQualityLimitationReason                 qualityLimitationReason;
+             record<DOMString, double> qualityLimitationDurations;
+             unsigned long        qualityLimitationResolutionChanges;
+             unsigned long        nackCount;
+             unsigned long        firCount;
+             unsigned long        pliCount;
+             DOMString            encoderImplementation;
+             boolean              powerEfficientEncoder;
+             boolean              active;
+             DOMString            scalabilityMode;
+};
+
+enum RTCQualityLimitationReason {
+  "none",
+  "cpu",
+  "bandwidth",
+  "other",
+};
+
+dictionary RTCRemoteOutboundRtpStreamStats : RTCSentRtpStreamStats {
+             DOMString           localId;
+             DOMHighResTimeStamp remoteTimestamp;
+             unsigned long long  reportsSent;
+             double              roundTripTime;
+             double              totalRoundTripTime;
+             unsigned long long  roundTripTimeMeasurements;
+};
+
+dictionary RTCMediaSourceStats : RTCStats {
+             required DOMString       trackIdentifier;
+             required DOMString       kind;
+};
+
+dictionary RTCAudioSourceStats : RTCMediaSourceStats {
+              double              audioLevel;
+              double              totalAudioEnergy;
+              double              totalSamplesDuration;
+              double              echoReturnLoss;
+              double              echoReturnLossEnhancement;
+              double              droppedSamplesDuration;
+              unsigned long       droppedSamplesEvents;
+              double              totalCaptureDelay;
+              unsigned long long  totalSamplesCaptured;
+};
+
+dictionary RTCVideoSourceStats : RTCMediaSourceStats {
+             unsigned long   width;
+             unsigned long   height;
+             unsigned long   frames;
+             double          framesPerSecond;
+};
+
+dictionary RTCAudioPlayoutStats : RTCStats {
+             required DOMString kind;
+             double             synthesizedSamplesDuration;
+             unsigned long      synthesizedSamplesEvents;
+             double             totalSamplesDuration;
+             double             totalPlayoutDelay;
+             unsigned long long totalSamplesCount;
+};
+
+dictionary RTCPeerConnectionStats : RTCStats {
+            unsigned long dataChannelsOpened;
+            unsigned long dataChannelsClosed;
+};
+
+dictionary RTCDataChannelStats : RTCStats {
+             DOMString           label;
+             DOMString           protocol;
+             unsigned short      dataChannelIdentifier;
+             required RTCDataChannelState state;
+             unsigned long       messagesSent;
+             unsigned long long  bytesSent;
+             unsigned long       messagesReceived;
+             unsigned long long  bytesReceived;
+};
+
+dictionary RTCTransportStats : RTCStats {
+             unsigned long long    packetsSent;
+             unsigned long long    packetsReceived;
+             unsigned long long    bytesSent;
+             unsigned long long    bytesReceived;
+             RTCIceRole            iceRole;
+             DOMString             iceLocalUsernameFragment;
+             required RTCDtlsTransportState dtlsState;
+             RTCIceTransportState  iceState;
+             DOMString             selectedCandidatePairId;
+             DOMString             localCertificateId;
+             DOMString             remoteCertificateId;
+             DOMString             tlsVersion;
+             DOMString             dtlsCipher;
+             RTCDtlsRole           dtlsRole;
+             DOMString             srtpCipher;
+             unsigned long         selectedCandidatePairChanges;
+};
+
+enum RTCDtlsRole {
+      "client",
+      "server",
+      "unknown",
+};
+
+dictionary RTCIceCandidateStats : RTCStats {
+             required DOMString       transportId;
+             DOMString?               address;
+             long                     port;
+             DOMString                protocol;
+             required RTCIceCandidateType candidateType;
+             long                     priority;
+             DOMString                url;
+             RTCIceServerTransportProtocol relayProtocol;
+             DOMString                foundation;
+             DOMString                relatedAddress;
+             long                     relatedPort;
+             DOMString                usernameFragment;
+             RTCIceTcpCandidateType   tcpType;
+};
+
+dictionary RTCIceCandidatePairStats : RTCStats {
+             required DOMString            transportId;
+             required DOMString            localCandidateId;
+             required DOMString            remoteCandidateId;
+             required RTCStatsIceCandidatePairState state;
+             boolean                       nominated;
+             unsigned long long            packetsSent;
+             unsigned long long            packetsReceived;
+             unsigned long long            bytesSent;
+             unsigned long long            bytesReceived;
+             DOMHighResTimeStamp           lastPacketSentTimestamp;
+             DOMHighResTimeStamp           lastPacketReceivedTimestamp;
+             double                        totalRoundTripTime;
+             double                        currentRoundTripTime;
+             double                        availableOutgoingBitrate;
+             double                        availableIncomingBitrate;
+             unsigned long long            requestsReceived;
+             unsigned long long            requestsSent;
+             unsigned long long            responsesReceived;
+             unsigned long long            responsesSent;
+             unsigned long long            consentRequestsSent;
+             unsigned long                 packetsDiscardedOnSend;
+             unsigned long long            bytesDiscardedOnSend;
+};
+
+enum RTCStatsIceCandidatePairState {
+    "frozen",
+    "waiting",
+    "in-progress",
+    "failed",
+    "succeeded"
+};
+
+dictionary RTCCertificateStats : RTCStats {
+             required DOMString fingerprint;
+             required DOMString fingerprintAlgorithm;
+             required DOMString base64Certificate;
+             DOMString issuerCertificateId;
+};
diff --git a/test/wpt/tests/interfaces/webrtc-svc.idl b/test/wpt/tests/interfaces/webrtc-svc.idl
new file mode 100644
index 00000000000..e67ed70e8a7
--- /dev/null
+++ b/test/wpt/tests/interfaces/webrtc-svc.idl
@@ -0,0 +1,8 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Scalable Video Coding (SVC) Extension for WebRTC (https://w3c.github.io/webrtc-svc/)
+
+partial dictionary RTCRtpEncodingParameters {
+             DOMString scalabilityMode;
+};
diff --git a/test/wpt/tests/interfaces/webrtc.idl b/test/wpt/tests/interfaces/webrtc.idl
new file mode 100644
index 00000000000..d631169f46f
--- /dev/null
+++ b/test/wpt/tests/interfaces/webrtc.idl
@@ -0,0 +1,628 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: WebRTC 1.0: Real-Time Communication Between Browsers (https://w3c.github.io/webrtc-pc/)
+
+dictionary RTCConfiguration {
+  sequence<RTCIceServer> iceServers = [];
+  RTCIceTransportPolicy iceTransportPolicy = "all";
+  RTCBundlePolicy bundlePolicy = "balanced";
+  RTCRtcpMuxPolicy rtcpMuxPolicy = "require";
+  sequence<RTCCertificate> certificates = [];
+  [EnforceRange] octet iceCandidatePoolSize = 0;
+};
+
+dictionary RTCIceServer {
+  required (DOMString or sequence<DOMString>) urls;
+  DOMString username;
+  DOMString credential;
+};
+
+enum RTCIceTransportPolicy {
+  "relay",
+  "all"
+};
+
+enum RTCBundlePolicy {
+  "balanced",
+  "max-compat",
+  "max-bundle"
+};
+
+enum RTCRtcpMuxPolicy {
+  "require"
+};
+
+dictionary RTCOfferAnswerOptions {};
+
+dictionary RTCOfferOptions : RTCOfferAnswerOptions {
+  boolean iceRestart = false;
+};
+
+dictionary RTCAnswerOptions : RTCOfferAnswerOptions {};
+
+enum RTCSignalingState {
+  "stable",
+  "have-local-offer",
+  "have-remote-offer",
+  "have-local-pranswer",
+  "have-remote-pranswer",
+  "closed"
+};
+
+enum RTCIceGatheringState {
+"new",
+"gathering",
+"complete"
+     };
+
+enum RTCPeerConnectionState {
+"closed",
+"failed",
+"disconnected",
+"new",
+"connecting",
+"connected"
+     };
+
+enum RTCIceConnectionState {
+"closed",
+"failed",
+"disconnected",
+"new",
+"checking",
+"completed",
+"connected"
+     };
+
+[Exposed=Window]
+interface RTCPeerConnection : EventTarget  {
+  constructor(optional RTCConfiguration configuration = {});
+  Promise<RTCSessionDescriptionInit> createOffer(optional RTCOfferOptions options = {});
+  Promise<RTCSessionDescriptionInit> createAnswer(optional RTCAnswerOptions options = {});
+  Promise<undefined> setLocalDescription(optional RTCLocalSessionDescriptionInit description = {});
+  readonly attribute RTCSessionDescription? localDescription;
+  readonly attribute RTCSessionDescription? currentLocalDescription;
+  readonly attribute RTCSessionDescription? pendingLocalDescription;
+  Promise<undefined> setRemoteDescription(RTCSessionDescriptionInit description);
+  readonly attribute RTCSessionDescription? remoteDescription;
+  readonly attribute RTCSessionDescription? currentRemoteDescription;
+  readonly attribute RTCSessionDescription? pendingRemoteDescription;
+  Promise<undefined> addIceCandidate(optional RTCIceCandidateInit candidate = {});
+  readonly attribute RTCSignalingState signalingState;
+  readonly attribute RTCIceGatheringState iceGatheringState;
+  readonly attribute RTCIceConnectionState iceConnectionState;
+  readonly attribute RTCPeerConnectionState connectionState;
+  readonly attribute boolean? canTrickleIceCandidates;
+  undefined restartIce();
+  RTCConfiguration getConfiguration();
+  undefined setConfiguration(optional RTCConfiguration configuration = {});
+  undefined close();
+  attribute EventHandler onnegotiationneeded;
+  attribute EventHandler onicecandidate;
+  attribute EventHandler onicecandidateerror;
+  attribute EventHandler onsignalingstatechange;
+  attribute EventHandler oniceconnectionstatechange;
+  attribute EventHandler onicegatheringstatechange;
+  attribute EventHandler onconnectionstatechange;
+
+  // Legacy Interface Extensions
+  // Supporting the methods in this section is optional.
+  // If these methods are supported
+  // they must be implemented as defined
+  // in section "Legacy Interface Extensions"
+  Promise<undefined> createOffer(RTCSessionDescriptionCallback successCallback,
+                            RTCPeerConnectionErrorCallback failureCallback,
+                            optional RTCOfferOptions options = {});
+  Promise<undefined> setLocalDescription(RTCLocalSessionDescriptionInit description,
+                                    VoidFunction successCallback,
+                                    RTCPeerConnectionErrorCallback failureCallback);
+  Promise<undefined> createAnswer(RTCSessionDescriptionCallback successCallback,
+                             RTCPeerConnectionErrorCallback failureCallback);
+  Promise<undefined> setRemoteDescription(RTCSessionDescriptionInit description,
+                                     VoidFunction successCallback,
+                                     RTCPeerConnectionErrorCallback failureCallback);
+  Promise<undefined> addIceCandidate(RTCIceCandidateInit candidate,
+                                VoidFunction successCallback,
+                                RTCPeerConnectionErrorCallback failureCallback);
+};
+
+callback RTCPeerConnectionErrorCallback = undefined (DOMException error);
+
+callback RTCSessionDescriptionCallback = undefined (RTCSessionDescriptionInit description);
+
+partial dictionary RTCOfferOptions {
+  boolean offerToReceiveAudio;
+  boolean offerToReceiveVideo;
+};
+
+enum RTCSdpType {
+  "offer",
+  "pranswer",
+  "answer",
+  "rollback"
+};
+
+[Exposed=Window]
+interface RTCSessionDescription {
+  constructor(RTCSessionDescriptionInit descriptionInitDict);
+  readonly attribute RTCSdpType type;
+  readonly attribute DOMString sdp;
+  [Default] object toJSON();
+};
+
+dictionary RTCSessionDescriptionInit {
+  required RTCSdpType type;
+  DOMString sdp = "";
+};
+
+dictionary RTCLocalSessionDescriptionInit {
+  RTCSdpType type;
+  DOMString sdp = "";
+};
+
+[Exposed=Window]
+interface RTCIceCandidate {
+  constructor(optional RTCIceCandidateInit candidateInitDict = {});
+  readonly attribute DOMString candidate;
+  readonly attribute DOMString? sdpMid;
+  readonly attribute unsigned short? sdpMLineIndex;
+  readonly attribute DOMString? foundation;
+  readonly attribute RTCIceComponent? component;
+  readonly attribute unsigned long? priority;
+  readonly attribute DOMString? address;
+  readonly attribute RTCIceProtocol? protocol;
+  readonly attribute unsigned short? port;
+  readonly attribute RTCIceCandidateType? type;
+  readonly attribute RTCIceTcpCandidateType? tcpType;
+  readonly attribute DOMString? relatedAddress;
+  readonly attribute unsigned short? relatedPort;
+  readonly attribute DOMString? usernameFragment;
+  readonly attribute RTCIceServerTransportProtocol? relayProtocol;
+  readonly attribute DOMString? url;
+  RTCIceCandidateInit toJSON();
+};
+
+dictionary RTCIceCandidateInit {
+  DOMString candidate = "";
+  DOMString? sdpMid = null;
+  unsigned short? sdpMLineIndex = null;
+  DOMString? usernameFragment = null;
+};
+
+enum RTCIceProtocol {
+  "udp",
+  "tcp"
+};
+
+enum RTCIceTcpCandidateType {
+  "active",
+  "passive",
+  "so"
+};
+
+enum RTCIceCandidateType {
+  "host",
+  "srflx",
+  "prflx",
+  "relay"
+};
+
+enum RTCIceServerTransportProtocol {
+  "udp",
+  "tcp",
+  "tls",
+};
+
+[Exposed=Window]
+interface RTCPeerConnectionIceEvent : Event {
+  constructor(DOMString type, optional RTCPeerConnectionIceEventInit eventInitDict = {});
+  readonly attribute RTCIceCandidate? candidate;
+  readonly attribute DOMString? url;
+};
+
+dictionary RTCPeerConnectionIceEventInit : EventInit {
+  RTCIceCandidate? candidate;
+  DOMString? url;
+};
+
+[Exposed=Window]
+interface RTCPeerConnectionIceErrorEvent : Event {
+  constructor(DOMString type, RTCPeerConnectionIceErrorEventInit eventInitDict);
+  readonly attribute DOMString? address;
+  readonly attribute unsigned short? port;
+  readonly attribute DOMString url;
+  readonly attribute unsigned short errorCode;
+  readonly attribute USVString errorText;
+};
+
+dictionary RTCPeerConnectionIceErrorEventInit : EventInit {
+  DOMString? address;
+  unsigned short? port;
+  DOMString url;
+  required unsigned short errorCode;
+  USVString errorText;
+};
+
+partial interface RTCPeerConnection {
+  static Promise<RTCCertificate>
+      generateCertificate(AlgorithmIdentifier keygenAlgorithm);
+};
+
+dictionary RTCCertificateExpiration {
+  [EnforceRange] unsigned long long expires;
+};
+
+[Exposed=Window, Serializable]
+interface RTCCertificate {
+  readonly attribute EpochTimeStamp expires;
+  sequence<RTCDtlsFingerprint> getFingerprints();
+};
+
+partial interface RTCPeerConnection {
+  sequence<RTCRtpSender> getSenders();
+  sequence<RTCRtpReceiver> getReceivers();
+  sequence<RTCRtpTransceiver> getTransceivers();
+  RTCRtpSender addTrack(MediaStreamTrack track, MediaStream... streams);
+  undefined removeTrack(RTCRtpSender sender);
+  RTCRtpTransceiver addTransceiver((MediaStreamTrack or DOMString) trackOrKind,
+                                   optional RTCRtpTransceiverInit init = {});
+  attribute EventHandler ontrack;
+};
+
+dictionary RTCRtpTransceiverInit {
+  RTCRtpTransceiverDirection direction = "sendrecv";
+  sequence<MediaStream> streams = [];
+  sequence<RTCRtpEncodingParameters> sendEncodings = [];
+};
+
+enum RTCRtpTransceiverDirection {
+  "sendrecv",
+  "sendonly",
+  "recvonly",
+  "inactive",
+  "stopped"
+};
+
+[Exposed=Window]
+interface RTCRtpSender {
+  readonly attribute MediaStreamTrack? track;
+  readonly attribute RTCDtlsTransport? transport;
+  static RTCRtpCapabilities? getCapabilities(DOMString kind);
+  Promise<undefined> setParameters(RTCRtpSendParameters parameters);
+  RTCRtpSendParameters getParameters();
+  Promise<undefined> replaceTrack(MediaStreamTrack? withTrack);
+  undefined setStreams(MediaStream... streams);
+  Promise<RTCStatsReport> getStats();
+};
+
+dictionary RTCRtpParameters {
+  required sequence<RTCRtpHeaderExtensionParameters> headerExtensions;
+  required RTCRtcpParameters rtcp;
+  required sequence<RTCRtpCodecParameters> codecs;
+};
+
+dictionary RTCRtpSendParameters : RTCRtpParameters {
+  required DOMString transactionId;
+  required sequence<RTCRtpEncodingParameters> encodings;
+};
+
+dictionary RTCRtpReceiveParameters : RTCRtpParameters {
+};
+
+dictionary RTCRtpCodingParameters {
+  DOMString rid;
+};
+
+dictionary RTCRtpEncodingParameters : RTCRtpCodingParameters {
+  boolean active = true;
+  unsigned long maxBitrate;
+  double maxFramerate;
+  double scaleResolutionDownBy;
+};
+
+dictionary RTCRtcpParameters {
+  DOMString cname;
+  boolean reducedSize;
+};
+
+dictionary RTCRtpHeaderExtensionParameters {
+  required DOMString uri;
+  required unsigned short id;
+  boolean encrypted = false;
+};
+
+dictionary RTCRtpCodecParameters {
+  required octet payloadType;
+  required DOMString mimeType;
+  required unsigned long clockRate;
+  unsigned short channels;
+  DOMString sdpFmtpLine;
+};
+
+dictionary RTCRtpCapabilities {
+  required sequence<RTCRtpCodecCapability> codecs;
+  required sequence<RTCRtpHeaderExtensionCapability> headerExtensions;
+};
+
+dictionary RTCRtpCodecCapability {
+  required DOMString mimeType;
+  required unsigned long clockRate;
+  unsigned short channels;
+  DOMString sdpFmtpLine;
+};
+
+dictionary RTCRtpHeaderExtensionCapability {
+  DOMString uri;
+};
+
+[Exposed=Window]
+interface RTCRtpReceiver {
+  readonly attribute MediaStreamTrack track;
+  readonly attribute RTCDtlsTransport? transport;
+  static RTCRtpCapabilities? getCapabilities(DOMString kind);
+  RTCRtpReceiveParameters getParameters();
+  sequence<RTCRtpContributingSource> getContributingSources();
+  sequence<RTCRtpSynchronizationSource> getSynchronizationSources();
+  Promise<RTCStatsReport> getStats();
+};
+
+dictionary RTCRtpContributingSource {
+  required DOMHighResTimeStamp timestamp;
+  required unsigned long source;
+  double audioLevel;
+  required unsigned long rtpTimestamp;
+};
+
+dictionary RTCRtpSynchronizationSource : RTCRtpContributingSource {};
+
+[Exposed=Window]
+interface RTCRtpTransceiver {
+  readonly attribute DOMString? mid;
+  [SameObject] readonly attribute RTCRtpSender sender;
+  [SameObject] readonly attribute RTCRtpReceiver receiver;
+  attribute RTCRtpTransceiverDirection direction;
+  readonly attribute RTCRtpTransceiverDirection? currentDirection;
+  undefined stop();
+  undefined setCodecPreferences(sequence<RTCRtpCodecCapability> codecs);
+};
+
+[Exposed=Window]
+interface RTCDtlsTransport : EventTarget {
+  [SameObject] readonly attribute RTCIceTransport iceTransport;
+  readonly attribute RTCDtlsTransportState state;
+  sequence<ArrayBuffer> getRemoteCertificates();
+  attribute EventHandler onstatechange;
+  attribute EventHandler onerror;
+};
+
+enum RTCDtlsTransportState {
+  "new",
+  "connecting",
+  "connected",
+  "closed",
+  "failed"
+};
+
+dictionary RTCDtlsFingerprint {
+  DOMString algorithm;
+  DOMString value;
+};
+
+[Exposed=Window]
+interface RTCIceTransport : EventTarget {
+  readonly attribute RTCIceRole role;
+  readonly attribute RTCIceComponent component;
+  readonly attribute RTCIceTransportState state;
+  readonly attribute RTCIceGathererState gatheringState;
+  sequence<RTCIceCandidate> getLocalCandidates();
+  sequence<RTCIceCandidate> getRemoteCandidates();
+  RTCIceCandidatePair? getSelectedCandidatePair();
+  RTCIceParameters? getLocalParameters();
+  RTCIceParameters? getRemoteParameters();
+  attribute EventHandler onstatechange;
+  attribute EventHandler ongatheringstatechange;
+  attribute EventHandler onselectedcandidatepairchange;
+};
+
+dictionary RTCIceParameters {
+  DOMString usernameFragment;
+  DOMString password;
+};
+
+dictionary RTCIceCandidatePair {
+  RTCIceCandidate local;
+  RTCIceCandidate remote;
+};
+
+enum RTCIceGathererState {
+  "new",
+  "gathering",
+  "complete"
+};
+
+enum RTCIceTransportState {
+  "new",
+  "checking",
+  "connected",
+  "completed",
+  "disconnected",
+  "failed",
+  "closed"
+};
+
+enum RTCIceRole {
+  "unknown",
+  "controlling",
+  "controlled"
+};
+
+enum RTCIceComponent {
+  "rtp",
+  "rtcp"
+};
+
+[Exposed=Window]
+interface RTCTrackEvent : Event {
+  constructor(DOMString type, RTCTrackEventInit eventInitDict);
+  readonly attribute RTCRtpReceiver receiver;
+  readonly attribute MediaStreamTrack track;
+  [SameObject] readonly attribute FrozenArray<MediaStream> streams;
+  readonly attribute RTCRtpTransceiver transceiver;
+};
+
+dictionary RTCTrackEventInit : EventInit {
+  required RTCRtpReceiver receiver;
+  required MediaStreamTrack track;
+  sequence<MediaStream> streams = [];
+  required RTCRtpTransceiver transceiver;
+};
+
+partial interface RTCPeerConnection {
+  readonly attribute RTCSctpTransport? sctp;
+  RTCDataChannel createDataChannel(USVString label,
+                                   optional RTCDataChannelInit dataChannelDict = {});
+  attribute EventHandler ondatachannel;
+};
+
+[Exposed=Window]
+interface RTCSctpTransport : EventTarget {
+  readonly attribute RTCDtlsTransport transport;
+  readonly attribute RTCSctpTransportState state;
+  readonly attribute unrestricted double maxMessageSize;
+  readonly attribute unsigned short? maxChannels;
+  attribute EventHandler onstatechange;
+};
+
+enum RTCSctpTransportState {
+  "connecting",
+  "connected",
+  "closed"
+};
+
+[Exposed=Window]
+interface RTCDataChannel : EventTarget {
+  readonly attribute USVString label;
+  readonly attribute boolean ordered;
+  readonly attribute unsigned short? maxPacketLifeTime;
+  readonly attribute unsigned short? maxRetransmits;
+  readonly attribute USVString protocol;
+  readonly attribute boolean negotiated;
+  readonly attribute unsigned short? id;
+  readonly attribute RTCDataChannelState readyState;
+  readonly attribute unsigned long bufferedAmount;
+  [EnforceRange] attribute unsigned long bufferedAmountLowThreshold;
+  attribute EventHandler onopen;
+  attribute EventHandler onbufferedamountlow;
+  attribute EventHandler onerror;
+  attribute EventHandler onclosing;
+  attribute EventHandler onclose;
+  undefined close();
+  attribute EventHandler onmessage;
+  attribute BinaryType binaryType;
+  undefined send(USVString data);
+  undefined send(Blob data);
+  undefined send(ArrayBuffer data);
+  undefined send(ArrayBufferView data);
+};
+
+dictionary RTCDataChannelInit {
+  boolean ordered = true;
+  [EnforceRange] unsigned short maxPacketLifeTime;
+  [EnforceRange] unsigned short maxRetransmits;
+  USVString protocol = "";
+  boolean negotiated = false;
+  [EnforceRange] unsigned short id;
+};
+
+enum RTCDataChannelState {
+  "connecting",
+  "open",
+  "closing",
+  "closed"
+};
+
+[Exposed=Window]
+interface RTCDataChannelEvent : Event {
+  constructor(DOMString type, RTCDataChannelEventInit eventInitDict);
+  readonly attribute RTCDataChannel channel;
+};
+
+dictionary RTCDataChannelEventInit : EventInit {
+  required RTCDataChannel channel;
+};
+
+partial interface RTCRtpSender {
+  readonly attribute RTCDTMFSender? dtmf;
+};
+
+[Exposed=Window]
+interface RTCDTMFSender : EventTarget {
+  undefined insertDTMF(DOMString tones, optional unsigned long duration = 100, optional unsigned long interToneGap = 70);
+  attribute EventHandler ontonechange;
+  readonly attribute boolean canInsertDTMF;
+  readonly attribute DOMString toneBuffer;
+};
+
+[Exposed=Window]
+interface RTCDTMFToneChangeEvent : Event {
+  constructor(DOMString type, optional RTCDTMFToneChangeEventInit eventInitDict = {});
+  readonly attribute DOMString tone;
+};
+
+dictionary RTCDTMFToneChangeEventInit : EventInit {
+  DOMString tone = "";
+};
+
+partial interface RTCPeerConnection {
+  Promise<RTCStatsReport> getStats(optional MediaStreamTrack? selector = null);
+};
+
+[Exposed=Window]
+interface RTCStatsReport {
+  readonly maplike<DOMString, object>;
+};
+
+dictionary RTCStats {
+  required DOMHighResTimeStamp timestamp;
+  required RTCStatsType type;
+  required DOMString id;
+};
+
+[Exposed=Window]
+interface RTCError : DOMException {
+  constructor(RTCErrorInit init, optional DOMString message = "");
+  readonly attribute RTCErrorDetailType errorDetail;
+  readonly attribute long? sdpLineNumber;
+  readonly attribute long? sctpCauseCode;
+  readonly attribute unsigned long? receivedAlert;
+  readonly attribute unsigned long? sentAlert;
+};
+
+dictionary RTCErrorInit {
+  required RTCErrorDetailType errorDetail;
+  long sdpLineNumber;
+  long sctpCauseCode;
+  unsigned long receivedAlert;
+  unsigned long sentAlert;
+};
+
+enum RTCErrorDetailType {
+  "data-channel-failure",
+  "dtls-failure",
+  "fingerprint-failure",
+  "sctp-failure",
+  "sdp-syntax-error",
+  "hardware-encoder-not-available",
+  "hardware-encoder-error"
+};
+
+[Exposed=Window]
+interface RTCErrorEvent : Event {
+  constructor(DOMString type, RTCErrorEventInit eventInitDict);
+  [SameObject] readonly attribute RTCError error;
+};
+
+dictionary RTCErrorEventInit : EventInit {
+  required RTCError error;
+};
diff --git a/test/wpt/tests/interfaces/webtransport.idl b/test/wpt/tests/interfaces/webtransport.idl
new file mode 100644
index 00000000000..ba705807f12
--- /dev/null
+++ b/test/wpt/tests/interfaces/webtransport.idl
@@ -0,0 +1,142 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: WebTransport (https://w3c.github.io/webtransport/)
+
+[Exposed=(Window,Worker), SecureContext]
+interface WebTransportDatagramDuplexStream {
+  readonly attribute ReadableStream readable;
+  readonly attribute WritableStream writable;
+
+  readonly attribute unsigned long maxDatagramSize;
+  attribute double? incomingMaxAge;
+  attribute double? outgoingMaxAge;
+  attribute long incomingHighWaterMark;
+  attribute long outgoingHighWaterMark;
+};
+
+[Exposed=(Window,Worker), SecureContext]
+interface WebTransport {
+  constructor(USVString url, optional WebTransportOptions options = {});
+
+  Promise<WebTransportStats> getStats();
+  readonly attribute Promise<undefined> ready;
+  readonly attribute WebTransportReliabilityMode reliability;
+  readonly attribute WebTransportCongestionControl congestionControl;
+  readonly attribute Promise<WebTransportCloseInfo> closed;
+  undefined close(optional WebTransportCloseInfo closeInfo = {});
+
+  readonly attribute WebTransportDatagramDuplexStream datagrams;
+
+  Promise<WebTransportBidirectionalStream> createBidirectionalStream(
+      optional WebTransportSendStreamOptions options = {});
+  /* a ReadableStream of WebTransportBidirectionalStream objects */
+  readonly attribute ReadableStream incomingBidirectionalStreams;
+
+  Promise<WebTransportSendStream> createUnidirectionalStream(
+      optional WebTransportSendStreamOptions options = {});
+  /* a ReadableStream of WebTransportReceiveStream objects */
+  readonly attribute ReadableStream incomingUnidirectionalStreams;
+};
+
+enum WebTransportReliabilityMode {
+  "pending",
+  "reliable-only",
+  "supports-unreliable",
+};
+
+dictionary WebTransportHash {
+  DOMString algorithm;
+  BufferSource value;
+};
+
+dictionary WebTransportOptions {
+  boolean allowPooling = false;
+  boolean requireUnreliable = false;
+  sequence<WebTransportHash> serverCertificateHashes;
+  WebTransportCongestionControl congestionControl = "default";
+};
+
+enum WebTransportCongestionControl {
+  "default",
+  "throughput",
+  "low-latency",
+};
+
+dictionary WebTransportCloseInfo {
+  unsigned long closeCode = 0;
+  USVString reason = "";
+};
+
+dictionary WebTransportSendStreamOptions {
+  long long? sendOrder = null;
+};
+
+dictionary WebTransportStats {
+  DOMHighResTimeStamp timestamp;
+  unsigned long long bytesSent;
+  unsigned long long packetsSent;
+  unsigned long long packetsLost;
+  unsigned long numOutgoingStreamsCreated;
+  unsigned long numIncomingStreamsCreated;
+  unsigned long long bytesReceived;
+  unsigned long long packetsReceived;
+  DOMHighResTimeStamp smoothedRtt;
+  DOMHighResTimeStamp rttVariation;
+  DOMHighResTimeStamp minRtt;
+  WebTransportDatagramStats datagrams;
+};
+
+dictionary WebTransportDatagramStats {
+  DOMHighResTimeStamp timestamp;
+  unsigned long long expiredOutgoing;
+  unsigned long long droppedIncoming;
+  unsigned long long lostOutgoing;
+};
+
+[Exposed=(Window,Worker), SecureContext, Transferable]
+interface WebTransportSendStream : WritableStream {
+  Promise<WebTransportSendStreamStats> getStats();
+};
+
+dictionary WebTransportSendStreamStats {
+  DOMHighResTimeStamp timestamp;
+  unsigned long long bytesWritten;
+  unsigned long long bytesSent;
+  unsigned long long bytesAcknowledged;
+};
+
+[Exposed=(Window,Worker), SecureContext, Transferable]
+interface WebTransportReceiveStream : ReadableStream {
+  Promise<WebTransportReceiveStreamStats> getStats();
+};
+
+dictionary WebTransportReceiveStreamStats {
+  DOMHighResTimeStamp timestamp;
+  unsigned long long bytesReceived;
+  unsigned long long bytesRead;
+};
+
+[Exposed=(Window,Worker), SecureContext]
+interface WebTransportBidirectionalStream {
+  readonly attribute WebTransportReceiveStream readable;
+  readonly attribute WebTransportSendStream writable;
+};
+
+[Exposed=(Window,Worker), SecureContext]
+interface WebTransportError : DOMException {
+  constructor(optional WebTransportErrorInit init = {});
+
+  readonly attribute WebTransportErrorSource source;
+  readonly attribute octet? streamErrorCode;
+};
+
+dictionary WebTransportErrorInit {
+  [Clamp] octet streamErrorCode;
+  DOMString message;
+};
+
+enum WebTransportErrorSource {
+  "stream",
+  "session",
+};
diff --git a/test/wpt/tests/interfaces/webusb.idl b/test/wpt/tests/interfaces/webusb.idl
new file mode 100644
index 00000000000..fb0a71f307d
--- /dev/null
+++ b/test/wpt/tests/interfaces/webusb.idl
@@ -0,0 +1,249 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: WebUSB API (https://wicg.github.io/webusb/)
+
+dictionary USBDeviceFilter {
+  unsigned short vendorId;
+  unsigned short productId;
+  octet classCode;
+  octet subclassCode;
+  octet protocolCode;
+  DOMString serialNumber;
+};
+
+dictionary USBDeviceRequestOptions {
+  required sequence<USBDeviceFilter> filters;
+};
+
+[Exposed=(Worker,Window), SecureContext]
+interface USB : EventTarget {
+  attribute EventHandler onconnect;
+  attribute EventHandler ondisconnect;
+  Promise<sequence<USBDevice>> getDevices();
+  [Exposed=Window] Promise<USBDevice> requestDevice(USBDeviceRequestOptions options);
+};
+
+[Exposed=Window, SecureContext]
+partial interface Navigator {
+  [SameObject] readonly attribute USB usb;
+};
+
+[Exposed=Worker, SecureContext]
+partial interface WorkerNavigator {
+  [SameObject] readonly attribute USB usb;
+};
+
+dictionary USBConnectionEventInit : EventInit {
+    required USBDevice device;
+};
+
+[
+  Exposed=(DedicatedWorker,SharedWorker,Window),
+  SecureContext
+]
+interface USBConnectionEvent : Event {
+  constructor(DOMString type, USBConnectionEventInit eventInitDict);
+  [SameObject] readonly attribute USBDevice device;
+};
+
+enum USBTransferStatus {
+  "ok",
+  "stall",
+  "babble"
+};
+
+[
+  Exposed=(DedicatedWorker,SharedWorker,Window),
+  SecureContext
+]
+interface USBInTransferResult {
+  constructor(USBTransferStatus status, optional DataView? data);
+  readonly attribute DataView? data;
+  readonly attribute USBTransferStatus status;
+};
+
+[
+  Exposed=(DedicatedWorker,SharedWorker,Window),
+  SecureContext
+]
+interface USBOutTransferResult {
+  constructor(USBTransferStatus status, optional unsigned long bytesWritten = 0);
+  readonly attribute unsigned long bytesWritten;
+  readonly attribute USBTransferStatus status;
+};
+
+[
+  Exposed=(DedicatedWorker,SharedWorker,Window),
+  SecureContext
+]
+interface USBIsochronousInTransferPacket {
+  constructor(USBTransferStatus status, optional DataView? data);
+  readonly attribute DataView? data;
+  readonly attribute USBTransferStatus status;
+};
+
+[
+  Exposed=(DedicatedWorker,SharedWorker,Window),
+  SecureContext
+]
+interface USBIsochronousInTransferResult {
+  constructor(sequence<USBIsochronousInTransferPacket> packets, optional DataView? data);
+  readonly attribute DataView? data;
+  readonly attribute FrozenArray<USBIsochronousInTransferPacket> packets;
+};
+
+[
+  Exposed=(DedicatedWorker,SharedWorker,Window),
+  SecureContext
+]
+interface USBIsochronousOutTransferPacket {
+  constructor(USBTransferStatus status, optional unsigned long bytesWritten = 0);
+  readonly attribute unsigned long bytesWritten;
+  readonly attribute USBTransferStatus status;
+};
+
+[
+  Exposed=(DedicatedWorker,SharedWorker,Window),
+  SecureContext
+]
+interface USBIsochronousOutTransferResult {
+  constructor(sequence<USBIsochronousOutTransferPacket> packets);
+  readonly attribute FrozenArray<USBIsochronousOutTransferPacket> packets;
+};
+
+[Exposed=(DedicatedWorker,SharedWorker,Window), SecureContext]
+interface USBDevice {
+  readonly attribute octet usbVersionMajor;
+  readonly attribute octet usbVersionMinor;
+  readonly attribute octet usbVersionSubminor;
+  readonly attribute octet deviceClass;
+  readonly attribute octet deviceSubclass;
+  readonly attribute octet deviceProtocol;
+  readonly attribute unsigned short vendorId;
+  readonly attribute unsigned short productId;
+  readonly attribute octet deviceVersionMajor;
+  readonly attribute octet deviceVersionMinor;
+  readonly attribute octet deviceVersionSubminor;
+  readonly attribute DOMString? manufacturerName;
+  readonly attribute DOMString? productName;
+  readonly attribute DOMString? serialNumber;
+  readonly attribute USBConfiguration? configuration;
+  readonly attribute FrozenArray<USBConfiguration> configurations;
+  readonly attribute boolean opened;
+  Promise<undefined> open();
+  Promise<undefined> close();
+  Promise<undefined> forget();
+  Promise<undefined> selectConfiguration(octet configurationValue);
+  Promise<undefined> claimInterface(octet interfaceNumber);
+  Promise<undefined> releaseInterface(octet interfaceNumber);
+  Promise<undefined> selectAlternateInterface(octet interfaceNumber, octet alternateSetting);
+  Promise<USBInTransferResult> controlTransferIn(USBControlTransferParameters setup, unsigned short length);
+  Promise<USBOutTransferResult> controlTransferOut(USBControlTransferParameters setup, optional BufferSource data);
+  Promise<undefined> clearHalt(USBDirection direction, octet endpointNumber);
+  Promise<USBInTransferResult> transferIn(octet endpointNumber, unsigned long length);
+  Promise<USBOutTransferResult> transferOut(octet endpointNumber, BufferSource data);
+  Promise<USBIsochronousInTransferResult> isochronousTransferIn(octet endpointNumber, sequence<unsigned long> packetLengths);
+  Promise<USBIsochronousOutTransferResult> isochronousTransferOut(octet endpointNumber, BufferSource data, sequence<unsigned long> packetLengths);
+  Promise<undefined> reset();
+};
+
+enum USBRequestType {
+  "standard",
+  "class",
+  "vendor"
+};
+
+enum USBRecipient {
+  "device",
+  "interface",
+  "endpoint",
+  "other"
+};
+
+dictionary USBControlTransferParameters {
+  required USBRequestType requestType;
+  required USBRecipient recipient;
+  required octet request;
+  required unsigned short value;
+  required unsigned short index;
+};
+
+[
+  Exposed=(DedicatedWorker,SharedWorker,Window),
+  SecureContext
+]
+interface USBConfiguration {
+  constructor(USBDevice device, octet configurationValue);
+  readonly attribute octet configurationValue;
+  readonly attribute DOMString? configurationName;
+  readonly attribute FrozenArray<USBInterface> interfaces;
+};
+
+[
+  Exposed=(DedicatedWorker,SharedWorker,Window),
+  SecureContext
+]
+interface USBInterface {
+  constructor(USBConfiguration configuration, octet interfaceNumber);
+  readonly attribute octet interfaceNumber;
+  readonly attribute USBAlternateInterface alternate;
+  readonly attribute FrozenArray<USBAlternateInterface> alternates;
+  readonly attribute boolean claimed;
+};
+
+[
+  Exposed=(DedicatedWorker,SharedWorker,Window),
+  SecureContext
+]
+interface USBAlternateInterface {
+  constructor(USBInterface deviceInterface, octet alternateSetting);
+  readonly attribute octet alternateSetting;
+  readonly attribute octet interfaceClass;
+  readonly attribute octet interfaceSubclass;
+  readonly attribute octet interfaceProtocol;
+  readonly attribute DOMString? interfaceName;
+  readonly attribute FrozenArray<USBEndpoint> endpoints;
+};
+
+enum USBDirection {
+  "in",
+  "out"
+};
+
+enum USBEndpointType {
+  "bulk",
+  "interrupt",
+  "isochronous"
+};
+
+[
+  Exposed=(DedicatedWorker,SharedWorker,Window),
+  SecureContext
+]
+interface USBEndpoint {
+  constructor(USBAlternateInterface alternate, octet endpointNumber, USBDirection direction);
+  readonly attribute octet endpointNumber;
+  readonly attribute USBDirection direction;
+  readonly attribute USBEndpointType type;
+  readonly attribute unsigned long packetSize;
+};
+
+dictionary USBPermissionDescriptor : PermissionDescriptor {
+  sequence<USBDeviceFilter> filters;
+};
+
+dictionary AllowedUSBDevice {
+  required octet vendorId;
+  required octet productId;
+  DOMString serialNumber;
+};
+
+dictionary USBPermissionStorage {
+  sequence<AllowedUSBDevice> allowedDevices = [];
+};
+
+[Exposed=(DedicatedWorker,SharedWorker,Window)]
+interface USBPermissionResult : PermissionStatus {
+  attribute FrozenArray<USBDevice> devices;
+};
diff --git a/test/wpt/tests/interfaces/webvr.tentative.idl b/test/wpt/tests/interfaces/webvr.tentative.idl
new file mode 100644
index 00000000000..2fc5f4e52bd
--- /dev/null
+++ b/test/wpt/tests/interfaces/webvr.tentative.idl
@@ -0,0 +1,204 @@
+// Archived version of the WebVR spec from
+// https://w3c.github.io/webvr/archive/prerelease/1.1/index.html
+
+[Exposed=Window]
+interface VRDisplay : EventTarget {
+  readonly attribute boolean isPresenting;
+
+  /**
+   * Dictionary of capabilities describing the VRDisplay.
+   */
+  [SameObject] readonly attribute VRDisplayCapabilities capabilities;
+
+  /**
+   * If this VRDisplay supports room-scale experiences, the optional
+   * stage attribute contains details on the room-scale parameters.
+   * The stageParameters attribute can not change between null
+   * and non-null once the VRDisplay is enumerated; however,
+   * the values within VRStageParameters may change after
+   * any call to VRDisplay.submitFrame as the user may re-configure
+   * their environment at any time.
+   */
+  readonly attribute VRStageParameters? stageParameters;
+
+  /**
+   * Return the current VREyeParameters for the given eye.
+   */
+  VREyeParameters getEyeParameters(VREye whichEye);
+
+  /**
+   * An identifier for this distinct VRDisplay. Used as an
+   * association point in the Gamepad API.
+   */
+  readonly attribute unsigned long displayId;
+
+  /**
+   * A display name, a user-readable name identifying it.
+   */
+  readonly attribute DOMString displayName;
+
+  /**
+   * Populates the passed VRFrameData with the information required to render
+   * the current frame.
+   */
+  boolean getFrameData(VRFrameData frameData);
+
+  /**
+   * z-depth defining the near plane of the eye view frustum
+   * enables mapping of values in the render target depth
+   * attachment to scene coordinates. Initially set to 0.01.
+   */
+  attribute double depthNear;
+
+  /**
+   * z-depth defining the far plane of the eye view frustum
+   * enables mapping of values in the render target depth
+   * attachment to scene coordinates. Initially set to 10000.0.
+   */
+  attribute double depthFar;
+
+  /**
+   * The callback passed to `requestAnimationFrame` will be called
+   * any time a new frame should be rendered. When the VRDisplay is
+   * presenting the callback will be called at the native refresh
+   * rate of the HMD. When not presenting this function acts
+   * identically to how window.requestAnimationFrame acts. Content should
+   * make no assumptions of frame rate or vsync behavior as the HMD runs
+   * asynchronously from other displays and at differing refresh rates.
+   */
+  long requestAnimationFrame(FrameRequestCallback callback);
+
+  /**
+   * Passing the value returned by `requestAnimationFrame` to
+   * `cancelAnimationFrame` will unregister the callback.
+   */
+  undefined cancelAnimationFrame(long handle);
+
+  /**
+   * Begin presenting to the VRDisplay. Must be called in response to a user gesture.
+   * Repeat calls while already presenting will update the layers being displayed.
+   * If the number of values in the leftBounds/rightBounds arrays is not 0 or 4 for any of the passed layers the promise is rejected
+   * If the source of any of the layers is not present (null), the promise is rejected.
+   */
+  Promise<undefined> requestPresent(sequence<VRLayerInit> layers);
+
+  /**
+   * Stops presenting to the VRDisplay.
+   */
+  Promise<undefined> exitPresent();
+
+  /**
+   * Get the layers currently being presented.
+   */
+  sequence<VRLayerInit> getLayers();
+
+  /**
+   * The layer provided to the VRDisplay will be captured and presented
+   * in the HMD. Calling this function has the same effect on the source
+   * canvas as any other operation that uses its source image, and canvases
+   * created without preserveDrawingBuffer set to true will be cleared.
+   */
+  undefined submitFrame();
+};
+
+typedef (HTMLCanvasElement or
+         OffscreenCanvas) VRSource;
+
+dictionary VRLayerInit {
+  VRSource? source = null;
+
+  sequence<float> leftBounds = [];
+  sequence<float> rightBounds = [];
+};
+
+[Exposed=Window]
+interface VRDisplayCapabilities {
+  readonly attribute boolean hasPosition;
+  readonly attribute boolean hasExternalDisplay;
+  readonly attribute boolean canPresent;
+  readonly attribute unsigned long maxLayers;
+};
+
+enum VREye {
+  "left",
+  "right"
+};
+
+[Exposed=Window]
+interface VRPose {
+  readonly attribute Float32Array? position;
+  readonly attribute Float32Array? linearVelocity;
+  readonly attribute Float32Array? linearAcceleration;
+
+  readonly attribute Float32Array? orientation;
+  readonly attribute Float32Array? angularVelocity;
+  readonly attribute Float32Array? angularAcceleration;
+};
+
+[Exposed=Window]
+interface VRFrameData {
+  constructor();
+
+  readonly attribute Float32Array leftProjectionMatrix;
+  readonly attribute Float32Array leftViewMatrix;
+
+  readonly attribute Float32Array rightProjectionMatrix;
+  readonly attribute Float32Array rightViewMatrix;
+
+  readonly attribute VRPose pose;
+};
+
+[Exposed=Window]
+interface VREyeParameters {
+  readonly attribute Float32Array offset;
+
+  readonly attribute unsigned long renderWidth;
+  readonly attribute unsigned long renderHeight;
+};
+
+[Exposed=Window]
+interface VRStageParameters {
+  readonly attribute Float32Array sittingToStandingTransform;
+
+  readonly attribute float sizeX;
+  readonly attribute float sizeZ;
+};
+
+partial interface Navigator {
+  Promise<sequence<VRDisplay>> getVRDisplays();
+  readonly attribute FrozenArray<VRDisplay> activeVRDisplays;
+  readonly attribute boolean vrEnabled;
+};
+
+enum VRDisplayEventReason {
+  "mounted",
+  "navigation",
+  "requested",
+  "unmounted"
+};
+
+[Exposed=Window]
+interface VRDisplayEvent : Event {
+  constructor(DOMString type, VRDisplayEventInit eventInitDict);
+  readonly attribute VRDisplay display;
+  readonly attribute VRDisplayEventReason? reason;
+};
+
+dictionary VRDisplayEventInit : EventInit {
+  required VRDisplay display;
+  VRDisplayEventReason reason;
+};
+
+partial interface Window {
+  attribute EventHandler onvrdisplayconnect;
+  attribute EventHandler onvrdisplaydisconnect;
+  attribute EventHandler onvrdisplayactivate;
+  attribute EventHandler onvrdisplaydeactivate;
+  attribute EventHandler onvrdisplayblur;
+  attribute EventHandler onvrdisplayfocus;
+  attribute EventHandler onvrdisplaypresentchange;
+};
+
+partial interface Gamepad {
+  readonly attribute unsigned long displayId;
+};
diff --git a/test/wpt/tests/interfaces/webvtt.idl b/test/wpt/tests/interfaces/webvtt.idl
new file mode 100644
index 00000000000..730e893e980
--- /dev/null
+++ b/test/wpt/tests/interfaces/webvtt.idl
@@ -0,0 +1,40 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: WebVTT: The Web Video Text Tracks Format (https://w3c.github.io/webvtt/)
+
+enum AutoKeyword { "auto" };
+typedef (double or AutoKeyword) LineAndPositionSetting;
+enum DirectionSetting { "" /* horizontal */, "rl", "lr" };
+enum LineAlignSetting { "start", "center", "end" };
+enum PositionAlignSetting { "line-left", "center", "line-right", "auto" };
+enum AlignSetting { "start", "center", "end", "left", "right" };
+[Exposed=Window]
+interface VTTCue : TextTrackCue {
+  constructor(double startTime, unrestricted double endTime, DOMString text);
+  attribute VTTRegion? region;
+  attribute DirectionSetting vertical;
+  attribute boolean snapToLines;
+  attribute LineAndPositionSetting line;
+  attribute LineAlignSetting lineAlign;
+  attribute LineAndPositionSetting position;
+  attribute PositionAlignSetting positionAlign;
+  attribute double size;
+  attribute AlignSetting align;
+  attribute DOMString text;
+  DocumentFragment getCueAsHTML();
+};
+
+enum ScrollSetting { "" /* none */, "up" };
+[Exposed=Window]
+interface VTTRegion {
+  constructor();
+  attribute DOMString id;
+  attribute double width;
+  attribute unsigned long lines;
+  attribute double regionAnchorX;
+  attribute double regionAnchorY;
+  attribute double viewportAnchorX;
+  attribute double viewportAnchorY;
+  attribute ScrollSetting scroll;
+};
diff --git a/test/wpt/tests/interfaces/webxr-ar-module.idl b/test/wpt/tests/interfaces/webxr-ar-module.idl
new file mode 100644
index 00000000000..c3677fecdce
--- /dev/null
+++ b/test/wpt/tests/interfaces/webxr-ar-module.idl
@@ -0,0 +1,29 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: WebXR Augmented Reality Module - Level 1 (https://immersive-web.github.io/webxr-ar-module/)
+
+enum XREnvironmentBlendMode {
+  "opaque",
+  "alpha-blend",
+  "additive"
+};
+
+partial interface XRSession {
+  // Attributes
+  readonly attribute XREnvironmentBlendMode environmentBlendMode;
+};
+
+enum XRInteractionMode {
+    "screen-space",
+    "world-space",
+};
+
+partial interface XRSession {
+  // Attributes
+  readonly attribute XRInteractionMode interactionMode;
+};
+
+partial interface XRView {
+  readonly attribute boolean isFirstPersonObserver;
+};
diff --git a/test/wpt/tests/interfaces/webxr-depth-sensing.idl b/test/wpt/tests/interfaces/webxr-depth-sensing.idl
new file mode 100644
index 00000000000..c44f029436f
--- /dev/null
+++ b/test/wpt/tests/interfaces/webxr-depth-sensing.idl
@@ -0,0 +1,57 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: WebXR Depth Sensing Module (https://immersive-web.github.io/depth-sensing/)
+
+enum XRDepthUsage {
+  "cpu-optimized",
+  "gpu-optimized",
+};
+
+enum XRDepthDataFormat {
+  "luminance-alpha",
+  "float32"
+};
+
+dictionary XRDepthStateInit {
+  required sequence<XRDepthUsage> usagePreference;
+  required sequence<XRDepthDataFormat> dataFormatPreference;
+};
+
+partial dictionary XRSessionInit {
+  XRDepthStateInit depthSensing;
+};
+
+partial interface XRSession {
+  readonly attribute XRDepthUsage depthUsage;
+  readonly attribute XRDepthDataFormat depthDataFormat;
+};
+
+[SecureContext, Exposed=Window]
+interface XRDepthInformation {
+  readonly attribute unsigned long width;
+  readonly attribute unsigned long height;
+
+  [SameObject] readonly attribute XRRigidTransform normDepthBufferFromNormView;
+  readonly attribute float rawValueToMeters;
+};
+
+[Exposed=Window]
+interface XRCPUDepthInformation : XRDepthInformation {
+  [SameObject] readonly attribute ArrayBuffer data;
+
+  float getDepthInMeters(float x, float y);
+};
+
+partial interface XRFrame {
+  XRCPUDepthInformation? getDepthInformation(XRView view);
+};
+
+[Exposed=Window]
+interface XRWebGLDepthInformation : XRDepthInformation {
+  [SameObject] readonly attribute WebGLTexture texture;
+};
+
+partial interface XRWebGLBinding {
+  XRWebGLDepthInformation? getDepthInformation(XRView view);
+};
diff --git a/test/wpt/tests/interfaces/webxr-dom-overlays.idl b/test/wpt/tests/interfaces/webxr-dom-overlays.idl
new file mode 100644
index 00000000000..5e358c233c3
--- /dev/null
+++ b/test/wpt/tests/interfaces/webxr-dom-overlays.idl
@@ -0,0 +1,31 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: WebXR DOM Overlays Module (https://immersive-web.github.io/dom-overlays/)
+
+partial interface mixin GlobalEventHandlers {
+  attribute EventHandler onbeforexrselect;
+};
+
+partial dictionary XRSessionInit {
+  XRDOMOverlayInit? domOverlay;
+};
+
+partial interface XRSession {
+  readonly attribute XRDOMOverlayState? domOverlayState;
+};
+
+dictionary XRDOMOverlayInit {
+  required Element root;
+};
+
+enum XRDOMOverlayType {
+  "screen",
+  "floating",
+  "head-locked"
+};
+
+dictionary XRDOMOverlayState {
+  XRDOMOverlayType type;
+
+};
diff --git a/test/wpt/tests/interfaces/webxr-gamepads-module.idl b/test/wpt/tests/interfaces/webxr-gamepads-module.idl
new file mode 100644
index 00000000000..f63921c0150
--- /dev/null
+++ b/test/wpt/tests/interfaces/webxr-gamepads-module.idl
@@ -0,0 +1,8 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: WebXR Gamepads Module - Level 1 (https://immersive-web.github.io/webxr-gamepads-module/)
+
+partial interface XRInputSource {
+  [SameObject] readonly attribute Gamepad? gamepad;
+};
diff --git a/test/wpt/tests/interfaces/webxr-hand-input.idl b/test/wpt/tests/interfaces/webxr-hand-input.idl
new file mode 100644
index 00000000000..9a1127724ee
--- /dev/null
+++ b/test/wpt/tests/interfaces/webxr-hand-input.idl
@@ -0,0 +1,66 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: WebXR Hand Input Module - Level 1 (https://immersive-web.github.io/webxr-hand-input/)
+
+partial interface XRInputSource {
+   [SameObject] readonly attribute XRHand? hand;
+};
+
+enum XRHandJoint {
+  "wrist",
+
+  "thumb-metacarpal",
+  "thumb-phalanx-proximal",
+  "thumb-phalanx-distal",
+  "thumb-tip",
+
+  "index-finger-metacarpal",
+  "index-finger-phalanx-proximal",
+  "index-finger-phalanx-intermediate",
+  "index-finger-phalanx-distal",
+  "index-finger-tip",
+
+  "middle-finger-metacarpal",
+  "middle-finger-phalanx-proximal",
+  "middle-finger-phalanx-intermediate",
+  "middle-finger-phalanx-distal",
+  "middle-finger-tip",
+
+  "ring-finger-metacarpal",
+  "ring-finger-phalanx-proximal",
+  "ring-finger-phalanx-intermediate",
+  "ring-finger-phalanx-distal",
+  "ring-finger-tip",
+
+  "pinky-finger-metacarpal",
+  "pinky-finger-phalanx-proximal",
+  "pinky-finger-phalanx-intermediate",
+  "pinky-finger-phalanx-distal",
+  "pinky-finger-tip"
+};
+
+[Exposed=Window]
+interface XRHand {
+    iterable<XRHandJoint, XRJointSpace>;
+
+    readonly attribute unsigned long size;
+    XRJointSpace get(XRHandJoint key);
+};
+
+[Exposed=Window]
+interface XRJointSpace: XRSpace {
+  readonly attribute XRHandJoint jointName;
+};
+
+partial interface XRFrame {
+    XRJointPose? getJointPose(XRJointSpace joint, XRSpace baseSpace);
+    boolean fillJointRadii(sequence<XRJointSpace> jointSpaces, Float32Array radii);
+
+    boolean fillPoses(sequence<XRSpace> spaces, XRSpace baseSpace, Float32Array transforms);
+};
+
+[Exposed=Window]
+interface XRJointPose: XRPose {
+    readonly attribute float radius;
+};
diff --git a/test/wpt/tests/interfaces/webxr-hit-test.idl b/test/wpt/tests/interfaces/webxr-hit-test.idl
new file mode 100644
index 00000000000..fa4fb71c9de
--- /dev/null
+++ b/test/wpt/tests/interfaces/webxr-hit-test.idl
@@ -0,0 +1,69 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: WebXR Hit Test Module (https://immersive-web.github.io/hit-test/)
+
+enum XRHitTestTrackableType {
+  "point",
+  "plane",
+  "mesh"
+};
+
+dictionary XRHitTestOptionsInit {
+  required XRSpace space;
+  FrozenArray<XRHitTestTrackableType> entityTypes;
+  XRRay offsetRay;
+};
+
+dictionary XRTransientInputHitTestOptionsInit {
+  required DOMString profile;
+  FrozenArray<XRHitTestTrackableType> entityTypes;
+  XRRay offsetRay;
+};
+
+[SecureContext, Exposed=Window]
+interface XRHitTestSource {
+  undefined cancel();
+};
+
+[SecureContext, Exposed=Window]
+interface XRTransientInputHitTestSource {
+  undefined cancel();
+};
+
+[SecureContext, Exposed=Window]
+interface XRHitTestResult {
+  XRPose? getPose(XRSpace baseSpace);
+};
+
+[SecureContext, Exposed=Window]
+interface XRTransientInputHitTestResult {
+  [SameObject] readonly attribute XRInputSource inputSource;
+  readonly attribute FrozenArray<XRHitTestResult> results;
+};
+
+partial interface XRSession {
+  Promise<XRHitTestSource> requestHitTestSource(XRHitTestOptionsInit options);
+  Promise<XRTransientInputHitTestSource> requestHitTestSourceForTransientInput(XRTransientInputHitTestOptionsInit options);
+};
+
+partial interface XRFrame {
+  FrozenArray<XRHitTestResult> getHitTestResults(XRHitTestSource hitTestSource);
+  FrozenArray<XRTransientInputHitTestResult> getHitTestResultsForTransientInput(XRTransientInputHitTestSource hitTestSource);
+};
+
+dictionary XRRayDirectionInit {
+  double x = 0;
+  double y = 0;
+  double z = -1;
+  double w = 0;
+};
+
+[SecureContext, Exposed=Window]
+interface XRRay {
+  constructor(optional DOMPointInit origin = {}, optional XRRayDirectionInit direction = {});
+  constructor(XRRigidTransform transform);
+  [SameObject] readonly attribute DOMPointReadOnly origin;
+  [SameObject] readonly attribute DOMPointReadOnly direction;
+  [SameObject] readonly attribute Float32Array matrix;
+};
diff --git a/test/wpt/tests/interfaces/webxr-lighting-estimation.idl b/test/wpt/tests/interfaces/webxr-lighting-estimation.idl
new file mode 100644
index 00000000000..35aa1d746a7
--- /dev/null
+++ b/test/wpt/tests/interfaces/webxr-lighting-estimation.idl
@@ -0,0 +1,39 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: WebXR Lighting Estimation API Level 1 (https://immersive-web.github.io/lighting-estimation/)
+
+[SecureContext, Exposed=Window]
+interface XRLightProbe : EventTarget {
+  readonly attribute XRSpace probeSpace;
+  attribute EventHandler onreflectionchange;
+};
+
+enum XRReflectionFormat {
+  "srgba8",
+  "rgba16f",
+};
+
+[SecureContext, Exposed=Window]
+interface XRLightEstimate {
+  readonly attribute Float32Array sphericalHarmonicsCoefficients;
+  readonly attribute DOMPointReadOnly primaryLightDirection;
+  readonly attribute DOMPointReadOnly primaryLightIntensity;
+};
+
+dictionary XRLightProbeInit {
+  XRReflectionFormat reflectionFormat = "srgba8";
+};
+
+partial interface XRSession {
+  Promise<XRLightProbe> requestLightProbe(optional XRLightProbeInit options = {});
+  readonly attribute XRReflectionFormat preferredReflectionFormat;
+};
+
+partial interface XRFrame {
+  XRLightEstimate? getLightEstimate(XRLightProbe lightProbe);
+};
+
+partial interface XRWebGLBinding {
+  WebGLTexture? getReflectionCubeMap(XRLightProbe lightProbe);
+};
diff --git a/test/wpt/tests/interfaces/webxr.idl b/test/wpt/tests/interfaces/webxr.idl
new file mode 100644
index 00000000000..939da53364d
--- /dev/null
+++ b/test/wpt/tests/interfaces/webxr.idl
@@ -0,0 +1,294 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: WebXR Device API (https://immersive-web.github.io/webxr/)
+
+partial interface Navigator {
+  [SecureContext, SameObject] readonly attribute XRSystem xr;
+};
+
+[SecureContext, Exposed=Window] interface XRSystem : EventTarget {
+  // Methods
+  Promise<boolean> isSessionSupported(XRSessionMode mode);
+  [NewObject] Promise<XRSession> requestSession(XRSessionMode mode, optional XRSessionInit options = {});
+
+  // Events
+  attribute EventHandler ondevicechange;
+};
+
+enum XRSessionMode {
+  "inline",
+  "immersive-vr",
+  "immersive-ar"
+};
+
+dictionary XRSessionInit {
+  sequence<DOMString> requiredFeatures;
+  sequence<DOMString> optionalFeatures;
+};
+
+enum XRVisibilityState {
+  "visible",
+  "visible-blurred",
+  "hidden",
+};
+
+[SecureContext, Exposed=Window] interface XRSession : EventTarget {
+  // Attributes
+  readonly attribute XRVisibilityState visibilityState;
+  readonly attribute float? frameRate;
+  readonly attribute Float32Array? supportedFrameRates;
+  [SameObject] readonly attribute XRRenderState renderState;
+  [SameObject] readonly attribute XRInputSourceArray inputSources;
+  readonly attribute FrozenArray<DOMString> enabledFeatures;
+
+  // Methods
+  undefined updateRenderState(optional XRRenderStateInit state = {});
+  Promise<undefined> updateTargetFrameRate(float rate);
+  [NewObject] Promise<XRReferenceSpace> requestReferenceSpace(XRReferenceSpaceType type);
+
+  unsigned long requestAnimationFrame(XRFrameRequestCallback callback);
+  undefined cancelAnimationFrame(unsigned long handle);
+
+  Promise<undefined> end();
+
+  // Events
+  attribute EventHandler onend;
+  attribute EventHandler oninputsourceschange;
+  attribute EventHandler onselect;
+  attribute EventHandler onselectstart;
+  attribute EventHandler onselectend;
+  attribute EventHandler onsqueeze;
+  attribute EventHandler onsqueezestart;
+  attribute EventHandler onsqueezeend;
+  attribute EventHandler onvisibilitychange;
+  attribute EventHandler onframeratechange;
+};
+
+dictionary XRRenderStateInit {
+  double depthNear;
+  double depthFar;
+  double inlineVerticalFieldOfView;
+  XRWebGLLayer? baseLayer;
+  sequence<XRLayer>? layers;
+};
+
+[SecureContext, Exposed=Window] interface XRRenderState {
+  readonly attribute double depthNear;
+  readonly attribute double depthFar;
+  readonly attribute double? inlineVerticalFieldOfView;
+  readonly attribute XRWebGLLayer? baseLayer;
+};
+
+callback XRFrameRequestCallback = undefined (DOMHighResTimeStamp time, XRFrame frame);
+
+[SecureContext, Exposed=Window] interface XRFrame {
+  [SameObject] readonly attribute XRSession session;
+  readonly attribute DOMHighResTimeStamp predictedDisplayTime;
+
+  XRViewerPose? getViewerPose(XRReferenceSpace referenceSpace);
+  XRPose? getPose(XRSpace space, XRSpace baseSpace);
+};
+
+[SecureContext, Exposed=Window] interface XRSpace : EventTarget {
+
+};
+
+enum XRReferenceSpaceType {
+  "viewer",
+  "local",
+  "local-floor",
+  "bounded-floor",
+  "unbounded"
+};
+
+[SecureContext, Exposed=Window]
+interface XRReferenceSpace : XRSpace {
+  [NewObject] XRReferenceSpace getOffsetReferenceSpace(XRRigidTransform originOffset);
+
+  attribute EventHandler onreset;
+};
+
+[SecureContext, Exposed=Window]
+interface XRBoundedReferenceSpace : XRReferenceSpace {
+  readonly attribute FrozenArray<DOMPointReadOnly> boundsGeometry;
+};
+
+enum XREye {
+  "none",
+  "left",
+  "right"
+};
+
+[SecureContext, Exposed=Window] interface XRView {
+  readonly attribute XREye eye;
+  readonly attribute Float32Array projectionMatrix;
+  [SameObject] readonly attribute XRRigidTransform transform;
+  readonly attribute double? recommendedViewportScale;
+
+  undefined requestViewportScale(double? scale);
+};
+
+[SecureContext, Exposed=Window] interface XRViewport {
+  readonly attribute long x;
+  readonly attribute long y;
+  readonly attribute long width;
+  readonly attribute long height;
+};
+
+[SecureContext, Exposed=Window]
+interface XRRigidTransform {
+  constructor(optional DOMPointInit position = {}, optional DOMPointInit orientation = {});
+  [SameObject] readonly attribute DOMPointReadOnly position;
+  [SameObject] readonly attribute DOMPointReadOnly orientation;
+  readonly attribute Float32Array matrix;
+  [SameObject] readonly attribute XRRigidTransform inverse;
+};
+
+[SecureContext, Exposed=Window] interface XRPose {
+  [SameObject] readonly attribute XRRigidTransform transform;
+  [SameObject] readonly attribute DOMPointReadOnly? linearVelocity;
+  [SameObject] readonly attribute DOMPointReadOnly? angularVelocity;
+
+  readonly attribute boolean emulatedPosition;
+};
+
+[SecureContext, Exposed=Window] interface XRViewerPose : XRPose {
+  [SameObject] readonly attribute FrozenArray<XRView> views;
+};
+
+enum XRHandedness {
+  "none",
+  "left",
+  "right"
+};
+
+enum XRTargetRayMode {
+  "gaze",
+  "tracked-pointer",
+  "screen"
+};
+
+[SecureContext, Exposed=Window]
+interface XRInputSource {
+  readonly attribute XRHandedness handedness;
+  readonly attribute XRTargetRayMode targetRayMode;
+  [SameObject] readonly attribute XRSpace targetRaySpace;
+  [SameObject] readonly attribute XRSpace? gripSpace;
+  [SameObject] readonly attribute FrozenArray<DOMString> profiles;
+};
+
+[SecureContext, Exposed=Window]
+interface XRInputSourceArray {
+  iterable<XRInputSource>;
+  readonly attribute unsigned long length;
+  getter XRInputSource(unsigned long index);
+};
+
+[SecureContext, Exposed=Window]
+interface XRLayer : EventTarget {};
+
+typedef (WebGLRenderingContext or
+         WebGL2RenderingContext) XRWebGLRenderingContext;
+
+dictionary XRWebGLLayerInit {
+  boolean antialias = true;
+  boolean depth = true;
+  boolean stencil = false;
+  boolean alpha = true;
+  boolean ignoreDepthValues = false;
+  double framebufferScaleFactor = 1.0;
+};
+
+[SecureContext, Exposed=Window]
+interface XRWebGLLayer: XRLayer {
+  constructor(XRSession session,
+             XRWebGLRenderingContext context,
+             optional XRWebGLLayerInit layerInit = {});
+  // Attributes
+  readonly attribute boolean antialias;
+  readonly attribute boolean ignoreDepthValues;
+  attribute float? fixedFoveation;
+
+  [SameObject] readonly attribute WebGLFramebuffer? framebuffer;
+  readonly attribute unsigned long framebufferWidth;
+  readonly attribute unsigned long framebufferHeight;
+
+  // Methods
+  XRViewport? getViewport(XRView view);
+
+  // Static Methods
+  static double getNativeFramebufferScaleFactor(XRSession session);
+};
+
+partial dictionary WebGLContextAttributes {
+    boolean xrCompatible = false;
+};
+
+partial interface mixin WebGLRenderingContextBase {
+    [NewObject] Promise<undefined> makeXRCompatible();
+};
+
+[SecureContext, Exposed=Window]
+interface XRSessionEvent : Event {
+  constructor(DOMString type, XRSessionEventInit eventInitDict);
+  [SameObject] readonly attribute XRSession session;
+};
+
+dictionary XRSessionEventInit : EventInit {
+  required XRSession session;
+};
+
+[SecureContext, Exposed=Window]
+interface XRInputSourceEvent : Event {
+  constructor(DOMString type, XRInputSourceEventInit eventInitDict);
+  [SameObject] readonly attribute XRFrame frame;
+  [SameObject] readonly attribute XRInputSource inputSource;
+};
+
+dictionary XRInputSourceEventInit : EventInit {
+  required XRFrame frame;
+  required XRInputSource inputSource;
+};
+
+[SecureContext, Exposed=Window]
+interface XRInputSourcesChangeEvent : Event {
+  constructor(DOMString type, XRInputSourcesChangeEventInit eventInitDict);
+  [SameObject] readonly attribute XRSession session;
+  [SameObject] readonly attribute FrozenArray<XRInputSource> added;
+  [SameObject] readonly attribute FrozenArray<XRInputSource> removed;
+};
+
+dictionary XRInputSourcesChangeEventInit : EventInit {
+  required XRSession session;
+  required FrozenArray<XRInputSource> added;
+  required FrozenArray<XRInputSource> removed;
+
+};
+
+[SecureContext, Exposed=Window]
+interface XRReferenceSpaceEvent : Event {
+  constructor(DOMString type, XRReferenceSpaceEventInit eventInitDict);
+  [SameObject] readonly attribute XRReferenceSpace referenceSpace;
+  [SameObject] readonly attribute XRRigidTransform? transform;
+};
+
+dictionary XRReferenceSpaceEventInit : EventInit {
+  required XRReferenceSpace referenceSpace;
+  XRRigidTransform? transform = null;
+};
+
+dictionary XRSessionSupportedPermissionDescriptor: PermissionDescriptor {
+  XRSessionMode mode;
+};
+
+dictionary XRPermissionDescriptor: PermissionDescriptor {
+  XRSessionMode mode;
+  sequence<DOMString> requiredFeatures;
+  sequence<DOMString> optionalFeatures;
+};
+
+[Exposed=Window]
+interface XRPermissionStatus: PermissionStatus {
+  attribute FrozenArray<DOMString> granted;
+};
diff --git a/test/wpt/tests/interfaces/webxrlayers.idl b/test/wpt/tests/interfaces/webxrlayers.idl
new file mode 100644
index 00000000000..e182f47b9c5
--- /dev/null
+++ b/test/wpt/tests/interfaces/webxrlayers.idl
@@ -0,0 +1,212 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: WebXR Layers API Level 1 (https://immersive-web.github.io/layers/)
+
+enum XRLayerLayout {
+  "default",
+  "mono",
+  "stereo",
+  "stereo-left-right",
+  "stereo-top-bottom"
+};
+
+[Exposed=Window] interface XRCompositionLayer : XRLayer {
+  readonly attribute XRLayerLayout layout;
+
+  attribute boolean blendTextureSourceAlpha;
+  attribute boolean forceMonoPresentation;
+  attribute float opacity;
+  readonly attribute unsigned long mipLevels;
+
+  readonly attribute boolean needsRedraw;
+
+  undefined destroy();
+};
+
+[Exposed=Window] interface XRProjectionLayer : XRCompositionLayer {
+  readonly attribute unsigned long textureWidth;
+  readonly attribute unsigned long textureHeight;
+  readonly attribute unsigned long textureArrayLength;
+
+  readonly attribute boolean ignoreDepthValues;
+  attribute float? fixedFoveation;
+  attribute XRRigidTransform? deltaPose;
+};
+
+[Exposed=Window] interface XRQuadLayer : XRCompositionLayer {
+  attribute XRSpace space;
+  attribute XRRigidTransform transform;
+
+  attribute float width;
+  attribute float height;
+
+  // Events
+  attribute EventHandler onredraw;
+};
+
+[Exposed=Window] interface XRCylinderLayer : XRCompositionLayer {
+  attribute XRSpace space;
+  attribute XRRigidTransform transform;
+
+  attribute float radius;
+  attribute float centralAngle;
+  attribute float aspectRatio;
+
+  // Events
+  attribute EventHandler onredraw;
+};
+
+[Exposed=Window] interface XREquirectLayer : XRCompositionLayer {
+  attribute XRSpace space;
+  attribute XRRigidTransform transform;
+
+  attribute float radius;
+  attribute float centralHorizontalAngle;
+  attribute float upperVerticalAngle;
+  attribute float lowerVerticalAngle;
+
+  // Events
+  attribute EventHandler onredraw;
+};
+
+[Exposed=Window] interface XRCubeLayer : XRCompositionLayer {
+  attribute XRSpace space;
+  attribute DOMPointReadOnly orientation;
+
+  // Events
+  attribute EventHandler onredraw;
+};
+
+[Exposed=Window] interface XRSubImage {
+  [SameObject] readonly attribute XRViewport viewport;
+};
+
+[Exposed=Window] interface XRWebGLSubImage : XRSubImage {
+  [SameObject] readonly attribute WebGLTexture colorTexture;
+  [SameObject] readonly attribute WebGLTexture? depthStencilTexture;
+  [SameObject] readonly attribute WebGLTexture? motionVectorTexture;
+
+  readonly attribute unsigned long? imageIndex;
+  readonly attribute unsigned long colorTextureWidth;
+  readonly attribute unsigned long colorTextureHeight;
+  readonly attribute unsigned long? depthStencilTextureWidth;
+  readonly attribute unsigned long? depthStencilTextureHeight;
+  readonly attribute unsigned long? motionVectorTextureWidth;
+  readonly attribute unsigned long? motionVectorTextureHeight;
+};
+
+enum XRTextureType {
+  "texture",
+  "texture-array"
+};
+
+dictionary XRProjectionLayerInit {
+  XRTextureType textureType = "texture";
+  GLenum colorFormat = 0x1908; // RGBA
+  GLenum depthFormat = 0x1902; // DEPTH_COMPONENT
+  double scaleFactor = 1.0;
+};
+
+dictionary XRLayerInit {
+  required XRSpace space;
+  GLenum colorFormat = 0x1908; // RGBA
+  GLenum? depthFormat;
+  unsigned long mipLevels = 1;
+  required unsigned long viewPixelWidth;
+  required unsigned long viewPixelHeight;
+  XRLayerLayout layout = "mono";
+  boolean isStatic = false;
+};
+
+dictionary XRQuadLayerInit : XRLayerInit {
+  XRTextureType textureType = "texture";
+  XRRigidTransform? transform;
+  float width = 1.0;
+  float height = 1.0;
+};
+
+dictionary XRCylinderLayerInit : XRLayerInit {
+  XRTextureType textureType = "texture";
+  XRRigidTransform? transform;
+  float radius = 2.0;
+  float centralAngle = 0.78539;
+  float aspectRatio = 2.0;
+};
+
+dictionary XREquirectLayerInit : XRLayerInit {
+  XRTextureType textureType = "texture";
+  XRRigidTransform? transform;
+  float radius = 0;
+  float centralHorizontalAngle = 6.28318;
+  float upperVerticalAngle = 1.570795;
+  float lowerVerticalAngle = -1.570795;
+};
+
+dictionary XRCubeLayerInit : XRLayerInit {
+  DOMPointReadOnly? orientation;
+};
+
+[Exposed=Window] interface XRWebGLBinding {
+  constructor(XRSession session, XRWebGLRenderingContext context);
+
+  readonly attribute double nativeProjectionScaleFactor;
+  readonly attribute boolean usesDepthValues;
+
+  XRProjectionLayer createProjectionLayer(optional XRProjectionLayerInit init = {});
+  XRQuadLayer createQuadLayer(optional XRQuadLayerInit init = {});
+  XRCylinderLayer createCylinderLayer(optional XRCylinderLayerInit init = {});
+  XREquirectLayer createEquirectLayer(optional XREquirectLayerInit init = {});
+  XRCubeLayer createCubeLayer(optional XRCubeLayerInit init = {});
+
+  XRWebGLSubImage getSubImage(XRCompositionLayer layer, XRFrame frame, optional XREye eye = "none");
+  XRWebGLSubImage getViewSubImage(XRProjectionLayer layer, XRView view);
+};
+
+dictionary XRMediaLayerInit {
+  required XRSpace space;
+  XRLayerLayout layout = "mono";
+  boolean invertStereo = false;
+};
+
+dictionary XRMediaQuadLayerInit : XRMediaLayerInit {
+  XRRigidTransform? transform;
+  float? width;
+  float? height;
+};
+
+dictionary XRMediaCylinderLayerInit : XRMediaLayerInit {
+  XRRigidTransform? transform;
+  float radius = 2.0;
+  float centralAngle = 0.78539;
+  float? aspectRatio;
+};
+
+dictionary XRMediaEquirectLayerInit : XRMediaLayerInit {
+  XRRigidTransform? transform;
+  float radius = 0.0;
+  float centralHorizontalAngle = 6.28318;
+  float upperVerticalAngle = 1.570795;
+  float lowerVerticalAngle = -1.570795;
+};
+
+[Exposed=Window] interface XRMediaBinding {
+  constructor(XRSession session);
+
+  XRQuadLayer createQuadLayer(HTMLVideoElement video, optional XRMediaQuadLayerInit init = {});
+  XRCylinderLayer createCylinderLayer(HTMLVideoElement video, optional XRMediaCylinderLayerInit init = {});
+  XREquirectLayer createEquirectLayer(HTMLVideoElement video, optional XRMediaEquirectLayerInit init = {});
+};
+
+[SecureContext, Exposed=Window] interface XRLayerEvent : Event {
+  constructor(DOMString type, XRLayerEventInit eventInitDict);
+  [SameObject] readonly attribute XRLayer layer;
+};
+
+dictionary XRLayerEventInit : EventInit {
+  required XRLayer layer;
+};
+
+[SecureContext, Exposed=Window] partial interface XRRenderState {
+  readonly attribute FrozenArray<XRLayer> layers;
+};
diff --git a/test/wpt/tests/interfaces/window-controls-overlay.idl b/test/wpt/tests/interfaces/window-controls-overlay.idl
new file mode 100644
index 00000000000..051978d693e
--- /dev/null
+++ b/test/wpt/tests/interfaces/window-controls-overlay.idl
@@ -0,0 +1,28 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Window Controls Overlay (https://wicg.github.io/window-controls-overlay/)
+
+[SecureContext, Exposed=(Window)]
+partial interface Navigator {
+  [SameObject] readonly attribute WindowControlsOverlay windowControlsOverlay;
+};
+
+[Exposed=Window]
+interface WindowControlsOverlay : EventTarget {
+  readonly attribute boolean visible;
+  DOMRect getTitlebarAreaRect();
+  attribute EventHandler ongeometrychange;
+};
+
+[Exposed=Window]
+interface WindowControlsOverlayGeometryChangeEvent : Event {
+  constructor(DOMString type, WindowControlsOverlayGeometryChangeEventInit eventInitDict);
+  [SameObject] readonly attribute DOMRect titlebarAreaRect;
+  readonly attribute boolean visible;
+};
+
+dictionary WindowControlsOverlayGeometryChangeEventInit : EventInit {
+  required DOMRect titlebarAreaRect;
+  boolean visible = false;
+};
diff --git a/test/wpt/tests/interfaces/window-placement.idl b/test/wpt/tests/interfaces/window-placement.idl
new file mode 100644
index 00000000000..ac86c1d502a
--- /dev/null
+++ b/test/wpt/tests/interfaces/window-placement.idl
@@ -0,0 +1,42 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: Multi-Screen Window Placement (https://w3c.github.io/window-placement/)
+
+partial interface Screen /* : EventTarget */ {
+  [SecureContext]
+  readonly attribute boolean isExtended;
+
+  [SecureContext]
+  attribute EventHandler onchange;
+};
+
+partial interface Window {
+  [SecureContext]
+  Promise<ScreenDetails> getScreenDetails();
+};
+
+[Exposed=Window, SecureContext]
+interface ScreenDetails : EventTarget {
+  readonly attribute FrozenArray<ScreenDetailed> screens;
+  readonly attribute ScreenDetailed currentScreen;
+
+  attribute EventHandler onscreenschange;
+  attribute EventHandler oncurrentscreenchange;
+};
+
+[Exposed=Window, SecureContext]
+interface ScreenDetailed : Screen {
+  readonly attribute long availLeft;
+  readonly attribute long availTop;
+  readonly attribute long left;
+  readonly attribute long top;
+  readonly attribute boolean isPrimary;
+  readonly attribute boolean isInternal;
+  readonly attribute float devicePixelRatio;
+  readonly attribute DOMString label;
+};
+
+partial dictionary FullscreenOptions {
+  ScreenDetailed screen;
+};
diff --git a/test/wpt/tests/interfaces/xhr.idl b/test/wpt/tests/interfaces/xhr.idl
new file mode 100644
index 00000000000..3abd09ce5ed
--- /dev/null
+++ b/test/wpt/tests/interfaces/xhr.idl
@@ -0,0 +1,99 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: XMLHttpRequest Standard (https://xhr.spec.whatwg.org/)
+
+[Exposed=(Window,DedicatedWorker,SharedWorker)]
+interface XMLHttpRequestEventTarget : EventTarget {
+  // event handlers
+  attribute EventHandler onloadstart;
+  attribute EventHandler onprogress;
+  attribute EventHandler onabort;
+  attribute EventHandler onerror;
+  attribute EventHandler onload;
+  attribute EventHandler ontimeout;
+  attribute EventHandler onloadend;
+};
+
+[Exposed=(Window,DedicatedWorker,SharedWorker)]
+interface XMLHttpRequestUpload : XMLHttpRequestEventTarget {
+};
+
+enum XMLHttpRequestResponseType {
+  "",
+  "arraybuffer",
+  "blob",
+  "document",
+  "json",
+  "text"
+};
+
+[Exposed=(Window,DedicatedWorker,SharedWorker)]
+interface XMLHttpRequest : XMLHttpRequestEventTarget {
+  constructor();
+
+  // event handler
+  attribute EventHandler onreadystatechange;
+
+  // states
+  const unsigned short UNSENT = 0;
+  const unsigned short OPENED = 1;
+  const unsigned short HEADERS_RECEIVED = 2;
+  const unsigned short LOADING = 3;
+  const unsigned short DONE = 4;
+  readonly attribute unsigned short readyState;
+
+  // request
+  undefined open(ByteString method, USVString url);
+  undefined open(ByteString method, USVString url, boolean async, optional USVString? username = null, optional USVString? password = null);
+  undefined setRequestHeader(ByteString name, ByteString value);
+           attribute unsigned long timeout;
+           attribute boolean withCredentials;
+  [SameObject] readonly attribute XMLHttpRequestUpload upload;
+  undefined send(optional (Document or XMLHttpRequestBodyInit)? body = null);
+  undefined abort();
+
+  // response
+  readonly attribute USVString responseURL;
+  readonly attribute unsigned short status;
+  readonly attribute ByteString statusText;
+  ByteString? getResponseHeader(ByteString name);
+  ByteString getAllResponseHeaders();
+  undefined overrideMimeType(DOMString mime);
+           attribute XMLHttpRequestResponseType responseType;
+  readonly attribute any response;
+  readonly attribute USVString responseText;
+  [Exposed=Window] readonly attribute Document? responseXML;
+};
+
+typedef (File or USVString) FormDataEntryValue;
+
+[Exposed=(Window,Worker)]
+interface FormData {
+  constructor(optional HTMLFormElement form);
+
+  undefined append(USVString name, USVString value);
+  undefined append(USVString name, Blob blobValue, optional USVString filename);
+  undefined delete(USVString name);
+  FormDataEntryValue? get(USVString name);
+  sequence<FormDataEntryValue> getAll(USVString name);
+  boolean has(USVString name);
+  undefined set(USVString name, USVString value);
+  undefined set(USVString name, Blob blobValue, optional USVString filename);
+  iterable<USVString, FormDataEntryValue>;
+};
+
+[Exposed=(Window,Worker)]
+interface ProgressEvent : Event {
+  constructor(DOMString type, optional ProgressEventInit eventInitDict = {});
+
+  readonly attribute boolean lengthComputable;
+  readonly attribute unsigned long long loaded;
+  readonly attribute unsigned long long total;
+};
+
+dictionary ProgressEventInit : EventInit {
+  boolean lengthComputable = false;
+  unsigned long long loaded = 0;
+  unsigned long long total = 0;
+};
diff --git a/test/wpt/tests/lint.ignore b/test/wpt/tests/lint.ignore
new file mode 100644
index 00000000000..cddc3203b67
--- /dev/null
+++ b/test/wpt/tests/lint.ignore
@@ -0,0 +1,864 @@
+# File containing allowlist for lint errors
+# Format is:
+# ERROR TYPE:file/name/pattern[:line number]
+# e.g.
+# TRAILING WHITESPACE:example/file.html:128
+# to allow trailing whitespace on example/file.html line 128
+
+## Whitespace rules that we can't enforce yet ##
+
+INDENT TABS: conformance-checkers/*
+INDENT TABS: encoding/legacy*/*
+
+TRAILING WHITESPACE: html/canvas/tools/current-work-canvas.xhtml
+TRAILING WHITESPACE: conformance-checkers/*
+TRAILING WHITESPACE: html/syntax/xmldecl/support/no-version-or-space-or-trailing-question-trailing-body-single-quotes-spaces-and-line-breaks-around-equals.htm
+TRAILING WHITESPACE: html/syntax/xmldecl/support/no-version-or-space-or-trailing-question-trailing-body-single-quotes-spaces-and-line-breaks-around-equals-trail.htm
+
+## File types that should never be checked ##
+
+TRAILING WHITESPACE, INDENT TABS, CR AT EOL: *.adts
+TRAILING WHITESPACE, INDENT TABS, CR AT EOL: *.pdf
+TRAILING WHITESPACE, INDENT TABS, CR AT EOL: *.jpg
+TRAILING WHITESPACE, INDENT TABS, CR AT EOL: *.png
+TRAILING WHITESPACE, INDENT TABS, CR AT EOL: *.gif
+TRAILING WHITESPACE, INDENT TABS, CR AT EOL: *.wav
+TRAILING WHITESPACE, INDENT TABS, CR AT EOL: *.mp3
+TRAILING WHITESPACE, INDENT TABS, CR AT EOL: *.m4a
+TRAILING WHITESPACE, INDENT TABS, CR AT EOL: *.mov
+TRAILING WHITESPACE, INDENT TABS, CR AT EOL: *.oga
+TRAILING WHITESPACE, INDENT TABS, CR AT EOL: *.ogv
+TRAILING WHITESPACE, INDENT TABS, CR AT EOL: *.webm
+TRAILING WHITESPACE, INDENT TABS, CR AT EOL: *.mp4
+TRAILING WHITESPACE, INDENT TABS, CR AT EOL: *.m4v
+TRAILING WHITESPACE, INDENT TABS, CR AT EOL: *.otf
+TRAILING WHITESPACE, INDENT TABS, CR AT EOL: *.ttf
+TRAILING WHITESPACE, INDENT TABS, CR AT EOL: *.TTF
+TRAILING WHITESPACE, INDENT TABS, CR AT EOL: *.ttc
+TRAILING WHITESPACE, INDENT TABS, CR AT EOL: *.woff
+TRAILING WHITESPACE, INDENT TABS, CR AT EOL: *.woff2
+TRAILING WHITESPACE, INDENT TABS, CR AT EOL: *.eot
+TRAILING WHITESPACE, INDENT TABS, CR AT EOL: *.sfd
+TRAILING WHITESPACE, INDENT TABS, CR AT EOL: *.swf
+TRAILING WHITESPACE, INDENT TABS, CR AT EOL: *.ani
+TRAILING WHITESPACE, INDENT TABS, CR AT EOL: *.cur
+TRAILING WHITESPACE, INDENT TABS, CR AT EOL: *.ico
+TRAILING WHITESPACE, INDENT TABS, CR AT EOL: *.wasm
+TRAILING WHITESPACE, INDENT TABS, CR AT EOL: *.bmp
+TRAILING WHITESPACE, INDENT TABS, CR AT EOL: *.sxg
+TRAILING WHITESPACE, INDENT TABS, CR AT EOL: *.wbn
+TRAILING WHITESPACE, INDENT TABS, CR AT EOL: *.avif
+
+## .gitignore
+W3C-TEST.ORG: .gitignore
+
+## Documentation ##
+
+W3C-TEST.ORG: README.md
+W3C-TEST.ORG: */README.md
+W3C-TEST.ORG: docs/*
+WEB-PLATFORM.TEST:*/README.md
+WEB-PLATFORM.TEST:docs/*
+CR AT EOL, INDENT TABS:docs/make.bat
+INDENT TABS:docs/Makefile
+
+## Helper scripts ##
+
+PRINT STATEMENT: */tools/*
+
+## Deliberate copies of Ahem ##
+# The allowed copy
+AHEM COPY: fonts/Ahem.ttf
+
+# None of these are actually Ahem
+AHEM COPY: fonts/ahem-extra/AHEM_*.TTF
+
+## Test exclusions ##
+
+# Intentional use of CRLF
+CR AT EOL: cors/resources/cors-headers.asis
+CR AT EOL: fetch/h1-parsing/resources/blue-with-0x00-in-a-header.asis
+CR AT EOL: html/semantics/forms/the-textarea-element/multiline-placeholder-cr.html
+CR AT EOL: html/semantics/forms/the-textarea-element/multiline-placeholder-crlf.html
+CR AT EOL: html/semantics/forms/the-input-element/multiline-placeholder-cr.html
+CR AT EOL: html/semantics/forms/the-input-element/multiline-placeholder-crlf.html
+CR AT EOL: webvtt/parsing/file-parsing/tests/support/newlines.vtt
+CR AT EOL: css/css-text/ellisize-rtl-text-crash.html
+CR AT EOL: html/syntax/charset/after-head-after-1kb-crlf.html
+CR AT EOL: html/syntax/charset/after-head-in-1kb-crlf.html
+
+# Intentional use of tabs
+INDENT TABS: html/semantics/embedded-content/the-canvas-element/size.attributes.parse.whitespace.html
+INDENT TABS: webvtt/parsing/file-parsing/tests/support/header-tab.vtt
+INDENT TABS: webvtt/parsing/file-parsing/tests/support/whitespace-chars.vtt
+
+## Intentional use of trailing whitespace
+TRAILING WHITESPACE: server-timing/resources/parsing/*
+TRAILING WHITESPACE: webvtt/parsing/file-parsing/support/*.vtt
+TRAILING WHITESPACE: webvtt/parsing/file-parsing/tests/support/*.vtt
+TRAILING WHITESPACE: xhr/resources/headers-some-are-empty.asis
+TRAILING WHITESPACE: content-security-policy/support/manifest.json
+
+# Intentional use of print statements
+PRINT STATEMENT: dom/nodes/Document-createElement-namespace-tests/generate.py
+PRINT STATEMENT: encrypted-media/polyfill/make-polyfill-tests.py
+PRINT STATEMENT: resources/test/conftest.py
+PRINT STATEMENT: webdriver/tests/support/helpers.py
+
+# semi-legitimate use of console.*
+CONSOLE: console/*
+CONSOLE: common/gc.js
+CONSOLE: resources/check-layout-th.js
+CONSOLE: resources/chromium/*
+CONSOLE: resources/testharness.js
+CONSOLE: service-workers/service-worker/resources/navigation-redirect-other-origin.html
+CONSOLE: service-workers/service-worker/navigation-redirect.https.html
+CONSOLE: service-workers/service-worker/resources/clients-get-other-origin.html
+CONSOLE: webrtc/tools/*
+CONSOLE: webaudio/resources/audit.js:41
+
+# use of console in a public library - annotation-model ensures
+# it is not actually used
+CONSOLE: annotation-model/scripts/ajv.min.js
+CONSOLE: annotation-model/scripts/showdown.min.js
+CR AT EOL: annotation-model/scripts/showdown.min.js
+
+# Helper files that aren't valid XML
+PARSE-FAILED: acid/acid3/empty.xml
+PARSE-FAILED: dom/nodes/Document-createElement-namespace-tests/empty.svg
+PARSE-FAILED: dom/nodes/Document-createElement-namespace-tests/empty.xhtml
+PARSE-FAILED: dom/nodes/Document-createElement-namespace-tests/empty.xml
+PARSE-FAILED: dom/nodes/Document-createElement-namespace-tests/minimal_html.svg
+PARSE-FAILED: dom/nodes/Document-createElement-namespace-tests/minimal_html.xhtml
+PARSE-FAILED: dom/nodes/Document-createElement-namespace-tests/minimal_html.xml
+PARSE-FAILED: custom-elements/xhtml-crash.xhtml
+
+# setTimeout usage (should probably mostly be fixed)
+SET TIMEOUT: *-manual.*
+SET TIMEOUT: annotation-model/scripts/ajv.min.js
+SET TIMEOUT: apng/animated-png-timeout.html
+SET TIMEOUT: avif/animated-avif-timeout.html
+SET TIMEOUT: cookies/resources/testharness-helpers.js
+SET TIMEOUT: common/reftest-wait.js
+SET TIMEOUT: compute-pressure/resources/support-iframe.html
+SET TIMEOUT: conformance-checkers/*
+SET TIMEOUT: content-security-policy/*
+SET TIMEOUT: css/compositing/opacity-and-transform-animation-crash.html
+SET TIMEOUT: css/css-contain/contain-body-overflow-002.html
+SET TIMEOUT: css/css-display/display-contents-shadow-dom-1.html
+SET TIMEOUT: css/CSS2/normal-flow/crashtests/block-in-inline-ax-crash.html
+SET TIMEOUT: css/selectors/selector-placeholder-shown-type-change-001.html
+SET TIMEOUT: css/selectors/selector-placeholder-shown-type-change-002.html
+SET TIMEOUT: css/selectors/selector-placeholder-shown-type-change-003.html
+SET TIMEOUT: css/selectors/selector-read-write-type-change-002.html
+SET TIMEOUT: css/selectors/selector-required-type-change-002.html
+SET TIMEOUT: css/selectors/invalidation/dir-pseudo-class-in-has.html
+SET TIMEOUT: css/selectors/invalidation/lang-pseudo-class-in-has-document-element.html
+SET TIMEOUT: css/selectors/invalidation/lang-pseudo-class-in-has-xhtml.xhtml
+SET TIMEOUT: css/selectors/invalidation/lang-pseudo-class-in-has.html
+SET TIMEOUT: encrypted-media/polyfill/chrome-polyfill.js
+SET TIMEOUT: encrypted-media/polyfill/clearkey-polyfill.js
+SET TIMEOUT: encrypted-media/scripts/playback-temporary-events.js
+SET TIMEOUT: fetch/metadata/resources/helper.sub.js
+SET TIMEOUT: fetch/metadata/resources/message-opener.html
+SET TIMEOUT: focus/support/iframe-focus-with-different-site-intermediate-frame-outer.sub.html
+SET TIMEOUT: focus/support/iframe-focus-with-different-site-intermediate-frame-middle.sub.html
+SET TIMEOUT: focus/support/iframe-contentwindow-focus-with-different-site-intermediate-frame-outer.sub.html
+SET TIMEOUT: focus/support/iframe-contentwindow-focus-with-different-site-intermediate-frame-middle.sub.html
+SET TIMEOUT: focus/support/iframe-focuses-parent-different-site-inner.html
+SET TIMEOUT: focus/support/iframe-focuses-parent-same-site-inner.html
+SET TIMEOUT: generic-sensor/resources/iframe_sensor_handler.html
+SET TIMEOUT: html/browsers/browsing-the-web/back-forward-cache/resources/inflight-fetch-helper.js
+SET TIMEOUT: html/browsers/browsing-the-web/history-traversal/*
+SET TIMEOUT: html/browsers/browsing-the-web/navigating-across-documents/*
+SET TIMEOUT: html/browsers/browsing-the-web/scroll-to-fragid/*
+SET TIMEOUT: html/browsers/browsing-the-web/unloading-documents/*
+SET TIMEOUT: html/browsers/history/the-history-interface/*
+SET TIMEOUT: html/browsers/history/the-location-interface/*
+SET TIMEOUT: html/browsers/history/the-session-history-of-browsing-contexts/*
+SET TIMEOUT: html/browsers/offline/*
+SET TIMEOUT: html/browsers/the-window-object/*
+SET TIMEOUT: html/cross-origin-opener-policy/resources/fully-loaded.js
+SET TIMEOUT: html/editing/dnd/*
+SET TIMEOUT: html/semantics/embedded-content/media-elements/track/track-element/crashtests/*
+SET TIMEOUT: html/semantics/embedded-content/the-iframe-element/*
+SET TIMEOUT: html/semantics/embedded-content/the-img-element/*
+SET TIMEOUT: html/semantics/embedded-content/the-object-element/object-param-url.html
+SET TIMEOUT: html/semantics/embedded-content/the-object-element/object-param-url-ref.html
+SET TIMEOUT: html/semantics/forms/textfieldselection/select-event.html
+SET TIMEOUT: html/semantics/scripting-1/the-script-element/*
+SET TIMEOUT: html/webappapis/dynamic-markup-insertion/opening-the-input-stream/0*
+SET TIMEOUT: html/webappapis/dynamic-markup-insertion/opening-the-input-stream/resources/history-frame.html
+SET TIMEOUT: html/webappapis/dynamic-markup-insertion/opening-the-input-stream/resources/url-entry-document-timer-frame.html
+SET TIMEOUT: html/webappapis/dynamic-markup-insertion/opening-the-input-stream/tasks.window.js
+SET TIMEOUT: html/webappapis/scripting/event-loops/*
+SET TIMEOUT: html/webappapis/scripting/events/event-handler-processing-algorithm-error/*
+SET TIMEOUT: html/webappapis/scripting/processing-model-2/*
+SET TIMEOUT: IndexedDB/*
+SET TIMEOUT: infrastructure/*
+SET TIMEOUT: intersection-observer/resources/*
+SET TIMEOUT: intersection-observer/target-in-different-window.html
+SET TIMEOUT: js-self-profiling/resources/profiling-script.js
+SET TIMEOUT: measure-memory/*
+SET TIMEOUT: media-source/mediasource-util.js
+SET TIMEOUT: media-source/URL-createObjectURL-revoke.html
+SET TIMEOUT: mixed-content/generic/sanity-checker.js
+SET TIMEOUT: navigation-api/navigation-history-entry/entries-after-bfcache-in-iframe.html
+SET TIMEOUT: navigation-timing/*
+SET TIMEOUT: old-tests/submission/Microsoft/history/history_000.htm
+SET TIMEOUT: paint-timing/resources/subframe-painting.html
+SET TIMEOUT: performance-timeline/resources/navigation-id-detached-frame-page.html
+SET TIMEOUT: portals/resources/portals-adopt-predecessor-portal.html
+SET TIMEOUT: preload/single-download-preload.html
+SET TIMEOUT: preload/resources/slow-exec.js
+SET TIMEOUT: resize-observer/resources/iframe.html
+SET TIMEOUT: resource-timing/resources/nested-contexts.js
+SET TIMEOUT: reporting/resources/first-csp-report.https.sub.html
+SET TIMEOUT: reporting/resources/second-csp-report.https.sub.html
+SET TIMEOUT: secure-contexts/basic-popup-and-iframe-tests.https.js
+SET TIMEOUT: service-workers/cache-storage/cache-abort.https.any.js
+SET TIMEOUT: service-workers/service-worker/activation.https.html
+SET TIMEOUT: service-workers/service-worker/fetch-frame-resource.https.html
+SET TIMEOUT: service-workers/service-worker/fetch-request-redirect.https.html
+SET TIMEOUT: service-workers/service-worker/fetch-waits-for-activate.https.html
+SET TIMEOUT: service-workers/service-worker/update-recovery.https.html
+SET TIMEOUT: service-workers/service-worker/resources/extendable-event-async-waituntil.js
+SET TIMEOUT: service-workers/service-worker/resources/fetch-event-async-respond-with-worker.js
+SET TIMEOUT: service-workers/service-worker/resources/fetch-event-test-worker.js
+SET TIMEOUT: service-workers/service-worker/resources/opaque-response-being-preloaded-xhr.html
+SET TIMEOUT: service-workers/service-worker/resources/opaque-response-preloaded-xhr.html
+SET TIMEOUT: service-workers/service-worker/resources/performance-timeline-worker.js
+SET TIMEOUT: service-workers/service-worker/resources/resource-timing-worker.js
+SET TIMEOUT: shadow-dom/Document-prototype-currentScript.html
+SET TIMEOUT: shadow-dom/scroll-to-the-fragment-in-shadow-tree.html
+SET TIMEOUT: shadow-dom/slotchange-event.html
+SET TIMEOUT: trusted-types/block-string-assignment-to-DOMWindowTimers-setTimeout-setInterval.tentative.html
+SET TIMEOUT: trusted-types/DOMWindowTimers-setTimeout-setInterval.tentative.html
+SET TIMEOUT: pending-beacon/resources/pending_beacon-helper.js
+SET TIMEOUT: user-timing/*
+SET TIMEOUT: web-animations/crashtests/reparent-animating-element-002.html
+SET TIMEOUT: web-animations/timing-model/animations/*
+SET TIMEOUT: web-locks/crashtests/after-worker-termination.https.html
+SET TIMEOUT: webaudio/the-audio-api/the-mediaelementaudiosourcenode-interface/mediaElementAudioSourceToScriptProcessorTest.html
+SET TIMEOUT: webauthn/*timeout.https.html
+SET TIMEOUT: webdriver/*
+SET TIMEOUT: webmessaging/*
+SET TIMEOUT: webstorage/eventTestHarness.js
+SET TIMEOUT: webvtt/*
+SET TIMEOUT: workers/*
+SET TIMEOUT: xhr/resources/init.htm
+SET TIMEOUT: xhr/resources/xmlhttprequest-timeout.js
+
+# generate_tests implementation and sample usage
+GENERATE_TESTS: resources/test/tests/functional/generate-callback.html
+GENERATE_TESTS: resources/testharness.js
+
+# generate_tests usage (should be got rid of)
+GENERATE_TESTS: html/canvas/element/drawing-images-to-the-canvas/*
+GENERATE_TESTS: html/canvas/element/manual/drawing-images-to-the-canvas/*
+GENERATE_TESTS: css/css-shapes/shape-outside/values/*
+GENERATE_TESTS: css/css-tables/bounding-box-computation-1.html
+GENERATE_TESTS: css/css-tables/bounding-box-computation-2.html
+GENERATE_TESTS: css/css-tables/bounding-box-computation-3.html
+GENERATE_TESTS: css/css-tables/caption-side-1.html
+GENERATE_TESTS: css/css-tables/fixed-layout-1.html
+GENERATE_TESTS: css/css-tables/fixed-layout-2.html
+GENERATE_TESTS: css/css-tables/height-distribution/computing-row-measure-0.html
+GENERATE_TESTS: css/css-tables/height-distribution/computing-row-measure-1.html
+GENERATE_TESTS: css/css-tables/height-distribution/percentage-sizing-of-table-cell-children.html
+GENERATE_TESTS: css/css-tables/html-to-css-mapping-1.html
+GENERATE_TESTS: css/css-tables/html-to-css-mapping-2.html
+GENERATE_TESTS: css/css-tables/html5-table-formatting-1.html
+GENERATE_TESTS: css/css-tables/html5-table-formatting-2.html
+GENERATE_TESTS: css/css-tables/html5-table-formatting-3.html
+GENERATE_TESTS: css/css-tables/html5-table-formatting-fixed-layout-1.html
+GENERATE_TESTS: css/css-tables/table-model-fixup-2.html
+GENERATE_TESTS: css/css-tables/table-model-fixup.html
+GENERATE_TESTS: css/css-tables/visibility-collapse-col-001.html
+GENERATE_TESTS: css/css-tables/visibility-collapse-row-001.html
+GENERATE_TESTS: css/css-tables/width-distribution/computing-column-measure-0.html
+GENERATE_TESTS: css/css-tables/width-distribution/computing-column-measure-1.html
+GENERATE_TESTS: css/css-tables/width-distribution/computing-table-width-0.html
+GENERATE_TESTS: css/css-tables/width-distribution/computing-table-width-1.html
+GENERATE_TESTS: css/css-tables/width-distribution/distribution-algo-1.html
+GENERATE_TESTS: css/css-tables/width-distribution/distribution-algo-2.html
+GENERATE_TESTS: css/css-tables/width-distribution/distribution-algo-min-content-guess.html
+GENERATE_TESTS: css/css-tables/width-distribution/distribution-algo-min-content-percent-guess.html
+GENERATE_TESTS: css/css-tables/width-distribution/distribution-algo-min-content-specified-guess.1.html
+GENERATE_TESTS: css/css-tables/width-distribution/distribution-algo-min-content-specified-guess.html
+GENERATE_TESTS: dom/nodes/case.js
+GENERATE_TESTS: dom/ranges/Range-cloneRange.html
+GENERATE_TESTS: dom/ranges/Range-collapse.html
+GENERATE_TESTS: dom/ranges/Range-mutations.js
+GENERATE_TESTS: dom/ranges/Range-selectNode.html
+GENERATE_TESTS: dom/ranges/Range-set.html
+GENERATE_TESTS: dom/traversal/TreeWalker.html
+GENERATE_TESTS: domparsing/createContextualFragment.html
+GENERATE_TESTS: domxpath/001.html
+GENERATE_TESTS: domxpath/002.html
+GENERATE_TESTS: mediacapture-image/MediaStreamTrack-applyConstraints-reject.https.html
+GENERATE_TESTS: mediacapture-image/MediaStreamTrack-getCapabilities.https.html
+GENERATE_TESTS: mediacapture-image/MediaStreamTrack-getConstraints.https.html
+GENERATE_TESTS: mediacapture-image/MediaStreamTrack-getSettings.https.html
+GENERATE_TESTS: mediacapture-image/takePhoto-reject.html
+GENERATE_TESTS: html/semantics/scripting-1/the-template-element/template-element/template-as-a-descendant.html
+GENERATE_TESTS: html/syntax/parsing/Document.getElementsByTagName-foreign-01.html
+GENERATE_TESTS: html/syntax/parsing/template/clearing-the-stack-back-to-a-given-context/clearing-stack-back-to-a-table-body-context.html
+GENERATE_TESTS: html/syntax/parsing/template/clearing-the-stack-back-to-a-given-context/clearing-stack-back-to-a-table-context.html
+GENERATE_TESTS: html/syntax/parsing/template/clearing-the-stack-back-to-a-given-context/clearing-stack-back-to-a-table-row-context.html
+GENERATE_TESTS: html/syntax/parsing/template/creating-an-element-for-the-token/template-owner-document.html
+GENERATE_TESTS: html/syntax/serializing-html-fragments/serializing.html
+GENERATE_TESTS: html/webappapis/atob/base64.any.js
+GENERATE_TESTS: mediacapture-fromelement/capture.html
+GENERATE_TESTS: mediacapture-fromelement/creation.html
+GENERATE_TESTS: mediacapture-fromelement/ended.html
+GENERATE_TESTS: html/canvas/offscreen/manual/filter/offscreencanvas.filter.html
+GENERATE_TESTS: pointerevents/pointerevent_constructor.html
+GENERATE_TESTS: pointerevents/extension/pointerevent_constructor.html
+GENERATE_TESTS: selection/collapse.js
+GENERATE_TESTS: shadow-dom/leaktests/html-collection.html
+GENERATE_TESTS: shadow-dom/untriaged/shadow-trees/upper-boundary-encapsulation/dom-tree-accessors-001.html
+GENERATE_TESTS: shadow-dom/untriaged/shadow-trees/upper-boundary-encapsulation/ownerdocument-002.html
+GENERATE_TESTS: shadow-dom/untriaged/shadow-trees/upper-boundary-encapsulation/window-named-properties-002.html
+GENERATE_TESTS: shadow-dom/untriaged/shadow-trees/upper-boundary-encapsulation/window-named-properties-003.html
+
+# Intentional use of setTimeout
+SET TIMEOUT: common/security-features/resources/common.sub.js
+SET TIMEOUT: common/dispatcher/dispatcher.js
+SET TIMEOUT: css/css-fonts/font-display/font-display.html
+SET TIMEOUT: css/css-fonts/font-display/font-display-change.html
+SET TIMEOUT: css/css-fonts/font-display/font-display-change-ref.html
+SET TIMEOUT: css/css-fonts/font-display/font-display-feature-policy-01.tentative.html
+SET TIMEOUT: css/css-fonts/font-display/font-display-feature-policy-02.tentative.html
+SET TIMEOUT: css/css-fonts/font-display/font-display-preload.html
+SET TIMEOUT: document-policy/font-display/override-to-optional.tentative.html
+SET TIMEOUT: feature-policy/experimental-features/resources/focus-without-user-activation-iframe-tentative.html
+SET TIMEOUT: permissions-policy/experimental-features/resources/focus-without-user-activation-iframe-tentative.html
+SET TIMEOUT: html/browsers/windows/auxiliary-browsing-contexts/resources/close-opener.html
+SET TIMEOUT: html/cross-origin-embedder-policy/resources/reporting-worker.js
+SET TIMEOUT: html/cross-origin-opener-policy/navigate-to-aboutblank.https.html
+SET TIMEOUT: html/cross-origin-opener-policy/navigate-top-to-aboutblank.https.html
+SET TIMEOUT: html/dom/documents/dom-tree-accessors/Document.currentScript.html
+SET TIMEOUT: html/webappapis/dynamic-markup-insertion/opening-the-input-stream/crbug-583445-regression.window.js
+SET TIMEOUT: html/webappapis/timers/*
+SET TIMEOUT: orientation-event/resources/orientation-event-helpers.js
+SET TIMEOUT: portals/history/resources/portal-harness.js
+SET TIMEOUT: requestidlecallback/deadline-after-expired-timer.html
+SET TIMEOUT: resources/*
+SET TIMEOUT: scheduler/tentative/current-task-signal-async-abort.any.js
+SET TIMEOUT: scheduler/tentative/current-task-signal-async-priority.any.js
+SET TIMEOUT: speculation-rules/prerender/resources/activation-start.html
+SET TIMEOUT: speculation-rules/prerender/resources/prerender-response-code.html
+SET TIMEOUT: speculation-rules/prerender/resources/deferred-promise-utils.js
+SET TIMEOUT: speculation-rules/prerender/resources/session-history-harness.js
+SET TIMEOUT: speculation-rules/prerender/resources/utils.js
+SET TIMEOUT: speculation-rules/prerender/resources/request-picture-in-picture.html
+SET TIMEOUT: speculation-rules/prerender/resources/media-autoplay-attribute.html
+SET TIMEOUT: speculation-rules/prerender/resources/media-play.html
+SET TIMEOUT: html/browsers/browsing-the-web/back-forward-cache/timers.html
+SET TIMEOUT: dom/abort/crashtests/timeout-close.html
+
+# setTimeout use in reftests
+SET TIMEOUT: acid/acid3/test.html
+
+# Third party code
+*: css/tools/apiclient/*
+*: css/tools/w3ctestlib/*
+*: resources/webidl2/*
+*: tools/*
+*: */third_party/*
+
+# .gitignore files in child directories
+*: cors/resources/.gitignore
+*: css/.gitignore
+*: css/css-writing-modes/tools/generators/.gitignore
+*: resources/.gitignore
+*: webaudio/.gitignore
+
+# Build system virtualenv
+*: css/tools/_virtualenv/*
+
+## Third party data files
+TRAILING WHITESPACE: resources/chromium/*
+
+## Test plans and implementation reports
+*: css/*/test-plan/*
+
+## Things we don't have enabled yet
+OPEN-NO-MODE: css/*
+PRINT STATEMENT: css/*
+CONTENT-VISUAL: css/*
+CONTENT-MANUAL: css/*
+
+## Support files not in /support/ or similar
+SUPPORT-WRONG-DIR: css/README.md
+SUPPORT-WRONG-DIR: css/*/reftest.list
+SUPPORT-WRONG-DIR: css/*/README
+SUPPORT-WRONG-DIR: css/*/README.md
+SUPPORT-WRONG-DIR: css/*-README
+SUPPORT-WRONG-DIR: css/*/LICENSE
+SUPPORT-WRONG-DIR: css/*/LICENSE-*
+SUPPORT-WRONG-DIR: css/*/Makefile
+
+# The selectors-3 testsuite has a weird build system
+SUPPORT-WRONG-DIR: css/selectors/*
+
+# Things we should fix
+SUPPORT-WRONG-DIR: css/css-animations/animationevent-interface.js
+SUPPORT-WRONG-DIR: css/css-backgrounds/justfortest.html
+SUPPORT-WRONG-DIR: css/css-backgrounds/background-attachment-local/aqua-yellow-32x32.png
+SUPPORT-WRONG-DIR: css/css-backgrounds/background-clip/list.txt
+SUPPORT-WRONG-DIR: css/css-backgrounds/background-origin/list.txt
+SUPPORT-WRONG-DIR: css/css-color/htaccess
+SUPPORT-WRONG-DIR: css/css-fonts/font-variant-debug.html
+SUPPORT-WRONG-DIR: css/css-masking/clip-path/svg-clipPath.svg
+SUPPORT-WRONG-DIR: css/css-multicol/multicol-red.png
+SUPPORT-WRONG-DIR: css/CSS2/section-index.xht
+SUPPORT-WRONG-DIR: css/CSS2/other-formats/xml/background-18.css
+SUPPORT-WRONG-DIR: css/CSS2/other-formats/xml/background-19-alt.xml
+SUPPORT-WRONG-DIR: css/CSS2/other-formats/xml/background-19.css
+SUPPORT-WRONG-DIR: css/WOFF2/testcaseindex.xht
+
+
+## Whitespace rules that we can't enforce yet
+INDENT TABS: css/compositing/*
+INDENT TABS: css/CSS2/*
+INDENT TABS: css/css-backgrounds/*
+INDENT TABS: css/css-color/*
+INDENT TABS: css/css-conditional/*
+INDENT TABS: css/css-flexbox/*
+INDENT TABS: css/css-fonts/*
+INDENT TABS: css/css-images/support/1x1-green.svg
+INDENT TABS: css/css-masking/*
+INDENT TABS: css/css-multicol/*
+INDENT TABS: css/css-page/*
+INDENT TABS: css/css-round-display/*
+INDENT TABS: css/css-text/*
+INDENT TABS: css/css-text-decor/*
+INDENT TABS: css/css-transforms/*
+INDENT TABS: css/css-ui/*
+INDENT TABS: css/css-values/*
+INDENT TABS: css/css-writing-modes/*
+INDENT TABS: css/filter-effects/*
+INDENT TABS: css/mediaqueries/*
+INDENT TABS: css/selectors/*
+INDENT TABS: css/WOFF2/*
+
+
+## Things we're stopping from getting worse
+CONSOLE: css/css-shapes/shape-outside/supported-shapes/support/test-utils.js
+CONSOLE: css/css-values/viewport-units-css2-001.html
+CONSOLE: css/css-writing-modes/orthogonal-parent-shrink-to-fit-001*.html
+CONSOLE: css/css-writing-modes/tools/generators/gulpfile.js
+
+TRAILING WHITESPACE: css/css-fonts/support/fonts/gsubtest-lookup3.ufo/features.fea
+
+SET TIMEOUT: css/compositing/mix-blend-mode/mix-blend-mode-parent-with-3D-transform-and-transition.html
+SET TIMEOUT: css/compositing/mix-blend-mode/mix-blend-mode-sibling-with-3D-transform-and-transition.html
+SET TIMEOUT: css/css-transitions/events-007.html
+SET TIMEOUT: css/css-transitions/support/generalParallelTest.js
+SET TIMEOUT: css/css-transitions/support/runParallelAsyncHarness.js
+SET TIMEOUT: css/css-transitions/transitioncancel-001.html
+SET TIMEOUT: css/css-values/reference/vh_not_refreshing_on_chrome-ref.html
+SET TIMEOUT: css/css-values/reference/vh_not_refreshing_on_chrome_iframe-ref.html
+SET TIMEOUT: css/css-values/vh_not_refreshing_on_chrome.html
+SET TIMEOUT: css/css-values/support/vh_not_refreshing_on_chrome_iframe.html
+SET TIMEOUT: css/css-writing-modes/orthogonal-parent-shrink-to-fit-001.html
+SET TIMEOUT: css/css-writing-modes/orthogonal-parent-shrink-to-fit-001a.html
+SET TIMEOUT: css/css-writing-modes/orthogonal-parent-shrink-to-fit-001b.html
+SET TIMEOUT: css/css-writing-modes/orthogonal-parent-shrink-to-fit-001c.html
+SET TIMEOUT: css/css-writing-modes/orthogonal-parent-shrink-to-fit-001d.html
+SET TIMEOUT: css/css-writing-modes/orthogonal-parent-shrink-to-fit-001e.html
+SET TIMEOUT: css/css-writing-modes/orthogonal-parent-shrink-to-fit-001f.html
+SET TIMEOUT: css/css-writing-modes/orthogonal-parent-shrink-to-fit-001g.html
+SET TIMEOUT: css/css-writing-modes/orthogonal-parent-shrink-to-fit-001h.html
+SET TIMEOUT: css/css-writing-modes/orthogonal-parent-shrink-to-fit-001i.html
+SET TIMEOUT: css/css-writing-modes/orthogonal-parent-shrink-to-fit-001j.html
+SET TIMEOUT: css/css-writing-modes/orthogonal-parent-shrink-to-fit-001k.html
+SET TIMEOUT: css/css-writing-modes/orthogonal-parent-shrink-to-fit-001l.html
+SET TIMEOUT: css/css-writing-modes/orthogonal-parent-shrink-to-fit-001m.html
+SET TIMEOUT: css/css-writing-modes/orthogonal-parent-shrink-to-fit-001n.html
+SET TIMEOUT: css/css-writing-modes/orthogonal-parent-shrink-to-fit-001o.html
+SET TIMEOUT: css/css-writing-modes/orthogonal-parent-shrink-to-fit-001p.html
+SET TIMEOUT: css/css-writing-modes/orthogonal-parent-shrink-to-fit-001q.html
+SET TIMEOUT: css/css-writing-modes/orthogonal-parent-shrink-to-fit-001r.html
+SET TIMEOUT: css/css-writing-modes/orthogonal-parent-shrink-to-fit-001s.html
+SET TIMEOUT: css/css-writing-modes/orthogonal-parent-shrink-to-fit-001t.html
+SET TIMEOUT: css/css-writing-modes/orthogonal-parent-shrink-to-fit-001u.html
+SET TIMEOUT: css/css-writing-modes/orthogonal-parent-shrink-to-fit-001v.html
+SET TIMEOUT: css/css-writing-modes/orthogonal-parent-shrink-to-fit-001w.html
+SET TIMEOUT: css/css-writing-modes/orthogonal-parent-shrink-to-fit-001x.html
+SET TIMEOUT: css/css-writing-modes/support/text-orientation.js
+SET TIMEOUT: css/CSS2/backgrounds/background-root-101.xht
+SET TIMEOUT: css/CSS2/backgrounds/background-root-102.xht
+SET TIMEOUT: css/CSS2/backgrounds/background-root-103.xht
+SET TIMEOUT: css/CSS2/floats-clear/floats-137.xht
+SET TIMEOUT: css/CSS2/generated-content/counter-increment-000.xht
+SET TIMEOUT: css/CSS2/generated-content/counter-increment-001.xht
+SET TIMEOUT: css/CSS2/generated-content/counter-increment-002.xht
+SET TIMEOUT: css/CSS2/generated-content/counter-reset-000.xht
+SET TIMEOUT: css/CSS2/generated-content/counter-reset-001.xht
+SET TIMEOUT: css/CSS2/generated-content/counter-reset-002.xht
+SET TIMEOUT: css/CSS2/selectors/dom-hover-001.xht
+SET TIMEOUT: css/CSS2/selectors/dom-hover-002.xht
+SET TIMEOUT: css/CSS2/tables/tables-102.xht
+SET TIMEOUT: css/mediaqueries/min-width-tables-001.html
+SET TIMEOUT: css/css-text/crashtests/rendering-rtl-bidi-override-crash.html
+SET TIMEOUT: resource-timing/resources/run-async-tasks-promise.js
+
+## Build system stuff
+CSS-COLLIDING-SUPPORT-NAME: css/*/README
+CSS-COLLIDING-SUPPORT-NAME: css/*/LOCK
+
+# These are all the current "merge mismatch" errors the build system produces
+CSS-COLLIDING-SUPPORT-NAME: css/css-flexbox/support/200x200-green.png
+CSS-COLLIDING-SUPPORT-NAME: css/css-grid/grid-items/support/200x200-green.png
+CSS-COLLIDING-SUPPORT-NAME: css/css-sizing/aspect-ratio/support/200x200-green.png
+CSS-COLLIDING-SUPPORT-NAME: css/css-backgrounds/support/pattern-grg-rgr-grg.png
+CSS-COLLIDING-SUPPORT-NAME: css/css-multicol/support/pattern-grg-rgr-grg.png
+CSS-COLLIDING-SUPPORT-NAME: css/css-transitions/support/pattern-grg-rgr-grg.png
+CSS-COLLIDING-SUPPORT-NAME: css/CSS2/backgrounds/support/pattern-grg-rgr-grg.png
+CSS-COLLIDING-SUPPORT-NAME: css/css-backgrounds/support/pattern-rgr-grg-rgr.png
+CSS-COLLIDING-SUPPORT-NAME: css/css-fonts/support/pattern-rgr-grg-rgr.png
+CSS-COLLIDING-SUPPORT-NAME: css/css-multicol/support/pattern-rgr-grg-rgr.png
+CSS-COLLIDING-SUPPORT-NAME: css/css-page/support/pattern-rgr-grg-rgr.png
+CSS-COLLIDING-SUPPORT-NAME: css/css-transitions/support/pattern-rgr-grg-rgr.png
+CSS-COLLIDING-SUPPORT-NAME: css/CSS2/backgrounds/support/pattern-rgr-grg-rgr.png
+CSS-COLLIDING-SUPPORT-NAME: css/css-flexbox/support/solidblue.png
+CSS-COLLIDING-SUPPORT-NAME: css/css-writing-modes/support/swatch-fuchsia.png
+CSS-COLLIDING-SUPPORT-NAME: css/CSS2/support/swatch-fuchsia.png
+
+# More duplicated copies of the above
+CSS-COLLIDING-SUPPORT-NAME: css/support/pattern-rgr-grg-rgr.png
+CSS-COLLIDING-SUPPORT-NAME: css/CSS2/floats-clear/support/pattern-rgr-grg-rgr.png
+CSS-COLLIDING-SUPPORT-NAME: css/CSS2/media/support/pattern-rgr-grg-rgr.png
+CSS-COLLIDING-SUPPORT-NAME: css/cssom-view/support/pattern-rgr-grg-rgr.png
+CSS-COLLIDING-SUPPORT-NAME: css/CSS2/syntax/support/pattern-rgr-grg-rgr.png
+CSS-COLLIDING-SUPPORT-NAME: css/CSS2/fonts/support/pattern-rgr-grg-rgr.png
+CSS-COLLIDING-SUPPORT-NAME: css/CSS2/cascade/support/pattern-rgr-grg-rgr.png
+CSS-COLLIDING-SUPPORT-NAME: css/css-transforms/support/pattern-rgr-grg-rgr.png
+CSS-COLLIDING-SUPPORT-NAME: css/CSS2/support/pattern-rgr-grg-rgr.png
+CSS-COLLIDING-SUPPORT-NAME: css/cssom/support/pattern-rgr-grg-rgr.png
+CSS-COLLIDING-SUPPORT-NAME: css/css-style-attr/support/pattern-rgr-grg-rgr.png
+CSS-COLLIDING-SUPPORT-NAME: css/CSS2/borders/support/pattern-rgr-grg-rgr.png
+CSS-COLLIDING-SUPPORT-NAME: css/CSS2/zindex/support/pattern-rgr-grg-rgr.png
+CSS-COLLIDING-SUPPORT-NAME: css/CSS2/text/support/pattern-rgr-grg-rgr.png
+CSS-COLLIDING-SUPPORT-NAME: css/css-values/support/pattern-rgr-grg-rgr.png
+CSS-COLLIDING-SUPPORT-NAME: css/CSS2/margin-padding-clear/support/pattern-rgr-grg-rgr.png
+CSS-COLLIDING-SUPPORT-NAME: css/css-text/support/pattern-rgr-grg-rgr.png
+CSS-COLLIDING-SUPPORT-NAME: css/CSS2/box-display/support/pattern-rgr-grg-rgr.png
+CSS-COLLIDING-SUPPORT-NAME: css/CSS2/colors/support/pattern-rgr-grg-rgr.png
+CSS-COLLIDING-SUPPORT-NAME: css/CSS2/lists/support/pattern-rgr-grg-rgr.png
+CSS-COLLIDING-SUPPORT-NAME: css/filter-effects/support/pattern-rgr-grg-rgr.png
+CSS-COLLIDING-SUPPORT-NAME: css/CSS2/selectors/support/pattern-rgr-grg-rgr.png
+CSS-COLLIDING-SUPPORT-NAME: css/CSS2/values/support/pattern-rgr-grg-rgr.png
+CSS-COLLIDING-SUPPORT-NAME: css/css-shapes/support/pattern-rgr-grg-rgr.png
+CSS-COLLIDING-SUPPORT-NAME: css/CSS2/tables/support/pattern-rgr-grg-rgr.png
+CSS-COLLIDING-SUPPORT-NAME: css/CSS2/bidi-text/support/pattern-rgr-grg-rgr.png
+CSS-COLLIDING-SUPPORT-NAME: css/CSS2/css1/support/pattern-rgr-grg-rgr.png
+CSS-COLLIDING-SUPPORT-NAME: css/CSS2/ui/support/pattern-rgr-grg-rgr.png
+CSS-COLLIDING-SUPPORT-NAME: css/CSS2/normal-flow/support/pattern-rgr-grg-rgr.png
+CSS-COLLIDING-SUPPORT-NAME: css/css-images/support/pattern-rgr-grg-rgr.png
+CSS-COLLIDING-SUPPORT-NAME: css/CSS2/generated-content/support/pattern-rgr-grg-rgr.png
+CSS-COLLIDING-SUPPORT-NAME: css/css-flexbox/support/pattern-rgr-grg-rgr.png
+CSS-COLLIDING-SUPPORT-NAME: css/support/pattern-grg-rgr-grg.png
+CSS-COLLIDING-SUPPORT-NAME: css/css-fonts/support/pattern-grg-rgr-grg.png
+CSS-COLLIDING-SUPPORT-NAME: css/css-transforms/support/pattern-grg-rgr-grg.png
+CSS-COLLIDING-SUPPORT-NAME: css/cssom-view/support/pattern-grg-rgr-grg.png
+CSS-COLLIDING-SUPPORT-NAME: css/CSS2/fonts/support/pattern-grg-rgr-grg.png
+CSS-COLLIDING-SUPPORT-NAME: css/CSS2/support/pattern-grg-rgr-grg.png
+CSS-COLLIDING-SUPPORT-NAME: css/CSS2/selectors/support/pattern-grg-rgr-grg.png
+CSS-COLLIDING-SUPPORT-NAME: css/css-shapes/support/pattern-grg-rgr-grg.png
+CSS-COLLIDING-SUPPORT-NAME: css/CSS2/ui/support/pattern-grg-rgr-grg.png
+CSS-COLLIDING-SUPPORT-NAME: css/CSS2/normal-flow/support/pattern-grg-rgr-grg.png
+CSS-COLLIDING-SUPPORT-NAME: css/CSS2/margin-padding-clear/support/pattern-grg-rgr-grg.png
+CSS-COLLIDING-SUPPORT-NAME: css/CSS2/syntax/support/pattern-grg-rgr-grg.png
+CSS-COLLIDING-SUPPORT-NAME: css/CSS2/zindex/support/pattern-grg-rgr-grg.png
+CSS-COLLIDING-SUPPORT-NAME: css/CSS2/colors/support/pattern-grg-rgr-grg.png
+CSS-COLLIDING-SUPPORT-NAME: css/CSS2/cascade/support/pattern-grg-rgr-grg.png
+CSS-COLLIDING-SUPPORT-NAME: css/CSS2/bidi-text/support/pattern-grg-rgr-grg.png
+CSS-COLLIDING-SUPPORT-NAME: css/css-style-attr/support/pattern-grg-rgr-grg.png
+CSS-COLLIDING-SUPPORT-NAME: css/CSS2/lists/support/pattern-grg-rgr-grg.png
+CSS-COLLIDING-SUPPORT-NAME: css/css-flexbox/support/pattern-grg-rgr-grg.png
+CSS-COLLIDING-SUPPORT-NAME: css/filter-effects/support/pattern-grg-rgr-grg.png
+CSS-COLLIDING-SUPPORT-NAME: css/CSS2/borders/support/pattern-grg-rgr-grg.png
+CSS-COLLIDING-SUPPORT-NAME: css/css-text/support/pattern-grg-rgr-grg.png
+CSS-COLLIDING-SUPPORT-NAME: css/CSS2/text/support/pattern-grg-rgr-grg.png
+CSS-COLLIDING-SUPPORT-NAME: css/CSS2/box-display/support/pattern-grg-rgr-grg.png
+CSS-COLLIDING-SUPPORT-NAME: css/CSS2/media/support/pattern-grg-rgr-grg.png
+CSS-COLLIDING-SUPPORT-NAME: css/css-values/support/pattern-grg-rgr-grg.png
+CSS-COLLIDING-SUPPORT-NAME: css/css-page/support/pattern-grg-rgr-grg.png
+CSS-COLLIDING-SUPPORT-NAME: css/cssom/support/pattern-grg-rgr-grg.png
+CSS-COLLIDING-SUPPORT-NAME: css/CSS2/css1/support/pattern-grg-rgr-grg.png
+CSS-COLLIDING-SUPPORT-NAME: css/CSS2/floats-clear/support/pattern-grg-rgr-grg.png
+CSS-COLLIDING-SUPPORT-NAME: css/CSS2/generated-content/support/pattern-grg-rgr-grg.png
+CSS-COLLIDING-SUPPORT-NAME: css/css-images/support/pattern-grg-rgr-grg.png
+CSS-COLLIDING-SUPPORT-NAME: css/CSS2/tables/support/pattern-grg-rgr-grg.png
+CSS-COLLIDING-SUPPORT-NAME: css/CSS2/values/support/pattern-grg-rgr-grg.png
+
+# Duplicate filename not picked up by the build system
+# https:css///github.com/w3c/csswg-test/issues/1236
+CSS-COLLIDING-REF-NAME: css/css-masking/clip-path-svg-content/reference/clip-path-square-001-ref.svg
+CSS-COLLIDING-REF-NAME: css/css-masking/clip-path/reference/clip-path-square-001-ref.html
+CSS-COLLIDING-REF-NAME: css/css-masking/clip-path-svg-content/reference/clip-path-square-002-ref.svg
+CSS-COLLIDING-REF-NAME: css/css-masking/clip-path/reference/clip-path-square-002-ref.html
+
+# Duplicate filename where there's no actual merging
+# (i.e., we're being more aggressive than the build system at forbidding it)
+CSS-COLLIDING-REF-NAME: css/CSS2/text/text-transform-lowercase-001-ref.xht
+CSS-COLLIDING-REF-NAME: css/css-text/text-transform/reference/text-transform-lowercase-001-ref.xht
+CSS-COLLIDING-REF-NAME: css/CSS2/text/text-transform-capitalize-003-ref.xht
+CSS-COLLIDING-REF-NAME: css/css-text/text-transform/reference/text-transform-capitalize-003-ref.html
+CSS-COLLIDING-REF-NAME: css/CSS2/text/text-transform-capitalize-001-ref.xht
+CSS-COLLIDING-REF-NAME: css/css-text/text-transform/reference/text-transform-capitalize-001-ref.html
+CSS-COLLIDING-REF-NAME: css/css-pseudo/first-letter-001-ref.html
+CSS-COLLIDING-REF-NAME: css/CSS2/selectors/first-letter-001-ref.xht
+CSS-COLLIDING-REF-NAME: css/CSS2/text/text-transform-uppercase-001-ref.xht
+CSS-COLLIDING-REF-NAME: css/css-text/text-transform/reference/text-transform-uppercase-001-ref.xht
+CSS-COLLIDING-REF-NAME: css/CSS2/visufx/overflow-applies-to-001-ref.xht
+CSS-COLLIDING-REF-NAME: css/CSS2/ui/overflow-applies-to-001-ref.xht
+CSS-COLLIDING-REF-NAME: css/CSS2/visuren/inline-formatting-context-001-ref.xht
+CSS-COLLIDING-REF-NAME: css/CSS2/linebox/inline-formatting-context-001-ref.xht
+CSS-COLLIDING-REF-NAME: css/css-flexbox/reference/percentage-size-subitems-001-ref.html
+CSS-COLLIDING-REF-NAME: css/css-grid/grid-items/percentage-size-subitems-001-ref.html
+CSS-COLLIDING-SUPPORT-NAME: css/css-backgrounds/support/red.png
+CSS-COLLIDING-SUPPORT-NAME: css/compositing/mix-blend-mode/support/red.png
+CSS-COLLIDING-SUPPORT-NAME: css/compositing/background-blending/support/red.png
+CSS-COLLIDING-SUPPORT-NAME: css/CSS2/normal-flow/support/replaced-min-max-3.png
+CSS-COLLIDING-SUPPORT-NAME: css/css-sizing/support/replaced-min-max-3.png
+CSS-COLLIDING-SUPPORT-NAME: css/css-backgrounds/background-size/support/50x50-green.png
+CSS-COLLIDING-SUPPORT-NAME: css/css-backgrounds/support/50x50-green.png
+CSS-COLLIDING-SUPPORT-NAME: css/css-grid/grid-items/support/50x50-green.png
+CSS-COLLIDING-SUPPORT-NAME: css/CSS2/support/50x50-green.png
+CSS-COLLIDING-SUPPORT-NAME: css/CSS2/ui/support/animated.gif
+CSS-COLLIDING-SUPPORT-NAME: css/css-grid/alignment/support/50x50-green.png
+CSS-COLLIDING-SUPPORT-NAME: css/css-grid/alignment/support/25x50-green.png
+CSS-COLLIDING-SUPPORT-NAME: css/css-grid/grid-items/support/25x50-green.png
+CSS-COLLIDING-SUPPORT-NAME: css/CSS2/backgrounds/support/animated.gif
+CSS-COLLIDING-SUPPORT-NAME: css/css-shapes/shape-outside/shape-image/support/animated.gif
+CSS-COLLIDING-SUPPORT-NAME: css/css-display/support/util.js
+CSS-COLLIDING-SUPPORT-NAME: css/CSS2/normal-flow/support/replaced-min-max-1.png
+CSS-COLLIDING-SUPPORT-NAME: css/css-sizing/support/replaced-min-max-1.png
+CSS-COLLIDING-REF-NAME: css/css-multicol/baseline-001-ref.html
+CSS-COLLIDING-REF-NAME: css/css-grid/subgrid/baseline-001-ref.html
+CSS-COLLIDING-REF-NAME: css/css-backgrounds/simple-bg-color-ref.html
+CSS-COLLIDING-REF-NAME: css/css-backgrounds/hidpi/simple-bg-color-ref.html
+
+CSS-COLLIDING-TEST-NAME: css/css-contain/content-visibility/inheritance.html
+CSS-COLLIDING-TEST-NAME: css/css-contain/inheritance.html
+CSS-COLLIDING-TEST-NAME: css/css-grid/grid-items/replaced-element-001.html
+CSS-COLLIDING-TEST-NAME: css/css-grid/grid-items/replaced-element-002.html
+CSS-COLLIDING-TEST-NAME: css/css-grid/grid-items/replaced-element-007.html
+CSS-COLLIDING-TEST-NAME: css/css-grid/grid-items/replaced-element-010.html
+CSS-COLLIDING-TEST-NAME: css/css-sizing/aspect-ratio/parsing/contain-intrinsic-size-computed.html
+CSS-COLLIDING-TEST-NAME: css/css-sizing/aspect-ratio/parsing/contain-intrinsic-size-invalid.html
+CSS-COLLIDING-TEST-NAME: css/css-sizing/aspect-ratio/parsing/contain-intrinsic-size-valid.html
+CSS-COLLIDING-TEST-NAME: css/css-sizing/aspect-ratio/replaced-element-001.html
+CSS-COLLIDING-TEST-NAME: css/css-sizing/aspect-ratio/replaced-element-002.html
+CSS-COLLIDING-TEST-NAME: css/css-sizing/aspect-ratio/replaced-element-007.html
+CSS-COLLIDING-TEST-NAME: css/css-sizing/aspect-ratio/replaced-element-010.html
+CSS-COLLIDING-TEST-NAME: css/css-sizing/contain-intrinsic-size/parsing/contain-intrinsic-size-computed.html
+CSS-COLLIDING-TEST-NAME: css/css-sizing/contain-intrinsic-size/parsing/contain-intrinsic-size-invalid.html
+CSS-COLLIDING-TEST-NAME: css/css-sizing/contain-intrinsic-size/parsing/contain-intrinsic-size-valid.html
+
+# CSS tests that used to be at the top level and weren't subject to lints
+MISSING-LINK: css/css-fonts/matching/fixed-stretch-style-over-weight.html
+SUPPORT-WRONG-DIR: css/css-fonts/matching/font-matching.css
+MISSING-LINK: css/css-fonts/matching/stretch-distance-over-weight-distance.html
+MISSING-LINK: css/css-fonts/matching/style-ranges-over-weight-direction.html
+MISSING-LINK: css/css-fonts/variations/font-parse-numeric-stretch-style-weight.html
+MISSING-LINK: css/css-fonts/variations/variable-box-font.html
+MISSING-LINK: css/css-fonts/variations/variable-gpos-m2b.html
+MISSING-LINK: css/css-fonts/variations/variable-gsub.html
+MISSING-LINK: css/css-scroll-anchoring/abspos-containing-block-outside-scroller.html
+MISSING-LINK: css/css-scroll-anchoring/abspos-contributes-to-static-parent-bounds.html
+MISSING-LINK: css/css-scroll-anchoring/ancestor-change-heuristic.html
+MISSING-LINK: css/css-scroll-anchoring/anchor-updates-after-explicit-scroll.html
+MISSING-LINK: css/css-scroll-anchoring/anchoring-with-bounds-clamping-div.html
+MISSING-LINK: css/css-scroll-anchoring/anchoring-with-bounds-clamping.html
+MISSING-LINK: css/css-scroll-anchoring/anonymous-block-box.html
+MISSING-LINK: css/css-scroll-anchoring/basic.html
+MISSING-LINK: css/css-scroll-anchoring/clipped-scrollers-skipped.html
+MISSING-LINK: css/css-scroll-anchoring/descend-into-container-with-float.html
+MISSING-LINK: css/css-scroll-anchoring/descend-into-container-with-overflow.html
+MISSING-LINK: css/css-scroll-anchoring/exclude-fixed-position.html
+MISSING-LINK: css/css-scroll-anchoring/inline-block.html
+MISSING-LINK: css/css-scroll-anchoring/negative-layout-overflow.html
+MISSING-LINK: css/css-scroll-anchoring/opt-out.html
+MISSING-LINK: css/css-scroll-anchoring/position-change-heuristic.html
+MISSING-LINK: css/css-scroll-anchoring/start-edge-in-block-layout-direction.html
+MISSING-LINK: css/css-scroll-anchoring/subtree-exclusion.html
+MISSING-LINK: css/css-scroll-anchoring/wrapped-text.html
+SUPPORT-WRONG-DIR: css/css-easing/testcommon.js
+MISSING-LINK: css/css-typed-om/CSSMatrixComponent-DOMMatrix-mutable.html
+MISSING-LINK: css/css-typed-om/declared-styleMap-accepts-inherit.html
+SUPPORT-WRONG-DIR: css/cssom/stylesheet-same-origin.css
+MISSING-LINK: css/cssom-view/DOMRectList.html
+MISSING-LINK: css/cssom-view/elementFromPoint-002.html
+MISSING-LINK: css/cssom-view/elementFromPoint-003.html
+MISSING-LINK: css/cssom-view/elementFromPoint.html
+MISSING-LINK: css/cssom-view/elementScroll.html
+MISSING-LINK: css/cssom-view/elementsFromPoint-iframes.html
+MISSING-LINK: css/cssom-view/elementsFromPoint-invalid-cases.html
+MISSING-LINK: css/cssom-view/elementsFromPoint-shadowroot.html
+MISSING-LINK: css/cssom-view/elementsFromPoint-simple.html
+MISSING-LINK: css/cssom-view/elementsFromPoint-svg.html
+MISSING-LINK: css/cssom-view/elementsFromPoint-table.html
+MISSING-LINK: css/cssom-view/elementsFromPoint.html
+MISSING-LINK: css/cssom-view/historical.html
+MISSING-LINK: css/cssom-view/HTMLBody-ScrollArea_quirksmode.html
+SUPPORT-WRONG-DIR: css/cssom-view/iframe.html
+MISSING-LINK: css/cssom-view/mouseEvent.html
+MISSING-LINK: css/cssom-view/negativeMargins.html
+MISSING-LINK: css/cssom-view/offsetTopLeftInScrollableParent.html
+MISSING-LINK: css/cssom-view/scrolling-no-browsing-context.html
+MISSING-LINK: css/cssom-view/scrolling-quirks-vs-nonquirks.html
+MISSING-LINK: css/cssom-view/scrollingElement.html
+MISSING-LINK: css/cssom-view/scrollIntoView-shadow.html
+MISSING-LINK: css/cssom-view/scrollIntoView-smooth.html
+MISSING-LINK: css/cssom-view/scrollTop-display-change.html
+
+# TODO https://github.com/web-platform-tests/wpt/issues/5770
+MISSING-LINK: css/css-highlight-api/idlharness.window.js
+MISSING-LINK: css/geometry/*.worker.js
+MISSING-LINK: css/geometry/*.any.js
+MISSING-LINK: css/filter-effects/*.any.js
+
+# Tests that use WebKit/Blink testing APIs
+LAYOUTTESTS APIS: import-maps/data-driven/resources/test-helper-iframe.js
+LAYOUTTESTS APIS: resources/chromium/enable-hyperlink-auditing.js
+LAYOUTTESTS APIS: resources/chromium/generic_sensor_mocks.js
+LAYOUTTESTS APIS: resources/chromium/webxr-test.js
+LAYOUTTESTS APIS: webxr/resources/webxr_util.js
+
+# Signed Exchange files have hard-coded URLs in the certUrl field
+WEB-PLATFORM.TEST:signed-exchange/resources/*.sxg
+WEB-PLATFORM.TEST:signed-exchange/resources/generate-test-sxgs.sh
+
+# Web Bundle files have hard-coded URLs
+WEB-PLATFORM.TEST:web-bundle/resources/*.har
+WEB-PLATFORM.TEST:web-bundle/resources/generate-test-wbns.sh
+WEB-PLATFORM.TEST:web-bundle/resources/nested/*.wbn
+WEB-PLATFORM.TEST:web-bundle/resources/wbn/*.wbn
+WEB-PLATFORM.TEST:web-bundle/subresource-loading/*.html
+WEB-PLATFORM.TEST:web-bundle/subresource-loading/resources/*.js
+
+# Tests that depend on resources in /gen/ in Chromium:
+# https://github.com/web-platform-tests/wpt/issues/16455
+# Please consult with ecosystem-infra@chromium.org before adding more.
+MISSING DEPENDENCY: credential-management/support/otpcredential-helper.js
+MISSING DEPENDENCY: credential-management/support/fedcm-mock.js
+MISSING DEPENDENCY: resources/chromium/content-index-helpers.js
+MISSING DEPENDENCY: resources/chromium/contacts_manager_mock.js
+MISSING DEPENDENCY: resources/chromium/web-bluetooth-test.js
+MISSING DEPENDENCY: resources/chromium/webusb-test.js
+MISSING DEPENDENCY: resources/chromium/fake-serial.js
+MISSING DEPENDENCY: resources/chromium/fake-hid.js
+MISSING DEPENDENCY: resources/chromium/generic_sensor_mocks.js
+MISSING DEPENDENCY: resources/chromium/mock-barcodedetection.js
+MISSING DEPENDENCY: resources/chromium/mock-direct-sockets.js
+MISSING DEPENDENCY: resources/chromium/mock-facedetection.js
+MISSING DEPENDENCY: resources/chromium/mock-idle-detection.js
+MISSING DEPENDENCY: resources/chromium/mock-imagecapture.js
+MISSING DEPENDENCY: resources/chromium/mock-managed-config.js
+MISSING DEPENDENCY: resources/chromium/mock-pressure-service.js
+MISSING DEPENDENCY: resources/chromium/mock-subapps.js
+MISSING DEPENDENCY: resources/chromium/mock-textdetection.js
+MISSING DEPENDENCY: resources/chromium/nfc-mock.js
+MISSING DEPENDENCY: resources/chromium/webxr-test.js
+
+# Tests that are false positives for using Ahem as a system font
+AHEM SYSTEM FONT: acid/acid3/test.html
+AHEM SYSTEM FONT: resource-timing/font-timestamps.html
+AHEM SYSTEM FONT: resource-timing/initiator-type/style.html
+AHEM SYSTEM FONT: resource-timing/resources/iframe-reload-TAO.sub.html
+AHEM SYSTEM FONT: html/canvas/element/drawing-text-to-the-canvas/2d.text.measure.fontBoundingBox.ahem.html
+AHEM SYSTEM FONT: css/css-font-loading/fontface-override-descriptors.html
+AHEM SYSTEM FONT: css/css-font-loading/fontface-size-adjust-descriptor.html
+AHEM SYSTEM FONT: css/css-font-loading/fontface-size-adjust-descriptor-ref.html
+AHEM SYSTEM FONT: css/css-fonts/ascent-descent-override.html
+AHEM SYSTEM FONT: css/css-fonts/font-size-adjust-012.html
+AHEM SYSTEM FONT: css/css-fonts/font-size-adjust-012-ref.html
+AHEM SYSTEM FONT: css/css-fonts/line-gap-override.html
+AHEM SYSTEM FONT: html/dom/render-blocking/remove-attr-unblocks-rendering.optional.html
+AHEM SYSTEM FONT: html/dom/render-blocking/remove-element-unblocks-rendering.optional.html
+
+# TODO: The following should be deleted along with the Ahem web font cleanup
+# PR (https://github.com/web-platform-tests/wpt/pull/18702)
+AHEM SYSTEM FONT: infrastructure/assumptions/ahem-ref.html
+AHEM SYSTEM FONT: infrastructure/assumptions/ahem.html
+
+# Existing crashtests using testharness
+TESTHARNESS-IN-OTHER-TYPE: accessibility/crashtests/computed-node-checked.html
+TESTHARNESS-IN-OTHER-TYPE: html/canvas/element/manual/wide-gamut-canvas/imagedata-no-color-settings-crash.html
+TESTHARNESS-IN-OTHER-TYPE: css/CSS2/floats-clear/adjoining-float-new-fc-crash.html
+TESTHARNESS-IN-OTHER-TYPE: css/CSS2/floats/floats-saturated-position-crash.html
+TESTHARNESS-IN-OTHER-TYPE: css/CSS2/linebox/video-needs-layout-crash.html
+TESTHARNESS-IN-OTHER-TYPE: css/css-break/break-before-with-no-fragmentation-crash.html
+TESTHARNESS-IN-OTHER-TYPE: css/css-multicol/abspos-in-multicol-with-spanner-crash.html
+TESTHARNESS-IN-OTHER-TYPE: css/css-multicol/extremely-tall-multicol-with-extremely-tall-child-crash.html
+TESTHARNESS-IN-OTHER-TYPE: css/css-multicol/with-custom-layout-on-same-element-crash.https.html
+TESTHARNESS-IN-OTHER-TYPE: css/css-overflow/outline-with-opacity-crash.html
+TESTHARNESS-IN-OTHER-TYPE: css/css-overflow/shrink-to-fit-auto-overflow-relayout-crash.html
+TESTHARNESS-IN-OTHER-TYPE: css/css-position/position-absolute-in-inline-crash.html
+TESTHARNESS-IN-OTHER-TYPE: css/css-pseudo/first-letter-crash.html
+TESTHARNESS-IN-OTHER-TYPE: css/css-pseudo/first-line-first-letter-insert-crash.html
+TESTHARNESS-IN-OTHER-TYPE: css/css-shapes/shape-outside/supported-shapes/polygon/shape-outside-polygon-crash.html
+TESTHARNESS-IN-OTHER-TYPE: css/css-tables/visibility-collapse-colspan-crash.html
+TESTHARNESS-IN-OTHER-TYPE: css/css-tables/visibility-collapse-rowspan-crash.html
+TESTHARNESS-IN-OTHER-TYPE: css/css-text/overflow-wrap/overflow-wrap-break-word-long-crash.html
+TESTHARNESS-IN-OTHER-TYPE: css/css-text/overflow-wrap/overflow-wrap-break-word-white-space-crash.html
+TESTHARNESS-IN-OTHER-TYPE: css/css-text/text-indent/text-indent-long-line-crash.html
+TESTHARNESS-IN-OTHER-TYPE: css/css-text/white-space/nowrap-wbr-and-space-crash.html
+TESTHARNESS-IN-OTHER-TYPE: css/css-text/white-space/pre-line-br-with-whitespace-child-crash.html
+TESTHARNESS-IN-OTHER-TYPE: css/css-text/white-space/pre-with-whitespace-crash.html
+TESTHARNESS-IN-OTHER-TYPE: css/css-writing-modes/bidi-inline-fragment-crash.html
+TESTHARNESS-IN-OTHER-TYPE: dom/svg-insert-crash.html
+TESTHARNESS-IN-OTHER-TYPE: editing/run/first-letter-crossing-engine-boundary-crash.html
+TESTHARNESS-IN-OTHER-TYPE: html/semantics/embedded-content/the-object-element/block-object-with-ruby-crash.html
+TESTHARNESS-IN-OTHER-TYPE: html/semantics/forms/the-input-element/time-datalist-crash.html
+TESTHARNESS-IN-OTHER-TYPE: html/semantics/forms/the-input-element/type-change-file-to-text-crash.html
+TESTHARNESS-IN-OTHER-TYPE: html/semantics/interactive-elements/the-details-element/display-table-with-rt-crash.html
+TESTHARNESS-IN-OTHER-TYPE: html/semantics/interactive-elements/the-summary-element/display-table-with-rt-crash.html
+TESTHARNESS-IN-OTHER-TYPE: html/semantics/text-level-semantics/the-ruby-element/rt-without-ruby-crash.html
+TESTHARNESS-IN-OTHER-TYPE: portals/portals-no-frame-crash.html
+TESTHARNESS-IN-OTHER-TYPE: quirks/table-replaced-descendant-percentage-height-crash.html
+TESTHARNESS-IN-OTHER-TYPE: scroll-animations/scroll-timelines/null-scroll-source-crash.html
+TESTHARNESS-IN-OTHER-TYPE: svg/extensibility/foreignObject/foreign-object-circular-filter-reference-crash.html
+TESTHARNESS-IN-OTHER-TYPE: svg/extensibility/foreignObject/foreign-object-under-clip-path-crash.html
+TESTHARNESS-IN-OTHER-TYPE: svg/extensibility/foreignObject/foreign-object-under-defs-crash.html
+TESTHARNESS-IN-OTHER-TYPE: svg/svg-in-svg/svg-in-svg-circular-filter-reference-crash.html
+
+# Adding the testharnessreport.js script causes the test to never complete.
+MISSING-TESTHARNESSREPORT: accessibility/crashtests/computed-node-checked.html
+
+PRINT STATEMENT: webdriver/tests/print/printcmd.py
+PRINT STATEMENT: webdriver/tests/print/user_prompts.py
+
+DUPLICATE-BASENAME-PATH: acid/acid3/empty.html
+DUPLICATE-BASENAME-PATH: acid/acid3/empty.xml
+DUPLICATE-BASENAME-PATH: dom/nodes/Document-createElement-namespace-tests/*
+DUPLICATE-BASENAME-PATH: dom/nodes/ParentNode-querySelector-All-content.html
+DUPLICATE-BASENAME-PATH: dom/nodes/ParentNode-querySelector-All-content.xht
+DUPLICATE-BASENAME-PATH: svg/struct/reftests/reference/green-100x100.html
+DUPLICATE-BASENAME-PATH: svg/struct/reftests/reference/green-100x100.svg
+
+SET TIMEOUT: mediacapture-insertable-streams/MediaStreamTrackProcessor-video.https.html
+
+CSS-COLLIDING-REF-NAME: css/css-backgrounds/reference/background-image-001-ref.html
+CSS-COLLIDING-REF-NAME: css/css-break/background-image-001-ref.html
+
+# Ported crashtests from Mozilla
+SET TIMEOUT: editing/crashtests/backcolor-in-nested-editing-host-td-from-DOMAttrModified.html
+SET TIMEOUT: editing/crashtests/contenteditable-will-be-blurred-by-focus-event-listener.html
+SET TIMEOUT: editing/crashtests/delete-content-in-no-data-object.html
+SET TIMEOUT: editing/crashtests/designMode-document-will-be-blurred-by-focus-event-listener.html
+SET TIMEOUT: editing/crashtests/indent-outdent-after-closing-editable-dialog-element.html
+SET TIMEOUT: editing/crashtests/inserthtml-after-temporarily-removing-document-element.html
+SET TIMEOUT: editing/crashtests/inserthtml-in-text-adopted-to-other-document.html
+SET TIMEOUT: editing/crashtests/insertorderedlist-in-text-adopted-to-other-document.html
+SET TIMEOUT: editing/crashtests/make-editable-div-inline-and-set-contenteditable-of-input-to-false.html
+SET TIMEOUT: editing/crashtests/outdent-across-svg-boundary.html
+SET TIMEOUT: editing/crashtests/textarea-will-be-blurred-by-focus-event-listener.html
+SET TIMEOUT: mathml/crashtests/mozilla/*
+PARSE-FAILED: mathml/crashtests/mozilla/289180-1.xml
diff --git a/test/wpt/tests/mimesniff/META.yml b/test/wpt/tests/mimesniff/META.yml
new file mode 100644
index 00000000000..fd41c87fad8
--- /dev/null
+++ b/test/wpt/tests/mimesniff/META.yml
@@ -0,0 +1,3 @@
+spec: https://mimesniff.spec.whatwg.org/
+suggested_reviewers:
+  - annevk
diff --git a/test/wpt/tests/mimesniff/README.md b/test/wpt/tests/mimesniff/README.md
new file mode 100644
index 00000000000..4687ccef5dc
--- /dev/null
+++ b/test/wpt/tests/mimesniff/README.md
@@ -0,0 +1,4 @@
+Tests for the [MIME Sniffing Standard](https://mimesniff.spec.whatwg.org/).
+
+Some tests are generated from data files. To update the generated
+tests, run `wpt update-built --include mimesniff`
diff --git a/test/wpt/tests/mimesniff/media/media-sniff.window.js b/test/wpt/tests/mimesniff/media/media-sniff.window.js
new file mode 100644
index 00000000000..8e9bf9a27e8
--- /dev/null
+++ b/test/wpt/tests/mimesniff/media/media-sniff.window.js
@@ -0,0 +1,32 @@
+const tests = {
+  "vectors": [
+    "mp3-raw.mp3",
+    "mp3-with-id3.mp3",
+    "flac.flac",
+    "ogg.ogg",
+    "mp4.mp4",
+    "wav.wav",
+    "webm.webm"
+  ],
+  "contentTypes": [
+    "",
+    "bogus/mime",
+    "application/octet-stream",
+    "text/html",
+    "audio/ogg; codec=vorbis",
+    "application/pdf"
+  ]
+};
+
+tests.vectors.forEach(vector => {
+  tests.contentTypes.forEach(type => {
+    async_test(t => {
+      const element = document.createElement("audio");
+      element.src = "resources/" + vector + "?pipe=header(Content-Type,"+type+")"
+
+      element.addEventListener("error", t.unreached_func("No error expected frorm the HTMLMediaElement"));
+      element.addEventListener("loadedmetadata", t.step_func_done());
+      element.load();
+    }, vector + " loads when served with Content-Type " + type);
+  });
+});
diff --git a/test/wpt/tests/mimesniff/media/resources/flac.flac b/test/wpt/tests/mimesniff/media/resources/flac.flac
new file mode 100644
index 00000000000..747ed382c53
Binary files /dev/null and b/test/wpt/tests/mimesniff/media/resources/flac.flac differ
diff --git a/test/wpt/tests/mimesniff/media/resources/make-vectors.sh b/test/wpt/tests/mimesniff/media/resources/make-vectors.sh
new file mode 100644
index 00000000000..2cc0d463b50
--- /dev/null
+++ b/test/wpt/tests/mimesniff/media/resources/make-vectors.sh
@@ -0,0 +1,10 @@
+#!/bin/sh
+
+INPUT=wav.wav
+sox -V -r 44100 -n -b 8 -c 1 wav.wav synth 0.01 sin 330 vol -6db
+ffmpeg -i $INPUT -write_xing 0 -id3v2_version 0 mp3-raw.mp3
+ffmpeg -i $INPUT mp3-with-id3.mp3
+ffmpeg -i $INPUT flac.flac
+ffmpeg -i $INPUT ogg.ogg
+ffmpeg -i $INPUT mp4.mp4
+ffmpeg -i $INPUT webm.webm
diff --git a/test/wpt/tests/mimesniff/media/resources/mp3-raw.mp3 b/test/wpt/tests/mimesniff/media/resources/mp3-raw.mp3
new file mode 100644
index 00000000000..dcc52405ac4
Binary files /dev/null and b/test/wpt/tests/mimesniff/media/resources/mp3-raw.mp3 differ
diff --git a/test/wpt/tests/mimesniff/media/resources/mp3-with-id3.mp3 b/test/wpt/tests/mimesniff/media/resources/mp3-with-id3.mp3
new file mode 100644
index 00000000000..a6a24512406
Binary files /dev/null and b/test/wpt/tests/mimesniff/media/resources/mp3-with-id3.mp3 differ
diff --git a/test/wpt/tests/mimesniff/media/resources/mp4.mp4 b/test/wpt/tests/mimesniff/media/resources/mp4.mp4
new file mode 100644
index 00000000000..abefb4f71b8
Binary files /dev/null and b/test/wpt/tests/mimesniff/media/resources/mp4.mp4 differ
diff --git a/test/wpt/tests/mimesniff/media/resources/ogg.ogg b/test/wpt/tests/mimesniff/media/resources/ogg.ogg
new file mode 100644
index 00000000000..ba0b18218b3
Binary files /dev/null and b/test/wpt/tests/mimesniff/media/resources/ogg.ogg differ
diff --git a/test/wpt/tests/mimesniff/media/resources/wav.wav b/test/wpt/tests/mimesniff/media/resources/wav.wav
new file mode 100644
index 00000000000..5229388e1ed
Binary files /dev/null and b/test/wpt/tests/mimesniff/media/resources/wav.wav differ
diff --git a/test/wpt/tests/mimesniff/media/resources/webm.webm b/test/wpt/tests/mimesniff/media/resources/webm.webm
new file mode 100644
index 00000000000..32a4af895ac
Binary files /dev/null and b/test/wpt/tests/mimesniff/media/resources/webm.webm differ
diff --git a/test/wpt/tests/mimesniff/mime-types/README.md b/test/wpt/tests/mimesniff/mime-types/README.md
new file mode 100644
index 00000000000..eb5fba0ef00
--- /dev/null
+++ b/test/wpt/tests/mimesniff/mime-types/README.md
@@ -0,0 +1,47 @@
+## MIME types
+
+`resources/mime-types.json` and `resources/generated-mime-types.json` contain MIME type tests. The tests are encoded as a JSON array. String values in the array serve as documentation. All other values are objects with the following fields:
+
+* `input`: The string to be parsed.
+* `output`: Null if parsing resulted in failure and the MIME type record serialized as string otherwise.
+* `navigable`: True if the MIME type can be used for a document to be loaded in a browsing context (i.e., does not result in a download) and omitted otherwise.
+* `encoding`: The encoding that can be extracted from the MIME type or null if no encoding can be extracted, and omitted otherwise.
+
+Note: the object description implies that there tests without `navigable` or `encoding` set.
+
+A wrapper for these JSON MIME type tests needs to take care that not all `input` values can be tested in all entrypoints. Some entrypoints only accept bytes and some have further restrictions. A function such as the one below can be used to differentiate:
+
+```js
+function isByteCompatible(str) {
+  // see https://fetch.spec.whatwg.org/#concept-header-value-normalize
+  if(/^[\u0009\u0020\u000A\u000D]+|[\u0009\u0020\u000A\u000D]+$/.test(str)) {
+    return "header-value-incompatible";
+  }
+
+  for(let i = 0; i < str.length; i++) {
+    const charCode = str.charCodeAt(i);
+    // See https://fetch.spec.whatwg.org/#concept-header-value
+    if(charCode > 0xFF) {
+      return "incompatible";
+    } else if(charCode === 0x00 || charCode === 0x0A || charCode === 0x0D) {
+      return "header-value-incompatible";
+    }
+  }
+  return "compatible";
+}
+```
+
+`resources/generated-mime-types.json` is generated by running `resources/generated-mime-types.py`. Modify the latter to correct the former.
+
+These tests are used by resources in this directory to test various aspects of MIME types.
+
+## MIME type groups
+
+`resources/mime-groups.json` contains MIME type group-membership tests. The tests are encoded as a JSON array. String values in the array serve as documentation. All other values are objects with the following fields:
+
+* `input`: The MIME type to test.
+* `groups`: An array of zero or more groups to which the MIME type belongs.
+
+In order to pass the tests an implementation must treat each MIME type as belonging to the exact set of groups listed, with no additions or omissions.
+
+Note: As MIME type groups are used only while determining the computed MIME type of a resource and are not exposed in any API, no browser-based test harness is available.
diff --git a/test/wpt/tests/mimesniff/mime-types/charset-parameter.window.js b/test/wpt/tests/mimesniff/mime-types/charset-parameter.window.js
new file mode 100644
index 00000000000..923c3a3df0c
--- /dev/null
+++ b/test/wpt/tests/mimesniff/mime-types/charset-parameter.window.js
@@ -0,0 +1,61 @@
+// META: timeout=long
+
+promise_test(() => {
+  // Don't load generated-mime-types.json as none of them are navigable
+  return fetch("resources/mime-types.json").then(res => res.json().then(runTests));
+}, "Loading data…");
+
+function isByteCompatible(str) {
+  // see https://fetch.spec.whatwg.org/#concept-header-value-normalize
+  if(/^[\u0009\u0020\u000A\u000D]+|[\u0009\u0020\u000A\u000D]+$/.test(str)) {
+    return "header-value-incompatible";
+  }
+
+  for(let i = 0; i < str.length; i++) {
+    const charCode = str.charCodeAt(i);
+    // See https://fetch.spec.whatwg.org/#concept-header-value
+    if(charCode > 0xFF) {
+      return "incompatible";
+    } else if(charCode === 0x00 || charCode === 0x0A || charCode === 0x0D) {
+      return "header-value-error";
+    }
+  }
+  return "compatible";
+}
+
+function encodeForURL(str) {
+  let output = "";
+  for(let i = 0; i < str.length; i++) {
+    const char = str.charCodeAt(i);
+    if(char > 0xFF) {
+      throw new Error("We cannot deal with input that is not latin1");
+    } else  {
+      output += "%" + char.toString(16).padStart(2, "0");
+    }
+  }
+  return output;
+}
+
+function runTests(tests) {
+  tests.forEach(val => {
+    if(typeof val === "string" || val.navigable === undefined || val.encoding === undefined || isByteCompatible(val.input) !== "compatible") {
+      return;
+    }
+    const mime = val.input;
+    async_test(t => {
+      const frame = document.createElement("iframe"),
+            expectedEncoding = val.encoding === null ? "UTF-8" : val.encoding;
+      t.add_cleanup(() => frame.remove());
+      frame.onload = t.step_func(() => {
+        if(frame.contentWindow.location.href === "about:blank") {
+          return;
+        }
+        // Edge fails all these tests due to not using the correct encoding label.
+        assert_equals(frame.contentDocument.characterSet, expectedEncoding);
+        t.done();
+      });
+      frame.src = "resources/mime-charset.py?type=" + encodeForURL(mime);
+      document.body.appendChild(frame);
+    }, mime);
+  });
+}
diff --git a/test/wpt/tests/mimesniff/mime-types/resources/generated-mime-types.py b/test/wpt/tests/mimesniff/mime-types/resources/generated-mime-types.py
new file mode 100644
index 00000000000..5d0e26c8b8d
--- /dev/null
+++ b/test/wpt/tests/mimesniff/mime-types/resources/generated-mime-types.py
@@ -0,0 +1,48 @@
+import json
+import os
+
+here = os.path.dirname(__file__)
+
+def isHTTPTokenCodePoint(cp):
+    if cp in (0x21, 0x23, 0x24, 0x25, 0x26, 0x27, 0x2A, 0x2B, 0x2D, 0x2E, 0x5E, 0x5F, 0x60, 0x7C, 0x7E) or (cp >= 0x30 and cp <= 0x39) or (cp >= 0x41 and cp <= 0x5A) or (cp >= 0x61 and cp <= 0x7A):
+        return True
+    else:
+        return False
+
+def isHTTPQuotedStringTokenCodePoint(cp):
+    if cp == 0x09 or (cp >= 0x20 and cp <= 0x7E) or (cp >= 0x80 and cp <= 0xFF):
+        return True
+    else:
+        return False
+
+tests = []
+
+for cp in range(0x00, 0x100):
+    if isHTTPTokenCodePoint(cp):
+        continue
+    for scenario in ("type", "subtype", "name", "value"):
+        if scenario == "type" or scenario == "subtype":
+            if cp == 0x2F: # /
+                continue
+            if scenario == "type":
+                test = chr(cp) + "/x"
+            else:
+                test = "x/" + chr(cp)
+            tests.append({"input": test, "output": None})
+        elif scenario == "name":
+            if cp == 0x3B or cp == 0x3D: # ; =
+                continue
+            tests.append({"input": "x/x;" + chr(cp) + "=x;bonus=x", "output": "x/x;bonus=x"})
+        elif scenario == "value":
+            if cp == 0x09 or cp == 0x20 or cp == 0x22 or cp == 0x3B or cp == 0x5C: # TAB SP " ; \
+                continue
+            if isHTTPQuotedStringTokenCodePoint(cp):
+                testOutput = "x/x;x=\"" + chr(cp) + "\";bonus=x"
+            else:
+                testOutput = "x/x;bonus=x"
+            tests.append({"input": "x/x;x=" + chr(cp) + ";bonus=x", "output": testOutput})
+            tests.append({"input": "x/x;x=\"" + chr(cp) + "\";bonus=x", "output": testOutput})
+
+handle = open(os.path.join(here, "generated-mime-types.json"), "w")
+handle.write(json.dumps(tests, indent=2, separators=(',', ': ')))
+handle.write("\n")
diff --git a/test/wpt/tests/mimesniff/mime-types/resources/mime-charset.py b/test/wpt/tests/mimesniff/mime-types/resources/mime-charset.py
new file mode 100644
index 00000000000..bcc3dc3a838
--- /dev/null
+++ b/test/wpt/tests/mimesniff/mime-types/resources/mime-charset.py
@@ -0,0 +1,19 @@
+from wptserve.utils import isomorphic_encode
+
+def main(request, response):
+    content = b"<meta charset=utf-8>\n<script>document.write(document.characterSet)</script>"
+
+    # This uses the following rather than
+    #   response.headers.set("Content-Type", request.GET.first("type"));
+    #   response.content = content
+    # to work around https://github.com/web-platform-tests/wpt/issues/8372.
+
+    response.add_required_headers = False
+    output = b"HTTP/1.1 200 OK\r\n"
+    output += b"Content-Length: " + isomorphic_encode(str(len(content))) + b"\r\n"
+    output += b"Content-Type: " + request.GET.first(b"type") + b"\r\n"
+    output += b"Connection: close\r\n"
+    output += b"\r\n"
+    output += content
+    response.writer.write(output)
+    response.close_connection = True
diff --git a/test/wpt/tests/mimesniff/mime-types/resources/mime-groups.json b/test/wpt/tests/mimesniff/mime-types/resources/mime-groups.json
new file mode 100644
index 00000000000..1b5d7d54f88
--- /dev/null
+++ b/test/wpt/tests/mimesniff/mime-types/resources/mime-groups.json
@@ -0,0 +1,159 @@
+[
+    {"input": "x/x",                               "groups": []},
+    {"input": "image/x",                           "groups": ["image"]},
+    {"input": "audio/x",                           "groups": ["audio or video"]},
+    {"input": "video/x",                           "groups": ["audio or video"]},
+    {"input": "application/ogg",                   "groups": ["audio or video"]},
+    {"input": "application/ogg;x=x",               "groups": ["audio or video"]},
+    {"input": "font/x",                            "groups": ["font"]},
+    {"input": "application/font-cff",              "groups": ["font"]},
+    {"input": "application/font-cff;x=x",          "groups": ["font"]},
+    {"input": "application/font-off",              "groups": ["font"]},
+    {"input": "application/font-off;x=x",          "groups": ["font"]},
+    {"input": "application/font-sfnt",             "groups": ["font"]},
+    {"input": "application/font-sfnt;x=x",         "groups": ["font"]},
+    {"input": "application/font-ttf",              "groups": ["font"]},
+    {"input": "application/font-ttf;x=x",          "groups": ["font"]},
+    {"input": "application/font-woff",             "groups": ["font"]},
+    {"input": "application/font-woff;x=x",         "groups": ["font"]},
+    {"input": "application/vnd.ms-fontobject",     "groups": ["font"]},
+    {"input": "application/vnd.ms-fontobject;x=x", "groups": ["font"]},
+    {"input": "application/vnd.ms-opentype",       "groups": ["font"]},
+    {"input": "application/vnd.ms-opentype;x=x",   "groups": ["font"]},
+    {"input": "x/x+zip",                           "groups": ["ZIP-based"]},
+    {"input": "x/x+zip;x=x",                       "groups": ["ZIP-based"]},
+    {"input": "x/+zip",                            "groups": ["ZIP-based"]},
+    {"input": "x/+zip;x=x",                        "groups": ["ZIP-based"]},
+    "application/zip also matches the archive group",
+    {"input": "application/zip",                   "groups": ["ZIP-based", "archive"]},
+    {"input": "application/zip;x=x",               "groups": ["ZIP-based", "archive"]},
+    {"input": "application/x-rar-compressed",      "groups": ["archive"]},
+    {"input": "application/x-rar-compressed;x=x",  "groups": ["archive"]},
+    {"input": "application/x-gzip",                "groups": ["archive"]},
+    {"input": "application/x-gzip;x=x",            "groups": ["archive"]},
+    "XML is also scriptable",
+    {"input": "x/x+xml",                           "groups": ["XML", "scriptable"]},
+    {"input": "x/x+xml;x=x",                       "groups": ["XML", "scriptable"]},
+    {"input": "x/+xml",                            "groups": ["XML", "scriptable"]},
+    {"input": "x/+xml;x=x",                        "groups": ["XML", "scriptable"]},
+    {"input": "application/xml",                   "groups": ["XML", "scriptable"]},
+    {"input": "application/xml;x=x",               "groups": ["XML", "scriptable"]},
+    {"input": "text/xml",                          "groups": ["XML", "scriptable"]},
+    {"input": "text/xml;x=x",                      "groups": ["XML", "scriptable"]},
+    "HTML is scriptable",
+    {"input": "text/html",                         "groups": ["HTML", "scriptable"]},
+    {"input": "text/html;x=x",                     "groups": ["HTML", "scriptable"]},
+    "PDF is scriptable",
+    {"input": "application/pdf",                   "groups": ["scriptable"]},
+    {"input": "application/pdf;x=x",               "groups": ["scriptable"]},
+    {"input": "application/ecmascript",            "groups": ["JavaScript"]},
+    {"input": "application/ecmascript;x=x",        "groups": ["JavaScript"]},
+    {"input": "application/javascript",            "groups": ["JavaScript"]},
+    {"input": "application/javascript;x=x",        "groups": ["JavaScript"]},
+    {"input": "application/x-ecmascript",          "groups": ["JavaScript"]},
+    {"input": "application/x-ecmascript;x=x",      "groups": ["JavaScript"]},
+    {"input": "application/x-javascript",          "groups": ["JavaScript"]},
+    {"input": "application/x-javascript;x=x",      "groups": ["JavaScript"]},
+    {"input": "text/ecmascript",                   "groups": ["JavaScript"]},
+    {"input": "text/ecmascript;x=x",               "groups": ["JavaScript"]},
+    {"input": "text/javascript",                   "groups": ["JavaScript"]},
+    {"input": "text/javascript;x=x",               "groups": ["JavaScript"]},
+    {"input": "text/javascript1.0",                "groups": ["JavaScript"]},
+    {"input": "text/javascript1.0;x=x",            "groups": ["JavaScript"]},
+    {"input": "text/javascript1.1",                "groups": ["JavaScript"]},
+    {"input": "text/javascript1.1;x=x",            "groups": ["JavaScript"]},
+    {"input": "text/javascript1.2",                "groups": ["JavaScript"]},
+    {"input": "text/javascript1.2;x=x",            "groups": ["JavaScript"]},
+    {"input": "text/javascript1.3",                "groups": ["JavaScript"]},
+    {"input": "text/javascript1.3;x=x",            "groups": ["JavaScript"]},
+    {"input": "text/javascript1.4",                "groups": ["JavaScript"]},
+    {"input": "text/javascript1.4;x=x",            "groups": ["JavaScript"]},
+    {"input": "text/javascript1.5",                "groups": ["JavaScript"]},
+    {"input": "text/javascript1.5;x=x",            "groups": ["JavaScript"]},
+    {"input": "text/jscript",                      "groups": ["JavaScript"]},
+    {"input": "text/jscript;x=x",                  "groups": ["JavaScript"]},
+    {"input": "text/livescript",                   "groups": ["JavaScript"]},
+    {"input": "text/livescript;x=x",               "groups": ["JavaScript"]},
+    {"input": "text/x-ecmascript",                 "groups": ["JavaScript"]},
+    {"input": "text/x-ecmascript;x=x",             "groups": ["JavaScript"]},
+    {"input": "text/x-javascript",                 "groups": ["JavaScript"]},
+    {"input": "text/x-javascript;x=x",             "groups": ["JavaScript"]},
+    {"input": "x/x+json",                          "groups": ["JSON"]},
+    {"input": "x/x+json;x=x",                      "groups": ["JSON"]},
+    {"input": "x/+json",                           "groups": ["JSON"]},
+    {"input": "x/+json;x=x",                       "groups": ["JSON"]},
+    {"input": "application/json",                  "groups": ["JSON"]},
+    {"input": "application/json;x=x",              "groups": ["JSON"]},
+    {"input": "text/json",                         "groups": ["JSON"]},
+    {"input": "text/json;x=x",                     "groups": ["JSON"]},
+    {"input": "x/x;type=image",                    "groups": []},
+    {"input": "x/x;type=audio",                    "groups": []},
+    {"input": "x/x;type=video",                    "groups": []},
+    {"input": "x/x;type=font",                     "groups": []},
+    {"input": "ximage/x",                          "groups": []},
+    {"input": "xaudio/x",                          "groups": []},
+    {"input": "xvideo/x",                          "groups": []},
+    {"input": "xfont/x",                           "groups": []},
+    {"input": "imagex/x",                          "groups": []},
+    {"input": "audiox/x",                          "groups": []},
+    {"input": "videox/x",                          "groups": []},
+    {"input": "fontx/x",                           "groups": []},
+    {"input": "x/image",                           "groups": []},
+    {"input": "x/png",                             "groups": []},
+    {"input": "x/audio",                           "groups": []},
+    {"input": "x/video",                           "groups": []},
+    {"input": "x/ogg",                             "groups": []},
+    {"input": "x/font",                            "groups": []},
+    {"input": "x/woff",                            "groups": []},
+    {"input": "x/font-ttf",                        "groups": []},
+    {"input": "x/x;x=\"application/font-ttf\"",    "groups": []},
+    {"input": "x/zip",                             "groups": []},
+    {"input": "x/x-gzip",                          "groups": []},
+    {"input": "x/x-rar-compressed",                "groups": []},
+    {"input": "x/x;x=\"application/x-gip\"",       "groups": []},
+    {"input": "x+zip/x",                           "groups": []},
+    {"input": "x/x;x=x+zip",                       "groups": []},
+    {"input": "x/x;subtype=x+zip",                 "groups": []},
+    {"input": "x/xml",                             "groups": []},
+    {"input": "x/x;x=\"application/xml\"",         "groups": []},
+    {"input": "x+xml/x",                           "groups": []},
+    {"input": "x/x;x=x+xml",                       "groups": []},
+    {"input": "x/x;subtype=x+xml",                 "groups": []},
+    {"input": "x/pdf",                             "groups": []},
+    {"input": "x/html",                            "groups": []},
+    {"input": "x/ecmascript",                      "groups": []},
+    {"input": "x/javascript",                      "groups": []},
+    {"input": "x/x-ecmascript",                    "groups": []},
+    {"input": "x/x-javascript",                    "groups": []},
+    {"input": "x/jscript",                         "groups": []},
+    {"input": "x/livescript",                      "groups": []},
+    {"input": "x/javascript1.0",                   "groups": []},
+    {"input": "x/javascript1.1",                   "groups": []},
+    {"input": "x/javascript1.2",                   "groups": []},
+    {"input": "x/javascript1.3",                   "groups": []},
+    {"input": "x/javascript1.4",                   "groups": []},
+    {"input": "x/javascript1.5",                   "groups": []},
+    {"input": "x/x;x=\"application/javascript\"",  "groups": []},
+    {"input": "x/json",                            "groups": []},
+    {"input": "x/x;x=\"application/json\"",        "groups": []},
+    {"input": "x+json/x",                          "groups": []},
+    {"input": "x/x;x=x+json",                      "groups": []},
+    {"input": "x/x;subtype=x+json",                "groups": []},
+    {"input": "image/png",                         "groups": ["image"]},
+    {"input": "audio/mp4",                         "groups": ["audio or video"]},
+    {"input": "video/mpeg",                        "groups": ["audio or video"]},
+    {"input": "font/woff",                         "groups": ["font"]},
+    "SVG is both image and XML, thus also scriptable",
+    {"input": "image/svg+xml",                     "groups": ["image", "XML", "scriptable"]},
+    "Hypothetical SVG font type",
+    {"input": "font/svg+xml",                      "groups": ["font", "XML", "scriptable"]},
+    "XHTML is not considered HTML",
+    {"input": "application/xhtml+xml",             "groups": ["XML", "scriptable"]},
+    "Subtype longer than 255",
+    {"input": "x/01234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789+zip",
+                                                   "groups": ["ZIP-based"]},
+    {"input": "x/01234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789+xml",
+                                                   "groups": ["XML", "scriptable"]},
+    {"input": "x/01234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789+json",
+                                                   "groups": ["JSON"]}
+]
diff --git a/test/wpt/tests/resources/.htaccess b/test/wpt/tests/resources/.htaccess
new file mode 100644
index 00000000000..fd46101ca00
--- /dev/null
+++ b/test/wpt/tests/resources/.htaccess
@@ -0,0 +1,2 @@
+# make tests that use utf-16 not inherit the encoding for testharness.js et. al.
+AddCharset utf-8 .css .js
diff --git a/test/wpt/tests/resources/META.yml b/test/wpt/tests/resources/META.yml
new file mode 100644
index 00000000000..64a240ccbe8
--- /dev/null
+++ b/test/wpt/tests/resources/META.yml
@@ -0,0 +1,2 @@
+suggested_reviewers:
+  - jgraham
diff --git a/test/wpt/tests/resources/SVGAnimationTestCase-testharness.js b/test/wpt/tests/resources/SVGAnimationTestCase-testharness.js
new file mode 100644
index 00000000000..9ebaf680392
--- /dev/null
+++ b/test/wpt/tests/resources/SVGAnimationTestCase-testharness.js
@@ -0,0 +1,102 @@
+// NOTE(edvardt):
+// This file is a slimmed down wrapper for the old SVGAnimationTestCase.js,
+// it has some convenience functions and should not be used for new tests.
+// New tests should not build on this API as it's just meant to keep things
+// working.
+
+// Helper functions
+const xlinkNS = "http://www.w3.org/1999/xlink"
+
+function expectFillColor(element, red, green, blue, message) {
+    let color = window.getComputedStyle(element, null).fill;
+    var re = new RegExp("rgba?\\(([^, ]*), ([^, ]*), ([^, ]*)(?:, )?([^, ]*)\\)");
+    rgb = re.exec(color);
+
+    assert_approx_equals(Number(rgb[1]), red, 2.0, message);
+    assert_approx_equals(Number(rgb[2]), green, 2.0, message);
+    assert_approx_equals(Number(rgb[3]), blue, 2.0, message);
+}
+
+function expectColor(element, red, green, blue, property) {
+    if (typeof property != "string")
+      color = getComputedStyle(element).getPropertyValue("color");
+    else
+      color = getComputedStyle(element).getPropertyValue(property);
+    var re = new RegExp("rgba?\\(([^, ]*), ([^, ]*), ([^, ]*)(?:, )?([^, ]*)\\)");
+    rgb = re.exec(color);
+    assert_approx_equals(Number(rgb[1]), red, 2.0);
+    assert_approx_equals(Number(rgb[2]), green, 2.0);
+    assert_approx_equals(Number(rgb[3]), blue, 2.0);
+}
+
+function createSVGElement(type) {
+  return document.createElementNS("http://www.w3.org/2000/svg", type);
+}
+
+// Inspired by Layoutests/animations/animation-test-helpers.js
+function moveAnimationTimelineAndSample(index) {
+    var animationId = expectedResults[index][0];
+    var time = expectedResults[index][1];
+    var sampleCallback = expectedResults[index][2];
+    var animation = rootSVGElement.ownerDocument.getElementById(animationId);
+
+    // If we want to sample the animation end, add a small delta, to reliable point past the end of the animation.
+    newTime = time;
+
+    // The sample time is relative to the start time of the animation, take that into account.
+    rootSVGElement.setCurrentTime(newTime);
+
+    // NOTE(edvardt):
+    // This is a dumb hack, some of the old tests sampled before the animation start, this
+    // isn't technically part of the animation tests and is "impossible" to translate since
+    // tests start automatically. Thus I solved it by skipping it.
+    if (time != 0.0)
+        sampleCallback();
+}
+
+var currentTest = 0;
+var expectedResults;
+
+function sampleAnimation(t) {
+    if (currentTest == expectedResults.length) {
+        t.done();
+        return;
+    }
+
+    moveAnimationTimelineAndSample(currentTest);
+    ++currentTest;
+
+    step_timeout(t.step_func(function () { sampleAnimation(t); }), 0);
+}
+
+function runAnimationTest(t, expected) {
+    if (!expected)
+        throw("Expected results are missing!");
+    if (currentTest > 0)
+        throw("Not allowed to call runAnimationTest() twice");
+
+    expectedResults = expected;
+    testCount = expectedResults.length;
+    currentTest = 0;
+
+    step_timeout(t.step_func(function () { sampleAnimation(this); }), 50);
+}
+
+function smil_async_test(func) {
+  async_test(t => {
+    window.onload = t.step_func(function () {
+      // Pause animations, we'll drive them manually.
+      // This also ensures that the timeline is paused before
+      // it starts. This should make the instance time of the below
+      // 'click' (for instance) 0, and hence minimize rounding
+      // errors for the addition in moveAnimationTimelineAndSample.
+      rootSVGElement.pauseAnimations();
+
+      // If eg. an animation is running with begin="0s", and
+      // we want to sample the first time, before the animation
+      // starts, then we can't delay the testing by using an
+      // onclick event, as the animation would be past start time.
+      func(t);
+    });
+  });
+}
diff --git a/test/wpt/tests/resources/accesskey.js b/test/wpt/tests/resources/accesskey.js
new file mode 100644
index 00000000000..e95c9d21e58
--- /dev/null
+++ b/test/wpt/tests/resources/accesskey.js
@@ -0,0 +1,34 @@
+/*
+ * Function that sends an accesskey using the proper key combination depending on the browser and OS.
+ *
+ * This needs that the test imports the following scripts:
+ *     <script src="/resources/testdriver.js"></script>
+ *     <script src="/resources/testdriver-actions.js"></script>
+ *     <script src="/resources/testdriver-vendor.js"></script>
+*/
+function pressAccessKey(accessKey){
+  let controlKey = '\uE009'; // left Control key
+  let altKey = '\uE00A'; // left Alt key
+  let optionKey = altKey;  // left Option key
+  let shiftKey = '\uE008'; // left Shift key
+  // There are differences in using accesskey across browsers and OS's.
+  // See: // https://developer.mozilla.org/en-US/docs/Web/HTML/Global_attributes/accesskey
+  let isMacOSX = navigator.userAgent.indexOf("Mac") != -1;
+  let osAccessKey = isMacOSX ? [controlKey, optionKey] : [shiftKey, altKey];
+  let actions = new test_driver.Actions();
+  // Press keys.
+  for (let key of osAccessKey) {
+    actions = actions.keyDown(key);
+  }
+  actions = actions
+            .keyDown(accessKey)
+            .addTick()
+            .keyUp(accessKey);
+  osAccessKey.reverse();
+  for (let key of osAccessKey) {
+    actions = actions.keyUp(key);
+  }
+  return actions.send();
+}
+
+
diff --git a/test/wpt/tests/resources/blank.html b/test/wpt/tests/resources/blank.html
new file mode 100644
index 00000000000..edeaa45bb62
--- /dev/null
+++ b/test/wpt/tests/resources/blank.html
@@ -0,0 +1,16 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8" />
+    <title>Blank Page</title>
+    <script>
+      window.onload = function(event) {
+        // This is needed to ensure the onload event fires when this page is
+        // opened as a popup.
+        // See https://github.com/web-platform-tests/wpt/pull/18157
+      };
+    </script>
+  </head>
+  <body>
+  </body>
+</html>
diff --git a/test/wpt/tests/resources/channel.sub.js b/test/wpt/tests/resources/channel.sub.js
new file mode 100644
index 00000000000..370d4f5905e
--- /dev/null
+++ b/test/wpt/tests/resources/channel.sub.js
@@ -0,0 +1,1097 @@
+(function() {
+    function randInt(bits) {
+        if (bits < 1 || bits > 53) {
+            throw new TypeError();
+        } else {
+            if (bits >= 1 && bits <= 30) {
+                return 0 | ((1 << bits) * Math.random());
+            } else {
+                var high = (0 | ((1 << (bits - 30)) * Math.random())) * (1 << 30);
+                var low = 0 | ((1 << 30) * Math.random());
+                return  high + low;
+            }
+        }
+    }
+
+
+    function toHex(x, length) {
+        var rv = x.toString(16);
+        while (rv.length < length) {
+            rv = "0" + rv;
+        }
+        return rv;
+    }
+
+    function createUuid() {
+        return [toHex(randInt(32), 8),
+         toHex(randInt(16), 4),
+         toHex(0x4000 | randInt(12), 4),
+         toHex(0x8000 | randInt(14), 4),
+         toHex(randInt(48), 12)].join("-");
+    }
+
+
+    /**
+     * Cache of WebSocket instances per channel
+     *
+     * For reading there can only be one channel with each UUID, so we
+     * just have a simple map of {uuid: WebSocket}. The socket can be
+     * closed when the channel is closed.
+     *
+     * For writing there can be many channels for each uuid. Those can
+     * share a websocket (within a specific global), so we have a map
+     * of {uuid: [WebSocket, count]}.  Count is incremented when a
+     * channel is opened with a given uuid, and decremented when its
+     * closed. When the count reaches zero we can close the underlying
+     * socket.
+     */
+    class SocketCache {
+        constructor() {
+            this.readSockets = new Map();
+            this.writeSockets = new Map();
+        };
+
+        async getOrCreate(type, uuid, onmessage=null) {
+            function createSocket() {
+                let protocol = self.isSecureContext ? "wss" : "ws";
+                let port = self.isSecureContext? "{{ports[wss][0]}}" : "{{ports[ws][0]}}";
+                let url = `${protocol}://{{host}}:${port}/msg_channel?uuid=${uuid}&direction=${type}`;
+                let socket = new WebSocket(url);
+                if (onmessage !== null) {
+                    socket.onmessage = onmessage;
+                };
+                return new Promise(resolve => socket.addEventListener("open", () => resolve(socket)));
+            }
+
+            let socket;
+            if (type === "read") {
+                if (this.readSockets.has(uuid)) {
+                    throw new Error("Can't create multiple read sockets with same UUID");
+                }
+                socket = await createSocket();
+                // If the socket is closed by the server, ensure it's removed from the cache
+                socket.addEventListener("close", () => this.readSockets.delete(uuid));
+                this.readSockets.set(uuid, socket);
+            } else if (type === "write") {
+                let count;
+                if (onmessage !== null) {
+                    throw new Error("Can't set message handler for write sockets");
+                }
+                if (this.writeSockets.has(uuid)) {
+                    [socket, count] = this.writeSockets.get(uuid);
+                } else {
+                    socket = await createSocket();
+                    count = 0;
+                }
+                count += 1;
+                // If the socket is closed by the server, ensure it's removed from the cache
+                socket.addEventListener("close", () => this.writeSockets.delete(uuid));
+                this.writeSockets.set(uuid, [socket, count]);
+            } else {
+                throw new Error(`Unknown type ${type}`);
+            }
+            return socket;
+        };
+
+        async close(type, uuid) {
+            let target = type === "read" ? this.readSockets : this.writeSockets;
+            const data = target.get(uuid);
+            if (!data) {
+                return;
+            }
+            let count, socket;
+            if (type == "read") {
+                socket = data;
+                count = 0;
+            } else if (type === "write") {
+                [socket, count] = data;
+                count -= 1;
+                if (count > 0) {
+                    target.set(uuid, [socket, count]);
+                }
+            };
+            if (count <= 0 && socket) {
+                target.delete(uuid);
+                socket.close(1000);
+                await new Promise(resolve => socket.addEventListener("close", resolve));
+            }
+        };
+
+        async closeAll() {
+            let sockets = [];
+            this.readSockets.forEach(value => sockets.push(value));
+            this.writeSockets.forEach(value => sockets.push(value[0]));
+            let closePromises = sockets.map(socket =>
+                new Promise(resolve => socket.addEventListener("close", resolve)));
+            sockets.forEach(socket => socket.close(1000));
+            this.readSockets.clear();
+            this.writeSockets.clear();
+            await Promise.all(closePromises);
+        }
+    }
+
+    const socketCache = new SocketCache();
+
+    /**
+     * Abstract base class for objects that allow sending / receiving
+     * messages over a channel.
+     */
+    class Channel {
+        type = null;
+
+        constructor(uuid) {
+            /** UUID for the channel */
+            this.uuid = uuid;
+            this.socket = null;
+            this.eventListeners = {
+                connect: new Set(),
+                close: new Set()
+            };
+        }
+
+        hasConnection() {
+            return this.socket !== null && this.socket.readyState <= WebSocket.OPEN;
+        }
+
+        /**
+         * Connect to the channel.
+         *
+         * @param {Function} onmessage - Event handler function for
+         * the underlying websocket message.
+         */
+        async connect(onmessage) {
+            if (this.hasConnection()) {
+                return;
+            }
+            this.socket = await socketCache.getOrCreate(this.type, this.uuid, onmessage);
+            this._dispatch("connect");
+        }
+
+        /**
+         * Close the channel and underlying websocket connection
+         */
+        async close() {
+            this.socket = null;
+            await socketCache.close(this.type, this.uuid);
+            this._dispatch("close");
+        }
+
+        /**
+         * Add an event callback function. Supported message types are
+         * "connect", "close", and "message" (for ``RecvChannel``).
+         *
+         * @param {string} type - Message type.
+         * @param {Function} fn - Callback function. This is called
+         * with an event-like object, with ``type`` and ``data``
+         * properties.
+         */
+        addEventListener(type, fn) {
+            if (typeof type !== "string") {
+                throw new TypeError(`Expected string, got ${typeof type}`);
+            }
+            if (typeof fn !== "function") {
+                throw new TypeError(`Expected function, got ${typeof fn}`);
+            }
+            if (!this.eventListeners.hasOwnProperty(type)) {
+                throw new Error(`Unrecognised event type ${type}`);
+            }
+            this.eventListeners[type].add(fn);
+        };
+
+        /**
+         * Remove an event callback function.
+         *
+         * @param {string} type - Event type.
+         * @param {Function} fn - Callback function to remove.
+         */
+        removeEventListener(type, fn) {
+            if (!typeof type === "string") {
+                throw new TypeError(`Expected string, got ${typeof type}`);
+            }
+            if (typeof fn !== "function") {
+                throw new TypeError(`Expected function, got ${typeof fn}`);
+            }
+            let listeners = this.eventListeners[type];
+            if (listeners) {
+                listeners.delete(fn);
+            }
+        };
+
+        _dispatch(type, data) {
+            let listeners = this.eventListeners[type];
+            if (listeners) {
+                // If any listener throws we end up not calling the other
+                // listeners. This hopefully makes debugging easier, but
+                // is different to DOM event listeners.
+                listeners.forEach(fn => fn({type, data}));
+            }
+        };
+
+    }
+
+    /**
+     * Send messages over a channel
+     */
+    class SendChannel extends Channel {
+        type = "write";
+
+        /**
+         * Connect to the channel. Automatically called when sending the
+         * first message.
+         */
+        async connect() {
+            return super.connect(null);
+        }
+
+        async _send(cmd, body=null) {
+            if (!this.hasConnection()) {
+                await this.connect();
+            }
+            this.socket.send(JSON.stringify([cmd, body]));
+        }
+
+        /**
+         * Send a message. The message object must be JSON-serializable.
+         *
+         * @param {Object} msg - The message object to send.
+         */
+        async send(msg) {
+            await this._send("message", msg);
+        }
+
+        /**
+         * Disconnect the associated `RecvChannel <#RecvChannel>`_, if
+         * any, on the server side.
+         */
+        async disconnectReader() {
+            await this._send("disconnectReader");
+        }
+
+        /**
+         * Disconnect this channel on the server side.
+         */
+        async delete() {
+            await this._send("delete");
+        }
+    };
+    self.SendChannel = SendChannel;
+
+    const recvChannelsCreated = new Set();
+
+    /**
+     * Receive messages over a channel
+     */
+    class RecvChannel extends Channel {
+        type = "read";
+
+        constructor(uuid) {
+            if (recvChannelsCreated.has(uuid)) {
+                throw new Error(`Already created RecvChannel with id ${uuid}`);
+            }
+            super(uuid);
+            this.eventListeners.message = new Set();
+        }
+
+        async connect() {
+            if (this.hasConnection()) {
+                return;
+            }
+            await super.connect(event => this.readMessage(event.data));
+        }
+
+        readMessage(data) {
+            let msg = JSON.parse(data);
+            this._dispatch("message", msg);
+        }
+
+        /**
+         * Wait for the next message and return it (after passing it to
+         * existing handlers)
+         *
+         * @returns {Promise} - Promise that resolves to the message data.
+         */
+        nextMessage() {
+            return new Promise(resolve => {
+                let fn = ({data}) => {
+                    this.removeEventListener("message", fn);
+                    resolve(data);
+                };
+                this.addEventListener("message", fn);
+            });
+        }
+    }
+
+    /**
+     * Create a new channel pair
+     *
+     * @returns {Array} - Array of [RecvChannel, SendChannel] for the same channel.
+     */
+    self.channel = function() {
+        let uuid = createUuid();
+        let recvChannel = new RecvChannel(uuid);
+        let sendChannel = new SendChannel(uuid);
+        return [recvChannel, sendChannel];
+    };
+
+    /**
+     * Create an unconnected channel defined by a `uuid` in
+     * ``location.href`` for listening for `RemoteGlobal
+     * <#RemoteGlobal>`_ messages.
+     *
+     * @returns {RemoteGlobalCommandRecvChannel} - Disconnected channel
+     */
+    self.global_channel = function() {
+        let uuid = new URLSearchParams(location.search).get("uuid");
+        if (!uuid) {
+            throw new Error("URL must have a uuid parameter to use as a RemoteGlobal");
+        }
+        return new RemoteGlobalCommandRecvChannel(new RecvChannel(uuid));
+    };
+
+    /**
+     * Start listening for `RemoteGlobal <#RemoteGlobal>`_ messages on
+     * a channel defined by a `uuid` in `location.href`
+     *
+     * @returns {RemoteGlobalCommandRecvChannel} - Connected channel
+     */
+    self.start_global_channel = async function() {
+        let channel = self.global_channel();
+        await channel.connect();
+        return channel;
+    };
+
+    /**
+     * Close all WebSockets used by channels in the current realm.
+     *
+     */
+    self.close_all_channel_sockets = async function() {
+        await socketCache.closeAll();
+        // Spinning the event loop after the close events is necessary to
+        // ensure that the channels really are closed and don't affect
+        // bfcache behaviour in at least some implementations.
+        await new Promise(resolve => setTimeout(resolve, 0));
+    };
+
+    /**
+     * Handler for `RemoteGlobal <#RemoteGlobal>`_ commands.
+     *
+     * This can't be constructed directly but must be obtained from
+     * `global_channel() <#global_channel>`_ or
+     * `start_global_channel() <#start_global_channel>`_.
+     */
+    class RemoteGlobalCommandRecvChannel {
+        constructor(recvChannel) {
+            this.channel = recvChannel;
+            this.uuid = recvChannel.uuid;
+            this.channel.addEventListener("message", ({data}) => this.handleMessage(data));
+            this.messageHandlers = new Set();
+        };
+
+        /**
+         * Connect to the channel and start handling messages.
+         */
+        async connect() {
+            await this.channel.connect();
+        }
+
+        /**
+         * Close the channel and underlying websocket connection
+         */
+        async close() {
+            await this.channel.close();
+        }
+
+        async handleMessage(msg) {
+            const {id, command, params, respChannel} = msg;
+            let result = {};
+            let resp = {id, result};
+            if (command === "call") {
+                const fn = deserialize(params.fn);
+                const args = params.args.map(deserialize);
+                try {
+                    let resultValue = await fn(...args);
+                    result.result = serialize(resultValue);
+                } catch(e) {
+                    let exception = serialize(e);
+                    const getAsInt = (obj, prop) =>  {
+                        let value = prop in obj ? parseInt(obj[prop]) : 0;
+                        return Number.isNaN(value) ? 0 : value;
+                    };
+                    result.exceptionDetails = {
+                        text: e.toString(),
+                        lineNumber: getAsInt(e, "lineNumber"),
+                        columnNumber: getAsInt(e, "columnNumber"),
+                        exception
+                    };
+                }
+            } else if (command === "postMessage") {
+                this.messageHandlers.forEach(fn => fn(deserialize(params.msg)));
+            }
+            if (respChannel) {
+                let chan = deserialize(respChannel);
+                await chan.connect();
+                await chan.send(resp);
+            }
+        }
+
+        /**
+         * Add a handler for ``postMessage`` messages
+         *
+         * @param {Function} fn - Callback function that receives the
+         * message.
+         */
+        addMessageHandler(fn) {
+            this.messageHandlers.add(fn);
+        }
+
+        /**
+         * Remove a handler for ``postMessage`` messages
+         *
+         * @param {Function} fn - Callback function to remove
+         */
+        removeMessageHandler(fn) {
+            this.messageHandlers.delete(fn);
+        }
+
+        /**
+         * Wait for the next ``postMessage`` message and return it
+         * (after passing it to existing handlers)
+         *
+         * @returns {Promise} - Promise that resolves to the message.
+         */
+        nextMessage() {
+            return new Promise(resolve => {
+                let fn = (msg) => {
+                    this.removeMessageHandler(fn);
+                    resolve(msg);
+                };
+                this.addMessageHandler(fn);
+            });
+        }
+    }
+
+    class RemoteGlobalResponseRecvChannel {
+        constructor(recvChannel) {
+            this.channel = recvChannel;
+            this.channel.addEventListener("message", ({data}) => this.handleMessage(data));
+            this.responseHandlers = new Map();
+        }
+
+        setResponseHandler(commandId, fn) {
+            this.responseHandlers.set(commandId, fn);
+        }
+
+        handleMessage(msg) {
+            let {id, result} = msg;
+            let handler = this.responseHandlers.get(id);
+            if (handler) {
+                this.responseHandlers.delete(id);
+                handler(result);
+            }
+        }
+
+        close() {
+            return this.channel.close();
+        }
+    }
+
+    /**
+     * Object representing a remote global that has a
+     * `RemoteGlobalCommandRecvChannel
+     * <#RemoteGlobalCommandRecvChannel>`_
+     */
+    class RemoteGlobal {
+        /**
+         * Create a new RemoteGlobal object.
+         *
+         * This doesn't actually construct the global itself; that
+         * must be done elsewhere, with a ``uuid`` query parameter in
+         * its URL set to the same as the ``uuid`` property of this
+         * object.
+         *
+         * @param {SendChannel|string} [dest] - Either a SendChannel
+         * to the destination, or the UUID of the destination. If
+         * ommitted, a new UUID is generated, which can be used when
+         * constructing the URL for the global.
+         *
+         */
+        constructor(dest) {
+            if (dest === undefined || dest === null) {
+                dest = createUuid();
+            }
+            if (typeof dest == "string") {
+                /** UUID for the global */
+                this.uuid = dest;
+                this.sendChannel = new SendChannel(dest);
+            } else if (dest instanceof SendChannel) {
+                this.sendChannel = dest;
+                this.uuid = dest.uuid;
+            } else {
+                throw new TypeError("Unrecognised type, expected string or SendChannel");
+            }
+            this.recvChannel = null;
+            this.respChannel = null;
+            this.connected = false;
+            this.commandId = 0;
+        }
+
+        /**
+         * Connect to the channel. Automatically called when sending the
+         * first message
+         */
+        async connect() {
+            if (this.connected) {
+                return;
+            }
+            let [recvChannel, respChannel] = self.channel();
+            await Promise.all([this.sendChannel.connect(), recvChannel.connect()]);
+            this.recvChannel = new RemoteGlobalResponseRecvChannel(recvChannel);
+            this.respChannel = respChannel;
+            this.connected = true;
+        }
+
+        async sendMessage(command, params, hasResp=true) {
+            if (!this.connected) {
+                await this.connect();
+            }
+            let msg = {id: this.commandId++, command, params};
+            if (hasResp) {
+                msg.respChannel = serialize(this.respChannel);
+            }
+            let response;
+            if (hasResp) {
+                response = new Promise(resolve =>
+                    this.recvChannel.setResponseHandler(msg.id, resolve));
+            } else {
+                response = null;
+            }
+            this.sendChannel.send(msg);
+            return await response;
+        }
+
+        /**
+         * Run the function ``fn`` in the remote global, passing arguments
+         * ``args``, and return the result after awaiting any returned
+         * promise.
+         *
+         * @param {Function} fn - Function to run in the remote global.
+         * @param {...Any} args  - Arguments to pass to the function
+         * @returns {Promise} - Promise resolving to the return value
+         * of the function.
+         */
+        async call(fn, ...args) {
+            let result = await this.sendMessage("call", {fn: serialize(fn), args: args.map(x => serialize(x))}, true);
+            if (result.exceptionDetails) {
+                throw deserialize(result.exceptionDetails.exception);
+            }
+            return deserialize(result.result);
+        }
+
+        /**
+         * Post a message to the remote
+         *
+         * @param {Any} msg - The message to send.
+         */
+        async postMessage(msg) {
+            await this.sendMessage("postMessage", {msg: serialize(msg)}, false);
+        }
+
+        /**
+         * Disconnect the associated `RemoteGlobalCommandRecvChannel
+         * <#RemoteGlobalCommandRecvChannel>`_, if any, on the server
+         * side.
+         *
+         * @returns {Promise} - Resolved once the channel is disconnected.
+         */
+        disconnectReader() {
+            // This causes any readers to disconnect until they are explicitly reconnected
+            return this.sendChannel.disconnectReader();
+        }
+
+        /**
+         * Close the channel and underlying websocket connections
+         */
+        close() {
+            let closers = [this.sendChannel.close()];
+            if (this.recvChannel !== null) {
+                closers.push(this.recvChannel.close());
+            }
+            if (this.respChannel !== null) {
+                closers.push(this.respChannel.close());
+            }
+            return Promise.all(closers);
+        }
+    }
+
+    self.RemoteGlobal = RemoteGlobal;
+
+    function typeName(value) {
+        let type = typeof value;
+        if (type === "undefined" ||
+            type === "string" ||
+            type === "boolean" ||
+            type === "number" ||
+            type === "bigint" ||
+            type === "symbol" ||
+            type === "function") {
+            return type;
+        }
+
+        if (value === null) {
+            return "null";
+        }
+        // The handling of cross-global objects here is broken
+        if (value instanceof RemoteObject) {
+            return "remoteobject";
+        }
+        if (value instanceof SendChannel) {
+            return "sendchannel";
+        }
+        if (value instanceof RecvChannel) {
+            return "recvchannel";
+        }
+        if (value instanceof Error) {
+            return "error";
+        }
+        if (Array.isArray(value)) {
+            return "array";
+        }
+        let constructor = value.constructor && value.constructor.name;
+        if (constructor === "RegExp" ||
+            constructor === "Date" ||
+            constructor === "Map" ||
+            constructor === "Set" ||
+            constructor == "WeakMap" ||
+            constructor == "WeakSet") {
+            return constructor.toLowerCase();
+        }
+        // The handling of cross-global objects here is broken
+        if (typeof window == "object" && window === self) {
+            if (value instanceof Element) {
+                return "element";
+            }
+            if (value instanceof Document) {
+                return "document";
+            }
+            if (value instanceof Node) {
+                return "node";
+            }
+            if (value instanceof Window) {
+                return "window";
+            }
+        }
+        if (Promise.resolve(value) === value) {
+            return "promise";
+        }
+        return "object";
+    }
+
+    let remoteObjectsById = new Map();
+
+    function remoteId(obj) {
+        let rv;
+        rv = createUuid();
+        remoteObjectsById.set(rv, obj);
+        return rv;
+    }
+
+    /**
+     * Representation of a non-primitive type passed through a channel
+     */
+    class RemoteObject {
+        constructor(type, objectId) {
+            this.type = type;
+            this.objectId = objectId;
+        }
+
+        /**
+         * Create a RemoteObject containing a handle to reference obj
+         *
+         * @param {Any} obj - The object to reference.
+         */
+        static from(obj) {
+            let type = typeName(obj);
+            let id = remoteId(obj);
+            return new RemoteObject(type, id);
+        }
+
+        /**
+         * Return the local object referenced by the ``objectId`` of
+         * this ``RemoteObject``, or ``null`` if there isn't a such an
+         * object in this realm.
+         */
+        toLocal() {
+            if (remoteObjectsById.has(this.objectId)) {
+                return remoteObjectsById.get(this.objectId);
+            }
+            return null;
+        }
+
+        /**
+         * Remove the object from the local cache. This means that future
+         * calls to ``toLocal`` with the same objectId will always return
+         * ``null``.
+         */
+        delete() {
+            remoteObjectsById.delete(this.objectId);
+        }
+    }
+
+    self.RemoteObject = RemoteObject;
+
+    /**
+     * Serialize an object as a JSON-compatible representation.
+     *
+     * The format used is similar (but not identical to)
+     * `WebDriver-BiDi
+     * <https://w3c.github.io/webdriver-bidi/#data-types-protocolValue>`_.
+     *
+     * Each item to be serialized can have the following fields:
+     *
+     * type - The name of the type being represented e.g. "string", or
+     *  "map". For primitives this matches ``typeof``, but for
+     *  ``object`` types that have particular support in the protocol
+     *  e.g. arrays and maps, it is a custom value.
+     *
+     * value - A serialized representation of the object value. For
+     * container types this is a JSON container (i.e. an object or an
+     * array) containing a serialized representation of the child
+     * values.
+     *
+     * objectId - An integer used to handle object graphs. Where
+     * an object is present more than once in the serialization, the
+     * first instance has both ``value`` and ``objectId`` fields, but
+     * when encountered again, only ``objectId`` is present, with the
+     * same value as the first instance of the object.
+     *
+     * @param {Any} inValue - The value to be serialized.
+     * @returns {Object} - The serialized object value.
+     */
+    function serialize(inValue) {
+        const queue = [{item: inValue}];
+        let outValue = null;
+
+        // Map from container object input to output value
+        let objectsSeen = new Map();
+        let lastObjectId = 0;
+
+        /* Instead of making this recursive, use a queue holding the objects to be
+         * serialized. Each item in the queue can have the following properties:
+         *
+         * item (required) - the input item to be serialized
+         *
+         * target - For collections, the output serialized object to
+         * which the serialization of the current item will be added.
+         *
+         * targetName - For serializing object members, the name of
+         * the property. For serializing maps either "key" or "value",
+         * depending on whether the item represents a key or a value
+         * in the map.
+         */
+        while (queue.length > 0) {
+            const {item, target, targetName} = queue.shift();
+            let type = typeName(item);
+
+            let serialized = {type};
+
+            if (objectsSeen.has(item)) {
+                let outputValue = objectsSeen.get(item);
+                if (!outputValue.hasOwnProperty("objectId")) {
+                    outputValue.objectId = lastObjectId++;
+                }
+                serialized.objectId = outputValue.objectId;
+            } else {
+                switch (type) {
+                case "undefined":
+                case "null":
+                    break;
+                case "string":
+                case "boolean":
+                    serialized.value = item;
+                    break;
+                case "number":
+                    if (item !== item) {
+                        serialized.value = "NaN";
+                    } else if (item === 0 && 1/item == Number.NEGATIVE_INFINITY) {
+                        serialized.value = "-0";
+                    } else if (item === Number.POSITIVE_INFINITY) {
+                        serialized.value = "+Infinity";
+                    } else if (item === Number.NEGATIVE_INFINITY) {
+                        serialized.value = "-Infinity";
+                    } else {
+                        serialized.value = item;
+                    }
+                    break;
+                case "bigint":
+                case "function":
+                    serialized.value = item.toString();
+                    break;
+                case "remoteobject":
+                    serialized.value = {
+                        type: item.type,
+                        objectId: item.objectId
+                    };
+                    break;
+                case "sendchannel":
+                    serialized.value = item.uuid;
+                    break;
+                case "regexp":
+                    serialized.value = {
+                        pattern: item.source,
+                        flags: item.flags
+                    };
+                    break;
+                case "date":
+                    serialized.value = Date.prototype.toJSON.call(item);
+                    break;
+                case "error":
+                    serialized.value = {
+                        type: item.constructor.name,
+                        name: item.name,
+                        message: item.message,
+                        lineNumber: item.lineNumber,
+                        columnNumber: item.columnNumber,
+                        fileName: item.fileName,
+                        stack: item.stack,
+                    };
+                    break;
+                case "array":
+                case "set":
+                    serialized.value = [];
+                    for (let child of item) {
+                        queue.push({item: child, target: serialized});
+                    }
+                    break;
+                case "object":
+                    serialized.value = {};
+                    for (let [targetName, child] of Object.entries(item)) {
+                        queue.push({item: child, target: serialized, targetName});
+                    }
+                    break;
+                case "map":
+                    serialized.value = [];
+                    for (let [childKey, childValue] of item.entries()) {
+                        queue.push({item: childKey, target: serialized, targetName: "key"});
+                        queue.push({item: childValue, target: serialized, targetName: "value"});
+                    }
+                    break;
+                default:
+                    throw new TypeError(`Can't serialize value of type ${type}; consider using RemoteObject.from() to wrap the object`);
+                };
+            }
+            if (serialized.objectId === undefined) {
+                objectsSeen.set(item, serialized);
+            }
+
+            if (target === undefined) {
+                if (outValue !== null) {
+                    throw new Error("Tried to create multiple output values");
+                }
+                outValue = serialized;
+            } else {
+                switch (target.type) {
+                case "array":
+                case "set":
+                    target.value.push(serialized);
+                    break;
+                case "object":
+                    target.value[targetName] = serialized;
+                    break;
+                case "map":
+                    // We always serialize key and value as adjacent items in the queue,
+                    // so when we get the key push a new output array and then the value will
+                    // be added on the next iteration.
+                    if (targetName === "key") {
+                        target.value.push([]);
+                    }
+                    target.value[target.value.length - 1].push(serialized);
+                    break;
+                default:
+                    throw new Error(`Unknown collection target type ${target.type}`);
+                }
+            }
+        }
+        return outValue;
+    }
+
+    /**
+     * Deserialize an object from a JSON-compatible representation.
+     *
+     * For details on the serialized representation see serialize().
+     *
+     * @param {Object} obj - The value to be deserialized.
+     * @returns {Any} - The deserialized value.
+     */
+    function deserialize(obj) {
+        let deserialized = null;
+        let queue = [{item: obj, target: null}];
+        let objectMap = new Map();
+
+        /* Instead of making this recursive, use a queue holding the objects to be
+         * deserialized. Each item in the queue has the following properties:
+         *
+         * item - The input item to be deserialised.
+         *
+         * target - For members of a collection, a wrapper around the
+         * output collection. This has a ``type`` field which is the
+         * name of the collection type, and a ``value`` field which is
+         * the actual output collection. For primitives, this is null.
+         *
+         * targetName - For object members, the property name on the
+         * output object. For maps, "key" if the item is a key in the output map,
+         * or "value" if it's a value in the output map.
+         */
+        while (queue.length > 0) {
+            const {item, target, targetName} = queue.shift();
+            const {type, value, objectId} = item;
+            let result;
+            let newTarget;
+            if (objectId !== undefined && value === undefined) {
+                result = objectMap.get(objectId);
+            } else {
+                switch(type) {
+                case "undefined":
+                    result = undefined;
+                    break;
+                case "null":
+                    result = null;
+                    break;
+                case "string":
+                case "boolean":
+                    result = value;
+                    break;
+                case "number":
+                    if (typeof value === "string") {
+                        switch(value) {
+                        case "NaN":
+                            result = NaN;
+                            break;
+                        case "-0":
+                            result = -0;
+                            break;
+                        case "+Infinity":
+                            result = Number.POSITIVE_INFINITY;
+                            break;
+                        case "-Infinity":
+                            result = Number.NEGATIVE_INFINITY;
+                            break;
+                        default:
+                            throw new Error(`Unexpected number value "${value}"`);
+                        }
+                    } else {
+                        result = value;
+                    }
+                    break;
+                case "bigint":
+                    result = BigInt(value);
+                    break;
+                case "function":
+                    result = new Function("...args", `return (${value}).apply(null, args)`);
+                    break;
+                case "remoteobject":
+                    let remote = new RemoteObject(value.type, value.objectId);
+                    let local = remote.toLocal();
+                    if (local !== null) {
+                        result = local;
+                    } else {
+                        result = remote;
+                    }
+                    break;
+                case "sendchannel":
+                    result = new SendChannel(value);
+                    break;
+                case "regexp":
+                    result = new RegExp(value.pattern, value.flags);
+                    break;
+                case "date":
+                    result = new Date(value);
+                    break;
+                case "error":
+                    // The item.value.type property is the name of the error constructor.
+                    // If we have a constructor with the same name in the current realm,
+                    // construct an instance of that type, otherwise use a generic Error
+                    // type.
+                    if (item.value.type in self &&
+                        typeof self[item.value.type] === "function") {
+                        result = new self[item.value.type](item.value.message);
+                    } else {
+                        result = new Error(item.value.message);
+                    }
+                    result.name = item.value.name;
+                    result.lineNumber = item.value.lineNumber;
+                    result.columnNumber = item.value.columnNumber;
+                    result.fileName = item.value.fileName;
+                    result.stack = item.value.stack;
+                    break;
+                case "array":
+                    result = [];
+                    newTarget = {type, value: result};
+                    for (let child of value) {
+                        queue.push({item: child, target: newTarget});
+                    }
+                    break;
+                case "set":
+                    result = new Set();
+                    newTarget = {type, value: result};
+                    for (let child of value) {
+                        queue.push({item: child, target: newTarget});
+                    }
+                    break;
+                case "object":
+                    result = {};
+                    newTarget = {type, value: result};
+                    for (let [targetName, child] of Object.entries(value)) {
+                        queue.push({item: child, target: newTarget, targetName});
+                    }
+                    break;
+                case "map":
+                    result = new Map();
+                    newTarget = {type, value: result};
+                    for (let [key, child] of value) {
+                        queue.push({item: key, target: newTarget, targetName: "key"});
+                        queue.push({item: child, target: newTarget, targetName: "value"});
+                    }
+                    break;
+                default:
+                    throw new TypeError(`Can't deserialize object of type ${type}`);
+                }
+                if (objectId !== undefined) {
+                    objectMap.set(objectId, result);
+                }
+            }
+
+            if (target === null) {
+                if (deserialized !== null) {
+                    throw new Error(`Tried to deserialized a non-root output value without a target`
+                                    ` container object.`);
+                }
+                deserialized = result;
+            } else {
+                switch(target.type) {
+                case "array":
+                    target.value.push(result);
+                    break;
+                case "set":
+                    target.value.add(result);
+                    break;
+                case "object":
+                    target.value[targetName] = result;
+                    break;
+                case "map":
+                    // For maps the same target wrapper is shared between key and value.
+                    // After deserializing the key, set the `key` property on the target
+                    // until we come to the value.
+                    if (targetName === "key") {
+                        target.key = result;
+                    } else {
+                        target.value.set(target.key, result);
+                    }
+                    break;
+                default:
+                    throw new Error(`Unknown target type ${target.type}`);
+                }
+            }
+        }
+        return deserialized;
+    }
+})();
diff --git a/test/wpt/tests/resources/check-layout-th.js b/test/wpt/tests/resources/check-layout-th.js
new file mode 100644
index 00000000000..f14ca3246b8
--- /dev/null
+++ b/test/wpt/tests/resources/check-layout-th.js
@@ -0,0 +1,252 @@
+(function() {
+// Test is initiated from body.onload, so explicit done() call is required.
+setup({ explicit_done: true });
+
+function checkSubtreeExpectedValues(t, parent, prefix)
+{
+    var checkedLayout = checkExpectedValues(t, parent, prefix);
+    Array.prototype.forEach.call(parent.childNodes, function(node) {
+        checkedLayout |= checkSubtreeExpectedValues(t, node, prefix);
+    });
+    return checkedLayout;
+}
+
+function checkAttribute(output, node, attribute)
+{
+    var result = node.getAttribute && node.getAttribute(attribute);
+    output.checked |= !!result;
+    return result;
+}
+
+function assert_tolerance(actual, expected, message)
+{
+    if (isNaN(expected) || isNaN(actual) || Math.abs(actual - expected) >= 1) {
+        assert_equals(actual, Number(expected), message);
+    }
+}
+
+function checkDataKeys(node) {
+  // The purpose of this list of data-* attributes is simply to ensure typos
+  // in tests are caught. It is therefore "ok" to add to this list for
+  // specific tests.
+    var validData = new Set([
+        "data-anchor-polyfill",
+        "data-expected-width",
+        "data-expected-height",
+        "data-offset-x",
+        "data-offset-y",
+        "data-expected-client-width",
+        "data-expected-client-height",
+        "data-expected-scroll-width",
+        "data-expected-scroll-height",
+        "data-expected-bounding-client-rect-width",
+        "data-expected-bounding-client-rect-height",
+        "data-total-x",
+        "data-total-y",
+        "data-expected-display",
+        "data-expected-padding-top",
+        "data-expected-padding-bottom",
+        "data-expected-padding-left",
+        "data-expected-padding-right",
+        "data-expected-margin-top",
+        "data-expected-margin-bottom",
+        "data-expected-margin-left",
+        "data-expected-margin-right"
+    ]);
+    if (!node || !node.getAttributeNames)
+        return;
+    // Use "data-test" prefix if you need custom-named data elements.
+    for (let name of node.getAttributeNames()) {
+        if (name.startsWith("data-") && !name.startsWith("data-test"))
+            assert_true(validData.has(name), name + " is a valid data attribute");
+    }
+}
+
+function checkExpectedValues(t, node, prefix)
+{
+    checkDataKeys(node);
+    var output = { checked: false };
+
+    var expectedWidth = checkAttribute(output, node, "data-expected-width");
+    if (expectedWidth) {
+        assert_tolerance(node.offsetWidth, expectedWidth, prefix + "width");
+    }
+
+    var expectedHeight = checkAttribute(output, node, "data-expected-height");
+    if (expectedHeight) {
+        assert_tolerance(node.offsetHeight, expectedHeight, prefix + "height");
+    }
+
+    var expectedOffset = checkAttribute(output, node, "data-offset-x");
+    if (expectedOffset) {
+        assert_tolerance(node.offsetLeft, expectedOffset, prefix + "offsetLeft");
+    }
+
+    var expectedOffset = checkAttribute(output, node, "data-offset-y");
+    if (expectedOffset) {
+        assert_tolerance(node.offsetTop, expectedOffset, prefix + "offsetTop");
+    }
+
+    var expectedWidth = checkAttribute(output, node, "data-expected-client-width");
+    if (expectedWidth) {
+        assert_tolerance(node.clientWidth, expectedWidth, prefix + "clientWidth");
+    }
+
+    var expectedHeight = checkAttribute(output, node, "data-expected-client-height");
+    if (expectedHeight) {
+        assert_tolerance(node.clientHeight, expectedHeight, prefix + "clientHeight");
+    }
+
+    var expectedWidth = checkAttribute(output, node, "data-expected-scroll-width");
+    if (expectedWidth) {
+        assert_tolerance(node.scrollWidth, expectedWidth, prefix + "scrollWidth");
+    }
+
+    var expectedHeight = checkAttribute(output, node, "data-expected-scroll-height");
+    if (expectedHeight) {
+        assert_tolerance(node.scrollHeight, expectedHeight, prefix + "scrollHeight");
+    }
+
+    var expectedWidth = checkAttribute(output, node, "data-expected-bounding-client-rect-width");
+    if (expectedWidth) {
+        assert_tolerance(node.getBoundingClientRect().width, expectedWidth, prefix + "getBoundingClientRect().width");
+    }
+
+    var expectedHeight = checkAttribute(output, node, "data-expected-bounding-client-rect-height");
+    if (expectedHeight) {
+        assert_tolerance(node.getBoundingClientRect().height, expectedHeight, prefix + "getBoundingClientRect().height");
+    }
+
+    var expectedOffset = checkAttribute(output, node, "data-total-x");
+    if (expectedOffset) {
+        var totalLeft = node.clientLeft + node.offsetLeft;
+        assert_tolerance(totalLeft, expectedOffset, prefix +
+                         "clientLeft+offsetLeft (" + node.clientLeft + " + " + node.offsetLeft + ")");
+    }
+
+    var expectedOffset = checkAttribute(output, node, "data-total-y");
+    if (expectedOffset) {
+        var totalTop = node.clientTop + node.offsetTop;
+        assert_tolerance(totalTop, expectedOffset, prefix +
+                         "clientTop+offsetTop (" + node.clientTop + " + " + node.offsetTop + ")");
+    }
+
+    var expectedDisplay = checkAttribute(output, node, "data-expected-display");
+    if (expectedDisplay) {
+        var actualDisplay = getComputedStyle(node).display;
+        assert_equals(actualDisplay, expectedDisplay, prefix + "display");
+    }
+
+    var expectedPaddingTop = checkAttribute(output, node, "data-expected-padding-top");
+    if (expectedPaddingTop) {
+        var actualPaddingTop = getComputedStyle(node).paddingTop;
+        // Trim the unit "px" from the output.
+        actualPaddingTop = actualPaddingTop.slice(0, -2);
+        assert_equals(actualPaddingTop, expectedPaddingTop, prefix + "padding-top");
+    }
+
+    var expectedPaddingBottom = checkAttribute(output, node, "data-expected-padding-bottom");
+    if (expectedPaddingBottom) {
+        var actualPaddingBottom = getComputedStyle(node).paddingBottom;
+        // Trim the unit "px" from the output.
+        actualPaddingBottom = actualPaddingBottom.slice(0, -2);
+        assert_equals(actualPaddingBottom, expectedPaddingBottom, prefix + "padding-bottom");
+    }
+
+    var expectedPaddingLeft = checkAttribute(output, node, "data-expected-padding-left");
+    if (expectedPaddingLeft) {
+        var actualPaddingLeft = getComputedStyle(node).paddingLeft;
+        // Trim the unit "px" from the output.
+        actualPaddingLeft = actualPaddingLeft.slice(0, -2);
+        assert_equals(actualPaddingLeft, expectedPaddingLeft, prefix + "padding-left");
+    }
+
+    var expectedPaddingRight = checkAttribute(output, node, "data-expected-padding-right");
+    if (expectedPaddingRight) {
+        var actualPaddingRight = getComputedStyle(node).paddingRight;
+        // Trim the unit "px" from the output.
+        actualPaddingRight = actualPaddingRight.slice(0, -2);
+        assert_equals(actualPaddingRight, expectedPaddingRight, prefix + "padding-right");
+    }
+
+    var expectedMarginTop = checkAttribute(output, node, "data-expected-margin-top");
+    if (expectedMarginTop) {
+        var actualMarginTop = getComputedStyle(node).marginTop;
+        // Trim the unit "px" from the output.
+        actualMarginTop = actualMarginTop.slice(0, -2);
+        assert_equals(actualMarginTop, expectedMarginTop, prefix + "margin-top");
+    }
+
+    var expectedMarginBottom = checkAttribute(output, node, "data-expected-margin-bottom");
+    if (expectedMarginBottom) {
+        var actualMarginBottom = getComputedStyle(node).marginBottom;
+        // Trim the unit "px" from the output.
+        actualMarginBottom = actualMarginBottom.slice(0, -2);
+        assert_equals(actualMarginBottom, expectedMarginBottom, prefix + "margin-bottom");
+    }
+
+    var expectedMarginLeft = checkAttribute(output, node, "data-expected-margin-left");
+    if (expectedMarginLeft) {
+        var actualMarginLeft = getComputedStyle(node).marginLeft;
+        // Trim the unit "px" from the output.
+        actualMarginLeft = actualMarginLeft.slice(0, -2);
+        assert_equals(actualMarginLeft, expectedMarginLeft, prefix + "margin-left");
+    }
+
+    var expectedMarginRight = checkAttribute(output, node, "data-expected-margin-right");
+    if (expectedMarginRight) {
+        var actualMarginRight = getComputedStyle(node).marginRight;
+        // Trim the unit "px" from the output.
+        actualMarginRight = actualMarginRight.slice(0, -2);
+        assert_equals(actualMarginRight, expectedMarginRight, prefix + "margin-right");
+    }
+
+    return output.checked;
+}
+
+var testNumber = 0;
+var highlightError = false; // displays outline around failed test element.
+var printDomOnError = true; // prints dom when test fails.
+
+window.checkLayout = function(selectorList, callDone = true)
+{
+    if (!selectorList) {
+        console.error("You must provide a CSS selector of nodes to check.");
+        return;
+    }
+    var nodes = document.querySelectorAll(selectorList);
+    nodes = Array.prototype.slice.call(nodes);
+    var checkedLayout = false;
+    Array.prototype.forEach.call(nodes, function(node) {
+        test(function(t) {
+            var container = node.parentNode.className == 'container' ? node.parentNode : node;
+            var prefix =
+                printDomOnError ? '\n' + container.outerHTML + '\n' : '';
+            var passed = false;
+            try {
+                checkedLayout |= checkExpectedValues(t, node.parentNode, prefix);
+                checkedLayout |= checkSubtreeExpectedValues(t, node, prefix);
+                passed = true;
+            } finally {
+              if (!passed && highlightError) {
+                if (!document.getElementById('testharness_error_css')) {
+                  var style = document.createElement('style');
+                  style.id = 'testharness_error_css';
+                  style.textContent = '.testharness_error { outline: red dotted 2px !important; }';
+                  document.body.appendChild(style);
+                }
+                if (node)
+                  node.classList.add('testharness_error');
+              }
+                checkedLayout |= !passed;
+            }
+        }, selectorList + ' ' + String(++testNumber));
+    });
+    if (!checkedLayout) {
+        console.error("No valid data-* attributes found in selector list : " + selectorList);
+    }
+    if (callDone)
+        done();
+};
+
+})();
diff --git a/test/wpt/tests/resources/check-layout.js b/test/wpt/tests/resources/check-layout.js
new file mode 100644
index 00000000000..8634481497d
--- /dev/null
+++ b/test/wpt/tests/resources/check-layout.js
@@ -0,0 +1,245 @@
+(function() {
+
+function insertAfter(nodeToAdd, referenceNode)
+{
+    if (referenceNode == document.body) {
+        document.body.appendChild(nodeToAdd);
+        return;
+    }
+
+    if (referenceNode.nextSibling)
+        referenceNode.parentNode.insertBefore(nodeToAdd, referenceNode.nextSibling);
+    else
+        referenceNode.parentNode.appendChild(nodeToAdd);
+}
+
+function positionedAncestor(node)
+{
+    var ancestor = node.parentNode;
+    while (getComputedStyle(ancestor).position == 'static')
+        ancestor = ancestor.parentNode;
+    return ancestor;
+}
+
+function checkSubtreeExpectedValues(parent, failures)
+{
+    var checkedLayout = checkExpectedValues(parent, failures);
+    Array.prototype.forEach.call(parent.childNodes, function(node) {
+        checkedLayout |= checkSubtreeExpectedValues(node, failures);
+    });
+    return checkedLayout;
+}
+
+function checkAttribute(output, node, attribute)
+{
+    var result = node.getAttribute && node.getAttribute(attribute);
+    output.checked |= !!result;
+    return result;
+}
+
+function checkExpectedValues(node, failures)
+{
+    var output = { checked: false };
+    var expectedWidth = checkAttribute(output, node, "data-expected-width");
+    if (expectedWidth) {
+        if (isNaN(expectedWidth) || Math.abs(node.offsetWidth - expectedWidth) >= 1)
+            failures.push("Expected " + expectedWidth + " for width, but got " + node.offsetWidth + ". ");
+    }
+
+    var expectedHeight = checkAttribute(output, node, "data-expected-height");
+    if (expectedHeight) {
+        if (isNaN(expectedHeight) || Math.abs(node.offsetHeight - expectedHeight) >= 1)
+            failures.push("Expected " + expectedHeight + " for height, but got " + node.offsetHeight + ". ");
+    }
+
+    var expectedOffset = checkAttribute(output, node, "data-offset-x");
+    if (expectedOffset) {
+        if (isNaN(expectedOffset) || Math.abs(node.offsetLeft - expectedOffset) >= 1)
+            failures.push("Expected " + expectedOffset + " for offsetLeft, but got " + node.offsetLeft + ". ");
+    }
+
+    var expectedOffset = checkAttribute(output, node, "data-offset-y");
+    if (expectedOffset) {
+        if (isNaN(expectedOffset) || Math.abs(node.offsetTop - expectedOffset) >= 1)
+            failures.push("Expected " + expectedOffset + " for offsetTop, but got " + node.offsetTop + ". ");
+    }
+
+    var expectedOffset = checkAttribute(output, node, "data-positioned-offset-x");
+    if (expectedOffset) {
+        var actualOffset = node.getBoundingClientRect().left - positionedAncestor(node).getBoundingClientRect().left;
+        if (isNaN(expectedOffset) || Math.abs(actualOffset - expectedOffset) >= 1)
+            failures.push("Expected " + expectedOffset + " for getBoundingClientRect().left offset, but got " + actualOffset + ". ");
+    }
+
+    var expectedOffset = checkAttribute(output, node, "data-positioned-offset-y");
+    if (expectedOffset) {
+        var actualOffset = node.getBoundingClientRect().top - positionedAncestor(node).getBoundingClientRect().top;
+        if (isNaN(expectedOffset) || Math.abs(actualOffset - expectedOffset) >= 1)
+            failures.push("Expected " + expectedOffset + " for getBoundingClientRect().top offset, but got " + actualOffset + ". ");
+    }
+
+    var expectedWidth = checkAttribute(output, node, "data-expected-client-width");
+    if (expectedWidth) {
+        if (isNaN(expectedWidth) || Math.abs(node.clientWidth - expectedWidth) >= 1)
+            failures.push("Expected " + expectedWidth + " for clientWidth, but got " + node.clientWidth + ". ");
+    }
+
+    var expectedHeight = checkAttribute(output, node, "data-expected-client-height");
+    if (expectedHeight) {
+        if (isNaN(expectedHeight) || Math.abs(node.clientHeight - expectedHeight) >= 1)
+            failures.push("Expected " + expectedHeight + " for clientHeight, but got " + node.clientHeight + ". ");
+    }
+
+    var expectedWidth = checkAttribute(output, node, "data-expected-scroll-width");
+    if (expectedWidth) {
+        if (isNaN(expectedWidth) || Math.abs(node.scrollWidth - expectedWidth) >= 1)
+            failures.push("Expected " + expectedWidth + " for scrollWidth, but got " + node.scrollWidth + ". ");
+    }
+
+    var expectedHeight = checkAttribute(output, node, "data-expected-scroll-height");
+    if (expectedHeight) {
+        if (isNaN(expectedHeight) || Math.abs(node.scrollHeight - expectedHeight) >= 1)
+            failures.push("Expected " + expectedHeight + " for scrollHeight, but got " + node.scrollHeight + ". ");
+    }
+
+    var expectedOffset = checkAttribute(output, node, "data-total-x");
+    if (expectedOffset) {
+        var totalLeft = node.clientLeft + node.offsetLeft;
+        if (isNaN(expectedOffset) || Math.abs(totalLeft - expectedOffset) >= 1)
+            failures.push("Expected " + expectedOffset + " for clientLeft+offsetLeft, but got " + totalLeft + ", clientLeft: " + node.clientLeft + ", offsetLeft: " + node.offsetLeft + ". ");
+    }
+
+    var expectedOffset = checkAttribute(output, node, "data-total-y");
+    if (expectedOffset) {
+        var totalTop = node.clientTop + node.offsetTop;
+        if (isNaN(expectedOffset) || Math.abs(totalTop - expectedOffset) >= 1)
+            failures.push("Expected " + expectedOffset + " for clientTop+offsetTop, but got " + totalTop + ", clientTop: " + node.clientTop + ", + offsetTop: " + node.offsetTop + ". ");
+    }
+
+    var expectedDisplay = checkAttribute(output, node, "data-expected-display");
+    if (expectedDisplay) {
+        var actualDisplay = getComputedStyle(node).display;
+        if (actualDisplay != expectedDisplay)
+            failures.push("Expected " + expectedDisplay + " for display, but got " + actualDisplay + ". ");
+    }
+
+    var expectedPaddingTop = checkAttribute(output, node, "data-expected-padding-top");
+    if (expectedPaddingTop) {
+        var actualPaddingTop = getComputedStyle(node).paddingTop;
+        // Trim the unit "px" from the output.
+        actualPaddingTop = actualPaddingTop.substring(0, actualPaddingTop.length - 2);
+        if (actualPaddingTop != expectedPaddingTop)
+            failures.push("Expected " + expectedPaddingTop + " for padding-top, but got " + actualPaddingTop + ". ");
+    }
+
+    var expectedPaddingBottom = checkAttribute(output, node, "data-expected-padding-bottom");
+    if (expectedPaddingBottom) {
+        var actualPaddingBottom = getComputedStyle(node).paddingBottom;
+        // Trim the unit "px" from the output.
+        actualPaddingBottom = actualPaddingBottom.substring(0, actualPaddingBottom.length - 2);
+        if (actualPaddingBottom != expectedPaddingBottom)
+            failures.push("Expected " + expectedPaddingBottom + " for padding-bottom, but got " + actualPaddingBottom + ". ");
+    }
+
+    var expectedPaddingLeft = checkAttribute(output, node, "data-expected-padding-left");
+    if (expectedPaddingLeft) {
+        var actualPaddingLeft = getComputedStyle(node).paddingLeft;
+        // Trim the unit "px" from the output.
+        actualPaddingLeft = actualPaddingLeft.substring(0, actualPaddingLeft.length - 2);
+        if (actualPaddingLeft != expectedPaddingLeft)
+            failures.push("Expected " + expectedPaddingLeft + " for padding-left, but got " + actualPaddingLeft + ". ");
+    }
+
+    var expectedPaddingRight = checkAttribute(output, node, "data-expected-padding-right");
+    if (expectedPaddingRight) {
+        var actualPaddingRight = getComputedStyle(node).paddingRight;
+        // Trim the unit "px" from the output.
+        actualPaddingRight = actualPaddingRight.substring(0, actualPaddingRight.length - 2);
+        if (actualPaddingRight != expectedPaddingRight)
+            failures.push("Expected " + expectedPaddingRight + " for padding-right, but got " + actualPaddingRight + ". ");
+    }
+
+    var expectedMarginTop = checkAttribute(output, node, "data-expected-margin-top");
+    if (expectedMarginTop) {
+        var actualMarginTop = getComputedStyle(node).marginTop;
+        // Trim the unit "px" from the output.
+        actualMarginTop = actualMarginTop.substring(0, actualMarginTop.length - 2);
+        if (actualMarginTop != expectedMarginTop)
+            failures.push("Expected " + expectedMarginTop + " for margin-top, but got " + actualMarginTop + ". ");
+    }
+
+    var expectedMarginBottom = checkAttribute(output, node, "data-expected-margin-bottom");
+    if (expectedMarginBottom) {
+        var actualMarginBottom = getComputedStyle(node).marginBottom;
+        // Trim the unit "px" from the output.
+        actualMarginBottom = actualMarginBottom.substring(0, actualMarginBottom.length - 2);
+        if (actualMarginBottom != expectedMarginBottom)
+            failures.push("Expected " + expectedMarginBottom + " for margin-bottom, but got " + actualMarginBottom + ". ");
+    }
+
+    var expectedMarginLeft = checkAttribute(output, node, "data-expected-margin-left");
+    if (expectedMarginLeft) {
+        var actualMarginLeft = getComputedStyle(node).marginLeft;
+        // Trim the unit "px" from the output.
+        actualMarginLeft = actualMarginLeft.substring(0, actualMarginLeft.length - 2);
+        if (actualMarginLeft != expectedMarginLeft)
+            failures.push("Expected " + expectedMarginLeft + " for margin-left, but got " + actualMarginLeft + ". ");
+    }
+
+    var expectedMarginRight = checkAttribute(output, node, "data-expected-margin-right");
+    if (expectedMarginRight) {
+        var actualMarginRight = getComputedStyle(node).marginRight;
+        // Trim the unit "px" from the output.
+        actualMarginRight = actualMarginRight.substring(0, actualMarginRight.length - 2);
+        if (actualMarginRight != expectedMarginRight)
+            failures.push("Expected " + expectedMarginRight + " for margin-right, but got " + actualMarginRight + ". ");
+    }
+
+    return output.checked;
+}
+
+window.checkLayout = function(selectorList, outputContainer)
+{
+    var result = true;
+    if (!selectorList) {
+        document.body.appendChild(document.createTextNode("You must provide a CSS selector of nodes to check."));
+        return;
+    }
+    var nodes = document.querySelectorAll(selectorList);
+    nodes = Array.prototype.slice.call(nodes);
+    nodes.reverse();
+    var checkedLayout = false;
+    Array.prototype.forEach.call(nodes, function(node) {
+        var failures = [];
+        checkedLayout |= checkExpectedValues(node.parentNode, failures);
+        checkedLayout |= checkSubtreeExpectedValues(node, failures);
+
+        var container = node.parentNode.className == 'container' ? node.parentNode : node;
+
+        var pre = document.createElement('pre');
+        if (failures.length) {
+            pre.className = 'FAIL';
+            result = false;
+        }
+        pre.appendChild(document.createTextNode(failures.length ? "FAIL:\n" + failures.join('\n') + '\n\n' + container.outerHTML : "PASS"));
+
+        var referenceNode = container;
+        if (outputContainer) {
+            if (!outputContainer.lastChild) {
+                // Inserting a text node so we have something to insertAfter.
+                outputContainer.textContent = " ";
+            }
+            referenceNode = outputContainer.lastChild;
+        }
+        insertAfter(pre, referenceNode);
+    });
+
+    if (!checkedLayout) {
+        document.body.appendChild(document.createTextNode("FAIL: No valid data-* attributes found in selector list : " + selectorList));
+        return false;
+    }
+
+    return result;
+}
+
+})();
diff --git a/test/wpt/tests/resources/chromium/README.md b/test/wpt/tests/resources/chromium/README.md
new file mode 100644
index 00000000000..be090b332fc
--- /dev/null
+++ b/test/wpt/tests/resources/chromium/README.md
@@ -0,0 +1,7 @@
+This directory contains Chromium-specific test resources, including mocks for
+test-only APIs implemented with
+[MojoJS](https://chromium.googlesource.com/chromium/src/+/main/mojo/public/js/README.md).
+
+Please do **not** copy `*.mojom.m.js` into this directory. Follow this doc if you
+want to add new MojoJS-backed mocks:
+https://chromium.googlesource.com/chromium/src/+/main/docs/testing/web_platform_tests.md#mojojs
diff --git a/test/wpt/tests/resources/chromium/contacts_manager_mock.js b/test/wpt/tests/resources/chromium/contacts_manager_mock.js
new file mode 100644
index 00000000000..049685242bc
--- /dev/null
+++ b/test/wpt/tests/resources/chromium/contacts_manager_mock.js
@@ -0,0 +1,90 @@
+// Copyright 2018 The Chromium Authors
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import {ContactsManager, ContactsManagerReceiver} from '/gen/third_party/blink/public/mojom/contacts/contacts_manager.mojom.m.js';
+
+self.WebContactsTest = (() => {
+  class MockContacts {
+    constructor() {
+      this.receiver_ = new ContactsManagerReceiver(this);
+
+      this.interceptor_ =
+          new MojoInterfaceInterceptor(ContactsManager.$interfaceName);
+      this.interceptor_.oninterfacerequest =
+          e => this.receiver_.$.bindHandle(e.handle);
+      this.interceptor_.start();
+
+      this.selectedContacts_ = [];
+    }
+
+    formatAddress_(address) {
+      // These are all required fields in the mojo definition.
+      return {
+        country: address.country || '',
+        addressLine: address.addressLine || [],
+        region: address.region || '',
+        city: address.city || '',
+        dependentLocality: address.dependentLocality || '',
+        postalCode: address.postCode || '',
+        sortingCode: address.sortingCode || '',
+        organization: address.organization || '',
+        recipient: address.recipient || '',
+        phone: address.phone || '',
+      };
+    }
+
+    async select(multiple, includeNames, includeEmails, includeTel, includeAddresses, includeIcons) {
+      if (this.selectedContacts_ === null)
+        return {contacts: null};
+
+      const contactInfos = await Promise.all(this.selectedContacts_.map(async contact => {
+        const contactInfo = {};
+        if (includeNames)
+          contactInfo.name = contact.name || [];
+        if (includeEmails)
+          contactInfo.email = contact.email || [];
+        if (includeTel)
+          contactInfo.tel = contact.tel || [];
+        if (includeAddresses) {
+          contactInfo.address = (contact.address || []).map(address => this.formatAddress_(address));
+        }
+        if (includeIcons) {
+          contactInfo.icon = await Promise.all(
+            (contact.icon || []).map(async blob => ({
+              mimeType: blob.type,
+              data: (await blob.text()).split('').map(s => s.charCodeAt(0)),
+            })));
+        }
+        return contactInfo;
+      }));
+
+      if (!contactInfos.length) return {contacts: []};
+      if (!multiple) return {contacts: [contactInfos[0]]};
+      return {contacts: contactInfos};
+    }
+
+    setSelectedContacts(contacts) {
+      this.selectedContacts_ = contacts;
+    }
+
+    reset() {
+      this.receiver_.$.close();
+      this.interceptor_.stop();
+    }
+  }
+
+  const mockContacts = new MockContacts();
+
+  class ContactsTestChromium {
+    constructor() {
+      Object.freeze(this); // Make it immutable.
+    }
+
+    setSelectedContacts(contacts) {
+      mockContacts.setSelectedContacts(contacts);
+    }
+  }
+
+  return ContactsTestChromium;
+})();
diff --git a/test/wpt/tests/resources/chromium/content-index-helpers.js b/test/wpt/tests/resources/chromium/content-index-helpers.js
new file mode 100644
index 00000000000..936fe84c9b1
--- /dev/null
+++ b/test/wpt/tests/resources/chromium/content-index-helpers.js
@@ -0,0 +1,9 @@
+import {ContentIndexService} from '/gen/third_party/blink/public/mojom/content_index/content_index.mojom.m.js';
+
+// Returns a promise if the chromium based browser fetches icons for
+// content-index.
+export async function fetchesIcons() {
+  const remote = ContentIndexService.getRemote();
+  const {iconSizes} = await remote.getIconSizes();
+  return iconSizes.length > 0;
+};
diff --git a/test/wpt/tests/resources/chromium/enable-hyperlink-auditing.js b/test/wpt/tests/resources/chromium/enable-hyperlink-auditing.js
new file mode 100644
index 00000000000..263f6512f09
--- /dev/null
+++ b/test/wpt/tests/resources/chromium/enable-hyperlink-auditing.js
@@ -0,0 +1,2 @@
+if (window.testRunner)
+  testRunner.overridePreference("WebKitHyperlinkAuditingEnabled", 1);
diff --git a/test/wpt/tests/resources/chromium/fake-hid.js b/test/wpt/tests/resources/chromium/fake-hid.js
new file mode 100644
index 00000000000..70a01490d87
--- /dev/null
+++ b/test/wpt/tests/resources/chromium/fake-hid.js
@@ -0,0 +1,297 @@
+import {HidConnectionReceiver, HidDeviceInfo} from '/gen/services/device/public/mojom/hid.mojom.m.js';
+import {HidService, HidServiceReceiver} from '/gen/third_party/blink/public/mojom/hid/hid.mojom.m.js';
+
+// Fake implementation of device.mojom.HidConnection. HidConnection represents
+// an open connection to a HID device and can be used to send and receive
+// reports.
+class FakeHidConnection {
+  constructor(client) {
+    this.client_ = client;
+    this.receiver_ = new HidConnectionReceiver(this);
+    this.expectedWrites_ = [];
+    this.expectedGetFeatureReports_ = [];
+    this.expectedSendFeatureReports_ = [];
+  }
+
+  bindNewPipeAndPassRemote() {
+    return this.receiver_.$.bindNewPipeAndPassRemote();
+  }
+
+  // Simulate an input report sent from the device to the host. The connection
+  // client's onInputReport method will be called with the provided |reportId|
+  // and |buffer|.
+  simulateInputReport(reportId, reportData) {
+    if (this.client_) {
+      this.client_.onInputReport(reportId, reportData);
+    }
+  }
+
+  // Specify the result for an expected call to write. If |success| is true the
+  // write will be successful, otherwise it will simulate a failure. The
+  // parameters of the next write call must match |reportId| and |buffer|.
+  queueExpectedWrite(success, reportId, reportData) {
+    this.expectedWrites_.push({
+      params: {reportId, data: reportData},
+      result: {success},
+    });
+  }
+
+  // Specify the result for an expected call to getFeatureReport. If |success|
+  // is true the operation is successful, otherwise it will simulate a failure.
+  // The parameter of the next getFeatureReport call must match |reportId|.
+  queueExpectedGetFeatureReport(success, reportId, reportData) {
+    this.expectedGetFeatureReports_.push({
+      params: {reportId},
+      result: {success, buffer: reportData},
+    });
+  }
+
+  // Specify the result for an expected call to sendFeatureReport. If |success|
+  // is true the operation is successful, otherwise it will simulate a failure.
+  // The parameters of the next sendFeatureReport call must match |reportId| and
+  // |buffer|.
+  queueExpectedSendFeatureReport(success, reportId, reportData) {
+    this.expectedSendFeatureReports_.push({
+      params: {reportId, data: reportData},
+      result: {success},
+    });
+  }
+
+  // Asserts that there are no more expected operations.
+  assertExpectationsMet() {
+    assert_equals(this.expectedWrites_.length, 0);
+    assert_equals(this.expectedGetFeatureReports_.length, 0);
+    assert_equals(this.expectedSendFeatureReports_.length, 0);
+  }
+
+  read() {}
+
+  // Implementation of HidConnection::Write. Causes an assertion failure if
+  // there are no expected write operations, or if the parameters do not match
+  // the expected call.
+  async write(reportId, buffer) {
+    let expectedWrite = this.expectedWrites_.shift();
+    assert_not_equals(expectedWrite, undefined);
+    assert_equals(reportId, expectedWrite.params.reportId);
+    let actual = new Uint8Array(buffer);
+    compareDataViews(
+        new DataView(actual.buffer, actual.byteOffset),
+        new DataView(
+            expectedWrite.params.data.buffer,
+            expectedWrite.params.data.byteOffset));
+    return expectedWrite.result;
+  }
+
+  // Implementation of HidConnection::GetFeatureReport. Causes an assertion
+  // failure if there are no expected write operations, or if the parameters do
+  // not match the expected call.
+  async getFeatureReport(reportId) {
+    let expectedGetFeatureReport = this.expectedGetFeatureReports_.shift();
+    assert_not_equals(expectedGetFeatureReport, undefined);
+    assert_equals(reportId, expectedGetFeatureReport.params.reportId);
+    return expectedGetFeatureReport.result;
+  }
+
+  // Implementation of HidConnection::SendFeatureReport. Causes an assertion
+  // failure if there are no expected write operations, or if the parameters do
+  // not match the expected call.
+  async sendFeatureReport(reportId, buffer) {
+    let expectedSendFeatureReport = this.expectedSendFeatureReports_.shift();
+    assert_not_equals(expectedSendFeatureReport, undefined);
+    assert_equals(reportId, expectedSendFeatureReport.params.reportId);
+    let actual = new Uint8Array(buffer);
+    compareDataViews(
+        new DataView(actual.buffer, actual.byteOffset),
+        new DataView(
+            expectedSendFeatureReport.params.data.buffer,
+            expectedSendFeatureReport.params.data.byteOffset));
+    return expectedSendFeatureReport.result;
+  }
+}
+
+
+// A fake implementation of the HidService mojo interface. HidService manages
+// HID device access for clients in the render process. Typically, when a client
+// requests access to a HID device a chooser dialog is shown with a list of
+// available HID devices. Selecting a device from the chooser also grants
+// permission for the client to access that device.
+//
+// The fake implementation allows tests to simulate connected devices. It also
+// skips the chooser dialog and instead allows tests to specify which device
+// should be selected. All devices are treated as if the user had already
+// granted permission. It is possible to revoke permission with forget() later.
+class FakeHidService {
+  constructor() {
+    this.interceptor_ = new MojoInterfaceInterceptor(HidService.$interfaceName);
+    this.interceptor_.oninterfacerequest = e => this.bind(e.handle);
+    this.receiver_ = new HidServiceReceiver(this);
+    this.nextGuidValue_ = 0;
+    this.simulateConnectFailure_ = false;
+    this.reset();
+  }
+
+  start() {
+    this.interceptor_.start();
+  }
+
+  stop() {
+    this.interceptor_.stop();
+  }
+
+  reset() {
+    this.devices_ = new Map();
+    this.allowedDevices_ = new Map();
+    this.fakeConnections_ = new Map();
+    this.selectedDevices_ = [];
+  }
+
+  // Creates and returns a HidDeviceInfo with the specified device IDs.
+  makeDevice(vendorId, productId) {
+    let guidValue = ++this.nextGuidValue_;
+    let info = new HidDeviceInfo();
+    info.guid = 'guid-' + guidValue.toString();
+    info.physicalDeviceId = 'physical-device-id-' + guidValue.toString();
+    info.vendorId = vendorId;
+    info.productId = productId;
+    info.productName = 'product name';
+    info.serialNumber = '0';
+    info.reportDescriptor = new Uint8Array();
+    info.collections = [];
+    info.deviceNode = 'device node';
+    return info;
+  }
+
+  // Simulates a connected device the client has already been granted permission
+  // to. Returns the key used to store the device in the map. The key is either
+  // the physical device ID, or the device GUID if it has no physical device ID.
+  addDevice(deviceInfo, grantPermission = true) {
+    let key = deviceInfo.physicalDeviceId;
+    if (key.length === 0)
+      key = deviceInfo.guid;
+
+    let devices = this.devices_.get(key) || [];
+    devices.push(deviceInfo);
+    this.devices_.set(key, devices);
+
+    if (grantPermission) {
+      let allowedDevices = this.allowedDevices_.get(key) || [];
+      allowedDevices.push(deviceInfo);
+      this.allowedDevices_.set(key, allowedDevices);
+    }
+
+    if (this.client_)
+      this.client_.deviceAdded(deviceInfo);
+    return key;
+  }
+
+  // Simulates disconnecting a connected device.
+  removeDevice(key) {
+    let devices = this.devices_.get(key);
+    this.devices_.delete(key);
+    if (this.client_ && devices) {
+      devices.forEach(deviceInfo => {
+        this.client_.deviceRemoved(deviceInfo);
+      });
+    }
+  }
+
+  // Simulates updating the device information for a connected device.
+  changeDevice(deviceInfo) {
+    let key = deviceInfo.physicalDeviceId;
+    if (key.length === 0)
+      key = deviceInfo.guid;
+
+    let devices = this.devices_.get(key) || [];
+    let i = devices.length;
+    while (i--) {
+      if (devices[i].guid == deviceInfo.guid)
+        devices.splice(i, 1);
+    }
+    devices.push(deviceInfo);
+    this.devices_.set(key, devices);
+
+    let allowedDevices = this.allowedDevices_.get(key) || [];
+    let j = allowedDevices.length;
+    while (j--) {
+      if (allowedDevices[j].guid == deviceInfo.guid)
+        allowedDevices.splice(j, 1);
+    }
+    allowedDevices.push(deviceInfo);
+    this.allowedDevices_.set(key, allowedDevices);
+
+    if (this.client_)
+      this.client_.deviceChanged(deviceInfo);
+    return key;
+  }
+
+  // Sets a flag that causes the next call to connect() to fail.
+  simulateConnectFailure() {
+    this.simulateConnectFailure_ = true;
+  }
+
+  // Sets the key of the device that will be returned as the selected item the
+  // next time requestDevice is called. The device with this key must have been
+  // previously added with addDevice.
+  setSelectedDevice(key) {
+    this.selectedDevices_ = this.devices_.get(key);
+  }
+
+  // Returns the fake HidConnection object for this device, if there is one. A
+  // connection is created once the device is opened.
+  getFakeConnection(guid) {
+    return this.fakeConnections_.get(guid);
+  }
+
+  bind(handle) {
+    this.receiver_.$.bindHandle(handle);
+  }
+
+  registerClient(client) {
+    this.client_ = client;
+  }
+
+  // Returns an array of connected devices the client has already been granted
+  // permission to access.
+  async getDevices() {
+    let devices = [];
+    this.allowedDevices_.forEach((value) => {
+      devices = devices.concat(value);
+    });
+    return {devices};
+  }
+
+  // Simulates a device chooser prompt, returning |selectedDevices_| as the
+  // simulated selection. |options| is ignored.
+  async requestDevice(options) {
+    return {devices: this.selectedDevices_};
+  }
+
+  // Returns a fake connection to the device with the specified GUID. If
+  // |connectionClient| is not null, its onInputReport method will be called
+  // when input reports are received. If simulateConnectFailure() was called
+  // then a null connection is returned instead, indicating failure.
+  async connect(guid, connectionClient) {
+    if (this.simulateConnectFailure_) {
+      this.simulateConnectFailure_ = false;
+      return {connection: null};
+    }
+    const fakeConnection = new FakeHidConnection(connectionClient);
+    this.fakeConnections_.set(guid, fakeConnection);
+    return {connection: fakeConnection.bindNewPipeAndPassRemote()};
+  }
+
+  // Removes the allowed device.
+  async forget(deviceInfo) {
+    for (const [key, value] of this.allowedDevices_) {
+      for (const device of value) {
+        if (device.guid == deviceInfo.guid) {
+          this.allowedDevices_.delete(key);
+          break;
+        }
+      }
+    }
+    return {success: true};
+  }
+}
+
+export const fakeHidService = new FakeHidService();
diff --git a/test/wpt/tests/resources/chromium/fake-serial.js b/test/wpt/tests/resources/chromium/fake-serial.js
new file mode 100644
index 00000000000..e1e4d57e3ee
--- /dev/null
+++ b/test/wpt/tests/resources/chromium/fake-serial.js
@@ -0,0 +1,443 @@
+import {SerialPortFlushMode, SerialPortRemote, SerialReceiveError, SerialPortReceiver, SerialSendError} from '/gen/services/device/public/mojom/serial.mojom.m.js';
+import {SerialService, SerialServiceReceiver} from '/gen/third_party/blink/public/mojom/serial/serial.mojom.m.js';
+
+// Implementation of an UnderlyingSource to create a ReadableStream from a Mojo
+// data pipe consumer handle.
+class DataPipeSource {
+  constructor(consumer) {
+    this.consumer_ = consumer;
+  }
+
+  async pull(controller) {
+    let chunk = new ArrayBuffer(64);
+    let {result, numBytes} = this.consumer_.readData(chunk);
+    if (result == Mojo.RESULT_OK) {
+      controller.enqueue(new Uint8Array(chunk, 0, numBytes));
+      return;
+    } else if (result == Mojo.RESULT_FAILED_PRECONDITION) {
+      controller.close();
+      return;
+    } else if (result == Mojo.RESULT_SHOULD_WAIT) {
+      await this.readable();
+      return this.pull(controller);
+    }
+  }
+
+  cancel() {
+    if (this.watcher_)
+      this.watcher_.cancel();
+    this.consumer_.close();
+  }
+
+  readable() {
+    return new Promise((resolve) => {
+      this.watcher_ =
+          this.consumer_.watch({ readable: true, peerClosed: true }, () => {
+            this.watcher_.cancel();
+            this.watcher_ = undefined;
+            resolve();
+          });
+    });
+  }
+}
+
+// Implementation of an UnderlyingSink to create a WritableStream from a Mojo
+// data pipe producer handle.
+class DataPipeSink {
+  constructor(producer) {
+    this._producer = producer;
+  }
+
+  async write(chunk, controller) {
+    while (true) {
+      let {result, numBytes} = this._producer.writeData(chunk);
+      if (result == Mojo.RESULT_OK) {
+        if (numBytes == chunk.byteLength) {
+          return;
+        }
+        chunk = chunk.slice(numBytes);
+      } else if (result == Mojo.RESULT_FAILED_PRECONDITION) {
+        throw new DOMException('The pipe is closed.', 'InvalidStateError');
+      } else if (result == Mojo.RESULT_SHOULD_WAIT) {
+        await this.writable();
+      }
+    }
+  }
+
+  close() {
+    assert_equals(undefined, this._watcher);
+    this._producer.close();
+  }
+
+  abort(reason) {
+    if (this._watcher)
+      this._watcher.cancel();
+    this._producer.close();
+  }
+
+  writable() {
+    return new Promise((resolve) => {
+      this._watcher =
+          this._producer.watch({ writable: true, peerClosed: true }, () => {
+            this._watcher.cancel();
+            this._watcher = undefined;
+            resolve();
+          });
+    });
+  }
+}
+
+// Implementation of device.mojom.SerialPort.
+class FakeSerialPort {
+  constructor() {
+    this.inputSignals_ = {
+      dataCarrierDetect: false,
+      clearToSend: false,
+      ringIndicator: false,
+      dataSetReady: false
+    };
+    this.inputSignalFailure_ = false;
+    this.outputSignals_ = {
+      dataTerminalReady: false,
+      requestToSend: false,
+      break: false
+    };
+    this.outputSignalFailure_ = false;
+  }
+
+  open(options, client) {
+    if (this.receiver_ !== undefined) {
+      // Port already open.
+      return null;
+    }
+
+    let port = new SerialPortRemote();
+    this.receiver_ = new SerialPortReceiver(this);
+    this.receiver_.$.bindHandle(port.$.bindNewPipeAndPassReceiver().handle);
+
+    this.options_ = options;
+    this.client_ = client;
+    // OS typically sets DTR on open.
+    this.outputSignals_.dataTerminalReady = true;
+
+    return port;
+  }
+
+  write(data) {
+    return this.writer_.write(data);
+  }
+
+  read() {
+    return this.reader_.read();
+  }
+
+  // Reads from the port until at least |targetLength| is read or the stream is
+  // closed. The data is returned as a combined Uint8Array.
+  readWithLength(targetLength) {
+    return readWithLength(this.reader_, targetLength);
+  }
+
+  simulateReadError(error) {
+    this.writer_.close();
+    this.writer_.releaseLock();
+    this.writer_ = undefined;
+    this.writable_ = undefined;
+    this.client_.onReadError(error);
+  }
+
+  simulateParityError() {
+    this.simulateReadError(SerialReceiveError.PARITY_ERROR);
+  }
+
+  simulateDisconnectOnRead() {
+    this.simulateReadError(SerialReceiveError.DISCONNECTED);
+  }
+
+  simulateWriteError(error) {
+    this.reader_.cancel();
+    this.reader_ = undefined;
+    this.readable_ = undefined;
+    this.client_.onSendError(error);
+  }
+
+  simulateSystemErrorOnWrite() {
+    this.simulateWriteError(SerialSendError.SYSTEM_ERROR);
+  }
+
+  simulateDisconnectOnWrite() {
+    this.simulateWriteError(SerialSendError.DISCONNECTED);
+  }
+
+  simulateInputSignals(signals) {
+    this.inputSignals_ = signals;
+  }
+
+  simulateInputSignalFailure(fail) {
+    this.inputSignalFailure_ = fail;
+  }
+
+  get outputSignals() {
+    return this.outputSignals_;
+  }
+
+  simulateOutputSignalFailure(fail) {
+    this.outputSignalFailure_ = fail;
+  }
+
+  writable() {
+    if (this.writable_)
+      return Promise.resolve();
+
+    if (!this.writablePromise_) {
+      this.writablePromise_ = new Promise((resolve) => {
+        this.writableResolver_ = resolve;
+      });
+    }
+
+    return this.writablePromise_;
+  }
+
+  readable() {
+    if (this.readable_)
+      return Promise.resolve();
+
+    if (!this.readablePromise_) {
+      this.readablePromise_ = new Promise((resolve) => {
+        this.readableResolver_ = resolve;
+      });
+    }
+
+    return this.readablePromise_;
+  }
+
+  async startWriting(in_stream) {
+    this.readable_ = new ReadableStream(new DataPipeSource(in_stream));
+    this.reader_ = this.readable_.getReader();
+    if (this.readableResolver_) {
+      this.readableResolver_();
+      this.readableResolver_ = undefined;
+      this.readablePromise_ = undefined;
+    }
+  }
+
+  async startReading(out_stream) {
+    this.writable_ = new WritableStream(new DataPipeSink(out_stream));
+    this.writer_ = this.writable_.getWriter();
+    if (this.writableResolver_) {
+      this.writableResolver_();
+      this.writableResolver_ = undefined;
+      this.writablePromise_ = undefined;
+    }
+  }
+
+  async flush(mode) {
+    switch (mode) {
+      case SerialPortFlushMode.kReceive:
+        this.writer_.abort();
+        this.writer_.releaseLock();
+        this.writer_ = undefined;
+        this.writable_ = undefined;
+        break;
+      case SerialPortFlushMode.kTransmit:
+        this.reader_.cancel();
+        this.reader_ = undefined;
+        this.readable_ = undefined;
+        break;
+    }
+  }
+
+  async drain() {
+    await this.reader_.closed;
+  }
+
+  async getControlSignals() {
+    if (this.inputSignalFailure_) {
+      return {signals: null};
+    }
+
+    const signals = {
+      dcd: this.inputSignals_.dataCarrierDetect,
+      cts: this.inputSignals_.clearToSend,
+      ri: this.inputSignals_.ringIndicator,
+      dsr: this.inputSignals_.dataSetReady
+    };
+    return {signals};
+  }
+
+  async setControlSignals(signals) {
+    if (this.outputSignalFailure_) {
+      return {success: false};
+    }
+
+    if (signals.hasDtr) {
+      this.outputSignals_.dataTerminalReady = signals.dtr;
+    }
+    if (signals.hasRts) {
+      this.outputSignals_.requestToSend = signals.rts;
+    }
+    if (signals.hasBrk) {
+      this.outputSignals_.break = signals.brk;
+    }
+    return { success: true };
+  }
+
+  async configurePort(options) {
+    this.options_ = options;
+    return { success: true };
+  }
+
+  async getPortInfo() {
+    return {
+      bitrate: this.options_.bitrate,
+      dataBits: this.options_.datBits,
+      parityBit: this.options_.parityBit,
+      stopBits: this.options_.stopBits,
+      ctsFlowControl:
+          this.options_.hasCtsFlowControl && this.options_.ctsFlowControl,
+    };
+  }
+
+  async close() {
+    // OS typically clears DTR on close.
+    this.outputSignals_.dataTerminalReady = false;
+    if (this.writer_) {
+      this.writer_.close();
+      this.writer_.releaseLock();
+      this.writer_ = undefined;
+    }
+    this.writable_ = undefined;
+
+    // Close the receiver asynchronously so the reply to this message can be
+    // sent first.
+    const receiver = this.receiver_;
+    this.receiver_ = undefined;
+    setTimeout(() => {
+      receiver.$.close();
+    }, 0);
+
+    return {};
+  }
+}
+
+// Implementation of blink.mojom.SerialService.
+class FakeSerialService {
+  constructor() {
+    this.interceptor_ =
+        new MojoInterfaceInterceptor(SerialService.$interfaceName);
+    this.interceptor_.oninterfacerequest = e => this.bind(e.handle);
+    this.receiver_ = new SerialServiceReceiver(this);
+    this.clients_ = [];
+    this.nextToken_ = 0;
+    this.reset();
+  }
+
+  start() {
+    this.interceptor_.start();
+  }
+
+  stop() {
+    this.interceptor_.stop();
+  }
+
+  reset() {
+    this.ports_ = new Map();
+    this.selectedPort_ = null;
+  }
+
+  addPort(info) {
+    let portInfo = {};
+    if (info?.usbVendorId !== undefined) {
+      portInfo.hasUsbVendorId = true;
+      portInfo.usbVendorId = info.usbVendorId;
+    }
+    if (info?.usbProductId !== undefined) {
+      portInfo.hasUsbProductId = true;
+      portInfo.usbProductId = info.usbProductId;
+    }
+
+    let token = ++this.nextToken_;
+    portInfo.token = {high: 0n, low: BigInt(token)};
+
+    let record = {
+      portInfo: portInfo,
+      fakePort: new FakeSerialPort(),
+    };
+    this.ports_.set(token, record);
+
+    for (let client of this.clients_) {
+      client.onPortAdded(portInfo);
+    }
+
+    return token;
+  }
+
+  removePort(token) {
+    let record = this.ports_.get(token);
+    if (record === undefined) {
+      return;
+    }
+
+    this.ports_.delete(token);
+
+    for (let client of this.clients_) {
+      client.onPortRemoved(record.portInfo);
+    }
+  }
+
+  setSelectedPort(token) {
+    this.selectedPort_ = this.ports_.get(token);
+  }
+
+  getFakePort(token) {
+    let record = this.ports_.get(token);
+    if (record === undefined)
+      return undefined;
+    return record.fakePort;
+  }
+
+  bind(handle) {
+    this.receiver_.$.bindHandle(handle);
+  }
+
+  async setClient(client_remote) {
+    this.clients_.push(client_remote);
+  }
+
+  async getPorts() {
+    return {
+      ports: Array.from(this.ports_, ([token, record]) => record.portInfo)
+    };
+  }
+
+  async requestPort(filters) {
+    if (this.selectedPort_)
+      return { port: this.selectedPort_.portInfo };
+    else
+      return { port: null };
+  }
+
+  async openPort(token, options, client) {
+    let record = this.ports_.get(Number(token.low));
+    if (record !== undefined) {
+      return {port: record.fakePort.open(options, client)};
+    } else {
+      return {port: null};
+    }
+  }
+
+  async forgetPort(token) {
+    let record = this.ports_.get(Number(token.low));
+    if (record === undefined) {
+      return {success: false};
+    }
+
+    this.ports_.delete(Number(token.low));
+    if (record.fakePort.receiver_) {
+      record.fakePort.receiver_.$.close();
+      record.fakePort.receiver_ = undefined;
+    }
+    return {success: true};
+  }
+}
+
+export const fakeSerialService = new FakeSerialService();
diff --git a/test/wpt/tests/resources/chromium/generic_sensor_mocks.js b/test/wpt/tests/resources/chromium/generic_sensor_mocks.js
new file mode 100644
index 00000000000..98a29c2104f
--- /dev/null
+++ b/test/wpt/tests/resources/chromium/generic_sensor_mocks.js
@@ -0,0 +1,519 @@
+import {ReportingMode, Sensor, SensorClientRemote, SensorReceiver, SensorRemote, SensorType} from '/gen/services/device/public/mojom/sensor.mojom.m.js';
+import {SensorCreationResult, SensorInitParams_READ_BUFFER_SIZE_FOR_TESTS, SensorProvider, SensorProviderReceiver} from '/gen/services/device/public/mojom/sensor_provider.mojom.m.js';
+
+// A "sliding window" that iterates over |data| and returns one item at a
+// time, advancing and wrapping around as needed. |data| must be an array of
+// arrays.
+self.RingBuffer = class {
+  constructor(data) {
+    this.bufferPosition_ = 0;
+    // Validate |data|'s format and deep-copy every element.
+    this.data_ = Array.from(data, element => {
+      if (!Array.isArray(element)) {
+        throw new TypeError('Every |data| element must be an array.');
+      }
+      return Array.from(element);
+    })
+  }
+
+  next() {
+    const value = this.data_[this.bufferPosition_];
+    this.bufferPosition_ = (this.bufferPosition_ + 1) % this.data_.length;
+    return { done: false, value: value };
+  }
+
+  value() {
+    return this.data_[this.bufferPosition_];
+  }
+
+  [Symbol.iterator]() {
+    return this;
+  }
+};
+
+class DefaultSensorTraits {
+  // https://w3c.github.io/sensors/#threshold-check-algorithm
+  static isSignificantlyDifferent(reading1, reading2) {
+    return true;
+  }
+
+  // https://w3c.github.io/sensors/#reading-quantization-algorithm
+  static roundToMultiple(reading) {
+    return reading;
+  }
+
+  // https://w3c.github.io/ambient-light/#ambient-light-threshold-check-algorithm
+  static areReadingsEqual(reading1, reading2) {
+    return false;
+  }
+}
+
+class AmbientLightSensorTraits extends DefaultSensorTraits {
+  // https://w3c.github.io/ambient-light/#reduce-sensor-accuracy
+  static #ROUNDING_MULTIPLE = 50;
+  static #SIGNIFICANCE_THRESHOLD = 25;
+
+  // https://w3c.github.io/ambient-light/#ambient-light-threshold-check-algorithm
+  static isSignificantlyDifferent([illuminance1], [illuminance2]) {
+    return Math.abs(illuminance1 - illuminance2) >=
+        this.#SIGNIFICANCE_THRESHOLD;
+  }
+
+  // https://w3c.github.io/ambient-light/#ambient-light-reading-quantization-algorithm
+  static roundToMultiple(reading) {
+    const illuminance = reading[0];
+    const scaledValue =
+        illuminance / AmbientLightSensorTraits.#ROUNDING_MULTIPLE;
+    let roundedReading = reading.splice();
+
+    if (illuminance < 0.0) {
+      roundedReading[0] = -AmbientLightSensorTraits.#ROUNDING_MULTIPLE *
+          Math.floor(-scaledValue + 0.5);
+    } else {
+      roundedReading[0] = AmbientLightSensorTraits.#ROUNDING_MULTIPLE *
+          Math.floor(scaledValue + 0.5);
+    }
+
+    return roundedReading;
+  }
+
+  // https://w3c.github.io/ambient-light/#ambient-light-threshold-check-algorithm
+  static areReadingsEqual([illuminance1], [illuminance2]) {
+    return illuminance1 === illuminance2;
+  }
+}
+
+self.GenericSensorTest = (() => {
+  // Default sensor frequency in default configurations.
+  const DEFAULT_FREQUENCY = 5;
+
+  // Class that mocks Sensor interface defined in
+  // https://cs.chromium.org/chromium/src/services/device/public/mojom/sensor.mojom
+  class MockSensor {
+    static #BUFFER_OFFSET_TIMESTAMP = 1;
+    static #BUFFER_OFFSET_READINGS = 2;
+
+    constructor(sensorRequest, buffer, reportingMode, sensorType) {
+      this.client_ = null;
+      this.startShouldFail_ = false;
+      this.notifyOnReadingChange_ = true;
+      this.reportingMode_ = reportingMode;
+      this.sensorType_ = sensorType;
+      this.sensorReadingTimerId_ = null;
+      this.readingData_ = null;
+      this.requestedFrequencies_ = [];
+      // The Blink implementation (third_party/blink/renderer/modules/sensor/sensor.cc)
+      // sets a timestamp by creating a DOMHighResTimeStamp from a given platform timestamp.
+      // In this mock implementation we use a starting value
+      // and an increment step value that resemble a platform timestamp reasonably enough.
+      this.timestamp_ = window.performance.timeOrigin;
+      // |buffer| represents a SensorReadingSharedBuffer on the C++ side in
+      // Chromium. It consists, in this order, of a
+      // SensorReadingField<OneWriterSeqLock> (an 8-byte union that includes
+      // 32-bit integer used by the lock class), and a SensorReading consisting
+      // of an 8-byte timestamp and 4 8-byte reading fields.
+      //
+      // |this.buffer_[0]| is zeroed by default, which allows OneWriterSeqLock
+      // to work with our custom memory buffer that did not actually create a
+      // OneWriterSeqLock instance. It is never changed manually here.
+      //
+      // Use MockSensor.#BUFFER_OFFSET_TIMESTAMP and
+      // MockSensor.#BUFFER_OFFSET_READINGS to access the other positions in
+      // |this.buffer_| without having to hardcode magic numbers in the code.
+      this.buffer_ = buffer;
+      this.buffer_.fill(0);
+      this.receiver_ = new SensorReceiver(this);
+      this.receiver_.$.bindHandle(sensorRequest.handle);
+      this.lastRawReading_ = null;
+      this.lastRoundedReading_ = null;
+
+      if (sensorType == SensorType.AMBIENT_LIGHT) {
+        this.sensorTraits = AmbientLightSensorTraits;
+      } else {
+        this.sensorTraits = DefaultSensorTraits;
+      }
+    }
+
+    // Returns default configuration.
+    async getDefaultConfiguration() {
+      return { frequency: DEFAULT_FREQUENCY };
+    }
+
+    // Adds configuration for the sensor and starts reporting fake data
+    // through setSensorReading function.
+    async addConfiguration(configuration) {
+      this.requestedFrequencies_.push(configuration.frequency);
+      // Sort using descending order.
+      this.requestedFrequencies_.sort(
+          (first, second) => { return second - first });
+
+      if (!this.startShouldFail_ )
+        this.startReading();
+
+      return { success: !this.startShouldFail_ };
+    }
+
+    // Removes sensor configuration from the list of active configurations and
+    // stops notification about sensor reading changes if
+    // requestedFrequencies_ is empty.
+    removeConfiguration(configuration) {
+      const index = this.requestedFrequencies_.indexOf(configuration.frequency);
+      if (index == -1)
+        return;
+
+      this.requestedFrequencies_.splice(index, 1);
+      if (this.requestedFrequencies_.length === 0)
+        this.stopReading();
+    }
+
+    // ConfigureReadingChangeNotifications(bool enabled)
+    // Configures whether to report a reading change when in ON_CHANGE
+    // reporting mode.
+    configureReadingChangeNotifications(notifyOnReadingChange) {
+      this.notifyOnReadingChange_ = notifyOnReadingChange;
+    }
+
+    resume() {
+      this.startReading();
+    }
+
+    suspend() {
+      this.stopReading();
+    }
+
+    // Mock functions
+
+    // Resets mock Sensor state.
+    reset() {
+      this.stopReading();
+      this.startShouldFail_ = false;
+      this.requestedFrequencies_ = [];
+      this.notifyOnReadingChange_ = true;
+      this.readingData_ = null;
+      this.buffer_.fill(0);
+      this.receiver_.$.close();
+      this.lastRawReading_ = null;
+      this.lastRoundedReading_ = null;
+    }
+
+    // Sets fake data that is used to deliver sensor reading updates.
+    setSensorReading(readingData) {
+      this.readingData_ = new RingBuffer(readingData);
+    }
+
+    // This is a workaround to accommodate Blink's Device Orientation
+    // implementation. In general, all tests should use setSensorReading()
+    // instead.
+    setSensorReadingImmediately(readingData) {
+      this.setSensorReading(readingData);
+
+      const reading = this.readingData_.value();
+      this.buffer_.set(reading, MockSensor.#BUFFER_OFFSET_READINGS);
+      this.buffer_[MockSensor.#BUFFER_OFFSET_TIMESTAMP] = this.timestamp_++;
+    }
+
+    // Sets flag that forces sensor to fail when addConfiguration is invoked.
+    setStartShouldFail(shouldFail) {
+      this.startShouldFail_ = shouldFail;
+    }
+
+    startReading() {
+      if (this.readingData_ != null) {
+        this.stopReading();
+      }
+      let maxFrequencyUsed = this.requestedFrequencies_[0];
+      let timeout = (1 / maxFrequencyUsed) * 1000;
+      this.sensorReadingTimerId_ = window.setInterval(() => {
+        if (this.readingData_) {
+          // |buffer_| is a TypedArray, so we need to make sure pass an
+          // array to set().
+          const reading = this.readingData_.next().value;
+          if (!Array.isArray(reading)) {
+            throw new TypeError("startReading(): The readings passed to " +
+              "setSensorReading() must be arrays");
+          }
+
+          if (this.reportingMode_ == ReportingMode.ON_CHANGE &&
+              this.lastRawReading_ !== null &&
+              !this.sensorTraits.isSignificantlyDifferent(
+                  this.lastRawReading_, reading)) {
+            // In case new value is not significantly different compared to
+            // old value, new value is not sent.
+            return;
+          }
+
+          this.lastRawReading_ = reading.slice();
+          const roundedReading = this.sensorTraits.roundToMultiple(reading);
+
+          if (this.reportingMode_ == ReportingMode.ON_CHANGE &&
+              this.lastRoundedReading_ !== null &&
+              this.sensorTraits.areReadingsEqual(
+                roundedReading, this.lastRoundedReading_)) {
+            // In case new rounded value is not different compared to old
+            // value, new value is not sent.
+            return;
+          }
+          this.buffer_.set(roundedReading, MockSensor.#BUFFER_OFFSET_READINGS);
+          this.lastRoundedReading_ = roundedReading;
+        }
+
+        // For all tests sensor reading should have monotonically
+        // increasing timestamp.
+        this.buffer_[MockSensor.#BUFFER_OFFSET_TIMESTAMP] = this.timestamp_++;
+
+        if (this.reportingMode_ === ReportingMode.ON_CHANGE &&
+            this.notifyOnReadingChange_) {
+          this.client_.sensorReadingChanged();
+        }
+      }, timeout);
+    }
+
+    stopReading() {
+      if (this.sensorReadingTimerId_ != null) {
+        window.clearInterval(this.sensorReadingTimerId_);
+        this.sensorReadingTimerId_ = null;
+      }
+    }
+
+    getSamplingFrequency() {
+      if (this.requestedFrequencies_.length == 0) {
+        throw new Error("getSamplingFrequency(): No configured frequency");
+      }
+       return this.requestedFrequencies_[0];
+    }
+
+    isReadingData() {
+      return this.sensorReadingTimerId_ != null;
+    }
+  }
+
+  // Class that mocks SensorProvider interface defined in
+  // https://cs.chromium.org/chromium/src/services/device/public/mojom/sensor_provider.mojom
+  class MockSensorProvider {
+    constructor() {
+      this.readingSizeInBytes_ =
+          Number(SensorInitParams_READ_BUFFER_SIZE_FOR_TESTS);
+      this.sharedBufferSizeInBytes_ =
+          this.readingSizeInBytes_ * (SensorType.MAX_VALUE + 1);
+      let rv = Mojo.createSharedBuffer(this.sharedBufferSizeInBytes_);
+      if (rv.result != Mojo.RESULT_OK) {
+        throw new Error('MockSensorProvider: Failed to create shared buffer');
+      }
+      const handle = rv.handle;
+      rv = handle.mapBuffer(0, this.sharedBufferSizeInBytes_);
+      if (rv.result != Mojo.RESULT_OK) {
+        throw new Error("MockSensorProvider: Failed to map shared buffer");
+      }
+      this.shmemArrayBuffer_ = rv.buffer;
+      rv = handle.duplicateBufferHandle({readOnly: true});
+      if (rv.result != Mojo.RESULT_OK) {
+        throw new Error(
+            'MockSensorProvider: failed to duplicate shared buffer');
+      }
+      this.readOnlySharedBufferHandle_ = rv.handle;
+      this.activeSensors_ = new Map();
+      this.resolveFuncs_ = new Map();
+      this.getSensorShouldFail_ = new Map();
+      this.permissionsDenied_ = new Map();
+      this.maxFrequency_ = 60;
+      this.minFrequency_ = 1;
+      this.mojomSensorType_ = new Map([
+        ['Accelerometer', SensorType.ACCELEROMETER],
+        ['LinearAccelerationSensor', SensorType.LINEAR_ACCELERATION],
+        ['GravitySensor', SensorType.GRAVITY],
+        ['AmbientLightSensor', SensorType.AMBIENT_LIGHT],
+        ['Gyroscope', SensorType.GYROSCOPE],
+        ['Magnetometer', SensorType.MAGNETOMETER],
+        ['AbsoluteOrientationSensor',
+            SensorType.ABSOLUTE_ORIENTATION_QUATERNION],
+        ['AbsoluteOrientationEulerAngles',
+            SensorType.ABSOLUTE_ORIENTATION_EULER_ANGLES],
+        ['RelativeOrientationSensor',
+            SensorType.RELATIVE_ORIENTATION_QUATERNION],
+        ['RelativeOrientationEulerAngles',
+            SensorType.RELATIVE_ORIENTATION_EULER_ANGLES],
+        ['ProximitySensor', SensorType.PROXIMITY]
+      ]);
+      this.receiver_ = new SensorProviderReceiver(this);
+
+      this.interceptor_ =
+          new MojoInterfaceInterceptor(SensorProvider.$interfaceName);
+      this.interceptor_.oninterfacerequest = e => {
+        this.bindToPipe(e.handle);
+      };
+      this.interceptor_.start();
+    }
+
+    // Returns initialized Sensor proxy to the client.
+    async getSensor(type) {
+      if (this.getSensorShouldFail_.get(type)) {
+        return {result: SensorCreationResult.ERROR_NOT_AVAILABLE,
+                initParams: null};
+      }
+      if (this.permissionsDenied_.get(type)) {
+        return {result: SensorCreationResult.ERROR_NOT_ALLOWED,
+                initParams: null};
+      }
+
+      const offset = type * this.readingSizeInBytes_;
+      const reportingMode = ReportingMode.ON_CHANGE;
+
+      const sensor = new SensorRemote();
+      if (!this.activeSensors_.has(type)) {
+        const shmemView = new Float64Array(
+            this.shmemArrayBuffer_, offset,
+            this.readingSizeInBytes_ / Float64Array.BYTES_PER_ELEMENT);
+        const mockSensor = new MockSensor(
+            sensor.$.bindNewPipeAndPassReceiver(), shmemView, reportingMode,
+            type);
+        this.activeSensors_.set(type, mockSensor);
+        this.activeSensors_.get(type).client_ = new SensorClientRemote();
+      }
+
+      const rv = this.readOnlySharedBufferHandle_.duplicateBufferHandle(
+          {readOnly: true});
+      if (rv.result != Mojo.RESULT_OK) {
+        throw new Error('getSensor(): failed to duplicate shared buffer');
+      }
+
+      const defaultConfig = { frequency: DEFAULT_FREQUENCY };
+      // Consider sensor traits to meet assertions in C++ code (see
+      // services/device/public/cpp/generic_sensor/sensor_traits.h)
+      if (type == SensorType.AMBIENT_LIGHT || type == SensorType.MAGNETOMETER) {
+        this.maxFrequency_ = Math.min(10, this.maxFrequency_);
+      }
+
+      const client = this.activeSensors_.get(type).client_;
+      const initParams = {
+        sensor,
+        clientReceiver: client.$.bindNewPipeAndPassReceiver(),
+        memory: {buffer: rv.handle},
+        bufferOffset: BigInt(offset),
+        mode: reportingMode,
+        defaultConfiguration: defaultConfig,
+        minimumFrequency: this.minFrequency_,
+        maximumFrequency: this.maxFrequency_
+      };
+
+      if (this.resolveFuncs_.has(type)) {
+        for (let resolveFunc of this.resolveFuncs_.get(type)) {
+          resolveFunc(this.activeSensors_.get(type));
+        }
+        this.resolveFuncs_.delete(type);
+      }
+
+      return {result: SensorCreationResult.SUCCESS, initParams};
+    }
+
+    // Binds object to mojo message pipe
+    bindToPipe(pipe) {
+      this.receiver_.$.bindHandle(pipe);
+    }
+
+    // Mock functions
+
+    // Resets state of mock SensorProvider between test runs.
+    reset() {
+      for (const sensor of this.activeSensors_.values()) {
+        sensor.reset();
+      }
+      this.activeSensors_.clear();
+      this.resolveFuncs_.clear();
+      this.getSensorShouldFail_.clear();
+      this.permissionsDenied_.clear();
+      this.maxFrequency_ = 60;
+      this.minFrequency_ = 1;
+      this.receiver_.$.close();
+      this.interceptor_.stop();
+    }
+
+    // Sets flag that forces mock SensorProvider to fail when getSensor() is
+    // invoked.
+    setGetSensorShouldFail(sensorType, shouldFail) {
+      this.getSensorShouldFail_.set(this.mojomSensorType_.get(sensorType),
+          shouldFail);
+    }
+
+    setPermissionsDenied(sensorType, permissionsDenied) {
+      this.permissionsDenied_.set(this.mojomSensorType_.get(sensorType),
+          permissionsDenied);
+    }
+
+    // Returns mock sensor that was created in getSensor to the layout test.
+    getCreatedSensor(sensorType) {
+      const type = this.mojomSensorType_.get(sensorType);
+      if (typeof type != "number") {
+        throw new TypeError(`getCreatedSensor(): Invalid sensor type ${sensorType}`);
+      }
+
+      if (this.activeSensors_.has(type)) {
+        return Promise.resolve(this.activeSensors_.get(type));
+      }
+
+      return new Promise(resolve => {
+        if (!this.resolveFuncs_.has(type)) {
+          this.resolveFuncs_.set(type, []);
+        }
+        this.resolveFuncs_.get(type).push(resolve);
+      });
+    }
+
+    // Sets the maximum frequency for a concrete sensor.
+    setMaximumSupportedFrequency(frequency) {
+      this.maxFrequency_ = frequency;
+    }
+
+    // Sets the minimum frequency for a concrete sensor.
+    setMinimumSupportedFrequency(frequency) {
+      this.minFrequency_ = frequency;
+    }
+  }
+
+  let testInternal = {
+    initialized: false,
+    sensorProvider: null
+  }
+
+  class GenericSensorTestChromium {
+    constructor() {
+      Object.freeze(this); // Make it immutable.
+    }
+
+    async initialize() {
+      if (testInternal.initialized)
+        throw new Error('Call reset() before initialize().');
+
+      // Grant sensor permissions for Chromium testdriver.
+      // testdriver.js only works in the top-level browsing context, so do
+      // nothing if we're in e.g. an iframe.
+      if (window.parent === window) {
+        for (const entry
+                 of ['accelerometer', 'gyroscope', 'magnetometer',
+                     'ambient-light-sensor']) {
+          await test_driver.set_permission({name: entry}, 'granted');
+        }
+      }
+
+      testInternal.sensorProvider = new MockSensorProvider;
+      testInternal.initialized = true;
+    }
+    // Resets state of sensor mocks between test runs.
+    async reset() {
+      if (!testInternal.initialized)
+        throw new Error('Call initialize() before reset().');
+      testInternal.sensorProvider.reset();
+      testInternal.sensorProvider = null;
+      testInternal.initialized = false;
+
+      // Wait for an event loop iteration to let any pending mojo commands in
+      // the sensor provider finish.
+      await new Promise(resolve => setTimeout(resolve, 0));
+    }
+
+    getSensorProvider() {
+      return testInternal.sensorProvider;
+    }
+  }
+
+  return GenericSensorTestChromium;
+})();
diff --git a/test/wpt/tests/resources/chromium/generic_sensor_mocks.js.headers b/test/wpt/tests/resources/chromium/generic_sensor_mocks.js.headers
new file mode 100644
index 00000000000..6805c323df5
--- /dev/null
+++ b/test/wpt/tests/resources/chromium/generic_sensor_mocks.js.headers
@@ -0,0 +1 @@
+Content-Type: text/javascript; charset=utf-8
diff --git a/test/wpt/tests/resources/chromium/mock-barcodedetection.js b/test/wpt/tests/resources/chromium/mock-barcodedetection.js
new file mode 100644
index 00000000000..b0d2e0af0ae
--- /dev/null
+++ b/test/wpt/tests/resources/chromium/mock-barcodedetection.js
@@ -0,0 +1,136 @@
+import {BarcodeDetectionReceiver, BarcodeFormat} from '/gen/services/shape_detection/public/mojom/barcodedetection.mojom.m.js';
+import {BarcodeDetectionProvider, BarcodeDetectionProviderReceiver} from '/gen/services/shape_detection/public/mojom/barcodedetection_provider.mojom.m.js';
+
+self.BarcodeDetectionTest = (() => {
+  // Class that mocks BarcodeDetectionProvider interface defined in
+  // https://cs.chromium.org/chromium/src/services/shape_detection/public/mojom/barcodedetection_provider.mojom
+  class MockBarcodeDetectionProvider {
+    constructor() {
+      this.receiver_ = new BarcodeDetectionProviderReceiver(this);
+
+      this.interceptor_ = new MojoInterfaceInterceptor(
+          BarcodeDetectionProvider.$interfaceName);
+      this.interceptor_.oninterfacerequest = e => {
+        if (this.should_close_pipe_on_request_)
+          e.handle.close();
+        else
+          this.receiver_.$.bindHandle(e.handle);
+      }
+      this.interceptor_.start();
+      this.should_close_pipe_on_request_ = false;
+    }
+
+    createBarcodeDetection(request, options) {
+      this.mockService_ = new MockBarcodeDetection(request, options);
+    }
+
+    enumerateSupportedFormats() {
+      return {
+        supportedFormats: [
+          BarcodeFormat.AZTEC,
+          BarcodeFormat.DATA_MATRIX,
+          BarcodeFormat.QR_CODE,
+        ]
+      };
+    }
+
+    getFrameData() {
+      return this.mockService_.bufferData_;
+    }
+
+    getFormats() {
+     return this.mockService_.options_.formats;
+    }
+
+    reset() {
+      this.mockService_ = null;
+      this.should_close_pipe_on_request_ = false;
+      this.receiver_.$.close();
+      this.interceptor_.stop();
+    }
+
+    // simulate a 'no implementation available' case
+    simulateNoImplementation() {
+      this.should_close_pipe_on_request_ = true;
+    }
+  }
+
+  // Class that mocks BarcodeDetection interface defined in
+  // https://cs.chromium.org/chromium/src/services/shape_detection/public/mojom/barcodedetection.mojom
+  class MockBarcodeDetection {
+    constructor(request, options) {
+      this.options_ = options;
+      this.receiver_ = new BarcodeDetectionReceiver(this);
+      this.receiver_.$.bindHandle(request.handle);
+    }
+
+    detect(bitmapData) {
+      this.bufferData_ =
+          new Uint32Array(getArrayBufferFromBigBuffer(bitmapData.pixelData));
+      return {
+        results: [
+          {
+            rawValue : "cats",
+            boundingBox: { x: 1.0, y: 1.0, width: 100.0, height: 100.0 },
+            format: BarcodeFormat.QR_CODE,
+            cornerPoints: [
+              { x: 1.0, y: 1.0 },
+              { x: 101.0, y: 1.0 },
+              { x: 101.0, y: 101.0 },
+              { x: 1.0, y: 101.0 }
+            ],
+          },
+          {
+            rawValue : "dogs",
+            boundingBox: { x: 2.0, y: 2.0, width: 50.0, height: 50.0 },
+            format: BarcodeFormat.CODE_128,
+            cornerPoints: [
+              { x: 2.0, y: 2.0 },
+              { x: 52.0, y: 2.0 },
+              { x: 52.0, y: 52.0 },
+              { x: 2.0, y: 52.0 }
+            ],
+          },
+        ],
+      };
+    }
+  }
+
+  let testInternal = {
+    initialized: false,
+    MockBarcodeDetectionProvider: null
+  }
+
+  class BarcodeDetectionTestChromium {
+    constructor() {
+      Object.freeze(this); // Make it immutable.
+    }
+
+    initialize() {
+      if (testInternal.initialized)
+        throw new Error('Call reset() before initialize().');
+
+      testInternal.MockBarcodeDetectionProvider = new MockBarcodeDetectionProvider;
+      testInternal.initialized = true;
+    }
+
+    // Resets state of barcode detection mocks between test runs.
+    async reset() {
+      if (!testInternal.initialized)
+        throw new Error('Call initialize() before reset().');
+      testInternal.MockBarcodeDetectionProvider.reset();
+      testInternal.MockBarcodeDetectionProvider = null;
+      testInternal.initialized = false;
+
+      await new Promise(resolve => setTimeout(resolve, 0));
+    }
+
+    MockBarcodeDetectionProvider() {
+      return testInternal.MockBarcodeDetectionProvider;
+    }
+  }
+
+  return BarcodeDetectionTestChromium;
+})();
+
+self.BarcodeFormat = BarcodeFormat;
diff --git a/test/wpt/tests/resources/chromium/mock-barcodedetection.js.headers b/test/wpt/tests/resources/chromium/mock-barcodedetection.js.headers
new file mode 100644
index 00000000000..6c61a34a4ec
--- /dev/null
+++ b/test/wpt/tests/resources/chromium/mock-barcodedetection.js.headers
@@ -0,0 +1 @@
+Content-Type: text/javascript; charset=utf-8
\ No newline at end of file
diff --git a/test/wpt/tests/resources/chromium/mock-direct-sockets.js b/test/wpt/tests/resources/chromium/mock-direct-sockets.js
new file mode 100644
index 00000000000..6d557f7a015
--- /dev/null
+++ b/test/wpt/tests/resources/chromium/mock-direct-sockets.js
@@ -0,0 +1,94 @@
+'use strict';
+
+import {DirectSocketsService, DirectSocketsServiceReceiver} from '/gen/third_party/blink/public/mojom/direct_sockets/direct_sockets.mojom.m.js';
+
+self.DirectSocketsServiceTest = (() => {
+  // Class that mocks DirectSocketsService interface defined in
+  // https://source.chromium.org/chromium/chromium/src/third_party/blink/public/mojom/direct_sockets/direct_sockets.mojom
+  class MockDirectSocketsService {
+    constructor() {
+      this.interceptor_ = new MojoInterfaceInterceptor(DirectSocketsService.$interfaceName);
+      this.receiver_ = new DirectSocketsServiceReceiver(this);
+      this.interceptor_.oninterfacerequest = e =>
+          this.receiver_.$.bindHandle(e.handle);
+      this.interceptor_.start();
+    }
+
+    reset() {
+      this.receiver_.$.close();
+      this.interceptor_.stop();
+    }
+
+    openTCPSocket(
+      options,
+      receiver,
+      observer) {
+      return Promise.resolve({
+        // return result = net:Error::NOT_IMPLEMENTED (code -11)
+        result: -11
+      });
+    }
+
+    openConnectedUDPSocket(
+      options,
+      receiver,
+      listener) {
+      return Promise.resolve({
+        // return result = net:Error::NOT_IMPLEMENTED (code -11)
+        result: -11
+      });
+    }
+
+    openBoundUDPSocket(
+      options,
+      receiver,
+      listener) {
+      return Promise.resolve({
+        // return result = net:Error::NOT_IMPLEMENTED (code -11)
+        result: -11
+      });
+    }
+
+    openTCPServerSocket(
+      options,
+      receiver) {
+      return Promise.resolve({
+        // return result = net:Error::NOT_IMPLEMENTED (code -11)
+        result: -11
+      });
+    }
+  }
+
+  let testInternal = {
+    initialized: false,
+    mockDirectSocketsService: null
+  }
+
+  class DirectSocketsServiceTestChromium {
+    constructor() {
+      Object.freeze(this);  // Make it immutable.
+    }
+
+    initialize() {
+      if (!testInternal.initialized) {
+        testInternal = {
+          mockDirectSocketsService: new MockDirectSocketsService(),
+          initialized: true
+        };
+      }
+    }
+
+    async reset() {
+      if (testInternal.initialized) {
+        testInternal.mockDirectSocketsService.reset();
+        testInternal = {
+          mockDirectSocketsService: null,
+          initialized: false
+        };
+        await new Promise(resolve => setTimeout(resolve, 0));
+      }
+    }
+  }
+
+  return DirectSocketsServiceTestChromium;
+})();
diff --git a/test/wpt/tests/resources/chromium/mock-facedetection.js b/test/wpt/tests/resources/chromium/mock-facedetection.js
new file mode 100644
index 00000000000..7ae658621ee
--- /dev/null
+++ b/test/wpt/tests/resources/chromium/mock-facedetection.js
@@ -0,0 +1,130 @@
+import {FaceDetectionReceiver, LandmarkType} from '/gen/services/shape_detection/public/mojom/facedetection.mojom.m.js';
+import {FaceDetectionProvider, FaceDetectionProviderReceiver} from '/gen/services/shape_detection/public/mojom/facedetection_provider.mojom.m.js';
+
+self.FaceDetectionTest = (() => {
+  // Class that mocks FaceDetectionProvider interface defined in
+  // https://cs.chromium.org/chromium/src/services/shape_detection/public/mojom/facedetection_provider.mojom
+  class MockFaceDetectionProvider {
+    constructor() {
+      this.receiver_ = new FaceDetectionProviderReceiver(this);
+
+      this.interceptor_ = new MojoInterfaceInterceptor(
+          FaceDetectionProvider.$interfaceName);
+      this.interceptor_.oninterfacerequest =
+         e => this.receiver_.$.bindHandle(e.handle);
+      this.interceptor_.start();
+    }
+
+    createFaceDetection(request, options) {
+      this.mockService_ = new MockFaceDetection(request, options);
+    }
+
+    getFrameData() {
+      return this.mockService_.bufferData_;
+    }
+
+    getMaxDetectedFaces() {
+     return this.mockService_.maxDetectedFaces_;
+    }
+
+    getFastMode () {
+      return this.mockService_.fastMode_;
+    }
+
+    reset() {
+      this.mockService_ = null;
+      this.receiver_.$.close();
+      this.interceptor_.stop();
+    }
+  }
+
+  // Class that mocks FaceDetection interface defined in
+  // https://cs.chromium.org/chromium/src/services/shape_detection/public/mojom/facedetection.mojom
+  class MockFaceDetection {
+    constructor(request, options) {
+      this.maxDetectedFaces_ = options.maxDetectedFaces;
+      this.fastMode_ = options.fastMode;
+      this.receiver_ = new FaceDetectionReceiver(this);
+      this.receiver_.$.bindHandle(request.handle);
+    }
+
+    detect(bitmapData) {
+      this.bufferData_ =
+          new Uint32Array(getArrayBufferFromBigBuffer(bitmapData.pixelData));
+      return Promise.resolve({
+        results: [
+          {
+            boundingBox: {x: 1.0, y: 1.0, width: 100.0, height: 100.0},
+            landmarks: [{
+              type: LandmarkType.EYE,
+              locations: [{x: 4.0, y: 5.0}]
+            },
+            {
+              type: LandmarkType.EYE,
+              locations: [
+                {x: 4.0, y: 5.0}, {x: 5.0, y: 4.0}, {x: 6.0, y: 3.0},
+                {x: 7.0, y: 4.0}, {x: 8.0, y: 5.0}, {x: 7.0, y: 6.0},
+                {x: 6.0, y: 7.0}, {x: 5.0, y: 6.0}
+              ]
+            }]
+          },
+          {
+            boundingBox: {x: 2.0, y: 2.0, width: 200.0, height: 200.0},
+            landmarks: [{
+              type: LandmarkType.NOSE,
+              locations: [{x: 100.0, y: 50.0}]
+            },
+            {
+              type: LandmarkType.NOSE,
+              locations: [
+                {x: 80.0, y: 50.0}, {x: 70.0, y: 60.0}, {x: 60.0, y: 70.0},
+                {x: 70.0, y: 60.0}, {x: 80.0, y: 70.0}, {x: 90.0, y: 80.0},
+                {x: 100.0, y: 70.0}, {x: 90.0, y: 60.0}, {x: 80.0, y: 50.0}
+              ]
+            }]
+          },
+          {
+            boundingBox: {x: 3.0, y: 3.0, width: 300.0, height: 300.0},
+            landmarks: []
+          },
+        ]
+      });
+    }
+  }
+
+  let testInternal = {
+    initialized: false,
+    MockFaceDetectionProvider: null
+  }
+
+  class FaceDetectionTestChromium {
+    constructor() {
+      Object.freeze(this); // Make it immutable.
+    }
+
+    initialize() {
+      if (testInternal.initialized)
+        throw new Error('Call reset() before initialize().');
+
+      testInternal.MockFaceDetectionProvider = new MockFaceDetectionProvider;
+      testInternal.initialized = true;
+    }
+
+    // Resets state of face detection mocks between test runs.
+    async reset() {
+      if (!testInternal.initialized)
+        throw new Error('Call initialize() before reset().');
+      testInternal.MockFaceDetectionProvider.reset();
+      testInternal.MockFaceDetectionProvider = null;
+      testInternal.initialized = false;
+
+      await new Promise(resolve => setTimeout(resolve, 0));
+    }
+
+    MockFaceDetectionProvider() {
+      return testInternal.MockFaceDetectionProvider;
+    }
+  }
+
+  return FaceDetectionTestChromium;
+})();
diff --git a/test/wpt/tests/resources/chromium/mock-facedetection.js.headers b/test/wpt/tests/resources/chromium/mock-facedetection.js.headers
new file mode 100644
index 00000000000..6c61a34a4ec
--- /dev/null
+++ b/test/wpt/tests/resources/chromium/mock-facedetection.js.headers
@@ -0,0 +1 @@
+Content-Type: text/javascript; charset=utf-8
\ No newline at end of file
diff --git a/test/wpt/tests/resources/chromium/mock-idle-detection.js b/test/wpt/tests/resources/chromium/mock-idle-detection.js
new file mode 100644
index 00000000000..54fe5dd01e8
--- /dev/null
+++ b/test/wpt/tests/resources/chromium/mock-idle-detection.js
@@ -0,0 +1,80 @@
+import {IdleManager, IdleManagerError, IdleManagerReceiver} from '/gen/third_party/blink/public/mojom/idle/idle_manager.mojom.m.js';
+
+/**
+ * This is a testing framework that enables us to test the user idle detection
+ * by intercepting the connection between the renderer and the browser and
+ * exposing a mocking API for tests.
+ *
+ * Usage:
+ *
+ * 1) Include <script src="mock.js"></script> in your file.
+ * 2) Set expectations
+ *   expect(addMonitor).andReturn((threshold, monitorPtr, callback) => {
+ *     // mock behavior
+ *   })
+ * 3) Call navigator.idle.query()
+ *
+ * The mocking API is blink agnostic and is designed such that other engines
+ * could implement it too. Here are the symbols that are exposed to tests:
+ *
+ * - function addMonitor(): the main/only function that can be mocked.
+ * - function expect(): the main/only function that enables us to mock it.
+ * - function close(): disconnects the interceptor.
+ * - enum UserIdleState {IDLE, ACTIVE}: blink agnostic constants.
+ * - enum ScreenIdleState {LOCKED, UNLOCKED}: blink agnostic constants.
+ */
+
+class FakeIdleMonitor {
+  addMonitor(threshold, monitorPtr, callback) {
+    return this.handler.addMonitor(threshold, monitorPtr);
+  }
+  setHandler(handler) {
+    this.handler = handler;
+    return this;
+  }
+  setBinding(binding) {
+    this.binding = binding;
+    return this;
+  }
+  close() {
+    this.binding.$.close();
+  }
+}
+
+self.IdleDetectorError = {};
+
+self.addMonitor = function addMonitor(threshold, monitorPtr, callback) {
+  throw new Error("expected to be overriden by tests");
+}
+
+async function close() {
+  interceptor.close();
+}
+
+self.expect = function(call) {
+  return {
+    andReturn(callback) {
+      let handler = {};
+      handler[call.name] = callback;
+      interceptor.setHandler(handler);
+    }
+  };
+};
+
+function intercept() {
+  let result = new FakeIdleMonitor();
+
+  let binding = new IdleManagerReceiver(result);
+  let interceptor = new MojoInterfaceInterceptor(IdleManager.$interfaceName);
+  interceptor.oninterfacerequest = e => binding.$.bindHandle(e.handle);
+  interceptor.start();
+
+  self.IdleDetectorError.SUCCESS = IdleManagerError.kSuccess;
+  self.IdleDetectorError.PERMISSION_DISABLED =
+      IdleManagerError.kPermissionDisabled;
+
+  result.setBinding(binding);
+  return result;
+}
+
+const interceptor = intercept();
diff --git a/test/wpt/tests/resources/chromium/mock-imagecapture.js b/test/wpt/tests/resources/chromium/mock-imagecapture.js
new file mode 100644
index 00000000000..8424e1e36c8
--- /dev/null
+++ b/test/wpt/tests/resources/chromium/mock-imagecapture.js
@@ -0,0 +1,309 @@
+import {BackgroundBlurMode, FillLightMode, ImageCapture, ImageCaptureReceiver, MeteringMode, RedEyeReduction} from '/gen/media/capture/mojom/image_capture.mojom.m.js';
+
+self.ImageCaptureTest = (() => {
+  // Class that mocks ImageCapture interface defined in
+  // https://cs.chromium.org/chromium/src/media/capture/mojom/image_capture.mojom
+  class MockImageCapture {
+    constructor() {
+      this.interceptor_ =
+          new MojoInterfaceInterceptor(ImageCapture.$interfaceName);
+      this.interceptor_.oninterfacerequest =
+        e => this.receiver_.$.bindHandle(e.handle);
+      this.interceptor_.start();
+
+      this.state_ = {
+        state: {
+          supportedWhiteBalanceModes: [
+            MeteringMode.SINGLE_SHOT,
+            MeteringMode.CONTINUOUS
+          ],
+          currentWhiteBalanceMode: MeteringMode.CONTINUOUS,
+          supportedExposureModes: [
+            MeteringMode.MANUAL,
+            MeteringMode.SINGLE_SHOT,
+            MeteringMode.CONTINUOUS
+          ],
+          currentExposureMode: MeteringMode.MANUAL,
+          supportedFocusModes: [
+            MeteringMode.MANUAL,
+            MeteringMode.SINGLE_SHOT
+          ],
+          currentFocusMode: MeteringMode.MANUAL,
+          pointsOfInterest: [{
+            x: 0.4,
+            y: 0.6
+          }],
+
+          exposureCompensation: {
+            min: -200.0,
+            max: 200.0,
+            current: 33.0,
+            step: 33.0
+          },
+          exposureTime: {
+            min: 100.0,
+            max: 100000.0,
+            current: 1000.0,
+            step: 100.0
+          },
+          colorTemperature: {
+            min: 2500.0,
+            max: 6500.0,
+            current: 6000.0,
+            step: 1000.0
+          },
+          iso: {
+            min: 100.0,
+            max: 12000.0,
+            current: 400.0,
+            step: 1.0
+          },
+
+          brightness: {
+            min: 1.0,
+            max: 10.0,
+            current: 5.0,
+            step: 1.0
+          },
+          contrast: {
+            min: 2.0,
+            max: 9.0,
+            current: 5.0,
+            step: 1.0
+          },
+          saturation: {
+            min: 3.0,
+            max: 8.0,
+            current: 6.0,
+            step: 1.0
+          },
+          sharpness: {
+            min: 4.0,
+            max: 7.0,
+            current: 7.0,
+            step: 1.0
+          },
+
+          focusDistance: {
+            min: 1.0,
+            max: 10.0,
+            current: 3.0,
+            step: 1.0
+          },
+
+          pan: {
+            min: 0.0,
+            max: 10.0,
+            current: 5.0,
+            step: 2.0
+          },
+
+          tilt: {
+            min: 0.0,
+            max: 10.0,
+            current: 5.0,
+            step: 2.0
+          },
+
+          zoom: {
+            min: 0.0,
+            max: 10.0,
+            current: 5.0,
+            step: 5.0
+          },
+
+          supportsTorch: true,
+          torch: false,
+
+          redEyeReduction: RedEyeReduction.CONTROLLABLE,
+          height: {
+            min: 240.0,
+            max: 2448.0,
+            current: 240.0,
+            step: 2.0
+          },
+          width: {
+            min: 320.0,
+            max: 3264.0,
+            current: 320.0,
+            step: 3.0
+          },
+          fillLightMode: [FillLightMode.AUTO, FillLightMode.FLASH],
+
+          supportedBackgroundBlurModes: [
+              BackgroundBlurMode.OFF,
+              BackgroundBlurMode.BLUR
+          ],
+          backgroundBlurMode: BackgroundBlurMode.OFF,
+        }
+      };
+      this.panTiltZoomPermissionStatus_ = null;
+      this.settings_ = null;
+      this.receiver_ = new ImageCaptureReceiver(this);
+    }
+
+    reset() {
+      this.receiver_.$.close();
+      this.interceptor_.stop();
+    }
+
+    async getPhotoState(source_id) {
+      const shouldKeepPanTiltZoom = await this.isPanTiltZoomPermissionGranted();
+      if (shouldKeepPanTiltZoom)
+        return Promise.resolve(this.state_);
+
+      const newState = {...this.state_};
+      newState.state.pan = {};
+      newState.state.tilt = {};
+      newState.state.zoom = {};
+      return Promise.resolve(newState);
+    }
+
+    async setPhotoOptions(source_id, settings) {
+      const isAllowedToControlPanTiltZoom = await this.isPanTiltZoomPermissionGranted();
+      if (!isAllowedToControlPanTiltZoom &&
+          (settings.hasPan || settings.hasTilt || settings.hasZoom)) {
+        return Promise.resolve({ success: false });
+      }
+      this.settings_ = settings;
+      if (settings.hasIso)
+        this.state_.state.iso.current = settings.iso;
+      if (settings.hasHeight)
+        this.state_.state.height.current = settings.height;
+      if (settings.hasWidth)
+        this.state_.state.width.current = settings.width;
+      if (settings.hasPan)
+        this.state_.state.pan.current = settings.pan;
+      if (settings.hasTilt)
+        this.state_.state.tilt.current = settings.tilt;
+      if (settings.hasZoom)
+        this.state_.state.zoom.current = settings.zoom;
+      if (settings.hasFocusMode)
+        this.state_.state.currentFocusMode = settings.focusMode;
+      if (settings.hasFocusDistance)
+        this.state_.state.focusDistance.current = settings.focusDistance;
+
+      if (settings.pointsOfInterest.length > 0) {
+        this.state_.state.pointsOfInterest =
+          settings.pointsOfInterest;
+      }
+
+      if (settings.hasExposureMode)
+        this.state_.state.currentExposureMode = settings.exposureMode;
+
+      if (settings.hasExposureCompensation) {
+        this.state_.state.exposureCompensation.current =
+          settings.exposureCompensation;
+      }
+      if (settings.hasExposureTime) {
+        this.state_.state.exposureTime.current =
+          settings.exposureTime;
+      }
+      if (settings.hasWhiteBalanceMode) {
+        this.state_.state.currentWhiteBalanceMode =
+          settings.whiteBalanceMode;
+      }
+      if (settings.hasFillLightMode)
+        this.state_.state.fillLightMode = [settings.fillLightMode];
+      if (settings.hasRedEyeReduction)
+        this.state_.state.redEyeReduction = settings.redEyeReduction;
+      if (settings.hasColorTemperature) {
+        this.state_.state.colorTemperature.current =
+          settings.colorTemperature;
+      }
+      if (settings.hasBrightness)
+        this.state_.state.brightness.current = settings.brightness;
+      if (settings.hasContrast)
+        this.state_.state.contrast.current = settings.contrast;
+      if (settings.hasSaturation)
+        this.state_.state.saturation.current = settings.saturation;
+      if (settings.hasSharpness)
+        this.state_.state.sharpness.current = settings.sharpness;
+
+      if (settings.hasTorch)
+        this.state_.state.torch = settings.torch;
+
+      if (settings.hasBackgroundBlurMode)
+        this.state_.state.backgroundBlurMode = [settings.backgroundBlurMode];
+
+      return Promise.resolve({
+        success: true
+      });
+    }
+
+    takePhoto(source_id) {
+      return Promise.resolve({
+        blob: {
+          mimeType: 'image/cat',
+          data: new Array(2)
+        }
+      });
+    }
+
+    async isPanTiltZoomPermissionGranted() {
+      if (!this.panTiltZoomPermissionStatus_) {
+        this.panTiltZoomPermissionStatus_ = await navigator.permissions.query({
+          name: "camera",
+          panTiltZoom: true
+        });
+      }
+      return this.panTiltZoomPermissionStatus_.state == "granted";
+    }
+
+    state() {
+      return this.state_.state;
+    }
+
+    turnOffBackgroundBlurMode() {
+      this.state_.state.backgroundBlurMode = BackgroundBlurMode.OFF;
+    }
+    turnOnBackgroundBlurMode() {
+      this.state_.state.backgroundBlurMode = BackgroundBlurMode.BLUR;
+    }
+    turnOffSupportedBackgroundBlurModes() {
+      this.state_.state.supportedBackgroundBlurModes = [BackgroundBlurMode.OFF];
+    }
+    turnOnSupportedBackgroundBlurModes() {
+      this.state_.state.supportedBackgroundBlurModes = [BackgroundBlurMode.BLUR];
+    }
+
+    options() {
+      return this.settings_;
+    }
+  }
+
+  let testInternal = {
+    initialized: false,
+    mockImageCapture: null
+  }
+
+  class ImageCaptureTestChromium {
+
+    constructor() {
+      Object.freeze(this); // Make it immutable.
+    }
+
+    initialize() {
+      if (testInternal.initialized)
+        throw new Error('Call reset() before initialize().');
+
+      testInternal.mockImageCapture = new MockImageCapture;
+      testInternal.initialized = true;
+    }
+    // Resets state of image capture mocks between test runs.
+    async reset() {
+      if (!testInternal.initialized)
+        throw new Error('Call initialize() before reset().');
+      testInternal.mockImageCapture.reset();
+      testInternal.mockImageCapture = null;
+      testInternal.initialized = false;
+
+      await new Promise(resolve => setTimeout(resolve, 0));
+    }
+    mockImageCapture() {
+      return testInternal.mockImageCapture;
+    }
+  }
+
+  return ImageCaptureTestChromium;
+})();
diff --git a/test/wpt/tests/resources/chromium/mock-managed-config.js b/test/wpt/tests/resources/chromium/mock-managed-config.js
new file mode 100644
index 00000000000..c9980e1285b
--- /dev/null
+++ b/test/wpt/tests/resources/chromium/mock-managed-config.js
@@ -0,0 +1,91 @@
+'use strict'
+
+import{ManagedConfigurationObserverRemote, ManagedConfigurationService, ManagedConfigurationServiceReceiver} from '/gen/third_party/blink/public/mojom/device/device.mojom.m.js';
+
+
+self.ManagedConfigTest = (() => {
+  // Class that mocks ManagedConfigurationService interface defined in
+  // https://source.chromium.org/chromium/chromium/src/third_party/blink/public/mojom/device/device.mojom
+  class MockManagedConfig {
+    constructor() {
+      this.receiver_ = new ManagedConfigurationServiceReceiver(this);
+      this.interceptor_ = new MojoInterfaceInterceptor(
+          ManagedConfigurationService.$interfaceName);
+      this.interceptor_.oninterfacerequest = e =>
+          this.receiver_.$.bindHandle(e.handle);
+      this.interceptor_.start();
+      this.subscription_ = null;
+      this.reset();
+    }
+
+    reset() {
+      this.configuration_ = null;
+      this.onObserverAdd_ = null;
+    }
+
+    async getManagedConfiguration(keys) {
+      if (this.configuration_ === null) {
+        return {};
+      }
+
+      return {
+        configurations: Object.keys(this.configuration_)
+                            .filter(key => keys.includes(key))
+                            .reduce(
+                                (obj, key) => {
+                                  obj[key] =
+                                      JSON.stringify(this.configuration_[key]);
+                                  return obj;
+                                },
+                                {})
+      };
+    }
+
+    subscribeToManagedConfiguration(remote) {
+      this.subscription_ = remote;
+      if (this.onObserverAdd_ !== null) {
+        this.onObserverAdd_();
+      }
+    }
+
+    setManagedConfig(value) {
+      this.configuration_ = value;
+      if (this.subscription_ !== null) {
+        this.subscription_.onConfigurationChanged();
+      }
+    }
+  }
+
+  let testInternal = {
+    initialized: false,
+    mockManagedConfig: null
+  }
+
+  class ManagedConfigTestChromium {
+    constructor() {
+      Object.freeze(this);  // Make it immutable.
+    }
+
+    initialize() {
+      if (testInternal.mockManagedConfig !== null) {
+        testInternal.mockManagedConfig.reset();
+        return;
+      }
+
+      testInternal.mockManagedConfig = new MockManagedConfig;
+      testInternal.initialized = true;
+    }
+
+    setManagedConfig(config) {
+      testInternal.mockManagedConfig.setManagedConfig(config);
+    }
+
+    async nextObserverAdded() {
+      await new Promise(resolve => {
+        testInternal.mockManagedConfig.onObserverAdd_ = resolve;
+      });
+    }
+  }
+
+  return ManagedConfigTestChromium;
+})();
diff --git a/test/wpt/tests/resources/chromium/mock-pressure-service.js b/test/wpt/tests/resources/chromium/mock-pressure-service.js
new file mode 100644
index 00000000000..91efe529f2a
--- /dev/null
+++ b/test/wpt/tests/resources/chromium/mock-pressure-service.js
@@ -0,0 +1,141 @@
+import {PressureManager, PressureManagerReceiver, PressureStatus} from '/gen/services/device/public/mojom/pressure_manager.mojom.m.js'
+import {PressureFactor, PressureState} from '/gen/services/device/public/mojom/pressure_update.mojom.m.js'
+
+class MockPressureService {
+  constructor() {
+    this.receiver_ = new PressureManagerReceiver(this);
+    this.interceptor_ =
+        new MojoInterfaceInterceptor(PressureManager.$interfaceName);
+    this.interceptor_.oninterfacerequest = e => {
+      this.receiver_.$.bindHandle(e.handle);
+    };
+    this.receiver_.onConnectionError.addListener(() => {
+      this.stopPlatformCollector();
+      this.observer_ = null;
+    });
+    this.reset();
+    this.mojomStateType_ = new Map([
+      ['nominal', PressureState.kNominal], ['fair', PressureState.kFair],
+      ['serious', PressureState.kSerious], ['critical', PressureState.kCritical]
+    ]);
+    this.mojomFactorType_ = new Map([
+      ['thermal', PressureFactor.kThermal],
+      ['power-supply', PressureFactor.kPowerSupply]
+    ]);
+    this.pressureServiceReadingTimerId_ = null;
+  }
+
+  start() {
+    this.interceptor_.start();
+  }
+
+  stop() {
+    this.stopPlatformCollector();
+    this.receiver_.$.close();
+    this.interceptor_.stop();
+
+    // Wait for an event loop iteration to let any pending mojo commands in
+    // the pressure service finish.
+    return new Promise(resolve => setTimeout(resolve, 0));
+  }
+
+  reset() {
+    this.observer_ = null;
+    this.pressureUpdate_ = null;
+    this.pressureServiceReadingTimerId_ = null;
+    this.pressureStatus_ = PressureStatus.kOk;
+    this.updatesDelivered_ = 0;
+  }
+
+  async addClient(observer) {
+    if (this.observer_ !== null)
+      throw new Error('BindObserver() has already been called');
+
+    this.observer_ = observer;
+    this.observer_.onConnectionError.addListener(() => {
+      this.stopPlatformCollector();
+      this.observer_ = null;
+    });
+
+    return {status: this.pressureStatus_};
+  }
+
+  startPlatformCollector(sampleRate) {
+    if (sampleRate === 0)
+      return;
+
+    if (this.pressureServiceReadingTimerId_ != null)
+      this.stopPlatformCollector();
+
+    // The following code for calculating the timestamp was taken from
+    // https://source.chromium.org/chromium/chromium/src/+/main:third_party/
+    // blink/web_tests/http/tests/resources/
+    // geolocation-mock.js;l=131;drc=37a9b6c03b9bda9fcd62fc0e5e8016c278abd31f
+
+    // The new Date().getTime() returns the number of milliseconds since the
+    // UNIX epoch (1970-01-01 00::00:00 UTC), while |internalValue| of the
+    // device.mojom.PressureUpdate represents the value of microseconds since
+    // the Windows FILETIME epoch (1601-01-01 00:00:00 UTC). So add the delta
+    // when sets the |internalValue|. See more info in //base/time/time.h.
+    const windowsEpoch = Date.UTC(1601, 0, 1, 0, 0, 0, 0);
+    const unixEpoch = Date.UTC(1970, 0, 1, 0, 0, 0, 0);
+    // |epochDeltaInMs| equals to base::Time::kTimeTToMicrosecondsOffset.
+    const epochDeltaInMs = unixEpoch - windowsEpoch;
+
+    const timeout = (1 / sampleRate) * 1000;
+    this.pressureServiceReadingTimerId_ = window.setInterval(() => {
+      if (this.pressureUpdate_ === null || this.observer_ === null)
+        return;
+      this.pressureUpdate_.timestamp = {
+        internalValue: BigInt((new Date().getTime() + epochDeltaInMs) * 1000)
+      };
+      this.observer_.onPressureUpdated(this.pressureUpdate_);
+      this.updatesDelivered_++;
+    }, timeout);
+  }
+
+  stopPlatformCollector() {
+    if (this.pressureServiceReadingTimerId_ != null) {
+      window.clearInterval(this.pressureServiceReadingTimerId_);
+      this.pressureServiceReadingTimerId_ = null;
+    }
+    this.updatesDelivered_ = 0;
+  }
+
+  updatesDelivered() {
+    return this.updatesDelivered_;
+  }
+
+  setPressureUpdate(state, factors) {
+    if (!this.mojomStateType_.has(state))
+      throw new Error(`PressureState '${state}' is invalid`);
+
+    let pressureFactors = [];
+    if (Array.isArray(factors)) {
+      for (const factor of factors) {
+        if (!this.mojomFactorType_.has(factor))
+          throw new Error(`PressureFactor '${factor}' is invalid`);
+        pressureFactors.push(this.mojomFactorType_.get(factor));
+      }
+    }
+
+    this.pressureUpdate_ = {
+      state: this.mojomStateType_.get(state),
+      factors: pressureFactors,
+    };
+  }
+
+  setExpectedFailure(expectedException) {
+    assert_true(
+        expectedException instanceof DOMException,
+        'setExpectedFailure() expects a DOMException instance');
+    if (expectedException.name === 'NotSupportedError') {
+      this.pressureStatus_ = PressureStatus.kNotSupported;
+    } else {
+      throw new TypeError(
+          `Unexpected DOMException '${expectedException.name}'`);
+    }
+  }
+}
+
+export const mockPressureService = new MockPressureService();
diff --git a/test/wpt/tests/resources/chromium/mock-pressure-service.js.headers b/test/wpt/tests/resources/chromium/mock-pressure-service.js.headers
new file mode 100644
index 00000000000..6805c323df5
--- /dev/null
+++ b/test/wpt/tests/resources/chromium/mock-pressure-service.js.headers
@@ -0,0 +1 @@
+Content-Type: text/javascript; charset=utf-8
diff --git a/test/wpt/tests/resources/chromium/mock-subapps.js b/test/wpt/tests/resources/chromium/mock-subapps.js
new file mode 100644
index 00000000000..b63e97b8c4d
--- /dev/null
+++ b/test/wpt/tests/resources/chromium/mock-subapps.js
@@ -0,0 +1,86 @@
+'use strict';
+
+import {SubAppsService, SubAppsServiceReceiver, SubAppsServiceResultCode} from '/gen/third_party/blink/public/mojom/subapps/sub_apps_service.mojom.m.js';
+
+self.SubAppsServiceTest = (() => {
+  // Class that mocks SubAppsService interface defined in /third_party/blink/public/mojom/subapps/sub_apps_service.mojom
+
+  class MockSubAppsService {
+    constructor() {
+      this.interceptor_ =
+        new MojoInterfaceInterceptor(SubAppsService.$interfaceName);
+      this.receiver_ = new SubAppsServiceReceiver(this);
+      this.interceptor_.oninterfacerequest =
+        e => this.receiver_.$.bindHandle(e.handle);
+      this.interceptor_.start();
+    }
+
+    reset() {
+      this.interceptor_.stop();
+      this.receiver_.$.close();
+    }
+
+    add(sub_apps) {
+      return Promise.resolve({
+        result: testInternal.addCallReturnValue,
+      });
+    }
+
+    list() {
+      return Promise.resolve({
+        result: {
+          resultCode: testInternal.serviceResultCode,
+          subAppsList: testInternal.listCallReturnValue,
+        }
+      });
+    }
+
+    remove() {
+      return Promise.resolve({
+        result: testInternal.serviceResultCode,
+      });
+    }
+  }
+
+  let testInternal = {
+    initialized: false,
+    mockSubAppsService: null,
+    serviceResultCode: 0,
+    addCallReturnValue: [],
+    listCallReturnValue: [],
+  }
+
+  class SubAppsServiceTestChromium {
+    constructor() {
+      Object.freeze(this);  // Make it immutable.
+    }
+
+    initialize(service_result_code, add_call_return_value, list_call_return_value) {
+      if (!testInternal.initialized) {
+        testInternal = {
+          mockSubAppsService: new MockSubAppsService(),
+          initialized: true,
+          serviceResultCode: service_result_code,
+          addCallReturnValue: add_call_return_value,
+          listCallReturnValue: list_call_return_value,
+        };
+      };
+    }
+
+    async reset() {
+      if (testInternal.initialized) {
+        testInternal.mockSubAppsService.reset();
+        testInternal = {
+          mockSubAppsService: null,
+          initialized: false,
+          serviceResultCode: 0,
+          addCallReturnValue: [],
+          listCallReturnValue: [],
+        };
+        await new Promise(resolve => setTimeout(resolve, 0));
+      }
+    }
+  }
+
+  return SubAppsServiceTestChromium;
+})();
diff --git a/test/wpt/tests/resources/chromium/mock-textdetection.js b/test/wpt/tests/resources/chromium/mock-textdetection.js
new file mode 100644
index 00000000000..52ca987e286
--- /dev/null
+++ b/test/wpt/tests/resources/chromium/mock-textdetection.js
@@ -0,0 +1,92 @@
+import {TextDetection, TextDetectionReceiver} from '/gen/services/shape_detection/public/mojom/textdetection.mojom.m.js';
+
+self.TextDetectionTest = (() => {
+  // Class that mocks TextDetection interface defined in
+  // https://cs.chromium.org/chromium/src/services/shape_detection/public/mojom/textdetection.mojom
+  class MockTextDetection {
+    constructor() {
+      this.receiver_ = new TextDetectionReceiver(this);
+      this.interceptor_ =
+          new MojoInterfaceInterceptor(TextDetection.$interfaceName);
+      this.interceptor_.oninterfacerequest =
+          e => this.receiver_.$.bindHandle(e.handle);
+      this.interceptor_.start();
+    }
+
+    detect(bitmapData) {
+      this.bufferData_ =
+          new Uint32Array(getArrayBufferFromBigBuffer(bitmapData.pixelData));
+      return Promise.resolve({
+        results: [
+          {
+            rawValue : "cats",
+            boundingBox: { x: 1.0, y: 1.0, width: 100.0, height: 100.0 },
+            cornerPoints: [
+              { x: 1.0, y: 1.0 },
+              { x: 101.0, y: 1.0 },
+              { x: 101.0, y: 101.0 },
+              { x: 1.0, y: 101.0 }
+            ]
+          },
+          {
+            rawValue : "dogs",
+            boundingBox: { x: 2.0, y: 2.0, width: 50.0, height: 50.0 },
+            cornerPoints: [
+              { x: 2.0, y: 2.0 },
+              { x: 52.0, y: 2.0 },
+              { x: 52.0, y: 52.0 },
+              { x: 2.0, y: 52.0 }
+            ]
+          },
+        ],
+      });
+    }
+
+    getFrameData() {
+      return this.bufferData_;
+    }
+
+    reset() {
+      this.receiver_.$.close();
+      this.interceptor_.stop();
+    }
+
+  }
+
+  let testInternal = {
+    initialized: false,
+    MockTextDetection: null
+  }
+
+  class TextDetectionTestChromium {
+    constructor() {
+      Object.freeze(this); // Make it immutable.
+    }
+
+    initialize() {
+      if (testInternal.initialized)
+        throw new Error('Call reset() before initialize().');
+
+      testInternal.MockTextDetection = new MockTextDetection;
+      testInternal.initialized = true;
+    }
+
+    // Resets state of text detection mocks between test runs.
+    async reset() {
+      if (!testInternal.initialized)
+        throw new Error('Call initialize() before reset().');
+      testInternal.MockTextDetection.reset();
+      testInternal.MockTextDetection = null;
+      testInternal.initialized = false;
+
+      await new Promise(resolve => setTimeout(resolve, 0));
+    }
+
+    MockTextDetection() {
+      return testInternal.MockTextDetection;
+    }
+  }
+
+  return TextDetectionTestChromium;
+
+})();
diff --git a/test/wpt/tests/resources/chromium/mock-textdetection.js.headers b/test/wpt/tests/resources/chromium/mock-textdetection.js.headers
new file mode 100644
index 00000000000..6c61a34a4ec
--- /dev/null
+++ b/test/wpt/tests/resources/chromium/mock-textdetection.js.headers
@@ -0,0 +1 @@
+Content-Type: text/javascript; charset=utf-8
\ No newline at end of file
diff --git a/test/wpt/tests/resources/chromium/nfc-mock.js b/test/wpt/tests/resources/chromium/nfc-mock.js
new file mode 100644
index 00000000000..31a71b9e220
--- /dev/null
+++ b/test/wpt/tests/resources/chromium/nfc-mock.js
@@ -0,0 +1,437 @@
+import {NDEFErrorType, NDEFRecordTypeCategory, NFC, NFCReceiver} from '/gen/services/device/public/mojom/nfc.mojom.m.js';
+
+// Converts between NDEFMessageInit https://w3c.github.io/web-nfc/#dom-ndefmessage
+// and mojom.NDEFMessage structure, so that watch function can be tested.
+function toMojoNDEFMessage(message) {
+  let ndefMessage = {data: []};
+  for (let record of message.records) {
+    ndefMessage.data.push(toMojoNDEFRecord(record));
+  }
+  return ndefMessage;
+}
+
+function toMojoNDEFRecord(record) {
+  let nfcRecord = {};
+  // Simply checks the existence of ':' to decide whether it's an external
+  // type or a local type. As a mock, no need to really implement the validation
+  // algorithms for them.
+  if (record.recordType.startsWith(':')) {
+    nfcRecord.category = NDEFRecordTypeCategory.kLocal;
+  } else if (record.recordType.search(':') != -1) {
+    nfcRecord.category = NDEFRecordTypeCategory.kExternal;
+  } else {
+    nfcRecord.category = NDEFRecordTypeCategory.kStandardized;
+  }
+  nfcRecord.recordType = record.recordType;
+  nfcRecord.mediaType = record.mediaType;
+  nfcRecord.id = record.id;
+  if (record.recordType == 'text') {
+    nfcRecord.encoding = record.encoding == null? 'utf-8': record.encoding;
+    nfcRecord.lang = record.lang == null? 'en': record.lang;
+  }
+  nfcRecord.data = toByteArray(record.data);
+  if (record.data != null && record.data.records !== undefined) {
+    // |record.data| may be an NDEFMessageInit, i.e. the payload is a message.
+    nfcRecord.payloadMessage = toMojoNDEFMessage(record.data);
+  }
+  return nfcRecord;
+}
+
+// Converts JS objects to byte array.
+function toByteArray(data) {
+  if (data instanceof ArrayBuffer)
+    return new Uint8Array(data);
+  else if (ArrayBuffer.isView(data))
+    return new Uint8Array(data.buffer, data.byteOffset, data.byteLength);
+
+  let byteArray = new Uint8Array(0);
+  let tmpData = data;
+  if (typeof tmpData === 'object' || typeof tmpData === 'number')
+    tmpData = JSON.stringify(tmpData);
+
+  if (typeof tmpData === 'string')
+    byteArray = new TextEncoder().encode(tmpData);
+
+  return byteArray;
+}
+
+// Compares NDEFRecords that were provided / received by the mock service.
+// TODO: Use different getters to get received record data,
+// see spec changes at https://github.com/w3c/web-nfc/pull/243.
+self.compareNDEFRecords = function(providedRecord, receivedRecord) {
+  assert_equals(providedRecord.recordType, receivedRecord.recordType);
+
+  if (providedRecord.id === undefined) {
+    assert_equals(null, receivedRecord.id);
+  } else {
+    assert_equals(providedRecord.id, receivedRecord.id);
+  }
+
+  if (providedRecord.mediaType === undefined) {
+    assert_equals(null, receivedRecord.mediaType);
+  } else {
+    assert_equals(providedRecord.mediaType, receivedRecord.mediaType);
+  }
+
+  assert_not_equals(providedRecord.recordType, 'empty');
+
+  if (providedRecord.recordType == 'text') {
+    assert_equals(
+        providedRecord.encoding == null? 'utf-8': providedRecord.encoding,
+        receivedRecord.encoding);
+    assert_equals(providedRecord.lang == null? 'en': providedRecord.lang,
+                  receivedRecord.lang);
+  } else {
+    assert_equals(null, receivedRecord.encoding);
+    assert_equals(null, receivedRecord.lang);
+  }
+
+  assert_array_equals(toByteArray(providedRecord.data),
+                      new Uint8Array(receivedRecord.data));
+}
+
+// Compares NDEFWriteOptions structures that were provided to API and
+// received by the mock mojo service.
+self.assertNDEFWriteOptionsEqual = function(provided, received) {
+  if (provided.overwrite !== undefined)
+    assert_equals(provided.overwrite, !!received.overwrite);
+  else
+    assert_equals(!!received.overwrite, true);
+}
+
+// Compares NDEFReaderOptions structures that were provided to API and
+// received by the mock mojo service.
+self.assertNDEFReaderOptionsEqual = function(provided, received) {
+  if (provided.url !== undefined)
+    assert_equals(provided.url, received.url);
+  else
+    assert_equals(received.url, '');
+
+  if (provided.mediaType !== undefined)
+    assert_equals(provided.mediaType, received.mediaType);
+  else
+    assert_equals(received.mediaType, '');
+
+  if (provided.recordType !== undefined) {
+    assert_equals(provided.recordType, received.recordType);
+  }
+}
+
+function createNDEFError(type) {
+  return {error: (type != null ? {errorType: type, errorMessage: ''} : null)};
+}
+
+self.WebNFCTest = (() => {
+  class MockNFC {
+    constructor() {
+      this.receiver_ = new NFCReceiver(this);
+
+      this.interceptor_ = new MojoInterfaceInterceptor(NFC.$interfaceName);
+      this.interceptor_.oninterfacerequest = e => {
+        if (this.should_close_pipe_on_request_)
+          e.handle.close();
+        else
+          this.receiver_.$.bindHandle(e.handle);
+      }
+
+      this.interceptor_.start();
+
+      this.hw_status_ = NFCHWStatus.ENABLED;
+      this.pushed_message_ = null;
+      this.pending_write_options_ = null;
+      this.pending_push_promise_func_ = null;
+      this.push_completed_ = true;
+      this.pending_make_read_only_promise_func_ = null;
+      this.make_read_only_completed_ = true;
+      this.client_ = null;
+      this.watchers_ = [];
+      this.reading_messages_ = [];
+      this.operations_suspended_ = false;
+      this.is_formatted_tag_ = false;
+      this.data_transfer_failed_ = false;
+      this.should_close_pipe_on_request_ = false;
+    }
+
+    // NFC delegate functions.
+    async push(message, options) {
+      const error = this.getHWError();
+      if (error)
+        return error;
+      // Cancels previous pending push operation.
+      if (this.pending_push_promise_func_) {
+        this.cancelPendingPushOperation();
+      }
+
+      this.pushed_message_ = message;
+      this.pending_write_options_ = options;
+      return new Promise(resolve => {
+        if (this.operations_suspended_ || !this.push_completed_) {
+          // Leaves the push pending.
+          this.pending_push_promise_func_ = resolve;
+        } else if (this.is_formatted_tag_ && !options.overwrite) {
+          // Resolves with NotAllowedError if there are NDEF records on the device
+          // and overwrite is false.
+          resolve(createNDEFError(NDEFErrorType.NOT_ALLOWED));
+        } else if (this.data_transfer_failed_) {
+          // Resolves with NetworkError if data transfer fails.
+          resolve(createNDEFError(NDEFErrorType.IO_ERROR));
+        } else {
+          resolve(createNDEFError(null));
+        }
+      });
+    }
+
+    async cancelPush() {
+      this.cancelPendingPushOperation();
+      return createNDEFError(null);
+    }
+
+    async makeReadOnly(options) {
+      const error = this.getHWError();
+      if (error)
+        return error;
+      // Cancels previous pending makeReadOnly operation.
+      if (this.pending_make_read_only_promise_func_) {
+        this.cancelPendingMakeReadOnlyOperation();
+      }
+
+      if (this.operations_suspended_ || !this.make_read_only_completed_) {
+        // Leaves the makeReadOnly pending.
+        return new Promise(resolve => {
+          this.pending_make_read_only_promise_func_ = resolve;
+        });
+      } else if (this.data_transfer_failed_) {
+        // Resolves with NetworkError if data transfer fails.
+        return createNDEFError(NDEFErrorType.IO_ERROR);
+      } else {
+        return createNDEFError(null);
+      }
+    }
+
+    async cancelMakeReadOnly() {
+      this.cancelPendingMakeReadOnlyOperation();
+      return createNDEFError(null);
+    }
+
+    setClient(client) {
+      this.client_ = client;
+    }
+
+    async watch(id) {
+      assert_true(id > 0);
+      const error = this.getHWError();
+      if (error) {
+        return error;
+      }
+
+      this.watchers_.push({id: id});
+      // Ignores reading if NFC operation is suspended
+      // or the NFC tag does not expose NDEF technology.
+      if (!this.operations_suspended_) {
+        // Triggers onWatch if the new watcher matches existing messages.
+        for (let message of this.reading_messages_) {
+          this.client_.onWatch(
+              [id], fake_tag_serial_number, toMojoNDEFMessage(message));
+        }
+      }
+
+      return createNDEFError(null);
+    }
+
+    cancelWatch(id) {
+      let index = this.watchers_.findIndex(value => value.id === id);
+      if (index !== -1) {
+        this.watchers_.splice(index, 1);
+      }
+    }
+
+    getHWError() {
+      if (this.hw_status_ === NFCHWStatus.DISABLED)
+        return createNDEFError(NDEFErrorType.NOT_READABLE);
+      if (this.hw_status_ === NFCHWStatus.NOT_SUPPORTED)
+        return createNDEFError(NDEFErrorType.NOT_SUPPORTED);
+      return null;
+    }
+
+    setHWStatus(status) {
+      this.hw_status_ = status;
+    }
+
+    pushedMessage() {
+      return this.pushed_message_;
+    }
+
+    writeOptions() {
+      return this.pending_write_options_;
+    }
+
+    watchOptions() {
+      assert_not_equals(this.watchers_.length, 0);
+      return this.watchers_[this.watchers_.length - 1].options;
+    }
+
+    setPendingPushCompleted(result) {
+      this.push_completed_ = result;
+    }
+
+    setPendingMakeReadOnlyCompleted(result) {
+      this.make_read_only_completed_ = result;
+    }
+
+    reset() {
+      this.hw_status_ = NFCHWStatus.ENABLED;
+      this.watchers_ = [];
+      this.reading_messages_ = [];
+      this.operations_suspended_ = false;
+      this.cancelPendingPushOperation();
+      this.cancelPendingMakeReadOnlyOperation();
+      this.is_formatted_tag_ = false;
+      this.data_transfer_failed_ = false;
+      this.should_close_pipe_on_request_ = false;
+    }
+
+    cancelPendingPushOperation() {
+      if (this.pending_push_promise_func_) {
+        this.pending_push_promise_func_(
+            createNDEFError(NDEFErrorType.OPERATION_CANCELLED));
+        this.pending_push_promise_func_ = null;
+      }
+
+      this.pushed_message_ = null;
+      this.pending_write_options_ = null;
+      this.push_completed_ = true;
+    }
+
+    cancelPendingMakeReadOnlyOperation() {
+      if (this.pending_make_read_only_promise_func_) {
+        this.pending_make_read_only_promise_func_(
+            createNDEFError(NDEFErrorType.OPERATION_CANCELLED));
+        this.pending_make_read_only_promise_func_ = null;
+      }
+
+      this.make_read_only_completed_ = true;
+    }
+
+    // Sets message that is used to deliver NFC reading updates.
+    setReadingMessage(message) {
+      this.reading_messages_.push(message);
+      // Ignores reading if NFC operation is suspended.
+      if(this.operations_suspended_) return;
+      // when overwrite is false, the write algorithm will read the NFC tag
+      // to determine if it has NDEF records on it.
+      if (this.pending_write_options_ && this.pending_write_options_.overwrite)
+        return;
+      // Triggers onWatch if the new message matches existing watchers.
+      for (let watcher of this.watchers_) {
+        this.client_.onWatch(
+            [watcher.id], fake_tag_serial_number,
+            toMojoNDEFMessage(message));
+      }
+    }
+
+    // Suspends all pending NFC operations. Could be used when web page
+    // visibility is lost.
+    suspendNFCOperations() {
+      this.operations_suspended_ = true;
+    }
+
+    // Resumes all suspended NFC operations.
+    resumeNFCOperations() {
+      this.operations_suspended_ = false;
+      // Resumes pending NFC reading.
+      for (let watcher of this.watchers_) {
+        for (let message of this.reading_messages_) {
+          this.client_.onWatch(
+              [watcher.id], fake_tag_serial_number,
+              toMojoNDEFMessage(message));
+        }
+      }
+      // Resumes pending push operation.
+      if (this.pending_push_promise_func_ && this.push_completed_) {
+        this.pending_push_promise_func_(createNDEFError(null));
+        this.pending_push_promise_func_ = null;
+      }
+      // Resumes pending makeReadOnly operation.
+      if (this.pending_make_read_only_promise_func_ &&
+          this.make_read_only_completed_) {
+        this.pending_make_read_only_promise_func_(createNDEFError(null));
+        this.pending_make_read_only_promise_func_ = null;
+      }
+    }
+
+    // Simulates the device coming in proximity does not expose NDEF technology.
+    simulateNonNDEFTagDiscovered() {
+      // Notify NotSupportedError to all active readers.
+      if (this.watchers_.length != 0) {
+        this.client_.onError({
+          errorType: NDEFErrorType.NOT_SUPPORTED,
+          errorMessage: ''
+        });
+      }
+      // Reject the pending push with NotSupportedError.
+      if (this.pending_push_promise_func_) {
+        this.pending_push_promise_func_(
+            createNDEFError(NDEFErrorType.NOT_SUPPORTED));
+        this.pending_push_promise_func_ = null;
+      }
+      // Reject the pending makeReadOnly with NotSupportedError.
+      if (this.pending_make_read_only_promise_func_) {
+        this.pending_make_read_only_promise_func_(
+            createNDEFError(NDEFErrorType.NOT_SUPPORTED));
+        this.pending_make_read_only_promise_func_ = null;
+      }
+    }
+
+    setIsFormattedTag(isFormatted) {
+      this.is_formatted_tag_ = isFormatted;
+    }
+
+    simulateDataTransferFails() {
+      this.data_transfer_failed_ = true;
+    }
+
+    simulateClosedPipe() {
+      this.should_close_pipe_on_request_ = true;
+    }
+  }
+
+  let testInternal = {
+    initialized: false,
+    mockNFC: null
+  }
+
+  class NFCTestChromium {
+    constructor() {
+      Object.freeze(this); // Makes it immutable.
+    }
+
+    async initialize() {
+      if (testInternal.initialized)
+        throw new Error('Call reset() before initialize().');
+
+      // Grant nfc permissions for Chromium testdriver.
+      await test_driver.set_permission({ name: 'nfc' }, 'granted');
+
+      if (testInternal.mockNFC == null) {
+        testInternal.mockNFC = new MockNFC();
+      }
+      testInternal.initialized = true;
+    }
+
+    // Reuses the nfc mock but resets its state between test runs.
+    async reset() {
+      if (!testInternal.initialized)
+        throw new Error('Call initialize() before reset().');
+      testInternal.mockNFC.reset();
+      testInternal.initialized = false;
+
+      await new Promise(resolve => setTimeout(resolve, 0));
+    }
+
+    getMockNFC() {
+      return testInternal.mockNFC;
+    }
+  }
+
+  return NFCTestChromium;
+})();
diff --git a/test/wpt/tests/resources/chromium/web-bluetooth-test.js b/test/wpt/tests/resources/chromium/web-bluetooth-test.js
new file mode 100644
index 00000000000..ecea5e760c6
--- /dev/null
+++ b/test/wpt/tests/resources/chromium/web-bluetooth-test.js
@@ -0,0 +1,629 @@
+'use strict';
+
+const content = {};
+const bluetooth = {};
+const MOJO_CHOOSER_EVENT_TYPE_MAP = {};
+
+function toMojoCentralState(state) {
+  switch (state) {
+    case 'absent':
+      return bluetooth.mojom.CentralState.ABSENT;
+    case 'powered-off':
+      return bluetooth.mojom.CentralState.POWERED_OFF;
+    case 'powered-on':
+      return bluetooth.mojom.CentralState.POWERED_ON;
+    default:
+      throw `Unsupported value ${state} for state.`;
+  }
+}
+
+// Converts bluetooth.mojom.WriteType to a string. If |writeType| is
+// invalid, this method will throw.
+function writeTypeToString(writeType) {
+  switch (writeType) {
+    case bluetooth.mojom.WriteType.kNone:
+      return 'none';
+    case bluetooth.mojom.WriteType.kWriteDefaultDeprecated:
+      return 'default-deprecated';
+    case bluetooth.mojom.WriteType.kWriteWithResponse:
+      return 'with-response';
+    case bluetooth.mojom.WriteType.kWriteWithoutResponse:
+      return 'without-response';
+    default:
+      throw `Unknown bluetooth.mojom.WriteType: ${writeType}`;
+  }
+}
+
+// Canonicalizes UUIDs and converts them to Mojo UUIDs.
+function canonicalizeAndConvertToMojoUUID(uuids) {
+  let canonicalUUIDs = uuids.map(val => ({uuid: BluetoothUUID.getService(val)}));
+  return canonicalUUIDs;
+}
+
+// Converts WebIDL a record<DOMString, BufferSource> to a map<K, array<uint8>> to
+// use for Mojo, where the value for K is calculated using keyFn.
+function convertToMojoMap(record, keyFn, isNumberKey = false) {
+  let map = new Map();
+  for (const [key, value] of Object.entries(record)) {
+    let buffer = ArrayBuffer.isView(value) ? value.buffer : value;
+    if (isNumberKey) {
+      let numberKey = parseInt(key);
+      if (Number.isNaN(numberKey))
+        throw `Map key ${key} is not a number`;
+      map.set(keyFn(numberKey), Array.from(new Uint8Array(buffer)));
+      continue;
+    }
+    map.set(keyFn(key), Array.from(new Uint8Array(buffer)));
+  }
+  return map;
+}
+
+function ArrayToMojoCharacteristicProperties(arr) {
+  const struct = {};
+  arr.forEach(property => { struct[property] = true; });
+  return struct;
+}
+
+class FakeBluetooth {
+  constructor() {
+    this.fake_bluetooth_ptr_ = new bluetooth.mojom.FakeBluetoothRemote();
+    this.fake_bluetooth_ptr_.$.bindNewPipeAndPassReceiver().bindInBrowser('process');
+    this.fake_central_ = null;
+  }
+
+  // Set it to indicate whether the platform supports BLE. For example,
+  // Windows 7 is a platform that doesn't support Low Energy. On the other
+  // hand Windows 10 is a platform that does support LE, even if there is no
+  // Bluetooth radio present.
+  async setLESupported(supported) {
+    if (typeof supported !== 'boolean') throw 'Type Not Supported';
+    await this.fake_bluetooth_ptr_.setLESupported(supported);
+  }
+
+  // Returns a promise that resolves with a FakeCentral that clients can use
+  // to simulate events that a device in the Central/Observer role would
+  // receive as well as monitor the operations performed by the device in the
+  // Central/Observer role.
+  // Calls sets LE as supported.
+  //
+  // A "Central" object would allow its clients to receive advertising events
+  // and initiate connections to peripherals i.e. operations of two roles
+  // defined by the Bluetooth Spec: Observer and Central.
+  // See Bluetooth 4.2 Vol 3 Part C 2.2.2 "Roles when Operating over an
+  // LE Physical Transport".
+  async simulateCentral({state}) {
+    if (this.fake_central_)
+      throw 'simulateCentral() should only be called once';
+
+    await this.setLESupported(true);
+
+    let {fakeCentral: fake_central_ptr} =
+      await this.fake_bluetooth_ptr_.simulateCentral(
+        toMojoCentralState(state));
+    this.fake_central_ = new FakeCentral(fake_central_ptr);
+    return this.fake_central_;
+  }
+
+  // Returns true if there are no pending responses.
+  async allResponsesConsumed() {
+    let {consumed} = await this.fake_bluetooth_ptr_.allResponsesConsumed();
+    return consumed;
+  }
+
+  // Returns a promise that resolves with a FakeChooser that clients can use to
+  // simulate chooser events.
+  async getManualChooser() {
+    if (typeof this.fake_chooser_ === 'undefined') {
+      this.fake_chooser_ = new FakeChooser();
+    }
+    return this.fake_chooser_;
+  }
+}
+
+// FakeCentral allows clients to simulate events that a device in the
+// Central/Observer role would receive as well as monitor the operations
+// performed by the device in the Central/Observer role.
+class FakeCentral {
+  constructor(fake_central_ptr) {
+    this.fake_central_ptr_ = fake_central_ptr;
+    this.peripherals_ = new Map();
+  }
+
+  // Simulates a peripheral with |address|, |name|, |manufacturerData| and
+  // |known_service_uuids| that has already been connected to the system. If the
+  // peripheral existed already it updates its name, manufacturer data, and
+  // known UUIDs. |known_service_uuids| should be an array of
+  // BluetoothServiceUUIDs
+  // https://webbluetoothcg.github.io/web-bluetooth/#typedefdef-bluetoothserviceuuid
+  //
+  // Platforms offer methods to retrieve devices that have already been
+  // connected to the system or weren't connected through the UA e.g. a user
+  // connected a peripheral through the system's settings. This method is
+  // intended to simulate peripherals that those methods would return.
+  async simulatePreconnectedPeripheral(
+      {address, name, manufacturerData = {}, knownServiceUUIDs = []}) {
+    await this.fake_central_ptr_.simulatePreconnectedPeripheral(
+        address, name,
+        convertToMojoMap(manufacturerData, Number, true /* isNumberKey */),
+        canonicalizeAndConvertToMojoUUID(knownServiceUUIDs));
+
+    return this.fetchOrCreatePeripheral_(address);
+  }
+
+  // Simulates an advertisement packet described by |scanResult| being received
+  // from a device. If central is currently scanning, the device will appear on
+  // the list of discovered devices.
+  async simulateAdvertisementReceived(scanResult) {
+    // Create a deep-copy to prevent the original |scanResult| from being
+    // modified when the UUIDs, manufacturer, and service data are converted.
+    let clonedScanResult = JSON.parse(JSON.stringify(scanResult));
+
+    if ('uuids' in scanResult.scanRecord) {
+      clonedScanResult.scanRecord.uuids =
+          canonicalizeAndConvertToMojoUUID(scanResult.scanRecord.uuids);
+    }
+
+    // Convert the optional appearance and txPower fields to the corresponding
+    // Mojo structures, since Mojo does not support optional interger values. If
+    // the fields are undefined, set the hasValue field as false and value as 0.
+    // Otherwise, set the hasValue field as true and value with the field value.
+    const has_appearance = 'appearance' in scanResult.scanRecord;
+    clonedScanResult.scanRecord.appearance = {
+      hasValue: has_appearance,
+      value: (has_appearance ? scanResult.scanRecord.appearance : 0)
+    }
+
+    const has_tx_power = 'txPower' in scanResult.scanRecord;
+    clonedScanResult.scanRecord.txPower = {
+      hasValue: has_tx_power,
+      value: (has_tx_power ? scanResult.scanRecord.txPower : 0)
+    }
+
+    // Convert manufacturerData from a record<DOMString, BufferSource> into a
+    // map<uint8, array<uint8>> for Mojo.
+    if ('manufacturerData' in scanResult.scanRecord) {
+      clonedScanResult.scanRecord.manufacturerData = convertToMojoMap(
+          scanResult.scanRecord.manufacturerData, Number,
+          true /* isNumberKey */);
+    }
+
+    // Convert serviceData from a record<DOMString, BufferSource> into a
+    // map<string, array<uint8>> for Mojo.
+    if ('serviceData' in scanResult.scanRecord) {
+      clonedScanResult.scanRecord.serviceData.serviceData = convertToMojoMap(
+          scanResult.scanRecord.serviceData, BluetoothUUID.getService,
+          false /* isNumberKey */);
+    }
+
+    await this.fake_central_ptr_.simulateAdvertisementReceived(
+        clonedScanResult);
+
+    return this.fetchOrCreatePeripheral_(clonedScanResult.deviceAddress);
+  }
+
+  // Simulates a change in the central device described by |state|. For example,
+  // setState('powered-off') can be used to simulate the central device powering
+  // off.
+  //
+  // This method should be used for any central state changes after
+  // simulateCentral() has been called to create a FakeCentral object.
+  async setState(state) {
+    await this.fake_central_ptr_.setState(toMojoCentralState(state));
+  }
+
+  // Create a fake_peripheral object from the given address.
+  fetchOrCreatePeripheral_(address) {
+    let peripheral = this.peripherals_.get(address);
+    if (peripheral === undefined) {
+      peripheral = new FakePeripheral(address, this.fake_central_ptr_);
+      this.peripherals_.set(address, peripheral);
+    }
+    return peripheral;
+  }
+}
+
+class FakePeripheral {
+  constructor(address, fake_central_ptr) {
+    this.address = address;
+    this.fake_central_ptr_ = fake_central_ptr;
+  }
+
+  // Adds a fake GATT Service with |uuid| to be discovered when discovering
+  // the peripheral's GATT Attributes. Returns a FakeRemoteGATTService
+  // corresponding to this service. |uuid| should be a BluetoothServiceUUIDs
+  // https://webbluetoothcg.github.io/web-bluetooth/#typedefdef-bluetoothserviceuuid
+  async addFakeService({uuid}) {
+    let {serviceId: service_id} = await this.fake_central_ptr_.addFakeService(
+      this.address, {uuid: BluetoothUUID.getService(uuid)});
+
+    if (service_id === null) throw 'addFakeService failed';
+
+    return new FakeRemoteGATTService(
+      service_id, this.address, this.fake_central_ptr_);
+  }
+
+  // Sets the next GATT Connection request response to |code|. |code| could be
+  // an HCI Error Code from BT 4.2 Vol 2 Part D 1.3 List Of Error Codes or a
+  // number outside that range returned by specific platforms e.g. Android
+  // returns 0x101 to signal a GATT failure
+  // https://developer.android.com/reference/android/bluetooth/BluetoothGatt.html#GATT_FAILURE
+  async setNextGATTConnectionResponse({code}) {
+    let {success} =
+      await this.fake_central_ptr_.setNextGATTConnectionResponse(
+        this.address, code);
+
+    if (success !== true) throw 'setNextGATTConnectionResponse failed.';
+  }
+
+  // Sets the next GATT Discovery request response for peripheral with
+  // |address| to |code|. |code| could be an HCI Error Code from
+  // BT 4.2 Vol 2 Part D 1.3 List Of Error Codes or a number outside that
+  // range returned by specific platforms e.g. Android returns 0x101 to signal
+  // a GATT failure
+  // https://developer.android.com/reference/android/bluetooth/BluetoothGatt.html#GATT_FAILURE
+  //
+  // The following procedures defined at BT 4.2 Vol 3 Part G Section 4.
+  // "GATT Feature Requirements" are used to discover attributes of the
+  // GATT Server:
+  //  - Primary Service Discovery
+  //  - Relationship Discovery
+  //  - Characteristic Discovery
+  //  - Characteristic Descriptor Discovery
+  // This method aims to simulate the response once all of these procedures
+  // have completed or if there was an error during any of them.
+  async setNextGATTDiscoveryResponse({code}) {
+    let {success} =
+      await this.fake_central_ptr_.setNextGATTDiscoveryResponse(
+        this.address, code);
+
+    if (success !== true) throw 'setNextGATTDiscoveryResponse failed.';
+  }
+
+  // Simulates a GATT disconnection from the peripheral with |address|.
+  async simulateGATTDisconnection() {
+    let {success} =
+      await this.fake_central_ptr_.simulateGATTDisconnection(this.address);
+
+    if (success !== true) throw 'simulateGATTDisconnection failed.';
+  }
+
+  // Simulates an Indication from the peripheral's GATT `Service Changed`
+  // Characteristic from BT 4.2 Vol 3 Part G 7.1. This Indication is signaled
+  // when services, characteristics, or descriptors are changed, added, or
+  // removed.
+  //
+  // The value for `Service Changed` is a range of attribute handles that have
+  // changed. However, this testing specification works at an abstracted
+  // level and does not expose setting attribute handles when adding
+  // attributes. Consequently, this simulate method should include the full
+  // range of all the peripheral's attribute handle values.
+  async simulateGATTServicesChanged() {
+    let {success} =
+      await this.fake_central_ptr_.simulateGATTServicesChanged(this.address);
+
+    if (success !== true) throw 'simulateGATTServicesChanged failed.';
+  }
+}
+
+class FakeRemoteGATTService {
+  constructor(service_id, peripheral_address, fake_central_ptr) {
+    this.service_id_ = service_id;
+    this.peripheral_address_ = peripheral_address;
+    this.fake_central_ptr_ = fake_central_ptr;
+  }
+
+  // Adds a fake GATT Characteristic with |uuid| and |properties|
+  // to this fake service. The characteristic will be found when discovering
+  // the peripheral's GATT Attributes. Returns a FakeRemoteGATTCharacteristic
+  // corresponding to the added characteristic.
+  async addFakeCharacteristic({uuid, properties}) {
+    let {characteristicId: characteristic_id} =
+        await this.fake_central_ptr_.addFakeCharacteristic(
+            {uuid: BluetoothUUID.getCharacteristic(uuid)},
+            ArrayToMojoCharacteristicProperties(properties),
+            this.service_id_,
+            this.peripheral_address_);
+
+    if (characteristic_id === null) throw 'addFakeCharacteristic failed';
+
+    return new FakeRemoteGATTCharacteristic(
+      characteristic_id, this.service_id_,
+      this.peripheral_address_, this.fake_central_ptr_);
+  }
+
+  // Removes the fake GATT service from its fake peripheral.
+  async remove() {
+    let {success} =
+        await this.fake_central_ptr_.removeFakeService(
+            this.service_id_,
+            this.peripheral_address_);
+
+    if (!success) throw 'remove failed';
+  }
+}
+
+class FakeRemoteGATTCharacteristic {
+  constructor(characteristic_id, service_id, peripheral_address,
+      fake_central_ptr) {
+    this.ids_ = [characteristic_id, service_id, peripheral_address];
+    this.descriptors_ = [];
+    this.fake_central_ptr_ = fake_central_ptr;
+  }
+
+  // Adds a fake GATT Descriptor with |uuid| to be discovered when
+  // discovering the peripheral's GATT Attributes. Returns a
+  // FakeRemoteGATTDescriptor corresponding to this descriptor. |uuid| should
+  // be a BluetoothDescriptorUUID
+  // https://webbluetoothcg.github.io/web-bluetooth/#typedefdef-bluetoothdescriptoruuid
+  async addFakeDescriptor({uuid}) {
+    let {descriptorId: descriptor_id} =
+        await this.fake_central_ptr_.addFakeDescriptor(
+            {uuid: BluetoothUUID.getDescriptor(uuid)}, ...this.ids_);
+
+    if (descriptor_id === null) throw 'addFakeDescriptor failed';
+
+    let fake_descriptor = new FakeRemoteGATTDescriptor(
+      descriptor_id, ...this.ids_, this.fake_central_ptr_);
+    this.descriptors_.push(fake_descriptor);
+
+    return fake_descriptor;
+  }
+
+  // Sets the next read response for characteristic to |code| and |value|.
+  // |code| could be a GATT Error Response from
+  // BT 4.2 Vol 3 Part F 3.4.1.1 Error Response or a number outside that range
+  // returned by specific platforms e.g. Android returns 0x101 to signal a GATT
+  // failure.
+  // https://developer.android.com/reference/android/bluetooth/BluetoothGatt.html#GATT_FAILURE
+  async setNextReadResponse(gatt_code, value=null) {
+    if (gatt_code === 0 && value === null) {
+      throw '|value| can\'t be null if read should success.';
+    }
+    if (gatt_code !== 0 && value !== null) {
+      throw '|value| must be null if read should fail.';
+    }
+
+    let {success} =
+      await this.fake_central_ptr_.setNextReadCharacteristicResponse(
+        gatt_code, value, ...this.ids_);
+
+    if (!success) throw 'setNextReadCharacteristicResponse failed';
+  }
+
+  // Sets the next write response for this characteristic to |code|. If
+  // writing to a characteristic that only supports 'write_without_response'
+  // the set response will be ignored.
+  // |code| could be a GATT Error Response from
+  // BT 4.2 Vol 3 Part F 3.4.1.1 Error Response or a number outside that range
+  // returned by specific platforms e.g. Android returns 0x101 to signal a GATT
+  // failure.
+  async setNextWriteResponse(gatt_code) {
+    let {success} =
+      await this.fake_central_ptr_.setNextWriteCharacteristicResponse(
+        gatt_code, ...this.ids_);
+
+    if (!success) throw 'setNextWriteCharacteristicResponse failed';
+  }
+
+  // Sets the next subscribe to notifications response for characteristic with
+  // |characteristic_id| in |service_id| and in |peripheral_address| to
+  // |code|. |code| could be a GATT Error Response from BT 4.2 Vol 3 Part F
+  // 3.4.1.1 Error Response or a number outside that range returned by
+  // specific platforms e.g. Android returns 0x101 to signal a GATT failure.
+  async setNextSubscribeToNotificationsResponse(gatt_code) {
+    let {success} =
+      await this.fake_central_ptr_.setNextSubscribeToNotificationsResponse(
+        gatt_code, ...this.ids_);
+
+    if (!success) throw 'setNextSubscribeToNotificationsResponse failed';
+  }
+
+  // Sets the next unsubscribe to notifications response for characteristic with
+  // |characteristic_id| in |service_id| and in |peripheral_address| to
+  // |code|. |code| could be a GATT Error Response from BT 4.2 Vol 3 Part F
+  // 3.4.1.1 Error Response or a number outside that range returned by
+  // specific platforms e.g. Android returns 0x101 to signal a GATT failure.
+  async setNextUnsubscribeFromNotificationsResponse(gatt_code) {
+    let {success} =
+      await this.fake_central_ptr_.setNextUnsubscribeFromNotificationsResponse(
+        gatt_code, ...this.ids_);
+
+    if (!success) throw 'setNextUnsubscribeToNotificationsResponse failed';
+  }
+
+  // Returns true if notifications from the characteristic have been subscribed
+  // to.
+  async isNotifying() {
+    let {success, isNotifying} =
+        await this.fake_central_ptr_.isNotifying(...this.ids_);
+
+    if (!success) throw 'isNotifying failed';
+
+    return isNotifying;
+  }
+
+  // Gets the last successfully written value to the characteristic and its
+  // write type. Write type is one of 'none', 'default-deprecated',
+  // 'with-response', 'without-response'. Returns {lastValue: null,
+  // lastWriteType: 'none'} if no value has yet been written to the
+  // characteristic.
+  async getLastWrittenValue() {
+    let {success, value, writeType} =
+        await this.fake_central_ptr_.getLastWrittenCharacteristicValue(
+            ...this.ids_);
+
+    if (!success) throw 'getLastWrittenCharacteristicValue failed';
+
+    return {lastValue: value, lastWriteType: writeTypeToString(writeType)};
+  }
+
+  // Removes the fake GATT Characteristic from its fake service.
+  async remove() {
+    let {success} =
+        await this.fake_central_ptr_.removeFakeCharacteristic(...this.ids_);
+
+    if (!success) throw 'remove failed';
+  }
+}
+
+class FakeRemoteGATTDescriptor {
+  constructor(descriptor_id,
+              characteristic_id,
+              service_id,
+              peripheral_address,
+              fake_central_ptr) {
+    this.ids_ = [
+      descriptor_id, characteristic_id, service_id, peripheral_address];
+    this.fake_central_ptr_ = fake_central_ptr;
+  }
+
+  // Sets the next read response for descriptor to |code| and |value|.
+  // |code| could be a GATT Error Response from
+  // BT 4.2 Vol 3 Part F 3.4.1.1 Error Response or a number outside that range
+  // returned by specific platforms e.g. Android returns 0x101 to signal a GATT
+  // failure.
+  // https://developer.android.com/reference/android/bluetooth/BluetoothGatt.html#GATT_FAILURE
+  async setNextReadResponse(gatt_code, value=null) {
+    if (gatt_code === 0 && value === null) {
+      throw '|value| cannot be null if read should succeed.';
+    }
+    if (gatt_code !== 0 && value !== null) {
+      throw '|value| must be null if read should fail.';
+    }
+
+    let {success} =
+      await this.fake_central_ptr_.setNextReadDescriptorResponse(
+        gatt_code, value, ...this.ids_);
+
+    if (!success) throw 'setNextReadDescriptorResponse failed';
+  }
+
+  // Sets the next write response for this descriptor to |code|.
+  // |code| could be a GATT Error Response from
+  // BT 4.2 Vol 3 Part F 3.4.1.1 Error Response or a number outside that range
+  // returned by specific platforms e.g. Android returns 0x101 to signal a GATT
+  // failure.
+  async setNextWriteResponse(gatt_code) {
+    let {success} =
+      await this.fake_central_ptr_.setNextWriteDescriptorResponse(
+        gatt_code, ...this.ids_);
+
+    if (!success) throw 'setNextWriteDescriptorResponse failed';
+  }
+
+  // Gets the last successfully written value to the descriptor.
+  // Returns null if no value has yet been written to the descriptor.
+  async getLastWrittenValue() {
+    let {success, value} =
+      await this.fake_central_ptr_.getLastWrittenDescriptorValue(
+          ...this.ids_);
+
+    if (!success) throw 'getLastWrittenDescriptorValue failed';
+
+    return value;
+  }
+
+  // Removes the fake GATT Descriptor from its fake characteristic.
+  async remove() {
+    let {success} =
+        await this.fake_central_ptr_.removeFakeDescriptor(...this.ids_);
+
+    if (!success) throw 'remove failed';
+  }
+}
+
+// FakeChooser allows clients to simulate user actions on a Bluetooth chooser,
+// and records the events produced by the Bluetooth chooser.
+class FakeChooser {
+  constructor() {
+    let fakeBluetoothChooserFactoryRemote =
+        new content.mojom.FakeBluetoothChooserFactoryRemote();
+    fakeBluetoothChooserFactoryRemote.$.bindNewPipeAndPassReceiver().bindInBrowser('process');
+
+    this.fake_bluetooth_chooser_ptr_ =
+        new content.mojom.FakeBluetoothChooserRemote();
+    this.fake_bluetooth_chooser_client_receiver_ =
+        new content.mojom.FakeBluetoothChooserClientReceiver(this);
+    fakeBluetoothChooserFactoryRemote.createFakeBluetoothChooser(
+        this.fake_bluetooth_chooser_ptr_.$.bindNewPipeAndPassReceiver(),
+        this.fake_bluetooth_chooser_client_receiver_.$.associateAndPassRemote());
+
+    this.events_ = new Array();
+    this.event_listener_ = null;
+  }
+
+  // If the chooser has received more events than |numOfEvents| this function
+  // will reject the promise, else it will wait until |numOfEvents| events are
+  // received before resolving with an array of |FakeBluetoothChooserEvent|
+  // objects.
+  async waitForEvents(numOfEvents) {
+    return new Promise(resolve => {
+      if (this.events_.length > numOfEvents) {
+        throw `Asked for ${numOfEvents} event(s), but received ` +
+            `${this.events_.length}.`;
+      }
+
+      this.event_listener_ = () => {
+         if (this.events_.length === numOfEvents) {
+          let result = Array.from(this.events_);
+          this.event_listener_ = null;
+          this.events_ = [];
+          resolve(result);
+        }
+      };
+      this.event_listener_();
+    });
+  }
+
+  async selectPeripheral(peripheral) {
+    if (!(peripheral instanceof FakePeripheral)) {
+      throw '|peripheral| must be an instance of FakePeripheral';
+    }
+    await this.fake_bluetooth_chooser_ptr_.selectPeripheral(peripheral.address);
+  }
+
+  async cancel() {
+    await this.fake_bluetooth_chooser_ptr_.cancel();
+  }
+
+  async rescan() {
+    await this.fake_bluetooth_chooser_ptr_.rescan();
+  }
+
+  onEvent(chooserEvent) {
+    chooserEvent.type = MOJO_CHOOSER_EVENT_TYPE_MAP[chooserEvent.type];
+    this.events_.push(chooserEvent);
+    if (this.event_listener_ !== null) {
+      this.event_listener_();
+    }
+  }
+}
+
+async function initializeChromiumResources() {
+  content.mojom = await import(
+      '/gen/content/web_test/common/fake_bluetooth_chooser.mojom.m.js');
+  bluetooth.mojom = await import(
+      '/gen/device/bluetooth/public/mojom/test/fake_bluetooth.mojom.m.js');
+
+  const map = MOJO_CHOOSER_EVENT_TYPE_MAP;
+  const types = content.mojom.ChooserEventType;
+  map[types.CHOOSER_OPENED] = 'chooser-opened';
+  map[types.CHOOSER_CLOSED] = 'chooser-closed';
+  map[types.ADAPTER_REMOVED] = 'adapter-removed';
+  map[types.ADAPTER_DISABLED] = 'adapter-disabled';
+  map[types.ADAPTER_ENABLED] = 'adapter-enabled';
+  map[types.DISCOVERY_FAILED_TO_START] = 'discovery-failed-to-start';
+  map[types.DISCOVERING] = 'discovering';
+  map[types.DISCOVERY_IDLE] = 'discovery-idle';
+  map[types.ADD_OR_UPDATE_DEVICE] = 'add-or-update-device';
+
+  // If this line fails, it means that current environment does not support the
+  // Web Bluetooth Test API.
+  try {
+    navigator.bluetooth.test = new FakeBluetooth();
+  } catch {
+    throw 'Web Bluetooth Test API is not implemented on this ' +
+        'environment. See the bluetooth README at ' +
+        'https://github.com/web-platform-tests/wpt/blob/master/bluetooth/README.md#web-bluetooth-testing';
+  }
+}
diff --git a/test/wpt/tests/resources/chromium/web-bluetooth-test.js.headers b/test/wpt/tests/resources/chromium/web-bluetooth-test.js.headers
new file mode 100644
index 00000000000..6805c323df5
--- /dev/null
+++ b/test/wpt/tests/resources/chromium/web-bluetooth-test.js.headers
@@ -0,0 +1 @@
+Content-Type: text/javascript; charset=utf-8
diff --git a/test/wpt/tests/resources/chromium/webusb-child-test.js b/test/wpt/tests/resources/chromium/webusb-child-test.js
new file mode 100644
index 00000000000..add04fa5825
--- /dev/null
+++ b/test/wpt/tests/resources/chromium/webusb-child-test.js
@@ -0,0 +1,40 @@
+'use strict';
+
+// This polyfill prepares a child context to be attached to a parent context.
+// The parent must call navigator.usb.test.attachToContext() to attach to the
+// child context.
+(() => {
+  if (this.constructor.name === 'DedicatedWorkerGlobalScope' ||
+      this !== window.top) {
+
+    // Run Chromium specific set up code.
+    if (typeof MojoInterfaceInterceptor !== 'undefined') {
+      let messageChannel = new MessageChannel();
+      messageChannel.port1.onmessage = async (messageEvent) => {
+        if (messageEvent.data.type === 'Attach') {
+          messageEvent.data.interfaces.forEach(interfaceName => {
+            let interfaceInterceptor =
+                new MojoInterfaceInterceptor(interfaceName);
+            interfaceInterceptor.oninterfacerequest =
+              e => messageChannel.port1.postMessage({
+                type: interfaceName,
+                handle: e.handle
+              }, [e.handle]);
+            interfaceInterceptor.start();
+          });
+
+          // Wait for a call to GetDevices() to ensure that the interface
+          // handles are forwarded to the parent context.
+          await navigator.usb.getDevices();
+          messageChannel.port1.postMessage({ type: 'Complete' });
+        }
+      };
+
+      let message = { type: 'ReadyForAttachment', port: messageChannel.port2 };
+      if (typeof Window !== 'undefined')
+        parent.postMessage(message, '*', [messageChannel.port2]);
+      else
+        postMessage(message, [messageChannel.port2]);
+    }
+  }
+})();
diff --git a/test/wpt/tests/resources/chromium/webusb-child-test.js.headers b/test/wpt/tests/resources/chromium/webusb-child-test.js.headers
new file mode 100644
index 00000000000..6805c323df5
--- /dev/null
+++ b/test/wpt/tests/resources/chromium/webusb-child-test.js.headers
@@ -0,0 +1 @@
+Content-Type: text/javascript; charset=utf-8
diff --git a/test/wpt/tests/resources/chromium/webusb-test.js b/test/wpt/tests/resources/chromium/webusb-test.js
new file mode 100644
index 00000000000..94ff1bcadd9
--- /dev/null
+++ b/test/wpt/tests/resources/chromium/webusb-test.js
@@ -0,0 +1,582 @@
+'use strict';
+
+// This polyfill library implements the WebUSB Test API as specified here:
+// https://wicg.github.io/webusb/test/
+
+(() => {
+
+// These variables are logically members of the USBTest class but are defined
+// here to hide them from being visible as fields of navigator.usb.test.
+let internal = {
+  intialized: false,
+
+  webUsbService: null,
+  webUsbServiceInterceptor: null,
+
+  messagePort: null,
+};
+
+let mojom = {};
+
+async function loadMojomDefinitions() {
+  const deviceMojom =
+      await import('/gen/services/device/public/mojom/usb_device.mojom.m.js');
+  const serviceMojom = await import(
+      '/gen/third_party/blink/public/mojom/usb/web_usb_service.mojom.m.js');
+  return {
+    ...deviceMojom,
+    ...serviceMojom,
+  };
+}
+
+function getMessagePort(target) {
+  return new Promise(resolve => {
+    target.addEventListener('message', messageEvent => {
+      if (messageEvent.data.type === 'ReadyForAttachment') {
+        if (internal.messagePort === null) {
+          internal.messagePort = messageEvent.data.port;
+        }
+        resolve();
+      }
+    }, {once: true});
+  });
+}
+
+// Converts an ECMAScript String object to an instance of
+// mojo_base.mojom.String16.
+function mojoString16ToString(string16) {
+  return String.fromCharCode.apply(null, string16.data);
+}
+
+// Converts an instance of mojo_base.mojom.String16 to an ECMAScript String.
+function stringToMojoString16(string) {
+  let array = new Array(string.length);
+  for (var i = 0; i < string.length; ++i) {
+    array[i] = string.charCodeAt(i);
+  }
+  return { data: array }
+}
+
+function fakeDeviceInitToDeviceInfo(guid, init) {
+  let deviceInfo = {
+    guid: guid + "",
+    usbVersionMajor: init.usbVersionMajor,
+    usbVersionMinor: init.usbVersionMinor,
+    usbVersionSubminor: init.usbVersionSubminor,
+    classCode: init.deviceClass,
+    subclassCode: init.deviceSubclass,
+    protocolCode: init.deviceProtocol,
+    vendorId: init.vendorId,
+    productId: init.productId,
+    deviceVersionMajor: init.deviceVersionMajor,
+    deviceVersionMinor: init.deviceVersionMinor,
+    deviceVersionSubminor: init.deviceVersionSubminor,
+    manufacturerName: stringToMojoString16(init.manufacturerName),
+    productName: stringToMojoString16(init.productName),
+    serialNumber: stringToMojoString16(init.serialNumber),
+    activeConfiguration: init.activeConfigurationValue,
+    configurations: []
+  };
+  init.configurations.forEach(config => {
+    var configInfo = {
+      configurationValue: config.configurationValue,
+      configurationName: stringToMojoString16(config.configurationName),
+      selfPowered: false,
+      remoteWakeup: false,
+      maximumPower: 0,
+      interfaces: [],
+      extraData: new Uint8Array()
+    };
+    config.interfaces.forEach(iface => {
+      var interfaceInfo = {
+        interfaceNumber: iface.interfaceNumber,
+        alternates: []
+      };
+      iface.alternates.forEach(alternate => {
+        var alternateInfo = {
+          alternateSetting: alternate.alternateSetting,
+          classCode: alternate.interfaceClass,
+          subclassCode: alternate.interfaceSubclass,
+          protocolCode: alternate.interfaceProtocol,
+          interfaceName: stringToMojoString16(alternate.interfaceName),
+          endpoints: [],
+          extraData: new Uint8Array()
+        };
+        alternate.endpoints.forEach(endpoint => {
+          var endpointInfo = {
+            endpointNumber: endpoint.endpointNumber,
+            packetSize: endpoint.packetSize,
+            synchronizationType: mojom.UsbSynchronizationType.NONE,
+            usageType: mojom.UsbUsageType.DATA,
+            pollingInterval: 0,
+            extraData: new Uint8Array()
+          };
+          switch (endpoint.direction) {
+            case "in":
+              endpointInfo.direction = mojom.UsbTransferDirection.INBOUND;
+              break;
+            case "out":
+              endpointInfo.direction = mojom.UsbTransferDirection.OUTBOUND;
+              break;
+          }
+          switch (endpoint.type) {
+            case "bulk":
+              endpointInfo.type = mojom.UsbTransferType.BULK;
+              break;
+            case "interrupt":
+              endpointInfo.type = mojom.UsbTransferType.INTERRUPT;
+              break;
+            case "isochronous":
+              endpointInfo.type = mojom.UsbTransferType.ISOCHRONOUS;
+              break;
+          }
+          alternateInfo.endpoints.push(endpointInfo);
+        });
+        interfaceInfo.alternates.push(alternateInfo);
+      });
+      configInfo.interfaces.push(interfaceInfo);
+    });
+    deviceInfo.configurations.push(configInfo);
+  });
+  return deviceInfo;
+}
+
+function convertMojoDeviceFilters(input) {
+  let output = [];
+  input.forEach(filter => {
+    output.push(convertMojoDeviceFilter(filter));
+  });
+  return output;
+}
+
+function convertMojoDeviceFilter(input) {
+  let output = {};
+  if (input.hasVendorId)
+    output.vendorId = input.vendorId;
+  if (input.hasProductId)
+    output.productId = input.productId;
+  if (input.hasClassCode)
+    output.classCode = input.classCode;
+  if (input.hasSubclassCode)
+    output.subclassCode = input.subclassCode;
+  if (input.hasProtocolCode)
+    output.protocolCode = input.protocolCode;
+  if (input.serialNumber)
+    output.serialNumber = mojoString16ToString(input.serialNumber);
+  return output;
+}
+
+class FakeDevice {
+  constructor(deviceInit) {
+    this.info_ = deviceInit;
+    this.opened_ = false;
+    this.currentConfiguration_ = null;
+    this.claimedInterfaces_ = new Map();
+  }
+
+  getConfiguration() {
+    if (this.currentConfiguration_) {
+      return Promise.resolve({
+          value: this.currentConfiguration_.configurationValue });
+    } else {
+      return Promise.resolve({ value: 0 });
+    }
+  }
+
+  open() {
+    assert_false(this.opened_);
+    this.opened_ = true;
+    return Promise.resolve({result: {success: mojom.UsbOpenDeviceSuccess.OK}});
+  }
+
+  close() {
+    assert_true(this.opened_);
+    this.opened_ = false;
+    return Promise.resolve();
+  }
+
+  setConfiguration(value) {
+    assert_true(this.opened_);
+
+    let selectedConfiguration = this.info_.configurations.find(
+        configuration => configuration.configurationValue == value);
+    // Blink should never request an invalid configuration.
+    assert_not_equals(selectedConfiguration, undefined);
+    this.currentConfiguration_ = selectedConfiguration;
+    return Promise.resolve({ success: true });
+  }
+
+  async claimInterface(interfaceNumber) {
+    assert_true(this.opened_);
+    assert_false(this.currentConfiguration_ == null, 'device configured');
+    assert_false(this.claimedInterfaces_.has(interfaceNumber),
+                 'interface already claimed');
+
+    const protectedInterfaces = new Set([
+      mojom.USB_AUDIO_CLASS,
+      mojom.USB_HID_CLASS,
+      mojom.USB_MASS_STORAGE_CLASS,
+      mojom.USB_SMART_CARD_CLASS,
+      mojom.USB_VIDEO_CLASS,
+      mojom.USB_AUDIO_VIDEO_CLASS,
+      mojom.USB_WIRELESS_CLASS,
+    ]);
+
+    let iface = this.currentConfiguration_.interfaces.find(
+        iface => iface.interfaceNumber == interfaceNumber);
+    // Blink should never request an invalid interface or alternate.
+    assert_false(iface == undefined);
+    if (iface.alternates.some(
+            alt => protectedInterfaces.has(alt.interfaceClass))) {
+      return {result: mojom.UsbClaimInterfaceResult.kProtectedClass};
+    }
+
+    this.claimedInterfaces_.set(interfaceNumber, 0);
+    return {result: mojom.UsbClaimInterfaceResult.kSuccess};
+  }
+
+  releaseInterface(interfaceNumber) {
+    assert_true(this.opened_);
+    assert_false(this.currentConfiguration_ == null, 'device configured');
+    assert_true(this.claimedInterfaces_.has(interfaceNumber));
+    this.claimedInterfaces_.delete(interfaceNumber);
+    return Promise.resolve({ success: true });
+  }
+
+  setInterfaceAlternateSetting(interfaceNumber, alternateSetting) {
+    assert_true(this.opened_);
+    assert_false(this.currentConfiguration_ == null, 'device configured');
+    assert_true(this.claimedInterfaces_.has(interfaceNumber));
+
+    let iface = this.currentConfiguration_.interfaces.find(
+        iface => iface.interfaceNumber == interfaceNumber);
+    // Blink should never request an invalid interface or alternate.
+    assert_false(iface == undefined);
+    assert_true(iface.alternates.some(
+        x => x.alternateSetting == alternateSetting));
+    this.claimedInterfaces_.set(interfaceNumber, alternateSetting);
+    return Promise.resolve({ success: true });
+  }
+
+  reset() {
+    assert_true(this.opened_);
+    return Promise.resolve({ success: true });
+  }
+
+  clearHalt(endpoint) {
+    assert_true(this.opened_);
+    assert_false(this.currentConfiguration_ == null, 'device configured');
+    // TODO(reillyg): Assert that endpoint is valid.
+    return Promise.resolve({ success: true });
+  }
+
+  async controlTransferIn(params, length, timeout) {
+    assert_true(this.opened_);
+
+    if ((params.recipient == mojom.UsbControlTransferRecipient.INTERFACE ||
+         params.recipient == mojom.UsbControlTransferRecipient.ENDPOINT) &&
+        this.currentConfiguration_ == null) {
+      return {
+        status: mojom.UsbTransferStatus.PERMISSION_DENIED,
+      };
+    }
+
+    return {
+      status: mojom.UsbTransferStatus.OK,
+      data: {
+        buffer: [
+          length >> 8, length & 0xff, params.request, params.value >> 8,
+          params.value & 0xff, params.index >> 8, params.index & 0xff
+        ]
+      }
+    };
+  }
+
+  async controlTransferOut(params, data, timeout) {
+    assert_true(this.opened_);
+
+    if ((params.recipient == mojom.UsbControlTransferRecipient.INTERFACE ||
+         params.recipient == mojom.UsbControlTransferRecipient.ENDPOINT) &&
+        this.currentConfiguration_ == null) {
+      return {
+        status: mojom.UsbTransferStatus.PERMISSION_DENIED,
+      };
+    }
+
+    return {status: mojom.UsbTransferStatus.OK, bytesWritten: data.byteLength};
+  }
+
+  genericTransferIn(endpointNumber, length, timeout) {
+    assert_true(this.opened_);
+    assert_false(this.currentConfiguration_ == null, 'device configured');
+    // TODO(reillyg): Assert that endpoint is valid.
+    let data = new Array(length);
+    for (let i = 0; i < length; ++i)
+      data[i] = i & 0xff;
+    return Promise.resolve(
+        {status: mojom.UsbTransferStatus.OK, data: {buffer: data}});
+  }
+
+  genericTransferOut(endpointNumber, data, timeout) {
+    assert_true(this.opened_);
+    assert_false(this.currentConfiguration_ == null, 'device configured');
+    // TODO(reillyg): Assert that endpoint is valid.
+    return Promise.resolve(
+        {status: mojom.UsbTransferStatus.OK, bytesWritten: data.byteLength});
+  }
+
+  isochronousTransferIn(endpointNumber, packetLengths, timeout) {
+    assert_true(this.opened_);
+    assert_false(this.currentConfiguration_ == null, 'device configured');
+    // TODO(reillyg): Assert that endpoint is valid.
+    let data = new Array(packetLengths.reduce((a, b) => a + b, 0));
+    let dataOffset = 0;
+    let packets = new Array(packetLengths.length);
+    for (let i = 0; i < packetLengths.length; ++i) {
+      for (let j = 0; j < packetLengths[i]; ++j)
+        data[dataOffset++] = j & 0xff;
+      packets[i] = {
+        length: packetLengths[i],
+        transferredLength: packetLengths[i],
+        status: mojom.UsbTransferStatus.OK
+      };
+    }
+    return Promise.resolve({data: {buffer: data}, packets: packets});
+  }
+
+  isochronousTransferOut(endpointNumber, data, packetLengths, timeout) {
+    assert_true(this.opened_);
+    assert_false(this.currentConfiguration_ == null, 'device configured');
+    // TODO(reillyg): Assert that endpoint is valid.
+    let packets = new Array(packetLengths.length);
+    for (let i = 0; i < packetLengths.length; ++i) {
+      packets[i] = {
+        length: packetLengths[i],
+        transferredLength: packetLengths[i],
+        status: mojom.UsbTransferStatus.OK
+      };
+    }
+    return Promise.resolve({ packets: packets });
+  }
+}
+
+class FakeWebUsbService {
+  constructor() {
+    this.receiver_ = new mojom.WebUsbServiceReceiver(this);
+    this.devices_ = new Map();
+    this.devicesByGuid_ = new Map();
+    this.client_ = null;
+    this.nextGuid_ = 0;
+  }
+
+  addBinding(handle) {
+    this.receiver_.$.bindHandle(handle);
+  }
+
+  addDevice(fakeDevice, info) {
+    let device = {
+      fakeDevice: fakeDevice,
+      guid: (this.nextGuid_++).toString(),
+      info: info,
+      receivers: [],
+    };
+    this.devices_.set(fakeDevice, device);
+    this.devicesByGuid_.set(device.guid, device);
+    if (this.client_)
+      this.client_.onDeviceAdded(fakeDeviceInitToDeviceInfo(device.guid, info));
+  }
+
+  async forgetDevice(guid) {
+    // Permissions are currently untestable through WPT.
+  }
+
+  removeDevice(fakeDevice) {
+    let device = this.devices_.get(fakeDevice);
+    if (!device)
+      throw new Error('Cannot remove unknown device.');
+
+    for (const receiver of device.receivers)
+      receiver.$.close();
+    this.devices_.delete(device.fakeDevice);
+    this.devicesByGuid_.delete(device.guid);
+    if (this.client_) {
+      this.client_.onDeviceRemoved(
+          fakeDeviceInitToDeviceInfo(device.guid, device.info));
+    }
+  }
+
+  removeAllDevices() {
+    this.devices_.forEach(device => {
+      for (const receiver of device.receivers)
+        receiver.$.close();
+      this.client_.onDeviceRemoved(
+          fakeDeviceInitToDeviceInfo(device.guid, device.info));
+    });
+    this.devices_.clear();
+    this.devicesByGuid_.clear();
+  }
+
+  getDevices() {
+    let devices = [];
+    this.devices_.forEach(device => {
+      devices.push(fakeDeviceInitToDeviceInfo(device.guid, device.info));
+    });
+    return Promise.resolve({ results: devices });
+  }
+
+  getDevice(guid, request) {
+    let retrievedDevice = this.devicesByGuid_.get(guid);
+    if (retrievedDevice) {
+      const receiver =
+          new mojom.UsbDeviceReceiver(new FakeDevice(retrievedDevice.info));
+      receiver.$.bindHandle(request.handle);
+      receiver.onConnectionError.addListener(() => {
+        if (retrievedDevice.fakeDevice.onclose)
+          retrievedDevice.fakeDevice.onclose();
+      });
+      retrievedDevice.receivers.push(receiver);
+    } else {
+      request.handle.close();
+    }
+  }
+
+  getPermission(deviceFilters) {
+    return new Promise(resolve => {
+      if (navigator.usb.test.onrequestdevice) {
+        navigator.usb.test.onrequestdevice(
+            new USBDeviceRequestEvent(deviceFilters, resolve));
+      } else {
+        resolve({ result: null });
+      }
+    });
+  }
+
+  setClient(client) {
+    this.client_ = client;
+  }
+}
+
+class USBDeviceRequestEvent {
+  constructor(deviceFilters, resolve) {
+    this.filters = convertMojoDeviceFilters(deviceFilters);
+    this.resolveFunc_ = resolve;
+  }
+
+  respondWith(value) {
+    // Wait until |value| resolves (if it is a Promise). This function returns
+    // no value.
+    Promise.resolve(value).then(fakeDevice => {
+      let device = internal.webUsbService.devices_.get(fakeDevice);
+      let result = null;
+      if (device) {
+        result = fakeDeviceInitToDeviceInfo(device.guid, device.info);
+      }
+      this.resolveFunc_({ result: result });
+    }, () => {
+      this.resolveFunc_({ result: null });
+    });
+  }
+}
+
+// Unlike FakeDevice this class is exported to callers of USBTest.addFakeDevice.
+class FakeUSBDevice {
+  constructor() {
+    this.onclose = null;
+  }
+
+  disconnect() {
+    setTimeout(() => internal.webUsbService.removeDevice(this), 0);
+  }
+}
+
+class USBTest {
+  constructor() {
+    this.onrequestdevice = undefined;
+  }
+
+  async initialize() {
+    if (internal.initialized)
+      return;
+
+    // Be ready to handle 'ReadyForAttachment' message from child iframes.
+    if ('window' in self) {
+      getMessagePort(window);
+    }
+
+    mojom = await loadMojomDefinitions();
+    internal.webUsbService = new FakeWebUsbService();
+    internal.webUsbServiceInterceptor =
+        new MojoInterfaceInterceptor(mojom.WebUsbService.$interfaceName);
+    internal.webUsbServiceInterceptor.oninterfacerequest =
+        e => internal.webUsbService.addBinding(e.handle);
+    internal.webUsbServiceInterceptor.start();
+
+    // Wait for a call to GetDevices() to pass between the renderer and the
+    // mock in order to establish that everything is set up.
+    await navigator.usb.getDevices();
+    internal.initialized = true;
+  }
+
+  // Returns a promise that is resolved when the implementation of |usb| in the
+  // global scope for |context| is controlled by the current context.
+  attachToContext(context) {
+    if (!internal.initialized)
+      throw new Error('Call initialize() before attachToContext()');
+
+    let target = context.constructor.name === 'Worker' ? context : window;
+    return getMessagePort(target).then(() => {
+      return new Promise(resolve => {
+        internal.messagePort.onmessage = channelEvent => {
+          switch (channelEvent.data.type) {
+            case mojom.WebUsbService.$interfaceName:
+              internal.webUsbService.addBinding(channelEvent.data.handle);
+              break;
+            case 'Complete':
+              resolve();
+              break;
+          }
+        };
+        internal.messagePort.postMessage({
+          type: 'Attach',
+          interfaces: [
+            mojom.WebUsbService.$interfaceName,
+          ]
+        });
+      });
+    });
+  }
+
+  addFakeDevice(deviceInit) {
+    if (!internal.initialized)
+      throw new Error('Call initialize() before addFakeDevice().');
+
+    // |addDevice| and |removeDevice| are called in a setTimeout callback so
+    // that tests do not rely on the device being immediately available which
+    // may not be true for all implementations of this test API.
+    let fakeDevice = new FakeUSBDevice();
+    setTimeout(
+        () => internal.webUsbService.addDevice(fakeDevice, deviceInit), 0);
+    return fakeDevice;
+  }
+
+  reset() {
+    if (!internal.initialized)
+      throw new Error('Call initialize() before reset().');
+
+    // Reset the mocks in a setTimeout callback so that tests do not rely on
+    // the fact that this polyfill can do this synchronously.
+    return new Promise(resolve => {
+      setTimeout(() => {
+        if (internal.messagePort !== null)
+          internal.messagePort.close();
+        internal.messagePort = null;
+        internal.webUsbService.removeAllDevices();
+        resolve();
+      }, 0);
+    });
+  }
+}
+
+navigator.usb.test = new USBTest();
+
+})();
diff --git a/test/wpt/tests/resources/chromium/webusb-test.js.headers b/test/wpt/tests/resources/chromium/webusb-test.js.headers
new file mode 100644
index 00000000000..6805c323df5
--- /dev/null
+++ b/test/wpt/tests/resources/chromium/webusb-test.js.headers
@@ -0,0 +1 @@
+Content-Type: text/javascript; charset=utf-8
diff --git a/test/wpt/tests/resources/chromium/webxr-test-math-helper.js b/test/wpt/tests/resources/chromium/webxr-test-math-helper.js
new file mode 100644
index 00000000000..22c6c12d08f
--- /dev/null
+++ b/test/wpt/tests/resources/chromium/webxr-test-math-helper.js
@@ -0,0 +1,298 @@
+'use strict';
+
+// Math helper - used mainly in hit test implementation done by webxr-test.js
+class XRMathHelper {
+  static toString(p) {
+    return "[" + p.x + "," + p.y + "," + p.z + "," + p.w + "]";
+  }
+
+  static transform_by_matrix(matrix, point) {
+    return {
+      x : matrix[0] * point.x + matrix[4] * point.y + matrix[8] * point.z + matrix[12] * point.w,
+      y : matrix[1] * point.x + matrix[5] * point.y + matrix[9] * point.z + matrix[13] * point.w,
+      z : matrix[2] * point.x + matrix[6] * point.y + matrix[10] * point.z + matrix[14] * point.w,
+      w : matrix[3] * point.x + matrix[7] * point.y + matrix[11] * point.z + matrix[15] * point.w,
+    };
+  }
+
+  static neg(p) {
+    return {x : -p.x, y : -p.y, z : -p.z, w : p.w};
+  }
+
+  static sub(lhs, rhs) {
+    // .w is treated here like an entity type, 1 signifies points, 0 signifies vectors.
+    // point - point, point - vector, vector - vector are ok, vector - point is not.
+    if (lhs.w != rhs.w && lhs.w == 0.0) {
+      throw new Error("vector - point not allowed: " + toString(lhs) + "-" + toString(rhs));
+    }
+
+    return {x : lhs.x - rhs.x, y : lhs.y - rhs.y, z : lhs.z - rhs.z, w : lhs.w - rhs.w};
+  }
+
+  static add(lhs, rhs) {
+    if (lhs.w == rhs.w && lhs.w == 1.0) {
+      throw new Error("point + point not allowed", p1, p2);
+    }
+
+    return {x : lhs.x + rhs.x, y : lhs.y + rhs.y, z : lhs.z + rhs.z, w : lhs.w + rhs.w};
+  }
+
+  static cross(lhs, rhs) {
+    if (lhs.w != 0.0 || rhs.w != 0.0) {
+      throw new Error("cross product not allowed: " + toString(lhs) + "x" + toString(rhs));
+    }
+
+    return {
+      x : lhs.y * rhs.z - lhs.z * rhs.y,
+      y : lhs.z * rhs.x - lhs.x * rhs.z,
+      z : lhs.x * rhs.y - lhs.y * rhs.x,
+      w : 0
+    };
+  }
+
+  static dot(lhs, rhs) {
+    if (lhs.w != 0 || rhs.w != 0) {
+      throw new Error("dot product not allowed: " + toString(lhs) + "x" + toString(rhs));
+    }
+
+    return lhs.x * rhs.x + lhs.y * rhs.y + lhs.z * rhs.z;
+  }
+
+  static mul(scalar, vector) {
+    if (vector.w != 0) {
+      throw new Error("scalar * vector not allowed", scalar, vector);
+    }
+
+    return {x : vector.x * scalar, y : vector.y * scalar, z : vector.z * scalar, w : vector.w};
+  }
+
+  static length(vector) {
+    return Math.sqrt(XRMathHelper.dot(vector, vector));
+  }
+
+  static normalize(vector) {
+    const l = XRMathHelper.length(vector);
+    return XRMathHelper.mul(1.0/l, vector);
+  }
+
+  // All |face|'s points and |point| must be co-planar.
+  static pointInFace(point, face) {
+    const normalize = XRMathHelper.normalize;
+    const sub = XRMathHelper.sub;
+    const length = XRMathHelper.length;
+    const cross = XRMathHelper.cross;
+
+    let onTheRight = null;
+    let previous_point = face[face.length - 1];
+
+    // |point| is in |face| if it's on the same side of all the edges.
+    for (let i = 0; i < face.length; ++i) {
+      const current_point = face[i];
+
+      const edge_direction = normalize(sub(current_point, previous_point));
+      const turn_direction = normalize(sub(point, current_point));
+
+      const sin_turn_angle = length(cross(edge_direction, turn_direction));
+
+      if (onTheRight == null) {
+        onTheRight = sin_turn_angle >= 0;
+      } else {
+        if (onTheRight && sin_turn_angle < 0) return false;
+        if (!onTheRight && sin_turn_angle > 0) return false;
+      }
+
+      previous_point = current_point;
+    }
+
+    return true;
+  }
+
+  static det2x2(m00, m01, m10, m11) {
+    return m00 * m11 - m01 * m10;
+  }
+
+  static det3x3(
+    m00, m01, m02,
+    m10, m11, m12,
+    m20, m21, m22
+  ){
+    const det2x2 = XRMathHelper.det2x2;
+
+    return    m00 * det2x2(m11, m12, m21, m22)
+            - m01 * det2x2(m10, m12, m20, m22)
+            + m02 * det2x2(m10, m11, m20, m21);
+  }
+
+  static det4x4(
+    m00, m01, m02, m03,
+    m10, m11, m12, m13,
+    m20, m21, m22, m23,
+    m30, m31, m32, m33
+  ) {
+    const det3x3 = XRMathHelper.det3x3;
+
+    return  m00 * det3x3(m11, m12, m13,
+                         m21, m22, m23,
+                         m31, m32, m33)
+          - m01 * det3x3(m10, m12, m13,
+                         m20, m22, m23,
+                         m30, m32, m33)
+          + m02 * det3x3(m10, m11, m13,
+                         m20, m21, m23,
+                         m30, m31, m33)
+          - m03 * det3x3(m10, m11, m12,
+                         m20, m21, m22,
+                         m30, m31, m32);
+  }
+
+  static inv2(m) {
+    // mij - i-th column, j-th row
+    const m00 = m[0],  m01 = m[1],  m02 = m[2],  m03 = m[3];
+    const m10 = m[4],  m11 = m[5],  m12 = m[6],  m13 = m[7];
+    const m20 = m[8],  m21 = m[9],  m22 = m[10], m23 = m[11];
+    const m30 = m[12], m31 = m[13], m32 = m[14], m33 = m[15];
+
+    const det = det4x4(
+      m00, m01, m02, m03,
+      m10, m11, m12, m13,
+      m20, m21, m22, m23,
+      m30, m31, m32, m33
+    );
+  }
+
+  static transpose(m) {
+    const result = Array(16);
+    for (let i = 0; i < 4; i++) {
+      for (let j = 0; j < 4; j++) {
+        result[i * 4 + j] = m[j * 4 + i];
+      }
+    }
+    return result;
+  }
+
+  // Inverts the matrix, ported from transformation_matrix.cc.
+  static inverse(m) {
+    const det3x3 = XRMathHelper.det3x3;
+
+    // mij - i-th column, j-th row
+    const m00 = m[0],  m01 = m[1],  m02 = m[2],  m03 = m[3];
+    const m10 = m[4],  m11 = m[5],  m12 = m[6],  m13 = m[7];
+    const m20 = m[8],  m21 = m[9],  m22 = m[10], m23 = m[11];
+    const m30 = m[12], m31 = m[13], m32 = m[14], m33 = m[15];
+
+    const det = XRMathHelper.det4x4(
+      m00, m01, m02, m03,
+      m10, m11, m12, m13,
+      m20, m21, m22, m23,
+      m30, m31, m32, m33
+    );
+
+    if (Math.abs(det) < 0.0001) {
+      return null;
+    }
+
+    const invDet = 1.0 / det;
+    // Calculate `comatrix * 1/det`:
+    const result2 = [
+      // First column (m0r):
+      invDet * det3x3(m11, m12, m13, m21, m22, m23, m32, m32, m33),
+      -invDet * det3x3(m10, m12, m13, m20, m22, m23, m30, m32, m33),
+      invDet * det3x3(m10, m11, m13, m20, m21, m23, m30, m31, m33),
+      -invDet * det3x3(m10, m11, m12, m20, m21, m22, m30, m31, m32),
+      // Second column (m1r):
+      -invDet * det3x3(m01, m02, m03, m21, m22, m23, m32, m32, m33),
+      invDet * det3x3(m00, m02, m03, m20, m22, m23, m30, m32, m33),
+      -invDet * det3x3(m00, m01, m03, m20, m21, m23, m30, m31, m33),
+      invDet * det3x3(m00, m01, m02, m20, m21, m22, m30, m31, m32),
+      // Third column (m2r):
+      invDet * det3x3(m01, m02, m03, m11, m12, m13, m31, m32, m33),
+      -invDet * det3x3(m00, m02, m03, m10, m12, m13, m30, m32, m33),
+      invDet * det3x3(m00, m01, m03, m10, m11, m13, m30, m31, m33),
+      -invDet * det3x3(m00, m01, m02, m10, m11, m12, m30, m31, m32),
+      // Fourth column (m3r):
+      -invDet * det3x3(m01, m02, m03, m11, m12, m13, m21, m22, m23),
+      invDet * det3x3(m00, m02, m03, m10, m12, m13, m20, m22, m23),
+      -invDet * det3x3(m00, m01, m03, m10, m11, m13, m20, m21, m23),
+      invDet * det3x3(m00, m01, m02, m10, m11, m12, m20, m21, m22),
+    ];
+
+    // Actual inverse is `1/det * transposed(comatrix)`:
+    return XRMathHelper.transpose(result2);
+  }
+
+  static mul4x4(m1, m2) {
+    if (m1 == null || m2 == null) {
+      return null;
+    }
+
+    const result = Array(16);
+
+    for (let row = 0; row < 4; row++) {
+      for (let col = 0; col < 4; col++) {
+        result[4 * col + row] = 0;
+        for(let i = 0; i < 4; i++) {
+          result[4 * col + row] += m1[4 * i + row] * m2[4 * col + i];
+        }
+      }
+    }
+
+    return result;
+  }
+
+  // Decomposes a matrix, with the assumption that the passed in matrix is
+  // a rigid transformation (i.e. position and rotation *only*!).
+  // The result is an object with `position` and `orientation` keys, which should
+  // be compatible with FakeXRRigidTransformInit.
+  // The implementation should match the behavior of gfx::Transform, but assumes
+  // that scale, skew & perspective are not present in the matrix so it could be
+  // simplified.
+  static decomposeRigidTransform(m) {
+    const m00 = m[0],  m01 = m[1],  m02 = m[2],  m03 = m[3];
+    const m10 = m[4],  m11 = m[5],  m12 = m[6],  m13 = m[7];
+    const m20 = m[8],  m21 = m[9],  m22 = m[10], m23 = m[11];
+    const m30 = m[12], m31 = m[13], m32 = m[14], m33 = m[15];
+
+    const position = [m30, m31, m32];
+    const orientation = [0, 0, 0, 0];
+
+    const trace = m00 + m11 + m22;
+    if (trace > 0) {
+      const S = Math.sqrt(trace + 1) * 2;
+      orientation[3] = 0.25 * S;
+      orientation[0] = (m12 - m21) / S;
+      orientation[1] = (m20 - m02) / S;
+      orientation[2] = (m01 - m10) / S;
+    } else if (m00 > m11 && m00 > m22) {
+      const S = Math.sqrt(1.0 + m00 - m11 - m22) * 2;
+      orientation[3] = (m12 - m21) / S;
+      orientation[0] = 0.25 * S;
+      orientation[1] = (m01 + m10) / S;
+      orientation[2] = (m20 + m02) / S;
+    } else if (m11 > m22) {
+      const S = Math.sqrt(1.0 + m11 - m00 - m22) * 2;
+      orientation[3] = (m20 - m02) / S;
+      orientation[0] = (m01 + m10) / S;
+      orientation[1] = 0.25 * S;
+      orientation[2] = (m12 + m21) / S;
+    } else {
+      const S = Math.sqrt(1.0 + m22 - m00 - m11) * 2;
+      orientation[3] = (m01 - m10) / S;
+      orientation[0] = (m20 + m02) / S;
+      orientation[1] = (m12 + m21) / S;
+      orientation[2] = 0.25 * S;
+    }
+
+    return { position, orientation };
+  }
+
+  static identity() {
+    return [
+      1, 0, 0, 0,
+      0, 1, 0, 0,
+      0, 0, 1, 0,
+      0, 0, 0, 1
+    ];
+  };
+}
+
+XRMathHelper.EPSILON = 0.001;
diff --git a/test/wpt/tests/resources/chromium/webxr-test-math-helper.js.headers b/test/wpt/tests/resources/chromium/webxr-test-math-helper.js.headers
new file mode 100644
index 00000000000..6805c323df5
--- /dev/null
+++ b/test/wpt/tests/resources/chromium/webxr-test-math-helper.js.headers
@@ -0,0 +1 @@
+Content-Type: text/javascript; charset=utf-8
diff --git a/test/wpt/tests/resources/chromium/webxr-test.js b/test/wpt/tests/resources/chromium/webxr-test.js
new file mode 100644
index 00000000000..db61e1ce4d6
--- /dev/null
+++ b/test/wpt/tests/resources/chromium/webxr-test.js
@@ -0,0 +1,2126 @@
+import * as vrMojom from '/gen/device/vr/public/mojom/vr_service.mojom.m.js';
+import {GamepadHand, GamepadMapping} from '/gen/device/gamepad/public/mojom/gamepad.mojom.m.js';
+
+// This polyfill library implements the WebXR Test API as specified here:
+// https://github.com/immersive-web/webxr-test-api
+
+const defaultMojoFromFloor = {
+  matrix: [1, 0,     0, 0,
+           0, 1,     0, 0,
+           0, 0,     1, 0,
+           0, -1.65, 0, 1]
+};
+const default_stage_parameters = {
+  mojoFromFloor: defaultMojoFromFloor,
+  bounds: null
+};
+
+const default_framebuffer_scale = 0.7;
+
+function getMatrixFromTransform(transform) {
+  const x = transform.orientation[0];
+  const y = transform.orientation[1];
+  const z = transform.orientation[2];
+  const w = transform.orientation[3];
+
+  const m11 = 1.0 - 2.0 * (y * y + z * z);
+  const m21 = 2.0 * (x * y + z * w);
+  const m31 = 2.0 * (x * z - y * w);
+
+  const m12 = 2.0 * (x * y - z * w);
+  const m22 = 1.0 - 2.0 * (x * x + z * z);
+  const m32 = 2.0 * (y * z + x * w);
+
+  const m13 = 2.0 * (x * z + y * w);
+  const m23 = 2.0 * (y * z - x * w);
+  const m33 = 1.0 - 2.0 * (x * x + y * y);
+
+  const m14 = transform.position[0];
+  const m24 = transform.position[1];
+  const m34 = transform.position[2];
+
+  // Column-major linearized order is expected.
+  return [m11, m21, m31, 0,
+          m12, m22, m32, 0,
+          m13, m23, m33, 0,
+          m14, m24, m34, 1];
+}
+
+function getPoseFromTransform(transform) {
+  const [px, py, pz] = transform.position;
+  const [ox, oy, oz, ow] = transform.orientation;
+  return {
+    position: {x: px, y: py, z: pz},
+    orientation: {x: ox, y: oy, z: oz, w: ow},
+  };
+}
+
+function composeGFXTransform(fakeTransformInit) {
+  return {matrix: getMatrixFromTransform(fakeTransformInit)};
+}
+
+// Value equality for camera image init objects - they must contain `width` &
+// `height` properties and may contain `pixels` property.
+function isSameCameraImageInit(rhs, lhs) {
+  return lhs.width === rhs.width && lhs.height === rhs.height && lhs.pixels === rhs.pixels;
+}
+
+class ChromeXRTest {
+  constructor() {
+    this.mockVRService_ = new MockVRService();
+  }
+
+  // WebXR Test API
+  simulateDeviceConnection(init_params) {
+    return Promise.resolve(this.mockVRService_._addRuntime(init_params));
+  }
+
+  disconnectAllDevices() {
+    this.mockVRService_._removeAllRuntimes();
+    return Promise.resolve();
+  }
+
+  simulateUserActivation(callback) {
+    if (window.top !== window) {
+      // test_driver.click only works for the toplevel frame. This alternate
+      // Chrome-specific method is sufficient for starting an XR session in an
+      // iframe, and is used in platform-specific tests.
+      //
+      // TODO(https://github.com/web-platform-tests/wpt/issues/20282): use
+      // a cross-platform method if available.
+      xr_debug('simulateUserActivation', 'use eventSender');
+      document.addEventListener('click', callback);
+      eventSender.mouseMoveTo(0, 0);
+      eventSender.mouseDown();
+      eventSender.mouseUp();
+      document.removeEventListener('click', callback);
+      return;
+    }
+    const button = document.createElement('button');
+    button.textContent = 'click to continue test';
+    button.style.display = 'block';
+    button.style.fontSize = '20px';
+    button.style.padding = '10px';
+    button.onclick = () => {
+      callback();
+      document.body.removeChild(button);
+    };
+    document.body.appendChild(button);
+    test_driver.click(button);
+  }
+
+  // Helper method leveraged by chrome-specific setups.
+  Debug(name, msg) {
+    console.log(new Date().toISOString() + ' DEBUG[' + name + '] ' + msg);
+  }
+}
+
+// Mocking class definitions
+
+// Mock service implements the VRService mojo interface.
+class MockVRService {
+  constructor() {
+    this.receiver_ = new vrMojom.VRServiceReceiver(this);
+    this.runtimes_ = [];
+
+    this.interceptor_ =
+        new MojoInterfaceInterceptor(vrMojom.VRService.$interfaceName);
+    this.interceptor_.oninterfacerequest =
+        e => this.receiver_.$.bindHandle(e.handle);
+    this.interceptor_.start();
+  }
+
+  // WebXR Test API Implementation Helpers
+  _addRuntime(fakeDeviceInit) {
+    const runtime = new MockRuntime(fakeDeviceInit, this);
+    this.runtimes_.push(runtime);
+
+    if (this.client_) {
+      this.client_.onDeviceChanged();
+    }
+
+    return runtime;
+  }
+
+  _removeAllRuntimes() {
+    if (this.client_) {
+      this.client_.onDeviceChanged();
+    }
+
+    this.runtimes_ = [];
+  }
+
+  _removeRuntime(device) {
+    const index = this.runtimes_.indexOf(device);
+    if (index >= 0) {
+      this.runtimes_.splice(index, 1);
+      if (this.client_) {
+        this.client_.onDeviceChanged();
+      }
+    }
+  }
+
+  // VRService overrides
+  setClient(client) {
+    if (this.client_) {
+      throw new Error("setClient should only be called once");
+    }
+
+    this.client_ = client;
+  }
+
+  requestSession(sessionOptions) {
+    const requests = [];
+    // Request a session from all the runtimes.
+    for (let i = 0; i < this.runtimes_.length; i++) {
+      requests[i] = this.runtimes_[i]._requestRuntimeSession(sessionOptions);
+    }
+
+    return Promise.all(requests).then((results) => {
+      // Find and return the first successful result.
+      for (let i = 0; i < results.length; i++) {
+        if (results[i].session) {
+          // Construct a dummy metrics recorder
+          const metricsRecorderPtr = new vrMojom.XRSessionMetricsRecorderRemote();
+          metricsRecorderPtr.$.bindNewPipeAndPassReceiver().handle.close();
+
+          const success = {
+            session: results[i].session,
+            metricsRecorder: metricsRecorderPtr,
+          };
+
+          return {result: {success}};
+        }
+      }
+
+      // If there were no successful results, returns a null session.
+      return {
+        result: {failureReason: vrMojom.RequestSessionError.NO_RUNTIME_FOUND}
+      };
+    });
+  }
+
+  supportsSession(sessionOptions) {
+    const requests = [];
+    // Check supports on all the runtimes.
+    for (let i = 0; i < this.runtimes_.length; i++) {
+      requests[i] = this.runtimes_[i]._runtimeSupportsSession(sessionOptions);
+    }
+
+    return Promise.all(requests).then((results) => {
+      // Find and return the first successful result.
+      for (let i = 0; i < results.length; i++) {
+        if (results[i].supportsSession) {
+          return results[i];
+        }
+      }
+
+      // If there were no successful results, returns false.
+      return {supportsSession: false};
+    });
+  }
+
+  exitPresent() {
+    return Promise.resolve();
+  }
+
+  setFramesThrottled(throttled) {
+    this.setFramesThrottledImpl(throttled);
+  }
+
+  // We cannot override the mojom interceptors via the prototype; so this method
+  // and the above indirection exist to allow overrides by internal code.
+  setFramesThrottledImpl(throttled) {}
+
+  // Only handles asynchronous calls to makeXrCompatible. Synchronous calls are
+  // not supported in Javascript.
+  makeXrCompatible() {
+    if (this.runtimes_.length == 0) {
+      return {
+        xrCompatibleResult: vrMojom.XrCompatibleResult.kNoDeviceAvailable
+      };
+    }
+    return {xrCompatibleResult: vrMojom.XrCompatibleResult.kAlreadyCompatible};
+  }
+}
+
+class FakeXRAnchorController {
+  constructor() {
+    // Private properties.
+    this.device_ = null;
+    this.id_ = null;
+    this.dirty_ = true;
+
+    // Properties backing up public attributes / methods.
+    this.deleted_ = false;
+    this.paused_ = false;
+    this.anchorOrigin_ = XRMathHelper.identity();
+  }
+
+  // WebXR Test API (Anchors Extension)
+  get deleted() {
+    return this.deleted_;
+  }
+
+  pauseTracking() {
+    if(!this.paused_) {
+      this.paused_ = true;
+      this.dirty_ = true;
+    }
+  }
+
+  resumeTracking() {
+    if(this.paused_) {
+      this.paused_ = false;
+      this.dirty_ = true;
+    }
+  }
+
+  stopTracking() {
+    if(!this.deleted_) {
+      this.device_._deleteAnchorController(this.id_);
+
+      this.deleted_ = true;
+      this.dirty_ = true;
+    }
+  }
+
+  setAnchorOrigin(anchorOrigin) {
+    this.anchorOrigin_ = getMatrixFromTransform(anchorOrigin);
+    this.dirty_ = true;
+  }
+
+  // Internal implementation:
+  set id(value) {
+    this.id_ = value;
+  }
+
+  set device(value) {
+    this.device_ = value;
+  }
+
+  get dirty() {
+    return this.dirty_;
+  }
+
+  get paused() {
+    return this.paused_;
+  }
+
+  _markProcessed() {
+    this.dirty_ = false;
+  }
+
+  _getAnchorOrigin() {
+    return this.anchorOrigin_;
+  }
+}
+
+// Implements XRFrameDataProvider and XRPresentationProvider. Maintains a mock
+// for XRPresentationProvider. Implements FakeXRDevice test API.
+class MockRuntime {
+  // Mapping from string feature names to the corresponding mojo types.
+  // This is exposed as a member for extensibility.
+  static _featureToMojoMap = {
+    'viewer': vrMojom.XRSessionFeature.REF_SPACE_VIEWER,
+    'local': vrMojom.XRSessionFeature.REF_SPACE_LOCAL,
+    'local-floor': vrMojom.XRSessionFeature.REF_SPACE_LOCAL_FLOOR,
+    'bounded-floor': vrMojom.XRSessionFeature.REF_SPACE_BOUNDED_FLOOR,
+    'unbounded': vrMojom.XRSessionFeature.REF_SPACE_UNBOUNDED,
+    'hit-test': vrMojom.XRSessionFeature.HIT_TEST,
+    'dom-overlay': vrMojom.XRSessionFeature.DOM_OVERLAY,
+    'light-estimation': vrMojom.XRSessionFeature.LIGHT_ESTIMATION,
+    'anchors': vrMojom.XRSessionFeature.ANCHORS,
+    'depth-sensing': vrMojom.XRSessionFeature.DEPTH,
+    'secondary-views': vrMojom.XRSessionFeature.SECONDARY_VIEWS,
+    'camera-access': vrMojom.XRSessionFeature.CAMERA_ACCESS,
+    'layers': vrMojom.XRSessionFeature.LAYERS,
+  };
+
+  static _sessionModeToMojoMap = {
+    "inline": vrMojom.XRSessionMode.kInline,
+    "immersive-vr": vrMojom.XRSessionMode.kImmersiveVr,
+    "immersive-ar": vrMojom.XRSessionMode.kImmersiveAr,
+  };
+
+  static _environmentBlendModeToMojoMap = {
+    "opaque": vrMojom.XREnvironmentBlendMode.kOpaque,
+    "alpha-blend": vrMojom.XREnvironmentBlendMode.kAlphaBlend,
+    "additive": vrMojom.XREnvironmentBlendMode.kAdditive,
+  };
+
+  static _interactionModeToMojoMap = {
+    "screen-space": vrMojom.XRInteractionMode.kScreenSpace,
+    "world-space": vrMojom.XRInteractionMode.kWorldSpace,
+  };
+
+  constructor(fakeDeviceInit, service) {
+    this.sessionClient_ = null;
+    this.presentation_provider_ = new MockXRPresentationProvider();
+
+    this.pose_ = null;
+    this.next_frame_id_ = 0;
+    this.bounds_ = null;
+    this.send_mojo_space_reset_ = false;
+    this.stageParameters_ = null;
+    this.stageParametersId_ = 1;
+
+    this.service_ = service;
+
+    this.framesOfReference = {};
+
+    this.input_sources_ = new Map();
+    this.next_input_source_index_ = 1;
+
+    // Currently active hit test subscriptons.
+    this.hitTestSubscriptions_ = new Map();
+    // Currently active transient hit test subscriptions.
+    this.transientHitTestSubscriptions_ = new Map();
+    // ID of the next subscription to be assigned.
+    this.next_hit_test_id_ = 1n;
+
+    this.anchor_controllers_ = new Map();
+    // ID of the next anchor to be assigned.
+    this.next_anchor_id_ = 1n;
+    // Anchor creation callback (initially null, can be set by tests).
+    this.anchor_creation_callback_ = null;
+
+    this.depthSensingData_ = null;
+    this.depthSensingDataDirty_ = false;
+
+    let supportedModes = [];
+    if (fakeDeviceInit.supportedModes) {
+      supportedModes = fakeDeviceInit.supportedModes.slice();
+      if (fakeDeviceInit.supportedModes.length === 0) {
+        supportedModes = ["inline"];
+      }
+    } else {
+      // Back-compat mode.
+      console.warn("Please use `supportedModes` to signal which modes are supported by this device.");
+      if (fakeDeviceInit.supportsImmersive == null) {
+        throw new TypeError("'supportsImmersive' must be set");
+      }
+
+      supportedModes = ["inline"];
+      if (fakeDeviceInit.supportsImmersive) {
+        supportedModes.push("immersive-vr");
+      }
+    }
+
+    this.supportedModes_ = this._convertModesToEnum(supportedModes);
+    if (this.supportedModes_.length == 0) {
+      console.error("Device has empty supported modes array!");
+      throw new InvalidStateError();
+    }
+
+    if (fakeDeviceInit.viewerOrigin != null) {
+      this.setViewerOrigin(fakeDeviceInit.viewerOrigin);
+    }
+
+    if (fakeDeviceInit.floorOrigin != null) {
+      this.setFloorOrigin(fakeDeviceInit.floorOrigin);
+    }
+
+    if (fakeDeviceInit.world) {
+      this.setWorld(fakeDeviceInit.world);
+    }
+
+    if (fakeDeviceInit.depthSensingData) {
+      this.setDepthSensingData(fakeDeviceInit.depthSensingData);
+    }
+
+    this.defaultFramebufferScale_ = default_framebuffer_scale;
+    this.enviromentBlendMode_ = this._convertBlendModeToEnum(fakeDeviceInit.environmentBlendMode);
+    this.interactionMode_ = this._convertInteractionModeToEnum(fakeDeviceInit.interactionMode);
+
+    // This appropriately handles if the coordinates are null
+    this.setBoundsGeometry(fakeDeviceInit.boundsCoordinates);
+
+    this.setViews(fakeDeviceInit.views, fakeDeviceInit.secondaryViews);
+
+    // Need to support webVR which doesn't have a notion of features
+    this._setFeatures(fakeDeviceInit.supportedFeatures || []);
+  }
+
+  // WebXR Test API
+  setViews(primaryViews, secondaryViews) {
+    this.cameraImage_ = null;
+    this.primaryViews_ = [];
+    this.secondaryViews_ = [];
+    let xOffset = 0;
+    if (primaryViews) {
+      this.primaryViews_ = [];
+      xOffset = this._setViews(primaryViews, xOffset, this.primaryViews_);
+      const cameraImage = this._findCameraImage(primaryViews);
+
+      if (cameraImage) {
+        this.cameraImage_ = cameraImage;
+      }
+    }
+
+    if (secondaryViews) {
+      this.secondaryViews_ = [];
+      this._setViews(secondaryViews, xOffset, this.secondaryViews_);
+      const cameraImage = this._findCameraImage(secondaryViews);
+
+      if (cameraImage) {
+        if (!isSameCameraImageInit(this.cameraImage_, cameraImage)) {
+          throw new Error("If present, camera resolutions on each view must match each other!"
+                          + " Secondary views' camera doesn't match primary views.");
+        }
+
+        this.cameraImage_ = cameraImage;
+      }
+    }
+  }
+
+  disconnect() {
+    this.service_._removeRuntime(this);
+    this.presentation_provider_._close();
+    if (this.sessionClient_) {
+      this.sessionClient_.$.close();
+      this.sessionClient_ = null;
+    }
+
+    return Promise.resolve();
+  }
+
+  setViewerOrigin(origin, emulatedPosition = false) {
+    const p = origin.position;
+    const q = origin.orientation;
+    this.pose_ = {
+      orientation: { x: q[0], y: q[1], z: q[2], w: q[3] },
+      position: { x: p[0], y: p[1], z: p[2] },
+      emulatedPosition: emulatedPosition,
+      angularVelocity: null,
+      linearVelocity: null,
+      angularAcceleration: null,
+      linearAcceleration: null,
+      inputState: null,
+      poseIndex: 0
+    };
+  }
+
+  clearViewerOrigin() {
+    this.pose_ = null;
+  }
+
+  setFloorOrigin(floorOrigin) {
+    if (!this.stageParameters_) {
+      this.stageParameters_ = default_stage_parameters;
+      this.stageParameters_.bounds = this.bounds_;
+    }
+
+    // floorOrigin is passed in as mojoFromFloor.
+    this.stageParameters_.mojoFromFloor =
+        {matrix: getMatrixFromTransform(floorOrigin)};
+
+    this._onStageParametersUpdated();
+  }
+
+  clearFloorOrigin() {
+    if (this.stageParameters_) {
+      this.stageParameters_ = null;
+      this._onStageParametersUpdated();
+    }
+  }
+
+  setBoundsGeometry(bounds) {
+    if (bounds == null) {
+      this.bounds_ = null;
+    } else if (bounds.length < 3) {
+      throw new Error("Bounds must have a length of at least 3");
+    } else {
+      this.bounds_ = bounds;
+    }
+
+    // We can only set bounds if we have stageParameters set; otherwise, we
+    // don't know the transform from local space to bounds space.
+    // We'll cache the bounds so that they can be set in the future if the
+    // floorLevel transform is set, but we won't update them just yet.
+    if (this.stageParameters_) {
+      this.stageParameters_.bounds = this.bounds_;
+      this._onStageParametersUpdated();
+    }
+  }
+
+  simulateResetPose() {
+    this.send_mojo_space_reset_ = true;
+  }
+
+  simulateVisibilityChange(visibilityState) {
+    let mojoState = null;
+    switch (visibilityState) {
+      case "visible":
+        mojoState = vrMojom.XRVisibilityState.VISIBLE;
+        break;
+      case "visible-blurred":
+        mojoState = vrMojom.XRVisibilityState.VISIBLE_BLURRED;
+        break;
+      case "hidden":
+        mojoState = vrMojom.XRVisibilityState.HIDDEN;
+        break;
+    }
+    if (mojoState && this.sessionClient_) {
+      this.sessionClient_.onVisibilityStateChanged(mojoState);
+    }
+  }
+
+  simulateInputSourceConnection(fakeInputSourceInit) {
+    const index = this.next_input_source_index_;
+    this.next_input_source_index_++;
+
+    const source = new MockXRInputSource(fakeInputSourceInit, index, this);
+    this.input_sources_.set(index, source);
+    return source;
+  }
+
+  // WebXR Test API Hit Test extensions
+  setWorld(world) {
+    this.world_ = world;
+  }
+
+  clearWorld() {
+    this.world_ = null;
+  }
+
+  // WebXR Test API Anchor extensions
+  setAnchorCreationCallback(callback) {
+    this.anchor_creation_callback_ = callback;
+  }
+
+  setHitTestSourceCreationCallback(callback) {
+    this.hit_test_source_creation_callback_ = callback;
+  }
+
+  // WebXR Test API Lighting estimation extensions
+  setLightEstimate(fakeXrLightEstimateInit) {
+    if (!fakeXrLightEstimateInit.sphericalHarmonicsCoefficients) {
+      throw new TypeError("sphericalHarmonicsCoefficients must be set");
+    }
+
+    if (fakeXrLightEstimateInit.sphericalHarmonicsCoefficients.length != 27) {
+      throw new TypeError("Must supply all 27 sphericalHarmonicsCoefficients");
+    }
+
+    if (fakeXrLightEstimateInit.primaryLightDirection && fakeXrLightEstimateInit.primaryLightDirection.w != 0) {
+      throw new TypeError("W component of primaryLightDirection must be 0");
+    }
+
+    if (fakeXrLightEstimateInit.primaryLightIntensity && fakeXrLightEstimateInit.primaryLightIntensity.w != 1) {
+      throw new TypeError("W component of primaryLightIntensity must be 1");
+    }
+
+    // If the primaryLightDirection or primaryLightIntensity aren't set, we need to set them
+    // to the defaults that the spec expects. ArCore will either give us everything or nothing,
+    // so these aren't nullable on the mojom.
+    if (!fakeXrLightEstimateInit.primaryLightDirection) {
+      fakeXrLightEstimateInit.primaryLightDirection = { x: 0.0, y: 1.0, z: 0.0, w: 0.0 };
+    }
+
+    if (!fakeXrLightEstimateInit.primaryLightIntensity) {
+      fakeXrLightEstimateInit.primaryLightIntensity = { x: 0.0, y: 0.0, z: 0.0, w: 1.0 };
+    }
+
+    let c = fakeXrLightEstimateInit.sphericalHarmonicsCoefficients;
+
+    this.light_estimate_ = {
+      lightProbe: {
+        // XRSphereicalHarmonics
+        sphericalHarmonics: {
+          coefficients: [
+            { red: c[0],  green: c[1],  blue: c[2] },
+            { red: c[3],  green: c[4],  blue: c[5] },
+            { red: c[6],  green: c[7],  blue: c[8] },
+            { red: c[9],  green: c[10], blue: c[11] },
+            { red: c[12], green: c[13], blue: c[14] },
+            { red: c[15], green: c[16], blue: c[17] },
+            { red: c[18], green: c[19], blue: c[20] },
+            { red: c[21], green: c[22], blue: c[23] },
+            { red: c[24], green: c[25], blue: c[26] }
+          ]
+        },
+        // Vector3dF
+        mainLightDirection: {
+          x: fakeXrLightEstimateInit.primaryLightDirection.x,
+          y: fakeXrLightEstimateInit.primaryLightDirection.y,
+          z: fakeXrLightEstimateInit.primaryLightDirection.z
+        },
+        // RgbTupleF32
+        mainLightIntensity: {
+          red:   fakeXrLightEstimateInit.primaryLightIntensity.x,
+          green: fakeXrLightEstimateInit.primaryLightIntensity.y,
+          blue:  fakeXrLightEstimateInit.primaryLightIntensity.z
+        }
+      }
+    }
+  }
+
+  // WebXR Test API depth Sensing Extensions
+  setDepthSensingData(depthSensingData) {
+    for(const key of ["depthData", "normDepthBufferFromNormView", "rawValueToMeters", "width", "height"]) {
+      if(!(key in depthSensingData)) {
+        throw new TypeError("Required key not present. Key: " + key);
+      }
+    }
+
+    if(depthSensingData.depthData != null) {
+      // Create new object w/ properties based on the depthSensingData, but
+      // convert the FakeXRRigidTransformInit into a transformation matrix object.
+      this.depthSensingData_ = Object.assign({},
+        depthSensingData, {
+          normDepthBufferFromNormView: composeGFXTransform(depthSensingData.normDepthBufferFromNormView),
+        });
+    } else {
+      throw new TypeError("`depthData` is not set");
+    }
+
+    this.depthSensingDataDirty_ = true;
+  }
+
+  clearDepthSensingData() {
+    this.depthSensingData_ = null;
+    this.depthSensingDataDirty_ = true;
+  }
+
+  // Internal Implementation/Helper Methods
+  _convertModeToEnum(sessionMode) {
+    if (sessionMode in MockRuntime._sessionModeToMojoMap) {
+      return MockRuntime._sessionModeToMojoMap[sessionMode];
+    }
+
+    throw new TypeError("Unrecognized value for XRSessionMode enum: " + sessionMode);
+  }
+
+  _convertModesToEnum(sessionModes) {
+    return sessionModes.map(mode => this._convertModeToEnum(mode));
+  }
+
+  _convertBlendModeToEnum(blendMode) {
+    if (blendMode in MockRuntime._environmentBlendModeToMojoMap) {
+      return MockRuntime._environmentBlendModeToMojoMap[blendMode];
+    } else {
+      if (this.supportedModes_.includes(vrMojom.XRSessionMode.kImmersiveAr)) {
+        return vrMojom.XREnvironmentBlendMode.kAdditive;
+      } else if (this.supportedModes_.includes(
+            vrMojom.XRSessionMode.kImmersiveVr)) {
+        return vrMojom.XREnvironmentBlendMode.kOpaque;
+      }
+    }
+  }
+
+  _convertInteractionModeToEnum(interactionMode) {
+    if (interactionMode in MockRuntime._interactionModeToMojoMap) {
+      return MockRuntime._interactionModeToMojoMap[interactionMode];
+    } else {
+      return vrMojom.XRInteractionMode.kWorldSpace;
+    }
+  }
+
+  _setViews(deviceViews, xOffset, views) {
+    for (let i = 0; i < deviceViews.length; i++) {
+      views[i] = this._getView(deviceViews[i], xOffset);
+      xOffset += deviceViews[i].resolution.width;
+    }
+
+    return xOffset;
+  }
+
+  _findCameraImage(views) {
+    const viewWithCamera = views.find(view => view.cameraImageInit);
+    if (viewWithCamera) {
+      //If we have one view with a camera resolution, all views should have the same camera resolution.
+      const allViewsHaveSameCamera = views.every(
+        view => isSameCameraImageInit(view.cameraImageInit, viewWithCamera.cameraImageInit));
+
+      if (!allViewsHaveSameCamera) {
+        throw new Error("If present, camera resolutions on each view must match each other!");
+      }
+
+      return viewWithCamera.cameraImageInit;
+    }
+
+    return null;
+  }
+
+  _onStageParametersUpdated() {
+    // Indicate for the frame loop that the stage parameters have been updated.
+    this.stageParametersId_++;
+  }
+
+  _getDefaultViews() {
+    if (this.primaryViews_) {
+      return this.primaryViews_;
+    }
+
+    const viewport_size = 20;
+    return [{
+        eye: vrMojom.XREye.kLeft,
+        fieldOfView: {
+          upDegrees: 48.316,
+          downDegrees: 50.099,
+          leftDegrees: 50.899,
+          rightDegrees: 35.197
+        },
+        mojoFromView: this._getMojoFromViewerWithOffset(composeGFXTransform({
+          position: [-0.032, 0, 0],
+          orientation: [0, 0, 0, 1]
+        })),
+        viewport: { x: 0, y: 0, width: viewport_size, height: viewport_size }
+      },
+      {
+        eye: vrMojom.XREye.kRight,
+        fieldOfView: {
+          upDegrees: 48.316,
+          downDegrees: 50.099,
+          leftDegrees: 50.899,
+          rightDegrees: 35.197
+        },
+        mojoFromView: this._getMojoFromViewerWithOffset(composeGFXTransform({
+          position: [0.032, 0, 0],
+          orientation: [0, 0, 0, 1]
+        })),
+        viewport: { x: viewport_size, y: 0, width: viewport_size, height: viewport_size }
+      }];
+  }
+
+  // This function converts between the matrix provided by the WebXR test API
+  // and the internal data representation.
+  _getView(fakeXRViewInit, xOffset) {
+    let fov = null;
+
+    if (fakeXRViewInit.fieldOfView) {
+      fov = {
+        upDegrees: fakeXRViewInit.fieldOfView.upDegrees,
+        downDegrees: fakeXRViewInit.fieldOfView.downDegrees,
+        leftDegrees: fakeXRViewInit.fieldOfView.leftDegrees,
+        rightDegrees: fakeXRViewInit.fieldOfView.rightDegrees
+      };
+    } else {
+      const m = fakeXRViewInit.projectionMatrix;
+
+      function toDegrees(tan) {
+        return Math.atan(tan) * 180 / Math.PI;
+      }
+
+      const leftTan = (1 - m[8]) / m[0];
+      const rightTan = (1 + m[8]) / m[0];
+      const upTan = (1 + m[9]) / m[5];
+      const downTan = (1 - m[9]) / m[5];
+
+      fov = {
+        upDegrees: toDegrees(upTan),
+        downDegrees: toDegrees(downTan),
+        leftDegrees: toDegrees(leftTan),
+        rightDegrees: toDegrees(rightTan)
+      };
+    }
+
+    let viewEye = vrMojom.XREye.kNone;
+    // The eye passed in corresponds to the values in the WebXR spec, which are
+    // the strings "none", "left", and "right". They should be converted to the
+    // corresponding values of XREye in vr_service.mojom.
+    switch(fakeXRViewInit.eye) {
+      case "none":
+        viewEye = vrMojom.XREye.kNone;
+        break;
+      case "left":
+        viewEye = vrMojom.XREye.kLeft;
+        break;
+      case "right":
+        viewEye = vrMojom.XREye.kRight;
+        break;
+    }
+
+    return {
+      eye: viewEye,
+      fieldOfView: fov,
+      mojoFromView: this._getMojoFromViewerWithOffset(composeGFXTransform(fakeXRViewInit.viewOffset)),
+      viewport: {
+        x: xOffset,
+        y: 0,
+        width: fakeXRViewInit.resolution.width,
+        height: fakeXRViewInit.resolution.height
+      },
+      isFirstPersonObserver: fakeXRViewInit.isFirstPersonObserver ? true : false,
+      viewOffset: composeGFXTransform(fakeXRViewInit.viewOffset)
+    };
+  }
+
+  _setFeatures(supportedFeatures) {
+    function convertFeatureToMojom(feature) {
+      if (feature in MockRuntime._featureToMojoMap) {
+        return MockRuntime._featureToMojoMap[feature];
+      } else {
+        return vrMojom.XRSessionFeature.INVALID;
+      }
+    }
+
+    this.supportedFeatures_ = [];
+
+    for (let i = 0; i < supportedFeatures.length; i++) {
+      const feature = convertFeatureToMojom(supportedFeatures[i]);
+      if (feature !== vrMojom.XRSessionFeature.INVALID) {
+        this.supportedFeatures_.push(feature);
+      }
+    }
+  }
+
+  // These methods are intended to be used by MockXRInputSource only.
+  _addInputSource(source) {
+    if (!this.input_sources_.has(source.source_id_)) {
+      this.input_sources_.set(source.source_id_, source);
+    }
+  }
+
+  _removeInputSource(source) {
+    this.input_sources_.delete(source.source_id_);
+  }
+
+  // These methods are intended to be used by FakeXRAnchorController only.
+  _deleteAnchorController(controllerId) {
+    this.anchor_controllers_.delete(controllerId);
+  }
+
+  // Extension point for non-standard modules.
+  _injectAdditionalFrameData(options, frameData) {
+  }
+
+  // Mojo function implementations.
+
+  // XRFrameDataProvider implementation.
+  getFrameData(options) {
+    return new Promise((resolve) => {
+
+      const populatePose = () => {
+        const mojo_space_reset = this.send_mojo_space_reset_;
+        this.send_mojo_space_reset_ = false;
+
+        if (this.pose_) {
+          this.pose_.poseIndex++;
+        }
+
+        // Setting the input_state to null tests a slightly different path than
+        // the browser tests where if the last input source is removed, the device
+        // code always sends up an empty array, but it's also valid mojom to send
+        // up a null array.
+        let input_state = null;
+        if (this.input_sources_.size > 0) {
+          input_state = [];
+          for (const input_source of this.input_sources_.values()) {
+            input_state.push(input_source._getInputSourceState());
+          }
+        }
+
+        let frame_views = this.primaryViews_;
+        for (let i = 0; i < this.primaryViews_.length; i++) {
+          this.primaryViews_[i].mojoFromView =
+            this._getMojoFromViewerWithOffset(this.primaryViews_[i].viewOffset);
+        }
+        if (this.enabledFeatures_.includes(vrMojom.XRSessionFeature.SECONDARY_VIEWS)) {
+          for (let i = 0; i < this.secondaryViews_.length; i++) {
+            this.secondaryViews_[i].mojoFromView =
+              this._getMojoFromViewerWithOffset(this.secondaryViews_[i].viewOffset);
+          }
+
+          frame_views = frame_views.concat(this.secondaryViews_);
+        }
+
+        const frameData = {
+          mojoFromViewer: this.pose_,
+          views: frame_views,
+          mojoSpaceReset: mojo_space_reset,
+          inputState: input_state,
+          timeDelta: {
+            // window.performance.now() is in milliseconds, so convert to microseconds.
+            microseconds: BigInt(Math.floor(window.performance.now() * 1000)),
+          },
+          frameId: this.next_frame_id_,
+          bufferHolder: null,
+          cameraImageSize: this.cameraImage_ ? {
+            width: this.cameraImage_.width,
+            height: this.cameraImage_.height
+          } : null,
+          renderingTimeRatio: 0,
+          stageParameters: this.stageParameters_,
+          stageParametersId: this.stageParametersId_,
+          lightEstimationData: this.light_estimate_
+        };
+
+        this.next_frame_id_++;
+
+        this._calculateHitTestResults(frameData);
+
+        this._calculateAnchorInformation(frameData);
+
+        this._calculateDepthInformation(frameData);
+
+        this._injectAdditionalFrameData(options, frameData);
+
+        resolve({frameData});
+      };
+
+      if(this.sessionOptions_.mode == vrMojom.XRSessionMode.kInline) {
+        // Inline sessions should not have a delay introduced since it causes them
+        // to miss a vsync blink-side and delays propagation of changes that happened
+        // within a rAFcb by one frame (e.g. setViewerOrigin() calls would take 2 frames
+        // to propagate).
+        populatePose();
+      } else {
+        // For immerive sessions, add additional delay to allow for anchor creation
+        // promises to run.
+        setTimeout(populatePose, 3);  // note: according to MDN, the timeout is not exact
+      }
+    });
+  }
+
+  getEnvironmentIntegrationProvider(environmentProviderRequest) {
+    if (this.environmentProviderReceiver_) {
+      this.environmentProviderReceiver_.$.close();
+    }
+    this.environmentProviderReceiver_ =
+        new vrMojom.XREnvironmentIntegrationProviderReceiver(this);
+    this.environmentProviderReceiver_.$.bindHandle(
+        environmentProviderRequest.handle);
+  }
+
+  setInputSourceButtonListener(listener) { listener.$.close(); }
+
+  // XREnvironmentIntegrationProvider implementation:
+  subscribeToHitTest(nativeOriginInformation, entityTypes, ray) {
+    if (!this.supportedModes_.includes(vrMojom.XRSessionMode.kImmersiveAr)) {
+      // Reject outside of AR.
+      return Promise.resolve({
+        result : vrMojom.SubscribeToHitTestResult.FAILURE_GENERIC,
+        subscriptionId : 0n
+      });
+    }
+
+    if (!this._nativeOriginKnown(nativeOriginInformation)) {
+      return Promise.resolve({
+        result : vrMojom.SubscribeToHitTestResult.FAILURE_GENERIC,
+        subscriptionId : 0n
+      });
+    }
+
+    // Reserve the id for hit test source:
+    const id = this.next_hit_test_id_++;
+    const hitTestParameters = { isTransient: false, profileName: null };
+    const controller = new FakeXRHitTestSourceController(id);
+
+
+    return this._shouldHitTestSourceCreationSucceed(hitTestParameters, controller)
+      .then((succeeded) => {
+        if(succeeded) {
+          // Store the subscription information as-is (including controller):
+          this.hitTestSubscriptions_.set(id, { nativeOriginInformation, entityTypes, ray, controller });
+
+          return Promise.resolve({
+            result : vrMojom.SubscribeToHitTestResult.SUCCESS,
+            subscriptionId : id
+          });
+        } else {
+          return Promise.resolve({
+            result : vrMojom.SubscribeToHitTestResult.FAILURE_GENERIC,
+            subscriptionId : 0n
+          });
+        }
+      });
+  }
+
+  subscribeToHitTestForTransientInput(profileName, entityTypes, ray){
+    if (!this.supportedModes_.includes(vrMojom.XRSessionMode.kImmersiveAr)) {
+      // Reject outside of AR.
+      return Promise.resolve({
+        result : vrMojom.SubscribeToHitTestResult.FAILURE_GENERIC,
+        subscriptionId : 0n
+      });
+    }
+
+    const id = this.next_hit_test_id_++;
+    const hitTestParameters = { isTransient: true, profileName: profileName };
+    const controller = new FakeXRHitTestSourceController(id);
+
+    // Check if we have hit test source creation callback.
+    // If yes, ask it if the hit test source creation should succeed.
+    // If no, for back-compat, assume the hit test source creation succeeded.
+    return this._shouldHitTestSourceCreationSucceed(hitTestParameters, controller)
+      .then((succeeded) => {
+        if(succeeded) {
+          // Store the subscription information as-is (including controller):
+          this.transientHitTestSubscriptions_.set(id, { profileName, entityTypes, ray, controller });
+
+          return Promise.resolve({
+            result : vrMojom.SubscribeToHitTestResult.SUCCESS,
+            subscriptionId : id
+          });
+        } else {
+          return Promise.resolve({
+            result : vrMojom.SubscribeToHitTestResult.FAILURE_GENERIC,
+            subscriptionId : 0n
+          });
+        }
+      });
+  }
+
+  unsubscribeFromHitTest(subscriptionId) {
+    let controller = null;
+    if(this.transientHitTestSubscriptions_.has(subscriptionId)){
+      controller = this.transientHitTestSubscriptions_.get(subscriptionId).controller;
+      this.transientHitTestSubscriptions_.delete(subscriptionId);
+    } else if(this.hitTestSubscriptions_.has(subscriptionId)){
+      controller = this.hitTestSubscriptions_.get(subscriptionId).controller;
+      this.hitTestSubscriptions_.delete(subscriptionId);
+    }
+
+    if(controller) {
+      controller.deleted = true;
+    }
+  }
+
+  createAnchor(nativeOriginInformation, nativeOriginFromAnchor) {
+    return new Promise((resolve) => {
+      if(this.anchor_creation_callback_ == null) {
+        resolve({
+          result : vrMojom.CreateAnchorResult.FAILURE,
+          anchorId : 0n
+        });
+
+        return;
+      }
+
+      const mojoFromNativeOrigin = this._getMojoFromNativeOrigin(nativeOriginInformation);
+      if(mojoFromNativeOrigin == null) {
+        resolve({
+          result : vrMojom.CreateAnchorResult.FAILURE,
+          anchorId : 0n
+        });
+
+        return;
+      }
+
+      const mojoFromAnchor = XRMathHelper.mul4x4(mojoFromNativeOrigin, nativeOriginFromAnchor);
+
+      const anchorCreationParameters = {
+        requestedAnchorOrigin: mojoFromAnchor,
+        isAttachedToEntity: false,
+      };
+
+      const anchorController = new FakeXRAnchorController();
+
+      this.anchor_creation_callback_(anchorCreationParameters, anchorController)
+            .then((result) => {
+              if(result) {
+                // If the test allowed the anchor creation,
+                // store the anchor controller & return success.
+
+                const anchor_id = this.next_anchor_id_;
+                this.next_anchor_id_++;
+
+                this.anchor_controllers_.set(anchor_id, anchorController);
+                anchorController.device = this;
+                anchorController.id = anchor_id;
+
+                resolve({
+                  result : vrMojom.CreateAnchorResult.SUCCESS,
+                  anchorId : anchor_id
+                });
+              } else {
+                // The test has rejected anchor creation.
+                resolve({
+                  result : vrMojom.CreateAnchorResult.FAILURE,
+                  anchorId : 0n
+                });
+              }
+            })
+            .catch(() => {
+              // The test threw an error, treat anchor creation as failed.
+              resolve({
+                result : vrMojom.CreateAnchorResult.FAILURE,
+                anchorId : 0n
+              });
+            });
+    });
+  }
+
+  createPlaneAnchor(planeFromAnchor, planeId) {
+    return new Promise((resolve) => {
+
+      // Not supported yet.
+
+      resolve({
+        result : vrMojom.CreateAnchorResult.FAILURE,
+        anchorId : 0n,
+      });
+    });
+  }
+
+  detachAnchor(anchorId) {}
+
+  // Utility function
+  _requestRuntimeSession(sessionOptions) {
+    return this._runtimeSupportsSession(sessionOptions).then((result) => {
+      // The JavaScript bindings convert c_style_names to camelCase names.
+      const options = {
+        transportMethod:
+            vrMojom.XRPresentationTransportMethod.SUBMIT_AS_MAILBOX_HOLDER,
+        waitForTransferNotification: true,
+        waitForRenderNotification: true,
+        waitForGpuFence: false,
+      };
+
+      let submit_frame_sink;
+      if (result.supportsSession) {
+        submit_frame_sink = {
+          clientReceiver: this.presentation_provider_._getClientReceiver(),
+          provider: this.presentation_provider_._bindProvider(sessionOptions),
+          transportOptions: options
+        };
+
+        const dataProviderPtr = new vrMojom.XRFrameDataProviderRemote();
+        this.dataProviderReceiver_ =
+            new vrMojom.XRFrameDataProviderReceiver(this);
+        this.dataProviderReceiver_.$.bindHandle(
+            dataProviderPtr.$.bindNewPipeAndPassReceiver().handle);
+        this.sessionOptions_ = sessionOptions;
+
+        this.sessionClient_ = new vrMojom.XRSessionClientRemote();
+        const clientReceiver = this.sessionClient_.$.bindNewPipeAndPassReceiver();
+
+        const enabled_features = [];
+        for (let i = 0; i < sessionOptions.requiredFeatures.length; i++) {
+          if (this.supportedFeatures_.indexOf(sessionOptions.requiredFeatures[i]) !== -1) {
+            enabled_features.push(sessionOptions.requiredFeatures[i]);
+          } else {
+            return Promise.resolve({session: null});
+          }
+        }
+
+        for (let i =0; i < sessionOptions.optionalFeatures.length; i++) {
+          if (this.supportedFeatures_.indexOf(sessionOptions.optionalFeatures[i]) !== -1) {
+            enabled_features.push(sessionOptions.optionalFeatures[i]);
+          }
+        }
+
+        this.enabledFeatures_ = enabled_features;
+
+        return Promise.resolve({
+          session: {
+            submitFrameSink: submit_frame_sink,
+            dataProvider: dataProviderPtr,
+            clientReceiver: clientReceiver,
+            enabledFeatures: enabled_features,
+            deviceConfig: {
+              usesInputEventing: false,
+              defaultFramebufferScale: this.defaultFramebufferScale_,
+              supportsViewportScaling: true,
+              depthConfiguration:
+                enabled_features.includes(vrMojom.XRSessionFeature.DEPTH) ? {
+                  depthUsage: vrMojom.XRDepthUsage.kCPUOptimized,
+                  depthDataFormat: vrMojom.XRDepthDataFormat.kLuminanceAlpha,
+                } : null,
+              views: this._getDefaultViews(),
+            },
+            enviromentBlendMode: this.enviromentBlendMode_,
+            interactionMode: this.interactionMode_
+          }
+        });
+      } else {
+        return Promise.resolve({session: null});
+      }
+    });
+  }
+
+  _runtimeSupportsSession(options) {
+    let result = this.supportedModes_.includes(options.mode);
+
+    if (options.requiredFeatures.includes(vrMojom.XRSessionFeature.DEPTH)
+    || options.optionalFeatures.includes(vrMojom.XRSessionFeature.DEPTH)) {
+      result &= options.depthOptions.usagePreferences.includes(vrMojom.XRDepthUsage.kCPUOptimized);
+      result &= options.depthOptions.dataFormatPreferences.includes(vrMojom.XRDepthDataFormat.kLuminanceAlpha);
+    }
+
+    return Promise.resolve({
+      supportsSession: result,
+    });
+  }
+
+  // Private functions - utilities:
+  _nativeOriginKnown(nativeOriginInformation){
+
+    if (nativeOriginInformation.inputSourceSpaceInfo !== undefined) {
+      if (!this.input_sources_.has(nativeOriginInformation.inputSourceSpaceInfo.inputSourceId)) {
+        // Unknown input source.
+        return false;
+      }
+
+      return true;
+    } else if (nativeOriginInformation.referenceSpaceType !== undefined) {
+      // Bounded_floor & unbounded ref spaces are not yet supported for AR:
+      if (nativeOriginInformation.referenceSpaceType == vrMojom.XRReferenceSpaceType.kUnbounded
+       || nativeOriginInformation.referenceSpaceType == vrMojom.XRReferenceSpaceType.kBoundedFloor) {
+        return false;
+      }
+
+      return true;
+    } else {
+      // Planes and anchors are not yet supported by the mock interface.
+      return false;
+    }
+  }
+
+  // Private functions - anchors implementation:
+
+  // Modifies passed in frameData to add anchor information.
+  _calculateAnchorInformation(frameData) {
+    if (!this.supportedModes_.includes(vrMojom.XRSessionMode.kImmersiveAr)) {
+      return;
+    }
+
+    frameData.anchorsData = {allAnchorsIds: [], updatedAnchorsData: []};
+    for(const [id, controller] of this.anchor_controllers_) {
+      frameData.anchorsData.allAnchorsIds.push(id);
+
+      // Send the entire anchor data over if there was a change since last GetFrameData().
+      if(controller.dirty) {
+        const anchorData = {id};
+        if(!controller.paused) {
+          anchorData.mojoFromAnchor = getPoseFromTransform(
+              XRMathHelper.decomposeRigidTransform(
+                  controller._getAnchorOrigin()));
+        }
+
+        controller._markProcessed();
+
+        frameData.anchorsData.updatedAnchorsData.push(anchorData);
+      }
+    }
+  }
+
+  // Private functions - depth sensing implementation:
+
+  // Modifies passed in frameData to add anchor information.
+  _calculateDepthInformation(frameData) {
+    if (!this.supportedModes_.includes(vrMojom.XRSessionMode.kImmersiveAr)) {
+      return;
+    }
+
+    if (!this.enabledFeatures_.includes(vrMojom.XRSessionFeature.DEPTH)) {
+      return;
+    }
+
+    // If we don't have a current depth data, we'll return null
+    // (i.e. no data is not a valid data, so it cannot be "StillValid").
+    if (this.depthSensingData_ == null) {
+      frameData.depthData = null;
+      return;
+    }
+
+    if(!this.depthSensingDataDirty_) {
+      frameData.depthData = { dataStillValid: {}};
+      return;
+    }
+
+    frameData.depthData = {
+      updatedDepthData: {
+        timeDelta: frameData.timeDelta,
+        normTextureFromNormView: this.depthSensingData_.normDepthBufferFromNormView,
+        rawValueToMeters: this.depthSensingData_.rawValueToMeters,
+        size: { width: this.depthSensingData_.width, height: this.depthSensingData_.height },
+        pixelData: { bytes: this.depthSensingData_.depthData }
+      }
+    };
+
+    this.depthSensingDataDirty_ = false;
+  }
+
+  // Private functions - hit test implementation:
+
+  // Returns a Promise<bool> that signifies whether hit test source creation should succeed.
+  // If we have a hit test source creation callback installed, invoke it and return its result.
+  // If it's not installed, for back-compat just return a promise that resolves to true.
+  _shouldHitTestSourceCreationSucceed(hitTestParameters, controller) {
+    if(this.hit_test_source_creation_callback_) {
+      return this.hit_test_source_creation_callback_(hitTestParameters, controller);
+    } else {
+      return Promise.resolve(true);
+    }
+  }
+
+  // Modifies passed in frameData to add hit test results.
+  _calculateHitTestResults(frameData) {
+    if (!this.supportedModes_.includes(vrMojom.XRSessionMode.kImmersiveAr)) {
+      return;
+    }
+
+    frameData.hitTestSubscriptionResults = {results: [],
+                                            transientInputResults: []};
+    if (!this.world_) {
+      return;
+    }
+
+    // Non-transient hit test:
+    for (const [id, subscription] of this.hitTestSubscriptions_) {
+      const mojo_from_native_origin = this._getMojoFromNativeOrigin(subscription.nativeOriginInformation);
+      if (!mojo_from_native_origin) continue;
+
+      const [mojo_ray_origin, mojo_ray_direction] = this._transformRayToMojoSpace(
+        subscription.ray,
+        mojo_from_native_origin
+      );
+
+      const results = this._hitTestWorld(mojo_ray_origin, mojo_ray_direction, subscription.entityTypes);
+      frameData.hitTestSubscriptionResults.results.push(
+          {subscriptionId: id, hitTestResults: results});
+    }
+
+    // Transient hit test:
+    const mojo_from_viewer = this._getMojoFromViewer();
+
+    for (const [id, subscription] of this.transientHitTestSubscriptions_) {
+      const result = {subscriptionId: id,
+                      inputSourceIdToHitTestResults: new Map()};
+
+      // Find all input sources that match the profile name:
+      const matching_input_sources = Array.from(this.input_sources_.values())
+                                                        .filter(input_source => input_source.profiles_.includes(subscription.profileName));
+
+      for (const input_source of matching_input_sources) {
+        const mojo_from_native_origin = input_source._getMojoFromInputSource(mojo_from_viewer);
+
+        const [mojo_ray_origin, mojo_ray_direction] = this._transformRayToMojoSpace(
+          subscription.ray,
+          mojo_from_native_origin
+        );
+
+        const results = this._hitTestWorld(mojo_ray_origin, mojo_ray_direction, subscription.entityTypes);
+
+        result.inputSourceIdToHitTestResults.set(input_source.source_id_, results);
+      }
+
+      frameData.hitTestSubscriptionResults.transientInputResults.push(result);
+    }
+  }
+
+  // Returns 2-element array [origin, direction] of a ray in mojo space.
+  // |ray| is expressed relative to native origin.
+  _transformRayToMojoSpace(ray, mojo_from_native_origin) {
+    const ray_origin = {
+      x: ray.origin.x,
+      y: ray.origin.y,
+      z: ray.origin.z,
+      w: 1
+    };
+    const ray_direction = {
+      x: ray.direction.x,
+      y: ray.direction.y,
+      z: ray.direction.z,
+      w: 0
+    };
+
+    const mojo_ray_origin = XRMathHelper.transform_by_matrix(
+      mojo_from_native_origin,
+      ray_origin);
+    const mojo_ray_direction = XRMathHelper.transform_by_matrix(
+      mojo_from_native_origin,
+      ray_direction);
+
+    return [mojo_ray_origin, mojo_ray_direction];
+  }
+
+  // Hit tests the passed in ray (expressed as origin and direction) against the mocked world data.
+  _hitTestWorld(origin, direction, entityTypes) {
+    let result = [];
+
+    for (const region of this.world_.hitTestRegions) {
+      const partial_result = this._hitTestRegion(
+        region,
+        origin, direction,
+        entityTypes);
+
+      result = result.concat(partial_result);
+    }
+
+    return result.sort((lhs, rhs) => lhs.distance - rhs.distance).map((hitTest) => {
+      delete hitTest.distance;
+      return hitTest;
+    });
+  }
+
+  // Hit tests the passed in ray (expressed as origin and direction) against world region.
+  // |entityTypes| is a set of FakeXRRegionTypes.
+  // |region| is FakeXRRegion.
+  // Returns array of XRHitResults, each entry will be decorated with the distance from the ray origin (along the ray).
+  _hitTestRegion(region, origin, direction, entityTypes) {
+    const regionNameToMojoEnum = {
+      "point": vrMojom.EntityTypeForHitTest.POINT,
+      "plane": vrMojom.EntityTypeForHitTest.PLANE,
+      "mesh":null
+    };
+
+    if (!entityTypes.includes(regionNameToMojoEnum[region.type])) {
+      return [];
+    }
+
+    const result = [];
+    for (const face of region.faces) {
+      const maybe_hit = this._hitTestFace(face, origin, direction);
+      if (maybe_hit) {
+        result.push(maybe_hit);
+      }
+    }
+
+    // The results should be sorted by distance and there should be no 2 entries with
+    // the same distance from ray origin - that would mean they are the same point.
+    // This situation is possible when a ray intersects the region through an edge shared
+    // by 2 faces.
+    return result.sort((lhs, rhs) => lhs.distance - rhs.distance)
+                 .filter((val, index, array) => index === 0 || val.distance !== array[index - 1].distance);
+  }
+
+  // Hit tests the passed in ray (expressed as origin and direction) against a single face.
+  // |face|, |origin|, and |direction| are specified in world (aka mojo) coordinates.
+  // |face| is an array of DOMPointInits.
+  // Returns null if the face does not intersect with the ray, otherwise the result is
+  // an XRHitResult with matrix describing the pose of the intersection point.
+  _hitTestFace(face, origin, direction) {
+    const add = XRMathHelper.add;
+    const sub = XRMathHelper.sub;
+    const mul = XRMathHelper.mul;
+    const normalize = XRMathHelper.normalize;
+    const dot = XRMathHelper.dot;
+    const cross = XRMathHelper.cross;
+    const neg = XRMathHelper.neg;
+
+    //1. Calculate plane normal in world coordinates.
+    const point_A = face.vertices[0];
+    const point_B = face.vertices[1];
+    const point_C = face.vertices[2];
+
+    const edge_AB = sub(point_B, point_A);
+    const edge_AC = sub(point_C, point_A);
+
+    const normal = normalize(cross(edge_AB, edge_AC));
+
+    const numerator = dot(sub(point_A, origin), normal);
+    const denominator = dot(direction, normal);
+
+    if (Math.abs(denominator) < XRMathHelper.EPSILON) {
+      // Planes are nearly parallel - there's either infinitely many intersection points or 0.
+      // Both cases signify a "no hit" for us.
+      return null;
+    } else {
+      // Single intersection point between the infinite plane and the line (*not* ray).
+      // Need to calculate the hit test matrix taking into account the face vertices.
+      const distance = numerator / denominator;
+      if (distance < 0) {
+        // Line - plane intersection exists, but not the half-line - plane does not.
+        return null;
+      } else {
+        const intersection_point = add(origin, mul(distance, direction));
+        // Since we are treating the face as a solid, flip the normal so that its
+        // half-space will contain the ray origin.
+        const y_axis = denominator > 0 ? neg(normal) : normal;
+
+        let z_axis = null;
+        const cos_direction_and_y_axis = dot(direction, y_axis);
+        if (Math.abs(cos_direction_and_y_axis) > (1 - XRMathHelper.EPSILON)) {
+          // Ray and the hit test normal are co-linear - try using the 'up' or 'right' vector's projection on the face plane as the Z axis.
+          // Note: this edge case is currently not covered by the spec.
+          const up = {x: 0.0, y: 1.0, z: 0.0, w: 0.0};
+          const right = {x: 1.0, y: 0.0, z: 0.0, w: 0.0};
+
+          z_axis = Math.abs(dot(up, y_axis)) > (1 - XRMathHelper.EPSILON)
+                        ? sub(up, mul(dot(right, y_axis), y_axis))  // `up is also co-linear with hit test normal, use `right`
+                        : sub(up, mul(dot(up, y_axis), y_axis));    // `up` is not co-linear with hit test normal, use it
+        } else {
+          // Project the ray direction onto the plane, negate it and use as a Z axis.
+          z_axis = neg(sub(direction, mul(cos_direction_and_y_axis, y_axis))); // Z should point towards the ray origin, not away.
+        }
+
+        z_axis = normalize(z_axis);
+        const x_axis = normalize(cross(y_axis, z_axis));
+
+        // Filter out the points not in polygon.
+        if (!XRMathHelper.pointInFace(intersection_point, face)) {
+          return null;
+        }
+
+        const hitResult = {planeId: 0n};
+        hitResult.distance = distance;  // Extend the object with additional information used by higher layers.
+                                        // It will not be serialized over mojom.
+
+        const matrix = new Array(16);
+
+        matrix[0] = x_axis.x;
+        matrix[1] = x_axis.y;
+        matrix[2] = x_axis.z;
+        matrix[3] = 0;
+
+        matrix[4] = y_axis.x;
+        matrix[5] = y_axis.y;
+        matrix[6] = y_axis.z;
+        matrix[7] = 0;
+
+        matrix[8] = z_axis.x;
+        matrix[9] = z_axis.y;
+        matrix[10] = z_axis.z;
+        matrix[11] = 0;
+
+        matrix[12] = intersection_point.x;
+        matrix[13] = intersection_point.y;
+        matrix[14] = intersection_point.z;
+        matrix[15] = 1;
+
+        hitResult.mojoFromResult = getPoseFromTransform(
+            XRMathHelper.decomposeRigidTransform(matrix));
+        return hitResult;
+      }
+    }
+  }
+
+  _getMojoFromViewer() {
+    if (!this.pose_) {
+      return XRMathHelper.identity();
+    }
+    const transform = {
+      position: [
+        this.pose_.position.x,
+        this.pose_.position.y,
+        this.pose_.position.z],
+      orientation: [
+        this.pose_.orientation.x,
+        this.pose_.orientation.y,
+        this.pose_.orientation.z,
+        this.pose_.orientation.w],
+    };
+
+    return getMatrixFromTransform(transform);
+  }
+
+  _getMojoFromViewerWithOffset(viewOffset) {
+    return { matrix: XRMathHelper.mul4x4(this._getMojoFromViewer(), viewOffset.matrix) };
+  }
+
+  _getMojoFromNativeOrigin(nativeOriginInformation) {
+    const mojo_from_viewer = this._getMojoFromViewer();
+
+    if (nativeOriginInformation.inputSourceSpaceInfo !== undefined) {
+      if (!this.input_sources_.has(nativeOriginInformation.inputSourceSpaceInfo.inputSourceId)) {
+        return null;
+      } else {
+        const inputSource = this.input_sources_.get(nativeOriginInformation.inputSourceSpaceInfo.inputSourceId);
+        return inputSource._getMojoFromInputSource(mojo_from_viewer);
+      }
+    } else if (nativeOriginInformation.referenceSpaceType !== undefined) {
+      switch (nativeOriginInformation.referenceSpaceType) {
+        case vrMojom.XRReferenceSpaceType.kLocal:
+          return XRMathHelper.identity();
+        case vrMojom.XRReferenceSpaceType.kLocalFloor:
+          if (this.stageParameters_ == null || this.stageParameters_.mojoFromFloor == null) {
+            console.warn("Standing transform not available.");
+            return null;
+          }
+          return this.stageParameters_.mojoFromFloor.matrix;
+        case vrMojom.XRReferenceSpaceType.kViewer:
+          return mojo_from_viewer;
+        case vrMojom.XRReferenceSpaceType.kBoundedFloor:
+          return null;
+        case vrMojom.XRReferenceSpaceType.kUnbounded:
+          return null;
+        default:
+          throw new TypeError("Unrecognized XRReferenceSpaceType!");
+      }
+    } else {
+      // Anchors & planes are not yet supported for hit test.
+      return null;
+    }
+  }
+}
+
+class MockXRInputSource {
+  constructor(fakeInputSourceInit, id, pairedDevice) {
+    this.source_id_ = id;
+    this.pairedDevice_ = pairedDevice;
+    this.handedness_ = fakeInputSourceInit.handedness;
+    this.target_ray_mode_ = fakeInputSourceInit.targetRayMode;
+
+    if (fakeInputSourceInit.pointerOrigin == null) {
+      throw new TypeError("FakeXRInputSourceInit.pointerOrigin is required.");
+    }
+
+    this.setPointerOrigin(fakeInputSourceInit.pointerOrigin);
+    this.setProfiles(fakeInputSourceInit.profiles);
+
+    this.primary_input_pressed_ = false;
+    if (fakeInputSourceInit.selectionStarted != null) {
+      this.primary_input_pressed_ = fakeInputSourceInit.selectionStarted;
+    }
+
+    this.primary_input_clicked_ = false;
+    if (fakeInputSourceInit.selectionClicked != null) {
+      this.primary_input_clicked_ = fakeInputSourceInit.selectionClicked;
+    }
+
+    this.primary_squeeze_pressed_ = false;
+    this.primary_squeeze_clicked_ = false;
+
+    this.mojo_from_input_ = null;
+    if (fakeInputSourceInit.gripOrigin != null) {
+      this.setGripOrigin(fakeInputSourceInit.gripOrigin);
+    }
+
+    // This properly handles if supportedButtons were not specified.
+    this.setSupportedButtons(fakeInputSourceInit.supportedButtons);
+
+    this.emulated_position_ = false;
+    this.desc_dirty_ = true;
+  }
+
+  // WebXR Test API
+  setHandedness(handedness) {
+    if (this.handedness_ != handedness) {
+      this.desc_dirty_ = true;
+      this.handedness_ = handedness;
+    }
+  }
+
+  setTargetRayMode(targetRayMode) {
+    if (this.target_ray_mode_ != targetRayMode) {
+      this.desc_dirty_ = true;
+      this.target_ray_mode_ = targetRayMode;
+    }
+  }
+
+  setProfiles(profiles) {
+    this.desc_dirty_ = true;
+    this.profiles_ = profiles;
+  }
+
+  setGripOrigin(transform, emulatedPosition = false) {
+    // grip_origin was renamed to mojo_from_input in mojo
+    this.mojo_from_input_ = composeGFXTransform(transform);
+    this.emulated_position_ = emulatedPosition;
+
+    // Technically, setting the grip shouldn't make the description dirty, but
+    // the webxr-test-api sets our pointer as mojoFromPointer; however, we only
+    // support it across mojom as inputFromPointer, so we need to recalculate it
+    // whenever the grip moves.
+    this.desc_dirty_ = true;
+  }
+
+  clearGripOrigin() {
+    // grip_origin was renamed to mojo_from_input in mojo
+    if (this.mojo_from_input_ != null) {
+      this.mojo_from_input_ = null;
+      this.emulated_position_ = false;
+      this.desc_dirty_ = true;
+    }
+  }
+
+  setPointerOrigin(transform, emulatedPosition = false) {
+    // pointer_origin is mojo_from_pointer.
+    this.desc_dirty_ = true;
+    this.mojo_from_pointer_ = composeGFXTransform(transform);
+    this.emulated_position_ = emulatedPosition;
+  }
+
+  disconnect() {
+    this.pairedDevice_._removeInputSource(this);
+  }
+
+  reconnect() {
+    this.pairedDevice_._addInputSource(this);
+  }
+
+  startSelection() {
+    this.primary_input_pressed_ = true;
+    if (this.gamepad_) {
+      this.gamepad_.buttons[0].pressed = true;
+      this.gamepad_.buttons[0].touched = true;
+    }
+  }
+
+  endSelection() {
+    if (!this.primary_input_pressed_) {
+      throw new Error("Attempted to end selection which was not started");
+    }
+
+    this.primary_input_pressed_ = false;
+    this.primary_input_clicked_ = true;
+
+    if (this.gamepad_) {
+      this.gamepad_.buttons[0].pressed = false;
+      this.gamepad_.buttons[0].touched = false;
+    }
+  }
+
+  simulateSelect() {
+    this.primary_input_clicked_ = true;
+  }
+
+  setSupportedButtons(supportedButtons) {
+    this.gamepad_ = null;
+    this.supported_buttons_ = [];
+
+    // If there are no supported buttons, we can stop now.
+    if (supportedButtons == null || supportedButtons.length < 1) {
+      return;
+    }
+
+    const supported_button_map = {};
+    this.gamepad_ = this._getEmptyGamepad();
+    for (let i = 0; i < supportedButtons.length; i++) {
+      const buttonType = supportedButtons[i].buttonType;
+      this.supported_buttons_.push(buttonType);
+      supported_button_map[buttonType] = supportedButtons[i];
+    }
+
+    // Let's start by building the button state in order of priority:
+    // Primary button is index 0.
+    this.gamepad_.buttons.push({
+      pressed: this.primary_input_pressed_,
+      touched: this.primary_input_pressed_,
+      value: this.primary_input_pressed_ ? 1.0 : 0.0
+    });
+
+    // Now add the rest of our buttons
+    this._addGamepadButton(supported_button_map['grip']);
+    this._addGamepadButton(supported_button_map['touchpad']);
+    this._addGamepadButton(supported_button_map['thumbstick']);
+    this._addGamepadButton(supported_button_map['optional-button']);
+    this._addGamepadButton(supported_button_map['optional-thumbstick']);
+
+    // Finally, back-fill placeholder buttons/axes
+    for (let i = 0; i < this.gamepad_.buttons.length; i++) {
+      if (this.gamepad_.buttons[i] == null) {
+        this.gamepad_.buttons[i] = {
+          pressed: false,
+          touched: false,
+          value: 0
+        };
+      }
+    }
+
+    for (let i=0; i < this.gamepad_.axes.length; i++) {
+      if (this.gamepad_.axes[i] == null) {
+        this.gamepad_.axes[i] = 0;
+      }
+    }
+  }
+
+  updateButtonState(buttonState) {
+    if (this.supported_buttons_.indexOf(buttonState.buttonType) == -1) {
+      throw new Error("Tried to update state on an unsupported button");
+    }
+
+    const buttonIndex = this._getButtonIndex(buttonState.buttonType);
+    const axesStartIndex = this._getAxesStartIndex(buttonState.buttonType);
+
+    if (buttonIndex == -1) {
+      throw new Error("Unknown Button Type!");
+    }
+
+    // is this a 'squeeze' button?
+    if (buttonIndex === this._getButtonIndex('grip')) {
+      // squeeze
+      if (buttonState.pressed) {
+        this.primary_squeeze_pressed_ = true;
+      } else if (this.gamepad_.buttons[buttonIndex].pressed) {
+        this.primary_squeeze_clicked_ = true;
+        this.primary_squeeze_pressed_ = false;
+      } else {
+        this.primary_squeeze_clicked_ = false;
+        this.primary_squeeze_pressed_ = false;
+      }
+    }
+
+    this.gamepad_.buttons[buttonIndex].pressed = buttonState.pressed;
+    this.gamepad_.buttons[buttonIndex].touched = buttonState.touched;
+    this.gamepad_.buttons[buttonIndex].value = buttonState.pressedValue;
+
+    if (axesStartIndex != -1) {
+      this.gamepad_.axes[axesStartIndex] = buttonState.xValue == null ? 0.0 : buttonState.xValue;
+      this.gamepad_.axes[axesStartIndex + 1] = buttonState.yValue == null ? 0.0 : buttonState.yValue;
+    }
+  }
+
+  // DOM Overlay Extensions
+  setOverlayPointerPosition(x, y) {
+    this.overlay_pointer_position_ = {x: x, y: y};
+  }
+
+  // Helpers for Mojom
+  _getInputSourceState() {
+    const input_state = {};
+
+    input_state.sourceId = this.source_id_;
+    input_state.isAuxiliary = false;
+
+    input_state.primaryInputPressed = this.primary_input_pressed_;
+    input_state.primaryInputClicked = this.primary_input_clicked_;
+
+    input_state.primarySqueezePressed = this.primary_squeeze_pressed_;
+    input_state.primarySqueezeClicked = this.primary_squeeze_clicked_;
+    // Setting the input source's "clicked" state should generate one "select"
+    // event. Reset the input value to prevent it from continuously generating
+    // events.
+    this.primary_input_clicked_ = false;
+    // Setting the input source's "clicked" state should generate one "squeeze"
+    // event. Reset the input value to prevent it from continuously generating
+    // events.
+    this.primary_squeeze_clicked_ = false;
+
+    input_state.mojoFromInput = this.mojo_from_input_;
+
+    input_state.gamepad = this.gamepad_;
+
+    input_state.emulatedPosition = this.emulated_position_;
+
+    if (this.desc_dirty_) {
+      const input_desc = {};
+
+      switch (this.target_ray_mode_) {
+        case 'gaze':
+          input_desc.targetRayMode = vrMojom.XRTargetRayMode.GAZING;
+          break;
+        case 'tracked-pointer':
+          input_desc.targetRayMode = vrMojom.XRTargetRayMode.POINTING;
+          break;
+        case 'screen':
+          input_desc.targetRayMode = vrMojom.XRTargetRayMode.TAPPING;
+          break;
+        default:
+          throw new Error('Unhandled target ray mode ' + this.target_ray_mode_);
+      }
+
+      switch (this.handedness_) {
+        case 'left':
+          input_desc.handedness = vrMojom.XRHandedness.LEFT;
+          break;
+        case 'right':
+          input_desc.handedness = vrMojom.XRHandedness.RIGHT;
+          break;
+        default:
+          input_desc.handedness = vrMojom.XRHandedness.NONE;
+          break;
+      }
+
+      // Mojo requires us to send the pointerOrigin as relative to the grip
+      // space. If we don't have a grip space, we'll just assume that there
+      // is a grip at identity. This allows tests to simulate controllers that
+      // are really just a pointer with no tracked grip, though we will end up
+      // exposing that grip space.
+      let mojo_from_input = XRMathHelper.identity();
+      switch (this.target_ray_mode_) {
+        case 'gaze':
+        case 'screen':
+          // For gaze and screen space, we won't have a mojo_from_input; however
+          // the "input" position is just the viewer, so use mojo_from_viewer.
+          mojo_from_input = this.pairedDevice_._getMojoFromViewer();
+          break;
+        case 'tracked-pointer':
+          // If we have a tracked grip position (e.g. mojo_from_input), then use
+          // that. If we don't, then we'll just set the pointer offset directly,
+          // using identity as set above.
+          if (this.mojo_from_input_) {
+            mojo_from_input = this.mojo_from_input_.matrix;
+          }
+          break;
+        default:
+          throw new Error('Unhandled target ray mode ' + this.target_ray_mode_);
+      }
+
+      // To convert mojo_from_pointer to input_from_pointer, we need:
+      // input_from_pointer = input_from_mojo * mojo_from_pointer
+      // Since we store mojo_from_input, we need to invert it here before
+      // multiplying.
+      let input_from_mojo = XRMathHelper.inverse(mojo_from_input);
+      input_desc.inputFromPointer = {};
+      input_desc.inputFromPointer.matrix =
+        XRMathHelper.mul4x4(input_from_mojo, this.mojo_from_pointer_.matrix);
+
+      input_desc.profiles = this.profiles_;
+
+      input_state.description = input_desc;
+
+      this.desc_dirty_ = false;
+    }
+
+    // Pointer data for DOM Overlay, set by setOverlayPointerPosition()
+    if (this.overlay_pointer_position_) {
+      input_state.overlayPointerPosition = this.overlay_pointer_position_;
+      this.overlay_pointer_position_ = null;
+    }
+
+    return input_state;
+  }
+
+  _getEmptyGamepad() {
+    // Mojo complains if some of the properties on Gamepad are null, so set
+    // everything to reasonable defaults that tests can override.
+    const gamepad = {
+      connected: true,
+      id: [],
+      timestamp: 0n,
+      axes: [],
+      buttons: [],
+      mapping: GamepadMapping.GamepadMappingStandard,
+      displayId: 0,
+    };
+
+    switch (this.handedness_) {
+      case 'left':
+      gamepad.hand = GamepadHand.GamepadHandLeft;
+      break;
+      case 'right':
+      gamepad.hand = GamepadHand.GamepadHandRight;
+      break;
+      default:
+      gamepad.hand = GamepadHand.GamepadHandNone;
+      break;
+    }
+
+    return gamepad;
+  }
+
+  _addGamepadButton(buttonState) {
+    if (buttonState == null) {
+      return;
+    }
+
+    const buttonIndex = this._getButtonIndex(buttonState.buttonType);
+    const axesStartIndex = this._getAxesStartIndex(buttonState.buttonType);
+
+    if (buttonIndex == -1) {
+      throw new Error("Unknown Button Type!");
+    }
+
+    this.gamepad_.buttons[buttonIndex] = {
+      pressed: buttonState.pressed,
+      touched: buttonState.touched,
+      value: buttonState.pressedValue
+    };
+
+    // Add x/y value if supported.
+    if (axesStartIndex != -1) {
+      this.gamepad_.axes[axesStartIndex] = (buttonState.xValue == null ? 0.0 : buttonSate.xValue);
+      this.gamepad_.axes[axesStartIndex + 1] = (buttonState.yValue == null ? 0.0 : buttonSate.yValue);
+    }
+  }
+
+  // General Helper methods
+  _getButtonIndex(buttonType) {
+    switch (buttonType) {
+      case 'grip':
+        return 1;
+      case 'touchpad':
+        return 2;
+      case 'thumbstick':
+        return 3;
+      case 'optional-button':
+        return 4;
+      case 'optional-thumbstick':
+        return 5;
+      default:
+        return -1;
+    }
+  }
+
+  _getAxesStartIndex(buttonType) {
+    switch (buttonType) {
+      case 'touchpad':
+        return 0;
+      case 'thumbstick':
+        return 2;
+      case 'optional-thumbstick':
+        return 4;
+      default:
+        return -1;
+    }
+  }
+
+  _getMojoFromInputSource(mojo_from_viewer) {
+    return this.mojo_from_pointer_.matrix;
+  }
+}
+
+// Mojo helper classes
+class FakeXRHitTestSourceController {
+  constructor(id) {
+    this.id_ = id;
+    this.deleted_ = false;
+  }
+
+  get deleted() {
+    return this.deleted_;
+  }
+
+  // Internal setter:
+  set deleted(value) {
+    this.deleted_ = value;
+  }
+}
+
+class MockXRPresentationProvider {
+  constructor() {
+    this.receiver_ = null;
+    this.submit_frame_count_ = 0;
+    this.missing_frame_count_ = 0;
+  }
+
+  _bindProvider() {
+    const provider = new vrMojom.XRPresentationProviderRemote();
+
+    if (this.receiver_) {
+      this.receiver_.$.close();
+    }
+    this.receiver_ = new vrMojom.XRPresentationProviderReceiver(this);
+    this.receiver_.$.bindHandle(provider.$.bindNewPipeAndPassReceiver().handle);
+    return provider;
+  }
+
+  _getClientReceiver() {
+    this.submitFrameClient_ = new vrMojom.XRPresentationClientRemote();
+    return this.submitFrameClient_.$.bindNewPipeAndPassReceiver();
+  }
+
+  // XRPresentationProvider mojo implementation
+  updateLayerBounds(frameId, leftBounds, rightBounds, sourceSize) {}
+
+  submitFrameMissing(frameId, mailboxHolder, timeWaited) {
+    this.missing_frame_count_++;
+  }
+
+  submitFrame(frameId, mailboxHolder, timeWaited) {
+    this.submit_frame_count_++;
+
+    // Trigger the submit completion callbacks here. WARNING: The
+    // Javascript-based mojo mocks are *not* re-entrant. It's OK to
+    // wait for these notifications on the next frame, but waiting
+    // within the current frame would never finish since the incoming
+    // calls would be queued until the current execution context finishes.
+    this.submitFrameClient_.onSubmitFrameTransferred(true);
+    this.submitFrameClient_.onSubmitFrameRendered();
+  }
+
+  submitFrameWithTextureHandle(frameId, texture, syncToken) {}
+
+  submitFrameDrawnIntoTexture(frameId, syncToken, timeWaited) {}
+
+  // Utility methods
+  _close() {
+    if (this.receiver_) {
+      this.receiver_.$.close();
+    }
+  }
+}
+
+// Export these into the global object as a side effect of importing this
+// module.
+self.ChromeXRTest = ChromeXRTest;
+self.MockRuntime = MockRuntime;
+self.MockVRService = MockVRService;
+self.SubscribeToHitTestResult = vrMojom.SubscribeToHitTestResult;
+
+navigator.xr.test = new ChromeXRTest();
diff --git a/test/wpt/tests/resources/chromium/webxr-test.js.headers b/test/wpt/tests/resources/chromium/webxr-test.js.headers
new file mode 100644
index 00000000000..6805c323df5
--- /dev/null
+++ b/test/wpt/tests/resources/chromium/webxr-test.js.headers
@@ -0,0 +1 @@
+Content-Type: text/javascript; charset=utf-8
diff --git a/test/wpt/tests/resources/declarative-shadow-dom-polyfill.js b/test/wpt/tests/resources/declarative-shadow-dom-polyfill.js
new file mode 100644
index 00000000000..dfb0a1e053c
--- /dev/null
+++ b/test/wpt/tests/resources/declarative-shadow-dom-polyfill.js
@@ -0,0 +1,16 @@
+/*
+ * Polyfill for attaching shadow trees for declarative Shadow DOM for implementations that do not support
+ * declarative Shadow DOM.
+ *
+ * root: The root of the subtree to perform the attachments in
+ */
+
+function polyfill_declarative_shadow_dom(root) {
+  root.querySelectorAll("template[shadowroot]").forEach(template => {
+    const mode = template.getAttribute("shadowroot");
+    const shadowRoot = template.parentNode.attachShadow({ mode });
+    shadowRoot.appendChild(template.content);
+    template.remove();
+    polyfill_declarative_shadow_dom(shadowRoot);
+  });
+}
diff --git a/test/wpt/tests/resources/idlharness-shadowrealm.js b/test/wpt/tests/resources/idlharness-shadowrealm.js
new file mode 100644
index 00000000000..9484ca6f512
--- /dev/null
+++ b/test/wpt/tests/resources/idlharness-shadowrealm.js
@@ -0,0 +1,61 @@
+// TODO: it would be nice to support `idl_array.add_objects`
+function fetch_text(url) {
+    return fetch(url).then(function (r) {
+        if (!r.ok) {
+            throw new Error("Error fetching " + url + ".");
+        }
+        return r.text();
+    });
+}
+
+/**
+ * idl_test_shadowrealm is a promise_test wrapper that handles the fetching of the IDL, and
+ * running the code in a `ShadowRealm`, avoiding repetitive boilerplate.
+ *
+ * @see https://github.com/tc39/proposal-shadowrealm
+ * @param {String[]} srcs Spec name(s) for source idl files (fetched from
+ *      /interfaces/{name}.idl).
+ * @param {String[]} deps Spec name(s) for dependency idl files (fetched
+ *      from /interfaces/{name}.idl). Order is important - dependencies from
+ *      each source will only be included if they're already know to be a
+ *      dependency (i.e. have already been seen).
+ */
+function idl_test_shadowrealm(srcs, deps) {
+    promise_setup(async t => {
+        const realm = new ShadowRealm();
+        // https://github.com/web-platform-tests/wpt/issues/31996
+        realm.evaluate("globalThis.self = globalThis; undefined;");
+
+        realm.evaluate(`
+            globalThis.self.GLOBAL = {
+                isWindow: function() { return false; },
+                isWorker: function() { return false; },
+                isShadowRealm: function() { return true; },
+            }; undefined;
+        `);
+        const specs = await Promise.all(srcs.concat(deps).map(spec => {
+            return fetch_text("/interfaces/" + spec + ".idl");
+        }));
+        const idls = JSON.stringify(specs);
+        await new Promise(
+            realm.evaluate(`(resolve,reject) => {
+                (async () => {
+                    await import("/resources/testharness.js");
+                    await import("/resources/WebIDLParser.js");
+                    await import("/resources/idlharness.js");
+                    const idls = ${idls};
+                    const idl_array = new IdlArray();
+                    for (let i = 0; i < ${srcs.length}; i++) {
+                        idl_array.add_idls(idls[i]);
+                    }
+                    for (let i = ${srcs.length}; i < ${srcs.length + deps.length}; i++) {
+                        idl_array.add_dependency_idls(idls[i]);
+                    }
+                    idl_array.test();
+                })().then(resolve, (e) => reject(e.toString()));
+            }`)
+        );
+        await fetch_tests_from_shadow_realm(realm);
+    });
+}
+// vim: set expandtab shiftwidth=4 tabstop=4 foldmarker=@{,@} foldmethod=marker:
diff --git a/test/wpt/tests/resources/idlharness.js b/test/wpt/tests/resources/idlharness.js
index d2fb0366c80..46aa11e5ca1 100644
--- a/test/wpt/tests/resources/idlharness.js
+++ b/test/wpt/tests/resources/idlharness.js
@@ -2433,44 +2433,6 @@ IdlInterface.prototype.test_to_json_operation = function(desc, memberHolderObjec
     }
 };
 
-IdlInterface.prototype.test_member_iterable = function(member)
-{
-    subsetTestByKey(this.name, test, function()
-    {
-        var isPairIterator = member.idlType.length === 2;
-        var proto = this.get_interface_object().prototype;
-        var iteratorDesc = Object.getOwnPropertyDescriptor(proto, Symbol.iterator);
-
-        assert_true(iteratorDesc.writable, "@@iterator property should be writable");
-        assert_true(iteratorDesc.configurable, "@@iterator property should be configurable");
-        assert_false(iteratorDesc.enumerable, "@@iterator property should not be enumerable");
-        assert_equals(typeof iteratorDesc.value, "function", "@@iterator property should be a function");
-        assert_equals(iteratorDesc.value.length, 0, "@@iterator function object length should be 0");
-        assert_equals(iteratorDesc.value.name, isPairIterator ? "entries" : "values", "@@iterator function object should have the right name");
-
-        if (isPairIterator) {
-            assert_equals(proto["entries"], proto[Symbol.iterator], "entries method should be the same as @@iterator method");
-            [
-                ["entries", 0],
-                ["keys", 0],
-                ["values", 0],
-                ["forEach", 1]
-            ].forEach(([property, length]) => {
-                var desc = Object.getOwnPropertyDescriptor(proto, property);
-                assert_equals(typeof desc.value, "function", property + " property should be a function");
-                assert_equals(desc.value.length, length, property + " function object should have the right length");
-                assert_equals(desc.value.name, property, property + " function object should have the right name");
-            });
-        } else {
-            assert_equals(proto[Symbol.iterator], Array.prototype[Symbol.iterator], "@@iterator method should be the same as Array prototype's");
-            ["entries", "keys", "values", "forEach", Symbol.iterator].forEach(property => {
-                var propertyName = property === Symbol.iterator ? "@@iterator" : property;
-                assert_equals(proto[property], Array.prototype[property], propertyName + " method should be the same as Array prototype's");
-            });
-        }
-    }.bind(this), this.name + " interface: iterable<" + member.idlType.map(function(t) { return t.idlType; }).join(", ") + ">");
-};
-
 IdlInterface.prototype.test_member_maplike = function(member) {
     subsetTestByKey(this.name, test, () => {
         const proto = this.get_interface_object().prototype;
@@ -2487,14 +2449,14 @@ IdlInterface.prototype.test_member_maplike = function(member) {
             methods.push(
                 ["set", 2],
                 ["delete", 1],
-                ["clear", 1]
+                ["clear", 0]
             );
         }
 
         for (const [name, length] of methods) {
             const desc = Object.getOwnPropertyDescriptor(proto, name);
             assert_equals(typeof desc.value, "function", `${name} should be a function`);
-            assert_equals(desc.enumerable, false, `${name} enumerable`);
+            assert_equals(desc.enumerable, true, `${name} enumerable`);
             assert_equals(desc.configurable, true, `${name} configurable`);
             assert_equals(desc.writable, true, `${name} writable`);
             assert_equals(desc.value.length, length, `${name} function object length should be ${length}`);
@@ -2510,10 +2472,10 @@ IdlInterface.prototype.test_member_maplike = function(member) {
         const sizeDesc = Object.getOwnPropertyDescriptor(proto, "size");
         assert_equals(typeof sizeDesc.get, "function", `size getter should be a function`);
         assert_equals(sizeDesc.set, undefined, `size should not have a setter`);
-        assert_equals(sizeDesc.enumerable, false, `size enumerable`);
+        assert_equals(sizeDesc.enumerable, true, `size enumerable`);
         assert_equals(sizeDesc.configurable, true, `size configurable`);
-        assert_equals(sizeDesc.get.length, 0, `size getter length should have the right length`);
-        assert_equals(sizeDesc.get.name, "get size", `size getter have the right name`);
+        assert_equals(sizeDesc.get.length, 0, `size getter length`);
+        assert_equals(sizeDesc.get.name, "get size", `size getter name`);
     }, `${this.name} interface: maplike<${member.idlType.map(t => t.idlType).join(", ")}>`);
 };
 
@@ -2532,14 +2494,14 @@ IdlInterface.prototype.test_member_setlike = function(member) {
             methods.push(
                 ["add", 1],
                 ["delete", 1],
-                ["clear", 1]
+                ["clear", 0]
             );
         }
 
         for (const [name, length] of methods) {
             const desc = Object.getOwnPropertyDescriptor(proto, name);
             assert_equals(typeof desc.value, "function", `${name} should be a function`);
-            assert_equals(desc.enumerable, false, `${name} enumerable`);
+            assert_equals(desc.enumerable, true, `${name} enumerable`);
             assert_equals(desc.configurable, true, `${name} configurable`);
             assert_equals(desc.writable, true, `${name} writable`);
             assert_equals(desc.value.length, length, `${name} function object length should be ${length}`);
@@ -2555,42 +2517,92 @@ IdlInterface.prototype.test_member_setlike = function(member) {
         const sizeDesc = Object.getOwnPropertyDescriptor(proto, "size");
         assert_equals(typeof sizeDesc.get, "function", `size getter should be a function`);
         assert_equals(sizeDesc.set, undefined, `size should not have a setter`);
-        assert_equals(sizeDesc.enumerable, false, `size enumerable`);
+        assert_equals(sizeDesc.enumerable, true, `size enumerable`);
         assert_equals(sizeDesc.configurable, true, `size configurable`);
-        assert_equals(sizeDesc.get.length, 0, `size getter length should have the right length`);
-        assert_equals(sizeDesc.get.name, "size", `size getter have the right name`);
+        assert_equals(sizeDesc.get.length, 0, `size getter length`);
+        assert_equals(sizeDesc.get.name, "get size", `size getter name`);
     }, `${this.name} interface: setlike<${member.idlType.map(t => t.idlType).join(", ")}>`);
 };
 
-IdlInterface.prototype.test_member_async_iterable = function(member)
-{
-    subsetTestByKey(this.name, test, function()
-    {
-        var isPairIterator = member.idlType.length === 2;
-        var proto = this.get_interface_object().prototype;
-        var iteratorDesc = Object.getOwnPropertyDescriptor(proto, Symbol.asyncIterator);
+IdlInterface.prototype.test_member_iterable = function(member) {
+    subsetTestByKey(this.name, test, () => {
+        const isPairIterator = member.idlType.length === 2;
+        const proto = this.get_interface_object().prototype;
 
-        assert_true(iteratorDesc.writable, "@@asyncIterator property should be writable");
-        assert_true(iteratorDesc.configurable, "@@asyncIterator property should be configurable");
-        assert_false(iteratorDesc.enumerable, "@@asyncIterator property should not be enumerable");
-        assert_equals(typeof iteratorDesc.value, "function", "@@asyncIterator property should be a function");
-        assert_equals(iteratorDesc.value.length, 0, "@@asyncIterator function object length should be 0");
-        assert_equals(iteratorDesc.value.name, isPairIterator ? "entries" : "values", "@@asyncIterator function object should have the right name");
+        const methods = [
+            ["entries", 0],
+            ["keys", 0],
+            ["values", 0],
+            ["forEach", 1]
+        ];
+
+        for (const [name, length] of methods) {
+            const desc = Object.getOwnPropertyDescriptor(proto, name);
+            assert_equals(typeof desc.value, "function", `${name} should be a function`);
+            assert_equals(desc.enumerable, true, `${name} enumerable`);
+            assert_equals(desc.configurable, true, `${name} configurable`);
+            assert_equals(desc.writable, true, `${name} writable`);
+            assert_equals(desc.value.length, length, `${name} function object length should be ${length}`);
+            assert_equals(desc.value.name, name, `${name} function object should have the right name`);
+
+            if (!isPairIterator) {
+                assert_equals(desc.value, Array.prototype[name], `${name} equality with Array.prototype version`);
+            }
+        }
+
+        const iteratorDesc = Object.getOwnPropertyDescriptor(proto, Symbol.iterator);
+        assert_equals(iteratorDesc.enumerable, false, `@@iterator enumerable`);
+        assert_equals(iteratorDesc.configurable, true, `@@iterator configurable`);
+        assert_equals(iteratorDesc.writable, true, `@@iterator writable`);
 
         if (isPairIterator) {
-            assert_equals(proto["entries"], proto[Symbol.asyncIterator], "entries method should be the same as @@asyncIterator method");
-            ["entries", "keys", "values"].forEach(property => {
-                var desc = Object.getOwnPropertyDescriptor(proto, property);
-                assert_equals(typeof desc.value, "function", property + " property should be a function");
-                assert_equals(desc.value.length, 0, property + " function object length should be 0");
-                assert_equals(desc.value.name, property, property + " function object should have the right name");
-            });
+            assert_equals(iteratorDesc.value, proto.entries, `@@iterator equality with entries`);
         } else {
-            assert_equals(proto["values"], proto[Symbol.asyncIterator], "values method should be the same as @@asyncIterator method");
-            assert_false("entries" in proto, "should not have an entries method");
-            assert_false("keys" in proto, "should not have a keys method");
+            assert_equals(iteratorDesc.value, Array.prototype[Symbol.iterator], `@@iterator equality with Array.prototype version`);
         }
-    }.bind(this), this.name + " interface: async iterable<" + member.idlType.map(function(t) { return t.idlType; }).join(", ") + ">");
+    }, `${this.name} interface: iterable<${member.idlType.map(t => t.idlType).join(", ")}>`);
+};
+
+IdlInterface.prototype.test_member_async_iterable = function(member) {
+    subsetTestByKey(this.name, test, () => {
+        const isPairIterator = member.idlType.length === 2;
+        const proto = this.get_interface_object().prototype;
+
+        // Note that although the spec allows arguments, which will be passed to the @@asyncIterator
+        // method (which is either values or entries), those arguments must always be optional. So
+        // length of 0 is still correct for values and entries.
+        const methods = [
+            ["values", 0],
+        ];
+
+        if (isPairIterator) {
+            methods.push(
+                ["entries", 0],
+                ["keys", 0]
+            );
+        }
+
+        for (const [name, length] of methods) {
+            const desc = Object.getOwnPropertyDescriptor(proto, name);
+            assert_equals(typeof desc.value, "function", `${name} should be a function`);
+            assert_equals(desc.enumerable, true, `${name} enumerable`);
+            assert_equals(desc.configurable, true, `${name} configurable`);
+            assert_equals(desc.writable, true, `${name} writable`);
+            assert_equals(desc.value.length, length, `${name} function object length should be ${length}`);
+            assert_equals(desc.value.name, name, `${name} function object should have the right name`);
+        }
+
+        const iteratorDesc = Object.getOwnPropertyDescriptor(proto, Symbol.asyncIterator);
+        assert_equals(iteratorDesc.enumerable, false, `@@iterator enumerable`);
+        assert_equals(iteratorDesc.configurable, true, `@@iterator configurable`);
+        assert_equals(iteratorDesc.writable, true, `@@iterator writable`);
+
+        if (isPairIterator) {
+            assert_equals(iteratorDesc.value, proto.entries, `@@iterator equality with entries`);
+        } else {
+            assert_equals(iteratorDesc.value, proto.values, `@@iterator equality with values`);
+        }
+    }, `${this.name} interface: async iterable<${member.idlType.map(t => t.idlType).join(", ")}>`);
 };
 
 IdlInterface.prototype.test_member_stringifier = function(member)
@@ -2656,6 +2668,7 @@ IdlInterface.prototype.test_member_stringifier = function(member)
 
 IdlInterface.prototype.test_members = function()
 {
+    var unexposed_members = new Set();
     for (var i = 0; i < this.members.length; i++)
     {
         var member = this.members[i];
@@ -2664,15 +2677,18 @@ IdlInterface.prototype.test_members = function()
         }
 
         if (!exposed_in(exposure_set(member, this.exposureSet))) {
-            subsetTestByKey(this.name, test, function() {
-                // It's not exposed, so we shouldn't find it anywhere.
-                assert_false(member.name in this.get_interface_object(),
-                             "The interface object must not have a property " +
-                             format_value(member.name));
-                assert_false(member.name in this.get_interface_object().prototype,
-                             "The prototype object must not have a property " +
-                             format_value(member.name));
-            }.bind(this), this.name + " interface: member " + member.name);
+            if (!unexposed_members.has(member.name)) {
+                unexposed_members.add(member.name);
+                subsetTestByKey(this.name, test, function() {
+                    // It's not exposed, so we shouldn't find it anywhere.
+                    assert_false(member.name in this.get_interface_object(),
+                                "The interface object must not have a property " +
+                                format_value(member.name));
+                    assert_false(member.name in this.get_interface_object().prototype,
+                                "The prototype object must not have a property " +
+                                format_value(member.name));
+                }.bind(this), this.name + " interface: member " + member.name);
+            }
             continue;
         }
 
@@ -2751,21 +2767,26 @@ IdlInterface.prototype.test_object = function(desc)
         expected_typeof = "object";
     }
 
-    this.test_primary_interface_of(desc, obj, exception, expected_typeof);
+    if (this.is_callback()) {
+        assert_equals(exception, null, "Unexpected exception when evaluating object");
+        assert_equals(typeof obj, expected_typeof, "wrong typeof object");
+    } else {
+        this.test_primary_interface_of(desc, obj, exception, expected_typeof);
 
-    var current_interface = this;
-    while (current_interface)
-    {
-        if (!(current_interface.name in this.array.members))
+        var current_interface = this;
+        while (current_interface)
         {
-            throw new IdlHarnessError("Interface " + current_interface.name + " not found (inherited by " + this.name + ")");
-        }
-        if (current_interface.prevent_multiple_testing && current_interface.already_tested)
-        {
-            return;
+            if (!(current_interface.name in this.array.members))
+            {
+                throw new IdlHarnessError("Interface " + current_interface.name + " not found (inherited by " + this.name + ")");
+            }
+            if (current_interface.prevent_multiple_testing && current_interface.already_tested)
+            {
+                return;
+            }
+            current_interface.test_interface_of(desc, obj, exception, expected_typeof);
+            current_interface = this.array.members[current_interface.base];
         }
-        current_interface.test_interface_of(desc, obj, exception, expected_typeof);
-        current_interface = this.array.members[current_interface.base];
     }
 };
 
@@ -2838,17 +2859,23 @@ IdlInterface.prototype.test_interface_of = function(desc, obj, exception, expect
         return;
     }
 
+    var unexposed_properties = new Set();
     for (var i = 0; i < this.members.length; i++)
     {
         var member = this.members[i];
         if (member.untested) {
             continue;
         }
-        if (!exposed_in(exposure_set(member, this.exposureSet))) {
-            subsetTestByKey(this.name, test, function() {
-                assert_equals(exception, null, "Unexpected exception when evaluating object");
-                assert_false(member.name in obj);
-            }.bind(this), this.name + " interface: " + desc + ' must not have property "' + member.name + '"');
+        if (!exposed_in(exposure_set(member, this.exposureSet)))
+        {
+            if (!unexposed_properties.has(member.name))
+            {
+                unexposed_properties.add(member.name);
+                subsetTestByKey(this.name, test, function() {
+                    assert_equals(exception, null, "Unexpected exception when evaluating object");
+                    assert_false(member.name in obj);
+                }.bind(this), this.name + " interface: " + desc + ' must not have property "' + member.name + '"');
+            }
             continue;
         }
         if (member.type == "attribute" && member.isUnforgeable)
diff --git a/test/wpt/tests/resources/idlharness.js.headers b/test/wpt/tests/resources/idlharness.js.headers
new file mode 100644
index 00000000000..5e8f640c665
--- /dev/null
+++ b/test/wpt/tests/resources/idlharness.js.headers
@@ -0,0 +1,2 @@
+Content-Type: text/javascript; charset=utf-8
+Cache-Control: max-age=3600
diff --git a/test/wpt/tests/resources/readme.md b/test/wpt/tests/resources/readme.md
new file mode 100644
index 00000000000..09a62fbd7bf
--- /dev/null
+++ b/test/wpt/tests/resources/readme.md
@@ -0,0 +1,14 @@
+# Resources
+
+This directory contains utilities intended for use by tests and maintained as project infrastructure.
+It does not contain tests.
+
+## `testharness.js`
+
+`testharness.js` is a framework for writing low-level tests of
+browser functionality in javascript. It provides a convenient API for
+making assertions and is intended to work for both simple synchronous
+tests, and tests of asynchronous behaviour.
+
+Complete documentation is available in the `docs/` directory of this repository
+and on the web at https://web-platform-tests.org/writing-tests/.
diff --git a/test/wpt/tests/resources/sriharness.js b/test/wpt/tests/resources/sriharness.js
new file mode 100644
index 00000000000..943d677224f
--- /dev/null
+++ b/test/wpt/tests/resources/sriharness.js
@@ -0,0 +1,226 @@
+// `integrityValue` indicates the 'integrity' attribute value at the time of
+// #prepare-a-script.
+//
+// `integrityValueAfterPrepare` indicates how the 'integrity' attribute value
+// is modified after #prepare-a-script:
+// - `undefined` => not modified.
+// - `null` => 'integrity' attribute is removed.
+// - others => 'integrity' attribute value is set to that value.
+//
+// TODO: Make the arguments a dictionary for readability in the test files.
+var SRIScriptTest = function(pass, name, src, integrityValue, crossoriginValue, nonce, integrityValueAfterPrepare) {
+    this.pass = pass;
+    this.name = "Script: " + name;
+    this.src = src;
+    this.integrityValue = integrityValue;
+    this.crossoriginValue = crossoriginValue;
+    this.nonce = nonce;
+    this.integrityValueAfterPrepare = integrityValueAfterPrepare;
+}
+
+SRIScriptTest.prototype.execute = function() {
+    var test = async_test(this.name);
+    var e = document.createElement("script");
+    e.src = this.src;
+    if (this.integrityValue) {
+      e.setAttribute("integrity", this.integrityValue);
+    }
+    if(this.crossoriginValue) {
+        e.setAttribute("crossorigin", this.crossoriginValue);
+    }
+    if(this.nonce) {
+      e.setAttribute("nonce", this.nonce);
+    }
+    if(this.pass) {
+        e.addEventListener("load", function() {test.done()});
+        e.addEventListener("error", function() {
+            test.step(function(){ assert_unreached("Good load fired error handler.") })
+        });
+    } else {
+       e.addEventListener("load", function() {
+            test.step(function() { assert_unreached("Bad load succeeded.") })
+        });
+       e.addEventListener("error", function() {test.done()});
+    }
+    document.body.appendChild(e);
+
+    if (this.integrityValueAfterPrepare === null) {
+      e.removeAttribute("integrity");
+    } else if (this.integrityValueAfterPrepare !== undefined) {
+      e.setAttribute("integrity", this.integrityValueAfterPrepare);
+    }
+};
+
+function set_extra_attributes(element, attrs) {
+  // Apply the rest of the attributes, if any.
+  for (const [attr_name, attr_val] of Object.entries(attrs)) {
+    element[attr_name] = attr_val;
+  }
+}
+
+function buildElementFromDestination(resource_url, destination, attrs) {
+  // Assert: |destination| is a valid destination.
+  let element;
+
+  // The below switch is responsible for:
+  //   1. Creating the correct subresource element
+  //   2. Setting said element's href, src, or fetch-instigating property
+  //      appropriately.
+  switch (destination) {
+    case "script":
+      element = document.createElement(destination);
+      set_extra_attributes(element, attrs);
+      element.src = resource_url;
+      break;
+    case "style":
+      element = document.createElement('link');
+      set_extra_attributes(element, attrs);
+      element.rel = 'stylesheet';
+      element.href = resource_url;
+      break;
+    case "image":
+      element = document.createElement('img');
+      set_extra_attributes(element, attrs);
+      element.src = resource_url;
+      break;
+    default:
+      assert_unreached("INVALID DESTINATION");
+  }
+
+  return element;
+}
+
+// When using SRIPreloadTest, also include /preload/resources/preload_helper.js
+// |number_of_requests| is used to ensure that preload requests are actually
+// reused as expected.
+const SRIPreloadTest = (preload_sri_success, subresource_sri_success, name,
+                        number_of_requests, destination, resource_url,
+                        link_attrs, subresource_attrs) => {
+  const test = async_test(name);
+  const link = document.createElement('link');
+
+  // Early-fail in UAs that do not support `preload` links.
+  test.step_func(() => {
+    assert_true(link.relList.supports('preload'),
+      "This test is automatically failing because the browser does not" +
+      "support `preload` links.");
+  })();
+
+  // Build up the link.
+  link.rel = 'preload';
+  link.as = destination;
+  link.href = resource_url;
+  for (const [attr_name, attr_val] of Object.entries(link_attrs)) {
+    link[attr_name] = attr_val; // This may override `rel` to modulepreload.
+  }
+
+  // Preload + subresource success and failure loading functions.
+  const valid_preload_failed = test.step_func(() =>
+    { assert_unreached("Valid preload fired error handler.") });
+  const invalid_preload_succeeded = test.step_func(() =>
+    { assert_unreached("Invalid preload load succeeded.") });
+  const valid_subresource_failed = test.step_func(() =>
+    { assert_unreached("Valid subresource fired error handler.") });
+  const invalid_subresource_succeeded = test.step_func(() =>
+    { assert_unreached("Invalid subresource load succeeded.") });
+  const subresource_pass = test.step_func(() => {
+    verifyNumberOfResourceTimingEntries(resource_url, number_of_requests);
+    test.done();
+  });
+  const preload_pass = test.step_func(() => {
+    const subresource_element = buildElementFromDestination(
+      resource_url,
+      destination,
+      subresource_attrs
+    );
+
+    if (subresource_sri_success) {
+      subresource_element.onload = subresource_pass;
+      subresource_element.onerror = valid_subresource_failed;
+    } else {
+      subresource_element.onload = invalid_subresource_succeeded;
+      subresource_element.onerror = subresource_pass;
+    }
+
+    document.body.append(subresource_element);
+  });
+
+  if (preload_sri_success) {
+    link.onload = preload_pass;
+    link.onerror = valid_preload_failed;
+  } else {
+    link.onload = invalid_preload_succeeded;
+    link.onerror = preload_pass;
+  }
+
+  document.head.append(link);
+}
+
+// <link> tests
+// Style tests must be done synchronously because they rely on the presence
+// and absence of global style, which can affect later tests. Thus, instead
+// of executing them one at a time, the style tests are implemented as a
+// queue that builds up a list of tests, and then executes them one at a
+// time.
+var SRIStyleTest = function(queue, pass, name, attrs, customCallback, altPassValue) {
+    this.pass = pass;
+    this.name = "Style: " + name;
+    this.customCallback = customCallback || function () {};
+    this.attrs = attrs || {};
+    this.passValue = altPassValue || "rgb(255, 255, 0)";
+
+    this.test = async_test(this.name);
+
+    this.queue = queue;
+    this.queue.push(this);
+}
+
+SRIStyleTest.prototype.execute = function() {
+  var that = this;
+    var container = document.getElementById("container");
+    while (container.hasChildNodes()) {
+      container.removeChild(container.firstChild);
+    }
+
+    var test = this.test;
+
+    var div = document.createElement("div");
+    div.className = "testdiv";
+    var e = document.createElement("link");
+
+    // The link relation is guaranteed to not be "preload" or "modulepreload".
+    this.attrs.rel = this.attrs.rel || "stylesheet";
+    for (var key in this.attrs) {
+        if (this.attrs.hasOwnProperty(key)) {
+            e.setAttribute(key, this.attrs[key]);
+        }
+    }
+
+    if(this.pass) {
+        e.addEventListener("load", function() {
+            test.step(function() {
+                var background = window.getComputedStyle(div, null).getPropertyValue("background-color");
+                assert_equals(background, that.passValue);
+                test.done();
+            });
+        });
+        e.addEventListener("error", function() {
+            test.step(function(){ assert_unreached("Good load fired error handler.") })
+        });
+    } else {
+        e.addEventListener("load", function() {
+             test.step(function() { assert_unreached("Bad load succeeded.") })
+         });
+        e.addEventListener("error", function() {
+            test.step(function() {
+                var background = window.getComputedStyle(div, null).getPropertyValue("background-color");
+                assert_not_equals(background, that.passValue);
+                test.done();
+            });
+        });
+    }
+    container.appendChild(div);
+    container.appendChild(e);
+    this.customCallback(e, container);
+};
+
diff --git a/test/wpt/tests/resources/test-only-api.js b/test/wpt/tests/resources/test-only-api.js
new file mode 100644
index 00000000000..a66eb44ede7
--- /dev/null
+++ b/test/wpt/tests/resources/test-only-api.js
@@ -0,0 +1,31 @@
+'use strict';
+
+/* Whether the browser is Chromium-based with MojoJS enabled */
+const isChromiumBased = 'MojoInterfaceInterceptor' in self;
+/* Whether the browser is WebKit-based with internal test-only API enabled */
+const isWebKitBased = !isChromiumBased && 'internals' in self;
+
+/**
+ * Loads a script in a window or worker.
+ *
+ * @param {string} path - A script path
+ * @returns {Promise}
+ */
+function loadScript(path) {
+  if (typeof document === 'undefined') {
+    // Workers (importScripts is synchronous and may throw.)
+    importScripts(path);
+    return Promise.resolve();
+  } else {
+    // Window
+    const script = document.createElement('script');
+    script.src = path;
+    script.async = false;
+    const p = new Promise((resolve, reject) => {
+      script.onload = () => { resolve(); };
+      script.onerror = e => { reject(`Error loading ${path}`); };
+    })
+    document.head.appendChild(script);
+    return p;
+  }
+}
diff --git a/test/wpt/tests/resources/test-only-api.js.headers b/test/wpt/tests/resources/test-only-api.js.headers
new file mode 100644
index 00000000000..5e8f640c665
--- /dev/null
+++ b/test/wpt/tests/resources/test-only-api.js.headers
@@ -0,0 +1,2 @@
+Content-Type: text/javascript; charset=utf-8
+Cache-Control: max-age=3600
diff --git a/test/wpt/tests/resources/test-only-api.m.js b/test/wpt/tests/resources/test-only-api.m.js
new file mode 100644
index 00000000000..984f635abac
--- /dev/null
+++ b/test/wpt/tests/resources/test-only-api.m.js
@@ -0,0 +1,5 @@
+/* Whether the browser is Chromium-based with MojoJS enabled */
+export const isChromiumBased = 'MojoInterfaceInterceptor' in self;
+
+/* Whether the browser is WebKit-based with internal test-only API enabled */
+export const isWebKitBased = !isChromiumBased && 'internals' in self;
diff --git a/test/wpt/tests/resources/test-only-api.m.js.headers b/test/wpt/tests/resources/test-only-api.m.js.headers
new file mode 100644
index 00000000000..5e8f640c665
--- /dev/null
+++ b/test/wpt/tests/resources/test-only-api.m.js.headers
@@ -0,0 +1,2 @@
+Content-Type: text/javascript; charset=utf-8
+Cache-Control: max-age=3600
diff --git a/test/wpt/tests/resources/test/README.md b/test/wpt/tests/resources/test/README.md
new file mode 100644
index 00000000000..edc03ef214d
--- /dev/null
+++ b/test/wpt/tests/resources/test/README.md
@@ -0,0 +1,83 @@
+# `testharness.js` test suite
+
+The test suite for the `testharness.js` testing framework.
+
+## Executing Tests
+
+Install the following dependencies:
+
+- [Python 2.7.9+](https://www.python.org/)
+- [the tox Python package](https://tox.readthedocs.io/en/latest/)
+- [the Mozilla Firefox web browser](https://mozilla.org/firefox)
+- [the GeckoDriver server](https://github.com/mozilla/geckodriver)
+
+Make sure `geckodriver` can be found in your `PATH`.
+
+Currently, the tests should be run with the latest *Firefox Nightly*. In order to
+specify the path to Firefox Nightly, use the following command-line option:
+
+    tox -- --binary=/path/to/FirefoxNightly
+
+### Automated Script
+
+Alternatively, you may run `tools/ci/ci_resources_unittest.sh`, which only depends on
+Python 2. The script will install other dependencies automatically and start `tox` with
+the correct arguments.
+
+## Authoring Tests
+
+Test cases are expressed as `.html` files located within the `tests/unit/` and
+`tests/functional/` sub-directories. Each test should include the
+`testharness.js` library with the following markup:
+
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+
+This should be followed by one or more `<script>` tags that interface with the
+`testharness.js` API in some way. For example:
+
+    <script>
+    test(function() {
+        1 = 1;
+      }, 'This test is expected to fail.');
+    </script>
+
+### Unit tests
+
+The "unit test" type allows for concisely testing the expected behavior of
+assertion methods. These tests may define any number of sub-tests; the
+acceptance criteria is simply that all tests executed pass.
+
+### Functional tests
+
+Thoroughly testing the behavior of the harness itself requires ensuring a
+number of considerations which cannot be verified with the "unit testing"
+strategy. These include:
+
+- Ensuring that some tests are not run
+- Ensuring conditions that cause test failures
+- Ensuring conditions that cause harness errors
+
+Functional tests allow for these details to be verified. Every functional test
+must include a summary of the expected results as a JSON string within a
+`<script>` tag with an `id` of `"expected"`, e.g.:
+
+    <script type="text/json" id="expected">
+    {
+      "summarized_status": {
+        "message": null,
+        "stack": null,
+        "status_string": "OK"
+      },
+      "summarized_tests": [
+        {
+          "message": "ReferenceError: invalid assignment left-hand side",
+          "name": "Sample HTML5 API Tests",
+          "properties": {},
+          "stack": "(implementation-defined)",
+          "status_string": "FAIL"
+        }
+      ],
+      "type": "complete"
+    }
+    </script>
diff --git a/test/wpt/tests/resources/test/conftest.py b/test/wpt/tests/resources/test/conftest.py
new file mode 100644
index 00000000000..7253cac9acf
--- /dev/null
+++ b/test/wpt/tests/resources/test/conftest.py
@@ -0,0 +1,269 @@
+import copy
+import json
+import os
+import ssl
+import sys
+import subprocess
+import urllib
+
+import html5lib
+import py
+import pytest
+
+from wptserver import WPTServer
+
+HERE = os.path.dirname(os.path.abspath(__file__))
+WPT_ROOT = os.path.normpath(os.path.join(HERE, '..', '..'))
+HARNESS = os.path.join(HERE, 'harness.html')
+TEST_TYPES = ('functional', 'unit')
+
+sys.path.insert(0, os.path.normpath(os.path.join(WPT_ROOT, "tools")))
+import localpaths
+
+sys.path.insert(0, os.path.normpath(os.path.join(WPT_ROOT, "tools", "webdriver")))
+import webdriver
+
+
+def pytest_addoption(parser):
+    parser.addoption("--binary", action="store", default=None, help="path to browser binary")
+    parser.addoption("--headless", action="store_true", default=False, help="run browser in headless mode")
+
+
+def pytest_collect_file(file_path, path, parent):
+    if file_path.suffix.lower() != '.html':
+        return
+
+    # Tests are organized in directories by type
+    test_type = os.path.relpath(str(file_path), HERE)
+    if os.path.sep not in test_type or ".." in test_type:
+        # HTML files in this directory are not tests
+        return
+    test_type = test_type.split(os.path.sep)[1]
+
+    # Handle the deprecation of Node construction in pytest6
+    # https://docs.pytest.org/en/stable/deprecations.html#node-construction-changed-to-node-from-parent
+    if hasattr(HTMLItem, "from_parent"):
+        return HTMLItem.from_parent(parent, filename=str(file_path), test_type=test_type)
+    return HTMLItem(parent, str(file_path), test_type)
+
+
+def pytest_configure(config):
+    config.proc = subprocess.Popen(["geckodriver"])
+    config.add_cleanup(config.proc.kill)
+
+    capabilities = {"alwaysMatch": {"acceptInsecureCerts": True, "moz:firefoxOptions": {}}}
+    if config.getoption("--binary"):
+        capabilities["alwaysMatch"]["moz:firefoxOptions"]["binary"] = config.getoption("--binary")
+    if config.getoption("--headless"):
+        capabilities["alwaysMatch"]["moz:firefoxOptions"]["args"] = ["--headless"]
+
+    config.driver = webdriver.Session("localhost", 4444,
+                                      capabilities=capabilities)
+    config.add_cleanup(config.driver.end)
+
+    # Although the name of the `_create_unverified_context` method suggests
+    # that it is not intended for external consumption, the standard library's
+    # documentation explicitly endorses its use:
+    #
+    # > To revert to the previous, unverified, behavior
+    # > ssl._create_unverified_context() can be passed to the context
+    # > parameter.
+    #
+    # https://docs.python.org/2/library/httplib.html#httplib.HTTPSConnection
+    config.ssl_context = ssl._create_unverified_context()
+
+    config.server = WPTServer(WPT_ROOT)
+    config.server.start(config.ssl_context)
+    config.add_cleanup(config.server.stop)
+
+
+def resolve_uri(context, uri):
+    if uri.startswith('/'):
+        base = WPT_ROOT
+        path = uri[1:]
+    else:
+        base = os.path.dirname(context)
+        path = uri
+
+    return os.path.exists(os.path.join(base, path))
+
+
+def _summarize(actual):
+    def _scrub_stack(test_obj):
+        copy = dict(test_obj)
+        del copy['stack']
+        return copy
+
+    def _expand_status(status_obj):
+        for key, value in [item for item in status_obj.items()]:
+            # In "status" and "test" objects, the "status" value enum
+            # definitions are interspersed with properties for unrelated
+            # metadata. The following condition is a best-effort attempt to
+            # ignore non-enum properties.
+            if key != key.upper() or not isinstance(value, int):
+                continue
+
+            del status_obj[key]
+
+            if status_obj['status'] == value:
+                status_obj[u'status_string'] = key
+
+        del status_obj['status']
+
+        return status_obj
+
+    def _summarize_test(test_obj):
+        del test_obj['index']
+
+        assert 'phase' in test_obj
+        assert 'phases' in test_obj
+        assert 'COMPLETE' in test_obj['phases']
+        assert test_obj['phase'] == test_obj['phases']['COMPLETE']
+        del test_obj['phases']
+        del test_obj['phase']
+
+        return _expand_status(_scrub_stack(test_obj))
+
+    def _summarize_status(status_obj):
+        return _expand_status(_scrub_stack(status_obj))
+
+
+    summarized = {}
+
+    summarized[u'summarized_status'] = _summarize_status(actual['status'])
+    summarized[u'summarized_tests'] = [
+        _summarize_test(test) for test in actual['tests']]
+    summarized[u'summarized_tests'].sort(key=lambda test_obj: test_obj.get('name'))
+    summarized[u'summarized_asserts'] = [
+        {"assert_name": assert_item["assert_name"],
+        "test": assert_item["test"]["name"] if assert_item["test"] else None,
+        "args": assert_item["args"],
+        "status": assert_item["status"]} for assert_item in actual["asserts"]]
+    summarized[u'type'] = actual['type']
+
+    return summarized
+
+
+class HTMLItem(pytest.Item, pytest.Collector):
+    def __init__(self, parent, filename, test_type):
+        self.url = parent.session.config.server.url(filename)
+        self.type = test_type
+        # Some tests are reliant on the WPT servers substitution functionality,
+        # so tests must be retrieved from the server rather than read from the
+        # file system directly.
+        handle = urllib.request.urlopen(self.url,
+                                        context=parent.session.config.ssl_context)
+        try:
+            markup = handle.read()
+        finally:
+            handle.close()
+
+        if test_type not in TEST_TYPES:
+            raise ValueError('Unrecognized test type: "%s"' % test_type)
+
+        parsed = html5lib.parse(markup, namespaceHTMLElements=False)
+        name = None
+        self.expected = None
+
+        for element in parsed.iter():
+            if not name and element.tag == 'title':
+                name = element.text
+                continue
+            if element.tag == 'script':
+                if element.attrib.get('id') == 'expected':
+                    try:
+                        self.expected = json.loads(element.text)
+                    except ValueError:
+                        print("Failed parsing JSON in %s" % filename)
+                        raise
+
+        if not name:
+            raise ValueError('No name found in %s add a <title> element' % filename)
+        elif self.type == 'functional':
+            if not self.expected:
+                raise ValueError('Functional tests must specify expected report data')
+        elif self.type == 'unit' and self.expected:
+            raise ValueError('Unit tests must not specify expected report data')
+
+        # Ensure that distinct items have distinct fspath attributes.
+        # This is necessary because pytest has an internal cache keyed on it,
+        # and only the first test with any given fspath will be run.
+        #
+        # This cannot use super(HTMLItem, self).__init__(..) because only the
+        # Collector constructor takes the fspath argument.
+        pytest.Item.__init__(self, name, parent)
+        pytest.Collector.__init__(self, name, parent, fspath=py.path.local(filename))
+
+
+    def reportinfo(self):
+        return self.fspath, None, self.url
+
+    def repr_failure(self, excinfo):
+        return pytest.Collector.repr_failure(self, excinfo)
+
+    def runtest(self):
+        if self.type == 'unit':
+            self._run_unit_test()
+        elif self.type == 'functional':
+            self._run_functional_test()
+        else:
+            raise NotImplementedError
+
+    def _run_unit_test(self):
+        driver = self.session.config.driver
+        server = self.session.config.server
+
+        driver.url = server.url(HARNESS)
+
+        actual = driver.execute_async_script(
+            'runTest("%s", "foo", arguments[0])' % self.url
+        )
+
+        summarized = _summarize(copy.deepcopy(actual))
+
+        print(json.dumps(summarized, indent=2))
+
+        assert summarized[u'summarized_status'][u'status_string'] == u'OK', summarized[u'summarized_status'][u'message']
+        for test in summarized[u'summarized_tests']:
+            msg = "%s\n%s" % (test[u'name'], test[u'message'])
+            assert test[u'status_string'] == u'PASS', msg
+
+    def _run_functional_test(self):
+        driver = self.session.config.driver
+        server = self.session.config.server
+
+        driver.url = server.url(HARNESS)
+
+        test_url = self.url
+        actual = driver.execute_async_script('runTest("%s", "foo", arguments[0])' % test_url)
+
+        print(json.dumps(actual, indent=2))
+
+        summarized = _summarize(copy.deepcopy(actual))
+
+        print(json.dumps(summarized, indent=2))
+
+        # Test object ordering is not guaranteed. This weak assertion verifies
+        # that the indices are unique and sequential
+        indices = [test_obj.get('index') for test_obj in actual['tests']]
+        self._assert_sequence(indices)
+
+        self.expected[u'summarized_tests'].sort(key=lambda test_obj: test_obj.get('name'))
+
+        # Make asserts opt-in for now
+        if "summarized_asserts" not in self.expected:
+            del summarized["summarized_asserts"]
+        else:
+            # We can't be sure of the order of asserts even within the same test
+            # although we could also check for the failing assert being the final
+            # one
+            for obj in [summarized, self.expected]:
+                obj["summarized_asserts"].sort(
+                    key=lambda x: (x["test"] or "", x["status"], x["assert_name"], tuple(x["args"])))
+
+        assert summarized == self.expected
+
+    @staticmethod
+    def _assert_sequence(nums):
+        if nums and len(nums) > 0:
+            assert nums == list(range(1, nums[-1] + 1))
diff --git a/test/wpt/tests/resources/test/harness.html b/test/wpt/tests/resources/test/harness.html
new file mode 100644
index 00000000000..5ee0f285e83
--- /dev/null
+++ b/test/wpt/tests/resources/test/harness.html
@@ -0,0 +1,26 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+  </head>
+  <body>
+    <script>
+function runTest(url, id, done) {
+  var child;
+
+  function onMessage(event) {
+    if (!event.data || event.data.type !== 'complete') {
+      return;
+    }
+
+    window.removeEventListener('message', onMessage);
+    child.close();
+    done(event.data);
+  }
+  window.addEventListener('message', onMessage);
+
+  window.child = child = window.open(url, id);
+}
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/resources/test/idl-helper.js b/test/wpt/tests/resources/test/idl-helper.js
new file mode 100644
index 00000000000..2b73527ff2b
--- /dev/null
+++ b/test/wpt/tests/resources/test/idl-helper.js
@@ -0,0 +1,24 @@
+"use strict";
+
+var typedefFrom = interfaceFrom;
+var dictionaryFrom = interfaceFrom;
+function interfaceFrom(i) {
+    var idl = new IdlArray();
+    idl.add_idls(i);
+    for (var prop in idl.members) {
+        return idl.members[prop];
+    }
+}
+
+function memberFrom(m) {
+    var idl = new IdlArray();
+    idl.add_idls('interface A { ' + m + '; };');
+    return idl.members["A"].members[0];
+}
+
+function typeFrom(type) {
+    var ast = WebIDL2.parse('interface Foo { ' + type + ' a(); };');
+    ast = ast[0]; // get the first fragment
+    ast = ast.members[0]; // get the first member
+    return ast.idlType; // get the type of the first field
+}
diff --git a/test/wpt/tests/resources/test/nested-testharness.js b/test/wpt/tests/resources/test/nested-testharness.js
new file mode 100644
index 00000000000..d97c1568c75
--- /dev/null
+++ b/test/wpt/tests/resources/test/nested-testharness.js
@@ -0,0 +1,80 @@
+'use strict';
+
+/**
+ * Execute testharness.js and one or more scripts in an iframe. Report the
+ * results of the execution.
+ *
+ * @param {...function|...string} bodies - a function body. If specified as a
+ *                                         function object, it will be
+ *                                         serialized to a string using the
+ *                                         built-in
+ *                                         `Function.prototype.toString` prior
+ *                                         to inclusion in the generated
+ *                                         iframe.
+ *
+ * @returns {Promise} eventual value describing the result of the test
+ *                    execution; the summary object has two properties:
+ *                    `harness` (a string describing the harness status) and
+ *                    `tests` (an object whose "own" property names are the
+ *                    titles of the defined sub-tests and whose associated
+ *                    values are the subtest statuses).
+ */
+function makeTest(...bodies) {
+  const closeScript = '<' + '/script>';
+  let src = `
+<!DOCTYPE HTML>
+<html>
+<head>
+<title>Document title</title>
+<script src="/resources/testharness.js?${Math.random()}">${closeScript}
+</head>
+
+<body>
+<div id="log"></div>`;
+  bodies.forEach((body) => {
+    src += '<script>(' + body + ')();' + closeScript;
+  });
+
+  const iframe = document.createElement('iframe');
+
+  document.body.appendChild(iframe);
+  iframe.contentDocument.write(src);
+
+  return new Promise((resolve) => {
+    window.addEventListener('message', function onMessage(e) {
+      if (e.source !== iframe.contentWindow) {
+        return;
+      }
+      if (!e.data || e.data.type !=='complete') {
+        return;
+      }
+      window.removeEventListener('message', onMessage);
+      resolve(e.data);
+    });
+
+    iframe.contentDocument.close();
+  }).then(({ tests, status }) => {
+    const summary = {
+      harness: getEnumProp(status, status.status),
+      tests: {}
+    };
+
+    tests.forEach((test) => {
+      summary.tests[test.name] = getEnumProp(test, test.status);
+    });
+
+    return summary;
+  });
+}
+
+function getEnumProp(object, value) {
+  for (let property in object) {
+    if (!/^[A-Z]+$/.test(property)) {
+      continue;
+    }
+
+    if (object[property] === value) {
+      return property;
+    }
+  }
+}
diff --git a/test/wpt/tests/resources/test/requirements.txt b/test/wpt/tests/resources/test/requirements.txt
new file mode 100644
index 00000000000..95d87c38756
--- /dev/null
+++ b/test/wpt/tests/resources/test/requirements.txt
@@ -0,0 +1 @@
+html5lib==1.1
diff --git a/test/wpt/tests/resources/test/tests/functional/abortsignal.html b/test/wpt/tests/resources/test/tests/functional/abortsignal.html
new file mode 100644
index 00000000000..e6080e96ec9
--- /dev/null
+++ b/test/wpt/tests/resources/test/tests/functional/abortsignal.html
@@ -0,0 +1,49 @@
+<!DOCTYPE html>
+<title>Test#get_signal</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script>
+  "use strict";
+
+  setup(() => {
+    assert_implements_optional(window.AbortController, "No AbortController");
+  });
+
+  let signal;
+  let observed = false;
+
+  test(t => {
+    signal = t.get_signal();
+    assert_true(signal instanceof AbortSignal, "Returns an abort signal");
+    assert_false(signal.aborted, "Signal should not be aborted before test end");
+    signal.onabort = () => observed = true;
+  }, "t.signal existence");
+
+  test(t => {
+    assert_true(signal.aborted, "Signal should be aborted after test end");
+    assert_true(observed, "onabort should have been called");
+  }, "t.signal.aborted");
+</script>
+<script type="text/json" id="expected">
+{
+  "summarized_status": {
+    "message": null,
+    "status_string": "OK"
+  },
+  "summarized_tests": [
+    {
+      "message": null,
+      "name": "t.signal existence",
+      "properties": {},
+      "status_string": "PASS"
+    },
+    {
+      "message": null,
+      "name": "t.signal.aborted",
+      "properties": {},
+      "status_string": "PASS"
+    }
+  ],
+  "type": "complete"
+}
+</script>
diff --git a/test/wpt/tests/resources/test/tests/functional/add_cleanup.html b/test/wpt/tests/resources/test/tests/functional/add_cleanup.html
new file mode 100644
index 00000000000..468319fdbea
--- /dev/null
+++ b/test/wpt/tests/resources/test/tests/functional/add_cleanup.html
@@ -0,0 +1,91 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+<title>Test#add_cleanup</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+</head>
+<body>
+<div id="log"></div>
+<script>
+"use strict";
+
+var log_sync;
+test(function(t) {
+  log_sync = "";
+  t.add_cleanup(function() { log_sync += "1"; });
+  t.add_cleanup(function() { log_sync += "2"; });
+  t.add_cleanup(function() { log_sync += "3"; });
+  t.add_cleanup(function() { log_sync += "4"; });
+  t.add_cleanup(function() { log_sync += "5"; });
+  log_sync += "0";
+}, "probe synchronous");
+
+test(function() {
+  if (log_sync !== "012345") {
+    throw new Error("Expected: '012345'. Actual: '" + log_sync + "'.");
+  }
+}, "Cleanup methods are invoked exactly once and in the expected sequence.");
+
+var complete, log_async;
+async_test(function(t) {
+  complete = t.step_func(function() {
+    if (log_async !== "012") {
+      throw new Error("Expected: '012'. Actual: '" + log_async + "'.");
+    }
+
+    t.done();
+  });
+}, "Cleanup methods are invoked following the completion of asynchronous tests");
+
+async_test(function(t) {
+  log_async = "";
+  t.add_cleanup(function() { log_async += "1"; });
+
+  setTimeout(t.step_func(function() {
+    t.add_cleanup(function() {
+      log_async += "2";
+      complete();
+    });
+    log_async += "0";
+    t.done();
+  }), 0);
+}, "probe asynchronous");
+</script>
+<script type="text/json" id="expected">
+{
+  "summarized_status": {
+    "status_string": "OK",
+    "message": null
+  },
+  "summarized_tests": [
+    {
+      "status_string": "PASS",
+      "name": "Cleanup methods are invoked exactly once and in the expected sequence.",
+      "properties": {},
+      "message": null
+    },
+    {
+      "status_string": "PASS",
+      "name": "Cleanup methods are invoked following the completion of asynchronous tests",
+      "properties": {},
+      "message": null
+    },
+    {
+      "status_string": "PASS",
+      "name": "probe asynchronous",
+      "properties": {},
+      "message": null
+    },
+    {
+      "status_string": "PASS",
+      "name": "probe synchronous",
+      "properties": {},
+      "message": null
+    }
+  ],
+  "type": "complete"
+}
+</script>
+</body>
+</html>
diff --git a/test/wpt/tests/resources/test/tests/functional/add_cleanup_async.html b/test/wpt/tests/resources/test/tests/functional/add_cleanup_async.html
new file mode 100644
index 00000000000..07ade4b93b6
--- /dev/null
+++ b/test/wpt/tests/resources/test/tests/functional/add_cleanup_async.html
@@ -0,0 +1,85 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+<title>Test#add_cleanup with Promise-returning functions</title>
+<script src="../../../testharness.js"></script>
+<script src="../../../testharnessreport.js"></script>
+</head>
+<body>
+<div id="log"></div>
+
+<script>
+"use strict";
+var completeCount = 0;
+var counts = {
+    afterTick: null,
+    afterFirst: null
+};
+
+add_result_callback(function(result_t) {
+  completeCount += 1;
+});
+
+promise_test(function(t) {
+  t.add_cleanup(function() {
+    return new Promise(function(resolve) {
+      setTimeout(function() {
+        counts.afterTick = completeCount;
+        resolve();
+      }, 0);
+    });
+  });
+  t.add_cleanup(function() {
+    return new Promise(function(resolve) {
+
+      setTimeout(function() {
+        counts.afterFirst = completeCount;
+        resolve();
+      }, 0);
+    });
+  });
+
+  return Promise.resolve();
+}, 'promise_test with asynchronous cleanup');
+
+promise_test(function() {
+  assert_equals(
+    counts.afterTick,
+    0,
+    "test is not asynchronously considered 'complete'"
+  );
+  assert_equals(
+    counts.afterFirst,
+    0,
+    "test is not considered 'complete' following fulfillment of first promise"
+  );
+  assert_equals(completeCount, 1);
+
+  return Promise.resolve();
+}, "synchronously-defined promise_test");
+</script>
+<script type="text/json" id="expected">
+{
+  "summarized_status": {
+    "status_string": "OK",
+    "message": null
+  },
+  "summarized_tests": [
+    {
+      "status_string": "PASS",
+      "name": "promise_test with asynchronous cleanup",
+      "message": null,
+      "properties": {}
+    },
+    {
+      "status_string": "PASS",
+      "name": "synchronously-defined promise_test",
+      "message": null,
+      "properties": {}
+    }
+  ],
+  "type": "complete"
+}
+</script>
+</body>
+</html>
diff --git a/test/wpt/tests/resources/test/tests/functional/add_cleanup_async_bad_return.html b/test/wpt/tests/resources/test/tests/functional/add_cleanup_async_bad_return.html
new file mode 100644
index 00000000000..867bde2c399
--- /dev/null
+++ b/test/wpt/tests/resources/test/tests/functional/add_cleanup_async_bad_return.html
@@ -0,0 +1,50 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+<title>Test#add_cleanup with non-thenable-returning function</title>
+<script src="../../../testharness.js"></script>
+<script src="../../../testharnessreport.js"></script>
+</head>
+<body>
+<div id="log"></div>
+
+<script>
+"use strict";
+
+promise_test(function(t) {
+  t.add_cleanup(function() {});
+  t.add_cleanup(function() {
+    return { then: 9 };
+  });
+  t.add_cleanup(function() { return Promise.resolve(); });
+
+  return Promise.resolve();
+}, "promise_test that returns a non-thenable object in one \"cleanup\" callback");
+
+promise_test(function() {}, "The test runner is in an unpredictable state ('NOT RUN')");
+</script>
+<script type="text/json" id="expected">
+{
+  "summarized_status": {
+    "status_string": "ERROR",
+    "message": "Test named 'promise_test that returns a non-thenable object in one \"cleanup\" callback' specified 3 'cleanup' functions, and 1 returned a non-thenable value."
+  },
+  "summarized_tests": [
+    {
+      "status_string": "NOTRUN",
+      "name": "The test runner is in an unpredictable state ('NOT RUN')",
+      "message": null,
+      "properties": {}
+    },
+    {
+      "status_string": "PASS",
+      "name": "promise_test that returns a non-thenable object in one \"cleanup\" callback",
+      "message": null,
+      "properties": {}
+    }
+  ],
+  "type": "complete"
+}
+</script>
+</body>
+</html>
diff --git a/test/wpt/tests/resources/test/tests/functional/add_cleanup_async_rejection.html b/test/wpt/tests/resources/test/tests/functional/add_cleanup_async_rejection.html
new file mode 100644
index 00000000000..e51465e7eb0
--- /dev/null
+++ b/test/wpt/tests/resources/test/tests/functional/add_cleanup_async_rejection.html
@@ -0,0 +1,94 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+<title>Test#add_cleanup with Promise-returning functions (rejection handling)</title>
+<script src="../../../testharness.js"></script>
+<script src="../../../testharnessreport.js"></script>
+</head>
+<body>
+<div id="log"></div>
+
+<script>
+"use strict";
+var resolve, reject;
+var completeCount = 0;
+add_result_callback(function(result_t) {
+  completeCount += 1;
+});
+promise_test(function(t) {
+  t.add_cleanup(function() {
+    return new Promise(function(_, _reject) { reject = _reject; });
+  });
+  t.add_cleanup(function() {
+    return new Promise(function(_resolve) { resolve = _resolve; });
+  });
+
+  // The following cleanup function defines empty tests so that the reported
+  // data demonstrates the intended run-time behavior without relying on the
+  // test harness's handling of errors during test cleanup (which is tested
+  // elsewhere).
+  t.add_cleanup(function() {
+    if (completeCount === 0) {
+      promise_test(
+        function() {},
+        "test is not asynchronously considered 'complete' ('NOT RUN')"
+      );
+    }
+
+    reject();
+
+    setTimeout(function() {
+      if (completeCount === 0) {
+        promise_test(
+          function() {},
+          "test is not considered 'complete' following rejection of first " +
+          "promise ('NOT RUN')"
+        );
+      }
+
+      resolve();
+    }, 0);
+  });
+
+  return Promise.resolve();
+}, "promise_test with asynchronous cleanup including rejection");
+
+promise_test(function() {}, "synchronously-defined test ('NOT RUN')");
+</script>
+<script type="text/json" id="expected">
+{
+  "summarized_status": {
+    "status_string": "ERROR",
+    "message": "Test named 'promise_test with asynchronous cleanup including rejection' specified 3 'cleanup' functions, and 1 failed."
+  },
+  "summarized_tests": [
+    {
+      "status_string": "PASS",
+      "name": "promise_test with asynchronous cleanup including rejection",
+      "message": null,
+      "properties": {}
+    },
+    {
+      "status_string": "NOTRUN",
+      "name": "synchronously-defined test ('NOT RUN')",
+      "message": null,
+      "properties": {}
+    },
+    {
+      "status_string": "NOTRUN",
+      "name": "test is not asynchronously considered 'complete' ('NOT RUN')",
+      "message": null,
+      "properties": {}
+    },
+    {
+      "status_string": "NOTRUN",
+      "name": "test is not considered 'complete' following rejection of first promise ('NOT RUN')",
+      "message": null,
+      "properties": {}
+    }
+  ],
+  "type": "complete"
+}
+</script>
+</body>
+</html>
diff --git a/test/wpt/tests/resources/test/tests/functional/add_cleanup_async_rejection_after_load.html b/test/wpt/tests/resources/test/tests/functional/add_cleanup_async_rejection_after_load.html
new file mode 100644
index 00000000000..f9b28461000
--- /dev/null
+++ b/test/wpt/tests/resources/test/tests/functional/add_cleanup_async_rejection_after_load.html
@@ -0,0 +1,52 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+<title>Test#add_cleanup with Promise-returning functions (rejection handling following "load" event)</title>
+</head>
+<body>
+<h1>Promise Tests</h1>
+<p>This test demonstrates the use of <tt>promise_test</tt>. Assumes ECMAScript 6
+Promise support. Some failures are expected.</p>
+<div id="log"></div>
+<script src="../../../testharness.js"></script>
+<script src="../../../testharnessreport.js"></script>
+<script>
+promise_test(function(t) {
+  t.add_cleanup(function() {
+    return Promise.reject(new Error("foo"));
+  });
+
+  return new Promise((resolve) => {
+    document.addEventListener("DOMContentLoaded", function() {
+      setTimeout(resolve, 0)
+    });
+  });
+}, "Test with failing cleanup that completes after DOMContentLoaded event");
+
+promise_test(function(t) {
+  return Promise.resolve();
+}, "Test that should not be run due to invalid harness state ('NOT RUN')");
+</script>
+<script type="text/json" id="expected">
+{
+  "summarized_status": {
+    "status_string": "ERROR",
+    "message": "Test named 'Test with failing cleanup that completes after DOMContentLoaded event' specified 1 'cleanup' function, and 1 failed."
+  },
+  "summarized_tests": [
+    {
+      "status_string": "NOTRUN",
+      "name": "Test that should not be run due to invalid harness state ('NOT RUN')",
+      "message": null,
+      "properties": {}
+    },
+    {
+      "status_string": "PASS",
+      "name": "Test with failing cleanup that completes after DOMContentLoaded event",
+      "message": null,
+      "properties": {}
+    }
+  ],
+  "type": "complete"
+}
+</script>
diff --git a/test/wpt/tests/resources/test/tests/functional/add_cleanup_async_timeout.html b/test/wpt/tests/resources/test/tests/functional/add_cleanup_async_timeout.html
new file mode 100644
index 00000000000..429536ce6ee
--- /dev/null
+++ b/test/wpt/tests/resources/test/tests/functional/add_cleanup_async_timeout.html
@@ -0,0 +1,57 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+<title>Test#add_cleanup with Promise-returning functions (timeout handling)</title>
+<script src="../../../testharness.js"></script>
+<script src="../../../testharnessreport.js"></script>
+</head>
+<body>
+<div id="log"></div>
+<script>
+"use strict";
+
+promise_test(function(t) {
+  t.add_cleanup(function() {
+    return Promise.resolve();
+  });
+
+  t.add_cleanup(function() {
+    return new Promise(function() {});
+  });
+
+  t.add_cleanup(function() {});
+
+  t.add_cleanup(function() {
+    return new Promise(function() {});
+  });
+
+  return Promise.resolve();
+}, "promise_test with asynchronous cleanup");
+
+promise_test(function() {}, "promise_test following timed out cleanup ('NOT RUN')");
+</script>
+<script type="text/json" id="expected">
+{
+  "summarized_status": {
+    "status_string": "ERROR",
+    "message": "Timeout while running cleanup for test named \"promise_test with asynchronous cleanup\"."
+  },
+  "summarized_tests": [
+    {
+      "status_string": "NOTRUN",
+      "name": "promise_test following timed out cleanup ('NOT RUN')",
+      "message": null,
+      "properties": {}
+    },
+    {
+      "status_string": "PASS",
+      "name": "promise_test with asynchronous cleanup",
+      "message": null,
+      "properties": {}
+    }
+  ],
+  "type": "complete"
+}
+</script>
+</body>
+</html>
diff --git a/test/wpt/tests/resources/test/tests/functional/add_cleanup_bad_return.html b/test/wpt/tests/resources/test/tests/functional/add_cleanup_bad_return.html
new file mode 100644
index 00000000000..3cfb28adf25
--- /dev/null
+++ b/test/wpt/tests/resources/test/tests/functional/add_cleanup_bad_return.html
@@ -0,0 +1,61 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+<title>Test#add_cleanup with value-returning function</title>
+<script src="../../../testharness.js"></script>
+<script src="../../../testharnessreport.js"></script>
+</head>
+<body>
+<div id="log"></div>
+<script>
+"use strict";
+
+test(function(t) {
+  t.add_cleanup(function() {});
+  t.add_cleanup(function() { return null; });
+  t.add_cleanup(function() {
+    test(
+      function() {},
+      "The test runner is in an unpredictable state #1 ('NOT RUN')"
+    );
+
+    throw new Error();
+  });
+  t.add_cleanup(function() { return 4; });
+  t.add_cleanup(function() { return { then: function() {} }; });
+  t.add_cleanup(function() {});
+}, "Test that returns a value in three \"cleanup\" functions");
+
+test(function() {}, "The test runner is in an unpredictable state #2 ('NOT RUN')");
+</script>
+<script type="text/json" id="expected">
+{
+  "summarized_status": {
+    "status_string": "ERROR",
+    "message": "Test named 'Test that returns a value in three \"cleanup\" functions' specified 6 'cleanup' functions, and 1 failed, and 3 returned a non-undefined value."
+  },
+  "summarized_tests": [
+    {
+      "status_string": "PASS",
+      "name": "Test that returns a value in three \"cleanup\" functions",
+      "properties": {},
+      "message": null
+    },
+    {
+      "status_string": "NOTRUN",
+      "name": "The test runner is in an unpredictable state #1 ('NOT RUN')",
+      "message": null,
+      "properties": {}
+    },
+    {
+      "status_string": "NOTRUN",
+      "name": "The test runner is in an unpredictable state #2 ('NOT RUN')",
+      "message": null,
+      "properties": {}
+    }
+  ],
+  "type": "complete"
+}
+</script>
+</body>
+</html>
diff --git a/test/wpt/tests/resources/test/tests/functional/add_cleanup_count.html b/test/wpt/tests/resources/test/tests/functional/add_cleanup_count.html
new file mode 100644
index 00000000000..2c9b51c6d0e
--- /dev/null
+++ b/test/wpt/tests/resources/test/tests/functional/add_cleanup_count.html
@@ -0,0 +1,39 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+<title>Test#add_cleanup reported count</title>
+<script src="../../../testharness.js"></script>
+<script src="../../../testharnessreport.js"></script>
+</head>
+<body>
+<div id="log"></div>
+
+<script>
+promise_test(function(t) {
+    t.add_cleanup(function() {});
+    t.add_cleanup(function() {});
+    t.add_cleanup(function() { throw new Error(); });
+    new EventWatcher(t, document.body, []);
+
+    return Promise.resolve();
+}, 'test with 3 user-defined cleanup functions');
+</script>
+<script type="text/json" id="expected">
+{
+  "summarized_status": {
+    "status_string": "ERROR",
+    "message": "Test named 'test with 3 user-defined cleanup functions' specified 3 'cleanup' functions, and 1 failed."
+  },
+  "summarized_tests": [
+    {
+      "status_string": "PASS",
+      "name": "test with 3 user-defined cleanup functions",
+      "message": null,
+      "properties": {}
+    }
+  ],
+  "type": "complete"
+}
+</script>
+</body>
+</html>
diff --git a/test/wpt/tests/resources/test/tests/functional/add_cleanup_err.html b/test/wpt/tests/resources/test/tests/functional/add_cleanup_err.html
new file mode 100644
index 00000000000..60357c66ee9
--- /dev/null
+++ b/test/wpt/tests/resources/test/tests/functional/add_cleanup_err.html
@@ -0,0 +1,45 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+<title>Test#add_cleanup: error</title>
+<script src="../../../testharness.js"></script>
+<script src="../../../testharnessreport.js"></script>
+</head>
+<body>
+<div id="log"></div>
+<script>
+"use strict";
+
+test(function(t) {
+  t.add_cleanup(function() {
+    throw new Error('exception in cleanup function');
+  });
+}, "Exception in cleanup function causes harness failure.");
+
+test(function() {}, "This test should not be run.");
+</script>
+<script type="text/json" id="expected">
+{
+  "summarized_status": {
+    "status_string": "ERROR",
+    "message": "Test named 'Exception in cleanup function causes harness failure.' specified 1 'cleanup' function, and 1 failed."
+  },
+  "summarized_tests": [
+    {
+      "status_string": "PASS",
+      "name": "Exception in cleanup function causes harness failure.",
+      "properties": {},
+      "message": null
+    },
+    {
+      "status_string": "NOTRUN",
+      "name": "This test should not be run.",
+      "properties": {},
+      "message": null
+    }
+  ],
+  "type": "complete"
+}
+</script>
+</body>
+</html>
diff --git a/test/wpt/tests/resources/test/tests/functional/add_cleanup_err_multi.html b/test/wpt/tests/resources/test/tests/functional/add_cleanup_err_multi.html
new file mode 100644
index 00000000000..80ba1b49590
--- /dev/null
+++ b/test/wpt/tests/resources/test/tests/functional/add_cleanup_err_multi.html
@@ -0,0 +1,52 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+<title>Test#add_cleanup: multiple functions with one in error</title>
+<script src="../../../testharness.js"></script>
+<script src="../../../testharnessreport.js"></script>
+</head>
+<body>
+<div id="log"></div>
+
+<script>
+"use strict";
+
+test(function(t) {
+    t.add_cleanup(function() {
+      throw new Error("exception in cleanup function");
+    });
+
+    // The following cleanup function defines a test so that the reported
+    // data demonstrates the intended run-time behavior, i.e. that
+    // `testharness.js` invokes all cleanup functions even when one or more
+    // throw errors.
+    t.add_cleanup(function() {
+      test(function() {}, "Verification test");
+    });
+  }, "Test with multiple cleanup functions");
+</script>
+<script type="text/json" id="expected">
+{
+  "summarized_status": {
+    "status_string": "ERROR",
+    "message": "Test named 'Test with multiple cleanup functions' specified 2 'cleanup' functions, and 1 failed."
+  },
+  "summarized_tests": [
+    {
+      "status_string": "PASS",
+      "name": "Test with multiple cleanup functions",
+      "properties": {},
+      "message": null
+    },
+    {
+      "status_string": "NOTRUN",
+      "name": "Verification test",
+      "properties": {},
+      "message": null
+    }
+  ],
+  "type": "complete"
+}
+</script>
+</body>
+</html>
diff --git a/test/wpt/tests/resources/test/tests/functional/add_cleanup_sync_queue.html b/test/wpt/tests/resources/test/tests/functional/add_cleanup_sync_queue.html
new file mode 100644
index 00000000000..0a61503cc80
--- /dev/null
+++ b/test/wpt/tests/resources/test/tests/functional/add_cleanup_sync_queue.html
@@ -0,0 +1,55 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+<title>Test#add_cleanup: queuing tests</title>
+<script src="../../../testharness.js"></script>
+<script src="../../../testharnessreport.js"></script>
+</head>
+<body>
+<div id="log"></div>
+
+<script>
+"use strict";
+var firstCleaned = false;
+
+promise_test(function(t) {
+  promise_test(function() {
+    assert_true(
+      firstCleaned, "should not execute until first test is complete"
+    );
+
+    return Promise.resolve();
+  }, "test defined when no tests are queued, but one test is executing");
+
+  t.add_cleanup(function() {
+    firstCleaned = true;
+  });
+
+  return Promise.resolve();
+}, "Test with a 'cleanup' function");
+</script>
+<script type="text/json" id="expected">
+{
+  "summarized_status": {
+    "message": null,
+    "status_string": "OK"
+  },
+  "summarized_tests": [
+    {
+      "message": null,
+      "name": "Test with a 'cleanup' function",
+      "status_string": "PASS",
+      "properties": {}
+    },
+    {
+      "message": null,
+      "name": "test defined when no tests are queued, but one test is executing",
+      "status_string": "PASS",
+      "properties": {}
+    }
+  ],
+  "type": "complete"
+}
+</script>
+</body>
+</html>
diff --git a/test/wpt/tests/resources/test/tests/functional/api-tests-1.html b/test/wpt/tests/resources/test/tests/functional/api-tests-1.html
new file mode 100644
index 00000000000..9de875b0f12
--- /dev/null
+++ b/test/wpt/tests/resources/test/tests/functional/api-tests-1.html
@@ -0,0 +1,991 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+<title>Sample HTML5 API Tests</title>
+<meta name="timeout" content="6000">
+</head>
+<body onload="load_test_attr.done()">
+<h1>Sample HTML5 API Tests</h1>
+<div id="log"></div>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script>
+    setup_run = false;
+    setup(function() {
+            setup_run = true;
+          });
+    test(function() {assert_true(setup_run)}, "Setup function ran");
+
+    // Two examples for testing events from handler and attributes
+    var load_test_event = async_test("window onload event fires when set from the handler");
+
+    function windowLoad()
+    {
+        load_test_event.done();
+    }
+    on_event(window, "load", windowLoad);
+
+    test(function() {
+        var sequence = [];
+        var outer = document.createElement("div");
+        var inner = document.createElement("div");
+        outer.appendChild(inner);
+        document.body.appendChild(outer);
+        inner.addEventListener("click", function() {
+            sequence.push("inner");
+        }, false);
+
+        on_event(outer, "click", function() {
+            sequence.push("outer");
+        });
+        inner.click();
+
+        assert_array_equals(sequence, ["inner", "outer"]);
+    }, "on_event does not use event capture");
+
+    // see the body onload below
+    var load_test_attr = async_test("body element fires the onload event set from the attribute");
+</script>
+<script>
+    function bodyElement()
+    {
+        assert_equals(document.body, document.getElementsByTagName("body")[0]);
+    }
+    test(bodyElement, "document.body should be the first body element in the document");
+
+    test(function() {
+        assert_equals(1,1);
+        assert_equals(NaN, NaN, "NaN case");
+        assert_equals(0, 0, "Zero case");
+    }, "assert_equals tests")
+
+    test(function() {
+        assert_equals(-0, 0, "Zero case");
+    }, "assert_equals tests expected to fail")
+
+    test(function() {
+        assert_not_equals({}, {}, "object case");
+        assert_not_equals(-0, 0, "Zero case");
+    }, "assert_not_equals tests")
+
+    function testAssertPass()
+    {
+        assert_true(true);
+    }
+    test(testAssertPass, "assert_true expected to pass");
+
+    function testAssertFalse()
+    {
+        assert_true(false, "false should not be true");
+    }
+    test(testAssertFalse, "assert_true expected to fail");
+
+    function basicAssertArrayEquals()
+    {
+        assert_array_equals([1, NaN], [1, NaN], "[1, NaN] is equal to [1, NaN]");
+    }
+    test(basicAssertArrayEquals, "basic assert_array_equals test");
+
+    function assertArrayEqualsUndefined()
+    {
+        assert_array_equals(undefined, [1], "undefined equals [1]?");
+    }
+    test(assertArrayEqualsUndefined, "assert_array_equals with first param undefined");
+
+    function assertArrayEqualsTrue()
+    {
+        assert_array_equals(true, [1], "true equals [1]?");
+    }
+    test(assertArrayEqualsTrue, "assert_array_equals with first param true");
+
+    function assertArrayEqualsFalse()
+    {
+        assert_array_equals(false, [1], "false equals [1]?");
+    }
+    test(assertArrayEqualsFalse, "assert_array_equals with first param false");
+
+    function assertArrayEqualsNull()
+    {
+        assert_array_equals(null, [1], "null equals [1]?");
+    }
+    test(assertArrayEqualsNull, "assert_array_equals with first param null");
+
+    function assertArrayEqualsNumeric()
+    {
+        assert_array_equals(1, [1], "1 equals [1]?");
+    }
+    test(assertArrayEqualsNumeric, "assert_array_equals with first param 1");
+
+    function basicAssertArrayApproxEquals()
+    {
+        assert_array_approx_equals([10, 11], [11, 10], 1, "[10, 11] is approximately (+/- 1) [11, 10]")
+    }
+    test(basicAssertArrayApproxEquals, "basic assert_array_approx_equals test");
+
+    function basicAssertApproxEquals()
+    {
+        assert_approx_equals(10, 11, 1, "10 is approximately (+/- 1) 11")
+    }
+    test(basicAssertApproxEquals, "basic assert_approx_equals test");
+
+    function basicAssertLessThan()
+    {
+        assert_less_than(10, 11, "10 is less than 11")
+    }
+    test(basicAssertApproxEquals, "basic assert_less_than test");
+
+    function basicAssertGreaterThan()
+    {
+        assert_greater_than(10, 11, "10 is not greater than 11");
+    }
+    test(basicAssertGreaterThan, "assert_greater_than expected to fail");
+
+    function basicAssertGreaterThanEqual()
+    {
+        assert_greater_than_equal(10, 10, "10 is greater than or equal to 10")
+    }
+    test(basicAssertGreaterThanEqual, "basic assert_greater_than_equal test");
+
+    function basicAssertLessThanEqual()
+    {
+        assert_greater_than_equal('10', 10, "'10' is not a number")
+    }
+    test(basicAssertLessThanEqual, "assert_less_than_equal expected to fail");
+
+    function testAssertInherits() {
+        var A = function(){this.a = "a"}
+        A.prototype = {b:"b"}
+        var a = new A();
+        assert_own_property(a, "a");
+        assert_not_own_property(a, "b", "unexpected property found: \"b\"");
+        assert_inherits(a, "b");
+    }
+    test(testAssertInherits, "test for assert[_not]_own_property and insert_inherits")
+
+    test(function()
+    {
+        var a = document.createElement("a")
+        var b = document.createElement("b")
+        assert_throws_dom("NOT_FOUND_ERR", function () {a.removeChild(b)});
+    }, "Test throw DOM exception")
+
+    test(function()
+    {
+        var a = document.createElement("a")
+        var b = document.createElement("b")
+        assert_throws_js(DOMException, function () {a.removeChild(b)});
+    }, "Test throw DOMException as JS exception expected to fail")
+
+    test(function()
+    {
+        assert_throws_js(SyntaxError, function () {document.querySelector("")});
+    }, "Test throw SyntaxError DOMException where JS SyntaxError expected; expected to fail")
+
+    test(function()
+    {
+        assert_throws_js(SyntaxError, function () {JSON.parse("{")});
+    }, "Test throw JS SyntaxError")
+
+    test(function()
+    {
+        assert_throws_dom("SyntaxError", function () {document.querySelector("")});
+    }, "Test throw DOM SyntaxError")
+
+    test(function()
+    {
+        var ifr = document.createElement("iframe");
+        document.body.appendChild(ifr);
+        this.add_cleanup(() => ifr.remove());
+        assert_throws_dom("SyntaxError", ifr.contentWindow.DOMException,
+                          function () {ifr.contentDocument.querySelector("")});
+    }, "Test throw DOM SyntaxError from subframe");
+
+    test(function()
+    {
+        var ifr = document.createElement("iframe");
+        document.body.appendChild(ifr);
+        this.add_cleanup(() => ifr.remove());
+        assert_throws_dom("SyntaxError",
+                          function () {ifr.contentDocument.querySelector("")});
+    }, "Test throw DOM SyntaxError from subframe with incorrect global expectation; expected to fail");
+
+    test(function()
+    {
+        var ifr = document.createElement("iframe");
+        document.body.appendChild(ifr);
+        this.add_cleanup(() => ifr.remove());
+        assert_throws_dom("SyntaxError", ifr.contentWindow.DOMException,
+                          function () {document.querySelector("")});
+    }, "Test throw DOM SyntaxError with incorrect expectation; expected to fail");
+
+    test(function()
+    {
+        assert_throws_dom("SyntaxError", function () {JSON.parse("{")});
+    }, "Test throw JS SyntaxError where SyntaxError DOMException expected; expected to fail")
+
+    test(function()
+    {
+        var a = document.createTextNode("a")
+        var b = document.createElement("b")
+        assert_throws_dom("NOT_FOUND_ERR", function () {a.appendChild(b)});
+    }, "Test throw DOM exception expected to fail")
+
+    test(function()
+    {
+        var e = new DOMException("I am not known", "TEST_ERROR_NO_SUCH_THING");
+        assert_throws_dom(0, function() {throw e});
+    }, "Test assert_throws_dom with ambiguous DOM-exception expected to Fail");
+
+    test(function()
+    {
+        var e = {code:0, name:"TEST_ERR", TEST_ERR:0};
+        e.constructor = DOMException;
+        assert_throws_dom("TEST_ERR", function() {throw e});
+    }, "Test assert_throws_dom with non-DOM-exception expected to Fail");
+
+    test(function()
+    {
+        var e = {code: DOMException.SYNTAX_ERR, name:"SyntaxError"};
+        e.constructor = DOMException;
+        assert_throws_dom(DOMException.SYNTAX_ERR, function() {throw e});
+    }, "Test assert_throws_dom with number code value expected to Pass");
+
+    test(function()
+    {
+        var e = new DOMException("Some message", "SyntaxError");
+        assert_throws_dom(DOMException.SYNTAX_ERR, function() {throw e});
+    }, "Test assert_throws_dom with number code value and real DOMException expected to Pass");
+
+    var t = async_test("Test step_func")
+    setTimeout(
+      t.step_func(
+        function () {
+          assert_true(true); t.done();
+        }), 0);
+
+    async_test(function(t) {
+        setTimeout(t.step_func(function (){assert_true(true); t.done();}), 0);
+    }, "Test async test with callback");
+
+    async_test(function() {
+        setTimeout(this.step_func(function (){assert_true(true); this.done();}), 0);
+    }, "Test async test with callback and `this` obj.");
+
+    async_test("test should timeout (fail) with the default of 2 seconds").step(function(){});
+
+    async_test("async test that is never started, should have status Not Run");
+
+
+    test(function(t) {
+             window.global = 1;
+             t.add_cleanup(function() {delete window.global});
+             assert_equals(window.global, 1);
+         },
+         "Test that defines a global and cleans it up");
+
+    test(function() {assert_equals(window.global, undefined)},
+         "Test that cleanup handlers from previous test ran");
+
+</script>
+<script type="text/json" id="expected">
+{
+  "summarized_status": {
+    "status_string": "TIMEOUT",
+    "message": null
+  },
+  "summarized_tests": [
+    {
+      "status_string": "PASS",
+      "name": "Setup function ran",
+      "message": null,
+      "properties": {}
+    },
+    {
+      "status_string": "FAIL",
+      "name": "Test assert_throws_dom with ambiguous DOM-exception expected to Fail",
+      "message": "Test bug: ambiguous DOMException code 0 passed to assert_throws_dom()",
+      "properties": {}
+    },
+    {
+      "status_string": "FAIL",
+      "name": "Test assert_throws_dom with non-DOM-exception expected to Fail",
+      "message": "Test bug: unrecognized DOMException code name or name \"TEST_ERR\" passed to assert_throws_dom()",
+      "properties": {}
+    },
+    {
+      "status_string": "PASS",
+      "name": "Test assert_throws_dom with number code value expected to Pass",
+      "message": null,
+      "properties": {}
+    },
+    {
+      "status_string": "PASS",
+      "name": "Test assert_throws_dom with number code value and real DOMException expected to Pass",
+      "message": null,
+      "properties": {}
+    },
+    {
+      "status_string": "PASS",
+      "name": "Test async test with callback",
+      "message": null,
+      "properties": {}
+    },
+    {
+      "status_string": "PASS",
+      "name": "Test async test with callback and `this` obj.",
+      "message": null,
+      "properties": {}
+    },
+    {
+      "status_string": "PASS",
+      "name": "Test step_func",
+      "message": null,
+      "properties": {}
+    },
+    {
+      "status_string": "PASS",
+      "name": "Test that cleanup handlers from previous test ran",
+      "message": null,
+      "properties": {}
+    },
+    {
+      "status_string": "PASS",
+      "name": "Test that defines a global and cleans it up",
+      "message": null,
+      "properties": {}
+    },
+    {
+      "status_string": "PASS",
+      "name": "Test throw DOM exception",
+      "message": null,
+      "properties": {}
+    },
+    {
+      "status_string": "FAIL",
+      "name": "Test throw DOMException as JS exception expected to fail",
+      "message": "assert_throws_js: function \"function DOMException() {\n    [native code]\n}\" is not an Error subtype",
+      "properties": {}
+    },
+    {
+      "status_string": "FAIL",
+      "name": "Test throw SyntaxError DOMException where JS SyntaxError expected; expected to fail",
+      "message": "assert_throws_js: function \"function () {document.querySelector(\"\")}\" threw object \"SyntaxError: Document.querySelector: '' is not a valid selector\" (\"SyntaxError\") expected instance of function \"function SyntaxError() {\n    [native code]\n}\" (\"SyntaxError\")",
+      "properties": {}
+    },
+    {
+      "status_string": "PASS",
+      "name": "Test throw JS SyntaxError",
+      "message": null,
+      "properties": {}
+    },
+    {
+      "status_string": "PASS",
+      "name": "Test throw DOM SyntaxError",
+      "message": null,
+      "properties": {}
+    },
+    {
+      "status_string": "PASS",
+      "name": "Test throw DOM SyntaxError from subframe",
+      "message": null,
+      "properties": {}
+    },
+    {
+      "status_string": "FAIL",
+      "name": "Test throw DOM SyntaxError from subframe with incorrect global expectation; expected to fail",
+      "message": "assert_throws_dom: function \"function () {ifr.contentDocument.querySelector(\"\")}\" threw an exception from the wrong global",
+      "properties": {}
+    },
+    {
+      "status_string": "FAIL",
+      "name": "Test throw DOM SyntaxError with incorrect expectation; expected to fail",
+      "message": "assert_throws_dom: function \"function () {document.querySelector(\"\")}\" threw an exception from the wrong global",
+      "properties": {}
+    },
+    {
+      "status_string": "FAIL",
+      "name": "Test throw JS SyntaxError where SyntaxError DOMException expected; expected to fail",
+      "message": "assert_throws_dom: function \"function () {JSON.parse(\"{\")}\" threw object \"SyntaxError: JSON.parse: end of data while reading object contents at line 1 column 2 of the JSON data\" that is not a DOMException SyntaxError: property \"code\" is equal to undefined, expected 12",
+      "properties": {}
+    },
+    {
+      "status_string": "FAIL",
+      "name": "Test throw DOM exception expected to fail",
+      "message": "assert_throws_dom: function \"function () {a.appendChild(b)}\" threw object \"HierarchyRequestError: Node.appendChild: Cannot add children to a Text\" that is not a DOMException NOT_FOUND_ERR: property \"code\" is equal to 3, expected 8",
+      "properties": {}
+    },
+    {
+      "status_string": "FAIL",
+      "name": "assert_array_equals with first param 1",
+      "message": "assert_array_equals: 1 equals [1]? value is 1, expected array",
+      "properties": {}
+    },
+    {
+      "status_string": "FAIL",
+      "name": "assert_array_equals with first param false",
+      "message": "assert_array_equals: false equals [1]? value is false, expected array",
+      "properties": {}
+    },
+    {
+      "status_string": "FAIL",
+      "name": "assert_array_equals with first param null",
+      "message": "assert_array_equals: null equals [1]? value is null, expected array",
+      "properties": {}
+    },
+    {
+      "status_string": "FAIL",
+      "name": "assert_array_equals with first param true",
+      "message": "assert_array_equals: true equals [1]? value is true, expected array",
+      "properties": {}
+    },
+    {
+      "status_string": "FAIL",
+      "name": "assert_array_equals with first param undefined",
+      "message": "assert_array_equals: undefined equals [1]? value is undefined, expected array",
+      "properties": {}
+    },
+    {
+      "status_string": "PASS",
+      "name": "assert_equals tests",
+      "message": null,
+      "properties": {}
+    },
+    {
+      "status_string": "FAIL",
+      "name": "assert_equals tests expected to fail",
+      "message": "assert_equals: Zero case expected 0 but got -0",
+      "properties": {}
+    },
+    {
+      "status_string": "FAIL",
+      "name": "assert_greater_than expected to fail",
+      "message": "assert_greater_than: 10 is not greater than 11 expected a number greater than 11 but got 10",
+      "properties": {}
+    },
+    {
+      "status_string": "FAIL",
+      "name": "assert_less_than_equal expected to fail",
+      "message": "assert_greater_than_equal: '10' is not a number expected a number but got a \"string\"",
+      "properties": {}
+    },
+    {
+      "status_string": "PASS",
+      "name": "assert_not_equals tests",
+      "message": null,
+      "properties": {}
+    },
+    {
+      "status_string": "FAIL",
+      "name": "assert_true expected to fail",
+      "message": "assert_true: false should not be true expected true got false",
+      "properties": {}
+    },
+    {
+      "status_string": "PASS",
+      "name": "assert_true expected to pass",
+      "message": null,
+      "properties": {}
+    },
+    {
+      "status_string": "NOTRUN",
+      "name": "async test that is never started, should have status Not Run",
+      "message": null,
+      "properties": {}
+    },
+    {
+      "status_string": "PASS",
+      "name": "basic assert_approx_equals test",
+      "message": null,
+      "properties": {}
+    },
+    {
+      "status_string": "PASS",
+      "name": "basic assert_array_approx_equals test",
+      "message": null,
+      "properties": {}
+    },
+    {
+      "status_string": "PASS",
+      "name": "basic assert_array_equals test",
+      "message": null,
+      "properties": {}
+    },
+    {
+      "status_string": "PASS",
+      "name": "basic assert_greater_than_equal test",
+      "message": null,
+      "properties": {}
+    },
+    {
+      "status_string": "PASS",
+      "name": "basic assert_less_than test",
+      "message": null,
+      "properties": {}
+    },
+    {
+      "status_string": "PASS",
+      "name": "body element fires the onload event set from the attribute",
+      "message": null,
+      "properties": {}
+    },
+    {
+      "status_string": "PASS",
+      "name": "document.body should be the first body element in the document",
+      "message": null,
+      "properties": {}
+    },
+    {
+      "status_string": "PASS",
+      "name": "test for assert[_not]_own_property and insert_inherits",
+      "message": null,
+      "properties": {}
+    },
+    {
+      "status_string": "TIMEOUT",
+      "name": "test should timeout (fail) with the default of 2 seconds",
+      "message": "Test timed out",
+      "properties": {}
+    },
+    {
+      "status_string": "PASS",
+      "name": "window onload event fires when set from the handler",
+      "message": null,
+      "properties": {}
+    },
+    {
+      "status_string": "PASS",
+      "name": "on_event does not use event capture",
+      "message": null,
+      "properties": {}
+    }
+  ],
+  "summarized_asserts": [
+    {
+      "assert_name": "assert_true",
+      "test": "Setup function ran",
+      "args": [
+        "true"
+      ],
+      "status": 0
+    },
+    {
+      "assert_name": "assert_array_equals",
+      "test": "on_event does not use event capture",
+      "args": [
+        "[\"inner\", \"outer\"]",
+        "[\"inner\", \"outer\"]"
+      ],
+      "status": 0
+    },
+    {
+      "assert_name": "assert_equals",
+      "test": "document.body should be the first body element in the document",
+      "args": [
+        "Element node <body onload=\"load_test_attr.done()\"> <h1>Sample HTML5 AP...",
+        "Element node <body onload=\"load_test_attr.done()\"> <h1>Sample HTML5 AP..."
+      ],
+      "status": 0
+    },
+    {
+      "assert_name": "assert_equals",
+      "test": "assert_equals tests",
+      "args": [
+        "1",
+        "1"
+      ],
+      "status": 0
+    },
+    {
+      "assert_name": "assert_equals",
+      "test": "assert_equals tests",
+      "args": [
+        "NaN",
+        "NaN",
+        "\"NaN case\""
+      ],
+      "status": 0
+    },
+    {
+      "assert_name": "assert_equals",
+      "test": "assert_equals tests",
+      "args": [
+        "0",
+        "0",
+        "\"Zero case\""
+      ],
+      "status": 0
+    },
+    {
+      "assert_name": "assert_equals",
+      "test": "assert_equals tests expected to fail",
+      "args": [
+        "-0",
+        "0",
+        "\"Zero case\""
+      ],
+      "status": 1
+    },
+    {
+      "assert_name": "assert_not_equals",
+      "test": "assert_not_equals tests",
+      "args": [
+        "object \"[object Object]\"",
+        "object \"[object Object]\"",
+        "\"object case\""
+      ],
+      "status": 0
+    },
+    {
+      "assert_name": "assert_not_equals",
+      "test": "assert_not_equals tests",
+      "args": [
+        "-0",
+        "0",
+        "\"Zero case\""
+      ],
+      "status": 0
+    },
+    {
+      "assert_name": "assert_true",
+      "test": "assert_true expected to pass",
+      "args": [
+        "true"
+      ],
+      "status": 0
+    },
+    {
+      "assert_name": "assert_true",
+      "test": "assert_true expected to fail",
+      "args": [
+        "false",
+        "\"false should not be true\""
+      ],
+      "status": 1
+    },
+    {
+      "assert_name": "assert_array_equals",
+      "test": "basic assert_array_equals test",
+      "args": [
+        "[1, NaN]",
+        "[1, NaN]",
+        "\"[1, NaN] is equal to [1, NaN]\""
+      ],
+      "status": 0
+    },
+    {
+      "assert_name": "assert_array_equals",
+      "test": "assert_array_equals with first param undefined",
+      "args": [
+        "undefined",
+        "[1]",
+        "\"undefined equals [1]?\""
+      ],
+      "status": 1
+    },
+    {
+      "assert_name": "assert_array_equals",
+      "test": "assert_array_equals with first param true",
+      "args": [
+        "true",
+        "[1]",
+        "\"true equals [1]?\""
+      ],
+      "status": 1
+    },
+    {
+      "assert_name": "assert_array_equals",
+      "test": "assert_array_equals with first param false",
+      "args": [
+        "false",
+        "[1]",
+        "\"false equals [1]?\""
+      ],
+      "status": 1
+    },
+    {
+      "assert_name": "assert_array_equals",
+      "test": "assert_array_equals with first param null",
+      "args": [
+        "null",
+        "[1]",
+        "\"null equals [1]?\""
+      ],
+      "status": 1
+    },
+    {
+      "assert_name": "assert_array_equals",
+      "test": "assert_array_equals with first param 1",
+      "args": [
+        "1",
+        "[1]",
+        "\"1 equals [1]?\""
+      ],
+      "status": 1
+    },
+    {
+      "assert_name": "assert_array_approx_equals",
+      "test": "basic assert_array_approx_equals test",
+      "args": [
+        "[10, 11]",
+        "[11, 10]",
+        "1",
+        "\"[10, 11] is approximately (+/- 1) [11, 10]\""
+      ],
+      "status": 0
+    },
+    {
+      "assert_name": "assert_approx_equals",
+      "test": "basic assert_approx_equals test",
+      "args": [
+        "10",
+        "11",
+        "1",
+        "\"10 is approximately (+/- 1) 11\""
+      ],
+      "status": 0
+    },
+    {
+      "assert_name": "assert_approx_equals",
+      "test": "basic assert_less_than test",
+      "args": [
+        "10",
+        "11",
+        "1",
+        "\"10 is approximately (+/- 1) 11\""
+      ],
+      "status": 0
+    },
+    {
+      "assert_name": "assert_greater_than",
+      "test": "assert_greater_than expected to fail",
+      "args": [
+        "10",
+        "11",
+        "\"10 is not greater than 11\""
+      ],
+      "status": 1
+    },
+    {
+      "assert_name": "assert_greater_than_equal",
+      "test": "basic assert_greater_than_equal test",
+      "args": [
+        "10",
+        "10",
+        "\"10 is greater than or equal to 10\""
+      ],
+      "status": 0
+    },
+    {
+      "assert_name": "assert_greater_than_equal",
+      "test": "assert_less_than_equal expected to fail",
+      "args": [
+        "\"10\"",
+        "10",
+        "\"'10' is not a number\""
+      ],
+      "status": 1
+    },
+    {
+      "assert_name": "assert_own_property",
+      "test": "test for assert[_not]_own_property and insert_inherits",
+      "args": [
+        "object \"[object Object]\"",
+        "\"a\""
+      ],
+      "status": 0
+    },
+    {
+      "assert_name": "assert_not_own_property",
+      "test": "test for assert[_not]_own_property and insert_inherits",
+      "args": [
+        "object \"[object Object]\"",
+        "\"b\"",
+        "\"unexpected property found: \\\"b\\\"\""
+      ],
+      "status": 0
+    },
+    {
+      "assert_name": "assert_inherits",
+      "test": "test for assert[_not]_own_property and insert_inherits",
+      "args": [
+        "object \"[object Object]\"",
+        "\"b\""
+      ],
+      "status": 0
+    },
+    {
+      "assert_name": "assert_throws_dom",
+      "test": "Test throw DOM exception",
+      "args": [
+        "\"NOT_FOUND_ERR\"",
+        "function \"function () {a.removeChild(b)}\""
+      ],
+      "status": 0
+    },
+    {
+      "assert_name": "assert_throws_js",
+      "test": "Test throw DOMException as JS exception expected to fail",
+      "args": [
+        "function \"function DOMException() {     [native code] }\"",
+        "function \"function () {a.removeChild(b)}\""
+      ],
+      "status": 1
+    },
+    {
+      "assert_name": "assert_throws_js",
+      "test": "Test throw SyntaxError DOMException where JS SyntaxError expected; expected to fail",
+      "args": [
+        "function \"function SyntaxError() {     [native code] }\"",
+        "function \"function () {document.querySelector(\"\")}\""
+      ],
+      "status": 1
+    },
+    {
+      "assert_name": "assert_throws_js",
+      "test": "Test throw JS SyntaxError",
+      "args": [
+        "function \"function SyntaxError() {     [native code] }\"",
+        "function \"function () {JSON.parse(\"{\")}\""
+      ],
+      "status": 0
+    },
+    {
+      "assert_name": "assert_throws_dom",
+      "test": "Test throw DOM SyntaxError",
+      "args": [
+        "\"SyntaxError\"",
+        "function \"function () {document.querySelector(\"\")}\""
+      ],
+      "status": 0
+    },
+    {
+      "assert_name": "assert_throws_dom",
+      "test": "Test throw DOM SyntaxError from subframe",
+      "args": [
+        "\"SyntaxError\"",
+        "function \"function DOMException() {     [native code] }\"",
+        "function \"function () {ifr.contentDocument.querySelector(\"\")}\""
+      ],
+      "status": 0
+    },
+    {
+      "assert_name": "assert_throws_dom",
+      "test": "Test throw DOM SyntaxError from subframe with incorrect global expectation; expected to fail",
+      "args": [
+        "\"SyntaxError\"",
+        "function \"function () {ifr.contentDocument.querySelector(\"\")}\""
+      ],
+      "status": 1
+    },
+    {
+      "assert_name": "assert_throws_dom",
+      "test": "Test throw DOM SyntaxError with incorrect expectation; expected to fail",
+      "args": [
+        "\"SyntaxError\"",
+        "function \"function DOMException() {     [native code] }\"",
+        "function \"function () {document.querySelector(\"\")}\""
+      ],
+      "status": 1
+    },
+    {
+      "assert_name": "assert_throws_dom",
+      "test": "Test throw JS SyntaxError where SyntaxError DOMException expected; expected to fail",
+      "args": [
+        "\"SyntaxError\"",
+        "function \"function () {JSON.parse(\"{\")}\""
+      ],
+      "status": 1
+    },
+    {
+      "assert_name": "assert_throws_dom",
+      "test": "Test throw DOM exception expected to fail",
+      "args": [
+        "\"NOT_FOUND_ERR\"",
+        "function \"function () {a.appendChild(b)}\""
+      ],
+      "status": 1
+    },
+    {
+      "assert_name": "assert_throws_dom",
+      "test": "Test assert_throws_dom with ambiguous DOM-exception expected to Fail",
+      "args": [
+        "0",
+        "function \"function() {throw e}\""
+      ],
+      "status": 1
+    },
+    {
+      "assert_name": "assert_throws_dom",
+      "test": "Test assert_throws_dom with non-DOM-exception expected to Fail",
+      "args": [
+        "\"TEST_ERR\"",
+        "function \"function() {throw e}\""
+      ],
+      "status": 1
+    },
+    {
+      "assert_name": "assert_throws_dom",
+      "test": "Test assert_throws_dom with number code value expected to Pass",
+      "args": [
+        "12",
+        "function \"function() {throw e}\""
+      ],
+      "status": 0
+    },
+    {
+      "assert_name": "assert_throws_dom",
+      "test": "Test assert_throws_dom with number code value and real DOMException expected to Pass",
+      "args": [
+        "12",
+        "function \"function() {throw e}\""
+      ],
+      "status": 0
+    },
+    {
+      "assert_name": "assert_equals",
+      "test": "Test that defines a global and cleans it up",
+      "args": [
+        "1",
+        "1"
+      ],
+      "status": 0
+    },
+    {
+      "assert_name": "assert_equals",
+      "test": "Test that cleanup handlers from previous test ran",
+      "args": [
+        "undefined",
+        "undefined"
+      ],
+      "status": 0
+    },
+    {
+      "assert_name": "assert_true",
+      "test": "Test step_func",
+      "args": [
+        "true"
+      ],
+      "status": 0
+    },
+    {
+      "assert_name": "assert_true",
+      "test": "Test async test with callback",
+      "args": [
+        "true"
+      ],
+      "status": 0
+    },
+    {
+      "assert_name": "assert_true",
+      "test": "Test async test with callback and `this` obj.",
+      "args": [
+        "true"
+      ],
+      "status": 0
+    }
+  ],
+  "type": "complete"
+}
+</script>
+</body>
+</html>
diff --git a/test/wpt/tests/resources/test/tests/functional/api-tests-2.html b/test/wpt/tests/resources/test/tests/functional/api-tests-2.html
new file mode 100644
index 00000000000..9af94f61acd
--- /dev/null
+++ b/test/wpt/tests/resources/test/tests/functional/api-tests-2.html
@@ -0,0 +1,62 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+<title>Sample HTML5 API Tests</title>
+</head>
+<body>
+<h1>Sample HTML5 API Tests</h1>
+<p>There should be two results</p>
+<div id="log"></div>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script>
+setup({explicit_done:true})
+test(function() {assert_true(true)}, "Test defined before onload");
+
+onload = function() {test(function (){assert_true(true)}, "Test defined after onload");
+done();
+}
+</script>
+<script type="text/json" id="expected">
+{
+  "summarized_status": {
+    "status_string": "OK",
+    "message": null
+  },
+  "summarized_tests": [
+    {
+      "status_string": "PASS",
+      "name": "Test defined after onload",
+      "properties": {},
+      "message": null
+    },
+    {
+      "status_string": "PASS",
+      "name": "Test defined before onload",
+      "properties": {},
+      "message": null
+    }
+  ],
+  "summarized_asserts": [
+    {
+      "assert_name": "assert_true",
+      "test": "Test defined before onload",
+      "args": [
+        "true"
+      ],
+      "status": 0
+    },
+    {
+      "assert_name": "assert_true",
+      "test": "Test defined after onload",
+      "args": [
+        "true"
+      ],
+      "status": 0
+    }
+  ],
+  "type": "complete"
+}
+</script>
+</body>
+</html>
diff --git a/test/wpt/tests/resources/test/tests/functional/api-tests-3.html b/test/wpt/tests/resources/test/tests/functional/api-tests-3.html
new file mode 100644
index 00000000000..991fc6da670
--- /dev/null
+++ b/test/wpt/tests/resources/test/tests/functional/api-tests-3.html
@@ -0,0 +1,34 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+<title>Sample HTML5 API Tests</title>
+</head>
+<script src="/resources/testharness.js"></script>
+
+<body>
+<h1>Sample HTML5 API Tests</h1>
+<div id="log"></div>
+<script>
+setup({explicit_timeout:true});
+var t = async_test("This test should give a status of 'Not Run' without a delay");
+timeout();
+</script>
+<script type="text/json" id="expected">
+{
+  "summarized_status": {
+    "status_string": "TIMEOUT",
+    "message": null
+  },
+  "summarized_tests": [
+    {
+      "status_string": "NOTRUN",
+      "name": "This test should give a status of 'Not Run' without a delay",
+      "properties": {},
+      "message": null
+    }
+  ],
+  "type": "complete"
+}
+</script>
+</body>
+</html>
diff --git a/test/wpt/tests/resources/test/tests/functional/assert-array-equals.html b/test/wpt/tests/resources/test/tests/functional/assert-array-equals.html
new file mode 100644
index 00000000000..b6460a48688
--- /dev/null
+++ b/test/wpt/tests/resources/test/tests/functional/assert-array-equals.html
@@ -0,0 +1,162 @@
+<!DOCTYPE HTML>
+<title>assert_array_equals</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<div id="log"></div>
+<script>
+test(() => {
+  assert_array_equals([], []);
+}, "empty and equal");
+test(() => {
+  assert_array_equals([1], [1]);
+}, "non-empty and equal");
+test(() => {
+  assert_array_equals([], [1]);
+}, "length differs");
+test(() => {
+  assert_array_equals([1], [,]);
+}, "property is present");
+test(() => {
+  assert_array_equals([,], [1]);
+}, "property is missing");
+test(() => {
+  assert_array_equals([0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20], ["x",1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20]);
+}, "property 0 differs");
+test(() => {
+  assert_array_equals([0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20], [0,1,2,3,4,"x",6,7,8,9,10,11,12,13,14,15,16,17,18,19,20]);
+}, "property 5 differs");
+test(() => {
+  assert_array_equals([0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21], [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21]);
+}, "lengths differ and input array beyond display limit");
+test(() => {
+  assert_array_equals([1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21], [0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21]);
+}, "lengths differ and expected array beyond display limit");
+test(() => {
+  assert_array_equals([0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21], [,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21]);
+}, "property 0 is present and arrays are beyond display limit");
+test(() => {
+  assert_array_equals([,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21], [0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21]);
+}, "property 0 is missing and arrays are beyond display limit");
+test(() => {
+  assert_array_equals([0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21], [0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,,19,20,21]);
+}, "property 18 is present and arrays are beyond display limit");
+test(() => {
+  assert_array_equals([0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,,19,20,21], [0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21]);
+}, "property 18 is missing and arrays are beyond display limit");
+test(() => {
+  assert_array_equals([0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21], ["x",1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21]);
+}, "property 0 differs and arrays are beyond display limit");
+test(() => {
+  assert_array_equals([0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21], [0,1,2,3,4,"x",6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21]);
+}, "property 5 differs and arrays are beyond display limit");
+test(() => {
+  assert_array_equals([0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26], [0,1,2,3,4,5,6,7,8,9,10,11,"x",13,14,15,16,17,18,19,20,21,22,23,24,25,26]);
+}, "property 5 differs and arrays are beyond display limit on both sides");
+</script>
+<script type="text/json" id="expected">
+{
+  "type": "complete",
+  "summarized_status": {
+    "message": null,
+    "status_string": "OK"
+  },
+  "summarized_tests": [
+    {
+      "name": "empty and equal",
+      "message": null,
+      "properties": {},
+      "status_string": "PASS"
+    },
+    {
+      "name": "length differs",
+      "message": "assert_array_equals: lengths differ, expected array [1] length 1, got [] length 0",
+      "properties": {},
+      "status_string": "FAIL"
+    },
+    {
+      "name": "lengths differ and expected array beyond display limit",
+      "message": "assert_array_equals: lengths differ, expected array [\u2026, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21] length 22, got [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21] length 21",
+      "properties": {},
+      "status_string": "FAIL"
+    },
+    {
+      "name": "lengths differ and input array beyond display limit",
+      "message": "assert_array_equals: lengths differ, expected array [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21] length 21, got [\u2026, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21] length 22",
+      "properties": {},
+      "status_string": "FAIL"
+    },
+    {
+      "name": "non-empty and equal",
+      "message": null,
+      "properties": {},
+      "status_string": "PASS"
+    },
+    {
+      "name": "property 0 differs",
+      "message": "assert_array_equals: expected property 0 to be \"x\" but got 0 (expected array [\"x\", 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20] got [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20])",
+      "properties": {},
+      "status_string": "FAIL"
+    },
+    {
+      "name": "property 0 differs and arrays are beyond display limit",
+      "message": "assert_array_equals: expected property 0 to be \"x\" but got 0 (expected array [\"x\", 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, \u2026] got [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, \u2026])",
+      "properties": {},
+      "status_string": "FAIL"
+    },
+    {
+      "name": "property 0 is missing and arrays are beyond display limit",
+      "message": "assert_array_equals: expected property 0 to be \"present\" but was \"missing\" (expected array [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, \u2026] got [, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, \u2026])",
+      "properties": {},
+      "status_string": "FAIL"
+    },
+    {
+      "name": "property 0 is present and arrays are beyond display limit",
+      "message": "assert_array_equals: expected property 0 to be \"missing\" but was \"present\" (expected array [, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, \u2026] got [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, \u2026])",
+      "properties": {},
+      "status_string": "FAIL"
+    },
+    {
+      "name": "property 18 is missing and arrays are beyond display limit",
+      "message": "assert_array_equals: expected property 18 to be \"present\" but was \"missing\" (expected array [\u2026, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21] got [\u2026, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, , 19, 20, 21])",
+      "properties": {},
+      "status_string": "FAIL"
+    },
+    {
+      "name": "property 18 is present and arrays are beyond display limit",
+      "message": "assert_array_equals: expected property 18 to be \"missing\" but was \"present\" (expected array [\u2026, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, , 19, 20, 21] got [\u2026, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21])",
+      "properties": {},
+      "status_string": "FAIL"
+    },
+    {
+      "name": "property 5 differs",
+      "message": "assert_array_equals: expected property 5 to be \"x\" but got 5 (expected array [0, 1, 2, 3, 4, \"x\", 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20] got [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20])",
+      "properties": {},
+      "status_string": "FAIL"
+    },
+    {
+      "name": "property 5 differs and arrays are beyond display limit",
+      "message": "assert_array_equals: expected property 5 to be \"x\" but got 5 (expected array [0, 1, 2, 3, 4, \"x\", 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, \u2026] got [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, \u2026])",
+      "properties": {},
+      "status_string": "FAIL"
+    },
+    {
+      "name": "property 5 differs and arrays are beyond display limit on both sides",
+      "message": "assert_array_equals: expected property 12 to be \"x\" but got 12 (expected array [\u2026, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, \"x\", 13, 14, 15, 16, 17, 18, 19, 20, 21, \u2026] got [\u2026, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, \u2026])",
+      "properties": {},
+      "status_string": "FAIL"
+    },
+    {
+      "name": "property is missing",
+      "message": "assert_array_equals: expected property 0 to be \"present\" but was \"missing\" (expected array [1] got [])",
+      "properties": {},
+      "status_string": "FAIL"
+    },
+    {
+      "name": "property is present",
+      "message": "assert_array_equals: expected property 0 to be \"missing\" but was \"present\" (expected array [] got [1])",
+      "properties": {},
+      "status_string": "FAIL"
+    }
+  ]
+}
+</script>
diff --git a/test/wpt/tests/resources/test/tests/functional/force_timeout.html b/test/wpt/tests/resources/test/tests/functional/force_timeout.html
new file mode 100644
index 00000000000..2058fdb8621
--- /dev/null
+++ b/test/wpt/tests/resources/test/tests/functional/force_timeout.html
@@ -0,0 +1,60 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+<title>Test#force_timeout</title>
+</head>
+<body>
+<h1>Test#force_timeout</h1>
+<div id="log"></div>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script>
+setup({ explicit_timeout: true });
+
+test(function(t) {
+    t.force_timeout();
+  }, 'test (synchronous)');
+
+async_test(function(t) {
+    t.step_timeout(function() {
+        t.force_timeout();
+      }, 0);
+  }, 'async_test');
+
+promise_test(function(t) {
+    t.force_timeout();
+
+    return new Promise(function() {});
+  }, 'promise_test');
+</script>
+<script type="text/json" id="expected">
+{
+  "summarized_status": {
+    "status_string": "OK",
+    "message": null
+  },
+  "summarized_tests": [
+    {
+      "status_string": "TIMEOUT",
+      "name": "async_test",
+      "message": "Test timed out",
+      "properties": {}
+    },
+    {
+      "status_string": "TIMEOUT",
+      "name": "promise_test",
+      "message": "Test timed out",
+      "properties": {}
+    },
+    {
+      "status_string": "TIMEOUT",
+      "name": "test (synchronous)",
+      "message": "Test timed out",
+      "properties": {}
+    }
+  ],
+  "type": "complete"
+}
+</script>
+</body>
+</html>
diff --git a/test/wpt/tests/resources/test/tests/functional/generate-callback.html b/test/wpt/tests/resources/test/tests/functional/generate-callback.html
new file mode 100644
index 00000000000..11d41743b3e
--- /dev/null
+++ b/test/wpt/tests/resources/test/tests/functional/generate-callback.html
@@ -0,0 +1,153 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+<title>Sample for using generate_tests to create a series of tests that share the same callback.</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+</head>
+<body>
+<script>
+// generate_tests takes an array of arrays that define tests
+// but lets pass it an empty array and verify it does nothing.
+function null_callback() {
+  throw "null_callback should not be called.";
+}
+generate_tests(null_callback, []);
+
+// Generate 3 tests specifying the name and one parameter
+function validate_arguments(arg1) {
+  assert_equals(arg1, 1, "Ensure that we get our expected argument");
+}
+generate_tests(validate_arguments, [
+  ["first test", 1],
+  ["second test", 1],
+  ["third test", 1],
+]);
+
+// Generate a test passing in a properties object that is shared across tests.
+function validate_properties() {
+  assert_true(this.properties.sentinel, "Ensure that we got the right properties object.");
+}
+generate_tests(validate_properties, [["sentinel check 1"], ["sentinel check 2"]], {sentinel: true});
+
+// Generate a test passing in a properties object that is shared across tests.
+function validate_separate_properties() {
+  if (this.name === "sentinel check 1 unique properties") {
+    assert_true(this.properties.sentinel, "Ensure that we got the right properties object. Expect sentinel: true.");
+  }
+  else {
+    assert_false(this.properties.sentinel, "Ensure that we got the right properties object. Expect sentinel: false.");
+  }
+}
+generate_tests(validate_separate_properties, [["sentinel check 1 unique properties"], ["sentinel check 2 unique properties"]], [{sentinel: true}, {sentinel: false}]);
+
+// Finally generate a complicated set of tests from another data source
+var letters = ["a", "b", "c", "d", "e", "f"];
+var numbers = [0, 1, 2, 3, 4, 5];
+function validate_related_arguments(arg1, arg2) {
+  assert_equals(arg1.charCodeAt(0) - "a".charCodeAt(0), arg2, "Ensure that we can map letters to numbers.");
+}
+function format_as_test(letter, index, letters) {
+  return ["Test to map " + letter + " to " + numbers[index], letter, numbers[index]];
+}
+generate_tests(validate_related_arguments, letters.map(format_as_test));
+</script>
+<script type="text/json" id="expected">
+{
+  "summarized_status": {
+    "status_string": "OK",
+    "message": null
+  },
+  "summarized_tests": [
+    {
+      "status_string": "PASS",
+      "name": "Test to map a to 0",
+      "properties": {},
+      "message": null
+    },
+    {
+      "status_string": "PASS",
+      "name": "Test to map b to 1",
+      "properties": {},
+      "message": null
+    },
+    {
+      "status_string": "PASS",
+      "name": "Test to map c to 2",
+      "properties": {},
+      "message": null
+    },
+    {
+      "status_string": "PASS",
+      "name": "Test to map d to 3",
+      "properties": {},
+      "message": null
+    },
+    {
+      "status_string": "PASS",
+      "name": "Test to map e to 4",
+      "properties": {},
+      "message": null
+    },
+    {
+      "status_string": "PASS",
+      "name": "Test to map f to 5",
+      "properties": {},
+      "message": null
+    },
+    {
+      "status_string": "PASS",
+      "name": "first test",
+      "properties": {},
+      "message": null
+    },
+    {
+      "status_string": "PASS",
+      "name": "second test",
+      "properties": {},
+      "message": null
+    },
+    {
+      "status_string": "PASS",
+      "name": "sentinel check 1",
+      "properties": {
+        "sentinel": true
+      },
+      "message": null
+    },
+    {
+      "status_string": "PASS",
+      "name": "sentinel check 1 unique properties",
+      "properties": {
+        "sentinel": true
+      },
+      "message": null
+    },
+    {
+      "status_string": "PASS",
+      "name": "sentinel check 2",
+      "properties": {
+        "sentinel": true
+      },
+      "message": null
+    },
+    {
+      "status_string": "PASS",
+      "name": "sentinel check 2 unique properties",
+      "properties": {
+        "sentinel": false
+      },
+      "message": null
+    },
+    {
+      "status_string": "PASS",
+      "name": "third test",
+      "properties": {},
+      "message": null
+    }
+  ],
+  "type": "complete"
+}
+</script>
+</body>
+</html>
diff --git a/test/wpt/tests/resources/test/tests/functional/idlharness/IdlDictionary/test_partial_interface_of.html b/test/wpt/tests/resources/test/tests/functional/idlharness/IdlDictionary/test_partial_interface_of.html
new file mode 100644
index 00000000000..05e6e0b1e06
--- /dev/null
+++ b/test/wpt/tests/resources/test/tests/functional/idlharness/IdlDictionary/test_partial_interface_of.html
@@ -0,0 +1,90 @@
+<!DOCTYPE HTML>
+<html>
+
+<head>
+  <meta charset="utf-8">
+  <meta name="variant" content="">
+  <title>idlharness: Partial dictionary</title>
+  <script src="/resources/test/variants.js"></script>
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  <script src="/resources/WebIDLParser.js"></script>
+  <script src="/resources/idlharness.js"></script>
+</head>
+
+<body>
+  <p>Verify the series of sub-tests that are executed for "partial" dictionary objects.</p>
+  <script>
+    "use strict";
+
+    // No original existence
+    (() => {
+      const idlArray = new IdlArray();
+      idlArray.add_idls('partial dictionary A {};');
+      idlArray.test();
+    })();
+
+    // Multiple partials existence
+    (() => {
+      const idlArray = new IdlArray();
+      idlArray.add_untested_idls('partial dictionary B {};');
+      idlArray.add_idls('partial dictionary B {};');
+      idlArray.add_idls('partial dictionary B {};');
+      idlArray.add_idls('partial dictionary B {};');
+      idlArray.add_idls('dictionary B {};');
+      idlArray.test();
+    })();
+
+    // Original is a namespace, not a dictionary.
+    (() => {
+      const idlArray = new IdlArray();
+      idlArray.add_idls(`
+        partial dictionary C {};
+        namespace C {};`);
+      idlArray.merge_partials();
+    })();
+  </script>
+  <script type="text/json" id="expected">
+{
+  "summarized_status": {
+    "status_string": "OK",
+    "message": null
+  },
+  "summarized_tests": [
+    {
+      "name": "Partial dictionary A: original dictionary defined",
+      "status_string": "FAIL",
+      "properties": {},
+      "message": "assert_true: Original dictionary should be defined expected true got false"
+    },
+    {
+      "name": "Partial dictionary B[2]: original dictionary defined",
+      "status_string": "PASS",
+      "properties": {},
+      "message": null
+    },
+    {
+      "name": "Partial dictionary B[3]: original dictionary defined",
+      "status_string": "PASS",
+      "properties": {},
+      "message": null
+    },
+    {
+      "name": "Partial dictionary B[4]: original dictionary defined",
+      "status_string": "PASS",
+      "properties": {},
+      "message": null
+    },
+    {
+      "name": "Partial dictionary C: original dictionary defined",
+      "status_string": "FAIL",
+      "properties": {},
+      "message": "assert_true: Original C definition should have type dictionary expected true got false"
+    }
+  ],
+  "type": "complete"
+}
+</script>
+</body>
+
+</html>
diff --git a/test/wpt/tests/resources/test/tests/functional/idlharness/IdlInterface/test_exposed_wildcard.html b/test/wpt/tests/resources/test/tests/functional/idlharness/IdlInterface/test_exposed_wildcard.html
new file mode 100644
index 00000000000..addc0eb4fc4
--- /dev/null
+++ b/test/wpt/tests/resources/test/tests/functional/idlharness/IdlInterface/test_exposed_wildcard.html
@@ -0,0 +1,233 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <meta charset="utf-8">
+  <title>idlharness: Exposed=*</title>
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  <script src="/resources/WebIDLParser.js"></script>
+  <script src="/resources/idlharness.js"></script>
+</head>
+<body>
+<script>
+"use strict";
+
+Object.defineProperty(window, "A", {
+    enumerable: false,
+    writable: true,
+    configurable: true,
+    value: function A() {}
+  });
+Object.defineProperty(window.A, "prototype", {
+    writable: false,
+    value: window.A.prototype
+  });
+A.prototype[Symbol.toStringTag] = "A";
+
+Object.defineProperty(window, "C", {
+    enumerable: false,
+    writable: true,
+    configurable: true,
+    value: function C() {}
+  });
+Object.defineProperty(window.C, "prototype", {
+    writable: false,
+    value: window.C.prototype
+  });
+C.prototype[Symbol.toStringTag] = "C";
+
+Object.defineProperty(window, "D", {
+    enumerable: false,
+    writable: true,
+    configurable: true,
+    value: function D() {}
+  });
+Object.defineProperty(window.D, "prototype", {
+    writable: false,
+    value: window.D.prototype
+  });
+C.prototype[Symbol.toStringTag] = "D";
+Object.defineProperty(window, "B", {
+    enumerable: false,
+    writable: true,
+    configurable: true,
+    value: window.A
+  });
+
+var idlArray = new IdlArray();
+idlArray.add_idls(`
+[Exposed=*, LegacyWindowAlias=B] interface A {};
+[Exposed=*] partial interface A {};
+[Exposed=Window] interface C {};
+[Exposed=*] partial interface C {};
+[Exposed=*] interface D {};
+[Exposed=Window] partial interface D {};
+`);
+idlArray.add_objects({
+  Window: ["window"]
+});
+idlArray.test();
+</script>
+<script type="text/json" id="expected">
+{
+    "summarized_status": {
+        "message": null,
+        "status_string": "OK"
+    },
+    "summarized_tests": [
+        {
+            "name": "A interface object length",
+            "properties": {},
+            "message": null,
+            "status_string": "PASS"
+        },
+        {
+            "name": "A interface object name",
+            "properties": {},
+            "message": null,
+            "status_string": "PASS"
+        },
+        {
+            "name": "A interface: existence and properties of interface object",
+            "properties": {},
+            "message": "assert_throws_js: interface object didn't throw TypeError when called as a function function \"function() {\n            interface_object();\n        }\" did not throw",
+            "status_string": "FAIL"
+        },
+        {
+            "name": "A interface: existence and properties of interface prototype object",
+            "properties": {},
+            "message": null,
+            "status_string": "PASS"
+        },
+        {
+            "name": "A interface: existence and properties of interface prototype object's \"constructor\" property",
+            "properties": {},
+            "message": null,
+            "status_string": "PASS"
+        },
+        {
+            "name": "A interface: existence and properties of interface prototype object's @@unscopables property",
+            "properties": {},
+            "message": null,
+            "status_string": "PASS"
+        },
+        {
+            "name": "A interface: legacy window alias",
+            "properties": {},
+            "message": null,
+            "status_string": "PASS"
+        },
+        {
+            "name": "C interface object length",
+            "properties": {},
+            "message": null,
+            "status_string": "PASS"
+        },
+        {
+            "name": "C interface object name",
+            "properties": {},
+            "message": null,
+            "status_string": "PASS"
+        },
+        {
+            "name": "C interface: existence and properties of interface object",
+            "properties": {},
+            "message": "assert_throws_js: interface object didn't throw TypeError when called as a function function \"function() {\n            interface_object();\n        }\" did not throw",
+            "status_string": "FAIL"
+        },
+        {
+            "name": "C interface: existence and properties of interface prototype object",
+            "properties": {},
+            "message": null,
+            "status_string": "PASS"
+        },
+        {
+            "name": "C interface: existence and properties of interface prototype object's \"constructor\" property",
+            "properties": {},
+            "message": null,
+            "status_string": "PASS"
+        },
+        {
+            "name": "C interface: existence and properties of interface prototype object's @@unscopables property",
+            "properties": {},
+            "message": null,
+            "status_string": "PASS"
+        },
+        {
+            "name": "D interface object length",
+            "properties": {},
+            "message": null,
+            "status_string": "PASS"
+        },
+        {
+            "name": "D interface object name",
+            "properties": {},
+            "message": null,
+            "status_string": "PASS"
+        },
+        {
+            "name": "D interface: existence and properties of interface object",
+            "properties": {},
+            "message": "assert_throws_js: interface object didn't throw TypeError when called as a function function \"function() {\n            interface_object();\n        }\" did not throw",
+            "status_string": "FAIL"
+        },
+        {
+            "name": "D interface: existence and properties of interface prototype object",
+            "properties": {},
+            "message": null,
+            "status_string": "PASS"
+        },
+        {
+            "name": "D interface: existence and properties of interface prototype object's \"constructor\" property",
+            "properties": {},
+            "message": null,
+            "status_string": "PASS"
+        },
+        {
+            "name": "D interface: existence and properties of interface prototype object's @@unscopables property",
+            "properties": {},
+            "message": null,
+            "status_string": "PASS"
+        },
+        {
+            "name": "Partial interface A: original interface defined",
+            "properties": {},
+            "message": null,
+            "status_string": "PASS"
+        },
+        {
+            "name": "Partial interface A: valid exposure set",
+            "properties": {},
+            "message": null,
+            "status_string": "PASS"
+        },
+        {
+            "name": "Partial interface C: original interface defined",
+            "properties": {},
+            "message": null,
+            "status_string": "PASS"
+        },
+        {
+            "name": "Partial interface C: valid exposure set",
+            "properties": {},
+            "message": "Partial C interface is exposed everywhere, the original interface is not.",
+            "status_string": "FAIL"
+        },
+        {
+            "name": "Partial interface D: original interface defined",
+            "properties": {},
+            "message": null,
+            "status_string": "PASS"
+        },
+        {
+            "name": "Partial interface D: valid exposure set",
+            "properties": {},
+            "message": null,
+            "status_string": "PASS"
+        }
+    ],
+    "type": "complete"
+}
+</script>
+</body>
+</html>
diff --git a/test/wpt/tests/resources/test/tests/functional/idlharness/IdlInterface/test_immutable_prototype.html b/test/wpt/tests/resources/test/tests/functional/idlharness/IdlInterface/test_immutable_prototype.html
new file mode 100644
index 00000000000..5fe05915b05
--- /dev/null
+++ b/test/wpt/tests/resources/test/tests/functional/idlharness/IdlInterface/test_immutable_prototype.html
@@ -0,0 +1,298 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <meta charset="utf-8">
+  <title>idlharness: Immutable prototypes</title>
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  <script src="/resources/WebIDLParser.js"></script>
+  <script src="/resources/idlharness.js"></script>
+</head>
+<body>
+<script>
+"use strict";
+
+Object.defineProperty(window, "Foo", {
+    enumerable: false,
+    writable: true,
+    configurable: true,
+    value: function Foo() {
+        if (!new.target) {
+            throw new TypeError('Foo() must be called with new');
+        }
+    }
+  });
+Object.defineProperty(window.Foo, "prototype", {
+    writable: false,
+    value: window.Foo.prototype
+  });
+Foo.prototype[Symbol.toStringTag] = "Foo";
+
+var idlArray = new IdlArray();
+idlArray.add_untested_idls("interface EventTarget {};");
+idlArray.add_idls(
+    "[Global=Window, Exposed=Window]\n" +
+    "interface Window : EventTarget {};\n" +
+
+    "[Global=Window, Exposed=Window]\n" +
+    "interface Foo { constructor(); };"
+  );
+idlArray.add_objects({
+  Foo: ["new Foo()"],
+  Window: ["window"]
+});
+idlArray.test();
+</script>
+<script type="text/json" id="expected">
+{
+    "summarized_status": {
+        "message": null,
+        "status_string": "OK"
+    },
+    "summarized_tests": [
+        {
+            "name": "Foo interface object length",
+            "status_string": "PASS",
+            "properties": {},
+            "message": null
+        },
+        {
+            "name": "Foo interface object name",
+            "status_string": "PASS",
+            "properties": {},
+            "message": null
+        },
+        {
+            "name": "Foo interface: existence and properties of interface object",
+            "status_string": "PASS",
+            "properties": {},
+            "message": null
+        },
+        {
+            "name": "Foo interface: existence and properties of interface prototype object",
+            "status_string": "PASS",
+            "properties": {},
+            "message": null
+        },
+        {
+            "name": "Foo interface: existence and properties of interface prototype object's \"constructor\" property",
+            "status_string": "PASS",
+            "properties": {},
+            "message": null
+        },
+        {
+            "name": "Foo interface: existence and properties of interface prototype object's @@unscopables property",
+            "status_string": "PASS",
+            "properties": {},
+            "message": null
+        },
+        {
+            "name": "Foo interface: internal [[SetPrototypeOf]] method of global platform object - setting to a new value via Object.setPrototypeOf should throw a TypeError",
+            "status_string": "FAIL",
+            "properties": {},
+            "message": "assert_throws_js: function \"function() {\n            Object.setPrototypeOf(obj, newValue);\n        }\" did not throw"
+        },
+        {
+            "name": "Foo interface: internal [[SetPrototypeOf]] method of global platform object - setting to a new value via Reflect.setPrototypeOf should return false",
+            "status_string": "FAIL",
+            "properties": {},
+            "message": "assert_false: expected false got true"
+        },
+        {
+            "name": "Foo interface: internal [[SetPrototypeOf]] method of global platform object - setting to a new value via __proto__ should throw a TypeError",
+            "status_string": "FAIL",
+            "properties": {},
+            "message": "assert_throws_js: function \"function() {\n            obj.__proto__ = newValue;\n        }\" did not throw"
+        },
+        {
+            "name": "Foo interface: internal [[SetPrototypeOf]] method of global platform object - setting to its original value via Object.setPrototypeOf should not throw",
+            "status_string": "PASS",
+            "properties": {},
+            "message": null
+        },
+        {
+            "name": "Foo interface: internal [[SetPrototypeOf]] method of global platform object - setting to its original value via Reflect.setPrototypeOf should return true",
+            "status_string": "PASS",
+            "properties": {},
+            "message": null
+        },
+        {
+            "name": "Foo interface: internal [[SetPrototypeOf]] method of global platform object - setting to its original value via __proto__ should not throw",
+            "status_string": "PASS",
+            "properties": {},
+            "message": null
+        },
+        {
+            "name": "Foo interface: internal [[SetPrototypeOf]] method of interface prototype object - setting to a new value via Object.setPrototypeOf should throw a TypeError",
+            "status_string": "FAIL",
+            "properties": {},
+            "message": "assert_throws_js: function \"function() {\n            Object.setPrototypeOf(obj, newValue);\n        }\" did not throw"
+        },
+        {
+            "name": "Foo interface: internal [[SetPrototypeOf]] method of interface prototype object - setting to a new value via Reflect.setPrototypeOf should return false",
+            "status_string": "FAIL",
+            "properties": {},
+            "message": "assert_false: expected false got true"
+        },
+        {
+            "name": "Foo interface: internal [[SetPrototypeOf]] method of interface prototype object - setting to a new value via __proto__ should throw a TypeError",
+            "status_string": "FAIL",
+            "properties": {},
+            "message": "assert_throws_js: function \"function() {\n            obj.__proto__ = newValue;\n        }\" did not throw"
+        },
+        {
+            "name": "Foo interface: internal [[SetPrototypeOf]] method of interface prototype object - setting to its original value via Object.setPrototypeOf should not throw",
+            "status_string": "PASS",
+            "properties": {},
+            "message": null
+        },
+        {
+            "name": "Foo interface: internal [[SetPrototypeOf]] method of interface prototype object - setting to its original value via Reflect.setPrototypeOf should return true",
+            "status_string": "PASS",
+            "properties": {},
+            "message": null
+        },
+        {
+            "name": "Foo interface: internal [[SetPrototypeOf]] method of interface prototype object - setting to its original value via __proto__ should not throw",
+            "status_string": "PASS",
+            "properties": {},
+            "message": null
+        },
+        {
+            "name": "Foo must be primary interface of new Foo()",
+            "status_string": "PASS",
+            "properties": {},
+            "message": null
+        },
+        {
+            "name": "Stringification of new Foo()",
+            "status_string": "PASS",
+            "properties": {},
+            "message": null
+        },
+        {
+            "name": "Stringification of window",
+            "status_string": "PASS",
+            "properties": {},
+            "message": null
+        },
+        {
+            "name": "Window interface object length",
+            "status_string": "PASS",
+            "properties": {},
+            "message": null
+        },
+        {
+            "name": "Window interface object name",
+            "status_string": "PASS",
+            "properties": {},
+            "message": null
+        },
+        {
+            "name": "Window interface: existence and properties of interface object",
+            "status_string": "PASS",
+            "properties": {},
+            "message": null
+        },
+        {
+            "name": "Window interface: existence and properties of interface prototype object",
+            "status_string": "PASS",
+            "properties": {},
+            "message": null
+        },
+        {
+            "name": "Window interface: existence and properties of interface prototype object's \"constructor\" property",
+            "status_string": "PASS",
+            "properties": {},
+            "message": null
+        },
+        {
+            "name": "Window interface: existence and properties of interface prototype object's @@unscopables property",
+            "status_string": "PASS",
+            "properties": {},
+            "message": null
+        },
+        {
+            "name": "Window interface: internal [[SetPrototypeOf]] method of global platform object - setting to a new value via Object.setPrototypeOf should throw a TypeError",
+            "status_string": "PASS",
+            "properties": {},
+            "message": null
+        },
+        {
+            "name": "Window interface: internal [[SetPrototypeOf]] method of global platform object - setting to a new value via Reflect.setPrototypeOf should return false",
+            "status_string": "PASS",
+            "properties": {},
+            "message": null
+        },
+        {
+            "name": "Window interface: internal [[SetPrototypeOf]] method of global platform object - setting to a new value via __proto__ should throw a TypeError",
+            "status_string": "PASS",
+            "properties": {},
+            "message": null
+        },
+        {
+            "name": "Window interface: internal [[SetPrototypeOf]] method of global platform object - setting to its original value via Object.setPrototypeOf should not throw",
+            "status_string": "PASS",
+            "properties": {},
+            "message": null
+        },
+        {
+            "name": "Window interface: internal [[SetPrototypeOf]] method of global platform object - setting to its original value via Reflect.setPrototypeOf should return true",
+            "status_string": "PASS",
+            "properties": {},
+            "message": null
+        },
+        {
+            "name": "Window interface: internal [[SetPrototypeOf]] method of global platform object - setting to its original value via __proto__ should not throw",
+            "status_string": "PASS",
+            "properties": {},
+            "message": null
+        },
+        {
+            "name": "Window interface: internal [[SetPrototypeOf]] method of interface prototype object - setting to a new value via Object.setPrototypeOf should throw a TypeError",
+            "status_string": "PASS",
+            "properties": {},
+            "message": null
+        },
+        {
+            "name": "Window interface: internal [[SetPrototypeOf]] method of interface prototype object - setting to a new value via Reflect.setPrototypeOf should return false",
+            "status_string": "PASS",
+            "properties": {},
+            "message": null
+        },
+        {
+            "name": "Window interface: internal [[SetPrototypeOf]] method of interface prototype object - setting to a new value via __proto__ should throw a TypeError",
+            "status_string": "PASS",
+            "properties": {},
+            "message": null
+        },
+        {
+            "name": "Window interface: internal [[SetPrototypeOf]] method of interface prototype object - setting to its original value via Object.setPrototypeOf should not throw",
+            "status_string": "PASS",
+            "properties": {},
+            "message": null
+        },
+        {
+            "name": "Window interface: internal [[SetPrototypeOf]] method of interface prototype object - setting to its original value via Reflect.setPrototypeOf should return true",
+            "status_string": "PASS",
+            "properties": {},
+            "message": null
+        },
+        {
+            "name": "Window interface: internal [[SetPrototypeOf]] method of interface prototype object - setting to its original value via __proto__ should not throw",
+            "status_string": "PASS",
+            "properties": {},
+            "message": null
+        },
+        {
+            "name": "Window must be primary interface of window",
+            "status_string": "PASS",
+            "properties": {},
+            "message": null
+        }
+    ],
+    "type": "complete"
+}
+</script>
+</body>
+</html>
diff --git a/test/wpt/tests/resources/test/tests/functional/idlharness/IdlInterface/test_interface_mixin.html b/test/wpt/tests/resources/test/tests/functional/idlharness/IdlInterface/test_interface_mixin.html
new file mode 100644
index 00000000000..be2844e6987
--- /dev/null
+++ b/test/wpt/tests/resources/test/tests/functional/idlharness/IdlInterface/test_interface_mixin.html
@@ -0,0 +1,131 @@
+<!DOCTYPE HTML>
+<html>
+
+<head>
+  <meta charset="utf-8">
+  <title>idlharness: interface mixins</title>
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  <script src="/resources/WebIDLParser.js"></script>
+  <script src="/resources/idlharness.js"></script>
+</head>
+
+<body>
+  <p>Verify the series of sub-tests that are executed for "interface mixin" objects.</p>
+  <script>
+    "use strict";
+
+    // Simple includes statement (valid)
+    (() => {
+      const idlArray = new IdlArray();
+      idlArray.add_idls(`
+        [Exposed=Window] interface I1 {};
+        interface mixin M1 { attribute any a1; };
+        I1 includes M1;`);
+      idlArray.merge_partials();
+      idlArray.merge_mixins();
+    })();
+
+    // Partial interface mixin (valid)
+    (() => {
+      const idlArray = new IdlArray();
+      idlArray.add_idls(`
+        [Exposed=Window] interface I2 {};
+        interface mixin M2 {};
+        partial interface mixin M2 { attribute any a2; };
+        I2 includes M2;`);
+      idlArray.merge_partials();
+      idlArray.merge_mixins();
+    })();
+
+    // Partial interface mixin without original mixin
+    (() => {
+      const idlArray = new IdlArray();
+      idlArray.add_idls('partial interface mixin M3 {};');
+      idlArray.merge_partials();
+      idlArray.merge_mixins();
+    })();
+
+    // Name clash between mixin and partial mixin
+    (() => {
+      const idlArray = new IdlArray();
+      idlArray.add_idls(`
+        interface mixin M4 { attribute any a4; };
+        partial interface mixin M4 { attribute any a4; };`);
+      idlArray.merge_partials();
+      idlArray.merge_mixins();
+    })();
+
+    // Name clash between interface and mixin
+    (() => {
+      const idlArray = new IdlArray();
+      idlArray.add_untested_idls(`
+        interface mixin M5 { attribute any a5; };
+        interface I5 { attribute any a5; };
+        I5 includes M5;`);
+      idlArray.merge_partials();
+      idlArray.merge_mixins();
+    })();
+  </script>
+  <script type="text/json" id="expected">
+{
+  "summarized_status": {
+    "status_string": "OK",
+    "message": null
+  },
+  "summarized_tests": [
+    {
+      "name": "I1 includes M1: member names are unique",
+      "status_string": "PASS",
+      "properties": {},
+      "message": null
+    },
+    {
+      "name": "I2 includes M2: member names are unique",
+      "status_string": "PASS",
+      "properties": {},
+      "message": null
+    },
+    {
+      "name": "I5 includes M5: member names are unique",
+      "status_string": "FAIL",
+      "properties": {},
+      "message": "assert_true: member a5 is unique expected true got false"
+    },
+    {
+      "name": "Partial interface mixin M2: member names are unique",
+      "status_string": "PASS",
+      "properties": {},
+      "message": null
+    },
+    {
+      "name": "Partial interface mixin M2: original interface mixin defined",
+      "status_string": "PASS",
+      "properties": {},
+      "message": null
+    },
+    {
+      "name": "Partial interface mixin M3: original interface mixin defined",
+      "status_string": "FAIL",
+      "properties": {},
+      "message": "assert_true: Original interface mixin should be defined expected true got false"
+    },
+    {
+      "name": "Partial interface mixin M4: member names are unique",
+      "status_string": "FAIL",
+      "properties": {},
+      "message": "assert_true: member a4 is unique expected true got false"
+    },
+    {
+      "name": "Partial interface mixin M4: original interface mixin defined",
+      "status_string": "PASS",
+      "properties": {},
+      "message": null
+    }
+  ],
+  "type": "complete"
+}
+</script>
+</body>
+
+</html>
diff --git a/test/wpt/tests/resources/test/tests/functional/idlharness/IdlInterface/test_partial_interface_of.html b/test/wpt/tests/resources/test/tests/functional/idlharness/IdlInterface/test_partial_interface_of.html
new file mode 100644
index 00000000000..671196cc5df
--- /dev/null
+++ b/test/wpt/tests/resources/test/tests/functional/idlharness/IdlInterface/test_partial_interface_of.html
@@ -0,0 +1,188 @@
+<!DOCTYPE HTML>
+<html>
+
+<head>
+  <meta charset="utf-8">
+  <meta name="variant" content="">
+  <title>idlharness: Partial interface</title>
+  <script src="/resources/test/variants.js"></script>
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  <script src="/resources/WebIDLParser.js"></script>
+  <script src="/resources/idlharness.js"></script>
+</head>
+
+<body>
+  <p>Verify the series of sub-tests that are executed for "partial" interface objects.</p>
+  <script>
+    "use strict";
+
+    // No original existence
+    (() => {
+      const idlArray = new IdlArray();
+      idlArray.add_idls('partial interface A {};');
+      idlArray.test();
+    })();
+
+    // Valid exposure (Note: Worker -> {Shared,Dedicated,Service}Worker)
+    (() => {
+      const idlArray = new IdlArray();
+      idlArray.add_untested_idls(`
+        [Exposed=(Worker)]
+        interface B {};
+
+        [Exposed=(DedicatedWorker, ServiceWorker, SharedWorker)]
+        interface C {};`);
+      idlArray.add_idls(`
+        [Exposed=(DedicatedWorker, ServiceWorker, SharedWorker)]
+        partial interface B {};
+
+        [Exposed=(Worker)]
+        partial interface C {};`);
+      idlArray.merge_partials();
+    })();
+
+    // Invalid exposure
+    (() => {
+      const idlArray = new IdlArray();
+      idlArray.add_untested_idls(`
+        [Exposed=(Window, ServiceWorker)]
+        interface D {};`);
+      idlArray.add_idls(`
+        [Exposed=(DedicatedWorker)]
+        partial interface D {};`);
+      idlArray.merge_partials();
+    })();
+
+    // Original is a namespace, not an interface.
+    (() => {
+      const idlArray = new IdlArray();
+      idlArray.add_idls(`
+        partial interface E {};
+        namespace E {};`);
+      idlArray.merge_partials();
+    })();
+
+    (() => {
+      const idlArray = new IdlArray();
+      idlArray.add_idls(`
+        partial interface F {};
+        partial interface mixin G {};
+      `);
+      idlArray.add_dependency_idls(`
+        interface F {};
+        interface mixin G {};
+        interface mixin H {};
+        F includes H;
+        I includes H;
+        J includes G;
+        interface K : J {};
+        interface L : F {};
+      `);
+      test(() => {
+        // Convert idlArray.includes into a Map from name of target interface to
+        // name of included mixin. (This assumes each interface includes at most
+        // one mixin, otherwise later includes would clobber earlier ones.)
+        const includes = new Map(idlArray.includes.map(i => [i.target, i.includes]));
+        // F is tested, so H is a dep.
+        assert_equals(includes.get('F'), 'H', 'F should be picked up');
+        // H is not tested, so I is not a dep.
+        assert_false(includes.has('I'), 'I should be ignored');
+        // G is a dep, so J is a dep.
+        assert_equals(includes.get('J'), 'G', 'J should be picked up');
+        // K isn't a dep because J isn't defined.
+        assert_false('K' in idlArray.members, 'K should be ignored');
+        // L isn't a dep because F is untested.
+        assert_false('L' in idlArray.members, 'L should be ignored');
+      }, 'partial mixin dep implications');
+    })();
+
+    // Name clash (partials)
+    (() => {
+      const idlArray = new IdlArray();
+      idlArray.add_idls(`
+        interface M { attribute any A; };
+        partial interface M { attribute any A; };`);
+      idlArray.merge_partials();
+    })();
+  </script>
+  <script type="text/json" id="expected">
+{
+  "summarized_status": {
+    "status_string": "OK",
+    "message": null
+  },
+  "summarized_tests": [
+    {
+      "name": "Partial interface A: original interface defined",
+      "status_string": "FAIL",
+      "properties": {},
+      "message": "assert_true: Original interface should be defined expected true got false"
+    },
+    {
+      "name": "Partial interface B: original interface defined",
+      "status_string": "PASS",
+      "properties": {},
+      "message": null
+    },
+    {
+      "name": "Partial interface B: valid exposure set",
+      "status_string": "PASS",
+      "properties": {},
+      "message": null
+    },
+    {
+      "name": "Partial interface C: original interface defined",
+      "status_string": "PASS",
+      "properties": {},
+      "message": null
+    },
+    {
+      "name": "Partial interface C: valid exposure set",
+      "status_string": "PASS",
+      "properties": {},
+      "message": null
+    },
+    {
+      "name": "Partial interface D: original interface defined",
+      "status_string": "PASS",
+      "properties": {},
+      "message": null
+    },
+    {
+      "name": "Partial interface D: valid exposure set",
+      "status_string": "FAIL",
+      "properties": {},
+      "message": "Partial D interface is exposed to 'DedicatedWorker', the original interface is not."
+    },
+    {
+      "name": "Partial interface E: original interface defined",
+      "status_string": "FAIL",
+      "properties": {},
+      "message": "assert_true: Original E definition should have type interface expected true got false"
+    },
+    {
+      "name": "partial mixin dep implications",
+      "status_string": "PASS",
+      "properties": {},
+      "message": null
+    },
+    {
+      "name": "Partial interface M: original interface defined",
+      "status_string": "PASS",
+      "properties": {},
+      "message": null
+    },
+    {
+      "name": "Partial interface M: member names are unique",
+      "status_string": "FAIL",
+      "properties": {},
+      "message": "assert_true: member A is unique expected true got false"
+    }
+  ],
+  "type": "complete"
+}
+</script>
+</body>
+
+</html>
diff --git a/test/wpt/tests/resources/test/tests/functional/idlharness/IdlInterface/test_primary_interface_of.html b/test/wpt/tests/resources/test/tests/functional/idlharness/IdlInterface/test_primary_interface_of.html
new file mode 100644
index 00000000000..309de60bb79
--- /dev/null
+++ b/test/wpt/tests/resources/test/tests/functional/idlharness/IdlInterface/test_primary_interface_of.html
@@ -0,0 +1,116 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <meta charset="utf-8">
+  <title>idlharness: Primary interface</title>
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  <script src="/resources/WebIDLParser.js"></script>
+  <script src="/resources/idlharness.js"></script>
+</head>
+<body>
+<p>Verify the series of sub-tests that are executed for "tested" interface
+objects but skipped for "untested" interface objects.</p>
+<script>
+"use strict";
+
+function FooParent() {
+    if (!new.target) {
+        throw new TypeError('FooParent() must be called with new');
+    }
+}
+Object.defineProperty(window, "Foo", {
+    enumerable: false,
+    writable: true,
+    configurable: true,
+    value: function Foo() {
+        if (!new.target) {
+            throw new TypeError('Foo() must be called with new');
+        }
+    }
+  });
+Object.defineProperty(window.Foo, "prototype", {
+    writable: false,
+    value: new FooParent()
+  });
+Object.defineProperty(window.Foo.prototype, "constructor", {
+    enumerable: false,
+    writable: true,
+    configurable: true,
+    value: window.Foo
+  });
+Object.setPrototypeOf(Foo, FooParent);
+Foo.prototype[Symbol.toStringTag] = "Foo";
+
+var idlArray = new IdlArray();
+idlArray.add_untested_idls("interface FooParent {};");
+idlArray.add_idls(
+    "interface Foo : FooParent { constructor(); };"
+  );
+idlArray.add_objects({
+  Foo: ["new Foo()"],
+  FooParent: ["new FooParent()"]
+});
+idlArray.test();
+</script>
+<script type="text/json" id="expected">
+{
+  "summarized_status": {
+    "status_string": "OK",
+    "message": null
+  },
+  "summarized_tests": [
+    {
+      "name": "Foo interface object length",
+      "status_string": "PASS",
+      "properties": {},
+      "message": null
+    },
+    {
+      "name": "Foo interface object name",
+      "status_string": "PASS",
+      "properties": {},
+      "message": null
+    },
+    {
+      "name": "Foo interface: existence and properties of interface object",
+      "status_string": "PASS",
+      "properties": {},
+      "message": null
+    },
+    {
+      "name": "Foo interface: existence and properties of interface prototype object",
+      "status_string": "PASS",
+      "properties": {},
+      "message": null
+    },
+    {
+      "name": "Foo interface: existence and properties of interface prototype object's \"constructor\" property",
+      "status_string": "PASS",
+      "properties": {},
+      "message": null
+    },
+    {
+      "name": "Foo interface: existence and properties of interface prototype object's @@unscopables property",
+      "status_string": "PASS",
+      "properties": {},
+      "message": null
+    },
+    {
+      "name": "Foo must be primary interface of new Foo()",
+      "status_string": "PASS",
+      "properties": {},
+      "message": null
+    },
+    {
+      "name": "Stringification of new Foo()",
+      "status_string": "PASS",
+      "properties": {},
+      "message": null
+    }
+  ],
+  "type": "complete"
+}
+</script>
+</body>
+</html>
diff --git a/test/wpt/tests/resources/test/tests/functional/idlharness/IdlInterface/test_to_json_operation.html b/test/wpt/tests/resources/test/tests/functional/idlharness/IdlInterface/test_to_json_operation.html
new file mode 100644
index 00000000000..bbc502a313f
--- /dev/null
+++ b/test/wpt/tests/resources/test/tests/functional/idlharness/IdlInterface/test_to_json_operation.html
@@ -0,0 +1,177 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <meta charset="utf-8">
+  <title>IdlInterface.prototype.test_to_json_operation()</title>
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  <script src="/resources/WebIDLParser.js"></script>
+  <script src="/resources/idlharness.js"></script>
+  <script src="../../../../idl-helper.js"></script>
+</head>
+<body>
+<script>
+    "use strict";
+    function wrap(member, obj) {
+        function F(obj) {
+            this._obj = obj;
+        }
+
+        F.prototype.toJSON = function() {
+            return this._obj;
+        }
+        Object.defineProperty(F, 'name', { value: member.name });
+        return new F(obj);
+    }
+
+    var i, obj;
+    i = interfaceFrom("interface A { [Default] object toJSON(); attribute long foo; };");
+    i.test_to_json_operation("object", wrap(i, { foo: 123 }), i.members[0]);
+
+    // should fail (wrong type)
+    i = interfaceFrom("interface B { [Default] object toJSON(); attribute long foo; };");
+    i.test_to_json_operation("object", wrap(i, { foo: "a value" }), i.members[0]);
+
+    // should handle extraneous attributes (e.g. from an extension specification)
+    i = interfaceFrom("interface C { [Default] object toJSON(); attribute long foo; };");
+    i.test_to_json_operation("object", wrap(i, { foo: 123, bar: 456 }), i.members[0]);
+
+    // should fail (missing property)
+    i = interfaceFrom("interface D { [Default] object toJSON(); attribute long foo; };");
+    i.test_to_json_operation("object", wrap(i, { }), i.members[0]);
+
+    // should fail (should be writable)
+    obj = Object.defineProperties({}, { foo: {
+        writable: false,
+        enumerable: true,
+        configurable: true,
+        value: 123
+    }});
+    i = interfaceFrom("interface F { [Default] object toJSON(); attribute long foo; };");
+    i.test_to_json_operation("object", wrap(i, obj), i.members[0]);
+
+    // should fail (should be enumerable)
+    obj = Object.defineProperties({}, { foo: {
+        writable: true,
+        enumerable: false,
+        configurable: true,
+        value: 123
+    }});
+    i = interfaceFrom("interface G { [Default] object toJSON(); attribute long foo; };");
+    i.test_to_json_operation("object", wrap(i, obj), i.members[0]);
+
+    // should fail (should be configurable)
+    obj = Object.defineProperties({}, { foo: {
+        writable: true,
+        enumerable: true,
+        configurable: false,
+        value: 123
+    }});
+    i = interfaceFrom("interface H { [Default] object toJSON(); attribute long foo; };");
+    i.test_to_json_operation("object", wrap(i, obj), i.members[0]);
+
+    var idl = new IdlArray();
+    idl.add_idls("interface I : J { [Default] object toJSON(); attribute long foo; };");
+    idl.add_idls("interface J { [Default] object toJSON(); attribute DOMString foo;};");
+    var i = idl.members.I;
+    i.test_to_json_operation("object", wrap(i, { foo: 123 }), i.members[0]);
+
+    i = interfaceFrom("interface K { [Default] object toJSON(); };");
+    i.test_to_json_operation("object", wrap(i, {}), i.members[0]);
+
+    i = interfaceFrom("interface L { DOMString toJSON(); };");
+    i.test_to_json_operation("object", wrap(i, "a string"), i.members[0]);
+
+    // should fail (wrong output type)
+    i = interfaceFrom("interface M { DOMString toJSON(); };");
+    i.test_to_json_operation("object", wrap(i, {}), i.members[0]);
+
+    // should fail (not an IDL type)
+    i = interfaceFrom("interface N { DOMException toJSON(); };");
+    i.test_to_json_operation("object", wrap(i, {}), i.members[0]);
+</script>
+<script type="text/json" id="expected">
+    {
+        "summarized_status": {
+            "message": null,
+            "status_string": "OK"
+        },
+        "summarized_tests": [
+            {
+                "message": null,
+                "name": "A interface: default toJSON operation on object",
+                "properties": {},
+                "status_string": "PASS"
+            },
+            {
+                "message": "assert_equals: expected \"number\" but got \"string\"",
+                "name": "B interface: default toJSON operation on object",
+                "properties": {},
+                "status_string": "FAIL"
+            },
+            {
+                "message": null,
+                "name": "C interface: default toJSON operation on object",
+                "properties": {},
+                "status_string": "PASS"
+            },
+            {
+                "message": "assert_true: property \"foo\" should be present in the output of D.prototype.toJSON() expected true got false",
+                "name": "D interface: default toJSON operation on object",
+                "properties": {},
+                "status_string": "FAIL"
+            },
+            {
+                "message": "assert_true: property foo should be writable expected true got false",
+                "name": "F interface: default toJSON operation on object",
+                "properties": {},
+                "status_string": "FAIL"
+            },
+            {
+                "message": "assert_true: property foo should be enumerable expected true got false",
+                "name": "G interface: default toJSON operation on object",
+                "properties": {},
+                "status_string": "FAIL"
+            },
+            {
+                "message": "assert_true: property foo should be configurable expected true got false",
+                "name": "H interface: default toJSON operation on object",
+                "properties": {},
+                "status_string": "FAIL"
+            },
+            {
+                "message": null,
+                "name": "I interface: default toJSON operation on object",
+                "properties": {},
+                "status_string": "PASS"
+            },
+            {
+                "message": null,
+                "name": "K interface: default toJSON operation on object",
+                "properties": {},
+                "status_string": "PASS"
+            },
+            {
+                "message": null,
+                "name": "L interface: toJSON operation on object",
+                "properties": {},
+                "status_string": "PASS"
+            },
+            {
+                "message": "assert_equals: expected \"string\" but got \"object\"",
+                "name": "M interface: toJSON operation on object",
+                "properties": {},
+                "status_string": "FAIL"
+            },
+            {
+                "message": "assert_true: {\"type\":\"return-type\",\"extAttrs\":[],\"generic\":\"\",\"nullable\":false,\"union\":false,\"idlType\":\"DOMException\"} is not an appropriate return value for the toJSON operation of N expected true got false",
+                "name": "N interface: toJSON operation on object",
+                "properties": {},
+                "status_string": "FAIL"
+            }
+        ],
+        "type": "complete"
+    }
+</script>
+</body>
+</html>
diff --git a/test/wpt/tests/resources/test/tests/functional/idlharness/IdlNamespace/test_attribute.html b/test/wpt/tests/resources/test/tests/functional/idlharness/IdlNamespace/test_attribute.html
new file mode 100644
index 00000000000..2c94061fc1e
--- /dev/null
+++ b/test/wpt/tests/resources/test/tests/functional/idlharness/IdlNamespace/test_attribute.html
@@ -0,0 +1,100 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <meta charset="utf-8">
+  <title>idlharness: namespace attribute</title>
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  <script src="/resources/WebIDLParser.js"></script>
+  <script src="/resources/idlharness.js"></script>
+</head>
+<body>
+<p>Verify the series of sub-tests that are executed for namespace attributes.</p>
+<script>
+"use strict";
+
+Object.defineProperty(self, "foo", {
+  value: {
+    truth: true,
+  },
+  writable: true,
+  enumerable: false,
+  configurable: true,
+});
+
+var idlArray = new IdlArray();
+idlArray.add_idls(`
+[Exposed=Window]
+namespace foo {
+  readonly attribute bool truth;
+  readonly attribute bool lies;
+};`);
+idlArray.test();
+</script>
+<script type="text/json" id="expected">
+{
+  "summarized_status": {
+    "status_string": "OK",
+    "message": null
+  },
+  "summarized_tests": [
+    {
+      "name": "foo namespace: extended attributes",
+      "status_string": "PASS",
+      "properties": {},
+      "message": null
+    },
+    {
+      "name": "foo namespace: property descriptor",
+      "status_string": "PASS",
+      "properties": {},
+      "message": null
+    },
+    {
+      "name": "foo namespace: [[Extensible]] is true",
+      "status_string": "PASS",
+      "properties": {},
+      "message": null
+    },
+    {
+      "name": "foo namespace: [[Prototype]] is Object.prototype",
+      "status_string": "PASS",
+      "properties": {},
+      "message": null
+    },
+    {
+      "name": "foo namespace: typeof is \"object\"",
+      "status_string": "PASS",
+      "properties": {},
+      "message": null
+    },
+    {
+      "name": "foo namespace: has no length property",
+      "status_string": "PASS",
+      "properties": {},
+      "message": null
+    },
+    {
+      "name": "foo namespace: has no name property",
+      "status_string": "PASS",
+      "properties": {},
+      "message": null
+    },
+    {
+      "name": "foo namespace: attribute truth",
+      "status_string": "PASS",
+      "properties": {},
+      "message": null
+    },
+    {
+      "name": "foo namespace: attribute lies",
+      "status_string": "FAIL",
+      "properties": {},
+      "message": "assert_own_property: foo does not have property \"lies\" expected property \"lies\" missing"
+    }
+  ],
+  "type": "complete"
+}
+</script>
+</body>
+</html>
diff --git a/test/wpt/tests/resources/test/tests/functional/idlharness/IdlNamespace/test_operation.html b/test/wpt/tests/resources/test/tests/functional/idlharness/IdlNamespace/test_operation.html
new file mode 100644
index 00000000000..da70c8fa31c
--- /dev/null
+++ b/test/wpt/tests/resources/test/tests/functional/idlharness/IdlNamespace/test_operation.html
@@ -0,0 +1,242 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <meta charset="utf-8">
+  <title>idlharness: namespace operation</title>
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  <script src="/resources/WebIDLParser.js"></script>
+  <script src="/resources/idlharness.js"></script>
+</head>
+<body>
+<p>Verify the series of sub-tests that are executed for namespace operations.</p>
+<script>
+"use strict";
+
+Object.defineProperty(self, "foo", {
+  value: Object.defineProperty({}, "Truth", {
+    value: function() {},
+    writable: true,
+    enumerable: true,
+    configurable: true,
+  }),
+  writable: true,
+  enumerable: false,
+  configurable: true,
+});
+
+Object.defineProperty(self, "bar", {
+  value: Object.defineProperty({}, "Truth", {
+    value: function() {},
+    writable: false,
+    enumerable: true,
+    configurable: false,
+  }),
+  writable: true,
+  enumerable: false,
+  configurable: true,
+});
+
+Object.defineProperty(self, "baz", {
+  value: {
+    LongStory: function(hero, ...details) {
+      return `${hero} went and ${details.join(', then')}`
+    },
+    ShortStory: function(...details) {
+      return `${details.join('. ')}`;
+    },
+  },
+  writable: true,
+  enumerable: false,
+  configurable: true,
+});
+
+var idlArray = new IdlArray();
+idlArray.add_idls(`
+[Exposed=Window]
+namespace foo {
+  undefined Truth();
+  undefined Lies();
+};
+[Exposed=Window]
+namespace bar {
+  [LegacyUnforgeable]
+  undefined Truth();
+};
+[Exposed=Window]
+namespace baz {
+  DOMString LongStory(any hero, DOMString... details);
+  DOMString ShortStory(DOMString... details);
+};`);
+idlArray.test();
+</script>
+<script type="text/json" id="expected">
+{
+  "summarized_status": {
+    "status_string": "OK",
+    "message": null
+  },
+  "summarized_tests": [
+    {
+      "name": "foo namespace: extended attributes",
+      "status_string": "PASS",
+      "properties": {},
+      "message": null
+    },
+    {
+      "name": "foo namespace: property descriptor",
+      "status_string": "PASS",
+      "properties": {},
+      "message": null
+    },
+    {
+      "name": "foo namespace: [[Extensible]] is true",
+      "status_string": "PASS",
+      "properties": {},
+      "message": null
+    },
+    {
+      "name": "foo namespace: [[Prototype]] is Object.prototype",
+      "status_string": "PASS",
+      "properties": {},
+      "message": null
+    },
+    {
+      "name": "foo namespace: typeof is \"object\"",
+      "status_string": "PASS",
+      "properties": {},
+      "message": null
+    },
+    {
+      "name": "foo namespace: has no length property",
+      "status_string": "PASS",
+      "properties": {},
+      "message": null
+    },
+    {
+      "name": "foo namespace: has no name property",
+      "status_string": "PASS",
+      "properties": {},
+      "message": null
+    },
+    {
+      "name": "foo namespace: operation Truth()",
+      "status_string": "PASS",
+      "properties": {},
+      "message": null
+    },
+    {
+      "name": "foo namespace: operation Lies()",
+      "status_string": "FAIL",
+      "properties": {},
+      "message": "assert_own_property: namespace object missing operation \"Lies\" expected property \"Lies\" missing"
+    },
+    {
+      "name": "bar namespace: extended attributes",
+      "status_string": "PASS",
+      "properties": {},
+      "message": null
+    },
+    {
+      "name": "bar namespace: property descriptor",
+      "status_string": "PASS",
+      "properties": {},
+      "message": null
+    },
+    {
+      "name": "bar namespace: [[Extensible]] is true",
+      "status_string": "PASS",
+      "properties": {},
+      "message": null
+    },
+    {
+      "name": "bar namespace: [[Prototype]] is Object.prototype",
+      "status_string": "PASS",
+      "properties": {},
+      "message": null
+    },
+    {
+      "name": "bar namespace: typeof is \"object\"",
+      "status_string": "PASS",
+      "properties": {},
+      "message": null
+    },
+    {
+      "name": "bar namespace: has no length property",
+      "status_string": "PASS",
+      "properties": {},
+      "message": null
+    },
+    {
+      "name": "bar namespace: has no name property",
+      "status_string": "PASS",
+      "properties": {},
+      "message": null
+    },
+    {
+      "name": "bar namespace: operation Truth()",
+      "status_string": "PASS",
+      "properties": {},
+      "message": null
+    },
+
+    {
+      "name": "baz namespace: extended attributes",
+      "status_string": "PASS",
+      "properties": {},
+      "message": null
+    },
+    {
+      "name": "baz namespace: property descriptor",
+      "status_string": "PASS",
+      "properties": {},
+      "message": null
+    },
+    {
+      "name": "baz namespace: [[Extensible]] is true",
+      "status_string": "PASS",
+      "properties": {},
+      "message": null
+    },
+    {
+      "name": "baz namespace: [[Prototype]] is Object.prototype",
+      "status_string": "PASS",
+      "properties": {},
+      "message": null
+    },
+    {
+      "name": "baz namespace: typeof is \"object\"",
+      "status_string": "PASS",
+      "properties": {},
+      "message": null
+    },
+    {
+      "name": "baz namespace: has no length property",
+      "status_string": "PASS",
+      "properties": {},
+      "message": null
+    },
+    {
+      "name": "baz namespace: has no name property",
+      "status_string": "PASS",
+      "properties": {},
+      "message": null
+    },
+    {
+      "name": "baz namespace: operation LongStory(any, DOMString...)",
+      "status_string": "PASS",
+      "properties": {},
+      "message": null
+    },
+    {
+      "name": "baz namespace: operation ShortStory(DOMString...)",
+      "status_string": "PASS",
+      "properties": {},
+      "message": null
+    }
+  ],
+  "type": "complete"
+}
+</script>
+</body>
+</html>
diff --git a/test/wpt/tests/resources/test/tests/functional/idlharness/IdlNamespace/test_partial_namespace.html b/test/wpt/tests/resources/test/tests/functional/idlharness/IdlNamespace/test_partial_namespace.html
new file mode 100644
index 00000000000..eabdcd10a96
--- /dev/null
+++ b/test/wpt/tests/resources/test/tests/functional/idlharness/IdlNamespace/test_partial_namespace.html
@@ -0,0 +1,125 @@
+<!DOCTYPE HTML>
+<html>
+
+<head>
+  <meta charset="utf-8">
+  <title>idlharness: Partial namespace</title>
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  <script src="/resources/WebIDLParser.js"></script>
+  <script src="/resources/idlharness.js"></script>
+</head>
+
+<body>
+  <p>Verify the series of sub-tests that are executed for "partial" namespace objects.</p>
+  <script>
+    "use strict";
+
+    // No original existence
+    (() => {
+      const idlArray = new IdlArray();
+      idlArray.add_idls('partial namespace A {};');
+      idlArray.test();
+    })();
+
+    // Valid exposure (Note: Worker -> {Shared,Dedicated,Service}Worker)
+    (() => {
+      const idlArray = new IdlArray();
+      idlArray.add_untested_idls(`
+        [Exposed=(Worker)]
+        namespace B {};
+
+        [Exposed=(DedicatedWorker, ServiceWorker, SharedWorker)]
+        namespace C {};`);
+      idlArray.add_idls(`
+        [Exposed=(DedicatedWorker, ServiceWorker, SharedWorker)]
+        partial namespace B {};
+
+        [Exposed=(Worker)]
+        partial namespace C {};`);
+      idlArray.merge_partials();
+    })();
+
+    // Invalid exposure
+    (() => {
+      const idlArray = new IdlArray();
+      idlArray.add_untested_idls(`
+        [Exposed=(Window, ServiceWorker)]
+        namespace D {};`);
+      idlArray.add_idls(`
+        [Exposed=(DedicatedWorker)]
+        partial namespace D {};`);
+      idlArray.merge_partials();
+    })();
+
+    // Original is an interface, not a namespace.
+    (() => {
+      const idlArray = new IdlArray();
+      idlArray.add_idls(`
+        partial namespace E {};
+        interface E {};`);
+      idlArray.merge_partials();
+    })();
+  </script>
+  <script type="text/json" id="expected">
+{
+  "summarized_status": {
+    "status_string": "OK",
+    "message": null
+  },
+  "summarized_tests": [
+    {
+      "name": "Partial namespace A: original namespace defined",
+      "status_string": "FAIL",
+      "properties": {},
+      "message": "assert_true: Original namespace should be defined expected true got false"
+    },
+    {
+      "name": "Partial namespace B: original namespace defined",
+      "status_string": "PASS",
+      "properties": {},
+      "message": null
+    },
+    {
+      "name": "Partial namespace B: valid exposure set",
+      "status_string": "PASS",
+      "properties": {},
+      "message": null
+    },
+    {
+      "name": "Partial namespace C: original namespace defined",
+      "status_string": "PASS",
+      "properties": {},
+      "message": null
+    },
+    {
+      "name": "Partial namespace C: valid exposure set",
+      "status_string": "PASS",
+      "properties": {},
+      "message": null
+    },
+    {
+      "name": "Partial namespace D: original namespace defined",
+      "status_string": "PASS",
+      "properties": {},
+      "message": null
+    },
+    {
+      "name": "Partial namespace D: valid exposure set",
+      "status_string": "FAIL",
+      "properties": {},
+      "message": "Partial D namespace is exposed to 'DedicatedWorker', the original namespace is not."
+    },
+    {
+      "name": "Partial namespace E: original namespace defined",
+      "status_string": "FAIL",
+      "properties": {},
+      "message": "assert_true: Original E definition should have type namespace expected true got false"
+    }
+  ],
+  "type": "complete"
+}
+</script>
+</body>
+
+</html>
diff --git a/test/wpt/tests/resources/test/tests/functional/iframe-callback.html b/test/wpt/tests/resources/test/tests/functional/iframe-callback.html
new file mode 100644
index 00000000000..f49d0aa6b80
--- /dev/null
+++ b/test/wpt/tests/resources/test/tests/functional/iframe-callback.html
@@ -0,0 +1,116 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+<title>Example with iframe that notifies containing document via callbacks</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+</head>
+<body onload="start_test_in_iframe()">
+<h1>Callbacks From Tests Running In An IFRAME</h1>
+<p>A test is run inside an <tt>iframe</tt> with a same origin document. The
+containing document should receive callbacks as the tests progress inside the
+<tt>iframe</tt>. A single passing test is expected in the summary below.
+<div id="log"></div>
+
+<script>
+var callbacks = [];
+var START = 1
+var TEST_STATE = 2
+var RESULT = 3
+var COMPLETION = 4
+var test_complete = false;
+
+setup({explicit_done: true});
+
+// The following callbacks are called for tests in this document as well as the
+// tests in the IFRAME. Currently, callbacks invoked from this document and any
+// child document are indistinguishable from each other.
+
+function start_callback(properties) {
+    callbacks.push(START);
+}
+
+function test_state_callback(test) {
+    callbacks.push(TEST_STATE);
+}
+
+function result_callback(test) {
+    callbacks.push(RESULT);
+}
+
+function completion_callback(tests, status) {
+    if (test_complete) {
+        return;
+    }
+    test_complete = true;
+    callbacks.push(COMPLETION);
+    verify_received_callbacks();
+    done();
+}
+
+function verify_received_callbacks() {
+    var copy_of_callbacks = callbacks.slice(0);
+
+    // Note that you can't run test assertions directly in a callback even if
+    // this is a file test. When the callback is invoked from a same-origin child
+    // page, the callstack reaches into the calling child document. Any
+    // exception thrown in a callback will be handled by the child rather than
+    // this document.
+    test(
+        function() {
+            // callbacks list should look like:
+            //     START 1*(TEST_STATE) RESULT COMPLETION
+            assert_equals(copy_of_callbacks.shift(), START,
+                          "The first received callback should be 'start_callback'.");
+            assert_equals(copy_of_callbacks.shift(), TEST_STATE,
+                          "'test_state_callback' should be received before any " +
+                          "result or completion callbacks.");
+            while(copy_of_callbacks.length > 0) {
+                var callback = copy_of_callbacks.shift();
+                if (callback != TEST_STATE) {
+                    copy_of_callbacks.unshift(callback);
+                    break;
+                }
+            }
+            assert_equals(copy_of_callbacks.shift(), RESULT,
+                          "'test_state_callback' should be followed by 'result_callback'.");
+            assert_equals(copy_of_callbacks.shift(), COMPLETION,
+                          "Final 'result_callback' should be followed by 'completion_callback'.");
+            assert_equals(copy_of_callbacks.length, 0,
+                          "'completion_callback' should be the last callback.");
+        });
+}
+
+function start_test_in_iframe() {
+    // This document is going to clear any received callbacks and maintain
+    // radio silence until the test in the iframe runs to completion. The
+    // completion_callback() will then complete the testing on this document.
+    callbacks.length = 0;
+    var iframe = document.createElement("iframe");
+    // single-page-test-pass.html has a single test.
+    iframe.src = "single-page-test-pass.html";
+    iframe.style.setProperty("display", "none");
+    document.getElementById("target").appendChild(iframe);
+}
+</script>
+
+<div id="target">
+</div>
+<script type="text/json" id="expected">
+{
+  "summarized_status": {
+    "status_string": "OK",
+    "message": null
+  },
+  "summarized_tests": [
+    {
+      "status_string": "PASS",
+      "name": "Example with iframe that notifies containing document via callbacks",
+      "properties": {},
+      "message": null
+    }
+  ],
+  "type": "complete"
+}
+</script>
+</body>
diff --git a/test/wpt/tests/resources/test/tests/functional/iframe-consolidate-errors.html b/test/wpt/tests/resources/test/tests/functional/iframe-consolidate-errors.html
new file mode 100644
index 00000000000..ef9b8702eca
--- /dev/null
+++ b/test/wpt/tests/resources/test/tests/functional/iframe-consolidate-errors.html
@@ -0,0 +1,50 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+<title>Example with iframe that consolidates errors via fetch_tests_from_window</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script>
+var parent_test = async_test("Test executing in parent context");
+</script>
+</head>
+<body onload="parent_test.done()">
+<h1>Fetching Tests From a Child Context</h1>
+<p>This test demonstrates the use of <tt>fetch_tests_from_window</tt> to pull
+tests from an <tt>iframe</tt> into the primary document.</p>
+<p>The test suite is expected to fail due to an unhandled exception in the
+child context.</p>
+<div id="log"></div>
+
+<iframe id="childContext" src="uncaught-exception-handle.html" style="display:none"></iframe>
+<!-- apisample4.html is a failing suite due to an unhandled Error. -->
+
+<script>
+  var childContext = document.getElementById("childContext");
+  fetch_tests_from_window(childContext.contentWindow);
+</script>
+<script type="text/json" id="expected">
+{
+  "summarized_status": {
+    "status_string": "ERROR",
+    "message": "Error in remote: Error: Example Error"
+  },
+  "summarized_tests": [
+    {
+      "status_string": "PASS",
+      "name": "Test executing in parent context",
+      "properties": {},
+      "message": null
+    },
+    {
+      "status_string": "NOTRUN",
+      "name": "This should show a harness status of 'Error' and a test status of 'Not Run'",
+      "properties": {},
+      "message": null
+    }
+  ],
+  "type": "complete"
+}
+</script>
+</body>
+</html>
diff --git a/test/wpt/tests/resources/test/tests/functional/iframe-consolidate-tests.html b/test/wpt/tests/resources/test/tests/functional/iframe-consolidate-tests.html
new file mode 100644
index 00000000000..246dddee115
--- /dev/null
+++ b/test/wpt/tests/resources/test/tests/functional/iframe-consolidate-tests.html
@@ -0,0 +1,85 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+<title>Example with iframe that consolidates tests via fetch_tests_from_window</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script>
+var parent_test = async_test("Test executing in parent context");
+</script>
+</head>
+<body onload="parent_test.done()">
+<h1>Fetching Tests From a Child Context</h1>
+<p>This test demonstrates the use of <tt>fetch_tests_from_window</tt> to pull
+tests from an <tt>iframe</tt> into the primary document.</p>
+<p>The test suite will not complete until tests in the child context have finished
+executing</p>
+<div id="log"></div>
+
+<iframe id="childContext" src="promise-async.html" style="display:none"></iframe>
+
+<script>
+  var childContext = document.getElementById("childContext");
+  fetch_tests_from_window(childContext.contentWindow);
+</script>
+<script type="text/json" id="expected">
+{
+  "summarized_status": {
+    "status_string": "OK",
+    "message": null
+  },
+  "summarized_tests": [
+    {
+      "status_string": "PASS",
+      "name": "Promise rejection",
+      "properties": {},
+      "message": null
+    },
+    {
+      "status_string": "PASS",
+      "name": "Promise resolution",
+      "properties": {},
+      "message": null
+    },
+    {
+      "status_string": "FAIL",
+      "name": "Promises and test assertion failures (should fail)",
+      "properties": {},
+      "message": "assert_true: This failure is expected expected true got false"
+    },
+    {
+      "status_string": "PASS",
+      "name": "Promises are supported in your browser",
+      "properties": {},
+      "message": null
+    },
+    {
+      "status_string": "PASS",
+      "name": "Promises resolution chaining",
+      "properties": {},
+      "message": null
+    },
+    {
+      "status_string": "PASS",
+      "name": "Test executing in parent context",
+      "properties": {},
+      "message": null
+    },
+    {
+      "status_string": "PASS",
+      "name": "Use of step_func with Promises",
+      "properties": {},
+      "message": null
+    },
+    {
+      "status_string": "FAIL",
+      "name": "Use of unreached_func with Promises (should fail)",
+      "properties": {},
+      "message": "assert_unreached: This failure is expected Reached unreachable code"
+    }
+  ],
+  "type": "complete"
+}
+</script>
+</body>
+</html>
diff --git a/test/wpt/tests/resources/test/tests/functional/iframe-msg.html b/test/wpt/tests/resources/test/tests/functional/iframe-msg.html
new file mode 100644
index 00000000000..283a5d98cc3
--- /dev/null
+++ b/test/wpt/tests/resources/test/tests/functional/iframe-msg.html
@@ -0,0 +1,84 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+<title>Example with iframe that notifies containing document via cross document messaging</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+</head>
+<body>
+<h1>Notifications From Tests Running In An IFRAME</h1>
+<p>A test is run inside an <tt>iframe</tt> with a same origin document. The
+containing document should receive messages via <tt>postMessage</tt>/
+<tt>onmessage</tt> as the tests progress inside the <tt>iframe</tt>. A single
+passing test is expected in the summary below.
+</p>
+<div id="log"></div>
+
+<script>
+var t = async_test("Containing document receives messages");
+var start_received = false;
+var result_received = false;
+var completion_received = false;
+
+// These are the messages that are expected to be seen while running the tests
+// in the IFRAME.
+var expected_messages = [
+    t.step_func(
+        function(message) {
+            assert_equals(message.data.type, "start");
+            assert_own_property(message.data, "properties");
+        }),
+
+    t.step_func(
+        function(message) {
+            assert_equals(message.data.type, "test_state");
+            assert_equals(message.data.test.status, message.data.test.NOTRUN);
+        }),
+
+    t.step_func(
+        function(message) {
+            assert_equals(message.data.type, "result");
+            assert_equals(message.data.test.status, message.data.test.PASS);
+        }),
+
+    t.step_func(
+        function(message) {
+            assert_equals(message.data.type, "complete");
+            assert_equals(message.data.tests.length, 1);
+            assert_equals(message.data.tests[0].status,
+                          message.data.tests[0].PASS);
+            assert_equals(message.data.status.status, message.data.status.OK);
+            t.done();
+        }),
+
+    t.unreached_func("Too many messages received")
+];
+
+on_event(window,
+         "message",
+         function(message) {
+             var handler = expected_messages.shift();
+             handler(message);
+         });
+</script>
+<iframe src="single-page-test-pass.html" style="display:none">
+  <!-- single-page-test-pass.html implements a file_is_test test. -->
+</iframe>
+<script type="text/json" id="expected">
+{
+  "summarized_status": {
+    "status_string": "OK",
+    "message": null
+  },
+  "summarized_tests": [
+    {
+      "status_string": "PASS",
+      "name": "Containing document receives messages",
+      "properties": {},
+      "message": null
+    }
+  ],
+  "type": "complete"
+}
+</script>
+</body>
diff --git a/test/wpt/tests/resources/test/tests/functional/log-insertion.html b/test/wpt/tests/resources/test/tests/functional/log-insertion.html
new file mode 100644
index 00000000000..9a63c3dbded
--- /dev/null
+++ b/test/wpt/tests/resources/test/tests/functional/log-insertion.html
@@ -0,0 +1,46 @@
+<!DOCTYPE HTML>
+<title>Log insertion</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script>
+test(function(t) {
+  assert_equals(document.body, null);
+}, "Log insertion before load");
+test(function(t) {
+  assert_equals(document.body, null);
+}, "Log insertion before load (again)");
+async_test(function(t) {
+  window.onload = t.step_func_done(function() {
+    var body = document.body;
+    assert_not_equals(body, null);
+
+    var log = document.getElementById("log");
+    assert_equals(log.parentNode, body);
+  });
+}, "Log insertion after load");
+</script>
+<script type="text/json" id="expected">
+{
+  "summarized_status": {
+    "status_string": "OK",
+    "message": null
+  },
+  "summarized_tests": [{
+    "status_string": "PASS",
+    "name": "Log insertion before load",
+    "message": null,
+    "properties": {}
+  }, {
+    "status_string": "PASS",
+    "name": "Log insertion before load (again)",
+    "message": null,
+    "properties": {}
+  }, {
+    "status_string": "PASS",
+    "name": "Log insertion after load",
+    "message": null,
+    "properties": {}
+  }],
+  "type": "complete"
+}
+</script>
diff --git a/test/wpt/tests/resources/test/tests/functional/no-title.html b/test/wpt/tests/resources/test/tests/functional/no-title.html
new file mode 100644
index 00000000000..a337e4e5f57
--- /dev/null
+++ b/test/wpt/tests/resources/test/tests/functional/no-title.html
@@ -0,0 +1,146 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+<title>Tests with no title</title>
+</head>
+<script src="/resources/testharness.js"></script>
+
+<body>
+<h1>Tests with no title</h1>
+<div id="log"></div>
+<script>
+  test(function(){assert_true(true, '1')});
+  test(()=>assert_true(true, '2'));
+  test(() => assert_true(true, '3'));
+  test(() => assert_true(true, '3'));  // test duplicate behaviour
+  test(() => assert_true(true, '3'));  // test duplicate behaviour
+  test(() => {
+      assert_true(true, '4');
+  });
+  test(() => { assert_true(true, '5') });
+  test(() => { assert_true(true, '6') }   );
+  test(() => { assert_true(true, '7'); });
+  test(() => {});
+  test(() => { });
+  test(() => {;;;;});
+  test(() => { ; ; ; ; });
+  test(()=>{});
+  test(()=>{ });
+  test(()=>{;;;;});
+  test(()=>{ ; ; ; ; });
+</script>
+<script type="text/json" id="expected">
+{
+  "summarized_status": {
+    "status_string": "OK",
+    "message": null
+  },
+  "summarized_tests": [
+    {
+      "status_string": "PASS",
+      "name": "Tests with no title",
+      "properties": {},
+      "message": null
+    },
+    {
+      "status_string": "PASS",
+      "name": "assert_true(true, '2')",
+      "properties": {},
+      "message": null
+    },
+    {
+      "status_string": "PASS",
+      "name": "assert_true(true, '3')",
+      "properties": {},
+      "message": null
+    },
+    {
+      "status_string": "PASS",
+      "name": "assert_true(true, '3') 1",
+      "properties": {},
+      "message": null
+    },
+    {
+      "status_string": "PASS",
+      "name": "assert_true(true, '3') 2",
+      "properties": {},
+      "message": null
+    },
+    {
+      "status_string": "PASS",
+      "name": "Tests with no title 1",
+      "properties": {},
+      "message": null
+    },
+    {
+      "status_string": "PASS",
+      "name": "assert_true(true, '5')",
+      "properties": {},
+      "message": null
+    },
+    {
+      "status_string": "PASS",
+      "name": "assert_true(true, '6')",
+      "properties": {},
+      "message": null
+    },
+    {
+      "status_string": "PASS",
+      "name": "assert_true(true, '7')",
+      "properties": {},
+      "message": null
+    },
+    {
+      "status_string": "PASS",
+      "name": "Tests with no title 2",
+      "properties": {},
+      "message": null
+    },
+    {
+      "status_string": "PASS",
+      "name": "Tests with no title 3",
+      "properties": {},
+      "message": null
+    },
+    {
+      "status_string": "PASS",
+      "name": "Tests with no title 4",
+      "properties": {},
+      "message": null
+    },
+    {
+      "status_string": "PASS",
+      "name": "Tests with no title 5",
+      "properties": {},
+      "message": null
+    },
+    {
+      "status_string": "PASS",
+      "name": "Tests with no title 6",
+      "properties": {},
+      "message": null
+    },
+    {
+      "status_string": "PASS",
+      "name": "Tests with no title 7",
+      "properties": {},
+      "message": null
+    },
+    {
+      "status_string": "PASS",
+      "name": "Tests with no title 8",
+      "properties": {},
+      "message": null
+    },
+    {
+      "status_string": "PASS",
+      "name": "Tests with no title 9",
+      "properties": {},
+      "message": null
+    }
+  ],
+  "type": "complete"
+}
+</script>
+</body>
+</html>
diff --git a/test/wpt/tests/resources/test/tests/functional/order.html b/test/wpt/tests/resources/test/tests/functional/order.html
new file mode 100644
index 00000000000..686383861a0
--- /dev/null
+++ b/test/wpt/tests/resources/test/tests/functional/order.html
@@ -0,0 +1,36 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+<title>Ordering</title>
+<meta name="timeout" content="6000">
+</head>
+<body>
+<div id="log"></div>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script>
+test(function() {}, 'second');
+test(function() {}, 'first');
+</script>
+<script type="text/json" id="expected">
+{
+  "summarized_status": {
+    "status_string": "OK",
+    "message": null
+  },
+  "summarized_tests": [{
+    "status_string": "PASS",
+    "name": "first",
+    "message": null,
+    "properties": {}
+  }, {
+    "status_string": "PASS",
+    "name": "second",
+    "message": null,
+    "properties": {}
+  }],
+  "type": "complete"
+}
+</script>
+</body>
+</html>
diff --git a/test/wpt/tests/resources/test/tests/functional/promise-async.html b/test/wpt/tests/resources/test/tests/functional/promise-async.html
new file mode 100644
index 00000000000..fa82665cf00
--- /dev/null
+++ b/test/wpt/tests/resources/test/tests/functional/promise-async.html
@@ -0,0 +1,172 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+<title>Async Tests and Promises</title>
+</head>
+<body>
+<h1>Async Tests and Promises</h1>
+<p>This test assumes ECMAScript 6 Promise support. Some failures are expected.</p>
+<div id="log"></div>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script>
+
+test(function() {
+  var p = new Promise(function(resolve, reject) {});
+  assert_true('then' in p);
+  assert_equals(typeof Promise.resolve, 'function');
+  assert_equals(typeof Promise.reject, 'function');
+}, "Promises are supported in your browser");
+
+(function() {
+  var t = async_test("Promise resolution");
+  t.step(function() {
+    Promise.resolve('x').then(
+      t.step_func(function(value) {
+        assert_equals(value, 'x');
+        t.done();
+      }),
+      t.unreached_func('Promise should not reject')
+    );
+  });
+}());
+
+(function() {
+  var t = async_test("Promise rejection");
+  t.step(function() {
+    Promise.reject(Error('fail')).then(
+      t.unreached_func('Promise should reject'),
+      t.step_func(function(reason) {
+        assert_true(reason instanceof Error);
+        assert_equals(reason.message, 'fail');
+        t.done();
+      })
+    );
+  });
+}());
+
+(function() {
+  var t = async_test("Promises resolution chaining");
+  t.step(function() {
+    var resolutions = [];
+    Promise.resolve('a').then(
+      t.step_func(function(value) {
+        resolutions.push(value);
+        return 'b';
+      })
+    ).then(
+      t.step_func(function(value) {
+        resolutions.push(value);
+        return 'c';
+      })
+    ).then(
+      t.step_func(function(value) {
+        resolutions.push(value);
+
+        assert_array_equals(resolutions, ['a', 'b', 'c']);
+        t.done();
+      })
+    ).catch(
+      t.unreached_func('promise should not have rejected')
+    );
+  });
+}());
+
+(function() {
+  var t = async_test("Use of step_func with Promises");
+  t.step(function() {
+    var resolutions = [];
+    Promise.resolve('x').then(
+      t.step_func_done(),
+      t.unreached_func('Promise should not have rejected')
+    );
+  });
+}());
+
+(function() {
+  var t = async_test("Promises and test assertion failures (should fail)");
+  t.step(function() {
+    var resolutions = [];
+    Promise.resolve('x').then(
+      t.step_func(function(value) {
+        assert_true(false, 'This failure is expected');
+      })
+    ).then(
+      t.unreached_func('Promise should not have resolved')
+    ).catch(
+      t.unreached_func('Promise should not have rejected')
+    );
+  });
+}());
+
+(function() {
+  var t = async_test("Use of unreached_func with Promises (should fail)");
+  t.step(function() {
+    var resolutions = [];
+    var r;
+    var p = new Promise(function(resolve, reject) {
+      // Reject instead of resolve, to demonstrate failure.
+      reject(123);
+    });
+    p.then(
+      function(value) {
+        assert_equals(value, 123, 'This should not actually happen');
+      },
+      t.unreached_func('This failure is expected')
+    );
+  });
+}());
+</script>
+<script type="text/json" id="expected">
+{
+  "summarized_status": {
+    "status_string": "OK",
+    "message": null
+  },
+  "summarized_tests": [
+    {
+      "status_string": "PASS",
+      "name": "Promise rejection",
+      "properties": {},
+      "message": null
+    },
+    {
+      "status_string": "PASS",
+      "name": "Promise resolution",
+      "properties": {},
+      "message": null
+    },
+    {
+      "status_string": "FAIL",
+      "name": "Promises and test assertion failures (should fail)",
+      "properties": {},
+      "message": "assert_true: This failure is expected expected true got false"
+    },
+    {
+      "status_string": "PASS",
+      "name": "Promises are supported in your browser",
+      "properties": {},
+      "message": null
+    },
+    {
+      "status_string": "PASS",
+      "name": "Promises resolution chaining",
+      "properties": {},
+      "message": null
+    },
+    {
+      "status_string": "PASS",
+      "name": "Use of step_func with Promises",
+      "properties": {},
+      "message": null
+    },
+    {
+      "status_string": "FAIL",
+      "name": "Use of unreached_func with Promises (should fail)",
+      "properties": {},
+      "message": "assert_unreached: This failure is expected Reached unreachable code"
+    }
+  ],
+  "type": "complete"
+}
+</script>
diff --git a/test/wpt/tests/resources/test/tests/functional/promise-with-sync.html b/test/wpt/tests/resources/test/tests/functional/promise-with-sync.html
new file mode 100644
index 00000000000..e8e680a9c76
--- /dev/null
+++ b/test/wpt/tests/resources/test/tests/functional/promise-with-sync.html
@@ -0,0 +1,79 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+<title>Promise Tests and Synchronous Tests</title>
+</head>
+<body>
+<h1>Promise Tests</h1>
+<p>This test demonstrates the use of <tt>promise_test</tt> alongside synchronous tests.</p>
+<div id="log"></div>
+<script src="../../../testharness.js"></script>
+<script src="../../../testharnessreport.js"></script>
+<script>
+"use strict";
+var sequence = [];
+
+test(function(t) {
+  assert_array_equals(sequence, []);
+  sequence.push(1);
+}, "first synchronous test");
+
+promise_test(function() {
+  assert_array_equals(sequence, [1, 2]);
+
+  return Promise.resolve()
+    .then(function() {
+        assert_array_equals(sequence, [1, 2]);
+        sequence.push(3);
+      });
+}, "first promise_test");;
+
+test(function(t) {
+  assert_array_equals(sequence, [1]);
+  sequence.push(2);
+}, "second synchronous test");
+
+promise_test(function() {
+  assert_array_equals(sequence, [1, 2, 3]);
+
+  return Promise.resolve()
+    .then(function() {
+        assert_array_equals(sequence, [1, 2, 3]);
+      });
+}, "second promise_test");;
+</script>
+<script type="text/json" id="expected">
+{
+  "summarized_status": {
+    "message": null,
+    "status_string": "OK"
+  },
+  "summarized_tests": [
+    {
+      "message": null,
+      "properties": {},
+      "name": "first promise_test",
+      "status_string": "PASS"
+    },
+    {
+      "message": null,
+      "properties": {},
+      "name": "first synchronous test",
+      "status_string": "PASS"
+    },
+    {
+      "message": null,
+      "properties": {},
+      "name": "second promise_test",
+      "status_string": "PASS"
+    },
+    {
+      "message": null,
+      "properties": {},
+      "name": "second synchronous test",
+      "status_string": "PASS"
+    }
+  ],
+  "type": "complete"
+}
+</script>
diff --git a/test/wpt/tests/resources/test/tests/functional/promise.html b/test/wpt/tests/resources/test/tests/functional/promise.html
new file mode 100644
index 00000000000..f35feb0e218
--- /dev/null
+++ b/test/wpt/tests/resources/test/tests/functional/promise.html
@@ -0,0 +1,219 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+<title>Promise Tests</title>
+</head>
+<body>
+<h1>Promise Tests</h1>
+<p>This test demonstrates the use of <tt>promise_test</tt>. Assumes ECMAScript 6
+Promise support. Some failures are expected.</p>
+<div id="log"></div>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script>
+test(
+    function() {
+        var p = new Promise(function(resolve, reject){});
+        assert_true("then" in p);
+        assert_equals(typeof Promise.resolve, "function");
+        assert_equals(typeof Promise.reject, "function");
+    },
+    "Promises are supported in your browser");
+
+promise_test(
+    function() {
+        return Promise.resolve("x")
+            .then(
+                function(value) {
+                    assert_equals(value,
+                                  "x",
+                                  "Fulfilled promise should pass result to " +
+                                  "fulfill reaction.");
+                });
+    },
+    "Promise fulfillment with result");
+
+promise_test(
+    function(t) {
+        return Promise.reject(new Error("fail"))
+            .then(t.unreached_func("Promise should reject"),
+                function(reason) {
+                    assert_true(
+                        reason instanceof Error,
+                        "Rejected promise should pass reason to fulfill reaction.");
+                    assert_equals(
+                        reason.message,
+                        "fail",
+                        "Rejected promise should pass reason to reject reaction.");
+                });
+    },
+    "Promise rejection with result");
+
+promise_test(
+    function() {
+        var resolutions = [];
+        return Promise.resolve("a")
+            .then(
+                function(value) {
+                    resolutions.push(value);
+                    return "b";
+                })
+            .then(
+                function(value) {
+                    resolutions.push(value);
+                    return "c";
+                })
+            .then(
+                function(value) {
+                    resolutions.push(value);
+                    assert_array_equals(resolutions, ["a", "b", "c"]);
+                });
+    },
+    "Chain of promise resolutions");
+
+promise_test(
+    function(t) {
+        var resolutions = [];
+        return Promise.resolve("x")
+            .then(
+                function(value) {
+                    assert_true(false, "Expected failure.");
+                })
+            .then(t.unreached_func("UNEXPECTED FAILURE: Promise should not have resolved."));
+    },
+    "Assertion failure in a fulfill reaction (should FAIL with an expected failure)");
+
+promise_test(
+    function(t) {
+        return new Promise(
+                function(resolve, reject) {
+                    reject(123);
+                })
+            .then(t.unreached_func("UNEXPECTED FAILURE: Fulfill reaction reached after rejection."),
+                  t.unreached_func("Expected failure."));
+    },
+    "unreached_func as reactor (should FAIL with an expected failure)");
+
+promise_test(
+    function() {
+        return true;
+    },
+    "promise_test with function that doesn't return a Promise (should FAIL)");
+
+promise_test(function(){},
+             "promise_test with function that doesn't return anything");
+
+promise_test(
+    function() { return { then: 23 }; },
+    "promise_test that returns a non-thenable (should FAIL)");
+
+promise_test(
+    function() {
+        return Promise.reject("Expected rejection");
+    },
+    "promise_test with unhandled rejection (should FAIL)");
+
+promise_test(
+    function() {
+        return Promise.resolve(10)
+            .then(
+                function(value) {
+                    throw Error("Expected exception.");
+                });
+    },
+    "promise_test with unhandled exception in fulfill reaction (should FAIL)");
+
+promise_test(
+    function(t) {
+        return Promise.reject(10)
+            .then(
+                t.unreached_func("UNEXPECTED FAILURE: Fulfill reaction reached after rejection."),
+                function(value) {
+                    throw Error("Expected exception.");
+                });
+    },
+    "promise_test with unhandled exception in reject reaction (should FAIL)");
+</script>
+<script type="text/json" id="expected">
+{
+  "summarized_status": {
+    "status_string": "OK",
+    "message": null
+  },
+  "summarized_tests": [
+    {
+      "status_string": "FAIL",
+      "name": "Assertion failure in a fulfill reaction (should FAIL with an expected failure)",
+      "message": "assert_true: Expected failure. expected true got false",
+      "properties": {}
+    },
+    {
+      "status_string": "PASS",
+      "name": "Chain of promise resolutions",
+      "message": null,
+      "properties": {}
+    },
+    {
+      "status_string": "PASS",
+      "name": "Promise fulfillment with result",
+      "message": null,
+      "properties": {}
+    },
+    {
+      "status_string": "PASS",
+      "name": "Promise rejection with result",
+      "message": null,
+      "properties": {}
+    },
+    {
+      "status_string": "PASS",
+      "name": "Promises are supported in your browser",
+      "message": null,
+      "properties": {}
+    },
+    {
+      "status_string": "FAIL",
+      "name": "promise_test with function that doesn't return a Promise (should FAIL)",
+      "message": "promise_test: test body must return a 'thenable' object (received an object with no `then` method)",
+      "properties": {}
+    },
+    {
+      "status_string": "FAIL",
+      "name": "promise_test with function that doesn't return anything",
+      "message": "promise_test: test body must return a 'thenable' object (received undefined)",
+      "properties": {}
+    },
+    {
+      "status_string": "FAIL",
+      "name": "promise_test that returns a non-thenable (should FAIL)",
+      "message": "promise_test: test body must return a 'thenable' object (received an object with no `then` method)",
+      "properties": {}
+    },
+    {
+      "status_string": "FAIL",
+      "name": "promise_test with unhandled exception in fulfill reaction (should FAIL)",
+      "message": "promise_test: Unhandled rejection with value: object \"Error: Expected exception.\"",
+      "properties": {}
+    },
+    {
+      "status_string": "FAIL",
+      "name": "promise_test with unhandled exception in reject reaction (should FAIL)",
+      "message": "promise_test: Unhandled rejection with value: object \"Error: Expected exception.\"",
+      "properties": {}
+    },
+    {
+      "status_string": "FAIL",
+      "name": "promise_test with unhandled rejection (should FAIL)",
+      "message": "promise_test: Unhandled rejection with value: \"Expected rejection\"",
+      "properties": {}
+    },
+    {
+      "status_string": "FAIL",
+      "name": "unreached_func as reactor (should FAIL with an expected failure)",
+      "message": "assert_unreached: Expected failure. Reached unreachable code",
+      "properties": {}
+    }
+  ],
+  "type": "complete"
+}
+</script>
diff --git a/test/wpt/tests/resources/test/tests/functional/queue.html b/test/wpt/tests/resources/test/tests/functional/queue.html
new file mode 100644
index 00000000000..0c721286ec2
--- /dev/null
+++ b/test/wpt/tests/resources/test/tests/functional/queue.html
@@ -0,0 +1,130 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+<title>Test queuing synchronous tests</title>
+<script src="../../../testharness.js"></script>
+<script src="../../../testharnessreport.js"></script>
+</head>
+<body>
+<div id="log"></div>
+
+<script>
+"use strict";
+var inInitialTurn = true;
+
+test(function(t) {
+  assert_true(
+    inInitialTurn, "should execute in the initial turn of the event loop"
+  );
+}, "First synchronous test");
+
+test(function(t) {
+  assert_true(
+    inInitialTurn, "should execute in the initial turn of the event loop"
+  );
+}, "Second synchronous test");
+
+async_test(function(t) {
+  assert_true(
+    inInitialTurn, "should execute in the initial turn of the event loop"
+  );
+  t.done();
+}, "First async_test (run in parallel)");
+
+async_test(function(t) {
+  assert_true(
+    inInitialTurn, "should execute in the initial turn of the event loop"
+  );
+  t.done();
+}, "Second async_test (run in parallel)");
+
+test(function(t) {
+  assert_true(
+    inInitialTurn, "should execute in the initial turn of the event loop"
+  );
+}, "Third synchronous test");
+
+promise_test(function(t) {
+  assert_false(
+    inInitialTurn, "should not execute in the initial turn of the event loop"
+  );
+
+  return Promise.resolve();
+}, "promise_test");
+
+async_test(function(t) {
+  assert_true(
+    inInitialTurn, "should execute in the initial turn of the event loop"
+  );
+  t.done();
+}, "Third async_test (run in parallel)");
+
+test(function(t) {
+  assert_true(
+    inInitialTurn, "should execute in the initial turn of the event loop"
+  );
+}, "Fourth synchronous test");
+
+inInitialTurn = false;
+</script>
+<script type="text/json" id="expected">
+{
+  "summarized_status": {
+    "status_string": "OK",
+    "message": null
+  },
+  "summarized_tests": [
+    {
+      "properties": {},
+      "name": "First async_test (run in parallel)",
+      "status_string": "PASS",
+      "message": null
+    },
+    {
+      "properties": {},
+      "name": "First synchronous test",
+      "status_string": "PASS",
+      "message": null
+    },
+    {
+      "properties": {},
+      "name": "Fourth synchronous test",
+      "status_string": "PASS",
+      "message": null
+    },
+    {
+      "properties": {},
+      "name": "Second async_test (run in parallel)",
+      "status_string": "PASS",
+      "message": null
+    },
+    {
+      "properties": {},
+      "name": "Second synchronous test",
+      "status_string": "PASS",
+      "message": null
+    },
+    {
+      "properties": {},
+      "name": "Third async_test (run in parallel)",
+      "status_string": "PASS",
+      "message": null
+    },
+    {
+      "properties": {},
+      "name": "Third synchronous test",
+      "status_string": "PASS",
+      "message": null
+    },
+    {
+      "properties": {},
+      "name": "promise_test",
+      "status_string": "PASS",
+      "message": null
+    }
+  ],
+  "type": "complete"
+}
+</script>
+</body>
+</html>
diff --git a/test/wpt/tests/resources/test/tests/functional/setup-function-worker.js b/test/wpt/tests/resources/test/tests/functional/setup-function-worker.js
new file mode 100644
index 00000000000..82c1456aa64
--- /dev/null
+++ b/test/wpt/tests/resources/test/tests/functional/setup-function-worker.js
@@ -0,0 +1,14 @@
+importScripts("/resources/testharness.js");
+
+// Regression test for https://github.com/web-platform-tests/wpt/issues/27299,
+// where we broke the ability for a setup function in a worker to contain an
+// assertion (even a passing one).
+setup(function() {
+    assert_true(true, "True is true");
+});
+
+// We must define at least one test for the harness, though it is not what we
+// are testing here.
+test(function() {
+    assert_false(false, "False is false");
+}, 'Worker test');
diff --git a/test/wpt/tests/resources/test/tests/functional/setup-worker-service.html b/test/wpt/tests/resources/test/tests/functional/setup-worker-service.html
new file mode 100644
index 00000000000..9f24adac2d0
--- /dev/null
+++ b/test/wpt/tests/resources/test/tests/functional/setup-worker-service.html
@@ -0,0 +1,86 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+<title>Setup function in a service worker</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+</head>
+<body>
+<h1>Setup function in a service worker</h1>
+<p>This test assumes that the browser supports <a href="http://www.w3.org/TR/service-workers/">ServiceWorkers</a>.
+<div id="log"></div>
+
+<script>
+test(function(t) {
+    assert_true("serviceWorker" in navigator,
+                "navigator.serviceWorker exists");
+}, "Browser supports ServiceWorker");
+
+promise_test(function() {
+    // Since the service worker registration could be in an indeterminate
+    // state (due to, for example, a previous test run failing), we start by
+    // unregstering our service worker and then registering it again.
+    var scope = "service-worker-scope";
+    var worker_url = "setup-function-worker.js";
+
+    return navigator.serviceWorker.register(worker_url, {scope: scope})
+        .then(function(registration) {
+            return registration.unregister();
+        }).then(function() {
+            return navigator.serviceWorker.register(worker_url, {scope: scope});
+        }).then(function(registration) {
+            add_completion_callback(function() {
+                registration.unregister();
+            });
+
+            return new Promise(function(resolve) {
+                registration.addEventListener("updatefound", function() {
+                    resolve(registration.installing);
+                });
+            });
+        }).then(function(worker) {
+            fetch_tests_from_worker(worker);
+        });
+}, "Register ServiceWorker");
+</script>
+<script type="text/json" id="expected">
+{
+  "summarized_status": {
+    "status_string": "OK",
+    "message": null
+  },
+  "summarized_tests": [
+    {
+      "status_string": "PASS",
+      "name": "Browser supports ServiceWorker",
+      "properties": {},
+      "message": null
+    },
+    {
+      "message": null,
+      "name": "Register ServiceWorker",
+      "properties": {},
+      "status_string": "PASS"
+    },
+    {
+      "message": null,
+      "name": "Worker test",
+      "properties": {},
+      "status_string": "PASS"
+    }
+  ],
+  "summarized_asserts": [
+    {
+      "assert_name": "assert_true",
+      "test": "Browser supports ServiceWorker",
+      "args": [
+        "true",
+        "\"navigator.serviceWorker exists\""
+      ],
+      "status": 0
+    }
+  ],
+  "type": "complete"
+}
+</script>
+</body>
diff --git a/test/wpt/tests/resources/test/tests/functional/single-page-test-fail.html b/test/wpt/tests/resources/test/tests/functional/single-page-test-fail.html
new file mode 100644
index 00000000000..8bbd530c48d
--- /dev/null
+++ b/test/wpt/tests/resources/test/tests/functional/single-page-test-fail.html
@@ -0,0 +1,28 @@
+<!DOCTYPE HTML>
+<title>Example with file_is_test (should fail)</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script>
+setup({ single_test: true });
+onload = function() {
+  assert_true(false);
+  done();
+}
+</script>
+<script type="text/json" id="expected">
+{
+  "summarized_status": {
+    "status_string": "OK",
+    "message": null
+  },
+  "summarized_tests": [
+    {
+      "status_string": "FAIL",
+      "name": "Example with file_is_test (should fail)",
+      "properties": {},
+      "message": "uncaught exception: Error: assert_true: expected true got false"
+    }
+  ],
+  "type": "complete"
+}
+</script>
diff --git a/test/wpt/tests/resources/test/tests/functional/single-page-test-no-assertions.html b/test/wpt/tests/resources/test/tests/functional/single-page-test-no-assertions.html
new file mode 100644
index 00000000000..9b39d2a02cc
--- /dev/null
+++ b/test/wpt/tests/resources/test/tests/functional/single-page-test-no-assertions.html
@@ -0,0 +1,25 @@
+<!DOCTYPE HTML>
+<title>Example single page test with no asserts</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script>
+setup({ single_test: true });
+done();
+</script>
+<script type="text/json" id="expected">
+{
+  "summarized_status": {
+    "status_string": "OK",
+    "message": null
+  },
+  "summarized_tests": [
+    {
+      "status_string": "PASS",
+      "name": "Example single page test with no asserts",
+      "properties": {},
+      "message": null
+    }
+  ],
+  "type": "complete"
+}
+</script>
diff --git a/test/wpt/tests/resources/test/tests/functional/single-page-test-no-body.html b/test/wpt/tests/resources/test/tests/functional/single-page-test-no-body.html
new file mode 100644
index 00000000000..cb018f4dae5
--- /dev/null
+++ b/test/wpt/tests/resources/test/tests/functional/single-page-test-no-body.html
@@ -0,0 +1,26 @@
+<!DOCTYPE HTML>
+<title>Example single page test with no body</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script>
+setup({ single_test: true });
+assert_true(true);
+done();
+</script>
+<script type="text/json" id="expected">
+{
+  "summarized_status": {
+    "status_string": "OK",
+    "message": null
+  },
+  "summarized_tests": [
+    {
+      "status_string": "PASS",
+      "name": "Example single page test with no body",
+      "properties": {},
+      "message": null
+    }
+  ],
+  "type": "complete"
+}
+</script>
diff --git a/test/wpt/tests/resources/test/tests/functional/single-page-test-pass.html b/test/wpt/tests/resources/test/tests/functional/single-page-test-pass.html
new file mode 100644
index 00000000000..e143e22f3c7
--- /dev/null
+++ b/test/wpt/tests/resources/test/tests/functional/single-page-test-pass.html
@@ -0,0 +1,28 @@
+<!DOCTYPE HTML>
+<title>Example with file_is_test</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script>
+setup({ single_test: true });
+onload = function() {
+  assert_true(true);
+  done();
+}
+</script>
+<script type="text/json" id="expected">
+{
+  "summarized_status": {
+    "status_string": "OK",
+    "message": null
+  },
+  "summarized_tests": [
+    {
+      "status_string": "PASS",
+      "name": "Example with file_is_test",
+      "properties": {},
+      "message": null
+    }
+  ],
+  "type": "complete"
+}
+</script>
diff --git a/test/wpt/tests/resources/test/tests/functional/step_wait.html b/test/wpt/tests/resources/test/tests/functional/step_wait.html
new file mode 100644
index 00000000000..ae3442c7595
--- /dev/null
+++ b/test/wpt/tests/resources/test/tests/functional/step_wait.html
@@ -0,0 +1,57 @@
+<!doctype html>
+<title>Tests for step_wait</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<div id=log></div>
+<script>
+promise_test(async t => {
+  let x = 1;
+  Promise.resolve().then(() => ++x);
+  await t.step_wait(() => x === 1);
+  assert_equals(x, 2);
+}, "Basic step_wait() test");
+
+promise_test(async t => {
+  let cond = false;
+  let x = 0;
+  setTimeout(() => cond = true, 100);
+  await t.step_wait(() => {
+    ++x;
+    return cond;
+  });
+  assert_equals(x, 2);
+}, "step_wait() isn't invoked too often");
+
+promise_test(async t => {
+  await t.step_wait(); // Throws
+}, "step_wait() takes an argument");
+</script>
+<script type="text/json" id="expected">
+{
+  "summarized_tests": [
+    {
+      "name": "Basic step_wait() test",
+      "message": null,
+      "properties": {},
+      "status_string": "PASS"
+    },
+    {
+      "name": "step_wait() isn't invoked too often",
+      "message": null,
+      "properties": {},
+      "status_string": "PASS"
+    },
+    {
+      "name": "step_wait() takes an argument",
+      "message": "cond is not a function",
+      "properties": {},
+      "status_string": "FAIL"
+    }
+  ],
+  "type": "complete",
+  "summarized_status": {
+    "status_string": "OK",
+    "message": null
+  }
+}
+</script>
diff --git a/test/wpt/tests/resources/test/tests/functional/step_wait_func.html b/test/wpt/tests/resources/test/tests/functional/step_wait_func.html
new file mode 100644
index 00000000000..9fed18a3e20
--- /dev/null
+++ b/test/wpt/tests/resources/test/tests/functional/step_wait_func.html
@@ -0,0 +1,49 @@
+<!doctype html>
+<title>Tests for step_wait_func and step_wait_func_done</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<div id=log></div>
+<script>
+async_test(t => {
+  let x = 0;
+  let step_x = 0;
+  setTimeout(() => ++x, 100);
+  t.step_wait_func(() => {
+    ++step_x;
+    return x === 1;
+  }, () => {
+    assert_equals(step_x, 2);
+    t.done();
+  });
+}, "Basic step_wait_func() test");
+
+async_test(t => {
+  let x = 0;
+  setTimeout(() => ++x, 100);
+  t.step_wait_func_done(() => true, () => assert_equals(x, 0));
+}, "Basic step_wait_func_done() test");
+
+</script>
+<script type="text/json" id="expected">
+{
+  "summarized_status": {
+    "message": null,
+    "status_string": "OK"
+  },
+  "summarized_tests": [
+    {
+      "properties": {},
+      "message": null,
+      "name": "Basic step_wait_func() test",
+      "status_string": "PASS"
+    },
+    {
+      "properties": {},
+      "message": null,
+      "name": "Basic step_wait_func_done() test",
+      "status_string": "PASS"
+    }
+  ],
+  "type": "complete"
+}
+</script>
diff --git a/test/wpt/tests/resources/test/tests/functional/task-scheduling-promise-test.html b/test/wpt/tests/resources/test/tests/functional/task-scheduling-promise-test.html
new file mode 100644
index 00000000000..9d8e5c11cc9
--- /dev/null
+++ b/test/wpt/tests/resources/test/tests/functional/task-scheduling-promise-test.html
@@ -0,0 +1,241 @@
+<!doctype html>
+<title>testharness.js - task scheduling</title>
+<script src="../../../testharness.js"></script>
+<script src="../../../testharnessreport.js"></script>
+<script>
+var sameTask = null;
+var sameMicrotask = null;
+var expectedError = new Error('This error is expected');
+
+promise_test(function() {
+  return Promise.resolve()
+    .then(function() {
+        sameMirotask = true;
+        Promise.resolve().then(() => sameMicrotask = false);
+      });
+}, 'promise test without cleanup #1');
+
+promise_test(function() {
+  assert_false(sameMicrotask);
+
+  return Promise.resolve();
+}, 'sub-test with 0 cleanup functions executes in distinct microtask from a passing sub-test');
+
+promise_test(function() {
+  return Promise.resolve()
+    .then(function() {
+        sameMirotask = true;
+        Promise.resolve().then(() => sameMicrotask = false);
+        throw expectedError;
+      });
+}, 'failing promise test without cleanup #1');
+
+promise_test(function() {
+  assert_false(sameMicrotask);
+
+  return Promise.resolve();
+}, 'sub-test with 0 cleanup functions executes in distinct microtask from a failing sub-test');
+
+promise_test(function(t) {
+  t.add_cleanup(function() {});
+
+  return Promise.resolve()
+    .then(function() {
+        sameMirotask = true;
+        Promise.resolve().then(() => sameMicrotask = false);
+      });
+}, 'promise test with cleanup #1');
+
+promise_test(function() {
+  assert_false(sameMicrotask);
+
+  return Promise.resolve();
+}, 'sub-test with some cleanup functions executes in distinct microtask from a passing sub-test');
+
+promise_test(function(t) {
+  t.add_cleanup(function() {});
+
+  return Promise.resolve()
+    .then(function() {
+        sameMirotask = true;
+        Promise.resolve().then(() => sameMicrotask = false);
+        throw expectedError;
+      });
+}, 'failing promise test with cleanup #1');
+
+promise_test(function() {
+  assert_false(sameMicrotask);
+
+  return Promise.resolve();
+}, 'sub-test with some cleanup functions executes in distinct microtask from a failing sub-test');
+
+promise_test(function(t) {
+  return Promise.resolve()
+    .then(function() {
+        sameTask = true;
+        t.step_timeout(() => sameTask = false, 0);
+      });
+}, 'promise test without cleanup #2');
+
+promise_test(function() {
+  assert_true(sameTask);
+
+  return Promise.resolve();
+}, 'sub-test with 0 cleanup functions executes in the same task as a passing sub-test');
+
+promise_test(function(t) {
+  return Promise.resolve()
+    .then(function() {
+        sameTask = true;
+        t.step_timeout(() => sameTask = false, 0);
+        throw expectedError;
+      });
+}, 'failing promise test without cleanup #2');
+
+promise_test(function() {
+  assert_true(sameTask);
+
+  return Promise.resolve();
+}, 'sub-test with 0 cleanup functions executes in the same task as a failing sub-test');
+
+promise_test(function(t) {
+  t.add_cleanup(function() {});
+
+  return Promise.resolve()
+    .then(function() {
+        sameTask = true;
+        t.step_timeout(() => sameTask = false, 0);
+      });
+}, 'promise test with cleanup #2');
+
+promise_test(function() {
+  assert_true(sameTask);
+
+  return Promise.resolve();
+}, 'sub-test with some cleanup functions executes in the same task as a passing sub-test');
+
+promise_test(function(t) {
+  t.add_cleanup(function() {});
+
+  return Promise.resolve()
+    .then(function() {
+        sameTask = true;
+        t.step_timeout(() => sameTask = false, 0);
+        throw expectedError;
+      });
+}, 'failing promise test with cleanup #2');
+
+promise_test(function() {
+  assert_true(sameTask);
+
+  return Promise.resolve();
+}, 'sub-test with some cleanup functions executes in the same task as a failing sub-test');
+</script>
+
+<script type="text/json" id="expected">
+{
+    "summarized_status": {
+        "message": null,
+        "status_string": "OK"
+    },
+    "summarized_tests": [
+        {
+            "message": "promise_test: Unhandled rejection with value: object \"Error: This error is expected\"",
+            "name": "failing promise test with cleanup #1",
+            "properties": {},
+            "status_string": "FAIL"
+        },
+        {
+            "message": "promise_test: Unhandled rejection with value: object \"Error: This error is expected\"",
+            "name": "failing promise test with cleanup #2",
+            "properties": {},
+            "status_string": "FAIL"
+        },
+        {
+            "message": "promise_test: Unhandled rejection with value: object \"Error: This error is expected\"",
+            "name": "failing promise test without cleanup #1",
+            "properties": {},
+            "status_string": "FAIL"
+        },
+        {
+            "message": "promise_test: Unhandled rejection with value: object \"Error: This error is expected\"",
+            "name": "failing promise test without cleanup #2",
+            "properties": {},
+            "status_string": "FAIL"
+        },
+        {
+            "message": null,
+            "name": "promise test with cleanup #1",
+            "properties": {},
+            "status_string": "PASS"
+        },
+        {
+            "message": null,
+            "name": "promise test with cleanup #2",
+            "properties": {},
+            "status_string": "PASS"
+        },
+        {
+            "message": null,
+            "name": "promise test without cleanup #1",
+            "properties": {},
+            "status_string": "PASS"
+        },
+        {
+            "message": null,
+            "name": "promise test without cleanup #2",
+            "properties": {},
+            "status_string": "PASS"
+        },
+        {
+            "message": null,
+            "name": "sub-test with 0 cleanup functions executes in distinct microtask from a failing sub-test",
+            "properties": {},
+            "status_string": "PASS"
+        },
+        {
+            "message": null,
+            "name": "sub-test with 0 cleanup functions executes in distinct microtask from a passing sub-test",
+            "properties": {},
+            "status_string": "PASS"
+        },
+        {
+            "message": null,
+            "name": "sub-test with 0 cleanup functions executes in the same task as a failing sub-test",
+            "properties": {},
+            "status_string": "PASS"
+        },
+        {
+            "message": null,
+            "name": "sub-test with 0 cleanup functions executes in the same task as a passing sub-test",
+            "properties": {},
+            "status_string": "PASS"
+        },
+        {
+            "message": null,
+            "name": "sub-test with some cleanup functions executes in distinct microtask from a failing sub-test",
+            "properties": {},
+            "status_string": "PASS"
+        },
+        {
+            "message": null,
+            "name": "sub-test with some cleanup functions executes in distinct microtask from a passing sub-test",
+            "properties": {},
+            "status_string": "PASS"
+        },
+        {
+            "message": null,
+            "name": "sub-test with some cleanup functions executes in the same task as a failing sub-test",
+            "properties": {},
+            "status_string": "PASS"
+        },
+        {
+            "message": null,
+            "name": "sub-test with some cleanup functions executes in the same task as a passing sub-test",
+            "properties": {},
+            "status_string": "PASS"
+        }
+    ],
+    "type": "complete"
+}
+</script>
diff --git a/test/wpt/tests/resources/test/tests/functional/task-scheduling-test.html b/test/wpt/tests/resources/test/tests/functional/task-scheduling-test.html
new file mode 100644
index 00000000000..035844448de
--- /dev/null
+++ b/test/wpt/tests/resources/test/tests/functional/task-scheduling-test.html
@@ -0,0 +1,141 @@
+<!doctype html>
+<title>testharness.js - task scheduling</title>
+<script src="../../../testharness.js"></script>
+<script src="../../../testharnessreport.js"></script>
+<script>
+var sameMicrotask = null;
+var expectedError = new Error('This error is expected');
+
+// Derived from `immediate`
+// https://github.com/calvinmetcalf/immediate/blob/c353bd2106648cee1d525bfda22cfc4456e69c0e/lib/mutation.js
+function microTask(callback) {
+  var observer = new MutationObserver(callback);
+  var element = document.createTextNode('');
+  observer.observe(element, {
+    characterData: true
+  });
+
+  element.data = true;
+};
+
+async_test(function(t) {
+  var microtask_ran = false;
+
+  t.step_timeout(t.step_func(function() {
+    assert_true(microtask_ran, 'function registered as a microtask was executed before task');
+    t.done();
+  }), 0);
+
+  microTask(function() {
+    microtask_ran = true;
+  });
+}, 'precondition: microtask creation logic functions as expected');
+
+test(function() {
+  sameMicrotask = true;
+  microTask(function() { sameMicrotask = false; });
+}, 'synchronous test without cleanup');
+
+test(function() {
+  assert_true(sameMicrotask);
+}, 'sub-test with 0 cleanup functions executes in the same microtask as a passing sub-test');
+
+test(function() {
+  sameMicrotask = true;
+  microTask(function() { sameMicrotask = false; });
+  throw expectedError;
+}, 'failing synchronous test without cleanup');
+
+test(function() {
+  assert_true(sameMicrotask);
+}, 'sub-test with 0 cleanup functions executes in the same microtask as a failing sub-test');
+
+test(function(t) {
+  t.add_cleanup(function() {});
+
+  sameMicrotask = true;
+  microTask(function() { sameMicrotask = false; });
+}, 'synchronous test with cleanup');
+
+test(function() {
+  assert_true(sameMicrotask);
+}, 'sub-test with some cleanup functions executes in the same microtask as a passing sub-test');
+
+test(function(t) {
+  t.add_cleanup(function() {});
+
+  sameMicrotask = true;
+  microTask(function() { sameMicrotask = false; });
+  throw expectedError;
+}, 'failing synchronous test with cleanup');
+
+test(function() {
+  assert_true(sameMicrotask);
+}, 'sub-test with some cleanup functions executes in the same microtask as a failing sub-test');
+</script>
+
+<script type="text/json" id="expected">
+{
+    "summarized_status": {
+        "message": null,
+        "status_string": "OK"
+    },
+    "summarized_tests": [
+        {
+            "message": "This error is expected",
+            "name": "failing synchronous test with cleanup",
+            "properties": {},
+            "status_string": "FAIL"
+        },
+        {
+            "message": "This error is expected",
+            "name": "failing synchronous test without cleanup",
+            "properties": {},
+            "status_string": "FAIL"
+        },
+        {
+            "message": null,
+            "name": "precondition: microtask creation logic functions as expected",
+            "properties": {},
+            "status_string": "PASS"
+        },
+        {
+            "message": null,
+            "name": "sub-test with 0 cleanup functions executes in the same microtask as a failing sub-test",
+            "properties": {},
+            "status_string": "PASS"
+        },
+        {
+            "message": null,
+            "name": "sub-test with 0 cleanup functions executes in the same microtask as a passing sub-test",
+            "properties": {},
+            "status_string": "PASS"
+        },
+        {
+            "message": null,
+            "name": "sub-test with some cleanup functions executes in the same microtask as a failing sub-test",
+            "properties": {},
+            "status_string": "PASS"
+        },
+        {
+            "message": null,
+            "name": "sub-test with some cleanup functions executes in the same microtask as a passing sub-test",
+            "properties": {},
+            "status_string": "PASS"
+        },
+        {
+            "message": null,
+            "name": "synchronous test with cleanup",
+            "properties": {},
+            "status_string": "PASS"
+        },
+        {
+            "message": null,
+            "name": "synchronous test without cleanup",
+            "properties": {},
+            "status_string": "PASS"
+        }
+    ],
+    "type": "complete"
+}
+</script>
diff --git a/test/wpt/tests/resources/test/tests/functional/uncaught-exception-handle.html b/test/wpt/tests/resources/test/tests/functional/uncaught-exception-handle.html
new file mode 100644
index 00000000000..764b0c4055b
--- /dev/null
+++ b/test/wpt/tests/resources/test/tests/functional/uncaught-exception-handle.html
@@ -0,0 +1,33 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+<title>Harness Handling Uncaught Exception</title>
+</head>
+<script src="/resources/testharness.js"></script>
+
+<body>
+<h1>Harness Handling Uncaught Exception</h1>
+<div id="log"></div>
+<script>
+var t = async_test("This should show a harness status of 'Error' and a test status of 'Not Run'");
+throw new Error("Example Error");
+</script>
+<script type="text/json" id="expected">
+{
+  "summarized_status": {
+    "status_string": "ERROR",
+    "message": "Error: Example Error"
+  },
+  "summarized_tests": [
+    {
+      "status_string": "NOTRUN",
+      "name": "This should show a harness status of 'Error' and a test status of 'Not Run'",
+      "properties": {},
+      "message": null
+    }
+  ],
+  "type": "complete"
+}
+</script>
+</body>
+</html>
diff --git a/test/wpt/tests/resources/test/tests/functional/uncaught-exception-ignore.html b/test/wpt/tests/resources/test/tests/functional/uncaught-exception-ignore.html
new file mode 100644
index 00000000000..6bd0ddbb0d2
--- /dev/null
+++ b/test/wpt/tests/resources/test/tests/functional/uncaught-exception-ignore.html
@@ -0,0 +1,35 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+<title>Harness Ignoring Uncaught Exception</title>
+</head>
+<script src="/resources/testharness.js"></script>
+
+<body>
+<h1>Harness Ignoring Uncaught Exception</h1>
+<div id="log"></div>
+<script>
+setup({allow_uncaught_exception:true});
+var t = async_test("setup({allow_uncaught_exception:true}) should allow tests to pass even if there is an exception");
+onerror = t.step_func(function() {t.done()});
+throw new Error("Example Error");
+</script>
+<script type="text/json" id="expected">
+{
+  "summarized_status": {
+    "status_string": "OK",
+    "message": null
+  },
+  "summarized_tests": [
+    {
+      "status_string": "PASS",
+      "name": "setup({allow_uncaught_exception:true}) should allow tests to pass even if there is an exception",
+      "properties": {},
+      "message": null
+    }
+  ],
+  "type": "complete"
+}
+</script>
+</body>
+</html>
diff --git a/test/wpt/tests/resources/test/tests/functional/worker-dedicated-uncaught-allow.html b/test/wpt/tests/resources/test/tests/functional/worker-dedicated-uncaught-allow.html
new file mode 100644
index 00000000000..ba28d4914f2
--- /dev/null
+++ b/test/wpt/tests/resources/test/tests/functional/worker-dedicated-uncaught-allow.html
@@ -0,0 +1,45 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+<title>Dedicated Worker Tests - Allowed Uncaught Exception</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+</head>
+<body>
+<h1>Dedicated Web Worker Tests - Allowed Uncaught Exception</h1>
+<p>Demonstrates running <tt>testharness</tt> based tests inside a dedicated web worker.
+<p>The test harness is expected to pass despite an uncaught exception in a worker because that worker is configured to allow uncaught exceptions.</p>
+<div id="log"></div>
+
+<script>
+test(function(t) {
+        assert_true("Worker" in self, "Browser should support Workers");
+    },
+    "Browser supports Workers");
+
+fetch_tests_from_worker(new Worker("worker-uncaught-allow.js"));
+</script>
+<script type="text/json" id="expected">
+{
+  "summarized_status": {
+    "status_string": "OK",
+    "message": null
+  },
+  "summarized_tests": [
+    {
+      "status_string": "PASS",
+      "name": "Browser supports Workers",
+      "properties": {},
+      "message": null
+    },
+    {
+      "status_string": "PASS",
+      "name": "onerror event is triggered",
+      "properties": {},
+      "message": null
+    }
+  ],
+  "type": "complete"
+}
+</script>
+</body>
diff --git a/test/wpt/tests/resources/test/tests/functional/worker-dedicated-uncaught-single.html b/test/wpt/tests/resources/test/tests/functional/worker-dedicated-uncaught-single.html
new file mode 100644
index 00000000000..486e067114c
--- /dev/null
+++ b/test/wpt/tests/resources/test/tests/functional/worker-dedicated-uncaught-single.html
@@ -0,0 +1,56 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+<title>Dedicated Worker Tests - Uncaught Exception in Single-Page Test</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+</head>
+<body>
+<h1>Dedicated Web Worker Tests - Uncaught Exception in Single-Page Test</h1>
+<p>Demonstrates running <tt>testharness</tt> based tests inside a dedicated web worker.
+<p>The test harness is expected to pass despite an uncaught exception in a worker because that worker is a single-page test.</p>
+<div id="log"></div>
+
+<script>
+test(function(t) {
+        assert_true("Worker" in self, "Browser should support Workers");
+    },
+    "Browser supports Workers");
+
+fetch_tests_from_worker(new Worker("worker-uncaught-single.js"));
+
+test(function(t) {
+        assert_false(false, "False is false");
+    },
+    "Test running on main document.");
+</script>
+<script type="text/json" id="expected">
+{
+  "summarized_status": {
+    "status_string": "OK",
+    "message": null
+  },
+  "summarized_tests": [
+    {
+      "status_string": "PASS",
+      "name": "Browser supports Workers",
+      "properties": {},
+      "message": null
+    },
+    {
+      "status_string": "PASS",
+      "name": "Test running on main document.",
+      "properties": {},
+      "message": null
+    },
+    {
+      "status_string": "FAIL",
+      "name": "worker-uncaught-single",
+      "properties": {},
+      "message": "Error: This failure is expected."
+    }
+  ],
+  "type": "complete"
+}
+</script>
+</body>
diff --git a/test/wpt/tests/resources/test/tests/functional/worker-dedicated.sub.html b/test/wpt/tests/resources/test/tests/functional/worker-dedicated.sub.html
new file mode 100644
index 00000000000..efd703c7601
--- /dev/null
+++ b/test/wpt/tests/resources/test/tests/functional/worker-dedicated.sub.html
@@ -0,0 +1,88 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+<title>Dedicated Worker Tests</title>
+<script src="../../../testharness.js"></script>
+<script src="../../../testharnessreport.js"></script>
+</head>
+<body>
+<h1>Dedicated Web Worker Tests</h1>
+<p>Demonstrates running <tt>testharness</tt> based tests inside a dedicated web worker.
+<p>The test harness is expected to fail due to an uncaught exception in one worker.</p>
+<div id="log"></div>
+
+<script>
+test(function(t) {
+        assert_true("Worker" in self, "Browser should support Workers");
+    },
+    "Browser supports Workers");
+
+fetch_tests_from_worker(new Worker("worker.js"));
+
+fetch_tests_from_worker(new Worker("worker-error.js"));
+
+test(function(t) {
+        assert_false(false, "False is false");
+    },
+    "Test running on main document.");
+</script>
+<script type="text/json" id="expected">
+{
+  "summarized_status": {
+    "status_string": "ERROR",
+    "message": "Error: This failure is expected."
+  },
+  "summarized_tests": [
+    {
+      "status_string": "PASS",
+      "name": "Browser supports Workers",
+      "properties": {},
+      "message": null
+    },
+    {
+      "status_string": "PASS",
+      "name": "Test running on main document.",
+      "properties": {},
+      "message": null
+    },
+    {
+      "status_string": "PASS",
+      "name": "Worker async_test that completes successfully",
+      "properties": {},
+      "message": null
+    },
+    {
+      "status_string": "PASS",
+      "name": "Worker test that completes successfully",
+      "properties": {},
+      "message": null
+    },
+    {
+      "status_string": "PASS",
+      "name": "worker test that completes successfully before exception",
+      "properties": {},
+      "message": null
+    },
+    {
+      "status_string": "NOTRUN",
+      "name": "Worker test that doesn't run ('NOT RUN')",
+      "properties": {},
+      "message": null
+    },
+    {
+      "status_string": "FAIL",
+      "name": "Worker test that fails ('FAIL')",
+      "properties": {},
+      "message": "assert_true: Failing test expected true got false"
+    },
+    {
+      "status_string": "TIMEOUT",
+      "name": "Worker test that times out ('TIMEOUT')",
+      "properties": {},
+      "message": "Test timed out"
+    }
+  ],
+  "type": "complete"
+}
+</script>
+</body>
diff --git a/test/wpt/tests/resources/test/tests/functional/worker-error.js b/test/wpt/tests/resources/test/tests/functional/worker-error.js
new file mode 100644
index 00000000000..7b89602f04b
--- /dev/null
+++ b/test/wpt/tests/resources/test/tests/functional/worker-error.js
@@ -0,0 +1,8 @@
+importScripts("/resources/testharness.js");
+
+// The following sub-test ensures that the worker is not interpreted as a
+// single-page test.  The subsequent uncaught exception should therefore be
+// interpreted as a harness error rather than a single-page test failure.
+test(function() {}, "worker test that completes successfully before exception");
+
+throw new Error("This failure is expected.");
diff --git a/test/wpt/tests/resources/test/tests/functional/worker-service.html b/test/wpt/tests/resources/test/tests/functional/worker-service.html
new file mode 100644
index 00000000000..2e07746e622
--- /dev/null
+++ b/test/wpt/tests/resources/test/tests/functional/worker-service.html
@@ -0,0 +1,115 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+<title>Example with a service worker</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+</head>
+<body>
+<h1>Service Worker Tests</h1>
+<p>Demonstrates running <tt>testharness</tt> based tests inside a service worker.
+<p>The test harness should time out due to one of the tests inside the worker timing out.
+<p>This test assumes that the browser supports <a href="http://www.w3.org/TR/service-workers/">ServiceWorkers</a>.
+<div id="log"></div>
+
+<script>
+test(
+    function(t) {
+        assert_true("serviceWorker" in navigator,
+                    "navigator.serviceWorker exists");
+    },
+    "Browser supports ServiceWorker");
+
+promise_test(
+    function() {
+        // Since the service worker registration could be in an indeterminate
+        // state (due to, for example, a previous test run failing), we start by
+        // unregstering our service worker and then registering it again.
+        var scope = "service-worker-scope";
+        var worker_url = "worker.js";
+
+        return navigator.serviceWorker.register(worker_url, {scope: scope})
+            .then(
+                function(registration) {
+                    return registration.unregister();
+                })
+            .then(
+                function() {
+                    return navigator.serviceWorker.register(worker_url, {scope: scope});
+                })
+            .then(
+                function(registration) {
+                    add_completion_callback(
+                        function() {
+                            registration.unregister();
+                        });
+
+                    return new Promise(
+                        function(resolve) {
+                            registration.addEventListener("updatefound",
+                                function() {
+                                    resolve(registration.installing);
+                                });
+                        });
+                })
+            .then(
+                function(worker) {
+                    fetch_tests_from_worker(worker);
+                });
+    },
+    "Register ServiceWorker");
+</script>
+<script type="text/json" id="expected">
+{
+  "summarized_status": {
+    "status_string": "TIMEOUT",
+    "message": null
+  },
+  "summarized_tests": [
+    {
+      "status_string": "PASS",
+      "name": "Browser supports ServiceWorker",
+      "properties": {},
+      "message": null
+    },
+    {
+      "status_string": "PASS",
+      "name": "Register ServiceWorker",
+      "properties": {},
+      "message": null
+    },
+    {
+      "status_string": "PASS",
+      "name": "Worker async_test that completes successfully",
+      "properties": {},
+      "message": null
+    },
+    {
+      "status_string": "PASS",
+      "name": "Worker test that completes successfully",
+      "properties": {},
+      "message": null
+    },
+    {
+      "status_string": "NOTRUN",
+      "name": "Worker test that doesn't run ('NOT RUN')",
+      "properties": {},
+      "message": null
+    },
+    {
+      "status_string": "FAIL",
+      "name": "Worker test that fails ('FAIL')",
+      "properties": {},
+      "message": "assert_true: Failing test expected true got false"
+    },
+    {
+      "status_string": "TIMEOUT",
+      "name": "Worker test that times out ('TIMEOUT')",
+      "properties": {},
+      "message": "Test timed out"
+    }
+  ],
+  "type": "complete"
+}
+</script>
+</body>
diff --git a/test/wpt/tests/resources/test/tests/functional/worker-shared.html b/test/wpt/tests/resources/test/tests/functional/worker-shared.html
new file mode 100644
index 00000000000..e26f17dec27
--- /dev/null
+++ b/test/wpt/tests/resources/test/tests/functional/worker-shared.html
@@ -0,0 +1,73 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+<title>Example with a shared worker</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+</head>
+<body>
+<h1>Shared Web Worker Tests</h1>
+<p>Demonstrates running <tt>testharness</tt> based tests inside a shared worker.
+<p>The test harness should time out due to one of the tests in the worker timing out.
+<p>This test assumes that the browser supports <a href="http://www.w3.org/TR/workers/#shared-workers-and-the-sharedworker-interface">shared web workers</a>.
+<div id="log"></div>
+
+<script>
+test(
+    function(t) {
+        assert_true("SharedWorker" in self,
+                    "Browser should support SharedWorkers");
+    },
+    "Browser supports SharedWorkers");
+
+fetch_tests_from_worker(new SharedWorker("worker.js",
+                                         "My shared worker"));
+</script>
+<script type="text/json" id="expected">
+{
+  "summarized_status": {
+    "status_string": "TIMEOUT",
+    "message": null
+  },
+  "summarized_tests": [
+    {
+      "status_string": "PASS",
+      "name": "Browser supports SharedWorkers",
+      "properties": {},
+      "message": null
+    },
+    {
+      "message": null,
+      "name": "Worker async_test that completes successfully",
+      "properties": {},
+      "status_string": "PASS"
+    },
+    {
+      "message": null,
+      "name": "Worker test that completes successfully",
+      "properties": {},
+      "status_string": "PASS"
+    },
+    {
+      "message": null,
+      "name": "Worker test that doesn't run ('NOT RUN')",
+      "properties": {},
+      "status_string": "NOTRUN"
+    },
+    {
+      "message": "assert_true: Failing test expected true got false",
+      "name": "Worker test that fails ('FAIL')",
+      "properties": {},
+      "status_string": "FAIL"
+    },
+    {
+      "message": "Test timed out",
+      "name": "Worker test that times out ('TIMEOUT')",
+      "properties": {},
+      "status_string": "TIMEOUT"
+    }
+  ],
+  "type": "complete"
+}
+</script>
+</body>
diff --git a/test/wpt/tests/resources/test/tests/functional/worker-uncaught-allow.js b/test/wpt/tests/resources/test/tests/functional/worker-uncaught-allow.js
new file mode 100644
index 00000000000..6925d59349a
--- /dev/null
+++ b/test/wpt/tests/resources/test/tests/functional/worker-uncaught-allow.js
@@ -0,0 +1,19 @@
+importScripts("/resources/testharness.js");
+
+setup({allow_uncaught_exception:true});
+
+async_test(function(t) {
+  onerror = function() {
+    // Further delay the test's completion to ensure that the worker's
+    // `onerror` handler does not influence results in the parent context.
+    setTimeout(function() {
+      t.done();
+    }, 0);
+  };
+
+  setTimeout(function() {
+    throw new Error("This error is expected.");
+  }, 0);
+}, 'onerror event is triggered');
+
+done();
diff --git a/test/wpt/tests/resources/test/tests/functional/worker-uncaught-single.js b/test/wpt/tests/resources/test/tests/functional/worker-uncaught-single.js
new file mode 100644
index 00000000000..c04542b2f57
--- /dev/null
+++ b/test/wpt/tests/resources/test/tests/functional/worker-uncaught-single.js
@@ -0,0 +1,8 @@
+importScripts("/resources/testharness.js");
+
+setup({ single_test: true });
+
+// Because this script enables the `single_test` configuration option, it
+// should be interpreted as a single-page test, and the uncaught exception
+// should be reported as a test failure (harness status: OK).
+throw new Error("This failure is expected.");
diff --git a/test/wpt/tests/resources/test/tests/functional/worker.js b/test/wpt/tests/resources/test/tests/functional/worker.js
new file mode 100644
index 00000000000..a923bc2d89e
--- /dev/null
+++ b/test/wpt/tests/resources/test/tests/functional/worker.js
@@ -0,0 +1,34 @@
+importScripts("/resources/testharness.js");
+
+test(
+    function(test) {
+        assert_true(true, "True is true");
+    },
+    "Worker test that completes successfully");
+
+test(
+    function(test) {
+        assert_true(false, "Failing test");
+    },
+    "Worker test that fails ('FAIL')");
+
+async_test(
+    function(test) {
+        assert_true(true, "True is true");
+    },
+    "Worker test that times out ('TIMEOUT')");
+
+async_test("Worker test that doesn't run ('NOT RUN')");
+
+async_test(
+    function(test) {
+        self.setTimeout(
+            function() {
+                test.done();
+            },
+            0);
+    },
+    "Worker async_test that completes successfully");
+
+// An explicit done() is required for dedicated and shared web workers.
+done();
diff --git a/test/wpt/tests/resources/test/tests/unit/IdlArray/is_json_type.html b/test/wpt/tests/resources/test/tests/unit/IdlArray/is_json_type.html
new file mode 100644
index 00000000000..18e83a8e893
--- /dev/null
+++ b/test/wpt/tests/resources/test/tests/unit/IdlArray/is_json_type.html
@@ -0,0 +1,192 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+<title>IdlArray.prototype.is_json_type()</title>
+</head>
+<body>
+<div id="log"></div>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/WebIDLParser.js"></script>
+<script src="/resources/idlharness.js"></script>
+<script src="../../../idl-helper.js"></script>
+<script>
+    "use strict";
+
+    test(function() {
+        var idl = new IdlArray();
+        assert_true(idl.is_json_type(typeFrom("DOMString")));
+        assert_true(idl.is_json_type(typeFrom("ByteString")));
+        assert_true(idl.is_json_type(typeFrom("USVString")));
+        idl.add_untested_idls('enum BarEnum { "a", "b", "c" };');
+        assert_true(idl.is_json_type(typeFrom("BarEnum")));
+    }, 'should return true for all string types');
+
+    test(function() {
+        var idl = new IdlArray();
+        assert_false(idl.is_json_type(typeFrom("Error")));
+        assert_false(idl.is_json_type(typeFrom("DOMException")));
+    }, 'should return false for all exception types');
+
+    test(function() {
+        var idl = new IdlArray();
+        assert_false(idl.is_json_type(typeFrom("Int8Array")));
+        assert_false(idl.is_json_type(typeFrom("Int16Array")));
+        assert_false(idl.is_json_type(typeFrom("Int32Array")));
+        assert_false(idl.is_json_type(typeFrom("Uint8Array")));
+        assert_false(idl.is_json_type(typeFrom("Uint16Array")));
+        assert_false(idl.is_json_type(typeFrom("Uint32Array")));
+        assert_false(idl.is_json_type(typeFrom("Uint8ClampedArray")));
+        assert_false(idl.is_json_type(typeFrom("BigInt64Array")));
+        assert_false(idl.is_json_type(typeFrom("BigUint64Array")));
+        assert_false(idl.is_json_type(typeFrom("Float32Array")));
+        assert_false(idl.is_json_type(typeFrom("Float64Array")));
+        assert_false(idl.is_json_type(typeFrom("ArrayBuffer")));
+        assert_false(idl.is_json_type(typeFrom("DataView")));
+    }, 'should return false for all buffer source types');
+
+    test(function() {
+        var idl = new IdlArray();
+        assert_true(idl.is_json_type(typeFrom("boolean")));
+    }, 'should return true for boolean');
+
+    test(function() {
+        var idl = new IdlArray();
+        assert_true(idl.is_json_type(typeFrom("byte")));
+        assert_true(idl.is_json_type(typeFrom("octet")));
+        assert_true(idl.is_json_type(typeFrom("short")));
+        assert_true(idl.is_json_type(typeFrom("unsigned short")));
+        assert_true(idl.is_json_type(typeFrom("long")));
+        assert_true(idl.is_json_type(typeFrom("unsigned long")));
+        assert_true(idl.is_json_type(typeFrom("long long")));
+        assert_true(idl.is_json_type(typeFrom("unsigned long long")));
+        assert_true(idl.is_json_type(typeFrom("float")));
+        assert_true(idl.is_json_type(typeFrom("unrestricted float")));
+        assert_true(idl.is_json_type(typeFrom("double")));
+        assert_true(idl.is_json_type(typeFrom("unrestricted double")));
+    }, 'should return true for all numeric types');
+
+    test(function() {
+        var idl = new IdlArray();
+        assert_false(idl.is_json_type(typeFrom("Promise<DOMString>")));
+    }, 'should return false for promises');
+
+    test(function() {
+        var idl = new IdlArray();
+        assert_false(idl.is_json_type(typeFrom("sequence<DOMException>")));
+        assert_true(idl.is_json_type(typeFrom("sequence<DOMString>")));
+    }, 'should handle sequences according to their inner types');
+
+    test(function() {
+        var idl = new IdlArray();
+        assert_false(idl.is_json_type(typeFrom("FrozenArray<DOMException>")));
+        assert_true(idl.is_json_type(typeFrom("FrozenArray<DOMString>")));
+    }, 'should handle frozen arrays according to their inner types');
+
+    test(function() {
+        var idl = new IdlArray();
+        assert_true(idl.is_json_type(typeFrom("record<DOMString, DOMString>")));
+        assert_false(idl.is_json_type(typeFrom("record<DOMString, Error>")));
+    }, 'should handle records according to their inner types');
+
+    test(function() {
+        var idl = new IdlArray();
+        assert_true(idl.is_json_type(typeFrom("object")));
+    }, 'should return true for object type');
+
+    test(function() {
+        var idl = new IdlArray();
+        assert_false(idl.is_json_type(typeFrom("any")));
+    }, 'should return false for any type');
+
+    test(function() {
+        var idl = new IdlArray();
+        idl.add_untested_idls('dictionary Foo { DOMString foo; }; dictionary Bar : Foo { DOMString bar; };');
+        assert_true(idl.is_json_type(typeFrom("Foo")));
+        assert_true(idl.is_json_type(typeFrom("Bar")));
+    }, 'should return true for dictionaries whose members are all JSON types');
+
+    test(function() {
+        var idl = new IdlArray();
+        idl.add_untested_idls('dictionary Foo { };');
+        assert_true(idl.is_json_type(typeFrom("Foo")));
+    }, 'should return true for dictionaries which have no members');
+
+    test(function() {
+        var idl = new IdlArray();
+        idl.add_untested_idls('dictionary FooBar { DOMString a; Error b; }; dictionary Baz : FooBar {};');
+        assert_false(idl.is_json_type(typeFrom("FooBar")));
+        assert_false(idl.is_json_type(typeFrom("Baz")));
+    }, 'should return false for dictionaries whose members are not all JSON types');
+
+    test(function() {
+        var idl = new IdlArray();
+        idl.add_untested_idls('interface Foo { DOMString toJSON(); };');
+        assert_true(idl.is_json_type(typeFrom("Foo")));
+    }, 'should return true for interfaces which declare a toJSON operation');
+
+    test(function() {
+        var idl = new IdlArray();
+        idl.add_untested_idls('interface Foo { DOMString toJSON(); }; interface Bar : Foo { };');
+        assert_true(idl.is_json_type(typeFrom("Bar")));
+    }, 'should return true for interfaces which inherit from an interface which declares a toJSON operation');
+
+    test(function() {
+        var idl = new IdlArray();
+        idl.add_untested_idls('interface Foo { }; interface mixin Bar { DOMString toJSON(); }; Foo includes Bar;');
+        idl.merge_mixins();
+        assert_true(idl.is_json_type(typeFrom("Foo")));
+    }, 'should return true for interfaces which mixin an interface which declare a toJSON operation');
+
+    test(function() {
+        var idl = new IdlArray();
+        idl.add_untested_idls('interface Foo { };');
+        assert_false(idl.is_json_type(typeFrom("Foo")));
+    }, 'should return false for interfaces which do not declare a toJSON operation');
+
+    test(function() {
+        var idl = new IdlArray();
+        idl.add_untested_idls('interface Foo { object toJSON(); };');
+        assert_true(idl.is_json_type(typeFrom("(Foo or DOMString)")));
+    }, 'should return true for union types whose member types are JSON types');
+
+    test(function() {
+        var idl = new IdlArray();
+        assert_false(idl.is_json_type(typeFrom("(DataView or DOMString)")));
+    }, 'should return false for union types whose member types are not all JSON types');
+
+    test(function() {
+        var idl = new IdlArray();
+        assert_true(idl.is_json_type(typeFrom("DOMString?")));
+        assert_false(idl.is_json_type(typeFrom("DataView?")));
+    }, 'should consider the inner types of nullable types');
+
+    test(function() {
+        var idl = new IdlArray();
+        assert_true(idl.is_json_type(typeFrom("[XAttr] long")));
+        assert_false(idl.is_json_type(typeFrom("[XAttr] DataView")));
+    }, 'should consider the inner types of annotated types.');
+
+    test(function() {
+        var idl = new IdlArray();
+        assert_throws_js(Error, _ => idl.is_json_type(typeFrom("Foo")));
+    }, "should throw if it references a dictionary, enum or interface which wasn't added to the IdlArray");
+
+    test(function() {
+        var idl = new IdlArray();
+        idl.add_untested_idls('interface Foo : Bar { };');
+        assert_throws_js(Error, _ => idl.is_json_type(typeFrom("Foo")));
+    }, "should throw for interfaces which inherit from another interface which wasn't added to the IdlArray");
+
+    test(function() {
+        var idl = new IdlArray();
+        assert_true(idl.is_json_type(typedefFrom("typedef double DOMHighResTimeStamp;").idlType));
+    }, 'should return true for typedefs whose source type is a JSON type');
+
+    test(function() {
+        var idl = new IdlArray();
+        assert_false(idl.is_json_type(typedefFrom("typedef DataView DOMHighResTimeStamp;").idlType));
+    }, 'should return false for typedefs whose source type is not a JSON type');
+</script>
+</body>
+</html>
diff --git a/test/wpt/tests/resources/test/tests/unit/IdlDictionary/get_reverse_inheritance_stack.html b/test/wpt/tests/resources/test/tests/unit/IdlDictionary/get_reverse_inheritance_stack.html
new file mode 100644
index 00000000000..418bcdec92a
--- /dev/null
+++ b/test/wpt/tests/resources/test/tests/unit/IdlDictionary/get_reverse_inheritance_stack.html
@@ -0,0 +1,47 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+<title>IdlDictionary.prototype.get_reverse_inheritance_stack()</title>
+</head>
+<body>
+<div id="log"></div>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/WebIDLParser.js"></script>
+<script src="/resources/idlharness.js"></script>
+<script src="../../../idl-helper.js"></script>
+<script>
+    "use strict";
+    test(function() {
+        var stack = dictionaryFrom('dictionary A { };').get_reverse_inheritance_stack();
+        assert_array_equals(stack.map(d => d.name), ["A"]);
+    }, 'should return an array that includes itself.');
+
+    test(function() {
+        var d = dictionaryFrom('dictionary A : B { };');
+        assert_throws_js(Error, _ => d.get_reverse_inheritance_stack());
+    }, "should throw for dictionaries which inherit from another dictionary which wasn't added to the IdlArray");
+
+    test(function() {
+        var idl = new IdlArray();
+        idl.add_idls('dictionary A : B { };');
+        idl.add_untested_idls('dictionary B : C { }; dictionary C { };');
+        var A = idl.members["A"];
+        assert_array_equals(A.get_reverse_inheritance_stack().map(d => d.name), ["C", "B", "A"]);
+    }, 'should return an array of dictionaries in order of inheritance, starting with the base dictionary');
+
+    test(function () {
+      let i = new IdlArray();
+      i.add_untested_idls('dictionary A : B {};');
+      i.assert_throws(new IdlHarnessError('A inherits B, but B is undefined.'), i => i.test());
+    }, 'A : B with B undeclared should throw IdlHarnessError');
+
+    test(function () {
+      let i = new IdlArray();
+      i.add_untested_idls('dictionary A : B {};');
+      i.add_untested_idls('interface B {};');
+      i.assert_throws(new IdlHarnessError('A inherits B, but A is not an interface.'), i => i.test());
+    }, 'dictionary A : B with B interface should throw IdlHarnessError');
+</script>
+</body>
+</html>
diff --git a/test/wpt/tests/resources/test/tests/unit/IdlDictionary/test_partial_dictionary.html b/test/wpt/tests/resources/test/tests/unit/IdlDictionary/test_partial_dictionary.html
new file mode 100644
index 00000000000..d6137f6895f
--- /dev/null
+++ b/test/wpt/tests/resources/test/tests/unit/IdlDictionary/test_partial_dictionary.html
@@ -0,0 +1,39 @@
+<!DOCTYPE HTML>
+<html>
+
+<head>
+  <meta charset="utf-8">
+  <title>idlharness: partial dictionaries</title>
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  <script src="/resources/WebIDLParser.js"></script>
+  <script src="/resources/idlharness.js"></script>
+  <script src="../../../idl-helper.js"></script>
+</head>
+
+<body>
+<pre id='idl'>
+dictionary A {};
+partial dictionary A {
+  boolean B;
+};
+partial dictionary A {
+  boolean C;
+};
+</pre>
+
+<script>
+'use strict';
+
+test(() => {
+  let idlArray = new IdlArray();
+  idlArray.add_idls(document.getElementById('idl').textContent);
+  idlArray.test();
+
+  let members = idlArray.members["A"].members.map(m => m.name);
+  assert_array_equals(members, ["B", "C"], 'A should contain B, C');
+}, 'Partial dictionaries');
+</script>
+
+</body>
+</html>
diff --git a/test/wpt/tests/resources/test/tests/unit/IdlInterface/constructors.html b/test/wpt/tests/resources/test/tests/unit/IdlInterface/constructors.html
new file mode 100644
index 00000000000..e9ee3f8680a
--- /dev/null
+++ b/test/wpt/tests/resources/test/tests/unit/IdlInterface/constructors.html
@@ -0,0 +1,26 @@
+<!DOCTYPE HTML>
+<title>IdlInterface.prototype.constructors()</title>
+<div id="log"></div>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/WebIDLParser.js"></script>
+<script src="/resources/idlharness.js"></script>
+<script src="../../../idl-helper.js"></script>
+<script>
+"use strict";
+// [Constructor] extended attribute should not be supported:
+test(function() {
+    var i = interfaceFrom('[Constructor] interface A { };');
+    assert_equals(i.constructors().length, 0);
+}, 'Interface with Constructor extended attribute.');
+
+test(function() {
+    var i = interfaceFrom('interface A { constructor(); };');
+    assert_equals(i.constructors().length, 1);
+}, 'Interface with constructor method');
+
+test(function() {
+    var i = interfaceFrom('interface A { constructor(); constructor(any value); };');
+    assert_equals(i.constructors().length, 2);
+}, 'Interface with constructor overloads');
+</script>
diff --git a/test/wpt/tests/resources/test/tests/unit/IdlInterface/default_to_json_operation.html b/test/wpt/tests/resources/test/tests/unit/IdlInterface/default_to_json_operation.html
new file mode 100644
index 00000000000..5ade7d0d282
--- /dev/null
+++ b/test/wpt/tests/resources/test/tests/unit/IdlInterface/default_to_json_operation.html
@@ -0,0 +1,114 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+<title>IdlDictionary.prototype.default_to_json_operation()</title>
+</head>
+<body>
+<div id="log"></div>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/WebIDLParser.js"></script>
+<script src="/resources/idlharness.js"></script>
+<script src="../../../idl-helper.js"></script>
+<script>
+    "use strict";
+    test(function() {
+        var map = interfaceFrom('interface A { [Default] object toJSON(); };').default_to_json_operation();
+        assert_equals(map.size, 0);
+    }, 'should return an empty map when there are no attributes');
+
+    test(function() {
+        var r = interfaceFrom('interface A { };').default_to_json_operation();
+        assert_equals(r, null);
+    }, 'should return null when there is no toJSON method');
+
+    test(function() {
+        var r = interfaceFrom('interface A { DOMString toJSON(); };').default_to_json_operation();
+        assert_equals(r, null);
+    }, 'should return null when there is a toJSON method but it does not have the [Default] extended attribute');
+
+    test(function() {
+        var context = new IdlArray();
+        context.add_idls("interface A : B { DOMString toJSON(); };");
+        context.add_idls("interface B { [Default] object toJSON(); };");
+        var r = context.members.A.default_to_json_operation();
+        assert_equals(r, null);
+    }, 'should return null when there is a toJSON method but it does not have the [Default] extended attribute even if this extended attribute exists on inherited interfaces');
+
+    test(function() {
+        var map = interfaceFrom('interface A { [Default] object toJSON(); static attribute DOMString foo; };').default_to_json_operation();
+        assert_equals(map.size, 0);
+    }, 'should not include static attributes');
+
+    test(function() {
+        var map = interfaceFrom('interface A { [Default] object toJSON(); attribute Promise<DOMString> bar; };').default_to_json_operation();
+        assert_equals(map.size, 0);
+    }, 'should not include attributes which are not JSON types');
+
+    test(function() {
+        var map = interfaceFrom('interface A { [Default] object toJSON(); DOMString bar(); };').default_to_json_operation();
+        assert_equals(map.size, 0);
+    }, 'should not include operations');
+
+    test(function() {
+        var map = interfaceFrom('interface A { [Default] object toJSON(); attribute DOMString bar; };').default_to_json_operation();
+        assert_equals(map.size, 1);
+        assert_true(map.has("bar"));
+        assert_equals(map.get("bar").idlType, "DOMString");
+    }, 'should return a map whose key/value pair represent the identifier and IDL type of valid attributes');
+
+    test(function() {
+        var context = new IdlArray();
+        context.add_idls("interface A : B { [Default] object toJSON(); attribute DOMString a; };");
+        context.add_idls("interface B { [Default] object toJSON(); attribute long b; };");
+        var map = context.members.A.default_to_json_operation();
+        assert_array_equals([...map.keys()], ["b", "a"]);
+        assert_array_equals([...map.values()].map(v => v.idlType), ["long", "DOMString"]);
+    }, 'should return a properly ordered map that contains IDL types of valid attributes for inherited interfaces');
+
+    test(function() {
+        var context = new IdlArray();
+        context.add_idls("interface A : B { attribute DOMString a; };");
+        context.add_idls("interface B { [Default] object toJSON(); attribute long b; };");
+        var map = context.members.A.default_to_json_operation();
+        assert_equals(map.size, 1);
+        assert_true(map.has("b"));
+        assert_equals(map.get("b").idlType, "long");
+        assert_array_equals([...map.keys()], ["b"]);
+    }, 'should not include attributes of the current interface when the [Default] toJSON method in inherited');
+
+    test(function() {
+        var context = new IdlArray();
+        context.add_idls("interface A : B { [Default] object toJSON(); };");
+        context.add_idls("interface B : C { [Default] object toJSON(); attribute DOMString foo; };");
+        context.add_idls("interface C { [Default] object toJSON(); attribute long foo; };");
+        var map = context.members.A.default_to_json_operation();
+        assert_equals(map.size, 1);
+        assert_true(map.has("foo"));
+        assert_equals(map.get("foo").idlType, "DOMString");
+    }, 'attributes declared further away in the inheritance hierarchy should be masked by attributes declared closer');
+
+    test(function() {
+        var context = new IdlArray();
+        context.add_idls("interface A { [Default] object toJSON(); attribute DOMString a; };");
+        context.add_idls("interface B : A { attribute any b; };");
+        context.add_idls("interface C : B { [Default] object toJSON(); attribute long c; };");
+        var map = context.members.C.default_to_json_operation();
+        assert_array_equals([...map.keys()], ["a", "c"]);
+        assert_array_equals([...map.values()].map(v => v.idlType), ["DOMString", "long"]);
+    }, 'should return an ordered map that ignores attributes of inherited interfaces which do not declare a [Default] toJSON operation.');
+
+    test(function() {
+        var context = new IdlArray();
+        context.add_idls("interface D { attribute DOMString d; };");
+        context.add_idls("interface mixin M { [Default] object toJSON(); attribute long m; };");
+        context.add_idls("D includes M;");
+        context.merge_mixins();
+        var map = context.members.D.default_to_json_operation();
+        assert_array_equals([...map.keys()], ["d", "m"]);
+        assert_array_equals([...map.values()].map(v => v.idlType), ["DOMString", "long"]);
+    }, 'should return a properly ordered map that accounts for mixed-in interfaces which declare a [Default] toJSON operation.');
+</script>
+</body>
+</html>
+
diff --git a/test/wpt/tests/resources/test/tests/unit/IdlInterface/do_member_unscopable_asserts.html b/test/wpt/tests/resources/test/tests/unit/IdlInterface/do_member_unscopable_asserts.html
new file mode 100644
index 00000000000..90142efe6b6
--- /dev/null
+++ b/test/wpt/tests/resources/test/tests/unit/IdlInterface/do_member_unscopable_asserts.html
@@ -0,0 +1,56 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+<title>IdlDictionary.prototype.do_member_unscopable_asserts()</title>
+</head>
+<body>
+<div id="log"></div>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/WebIDLParser.js"></script>
+<script src="/resources/idlharness.js"></script>
+<script src="../../../idl-helper.js"></script>
+<script>
+    'use strict';
+    function mock_interface_A(unscopables) {
+        self.A = function A() {};
+        A.prototype[Symbol.unscopables] = unscopables;
+    }
+
+    test(function() {
+        const i = interfaceFrom('interface A { [Unscopable] attribute any x; };');
+        const member = i.members[0];
+        assert_true(member.isUnscopable);
+        mock_interface_A({ x: true });
+        i.do_member_unscopable_asserts(member);
+    }, 'should not throw for [Unscopable] with property in @@unscopables');
+
+    test(function() {
+        const i = interfaceFrom('interface A { [Unscopable] attribute any x; };');
+        const member = i.members[0];
+        assert_true(member.isUnscopable);
+        mock_interface_A({});
+        // assert_throws_* can't be used because they rethrow AssertionErrors.
+        try {
+            i.do_member_unscopable_asserts(member);
+        } catch(e) {
+            assert_true(e.message.includes('Symbol.unscopables'));
+            return;
+        }
+        assert_unreached('did not throw');
+    }, 'should throw for [Unscopable] with property missing from @@unscopables');
+
+    // This test checks that for attributes/methods which aren't [Unscopable]
+    // in the IDL, we don't assert that @@unscopables is missing the property.
+    // This could miss implementation bugs, but [Unscopable] is so rarely used
+    // that it's fairly unlikely to ever happen.
+    test(function() {
+        const i = interfaceFrom('interface A { attribute any x; };');
+        const member = i.members[0];
+        assert_false(member.isUnscopable);
+        mock_interface_A({ x: true });
+        i.do_member_unscopable_asserts(member);
+    }, 'should not throw if [Unscopable] is used but property is in @@unscopables');
+</script>
+</body>
+</html>
diff --git a/test/wpt/tests/resources/test/tests/unit/IdlInterface/get_interface_object.html b/test/wpt/tests/resources/test/tests/unit/IdlInterface/get_interface_object.html
new file mode 100644
index 00000000000..a3d901a752d
--- /dev/null
+++ b/test/wpt/tests/resources/test/tests/unit/IdlInterface/get_interface_object.html
@@ -0,0 +1,22 @@
+<!DOCTYPE HTML>
+<title>IdlInterface.prototype.get_interface_object()</title>
+<div id="log"></div>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/WebIDLParser.js"></script>
+<script src="/resources/idlharness.js"></script>
+<script src="../../../idl-helper.js"></script>
+<script>
+"use strict";
+test(function() {
+    window.A = {};
+    var i = interfaceFrom('interface A { };');
+    assert_equals(i.get_interface_object(), window.A);
+}, 'Interface does not have LegacyNamespace.');
+
+test(function() {
+    window.Foo = { A: {} };
+    var i = interfaceFrom('[LegacyNamespace=Foo] interface A { }; namespace Foo { };');
+    assert_equals(i.get_interface_object(), window.Foo.A);
+}, 'Interface has LegacyNamespace');
+</script>
diff --git a/test/wpt/tests/resources/test/tests/unit/IdlInterface/get_interface_object_owner.html b/test/wpt/tests/resources/test/tests/unit/IdlInterface/get_interface_object_owner.html
new file mode 100644
index 00000000000..51ab2067bc5
--- /dev/null
+++ b/test/wpt/tests/resources/test/tests/unit/IdlInterface/get_interface_object_owner.html
@@ -0,0 +1,21 @@
+<!DOCTYPE HTML>
+<title>IdlInterface.prototype.get_interface_object_owner()</title>
+<div id="log"></div>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/WebIDLParser.js"></script>
+<script src="/resources/idlharness.js"></script>
+<script src="../../../idl-helper.js"></script>
+<script>
+"use strict";
+test(function() {
+    var i = interfaceFrom('interface A { };');
+    assert_equals(i.get_interface_object_owner(), window);
+}, 'Interface does not have LegacyNamespace.');
+
+test(function() {
+    window.Foo = {};
+    var i = interfaceFrom('[LegacyNamespace=Foo] interface A { }; namespace Foo { };');
+    assert_equals(i.get_interface_object_owner(), window.Foo);
+}, 'Interface has LegacyNamespace');
+</script>
diff --git a/test/wpt/tests/resources/test/tests/unit/IdlInterface/get_legacy_namespace.html b/test/wpt/tests/resources/test/tests/unit/IdlInterface/get_legacy_namespace.html
new file mode 100644
index 00000000000..e2d42bb09e3
--- /dev/null
+++ b/test/wpt/tests/resources/test/tests/unit/IdlInterface/get_legacy_namespace.html
@@ -0,0 +1,20 @@
+<!DOCTYPE HTML>
+<title>IdlInterface.prototype.get_legacy_namespace()</title>
+<div id="log"></div>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/WebIDLParser.js"></script>
+<script src="/resources/idlharness.js"></script>
+<script src="../../../idl-helper.js"></script>
+<script>
+"use strict";
+test(function() {
+    var i = interfaceFrom('interface A { };');
+    assert_equals(i.get_legacy_namespace(), undefined);
+}, 'Interface does not have LegacyNamespace.');
+
+test(function() {
+    var i = interfaceFrom('[LegacyNamespace=Foo] interface A { }; namespace Foo { };');
+    assert_equals(i.get_legacy_namespace(), "Foo");
+}, 'Interface has LegacyNamespace');
+</script>
diff --git a/test/wpt/tests/resources/test/tests/unit/IdlInterface/get_qualified_name.html b/test/wpt/tests/resources/test/tests/unit/IdlInterface/get_qualified_name.html
new file mode 100644
index 00000000000..677a31b5e70
--- /dev/null
+++ b/test/wpt/tests/resources/test/tests/unit/IdlInterface/get_qualified_name.html
@@ -0,0 +1,20 @@
+<!DOCTYPE HTML>
+<title>IdlInterface.prototype.get_qualified_name()</title>
+<div id="log"></div>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/WebIDLParser.js"></script>
+<script src="/resources/idlharness.js"></script>
+<script src="../../../idl-helper.js"></script>
+<script>
+"use strict";
+test(function() {
+    var i = interfaceFrom('interface A { };');
+    assert_equals(i.get_qualified_name(), "A");
+}, 'Interface does not have LegacyNamespace.');
+
+test(function() {
+    var i = interfaceFrom('[LegacyNamespace=Foo] interface A { }; namespace Foo { };');
+    assert_equals(i.get_qualified_name(), "Foo.A");
+}, 'Interface has LegacyNamespace');
+</script>
diff --git a/test/wpt/tests/resources/test/tests/unit/IdlInterface/get_reverse_inheritance_stack.html b/test/wpt/tests/resources/test/tests/unit/IdlInterface/get_reverse_inheritance_stack.html
new file mode 100644
index 00000000000..0c066baabbc
--- /dev/null
+++ b/test/wpt/tests/resources/test/tests/unit/IdlInterface/get_reverse_inheritance_stack.html
@@ -0,0 +1,49 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+<title>IdlInterface.prototype.get_reverse_inheritance_stack()</title>
+</head>
+<body>
+<div id="log"></div>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/WebIDLParser.js"></script>
+<script src="/resources/idlharness.js"></script>
+<script src="../../../idl-helper.js"></script>
+<script>
+    "use strict";
+    test(function() {
+        var stack = interfaceFrom('interface A { };').get_reverse_inheritance_stack();
+        assert_array_equals(stack.map(i => i.name), ["A"]);
+    }, 'should return an array that includes itself.');
+
+    test(function() {
+        var i = interfaceFrom('interface A : B { };');
+        assert_throws_js(Error, _ => i.get_reverse_inheritance_stack());
+    }, "should throw for interfaces which inherit from another interface which wasn't added to the IdlArray");
+
+    test(function() {
+        var idl = new IdlArray();
+        idl.add_idls('interface A : B { };');
+        idl.add_untested_idls('interface B : C { }; interface C { };');
+        var A = idl.members["A"];
+        assert_array_equals(A.get_reverse_inheritance_stack().map(i => i.name), ["C", "B", "A"]);
+    }, 'should return an array of interfaces in order of inheritance, starting with the base interface');
+
+    test(function () {
+        var idl = new IdlArray();
+        idl.add_untested_idls('interface A : B { };');
+        idl.add_untested_idls('interface B : A { };');
+        idl.assert_throws('A has a circular dependency: A,B,A', i => i.test());
+    }, 'should throw when inheritance is circular');
+
+    test(function () {
+        var idl = new IdlArray();
+        idl.add_untested_idls('interface A : B { };');
+        idl.assert_throws(
+            'Duplicate identifier A',
+            i => i.add_untested_idls('interface A : C { };'));
+    }, 'should throw when multiple inheritances defined');
+</script>
+</body>
+</html>
diff --git a/test/wpt/tests/resources/test/tests/unit/IdlInterface/has_default_to_json_regular_operation.html b/test/wpt/tests/resources/test/tests/unit/IdlInterface/has_default_to_json_regular_operation.html
new file mode 100644
index 00000000000..b47262b72b9
--- /dev/null
+++ b/test/wpt/tests/resources/test/tests/unit/IdlInterface/has_default_to_json_regular_operation.html
@@ -0,0 +1,47 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+<title>IdlInterface.prototype.has_default_to_json_regular_operation()</title>
+</head>
+<body>
+<div id="log"></div>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/WebIDLParser.js"></script>
+<script src="/resources/idlharness.js"></script>
+<script src="../../../idl-helper.js"></script>
+<script>
+    "use strict";
+    test(function() {
+        var i = interfaceFrom('interface A { };');
+        assert_false(i.has_default_to_json_regular_operation());
+    }, 'should return false when the interface declares no toJSON operation.');
+
+    test(function() {
+        var i = interfaceFrom('interface A { static object toJSON(); };');
+        assert_false(i.has_default_to_json_regular_operation());
+    }, 'should return false when the interface declares a static toJSON operation.');
+
+    test(function() {
+        var i = interfaceFrom('interface A { object toJSON(); };');
+        assert_false(i.has_default_to_json_regular_operation());
+    }, 'should return false when the interface declares a regular toJSON operation with no extended attribute.');
+
+    test(function() {
+        var i = interfaceFrom('interface A { [x] object toJSON(); };');
+        assert_false(i.has_default_to_json_regular_operation());
+    }, 'should return false when the interface declares a regular toJSON operation with another extented attribute.');
+
+    test(function() {
+        var i = interfaceFrom('interface A { [Default] object toJSON(); };');
+        assert_true(i.has_default_to_json_regular_operation());
+    }, 'should return true when the interface declares a regular toJSON operation with the [Default] extented attribute.');
+
+    test(function() {
+        var i = interfaceFrom('interface A { [Attr, AnotherAttr, Default] object toJSON(); };');
+        assert_true(i.has_default_to_json_regular_operation());
+    }, 'should return true when the interface declares a regular toJSON operation with multiple extended attributes, including [Default].');
+</script>
+</body>
+</html>
+
diff --git a/test/wpt/tests/resources/test/tests/unit/IdlInterface/has_to_json_regular_operation.html b/test/wpt/tests/resources/test/tests/unit/IdlInterface/has_to_json_regular_operation.html
new file mode 100644
index 00000000000..a1a641bd971
--- /dev/null
+++ b/test/wpt/tests/resources/test/tests/unit/IdlInterface/has_to_json_regular_operation.html
@@ -0,0 +1,31 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+<title>IdlInterface.prototype.has_to_json_regular_operation()</title>
+</head>
+<body>
+<div id="log"></div>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/WebIDLParser.js"></script>
+<script src="/resources/idlharness.js"></script>
+<script src="../../../idl-helper.js"></script>
+<script>
+    "use strict";
+    test(function() {
+        var i = interfaceFrom('interface A { };');
+        assert_false(i.has_to_json_regular_operation());
+    }, 'should return false when the interface declares no toJSON operation.');
+
+    test(function() {
+        var i = interfaceFrom('interface A { static object toJSON(); };');
+        assert_false(i.has_to_json_regular_operation());
+    }, 'should return false when the interface declares a static toJSON operation.');
+
+    test(function() {
+        var i = interfaceFrom('interface A { object toJSON(); };');
+        assert_true(i.has_to_json_regular_operation());
+    }, 'should return true when the interface declares a regular toJSON operation.');
+</script>
+</body>
+</html>
diff --git a/test/wpt/tests/resources/test/tests/unit/IdlInterface/should_have_interface_object.html b/test/wpt/tests/resources/test/tests/unit/IdlInterface/should_have_interface_object.html
new file mode 100644
index 00000000000..3ce945751d8
--- /dev/null
+++ b/test/wpt/tests/resources/test/tests/unit/IdlInterface/should_have_interface_object.html
@@ -0,0 +1,30 @@
+<!DOCTYPE HTML>
+<title>IdlInterface.prototype.should_have_interface_object()</title>
+<div id="log"></div>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/WebIDLParser.js"></script>
+<script src="/resources/idlharness.js"></script>
+<script src="../../../idl-helper.js"></script>
+<script>
+"use strict";
+test(function() {
+    var i = interfaceFrom("callback interface A { const unsigned short B = 0; };");
+    assert_true(i.should_have_interface_object());
+}, "callback interface with a constant");
+
+test(function() {
+    var i = interfaceFrom("callback interface A { undefined b(); sequence<any> c(); };");
+    assert_false(i.should_have_interface_object());
+}, "callback interface without a constant");
+
+test(function() {
+    var i = interfaceFrom("[LegacyNoInterfaceObject] interface A { };");
+    assert_false(i.should_have_interface_object());
+}, "non-callback interface with [LegacyNoInterfaceObject]");
+
+test(function() {
+    var i = interfaceFrom("interface A { };");
+    assert_true(i.should_have_interface_object());
+}, "non-callback interface without [LegacyNoInterfaceObject]");
+</script>
diff --git a/test/wpt/tests/resources/test/tests/unit/IdlInterface/test_primary_interface_of_undefined.html b/test/wpt/tests/resources/test/tests/unit/IdlInterface/test_primary_interface_of_undefined.html
new file mode 100644
index 00000000000..0031558ad42
--- /dev/null
+++ b/test/wpt/tests/resources/test/tests/unit/IdlInterface/test_primary_interface_of_undefined.html
@@ -0,0 +1,29 @@
+<!DOCTYPE HTML>
+<html>
+
+<head>
+  <title>idlharness test_primary_interface_of_undefined</title>
+</head>
+
+<body>
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/WebIDLParser.js"></script>
+  <script src="/resources/idlharness.js"></script>
+  <script>
+    'use strict';
+    test(function () {
+      let i = new IdlArray();
+      i.add_untested_idls('interface A : B {};');
+      i.assert_throws(new IdlHarnessError('A inherits B, but B is undefined.'), i => i.test());
+    }, 'A : B with B undeclared should throw IdlHarnessError');
+
+    test(function () {
+      let i = new IdlArray();
+      i.add_untested_idls('interface A : B {};');
+      i.add_untested_idls('dictionary B {};');
+      i.assert_throws(new IdlHarnessError('A inherits B, but B is not an interface.'), i => i.test());
+    }, 'interface A : B with B dictionary should throw IdlHarnessError');
+  </script>
+</body>
+
+</html>
diff --git a/test/wpt/tests/resources/test/tests/unit/IdlInterfaceMember/is_to_json_regular_operation.html b/test/wpt/tests/resources/test/tests/unit/IdlInterfaceMember/is_to_json_regular_operation.html
new file mode 100644
index 00000000000..b3f402dd088
--- /dev/null
+++ b/test/wpt/tests/resources/test/tests/unit/IdlInterfaceMember/is_to_json_regular_operation.html
@@ -0,0 +1,42 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+<title>IdlInterfaceMember.prototype.is_to_json_regular_operation()</title>
+</head>
+<body>
+<div id="log"></div>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/WebIDLParser.js"></script>
+<script src="/resources/idlharness.js"></script>
+<script src="../../../idl-helper.js"></script>
+<script>
+    "use strict";
+    test(function() {
+        var m = memberFrom("readonly attribute DOMString foo");
+        assert_false(m.is_to_json_regular_operation());
+    }, 'should return false when member is an attribute.');
+
+    test(function() {
+        var m = memberFrom("static undefined foo()");
+        assert_false(m.is_to_json_regular_operation());
+    }, 'should return false when member is a static operation.');
+
+    test(function() {
+        var m = memberFrom("static object toJSON()");
+        assert_false(m.is_to_json_regular_operation());
+    }, 'should return false when member is a static toJSON operation.');
+
+    test(function() {
+        var m = memberFrom("object toJSON()");
+        assert_true(m.is_to_json_regular_operation());
+    }, 'should return true when member is a regular toJSON operation.');
+
+    test(function() {
+        var m = memberFrom("[Foo] object toJSON()");
+        assert_true(m.is_to_json_regular_operation());
+    }, 'should return true when member is a regular toJSON operation with extensible attributes.');
+</script>
+</body>
+</html>
+
diff --git a/test/wpt/tests/resources/test/tests/unit/IdlInterfaceMember/toString.html b/test/wpt/tests/resources/test/tests/unit/IdlInterfaceMember/toString.html
new file mode 100644
index 00000000000..054dbb1ccbd
--- /dev/null
+++ b/test/wpt/tests/resources/test/tests/unit/IdlInterfaceMember/toString.html
@@ -0,0 +1,36 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+<title>IdlInterfaceMember.prototype.toString()</title>
+</head>
+<body>
+<div id="log"></div>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/WebIDLParser.js"></script>
+<script src="/resources/idlharness.js"></script>
+<script src="../../../idl-helper.js"></script>
+<script>
+"use strict";
+const tests = [
+    ["long x", "long"],
+    ["long? x", "long?"],
+    ["Promise<long> x", "Promise<long>"],
+    ["Promise<long?> x", "Promise<long?>"],
+    ["sequence<long> x", "sequence<long>"],
+    ["(long or DOMString) x", "(long or DOMString)"],
+    ["long x, boolean y", "long, boolean"],
+    ["long x, optional boolean y", "long, optional boolean"],
+    ["long... args", "long..."],
+    ["sequence<long>... args", "sequence<long>..."],
+    ["(long or DOMString)... args", "(long or DOMString)..."],
+];
+for (const [input, output] of tests) {
+    test(function() {
+        var m = memberFrom(`undefined foo(${input})`);
+        assert_equals(m.toString(), `foo(${output})`);
+    }, `toString for ${input}`);
+}
+</script>
+</body>
+</html>
diff --git a/test/wpt/tests/resources/test/tests/unit/assert_implements.html b/test/wpt/tests/resources/test/tests/unit/assert_implements.html
new file mode 100644
index 00000000000..6e35f385027
--- /dev/null
+++ b/test/wpt/tests/resources/test/tests/unit/assert_implements.html
@@ -0,0 +1,43 @@
+<!DOCTYPE HTML>
+<html lang="en">
+<meta charset="utf-8">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/test/tests/unit/helpers.js"></script>
+<title>assert_implements unittests</title>
+<script>
+'use strict';
+
+test(() => {
+  // All values in JS that are not falsy are truthy, so we just check some
+  // common cases here.
+  assert_implements(true, 'true is a truthy value');
+  assert_implements(5, 'positive integeter is a truthy value');
+  assert_implements(-5, 'negative integeter is a truthy value');
+  assert_implements('foo', 'non-empty string is a truthy value');
+}, 'truthy values');
+
+test_failure(() => {
+  assert_implements(false);
+}, 'false is a falsy value');
+
+test_failure(() => {
+  assert_implements(0);
+}, '0 is a falsy value');
+
+test_failure(() => {
+  assert_implements('');
+}, 'empty string is a falsy value');
+
+test_failure(() => {
+  assert_implements(null);
+}, 'null is a falsy value');
+
+test_failure(() => {
+  assert_implements(undefined);
+}, 'undefined is a falsy value');
+
+test_failure(() => {
+  assert_implements(NaN);
+}, 'NaN is a falsy value');
+</script>
diff --git a/test/wpt/tests/resources/test/tests/unit/assert_implements_optional.html b/test/wpt/tests/resources/test/tests/unit/assert_implements_optional.html
new file mode 100644
index 00000000000..4f23e203c57
--- /dev/null
+++ b/test/wpt/tests/resources/test/tests/unit/assert_implements_optional.html
@@ -0,0 +1,43 @@
+<!DOCTYPE HTML>
+<html lang="en">
+<meta charset="utf-8">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/test/tests/unit/helpers.js"></script>
+<title>assert_implements_optional unittests</title>
+<script>
+'use strict';
+
+test(() => {
+  // All values in JS that are not falsy are truthy, so we just check some
+  // common cases here.
+  assert_implements_optional(true, 'true is a truthy value');
+  assert_implements_optional(5, 'positive integeter is a truthy value');
+  assert_implements_optional(-5, 'negative integeter is a truthy value');
+  assert_implements_optional('foo', 'non-empty string is a truthy value');
+}, 'truthy values');
+
+test_failure(() => {
+  assert_implements_optional(false);
+}, 'false is a falsy value');
+
+test_failure(() => {
+  assert_implements_optional(0);
+}, '0 is a falsy value');
+
+test_failure(() => {
+  assert_implements_optional('');
+}, 'empty string is a falsy value');
+
+test_failure(() => {
+  assert_implements_optional(null);
+}, 'null is a falsy value');
+
+test_failure(() => {
+  assert_implements_optional(undefined);
+}, 'undefined is a falsy value');
+
+test_failure(() => {
+  assert_implements_optional(NaN);
+}, 'NaN is a falsy value');
+</script>
diff --git a/test/wpt/tests/resources/test/tests/unit/assert_object_equals.html b/test/wpt/tests/resources/test/tests/unit/assert_object_equals.html
new file mode 100644
index 00000000000..313d77b9771
--- /dev/null
+++ b/test/wpt/tests/resources/test/tests/unit/assert_object_equals.html
@@ -0,0 +1,152 @@
+<!DOCTYPE HTML>
+<html lang="en">
+<meta charset="utf-8">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/test/tests/unit/helpers.js"></script>
+<title>Assertion functions</title>
+<script>
+'use strict';
+
+test(function() {
+  assert_object_equals({}, {});
+}, 'empty objects');
+
+test(function() {
+  var actual = {};
+  var expected = {};
+  actual.a = actual;
+  expected.a = actual;
+
+  assert_object_equals(actual, expected);
+}, 'tolerates cycles in actual value');
+
+test(function() {
+  var actual = {};
+  var expected = {};
+  actual.a = expected;
+  expected.a = expected;
+
+  assert_object_equals(actual, expected);
+}, 'tolerates cycles in expected value');
+
+test(function() {
+  assert_object_equals({2: 99, 0: 23, 1: 45}, [23, 45, 99]);
+}, 'recognizes equivalence of actual object and expected array');
+
+test(function() {
+  assert_object_equals([23, 45, 99], {2: 99, 0: 23, 1: 45});
+}, 'recognizes equivalence of actual array and expected object');
+
+test(function() {
+  var actual = {};
+  var expected = {};
+  Object.defineProperty(actual, 'a', { value: 1, enumerable: false });
+
+  assert_not_equals(actual.a, expected.a);
+  assert_object_equals(actual, expected);
+}, 'non-enumerable properties in actual value ignored');
+
+test(function() {
+  var actual = {};
+  var expected = {};
+  Object.defineProperty(expected, 'a', { value: 1, enumerable: false });
+
+  assert_not_equals(actual.a, expected.a);
+  assert_object_equals(actual, expected);
+}, 'non-enumerable properties in expected value ignored');
+
+test(function() {
+  assert_object_equals({c: 3, a: 1, b: 2}, {a: 1, b: 2, c: 3});
+}, 'equivalent objects - "flat" object');
+
+test(function() {
+  assert_object_equals(
+    {c: {e: 5, d: 4}, b: 2, a: 1},
+    {a: 1, b: 2, c: {d: 4, e: 5}}
+  );
+}, 'equivalent objects - nested object');
+
+test(function() {
+  assert_object_equals(
+    {c: [4, 5], b: 2, a: 1},
+    {a: 1, b: 2, c: [4, 5]}
+  );
+}, 'equivalent objects - nested array');
+
+test(function() {
+  assert_object_equals({a: NaN}, {a: NaN});
+}, 'equivalent objects - NaN value');
+
+test(function() {
+  assert_object_equals({a: -0}, {a: -0});
+}, 'equivalent objects - negative zero value');
+
+test_failure(function() {
+  assert_object_equals(undefined, {});
+}, 'invalid actual value: undefined');
+
+test_failure(function() {
+  assert_object_equals(null, {});
+}, 'invalid actual value: null');
+
+test_failure(function() {
+  assert_object_equals(34, {});
+}, 'invalid actual value: number');
+
+test_failure(function() {
+  assert_object_equals({c: 3, a: 1, b: 2}, {a: 1, b: 1, c: 3});
+}, 'unequal property value - "flat" object');
+
+test_failure(function() {
+  var actual = Object.create({a: undefined});
+  var expected = {};
+
+  assert_object_equals(actual, expected);
+}, 'non-own properties in actual value verified');
+
+test_failure(function() {
+  var actual = {};
+  var expected = Object.create({a: undefined});
+
+  assert_object_equals(actual, expected);
+}, 'non-own properties in expected value verified');
+
+test_failure(function() {
+  assert_object_equals(
+    {a: 1, b: 2, c: {d: 5, e: 5, f: 6}},
+    {a: 1, b: 2, c: {d: 5, e: 7, f: 6}}
+  );
+}, 'unequal property value - nested object');
+
+test_failure(function() {
+  assert_object_equals(
+    {a: 1, b: 2, c: [4, 5, 6]},
+    {a: 1, b: 2, c: [4, 7, 6]}
+  );
+}, 'unequal property value - nested array');
+
+test_failure(function() {
+  assert_object_equals({a: NaN}, {a: 0});
+}, 'equivalent objects - NaN actual value');
+
+test_failure(function() {
+  assert_object_equals({a: 0}, {a: NaN});
+}, 'equivalent objects - NaN expected value');
+
+test_failure(function() {
+  assert_object_equals({a: -0}, {a: 0});
+}, 'equivalent objects - negative zero actual value');
+
+test_failure(function() {
+  assert_object_equals({a: 0}, {a: -0});
+}, 'equivalent objects - negative zero expected value');
+
+test_failure(function() {
+  assert_object_equals({a: 1}, {});
+}, 'actual contains additional property');
+
+test_failure(function() {
+  assert_object_equals({}, {a: 1});
+}, 'expected contains additional property');
+</script>
diff --git a/test/wpt/tests/resources/test/tests/unit/async-test-return-restrictions.html b/test/wpt/tests/resources/test/tests/unit/async-test-return-restrictions.html
new file mode 100644
index 00000000000..0fde2e24223
--- /dev/null
+++ b/test/wpt/tests/resources/test/tests/unit/async-test-return-restrictions.html
@@ -0,0 +1,135 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <meta charset="utf-8">
+  <script src="/resources/testharness.js"></script>
+  <title>Restrictions on return value from `async_test`</title>
+</head>
+<body>
+<script>
+function makeTest(...bodies) {
+  const closeScript = '<' + '/script>';
+  let src = `
+<!DOCTYPE HTML>
+<html>
+<head>
+<title>Document title</title>
+<script src="/resources/testharness.js?${Math.random()}">${closeScript}
+</head>
+
+<body>
+<div id="log"></div>`;
+  bodies.forEach((body) => {
+    src += '<script>(' + body + ')();' + closeScript;
+  });
+
+  const iframe = document.createElement('iframe');
+
+  document.body.appendChild(iframe);
+  iframe.contentDocument.write(src);
+
+  return new Promise((resolve) => {
+    window.addEventListener('message', function onMessage(e) {
+      if (e.source !== iframe.contentWindow) {
+        return;
+      }
+      if (!e.data || e.data.type !=='complete') {
+        return;
+      }
+      window.removeEventListener('message', onMessage);
+      resolve(e.data);
+    });
+
+    iframe.contentDocument.close();
+  }).then(({ tests, status }) => {
+    const summary = {
+      harness: {
+        status: getEnumProp(status, status.status),
+        message: status.message
+      },
+      tests: {}
+    };
+
+    tests.forEach((test) => {
+      summary.tests[test.name] = getEnumProp(test, test.status);
+    });
+
+    return summary;
+  });
+}
+
+function getEnumProp(object, value) {
+  for (let property in object) {
+    if (!/^[A-Z]+$/.test(property)) {
+      continue;
+    }
+
+    if (object[property] === value) {
+      return property;
+    }
+  }
+}
+
+promise_test(() => {
+  return makeTest(
+      () => {
+        async_test((t) => {t.done(); return undefined;}, 'before');
+        async_test((t) => {t.done(); return null;}, 'null');
+        async_test((t) => {t.done(); return undefined;}, 'after');
+      }
+    ).then(({harness, tests}) => {
+      assert_equals(harness.status, 'ERROR');
+      assert_equals(
+        harness.message,
+        'Test named "null" passed a function to `async_test` that returned a value.'
+      );
+      assert_equals(tests.before, 'PASS');
+      assert_equals(tests.null, 'PASS');
+      // This test did not get the chance to start.
+      assert_equals(tests.after, undefined);
+    });
+}, 'test returning `null`');
+
+promise_test(() => {
+  return makeTest(
+      () => {
+        async_test((t) => {t.done(); return undefined;}, 'before');
+        async_test((t) => {t.done(); return {};}, 'object');
+        async_test((t) => {t.done(); return undefined;}, 'after');
+      }
+    ).then(({harness, tests}) => {
+      assert_equals(harness.status, 'ERROR');
+      assert_equals(
+        harness.message,
+        'Test named "object" passed a function to `async_test` that returned a value.'
+      );
+      assert_equals(tests.before, 'PASS');
+      assert_equals(tests.object, 'PASS');
+      // This test did not get the chance to start.
+      assert_equals(tests.after, undefined);
+    });
+}, 'test returning an ordinary object');
+
+promise_test(() => {
+  return makeTest(
+      () => {
+        async_test((t) => {t.done(); return undefined;}, 'before');
+        async_test((t) => {t.done(); return Promise.resolve(5);}, 'thenable');
+        async_test((t) => {t.done(); return undefined;}, 'after');
+      }
+    ).then(({harness, tests}) => {
+      assert_equals(harness.status, 'ERROR');
+      assert_equals(
+        harness.message,
+        'Test named "thenable" passed a function to `async_test` that returned a value. ' +
+        'Consider using `promise_test` instead when using Promises or async/await.'
+      );
+      assert_equals(tests.before, 'PASS');
+      assert_equals(tests.thenable, 'PASS');
+      // This test did not get a chance to start.
+      assert_equals(tests.after, undefined);
+    });
+}, 'test returning a thenable object');
+</script>
+</body>
+</html>
diff --git a/test/wpt/tests/resources/test/tests/unit/basic.html b/test/wpt/tests/resources/test/tests/unit/basic.html
new file mode 100644
index 00000000000..d52082f2e07
--- /dev/null
+++ b/test/wpt/tests/resources/test/tests/unit/basic.html
@@ -0,0 +1,48 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+<title>idlharness basic</title>
+</head>
+<body>
+<div id="log"></div>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/WebIDLParser.js"></script>
+<script src="/resources/idlharness.js"></script>
+<script>
+    "use strict";
+    test(function() {
+        assert_true("IdlArray" in window);
+    }, 'IdlArray constructor should be a global object');
+    test(function() {
+        assert_true(new IdlArray() instanceof IdlArray);
+    }, 'IdlArray constructor should be constructible');
+    test(function() {
+        assert_true("WebIDL2" in window);
+    }, 'WebIDL2 namespace should be a global object');
+    test(function() {
+        assert_equals(typeof WebIDL2.parse, "function");
+    }, 'WebIDL2 namespace should have a parse method');
+    test(function() {
+        try {
+            WebIDL2.parse("I'm a syntax error");
+            throw new Error("Web IDL didn't throw");
+        } catch (e) {
+            assert_equals(e.name, "WebIDLParseError");
+        }
+    }, 'WebIDL2 parse method should bail on incorrect WebIDL');
+    test(function() {
+        assert_equals(typeof WebIDL2.parse("interface Foo {};"), "object");
+    }, 'WebIDL2 parse method should produce an AST for correct WebIDL');
+    test(function () {
+        try {
+            let i = new IdlArray();
+            i.add_untested_idls(`interface C {};`);
+            i.assert_throws('Anything', i => i.test());
+        } catch (e) {
+            assert_true(e instanceof IdlHarnessError);
+        }
+    }, `assert_throws should throw if no IdlHarnessError thrown`);
+</script>
+</body>
+</html>
diff --git a/test/wpt/tests/resources/test/tests/unit/exceptional-cases-timeouts.html b/test/wpt/tests/resources/test/tests/unit/exceptional-cases-timeouts.html
new file mode 100644
index 00000000000..760ac7154f1
--- /dev/null
+++ b/test/wpt/tests/resources/test/tests/unit/exceptional-cases-timeouts.html
@@ -0,0 +1,120 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <meta charset="utf-8">
+  <meta name="timeout" content="long">
+  <script src="/resources/testharness.js"></script>
+  <title>Exceptional cases - timeouts</title>
+</head>
+<body>
+<p>
+  The tests in this file are executed in parallel to avoid exceeding the "long"
+  timeout duration.
+</p>
+<script>
+function makeTest(...bodies) {
+  const closeScript = '<' + '/script>';
+  let src = `
+<!DOCTYPE HTML>
+<html>
+<head>
+<title>Document title</title>
+<script src="/resources/testharness.js?${Math.random()}">${closeScript}
+</head>
+
+<body>
+<div id="log"></div>`;
+  bodies.forEach((body) => {
+    src += '<script>(' + body + ')();' + closeScript;
+  });
+
+  const iframe = document.createElement('iframe');
+
+  document.body.appendChild(iframe);
+  iframe.contentDocument.write(src);
+
+  return new Promise((resolve) => {
+    window.addEventListener('message', function onMessage(e) {
+      if (e.source !== iframe.contentWindow) {
+        return;
+      }
+      if (!e.data || e.data.type !=='complete') {
+        return;
+      }
+      window.removeEventListener('message', onMessage);
+      resolve(e.data);
+    });
+
+    iframe.contentDocument.close();
+  }).then(({ tests, status }) => {
+    const summary = {
+      harness: getEnumProp(status, status.status),
+      tests: {}
+    };
+
+    tests.forEach((test) => {
+      summary.tests[test.name] = getEnumProp(test, test.status);
+    });
+
+    return summary;
+  });
+}
+
+function getEnumProp(object, value) {
+  for (let property in object) {
+    if (!/^[A-Z]+$/.test(property)) {
+      continue;
+    }
+
+    if (object[property] === value) {
+      return property;
+    }
+  }
+}
+
+(() => {
+  window.asyncTestCleanupCount1 = 0;
+  const nestedTest = makeTest(
+    () => {
+      async_test((t) => {
+        t.add_cleanup(() => window.parent.asyncTestCleanupCount1 += 1);
+        setTimeout(() => {
+          throw new Error('this error is expected');
+        });
+      }, 'test');
+    }
+  );
+  promise_test(() => {
+    return nestedTest.then(({harness, tests}) => {
+        assert_equals(harness, 'ERROR');
+        assert_equals(tests.test, 'TIMEOUT');
+        assert_equals(window.asyncTestCleanupCount1, 1);
+      });
+  }, 'uncaught exception during async_test which times out');
+})();
+
+(() => {
+  window.promiseTestCleanupCount2 = 0;
+  const nestedTest = makeTest(
+    () => {
+      promise_test((t) => {
+        t.add_cleanup(() => window.parent.promiseTestCleanupCount2 += 1);
+        setTimeout(() => {
+          throw new Error('this error is expected');
+        });
+
+        return new Promise(() => {});
+      }, 'test');
+    }
+  );
+  promise_test(() => {
+    return nestedTest.then(({harness, tests}) => {
+        assert_equals(harness, 'ERROR');
+        assert_equals(tests.test, 'TIMEOUT');
+        assert_equals(window.promiseTestCleanupCount2, 1);
+      });
+  }, 'uncaught exception during promise_test which times out');
+})();
+</script>
+</body>
+</html>
diff --git a/test/wpt/tests/resources/test/tests/unit/exceptional-cases.html b/test/wpt/tests/resources/test/tests/unit/exceptional-cases.html
new file mode 100644
index 00000000000..4054d0311d2
--- /dev/null
+++ b/test/wpt/tests/resources/test/tests/unit/exceptional-cases.html
@@ -0,0 +1,392 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <meta charset="utf-8">
+  <meta name="timeout" content="long">
+  <script src="/resources/testharness.js"></script>
+  <title>Exceptional cases</title>
+</head>
+<body>
+<script>
+function makeTest(...bodies) {
+  const closeScript = '<' + '/script>';
+  let src = `
+<!DOCTYPE HTML>
+<html>
+<head>
+<title>Document title</title>
+<script src="/resources/testharness.js?${Math.random()}">${closeScript}
+</head>
+
+<body>
+<div id="log"></div>`;
+  bodies.forEach((body) => {
+    src += '<script>(' + body + ')();' + closeScript;
+  });
+
+  const iframe = document.createElement('iframe');
+
+  document.body.appendChild(iframe);
+  iframe.contentDocument.write(src);
+
+  return new Promise((resolve) => {
+    window.addEventListener('message', function onMessage(e) {
+      if (e.source !== iframe.contentWindow) {
+        return;
+      }
+      if (!e.data || e.data.type !=='complete') {
+        return;
+      }
+      window.removeEventListener('message', onMessage);
+      resolve(e.data);
+    });
+
+    iframe.contentDocument.close();
+  }).then(({ tests, status }) => {
+    const summary = {
+      harness: getEnumProp(status, status.status),
+      tests: {}
+    };
+
+    tests.forEach((test) => {
+      summary.tests[test.name] = getEnumProp(test, test.status);
+    });
+
+    return summary;
+  });
+}
+
+function getEnumProp(object, value) {
+  for (let property in object) {
+    if (!/^[A-Z]+$/.test(property)) {
+      continue;
+    }
+
+    if (object[property] === value) {
+      return property;
+    }
+  }
+}
+
+promise_test(() => {
+  return makeTest(
+      () => { done(); }
+    ).then(({harness, tests}) => {
+      assert_equals(harness, 'ERROR');
+      assert_array_equals(Object.keys(tests), []);
+    });
+}, 'completion signaled before testing begins');
+
+promise_test(() => {
+  return makeTest(
+      () => { assert_true(true); done(); }
+    ).then(({harness, tests}) => {
+      assert_equals(harness, 'ERROR');
+      assert_array_equals(Object.keys(tests), []);
+    });
+}, 'passing assertion before testing begins');
+
+promise_test(() => {
+  return makeTest(
+      () => { assert_false(true); }
+    ).then(({harness, tests}) => {
+      assert_equals(harness, 'ERROR');
+      assert_array_equals(Object.keys(tests), []);
+    });
+}, 'failing assertion before testing begins');
+
+promise_test(() => {
+  return makeTest(
+      () => { throw new Error('this error is expected'); }
+    ).then(({harness, tests}) => {
+      assert_equals(harness, 'ERROR');
+      assert_array_equals(Object.keys(tests), []);
+    });
+}, 'uncaught exception before testing begins');
+
+promise_test(() => {
+  return makeTest(
+      () => {
+        setup({ allow_uncaught_exception: true });
+        throw new Error('this error is expected');
+      },
+      () => {
+        test(function() {}, 'a');
+        test(function() {}, 'b');
+      }
+    ).then(({harness, tests}) => {
+      assert_equals(harness, 'OK');
+      assert_equals(tests.a, 'PASS');
+      assert_equals(tests.b, 'PASS');
+    });
+}, 'uncaught exception with subsequent subtest');
+
+promise_test(() => {
+  return makeTest(
+      () => {
+        async_test((t) => {
+          setTimeout(() => {
+            setTimeout(() => t.done(), 0);
+            async_test((t) => { setTimeout(t.done.bind(t), 0); }, 'after');
+            throw new Error('this error is expected');
+          }, 0);
+        }, 'during');
+      }
+    ).then(({harness, tests}) => {
+      assert_equals(harness, 'ERROR');
+      assert_equals(tests.during, 'PASS');
+      assert_equals(tests.after, 'PASS');
+    });
+}, 'uncaught exception during async_test');
+
+promise_test(() => {
+  return makeTest(
+      () => {
+        promise_test(() => {
+          return new Promise((resolve) => {
+            setTimeout(() => {
+              resolve();
+              promise_test(() => Promise.resolve(), 'after');
+              throw new Error('this error is expected');
+            }, 0);
+          });
+        }, 'during');
+      }
+    ).then(({harness, tests}) => {
+      assert_equals(harness, 'ERROR');
+      assert_equals(tests.during, 'PASS');
+      assert_equals(tests.after, 'PASS');
+    });
+}, 'uncaught exception during promise_test');
+
+promise_test(() => {
+  return makeTest(
+      () => { test(() => {}, 'before'); },
+      () => { throw new Error('this error is expected'); },
+      () => { test(() => {}, 'after'); }
+    ).then(({harness, tests}) => {
+      assert_equals(harness, 'ERROR');
+      assert_equals(tests.before, 'PASS');
+      assert_equals(tests.after, 'PASS');
+    });
+}, 'uncaught exception between tests');
+
+promise_test(() => {
+  return makeTest(
+      () => { promise_test(() => Promise.resolve(), 'before'); },
+      () => { throw new Error('this error is expected'); },
+      () => { promise_test(() => Promise.resolve(), 'after'); }
+    ).then(({harness, tests}) => {
+      assert_equals(harness, 'ERROR');
+      assert_equals(tests.before, 'PASS');
+      assert_equals(tests.after, 'PASS');
+    });
+}, 'uncaught exception between promise_tests');
+
+
+// This feature of testharness.js is only observable in browsers which
+// implement the `unhandledrejection` event.
+if ('onunhandledrejection' in window) {
+
+  promise_test(() => {
+    return makeTest(
+        () => { Promise.reject(new Error('this error is expected')); }
+      ).then(({harness, tests}) => {
+        assert_equals(harness, 'ERROR');
+        assert_array_equals(Object.keys(tests), []);
+      });
+  }, 'unhandled rejection before testing begins');
+
+  promise_test(() => {
+    return makeTest(
+        () => {
+          async_test((t) => {
+            Promise.reject(new Error('this error is expected'));
+
+            window.addEventListener('unhandledrejection', () => {
+            setTimeout(() => t.done(), 0);
+              async_test((t) => { setTimeout(t.done.bind(t), 0); }, 'after');
+              t.done();
+            });
+          }, 'during');
+        }
+      ).then(({harness, tests}) => {
+        assert_equals(harness, 'ERROR');
+        assert_equals(tests.during, 'PASS');
+        assert_equals(tests.after, 'PASS');
+      });
+  }, 'unhandled rejection during async_test');
+
+  promise_test(() => {
+    return makeTest(
+        () => {
+          promise_test(() => {
+            return new Promise((resolve) => {
+              Promise.reject(new Error('this error is expected'));
+
+              window.addEventListener('unhandledrejection', () => {
+                resolve();
+                promise_test(() => Promise.resolve(), 'after');
+                throw new Error('this error is expected');
+              }, 0);
+            });
+          }, 'during');
+        }
+      ).then(({harness, tests}) => {
+        assert_equals(harness, 'ERROR');
+        assert_equals(tests.during, 'PASS');
+        assert_equals(tests.after, 'PASS');
+      });
+  }, 'unhandled rejection during promise_test');
+
+  promise_test(() => {
+    return makeTest(
+        () => {
+          setup({ explicit_done: true });
+          test(() => {}, 'before');
+          Promise.reject(new Error('this error is expected'));
+          window.addEventListener('unhandledrejection', () => {
+            test(() => {}, 'after');
+            done();
+          });
+        }
+      ).then(({harness, tests}) => {
+        assert_equals(harness, 'ERROR');
+        assert_equals(tests.before, 'PASS');
+        assert_true('after' in tests);
+      });
+  }, 'unhandled rejection between tests');
+
+  promise_test(() => {
+    return makeTest(
+        () => {
+          setup({ explicit_done: true });
+          async_test((t) => { setTimeout(t.done.bind(t), 0); }, 'before');
+          Promise.reject(new Error('this error is expected'));
+          window.addEventListener('unhandledrejection', () => {
+            async_test((t) => { setTimeout(t.done.bind(t), 0); }, 'after');
+            done();
+          });
+        }
+      ).then(({harness, tests}) => {
+        assert_equals(harness, 'ERROR');
+        assert_equals(tests.before, 'PASS');
+        assert_equals(tests.after, 'PASS');
+      });
+  }, 'unhandled rejection between async_tests');
+
+  promise_test(() => {
+    return makeTest(
+        () => {
+          setup({ explicit_done: true });
+          promise_test(() => Promise.resolve(), 'before');
+          Promise.reject(new Error('this error is expected'));
+          window.addEventListener('unhandledrejection', () => {
+            promise_test(() => Promise.resolve(), 'after');
+            done();
+          });
+        }
+      ).then(({harness, tests}) => {
+        assert_equals(harness, 'ERROR');
+        assert_equals(tests.before, 'PASS');
+        assert_true('after' in tests);
+      });
+  }, 'unhandled rejection between promise_tests');
+
+  promise_test(() => {
+    return makeTest(
+        () => {
+          test((t) => {
+            t.add_cleanup(() => { throw new Error('this error is expected'); });
+          }, 'during');
+          test((t) => {}, 'after');
+        }
+      ).then(({harness, tests}) => {
+        assert_equals(harness, 'ERROR');
+        assert_equals(tests.during, 'PASS');
+        assert_equals(tests.after, 'NOTRUN');
+      });
+  }, 'exception in `add_cleanup` of a test');
+
+}
+
+
+promise_test(() => {
+  return makeTest(
+      () => {
+        setup({explicit_done: true});
+        window.addEventListener('DOMContentLoaded', () => {
+          async_test((t) => {
+            t.add_cleanup(() => {
+              setTimeout(() => {
+                async_test((t) => t.done(), 'after');
+                done();
+              }, 0);
+              throw new Error('this error is expected');
+            });
+            setTimeout(t.done.bind(t), 0);
+          }, 'during');
+        });
+      }
+    ).then(({harness, tests}) => {
+      assert_equals(harness, 'ERROR');
+      assert_equals(tests.during, 'PASS');
+      assert_equals(tests.after, 'NOTRUN');
+    });
+}, 'exception in `add_cleanup` of an async_test');
+
+promise_test(() => {
+  return makeTest(
+      () => {
+        promise_test((t) => {
+          t.add_cleanup(() => { throw new Error('this error is expected'); });
+          return Promise.resolve();
+        }, 'test');
+      }
+    ).then(({harness, tests}) => {
+      assert_equals(harness, 'ERROR');
+      assert_equals(tests.test, 'PASS');
+    });
+}, 'exception in `add_cleanup` of a promise_test');
+
+promise_test(() => {
+  return makeTest(
+      () => {
+        promise_test((t) => {
+          t.step(() => {
+            throw new Error('this error is expected');
+          });
+        }, 'test');
+        async_test((t) => t.done(), 'after');
+      }
+    ).then(({harness, tests}) => {
+      assert_equals(harness, 'OK');
+      assert_equals(tests.test, 'FAIL');
+      assert_equals(tests.after, 'PASS');
+    });
+}, 'exception in `step` of an async_test');
+
+promise_test(() => {
+  return makeTest(
+      () => {
+        promise_test((t) => {
+          t.step(() => {
+            throw new Error('this error is expected');
+          });
+
+          return new Promise(() => {});
+        }, 'test');
+
+        // This following test should be run to completion despite the fact
+        // that the promise returned by the previous test never resolves.
+        promise_test((t) => Promise.resolve(), 'after');
+      }
+    ).then(({harness, tests}) => {
+      assert_equals(harness, 'OK');
+      assert_equals(tests.test, 'FAIL');
+      assert_equals(tests.after, 'PASS');
+    });
+}, 'exception in `step` of a promise_test');
+</script>
+</body>
+</html>
diff --git a/test/wpt/tests/resources/test/tests/unit/format-value.html b/test/wpt/tests/resources/test/tests/unit/format-value.html
new file mode 100644
index 00000000000..13d01b81f35
--- /dev/null
+++ b/test/wpt/tests/resources/test/tests/unit/format-value.html
@@ -0,0 +1,123 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>format_value utility function</title>
+  <meta charset="utf-8">
+</head>
+<body>
+<div id="log"></div>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script>
+"use strict";
+
+test(function() {
+  assert_equals(format_value(null), "null");
+}, "null");
+
+test(function() {
+  assert_equals(format_value(undefined), "undefined");
+}, "undefined");
+
+test(function() {
+  assert_equals(format_value(true), "true");
+  assert_equals(format_value(false), "false");
+}, "boolean values");
+
+test(function() {
+  assert_equals(format_value(0.4), "0.4");
+  assert_equals(format_value(0), "0");
+  assert_equals(format_value(-0), "-0");
+}, "number values");
+
+test(function() {
+  assert_equals(format_value("a string"), "\"a string\"");
+  assert_equals(format_value("new\nline"), "\"new\\nline\"");
+}, "string values");
+
+test(function() {
+  var node = document.createElement("span");
+  node.setAttribute("data-foo", "bar");
+  assert_true(
+    /<span\b/i.test(format_value(node)), "element includes tag name"
+  );
+  assert_true(
+    /data-foo=["']?bar["']?/i.test(format_value(node)),
+    "element includes attributes"
+  );
+}, "node value: element node");
+
+test(function() {
+  var text = document.createTextNode("wpt");
+  assert_equals(format_value(text), "Text node \"wpt\"");
+}, "node value: text node");
+
+test(function() {
+  var node = document.createProcessingInstruction("wpt1", "wpt2");
+  assert_equals(
+    format_value(node),
+    "ProcessingInstruction node with target \"wpt1\" and data \"wpt2\""
+  );
+}, "node value: ProcessingInstruction node");
+
+test(function() {
+  var node = document.createComment("wpt");
+  assert_equals(format_value(node), "Comment node <!--wpt-->");
+}, "node value: comment node");
+
+test(function() {
+  var node = document.implementation.createDocument(
+    "application/xhtml+xml", "", null
+  );
+
+  assert_equals(format_value(node), "Document node with 0 children");
+
+  node.appendChild(document.createElement('html'));
+
+  assert_equals(format_value(node), "Document node with 1 child");
+}, "node value: document node");
+
+test(function() {
+  var node = document.implementation.createDocumentType("foo", "baz", "baz");
+
+  assert_equals(format_value(node), "DocumentType node");
+}, "node value: DocumentType node");
+
+test(function() {
+  var node = document.createDocumentFragment();
+
+  assert_equals(format_value(node), "DocumentFragment node with 0 children");
+
+  node.appendChild(document.createElement("span"));
+
+  assert_equals(format_value(node), "DocumentFragment node with 1 child");
+
+  node.appendChild(document.createElement("span"));
+
+  assert_equals(format_value(node), "DocumentFragment node with 2 children");
+}, "node value: DocumentFragment node");
+
+test(function() {
+  assert_equals(format_value(Symbol("wpt")), "symbol \"Symbol(wpt)\"");
+}, "symbol value");
+
+test(function() {
+ assert_equals(format_value([]), "[]");
+ assert_equals(format_value(["one"]), "[\"one\"]");
+ assert_equals(format_value(["one", "two"]), "[\"one\", \"two\"]");
+}, "array values");
+
+test(function() {
+  var obj = {
+    toString: function() {
+      throw "wpt";
+    }
+  };
+
+  assert_equals(
+    format_value(obj), "[stringifying object threw wpt with type string]"
+  );
+}, "object value with faulty `toString`");
+</script>
+</body>
+</html>
diff --git a/test/wpt/tests/resources/test/tests/unit/helpers.js b/test/wpt/tests/resources/test/tests/unit/helpers.js
new file mode 100644
index 00000000000..ca378a27c91
--- /dev/null
+++ b/test/wpt/tests/resources/test/tests/unit/helpers.js
@@ -0,0 +1,21 @@
+// Helper for testing assertion failure cases for a testharness.js API
+//
+// The `assert_throws_*` functions cannot be used for this purpose because they
+// always fail in response to AssertionError exceptions, even when this is
+// expressed as the expected error.
+function test_failure(fn, name) {
+  test(function() {
+    try {
+      fn();
+    } catch (err) {
+      if (err instanceof AssertionError) {
+        return;
+      }
+      throw new AssertionError('Expected an AssertionError, but' + err);
+    }
+    throw new AssertionError(
+      'Expected an AssertionError, but no error was thrown'
+    );
+  }, name);
+}
+
diff --git a/test/wpt/tests/resources/test/tests/unit/late-test.html b/test/wpt/tests/resources/test/tests/unit/late-test.html
new file mode 100644
index 00000000000..693d7e3c818
--- /dev/null
+++ b/test/wpt/tests/resources/test/tests/unit/late-test.html
@@ -0,0 +1,54 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+<title>Test declared after harness completion</title>
+</head>
+<body>
+<div id="log"></div>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<p>This test simulates an automated test running scenario, where the test
+results emitted by testharness.js may be interpreted after some delay. It is
+intended to demonstrate that in such cases, any additional tests which are
+executed during that delay are <em>not</em> included in the dataset.</p>
+
+<p>Although these "late" tests are likely an indication of a mistake in test
+design, they cannot be detected deterministically, so in the interest of
+stability, they should be silently tolerated.</p>
+<script>
+async_test(function(t) {
+    var source = [
+        "<div id='log'></div>",
+        "<script src='/resources/testharness.js'></" + "script>",
+        "<script src='/resources/testharnessreport.js'></" + "script>",
+        "<script>",
+        "parent.childReady(window);",
+        "setup({ explicit_done: true });",
+        "test(function() {}, 'acceptable test');",
+        "onload = function() {",
+        "  done();",
+        "  test(function() {}, 'this test is late and should be ignored');",
+        "};",
+        "</" + "script>"
+    ].join("\n");
+    var iframe = document.createElement("iframe");
+
+    document.body.appendChild(iframe);
+    window.childReady = t.step_func(function(childWindow) {
+        childWindow.add_completion_callback(t.step_func(function(tests, status) {
+            t.step_timeout(t.step_func(function() {
+                assert_equals(tests.length, 1);
+                assert_equals(tests[0].name, "acceptable test");
+                assert_equals(status.status, status.OK);
+                t.done();
+            }), 0);
+        }));
+    });
+
+    iframe.contentDocument.open();
+    iframe.contentDocument.write(source);
+    iframe.contentDocument.close();
+});
+</script>
+</body>
+</html>
diff --git a/test/wpt/tests/resources/test/tests/unit/promise_setup-timeout.html b/test/wpt/tests/resources/test/tests/unit/promise_setup-timeout.html
new file mode 100644
index 00000000000..c4947feef42
--- /dev/null
+++ b/test/wpt/tests/resources/test/tests/unit/promise_setup-timeout.html
@@ -0,0 +1,28 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <meta charset="utf-8">
+  <meta name="timeout" content="long">
+  <script src="/resources/testharness.js"></script>
+  <script src="../../nested-testharness.js"></script>
+  <title>promise_setup - timeout</title>
+</head>
+<body>
+<script>
+'use strict';
+promise_test(() => {
+  return makeTest(
+      () => {
+        test(() => {}, 'before');
+        promise_setup(() => new Promise(() => {}));
+        promise_test(() => Promise.resolve(), 'after');
+      }
+    ).then(({harness, tests}) => {
+      assert_equals(harness, 'TIMEOUT');
+      assert_equals(tests.before, 'PASS');
+      assert_equals(tests.after, 'NOTRUN');
+    });
+}, 'timeout when returned promise does not settle');
+</script>
+</body>
+</html>
diff --git a/test/wpt/tests/resources/test/tests/unit/promise_setup.html b/test/wpt/tests/resources/test/tests/unit/promise_setup.html
new file mode 100644
index 00000000000..2abb10a476e
--- /dev/null
+++ b/test/wpt/tests/resources/test/tests/unit/promise_setup.html
@@ -0,0 +1,333 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <meta charset="utf-8">
+  <script src="/resources/testharness.js"></script>
+  <script src="../../nested-testharness.js"></script>
+  <title>promise_setup</title>
+</head>
+<body>
+<script>
+'use strict';
+promise_test(() => {
+  return makeTest(
+      () => {
+        // Ensure that the harness error is the result of explicit error
+        // handling
+        setup({ allow_uncaught_exception: true });
+
+        test(() => {}, 'before');
+        promise_setup({});
+        promise_test(() => Promise.resolve(), 'after');
+      }
+    ).then(({harness, tests}) => {
+      assert_equals(harness, 'ERROR');
+      assert_equals(tests.before, 'PASS');
+      assert_equals(tests.after, undefined);
+    });
+}, 'Error when no function provided');
+
+promise_test(() => {
+  return makeTest(
+      () => {
+        test(() => {}, 'before');
+        promise_setup(() => Promise.resolve(), {});
+        promise_test(() => Promise.resolve(), 'after');
+        throw new Error('this error is expected');
+      }
+    ).then(({harness, tests}) => {
+      assert_equals(harness, 'ERROR');
+      assert_equals(tests.before, 'PASS');
+      assert_equals(tests.after, 'PASS');
+    });
+}, 'Does not apply unspecified configuration properties');
+
+promise_test(() => {
+  return makeTest(
+      () => {
+        var properties = {
+          allow_uncaught_exception: true
+        };
+        test(() => {}, 'before');
+        promise_setup(() => Promise.resolve(), properties);
+        promise_test(() => Promise.resolve(), 'after');
+        throw new Error('this error is expected');
+      }
+    ).then(({harness, tests}) => {
+      assert_equals(harness, 'ERROR');
+      assert_equals(tests.before, 'PASS');
+      assert_equals(tests.after, 'PASS');
+    });
+}, 'Ignores configuration properties when some tests have already run');
+
+promise_test(() => {
+  return makeTest(
+      () => {
+        var properties = {
+          allow_uncaught_exception: true
+        };
+        promise_setup(() => Promise.resolve(), properties);
+        promise_test(() => {
+          return new Promise((resolve) => {
+            setTimeout(() => {
+              resolve();
+              throw new Error('this error is expected');
+            });
+          });
+        }, 'after');
+      }
+    ).then(({harness, tests}) => {
+      assert_equals(harness, 'OK');
+      assert_equals(tests.after, 'PASS');
+    });
+}, 'Honors configuration properties');
+
+promise_test(() => {
+  return makeTest(
+      () => {
+        // Ensure that the harness error is the result of explicit error
+        // handling
+        setup({ allow_uncaught_exception: true });
+
+        test(() => {}, 'before');
+        promise_setup(() => { throw new Error('this error is expected'); });
+        promise_test(() => Promise.resolve(), 'after');
+      }
+    ).then(({harness, tests}) => {
+      assert_equals(harness, 'ERROR');
+      assert_equals(tests.before, 'PASS');
+      assert_equals(tests.after, 'NOTRUN');
+    });
+}, 'Error for synchronous exceptions');
+
+promise_test(() => {
+  return makeTest(
+      () => {
+        // Ensure that the harness error is the result of explicit error
+        // handling
+        setup({ allow_uncaught_exception: true });
+
+        test(() => {}, 'before');
+        promise_setup(() => undefined);
+        promise_test(() => Promise.resolve(), 'after');
+      }
+    ).then(({harness, tests}) => {
+      assert_equals(harness, 'ERROR');
+      assert_equals(tests.before, 'PASS');
+      assert_equals(tests.after, 'NOTRUN');
+    });
+}, 'Error for missing return value');
+
+promise_test(() => {
+  return makeTest(
+      () => {
+        // Ensure that the harness error is the result of explicit error
+        // handling
+        setup({ allow_uncaught_exception: true });
+
+        test(() => {}, 'before');
+        var noThen = Promise.resolve();
+        noThen.then = undefined;
+        promise_setup(() => noThen);
+        promise_test(() => Promise.resolve(), 'after');
+      }
+    ).then(({harness, tests}) => {
+      assert_equals(harness, 'ERROR');
+      assert_equals(tests.before, 'PASS');
+      assert_equals(tests.after, 'NOTRUN');
+    });
+}, 'Error for non-thenable return value');
+
+promise_test(() => {
+  return makeTest(
+      () => {
+        // Ensure that the harness error is the result of explicit error
+        // handling
+        setup({ allow_uncaught_exception: true });
+
+        test(() => {}, 'before');
+        var poisonedThen = {
+          get then() {
+            throw new Error('this error is expected');
+          }
+        };
+        promise_setup(() => poisonedThen);
+        promise_test(() => Promise.resolve(), 'after');
+      }
+    ).then(({harness, tests}) => {
+      assert_equals(harness, 'ERROR');
+      assert_equals(tests.before, 'PASS');
+      assert_equals(tests.after, 'NOTRUN');
+    });
+}, 'Error for "poisoned" `then` property');
+
+promise_test(() => {
+  return makeTest(
+      () => {
+        // Ensure that the harness error is the result of explicit error
+        // handling
+        setup({ allow_uncaught_exception: true });
+
+        test(() => {}, 'before');
+        var badThen = {
+          then() {
+            throw new Error('this error is expected');
+          }
+        };
+        promise_setup(() => badThen);
+        promise_test(() => Promise.resolve(), 'after');
+      }
+    ).then(({harness, tests}) => {
+      assert_equals(harness, 'ERROR');
+      assert_equals(tests.before, 'PASS');
+      assert_equals(tests.after, 'NOTRUN');
+    });
+}, 'Error for synchronous error from `then` method');
+
+promise_test(() => {
+  return makeTest(
+      () => {
+        // Ensure that the harness error is the result of explicit error
+        // handling
+        setup({ allow_uncaught_exception: true });
+
+        test(() => {}, 'before');
+        promise_setup(() => Promise.resolve());
+        test(() => {}, 'after');
+      }
+    ).then(({harness, tests}) => {
+      assert_equals(harness, 'ERROR');
+      assert_equals(tests.before, 'PASS');
+      assert_equals(tests.after, undefined);
+    });
+}, 'Error for subsequent invocation of `test`');
+
+promise_test(() => {
+  return makeTest(
+      () => {
+        // Ensure that the harness error is the result of explicit error
+        // handling
+        setup({ allow_uncaught_exception: true });
+
+        test(() => {}, 'before');
+        promise_setup(() => Promise.resolve());
+        async_test((t) => t.done(), 'after');
+      }
+    ).then(({harness, tests}) => {
+      assert_equals(harness, 'ERROR');
+      assert_equals(tests.before, 'PASS');
+      assert_equals(tests.after, undefined);
+    });
+}, 'Error for subsequent invocation of `async_test`');
+
+promise_test(() => {
+  return makeTest(
+      () => {
+        // Ensure that the harness error is the result of explicit error
+        // handling
+        setup({ allow_uncaught_exception: true });
+
+        test(() => {}, 'before');
+        promise_setup(() => Promise.reject());
+        promise_test(() => Promise.resolve(), 'after');
+      }
+    ).then(({harness, tests}) => {
+      assert_equals(harness, 'ERROR');
+      assert_equals(tests.before, 'PASS');
+      assert_equals(tests.after, 'NOTRUN');
+    });
+}, 'Error for rejected promise');
+
+promise_test(() => {
+  var expected_sequence = [
+    'test body',
+    'promise_setup begin',
+    'promise_setup end',
+    'promise_test body'
+  ];
+  var actual_sequence = window.actual_sequence = [];
+
+  return makeTest(
+      () => {
+        test(() => { parent.actual_sequence.push('test body'); }, 'before');
+        promise_setup(() => {
+          parent.actual_sequence.push('promise_setup begin');
+
+          return Promise.resolve()
+            .then(() => new Promise((resolve) => setTimeout(resolve, 300)))
+            .then(() => parent.actual_sequence.push('promise_setup end'));
+        });
+        promise_test(() => {
+          parent.actual_sequence.push('promise_test body');
+          return Promise.resolve();
+        }, 'after');
+      }
+    ).then(({harness, tests}) => {
+      assert_equals(harness, 'OK');
+      assert_equals(tests.before, 'PASS');
+      assert_equals(tests.after, 'PASS');
+      assert_array_equals(actual_sequence, expected_sequence);
+    });
+}, 'Waits for promise to settle');
+
+promise_test(() => {
+  var expected_sequence = [
+    'promise_test 1 begin',
+    'promise_test 1 end',
+    'promise_setup begin',
+    'promise_setup end',
+    'promise_test 2 body'
+  ];
+  var actual_sequence = window.actual_sequence = [];
+
+  return makeTest(
+      () => {
+        promise_test((t) => {
+          parent.actual_sequence.push('promise_test 1 begin');
+
+          return Promise.resolve()
+            .then(() => new Promise((resolve) => t.step_timeout(resolve, 300)))
+            .then(() => parent.actual_sequence.push('promise_test 1 end'));
+        }, 'before');
+        promise_setup(() => {
+          parent.actual_sequence.push('promise_setup begin');
+
+          return Promise.resolve()
+            .then(() => new Promise((resolve) => setTimeout(resolve, 300)))
+            .then(() => parent.actual_sequence.push('promise_setup end'));
+        });
+        promise_test(() => {
+          parent.actual_sequence.push('promise_test 2 body');
+          return Promise.resolve();
+        }, 'after');
+      }
+    ).then(({harness, tests}) => {
+      assert_equals(harness, 'OK');
+      assert_equals(tests.before, 'PASS');
+      assert_equals(tests.after, 'PASS');
+      assert_array_equals(actual_sequence, expected_sequence);
+    });
+}, 'Waits for existing promise_test to complete');
+
+promise_test(() => {
+  return makeTest(
+      () => {
+        var properties = { allow_uncaught_exception: true };
+        promise_test(() => {
+          return new Promise((resolve) => {
+            setTimeout(() => {
+              resolve();
+              throw new Error('this error is expected');
+            });
+          });
+        }, 'before');
+        promise_setup(() => Promise.resolve(), properties);
+      }
+    ).then(({harness, tests}) => {
+      assert_equals(harness, 'ERROR');
+      assert_equals(tests.before, 'PASS');
+    });
+}, 'Defers application of setup properties');
+</script>
+</body>
+</html>
diff --git a/test/wpt/tests/resources/test/tests/unit/single_test.html b/test/wpt/tests/resources/test/tests/unit/single_test.html
new file mode 100644
index 00000000000..ff766e66cec
--- /dev/null
+++ b/test/wpt/tests/resources/test/tests/unit/single_test.html
@@ -0,0 +1,94 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <meta charset="utf-8">
+  <meta name="timeout" content="long">
+  <script src="/resources/testharness.js"></script>
+  <script src="../../nested-testharness.js"></script>
+  <title>single_test</title>
+</head>
+<body>
+<script>
+promise_test(() => {
+  return makeTest(
+      () => {
+        setup({ single_test: true });
+        done();
+      }
+    ).then(({harness, tests}) => {
+      assert_equals(harness, 'OK');
+      assert_equals(tests['Document title'], 'PASS');
+    });
+}, 'Expected usage');
+
+promise_test(() => {
+  return makeTest(
+      () => {
+        setup({ single_test: true });
+        throw new Error('this error is expected');
+      }
+    ).then(({harness, tests}) => {
+      assert_equals(harness, 'OK');
+      assert_equals(tests['Document title'], 'FAIL');
+    });
+}, 'Uncaught exception');
+
+promise_test(() => {
+  return makeTest(
+      () => {
+        setup({ single_test: true });
+        Promise.reject(new Error('this error is expected'));
+      }
+    ).then(({harness, tests}) => {
+      assert_equals(harness, 'OK');
+      assert_equals(tests['Document title'], 'FAIL');
+    });
+}, 'Unhandled rejection');
+
+promise_test(() => {
+  return makeTest(
+      () => {
+        setup({ single_test: true });
+        test(function() {}, 'sync test');
+      }
+    ).then(({harness, tests}) => {
+      assert_equals(harness, 'OK');
+      assert_equals(tests['Document title'], 'FAIL');
+      assert_equals(
+        Object.keys(tests).length, 1, 'no additional subtests created'
+      );
+    });
+}, 'Erroneous usage: subtest declaration (synchronous test)');
+
+promise_test(() => {
+  return makeTest(
+      () => {
+        setup({ single_test: true });
+        async_test(function(t) { t.done(); }, 'async test');
+      }
+    ).then(({harness, tests}) => {
+      assert_equals(harness, 'OK');
+      assert_equals(tests['Document title'], 'FAIL');
+      assert_equals(
+        Object.keys(tests).length, 1, 'no additional subtests created'
+      );
+    });
+}, 'Erroneous usage: subtest declaration (asynchronous test)');
+
+promise_test(() => {
+  return makeTest(
+      () => {
+        setup({ single_test: true });
+        promise_test(function() { return Promise.resolve(); }, 'promise test');
+      }
+    ).then(({harness, tests}) => {
+      assert_equals(harness, 'OK');
+      assert_equals(tests['Document title'], 'FAIL');
+      assert_equals(
+        Object.keys(tests).length, 1, 'no additional subtests created'
+      );
+    });
+}, 'Erroneous usage: subtest declaration (promise test)');
+</script>
+</body>
+</html>
diff --git a/test/wpt/tests/resources/test/tests/unit/test-return-restrictions.html b/test/wpt/tests/resources/test/tests/unit/test-return-restrictions.html
new file mode 100644
index 00000000000..0295c5214dc
--- /dev/null
+++ b/test/wpt/tests/resources/test/tests/unit/test-return-restrictions.html
@@ -0,0 +1,156 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <meta charset="utf-8">
+  <script src="/resources/testharness.js"></script>
+  <title>Restrictions on return value from `test`</title>
+</head>
+<body>
+<script>
+function makeTest(...bodies) {
+  const closeScript = '<' + '/script>';
+  let src = `
+<!DOCTYPE HTML>
+<html>
+<head>
+<title>Document title</title>
+<script src="/resources/testharness.js?${Math.random()}">${closeScript}
+</head>
+
+<body>
+<div id="log"></div>`;
+  bodies.forEach((body) => {
+    src += '<script>(' + body + ')();' + closeScript;
+  });
+
+  const iframe = document.createElement('iframe');
+
+  document.body.appendChild(iframe);
+  iframe.contentDocument.write(src);
+
+  return new Promise((resolve) => {
+    window.addEventListener('message', function onMessage(e) {
+      if (e.source !== iframe.contentWindow) {
+        return;
+      }
+      if (!e.data || e.data.type !=='complete') {
+        return;
+      }
+      window.removeEventListener('message', onMessage);
+      resolve(e.data);
+    });
+
+    iframe.contentDocument.close();
+  }).then(({ tests, status }) => {
+    const summary = {
+      harness: {
+        status: getEnumProp(status, status.status),
+        message: status.message
+      },
+      tests: {}
+    };
+
+    tests.forEach((test) => {
+      summary.tests[test.name] = getEnumProp(test, test.status);
+    });
+
+    return summary;
+  });
+}
+
+function getEnumProp(object, value) {
+  for (let property in object) {
+    if (!/^[A-Z]+$/.test(property)) {
+      continue;
+    }
+
+    if (object[property] === value) {
+      return property;
+    }
+  }
+}
+
+promise_test(() => {
+  return makeTest(
+      () => {
+        test(() => undefined, 'before');
+        test(() => null, 'null');
+        test(() => undefined, 'after');
+      }
+    ).then(({harness, tests}) => {
+      assert_equals(harness.status, 'ERROR');
+      assert_equals(
+        harness.message,
+        'Test named "null" passed a function to `test` that returned a value.'
+      );
+      assert_equals(tests.before, 'PASS');
+      assert_equals(tests.null, 'PASS');
+      assert_equals(tests.after, 'PASS');
+    });
+}, 'test returning `null`');
+
+promise_test(() => {
+  return makeTest(
+      () => {
+        test(() => undefined, 'before');
+        test(() => ({}), 'object');
+        test(() => undefined, 'after');
+      }
+    ).then(({harness, tests}) => {
+      assert_equals(harness.status, 'ERROR');
+      assert_equals(
+        harness.message,
+        'Test named "object" passed a function to `test` that returned a value.'
+      );
+      assert_equals(tests.before, 'PASS');
+      assert_equals(tests.object, 'PASS');
+      assert_equals(tests.after, 'PASS');
+    });
+}, 'test returning an ordinary object');
+
+promise_test(() => {
+  return makeTest(
+      () => {
+        test(() => undefined, 'before');
+        test(() => Promise.resolve(5), 'thenable');
+        test(() => undefined, 'after');
+      }
+    ).then(({harness, tests}) => {
+      assert_equals(harness.status, 'ERROR');
+      assert_equals(
+        harness.message,
+        'Test named "thenable" passed a function to `test` that returned a value. ' +
+        'Consider using `promise_test` instead when using Promises or async/await.'
+      );
+      assert_equals(tests.before, 'PASS');
+      assert_equals(tests.thenable, 'PASS');
+      assert_equals(tests.after, 'PASS');
+    });
+}, 'test returning a thenable object');
+
+promise_test(() => {
+  return makeTest(
+      () => {
+        test(() => undefined, 'before');
+        test(() => {
+          const iframe = document.createElement('iframe');
+          iframe.setAttribute('sandbox', '');
+          document.body.appendChild(iframe);
+          return iframe.contentWindow;
+        }, 'restricted');
+        test(() => undefined, 'after');
+      }
+    ).then(({harness, tests}) => {
+      assert_equals(harness.status, 'ERROR');
+      assert_equals(
+        harness.message,
+        'Test named "restricted" passed a function to `test` that returned a value.'
+      );
+      assert_equals(tests.before, 'PASS');
+      assert_equals(tests.restricted, 'PASS');
+      assert_equals(tests.after, 'PASS');
+    });
+}, 'test returning a restricted object');
+</script>
+</body>
+</html>
diff --git a/test/wpt/tests/resources/test/tests/unit/throwing-assertions.html b/test/wpt/tests/resources/test/tests/unit/throwing-assertions.html
new file mode 100644
index 00000000000..a36a56043cc
--- /dev/null
+++ b/test/wpt/tests/resources/test/tests/unit/throwing-assertions.html
@@ -0,0 +1,268 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <meta charset="utf-8">
+  <meta name="timeout" content="long">
+  <script src="/resources/testharness.js"></script>
+  <title>Test the methods that make assertions about exceptions</title>
+</head>
+<body>
+<script>
+function makeTest(...bodies) {
+  const closeScript = '<' + '/script>';
+  let src = `
+<!DOCTYPE HTML>
+<html>
+<head>
+<title>Document title</title>
+<script src="/resources/testharness.js?${Math.random()}">${closeScript}
+</head>
+
+<body>
+<div id="log"></div>`;
+  bodies.forEach((body) => {
+    src += '<script>(' + body + ')();' + closeScript;
+  });
+
+  const iframe = document.createElement('iframe');
+
+  document.body.appendChild(iframe);
+  iframe.contentDocument.write(src);
+
+  return new Promise((resolve) => {
+    window.addEventListener('message', function onMessage(e) {
+      if (e.source !== iframe.contentWindow) {
+        return;
+      }
+      if (!e.data || e.data.type !=='complete') {
+        return;
+      }
+      window.removeEventListener('message', onMessage);
+      resolve(e.data);
+    });
+
+    iframe.contentDocument.close();
+  }).then(({ tests, status }) => {
+    const summary = {
+      harness: getEnumProp(status, status.status),
+      tests: {}
+    };
+
+    tests.forEach((test) => {
+      summary.tests[test.name] = getEnumProp(test, test.status);
+    });
+
+    return summary;
+  });
+}
+
+function getEnumProp(object, value) {
+  for (let property in object) {
+    if (!/^[A-Z]+$/.test(property)) {
+      continue;
+    }
+
+    if (object[property] === value) {
+      return property;
+    }
+  }
+}
+
+promise_test(() => {
+  return makeTest(() => {
+    test(() => {
+      assert_throws_js(TypeError, () => { throw new TypeError(); });
+    });
+  }).then(({harness, tests}) => {
+    assert_equals(harness, 'OK');
+    assert_equals(tests['Document title'], 'PASS');
+  });
+}, 'assert_throws_js on a TypeError');
+
+promise_test(() => {
+  return makeTest(() => {
+    test(() => {
+      assert_throws_js(RangeError, () => { throw new RangeError(); });
+    });
+  }).then(({harness, tests}) => {
+    assert_equals(harness, 'OK');
+    assert_equals(tests['Document title'], 'PASS');
+  });
+}, 'assert_throws_js on a RangeError');
+
+promise_test(() => {
+  return makeTest(() => {
+    test(() => {
+      assert_throws_js(TypeError, () => { throw new RangeError(); });
+    });
+  }).then(({harness, tests}) => {
+    assert_equals(harness, 'OK');
+    assert_equals(tests['Document title'], 'FAIL');
+  });
+}, 'assert_throws_js on a TypeError when RangeError is thrown');
+
+promise_test(() => {
+  return makeTest(() => {
+    test(() => {
+      assert_throws_js(Error, () => { throw new TypeError(); });
+    });
+  }).then(({harness, tests}) => {
+    assert_equals(harness, 'OK');
+    assert_equals(tests['Document title'], 'FAIL');
+  });
+}, 'assert_throws_js on an Error when TypeError is thrown');
+
+promise_test(() => {
+  return makeTest(() => {
+    test(() => {
+      assert_throws_js(Error,
+                       () => { throw new DOMException("hello", "Error"); });
+    });
+  }).then(({harness, tests}) => {
+    assert_equals(harness, 'OK');
+    assert_equals(tests['Document title'], 'FAIL');
+  });
+}, 'assert_throws_js on an Error when a DOMException is thrown');
+
+promise_test(() => {
+  return makeTest(() => {
+    test(() => {
+      assert_throws_js(SyntaxError,
+                       () => { throw new DOMException("hey", "SyntaxError"); });
+    });
+  }).then(({harness, tests}) => {
+    assert_equals(harness, 'OK');
+    assert_equals(tests['Document title'], 'FAIL');
+  });
+}, 'assert_throws_js on a SyntaxError when a DOMException is thrown');
+
+promise_test(() => {
+  return makeTest(() => {
+    test(() => {
+      assert_throws_dom("SyntaxError",
+                        () => { throw new DOMException("x", "SyntaxError"); });
+    });
+  }).then(({harness, tests}) => {
+    assert_equals(harness, 'OK');
+    assert_equals(tests['Document title'], 'PASS');
+  });
+}, 'assert_throws_dom basic sanity');
+
+promise_test(() => {
+  return makeTest(() => {
+    test(() => {
+      assert_throws_dom(12,
+                        () => { throw new DOMException("x", "SyntaxError"); });
+    });
+  }).then(({harness, tests}) => {
+    assert_equals(harness, 'OK');
+    assert_equals(tests['Document title'], 'PASS');
+  });
+}, 'assert_throws_dom with numeric code');
+
+promise_test(() => {
+  return makeTest(() => {
+    test(() => {
+      assert_throws_dom("SYNTAX_ERR",
+                        () => { throw new DOMException("x", "SyntaxError"); });
+    });
+  }).then(({harness, tests}) => {
+    assert_equals(harness, 'OK');
+    assert_equals(tests['Document title'], 'PASS');
+  });
+}, 'assert_throws_dom with string name for code');
+
+promise_test(() => {
+  return makeTest(() => {
+    test(() => {
+      assert_throws_dom("DataError",
+                        () => { throw new DOMException("x", "DataError"); });
+    });
+  }).then(({harness, tests}) => {
+    assert_equals(harness, 'OK');
+    assert_equals(tests['Document title'], 'PASS');
+  });
+}, 'assert_throws_dom for a code-less DOMException type');
+
+promise_test(() => {
+  return makeTest(() => {
+    test(() => {
+      assert_throws_dom("NoSuchError",
+                        () => { throw new DOMException("x", "NoSuchError"); });
+    });
+  }).then(({harness, tests}) => {
+    assert_equals(harness, 'OK');
+    assert_equals(tests['Document title'], 'FAIL');
+  });
+}, 'assert_throws_dom for a nonexistent DOMException type');
+
+promise_test(() => {
+  return makeTest(() => {
+    test(() => {
+      assert_throws_dom("SyntaxError", () => { throw new SyntaxError(); });
+    });
+  }).then(({harness, tests}) => {
+    assert_equals(harness, 'OK');
+    assert_equals(tests['Document title'], 'FAIL');
+  });
+}, 'assert_throws_dom when a non-DOM exception is thrown');
+
+promise_test(() => {
+  return makeTest(() => {
+    test(() => {
+      assert_throws_exactly(5, () => { throw 5; });
+    });
+  }).then(({harness, tests}) => {
+    assert_equals(harness, 'OK');
+    assert_equals(tests['Document title'], 'PASS');
+  });
+}, 'assert_throws_exactly with number');
+
+promise_test(() => {
+  return makeTest(() => {
+    test(() => {
+      assert_throws_exactly("foo", () => { throw "foo"; });
+    });
+  }).then(({harness, tests}) => {
+    assert_equals(harness, 'OK');
+    assert_equals(tests['Document title'], 'PASS');
+  });
+}, 'assert_throws_exactly with string');
+
+promise_test(() => {
+  return makeTest(() => {
+    test(() => {
+      assert_throws_exactly({}, () => { throw {}; });
+    });
+  }).then(({harness, tests}) => {
+    assert_equals(harness, 'OK');
+    assert_equals(tests['Document title'], 'FAIL');
+  });
+}, 'assert_throws_exactly with different objects');
+
+promise_test(() => {
+  return makeTest(() => {
+    test(() => {
+      var obj = {};
+      assert_throws_exactly(obj, () => { throw obj; });
+    });
+  }).then(({harness, tests}) => {
+    assert_equals(harness, 'OK');
+    assert_equals(tests['Document title'], 'PASS');
+  });
+}, 'assert_throws_exactly with same object');
+
+promise_test(() => {
+  return makeTest(() => {
+    test(() => {
+      assert_throws_exactly(TypeError, () => { throw new TypeError; });
+    });
+  }).then(({harness, tests}) => {
+    assert_equals(harness, 'OK');
+    assert_equals(tests['Document title'], 'FAIL');
+  });
+}, 'assert_throws_exactly with bogus TypeError bits ');
+
+</script>
+</body>
+</html>
diff --git a/test/wpt/tests/resources/test/tests/unit/unpaired-surrogates.html b/test/wpt/tests/resources/test/tests/unit/unpaired-surrogates.html
new file mode 100644
index 00000000000..b2321113265
--- /dev/null
+++ b/test/wpt/tests/resources/test/tests/unit/unpaired-surrogates.html
@@ -0,0 +1,143 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <meta charset="utf-8">
+  <script src="/resources/testharness.js"></script>
+  <title>Restrictions on return value from `test`</title>
+</head>
+<body>
+<script>
+function makeTest(...bodies) {
+  const closeScript = '<' + '/script>';
+  let src = `
+<!DOCTYPE HTML>
+<html>
+<head>
+<title>Document title</title>
+<script src="/resources/testharness.js?${Math.random()}">${closeScript}
+</head>
+
+<body>
+<div id="log"></div>`;
+  bodies.forEach((body) => {
+    src += '<script>(' + body + ')();' + closeScript;
+  });
+
+  const iframe = document.createElement('iframe');
+
+  document.body.appendChild(iframe);
+  iframe.contentDocument.write(src);
+
+  return new Promise((resolve) => {
+    window.addEventListener('message', function onMessage(e) {
+      if (e.source !== iframe.contentWindow) {
+        return;
+      }
+      if (!e.data || e.data.type !=='complete') {
+        return;
+      }
+      window.removeEventListener('message', onMessage);
+      resolve(e.data);
+    });
+
+    iframe.contentDocument.close();
+  }).then(({ tests, status }) => {
+    const summary = {
+      harness: {
+        status: getEnumProp(status, status.status),
+        message: status.message
+      },
+      tests: {}
+    };
+
+    tests.forEach((test) => {
+      summary.tests[test.name] = getEnumProp(test, test.status);
+    });
+
+    return summary;
+  });
+}
+
+function getEnumProp(object, value) {
+  for (let property in object) {
+    if (!/^[A-Z]+$/.test(property)) {
+      continue;
+    }
+
+    if (object[property] === value) {
+      return property;
+    }
+  }
+}
+
+promise_test(() => {
+  return makeTest(
+      () => {
+        test(() => {}, 'before');
+        test(() => {}, 'U+d7ff is not modified: \ud7ff');
+        test(() => {}, 'U+e000 is not modified: \ue000');
+        test(() => {}, 'after');
+      }
+    ).then(({harness, tests}) => {
+      assert_equals(harness.status, 'OK');
+      assert_equals(harness.message, null);
+      assert_equals(tests.before, 'PASS');
+      assert_equals(tests['U+d7ff is not modified: \ud7ff'], 'PASS');
+      assert_equals(tests['U+e000 is not modified: \ue000'], 'PASS');
+      assert_equals(tests.after, 'PASS');
+    });
+}, 'sub-test names which include valid code units');
+
+promise_test(() => {
+  return makeTest(
+      () => {
+        test(() => {}, 'before');
+        test(() => {}, 'U+d800U+dfff is not modified: \ud800\udfff');
+        test(() => {}, 'U+dbffU+dc00 is not modified: \udbff\udc00');
+        test(() => {}, 'after');
+      }
+    ).then(({harness, tests}) => {
+      assert_equals(harness.status, 'OK');
+      assert_equals(harness.message, null);
+      assert_equals(tests.before, 'PASS');
+      assert_equals(tests['U+d800U+dfff is not modified: \ud800\udfff'], 'PASS');
+      assert_equals(tests['U+dbffU+dc00 is not modified: \udbff\udc00'], 'PASS');
+      assert_equals(tests.after, 'PASS');
+    });
+}, 'sub-test names which include paired surrogates');
+
+promise_test(() => {
+  return makeTest(
+      () => {
+        test(() => {}, 'before');
+        test(() => {}, 'U+d800 must be sanitized: \ud800');
+        test(() => {}, 'U+d800U+d801 must be sanitized: \ud800\ud801');
+        test(() => {}, 'U+dfff must be sanitized: \udfff');
+        test(() => {}, 'U+dc00U+d800U+dc00U+d800 must be sanitized: \udc00\ud800\udc00\ud800');
+        test(() => {}, 'U+dbffU+dfffU+dfff must be sanitized: \udbff\udfff\udfff');
+        test(() => {}, 'after');
+      }
+    ).then(({harness, tests}) => {
+      assert_equals(harness.status, 'OK');
+      assert_equals(harness.message, null);
+      assert_equals(tests.before, 'PASS');
+      assert_equals(tests['U+d800 must be sanitized: U+d800'], 'PASS');
+      assert_equals(tests['U+dfff must be sanitized: U+dfff'], 'PASS');
+      assert_equals(
+        tests['U+d800U+d801 must be sanitized: U+d800U+d801'],
+        'PASS'
+      );
+      assert_equals(
+        tests['U+dc00U+d800U+dc00U+d800 must be sanitized: U+dc00\ud800\udc00U+d800'],
+        'PASS'
+      );
+      assert_equals(
+        tests['U+dbffU+dfffU+dfff must be sanitized: \udbff\udfffU+dfff'],
+        'PASS'
+      );
+      assert_equals(tests.after, 'PASS');
+    });
+}, 'sub-test names which include unpaired surrogates');
+</script>
+</body>
+</html>
diff --git a/test/wpt/tests/resources/test/tox.ini b/test/wpt/tests/resources/test/tox.ini
new file mode 100644
index 00000000000..cc07e3b028c
--- /dev/null
+++ b/test/wpt/tests/resources/test/tox.ini
@@ -0,0 +1,13 @@
+[tox]
+envlist = py36,py37,py38,py39,py310
+skipsdist=True
+
+[testenv]
+passenv=DISPLAY # Necessary for the spawned GeckoDriver process to connect to
+                # the appropriate display.
+
+deps =
+  -r{toxinidir}/../../tools/requirements_pytest.txt
+  -r{toxinidir}/requirements.txt
+
+commands = pytest -vv {posargs}
diff --git a/test/wpt/tests/resources/test/wptserver.py b/test/wpt/tests/resources/test/wptserver.py
new file mode 100644
index 00000000000..1f913dd96d0
--- /dev/null
+++ b/test/wpt/tests/resources/test/wptserver.py
@@ -0,0 +1,58 @@
+import logging
+import os
+import subprocess
+import time
+import sys
+import urllib
+
+
+class WPTServer(object):
+    def __init__(self, wpt_root):
+        self.logger = logging.getLogger()
+        self.wpt_root = wpt_root
+
+        # This is a terrible hack to get the default config of wptserve.
+        sys.path.insert(0, os.path.join(wpt_root, "tools"))
+        from serve.serve import build_config
+        with build_config(self.logger) as config:
+            self.host = config["browser_host"]
+            self.http_port = config["ports"]["http"][0]
+            self.https_port = config["ports"]["https"][0]
+
+        self.base_url = 'http://%s:%s' % (self.host, self.http_port)
+        self.https_base_url = 'https://%s:%s' % (self.host, self.https_port)
+
+    def start(self, ssl_context):
+        self.devnull = open(os.devnull, 'w')
+        wptserve_cmd = [os.path.join(self.wpt_root, 'wpt'), 'serve']
+        if sys.executable:
+            wptserve_cmd[0:0] = [sys.executable]
+        self.logger.info('Executing %s' % ' '.join(wptserve_cmd))
+        self.proc = subprocess.Popen(
+            wptserve_cmd,
+            stderr=self.devnull,
+            cwd=self.wpt_root)
+
+        for retry in range(5):
+            # Exponential backoff.
+            time.sleep(2 ** retry)
+            exit_code = self.proc.poll()
+            if exit_code != None:
+                logging.warning('Command "%s" exited with %s', ' '.join(wptserve_cmd), exit_code)
+                break
+            try:
+                urllib.request.urlopen(self.base_url, timeout=1)
+                urllib.request.urlopen(self.https_base_url, timeout=1, context=ssl_context)
+                return
+            except urllib.error.URLError:
+                pass
+
+        raise Exception('Could not start wptserve on %s' % self.base_url)
+
+    def stop(self):
+        self.proc.terminate()
+        self.proc.wait()
+        self.devnull.close()
+
+    def url(self, abs_path):
+        return self.https_base_url + '/' + os.path.relpath(abs_path, self.wpt_root)
diff --git a/test/wpt/tests/resources/testdriver-actions.js b/test/wpt/tests/resources/testdriver-actions.js
new file mode 100644
index 00000000000..3e5ba74b4ca
--- /dev/null
+++ b/test/wpt/tests/resources/testdriver-actions.js
@@ -0,0 +1,599 @@
+(function() {
+  let sourceNameIdx = 0;
+
+  /**
+   * @class
+   * Builder for creating a sequence of actions
+   *
+   *
+   * The actions are dispatched once
+   * :js:func:`test_driver.Actions.send` is called. This returns a
+   * promise which resolves once the actions are complete.
+   *
+   * The other methods on :js:class:`test_driver.Actions` object are
+   * used to build the sequence of actions that will be sent. These
+   * return the `Actions` object itself, so the actions sequence can
+   * be constructed by chaining method calls.
+   *
+   * Internally :js:func:`test_driver.Actions.send` invokes
+   * :js:func:`test_driver.action_sequence`.
+   *
+   * @example
+   * let text_box = document.getElementById("text");
+   *
+   * let actions = new test_driver.Actions()
+   *    .pointerMove(0, 0, {origin: text_box})
+   *    .pointerDown()
+   *    .pointerUp()
+   *    .addTick()
+   *    .keyDown("p")
+   *    .keyUp("p");
+   *
+   * await actions.send();
+   *
+   * @param {number} [defaultTickDuration] - The default duration of a
+   * tick. Be default this is set ot 16ms, which is one frame time
+   * based on 60Hz display.
+   */
+  function Actions(defaultTickDuration=16) {
+    this.sourceTypes = new Map([["key", KeySource],
+                                ["pointer", PointerSource],
+                                ["wheel", WheelSource],
+                                ["none", GeneralSource]]);
+    this.sources = new Map();
+    this.sourceOrder = [];
+    for (let sourceType of this.sourceTypes.keys()) {
+      this.sources.set(sourceType, new Map());
+    }
+    this.currentSources = new Map();
+    for (let sourceType of this.sourceTypes.keys()) {
+      this.currentSources.set(sourceType, null);
+    }
+    this.createSource("none");
+    this.tickIdx = 0;
+    this.defaultTickDuration = defaultTickDuration;
+    this.context = null;
+  }
+
+  Actions.prototype = {
+    ButtonType: {
+      LEFT: 0,
+      MIDDLE: 1,
+      RIGHT: 2,
+      BACK: 3,
+      FORWARD: 4,
+    },
+
+    /**
+     * Generate the action sequence suitable for passing to
+     * test_driver.action_sequence
+     *
+     * @returns {Array} Array of WebDriver-compatible actions sequences
+     */
+    serialize: function() {
+      let actions = [];
+      for (let [sourceType, sourceName] of this.sourceOrder) {
+        let source = this.sources.get(sourceType).get(sourceName);
+        let serialized = source.serialize(this.tickIdx + 1, this.defaultTickDuration);
+        if (serialized) {
+          serialized.id = sourceName;
+          actions.push(serialized);
+        }
+      }
+      return actions;
+    },
+
+    /**
+     * Generate and send the action sequence
+     *
+     * @returns {Promise} fulfilled after the sequence is executed,
+     *                    rejected if any actions fail.
+     */
+    send: function() {
+      let actions;
+      try {
+        actions = this.serialize();
+      } catch(e) {
+        return Promise.reject(e);
+      }
+      return test_driver.action_sequence(actions, this.context);
+    },
+
+    /**
+     * Set the context for the actions
+     *
+     * @param {WindowProxy} context - Context in which to run the action sequence
+     */
+    setContext: function(context) {
+      this.context = context;
+      return this;
+    },
+
+    /**
+     * Get the action source with a particular source type and name.
+     * If no name is passed, a new source with the given type is
+     * created.
+     *
+     * @param {String} type - Source type ('none', 'key', 'pointer', or 'wheel')
+     * @param {String?} name - Name of the source
+     * @returns {Source} Source object for that source.
+     */
+    getSource: function(type, name) {
+      if (!this.sources.has(type)) {
+        throw new Error(`${type} is not a valid action type`);
+      }
+      if (name === null || name === undefined) {
+        name = this.currentSources.get(type);
+      }
+      if (name === null || name === undefined) {
+        return this.createSource(type, null);
+      }
+      return this.sources.get(type).get(name);
+    },
+
+    setSource: function(type, name) {
+      if (!this.sources.has(type)) {
+        throw new Error(`${type} is not a valid action type`);
+      }
+      if (!this.sources.get(type).has(name)) {
+        throw new Error(`${name} is not a valid source for ${type}`);
+      }
+      this.currentSources.set(type, name);
+      return this;
+    },
+
+    /**
+     * Add a new key input source with the given name
+     *
+     * @param {String} name - Name of the key source
+     * @param {Bool} set - Set source as the default key source
+     * @returns {Actions}
+     */
+    addKeyboard: function(name, set=true) {
+      this.createSource("key", name);
+      if (set) {
+        this.setKeyboard(name);
+      }
+      return this;
+    },
+
+    /**
+     * Set the current default key source
+     *
+     * @param {String} name - Name of the key source
+     * @returns {Actions}
+     */
+    setKeyboard: function(name) {
+      this.setSource("key", name);
+      return this;
+    },
+
+    /**
+     * Add a new pointer input source with the given name
+     *
+     * @param {String} type - Name of the pointer source
+     * @param {String} pointerType - Type of pointing device
+     * @param {Bool} set - Set source as the default pointer source
+     * @returns {Actions}
+     */
+    addPointer: function(name, pointerType="mouse", set=true) {
+      this.createSource("pointer", name, {pointerType: pointerType});
+      if (set) {
+        this.setPointer(name);
+      }
+      return this;
+    },
+
+    /**
+     * Set the current default pointer source
+     *
+     * @param {String} name - Name of the pointer source
+     * @returns {Actions}
+     */
+    setPointer: function(name) {
+      this.setSource("pointer", name);
+      return this;
+    },
+
+    /**
+     * Add a new wheel input source with the given name
+     *
+     * @param {String} type - Name of the wheel source
+     * @param {Bool} set - Set source as the default wheel source
+     * @returns {Actions}
+     */
+    addWheel: function(name, set=true) {
+      this.createSource("wheel", name);
+      if (set) {
+        this.setWheel(name);
+      }
+      return this;
+    },
+
+    /**
+     * Set the current default wheel source
+     *
+     * @param {String} name - Name of the wheel source
+     * @returns {Actions}
+     */
+    setWheel: function(name) {
+      this.setSource("wheel", name);
+      return this;
+    },
+
+    createSource: function(type, name, parameters={}) {
+      if (!this.sources.has(type)) {
+        throw new Error(`${type} is not a valid action type`);
+      }
+      let sourceNames = new Set();
+      for (let [_, name] of this.sourceOrder) {
+        sourceNames.add(name);
+      }
+      if (!name) {
+        do {
+          name = "" + sourceNameIdx++;
+        } while (sourceNames.has(name))
+      } else {
+        if (sourceNames.has(name)) {
+          throw new Error(`Alreay have a source of type ${type} named ${name}.`);
+        }
+      }
+      this.sources.get(type).set(name, new (this.sourceTypes.get(type))(parameters));
+      this.currentSources.set(type, name);
+      this.sourceOrder.push([type, name]);
+      return this.sources.get(type).get(name);
+    },
+
+    /**
+     * Insert a new actions tick
+     *
+     * @param {Number?} duration - Minimum length of the tick in ms.
+     * @returns {Actions}
+     */
+    addTick: function(duration) {
+      this.tickIdx += 1;
+      if (duration) {
+        this.pause(duration);
+      }
+      return this;
+    },
+
+    /**
+     * Add a pause to the current tick
+     *
+     * @param {Number?} duration - Minimum length of the tick in ms.
+     * @param {String} sourceType - source type
+     * @param {String?} sourceName - Named key, pointer or wheel source to use
+     *                               or null for the default key, pointer or
+     *                               wheel source
+     * @returns {Actions}
+     */
+    pause: function(duration=0, sourceType="none", {sourceName=null}={}) {
+      if (sourceType=="none")
+        this.getSource("none").addPause(this, duration);
+      else
+        this.getSource(sourceType, sourceName).addPause(this, duration);
+      return this;
+    },
+
+    /**
+     * Create a keyDown event for the current default key source
+     *
+     * @param {String} key - Key to press
+     * @param {String?} sourceName - Named key source to use or null for the default key source
+     * @returns {Actions}
+     */
+    keyDown: function(key, {sourceName=null}={}) {
+      let source = this.getSource("key", sourceName);
+      source.keyDown(this, key);
+      return this;
+    },
+
+    /**
+     * Create a keyDown event for the current default key source
+     *
+     * @param {String} key - Key to release
+     * @param {String?} sourceName - Named key source to use or null for the default key source
+     * @returns {Actions}
+     */
+    keyUp: function(key, {sourceName=null}={}) {
+      let source = this.getSource("key", sourceName);
+      source.keyUp(this, key);
+      return this;
+    },
+
+    /**
+     * Create a pointerDown event for the current default pointer source
+     *
+     * @param {String} button - Button to press
+     * @param {String?} sourceName - Named pointer source to use or null for the default
+     *                               pointer source
+     * @returns {Actions}
+     */
+    pointerDown: function({button=this.ButtonType.LEFT, sourceName=null,
+                           width, height, pressure, tangentialPressure,
+                           tiltX, tiltY, twist, altitudeAngle, azimuthAngle}={}) {
+      let source = this.getSource("pointer", sourceName);
+      source.pointerDown(this, button, width, height, pressure, tangentialPressure,
+                         tiltX, tiltY, twist, altitudeAngle, azimuthAngle);
+      return this;
+    },
+
+    /**
+     * Create a pointerUp event for the current default pointer source
+     *
+     * @param {String} button - Button to release
+     * @param {String?} sourceName - Named pointer source to use or null for the default pointer
+     *                               source
+     * @returns {Actions}
+     */
+    pointerUp: function({button=this.ButtonType.LEFT, sourceName=null}={}) {
+      let source = this.getSource("pointer", sourceName);
+      source.pointerUp(this, button);
+      return this;
+    },
+
+    /**
+     * Create a move event for the current default pointer source
+     *
+     * @param {Number} x - Destination x coordinate
+     * @param {Number} y - Destination y coordinate
+     * @param {String|Element} origin - Origin of the coordinate system.
+     *                                  Either "pointer", "viewport" or an Element
+     * @param {Number?} duration - Time in ms for the move
+     * @param {String?} sourceName - Named pointer source to use or null for the default pointer
+     *                               source
+     * @returns {Actions}
+     */
+    pointerMove: function(x, y,
+                          {origin="viewport", duration, sourceName=null,
+                           width, height, pressure, tangentialPressure,
+                           tiltX, tiltY, twist, altitudeAngle, azimuthAngle}={}) {
+      let source = this.getSource("pointer", sourceName);
+      source.pointerMove(this, x, y, duration, origin, width, height, pressure,
+                         tangentialPressure, tiltX, tiltY, twist, altitudeAngle,
+                         azimuthAngle);
+      return this;
+    },
+
+    /**
+     * Create a scroll event for the current default wheel source
+     *
+     * @param {Number} x - mouse cursor x coordinate
+     * @param {Number} y - mouse cursor y coordinate
+     * @param {Number} deltaX - scroll delta value along the x-axis in pixels
+     * @param {Number} deltaY - scroll delta value along the y-axis in pixels
+     * @param {String|Element} origin - Origin of the coordinate system.
+     *                                  Either "viewport" or an Element
+     * @param {Number?} duration - Time in ms for the scroll
+     * @param {String?} sourceName - Named wheel source to use or null for the
+     *                               default wheel source
+     * @returns {Actions}
+     */
+    scroll: function(x, y, deltaX, deltaY,
+                     {origin="viewport", duration, sourceName=null}={}) {
+      let source = this.getSource("wheel", sourceName);
+      source.scroll(this, x, y, deltaX, deltaY, duration, origin);
+      return this;
+    },
+  };
+
+  function GeneralSource() {
+    this.actions = new Map();
+  }
+
+  GeneralSource.prototype = {
+    serialize: function(tickCount, defaultTickDuration) {
+      let actions = [];
+      let data = {"type": "none", "actions": actions};
+      for (let i=0; i<tickCount; i++) {
+        if (this.actions.has(i)) {
+          actions.push(this.actions.get(i));
+        } else {
+          actions.push({"type": "pause", duration: defaultTickDuration});
+        }
+      }
+      return data;
+    },
+
+    addPause: function(actions, duration) {
+      let tick = actions.tickIdx;
+      if (this.actions.has(tick)) {
+        throw new Error(`Already have a pause action for the current tick`);
+      }
+      this.actions.set(tick, {type: "pause", duration: duration});
+    },
+  };
+
+  function KeySource() {
+    this.actions = new Map();
+  }
+
+  KeySource.prototype = {
+    serialize: function(tickCount) {
+      if (!this.actions.size) {
+        return undefined;
+      }
+      let actions = [];
+      let data = {"type": "key", "actions": actions};
+      for (let i=0; i<tickCount; i++) {
+        if (this.actions.has(i)) {
+          actions.push(this.actions.get(i));
+        } else {
+          actions.push({"type": "pause"});
+        }
+      }
+      return data;
+    },
+
+    keyDown: function(actions, key) {
+      let tick = actions.tickIdx;
+      if (this.actions.has(tick)) {
+        tick = actions.addTick().tickIdx;
+      }
+      this.actions.set(tick, {type: "keyDown", value: key});
+    },
+
+    keyUp: function(actions, key) {
+      let tick = actions.tickIdx;
+      if (this.actions.has(tick)) {
+        tick = actions.addTick().tickIdx;
+      }
+      this.actions.set(tick, {type: "keyUp", value: key});
+    },
+
+    addPause: function(actions, duration) {
+      let tick = actions.tickIdx;
+      if (this.actions.has(tick)) {
+        tick = actions.addTick().tickIdx;
+      }
+      this.actions.set(tick, {type: "pause", duration: duration});
+    },
+  };
+
+  function PointerSource(parameters={pointerType: "mouse"}) {
+    let pointerType = parameters.pointerType || "mouse";
+    if (!["mouse", "pen", "touch"].includes(pointerType)) {
+      throw new Error(`Invalid pointerType ${pointerType}`);
+    }
+    this.type = pointerType;
+    this.actions = new Map();
+  }
+
+  function setPointerProperties(action, width, height, pressure, tangentialPressure,
+                                tiltX, tiltY, twist, altitudeAngle, azimuthAngle) {
+    if (width) {
+      action.width = width;
+    }
+    if (height) {
+      action.height = height;
+    }
+    if (pressure) {
+      action.pressure = pressure;
+    }
+    if (tangentialPressure) {
+      action.tangentialPressure = tangentialPressure;
+    }
+    if (tiltX) {
+      action.tiltX = tiltX;
+    }
+    if (tiltY) {
+      action.tiltY = tiltY;
+    }
+    if (twist) {
+      action.twist = twist;
+    }
+    if (altitudeAngle) {
+      action.altitudeAngle = altitudeAngle;
+    }
+    if (azimuthAngle) {
+      action.azimuthAngle = azimuthAngle;
+    }
+    return action;
+  }
+
+  PointerSource.prototype = {
+    serialize: function(tickCount) {
+      if (!this.actions.size) {
+        return undefined;
+      }
+      let actions = [];
+      let data = {"type": "pointer", "actions": actions, "parameters": {"pointerType": this.type}};
+      for (let i=0; i<tickCount; i++) {
+        if (this.actions.has(i)) {
+          actions.push(this.actions.get(i));
+        } else {
+          actions.push({"type": "pause"});
+        }
+      }
+      return data;
+    },
+
+    pointerDown: function(actions, button, width, height, pressure, tangentialPressure,
+                          tiltX, tiltY, twist, altitudeAngle, azimuthAngle) {
+      let tick = actions.tickIdx;
+      if (this.actions.has(tick)) {
+        tick = actions.addTick().tickIdx;
+      }
+      let actionProperties = setPointerProperties({type: "pointerDown", button}, width, height,
+                                                  pressure, tangentialPressure, tiltX, tiltY,
+                                                  twist, altitudeAngle, azimuthAngle);
+      this.actions.set(tick, actionProperties);
+    },
+
+    pointerUp: function(actions, button) {
+      let tick = actions.tickIdx;
+      if (this.actions.has(tick)) {
+        tick = actions.addTick().tickIdx;
+      }
+      this.actions.set(tick, {type: "pointerUp", button});
+    },
+
+    pointerMove: function(actions, x, y, duration, origin, width, height, pressure,
+                          tangentialPressure, tiltX, tiltY, twist, altitudeAngle, azimuthAngle) {
+      let tick = actions.tickIdx;
+      if (this.actions.has(tick)) {
+        tick = actions.addTick().tickIdx;
+      }
+      let moveAction = {type: "pointerMove", x, y, origin};
+      if (duration) {
+        moveAction.duration = duration;
+      }
+      let actionProperties = setPointerProperties(moveAction, width, height, pressure,
+                                                  tangentialPressure, tiltX, tiltY, twist,
+                                                  altitudeAngle, azimuthAngle);
+      this.actions.set(tick, actionProperties);
+    },
+
+    addPause: function(actions, duration) {
+      let tick = actions.tickIdx;
+      if (this.actions.has(tick)) {
+        tick = actions.addTick().tickIdx;
+      }
+      this.actions.set(tick, {type: "pause", duration: duration});
+    },
+  };
+
+  function WheelSource() {
+    this.actions = new Map();
+  }
+
+  WheelSource.prototype = {
+    serialize: function(tickCount) {
+      if (!this.actions.size) {
+        return undefined;
+      }
+      let actions = [];
+      let data = {"type": "wheel", "actions": actions};
+      for (let i=0; i<tickCount; i++) {
+        if (this.actions.has(i)) {
+          actions.push(this.actions.get(i));
+        } else {
+          actions.push({"type": "pause"});
+        }
+      }
+      return data;
+    },
+
+    scroll: function(actions, x, y, deltaX, deltaY, duration, origin) {
+      let tick = actions.tickIdx;
+      if (this.actions.has(tick)) {
+        tick = actions.addTick().tickIdx;
+      }
+      this.actions.set(tick, {type: "scroll", x, y, deltaX, deltaY, origin});
+      if (duration) {
+        this.actions.get(tick).duration = duration;
+      }
+    },
+
+    addPause: function(actions, duration) {
+      let tick = actions.tickIdx;
+      if (this.actions.has(tick)) {
+        tick = actions.addTick().tickIdx;
+      }
+      this.actions.set(tick, {type: "pause", duration: duration});
+    },
+  };
+
+  test_driver.Actions = Actions;
+})();
diff --git a/test/wpt/tests/resources/testdriver-vendor.js b/test/wpt/tests/resources/testdriver-vendor.js
new file mode 100644
index 00000000000..e69de29bb2d
diff --git a/test/wpt/tests/resources/testdriver-vendor.js.headers b/test/wpt/tests/resources/testdriver-vendor.js.headers
new file mode 100644
index 00000000000..5e8f640c665
--- /dev/null
+++ b/test/wpt/tests/resources/testdriver-vendor.js.headers
@@ -0,0 +1,2 @@
+Content-Type: text/javascript; charset=utf-8
+Cache-Control: max-age=3600
diff --git a/test/wpt/tests/resources/testdriver.js b/test/wpt/tests/resources/testdriver.js
new file mode 100644
index 00000000000..76ae2834fdf
--- /dev/null
+++ b/test/wpt/tests/resources/testdriver.js
@@ -0,0 +1,776 @@
+(function() {
+    "use strict";
+    var idCounter = 0;
+    let testharness_context = null;
+
+    function getInViewCenterPoint(rect) {
+        var left = Math.max(0, rect.left);
+        var right = Math.min(window.innerWidth, rect.right);
+        var top = Math.max(0, rect.top);
+        var bottom = Math.min(window.innerHeight, rect.bottom);
+
+        var x = 0.5 * (left + right);
+        var y = 0.5 * (top + bottom);
+
+        return [x, y];
+    }
+
+    function getPointerInteractablePaintTree(element) {
+        let elementDocument = element.ownerDocument;
+        if (!elementDocument.contains(element)) {
+            return [];
+        }
+
+        var rectangles = element.getClientRects();
+
+        if (rectangles.length === 0) {
+            return [];
+        }
+
+        var centerPoint = getInViewCenterPoint(rectangles[0]);
+
+        if ("elementsFromPoint" in elementDocument) {
+            return elementDocument.elementsFromPoint(centerPoint[0], centerPoint[1]);
+        } else if ("msElementsFromPoint" in elementDocument) {
+            var rv = elementDocument.msElementsFromPoint(centerPoint[0], centerPoint[1]);
+            return Array.prototype.slice.call(rv ? rv : []);
+        } else {
+            throw new Error("document.elementsFromPoint unsupported");
+        }
+    }
+
+    function inView(element) {
+        var pointerInteractablePaintTree = getPointerInteractablePaintTree(element);
+        return pointerInteractablePaintTree.indexOf(element) !== -1;
+    }
+
+
+    /**
+     * @namespace {test_driver}
+     */
+    window.test_driver = {
+        /**
+         * Set the context in which testharness.js is loaded
+         *
+         * @param {WindowProxy} context - the window containing testharness.js
+         **/
+        set_test_context: function(context) {
+          if (window.test_driver_internal.set_test_context) {
+            window.test_driver_internal.set_test_context(context);
+          }
+          testharness_context = context;
+        },
+
+        /**
+         * postMessage to the context containing testharness.js
+         *
+         * @param {Object} msg - the data to POST
+         **/
+        message_test: function(msg) {
+            let target = testharness_context;
+            if (testharness_context === null) {
+                target = window;
+            }
+            target.postMessage(msg, "*");
+        },
+
+        /**
+         * Trigger user interaction in order to grant additional privileges to
+         * a provided function.
+         *
+         * See `Tracking user activation
+         * <https://html.spec.whatwg.org/multipage/interaction.html#tracking-user-activation>`_.
+         *
+         * @example
+         * var mediaElement = document.createElement('video');
+         *
+         * test_driver.bless('initiate media playback', function () {
+         *   mediaElement.play();
+         * });
+         *
+         * @param {String} intent - a description of the action which must be
+         *                          triggered by user interaction
+         * @param {Function} action - code requiring escalated privileges
+         * @param {WindowProxy} context - Browsing context in which
+         *                                to run the call, or null for the current
+         *                                browsing context.
+         *
+         * @returns {Promise} fulfilled following user interaction and
+         *                    execution of the provided `action` function;
+         *                    rejected if interaction fails or the provided
+         *                    function throws an error
+         */
+        bless: function(intent, action, context=null) {
+            let contextDocument = context ? context.document : document;
+            var button = contextDocument.createElement("button");
+            button.innerHTML = "This test requires user interaction.<br />" +
+                "Please click here to allow " + intent + ".";
+            button.id = "wpt-test-driver-bless-" + (idCounter += 1);
+            const elem = contextDocument.body || contextDocument.documentElement;
+            elem.appendChild(button);
+
+            let wait_click = new Promise(resolve => button.addEventListener("click", resolve));
+
+            return test_driver.click(button)
+                .then(wait_click)
+                .then(function() {
+                    button.remove();
+
+                    if (typeof action === "function") {
+                        return action();
+                    }
+                    return null;
+                });
+        },
+
+        /**
+         * Triggers a user-initiated click
+         *
+         * If ``element`` isn't inside the
+         * viewport, it will be scrolled into view before the click
+         * occurs.
+         *
+         * If ``element`` is from a different browsing context, the
+         * command will be run in that context.
+         *
+         * Matches the behaviour of the `Element Click
+         * <https://w3c.github.io/webdriver/#element-click>`_
+         * WebDriver command.
+         *
+         * **Note:** If the element to be clicked does not have a
+         * unique ID, the document must not have any DOM mutations
+         * made between the function being called and the promise
+         * settling.
+         *
+         * @param {Element} element - element to be clicked
+         * @returns {Promise} fulfilled after click occurs, or rejected in
+         *                    the cases the WebDriver command errors
+         */
+        click: function(element) {
+            if (!inView(element)) {
+                element.scrollIntoView({behavior: "instant",
+                                        block: "end",
+                                        inline: "nearest"});
+            }
+
+            var pointerInteractablePaintTree = getPointerInteractablePaintTree(element);
+            if (pointerInteractablePaintTree.length === 0 ||
+                !element.contains(pointerInteractablePaintTree[0])) {
+                return Promise.reject(new Error("element click intercepted error"));
+            }
+
+            var rect = element.getClientRects()[0];
+            var centerPoint = getInViewCenterPoint(rect);
+            return window.test_driver_internal.click(element,
+                                                     {x: centerPoint[0],
+                                                      y: centerPoint[1]});
+        },
+
+        /**
+         * Deletes all cookies.
+         *
+         * Matches the behaviour of the `Delete All Cookies
+         * <https://w3c.github.io/webdriver/#delete-all-cookies>`_
+         * WebDriver command.
+         *
+         * @param {WindowProxy} context - Browsing context in which
+         *                                to run the call, or null for the current
+         *                                browsing context.
+         *
+         * @returns {Promise} fulfilled after cookies are deleted, or rejected in
+         *                    the cases the WebDriver command errors
+         */
+        delete_all_cookies: function(context=null) {
+            return window.test_driver_internal.delete_all_cookies(context);
+        },
+
+        /**
+         * Get details for all cookies in the current context.
+         * See https://w3c.github.io/webdriver/#get-all-cookies
+         *
+         * @param {WindowProxy} context - Browsing context in which
+         *                                to run the call, or null for the current
+         *                                browsing context.
+         *
+         * @returns {Promise} Returns an array of cookies objects as defined in the spec:
+         *                    https://w3c.github.io/webdriver/#cookies
+         */
+        get_all_cookies: function(context=null) {
+            return window.test_driver_internal.get_all_cookies(context);
+        },
+
+        /**
+         * Get details for a cookie in the current context by name if it exists.
+         * See https://w3c.github.io/webdriver/#get-named-cookie
+         *
+         * @param {String} name - The name of the cookie to get.
+         * @param {WindowProxy} context - Browsing context in which
+         *                                to run the call, or null for the current
+         *                                browsing context.
+         *
+         * @returns {Promise} Returns the matching cookie as defined in the spec:
+         *                    https://w3c.github.io/webdriver/#cookies
+         *                    Rejected if no such cookie exists.
+         */
+         get_named_cookie: async function(name, context=null) {
+            let cookie = await window.test_driver_internal.get_named_cookie(name, context);
+            if (!cookie) {
+                throw new Error("no such cookie");
+            }
+            return cookie;
+        },
+
+        /**
+         * Send keys to an element.
+         *
+         * If ``element`` isn't inside the
+         * viewport, it will be scrolled into view before the click
+         * occurs.
+         *
+         * If ``element`` is from a different browsing context, the
+         * command will be run in that context.
+         *
+         * To send special keys, send the respective key's codepoint,
+         * as defined by `WebDriver
+         * <https://w3c.github.io/webdriver/#keyboard-actions>`_.  For
+         * example, the "tab" key is represented as "``\uE004``".
+         *
+         * **Note:** these special-key codepoints are not necessarily
+         * what you would expect. For example, <kbd>Esc</kbd> is the
+         * invalid Unicode character ``\uE00C``, not the ``\u001B`` Escape
+         * character from ASCII.
+         *
+         * This matches the behaviour of the
+         * `Send Keys
+         * <https://w3c.github.io/webdriver/#element-send-keys>`_
+         * WebDriver command.
+         *
+         * **Note:** If the element to be clicked does not have a
+         * unique ID, the document must not have any DOM mutations
+         * made between the function being called and the promise
+         * settling.
+         *
+         * @param {Element} element - element to send keys to
+         * @param {String} keys - keys to send to the element
+         * @returns {Promise} fulfilled after keys are sent, or rejected in
+         *                    the cases the WebDriver command errors
+         */
+        send_keys: function(element, keys) {
+            if (!inView(element)) {
+                element.scrollIntoView({behavior: "instant",
+                                        block: "end",
+                                        inline: "nearest"});
+            }
+
+            var pointerInteractablePaintTree = getPointerInteractablePaintTree(element);
+            if (pointerInteractablePaintTree.length === 0 ||
+                !element.contains(pointerInteractablePaintTree[0])) {
+                return Promise.reject(new Error("element send_keys intercepted error"));
+            }
+
+            return window.test_driver_internal.send_keys(element, keys);
+        },
+
+        /**
+         * Freeze the current page
+         *
+         * The freeze function transitions the page from the HIDDEN state to
+         * the FROZEN state as described in `Lifecycle API for Web Pages
+         * <https://github.com/WICG/page-lifecycle/blob/master/README.md>`_.
+         *
+         * @param {WindowProxy} context - Browsing context in which
+         *                                to run the call, or null for the current
+         *                                browsing context.
+         *
+         * @returns {Promise} fulfilled after the freeze request is sent, or rejected
+         *                    in case the WebDriver command errors
+         */
+        freeze: function(context=null) {
+            return window.test_driver_internal.freeze();
+        },
+
+        /**
+         * Minimizes the browser window.
+         *
+         * Matches the the behaviour of the `Minimize
+         * <https://www.w3.org/TR/webdriver/#minimize-window>`_
+         * WebDriver command
+         *
+         * @param {WindowProxy} context - Browsing context in which
+         *                                to run the call, or null for the current
+         *                                browsing context.
+         *
+         * @returns {Promise} fulfilled with the previous {@link
+         *                    https://www.w3.org/TR/webdriver/#dfn-windowrect-object|WindowRect}
+         *                      value, after the window is minimized.
+         */
+        minimize_window: function(context=null) {
+            return window.test_driver_internal.minimize_window(context);
+        },
+
+        /**
+         * Restore the window from minimized/maximized state to a given rect.
+         *
+         * Matches the behaviour of the `Set Window Rect
+         * <https://www.w3.org/TR/webdriver/#set-window-rect>`_
+         * WebDriver command
+         *
+         * @param {Object} rect - A {@link
+         *                           https://www.w3.org/TR/webdriver/#dfn-windowrect-object|WindowRect}
+         * @param {WindowProxy} context - Browsing context in which
+         *                                to run the call, or null for the current
+         *                                browsing context.
+         *
+         * @returns {Promise} fulfilled after the window is restored to the given rect.
+         */
+        set_window_rect: function(rect, context=null) {
+            return window.test_driver_internal.set_window_rect(rect, context);
+        },
+
+        /**
+         * Send a sequence of actions
+         *
+         * This function sends a sequence of actions to perform.
+         *
+         * Matches the behaviour of the `Actions
+         * <https://w3c.github.io/webdriver/#actions>`_ feature in
+         * WebDriver.
+         *
+         * Authors are encouraged to use the
+         * :js:class:`test_driver.Actions` builder rather than
+         * invoking this API directly.
+         *
+         * @param {Array} actions - an array of actions. The format is
+         *                          the same as the actions property
+         *                          of the `Perform Actions
+         *                          <https://w3c.github.io/webdriver/#perform-actions>`_
+         *                          WebDriver command. Each element is
+         *                          an object representing an input
+         *                          source and each input source
+         *                          itself has an actions property
+         *                          detailing the behaviour of that
+         *                          source at each timestep (or
+         *                          tick). Authors are not expected to
+         *                          construct the actions sequence by
+         *                          hand, but to use the builder api
+         *                          provided in testdriver-actions.js
+         * @param {WindowProxy} context - Browsing context in which
+         *                                to run the call, or null for the current
+         *                                browsing context.
+         *
+         * @returns {Promise} fulfilled after the actions are performed, or rejected in
+         *                    the cases the WebDriver command errors
+         */
+        action_sequence: function(actions, context=null) {
+            return window.test_driver_internal.action_sequence(actions, context);
+        },
+
+        /**
+         * Generates a test report on the current page
+         *
+         * The generate_test_report function generates a report (to be
+         * observed by ReportingObserver) for testing purposes.
+         *
+         * Matches the `Generate Test Report
+         * <https://w3c.github.io/reporting/#generate-test-report-command>`_
+         * WebDriver command.
+         *
+         * @param {WindowProxy} context - Browsing context in which
+         *                                to run the call, or null for the current
+         *                                browsing context.
+         *
+         * @returns {Promise} fulfilled after the report is generated, or
+         *                    rejected if the report generation fails
+         */
+        generate_test_report: function(message, context=null) {
+            return window.test_driver_internal.generate_test_report(message, context);
+        },
+
+        /**
+         * Sets the state of a permission
+         *
+         * This function simulates a user setting a permission into a
+         * particular state.
+         *
+         * Matches the `Set Permission
+         * <https://w3c.github.io/permissions/#set-permission-command>`_
+         * WebDriver command.
+         *
+         * @example
+         * await test_driver.set_permission({ name: "background-fetch" }, "denied");
+         * await test_driver.set_permission({ name: "push", userVisibleOnly: true }, "granted");
+         *
+         * @param {PermissionDescriptor} descriptor - a `PermissionDescriptor
+         *                              <https://w3c.github.io/permissions/#dom-permissiondescriptor>`_
+         *                              dictionary.
+         * @param {String} state - the state of the permission
+         * @param {WindowProxy} context - Browsing context in which
+         *                                to run the call, or null for the current
+         *                                browsing context.
+         * @returns {Promise} fulfilled after the permission is set, or rejected if setting the
+         *                    permission fails
+         */
+        set_permission: function(descriptor, state, context=null) {
+            let permission_params = {
+              descriptor,
+              state,
+            };
+            return window.test_driver_internal.set_permission(permission_params, context);
+        },
+
+        /**
+         * Creates a virtual authenticator
+         *
+         * This function creates a virtual authenticator for use with
+         * the U2F and WebAuthn APIs.
+         *
+         * Matches the `Add Virtual Authenticator
+         * <https://w3c.github.io/webauthn/#sctn-automation-add-virtual-authenticator>`_
+         * WebDriver command.
+         *
+         * @param {Object} config - an `Authenticator Configuration
+         *                          <https://w3c.github.io/webauthn/#authenticator-configuration>`_
+         *                          object
+         * @param {WindowProxy} context - Browsing context in which
+         *                                to run the call, or null for the current
+         *                                browsing context.
+         *
+         * @returns {Promise} fulfilled after the authenticator is added, or
+         *                    rejected in the cases the WebDriver command
+         *                    errors. Returns the ID of the authenticator
+         */
+        add_virtual_authenticator: function(config, context=null) {
+            return window.test_driver_internal.add_virtual_authenticator(config, context);
+        },
+
+        /**
+         * Removes a virtual authenticator
+         *
+         * This function removes a virtual authenticator that has been
+         * created by :js:func:`add_virtual_authenticator`.
+         *
+         * Matches the `Remove Virtual Authenticator
+         * <https://w3c.github.io/webauthn/#sctn-automation-remove-virtual-authenticator>`_
+         * WebDriver command.
+         *
+         * @param {String} authenticator_id - the ID of the authenticator to be
+         *                                    removed.
+         * @param {WindowProxy} context - Browsing context in which
+         *                                to run the call, or null for the current
+         *                                browsing context.
+         *
+         * @returns {Promise} fulfilled after the authenticator is removed, or
+         *                    rejected in the cases the WebDriver command
+         *                    errors
+         */
+        remove_virtual_authenticator: function(authenticator_id, context=null) {
+            return window.test_driver_internal.remove_virtual_authenticator(authenticator_id, context);
+        },
+
+        /**
+         * Adds a credential to a virtual authenticator
+         *
+         * Matches the `Add Credential
+         * <https://w3c.github.io/webauthn/#sctn-automation-add-credential>`_
+         * WebDriver command.
+         *
+         * @param {String} authenticator_id - the ID of the authenticator
+         * @param {Object} credential - A `Credential Parameters
+         *                              <https://w3c.github.io/webauthn/#credential-parameters>`_
+         *                              object
+         * @param {WindowProxy} context - Browsing context in which
+         *                                to run the call, or null for the current
+         *                                browsing context.
+         *
+         * @returns {Promise} fulfilled after the credential is added, or
+         *                    rejected in the cases the WebDriver command
+         *                    errors
+         */
+        add_credential: function(authenticator_id, credential, context=null) {
+            return window.test_driver_internal.add_credential(authenticator_id, credential, context);
+        },
+
+        /**
+         * Gets all the credentials stored in an authenticator
+         *
+         * This function retrieves all the credentials (added via the U2F API,
+         * WebAuthn, or the add_credential function) stored in a virtual
+         * authenticator
+         *
+         * Matches the `Get Credentials
+         * <https://w3c.github.io/webauthn/#sctn-automation-get-credentials>`_
+         * WebDriver command.
+         *
+         * @param {String} authenticator_id - the ID of the authenticator
+         * @param {WindowProxy} context - Browsing context in which
+         *                                to run the call, or null for the current
+         *                                browsing context.
+         *
+         * @returns {Promise} fulfilled after the credentials are
+         *                    returned, or rejected in the cases the
+         *                    WebDriver command errors. Returns an
+         *                    array of `Credential Parameters
+         *                    <https://w3c.github.io/webauthn/#credential-parameters>`_
+         */
+        get_credentials: function(authenticator_id, context=null) {
+            return window.test_driver_internal.get_credentials(authenticator_id, context=null);
+        },
+
+        /**
+         * Remove a credential stored in an authenticator
+         *
+         * Matches the `Remove Credential
+         * <https://w3c.github.io/webauthn/#sctn-automation-remove-credential>`_
+         * WebDriver command.
+         *
+         * @param {String} authenticator_id - the ID of the authenticator
+         * @param {String} credential_id - the ID of the credential
+         * @param {WindowProxy} context - Browsing context in which
+         *                                to run the call, or null for the current
+         *                                browsing context.
+         *
+         * @returns {Promise} fulfilled after the credential is removed, or
+         *                    rejected in the cases the WebDriver command
+         *                    errors.
+         */
+        remove_credential: function(authenticator_id, credential_id, context=null) {
+            return window.test_driver_internal.remove_credential(authenticator_id, credential_id, context);
+        },
+
+        /**
+         * Removes all the credentials stored in a virtual authenticator
+         *
+         * Matches the `Remove All Credentials
+         * <https://w3c.github.io/webauthn/#sctn-automation-remove-all-credentials>`_
+         * WebDriver command.
+         *
+         * @param {String} authenticator_id - the ID of the authenticator
+         * @param {WindowProxy} context - Browsing context in which
+         *                                to run the call, or null for the current
+         *                                browsing context.
+         *
+         * @returns {Promise} fulfilled after the credentials are removed, or
+         *                    rejected in the cases the WebDriver command
+         *                    errors.
+         */
+        remove_all_credentials: function(authenticator_id, context=null) {
+            return window.test_driver_internal.remove_all_credentials(authenticator_id, context);
+        },
+
+        /**
+         * Sets the User Verified flag on an authenticator
+         *
+         * Sets whether requests requiring user verification will succeed or
+         * fail on a given virtual authenticator
+         *
+         * Matches the `Set User Verified
+         * <https://w3c.github.io/webauthn/#sctn-automation-set-user-verified>`_
+         * WebDriver command.
+         *
+         * @param {String} authenticator_id - the ID of the authenticator
+         * @param {boolean} uv - the User Verified flag
+         * @param {WindowProxy} context - Browsing context in which
+         *                                to run the call, or null for the current
+         *                                browsing context.
+         */
+        set_user_verified: function(authenticator_id, uv, context=null) {
+            return window.test_driver_internal.set_user_verified(authenticator_id, uv, context);
+        },
+
+        /**
+         * Sets the storage access rule for an origin when embedded
+         * in a third-party context.
+         *
+         * Matches the `Set Storage Access
+         * <https://privacycg.github.io/storage-access/#set-storage-access-command>`_
+         * WebDriver command.
+         *
+         * @param {String} origin - A third-party origin to block or allow.
+         *                          May be "*" to indicate all origins.
+         * @param {String} embedding_origin - an embedding (first-party) origin
+         *                                    on which {origin}'s access should
+         *                                    be blocked or allowed.
+         *                                    May be "*" to indicate all origins.
+         * @param {String} state - The storage access setting.
+         *                         Must be either "allowed" or "blocked".
+         * @param {WindowProxy} context - Browsing context in which
+         *                                to run the call, or null for the current
+         *                                browsing context.
+         *
+         * @returns {Promise} Fulfilled after the storage access rule has been
+         *                    set, or rejected if setting the rule fails.
+         */
+        set_storage_access: function(origin, embedding_origin, state, context=null) {
+            if (state !== "allowed" && state !== "blocked") {
+                throw new Error("storage access status must be 'allowed' or 'blocked'");
+            }
+            const blocked = state === "blocked";
+            return window.test_driver_internal.set_storage_access(origin, embedding_origin, blocked, context);
+        },
+
+        /**
+         * Sets the current transaction automation mode for Secure Payment
+         * Confirmation.
+         *
+         * This function places `Secure Payment
+         * Confirmation <https://w3c.github.io/secure-payment-confirmation>`_ into
+         * an automated 'autoaccept' or 'autoreject' mode, to allow testing
+         * without user interaction with the transaction UX prompt.
+         *
+         * Matches the `Set SPC Transaction Mode
+         * <https://w3c.github.io/secure-payment-confirmation/#sctn-automation-set-spc-transaction-mode>`_
+         * WebDriver command.
+         *
+         * @example
+         * await test_driver.set_spc_transaction_mode("autoaccept");
+         * test.add_cleanup(() => {
+         *   return test_driver.set_spc_transaction_mode("none");
+         * });
+         *
+         * // Assumption: `request` is a PaymentRequest with a secure-payment-confirmation
+         * // payment method.
+         * const response = await request.show();
+         *
+         * @param {String} mode - The `transaction mode
+         *                        <https://w3c.github.io/secure-payment-confirmation/#enumdef-transactionautomationmode>`_
+         *                        to set. Must be one of "``none``",
+         *                        "``autoaccept``", or
+         *                        "``autoreject``".
+         * @param {WindowProxy} context - Browsing context in which
+         *                                to run the call, or null for the current
+         *                                browsing context.
+         *
+         * @returns {Promise} Fulfilled after the transaction mode has been set,
+         *                    or rejected if setting the mode fails.
+         */
+        set_spc_transaction_mode: function(mode, context=null) {
+          return window.test_driver_internal.set_spc_transaction_mode(mode, context);
+        },
+    };
+
+    window.test_driver_internal = {
+        /**
+         * This flag should be set to `true` by any code which implements the
+         * internal methods defined below for automation purposes. Doing so
+         * allows the library to signal failure immediately when an automated
+         * implementation of one of the methods is not available.
+         */
+        in_automation: false,
+
+        click: function(element, coords) {
+            if (this.in_automation) {
+                return Promise.reject(new Error('Not implemented'));
+            }
+
+            return new Promise(function(resolve, reject) {
+                element.addEventListener("click", resolve);
+            });
+        },
+
+        delete_all_cookies: function(context=null) {
+            return Promise.reject(new Error("unimplemented"));
+        },
+
+        get_all_cookies: function(context=null) {
+            return Promise.reject(new Error("unimplemented"));
+        },
+
+        get_named_cookie: function(name, context=null) {
+            return Promise.reject(new Error("unimplemented"));
+        },
+
+        send_keys: function(element, keys) {
+            if (this.in_automation) {
+                return Promise.reject(new Error('Not implemented'));
+            }
+
+            return new Promise(function(resolve, reject) {
+                var seen = "";
+
+                function remove() {
+                    element.removeEventListener("keydown", onKeyDown);
+                }
+
+                function onKeyDown(event) {
+                    if (event.key.length > 1) {
+                        return;
+                    }
+
+                    seen += event.key;
+
+                    if (keys.indexOf(seen) !== 0) {
+                        reject(new Error("Unexpected key sequence: " + seen));
+                        remove();
+                    } else if (seen === keys) {
+                        resolve();
+                        remove();
+                    }
+                }
+
+                element.addEventListener("keydown", onKeyDown);
+            });
+        },
+
+        freeze: function(context=null) {
+            return Promise.reject(new Error("unimplemented"));
+        },
+
+        minimize_window: function(context=null) {
+            return Promise.reject(new Error("unimplemented"));
+        },
+
+        set_window_rect: function(rect, context=null) {
+            return Promise.reject(new Error("unimplemented"));
+        },
+
+        action_sequence: function(actions, context=null) {
+            return Promise.reject(new Error("unimplemented"));
+        },
+
+        generate_test_report: function(message, context=null) {
+            return Promise.reject(new Error("unimplemented"));
+        },
+
+
+        set_permission: function(permission_params, context=null) {
+            return Promise.reject(new Error("unimplemented"));
+        },
+
+        add_virtual_authenticator: function(config, context=null) {
+            return Promise.reject(new Error("unimplemented"));
+        },
+
+        remove_virtual_authenticator: function(authenticator_id, context=null) {
+            return Promise.reject(new Error("unimplemented"));
+        },
+
+        add_credential: function(authenticator_id, credential, context=null) {
+            return Promise.reject(new Error("unimplemented"));
+        },
+
+        get_credentials: function(authenticator_id, context=null) {
+            return Promise.reject(new Error("unimplemented"));
+        },
+
+        remove_credential: function(authenticator_id, credential_id, context=null) {
+            return Promise.reject(new Error("unimplemented"));
+        },
+
+        remove_all_credentials: function(authenticator_id, context=null) {
+            return Promise.reject(new Error("unimplemented"));
+        },
+
+        set_user_verified: function(authenticator_id, uv, context=null) {
+            return Promise.reject(new Error("unimplemented"));
+        },
+
+        set_storage_access: function(origin, embedding_origin, blocked, context=null) {
+            return Promise.reject(new Error("unimplemented"));
+        },
+
+        set_spc_transaction_mode: function(mode, context=null) {
+            return Promise.reject(new Error("unimplemented"));
+        },
+
+    };
+})();
diff --git a/test/wpt/tests/resources/testdriver.js.headers b/test/wpt/tests/resources/testdriver.js.headers
new file mode 100644
index 00000000000..5e8f640c665
--- /dev/null
+++ b/test/wpt/tests/resources/testdriver.js.headers
@@ -0,0 +1,2 @@
+Content-Type: text/javascript; charset=utf-8
+Cache-Control: max-age=3600
diff --git a/test/wpt/tests/resources/testharness.js b/test/wpt/tests/resources/testharness.js
new file mode 100644
index 00000000000..bed115a99ce
--- /dev/null
+++ b/test/wpt/tests/resources/testharness.js
@@ -0,0 +1,4929 @@
+/*global self*/
+/*jshint latedef: nofunc*/
+
+/* Documentation: https://web-platform-tests.org/writing-tests/testharness-api.html
+ * (../docs/_writing-tests/testharness-api.md) */
+
+(function (global_scope)
+{
+    // default timeout is 10 seconds, test can override if needed
+    var settings = {
+        output:true,
+        harness_timeout:{
+            "normal":10000,
+            "long":60000
+        },
+        test_timeout:null,
+        message_events: ["start", "test_state", "result", "completion"],
+        debug: false,
+    };
+
+    var xhtml_ns = "http://www.w3.org/1999/xhtml";
+
+    /*
+     * TestEnvironment is an abstraction for the environment in which the test
+     * harness is used. Each implementation of a test environment has to provide
+     * the following interface:
+     *
+     * interface TestEnvironment {
+     *   // Invoked after the global 'tests' object has been created and it's
+     *   // safe to call add_*_callback() to register event handlers.
+     *   void on_tests_ready();
+     *
+     *   // Invoked after setup() has been called to notify the test environment
+     *   // of changes to the test harness properties.
+     *   void on_new_harness_properties(object properties);
+     *
+     *   // Should return a new unique default test name.
+     *   DOMString next_default_test_name();
+     *
+     *   // Should return the test harness timeout duration in milliseconds.
+     *   float test_timeout();
+     * };
+     */
+
+    /*
+     * A test environment with a DOM. The global object is 'window'. By default
+     * test results are displayed in a table. Any parent windows receive
+     * callbacks or messages via postMessage() when test events occur. See
+     * apisample11.html and apisample12.html.
+     */
+    function WindowTestEnvironment() {
+        this.name_counter = 0;
+        this.window_cache = null;
+        this.output_handler = null;
+        this.all_loaded = false;
+        var this_obj = this;
+        this.message_events = [];
+        this.dispatched_messages = [];
+
+        this.message_functions = {
+            start: [add_start_callback, remove_start_callback,
+                    function (properties) {
+                        this_obj._dispatch("start_callback", [properties],
+                                           {type: "start", properties: properties});
+                    }],
+
+            test_state: [add_test_state_callback, remove_test_state_callback,
+                         function(test) {
+                             this_obj._dispatch("test_state_callback", [test],
+                                                {type: "test_state",
+                                                 test: test.structured_clone()});
+                         }],
+            result: [add_result_callback, remove_result_callback,
+                     function (test) {
+                         this_obj.output_handler.show_status();
+                         this_obj._dispatch("result_callback", [test],
+                                            {type: "result",
+                                             test: test.structured_clone()});
+                     }],
+            completion: [add_completion_callback, remove_completion_callback,
+                         function (tests, harness_status, asserts) {
+                             var cloned_tests = map(tests, function(test) {
+                                 return test.structured_clone();
+                             });
+                             this_obj._dispatch("completion_callback", [tests, harness_status],
+                                                {type: "complete",
+                                                 tests: cloned_tests,
+                                                 status: harness_status.structured_clone(),
+                                                 asserts: asserts.map(assert => assert.structured_clone())});
+                         }]
+        }
+
+        on_event(window, 'load', function() {
+            this_obj.all_loaded = true;
+        });
+
+        on_event(window, 'message', function(event) {
+            if (event.data && event.data.type === "getmessages" && event.source) {
+                // A window can post "getmessages" to receive a duplicate of every
+                // message posted by this environment so far. This allows subscribers
+                // from fetch_tests_from_window to 'catch up' to the current state of
+                // this environment.
+                for (var i = 0; i < this_obj.dispatched_messages.length; ++i)
+                {
+                    event.source.postMessage(this_obj.dispatched_messages[i], "*");
+                }
+            }
+        });
+    }
+
+    WindowTestEnvironment.prototype._dispatch = function(selector, callback_args, message_arg) {
+        this.dispatched_messages.push(message_arg);
+        this._forEach_windows(
+                function(w, same_origin) {
+                    if (same_origin) {
+                        try {
+                            var has_selector = selector in w;
+                        } catch(e) {
+                            // If document.domain was set at some point same_origin can be
+                            // wrong and the above will fail.
+                            has_selector = false;
+                        }
+                        if (has_selector) {
+                            try {
+                                w[selector].apply(undefined, callback_args);
+                            } catch (e) {}
+                        }
+                    }
+                    if (w !== self) {
+                        w.postMessage(message_arg, "*");
+                    }
+                });
+    };
+
+    WindowTestEnvironment.prototype._forEach_windows = function(callback) {
+        // Iterate over the windows [self ... top, opener]. The callback is passed
+        // two objects, the first one is the window object itself, the second one
+        // is a boolean indicating whether or not it's on the same origin as the
+        // current window.
+        var cache = this.window_cache;
+        if (!cache) {
+            cache = [[self, true]];
+            var w = self;
+            var i = 0;
+            var so;
+            while (w != w.parent) {
+                w = w.parent;
+                so = is_same_origin(w);
+                cache.push([w, so]);
+                i++;
+            }
+            w = window.opener;
+            if (w) {
+                cache.push([w, is_same_origin(w)]);
+            }
+            this.window_cache = cache;
+        }
+
+        forEach(cache,
+                function(a) {
+                    callback.apply(null, a);
+                });
+    };
+
+    WindowTestEnvironment.prototype.on_tests_ready = function() {
+        var output = new Output();
+        this.output_handler = output;
+
+        var this_obj = this;
+
+        add_start_callback(function (properties) {
+            this_obj.output_handler.init(properties);
+        });
+
+        add_test_state_callback(function(test) {
+            this_obj.output_handler.show_status();
+        });
+
+        add_result_callback(function (test) {
+            this_obj.output_handler.show_status();
+        });
+
+        add_completion_callback(function (tests, harness_status, asserts_run) {
+            this_obj.output_handler.show_results(tests, harness_status, asserts_run);
+        });
+        this.setup_messages(settings.message_events);
+    };
+
+    WindowTestEnvironment.prototype.setup_messages = function(new_events) {
+        var this_obj = this;
+        forEach(settings.message_events, function(x) {
+            var current_dispatch = this_obj.message_events.indexOf(x) !== -1;
+            var new_dispatch = new_events.indexOf(x) !== -1;
+            if (!current_dispatch && new_dispatch) {
+                this_obj.message_functions[x][0](this_obj.message_functions[x][2]);
+            } else if (current_dispatch && !new_dispatch) {
+                this_obj.message_functions[x][1](this_obj.message_functions[x][2]);
+            }
+        });
+        this.message_events = new_events;
+    }
+
+    WindowTestEnvironment.prototype.next_default_test_name = function() {
+        var suffix = this.name_counter > 0 ? " " + this.name_counter : "";
+        this.name_counter++;
+        return get_title() + suffix;
+    };
+
+    WindowTestEnvironment.prototype.on_new_harness_properties = function(properties) {
+        this.output_handler.setup(properties);
+        if (properties.hasOwnProperty("message_events")) {
+            this.setup_messages(properties.message_events);
+        }
+    };
+
+    WindowTestEnvironment.prototype.add_on_loaded_callback = function(callback) {
+        on_event(window, 'load', callback);
+    };
+
+    WindowTestEnvironment.prototype.test_timeout = function() {
+        var metas = document.getElementsByTagName("meta");
+        for (var i = 0; i < metas.length; i++) {
+            if (metas[i].name == "timeout") {
+                if (metas[i].content == "long") {
+                    return settings.harness_timeout.long;
+                }
+                break;
+            }
+        }
+        return settings.harness_timeout.normal;
+    };
+
+    /*
+     * Base TestEnvironment implementation for a generic web worker.
+     *
+     * Workers accumulate test results. One or more clients can connect and
+     * retrieve results from a worker at any time.
+     *
+     * WorkerTestEnvironment supports communicating with a client via a
+     * MessagePort.  The mechanism for determining the appropriate MessagePort
+     * for communicating with a client depends on the type of worker and is
+     * implemented by the various specializations of WorkerTestEnvironment
+     * below.
+     *
+     * A client document using testharness can use fetch_tests_from_worker() to
+     * retrieve results from a worker. See apisample16.html.
+     */
+    function WorkerTestEnvironment() {
+        this.name_counter = 0;
+        this.all_loaded = true;
+        this.message_list = [];
+        this.message_ports = [];
+    }
+
+    WorkerTestEnvironment.prototype._dispatch = function(message) {
+        this.message_list.push(message);
+        for (var i = 0; i < this.message_ports.length; ++i)
+        {
+            this.message_ports[i].postMessage(message);
+        }
+    };
+
+    // The only requirement is that port has a postMessage() method. It doesn't
+    // have to be an instance of a MessagePort, and often isn't.
+    WorkerTestEnvironment.prototype._add_message_port = function(port) {
+        this.message_ports.push(port);
+        for (var i = 0; i < this.message_list.length; ++i)
+        {
+            port.postMessage(this.message_list[i]);
+        }
+    };
+
+    WorkerTestEnvironment.prototype.next_default_test_name = function() {
+        var suffix = this.name_counter > 0 ? " " + this.name_counter : "";
+        this.name_counter++;
+        return get_title() + suffix;
+    };
+
+    WorkerTestEnvironment.prototype.on_new_harness_properties = function() {};
+
+    WorkerTestEnvironment.prototype.on_tests_ready = function() {
+        var this_obj = this;
+        add_start_callback(
+                function(properties) {
+                    this_obj._dispatch({
+                        type: "start",
+                        properties: properties,
+                    });
+                });
+        add_test_state_callback(
+                function(test) {
+                    this_obj._dispatch({
+                        type: "test_state",
+                        test: test.structured_clone()
+                    });
+                });
+        add_result_callback(
+                function(test) {
+                    this_obj._dispatch({
+                        type: "result",
+                        test: test.structured_clone()
+                    });
+                });
+        add_completion_callback(
+                function(tests, harness_status, asserts) {
+                    this_obj._dispatch({
+                        type: "complete",
+                        tests: map(tests,
+                            function(test) {
+                                return test.structured_clone();
+                            }),
+                        status: harness_status.structured_clone(),
+                        asserts: asserts.map(assert => assert.structured_clone()),
+                    });
+                });
+    };
+
+    WorkerTestEnvironment.prototype.add_on_loaded_callback = function() {};
+
+    WorkerTestEnvironment.prototype.test_timeout = function() {
+        // Tests running in a worker don't have a default timeout. I.e. all
+        // worker tests behave as if settings.explicit_timeout is true.
+        return null;
+    };
+
+    /*
+     * Dedicated web workers.
+     * https://html.spec.whatwg.org/multipage/workers.html#dedicatedworkerglobalscope
+     *
+     * This class is used as the test_environment when testharness is running
+     * inside a dedicated worker.
+     */
+    function DedicatedWorkerTestEnvironment() {
+        WorkerTestEnvironment.call(this);
+        // self is an instance of DedicatedWorkerGlobalScope which exposes
+        // a postMessage() method for communicating via the message channel
+        // established when the worker is created.
+        this._add_message_port(self);
+    }
+    DedicatedWorkerTestEnvironment.prototype = Object.create(WorkerTestEnvironment.prototype);
+
+    DedicatedWorkerTestEnvironment.prototype.on_tests_ready = function() {
+        WorkerTestEnvironment.prototype.on_tests_ready.call(this);
+        // In the absence of an onload notification, we a require dedicated
+        // workers to explicitly signal when the tests are done.
+        tests.wait_for_finish = true;
+    };
+
+    /*
+     * Shared web workers.
+     * https://html.spec.whatwg.org/multipage/workers.html#sharedworkerglobalscope
+     *
+     * This class is used as the test_environment when testharness is running
+     * inside a shared web worker.
+     */
+    function SharedWorkerTestEnvironment() {
+        WorkerTestEnvironment.call(this);
+        var this_obj = this;
+        // Shared workers receive message ports via the 'onconnect' event for
+        // each connection.
+        self.addEventListener("connect",
+                function(message_event) {
+                    this_obj._add_message_port(message_event.source);
+                }, false);
+    }
+    SharedWorkerTestEnvironment.prototype = Object.create(WorkerTestEnvironment.prototype);
+
+    SharedWorkerTestEnvironment.prototype.on_tests_ready = function() {
+        WorkerTestEnvironment.prototype.on_tests_ready.call(this);
+        // In the absence of an onload notification, we a require shared
+        // workers to explicitly signal when the tests are done.
+        tests.wait_for_finish = true;
+    };
+
+    /*
+     * Service workers.
+     * http://www.w3.org/TR/service-workers/
+     *
+     * This class is used as the test_environment when testharness is running
+     * inside a service worker.
+     */
+    function ServiceWorkerTestEnvironment() {
+        WorkerTestEnvironment.call(this);
+        this.all_loaded = false;
+        this.on_loaded_callback = null;
+        var this_obj = this;
+        self.addEventListener("message",
+                function(event) {
+                    if (event.data && event.data.type && event.data.type === "connect") {
+                        this_obj._add_message_port(event.source);
+                    }
+                }, false);
+
+        // The oninstall event is received after the service worker script and
+        // all imported scripts have been fetched and executed. It's the
+        // equivalent of an onload event for a document. All tests should have
+        // been added by the time this event is received, thus it's not
+        // necessary to wait until the onactivate event. However, tests for
+        // installed service workers need another event which is equivalent to
+        // the onload event because oninstall is fired only on installation. The
+        // onmessage event is used for that purpose since tests using
+        // testharness.js should ask the result to its service worker by
+        // PostMessage. If the onmessage event is triggered on the service
+        // worker's context, that means the worker's script has been evaluated.
+        on_event(self, "install", on_all_loaded);
+        on_event(self, "message", on_all_loaded);
+        function on_all_loaded() {
+            if (this_obj.all_loaded)
+                return;
+            this_obj.all_loaded = true;
+            if (this_obj.on_loaded_callback) {
+              this_obj.on_loaded_callback();
+            }
+        }
+    }
+
+    ServiceWorkerTestEnvironment.prototype = Object.create(WorkerTestEnvironment.prototype);
+
+    ServiceWorkerTestEnvironment.prototype.add_on_loaded_callback = function(callback) {
+        if (this.all_loaded) {
+            callback();
+        } else {
+            this.on_loaded_callback = callback;
+        }
+    };
+
+    /*
+     * Shadow realms.
+     * https://github.com/tc39/proposal-shadowrealm
+     *
+     * This class is used as the test_environment when testharness is running
+     * inside a shadow realm.
+     */
+    function ShadowRealmTestEnvironment() {
+        WorkerTestEnvironment.call(this);
+        this.all_loaded = false;
+        this.on_loaded_callback = null;
+    }
+
+    ShadowRealmTestEnvironment.prototype = Object.create(WorkerTestEnvironment.prototype);
+
+    /**
+     * Signal to the test environment that the tests are ready and the on-loaded
+     * callback should be run.
+     *
+     * Shadow realms are not *really* a DOM context: they have no `onload` or similar
+     * event for us to use to set up the test environment; so, instead, this method
+     * is manually triggered from the incubating realm
+     *
+     * @param {Function} message_destination - a function that receives JSON-serializable
+     * data to send to the incubating realm, in the same format as used by RemoteContext
+     */
+    ShadowRealmTestEnvironment.prototype.begin = function(message_destination) {
+        if (this.all_loaded) {
+            throw new Error("Tried to start a shadow realm test environment after it has already started");
+        }
+        var fakeMessagePort = {};
+        fakeMessagePort.postMessage = message_destination;
+        this._add_message_port(fakeMessagePort);
+        this.all_loaded = true;
+        if (this.on_loaded_callback) {
+            this.on_loaded_callback();
+        }
+    };
+
+    ShadowRealmTestEnvironment.prototype.add_on_loaded_callback = function(callback) {
+        if (this.all_loaded) {
+            callback();
+        } else {
+            this.on_loaded_callback = callback;
+        }
+    };
+
+    /*
+     * JavaScript shells.
+     *
+     * This class is used as the test_environment when testharness is running
+     * inside a JavaScript shell.
+     */
+    function ShellTestEnvironment() {
+        this.name_counter = 0;
+        this.all_loaded = false;
+        this.on_loaded_callback = null;
+        Promise.resolve().then(function() {
+            this.all_loaded = true
+            if (this.on_loaded_callback) {
+                this.on_loaded_callback();
+            }
+        }.bind(this));
+        this.message_list = [];
+        this.message_ports = [];
+    }
+
+    ShellTestEnvironment.prototype.next_default_test_name = function() {
+        var suffix = this.name_counter > 0 ? " " + this.name_counter : "";
+        this.name_counter++;
+        return "Untitled" + suffix;
+    };
+
+    ShellTestEnvironment.prototype.on_new_harness_properties = function() {};
+
+    ShellTestEnvironment.prototype.on_tests_ready = function() {};
+
+    ShellTestEnvironment.prototype.add_on_loaded_callback = function(callback) {
+        if (this.all_loaded) {
+            callback();
+        } else {
+            this.on_loaded_callback = callback;
+        }
+    };
+
+    ShellTestEnvironment.prototype.test_timeout = function() {
+        // Tests running in a shell don't have a default timeout, so behave as
+        // if settings.explicit_timeout is true.
+        return null;
+    };
+
+    function create_test_environment() {
+        if ('document' in global_scope) {
+            return new WindowTestEnvironment();
+        }
+        if ('DedicatedWorkerGlobalScope' in global_scope &&
+            global_scope instanceof DedicatedWorkerGlobalScope) {
+            return new DedicatedWorkerTestEnvironment();
+        }
+        if ('SharedWorkerGlobalScope' in global_scope &&
+            global_scope instanceof SharedWorkerGlobalScope) {
+            return new SharedWorkerTestEnvironment();
+        }
+        if ('ServiceWorkerGlobalScope' in global_scope &&
+            global_scope instanceof ServiceWorkerGlobalScope) {
+            return new ServiceWorkerTestEnvironment();
+        }
+        if ('WorkerGlobalScope' in global_scope &&
+            global_scope instanceof WorkerGlobalScope) {
+            return new DedicatedWorkerTestEnvironment();
+        }
+        /* Shadow realm global objects are _ordinary_ objects (i.e. their prototype is
+         * Object) so we don't have a nice `instanceof` test to use; instead, we
+         * check if the there is a GLOBAL.isShadowRealm() property
+         * on the global object. that was set by the test harness when it
+         * created the ShadowRealm.
+         */
+        if (global_scope.GLOBAL && global_scope.GLOBAL.isShadowRealm()) {
+            return new ShadowRealmTestEnvironment();
+        }
+
+        return new ShellTestEnvironment();
+    }
+
+    var test_environment = create_test_environment();
+
+    function is_shared_worker(worker) {
+        return 'SharedWorker' in global_scope && worker instanceof SharedWorker;
+    }
+
+    function is_service_worker(worker) {
+        // The worker object may be from another execution context,
+        // so do not use instanceof here.
+        return 'ServiceWorker' in global_scope &&
+            Object.prototype.toString.call(worker) == '[object ServiceWorker]';
+    }
+
+    var seen_func_name = Object.create(null);
+
+    function get_test_name(func, name)
+    {
+        if (name) {
+            return name;
+        }
+
+        if (func) {
+            var func_code = func.toString();
+
+            // Try and match with brackets, but fallback to matching without
+            var arrow = func_code.match(/^\(\)\s*=>\s*(?:{(.*)}\s*|(.*))$/);
+
+            // Check for JS line separators
+            if (arrow !== null && !/[\u000A\u000D\u2028\u2029]/.test(func_code)) {
+                var trimmed = (arrow[1] !== undefined ? arrow[1] : arrow[2]).trim();
+                // drop trailing ; if there's no earlier ones
+                trimmed = trimmed.replace(/^([^;]*)(;\s*)+$/, "$1");
+
+                if (trimmed) {
+                    let name = trimmed;
+                    if (seen_func_name[trimmed]) {
+                        // This subtest name already exists, so add a suffix.
+                        name += " " + seen_func_name[trimmed];
+                    } else {
+                        seen_func_name[trimmed] = 0;
+                    }
+                    seen_func_name[trimmed] += 1;
+                    return name;
+                }
+            }
+        }
+
+        return test_environment.next_default_test_name();
+    }
+
+    /**
+     * @callback TestFunction
+     * @param {Test} test - The test currnetly being run.
+     * @param {Any[]} args - Additional args to pass to function.
+     *
+     */
+
+    /**
+     * Create a synchronous test
+     *
+     * @param {TestFunction} func - Test function. This is executed
+     * immediately. If it returns without error, the test status is
+     * set to ``PASS``. If it throws an :js:class:`AssertionError`, or
+     * any other exception, the test status is set to ``FAIL``
+     * (typically from an `assert` function).
+     * @param {String} name - Test name. This must be unique in a
+     * given file and must be invariant between runs.
+     */
+    function test(func, name, properties)
+    {
+        if (tests.promise_setup_called) {
+            tests.status.status = tests.status.ERROR;
+            tests.status.message = '`test` invoked after `promise_setup`';
+            tests.complete();
+        }
+        var test_name = get_test_name(func, name);
+        var test_obj = new Test(test_name, properties);
+        var value = test_obj.step(func, test_obj, test_obj);
+
+        if (value !== undefined) {
+            var msg = 'Test named "' + test_name +
+                '" passed a function to `test` that returned a value.';
+
+            try {
+                if (value && typeof value.then === 'function') {
+                    msg += ' Consider using `promise_test` instead when ' +
+                        'using Promises or async/await.';
+                }
+            } catch (err) {}
+
+            tests.status.status = tests.status.ERROR;
+            tests.status.message = msg;
+        }
+
+        if (test_obj.phase === test_obj.phases.STARTED) {
+            test_obj.done();
+        }
+    }
+
+    /**
+     * Create an asynchronous test
+     *
+     * @param {TestFunction|string} funcOrName - Initial step function
+     * to call immediately with the test name as an argument (if any),
+     * or name of the test.
+     * @param {String} name - Test name (if a test function was
+     * provided). This must be unique in a given file and must be
+     * invariant between runs.
+     * @returns {Test} An object representing the ongoing test.
+     */
+    function async_test(func, name, properties)
+    {
+        if (tests.promise_setup_called) {
+            tests.status.status = tests.status.ERROR;
+            tests.status.message = '`async_test` invoked after `promise_setup`';
+            tests.complete();
+        }
+        if (typeof func !== "function") {
+            properties = name;
+            name = func;
+            func = null;
+        }
+        var test_name = get_test_name(func, name);
+        var test_obj = new Test(test_name, properties);
+        if (func) {
+            var value = test_obj.step(func, test_obj, test_obj);
+
+            // Test authors sometimes return values to async_test, expecting us
+            // to handle the value somehow. Make doing so a harness error to be
+            // clear this is invalid, and point authors to promise_test if it
+            // may be appropriate.
+            //
+            // Note that we only perform this check on the initial function
+            // passed to async_test, not on any later steps - we haven't seen a
+            // consistent problem with those (and it's harder to check).
+            if (value !== undefined) {
+                var msg = 'Test named "' + test_name +
+                    '" passed a function to `async_test` that returned a value.';
+
+                try {
+                    if (value && typeof value.then === 'function') {
+                        msg += ' Consider using `promise_test` instead when ' +
+                            'using Promises or async/await.';
+                    }
+                } catch (err) {}
+
+                tests.set_status(tests.status.ERROR, msg);
+                tests.complete();
+            }
+        }
+        return test_obj;
+    }
+
+    /**
+     * Create a promise test.
+     *
+     * Promise tests are tests which are represented by a promise
+     * object. If the promise is fulfilled the test passes, if it's
+     * rejected the test fails, otherwise the test passes.
+     *
+     * @param {TestFunction} func - Test function. This must return a
+     * promise. The test is automatically marked as complete once the
+     * promise settles.
+     * @param {String} name - Test name. This must be unique in a
+     * given file and must be invariant between runs.
+     */
+    function promise_test(func, name, properties) {
+        if (typeof func !== "function") {
+            properties = name;
+            name = func;
+            func = null;
+        }
+        var test_name = get_test_name(func, name);
+        var test = new Test(test_name, properties);
+        test._is_promise_test = true;
+
+        // If there is no promise tests queue make one.
+        if (!tests.promise_tests) {
+            tests.promise_tests = Promise.resolve();
+        }
+        tests.promise_tests = tests.promise_tests.then(function() {
+            return new Promise(function(resolve) {
+                var promise = test.step(func, test, test);
+
+                test.step(function() {
+                    assert(!!promise, "promise_test", null,
+                           "test body must return a 'thenable' object (received ${value})",
+                           {value:promise});
+                    assert(typeof promise.then === "function", "promise_test", null,
+                           "test body must return a 'thenable' object (received an object with no `then` method)",
+                           null);
+                });
+
+                // Test authors may use the `step` method within a
+                // `promise_test` even though this reflects a mixture of
+                // asynchronous control flow paradigms. The "done" callback
+                // should be registered prior to the resolution of the
+                // user-provided Promise to avoid timeouts in cases where the
+                // Promise does not settle but a `step` function has thrown an
+                // error.
+                add_test_done_callback(test, resolve);
+
+                Promise.resolve(promise)
+                    .catch(test.step_func(
+                        function(value) {
+                            if (value instanceof AssertionError) {
+                                throw value;
+                            }
+                            assert(false, "promise_test", null,
+                                   "Unhandled rejection with value: ${value}", {value:value});
+                        }))
+                    .then(function() {
+                        test.done();
+                    });
+                });
+        });
+    }
+
+    /**
+     * Make a copy of a Promise in the current realm.
+     *
+     * @param {Promise} promise the given promise that may be from a different
+     *                          realm
+     * @returns {Promise}
+     *
+     * An arbitrary promise provided by the caller may have originated
+     * in another frame that have since navigated away, rendering the
+     * frame's document inactive. Such a promise cannot be used with
+     * `await` or Promise.resolve(), as microtasks associated with it
+     * may be prevented from being run. See `issue
+     * 5319<https://github.com/whatwg/html/issues/5319>`_ for a
+     * particular case.
+     *
+     * In functions we define here, there is an expectation from the caller
+     * that the promise is from the current realm, that can always be used with
+     * `await`, etc. We therefore create a new promise in this realm that
+     * inherit the value and status from the given promise.
+     */
+
+    function bring_promise_to_current_realm(promise) {
+        return new Promise(promise.then.bind(promise));
+    }
+
+    /**
+     * Assert that a Promise is rejected with the right ECMAScript exception.
+     *
+     * @param {Test} test - the `Test` to use for the assertion.
+     * @param {Function} constructor - The expected exception constructor.
+     * @param {Promise} promise - The promise that's expected to
+     * reject with the given exception.
+     * @param {string} [description] Error message to add to assert in case of
+     *                               failure.
+     */
+    function promise_rejects_js(test, constructor, promise, description) {
+        return bring_promise_to_current_realm(promise)
+            .then(test.unreached_func("Should have rejected: " + description))
+            .catch(function(e) {
+                assert_throws_js_impl(constructor, function() { throw e },
+                                      description, "promise_rejects_js");
+            });
+    }
+
+    /**
+     * Assert that a Promise is rejected with the right DOMException.
+     *
+     * For the remaining arguments, there are two ways of calling
+     * promise_rejects_dom:
+     *
+     * 1) If the DOMException is expected to come from the current global, the
+     * third argument should be the promise expected to reject, and a fourth,
+     * optional, argument is the assertion description.
+     *
+     * 2) If the DOMException is expected to come from some other global, the
+     * third argument should be the DOMException constructor from that global,
+     * the fourth argument the promise expected to reject, and the fifth,
+     * optional, argument the assertion description.
+     *
+     * @param {Test} test - the `Test` to use for the assertion.
+     * @param {number|string} type - See documentation for
+     * `assert_throws_dom <#assert_throws_dom>`_.
+     * @param {Function} promiseOrConstructor - Either the constructor
+     * for the expected exception (if the exception comes from another
+     * global), or the promise that's expected to reject (if the
+     * exception comes from the current global).
+     * @param {Function|string} descriptionOrPromise - Either the
+     * promise that's expected to reject (if the exception comes from
+     * another global), or the optional description of the condition
+     * being tested (if the exception comes from the current global).
+     * @param {string} [description] - Description of the condition
+     * being tested (if the exception comes from another global).
+     *
+     */
+    function promise_rejects_dom(test, type, promiseOrConstructor, descriptionOrPromise, maybeDescription) {
+        let constructor, promise, description;
+        if (typeof promiseOrConstructor === "function" &&
+            promiseOrConstructor.name === "DOMException") {
+            constructor = promiseOrConstructor;
+            promise = descriptionOrPromise;
+            description = maybeDescription;
+        } else {
+            constructor = self.DOMException;
+            promise = promiseOrConstructor;
+            description = descriptionOrPromise;
+            assert(maybeDescription === undefined,
+                   "Too many args pased to no-constructor version of promise_rejects_dom");
+        }
+        return bring_promise_to_current_realm(promise)
+            .then(test.unreached_func("Should have rejected: " + description))
+            .catch(function(e) {
+                assert_throws_dom_impl(type, function() { throw e }, description,
+                                       "promise_rejects_dom", constructor);
+            });
+    }
+
+    /**
+     * Assert that a Promise is rejected with the provided value.
+     *
+     * @param {Test} test - the `Test` to use for the assertion.
+     * @param {Any} exception - The expected value of the rejected promise.
+     * @param {Promise} promise - The promise that's expected to
+     * reject.
+     * @param {string} [description] Error message to add to assert in case of
+     *                               failure.
+     */
+    function promise_rejects_exactly(test, exception, promise, description) {
+        return bring_promise_to_current_realm(promise)
+            .then(test.unreached_func("Should have rejected: " + description))
+            .catch(function(e) {
+                assert_throws_exactly_impl(exception, function() { throw e },
+                                           description, "promise_rejects_exactly");
+            });
+    }
+
+    /**
+     * Allow DOM events to be handled using Promises.
+     *
+     * This can make it a lot easier to test a very specific series of events,
+     * including ensuring that unexpected events are not fired at any point.
+     *
+     * `EventWatcher` will assert if an event occurs while there is no `wait_for`
+     * created Promise waiting to be fulfilled, or if the event is of a different type
+     * to the type currently expected. This ensures that only the events that are
+     * expected occur, in the correct order, and with the correct timing.
+     *
+     * @constructor
+     * @param {Test} test - The `Test` to use for the assertion.
+     * @param {EventTarget} watchedNode - The target expected to receive the events.
+     * @param {string[]} eventTypes - List of events to watch for.
+     * @param {Promise} timeoutPromise - Promise that will cause the
+     * test to be set to `TIMEOUT` once fulfilled.
+     *
+     */
+    function EventWatcher(test, watchedNode, eventTypes, timeoutPromise)
+    {
+        if (typeof eventTypes == 'string') {
+            eventTypes = [eventTypes];
+        }
+
+        var waitingFor = null;
+
+        // This is null unless we are recording all events, in which case it
+        // will be an Array object.
+        var recordedEvents = null;
+
+        var eventHandler = test.step_func(function(evt) {
+            assert_true(!!waitingFor,
+                        'Not expecting event, but got ' + evt.type + ' event');
+            assert_equals(evt.type, waitingFor.types[0],
+                          'Expected ' + waitingFor.types[0] + ' event, but got ' +
+                          evt.type + ' event instead');
+
+            if (Array.isArray(recordedEvents)) {
+                recordedEvents.push(evt);
+            }
+
+            if (waitingFor.types.length > 1) {
+                // Pop first event from array
+                waitingFor.types.shift();
+                return;
+            }
+            // We need to null out waitingFor before calling the resolve function
+            // since the Promise's resolve handlers may call wait_for() which will
+            // need to set waitingFor.
+            var resolveFunc = waitingFor.resolve;
+            waitingFor = null;
+            // Likewise, we should reset the state of recordedEvents.
+            var result = recordedEvents || evt;
+            recordedEvents = null;
+            resolveFunc(result);
+        });
+
+        for (var i = 0; i < eventTypes.length; i++) {
+            watchedNode.addEventListener(eventTypes[i], eventHandler, false);
+        }
+
+        /**
+         * Returns a Promise that will resolve after the specified event or
+         * series of events has occurred.
+         *
+         * @param {Object} options An optional options object. If the 'record' property
+         *                 on this object has the value 'all', when the Promise
+         *                 returned by this function is resolved,  *all* Event
+         *                 objects that were waited for will be returned as an
+         *                 array.
+         *
+         * @example
+         * const watcher = new EventWatcher(t, div, [ 'animationstart',
+         *                                            'animationiteration',
+         *                                            'animationend' ]);
+         * return watcher.wait_for([ 'animationstart', 'animationend' ],
+         *                         { record: 'all' }).then(evts => {
+         *   assert_equals(evts[0].elapsedTime, 0.0);
+         *   assert_equals(evts[1].elapsedTime, 2.0);
+         * });
+         */
+        this.wait_for = function(types, options) {
+            if (waitingFor) {
+                return Promise.reject('Already waiting for an event or events');
+            }
+            if (typeof types == 'string') {
+                types = [types];
+            }
+            if (options && options.record && options.record === 'all') {
+                recordedEvents = [];
+            }
+            return new Promise(function(resolve, reject) {
+                var timeout = test.step_func(function() {
+                    // If the timeout fires after the events have been received
+                    // or during a subsequent call to wait_for, ignore it.
+                    if (!waitingFor || waitingFor.resolve !== resolve)
+                        return;
+
+                    // This should always fail, otherwise we should have
+                    // resolved the promise.
+                    assert_true(waitingFor.types.length == 0,
+                                'Timed out waiting for ' + waitingFor.types.join(', '));
+                    var result = recordedEvents;
+                    recordedEvents = null;
+                    var resolveFunc = waitingFor.resolve;
+                    waitingFor = null;
+                    resolveFunc(result);
+                });
+
+                if (timeoutPromise) {
+                    timeoutPromise().then(timeout);
+                }
+
+                waitingFor = {
+                    types: types,
+                    resolve: resolve,
+                    reject: reject
+                };
+            });
+        };
+
+        /**
+         * Stop listening for events
+         */
+        function stop_watching() {
+            for (var i = 0; i < eventTypes.length; i++) {
+                watchedNode.removeEventListener(eventTypes[i], eventHandler, false);
+            }
+        };
+
+        test._add_cleanup(stop_watching);
+
+        return this;
+    }
+    expose(EventWatcher, 'EventWatcher');
+
+    /**
+     * @typedef {Object} SettingsObject
+     * @property {bool} single_test - Use the single-page-test
+     * mode. In this mode the Document represents a single
+     * `async_test`. Asserts may be used directly without requiring
+     * `Test.step` or similar wrappers, and any exceptions set the
+     * status of the test rather than the status of the harness.
+     * @property {bool} allow_uncaught_exception - don't treat an
+     * uncaught exception as an error; needed when e.g. testing the
+     * `window.onerror` handler.
+     * @property {boolean} explicit_done - Wait for a call to `done()`
+     * before declaring all tests complete (this is always true for
+     * single-page tests).
+     * @property hide_test_state - hide the test state output while
+     * the test is running; This is helpful when the output of the test state
+     * may interfere the test results.
+     * @property {bool} explicit_timeout - disable file timeout; only
+     * stop waiting for results when the `timeout()` function is
+     * called This should typically only be set for manual tests, or
+     * by a test runner that providees its own timeout mechanism.
+     * @property {number} timeout_multiplier - Multiplier to apply to
+     * per-test timeouts. This should only be set by a test runner.
+     * @property {Document} output_document - The document to which
+     * results should be logged. By default this is the current
+     * document but could be an ancestor document in some cases e.g. a
+     * SVG test loaded in an HTML wrapper
+     *
+     */
+
+    /**
+     * Configure the harness
+     *
+     * @param {Function|SettingsObject} funcOrProperties - Either a
+     * setup function to run, or a set of properties. If this is a
+     * function that function is run synchronously. Any exception in
+     * the function will set the overall harness status to `ERROR`.
+     * @param {SettingsObject} maybeProperties - An object containing
+     * the settings to use, if the first argument is a function.
+     *
+     */
+    function setup(func_or_properties, maybe_properties)
+    {
+        var func = null;
+        var properties = {};
+        if (arguments.length === 2) {
+            func = func_or_properties;
+            properties = maybe_properties;
+        } else if (func_or_properties instanceof Function) {
+            func = func_or_properties;
+        } else {
+            properties = func_or_properties;
+        }
+        tests.setup(func, properties);
+        test_environment.on_new_harness_properties(properties);
+    }
+
+    /**
+     * Configure the harness, waiting for a promise to resolve
+     * before running any `promise_test` tests.
+     *
+     * @param {Function} func - Function returning a promise that's
+     * run synchronously. Promise tests are not run until after this
+     * function has resolved.
+     * @param {SettingsObject} [properties] - An object containing
+     * the harness settings to use.
+     *
+     */
+    function promise_setup(func, properties={})
+    {
+        if (typeof func !== "function") {
+            tests.set_status(tests.status.ERROR,
+                             "promise_test invoked without a function");
+            tests.complete();
+            return;
+        }
+        tests.promise_setup_called = true;
+
+        if (!tests.promise_tests) {
+            tests.promise_tests = Promise.resolve();
+        }
+
+        tests.promise_tests = tests.promise_tests
+            .then(function()
+                  {
+                      var result;
+
+                      tests.setup(null, properties);
+                      result = func();
+                      test_environment.on_new_harness_properties(properties);
+
+                      if (!result || typeof result.then !== "function") {
+                          throw "Non-thenable returned by function passed to `promise_setup`";
+                      }
+                      return result;
+                  })
+            .catch(function(e)
+                   {
+                       tests.set_status(tests.status.ERROR,
+                                        String(e),
+                                        e && e.stack);
+                       tests.complete();
+                   });
+    }
+
+    /**
+     * Mark test loading as complete.
+     *
+     * Typically this function is called implicitly on page load; it's
+     * only necessary for users to call this when either the
+     * ``explicit_done`` or ``single_page`` properties have been set
+     * via the :js:func:`setup` function.
+     *
+     * For single page tests this marks the test as complete and sets its status.
+     * For other tests, this marks test loading as complete, but doesn't affect ongoing tests.
+     */
+    function done() {
+        if (tests.tests.length === 0) {
+            // `done` is invoked after handling uncaught exceptions, so if the
+            // harness status is already set, the corresponding message is more
+            // descriptive than the generic message defined here.
+            if (tests.status.status === null) {
+                tests.status.status = tests.status.ERROR;
+                tests.status.message = "done() was called without first defining any tests";
+            }
+
+            tests.complete();
+            return;
+        }
+        if (tests.file_is_test) {
+            // file is test files never have asynchronous cleanup logic,
+            // meaning the fully-synchronous `done` function can be used here.
+            tests.tests[0].done();
+        }
+        tests.end_wait();
+    }
+
+    /**
+     * @deprecated generate a list of tests from a function and list of arguments
+     *
+     * This is deprecated because it runs all the tests outside of the test functions
+     * and as a result any test throwing an exception will result in no tests being
+     * run. In almost all cases, you should simply call test within the loop you would
+     * use to generate the parameter list array.
+     *
+     * @param {Function} func - The function that will be called for each generated tests.
+     * @param {Any[][]} args - An array of arrays. Each nested array
+     * has the structure `[testName, ...testArgs]`. For each of these nested arrays
+     * array, a test is generated with name `testName` and test function equivalent to
+     * `func(..testArgs)`.
+     */
+    function generate_tests(func, args, properties) {
+        forEach(args, function(x, i)
+                {
+                    var name = x[0];
+                    test(function()
+                         {
+                             func.apply(this, x.slice(1));
+                         },
+                         name,
+                         Array.isArray(properties) ? properties[i] : properties);
+                });
+    }
+
+    /**
+     * @deprecated
+     *
+     * Register a function as a DOM event listener to the
+     * given object for the event bubbling phase.
+     *
+     * @param {EventTarget} object - Event target
+     * @param {string} event - Event name
+     * @param {Function} callback - Event handler.
+     */
+    function on_event(object, event, callback)
+    {
+        object.addEventListener(event, callback, false);
+    }
+
+    /**
+     * Global version of :js:func:`Test.step_timeout` for use in single page tests.
+     *
+     * @param {Function} func - Function to run after the timeout
+     * @param {number} timeout - Time in ms to wait before running the
+     * test step. The actual wait time is ``timeout`` x
+     * ``timeout_multiplier``.
+     */
+    function step_timeout(func, timeout) {
+        var outer_this = this;
+        var args = Array.prototype.slice.call(arguments, 2);
+        return setTimeout(function() {
+            func.apply(outer_this, args);
+        }, timeout * tests.timeout_multiplier);
+    }
+
+    expose(test, 'test');
+    expose(async_test, 'async_test');
+    expose(promise_test, 'promise_test');
+    expose(promise_rejects_js, 'promise_rejects_js');
+    expose(promise_rejects_dom, 'promise_rejects_dom');
+    expose(promise_rejects_exactly, 'promise_rejects_exactly');
+    expose(generate_tests, 'generate_tests');
+    expose(setup, 'setup');
+    expose(promise_setup, 'promise_setup');
+    expose(done, 'done');
+    expose(on_event, 'on_event');
+    expose(step_timeout, 'step_timeout');
+
+    /*
+     * Return a string truncated to the given length, with ... added at the end
+     * if it was longer.
+     */
+    function truncate(s, len)
+    {
+        if (s.length > len) {
+            return s.substring(0, len - 3) + "...";
+        }
+        return s;
+    }
+
+    /*
+     * Return true if object is probably a Node object.
+     */
+    function is_node(object)
+    {
+        // I use duck-typing instead of instanceof, because
+        // instanceof doesn't work if the node is from another window (like an
+        // iframe's contentWindow):
+        // http://www.w3.org/Bugs/Public/show_bug.cgi?id=12295
+        try {
+            var has_node_properties = ("nodeType" in object &&
+                                       "nodeName" in object &&
+                                       "nodeValue" in object &&
+                                       "childNodes" in object);
+        } catch (e) {
+            // We're probably cross-origin, which means we aren't a node
+            return false;
+        }
+
+        if (has_node_properties) {
+            try {
+                object.nodeType;
+            } catch (e) {
+                // The object is probably Node.prototype or another prototype
+                // object that inherits from it, and not a Node instance.
+                return false;
+            }
+            return true;
+        }
+        return false;
+    }
+
+    var replacements = {
+        "0": "0",
+        "1": "x01",
+        "2": "x02",
+        "3": "x03",
+        "4": "x04",
+        "5": "x05",
+        "6": "x06",
+        "7": "x07",
+        "8": "b",
+        "9": "t",
+        "10": "n",
+        "11": "v",
+        "12": "f",
+        "13": "r",
+        "14": "x0e",
+        "15": "x0f",
+        "16": "x10",
+        "17": "x11",
+        "18": "x12",
+        "19": "x13",
+        "20": "x14",
+        "21": "x15",
+        "22": "x16",
+        "23": "x17",
+        "24": "x18",
+        "25": "x19",
+        "26": "x1a",
+        "27": "x1b",
+        "28": "x1c",
+        "29": "x1d",
+        "30": "x1e",
+        "31": "x1f",
+        "0xfffd": "ufffd",
+        "0xfffe": "ufffe",
+        "0xffff": "uffff",
+    };
+
+    /**
+     * Convert a value to a nice, human-readable string
+     *
+     * When many JavaScript Object values are coerced to a String, the
+     * resulting value will be ``"[object Object]"``. This obscures
+     * helpful information, making the coerced value unsuitable for
+     * use in assertion messages, test names, and debugging
+     * statements. `format_value` produces more distinctive string
+     * representations of many kinds of objects, including arrays and
+     * the more important DOM Node types. It also translates String
+     * values containing control characters to include human-readable
+     * representations.
+     *
+     * @example
+     * // "Document node with 2 children"
+     * format_value(document);
+     * @example
+     * // "\"foo\\uffffbar\""
+     * format_value("foo\uffffbar");
+     * @example
+     * // "[-0, Infinity]"
+     * format_value([-0, Infinity]);
+     * @param {Any} val - The value to convert to a string.
+     * @returns {string} - A string representation of ``val``, optimised for human readability.
+     */
+    function format_value(val, seen)
+    {
+        if (!seen) {
+            seen = [];
+        }
+        if (typeof val === "object" && val !== null) {
+            if (seen.indexOf(val) >= 0) {
+                return "[...]";
+            }
+            seen.push(val);
+        }
+        if (Array.isArray(val)) {
+            let output = "[";
+            if (val.beginEllipsis !== undefined) {
+                output += "…, ";
+            }
+            output += val.map(function(x) {return format_value(x, seen);}).join(", ");
+            if (val.endEllipsis !== undefined) {
+                output += ", …";
+            }
+            return output + "]";
+        }
+
+        switch (typeof val) {
+        case "string":
+            val = val.replace(/\\/g, "\\\\");
+            for (var p in replacements) {
+                var replace = "\\" + replacements[p];
+                val = val.replace(RegExp(String.fromCharCode(p), "g"), replace);
+            }
+            return '"' + val.replace(/"/g, '\\"') + '"';
+        case "boolean":
+        case "undefined":
+            return String(val);
+        case "number":
+            // In JavaScript, -0 === 0 and String(-0) == "0", so we have to
+            // special-case.
+            if (val === -0 && 1/val === -Infinity) {
+                return "-0";
+            }
+            return String(val);
+        case "object":
+            if (val === null) {
+                return "null";
+            }
+
+            // Special-case Node objects, since those come up a lot in my tests.  I
+            // ignore namespaces.
+            if (is_node(val)) {
+                switch (val.nodeType) {
+                case Node.ELEMENT_NODE:
+                    var ret = "<" + val.localName;
+                    for (var i = 0; i < val.attributes.length; i++) {
+                        ret += " " + val.attributes[i].name + '="' + val.attributes[i].value + '"';
+                    }
+                    ret += ">" + val.innerHTML + "</" + val.localName + ">";
+                    return "Element node " + truncate(ret, 60);
+                case Node.TEXT_NODE:
+                    return 'Text node "' + truncate(val.data, 60) + '"';
+                case Node.PROCESSING_INSTRUCTION_NODE:
+                    return "ProcessingInstruction node with target " + format_value(truncate(val.target, 60)) + " and data " + format_value(truncate(val.data, 60));
+                case Node.COMMENT_NODE:
+                    return "Comment node <!--" + truncate(val.data, 60) + "-->";
+                case Node.DOCUMENT_NODE:
+                    return "Document node with " + val.childNodes.length + (val.childNodes.length == 1 ? " child" : " children");
+                case Node.DOCUMENT_TYPE_NODE:
+                    return "DocumentType node";
+                case Node.DOCUMENT_FRAGMENT_NODE:
+                    return "DocumentFragment node with " + val.childNodes.length + (val.childNodes.length == 1 ? " child" : " children");
+                default:
+                    return "Node object of unknown type";
+                }
+            }
+
+        /* falls through */
+        default:
+            try {
+                return typeof val + ' "' + truncate(String(val), 1000) + '"';
+            } catch(e) {
+                return ("[stringifying object threw " + String(e) +
+                        " with type " + String(typeof e) + "]");
+            }
+        }
+    }
+    expose(format_value, "format_value");
+
+    /*
+     * Assertions
+     */
+
+    function expose_assert(f, name) {
+        function assert_wrapper(...args) {
+            let status = Test.statuses.TIMEOUT;
+            let stack = null;
+            try {
+                if (settings.debug) {
+                    console.debug("ASSERT", name, tests.current_test && tests.current_test.name, args);
+                }
+                if (tests.output) {
+                    tests.set_assert(name, args);
+                }
+                const rv = f.apply(undefined, args);
+                status = Test.statuses.PASS;
+                return rv;
+            } catch(e) {
+                status = Test.statuses.FAIL;
+                stack = e.stack ? e.stack : null;
+                throw e;
+            } finally {
+                if (tests.output && !stack) {
+                    stack = get_stack();
+                }
+                if (tests.output) {
+                    tests.set_assert_status(status, stack);
+                }
+            }
+        }
+        expose(assert_wrapper, name);
+    }
+
+    /**
+     * Assert that ``actual`` is strictly true
+     *
+     * @param {Any} actual - Value that is asserted to be true
+     * @param {string} [description] - Description of the condition being tested
+     */
+    function assert_true(actual, description)
+    {
+        assert(actual === true, "assert_true", description,
+                                "expected true got ${actual}", {actual:actual});
+    }
+    expose_assert(assert_true, "assert_true");
+
+    /**
+     * Assert that ``actual`` is strictly false
+     *
+     * @param {Any} actual - Value that is asserted to be false
+     * @param {string} [description] - Description of the condition being tested
+     */
+    function assert_false(actual, description)
+    {
+        assert(actual === false, "assert_false", description,
+                                 "expected false got ${actual}", {actual:actual});
+    }
+    expose_assert(assert_false, "assert_false");
+
+    function same_value(x, y) {
+        if (y !== y) {
+            //NaN case
+            return x !== x;
+        }
+        if (x === 0 && y === 0) {
+            //Distinguish +0 and -0
+            return 1/x === 1/y;
+        }
+        return x === y;
+    }
+
+    /**
+     * Assert that ``actual`` is the same value as ``expected``.
+     *
+     * For objects this compares by cobject identity; for primitives
+     * this distinguishes between 0 and -0, and has correct handling
+     * of NaN.
+     *
+     * @param {Any} actual - Test value.
+     * @param {Any} expected - Expected value.
+     * @param {string} [description] - Description of the condition being tested.
+     */
+    function assert_equals(actual, expected, description)
+    {
+         /*
+          * Test if two primitives are equal or two objects
+          * are the same object
+          */
+        if (typeof actual != typeof expected) {
+            assert(false, "assert_equals", description,
+                          "expected (" + typeof expected + ") ${expected} but got (" + typeof actual + ") ${actual}",
+                          {expected:expected, actual:actual});
+            return;
+        }
+        assert(same_value(actual, expected), "assert_equals", description,
+                                             "expected ${expected} but got ${actual}",
+                                             {expected:expected, actual:actual});
+    }
+    expose_assert(assert_equals, "assert_equals");
+
+    /**
+     * Assert that ``actual`` is not the same value as ``expected``.
+     *
+     * Comparison is as for :js:func:`assert_equals`.
+     *
+     * @param {Any} actual - Test value.
+     * @param {Any} expected - The value ``actual`` is expected to be different to.
+     * @param {string} [description] - Description of the condition being tested.
+     */
+    function assert_not_equals(actual, expected, description)
+    {
+        assert(!same_value(actual, expected), "assert_not_equals", description,
+                                              "got disallowed value ${actual}",
+                                              {actual:actual});
+    }
+    expose_assert(assert_not_equals, "assert_not_equals");
+
+    /**
+     * Assert that ``expected`` is an array and ``actual`` is one of the members.
+     * This is implemented using ``indexOf``, so doesn't handle NaN or ±0 correctly.
+     *
+     * @param {Any} actual - Test value.
+     * @param {Array} expected - An array that ``actual`` is expected to
+     * be a member of.
+     * @param {string} [description] - Description of the condition being tested.
+     */
+    function assert_in_array(actual, expected, description)
+    {
+        assert(expected.indexOf(actual) != -1, "assert_in_array", description,
+                                               "value ${actual} not in array ${expected}",
+                                               {actual:actual, expected:expected});
+    }
+    expose_assert(assert_in_array, "assert_in_array");
+
+    // This function was deprecated in July of 2015.
+    // See https://github.com/web-platform-tests/wpt/issues/2033
+    /**
+     * @deprecated
+     * Recursively compare two objects for equality.
+     *
+     * See `Issue 2033
+     * <https://github.com/web-platform-tests/wpt/issues/2033>`_ for
+     * more information.
+     *
+     * @param {Object} actual - Test value.
+     * @param {Object} expected - Expected value.
+     * @param {string} [description] - Description of the condition being tested.
+     */
+    function assert_object_equals(actual, expected, description)
+    {
+         assert(typeof actual === "object" && actual !== null, "assert_object_equals", description,
+                                                               "value is ${actual}, expected object",
+                                                               {actual: actual});
+         //This needs to be improved a great deal
+         function check_equal(actual, expected, stack)
+         {
+             stack.push(actual);
+
+             var p;
+             for (p in actual) {
+                 assert(expected.hasOwnProperty(p), "assert_object_equals", description,
+                                                    "unexpected property ${p}", {p:p});
+
+                 if (typeof actual[p] === "object" && actual[p] !== null) {
+                     if (stack.indexOf(actual[p]) === -1) {
+                         check_equal(actual[p], expected[p], stack);
+                     }
+                 } else {
+                     assert(same_value(actual[p], expected[p]), "assert_object_equals", description,
+                                                       "property ${p} expected ${expected} got ${actual}",
+                                                       {p:p, expected:expected[p], actual:actual[p]});
+                 }
+             }
+             for (p in expected) {
+                 assert(actual.hasOwnProperty(p),
+                        "assert_object_equals", description,
+                        "expected property ${p} missing", {p:p});
+             }
+             stack.pop();
+         }
+         check_equal(actual, expected, []);
+    }
+    expose_assert(assert_object_equals, "assert_object_equals");
+
+    /**
+     * Assert that ``actual`` and ``expected`` are both arrays, and that the array properties of
+     * ``actual`` and ``expected`` are all the same value (as for :js:func:`assert_equals`).
+     *
+     * @param {Array} actual - Test array.
+     * @param {Array} expected - Array that is expected to contain the same values as ``actual``.
+     * @param {string} [description] - Description of the condition being tested.
+     */
+    function assert_array_equals(actual, expected, description)
+    {
+        const max_array_length = 20;
+        function shorten_array(arr, offset = 0) {
+            // Make ", …" only show up when it would likely reduce the length, not accounting for
+            // fonts.
+            if (arr.length < max_array_length + 2) {
+                return arr;
+            }
+            // By default we want half the elements after the offset and half before
+            // But if that takes us past the end of the array, we have more before, and
+            // if it takes us before the start we have more after.
+            const length_after_offset = Math.floor(max_array_length / 2);
+            let upper_bound = Math.min(length_after_offset + offset, arr.length);
+            const lower_bound = Math.max(upper_bound - max_array_length, 0);
+
+            if (lower_bound === 0) {
+                upper_bound = max_array_length;
+            }
+
+            const output = arr.slice(lower_bound, upper_bound);
+            if (lower_bound > 0) {
+                output.beginEllipsis = true;
+            }
+            if (upper_bound < arr.length) {
+                output.endEllipsis = true;
+            }
+            return output;
+        }
+
+        assert(typeof actual === "object" && actual !== null && "length" in actual,
+               "assert_array_equals", description,
+               "value is ${actual}, expected array",
+               {actual:actual});
+        assert(actual.length === expected.length,
+               "assert_array_equals", description,
+               "lengths differ, expected array ${expected} length ${expectedLength}, got ${actual} length ${actualLength}",
+               {expected:shorten_array(expected, expected.length - 1), expectedLength:expected.length,
+                actual:shorten_array(actual, actual.length - 1), actualLength:actual.length
+               });
+
+        for (var i = 0; i < actual.length; i++) {
+            assert(actual.hasOwnProperty(i) === expected.hasOwnProperty(i),
+                   "assert_array_equals", description,
+                   "expected property ${i} to be ${expected} but was ${actual} (expected array ${arrayExpected} got ${arrayActual})",
+                   {i:i, expected:expected.hasOwnProperty(i) ? "present" : "missing",
+                    actual:actual.hasOwnProperty(i) ? "present" : "missing",
+                    arrayExpected:shorten_array(expected, i), arrayActual:shorten_array(actual, i)});
+            assert(same_value(expected[i], actual[i]),
+                   "assert_array_equals", description,
+                   "expected property ${i} to be ${expected} but got ${actual} (expected array ${arrayExpected} got ${arrayActual})",
+                   {i:i, expected:expected[i], actual:actual[i],
+                    arrayExpected:shorten_array(expected, i), arrayActual:shorten_array(actual, i)});
+        }
+    }
+    expose_assert(assert_array_equals, "assert_array_equals");
+
+    /**
+     * Assert that each array property in ``actual`` is a number within
+     * ± `epsilon` of the corresponding property in `expected`.
+     *
+     * @param {Array} actual - Array of test values.
+     * @param {Array} expected - Array of values expected to be close to the values in ``actual``.
+     * @param {number} epsilon - Magnitude of allowed difference
+     * between each value in ``actual`` and ``expected``.
+     * @param {string} [description] - Description of the condition being tested.
+     */
+    function assert_array_approx_equals(actual, expected, epsilon, description)
+    {
+        /*
+         * Test if two primitive arrays are equal within +/- epsilon
+         */
+        assert(actual.length === expected.length,
+               "assert_array_approx_equals", description,
+               "lengths differ, expected ${expected} got ${actual}",
+               {expected:expected.length, actual:actual.length});
+
+        for (var i = 0; i < actual.length; i++) {
+            assert(actual.hasOwnProperty(i) === expected.hasOwnProperty(i),
+                   "assert_array_approx_equals", description,
+                   "property ${i}, property expected to be ${expected} but was ${actual}",
+                   {i:i, expected:expected.hasOwnProperty(i) ? "present" : "missing",
+                    actual:actual.hasOwnProperty(i) ? "present" : "missing"});
+            assert(typeof actual[i] === "number",
+                   "assert_array_approx_equals", description,
+                   "property ${i}, expected a number but got a ${type_actual}",
+                   {i:i, type_actual:typeof actual[i]});
+            assert(Math.abs(actual[i] - expected[i]) <= epsilon,
+                   "assert_array_approx_equals", description,
+                   "property ${i}, expected ${expected} +/- ${epsilon}, expected ${expected} but got ${actual}",
+                   {i:i, expected:expected[i], actual:actual[i], epsilon:epsilon});
+        }
+    }
+    expose_assert(assert_array_approx_equals, "assert_array_approx_equals");
+
+    /**
+     * Assert that ``actual`` is within ± ``epsilon`` of ``expected``.
+     *
+     * @param {number} actual - Test value.
+     * @param {number} expected - Value number is expected to be close to.
+     * @param {number} epsilon - Magnitude of allowed difference between ``actual`` and ``expected``.
+     * @param {string} [description] - Description of the condition being tested.
+     */
+    function assert_approx_equals(actual, expected, epsilon, description)
+    {
+        /*
+         * Test if two primitive numbers are equal within +/- epsilon
+         */
+        assert(typeof actual === "number",
+               "assert_approx_equals", description,
+               "expected a number but got a ${type_actual}",
+               {type_actual:typeof actual});
+
+        // The epsilon math below does not place nice with NaN and Infinity
+        // But in this case Infinity = Infinity and NaN = NaN
+        if (isFinite(actual) || isFinite(expected)) {
+            assert(Math.abs(actual - expected) <= epsilon,
+                   "assert_approx_equals", description,
+                   "expected ${expected} +/- ${epsilon} but got ${actual}",
+                   {expected:expected, actual:actual, epsilon:epsilon});
+        } else {
+            assert_equals(actual, expected);
+        }
+    }
+    expose_assert(assert_approx_equals, "assert_approx_equals");
+
+    /**
+     * Assert that ``actual`` is a number less than ``expected``.
+     *
+     * @param {number} actual - Test value.
+     * @param {number} expected - Number that ``actual`` must be less than.
+     * @param {string} [description] - Description of the condition being tested.
+     */
+    function assert_less_than(actual, expected, description)
+    {
+        /*
+         * Test if a primitive number is less than another
+         */
+        assert(typeof actual === "number",
+               "assert_less_than", description,
+               "expected a number but got a ${type_actual}",
+               {type_actual:typeof actual});
+
+        assert(actual < expected,
+               "assert_less_than", description,
+               "expected a number less than ${expected} but got ${actual}",
+               {expected:expected, actual:actual});
+    }
+    expose_assert(assert_less_than, "assert_less_than");
+
+    /**
+     * Assert that ``actual`` is a number greater than ``expected``.
+     *
+     * @param {number} actual - Test value.
+     * @param {number} expected - Number that ``actual`` must be greater than.
+     * @param {string} [description] - Description of the condition being tested.
+     */
+    function assert_greater_than(actual, expected, description)
+    {
+        /*
+         * Test if a primitive number is greater than another
+         */
+        assert(typeof actual === "number",
+               "assert_greater_than", description,
+               "expected a number but got a ${type_actual}",
+               {type_actual:typeof actual});
+
+        assert(actual > expected,
+               "assert_greater_than", description,
+               "expected a number greater than ${expected} but got ${actual}",
+               {expected:expected, actual:actual});
+    }
+    expose_assert(assert_greater_than, "assert_greater_than");
+
+    /**
+     * Assert that ``actual`` is a number greater than ``lower`` and less
+     * than ``upper`` but not equal to either.
+     *
+     * @param {number} actual - Test value.
+     * @param {number} lower - Number that ``actual`` must be greater than.
+     * @param {number} upper - Number that ``actual`` must be less than.
+     * @param {string} [description] - Description of the condition being tested.
+     */
+    function assert_between_exclusive(actual, lower, upper, description)
+    {
+        /*
+         * Test if a primitive number is between two others
+         */
+        assert(typeof actual === "number",
+               "assert_between_exclusive", description,
+               "expected a number but got a ${type_actual}",
+               {type_actual:typeof actual});
+
+        assert(actual > lower && actual < upper,
+               "assert_between_exclusive", description,
+               "expected a number greater than ${lower} " +
+               "and less than ${upper} but got ${actual}",
+               {lower:lower, upper:upper, actual:actual});
+    }
+    expose_assert(assert_between_exclusive, "assert_between_exclusive");
+
+    /**
+     * Assert that ``actual`` is a number less than or equal to ``expected``.
+     *
+     * @param {number} actual - Test value.
+     * @param {number} expected - Number that ``actual`` must be less
+     * than or equal to.
+     * @param {string} [description] - Description of the condition being tested.
+     */
+    function assert_less_than_equal(actual, expected, description)
+    {
+        /*
+         * Test if a primitive number is less than or equal to another
+         */
+        assert(typeof actual === "number",
+               "assert_less_than_equal", description,
+               "expected a number but got a ${type_actual}",
+               {type_actual:typeof actual});
+
+        assert(actual <= expected,
+               "assert_less_than_equal", description,
+               "expected a number less than or equal to ${expected} but got ${actual}",
+               {expected:expected, actual:actual});
+    }
+    expose_assert(assert_less_than_equal, "assert_less_than_equal");
+
+    /**
+     * Assert that ``actual`` is a number greater than or equal to ``expected``.
+     *
+     * @param {number} actual - Test value.
+     * @param {number} expected - Number that ``actual`` must be greater
+     * than or equal to.
+     * @param {string} [description] - Description of the condition being tested.
+     */
+    function assert_greater_than_equal(actual, expected, description)
+    {
+        /*
+         * Test if a primitive number is greater than or equal to another
+         */
+        assert(typeof actual === "number",
+               "assert_greater_than_equal", description,
+               "expected a number but got a ${type_actual}",
+               {type_actual:typeof actual});
+
+        assert(actual >= expected,
+               "assert_greater_than_equal", description,
+               "expected a number greater than or equal to ${expected} but got ${actual}",
+               {expected:expected, actual:actual});
+    }
+    expose_assert(assert_greater_than_equal, "assert_greater_than_equal");
+
+    /**
+     * Assert that ``actual`` is a number greater than or equal to ``lower`` and less
+     * than or equal to ``upper``.
+     *
+     * @param {number} actual - Test value.
+     * @param {number} lower - Number that ``actual`` must be greater than or equal to.
+     * @param {number} upper - Number that ``actual`` must be less than or equal to.
+     * @param {string} [description] - Description of the condition being tested.
+     */
+    function assert_between_inclusive(actual, lower, upper, description)
+    {
+        /*
+         * Test if a primitive number is between to two others or equal to either of them
+         */
+        assert(typeof actual === "number",
+               "assert_between_inclusive", description,
+               "expected a number but got a ${type_actual}",
+               {type_actual:typeof actual});
+
+        assert(actual >= lower && actual <= upper,
+               "assert_between_inclusive", description,
+               "expected a number greater than or equal to ${lower} " +
+               "and less than or equal to ${upper} but got ${actual}",
+               {lower:lower, upper:upper, actual:actual});
+    }
+    expose_assert(assert_between_inclusive, "assert_between_inclusive");
+
+    /**
+     * Assert that ``actual`` matches the RegExp ``expected``.
+     *
+     * @param {String} actual - Test string.
+     * @param {RegExp} expected - RegExp ``actual`` must match.
+     * @param {string} [description] - Description of the condition being tested.
+     */
+    function assert_regexp_match(actual, expected, description) {
+        /*
+         * Test if a string (actual) matches a regexp (expected)
+         */
+        assert(expected.test(actual),
+               "assert_regexp_match", description,
+               "expected ${expected} but got ${actual}",
+               {expected:expected, actual:actual});
+    }
+    expose_assert(assert_regexp_match, "assert_regexp_match");
+
+    /**
+     * Assert that the class string of ``object`` as returned in
+     * ``Object.prototype.toString`` is equal to ``class_name``.
+     *
+     * @param {Object} object - Object to stringify.
+     * @param {string} class_string - Expected class string for ``object``.
+     * @param {string} [description] - Description of the condition being tested.
+     */
+    function assert_class_string(object, class_string, description) {
+        var actual = {}.toString.call(object);
+        var expected = "[object " + class_string + "]";
+        assert(same_value(actual, expected), "assert_class_string", description,
+                                             "expected ${expected} but got ${actual}",
+                                             {expected:expected, actual:actual});
+    }
+    expose_assert(assert_class_string, "assert_class_string");
+
+    /**
+     * Assert that ``object`` has an own property with name ``property_name``.
+     *
+     * @param {Object} object - Object that should have the given property.
+     * @param {string} property_name - Expected property name.
+     * @param {string} [description] - Description of the condition being tested.
+     */
+    function assert_own_property(object, property_name, description) {
+        assert(object.hasOwnProperty(property_name),
+               "assert_own_property", description,
+               "expected property ${p} missing", {p:property_name});
+    }
+    expose_assert(assert_own_property, "assert_own_property");
+
+    /**
+     * Assert that ``object`` does not have an own property with name ``property_name``.
+     *
+     * @param {Object} object - Object that should not have the given property.
+     * @param {string} property_name - Property name to test.
+     * @param {string} [description] - Description of the condition being tested.
+     */
+    function assert_not_own_property(object, property_name, description) {
+        assert(!object.hasOwnProperty(property_name),
+               "assert_not_own_property", description,
+               "unexpected property ${p} is found on object", {p:property_name});
+    }
+    expose_assert(assert_not_own_property, "assert_not_own_property");
+
+    function _assert_inherits(name) {
+        return function (object, property_name, description)
+        {
+            assert((typeof object === "object" && object !== null) ||
+                   typeof object === "function" ||
+                   // Or has [[IsHTMLDDA]] slot
+                   String(object) === "[object HTMLAllCollection]",
+                   name, description,
+                   "provided value is not an object");
+
+            assert("hasOwnProperty" in object,
+                   name, description,
+                   "provided value is an object but has no hasOwnProperty method");
+
+            assert(!object.hasOwnProperty(property_name),
+                   name, description,
+                   "property ${p} found on object expected in prototype chain",
+                   {p:property_name});
+
+            assert(property_name in object,
+                   name, description,
+                   "property ${p} not found in prototype chain",
+                   {p:property_name});
+        };
+    }
+
+    /**
+     * Assert that ``object`` does not have an own property with name
+     * ``property_name``, but inherits one through the prototype chain.
+     *
+     * @param {Object} object - Object that should have the given property in its prototype chain.
+     * @param {string} property_name - Expected property name.
+     * @param {string} [description] - Description of the condition being tested.
+     */
+    function assert_inherits(object, property_name, description) {
+        return _assert_inherits("assert_inherits")(object, property_name, description);
+    }
+    expose_assert(assert_inherits, "assert_inherits");
+
+    /**
+     * Alias for :js:func:`insert_inherits`.
+     *
+     * @param {Object} object - Object that should have the given property in its prototype chain.
+     * @param {string} property_name - Expected property name.
+     * @param {string} [description] - Description of the condition being tested.
+     */
+    function assert_idl_attribute(object, property_name, description) {
+        return _assert_inherits("assert_idl_attribute")(object, property_name, description);
+    }
+    expose_assert(assert_idl_attribute, "assert_idl_attribute");
+
+
+    /**
+     * Assert that ``object`` has a property named ``property_name`` and that the property is readonly.
+     *
+     * Note: The implementation tries to update the named property, so
+     * any side effects of updating will be triggered. Users are
+     * encouraged to instead inspect the property descriptor of ``property_name`` on ``object``.
+     *
+     * @param {Object} object - Object that should have the given property in its prototype chain.
+     * @param {string} property_name - Expected property name.
+     * @param {string} [description] - Description of the condition being tested.
+     */
+    function assert_readonly(object, property_name, description)
+    {
+         var initial_value = object[property_name];
+         try {
+             //Note that this can have side effects in the case where
+             //the property has PutForwards
+             object[property_name] = initial_value + "a"; //XXX use some other value here?
+             assert(same_value(object[property_name], initial_value),
+                    "assert_readonly", description,
+                    "changing property ${p} succeeded",
+                    {p:property_name});
+         } finally {
+             object[property_name] = initial_value;
+         }
+    }
+    expose_assert(assert_readonly, "assert_readonly");
+
+    /**
+     * Assert a JS Error with the expected constructor is thrown.
+     *
+     * @param {object} constructor The expected exception constructor.
+     * @param {Function} func Function which should throw.
+     * @param {string} [description] Error description for the case that the error is not thrown.
+     */
+    function assert_throws_js(constructor, func, description)
+    {
+        assert_throws_js_impl(constructor, func, description,
+                              "assert_throws_js");
+    }
+    expose_assert(assert_throws_js, "assert_throws_js");
+
+    /**
+     * Like assert_throws_js but allows specifying the assertion type
+     * (assert_throws_js or promise_rejects_js, in practice).
+     */
+    function assert_throws_js_impl(constructor, func, description,
+                                   assertion_type)
+    {
+        try {
+            func.call(this);
+            assert(false, assertion_type, description,
+                   "${func} did not throw", {func:func});
+        } catch (e) {
+            if (e instanceof AssertionError) {
+                throw e;
+            }
+
+            // Basic sanity-checks on the thrown exception.
+            assert(typeof e === "object",
+                   assertion_type, description,
+                   "${func} threw ${e} with type ${type}, not an object",
+                   {func:func, e:e, type:typeof e});
+
+            assert(e !== null,
+                   assertion_type, description,
+                   "${func} threw null, not an object",
+                   {func:func});
+
+            // Basic sanity-check on the passed-in constructor
+            assert(typeof constructor == "function",
+                   assertion_type, description,
+                   "${constructor} is not a constructor",
+                   {constructor:constructor});
+            var obj = constructor;
+            while (obj) {
+                if (typeof obj === "function" &&
+                    obj.name === "Error") {
+                    break;
+                }
+                obj = Object.getPrototypeOf(obj);
+            }
+            assert(obj != null,
+                   assertion_type, description,
+                   "${constructor} is not an Error subtype",
+                   {constructor:constructor});
+
+            // And checking that our exception is reasonable
+            assert(e.constructor === constructor &&
+                   e.name === constructor.name,
+                   assertion_type, description,
+                   "${func} threw ${actual} (${actual_name}) expected instance of ${expected} (${expected_name})",
+                   {func:func, actual:e, actual_name:e.name,
+                    expected:constructor,
+                    expected_name:constructor.name});
+        }
+    }
+
+    // TODO: Figure out how to document the overloads better.
+    // sphinx-js doesn't seem to handle @variation correctly,
+    // and only expects a single JSDoc entry per function.
+    /**
+     * Assert a DOMException with the expected type is thrown.
+     *
+     * There are two ways of calling assert_throws_dom:
+     *
+     * 1) If the DOMException is expected to come from the current global, the
+     * second argument should be the function expected to throw and a third,
+     * optional, argument is the assertion description.
+     *
+     * 2) If the DOMException is expected to come from some other global, the
+     * second argument should be the DOMException constructor from that global,
+     * the third argument the function expected to throw, and the fourth, optional,
+     * argument the assertion description.
+     *
+     * @param {number|string} type - The expected exception name or
+     * code.  See the `table of names and codes
+     * <https://webidl.spec.whatwg.org/#dfn-error-names-table>`_. If a
+     * number is passed it should be one of the numeric code values in
+     * that table (e.g. 3, 4, etc).  If a string is passed it can
+     * either be an exception name (e.g. "HierarchyRequestError",
+     * "WrongDocumentError") or the name of the corresponding error
+     * code (e.g. "``HIERARCHY_REQUEST_ERR``", "``WRONG_DOCUMENT_ERR``").
+     * @param {Function} descriptionOrFunc - The function expected to
+     * throw (if the exception comes from another global), or the
+     * optional description of the condition being tested (if the
+     * exception comes from the current global).
+     * @param {string} [description] - Description of the condition
+     * being tested (if the exception comes from another global).
+     *
+     */
+    function assert_throws_dom(type, funcOrConstructor, descriptionOrFunc, maybeDescription)
+    {
+        let constructor, func, description;
+        if (funcOrConstructor.name === "DOMException") {
+            constructor = funcOrConstructor;
+            func = descriptionOrFunc;
+            description = maybeDescription;
+        } else {
+            constructor = self.DOMException;
+            func = funcOrConstructor;
+            description = descriptionOrFunc;
+            assert(maybeDescription === undefined,
+                   "Too many args pased to no-constructor version of assert_throws_dom");
+        }
+        assert_throws_dom_impl(type, func, description, "assert_throws_dom", constructor)
+    }
+    expose_assert(assert_throws_dom, "assert_throws_dom");
+
+    /**
+     * Similar to assert_throws_dom but allows specifying the assertion type
+     * (assert_throws_dom or promise_rejects_dom, in practice).  The
+     * "constructor" argument must be the DOMException constructor from the
+     * global we expect the exception to come from.
+     */
+    function assert_throws_dom_impl(type, func, description, assertion_type, constructor)
+    {
+        try {
+            func.call(this);
+            assert(false, assertion_type, description,
+                   "${func} did not throw", {func:func});
+        } catch (e) {
+            if (e instanceof AssertionError) {
+                throw e;
+            }
+
+            // Basic sanity-checks on the thrown exception.
+            assert(typeof e === "object",
+                   assertion_type, description,
+                   "${func} threw ${e} with type ${type}, not an object",
+                   {func:func, e:e, type:typeof e});
+
+            assert(e !== null,
+                   assertion_type, description,
+                   "${func} threw null, not an object",
+                   {func:func});
+
+            // Sanity-check our type
+            assert(typeof type == "number" ||
+                   typeof type == "string",
+                   assertion_type, description,
+                   "${type} is not a number or string",
+                   {type:type});
+
+            var codename_name_map = {
+                INDEX_SIZE_ERR: 'IndexSizeError',
+                HIERARCHY_REQUEST_ERR: 'HierarchyRequestError',
+                WRONG_DOCUMENT_ERR: 'WrongDocumentError',
+                INVALID_CHARACTER_ERR: 'InvalidCharacterError',
+                NO_MODIFICATION_ALLOWED_ERR: 'NoModificationAllowedError',
+                NOT_FOUND_ERR: 'NotFoundError',
+                NOT_SUPPORTED_ERR: 'NotSupportedError',
+                INUSE_ATTRIBUTE_ERR: 'InUseAttributeError',
+                INVALID_STATE_ERR: 'InvalidStateError',
+                SYNTAX_ERR: 'SyntaxError',
+                INVALID_MODIFICATION_ERR: 'InvalidModificationError',
+                NAMESPACE_ERR: 'NamespaceError',
+                INVALID_ACCESS_ERR: 'InvalidAccessError',
+                TYPE_MISMATCH_ERR: 'TypeMismatchError',
+                SECURITY_ERR: 'SecurityError',
+                NETWORK_ERR: 'NetworkError',
+                ABORT_ERR: 'AbortError',
+                URL_MISMATCH_ERR: 'URLMismatchError',
+                QUOTA_EXCEEDED_ERR: 'QuotaExceededError',
+                TIMEOUT_ERR: 'TimeoutError',
+                INVALID_NODE_TYPE_ERR: 'InvalidNodeTypeError',
+                DATA_CLONE_ERR: 'DataCloneError'
+            };
+
+            var name_code_map = {
+                IndexSizeError: 1,
+                HierarchyRequestError: 3,
+                WrongDocumentError: 4,
+                InvalidCharacterError: 5,
+                NoModificationAllowedError: 7,
+                NotFoundError: 8,
+                NotSupportedError: 9,
+                InUseAttributeError: 10,
+                InvalidStateError: 11,
+                SyntaxError: 12,
+                InvalidModificationError: 13,
+                NamespaceError: 14,
+                InvalidAccessError: 15,
+                TypeMismatchError: 17,
+                SecurityError: 18,
+                NetworkError: 19,
+                AbortError: 20,
+                URLMismatchError: 21,
+                QuotaExceededError: 22,
+                TimeoutError: 23,
+                InvalidNodeTypeError: 24,
+                DataCloneError: 25,
+
+                EncodingError: 0,
+                NotReadableError: 0,
+                UnknownError: 0,
+                ConstraintError: 0,
+                DataError: 0,
+                TransactionInactiveError: 0,
+                ReadOnlyError: 0,
+                VersionError: 0,
+                OperationError: 0,
+                NotAllowedError: 0,
+                OptOutError: 0
+            };
+
+            var code_name_map = {};
+            for (var key in name_code_map) {
+                if (name_code_map[key] > 0) {
+                    code_name_map[name_code_map[key]] = key;
+                }
+            }
+
+            var required_props = {};
+            var name;
+
+            if (typeof type === "number") {
+                if (type === 0) {
+                    throw new AssertionError('Test bug: ambiguous DOMException code 0 passed to assert_throws_dom()');
+                } else if (!(type in code_name_map)) {
+                    throw new AssertionError('Test bug: unrecognized DOMException code "' + type + '" passed to assert_throws_dom()');
+                }
+                name = code_name_map[type];
+                required_props.code = type;
+            } else if (typeof type === "string") {
+                name = type in codename_name_map ? codename_name_map[type] : type;
+                if (!(name in name_code_map)) {
+                    throw new AssertionError('Test bug: unrecognized DOMException code name or name "' + type + '" passed to assert_throws_dom()');
+                }
+
+                required_props.code = name_code_map[name];
+            }
+
+            if (required_props.code === 0 ||
+               ("name" in e &&
+                e.name !== e.name.toUpperCase() &&
+                e.name !== "DOMException")) {
+                // New style exception: also test the name property.
+                required_props.name = name;
+            }
+
+            for (var prop in required_props) {
+                assert(prop in e && e[prop] == required_props[prop],
+                       assertion_type, description,
+                       "${func} threw ${e} that is not a DOMException " + type + ": property ${prop} is equal to ${actual}, expected ${expected}",
+                       {func:func, e:e, prop:prop, actual:e[prop], expected:required_props[prop]});
+            }
+
+            // Check that the exception is from the right global.  This check is last
+            // so more specific, and more informative, checks on the properties can
+            // happen in case a totally incorrect exception is thrown.
+            assert(e.constructor === constructor,
+                   assertion_type, description,
+                   "${func} threw an exception from the wrong global",
+                   {func});
+
+        }
+    }
+
+    /**
+     * Assert the provided value is thrown.
+     *
+     * @param {value} exception The expected exception.
+     * @param {Function} func Function which should throw.
+     * @param {string} [description] Error description for the case that the error is not thrown.
+     */
+    function assert_throws_exactly(exception, func, description)
+    {
+        assert_throws_exactly_impl(exception, func, description,
+                                   "assert_throws_exactly");
+    }
+    expose_assert(assert_throws_exactly, "assert_throws_exactly");
+
+    /**
+     * Like assert_throws_exactly but allows specifying the assertion type
+     * (assert_throws_exactly or promise_rejects_exactly, in practice).
+     */
+    function assert_throws_exactly_impl(exception, func, description,
+                                        assertion_type)
+    {
+        try {
+            func.call(this);
+            assert(false, assertion_type, description,
+                   "${func} did not throw", {func:func});
+        } catch (e) {
+            if (e instanceof AssertionError) {
+                throw e;
+            }
+
+            assert(same_value(e, exception), assertion_type, description,
+                   "${func} threw ${e} but we expected it to throw ${exception}",
+                   {func:func, e:e, exception:exception});
+        }
+    }
+
+    /**
+     * Asserts if called. Used to ensure that a specific codepath is
+     * not taken e.g. that an error event isn't fired.
+     *
+     * @param {string} [description] - Description of the condition being tested.
+     */
+    function assert_unreached(description) {
+         assert(false, "assert_unreached", description,
+                "Reached unreachable code");
+    }
+    expose_assert(assert_unreached, "assert_unreached");
+
+    /**
+     * @callback AssertFunc
+     * @param {Any} actual
+     * @param {Any} expected
+     * @param {Any[]} args
+     */
+
+    /**
+     * Asserts that ``actual`` matches at least one value of ``expected``
+     * according to a comparison defined by ``assert_func``.
+     *
+     * Note that tests with multiple allowed pass conditions are bad
+     * practice unless the spec specifically allows multiple
+     * behaviours. Test authors should not use this method simply to
+     * hide UA bugs.
+     *
+     * @param {AssertFunc} assert_func - Function to compare actual
+     * and expected. It must throw when the comparison fails and
+     * return when the comparison passes.
+     * @param {Any} actual - Test value.
+     * @param {Array} expected_array - Array of possible expected values.
+     * @param {Any[]} args - Additional arguments to pass to ``assert_func``.
+     */
+    function assert_any(assert_func, actual, expected_array, ...args)
+    {
+        var errors = [];
+        var passed = false;
+        forEach(expected_array,
+                function(expected)
+                {
+                    try {
+                        assert_func.apply(this, [actual, expected].concat(args));
+                        passed = true;
+                    } catch (e) {
+                        errors.push(e.message);
+                    }
+                });
+        if (!passed) {
+            throw new AssertionError(errors.join("\n\n"));
+        }
+    }
+    // FIXME: assert_any cannot use expose_assert, because assert_wrapper does
+    // not support nested assert calls (e.g. to assert_func). We need to
+    // support bypassing assert_wrapper for the inner asserts here.
+    expose(assert_any, "assert_any");
+
+    /**
+     * Assert that a feature is implemented, based on a 'truthy' condition.
+     *
+     * This function should be used to early-exit from tests in which there is
+     * no point continuing without support for a non-optional spec or spec
+     * feature. For example:
+     *
+     *     assert_implements(window.Foo, 'Foo is not supported');
+     *
+     * @param {object} condition The truthy value to test
+     * @param {string} [description] Error description for the case that the condition is not truthy.
+     */
+    function assert_implements(condition, description) {
+        assert(!!condition, "assert_implements", description);
+    }
+    expose_assert(assert_implements, "assert_implements")
+
+    /**
+     * Assert that an optional feature is implemented, based on a 'truthy' condition.
+     *
+     * This function should be used to early-exit from tests in which there is
+     * no point continuing without support for an explicitly optional spec or
+     * spec feature. For example:
+     *
+     *     assert_implements_optional(video.canPlayType("video/webm"),
+     *                                "webm video playback not supported");
+     *
+     * @param {object} condition The truthy value to test
+     * @param {string} [description] Error description for the case that the condition is not truthy.
+     */
+    function assert_implements_optional(condition, description) {
+        if (!condition) {
+            throw new OptionalFeatureUnsupportedError(description);
+        }
+    }
+    expose_assert(assert_implements_optional, "assert_implements_optional");
+
+    /**
+     * @class
+     *
+     * A single subtest. A Test is not constructed directly but via the
+     * :js:func:`test`, :js:func:`async_test` or :js:func:`promise_test` functions.
+     *
+     * @param {string} name - This must be unique in a given file and must be
+     * invariant between runs.
+     *
+     */
+    function Test(name, properties)
+    {
+        if (tests.file_is_test && tests.tests.length) {
+            throw new Error("Tried to create a test with file_is_test");
+        }
+        /** The test name. */
+        this.name = name;
+
+        this.phase = (tests.is_aborted || tests.phase === tests.phases.COMPLETE) ?
+            this.phases.COMPLETE : this.phases.INITIAL;
+
+        /** The test status code.*/
+        this.status = this.NOTRUN;
+        this.timeout_id = null;
+        this.index = null;
+
+        this.properties = properties || {};
+        this.timeout_length = settings.test_timeout;
+        if (this.timeout_length !== null) {
+            this.timeout_length *= tests.timeout_multiplier;
+        }
+
+        /** A message indicating the reason for test failure. */
+        this.message = null;
+        /** Stack trace in case of failure. */
+        this.stack = null;
+
+        this.steps = [];
+        this._is_promise_test = false;
+
+        this.cleanup_callbacks = [];
+        this._user_defined_cleanup_count = 0;
+        this._done_callbacks = [];
+
+        if (typeof AbortController === "function") {
+            this._abortController = new AbortController();
+        }
+
+        // Tests declared following harness completion are likely an indication
+        // of a programming error, but they cannot be reported
+        // deterministically.
+        if (tests.phase === tests.phases.COMPLETE) {
+            return;
+        }
+
+        tests.push(this);
+    }
+
+    /**
+     * Enum of possible test statuses.
+     *
+     * :values:
+     *   - ``PASS``
+     *   - ``FAIL``
+     *   - ``TIMEOUT``
+     *   - ``NOTRUN``
+     *   - ``PRECONDITION_FAILED``
+     */
+    Test.statuses = {
+        PASS:0,
+        FAIL:1,
+        TIMEOUT:2,
+        NOTRUN:3,
+        PRECONDITION_FAILED:4
+    };
+
+    Test.prototype = merge({}, Test.statuses);
+
+    Test.prototype.phases = {
+        INITIAL:0,
+        STARTED:1,
+        HAS_RESULT:2,
+        CLEANING:3,
+        COMPLETE:4
+    };
+
+    Test.prototype.status_formats = {
+        0: "Pass",
+        1: "Fail",
+        2: "Timeout",
+        3: "Not Run",
+        4: "Optional Feature Unsupported",
+    }
+
+    Test.prototype.format_status = function() {
+        return this.status_formats[this.status];
+    }
+
+    Test.prototype.structured_clone = function()
+    {
+        if (!this._structured_clone) {
+            var msg = this.message;
+            msg = msg ? String(msg) : msg;
+            this._structured_clone = merge({
+                name:String(this.name),
+                properties:merge({}, this.properties),
+                phases:merge({}, this.phases)
+            }, Test.statuses);
+        }
+        this._structured_clone.status = this.status;
+        this._structured_clone.message = this.message;
+        this._structured_clone.stack = this.stack;
+        this._structured_clone.index = this.index;
+        this._structured_clone.phase = this.phase;
+        return this._structured_clone;
+    };
+
+    /**
+     * Run a single step of an ongoing test.
+     *
+     * @param {string} func - Callback function to run as a step. If
+     * this throws an :js:func:`AssertionError`, or any other
+     * exception, the :js:class:`Test` status is set to ``FAIL``.
+     * @param {Object} [this_obj] - The object to use as the this
+     * value when calling ``func``. Defaults to the  :js:class:`Test` object.
+     */
+    Test.prototype.step = function(func, this_obj)
+    {
+        if (this.phase > this.phases.STARTED) {
+            return;
+        }
+
+        if (settings.debug && this.phase !== this.phases.STARTED) {
+            console.log("TEST START", this.name);
+        }
+        this.phase = this.phases.STARTED;
+        //If we don't get a result before the harness times out that will be a test timeout
+        this.set_status(this.TIMEOUT, "Test timed out");
+
+        tests.started = true;
+        tests.current_test = this;
+        tests.notify_test_state(this);
+
+        if (this.timeout_id === null) {
+            this.set_timeout();
+        }
+
+        this.steps.push(func);
+
+        if (arguments.length === 1) {
+            this_obj = this;
+        }
+
+        if (settings.debug) {
+            console.debug("TEST STEP", this.name);
+        }
+
+        try {
+            return func.apply(this_obj, Array.prototype.slice.call(arguments, 2));
+        } catch (e) {
+            if (this.phase >= this.phases.HAS_RESULT) {
+                return;
+            }
+            var status = e instanceof OptionalFeatureUnsupportedError ? this.PRECONDITION_FAILED : this.FAIL;
+            var message = String((typeof e === "object" && e !== null) ? e.message : e);
+            var stack = e.stack ? e.stack : null;
+
+            this.set_status(status, message, stack);
+            this.phase = this.phases.HAS_RESULT;
+            this.done();
+        } finally {
+            this.current_test = null;
+        }
+    };
+
+    /**
+     * Wrap a function so that it runs as a step of the current test.
+     *
+     * This allows creating a callback function that will run as a
+     * test step.
+     *
+     * @example
+     * let t = async_test("Example");
+     * onload = t.step_func(e => {
+     *   assert_equals(e.name, "load");
+     *   // Mark the test as complete.
+     *   t.done();
+     * })
+     *
+     * @param {string} func - Function to run as a step. If this
+     * throws an :js:func:`AssertionError`, or any other exception,
+     * the :js:class:`Test` status is set to ``FAIL``.
+     * @param {Object} [this_obj] - The object to use as the this
+     * value when calling ``func``. Defaults to the :js:class:`Test` object.
+     */
+    Test.prototype.step_func = function(func, this_obj)
+    {
+        var test_this = this;
+
+        if (arguments.length === 1) {
+            this_obj = test_this;
+        }
+
+        return function()
+        {
+            return test_this.step.apply(test_this, [func, this_obj].concat(
+                Array.prototype.slice.call(arguments)));
+        };
+    };
+
+    /**
+     * Wrap a function so that it runs as a step of the current test,
+     * and automatically marks the test as complete if the function
+     * returns without error.
+     *
+     * @param {string} func - Function to run as a step. If this
+     * throws an :js:func:`AssertionError`, or any other exception,
+     * the :js:class:`Test` status is set to ``FAIL``. If it returns
+     * without error the status is set to ``PASS``.
+     * @param {Object} [this_obj] - The object to use as the this
+     * value when calling `func`. Defaults to the :js:class:`Test` object.
+     */
+    Test.prototype.step_func_done = function(func, this_obj)
+    {
+        var test_this = this;
+
+        if (arguments.length === 1) {
+            this_obj = test_this;
+        }
+
+        return function()
+        {
+            if (func) {
+                test_this.step.apply(test_this, [func, this_obj].concat(
+                    Array.prototype.slice.call(arguments)));
+            }
+            test_this.done();
+        };
+    };
+
+    /**
+     * Return a function that automatically sets the current test to
+     * ``FAIL`` if it's called.
+     *
+     * @param {string} [description] - Error message to add to assert
+     * in case of failure.
+     *
+     */
+    Test.prototype.unreached_func = function(description)
+    {
+        return this.step_func(function() {
+            assert_unreached(description);
+        });
+    };
+
+    /**
+     * Run a function as a step of the test after a given timeout.
+     *
+     * This multiplies the timeout by the global timeout multiplier to
+     * account for the expected execution speed of the current test
+     * environment. For example ``test.step_timeout(f, 2000)`` with a
+     * timeout multiplier of 2 will wait for 4000ms before calling ``f``.
+     *
+     * In general it's encouraged to use :js:func:`Test.step_wait` or
+     * :js:func:`step_wait_func` in preference to this function where possible,
+     * as they provide better test performance.
+     *
+     * @param {Function} func - Function to run as a test
+     * step.
+     * @param {number} timeout - Time in ms to wait before running the
+     * test step. The actual wait time is ``timeout`` x
+     * ``timeout_multiplier``.
+     *
+     */
+    Test.prototype.step_timeout = function(func, timeout) {
+        var test_this = this;
+        var args = Array.prototype.slice.call(arguments, 2);
+        return setTimeout(this.step_func(function() {
+            return func.apply(test_this, args);
+        }), timeout * tests.timeout_multiplier);
+    };
+
+    /**
+     * Poll for a function to return true, and call a callback
+     * function once it does, or assert if a timeout is
+     * reached. This is preferred over a simple step_timeout
+     * whenever possible since it allows the timeout to be longer
+     * to reduce intermittents without compromising test execution
+     * speed when the condition is quickly met.
+     *
+     * @param {Function} cond A function taking no arguments and
+     *                        returning a boolean. The callback is called
+     *                        when this function returns true.
+     * @param {Function} func A function taking no arguments to call once
+     *                        the condition is met.
+     * @param {string} [description] Error message to add to assert in case of
+     *                               failure.
+     * @param {number} timeout Timeout in ms. This is multiplied by the global
+     *                         timeout_multiplier
+     * @param {number} interval Polling interval in ms
+     *
+     */
+    Test.prototype.step_wait_func = function(cond, func, description,
+                                             timeout=3000, interval=100) {
+        var timeout_full = timeout * tests.timeout_multiplier;
+        var remaining = Math.ceil(timeout_full / interval);
+        var test_this = this;
+
+        var wait_for_inner = test_this.step_func(() => {
+            if (cond()) {
+                func();
+            } else {
+                if(remaining === 0) {
+                    assert(false, "step_wait_func", description,
+                           "Timed out waiting on condition");
+                }
+                remaining--;
+                setTimeout(wait_for_inner, interval);
+            }
+        });
+
+        wait_for_inner();
+    };
+
+    /**
+     * Poll for a function to return true, and invoke a callback
+     * followed by this.done() once it does, or assert if a timeout
+     * is reached. This is preferred over a simple step_timeout
+     * whenever possible since it allows the timeout to be longer
+     * to reduce intermittents without compromising test execution speed
+     * when the condition is quickly met.
+     *
+     * @example
+     * async_test(t => {
+     *  const popup = window.open("resources/coop-coep.py?coop=same-origin&coep=&navigate=about:blank");
+     *  t.add_cleanup(() => popup.close());
+     *  assert_equals(window, popup.opener);
+     *
+     *  popup.onload = t.step_func(() => {
+     *    assert_true(popup.location.href.endsWith("&navigate=about:blank"));
+     *    // Use step_wait_func_done as about:blank cannot message back.
+     *    t.step_wait_func_done(() => popup.location.href === "about:blank");
+     *  });
+     * }, "Navigating a popup to about:blank");
+     *
+     * @param {Function} cond A function taking no arguments and
+     *                        returning a boolean. The callback is called
+     *                        when this function returns true.
+     * @param {Function} func A function taking no arguments to call once
+     *                        the condition is met.
+     * @param {string} [description] Error message to add to assert in case of
+     *                               failure.
+     * @param {number} timeout Timeout in ms. This is multiplied by the global
+     *                         timeout_multiplier
+     * @param {number} interval Polling interval in ms
+     *
+     */
+    Test.prototype.step_wait_func_done = function(cond, func, description,
+                                                  timeout=3000, interval=100) {
+         this.step_wait_func(cond, () => {
+            if (func) {
+                func();
+            }
+            this.done();
+         }, description, timeout, interval);
+    };
+
+    /**
+     * Poll for a function to return true, and resolve a promise
+     * once it does, or assert if a timeout is reached. This is
+     * preferred over a simple step_timeout whenever possible
+     * since it allows the timeout to be longer to reduce
+     * intermittents without compromising test execution speed
+     * when the condition is quickly met.
+     *
+     * @example
+     * promise_test(async t => {
+     *  // …
+     * await t.step_wait(() => frame.contentDocument === null, "Frame navigated to a cross-origin document");
+     * // …
+     * }, "");
+     *
+     * @param {Function} cond A function taking no arguments and
+     *                        returning a boolean.
+     * @param {string} [description] Error message to add to assert in case of
+     *                              failure.
+     * @param {number} timeout Timeout in ms. This is multiplied by the global
+     *                         timeout_multiplier
+     * @param {number} interval Polling interval in ms
+     * @returns {Promise} Promise resolved once cond is met.
+     *
+     */
+    Test.prototype.step_wait = function(cond, description, timeout=3000, interval=100) {
+        return new Promise(resolve => {
+            this.step_wait_func(cond, resolve, description, timeout, interval);
+        });
+    }
+
+    /*
+     * Private method for registering cleanup functions. `testharness.js`
+     * internals should use this method instead of the public `add_cleanup`
+     * method in order to hide implementation details from the harness status
+     * message in the case errors.
+     */
+    Test.prototype._add_cleanup = function(callback) {
+        this.cleanup_callbacks.push(callback);
+    };
+
+    /**
+     * Schedule a function to be run after the test result is known, regardless
+     * of passing or failing state.
+     *
+     * The behavior of this function will not
+     * influence the result of the test, but if an exception is thrown, the
+     * test harness will report an error.
+     *
+     * @param {Function} callback - The cleanup function to run. This
+     * is called with no arguments.
+     */
+    Test.prototype.add_cleanup = function(callback) {
+        this._user_defined_cleanup_count += 1;
+        this._add_cleanup(callback);
+    };
+
+    Test.prototype.set_timeout = function()
+    {
+        if (this.timeout_length !== null) {
+            var this_obj = this;
+            this.timeout_id = setTimeout(function()
+                                         {
+                                             this_obj.timeout();
+                                         }, this.timeout_length);
+        }
+    };
+
+    Test.prototype.set_status = function(status, message, stack)
+    {
+        this.status = status;
+        this.message = message;
+        this.stack = stack ? stack : null;
+    };
+
+    /**
+     * Manually set the test status to ``TIMEOUT``.
+     */
+    Test.prototype.timeout = function()
+    {
+        this.timeout_id = null;
+        this.set_status(this.TIMEOUT, "Test timed out");
+        this.phase = this.phases.HAS_RESULT;
+        this.done();
+    };
+
+    /**
+     * Manually set the test status to ``TIMEOUT``.
+     *
+     * Alias for `Test.timeout <#Test.timeout>`_.
+     */
+    Test.prototype.force_timeout = function() {
+        return this.timeout();
+    };
+
+    /**
+     * Mark the test as complete.
+     *
+     * This sets the test status to ``PASS`` if no other status was
+     * already recorded. Any subsequent attempts to run additional
+     * test steps will be ignored.
+     *
+     * After setting the test status any test cleanup functions will
+     * be run.
+     */
+    Test.prototype.done = function()
+    {
+        if (this.phase >= this.phases.CLEANING) {
+            return;
+        }
+
+        if (this.phase <= this.phases.STARTED) {
+            this.set_status(this.PASS, null);
+        }
+
+        if (global_scope.clearTimeout) {
+            clearTimeout(this.timeout_id);
+        }
+
+        if (settings.debug) {
+            console.log("TEST DONE",
+                        this.status,
+                        this.name);
+        }
+
+        this.cleanup();
+    };
+
+    function add_test_done_callback(test, callback)
+    {
+        if (test.phase === test.phases.COMPLETE) {
+            callback();
+            return;
+        }
+
+        test._done_callbacks.push(callback);
+    }
+
+    /*
+     * Invoke all specified cleanup functions. If one or more produce an error,
+     * the context is in an unpredictable state, so all further testing should
+     * be cancelled.
+     */
+    Test.prototype.cleanup = function() {
+        var errors = [];
+        var bad_value_count = 0;
+        function on_error(e) {
+            errors.push(e);
+            // Abort tests immediately so that tests declared within subsequent
+            // cleanup functions are not run.
+            tests.abort();
+        }
+        var this_obj = this;
+        var results = [];
+
+        this.phase = this.phases.CLEANING;
+
+        if (this._abortController) {
+            this._abortController.abort("Test cleanup");
+        }
+
+        forEach(this.cleanup_callbacks,
+                function(cleanup_callback) {
+                    var result;
+
+                    try {
+                        result = cleanup_callback();
+                    } catch (e) {
+                        on_error(e);
+                        return;
+                    }
+
+                    if (!is_valid_cleanup_result(this_obj, result)) {
+                        bad_value_count += 1;
+                        // Abort tests immediately so that tests declared
+                        // within subsequent cleanup functions are not run.
+                        tests.abort();
+                    }
+
+                    results.push(result);
+                });
+
+        if (!this._is_promise_test) {
+            cleanup_done(this_obj, errors, bad_value_count);
+        } else {
+            all_async(results,
+                      function(result, done) {
+                          if (result && typeof result.then === "function") {
+                              result
+                                  .then(null, on_error)
+                                  .then(done);
+                          } else {
+                              done();
+                          }
+                      },
+                      function() {
+                          cleanup_done(this_obj, errors, bad_value_count);
+                      });
+        }
+    };
+
+    /*
+     * Determine if the return value of a cleanup function is valid for a given
+     * test. Any test may return the value `undefined`. Tests created with
+     * `promise_test` may alternatively return "thenable" object values.
+     */
+    function is_valid_cleanup_result(test, result) {
+        if (result === undefined) {
+            return true;
+        }
+
+        if (test._is_promise_test) {
+            return result && typeof result.then === "function";
+        }
+
+        return false;
+    }
+
+    function cleanup_done(test, errors, bad_value_count) {
+        if (errors.length || bad_value_count) {
+            var total = test._user_defined_cleanup_count;
+
+            tests.status.status = tests.status.ERROR;
+            tests.status.stack = null;
+            tests.status.message = "Test named '" + test.name +
+                "' specified " + total +
+                " 'cleanup' function" + (total > 1 ? "s" : "");
+
+            if (errors.length) {
+                tests.status.message += ", and " + errors.length + " failed";
+                tests.status.stack = ((typeof errors[0] === "object" &&
+                                       errors[0].hasOwnProperty("stack")) ?
+                                      errors[0].stack : null);
+            }
+
+            if (bad_value_count) {
+                var type = test._is_promise_test ?
+                   "non-thenable" : "non-undefined";
+                tests.status.message += ", and " + bad_value_count +
+                    " returned a " + type + " value";
+            }
+
+            tests.status.message += ".";
+        }
+
+        test.phase = test.phases.COMPLETE;
+        tests.result(test);
+        forEach(test._done_callbacks,
+                function(callback) {
+                    callback();
+                });
+        test._done_callbacks.length = 0;
+    }
+
+    /**
+     * Gives an AbortSignal that will be aborted when the test finishes.
+     */
+    Test.prototype.get_signal = function() {
+        if (!this._abortController) {
+            throw new Error("AbortController is not supported in this browser");
+        }
+        return this._abortController.signal;
+    }
+
+    /**
+     * A RemoteTest object mirrors a Test object on a remote worker. The
+     * associated RemoteWorker updates the RemoteTest object in response to
+     * received events. In turn, the RemoteTest object replicates these events
+     * on the local document. This allows listeners (test result reporting
+     * etc..) to transparently handle local and remote events.
+     */
+    function RemoteTest(clone) {
+        var this_obj = this;
+        Object.keys(clone).forEach(
+                function(key) {
+                    this_obj[key] = clone[key];
+                });
+        this.index = null;
+        this.phase = this.phases.INITIAL;
+        this.update_state_from(clone);
+        this._done_callbacks = [];
+        tests.push(this);
+    }
+
+    RemoteTest.prototype.structured_clone = function() {
+        var clone = {};
+        Object.keys(this).forEach(
+                (function(key) {
+                    var value = this[key];
+                    // `RemoteTest` instances are responsible for managing
+                    // their own "done" callback functions, so those functions
+                    // are not relevant in other execution contexts. Because of
+                    // this (and because Function values cannot be serialized
+                    // for cross-realm transmittance), the property should not
+                    // be considered when cloning instances.
+                    if (key === '_done_callbacks' ) {
+                        return;
+                    }
+
+                    if (typeof value === "object" && value !== null) {
+                        clone[key] = merge({}, value);
+                    } else {
+                        clone[key] = value;
+                    }
+                }).bind(this));
+        clone.phases = merge({}, this.phases);
+        return clone;
+    };
+
+    /**
+     * `RemoteTest` instances are objects which represent tests running in
+     * another realm. They do not define "cleanup" functions (if necessary,
+     * such functions are defined on the associated `Test` instance within the
+     * external realm). However, `RemoteTests` may have "done" callbacks (e.g.
+     * as attached by the `Tests` instance responsible for tracking the overall
+     * test status in the parent realm). The `cleanup` method delegates to
+     * `done` in order to ensure that such callbacks are invoked following the
+     * completion of the `RemoteTest`.
+     */
+    RemoteTest.prototype.cleanup = function() {
+        this.done();
+    };
+    RemoteTest.prototype.phases = Test.prototype.phases;
+    RemoteTest.prototype.update_state_from = function(clone) {
+        this.status = clone.status;
+        this.message = clone.message;
+        this.stack = clone.stack;
+        if (this.phase === this.phases.INITIAL) {
+            this.phase = this.phases.STARTED;
+        }
+    };
+    RemoteTest.prototype.done = function() {
+        this.phase = this.phases.COMPLETE;
+
+        forEach(this._done_callbacks,
+                function(callback) {
+                    callback();
+                });
+    }
+
+    RemoteTest.prototype.format_status = function() {
+        return Test.prototype.status_formats[this.status];
+    }
+
+    /*
+     * A RemoteContext listens for test events from a remote test context, such
+     * as another window or a worker. These events are then used to construct
+     * and maintain RemoteTest objects that mirror the tests running in the
+     * remote context.
+     *
+     * An optional third parameter can be used as a predicate to filter incoming
+     * MessageEvents.
+     */
+    function RemoteContext(remote, message_target, message_filter) {
+        this.running = true;
+        this.started = false;
+        this.tests = new Array();
+        this.early_exception = null;
+
+        var this_obj = this;
+        // If remote context is cross origin assigning to onerror is not
+        // possible, so silently catch those errors.
+        try {
+          remote.onerror = function(error) { this_obj.remote_error(error); };
+        } catch (e) {
+          // Ignore.
+        }
+
+        // Keeping a reference to the remote object and the message handler until
+        // remote_done() is seen prevents the remote object and its message channel
+        // from going away before all the messages are dispatched.
+        this.remote = remote;
+        this.message_target = message_target;
+        this.message_handler = function(message) {
+            var passesFilter = !message_filter || message_filter(message);
+            // The reference to the `running` property in the following
+            // condition is unnecessary because that value is only set to
+            // `false` after the `message_handler` function has been
+            // unsubscribed.
+            // TODO: Simplify the condition by removing the reference.
+            if (this_obj.running && message.data && passesFilter &&
+                (message.data.type in this_obj.message_handlers)) {
+                this_obj.message_handlers[message.data.type].call(this_obj, message.data);
+            }
+        };
+
+        if (self.Promise) {
+            this.done = new Promise(function(resolve) {
+                this_obj.doneResolve = resolve;
+            });
+        }
+
+        this.message_target.addEventListener("message", this.message_handler);
+    }
+
+    RemoteContext.prototype.remote_error = function(error) {
+        if (error.preventDefault) {
+            error.preventDefault();
+        }
+
+        // Defer interpretation of errors until the testing protocol has
+        // started and the remote test's `allow_uncaught_exception` property
+        // is available.
+        if (!this.started) {
+            this.early_exception = error;
+        } else if (!this.allow_uncaught_exception) {
+            this.report_uncaught(error);
+        }
+    };
+
+    RemoteContext.prototype.report_uncaught = function(error) {
+        var message = error.message || String(error);
+        var filename = (error.filename ? " " + error.filename: "");
+        // FIXME: Display remote error states separately from main document
+        // error state.
+        tests.set_status(tests.status.ERROR,
+                         "Error in remote" + filename + ": " + message,
+                         error.stack);
+    };
+
+    RemoteContext.prototype.start = function(data) {
+        this.started = true;
+        this.allow_uncaught_exception = data.properties.allow_uncaught_exception;
+
+        if (this.early_exception && !this.allow_uncaught_exception) {
+            this.report_uncaught(this.early_exception);
+        }
+    };
+
+    RemoteContext.prototype.test_state = function(data) {
+        var remote_test = this.tests[data.test.index];
+        if (!remote_test) {
+            remote_test = new RemoteTest(data.test);
+            this.tests[data.test.index] = remote_test;
+        }
+        remote_test.update_state_from(data.test);
+        tests.notify_test_state(remote_test);
+    };
+
+    RemoteContext.prototype.test_done = function(data) {
+        var remote_test = this.tests[data.test.index];
+        remote_test.update_state_from(data.test);
+        remote_test.done();
+        tests.result(remote_test);
+    };
+
+    RemoteContext.prototype.remote_done = function(data) {
+        if (tests.status.status === null &&
+            data.status.status !== data.status.OK) {
+            tests.set_status(data.status.status, data.status.message, data.status.stack);
+        }
+
+        for (let assert of data.asserts) {
+            var record = new AssertRecord();
+            record.assert_name = assert.assert_name;
+            record.args = assert.args;
+            record.test = assert.test != null ? this.tests[assert.test.index] : null;
+            record.status = assert.status;
+            record.stack = assert.stack;
+            tests.asserts_run.push(record);
+        }
+
+        this.message_target.removeEventListener("message", this.message_handler);
+        this.running = false;
+
+        // If remote context is cross origin assigning to onerror is not
+        // possible, so silently catch those errors.
+        try {
+          this.remote.onerror = null;
+        } catch (e) {
+          // Ignore.
+        }
+
+        this.remote = null;
+        this.message_target = null;
+        if (this.doneResolve) {
+            this.doneResolve();
+        }
+
+        if (tests.all_done()) {
+            tests.complete();
+        }
+    };
+
+    RemoteContext.prototype.message_handlers = {
+        start: RemoteContext.prototype.start,
+        test_state: RemoteContext.prototype.test_state,
+        result: RemoteContext.prototype.test_done,
+        complete: RemoteContext.prototype.remote_done
+    };
+
+    /**
+     * @class
+     * Status of the overall harness
+     */
+    function TestsStatus()
+    {
+        /** The status code */
+        this.status = null;
+        /** Message in case of failure */
+        this.message = null;
+        /** Stack trace in case of an exception. */
+        this.stack = null;
+    }
+
+    /**
+     * Enum of possible harness statuses.
+     *
+     * :values:
+     *   - ``OK``
+     *   - ``ERROR``
+     *   - ``TIMEOUT``
+     *   - ``PRECONDITION_FAILED``
+     */
+    TestsStatus.statuses = {
+        OK:0,
+        ERROR:1,
+        TIMEOUT:2,
+        PRECONDITION_FAILED:3
+    };
+
+    TestsStatus.prototype = merge({}, TestsStatus.statuses);
+
+    TestsStatus.prototype.formats = {
+        0: "OK",
+        1: "Error",
+        2: "Timeout",
+        3: "Optional Feature Unsupported"
+    };
+
+    TestsStatus.prototype.structured_clone = function()
+    {
+        if (!this._structured_clone) {
+            var msg = this.message;
+            msg = msg ? String(msg) : msg;
+            this._structured_clone = merge({
+                status:this.status,
+                message:msg,
+                stack:this.stack
+            }, TestsStatus.statuses);
+        }
+        return this._structured_clone;
+    };
+
+    TestsStatus.prototype.format_status = function() {
+        return this.formats[this.status];
+    };
+
+    /**
+     * @class
+     * Record of an assert that ran.
+     *
+     * @param {Test} test - The test which ran the assert.
+     * @param {string} assert_name - The function name of the assert.
+     * @param {Any} args - The arguments passed to the assert function.
+     */
+    function AssertRecord(test, assert_name, args = []) {
+        /** Name of the assert that ran */
+        this.assert_name = assert_name;
+        /** Test that ran the assert */
+        this.test = test;
+        // Avoid keeping complex objects alive
+        /** Stringification of the arguments that were passed to the assert function */
+        this.args = args.map(x => format_value(x).replace(/\n/g, " "));
+        /** Status of the assert */
+        this.status = null;
+    }
+
+    AssertRecord.prototype.structured_clone = function() {
+        return {
+            assert_name: this.assert_name,
+            test: this.test ? this.test.structured_clone() : null,
+            args: this.args,
+            status: this.status,
+        };
+    };
+
+    function Tests()
+    {
+        this.tests = [];
+        this.num_pending = 0;
+
+        this.phases = {
+            INITIAL:0,
+            SETUP:1,
+            HAVE_TESTS:2,
+            HAVE_RESULTS:3,
+            COMPLETE:4
+        };
+        this.phase = this.phases.INITIAL;
+
+        this.properties = {};
+
+        this.wait_for_finish = false;
+        this.processing_callbacks = false;
+
+        this.allow_uncaught_exception = false;
+
+        this.file_is_test = false;
+        // This value is lazily initialized in order to avoid introducing a
+        // dependency on ECMAScript 2015 Promises to all tests.
+        this.promise_tests = null;
+        this.promise_setup_called = false;
+
+        this.timeout_multiplier = 1;
+        this.timeout_length = test_environment.test_timeout();
+        this.timeout_id = null;
+
+        this.start_callbacks = [];
+        this.test_state_callbacks = [];
+        this.test_done_callbacks = [];
+        this.all_done_callbacks = [];
+
+        this.hide_test_state = false;
+        this.pending_remotes = [];
+
+        this.current_test = null;
+        this.asserts_run = [];
+
+        // Track whether output is enabled, and thus whether or not we should
+        // track asserts.
+        //
+        // On workers we don't get properties set from testharnessreport.js, so
+        // we don't know whether or not to track asserts. To avoid the
+        // resulting performance hit, we assume we are not meant to. This means
+        // that assert tracking does not function on workers.
+        this.output = settings.output && 'document' in global_scope;
+
+        this.status = new TestsStatus();
+
+        var this_obj = this;
+
+        test_environment.add_on_loaded_callback(function() {
+            if (this_obj.all_done()) {
+                this_obj.complete();
+            }
+        });
+
+        this.set_timeout();
+    }
+
+    Tests.prototype.setup = function(func, properties)
+    {
+        if (this.phase >= this.phases.HAVE_RESULTS) {
+            return;
+        }
+
+        if (this.phase < this.phases.SETUP) {
+            this.phase = this.phases.SETUP;
+        }
+
+        this.properties = properties;
+
+        for (var p in properties) {
+            if (properties.hasOwnProperty(p)) {
+                var value = properties[p];
+                if (p == "allow_uncaught_exception") {
+                    this.allow_uncaught_exception = value;
+                } else if (p == "explicit_done" && value) {
+                    this.wait_for_finish = true;
+                } else if (p == "explicit_timeout" && value) {
+                    this.timeout_length = null;
+                    if (this.timeout_id)
+                    {
+                        clearTimeout(this.timeout_id);
+                    }
+                } else if (p == "single_test" && value) {
+                    this.set_file_is_test();
+                } else if (p == "timeout_multiplier") {
+                    this.timeout_multiplier = value;
+                    if (this.timeout_length) {
+                         this.timeout_length *= this.timeout_multiplier;
+                    }
+                } else if (p == "hide_test_state") {
+                    this.hide_test_state = value;
+                } else if (p == "output") {
+                    this.output = value;
+                } else if (p === "debug") {
+                    settings.debug = value;
+                }
+            }
+        }
+
+        if (func) {
+            try {
+                func();
+            } catch (e) {
+                this.status.status = e instanceof OptionalFeatureUnsupportedError ? this.status.PRECONDITION_FAILED : this.status.ERROR;
+                this.status.message = String(e);
+                this.status.stack = e.stack ? e.stack : null;
+                this.complete();
+            }
+        }
+        this.set_timeout();
+    };
+
+    Tests.prototype.set_file_is_test = function() {
+        if (this.tests.length > 0) {
+            throw new Error("Tried to set file as test after creating a test");
+        }
+        this.wait_for_finish = true;
+        this.file_is_test = true;
+        // Create the test, which will add it to the list of tests
+        tests.current_test = async_test();
+    };
+
+    Tests.prototype.set_status = function(status, message, stack)
+    {
+        this.status.status = status;
+        this.status.message = message;
+        this.status.stack = stack ? stack : null;
+    };
+
+    Tests.prototype.set_timeout = function() {
+        if (global_scope.clearTimeout) {
+            var this_obj = this;
+            clearTimeout(this.timeout_id);
+            if (this.timeout_length !== null) {
+                this.timeout_id = setTimeout(function() {
+                                                 this_obj.timeout();
+                                             }, this.timeout_length);
+            }
+        }
+    };
+
+    Tests.prototype.timeout = function() {
+        var test_in_cleanup = null;
+
+        if (this.status.status === null) {
+            forEach(this.tests,
+                    function(test) {
+                        // No more than one test is expected to be in the
+                        // "CLEANUP" phase at any time
+                        if (test.phase === test.phases.CLEANING) {
+                            test_in_cleanup = test;
+                        }
+
+                        test.phase = test.phases.COMPLETE;
+                    });
+
+            // Timeouts that occur while a test is in the "cleanup" phase
+            // indicate that some global state was not properly reverted. This
+            // invalidates the overall test execution, so the timeout should be
+            // reported as an error and cancel the execution of any remaining
+            // tests.
+            if (test_in_cleanup) {
+                this.status.status = this.status.ERROR;
+                this.status.message = "Timeout while running cleanup for " +
+                    "test named \"" + test_in_cleanup.name + "\".";
+                tests.status.stack = null;
+            } else {
+                this.status.status = this.status.TIMEOUT;
+            }
+        }
+
+        this.complete();
+    };
+
+    Tests.prototype.end_wait = function()
+    {
+        this.wait_for_finish = false;
+        if (this.all_done()) {
+            this.complete();
+        }
+    };
+
+    Tests.prototype.push = function(test)
+    {
+        if (this.phase < this.phases.HAVE_TESTS) {
+            this.start();
+        }
+        this.num_pending++;
+        test.index = this.tests.push(test);
+        this.notify_test_state(test);
+    };
+
+    Tests.prototype.notify_test_state = function(test) {
+        var this_obj = this;
+        forEach(this.test_state_callbacks,
+                function(callback) {
+                    callback(test, this_obj);
+                });
+    };
+
+    Tests.prototype.all_done = function() {
+        return (this.tests.length > 0 || this.pending_remotes.length > 0) &&
+                test_environment.all_loaded &&
+                (this.num_pending === 0 || this.is_aborted) && !this.wait_for_finish &&
+                !this.processing_callbacks &&
+                !this.pending_remotes.some(function(w) { return w.running; });
+    };
+
+    Tests.prototype.start = function() {
+        this.phase = this.phases.HAVE_TESTS;
+        this.notify_start();
+    };
+
+    Tests.prototype.notify_start = function() {
+        var this_obj = this;
+        forEach (this.start_callbacks,
+                 function(callback)
+                 {
+                     callback(this_obj.properties);
+                 });
+    };
+
+    Tests.prototype.result = function(test)
+    {
+        // If the harness has already transitioned beyond the `HAVE_RESULTS`
+        // phase, subsequent tests should not cause it to revert.
+        if (this.phase <= this.phases.HAVE_RESULTS) {
+            this.phase = this.phases.HAVE_RESULTS;
+        }
+        this.num_pending--;
+        this.notify_result(test);
+    };
+
+    Tests.prototype.notify_result = function(test) {
+        var this_obj = this;
+        this.processing_callbacks = true;
+        forEach(this.test_done_callbacks,
+                function(callback)
+                {
+                    callback(test, this_obj);
+                });
+        this.processing_callbacks = false;
+        if (this_obj.all_done()) {
+            this_obj.complete();
+        }
+    };
+
+    Tests.prototype.complete = function() {
+        if (this.phase === this.phases.COMPLETE) {
+            return;
+        }
+        var this_obj = this;
+        var all_complete = function() {
+            this_obj.phase = this_obj.phases.COMPLETE;
+            this_obj.notify_complete();
+        };
+        var incomplete = filter(this.tests,
+                                function(test) {
+                                    return test.phase < test.phases.COMPLETE;
+                                });
+
+        /**
+         * To preserve legacy behavior, overall test completion must be
+         * signaled synchronously.
+         */
+        if (incomplete.length === 0) {
+            all_complete();
+            return;
+        }
+
+        all_async(incomplete,
+                  function(test, testDone)
+                  {
+                      if (test.phase === test.phases.INITIAL) {
+                          test.phase = test.phases.COMPLETE;
+                          testDone();
+                      } else {
+                          add_test_done_callback(test, testDone);
+                          test.cleanup();
+                      }
+                  },
+                  all_complete);
+    };
+
+    Tests.prototype.set_assert = function(assert_name, args) {
+        this.asserts_run.push(new AssertRecord(this.current_test, assert_name, args))
+    }
+
+    Tests.prototype.set_assert_status = function(status, stack) {
+        let assert_record = this.asserts_run[this.asserts_run.length - 1];
+        assert_record.status = status;
+        assert_record.stack = stack;
+    }
+
+    /**
+     * Update the harness status to reflect an unrecoverable harness error that
+     * should cancel all further testing. Update all previously-defined tests
+     * which have not yet started to indicate that they will not be executed.
+     */
+    Tests.prototype.abort = function() {
+        this.status.status = this.status.ERROR;
+        this.is_aborted = true;
+
+        forEach(this.tests,
+                function(test) {
+                    if (test.phase === test.phases.INITIAL) {
+                        test.phase = test.phases.COMPLETE;
+                    }
+                });
+    };
+
+    /*
+     * Determine if any tests share the same `name` property. Return an array
+     * containing the names of any such duplicates.
+     */
+    Tests.prototype.find_duplicates = function() {
+        var names = Object.create(null);
+        var duplicates = [];
+
+        forEach (this.tests,
+                 function(test)
+                 {
+                     if (test.name in names && duplicates.indexOf(test.name) === -1) {
+                        duplicates.push(test.name);
+                     }
+                     names[test.name] = true;
+                 });
+
+        return duplicates;
+    };
+
+    function code_unit_str(char) {
+        return 'U+' + char.charCodeAt(0).toString(16);
+    }
+
+    function sanitize_unpaired_surrogates(str) {
+        return str.replace(
+            /([\ud800-\udbff]+)(?![\udc00-\udfff])|(^|[^\ud800-\udbff])([\udc00-\udfff]+)/g,
+            function(_, low, prefix, high) {
+                var output = prefix || "";  // prefix may be undefined
+                var string = low || high;  // only one of these alternates can match
+                for (var i = 0; i < string.length; i++) {
+                    output += code_unit_str(string[i]);
+                }
+                return output;
+            });
+    }
+
+    function sanitize_all_unpaired_surrogates(tests) {
+        forEach (tests,
+                 function (test)
+                 {
+                     var sanitized = sanitize_unpaired_surrogates(test.name);
+
+                     if (test.name !== sanitized) {
+                         test.name = sanitized;
+                         delete test._structured_clone;
+                     }
+                 });
+    }
+
+    Tests.prototype.notify_complete = function() {
+        var this_obj = this;
+        var duplicates;
+
+        if (this.status.status === null) {
+            duplicates = this.find_duplicates();
+
+            // Some transports adhere to UTF-8's restriction on unpaired
+            // surrogates. Sanitize the titles so that the results can be
+            // consistently sent via all transports.
+            sanitize_all_unpaired_surrogates(this.tests);
+
+            // Test names are presumed to be unique within test files--this
+            // allows consumers to use them for identification purposes.
+            // Duplicated names violate this expectation and should therefore
+            // be reported as an error.
+            if (duplicates.length) {
+                this.status.status = this.status.ERROR;
+                this.status.message =
+                   duplicates.length + ' duplicate test name' +
+                   (duplicates.length > 1 ? 's' : '') + ': "' +
+                   duplicates.join('", "') + '"';
+            } else {
+                this.status.status = this.status.OK;
+            }
+        }
+
+        forEach (this.all_done_callbacks,
+                 function(callback)
+                 {
+                     callback(this_obj.tests, this_obj.status, this_obj.asserts_run);
+                 });
+    };
+
+    /*
+     * Constructs a RemoteContext that tracks tests from a specific worker.
+     */
+    Tests.prototype.create_remote_worker = function(worker) {
+        var message_port;
+
+        if (is_service_worker(worker)) {
+            message_port = navigator.serviceWorker;
+            worker.postMessage({type: "connect"});
+        } else if (is_shared_worker(worker)) {
+            message_port = worker.port;
+            message_port.start();
+        } else {
+            message_port = worker;
+        }
+
+        return new RemoteContext(worker, message_port);
+    };
+
+    /*
+     * Constructs a RemoteContext that tracks tests from a specific window.
+     */
+    Tests.prototype.create_remote_window = function(remote) {
+        remote.postMessage({type: "getmessages"}, "*");
+        return new RemoteContext(
+            remote,
+            window,
+            function(msg) {
+                return msg.source === remote;
+            }
+        );
+    };
+
+    Tests.prototype.fetch_tests_from_worker = function(worker) {
+        if (this.phase >= this.phases.COMPLETE) {
+            return;
+        }
+
+        var remoteContext = this.create_remote_worker(worker);
+        this.pending_remotes.push(remoteContext);
+        return remoteContext.done;
+    };
+
+    /**
+     * Get test results from a worker and include them in the current test.
+     *
+     * @param {Worker|SharedWorker|ServiceWorker|MessagePort} port -
+     * Either a worker object or a port connected to a worker which is
+     * running tests..
+     * @returns {Promise} - A promise that's resolved once all the remote tests are complete.
+     */
+    function fetch_tests_from_worker(port) {
+        return tests.fetch_tests_from_worker(port);
+    }
+    expose(fetch_tests_from_worker, 'fetch_tests_from_worker');
+
+    Tests.prototype.fetch_tests_from_window = function(remote) {
+        if (this.phase >= this.phases.COMPLETE) {
+            return;
+        }
+
+        var remoteContext = this.create_remote_window(remote);
+        this.pending_remotes.push(remoteContext);
+        return remoteContext.done;
+    };
+
+    /**
+     * Aggregate tests from separate windows or iframes
+     * into the current document as if they were all part of the same test file.
+     *
+     * The document of the second window (or iframe) should include
+     * ``testharness.js``, but not ``testharnessreport.js``, and use
+     * :js:func:`test`, :js:func:`async_test`, and :js:func:`promise_test` in
+     * the usual manner.
+     *
+     * @param {Window} window - The window to fetch tests from.
+     */
+    function fetch_tests_from_window(window) {
+        return tests.fetch_tests_from_window(window);
+    }
+    expose(fetch_tests_from_window, 'fetch_tests_from_window');
+
+    /**
+     * Get test results from a shadow realm and include them in the current test.
+     *
+     * @param {ShadowRealm} realm - A shadow realm also running the test harness
+     * @returns {Promise} - A promise that's resolved once all the remote tests are complete.
+     */
+    function fetch_tests_from_shadow_realm(realm) {
+        var chan = new MessageChannel();
+        function receiveMessage(msg_json) {
+            chan.port1.postMessage(JSON.parse(msg_json));
+        }
+        var done = tests.fetch_tests_from_worker(chan.port2);
+        realm.evaluate("begin_shadow_realm_tests")(receiveMessage);
+        chan.port2.start();
+        return done;
+    }
+    expose(fetch_tests_from_shadow_realm, 'fetch_tests_from_shadow_realm');
+
+    /**
+     * Begin running tests in this shadow realm test harness.
+     *
+     * To be called after all tests have been loaded; it is an error to call
+     * this more than once or in a non-Shadow Realm environment
+     *
+     * @param {Function} postMessage - A function to send test updates to the
+     * incubating realm-- accepts JSON-encoded messages in the format used by
+     * RemoteContext
+     */
+    function begin_shadow_realm_tests(postMessage) {
+        if (!(test_environment instanceof ShadowRealmTestEnvironment)) {
+            throw new Error("begin_shadow_realm_tests called in non-Shadow Realm environment");
+        }
+
+        test_environment.begin(function (msg) {
+            postMessage(JSON.stringify(msg));
+        });
+    }
+    expose(begin_shadow_realm_tests, 'begin_shadow_realm_tests');
+
+    /**
+     * Timeout the tests.
+     *
+     * This only has an effect when ``explicit_timeout`` has been set
+     * in :js:func:`setup`. In other cases any call is a no-op.
+     *
+     */
+    function timeout() {
+        if (tests.timeout_length === null) {
+            tests.timeout();
+        }
+    }
+    expose(timeout, 'timeout');
+
+    /**
+     * Add a callback that's triggered when the first :js:class:`Test` is created.
+     *
+     * @param {Function} callback - Callback function. This is called
+     * without arguments.
+     */
+    function add_start_callback(callback) {
+        tests.start_callbacks.push(callback);
+    }
+
+    /**
+     * Add a callback that's triggered when a test state changes.
+     *
+     * @param {Function} callback - Callback function, called with the
+     * :js:class:`Test` as the only argument.
+     */
+    function add_test_state_callback(callback) {
+        tests.test_state_callbacks.push(callback);
+    }
+
+    /**
+     * Add a callback that's triggered when a test result is received.
+     *
+     * @param {Function} callback - Callback function, called with the
+     * :js:class:`Test` as the only argument.
+     */
+    function add_result_callback(callback) {
+        tests.test_done_callbacks.push(callback);
+    }
+
+    /**
+     * Add a callback that's triggered when all tests are complete.
+     *
+     * @param {Function} callback - Callback function, called with an
+     * array of :js:class:`Test` objects, a :js:class:`TestsStatus`
+     * object and an array of :js:class:`AssertRecord` objects. If the
+     * debug setting is ``false`` the final argument will be an empty
+     * array.
+     *
+     * For performance reasons asserts are only tracked when the debug
+     * setting is ``true``. In other cases the array of asserts will be
+     * empty.
+     */
+    function add_completion_callback(callback) {
+        tests.all_done_callbacks.push(callback);
+    }
+
+    expose(add_start_callback, 'add_start_callback');
+    expose(add_test_state_callback, 'add_test_state_callback');
+    expose(add_result_callback, 'add_result_callback');
+    expose(add_completion_callback, 'add_completion_callback');
+
+    function remove(array, item) {
+        var index = array.indexOf(item);
+        if (index > -1) {
+            array.splice(index, 1);
+        }
+    }
+
+    function remove_start_callback(callback) {
+        remove(tests.start_callbacks, callback);
+    }
+
+    function remove_test_state_callback(callback) {
+        remove(tests.test_state_callbacks, callback);
+    }
+
+    function remove_result_callback(callback) {
+        remove(tests.test_done_callbacks, callback);
+    }
+
+    function remove_completion_callback(callback) {
+       remove(tests.all_done_callbacks, callback);
+    }
+
+    /*
+     * Output listener
+    */
+
+    function Output() {
+        this.output_document = document;
+        this.output_node = null;
+        this.enabled = settings.output;
+        this.phase = this.INITIAL;
+    }
+
+    Output.prototype.INITIAL = 0;
+    Output.prototype.STARTED = 1;
+    Output.prototype.HAVE_RESULTS = 2;
+    Output.prototype.COMPLETE = 3;
+
+    Output.prototype.setup = function(properties) {
+        if (this.phase > this.INITIAL) {
+            return;
+        }
+
+        //If output is disabled in testharnessreport.js the test shouldn't be
+        //able to override that
+        this.enabled = this.enabled && (properties.hasOwnProperty("output") ?
+                                        properties.output : settings.output);
+    };
+
+    Output.prototype.init = function(properties) {
+        if (this.phase >= this.STARTED) {
+            return;
+        }
+        if (properties.output_document) {
+            this.output_document = properties.output_document;
+        } else {
+            this.output_document = document;
+        }
+        this.phase = this.STARTED;
+    };
+
+    Output.prototype.resolve_log = function() {
+        var output_document;
+        if (this.output_node) {
+            return;
+        }
+        if (typeof this.output_document === "function") {
+            output_document = this.output_document.apply(undefined);
+        } else {
+            output_document = this.output_document;
+        }
+        if (!output_document) {
+            return;
+        }
+        var node = output_document.getElementById("log");
+        if (!node) {
+            if (output_document.readyState === "loading") {
+                return;
+            }
+            node = output_document.createElementNS("http://www.w3.org/1999/xhtml", "div");
+            node.id = "log";
+            if (output_document.body) {
+                output_document.body.appendChild(node);
+            } else {
+                var root = output_document.documentElement;
+                var is_html = (root &&
+                               root.namespaceURI == "http://www.w3.org/1999/xhtml" &&
+                               root.localName == "html");
+                var is_svg = (output_document.defaultView &&
+                              "SVGSVGElement" in output_document.defaultView &&
+                              root instanceof output_document.defaultView.SVGSVGElement);
+                if (is_svg) {
+                    var foreignObject = output_document.createElementNS("http://www.w3.org/2000/svg", "foreignObject");
+                    foreignObject.setAttribute("width", "100%");
+                    foreignObject.setAttribute("height", "100%");
+                    root.appendChild(foreignObject);
+                    foreignObject.appendChild(node);
+                } else if (is_html) {
+                    root.appendChild(output_document.createElementNS("http://www.w3.org/1999/xhtml", "body"))
+                        .appendChild(node);
+                } else {
+                    root.appendChild(node);
+                }
+            }
+        }
+        this.output_document = output_document;
+        this.output_node = node;
+    };
+
+    Output.prototype.show_status = function() {
+        if (this.phase < this.STARTED) {
+            this.init({});
+        }
+        if (!this.enabled || this.phase === this.COMPLETE) {
+            return;
+        }
+        this.resolve_log();
+        if (this.phase < this.HAVE_RESULTS) {
+            this.phase = this.HAVE_RESULTS;
+        }
+        var done_count = tests.tests.length - tests.num_pending;
+        if (this.output_node && !tests.hide_test_state) {
+            if (done_count < 100 ||
+                (done_count < 1000 && done_count % 100 === 0) ||
+                done_count % 1000 === 0) {
+                this.output_node.textContent = "Running, " +
+                    done_count + " complete, " +
+                    tests.num_pending + " remain";
+            }
+        }
+    };
+
+    Output.prototype.show_results = function (tests, harness_status, asserts_run) {
+        if (this.phase >= this.COMPLETE) {
+            return;
+        }
+        if (!this.enabled) {
+            return;
+        }
+        if (!this.output_node) {
+            this.resolve_log();
+        }
+        this.phase = this.COMPLETE;
+
+        var log = this.output_node;
+        if (!log) {
+            return;
+        }
+        var output_document = this.output_document;
+
+        while (log.lastChild) {
+            log.removeChild(log.lastChild);
+        }
+
+        var stylesheet = output_document.createElementNS(xhtml_ns, "style");
+        stylesheet.textContent = stylesheetContent;
+        var heads = output_document.getElementsByTagName("head");
+        if (heads.length) {
+            heads[0].appendChild(stylesheet);
+        }
+
+        var status_number = {};
+        forEach(tests,
+                function(test) {
+                    var status = test.format_status();
+                    if (status_number.hasOwnProperty(status)) {
+                        status_number[status] += 1;
+                    } else {
+                        status_number[status] = 1;
+                    }
+                });
+
+        function status_class(status)
+        {
+            return status.replace(/\s/g, '').toLowerCase();
+        }
+
+        var summary_template = ["section", {"id":"summary"},
+                                ["h2", {}, "Summary"],
+                                function()
+                                {
+                                    var status = harness_status.format_status();
+                                    var rv = [["section", {},
+                                               ["p", {},
+                                                "Harness status: ",
+                                                ["span", {"class":status_class(status)},
+                                                 status
+                                                ],
+                                               ],
+                                               ["button",
+                                                {"onclick": "let evt = new Event('__test_restart'); " +
+                                                 "let canceled = !window.dispatchEvent(evt);" +
+                                                 "if (!canceled) { location.reload() }"},
+                                                "Rerun"]
+                                              ]];
+
+                                    if (harness_status.status === harness_status.ERROR) {
+                                        rv[0].push(["pre", {}, harness_status.message]);
+                                        if (harness_status.stack) {
+                                            rv[0].push(["pre", {}, harness_status.stack]);
+                                        }
+                                    }
+                                    return rv;
+                                },
+                                ["p", {}, "Found ${num_tests} tests"],
+                                function() {
+                                    var rv = [["div", {}]];
+                                    var i = 0;
+                                    while (Test.prototype.status_formats.hasOwnProperty(i)) {
+                                        if (status_number.hasOwnProperty(Test.prototype.status_formats[i])) {
+                                            var status = Test.prototype.status_formats[i];
+                                            rv[0].push(["div", {},
+                                                        ["label", {},
+                                                         ["input", {type:"checkbox", checked:"checked"}],
+                                                         status_number[status] + " ",
+                                                         ["span", {"class":status_class(status)}, status]]]);
+                                        }
+                                        i++;
+                                    }
+                                    return rv;
+                                },
+                               ];
+
+        log.appendChild(render(summary_template, {num_tests:tests.length}, output_document));
+
+        forEach(output_document.querySelectorAll("section#summary label"),
+                function(element)
+                {
+                    on_event(element, "click",
+                             function(e)
+                             {
+                                 if (output_document.getElementById("results") === null) {
+                                     e.preventDefault();
+                                     return;
+                                 }
+                                 var result_class = element.querySelector("span[class]").getAttribute("class");
+                                 var style_element = output_document.querySelector("style#hide-" + result_class);
+                                 var input_element = element.querySelector("input");
+                                 if (!style_element && !input_element.checked) {
+                                     style_element = output_document.createElementNS(xhtml_ns, "style");
+                                     style_element.id = "hide-" + result_class;
+                                     style_element.textContent = "table#results > tbody > tr.overall-"+result_class+"{display:none}";
+                                     output_document.body.appendChild(style_element);
+                                 } else if (style_element && input_element.checked) {
+                                     style_element.parentNode.removeChild(style_element);
+                                 }
+                             });
+                });
+
+        // This use of innerHTML plus manual escaping is not recommended in
+        // general, but is necessary here for performance.  Using textContent
+        // on each individual <td> adds tens of seconds of execution time for
+        // large test suites (tens of thousands of tests).
+        function escape_html(s)
+        {
+            return s.replace(/\&/g, "&amp;")
+                .replace(/</g, "&lt;")
+                .replace(/"/g, "&quot;")
+                .replace(/'/g, "&#39;");
+        }
+
+        function has_assertions()
+        {
+            for (var i = 0; i < tests.length; i++) {
+                if (tests[i].properties.hasOwnProperty("assert")) {
+                    return true;
+                }
+            }
+            return false;
+        }
+
+        function get_assertion(test)
+        {
+            if (test.properties.hasOwnProperty("assert")) {
+                if (Array.isArray(test.properties.assert)) {
+                    return test.properties.assert.join(' ');
+                }
+                return test.properties.assert;
+            }
+            return '';
+        }
+
+        var asserts_run_by_test = new Map();
+        asserts_run.forEach(assert => {
+            if (!asserts_run_by_test.has(assert.test)) {
+                asserts_run_by_test.set(assert.test, []);
+            }
+            asserts_run_by_test.get(assert.test).push(assert);
+        });
+
+        function get_asserts_output(test) {
+            var asserts = asserts_run_by_test.get(test);
+            if (!asserts) {
+                return "No asserts ran";
+            }
+            rv = "<table>";
+            rv += asserts.map(assert => {
+                var output_fn = "<strong>" + escape_html(assert.assert_name) + "</strong>(";
+                var prefix_len = output_fn.length;
+                var output_args = assert.args;
+                var output_len = output_args.reduce((prev, current) => prev+current, prefix_len);
+                if (output_len[output_len.length - 1] > 50) {
+                    output_args = output_args.map((x, i) =>
+                    (i > 0 ? "  ".repeat(prefix_len) : "" )+ x + (i < output_args.length - 1 ? ",\n" : ""));
+                } else {
+                    output_args = output_args.map((x, i) => x + (i < output_args.length - 1 ? ", " : ""));
+                }
+                output_fn += escape_html(output_args.join(""));
+                output_fn += ')';
+                var output_location;
+                if (assert.stack) {
+                    output_location = assert.stack.split("\n", 1)[0].replace(/@?\w+:\/\/[^ "\/]+(?::\d+)?/g, " ");
+                }
+                return "<tr class='overall-" +
+                    status_class(Test.prototype.status_formats[assert.status]) + "'>" +
+                    "<td class='" +
+                    status_class(Test.prototype.status_formats[assert.status]) + "'>" +
+                    Test.prototype.status_formats[assert.status] + "</td>" +
+                    "<td><pre>" +
+                    output_fn +
+                    (output_location ? "\n" + escape_html(output_location) : "") +
+                    "</pre></td></tr>";
+            }
+            ).join("\n");
+            rv += "</table>";
+            return rv;
+        }
+
+        log.appendChild(document.createElementNS(xhtml_ns, "section"));
+        var assertions = has_assertions();
+        var html = "<h2>Details</h2><table id='results' " + (assertions ? "class='assertions'" : "" ) + ">" +
+            "<thead><tr><th>Result</th><th>Test Name</th>" +
+            (assertions ? "<th>Assertion</th>" : "") +
+            "<th>Message</th></tr></thead>" +
+            "<tbody>";
+        for (var i = 0; i < tests.length; i++) {
+            var test = tests[i];
+            html += '<tr class="overall-' +
+                status_class(test.format_status()) +
+                '">' +
+                '<td class="' +
+                status_class(test.format_status()) +
+                '">' +
+                test.format_status() +
+                "</td><td>" +
+                escape_html(test.name) +
+                "</td><td>" +
+                (assertions ? escape_html(get_assertion(test)) + "</td><td>" : "") +
+                escape_html(test.message ? tests[i].message : " ") +
+                (tests[i].stack ? "<pre>" +
+                 escape_html(tests[i].stack) +
+                 "</pre>": "");
+            if (!(test instanceof RemoteTest)) {
+                 html += "<details><summary>Asserts run</summary>" + get_asserts_output(test) + "</details>"
+            }
+            html += "</td></tr>";
+        }
+        html += "</tbody></table>";
+        try {
+            log.lastChild.innerHTML = html;
+        } catch (e) {
+            log.appendChild(document.createElementNS(xhtml_ns, "p"))
+               .textContent = "Setting innerHTML for the log threw an exception.";
+            log.appendChild(document.createElementNS(xhtml_ns, "pre"))
+               .textContent = html;
+        }
+    };
+
+    /*
+     * Template code
+     *
+     * A template is just a JavaScript structure. An element is represented as:
+     *
+     * [tag_name, {attr_name:attr_value}, child1, child2]
+     *
+     * the children can either be strings (which act like text nodes), other templates or
+     * functions (see below)
+     *
+     * A text node is represented as
+     *
+     * ["{text}", value]
+     *
+     * String values have a simple substitution syntax; ${foo} represents a variable foo.
+     *
+     * It is possible to embed logic in templates by using a function in a place where a
+     * node would usually go. The function must either return part of a template or null.
+     *
+     * In cases where a set of nodes are required as output rather than a single node
+     * with children it is possible to just use a list
+     * [node1, node2, node3]
+     *
+     * Usage:
+     *
+     * render(template, substitutions) - take a template and an object mapping
+     * variable names to parameters and return either a DOM node or a list of DOM nodes
+     *
+     * substitute(template, substitutions) - take a template and variable mapping object,
+     * make the variable substitutions and return the substituted template
+     *
+     */
+
+    function is_single_node(template)
+    {
+        return typeof template[0] === "string";
+    }
+
+    function substitute(template, substitutions)
+    {
+        if (typeof template === "function") {
+            var replacement = template(substitutions);
+            if (!replacement) {
+                return null;
+            }
+
+            return substitute(replacement, substitutions);
+        }
+
+        if (is_single_node(template)) {
+            return substitute_single(template, substitutions);
+        }
+
+        return filter(map(template, function(x) {
+                              return substitute(x, substitutions);
+                          }), function(x) {return x !== null;});
+    }
+
+    function substitute_single(template, substitutions)
+    {
+        var substitution_re = /\$\{([^ }]*)\}/g;
+
+        function do_substitution(input) {
+            var components = input.split(substitution_re);
+            var rv = [];
+            for (var i = 0; i < components.length; i += 2) {
+                rv.push(components[i]);
+                if (components[i + 1]) {
+                    rv.push(String(substitutions[components[i + 1]]));
+                }
+            }
+            return rv;
+        }
+
+        function substitute_attrs(attrs, rv)
+        {
+            rv[1] = {};
+            for (var name in template[1]) {
+                if (attrs.hasOwnProperty(name)) {
+                    var new_name = do_substitution(name).join("");
+                    var new_value = do_substitution(attrs[name]).join("");
+                    rv[1][new_name] = new_value;
+                }
+            }
+        }
+
+        function substitute_children(children, rv)
+        {
+            for (var i = 0; i < children.length; i++) {
+                if (children[i] instanceof Object) {
+                    var replacement = substitute(children[i], substitutions);
+                    if (replacement !== null) {
+                        if (is_single_node(replacement)) {
+                            rv.push(replacement);
+                        } else {
+                            extend(rv, replacement);
+                        }
+                    }
+                } else {
+                    extend(rv, do_substitution(String(children[i])));
+                }
+            }
+            return rv;
+        }
+
+        var rv = [];
+        rv.push(do_substitution(String(template[0])).join(""));
+
+        if (template[0] === "{text}") {
+            substitute_children(template.slice(1), rv);
+        } else {
+            substitute_attrs(template[1], rv);
+            substitute_children(template.slice(2), rv);
+        }
+
+        return rv;
+    }
+
+    function make_dom_single(template, doc)
+    {
+        var output_document = doc || document;
+        var element;
+        if (template[0] === "{text}") {
+            element = output_document.createTextNode("");
+            for (var i = 1; i < template.length; i++) {
+                element.data += template[i];
+            }
+        } else {
+            element = output_document.createElementNS(xhtml_ns, template[0]);
+            for (var name in template[1]) {
+                if (template[1].hasOwnProperty(name)) {
+                    element.setAttribute(name, template[1][name]);
+                }
+            }
+            for (var i = 2; i < template.length; i++) {
+                if (template[i] instanceof Object) {
+                    var sub_element = make_dom(template[i]);
+                    element.appendChild(sub_element);
+                } else {
+                    var text_node = output_document.createTextNode(template[i]);
+                    element.appendChild(text_node);
+                }
+            }
+        }
+
+        return element;
+    }
+
+    function make_dom(template, substitutions, output_document)
+    {
+        if (is_single_node(template)) {
+            return make_dom_single(template, output_document);
+        }
+
+        return map(template, function(x) {
+                       return make_dom_single(x, output_document);
+                   });
+    }
+
+    function render(template, substitutions, output_document)
+    {
+        return make_dom(substitute(template, substitutions), output_document);
+    }
+
+    /*
+     * Utility functions
+     */
+    function assert(expected_true, function_name, description, error, substitutions)
+    {
+        if (expected_true !== true) {
+            var msg = make_message(function_name, description,
+                                   error, substitutions);
+            throw new AssertionError(msg);
+        }
+    }
+
+    /**
+     * @class
+     * Exception type that represents a failing assert.
+     *
+     * @param {string} message - Error message.
+     */
+    function AssertionError(message)
+    {
+        if (typeof message == "string") {
+            message = sanitize_unpaired_surrogates(message);
+        }
+        this.message = message;
+        this.stack = get_stack();
+    }
+    expose(AssertionError, "AssertionError");
+
+    AssertionError.prototype = Object.create(Error.prototype);
+
+    const get_stack = function() {
+        var stack = new Error().stack;
+
+        // 'Error.stack' is not supported in all browsers/versions
+        if (!stack) {
+            return "(Stack trace unavailable)";
+        }
+
+        var lines = stack.split("\n");
+
+        // Create a pattern to match stack frames originating within testharness.js.  These include the
+        // script URL, followed by the line/col (e.g., '/resources/testharness.js:120:21').
+        // Escape the URL per http://stackoverflow.com/questions/3561493/is-there-a-regexp-escape-function-in-javascript
+        // in case it contains RegExp characters.
+        var script_url = get_script_url();
+        var re_text = script_url ? script_url.replace(/[-\/\\^$*+?.()|[\]{}]/g, '\\$&') : "\\btestharness.js";
+        var re = new RegExp(re_text + ":\\d+:\\d+");
+
+        // Some browsers include a preamble that specifies the type of the error object.  Skip this by
+        // advancing until we find the first stack frame originating from testharness.js.
+        var i = 0;
+        while (!re.test(lines[i]) && i < lines.length) {
+            i++;
+        }
+
+        // Then skip the top frames originating from testharness.js to begin the stack at the test code.
+        while (re.test(lines[i]) && i < lines.length) {
+            i++;
+        }
+
+        // Paranoid check that we didn't skip all frames.  If so, return the original stack unmodified.
+        if (i >= lines.length) {
+            return stack;
+        }
+
+        return lines.slice(i).join("\n");
+    }
+
+    function OptionalFeatureUnsupportedError(message)
+    {
+        AssertionError.call(this, message);
+    }
+    OptionalFeatureUnsupportedError.prototype = Object.create(AssertionError.prototype);
+    expose(OptionalFeatureUnsupportedError, "OptionalFeatureUnsupportedError");
+
+    function make_message(function_name, description, error, substitutions)
+    {
+        for (var p in substitutions) {
+            if (substitutions.hasOwnProperty(p)) {
+                substitutions[p] = format_value(substitutions[p]);
+            }
+        }
+        var node_form = substitute(["{text}", "${function_name}: ${description}" + error],
+                                   merge({function_name:function_name,
+                                          description:(description?description + " ":"")},
+                                          substitutions));
+        return node_form.slice(1).join("");
+    }
+
+    function filter(array, callable, thisObj) {
+        var rv = [];
+        for (var i = 0; i < array.length; i++) {
+            if (array.hasOwnProperty(i)) {
+                var pass = callable.call(thisObj, array[i], i, array);
+                if (pass) {
+                    rv.push(array[i]);
+                }
+            }
+        }
+        return rv;
+    }
+
+    function map(array, callable, thisObj)
+    {
+        var rv = [];
+        rv.length = array.length;
+        for (var i = 0; i < array.length; i++) {
+            if (array.hasOwnProperty(i)) {
+                rv[i] = callable.call(thisObj, array[i], i, array);
+            }
+        }
+        return rv;
+    }
+
+    function extend(array, items)
+    {
+        Array.prototype.push.apply(array, items);
+    }
+
+    function forEach(array, callback, thisObj)
+    {
+        for (var i = 0; i < array.length; i++) {
+            if (array.hasOwnProperty(i)) {
+                callback.call(thisObj, array[i], i, array);
+            }
+        }
+    }
+
+    /**
+     * Immediately invoke a "iteratee" function with a series of values in
+     * parallel and invoke a final "done" function when all of the "iteratee"
+     * invocations have signaled completion.
+     *
+     * If all callbacks complete synchronously (or if no callbacks are
+     * specified), the ``done_callback`` will be invoked synchronously. It is the
+     * responsibility of the caller to ensure asynchronicity in cases where
+     * that is desired.
+     *
+     * @param {array} value Zero or more values to use in the invocation of
+     *                      ``iter_callback``
+     * @param {function} iter_callback A function that will be invoked
+     *                                 once for each of the values min
+     *                                 ``value``. Two arguments will
+     *                                 be available in each
+     *                                 invocation: the value from
+     *                                 ``value`` and a function that
+     *                                 must be invoked to signal
+     *                                 completion
+     * @param {function} done_callback A function that will be invoked after
+     *                                 all operations initiated by the
+     *                                 ``iter_callback`` function have signaled
+     *                                 completion
+     */
+    function all_async(values, iter_callback, done_callback)
+    {
+        var remaining = values.length;
+
+        if (remaining === 0) {
+            done_callback();
+        }
+
+        forEach(values,
+                function(element) {
+                    var invoked = false;
+                    var elDone = function() {
+                        if (invoked) {
+                            return;
+                        }
+
+                        invoked = true;
+                        remaining -= 1;
+
+                        if (remaining === 0) {
+                            done_callback();
+                        }
+                    };
+
+                    iter_callback(element, elDone);
+                });
+    }
+
+    function merge(a,b)
+    {
+        var rv = {};
+        var p;
+        for (p in a) {
+            rv[p] = a[p];
+        }
+        for (p in b) {
+            rv[p] = b[p];
+        }
+        return rv;
+    }
+
+    function expose(object, name)
+    {
+        var components = name.split(".");
+        var target = global_scope;
+        for (var i = 0; i < components.length - 1; i++) {
+            if (!(components[i] in target)) {
+                target[components[i]] = {};
+            }
+            target = target[components[i]];
+        }
+        target[components[components.length - 1]] = object;
+    }
+
+    function is_same_origin(w) {
+        try {
+            'random_prop' in w;
+            return true;
+        } catch (e) {
+            return false;
+        }
+    }
+
+    /** Returns the 'src' URL of the first <script> tag in the page to include the file 'testharness.js'. */
+    function get_script_url()
+    {
+        if (!('document' in global_scope)) {
+            return undefined;
+        }
+
+        var scripts = document.getElementsByTagName("script");
+        for (var i = 0; i < scripts.length; i++) {
+            var src;
+            if (scripts[i].src) {
+                src = scripts[i].src;
+            } else if (scripts[i].href) {
+                //SVG case
+                src = scripts[i].href.baseVal;
+            }
+
+            var matches = src && src.match(/^(.*\/|)testharness\.js$/);
+            if (matches) {
+                return src;
+            }
+        }
+        return undefined;
+    }
+
+    /** Returns the <title> or filename or "Untitled" */
+    function get_title()
+    {
+        if ('document' in global_scope) {
+            //Don't use document.title to work around an Opera/Presto bug in XHTML documents
+            var title = document.getElementsByTagName("title")[0];
+            if (title && title.firstChild && title.firstChild.data) {
+                return title.firstChild.data;
+            }
+        }
+        if ('META_TITLE' in global_scope && META_TITLE) {
+            return META_TITLE;
+        }
+        if ('location' in global_scope) {
+            return location.pathname.substring(location.pathname.lastIndexOf('/') + 1, location.pathname.indexOf('.'));
+        }
+        return "Untitled";
+    }
+
+    /**
+     * Setup globals
+     */
+
+    var tests = new Tests();
+
+    if (global_scope.addEventListener) {
+        var error_handler = function(error, message, stack) {
+            var optional_unsupported = error instanceof OptionalFeatureUnsupportedError;
+            if (tests.file_is_test) {
+                var test = tests.tests[0];
+                if (test.phase >= test.phases.HAS_RESULT) {
+                    return;
+                }
+                var status = optional_unsupported ? test.PRECONDITION_FAILED : test.FAIL;
+                test.set_status(status, message, stack);
+                test.phase = test.phases.HAS_RESULT;
+            } else if (!tests.allow_uncaught_exception) {
+                var status = optional_unsupported ? tests.status.PRECONDITION_FAILED : tests.status.ERROR;
+                tests.status.status = status;
+                tests.status.message = message;
+                tests.status.stack = stack;
+            }
+
+            // Do not transition to the "complete" phase if the test has been
+            // configured to allow uncaught exceptions. This gives the test an
+            // opportunity to define subtests based on the exception reporting
+            // behavior.
+            if (!tests.allow_uncaught_exception) {
+                done();
+            }
+        };
+
+        addEventListener("error", function(e) {
+            var message = e.message;
+            var stack;
+            if (e.error && e.error.stack) {
+                stack = e.error.stack;
+            } else {
+                stack = e.filename + ":" + e.lineno + ":" + e.colno;
+            }
+            error_handler(e.error, message, stack);
+        }, false);
+
+        addEventListener("unhandledrejection", function(e) {
+            var message;
+            if (e.reason && e.reason.message) {
+                message = "Unhandled rejection: " + e.reason.message;
+            } else {
+                message = "Unhandled rejection";
+            }
+            var stack;
+            if (e.reason && e.reason.stack) {
+                stack = e.reason.stack;
+            }
+            error_handler(e.reason, message, stack);
+        }, false);
+    }
+
+    test_environment.on_tests_ready();
+
+    /**
+     * Stylesheet
+     */
+     var stylesheetContent = "\
+html {\
+    font-family:DejaVu Sans, Bitstream Vera Sans, Arial, Sans;\
+}\
+\
+#log .warning,\
+#log .warning a {\
+  color: black;\
+  background: yellow;\
+}\
+\
+#log .error,\
+#log .error a {\
+  color: white;\
+  background: red;\
+}\
+\
+section#summary {\
+    margin-bottom:1em;\
+}\
+\
+table#results {\
+    border-collapse:collapse;\
+    table-layout:fixed;\
+    width:100%;\
+}\
+\
+table#results > thead > tr > th:first-child,\
+table#results > tbody > tr > td:first-child {\
+    width:8em;\
+}\
+\
+table#results > thead > tr > th:last-child,\
+table#results > thead > tr > td:last-child {\
+    width:50%;\
+}\
+\
+table#results.assertions > thead > tr > th:last-child,\
+table#results.assertions > tbody > tr > td:last-child {\
+    width:35%;\
+}\
+\
+table#results > thead > > tr > th {\
+    padding:0;\
+    padding-bottom:0.5em;\
+    border-bottom:medium solid black;\
+}\
+\
+table#results > tbody > tr> td {\
+    padding:1em;\
+    padding-bottom:0.5em;\
+    border-bottom:thin solid black;\
+}\
+\
+.pass {\
+    color:green;\
+}\
+\
+.fail {\
+    color:red;\
+}\
+\
+tr.timeout {\
+    color:red;\
+}\
+\
+tr.notrun {\
+    color:blue;\
+}\
+\
+tr.optionalunsupported {\
+    color:blue;\
+}\
+\
+.ok {\
+    color:green;\
+}\
+\
+.error {\
+    color:red;\
+}\
+\
+.pass, .fail, .timeout, .notrun, .optionalunsupported .ok, .timeout, .error {\
+    font-variant:small-caps;\
+}\
+\
+table#results span {\
+    display:block;\
+}\
+\
+table#results span.expected {\
+    font-family:DejaVu Sans Mono, Bitstream Vera Sans Mono, Monospace;\
+    white-space:pre;\
+}\
+\
+table#results span.actual {\
+    font-family:DejaVu Sans Mono, Bitstream Vera Sans Mono, Monospace;\
+    white-space:pre;\
+}\
+";
+
+})(self);
+// vim: set expandtab shiftwidth=4 tabstop=4:
diff --git a/test/wpt/tests/resources/testharness.js.headers b/test/wpt/tests/resources/testharness.js.headers
new file mode 100644
index 00000000000..5e8f640c665
--- /dev/null
+++ b/test/wpt/tests/resources/testharness.js.headers
@@ -0,0 +1,2 @@
+Content-Type: text/javascript; charset=utf-8
+Cache-Control: max-age=3600
diff --git a/test/wpt/tests/resources/testharnessreport.js b/test/wpt/tests/resources/testharnessreport.js
new file mode 100644
index 00000000000..e5cb40fe0ef
--- /dev/null
+++ b/test/wpt/tests/resources/testharnessreport.js
@@ -0,0 +1,57 @@
+/* global add_completion_callback */
+/* global setup */
+
+/*
+ * This file is intended for vendors to implement code needed to integrate
+ * testharness.js tests with their own test systems.
+ *
+ * Typically test system integration will attach callbacks when each test has
+ * run, using add_result_callback(callback(test)), or when the whole test file
+ * has completed, using
+ * add_completion_callback(callback(tests, harness_status)).
+ *
+ * For more documentation about the callback functions and the
+ * parameters they are called with see testharness.js
+ */
+
+function dump_test_results(tests, status) {
+    var results_element = document.createElement("script");
+    results_element.type = "text/json";
+    results_element.id = "__testharness__results__";
+    var test_results = tests.map(function(x) {
+        return {name:x.name, status:x.status, message:x.message, stack:x.stack}
+    });
+    var data = {test:window.location.href,
+                tests:test_results,
+                status: status.status,
+                message: status.message,
+                stack: status.stack};
+    results_element.textContent = JSON.stringify(data);
+
+    // To avoid a HierarchyRequestError with XML documents, ensure that 'results_element'
+    // is inserted at a location that results in a valid document.
+    var parent = document.body
+        ? document.body                 // <body> is required in XHTML documents
+        : document.documentElement;     // fallback for optional <body> in HTML5, SVG, etc.
+
+    parent.appendChild(results_element);
+}
+
+add_completion_callback(dump_test_results);
+
+/* If the parent window has a testharness_properties object,
+ * we use this to provide the test settings. This is used by the
+ * default in-browser runner to configure the timeout and the
+ * rendering of results
+ */
+try {
+    if (window.opener && "testharness_properties" in window.opener) {
+        /* If we pass the testharness_properties object as-is here without
+         * JSON stringifying and reparsing it, IE fails & emits the message
+         * "Could not complete the operation due to error 80700019".
+         */
+        setup(JSON.parse(JSON.stringify(window.opener.testharness_properties)));
+    }
+} catch (e) {
+}
+// vim: set expandtab shiftwidth=4 tabstop=4:
diff --git a/test/wpt/tests/resources/testharnessreport.js.headers b/test/wpt/tests/resources/testharnessreport.js.headers
new file mode 100644
index 00000000000..5e8f640c665
--- /dev/null
+++ b/test/wpt/tests/resources/testharnessreport.js.headers
@@ -0,0 +1,2 @@
+Content-Type: text/javascript; charset=utf-8
+Cache-Control: max-age=3600
diff --git a/test/wpt/tests/resources/webidl2/build.sh b/test/wpt/tests/resources/webidl2/build.sh
new file mode 100644
index 00000000000..a631268224f
--- /dev/null
+++ b/test/wpt/tests/resources/webidl2/build.sh
@@ -0,0 +1,12 @@
+set -ex
+
+if [ ! -d "webidl2.js" ]; then
+  git clone https://github.com/w3c/webidl2.js.git
+fi
+cd webidl2.js
+npm install
+npm run build-debug
+HASH=$(git rev-parse HEAD)
+cd ..
+cp webidl2.js/dist/webidl2.js lib/
+echo "Currently using webidl2.js@${HASH}." > lib/VERSION.md
diff --git a/test/wpt/tests/resources/webidl2/lib/README.md b/test/wpt/tests/resources/webidl2/lib/README.md
new file mode 100644
index 00000000000..1bd583269d2
--- /dev/null
+++ b/test/wpt/tests/resources/webidl2/lib/README.md
@@ -0,0 +1,4 @@
+This directory contains a built version of the [webidl2.js library](https://github.com/w3c/webidl2.js).
+It is built by running `npm run build-debug` at the root of that repository.
+
+The `webidl2.js.headers` file is a local addition to ensure the script is interpreted as UTF-8.
diff --git a/test/wpt/tests/resources/webidl2/lib/VERSION.md b/test/wpt/tests/resources/webidl2/lib/VERSION.md
new file mode 100644
index 00000000000..5a3726c6c00
--- /dev/null
+++ b/test/wpt/tests/resources/webidl2/lib/VERSION.md
@@ -0,0 +1 @@
+Currently using webidl2.js@6889aee6fc7d65915ab1267825248157dbc50486.
diff --git a/test/wpt/tests/resources/webidl2/lib/webidl2.js.headers b/test/wpt/tests/resources/webidl2/lib/webidl2.js.headers
new file mode 100644
index 00000000000..6805c323df5
--- /dev/null
+++ b/test/wpt/tests/resources/webidl2/lib/webidl2.js.headers
@@ -0,0 +1 @@
+Content-Type: text/javascript; charset=utf-8
diff --git a/test/wpt/tests/websockets/META.yml b/test/wpt/tests/websockets/META.yml
new file mode 100644
index 00000000000..da999b994f3
--- /dev/null
+++ b/test/wpt/tests/websockets/META.yml
@@ -0,0 +1,6 @@
+spec: https://websockets.spec.whatwg.org/
+suggested_reviewers:
+  - jdm
+  - ricea
+  - yutakahirano
+  - zqzhang
diff --git a/test/wpt/tests/websockets/README.md b/test/wpt/tests/websockets/README.md
new file mode 100644
index 00000000000..ea35c702ae7
--- /dev/null
+++ b/test/wpt/tests/websockets/README.md
@@ -0,0 +1 @@
+Tests for the [WebSockets Standard](https://websockets.spec.whatwg.org/).
diff --git a/test/wpt/tests/websockets/Send-data.worker.js b/test/wpt/tests/websockets/Send-data.worker.js
new file mode 100644
index 00000000000..b141fb38207
--- /dev/null
+++ b/test/wpt/tests/websockets/Send-data.worker.js
@@ -0,0 +1,26 @@
+// META: variant=
+// META: variant=?wss
+// META: variant=?wpt_flags=h2
+
+importScripts("/resources/testharness.js");
+importScripts('constants.sub.js')
+
+var data = "test data";
+
+async_test(function(t) {
+
+    var wsocket = CreateWebSocket(false, false);
+
+    wsocket.addEventListener('open', function (e) {
+        wsocket.send(data)
+    }, true)
+
+    wsocket.addEventListener('message', t.step_func_done(function(e) {
+            assert_equals(e.data, data);
+    }), true);
+
+    wsocket.addEventListener('close', t.unreached_func('the close event should not fire'), true);
+
+}, "Send data on a WebSocket in a Worker")
+
+done();
diff --git a/test/wpt/tests/websockets/binary/001.html b/test/wpt/tests/websockets/binary/001.html
new file mode 100644
index 00000000000..21ffff40eb0
--- /dev/null
+++ b/test/wpt/tests/websockets/binary/001.html
@@ -0,0 +1,27 @@
+<!doctype html>
+<title>WebSockets: Send/Receive blob, blob size less than network array buffer</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=../constants.sub.js></script>
+<meta name="variant" content="">
+<meta name="variant" content="?wss">
+<meta name="variant" content="?wpt_flags=h2">
+<div id=log></div>
+<script>
+async_test(function(t){
+  var ws = new WebSocket(SCHEME_DOMAIN_PORT + '/echo');
+  var data = "";
+  var datasize = 10;
+  ws.onopen = t.step_func(function(e) {
+   ws.binaryType = "blob";
+   data = new ArrayBuffer(datasize);
+   ws.send(data);
+  })
+  ws.onmessage = t.step_func(function(e) {
+    assert_true(e.data instanceof Blob);
+    assert_equals(e.data.size, datasize);
+    t.done();
+  })
+  ws.onclose = t.unreached_func('close event should not fire');
+});
+</script>
diff --git a/test/wpt/tests/websockets/binary/002.html b/test/wpt/tests/websockets/binary/002.html
new file mode 100644
index 00000000000..ffd1ee7a7a2
--- /dev/null
+++ b/test/wpt/tests/websockets/binary/002.html
@@ -0,0 +1,28 @@
+<!doctype html>
+<title>WebSockets: Send/Receive blob, blob size greater than network array buffer</title>
+<meta name=timeout content=long>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=../constants.sub.js></script>
+<meta name="variant" content="">
+<meta name="variant" content="?wss">
+<meta name="variant" content="?wpt_flags=h2">
+<div id=log></div>
+<script>
+async_test(function(t){
+  var ws = new WebSocket(SCHEME_DOMAIN_PORT+'/echo');
+  var data = "";
+  var datasize = 100000;
+  ws.onopen = t.step_func(function(e) {
+   ws.binaryType = "blob";
+   data = new ArrayBuffer(datasize);
+   ws.send(data);
+  });
+  ws.onmessage = t.step_func(function(e) {
+    assert_true(e.data instanceof Blob);
+    assert_equals(e.data.size, datasize);
+    t.done();
+  });
+  ws.onclose = t.unreached_func('close event should not fire');
+});
+</script>
diff --git a/test/wpt/tests/websockets/binary/004.html b/test/wpt/tests/websockets/binary/004.html
new file mode 100644
index 00000000000..76bb902cf95
--- /dev/null
+++ b/test/wpt/tests/websockets/binary/004.html
@@ -0,0 +1,27 @@
+<!doctype html>
+<title>WebSockets: Send/Receive ArrayBuffer, size greater than network array buffer</title>
+<meta name=timeout content=long>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=../constants.sub.js></script>
+<meta name="variant" content="">
+<meta name="variant" content="?wss">
+<meta name="variant" content="?wpt_flags=h2">
+<div id=log></div>
+<script>
+async_test(function(t){
+  var ws = new WebSocket(SCHEME_DOMAIN_PORT+'/echo');
+  var data = "";
+  var datasize = 100000;
+  ws.onopen = t.step_func(function(e) {
+   ws.binaryType = "arraybuffer";
+   data = new ArrayBuffer(datasize);
+   ws.send(data);
+  })
+  ws.onmessage = t.step_func(function(e) {
+    assert_equals(e.data.byteLength, datasize);
+    t.done();
+  })
+  ws.onclose = t.unreached_func('close event should not fire');
+});
+</script>
diff --git a/test/wpt/tests/websockets/binary/005.html b/test/wpt/tests/websockets/binary/005.html
new file mode 100644
index 00000000000..9b8b2c4edfd
--- /dev/null
+++ b/test/wpt/tests/websockets/binary/005.html
@@ -0,0 +1,26 @@
+<!doctype html>
+<title>WebSockets: Send/Receive ArrayBuffer, size less than network array buffer</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=../constants.sub.js></script>
+<meta name="variant" content="">
+<meta name="variant" content="?wss">
+<meta name="variant" content="?wpt_flags=h2">
+<div id=log></div>
+<script>
+async_test(function(t){
+  var ws = new WebSocket(SCHEME_DOMAIN_PORT+'/echo');
+  var data = "";
+  var datasize = 10;
+  ws.onopen = t.step_func(function(e) {
+   ws.binaryType = "arraybuffer";
+   data = new ArrayBuffer(datasize);
+   ws.send(data);
+  });
+  ws.onmessage = t.step_func(function(e) {
+    assert_equals(e.data.byteLength, datasize);
+    t.done();
+  });
+  ws.onclose = t.unreached_func('close event should not fire');
+ });
+</script>
diff --git a/test/wpt/tests/websockets/closing-handshake/002.html b/test/wpt/tests/websockets/closing-handshake/002.html
new file mode 100644
index 00000000000..b0e39a955ce
--- /dev/null
+++ b/test/wpt/tests/websockets/closing-handshake/002.html
@@ -0,0 +1,23 @@
+<!doctype html>
+<title>WebSockets: server sends closing handshake</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=../constants.sub.js></script>
+<meta name="variant" content="">
+<meta name="variant" content="?wss">
+<meta name="variant" content="?wpt_flags=h2">
+<div id=log></div>
+<script>
+async_test(function(t){
+  var ws = new WebSocket(SCHEME_DOMAIN_PORT+'/echo_exit');
+  ws.onmessage = ws.onerror = t.unreached_func();
+  ws.onopen = t.step_func(function(e) {
+    ws.send('Goodbye');
+  })
+  ws.onclose = t.step_func(function(e) {
+    assert_equals(e.wasClean, true, 'e.wasClean');
+    ws.onclose = t.unreached_func();
+    t.step_timeout(() => t.done(), 50);
+  });
+});
+</script>
diff --git a/test/wpt/tests/websockets/closing-handshake/003.html b/test/wpt/tests/websockets/closing-handshake/003.html
new file mode 100644
index 00000000000..72eb09d8337
--- /dev/null
+++ b/test/wpt/tests/websockets/closing-handshake/003.html
@@ -0,0 +1,24 @@
+<!doctype html>
+<title>WebSockets: client sends closing handshake</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=../constants.sub.js></script>
+<meta name="variant" content="">
+<meta name="variant" content="?wss">
+<meta name="variant" content="?wpt_flags=h2">
+<div id=log></div>
+<script>
+async_test(function(t) {
+  var ws = new WebSocket(SCHEME_DOMAIN_PORT + '/echo');
+  ws.onmessage = ws.onerror = t.unreached_func();
+  ws.onopen = t.step_func(function(e) {
+    ws.close();
+  });
+  ws.onclose = t.step_func(function(e) {
+    assert_equals(e.code, 1005, 'e.code');
+    assert_equals(e.wasClean, true, 'e.wasClean');
+    ws.onclose = t.unreached_func();
+    t.step_timeout(() => t.done(), 50);
+  });
+});
+</script>
diff --git a/test/wpt/tests/websockets/closing-handshake/004.html b/test/wpt/tests/websockets/closing-handshake/004.html
new file mode 100644
index 00000000000..eb89ad33857
--- /dev/null
+++ b/test/wpt/tests/websockets/closing-handshake/004.html
@@ -0,0 +1,25 @@
+<!doctype html>
+<title>WebSockets: data after closing handshake</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=../constants.sub.js></script>
+<meta name="variant" content="">
+<meta name="variant" content="?wss">
+<meta name="variant" content="?wpt_flags=h2">
+<div id=log></div>
+<script>
+async_test(function(t) {
+  var ws = new WebSocket(SCHEME_DOMAIN_PORT+'/echo_close_data');
+  ws.onmessage = ws.onerror = t.unreached_func();
+
+  ws.onopen = t.step_func(function(e) {
+    ws.send('Goodbye');
+  })
+
+  ws.onclose = t.step_func(function(e) {
+    assert_equals(e.wasClean, true);
+    ws.onclose = t.unreached_func();
+    t.step_timeout(() => t.done(), 50);
+  })
+});
+</script>
diff --git a/test/wpt/tests/websockets/constructor/001.html b/test/wpt/tests/websockets/constructor/001.html
new file mode 100644
index 00000000000..0c39a0ee71b
--- /dev/null
+++ b/test/wpt/tests/websockets/constructor/001.html
@@ -0,0 +1,14 @@
+<!doctype html>
+<title>WebSockets: new WebSocket() with no args</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=../constants.sub.js></script>
+<meta name="variant" content="">
+<meta name="variant" content="?wss">
+<meta name="variant" content="?wpt_flags=h2">
+<div id=log></div>
+<script>
+test(function() {
+  assert_throws_js(TypeError, function(){new WebSocket()});
+});
+</script>
diff --git a/test/wpt/tests/websockets/constructor/002.html b/test/wpt/tests/websockets/constructor/002.html
new file mode 100644
index 00000000000..8c80c23735f
--- /dev/null
+++ b/test/wpt/tests/websockets/constructor/002.html
@@ -0,0 +1,21 @@
+<!doctype html>
+<title>WebSockets: new WebSocket(invalid url)</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=../constants.sub.js></script>
+<meta name="variant" content="">
+<meta name="variant" content="?wss">
+<meta name="variant" content="?wpt_flags=h2">
+<div id=log></div>
+<script>
+test(function() {assert_throws_dom("SyntaxError", function(){new WebSocket("/test")})});
+test(function() {assert_throws_dom("SyntaxError", function(){new WebSocket("ws://foo bar.com/")})});
+test(function() {assert_throws_dom("SyntaxError", function(){new WebSocket("wss://foo bar.com/")})});
+test(function() {assert_throws_dom("SyntaxError", function(){new WebSocket("http://"+location.host+"/")})});
+test(function() {assert_throws_dom("SyntaxError", function(){new WebSocket("mailto:example@example.org")})});
+test(function() {assert_throws_dom("SyntaxError", function(){new WebSocket("about:blank")})});
+test(function() {assert_throws_dom("SyntaxError", function(){new WebSocket(SCHEME_DOMAIN_PORT+"/#")})});
+test(function() {assert_throws_dom("SyntaxError", function(){new WebSocket(SCHEME_DOMAIN_PORT+"/#test")})});
+test(function() {assert_throws_dom("SyntaxError", function(){new WebSocket("?test")})});
+test(function() {assert_throws_dom("SyntaxError", function(){new WebSocket("#test")})});
+</script>
diff --git a/test/wpt/tests/websockets/constructor/004.html b/test/wpt/tests/websockets/constructor/004.html
new file mode 100644
index 00000000000..e599bf224ae
--- /dev/null
+++ b/test/wpt/tests/websockets/constructor/004.html
@@ -0,0 +1,36 @@
+<!doctype html>
+<title>WebSockets: new WebSocket(url, invalid protocol)</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=../constants.sub.js></script>
+<meta name="variant" content="">
+<meta name="variant" content="?wss">
+<meta name="variant" content="?wpt_flags=h2">
+<div id=log></div>
+<script>
+// empty string
+test(function() {
+  assert_throws_dom("SyntaxError", function() {
+    new WebSocket(SCHEME_DOMAIN_PORT + '/empty-message', "")
+  })
+});
+
+// chars below U+0020 except U+0000; U+0000 is tested in a separate test
+for (var i = 1; i < 0x20; ++i) {
+  test(function() {
+    assert_throws_dom("SyntaxError", function() {
+      new WebSocket(SCHEME_DOMAIN_PORT + '/empty-message',
+                    "a"+String.fromCharCode(i)+"b")
+    }, 'char code '+i);
+  })
+}
+// some chars above U+007E
+for (var i = 0x7F; i < 0x100; ++i) {
+  test(function() {
+    assert_throws_dom("SyntaxError", function() {
+      new WebSocket(SCHEME_DOMAIN_PORT + '/empty-message',
+                    "a"+String.fromCharCode(i)+"b")
+    }, 'char code '+i);
+  })
+}
+</script>
diff --git a/test/wpt/tests/websockets/constructor/005.html b/test/wpt/tests/websockets/constructor/005.html
new file mode 100644
index 00000000000..377d9c4217a
--- /dev/null
+++ b/test/wpt/tests/websockets/constructor/005.html
@@ -0,0 +1,14 @@
+<!doctype html>
+<title>WebSockets: return value</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=../constants.sub.js></script>
+<meta name="variant" content="">
+<meta name="variant" content="?wss">
+<meta name="variant" content="?wpt_flags=h2">
+<div id=log></div>
+<script>
+test(function() {
+  assert_true(new WebSocket(SCHEME_DOMAIN_PORT + '/empty-message') instanceof WebSocket);
+});
+</script>
diff --git a/test/wpt/tests/websockets/constructor/006.html b/test/wpt/tests/websockets/constructor/006.html
new file mode 100644
index 00000000000..65178e00165
--- /dev/null
+++ b/test/wpt/tests/websockets/constructor/006.html
@@ -0,0 +1,29 @@
+<!doctype html>
+<title>WebSockets: converting first arguments</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=../constants.sub.js></script>
+<meta name="variant" content="">
+<meta name="variant" content="?wss">
+<meta name="variant" content="?wpt_flags=h2">
+<div id=log></div>
+<script>
+async_test(function(t) {
+  var a = document.createElement('a');
+  a.href = SCHEME_DOMAIN_PORT+'/echo';
+  var ws = new WebSocket(a); // should stringify arguments; <a> stringifies to its .href
+  assert_equals(ws.url, a.href);
+  ws.onopen = t.step_func(function(e) {
+    ws.send('test');
+  });
+  ws.onmessage = t.step_func(function(e) {
+    assert_equals(e.data, 'test');
+    ws.onclose = t.step_func(function(e) {
+      ws.onclose = t.unreached_func();
+      t.step_timeout(() => t.done(), 50);
+    });
+    ws.close();
+  });
+  ws.onerror = ws.onclose = t.unreached_func();
+});
+</script>
diff --git a/test/wpt/tests/websockets/constructor/007.html b/test/wpt/tests/websockets/constructor/007.html
new file mode 100644
index 00000000000..647f4202a17
--- /dev/null
+++ b/test/wpt/tests/websockets/constructor/007.html
@@ -0,0 +1,17 @@
+<!doctype html>
+<title>WebSockets: new WebSocket(url, null char)</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=../constants.sub.js></script>
+<meta name="variant" content="">
+<meta name="variant" content="?wss">
+<meta name="variant" content="?wpt_flags=h2">
+<div id=log></div>
+<script>
+test(function() {
+  assert_throws_dom("SyntaxError", function() {
+    new WebSocket(SCHEME_DOMAIN_PORT + '/empty-message',
+                  'a' + String.fromCharCode(0) + 'b')
+  })
+});
+</script>
diff --git a/test/wpt/tests/websockets/constructor/008.html b/test/wpt/tests/websockets/constructor/008.html
new file mode 100644
index 00000000000..de7fb457bae
--- /dev/null
+++ b/test/wpt/tests/websockets/constructor/008.html
@@ -0,0 +1,15 @@
+<!doctype html>
+<title>WebSockets: new WebSocket(url with not blocked port)</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=../constants.sub.js></script>
+<meta name="variant" content="">
+<meta name="variant" content="?wss">
+<div id=log></div>
+<script>
+//Pass condition is to not throw
+test(function(){new WebSocket('ws://example.invalid:80/')});
+test(function(){new WebSocket('ws://example.invalid:443/')});
+test(function(){new WebSocket('wss://example.invalid:80/')});
+test(function(){new WebSocket('wss://example.invalid:443/')});
+</script>
diff --git a/test/wpt/tests/websockets/constructor/009.html b/test/wpt/tests/websockets/constructor/009.html
new file mode 100644
index 00000000000..4e69a839ebd
--- /dev/null
+++ b/test/wpt/tests/websockets/constructor/009.html
@@ -0,0 +1,24 @@
+<!doctype html>
+<title>WebSockets: protocol</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=../constants.sub.js></script>
+<meta name="variant" content="">
+<meta name="variant" content="?wss">
+<meta name="variant" content="?wpt_flags=h2">
+<div id=log></div>
+<script>
+async_test(function(t) {
+  var ws = new WebSocket(SCHEME_DOMAIN_PORT+'/protocol', 'foobar');
+
+  ws.onmessage = t.step_func(function(e) {
+    assert_equals(ws.protocol, 'foobar');
+    ws.onclose = t.step_func(function(e) {
+      ws.onclose = t.unreached_func();
+      t.step_timeout(() => t.done(), 50);
+    })
+    ws.close();
+  })
+  ws.onerror = t.unreached_func();
+});
+</script>
diff --git a/test/wpt/tests/websockets/constructor/010.html b/test/wpt/tests/websockets/constructor/010.html
new file mode 100644
index 00000000000..0adf2b13f9b
--- /dev/null
+++ b/test/wpt/tests/websockets/constructor/010.html
@@ -0,0 +1,22 @@
+<!doctype html>
+<title>WebSockets: protocol in response but no requested protocol</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=../constants.sub.js></script>
+<meta name="variant" content="">
+<meta name="variant" content="?wss">
+<meta name="variant" content="?wpt_flags=h2">
+<div id=log></div>
+<script>
+async_test(function(t) {
+  var ws = new WebSocket(SCHEME_DOMAIN_PORT+'/handshake_protocol');
+  ws.onopen = ws.onmessage = ws.onclose = t.step_func(e => assert_unreached(e.type));
+  ws.onerror = t.step_func(function(e) {
+    ws.onclose = t.step_func(function(e) {
+      assert_false(e.wasClean, 'e.wasClean should be false');
+      assert_equals(e.code, 1006, 'e.code should be 1006');
+      t.done();
+    });
+  })
+});
+</script>
diff --git a/test/wpt/tests/websockets/constructor/011.html b/test/wpt/tests/websockets/constructor/011.html
new file mode 100644
index 00000000000..9b7f114dc03
--- /dev/null
+++ b/test/wpt/tests/websockets/constructor/011.html
@@ -0,0 +1,28 @@
+<!doctype html>
+<title>WebSockets: protocol mismatch</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=../constants.sub.js></script>
+<meta name="variant" content="">
+<meta name="variant" content="?wss">
+<meta name="variant" content="?wpt_flags=h2">
+<div id=log></div>
+<script>
+async_test(function(t) {
+  // Sub-protocol matching is case-sensitive.
+  var ws = new WebSocket(SCHEME_DOMAIN_PORT+'/handshake_protocol', 'FOOBAR');
+  var gotOpen = false;
+  var gotError = false;
+  ws.onopen = t.step_func(function(e) {
+    gotOpen = true;
+  });
+  ws.onerror = t.step_func(function(e) {
+    gotError = true;
+  });
+  ws.onclose = t.step_func(function(e) {
+    assert_false(gotOpen, 'got open');
+    assert_true(gotError, 'got error');
+    t.done();
+  });
+});
+</script>
diff --git a/test/wpt/tests/websockets/constructor/012.html b/test/wpt/tests/websockets/constructor/012.html
new file mode 100644
index 00000000000..34723616728
--- /dev/null
+++ b/test/wpt/tests/websockets/constructor/012.html
@@ -0,0 +1,20 @@
+<!doctype html>
+<title>WebSockets: no protocol in response</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=../constants.sub.js></script>
+<meta name="variant" content="">
+<meta name="variant" content="?wss">
+<meta name="variant" content="?wpt_flags=h2">
+<div id=log></div>
+<script>
+async_test(function(t) {
+  var ws = new WebSocket(SCHEME_DOMAIN_PORT+'/handshake_no_protocol', 'foobar');
+  ws.onclose = t.step_func(function(e) {
+    ws.onclose = t.unreached_func();
+    t.step_timeout(() => t.done(), 50);
+  })
+  ws.onmessage = t.unreached_func();
+});
+</script>
+
diff --git a/test/wpt/tests/websockets/constructor/013.html b/test/wpt/tests/websockets/constructor/013.html
new file mode 100644
index 00000000000..53b0400a2d6
--- /dev/null
+++ b/test/wpt/tests/websockets/constructor/013.html
@@ -0,0 +1,42 @@
+<!doctype html>
+<title>WebSockets: multiple WebSocket objects</title>
+<meta name=timeout content=long>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=../constants.sub.js></script>
+<meta name="variant" content="">
+<meta name="variant" content="?wss">
+<meta name="variant" content="?wpt_flags=h2">
+<div id=log></div>
+<script>
+async_test(function(t) {
+  // test that the events are fired as they should when opening 25 websockets and
+  // sending a message on each and then closing when getting the message back
+  var ws = [];
+  var events = 0;
+  for (var i = 0; i < 25; ++i) {
+    ws[i] = new WebSocket(SCHEME_DOMAIN_PORT+'/echo');
+    ws[i].id = i;
+    ws[i].onopen = t.step_func(function(e) {
+      events++;
+      this.send(this.id);
+      this.onopen = t.step_func(function() {assert_unreached()});
+    }, ws[i]);
+    ws[i].onmessage = t.step_func(function(e) {
+      events++;
+      assert_equals(e.data, ''+this.id);
+      this.close();
+      this.onmessage = t.step_func(function() {assert_unreached()});
+    }, ws[i]);
+    ws[i].onclose = t.step_func(function(e) {
+      events++;
+      if (events == 75) {
+        t.done();
+      }
+      this.onclose = t.step_func(function() {assert_unreached()});
+    }, ws[i]);
+    ws[i].onerror = t.step_func(function() {assert_unreached()});
+  }
+});
+</script>
+
diff --git a/test/wpt/tests/websockets/constructor/014.html b/test/wpt/tests/websockets/constructor/014.html
new file mode 100644
index 00000000000..f3f38ad2788
--- /dev/null
+++ b/test/wpt/tests/websockets/constructor/014.html
@@ -0,0 +1,39 @@
+<!doctype html>
+<title>WebSockets: serialize establish a connection</title>
+<meta name="timeout" content="long">
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=../constants.sub.js></script>
+<meta name="variant" content="">
+<meta name="variant" content="?wss">
+<div id=log></div>
+<script>
+
+async_test(function(t) {
+  var ws = [];
+  var events = 0;
+  var prevDate;
+  var date;
+  for (var i = 0; i < 2; ++i) {
+    ws[i] = new WebSocket(SCHEME_DOMAIN_PORT+'/handshake_sleep_2');
+    ws[i].id = i;
+    ws[i].onopen = t.step_func(function(e) {
+      events++;
+      date = new Date();
+      if (prevDate) {
+        assert_greater_than(date - prevDate, 1000);
+      }
+      prevDate = date;
+      this.onopen = t.step_func(function() {assert_unreached()});
+    }.bind(ws[i]))
+    ws[i].onclose = t.step_func(function() {
+      events++;
+      if (events == 4) {
+        t.done();
+      }
+      this.onclose = t.step_func(function() {assert_unreached()});
+    }.bind(ws[i]));
+    ws[i].onerror = ws[i].onmessage = t.step_func(function() {assert_unreached()});
+  }
+});
+</script>
diff --git a/test/wpt/tests/websockets/constructor/016.html b/test/wpt/tests/websockets/constructor/016.html
new file mode 100644
index 00000000000..7a5c9a9e072
--- /dev/null
+++ b/test/wpt/tests/websockets/constructor/016.html
@@ -0,0 +1,20 @@
+<!doctype html>
+<meta charset=windows-1252>
+<title>WebSockets: non-ascii URL in query, document encoding windows-1252</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=../constants.sub.js></script>
+<meta name="variant" content="">
+<meta name="variant" content="?wss">
+<meta name="variant" content="?wpt_flags=h2">
+<div id=log></div>
+<script>
+async_test(function(t) {
+  var ws = new WebSocket(SCHEME_DOMAIN_PORT+'/echo-query_v13?���');
+  ws.onclose = t.step_func(function() {assert_unreached()});
+  ws.onmessage = t.step_func(function(e) {
+    assert_equals(e.data, '%C3%A5%C3%A4%C3%B6');
+    t.done();
+  });
+});
+</script>
diff --git a/test/wpt/tests/websockets/constructor/017.html b/test/wpt/tests/websockets/constructor/017.html
new file mode 100644
index 00000000000..5087290f3ca
--- /dev/null
+++ b/test/wpt/tests/websockets/constructor/017.html
@@ -0,0 +1,19 @@
+<!doctype html>
+<title>WebSockets: too few slashes after ws: and wss:</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=../constants.sub.js></script>
+<meta name="variant" content="">
+<meta name="variant" content="?wss">
+<meta name="variant" content="?wpt_flags=h2">
+<div id=log></div>
+<script>
+var tests = [
+  [__SCHEME + ':', __PORT],
+  [__SCHEME + ':/', __PORT],
+];
+//Pass condition is to not throw
+for (var i = 0; i < tests.length; ++i) {
+  test(function(){new WebSocket(tests[i][0] + location.hostname + ':' + tests[i][1] + '/echo')}, tests[i][0]);
+}
+</script>
diff --git a/test/wpt/tests/websockets/constructor/018.html b/test/wpt/tests/websockets/constructor/018.html
new file mode 100644
index 00000000000..f4d6ab30d95
--- /dev/null
+++ b/test/wpt/tests/websockets/constructor/018.html
@@ -0,0 +1,20 @@
+<!doctype html>
+<title>WebSockets: NULL char in url</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=../constants.sub.js></script>
+<meta name="variant" content="">
+<meta name="variant" content="?wss">
+<meta name="variant" content="?wpt_flags=h2">
+<div id=log></div>
+<script>
+async_test(function(t) {
+  var ws = new WebSocket(SCHEME_DOMAIN_PORT+'/echo-query?x\u0000y\u0000');
+  ws.onmessage = t.step_func(function(e) {
+    assert_equals(e.data, 'x%00y');
+    ws.close();
+    t.done();
+  })
+  ws.onclose = ws.onerror = t.step_func(function(e) {assert_unreached(e.type)});
+});
+</script>
diff --git a/test/wpt/tests/websockets/constructor/019.html b/test/wpt/tests/websockets/constructor/019.html
new file mode 100644
index 00000000000..a0ec6c3ad78
--- /dev/null
+++ b/test/wpt/tests/websockets/constructor/019.html
@@ -0,0 +1,21 @@
+<!doctype html>
+<title>WebSockets: uppercase 'WS:'</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=../constants.sub.js></script>
+<meta name="variant" content="">
+<meta name="variant" content="?wss">
+<meta name="variant" content="?wpt_flags=h2">
+<div id=log></div>
+<script>
+async_test(function(t) {
+  var scheme = SCHEME_DOMAIN_PORT.split('://')[0];
+  var domain = SCHEME_DOMAIN_PORT.split('://')[1];
+  var ws = new WebSocket(scheme.toUpperCase()+'://'+domain+'/echo');
+  ws.onopen = t.step_func(function(e) {
+    ws.close();
+    t.done();
+  })
+  ws.onclose = ws.onerror = ws.onmessage = t.step_func(function() {assert_unreached()});
+});
+</script>
diff --git a/test/wpt/tests/websockets/constructor/020.html b/test/wpt/tests/websockets/constructor/020.html
new file mode 100644
index 00000000000..f050a1b8fa9
--- /dev/null
+++ b/test/wpt/tests/websockets/constructor/020.html
@@ -0,0 +1,21 @@
+<!doctype html>
+<title>WebSockets: uppercase host</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=../constants.sub.js></script>
+<meta name="variant" content="">
+<meta name="variant" content="?wss">
+<meta name="variant" content="?wpt_flags=h2">
+<div id=log></div>
+<script>
+async_test(function(t) {
+  var scheme = SCHEME_DOMAIN_PORT.split('://')[0];
+  var domain = SCHEME_DOMAIN_PORT.split('://')[1];
+  var ws = new WebSocket(scheme+'://'+domain.toUpperCase()+'/echo');
+  ws.onopen = t.step_func(function(e) {
+    ws.close();
+    t.done();
+  });
+  ws.onclose = ws.onerror = ws.onmessage = t.step_func(function() {assert_unreached()});
+});
+</script>
diff --git a/test/wpt/tests/websockets/constructor/021.html b/test/wpt/tests/websockets/constructor/021.html
new file mode 100644
index 00000000000..039d74b0430
--- /dev/null
+++ b/test/wpt/tests/websockets/constructor/021.html
@@ -0,0 +1,12 @@
+<!doctype html>
+<title>WebSockets: Same sub protocol twice</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=../constants.sub.js></script>
+<meta name="variant" content="">
+<meta name="variant" content="?wss">
+<meta name="variant" content="?wpt_flags=h2">
+<div id=log></div>
+<script>
+test(function() {assert_throws_dom("SyntaxError", function(){new WebSocket("ws://certo2.oslo.osa/protocol_array",["foobar, foobar"])})});
+</script>
diff --git a/test/wpt/tests/websockets/constructor/022.html b/test/wpt/tests/websockets/constructor/022.html
new file mode 100644
index 00000000000..a55d8f349d7
--- /dev/null
+++ b/test/wpt/tests/websockets/constructor/022.html
@@ -0,0 +1,23 @@
+<!doctype html>
+<title>WebSockets: protocol array</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=../constants.sub.js></script>
+<meta name="variant" content="">
+<meta name="variant" content="?wss">
+<meta name="variant" content="?wpt_flags=h2">
+<div id=log></div>
+<script>
+async_test(function(t) {
+  var ws = new WebSocket(SCHEME_DOMAIN_PORT+'/protocol_array',['foobar','foobar2']);
+  ws.onmessage = t.step_func(function(e) {
+    assert_equals(ws.protocol, 'foobar');
+    ws.onclose = t.step_func(function(e) {
+      ws.onclose = t.unreached_func();
+      t.step_timeout(() => t.done(), 50);
+    });
+    ws.close();
+  });
+  ws.onerror = t.unreached_func();
+});
+</script>
diff --git a/test/wpt/tests/websockets/cookies/001.html b/test/wpt/tests/websockets/cookies/001.html
new file mode 100644
index 00000000000..c43947fa877
--- /dev/null
+++ b/test/wpt/tests/websockets/cookies/001.html
@@ -0,0 +1,28 @@
+<!doctype html>
+<title>WebSockets: Cookie in request</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=../constants.sub.js></script>
+<meta name="variant" content="">
+<meta name="variant" content="?wss&wpt_flags=https">
+<meta name="variant" content="?wpt_flags=h2">
+<div id=log></div>
+<script>
+var cookie_id = ((new Date())-0) + '.' + Math.random();
+async_test(function(t) {
+  if (window.WebSocket) {
+    document.cookie = 'ws_test_'+cookie_id+'=test; Path=/';
+  }
+  t.add_cleanup(function() {
+    // remove cookie
+    document.cookie = 'ws_test_'+cookie_id+'=; Path=/; Expires=Sun, 06 Nov 1994 08:49:37 GMT';
+  });
+  var ws = new WebSocket(SCHEME_DOMAIN_PORT+'/echo-cookie');
+  ws.onmessage = t.step_func(function(e) {
+    assert_regexp_match(e.data, new RegExp('ws_test_'+cookie_id+'=test'));
+    ws.close();
+    t.done();
+  });
+  ws.onerror = ws.onclose = t.step_func(function(e) {assert_unreached(e.type)});
+});
+</script>
diff --git a/test/wpt/tests/websockets/cookies/002.html b/test/wpt/tests/websockets/cookies/002.html
new file mode 100644
index 00000000000..1a5e03e3351
--- /dev/null
+++ b/test/wpt/tests/websockets/cookies/002.html
@@ -0,0 +1,26 @@
+<!doctype html>
+<title>WebSockets: Set-Cookie in response</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=../constants.sub.js></script>
+<meta name="variant" content="">
+<meta name="variant" content="?wss&wpt_flags=https">
+<meta name="variant" content="?wpt_flags=h2">
+<div id=log></div>
+<script>
+var cookie_id = ((new Date())-0) + '.' + Math.random();
+async_test(function(t) {
+  t.add_cleanup(function() {
+    // remove cookie
+    document.cookie = 'ws_test_'+cookie_id+'=; Path=/; Expires=Sun, 06 Nov 1994 08:49:37 GMT';
+  });
+  var ws = new WebSocket(SCHEME_DOMAIN_PORT+'/set-cookie?'+cookie_id);
+  ws.onopen = t.step_func(function(e) {
+    assert_regexp_match(document.cookie, new RegExp('ws_test_'+cookie_id+'=test'));
+    ws.close();
+    ws.onclose = null;
+    t.done();
+  });
+  ws.onerror = ws.onclose = t.step_func(function(e) {assert_unreached(e.type)});
+});
+</script>
diff --git a/test/wpt/tests/websockets/cookies/003.html b/test/wpt/tests/websockets/cookies/003.html
new file mode 100644
index 00000000000..2af47354028
--- /dev/null
+++ b/test/wpt/tests/websockets/cookies/003.html
@@ -0,0 +1,34 @@
+<!doctype html>
+<title>WebSockets: sending HttpOnly cookies in ws request</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=../constants.sub.js></script>
+<meta name="variant" content="">
+<meta name="variant" content="?wss&wpt_flags=https">
+<meta name="variant" content="?wpt_flags=h2">
+<div id=log></div>
+<script>
+setup({explicit_done:true})
+var cookie_id = ((new Date())-0) + '.' + Math.random();
+
+var t = async_test(function(t) {
+  var iframe = document.createElement('iframe');
+  t.add_cleanup(function() {
+    // remove cookie
+    iframe.src = 'support/set-cookie.py?'+encodeURIComponent('ws_test_'+cookie_id+'=; Path=/; HttpOnly; Expires=Sun, 06 Nov 1994 08:49:37 GMT');
+    iframe.onload = done;
+  });
+  iframe.src = 'support/set-cookie.py?'+encodeURIComponent('ws_test_'+cookie_id+'=test; Path=/; HttpOnly');
+  iframe.onload = t.step_func(function() {
+    var ws = new WebSocket(SCHEME_DOMAIN_PORT+'/echo-cookie');
+    ws.onmessage = t.step_func(function(e) {
+      ws.close();
+      ws.onclose = null;
+      assert_regexp_match(e.data, new RegExp('ws_test_'+cookie_id+'=test'));
+      t.done();
+    });
+    ws.onerror = ws.onclose = t.step_func(function(e) {assert_unreached(e.type)});
+  });
+  document.body.appendChild(iframe);
+});
+</script>
diff --git a/test/wpt/tests/websockets/cookies/004.html b/test/wpt/tests/websockets/cookies/004.html
new file mode 100644
index 00000000000..efc3a9f84d4
--- /dev/null
+++ b/test/wpt/tests/websockets/cookies/004.html
@@ -0,0 +1,31 @@
+<!doctype html>
+<title>WebSockets: setting HttpOnly cookies in ws response, checking document.cookie</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=../constants.sub.js></script>
+<meta name="variant" content="">
+<meta name="variant" content="?wss&wpt_flags=https">
+<div id=log></div>
+<script>
+setup({explicit_done:true})
+var cookie_id = ((new Date())-0) + '.' + Math.random();
+
+var t = async_test(function(t) {
+  var iframe = document.createElement('iframe');
+  t.add_cleanup(function() {
+    // remove cookie
+    iframe.src = 'support/set-cookie.py?'+encodeURIComponent('ws_test_'+cookie_id+'=; Path=/; HttpOnly; Expires=Sun, 06 Nov 1994 08:49:37 GMT');
+    iframe.onload = done;
+  });
+  var url = SCHEME_DOMAIN_PORT+'/set-cookie_http?'+cookie_id;
+  var ws = new WebSocket(url);
+  ws.onopen = t.step_func(function(e) {
+    ws.close();
+    ws.onclose = null;
+    assert_false(new RegExp('ws_test_'+cookie_id+'=test').test(document.cookie));
+    t.done();
+  });
+  ws.onerror = ws.onclose = t.step_func(function(e) {assert_unreached(e.type)});
+  document.body.appendChild(iframe);
+});
+</script>
diff --git a/test/wpt/tests/websockets/cookies/005.html b/test/wpt/tests/websockets/cookies/005.html
new file mode 100644
index 00000000000..8940d95127f
--- /dev/null
+++ b/test/wpt/tests/websockets/cookies/005.html
@@ -0,0 +1,35 @@
+<!doctype html>
+<title>WebSockets: setting HttpOnly cookies in ws response, checking ws request</title>
+<meta name=timeout content=long>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=../constants.sub.js></script>
+<meta name="variant" content="">
+<meta name="variant" content="?wss&wpt_flags=https">
+<div id=log></div>
+<script>
+setup({explicit_done:true})
+var cookie_id = ((new Date())-0) + '.' + Math.random();
+
+var t = async_test(function(t) {
+  var iframe = document.createElement('iframe');
+  t.add_cleanup(function() {
+    // remove cookie
+    iframe.src = 'support/set-cookie.py?'+encodeURIComponent('ws_test_'+cookie_id+'=; Path=/; HttpOnly; Expires=Sun, 06 Nov 1994 08:49:37 GMT');
+    iframe.onload = done;
+  });
+  var ws = new WebSocket(SCHEME_DOMAIN_PORT+'/set-cookie_http?'+cookie_id);
+  ws.onopen = t.step_func(function(e) {
+    var ws2 = new WebSocket(SCHEME_DOMAIN_PORT+'/echo-cookie');
+    ws2.onmessage = t.step_func(function(e) {
+      ws.close();
+      ws.onclose = null;
+      ws2.close();
+      assert_regexp_match(e.data, new RegExp('ws_test_'+cookie_id+'=test'));
+      t.done();
+    });
+  });
+  ws.onerror = ws.onclose = t.step_func(function(e) {assert_unreached(e.type)});
+  document.body.appendChild(iframe);
+})
+</script>
diff --git a/test/wpt/tests/websockets/cookies/006.html b/test/wpt/tests/websockets/cookies/006.html
new file mode 100644
index 00000000000..3c74363a432
--- /dev/null
+++ b/test/wpt/tests/websockets/cookies/006.html
@@ -0,0 +1,35 @@
+<!doctype html>
+<title>WebSockets: setting Secure cookie with document.cookie, checking ws request</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=../constants.sub.js></script>
+<meta name="variant" content="">
+<meta name="variant" content="?wss&wpt_flags=https">
+<meta name="variant" content="?wpt_flags=h2">
+<div id=log></div>
+<script>
+var cookie_id = ((new Date())-0) + '.' + Math.random();
+async_test(function(t) {
+  if (window.WebSocket) {
+    document.cookie = 'ws_test_'+cookie_id+'=test; Path=/; Secure';
+  }
+  t.add_cleanup(function() {
+    // remove cookie
+    document.cookie = 'ws_test_'+cookie_id+'=; Path=/; Secure; Expires=Sun, 06 Nov 1994 08:49:37 GMT';
+  });
+  var ws = new WebSocket(SCHEME_DOMAIN_PORT+'/echo-cookie');
+  ws.onmessage = t.step_func(function(e) {
+    ws.close();
+    var cookie_was_seen = e.data.indexOf('ws_test_'+cookie_id+'=test') != -1;
+    if (SCHEME_DOMAIN_PORT.substr(0,3) == 'wss') {
+      assert_true(cookie_was_seen,
+                  'cookie should have been visible to wss');
+    } else {
+      assert_false(cookie_was_seen,
+                   'cookie should not have been visible to ws');
+    }
+    t.done();
+  })
+  ws.onerror = ws.onclose = t.step_func(function(e) {assert_unreached(e.type)});
+});
+</script>
diff --git a/test/wpt/tests/websockets/cookies/007.html b/test/wpt/tests/websockets/cookies/007.html
new file mode 100644
index 00000000000..2c214a1dbb0
--- /dev/null
+++ b/test/wpt/tests/websockets/cookies/007.html
@@ -0,0 +1,36 @@
+<!doctype html>
+<title>WebSockets: when to process set-cookie fields in ws response</title>
+<meta name=timeout content=long>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=../constants.sub.js></script>
+<meta name="variant" content="">
+<meta name="variant" content="?wss&wpt_flags=https">
+<meta name="variant" content="?wpt_flags=h2">
+<div id=log></div>
+<script>
+var cookie_id = ((new Date())-0) + '.' + Math.random();
+async_test(function(t) {
+  t.add_cleanup(function() {
+    // remove cookie
+    document.cookie = 'ws_test_'+cookie_id+'; Path=/; Expires=Sun, 06 Nov 1994 08:49:37 GMT';
+  });
+  var ws = new WebSocket(SCHEME_DOMAIN_PORT+'/set-cookie?'+cookie_id);
+  ws.onopen = t.step_func(function(e) {
+    ws.close();
+    ws.onclose = null;
+    assert_regexp_match(document.cookie, new RegExp('ws_test_'+cookie_id+'=test'));
+    t.done();
+  });
+  ws.onerror = ws.onclose = t.step_func(function() {assert_unreached()});
+
+  // sleep for 2 seconds with sync xhr
+  var sleep = new XMLHttpRequest();
+  sleep.open('GET', '/common/blank.html?pipe=trickle(d2)', false);
+  sleep.send(null);
+
+  if (new RegExp('ws_test_'+cookie_id+'=test').test(document.cookie)) {
+    assert_unreached('cookie was set during script execution');
+  }
+});
+</script>
diff --git a/test/wpt/tests/websockets/cookies/support/set-cookie.py b/test/wpt/tests/websockets/cookies/support/set-cookie.py
new file mode 100644
index 00000000000..71cd8bca607
--- /dev/null
+++ b/test/wpt/tests/websockets/cookies/support/set-cookie.py
@@ -0,0 +1,7 @@
+from urllib.parse import unquote
+
+from wptserve.utils import isomorphic_encode
+
+def main(request, response):
+    response.headers.set(b'Set-Cookie', isomorphic_encode(unquote(request.url_parts.query)))
+    return [(b"Content-Type", b"text/plain")], b""
diff --git a/test/wpt/tests/websockets/cookies/support/websocket-cookies-helper.sub.js b/test/wpt/tests/websockets/cookies/support/websocket-cookies-helper.sub.js
new file mode 100644
index 00000000000..a7fae2551e4
--- /dev/null
+++ b/test/wpt/tests/websockets/cookies/support/websocket-cookies-helper.sub.js
@@ -0,0 +1,57 @@
+// Set up global variables.
+(_ => {
+  var HOST = '{{host}}';
+  var CROSS_ORIGIN_HOST = '{{hosts[alt][]}}';
+  var WSS_PORT = ':{{ports[wss][0]}}';
+  var HTTPS_PORT = ':{{ports[https][0]}}';
+
+  window.WSS_ORIGIN = 'wss://' + HOST + WSS_PORT;
+  window.WSS_CROSS_SITE_ORIGIN = 'wss://' + CROSS_ORIGIN_HOST + WSS_PORT;
+  window.HTTPS_ORIGIN = 'https://' + HOST + HTTPS_PORT;
+  window.HTTPS_CROSS_SITE_ORIGIN = 'https://' + CROSS_ORIGIN_HOST + HTTPS_PORT;
+})();
+
+// Sets a cookie with each SameSite option.
+function setSameSiteCookies(origin, value) {
+  return new Promise(resolve => {
+    const ws = new WebSocket(origin + '/set-cookies-samesite?value=' + value);
+    ws.onopen = () => {
+      ws.close();
+    };
+    ws.onclose = resolve;
+  });
+}
+
+// Clears cookies set by setSameSiteCookies().
+function clearSameSiteCookies(origin) {
+  return new Promise(resolve => {
+    const ws = new WebSocket(origin + '/set-cookies-samesite?clear');
+    ws.onopen = () => ws.close();
+    ws.onclose = resolve;
+  });
+}
+
+// Gets value of Cookie header sent in request.
+function connectAndGetRequestCookiesFrom(origin) {
+  return new Promise((resolve, reject) => {
+      var ws = new WebSocket(origin + '/echo-cookie');
+      ws.onmessage = evt => {
+          var cookies = evt.data
+          resolve(cookies);
+          ws.onerror = undefined;
+          ws.onclose = undefined;
+      };
+      ws.onerror = () => reject('Unexpected error event');
+      ws.onclose = evt => reject('Unexpected close event: ' + JSON.stringify(evt));
+  });
+}
+
+// Assert that a given cookie is or is not present in the string |cookies|.
+function assertCookie(cookies, name, value, present) {
+  var assertion = present ? assert_true : assert_false;
+  var description = name + '=' + value + ' cookie is' +
+                    (present ? ' ' : ' not ') + 'present.';
+  var re = new RegExp('(?:^|; )' + name + '=' + value + '(?:$|;)');
+  assertion(re.test(cookies), description);
+}
+
diff --git a/test/wpt/tests/websockets/cookies/third-party-cookie-accepted.https.html b/test/wpt/tests/websockets/cookies/third-party-cookie-accepted.https.html
new file mode 100644
index 00000000000..208d297016f
--- /dev/null
+++ b/test/wpt/tests/websockets/cookies/third-party-cookie-accepted.https.html
@@ -0,0 +1,25 @@
+<!DOCTYPE html>
+<meta charset="utf-8"/>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="support/websocket-cookies-helper.sub.js"></script>
+<script>
+promise_test(() => {
+  var value = '' + Math.random();
+  var origin = WSS_CROSS_SITE_ORIGIN;
+  return setSameSiteCookies(origin, value).then(
+    () => { return connectAndGetRequestCookiesFrom(origin); }
+  ).then(
+    cookies => {
+      assert_not_equals(cookies, '(none)', 'request should contain cookies.');
+      // SameSite cookies are blocked.
+      assertCookie(cookies, 'samesite-unspecified', value, false /* present */);
+      assertCookie(cookies, 'samesite-lax', value, false /* present */);
+      assertCookie(cookies, 'samesite-strict', value, false /* present */);
+      // SameSite=None third-party cookie is not blocked.
+      assertCookie(cookies, 'samesite-none', value, true /* present */);
+      return clearSameSiteCookies(origin);
+    }
+  );
+}, 'Test that third-party cookies are accepted for WebSockets.');
+</script>
diff --git a/test/wpt/tests/websockets/extended-payload-length.html b/test/wpt/tests/websockets/extended-payload-length.html
new file mode 100644
index 00000000000..23caedc461c
--- /dev/null
+++ b/test/wpt/tests/websockets/extended-payload-length.html
@@ -0,0 +1,72 @@
+<!doctype html>
+<title>WebSockets : Boundary-value tests for the 'Extended payload length' field in RFC6455 section5.2 'Base Framing Protocol'</title>
+<meta name=timeout content=long>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=constants.sub.js></script>
+<meta name="variant" content="">
+<meta name="variant" content="?wss">
+<meta name="variant" content="?wpt_flags=h2">
+<div id=log></div>
+<script>
+async_test(function(t){
+    var ws = new WebSocket(SCHEME_DOMAIN_PORT+'/echo');
+    var datasize = 125;
+    var data = null;
+    ws.onopen = t.step_func(function(e) {
+        data = new Array(datasize + 1).join('a');
+        ws.send(data);
+    });
+    ws.onmessage = t.step_func(function(e) {
+        assert_equals(e.data, data);
+        t.done();
+    });
+    ws.onclose = t.unreached_func('close event should not fire');
+}, "Application data is 125 byte which means any 'Extended payload length' field isn't used at all.");
+
+async_test(function(t){
+    var ws = new WebSocket(SCHEME_DOMAIN_PORT+'/echo');
+    var datasize = 126;
+    var data = null;
+    ws.onopen = t.step_func(function(e) {
+        data = new Array(datasize + 1).join('a');
+        ws.send(data);
+    });
+    ws.onmessage = t.step_func(function(e) {
+        assert_equals(e.data, data);
+        t.done();
+    });
+    ws.onclose = t.unreached_func('close event should not fire');
+}, "Application data is 126 byte which starts to use the 16 bit 'Extended payload length' field.");
+
+async_test(function(t){
+    var ws = new WebSocket(SCHEME_DOMAIN_PORT+'/echo');
+    var datasize = 0xFFFF;
+    var data = null;
+    ws.onopen = t.step_func(function(e) {
+        data = new Array(datasize + 1).join('a');
+        ws.send(data);
+    });
+    ws.onmessage = t.step_func(function(e) {
+        assert_equals(e.data, data);
+        t.done();
+    });
+    ws.onclose = t.unreached_func('close event should not fire');
+}, "Application data is 0xFFFF byte which means the upper bound of the 16 bit 'Extended payload length' field.");
+
+async_test(function(t){
+    var ws = new WebSocket(SCHEME_DOMAIN_PORT+'/echo');
+    var datasize = 0xFFFF + 1;
+    var data = null;
+    ws.onopen = t.step_func(function(e) {
+        data = new Array(datasize + 1).join('a');
+        ws.send(data);
+    });
+    ws.onmessage = t.step_func(function(e) {
+        assert_equals(e.data, data);
+        t.done();
+    });
+    ws.onclose = t.unreached_func('close event should not fire');
+}, "Application data is (0xFFFF + 1) byte which starts to use the 64 bit 'Extended payload length' field");
+
+</script>
diff --git a/test/wpt/tests/websockets/handlers/basic_auth_wsh.py b/test/wpt/tests/websockets/handlers/basic_auth_wsh.py
new file mode 100644
index 00000000000..72e920a1d82
--- /dev/null
+++ b/test/wpt/tests/websockets/handlers/basic_auth_wsh.py
@@ -0,0 +1,26 @@
+#!/usr/bin/python
+
+"""A WebSocket handler that enforces basic HTTP authentication. Username is
+'foo' and password is 'bar'."""
+
+
+from mod_pywebsocket.handshake import AbortedByUserException
+
+
+def web_socket_do_extra_handshake(request):
+    authorization = request.headers_in.get('authorization')
+    if authorization is None or authorization != 'Basic Zm9vOmJhcg==':
+        if request.protocol == "HTTP/2":
+            request.status = 401
+            request.headers_out["Content-Length"] = "0"
+            request.headers_out['www-authenticate'] = 'Basic realm="camelot"'
+        else:
+            request.connection.write(b'HTTP/1.1 401 Unauthorized\x0d\x0a'
+                                     b'Content-Length: 0\x0d\x0a'
+                                     b'WWW-Authenticate: Basic realm="camelot"\x0d\x0a'
+                                     b'\x0d\x0a')
+        raise AbortedByUserException('Abort the connection')
+
+
+def web_socket_transfer_data(request):
+    pass
diff --git a/test/wpt/tests/websockets/handlers/delayed-passive-close_wsh.py b/test/wpt/tests/websockets/handlers/delayed-passive-close_wsh.py
new file mode 100644
index 00000000000..7d55b88ecc6
--- /dev/null
+++ b/test/wpt/tests/websockets/handlers/delayed-passive-close_wsh.py
@@ -0,0 +1,27 @@
+#!/usr/bin/python
+from mod_pywebsocket import common
+import time
+
+def web_socket_do_extra_handshake(request):
+    pass
+
+
+def web_socket_transfer_data(request):
+    # Wait for the close frame to arrive.
+    request.ws_stream.receive_message()
+
+
+def web_socket_passive_closing_handshake(request):
+    # Echo close status code and reason
+    code, reason = request.ws_close_code, request.ws_close_reason
+
+    # No status received is a reserved pseudo code representing an empty code,
+    # so echo back an empty code in this case.
+    if code == common.STATUS_NO_STATUS_RECEIVED:
+        code = None
+
+    # The browser may error the connection if the closing handshake takes too
+    # long, but hopefully no browser will have a timeout this short.
+    time.sleep(1)
+
+    return code, reason
diff --git a/test/wpt/tests/websockets/handlers/echo-cookie_wsh.py b/test/wpt/tests/websockets/handlers/echo-cookie_wsh.py
new file mode 100644
index 00000000000..98620b65524
--- /dev/null
+++ b/test/wpt/tests/websockets/handlers/echo-cookie_wsh.py
@@ -0,0 +1,12 @@
+#!/usr/bin/python
+
+from mod_pywebsocket import msgutil
+
+def web_socket_do_extra_handshake(request):
+    request.ws_cookie = request.headers_in.get('cookie')
+
+def web_socket_transfer_data(request):
+    if request.ws_cookie is not None:
+        msgutil.send_message(request, request.ws_cookie)
+    else:
+        msgutil.send_message(request, '(none)')
diff --git a/test/wpt/tests/websockets/handlers/echo-query_v13_wsh.py b/test/wpt/tests/websockets/handlers/echo-query_v13_wsh.py
new file mode 100644
index 00000000000..d670e6e6605
--- /dev/null
+++ b/test/wpt/tests/websockets/handlers/echo-query_v13_wsh.py
@@ -0,0 +1,11 @@
+#!/usr/bin/python
+
+from mod_pywebsocket import msgutil
+
+def web_socket_do_extra_handshake(request):
+    pass
+
+def web_socket_transfer_data(request):
+    while True:
+        msgutil.send_message(request, request.unparsed_uri.split('?')[1] or '')
+        return
diff --git a/test/wpt/tests/websockets/handlers/echo-query_wsh.py b/test/wpt/tests/websockets/handlers/echo-query_wsh.py
new file mode 100644
index 00000000000..39219134952
--- /dev/null
+++ b/test/wpt/tests/websockets/handlers/echo-query_wsh.py
@@ -0,0 +1,9 @@
+#!/usr/bin/python
+
+from mod_pywebsocket import msgutil
+
+def web_socket_do_extra_handshake(request):
+    pass  # Always accept.
+
+def web_socket_transfer_data(request):
+    msgutil.send_message(request, request.unparsed_uri.split('?', 1)[1] or '')
diff --git a/test/wpt/tests/websockets/handlers/echo_close_data_wsh.py b/test/wpt/tests/websockets/handlers/echo_close_data_wsh.py
new file mode 100644
index 00000000000..31ffcbb8495
--- /dev/null
+++ b/test/wpt/tests/websockets/handlers/echo_close_data_wsh.py
@@ -0,0 +1,20 @@
+#!/usr/bin/python
+
+_GOODBYE_MESSAGE = u'Goodbye'
+
+def web_socket_do_extra_handshake(request):
+    # This example handler accepts any request. See origin_check_wsh.py for how
+    # to reject access from untrusted scripts based on origin value.
+
+    pass  # Always accept.
+
+
+def web_socket_transfer_data(request):
+    while True:
+        line = request.ws_stream.receive_message()
+        if line is None:
+            return
+        if isinstance(line, str):
+            if line == _GOODBYE_MESSAGE:
+                return
+                request.ws_stream.send_message(line, binary=False)
diff --git a/test/wpt/tests/websockets/handlers/echo_exit_wsh.py b/test/wpt/tests/websockets/handlers/echo_exit_wsh.py
new file mode 100644
index 00000000000..8f6f7f854e0
--- /dev/null
+++ b/test/wpt/tests/websockets/handlers/echo_exit_wsh.py
@@ -0,0 +1,19 @@
+#!/usr/bin/python
+
+_GOODBYE_MESSAGE = u'Goodbye'
+
+def web_socket_do_extra_handshake(request):
+    # This example handler accepts any request. See origin_check_wsh.py for how
+    # to reject access from untrusted scripts based on origin value.
+
+    pass  # Always accept.
+
+
+def web_socket_transfer_data(request):
+    while True:
+        line = request.ws_stream.receive_message()
+        if line is None:
+            return
+        if isinstance(line, str):
+            if line == _GOODBYE_MESSAGE:
+                return
diff --git a/test/wpt/tests/websockets/handlers/echo_raw_wsh.py b/test/wpt/tests/websockets/handlers/echo_raw_wsh.py
new file mode 100644
index 00000000000..e1fc26608ff
--- /dev/null
+++ b/test/wpt/tests/websockets/handlers/echo_raw_wsh.py
@@ -0,0 +1,16 @@
+#!/usr/bin/python
+
+from mod_pywebsocket import msgutil
+
+
+def web_socket_do_extra_handshake(request):
+    pass  # Always accept.
+
+def web_socket_transfer_data(request):
+    while True:
+        line = msgutil.receive_message(request)
+        if line == b'exit':
+            return
+
+        if line is not None:
+            request.connection.write(line)
diff --git a/test/wpt/tests/websockets/handlers/echo_wsh.py b/test/wpt/tests/websockets/handlers/echo_wsh.py
new file mode 100644
index 00000000000..7367b70af16
--- /dev/null
+++ b/test/wpt/tests/websockets/handlers/echo_wsh.py
@@ -0,0 +1,36 @@
+#!/usr/bin/python
+
+from mod_pywebsocket import common
+
+_GOODBYE_MESSAGE = u'Goodbye'
+
+def web_socket_do_extra_handshake(request):
+    # This example handler accepts any request. See origin_check_wsh.py for how
+    # to reject access from untrusted scripts based on origin value.
+    if request.ws_requested_protocols:
+        if "echo" in request.ws_requested_protocols:
+            request.ws_protocol = "echo"
+
+
+def web_socket_transfer_data(request):
+    while True:
+        line = request.ws_stream.receive_message()
+        if line is None:
+            return
+        if isinstance(line, str):
+            request.ws_stream.send_message(line, binary=False)
+            if line == _GOODBYE_MESSAGE:
+                return
+        else:
+            request.ws_stream.send_message(line, binary=True)
+
+def web_socket_passive_closing_handshake(request):
+    # Echo close status code and reason
+    code, reason = request.ws_close_code, request.ws_close_reason
+
+    # No status received is a reserved pseudo code representing an empty code,
+    # so echo back an empty code in this case.
+    if code == common.STATUS_NO_STATUS_RECEIVED:
+        code = None
+
+    return code, reason
diff --git a/test/wpt/tests/websockets/handlers/empty-message_wsh.py b/test/wpt/tests/websockets/handlers/empty-message_wsh.py
new file mode 100644
index 00000000000..0eb107f0b12
--- /dev/null
+++ b/test/wpt/tests/websockets/handlers/empty-message_wsh.py
@@ -0,0 +1,13 @@
+#!/usr/bin/python
+
+from mod_pywebsocket import msgutil
+
+def web_socket_do_extra_handshake(request):
+    pass  # Always accept.
+
+def web_socket_transfer_data(request):
+    line = msgutil.receive_message(request)
+    if line == "":
+        msgutil.send_message(request, 'pass')
+    else:
+        msgutil.send_message(request, 'fail')
diff --git a/test/wpt/tests/websockets/handlers/handshake_no_extensions_wsh.py b/test/wpt/tests/websockets/handlers/handshake_no_extensions_wsh.py
new file mode 100644
index 00000000000..0d0f0a8b73a
--- /dev/null
+++ b/test/wpt/tests/websockets/handlers/handshake_no_extensions_wsh.py
@@ -0,0 +1,9 @@
+#!/usr/bin/python
+
+
+def web_socket_do_extra_handshake(request):
+    request.ws_extension_processors = []
+
+
+def web_socket_transfer_data(request):
+    pass
diff --git a/test/wpt/tests/websockets/handlers/handshake_no_protocol_wsh.py b/test/wpt/tests/websockets/handlers/handshake_no_protocol_wsh.py
new file mode 100644
index 00000000000..ffc2ae80eff
--- /dev/null
+++ b/test/wpt/tests/websockets/handlers/handshake_no_protocol_wsh.py
@@ -0,0 +1,8 @@
+#!/usr/bin/python
+
+def web_socket_do_extra_handshake(request):
+    # Trick pywebsocket into believing no subprotocol was requested.
+    request.ws_requested_protocols = None
+
+def web_socket_transfer_data(request):
+    pass
diff --git a/test/wpt/tests/websockets/handlers/handshake_protocol_wsh.py b/test/wpt/tests/websockets/handlers/handshake_protocol_wsh.py
new file mode 100644
index 00000000000..2ca20c052db
--- /dev/null
+++ b/test/wpt/tests/websockets/handlers/handshake_protocol_wsh.py
@@ -0,0 +1,7 @@
+#!/usr/bin/python
+
+def web_socket_do_extra_handshake(request):
+    request.ws_protocol = 'foobar'
+
+def web_socket_transfer_data(request):
+    pass
\ No newline at end of file
diff --git a/test/wpt/tests/websockets/handlers/handshake_sleep_2_wsh.py b/test/wpt/tests/websockets/handlers/handshake_sleep_2_wsh.py
new file mode 100644
index 00000000000..78de7c7659a
--- /dev/null
+++ b/test/wpt/tests/websockets/handlers/handshake_sleep_2_wsh.py
@@ -0,0 +1,9 @@
+#!/usr/bin/python
+
+import time
+
+def web_socket_do_extra_handshake(request):
+    time.sleep(2)
+
+def web_socket_transfer_data(request):
+    pass
diff --git a/test/wpt/tests/websockets/handlers/invalid_wsh.py b/test/wpt/tests/websockets/handlers/invalid_wsh.py
new file mode 100644
index 00000000000..4bfc3ce4e77
--- /dev/null
+++ b/test/wpt/tests/websockets/handlers/invalid_wsh.py
@@ -0,0 +1,8 @@
+#!/usr/bin/python
+
+def web_socket_do_extra_handshake(request):
+    request.connection.write(b"FOO BAR BAZ\r\n\r\n")
+
+
+def web_socket_transfer_data(request):
+    pass
diff --git a/test/wpt/tests/websockets/handlers/msg_channel_wsh.py b/test/wpt/tests/websockets/handlers/msg_channel_wsh.py
new file mode 100644
index 00000000000..7a66646f2bc
--- /dev/null
+++ b/test/wpt/tests/websockets/handlers/msg_channel_wsh.py
@@ -0,0 +1,234 @@
+#!/usr/bin/python
+import json
+import logging
+import urllib
+import threading
+import traceback
+from queue import Empty
+
+from mod_pywebsocket import stream, msgutil
+from wptserve import stash as stashmod
+
+logger = logging.getLogger()
+
+address, authkey = stashmod.load_env_config()
+stash = stashmod.Stash("msg_channel", address=address, authkey=authkey)
+
+# Backend for websocket based channels.
+#
+# Each socket connection has a uuid identifying the channel and a
+# direction which is either "read" or "write".  There can be only 1
+# "read" channel per uuid, but multiple "write" channels
+# (i.e. multiple producer, single consumer).
+#
+# The websocket connection URL contains the uuid and the direction as
+# named query parameters.
+#
+# Channels are backed by a queue which is stored in the stash (one
+# queue per uuid).
+#
+# The representation of a queue in the stash is a tuple (queue,
+# has_reader, writer_count).  The first field is the queue itself, the
+# latter are effectively reference counts for reader channels (which
+# is zero or one, represented by a bool) and writer channels.  Once
+# both counts drop to zero the queue can be deleted.
+#
+# Entries on the queue itself are formed of (command, data) pairs. The
+# command can be either "close", signalling the socket is closing and
+# the reference count on the channel should be decremented, or
+# "message", which indicates a message.
+
+
+def log(uuid, msg, level="debug"):
+    msg = f"{uuid}: {msg}"
+    getattr(logger, level)(msg)
+
+
+def web_socket_do_extra_handshake(request):
+    return
+
+
+def web_socket_transfer_data(request):
+    """Handle opening a websocket connection."""
+
+    uuid, direction = parse_request(request)
+    log(uuid, f"Got web_socket_transfer_data {direction}")
+
+    # Get or create the relevant queue from the stash and update the refcount
+    with stash.lock:
+        value = stash.take(uuid)
+        if value is None:
+            queue = stash.get_queue()
+            if direction == "read":
+                has_reader = True
+                writer_count = 0
+            else:
+                has_reader = False
+                writer_count = 1
+        else:
+            queue, has_reader, writer_count = value
+            if direction == "read":
+                if has_reader:
+                    raise ValueError("Tried to start multiple readers for the same queue")
+                has_reader = True
+            else:
+                writer_count += 1
+
+        stash.put(uuid, (queue, has_reader, writer_count))
+
+    if direction == "read":
+        run_read(request, uuid, queue)
+    elif direction == "write":
+        run_write(request, uuid, queue)
+
+    log(uuid, f"transfer_data loop exited {direction}")
+    close_channel(uuid, direction)
+
+
+def web_socket_passive_closing_handshake(request):
+    """Handle a client initiated close.
+
+    When the client closes a reader, put a message in the message
+    queue indicating the close. For a writer we don't need special
+    handling here because receive_message in run_read will return an
+    empty message in this case, so that loop will exit on its own.
+    """
+    uuid, direction = parse_request(request)
+    log(uuid, f"Got web_socket_passive_closing_handshake {direction}")
+
+    if direction == "read":
+        with stash.lock:
+            data = stash.take(uuid)
+            stash.put(uuid, data)
+        if data is not None:
+            queue = data[0]
+            queue.put(("close", None))
+
+    return request.ws_close_code, request.ws_close_reason
+
+
+def parse_request(request):
+    query = request.unparsed_uri.split('?')[1]
+    GET = dict(urllib.parse.parse_qsl(query))
+    uuid = GET["uuid"]
+    direction = GET["direction"]
+    return uuid, direction
+
+
+def wait_for_close(request, uuid, queue):
+    """Listen for messages on the socket for a read connection to a channel."""
+    closed = False
+    while not closed:
+        try:
+            msg = request.ws_stream.receive_message()
+            if msg is None:
+                break
+            try:
+                cmd, data = json.loads(msg)
+            except ValueError:
+                cmd = None
+            if cmd == "close":
+                closed = True
+                log(uuid, "Got client initiated close")
+            else:
+                log(uuid, f"Unexpected message on read socket {msg}", "warning")
+        except Exception:
+            if not (request.server_terminated or request.client_terminated):
+                log(uuid, f"Got exception in wait_for_close\n{traceback.format_exc()}")
+            closed = True
+
+    if not request.server_terminated:
+        queue.put(("close", None))
+
+
+def run_read(request, uuid, queue):
+    """Main loop for a read-type connection.
+
+    This mostly just listens on the queue for new messages of the
+    form (message, data). Supported messages are:
+     message - Send `data` on the WebSocket
+     close - Close the reader queue
+
+    In addition there's a thread that listens for messages on the
+    socket itself. Typically this socket shouldn't recieve any
+    messages, but it can recieve an explicit "close" message,
+    indicating the socket should be disconnected.
+    """
+
+    close_thread = threading.Thread(target=wait_for_close, args=(request, uuid, queue), daemon=True)
+    close_thread.start()
+
+    while True:
+        try:
+            data = queue.get(True, 1)
+        except Empty:
+            if request.server_terminated or request.client_terminated:
+                break
+        else:
+            cmd, body = data
+            log(uuid, f"queue.get ({cmd}, {body})")
+            if cmd == "close":
+                break
+            if cmd == "message":
+                msgutil.send_message(request, json.dumps(body))
+            else:
+                log(uuid, f"Unknown queue command {cmd}", level="warning")
+
+
+def run_write(request, uuid, queue):
+    """Main loop for a write-type connection.
+
+    Messages coming over the socket have the format (command, data).
+    The recognised commands are:
+     message - Send the message `data` over the channel.
+     disconnectReader - Close the reader connection for this channel.
+     delete - Force-delete the entire channel and the underlying queue.
+    """
+    while True:
+        msg = request.ws_stream.receive_message()
+        if msg is None:
+            break
+        cmd, body = json.loads(msg)
+        if cmd == "disconnectReader":
+            queue.put(("close", None))
+        elif cmd == "message":
+            log(uuid, f"queue.put ({cmd}, {body})")
+            queue.put((cmd, body))
+        elif cmd == "delete":
+            close_channel(uuid, None)
+
+
+def close_channel(uuid, direction):
+    """Update the channel state in the stash when closing a connection
+
+    This updates the stash entry, including refcounts, once a
+    connection to a channel is closed.
+
+    Params:
+    uuid - the UUID of the channel being closed.
+    direction - "read" if a read connection was closed, "write" if a
+                write connection was closed, None to remove the
+                underlying queue from the stash entirely.
+
+    """
+    log(uuid, f"Got close_channel {direction}")
+    with stash.lock:
+        data = stash.take(uuid)
+        if data is None:
+            log(uuid, "Message queue already deleted")
+            return
+        if direction is None:
+            # Return without replacing the channel in the stash
+            log(uuid, "Force deleting message queue")
+            return
+        queue, has_reader, writer_count = data
+        if direction == "read":
+            has_reader = False
+        else:
+            writer_count -= 1
+
+        if has_reader or writer_count > 0 or not queue.empty():
+            log(uuid, f"Updating refcount {has_reader}, {writer_count}")
+            stash.put(uuid, (queue, has_reader, writer_count))
+        else:
+            log(uuid, "Deleting message queue")
diff --git a/test/wpt/tests/websockets/handlers/origin_wsh.py b/test/wpt/tests/websockets/handlers/origin_wsh.py
new file mode 100644
index 00000000000..ce5f3a7f6ae
--- /dev/null
+++ b/test/wpt/tests/websockets/handlers/origin_wsh.py
@@ -0,0 +1,11 @@
+#!/usr/bin/python
+
+from mod_pywebsocket import msgutil
+
+
+def web_socket_do_extra_handshake(request):
+    pass # Always accept.
+
+
+def web_socket_transfer_data(request):
+    msgutil.send_message(request, request.ws_origin)
diff --git a/test/wpt/tests/websockets/handlers/protocol_array_wsh.py b/test/wpt/tests/websockets/handlers/protocol_array_wsh.py
new file mode 100644
index 00000000000..be24ee01fd9
--- /dev/null
+++ b/test/wpt/tests/websockets/handlers/protocol_array_wsh.py
@@ -0,0 +1,14 @@
+#!/usr/bin/python
+
+from mod_pywebsocket import msgutil
+
+def web_socket_do_extra_handshake(request):
+    line = request.headers_in.get('sec-websocket-protocol')
+    request.ws_protocol = line.split(',', 1)[0]
+
+#pass
+
+def web_socket_transfer_data(request):
+    while True:
+        msgutil.send_message(request, request.ws_protocol)
+        return
diff --git a/test/wpt/tests/websockets/handlers/protocol_wsh.py b/test/wpt/tests/websockets/handlers/protocol_wsh.py
new file mode 100644
index 00000000000..10bdf33205b
--- /dev/null
+++ b/test/wpt/tests/websockets/handlers/protocol_wsh.py
@@ -0,0 +1,12 @@
+#!/usr/bin/python
+
+from mod_pywebsocket import msgutil
+
+def web_socket_do_extra_handshake(request):
+    request.ws_protocol = request.headers_in.get('sec-websocket-protocol')
+#pass
+
+def web_socket_transfer_data(request):
+    while True:
+        msgutil.send_message(request, request.ws_protocol)
+        return
diff --git a/test/wpt/tests/websockets/handlers/receive-backpressure_wsh.py b/test/wpt/tests/websockets/handlers/receive-backpressure_wsh.py
new file mode 100644
index 00000000000..9c2e4709fdd
--- /dev/null
+++ b/test/wpt/tests/websockets/handlers/receive-backpressure_wsh.py
@@ -0,0 +1,14 @@
+#!/usr/bin/python
+
+import time
+
+
+def web_socket_do_extra_handshake(request):
+    # Turn off permessage-deflate, otherwise it shrinks our 8MB buffer to 8KB.
+    request.ws_extension_processors = []
+
+
+def web_socket_transfer_data(request):
+    # Wait two seconds to cause backpressure.
+    time.sleep(2);
+    request.ws_stream.receive_message()
diff --git a/test/wpt/tests/websockets/handlers/referrer_wsh.py b/test/wpt/tests/websockets/handlers/referrer_wsh.py
new file mode 100644
index 00000000000..9df652dc3cb
--- /dev/null
+++ b/test/wpt/tests/websockets/handlers/referrer_wsh.py
@@ -0,0 +1,12 @@
+#!/usr/bin/python
+
+from mod_pywebsocket import msgutil
+
+def web_socket_do_extra_handshake(request):
+    pass
+
+def web_socket_transfer_data(request):
+    referrer = request.headers_in.get("referer")
+    if referrer is None:
+        referrer = "MISSING AS PER FETCH"
+    msgutil.send_message(request, referrer)
diff --git a/test/wpt/tests/websockets/handlers/send-backpressure_wsh.py b/test/wpt/tests/websockets/handlers/send-backpressure_wsh.py
new file mode 100644
index 00000000000..d3288d0e858
--- /dev/null
+++ b/test/wpt/tests/websockets/handlers/send-backpressure_wsh.py
@@ -0,0 +1,39 @@
+#!/usr/bin/python
+
+import time
+
+# The amount of internal buffering a WebSocket connection has is not
+# standardised, and varies depending upon the OS. Setting this number too small
+# will result in false negatives, as the entire message gets buffered. Setting
+# this number too large will result in false positives, when it takes more than
+# 2 seconds to transmit the message anyway. This number was arrived at by
+# trial-and-error.
+MESSAGE_SIZE = 1024 * 1024
+
+# With Windows 10 and Python 3, the OS will buffer an entire message in memory
+# and return from send() immediately, even if it is very large. To work around
+# this problem, send multiple messages.
+MESSAGE_COUNT = 16
+
+
+def web_socket_do_extra_handshake(request):
+    # Turn off permessage-deflate, otherwise it shrinks our big message to a
+    # tiny message.
+    request.ws_extension_processors = []
+
+
+def web_socket_transfer_data(request):
+    # Send empty message to fill the ReadableStream queue
+    request.ws_stream.send_message(b'', binary=True)
+
+    # TODO(ricea@chromium.org): Use time.perf_counter() when migration to python
+    # 3 is complete. time.time() can go backwards.
+    start_time = time.time()
+
+    # The large messages that will be blocked by backpressure.
+    for i in range(MESSAGE_COUNT):
+        request.ws_stream.send_message(b' ' * MESSAGE_SIZE, binary=True)
+
+    # Report the time taken to send the large message.
+    request.ws_stream.send_message(str(time.time() - start_time),
+                                   binary=False)
diff --git a/test/wpt/tests/websockets/handlers/set-cookie-secure_wsh.py b/test/wpt/tests/websockets/handlers/set-cookie-secure_wsh.py
new file mode 100644
index 00000000000..052a8820844
--- /dev/null
+++ b/test/wpt/tests/websockets/handlers/set-cookie-secure_wsh.py
@@ -0,0 +1,11 @@
+#!/usr/bin/python
+import urllib
+
+
+def web_socket_do_extra_handshake(request):
+    url_parts = urllib.parse.urlsplit(request.uri)
+    request.extra_headers.append(('Set-Cookie', 'ws_test_'+(url_parts.query or '')+'=test; Secure; Path=/'))
+
+def web_socket_transfer_data(request):
+    # Expect close() from user agent.
+    request.ws_stream.receive_message()
diff --git a/test/wpt/tests/websockets/handlers/set-cookie_http_wsh.py b/test/wpt/tests/websockets/handlers/set-cookie_http_wsh.py
new file mode 100644
index 00000000000..53310919642
--- /dev/null
+++ b/test/wpt/tests/websockets/handlers/set-cookie_http_wsh.py
@@ -0,0 +1,11 @@
+#!/usr/bin/python
+
+import urllib
+
+def web_socket_do_extra_handshake(request):
+    url_parts = urllib.parse.urlsplit(request.uri)
+    request.extra_headers.append(('Set-Cookie', 'ws_test_'+(url_parts.query or '')+'=test; Path=/; HttpOnly\x0D\x0ASec-WebSocket-Origin: '+request.ws_origin))
+
+def web_socket_transfer_data(request):
+    # Expect close from user agent.
+    request.ws_stream.receive_message()
diff --git a/test/wpt/tests/websockets/handlers/set-cookie_wsh.py b/test/wpt/tests/websockets/handlers/set-cookie_wsh.py
new file mode 100644
index 00000000000..5fe3ad9c573
--- /dev/null
+++ b/test/wpt/tests/websockets/handlers/set-cookie_wsh.py
@@ -0,0 +1,11 @@
+#!/usr/bin/python
+import urllib
+
+
+def web_socket_do_extra_handshake(request):
+    url_parts = urllib.parse.urlsplit(request.uri)
+    request.extra_headers.append(('Set-Cookie', 'ws_test_'+(url_parts.query or '')+'=test; Path=/'))
+
+def web_socket_transfer_data(request):
+    # Expect close from user agent.
+    request.ws_stream.receive_message()
diff --git a/test/wpt/tests/websockets/handlers/set-cookies-samesite_wsh.py b/test/wpt/tests/websockets/handlers/set-cookies-samesite_wsh.py
new file mode 100644
index 00000000000..59f0a4a598e
--- /dev/null
+++ b/test/wpt/tests/websockets/handlers/set-cookies-samesite_wsh.py
@@ -0,0 +1,25 @@
+import urllib
+
+
+def web_socket_do_extra_handshake(request):
+    url_parts = urllib.parse.urlsplit(request.uri)
+    max_age = ""
+    if "clear" in url_parts.query:
+        max_age = "; Max-Age=0"
+    value = "1"
+    if "value" in url_parts.query:
+        value = urllib.parse.parse_qs(url_parts.query)["value"][0]
+    cookies = [
+        "samesite-unspecified={}; Path=/".format(value) + max_age,
+        "samesite-lax={}; Path=/; SameSite=Lax".format(value) + max_age,
+        "samesite-strict={}; Path=/; SameSite=Strict".format(value) + max_age,
+        # SameSite=None cookies must be Secure.
+        "samesite-none={}; Path=/; SameSite=None; Secure".format(value) + max_age
+    ]
+    for cookie in cookies:
+        request.extra_headers.append(("Set-Cookie", cookie))
+
+
+def web_socket_transfer_data(request):
+    # Expect close() from user agent.
+    request.ws_stream.receive_message()
diff --git a/test/wpt/tests/websockets/handlers/simple_handshake_wsh.py b/test/wpt/tests/websockets/handlers/simple_handshake_wsh.py
new file mode 100644
index 00000000000..ad466877fe0
--- /dev/null
+++ b/test/wpt/tests/websockets/handlers/simple_handshake_wsh.py
@@ -0,0 +1,35 @@
+#!/usr/bin/python
+
+from mod_pywebsocket import common, stream
+from mod_pywebsocket.handshake import AbortedByUserException, hybi
+
+
+def web_socket_do_extra_handshake(request):
+    # Send simple response header. This test implements the handshake manually,
+    # so that we can send the header in the same packet as the close frame.
+    msg = (b'HTTP/1.1 101 Switching Protocols:\x0D\x0A'
+           b'Connection: Upgrade\x0D\x0A'
+           b'Upgrade: WebSocket\x0D\x0A'
+           b'Set-Cookie: ws_test=test\x0D\x0A'
+           b'Sec-WebSocket-Origin: %s\x0D\x0A'
+           b'Sec-WebSocket-Accept: %s\x0D\x0A\x0D\x0A') % (request.ws_origin.encode(
+               'UTF-8'), hybi.compute_accept_from_unicode(request.headers_in.get(common.SEC_WEBSOCKET_KEY_HEADER)))
+    # Create a clean close frame.
+    close_body = stream.create_closing_handshake_body(1001, 'PASS')
+    close_frame = stream.create_close_frame(close_body)
+    # Concatenate the header and the close frame and write them to the socket.
+    request.connection.write(msg + close_frame)
+    # Wait for the responding close frame from the user agent. It's not possible
+    # to use the stream methods at this point because the stream hasn't been
+    # established from pywebsocket's point of view. Instead just read the
+    # correct number of bytes.
+    # Warning: reading the wrong number of bytes here will make the test
+    # flaky.
+    MASK_LENGTH = 4
+    request.connection.read(len(close_frame) + MASK_LENGTH)
+    # Close the socket without pywebsocket sending its own handshake response.
+    raise AbortedByUserException('Abort the connection')
+
+
+def web_socket_transfer_data(request):
+    pass
diff --git a/test/wpt/tests/websockets/handlers/sleep_10_v13_wsh.py b/test/wpt/tests/websockets/handlers/sleep_10_v13_wsh.py
new file mode 100644
index 00000000000..b0f1ddeb9ad
--- /dev/null
+++ b/test/wpt/tests/websockets/handlers/sleep_10_v13_wsh.py
@@ -0,0 +1,24 @@
+#!/usr/bin/python
+
+import sys, urllib, time
+from mod_pywebsocket import msgutil
+
+def web_socket_do_extra_handshake(request):
+    request.connection.write(b'x')
+    time.sleep(2)
+    request.connection.write(b'x')
+    time.sleep(2)
+    request.connection.write(b'x')
+    time.sleep(2)
+    request.connection.write(b'x')
+    time.sleep(2)
+    request.connection.write(b'x')
+    time.sleep(2)
+    return
+
+def web_socket_transfer_data(request):
+    while True:
+        line = msgutil.receive_message(request)
+        if line == 'Goodbye':
+            return
+        request.ws_stream.send_message(line, binary=False)
diff --git a/test/wpt/tests/websockets/handlers/stash_responder_blocking_wsh.py b/test/wpt/tests/websockets/handlers/stash_responder_blocking_wsh.py
new file mode 100644
index 00000000000..10ecdfe0da9
--- /dev/null
+++ b/test/wpt/tests/websockets/handlers/stash_responder_blocking_wsh.py
@@ -0,0 +1,45 @@
+#!/usr/bin/python
+import json
+import threading
+import wptserve.stash
+from mod_pywebsocket import msgutil
+
+address, authkey = wptserve.stash.load_env_config()
+path = "/stash_responder_blocking"
+stash = wptserve.stash.Stash(path, address=address, authkey=authkey)
+cv = threading.Condition()
+
+def handle_set(key, value):
+    with cv:
+      stash.put(key, value)
+      cv.notify_all()
+
+def handle_get(key):
+    with cv:
+        while True:
+            value = stash.take(key)
+            if value is not None:
+                return value
+            cv.wait()
+
+def web_socket_do_extra_handshake(request):
+    pass
+
+def web_socket_transfer_data(request):
+    line = request.ws_stream.receive_message()
+
+    query = json.loads(line)
+    action = query["action"]
+    key = query["key"]
+
+    if action == "set":
+        value = query["value"]
+        handle_set(key, value)
+        response = {}
+    elif action == "get":
+        value = handle_get(key)
+        response = {"value": value}
+    else:
+        response = {}
+
+    msgutil.send_message(request, json.dumps(response))
diff --git a/test/wpt/tests/websockets/handlers/stash_responder_wsh.py b/test/wpt/tests/websockets/handlers/stash_responder_wsh.py
new file mode 100644
index 00000000000..d18ad3bc967
--- /dev/null
+++ b/test/wpt/tests/websockets/handlers/stash_responder_wsh.py
@@ -0,0 +1,45 @@
+#!/usr/bin/python
+import json
+import urllib
+from mod_pywebsocket import msgutil
+from wptserve import stash
+
+address, authkey = stash.load_env_config()
+stash = stash.Stash("/stash_responder", address=address, authkey=authkey)
+
+def web_socket_do_extra_handshake(request):
+    return
+
+def web_socket_transfer_data(request):
+    while True:
+        line = request.ws_stream.receive_message()
+        if line == "echo":
+            query = request.unparsed_uri.split('?')[1]
+            GET = dict(urllib.parse.parse_qsl(query))
+
+            # TODO(kristijanburnik): This code should be reused from
+            # /mixed-content/generic/expect.py or implemented more generally
+            # for other tests.
+            path = GET.get("path", request.unparsed_uri.split('?')[0])
+            key = GET["key"]
+            action = GET["action"]
+
+            if action == "put":
+              value = GET["value"]
+              stash.take(key=key, path=path)
+              stash.put(key=key, value=value, path=path)
+              response_data = json.dumps({"status": "success", "result": key})
+            elif action == "purge":
+             value = stash.take(key=key, path=path)
+             response_data = json.dumps({"status": "success", "result": value})
+            elif action == "take":
+              value = stash.take(key=key, path=path)
+              if value is None:
+                  status = "allowed"
+              else:
+                  status = "blocked"
+              response_data = json.dumps({"status": status, "result": value})
+
+            msgutil.send_message(request, response_data)
+
+            return
diff --git a/test/wpt/tests/websockets/handlers/wrong_accept_key_wsh.py b/test/wpt/tests/websockets/handlers/wrong_accept_key_wsh.py
new file mode 100644
index 00000000000..43240e1afb6
--- /dev/null
+++ b/test/wpt/tests/websockets/handlers/wrong_accept_key_wsh.py
@@ -0,0 +1,19 @@
+#!/usr/bin/python
+
+import sys, urllib, time
+
+
+def web_socket_do_extra_handshake(request):
+    msg = (b'HTTP/1.1 101 Switching Protocols:\x0D\x0A'
+           b'Connection: Upgrade\x0D\x0A'
+           b'Upgrade: WebSocket\x0D\x0A'
+           b'Sec-WebSocket-Origin: %s\x0D\x0A'
+           b'Sec-WebSocket-Accept: thisisawrongacceptkey\x0D\x0A\x0D\x0A') % request.ws_origin.encode('UTF-8')
+    request.connection.write(msg)
+    return
+
+
+def web_socket_transfer_data(request):
+    while True:
+        request.ws_stream.send_message('test', binary=False)
+        return
diff --git a/test/wpt/tests/websockets/interfaces/CloseEvent/clean-close.html b/test/wpt/tests/websockets/interfaces/CloseEvent/clean-close.html
new file mode 100644
index 00000000000..db253761f63
--- /dev/null
+++ b/test/wpt/tests/websockets/interfaces/CloseEvent/clean-close.html
@@ -0,0 +1,24 @@
+<!doctype html>
+<title>WebSockets: wasClean, true</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=../../constants.sub.js></script>
+<meta name="variant" content="">
+<meta name="variant" content="?wss">
+<meta name="variant" content="?wpt_flags=h2">
+<div id=log></div>
+<script>
+async_test(function(t) {
+  var ws = new WebSocket(SCHEME_DOMAIN_PORT+'/echo');
+  ws.onopen = t.step_func(function(e) {
+    ws.send('Test');
+  });
+  ws.onmessage = t.step_func(function(e) {
+    ws.close();
+  });
+  ws.onclose = t.step_func(function(e) {
+    assert_equals(e.wasClean,true);
+    t.done();
+  });
+});
+</script>
diff --git a/test/wpt/tests/websockets/interfaces/CloseEvent/constructor.html b/test/wpt/tests/websockets/interfaces/CloseEvent/constructor.html
new file mode 100644
index 00000000000..1ed86bdf8fd
--- /dev/null
+++ b/test/wpt/tests/websockets/interfaces/CloseEvent/constructor.html
@@ -0,0 +1,35 @@
+<!doctype html>
+<meta charset=utf-8>
+<title>CloseEvent: constructor</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<div id=log></div>
+<script>
+test(function() {
+  var event = new CloseEvent("foo");
+  assert_true(event instanceof CloseEvent, "should be a CloseEvent");
+  assert_equals(event.type, "foo");
+  assert_false(event.bubbles, "bubbles");
+  assert_false(event.cancelable, "cancelable");
+  assert_false(event.wasClean, "wasClean");
+  assert_equals(event.code, 0);
+  assert_equals(event.reason, "");
+}, "new CloseEvent() without dictionary");
+
+test(function() {
+  var event = new CloseEvent("foo", {
+    bubbles: true,
+    cancelable: true,
+    wasClean: true,
+    code: 7,
+    reason: "x",
+  });
+  assert_true(event instanceof CloseEvent, "should be a CloseEvent");
+  assert_equals(event.type, "foo");
+  assert_true(event.bubbles, "bubbles");
+  assert_true(event.cancelable, "cancelable");
+  assert_true(event.wasClean, "wasClean");
+  assert_equals(event.code, 7);
+  assert_equals(event.reason, "x");
+}, "new CloseEvent() with dictionary");
+</script>
diff --git a/test/wpt/tests/websockets/interfaces/CloseEvent/historical.html b/test/wpt/tests/websockets/interfaces/CloseEvent/historical.html
new file mode 100644
index 00000000000..24528a86fb0
--- /dev/null
+++ b/test/wpt/tests/websockets/interfaces/CloseEvent/historical.html
@@ -0,0 +1,12 @@
+<!doctype html>
+<meta charset=utf-8>
+<title>CloseEvent: historical initialization</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<div id=log></div>
+<script>
+test(function() {
+  assert_false("initCloseEvent" in CloseEvent.prototype);
+  assert_false("initCloseEvent" in new CloseEvent('close'));
+}, "initCloseEvent");
+</script>
diff --git a/test/wpt/tests/websockets/interfaces/WebSocket/bufferedAmount/bufferedAmount-arraybuffer.html b/test/wpt/tests/websockets/interfaces/WebSocket/bufferedAmount/bufferedAmount-arraybuffer.html
new file mode 100644
index 00000000000..258eaa78279
--- /dev/null
+++ b/test/wpt/tests/websockets/interfaces/WebSocket/bufferedAmount/bufferedAmount-arraybuffer.html
@@ -0,0 +1,27 @@
+<!doctype html>
+<meta charset=utf-8>
+<title>WebSockets: bufferedAmount for ArrayBuffer</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=../../../constants.sub.js></script>
+<meta name="variant" content="">
+<meta name="variant" content="?wss">
+<meta name="variant" content="?wpt_flags=h2">
+<div id=log></div>
+<script>
+async_test(function(t) {
+  var ws = new WebSocket(SCHEME_DOMAIN_PORT+'/echo');
+  var datasize = 10;
+  ws.onopen = t.step_func(function(e) {
+    ws.binaryType = "arraybuffer";
+    var data = new ArrayBuffer(datasize);
+    ws.send(data);
+    assert_equals(ws.bufferedAmount, data.byteLength);
+  })
+  ws.onmessage = t.step_func(function(e) {
+    assert_equals(e.data.byteLength, datasize);
+    t.done();
+  })
+  ws.onclose = t.unreached_func('close event should not fire');
+});
+</script>
diff --git a/test/wpt/tests/websockets/interfaces/WebSocket/bufferedAmount/bufferedAmount-blob.html b/test/wpt/tests/websockets/interfaces/WebSocket/bufferedAmount/bufferedAmount-blob.html
new file mode 100644
index 00000000000..ac5140de6cc
--- /dev/null
+++ b/test/wpt/tests/websockets/interfaces/WebSocket/bufferedAmount/bufferedAmount-blob.html
@@ -0,0 +1,28 @@
+<!doctype html>
+<meta charset=utf-8>
+<title>WebSockets: bufferedAmount for blob</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=../../../constants.sub.js></script>
+<meta name="variant" content="">
+<meta name="variant" content="?wss">
+<meta name="variant" content="?wpt_flags=h2">
+<div id=log></div>
+<script>
+async_test(function(t) {
+  var ws = new WebSocket(SCHEME_DOMAIN_PORT+'/echo');
+  var datasize = 10;
+  ws.onopen = t.step_func(function(e) {
+    ws.binaryType = "blob";
+    var data = new ArrayBuffer(datasize);
+    ws.send(data);
+    assert_equals(ws.bufferedAmount, data.byteLength);
+  });
+  ws.onmessage = t.step_func(function(e) {
+    assert_true(e.data instanceof Blob);
+    assert_equals(e.data.size, datasize);
+    t.done();
+  });
+  ws.onclose = t.unreached_func('close event should not fire');
+});
+</script>
diff --git a/test/wpt/tests/websockets/interfaces/WebSocket/bufferedAmount/bufferedAmount-defineProperty-getter.html b/test/wpt/tests/websockets/interfaces/WebSocket/bufferedAmount/bufferedAmount-defineProperty-getter.html
new file mode 100644
index 00000000000..df1c3a5bb22
--- /dev/null
+++ b/test/wpt/tests/websockets/interfaces/WebSocket/bufferedAmount/bufferedAmount-defineProperty-getter.html
@@ -0,0 +1,18 @@
+<!doctype html>
+<meta charset=utf-8>
+<title>WebSockets: defineProperty getter for bufferedAmount</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=../../../constants.sub.js></script>
+<meta name="variant" content="">
+<meta name="variant" content="?wss">
+<div id=log></div>
+<script>
+test(function(){
+  Object.defineProperty(WebSocket.prototype, 'bufferedAmount', {
+    get: function() { return 'foo'; }
+  });
+  var ws = new WebSocket('ws://example.invalid/');
+  assert_equals(ws.bufferedAmount, 'foo');
+});
+</script>
diff --git a/test/wpt/tests/websockets/interfaces/WebSocket/bufferedAmount/bufferedAmount-defineProperty-setter.html b/test/wpt/tests/websockets/interfaces/WebSocket/bufferedAmount/bufferedAmount-defineProperty-setter.html
new file mode 100644
index 00000000000..b65ed9e9b72
--- /dev/null
+++ b/test/wpt/tests/websockets/interfaces/WebSocket/bufferedAmount/bufferedAmount-defineProperty-setter.html
@@ -0,0 +1,20 @@
+<!doctype html>
+<meta charset=utf-8>
+<title>WebSockets: defineProperty setter for bufferedAmount</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=../../../constants.sub.js></script>
+<meta name="variant" content="">
+<meta name="variant" content="?wss">
+<div id=log></div>
+<script>
+test(function() {
+  window.setter_ran = false;
+  Object.defineProperty(WebSocket.prototype, 'bufferedAmount', {
+    set: function(v) { window[v] = true; }
+  });
+  var ws = new WebSocket('ws://example.invalid/');
+  ws.bufferedAmount = 'setter_ran';
+  assert_true(setter_ran);
+});
+</script>
diff --git a/test/wpt/tests/websockets/interfaces/WebSocket/bufferedAmount/bufferedAmount-deleting.html b/test/wpt/tests/websockets/interfaces/WebSocket/bufferedAmount/bufferedAmount-deleting.html
new file mode 100644
index 00000000000..0d8c456e5ca
--- /dev/null
+++ b/test/wpt/tests/websockets/interfaces/WebSocket/bufferedAmount/bufferedAmount-deleting.html
@@ -0,0 +1,23 @@
+<!doctype html>
+<meta charset=utf-8>
+<title>WebSockets: delete bufferedAmount</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=../../../constants.sub.js></script>
+<meta name="variant" content="">
+<meta name="variant" content="?wss">
+<div id=log></div>
+<script>
+test(function(){
+  var ws = new WebSocket(SCHEME_DOMAIN_PORT+'/echo');
+  assert_equals(ws.bufferedAmount, 0, 'after creation');
+  ws.close();
+  delete ws.bufferedAmount;
+  assert_equals(ws.bufferedAmount, 0,
+                'after attempt to delete ws.bufferedAmount');
+  delete WebSocket.prototype.bufferedAmount;
+  assert_equals(ws.bufferedAmount, undefined,
+                'after attempt to delete WebSocket.prototype.bufferedAmount');
+});
+</script>
+
diff --git a/test/wpt/tests/websockets/interfaces/WebSocket/bufferedAmount/bufferedAmount-getting.html b/test/wpt/tests/websockets/interfaces/WebSocket/bufferedAmount/bufferedAmount-getting.html
new file mode 100644
index 00000000000..307f595ec2d
--- /dev/null
+++ b/test/wpt/tests/websockets/interfaces/WebSocket/bufferedAmount/bufferedAmount-getting.html
@@ -0,0 +1,54 @@
+<!doctype html>
+<meta charset=utf-8>
+<title>WebSockets: bufferedAmount after send()ing</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=../../../constants.sub.js></script>
+<meta name="variant" content="">
+<meta name="variant" content="?wss">
+<meta name="variant" content="?wpt_flags=h2">
+<div id=log></div>
+<script>
+async_test(function(t){
+  // bufferedAmount should increase sync in the send() method and decrease between
+  // events in the event loop (so never while script is running).
+  var ws = new WebSocket(SCHEME_DOMAIN_PORT+'/echo');
+  ws.onopen = t.step_func(function(e) {
+    ws.send('x');
+    assert_equals(ws.bufferedAmount, 1, 'bufferedAmount after sent "x"');
+    ws.send('\u00E5');
+    assert_equals(ws.bufferedAmount, 1+2, 'bufferedAmount after sent "x", "\u00E5"');
+    ws.send('\u5336');
+    assert_equals(ws.bufferedAmount, 1+2+3, 'bufferedAmount after sent "x", "\u00E5", "\u5336"');
+    ws.send('\uD801\uDC7E');
+    assert_equals(ws.bufferedAmount, 1+2+3+4, 'bufferedAmount after sent "x", "\u00E5", "\u5336", "\uD801\uDC7E"');
+  })
+  var i = 0;
+  ws.onmessage = t.step_func(function(e) {
+    i++;
+    switch(i) {
+      case 1:
+        assert_equals(e.data, 'x');
+        assert_true(ws.bufferedAmount < 2+3+4 + 1, 'bufferedAmount after received "x"');
+        break;
+      case 2:
+        assert_equals(e.data, '\u00E5');
+        assert_true(ws.bufferedAmount < 3+4 + 1, 'bufferedAmount after received "x", "\u00E5"');
+        break;
+      case 3:
+        assert_equals(e.data, '\u5336');
+        assert_true(ws.bufferedAmount < 4 + 1, 'bufferedAmount after received "x", "\u00E5", "\u5336"');
+        break;
+      case 4:
+        assert_equals(e.data, '\uD801\uDC7E');
+        assert_equals(ws.bufferedAmount, 0, 'bufferedAmount after received "x", "\u00E5", "\u5336", "\uD801\uDC7E"');
+        t.done();
+        break;
+      default:
+        assert_unreached(i);
+    }
+  })
+  ws.onerror = ws.onclose = t.step_func(function() {assert_unreached()});
+});
+</script>
+
diff --git a/test/wpt/tests/websockets/interfaces/WebSocket/bufferedAmount/bufferedAmount-initial.html b/test/wpt/tests/websockets/interfaces/WebSocket/bufferedAmount/bufferedAmount-initial.html
new file mode 100644
index 00000000000..7c66d202826
--- /dev/null
+++ b/test/wpt/tests/websockets/interfaces/WebSocket/bufferedAmount/bufferedAmount-initial.html
@@ -0,0 +1,15 @@
+<!doctype html>
+<meta charset=utf-8>
+<title>WebSockets: getting bufferedAmount</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=../../../constants.sub.js></script>
+<meta name="variant" content="">
+<meta name="variant" content="?wss">
+<div id=log></div>
+<script>
+test(function(){
+  var ws = new WebSocket(SCHEME_DOMAIN_PORT+'/');
+  assert_equals(ws.bufferedAmount, 0);
+});
+</script>
diff --git a/test/wpt/tests/websockets/interfaces/WebSocket/bufferedAmount/bufferedAmount-large.html b/test/wpt/tests/websockets/interfaces/WebSocket/bufferedAmount/bufferedAmount-large.html
new file mode 100644
index 00000000000..e599614103b
--- /dev/null
+++ b/test/wpt/tests/websockets/interfaces/WebSocket/bufferedAmount/bufferedAmount-large.html
@@ -0,0 +1,29 @@
+<!doctype html>
+<meta charset=utf-8>
+<title>WebSockets: bufferedAmount for 65K data</title>
+<meta name=timeout content=long>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=../../../constants.sub.js></script>
+<meta name="variant" content="">
+<meta name="variant" content="?wss">
+<meta name="variant" content="?wpt_flags=h2">
+<div id=log></div>
+<script>
+async_test(function(t) {
+  var ws = new WebSocket(SCHEME_DOMAIN_PORT+'/echo');
+  var data = "";
+  ws.onopen = t.step_func(function(e) {
+    for (var i = 0; i < 65000; i++) {
+      data = data + "x";
+    }
+    ws.send(data);
+    assert_equals(data.length, ws.bufferedAmount);
+  });
+  ws.onmessage = t.step_func(function(e) {
+    assert_equals(e.data, data);
+    t.done();
+  })
+  ws.onclose = t.unreached_func('close event should not fire');
+});
+</script>
diff --git a/test/wpt/tests/websockets/interfaces/WebSocket/bufferedAmount/bufferedAmount-readonly.html b/test/wpt/tests/websockets/interfaces/WebSocket/bufferedAmount/bufferedAmount-readonly.html
new file mode 100644
index 00000000000..951aaea57b7
--- /dev/null
+++ b/test/wpt/tests/websockets/interfaces/WebSocket/bufferedAmount/bufferedAmount-readonly.html
@@ -0,0 +1,16 @@
+<!doctype html>
+<meta charset=utf-8>
+<title>WebSockets: setting bufferedAmount</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=../../../constants.sub.js></script>
+<meta name="variant" content="">
+<meta name="variant" content="?wss">
+<div id=log></div>
+<script>
+test(function(){
+  var ws = new WebSocket(SCHEME_DOMAIN_PORT+'/');
+  ws.bufferedAmount = 5;
+  assert_equals(ws.bufferedAmount, 0);
+});
+</script>
diff --git a/test/wpt/tests/websockets/interfaces/WebSocket/bufferedAmount/bufferedAmount-unicode.html b/test/wpt/tests/websockets/interfaces/WebSocket/bufferedAmount/bufferedAmount-unicode.html
new file mode 100644
index 00000000000..ba25caeb220
--- /dev/null
+++ b/test/wpt/tests/websockets/interfaces/WebSocket/bufferedAmount/bufferedAmount-unicode.html
@@ -0,0 +1,25 @@
+<!doctype html>
+<meta charset=utf-8>
+<title>WebSockets: bufferedAmount for unicode data</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=../../../constants.sub.js></script>
+<meta name="variant" content="">
+<meta name="variant" content="?wss">
+<meta name="variant" content="?wpt_flags=h2">
+<div id=log></div>
+<script>
+async_test(function(t) {
+  var ws = new WebSocket(SCHEME_DOMAIN_PORT+'/echo');
+  var data = "¥¥¥¥¥¥";
+  ws.onopen = t.step_func(function(e) {
+    ws.send(data);
+    assert_equals(data.length * 2, ws.bufferedAmount);
+  });
+  ws.onmessage = t.step_func(function(e) {
+    assert_equals(e.data, data);
+    t.done();
+  });
+  ws.onclose = t.unreached_func('close event should not fire');
+});
+</script>
diff --git a/test/wpt/tests/websockets/interfaces/WebSocket/close/close-basic.html b/test/wpt/tests/websockets/interfaces/WebSocket/close/close-basic.html
new file mode 100644
index 00000000000..b9059414954
--- /dev/null
+++ b/test/wpt/tests/websockets/interfaces/WebSocket/close/close-basic.html
@@ -0,0 +1,26 @@
+<!doctype html>
+<title>WebSockets: close()</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=../../../constants.sub.js></script>
+<meta name="variant" content="">
+<meta name="variant" content="?wss">
+<div id=log></div>
+<script>
+async_test(function(t) {
+  var ws = new WebSocket(SCHEME_DOMAIN_PORT+'/');
+  ws.onclose = t.step_func(function(e) {
+    assert_equals(e instanceof CloseEvent, true, 'e instanceof CloseEvent');
+    assert_equals(e.wasClean, false, 'e.wasClean');
+    e.wasClean = true;
+    assert_equals(e.wasClean, false, 'e.wasClean = true');
+    delete e.wasClean;
+    assert_equals(e.wasClean, false, 'delete e.wasClean');
+    delete CloseEvent.prototype.wasClean;
+    assert_equals(e.wasClean, undefined, 'delete CloseEvent.prototype.wasClean');
+    t.done();
+  });
+  ws.close();
+  assert_equals(ws.readyState, ws.CLOSING);
+});
+</script>
diff --git a/test/wpt/tests/websockets/interfaces/WebSocket/close/close-connecting.html b/test/wpt/tests/websockets/interfaces/WebSocket/close/close-connecting.html
new file mode 100644
index 00000000000..6151b7b1a76
--- /dev/null
+++ b/test/wpt/tests/websockets/interfaces/WebSocket/close/close-connecting.html
@@ -0,0 +1,25 @@
+<!doctype html>
+<title>WebSockets: close() when connecting</title>
+<meta name=timeout content=long>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=../../../constants.sub.js></script>
+<meta name="variant" content="">
+<meta name="variant" content="?wss">
+<div id=log></div>
+<script>
+async_test(function(t) {
+  var ws = new WebSocket(SCHEME_DOMAIN_PORT+'/sleep_10_v13');
+  t.step_timeout(function() {
+    assert_equals(ws.readyState, ws.CONNECTING);
+    ws.close();
+    assert_equals(ws.readyState, ws.CLOSING);
+    ws.onclose = t.step_func(function(e) {
+      assert_equals(ws.readyState, ws.CLOSED);
+      assert_equals(e.wasClean, false);
+      t.done();
+    });
+  }, 1000);
+  ws.onopen = ws.onclose = t.unreached_func();
+});
+</script>
diff --git a/test/wpt/tests/websockets/interfaces/WebSocket/close/close-multiple.html b/test/wpt/tests/websockets/interfaces/WebSocket/close/close-multiple.html
new file mode 100644
index 00000000000..7c6192555a9
--- /dev/null
+++ b/test/wpt/tests/websockets/interfaces/WebSocket/close/close-multiple.html
@@ -0,0 +1,29 @@
+<!doctype html>
+<title>WebSockets: close() several times</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=../../../constants.sub.js></script>
+<meta name="variant" content="">
+<meta name="variant" content="?wss">
+<div id=log></div>
+<script>
+var i = 0;
+async_test(function(t) {
+  var ws = new WebSocket(SCHEME_DOMAIN_PORT+'/');
+  ws.onclose = t.step_func(function(e) {
+    i++;
+  });
+  ws.close();
+  ws.close();
+  ws.close();
+  var f = t.step_func(function() {
+    if (i < 1) {
+      t.step_timeout(f, 500);
+      return;
+    }
+    assert_equals(i, 1);
+    t.done()
+  });
+  t.step_timeout(f, 500);
+});
+</script>
diff --git a/test/wpt/tests/websockets/interfaces/WebSocket/close/close-nested.html b/test/wpt/tests/websockets/interfaces/WebSocket/close/close-nested.html
new file mode 100644
index 00000000000..0a1c86ccd03
--- /dev/null
+++ b/test/wpt/tests/websockets/interfaces/WebSocket/close/close-nested.html
@@ -0,0 +1,28 @@
+<!doctype html>
+<title>WebSockets: close() in close event handler</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=../../../constants.sub.js></script>
+<meta name="variant" content="">
+<meta name="variant" content="?wss">
+<div id=log></div>
+<script>
+async_test(function(t) {
+  var ws = new WebSocket(SCHEME_DOMAIN_PORT+'/');
+  var i = 0;
+  ws.onclose = t.step_func(function(e) {
+    i++;
+    if (i == 1) {
+      assert_equals(ws.readyState, ws.CLOSED);
+      ws.close();
+      assert_equals(ws.readyState, ws.CLOSED);
+    }
+    t.step_timeout(function() {
+      assert_equals(i, 1);
+      t.done();
+    }, 50);
+  });
+  ws.close();
+  assert_equals(ws.readyState, ws.CLOSING);
+});
+</script>
diff --git a/test/wpt/tests/websockets/interfaces/WebSocket/close/close-replace.html b/test/wpt/tests/websockets/interfaces/WebSocket/close/close-replace.html
new file mode 100644
index 00000000000..3607f8d8c31
--- /dev/null
+++ b/test/wpt/tests/websockets/interfaces/WebSocket/close/close-replace.html
@@ -0,0 +1,15 @@
+<!doctype html>
+<title>WebSockets: replacing close</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=../../../constants.sub.js></script>
+<meta name="variant" content="">
+<meta name="variant" content="?wss">
+<div id=log></div>
+<script>
+test(function() {
+  var ws = new WebSocket(SCHEME_DOMAIN_PORT+'/');
+  ws.close = 5;
+  assert_equals(ws.close, 5);
+});
+</script>
diff --git a/test/wpt/tests/websockets/interfaces/WebSocket/close/close-return.html b/test/wpt/tests/websockets/interfaces/WebSocket/close/close-return.html
new file mode 100644
index 00000000000..5988605cf6c
--- /dev/null
+++ b/test/wpt/tests/websockets/interfaces/WebSocket/close/close-return.html
@@ -0,0 +1,14 @@
+<!doctype html>
+<title>WebSockets: close() return value</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=../../../constants.sub.js></script>
+<meta name="variant" content="">
+<meta name="variant" content="?wss">
+<div id=log></div>
+<script>
+test(function() {
+  var ws = new WebSocket(SCHEME_DOMAIN_PORT+'/');
+  assert_equals(ws.close(), undefined);
+});
+</script>
diff --git a/test/wpt/tests/websockets/interfaces/WebSocket/constants/001.html b/test/wpt/tests/websockets/interfaces/WebSocket/constants/001.html
new file mode 100644
index 00000000000..9701047662f
--- /dev/null
+++ b/test/wpt/tests/websockets/interfaces/WebSocket/constants/001.html
@@ -0,0 +1,17 @@
+<!doctype html>
+<title>WebSockets: getting constants on constructor</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=../../../constants.sub.js></script>
+<meta name="variant" content="">
+<meta name="variant" content="?wss">
+<div id=log></div>
+<script>
+var constants = ['CONNECTING', 'OPEN', 'CLOSING', 'CLOSED'];
+for (var i = 0; i < constants.length; ++i) {
+  test(function(){
+    var ws = new WebSocket(SCHEME_DOMAIN_PORT+'/');
+    assert_equals(WebSocket[constants[i]], i, 'WebSocket.'+constants[i]);
+  }, "Constants on constructors " + constants[i]);
+};
+</script>
diff --git a/test/wpt/tests/websockets/interfaces/WebSocket/constants/002.html b/test/wpt/tests/websockets/interfaces/WebSocket/constants/002.html
new file mode 100644
index 00000000000..46ad3b1fb1a
--- /dev/null
+++ b/test/wpt/tests/websockets/interfaces/WebSocket/constants/002.html
@@ -0,0 +1,24 @@
+<!doctype html>
+<title>WebSockets: setting constants</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=../../../constants.sub.js></script>
+<meta name="variant" content="">
+<meta name="variant" content="?wss">
+<div id=log></div>
+<script>
+// this test is testing WebIDL stuff
+var ws = new WebSocket(SCHEME_DOMAIN_PORT+'/');
+var constants = ['CONNECTING', 'OPEN', 'CLOSING', 'CLOSED'];
+for (var i = 0; i < constants.length; ++i) {
+  test(function() {
+    WebSocket[constants[i]] = 5; // should be ignored, has { ReadOnly }
+    WebSocket.prototype[constants[i]] = 5; // should be ignored, has { ReadOnly }
+    ws[constants[i]] = 5; // should be ignored, { ReadOnly } is inherited from prototype
+    assert_equals(WebSocket[constants[i]], i, 'WebSocket.'+constants[i]);
+    assert_equals(WebSocket.prototype[constants[i]], i, 'WebSocket.prototype.'+constants[i]);
+    assert_equals(ws[constants[i]], i, 'ws.'+constants[i]);
+  }, "Readonly constants " + constants[i]);
+};
+</script>
+
diff --git a/test/wpt/tests/websockets/interfaces/WebSocket/constants/003.html b/test/wpt/tests/websockets/interfaces/WebSocket/constants/003.html
new file mode 100644
index 00000000000..01127e02355
--- /dev/null
+++ b/test/wpt/tests/websockets/interfaces/WebSocket/constants/003.html
@@ -0,0 +1,22 @@
+<!doctype html>
+<title>WebSockets: deleting constants</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=../../../constants.sub.js></script>
+<meta name="variant" content="">
+<meta name="variant" content="?wss">
+<div id=log></div>
+<script>
+var constants = ['CONNECTING', 'OPEN', 'CLOSING', 'CLOSED'];
+for (var i = 0; i < constants.length; ++i) {
+  test(function(){
+    var ws = new WebSocket(SCHEME_DOMAIN_PORT+'/');
+    delete WebSocket[constants[i]]; // should be ignored, has { DontDelete }
+    delete WebSocket.prototype[constants[i]]; // should be ignored, has { DontDelete }
+    delete ws[constants[i]]; // should be ignored, there is no such property on the object
+    assert_equals(WebSocket[constants[i]], i, 'WebSocket.'+constants[i]);
+    assert_equals(WebSocket.prototype[constants[i]], i, 'WebSocket.prototype.'+constants[i]);
+    assert_equals(ws[constants[i]], i, 'ws.'+constants[i]);
+  })
+};
+</script>
diff --git a/test/wpt/tests/websockets/interfaces/WebSocket/constants/004.html b/test/wpt/tests/websockets/interfaces/WebSocket/constants/004.html
new file mode 100644
index 00000000000..035e099b656
--- /dev/null
+++ b/test/wpt/tests/websockets/interfaces/WebSocket/constants/004.html
@@ -0,0 +1,21 @@
+<!doctype html>
+<title>WebSockets: getting constants on prototype and object</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=../../../constants.sub.js></script>
+<meta name="variant" content="">
+<meta name="variant" content="?wss">
+<div id=log></div>
+<script>
+var constants = ['CONNECTING', 'OPEN', 'CLOSING', 'CLOSED'];
+for (var i = 0; i < constants.length; ++i) {
+  test(function() {
+    var ws = new WebSocket(SCHEME_DOMAIN_PORT+'/');
+    assert_equals(WebSocket.prototype[constants[i]], i);
+   }, 'WebSocket.prototype.'+constants[i]);
+   test(function() {
+    var ws = new WebSocket(SCHEME_DOMAIN_PORT+'/');
+    assert_equals(ws[constants[i]], i);
+  }, 'ws.'+constants[i]);
+};
+</script>
diff --git a/test/wpt/tests/websockets/interfaces/WebSocket/constants/005.html b/test/wpt/tests/websockets/interfaces/WebSocket/constants/005.html
new file mode 100644
index 00000000000..8e3de05a609
--- /dev/null
+++ b/test/wpt/tests/websockets/interfaces/WebSocket/constants/005.html
@@ -0,0 +1,20 @@
+<!doctype html>
+<title>WebSockets: defineProperty getter for constants</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=../../../constants.sub.js></script>
+<meta name="variant" content="">
+<meta name="variant" content="?wss">
+<div id=log></div>
+<script>
+var constants = ['CONNECTING', 'OPEN', 'CLOSING', 'CLOSED'];
+for (var i = 0; i < constants.length; ++i) {
+  test(function() {
+    assert_throws_js(TypeError, function() {
+      Object.defineProperty(WebSocket.prototype, constants[i], {
+        get: function() { return 'foo'; }
+      });
+    });
+  }, "defineProperty getter " + constants[i]);
+};
+</script>
diff --git a/test/wpt/tests/websockets/interfaces/WebSocket/constants/006.html b/test/wpt/tests/websockets/interfaces/WebSocket/constants/006.html
new file mode 100644
index 00000000000..9dcd1941593
--- /dev/null
+++ b/test/wpt/tests/websockets/interfaces/WebSocket/constants/006.html
@@ -0,0 +1,20 @@
+<!doctype html>
+<title>WebSockets: defineProperty setter for constants</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=../../../constants.sub.js></script>
+<meta name="variant" content="">
+<meta name="variant" content="?wss">
+<div id=log></div>
+<script>
+var constants = ['CONNECTING', 'OPEN', 'CLOSING', 'CLOSED'];
+for (var i = 0; i < constants.length; ++i) {
+  test(function() {
+    assert_throws_js(TypeError, function(){
+      Object.defineProperty(WebSocket.prototype, constants[i], {
+        set: function() { return 'foo'; }
+      });
+    });
+  }, "defineProperty setter " + constants[i])
+};
+</script>
diff --git a/test/wpt/tests/websockets/interfaces/WebSocket/events/001.html b/test/wpt/tests/websockets/interfaces/WebSocket/events/001.html
new file mode 100644
index 00000000000..2043f0dd847
--- /dev/null
+++ b/test/wpt/tests/websockets/interfaces/WebSocket/events/001.html
@@ -0,0 +1,18 @@
+<!doctype html>
+<title>WebSockets: getting on*</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=../../../constants.sub.js></script>
+<meta name="variant" content="">
+<meta name="variant" content="?wss">
+<meta name="variant" content="?wpt_flags=h2">
+<div id=log></div>
+<script>
+var events = ['open', 'message', 'error', 'close'];
+for (var i = 0; i < events.length; ++i) {
+  test(function(){
+    var ws = new WebSocket(SCHEME_DOMAIN_PORT+'/');
+    assert_equals(ws['on'+events[i]], null, 'on'+events[i]);
+  });
+};
+</script>
diff --git a/test/wpt/tests/websockets/interfaces/WebSocket/events/002.html b/test/wpt/tests/websockets/interfaces/WebSocket/events/002.html
new file mode 100644
index 00000000000..df8e9f73d54
--- /dev/null
+++ b/test/wpt/tests/websockets/interfaces/WebSocket/events/002.html
@@ -0,0 +1,20 @@
+<!doctype html>
+<title>WebSockets: setting on*</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=../../../constants.sub.js></script>
+<meta name="variant" content="">
+<meta name="variant" content="?wss">
+<meta name="variant" content="?wpt_flags=h2">
+<div id=log></div>
+<script>
+var events = ['open', 'message', 'error', 'close'];
+for (var i = 0; i < events.length; ++i) {
+  test(function(){
+    var ws = new WebSocket(SCHEME_DOMAIN_PORT+'/');
+    var foo = function () {};
+    ws['on'+events[i]] = foo;
+    assert_equals(ws['on'+events[i]], foo);
+  });
+}
+</script>
diff --git a/test/wpt/tests/websockets/interfaces/WebSocket/events/003.html b/test/wpt/tests/websockets/interfaces/WebSocket/events/003.html
new file mode 100644
index 00000000000..f03ab49be67
--- /dev/null
+++ b/test/wpt/tests/websockets/interfaces/WebSocket/events/003.html
@@ -0,0 +1,21 @@
+<!doctype html>
+<title>WebSockets: listening for events with onopen</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=../../../constants.sub.js></script>
+<meta name="variant" content="">
+<meta name="variant" content="?wss">
+<div id=log></div>
+<script>
+async_test(function(t) {
+  var ws = new WebSocket(SCHEME_DOMAIN_PORT+'/');
+  var foo = t.step_func(function (e) {
+    if (e.detail == 5)
+      t.done();
+  })
+  ws.onopen = foo;
+  var ev = document.createEvent('UIEvents');
+  ev.initUIEvent('open', false, false, window, 5);
+  ws.dispatchEvent(ev);
+});
+</script>
diff --git a/test/wpt/tests/websockets/interfaces/WebSocket/events/004.html b/test/wpt/tests/websockets/interfaces/WebSocket/events/004.html
new file mode 100644
index 00000000000..f3698263ed5
--- /dev/null
+++ b/test/wpt/tests/websockets/interfaces/WebSocket/events/004.html
@@ -0,0 +1,16 @@
+<!doctype html>
+<title>WebSockets: members of EventTarget</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=../../../constants.sub.js></script>
+<meta name="variant" content="">
+<meta name="variant" content="?wss">
+<div id=log></div>
+<script>
+test(function(){
+  var ws = new WebSocket(SCHEME_DOMAIN_PORT+'/');
+  assert_equals(typeof ws.addEventListener, 'function');
+  assert_equals(typeof ws.removeEventListener, 'function');
+  assert_equals(typeof ws.dispatchEvent, 'function');
+});
+</script>
diff --git a/test/wpt/tests/websockets/interfaces/WebSocket/events/006.html b/test/wpt/tests/websockets/interfaces/WebSocket/events/006.html
new file mode 100644
index 00000000000..76930516c85
--- /dev/null
+++ b/test/wpt/tests/websockets/interfaces/WebSocket/events/006.html
@@ -0,0 +1,17 @@
+<!doctype html>
+<title>WebSockets: 'on*' in ws</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=../../../constants.sub.js></script>
+<meta name="variant" content="">
+<meta name="variant" content="?wss">
+<div id=log></div>
+<script>
+test(function(){
+  var ws = new WebSocket(SCHEME_DOMAIN_PORT+'/');
+  assert_equals('onopen' in ws, true, 'onopen');
+  assert_equals('onmessage' in ws, true, 'onmessage');
+  assert_equals('onerror' in ws, true, 'onerror');
+  assert_equals('onclose' in ws, true, 'onclose');
+});
+</script>
diff --git a/test/wpt/tests/websockets/interfaces/WebSocket/events/007.html b/test/wpt/tests/websockets/interfaces/WebSocket/events/007.html
new file mode 100644
index 00000000000..c009f48a97b
--- /dev/null
+++ b/test/wpt/tests/websockets/interfaces/WebSocket/events/007.html
@@ -0,0 +1,22 @@
+<!doctype html>
+<title>WebSockets: listening for events with onmessage</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=../../../constants.sub.js></script>
+<meta name="variant" content="">
+<meta name="variant" content="?wss">
+<meta name="variant" content="?wpt_flags=h2">
+<div id=log></div>
+<script>
+async_test(function(t) {
+  var ws = new WebSocket(SCHEME_DOMAIN_PORT+'/');
+  var foo = t.step_func(function (e) {
+    if (e.detail == 5)
+      t.done();
+  })
+  ws.onmessage = foo;
+  var ev = document.createEvent('UIEvents');
+  ev.initUIEvent('message', false, false, window, 5);
+  ws.dispatchEvent(ev);
+});
+</script>
diff --git a/test/wpt/tests/websockets/interfaces/WebSocket/events/008.html b/test/wpt/tests/websockets/interfaces/WebSocket/events/008.html
new file mode 100644
index 00000000000..eb46efbb1a3
--- /dev/null
+++ b/test/wpt/tests/websockets/interfaces/WebSocket/events/008.html
@@ -0,0 +1,24 @@
+<!doctype html>
+<title>WebSockets: listening for events with onerror</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=../../../constants.sub.js></script>
+<meta name="variant" content="">
+<meta name="variant" content="?wss">
+<div id=log></div>
+<script>
+async_test(function(t) {
+  var ws = new WebSocket(SCHEME_DOMAIN_PORT+'/');
+  var run = false;
+  var foo = t.step_func(function (e) {
+    run = true;
+    assert_equals(e.detail, 5)
+  });
+  ws.onerror = foo;
+  var ev = document.createEvent('UIEvents');
+  ev.initUIEvent('error', false, false, window, 5);
+  ws.dispatchEvent(ev);
+  assert_true(run);
+  t.done();
+});
+</script>
diff --git a/test/wpt/tests/websockets/interfaces/WebSocket/events/009.html b/test/wpt/tests/websockets/interfaces/WebSocket/events/009.html
new file mode 100644
index 00000000000..1194fb8b090
--- /dev/null
+++ b/test/wpt/tests/websockets/interfaces/WebSocket/events/009.html
@@ -0,0 +1,21 @@
+<!doctype html>
+<title>WebSockets: listening for events with onclose</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=../../../constants.sub.js></script>
+<meta name="variant" content="">
+<meta name="variant" content="?wss">
+<div id=log></div>
+<script>
+async_test(function(t) {
+  var ws = new WebSocket(SCHEME_DOMAIN_PORT+'/');
+  var foo = t.step_func(function (e) {
+    if (e.detail == 5)
+      t.done();
+  });
+  ws.onclose = foo;
+  var ev = document.createEvent('UIEvents');
+  ev.initUIEvent('close', false, false, window, 5);
+  ws.dispatchEvent(ev);
+});
+</script>
diff --git a/test/wpt/tests/websockets/interfaces/WebSocket/events/010.html b/test/wpt/tests/websockets/interfaces/WebSocket/events/010.html
new file mode 100644
index 00000000000..ccdbc4dbf98
--- /dev/null
+++ b/test/wpt/tests/websockets/interfaces/WebSocket/events/010.html
@@ -0,0 +1,21 @@
+<!doctype html>
+<title>WebSockets: setting event handlers to undefined</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=../../../constants.sub.js></script>
+<meta name="variant" content="">
+<meta name="variant" content="?wss">
+<div id=log></div>
+<script>
+var events = ['onclose', 'onopen', 'onerror', 'onmessage'];
+for (var i = 0; i < events.length; ++i) {
+  test(function(){
+    var ws = new WebSocket(SCHEME_DOMAIN_PORT+'/empty-message');
+    var foo = function() {}
+    ws[events[i]] = foo;
+    assert_equals(ws[events[i]], foo, events[i]);
+    ws[events[i]] = undefined;
+    assert_equals(ws[events[i]], null, events[i]);
+  });
+}
+</script>
diff --git a/test/wpt/tests/websockets/interfaces/WebSocket/events/011.html b/test/wpt/tests/websockets/interfaces/WebSocket/events/011.html
new file mode 100644
index 00000000000..4bb0ef391c2
--- /dev/null
+++ b/test/wpt/tests/websockets/interfaces/WebSocket/events/011.html
@@ -0,0 +1,18 @@
+<!doctype html>
+<title>WebSockets: setting event handlers to 1</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=../../../constants.sub.js></script>
+<meta name="variant" content="">
+<meta name="variant" content="?wss">
+<div id=log></div>
+<script>
+var events = ['onclose', 'onopen', 'onerror', 'onmessage'];
+for (var i = 0; i < events.length; ++i) {
+  test(function(t) {
+    var ws = new WebSocket(SCHEME_DOMAIN_PORT+'/empty-message');
+    ws[events[i]] = 1;
+    assert_equals(ws[events[i]], null);
+  }, events[i]);
+};
+</script>
diff --git a/test/wpt/tests/websockets/interfaces/WebSocket/events/012.html b/test/wpt/tests/websockets/interfaces/WebSocket/events/012.html
new file mode 100644
index 00000000000..d2f39194fd9
--- /dev/null
+++ b/test/wpt/tests/websockets/interfaces/WebSocket/events/012.html
@@ -0,0 +1,18 @@
+<!doctype html>
+<title>WebSockets: setting event handlers to ";"</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=../../../constants.sub.js></script>
+<meta name="variant" content="">
+<meta name="variant" content="?wss">
+<div id=log></div>
+<script>
+var events = ['onclose', 'onopen', 'onerror', 'onmessage'];
+for (var i = 0; i < events.length; ++i) {
+  test(function(t) {
+    var ws = new WebSocket(SCHEME_DOMAIN_PORT+'/empty-message');
+    ws[events[i]] = ";";
+    assert_equals(ws[events[i]], null);
+  }, events[i]);
+};
+</script>
diff --git a/test/wpt/tests/websockets/interfaces/WebSocket/events/013.html b/test/wpt/tests/websockets/interfaces/WebSocket/events/013.html
new file mode 100644
index 00000000000..121f6e6c304
--- /dev/null
+++ b/test/wpt/tests/websockets/interfaces/WebSocket/events/013.html
@@ -0,0 +1,20 @@
+<!doctype html>
+<title>WebSockets: setting event handlers to {handleEvent:function(){}}</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=../../../constants.sub.js></script>
+<meta name="variant" content="">
+<meta name="variant" content="?wss">
+<div id=log></div>
+<script>
+var events = ['onclose', 'onopen', 'onerror', 'onmessage'];
+for (var i = 0; i < events.length; ++i) {
+  test(function(t) {
+    var ws = new WebSocket(SCHEME_DOMAIN_PORT+'/empty-message');
+    var obj = {handleEvent:this.unreached_func("handleEvent was called")};
+    ws[events[i]] = obj;
+    assert_equals(ws[events[i]], obj);
+    ws.dispatchEvent(new Event(events[i].substr(2)));
+  }, events[i]);
+};
+</script>
diff --git a/test/wpt/tests/websockets/interfaces/WebSocket/events/014.html b/test/wpt/tests/websockets/interfaces/WebSocket/events/014.html
new file mode 100644
index 00000000000..a427ce98c58
--- /dev/null
+++ b/test/wpt/tests/websockets/interfaces/WebSocket/events/014.html
@@ -0,0 +1,21 @@
+<!doctype html>
+<title>WebSockets: setting event handlers to null</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=../../../constants.sub.js></script>
+<meta name="variant" content="">
+<meta name="variant" content="?wss">
+<div id=log></div>
+<script>
+var events = ['onclose', 'onopen', 'onerror', 'onmessage'];
+for (var i = 0; i < events.length; ++i) {
+  test(function() {
+    var ws = new WebSocket(SCHEME_DOMAIN_PORT+'/empty-message');
+    var foo = function() {}
+    ws[events[i]] = foo;
+    assert_equals(ws[events[i]], foo, events[i]);
+    ws[events[i]] = null;
+    assert_equals(ws[events[i]], null, events[i]);
+  }, "Setting event handlers to null " + events[i]);
+};
+</script>
diff --git a/test/wpt/tests/websockets/interfaces/WebSocket/events/015.html b/test/wpt/tests/websockets/interfaces/WebSocket/events/015.html
new file mode 100644
index 00000000000..663ccca80d0
--- /dev/null
+++ b/test/wpt/tests/websockets/interfaces/WebSocket/events/015.html
@@ -0,0 +1,36 @@
+<!doctype html>
+<title>WebSockets: instanceof on events</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=../../../constants.sub.js></script>
+<meta name="variant" content="">
+<meta name="variant" content="?wss">
+<meta name="variant" content="?wpt_flags=h2">
+<div id=log></div>
+<script>
+async_test(function(t) {
+  var ws = new WebSocket(SCHEME_DOMAIN_PORT+'/echo_raw');
+  ws.onopen = t.step_func(function(e) {
+    assert_true(e instanceof Event);
+    // first a text frame, then a frame with reserved opcode 3
+    // which should fail the connection
+
+    // send '\\x81\\x04test\\x83\\x03LOL' in bytes
+    ws.send(new Uint8Array([129, 4, 116, 101, 115, 116, 131, 3, 76, 79, 76]));
+  });
+  ws.onmessage = t.step_func(function(e) {
+    assert_true(e instanceof Event);
+    assert_true(e instanceof MessageEvent);
+    assert_equals(ws.readyState, ws.OPEN);
+  })
+  ws.onerror = t.step_func(function(e) {
+    assert_true(e instanceof Event);
+    assert_equals(ws.readyState, ws.CLOSED);
+  })
+  ws.onclose = t.step_func(function(e) {
+    assert_true(e instanceof Event);
+    assert_true(e instanceof CloseEvent);
+    t.done();
+  })
+});
+</script>
diff --git a/test/wpt/tests/websockets/interfaces/WebSocket/events/016.html b/test/wpt/tests/websockets/interfaces/WebSocket/events/016.html
new file mode 100644
index 00000000000..fcd14c854ce
--- /dev/null
+++ b/test/wpt/tests/websockets/interfaces/WebSocket/events/016.html
@@ -0,0 +1,39 @@
+<!doctype html>
+<title>WebSockets: addEventListener</title>
+<meta name="timeout" content="long">
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=../../../constants.sub.js></script>
+<meta name="variant" content="">
+<meta name="variant" content="?wss">
+<meta name="variant" content="?wpt_flags=h2">
+<div id=log></div>
+<script>
+async_test(function(t) {
+  var ws = new WebSocket(SCHEME_DOMAIN_PORT+'/echo');
+  var count = 0;
+  var checkCount = t.step_func(function (c, e) {
+    count++;
+    assert_equals(count, c);
+  });
+  // no spec requires this order for event listeners but the web does
+  ws.addEventListener('open', t.step_func(function(e) {
+    checkCount(1, e);
+     ws.send('Goodbye');
+  }), false);
+  ws.onopen = t.step_func(function(e) {checkCount(2, e) });
+  ws.addEventListener('open', t.step_func(function(e) {checkCount(3, e); }), false);
+
+  ws.addEventListener('message', t.step_func(function(e) {checkCount(4, e); }), false);
+  ws.onmessage = t.step_func(function(e) {checkCount(5, e) });
+  ws.addEventListener('message', t.step_func(function(e) {checkCount(6, e); }), false);
+
+  ws.addEventListener('close', t.step_func(function(e) {checkCount(7, e); }), false);
+  ws.onclose = t.step_func(function(e) {checkCount(8, e) });
+  ws.addEventListener('close', t.step_func(function(e) {
+    checkCount(9, e);
+    t.done();
+  }), false);
+
+});
+</script>
diff --git a/test/wpt/tests/websockets/interfaces/WebSocket/events/017.html b/test/wpt/tests/websockets/interfaces/WebSocket/events/017.html
new file mode 100644
index 00000000000..9208261c121
--- /dev/null
+++ b/test/wpt/tests/websockets/interfaces/WebSocket/events/017.html
@@ -0,0 +1,56 @@
+<!doctype html>
+<title>WebSockets: this, e.target, e.currentTarget, e.eventPhase</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=../../../constants.sub.js></script>
+<meta name="variant" content="">
+<meta name="variant" content="?wss">
+<meta name="variant" content="?wpt_flags=h2">
+<div id=log></div>
+<script>
+async_test(function(t) {
+  var ws = new WebSocket(SCHEME_DOMAIN_PORT+'/echo_raw');
+  ws.addEventListener('open', function(e) {
+    var this_val = this;
+    t.step(function() {
+      // first a text frame, then a frame with reserved opcode 3
+      // which should fail the connection
+
+      // send '\\x81\\x04test\\x83\\x03LOL' in bytes
+      ws.send(new Uint8Array([129, 4, 116, 101, 115, 116, 131, 3, 76, 79, 76]));
+      assert_equals(this_val, ws);
+      assert_equals(e.target, ws);
+      assert_equals(e.currentTarget, ws);
+      assert_equals(e.eventPhase, 2);
+    });
+  }, false);
+  ws.addEventListener('message', function(e) {
+    var this_val = this;
+    t.step(function() {
+      assert_equals(this_val, ws);
+      assert_equals(e.target, ws);
+      assert_equals(e.currentTarget, ws);
+      assert_equals(e.eventPhase, 2);
+    });
+  }, false);
+  ws.addEventListener('error', function(e) {
+    var this_val = this;
+    t.step(function() {
+      assert_equals(this_val, ws);
+      assert_equals(e.target, ws);
+      assert_equals(e.currentTarget, ws);
+      assert_equals(e.eventPhase, 2);
+    });
+  }, false);
+  ws.addEventListener('close', function(e) {
+    var this_val = this;
+    t.step(function() {
+      assert_equals(this_val, ws);
+      assert_equals(e.target, ws);
+      assert_equals(e.currentTarget, ws);
+      assert_equals(e.eventPhase, 2);
+      t.done();
+    });
+  }, false);
+});
+</script>
diff --git a/test/wpt/tests/websockets/interfaces/WebSocket/events/018.html b/test/wpt/tests/websockets/interfaces/WebSocket/events/018.html
new file mode 100644
index 00000000000..3dc36d0c5f1
--- /dev/null
+++ b/test/wpt/tests/websockets/interfaces/WebSocket/events/018.html
@@ -0,0 +1,52 @@
+<!doctype html>
+<title>WebSockets: toString(), bubbles, cancelable</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=../../../constants.sub.js></script>
+<meta name="variant" content="">
+<meta name="variant" content="?wss">
+<meta name="variant" content="?wpt_flags=h2">
+<div id=log></div>
+<script>
+var ws = null;
+setup(function() {
+  ws = new WebSocket(SCHEME_DOMAIN_PORT+'/echo_raw');
+});
+
+async_test(function(t) {
+  let openFired = false;
+  let messageFired = false;
+  let errorFired = false;
+  ws.addEventListener('open', t.step_func(function(e) {
+    openFired = true;
+    // first a text frame, then a frame with reserved opcode 3
+    // which should fail the connection
+
+    // send '\\x81\\x04test\\x83\\x03LOL' in bytes
+    ws.send(new Uint8Array([129, 4, 116, 101, 115, 116, 131, 3, 76, 79, 76]));
+    assert_equals(e.toString(), '[object Event]', "open e.toString()");
+    assert_equals(e.bubbles, false, 'open e.bubbles');
+    assert_equals(e.cancelable, false, 'open e.cancelable');
+  }), false);
+  ws.addEventListener('message', t.step_func(function(e) {
+    messageFired = true;
+    assert_equals(e.toString(), '[object MessageEvent]', "message e.toString()");
+    assert_equals(e.bubbles, false, 'message e.bubbles');
+    assert_equals(e.cancelable, false, 'message e.cancelable');
+  }), false);
+  ws.addEventListener('error', t.step_func(function(e) {
+    errorFired = true;
+    assert_equals(e.toString(), '[object Event]', "error e.toString()");
+    assert_equals(e.bubbles, false, 'error e.bubbles');
+    assert_equals(e.cancelable, false, 'error e.cancelable');
+  }), false);
+  ws.addEventListener('close', t.step_func_done(function(e) {
+    assert_true(openFired, 'open event should fire');
+    assert_true(messageFired, 'message event should fire');
+    assert_true(errorFired, 'error event should fire');
+    assert_equals(e.toString(), '[object CloseEvent]', "close e.toString()");
+    assert_equals(e.bubbles, false, 'close e.bubbles');
+    assert_equals(e.cancelable, false, 'close e.cancelable');
+  }), false);
+}, "open, message, error and close events");
+</script>
diff --git a/test/wpt/tests/websockets/interfaces/WebSocket/events/019.html b/test/wpt/tests/websockets/interfaces/WebSocket/events/019.html
new file mode 100644
index 00000000000..cbc271d9e63
--- /dev/null
+++ b/test/wpt/tests/websockets/interfaces/WebSocket/events/019.html
@@ -0,0 +1,31 @@
+<!doctype html>
+<title>WebSockets: removeEventListener</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=../../../constants.sub.js></script>
+<meta name="variant" content="">
+<meta name="variant" content="?wss">
+<div id=log></div>
+<script>
+var events = ['open', 'message', 'error', 'close'];
+for (var i = 0; i < events.length; ++i) {
+  test(function(t) {
+    var ws = new WebSocket(SCHEME_DOMAIN_PORT+'/echo');
+    ws.close();
+    var got = [];
+    var event;
+    function addThis(e) {
+      got.push(e.type);
+    }
+    ws.addEventListener(events[i], addThis, false);
+    ws.removeEventListener(events[i], addThis, false);
+    event = document.createEvent('Event');
+    event.initEvent(events[i], false, false);
+    ws.dispatchEvent(event);
+    assert_equals(got.length, 0);
+    if (got.length) {
+      debug('Got: '+got);
+    }
+  })
+};
+</script>
diff --git a/test/wpt/tests/websockets/interfaces/WebSocket/events/020.html b/test/wpt/tests/websockets/interfaces/WebSocket/events/020.html
new file mode 100644
index 00000000000..34c1f35312b
--- /dev/null
+++ b/test/wpt/tests/websockets/interfaces/WebSocket/events/020.html
@@ -0,0 +1,17 @@
+<!doctype html>
+<title>WebSockets: error events</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=../../../constants.sub.js></script>
+<meta name="variant" content="">
+<meta name="variant" content="?wss">
+<div id=log></div>
+<script>
+async_test(function(t) {
+  var ws = new WebSocket('ws://example.invalid/');
+  ws.onerror = t.step_func(function(e) {
+    assert_true(e instanceof Event);
+    t.done();
+  })
+});
+</script>
diff --git a/test/wpt/tests/websockets/interfaces/WebSocket/extensions/001.html b/test/wpt/tests/websockets/interfaces/WebSocket/extensions/001.html
new file mode 100644
index 00000000000..4f86da57b8d
--- /dev/null
+++ b/test/wpt/tests/websockets/interfaces/WebSocket/extensions/001.html
@@ -0,0 +1,14 @@
+<!doctype html>
+<title>WebSockets: getting extensions in connecting</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=../../../constants.sub.js></script>
+<meta name="variant" content="">
+<meta name="variant" content="?wss">
+<div id=log></div>
+<script>
+test(function(t) {
+  // The extensions attribute must initially return the empty string
+  assert_equals((new WebSocket(SCHEME_DOMAIN_PORT+'/empty-message')).extensions, '');
+});
+</script>
diff --git a/test/wpt/tests/websockets/interfaces/WebSocket/protocol/protocol-initial.html b/test/wpt/tests/websockets/interfaces/WebSocket/protocol/protocol-initial.html
new file mode 100644
index 00000000000..33c123abacb
--- /dev/null
+++ b/test/wpt/tests/websockets/interfaces/WebSocket/protocol/protocol-initial.html
@@ -0,0 +1,14 @@
+<!doctype html>
+<title>WebSockets: getting protocol in connecting</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=../../../constants.sub.js></script>
+<meta name="variant" content="">
+<meta name="variant" content="?wss">
+<div id=log></div>
+<script>
+test(function(t) {
+  // The protocol attribute must initially return the empty string
+  assert_equals((new WebSocket(SCHEME_DOMAIN_PORT + '/empty-message')).protocol, '');
+});
+</script>
diff --git a/test/wpt/tests/websockets/interfaces/WebSocket/readyState/001.html b/test/wpt/tests/websockets/interfaces/WebSocket/readyState/001.html
new file mode 100644
index 00000000000..b8f96740caf
--- /dev/null
+++ b/test/wpt/tests/websockets/interfaces/WebSocket/readyState/001.html
@@ -0,0 +1,13 @@
+<!doctype html>
+<title>WebSockets: getting readyState in connecting</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=../../../constants.sub.js></script>
+<meta name="variant" content="">
+<meta name="variant" content="?wss">
+<div id=log></div>
+<script>
+test(function(t) {
+  assert_equals((new WebSocket(SCHEME_DOMAIN_PORT+'/')).readyState, WebSocket.CONNECTING);
+});
+</script>
diff --git a/test/wpt/tests/websockets/interfaces/WebSocket/readyState/002.html b/test/wpt/tests/websockets/interfaces/WebSocket/readyState/002.html
new file mode 100644
index 00000000000..b86e128059c
--- /dev/null
+++ b/test/wpt/tests/websockets/interfaces/WebSocket/readyState/002.html
@@ -0,0 +1,15 @@
+<!doctype html>
+<title>WebSockets: setting readyState</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=../../../constants.sub.js></script>
+<meta name="variant" content="">
+<meta name="variant" content="?wss">
+<div id=log></div>
+<script>
+test(function(t) {
+  var ws = new WebSocket(SCHEME_DOMAIN_PORT+'/');
+  ws.readyState = 5;
+  assert_equals(ws.readyState, ws.CONNECTING);
+});
+</script>
diff --git a/test/wpt/tests/websockets/interfaces/WebSocket/readyState/003.html b/test/wpt/tests/websockets/interfaces/WebSocket/readyState/003.html
new file mode 100644
index 00000000000..01434807217
--- /dev/null
+++ b/test/wpt/tests/websockets/interfaces/WebSocket/readyState/003.html
@@ -0,0 +1,18 @@
+<!doctype html>
+<title>WebSockets: delete readyState</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=../../../constants.sub.js></script>
+<meta name="variant" content="">
+<meta name="variant" content="?wss">
+<div id=log></div>
+<script>
+test(function(t) {
+  var ws = new WebSocket(SCHEME_DOMAIN_PORT+'/');
+  ws.close();
+  delete ws.readyState;
+  assert_equals(ws.readyState, ws.CLOSING, 'delete ws.readyState');
+  delete WebSocket.prototype.readyState;
+  assert_equals(ws.readyState, undefined, 'delete WebSocket.prototype.readyState');
+});
+</script>
diff --git a/test/wpt/tests/websockets/interfaces/WebSocket/readyState/004.html b/test/wpt/tests/websockets/interfaces/WebSocket/readyState/004.html
new file mode 100644
index 00000000000..7864f0e853d
--- /dev/null
+++ b/test/wpt/tests/websockets/interfaces/WebSocket/readyState/004.html
@@ -0,0 +1,17 @@
+<!doctype html>
+<title>WebSockets: defineProperty getter for readyState</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=../../../constants.sub.js></script>
+<meta name="variant" content="">
+<meta name="variant" content="?wss">
+<div id=log></div>
+<script>
+test(function() {
+    Object.defineProperty(WebSocket.prototype, 'readyState', {
+        get: function() { return 'foo'; }
+    });
+    var ws = new WebSocket('ws://example.invalid/');
+    assert_equals(ws.readyState, 'foo');
+});
+</script>
diff --git a/test/wpt/tests/websockets/interfaces/WebSocket/readyState/005.html b/test/wpt/tests/websockets/interfaces/WebSocket/readyState/005.html
new file mode 100644
index 00000000000..c42939316a5
--- /dev/null
+++ b/test/wpt/tests/websockets/interfaces/WebSocket/readyState/005.html
@@ -0,0 +1,19 @@
+<!doctype html>
+<title>WebSockets: defineProperty setter for readyState</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=../../../constants.sub.js></script>
+<meta name="variant" content="">
+<meta name="variant" content="?wss">
+<div id=log></div>
+<script>
+test(function(){
+  window.setter_ran = false;
+  Object.defineProperty(WebSocket.prototype, 'readyState', {
+    set: function(v) { window[v] = true; }
+  });
+  var ws = new WebSocket('ws://example.invalid/');
+  ws.readyState = 'setter_ran';
+  assert_true(setter_ran);
+});
+</script>
diff --git a/test/wpt/tests/websockets/interfaces/WebSocket/readyState/006.html b/test/wpt/tests/websockets/interfaces/WebSocket/readyState/006.html
new file mode 100644
index 00000000000..993655abd93
--- /dev/null
+++ b/test/wpt/tests/websockets/interfaces/WebSocket/readyState/006.html
@@ -0,0 +1,19 @@
+<!doctype html>
+<title>WebSockets: getting readyState in open</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=../../../constants.sub.js></script>
+<meta name="variant" content="">
+<meta name="variant" content="?wss">
+<div id=log></div>
+<script>
+async_test(function(t) {
+  var ws = new WebSocket(SCHEME_DOMAIN_PORT+'/echo');
+  ws.onopen = t.step_func(function(e) {
+    assert_equals(ws.readyState, ws.OPEN);
+    ws.close();
+    t.done();
+  });
+  ws.onerror = ws.onmessage = ws.onclose = t.step_func(function() {assert_unreached()});
+});
+</script>
diff --git a/test/wpt/tests/websockets/interfaces/WebSocket/readyState/007.html b/test/wpt/tests/websockets/interfaces/WebSocket/readyState/007.html
new file mode 100644
index 00000000000..f9ab27a4053
--- /dev/null
+++ b/test/wpt/tests/websockets/interfaces/WebSocket/readyState/007.html
@@ -0,0 +1,19 @@
+<!doctype html>
+<title>WebSockets: getting readyState in closing</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=../../../constants.sub.js></script>
+<meta name="variant" content="">
+<meta name="variant" content="?wss">
+<div id=log></div>
+<script>
+async_test(function(t) {
+  var ws = new WebSocket(SCHEME_DOMAIN_PORT+'/echo');
+  ws.onopen = t.step_func(function(e) {
+    ws.close();
+    assert_equals(ws.readyState, ws.CLOSING);
+    t.done();
+  });
+  ws.onerror = ws.onmessage = ws.onclose = t.step_func(function() {assert_unreached()});
+});
+</script>
diff --git a/test/wpt/tests/websockets/interfaces/WebSocket/readyState/008.html b/test/wpt/tests/websockets/interfaces/WebSocket/readyState/008.html
new file mode 100644
index 00000000000..5dcd362ce9a
--- /dev/null
+++ b/test/wpt/tests/websockets/interfaces/WebSocket/readyState/008.html
@@ -0,0 +1,21 @@
+<!doctype html>
+<title>WebSockets: getting readyState in closed</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=../../../constants.sub.js></script>
+<meta name="variant" content="">
+<meta name="variant" content="?wss">
+<div id=log></div>
+<script>
+async_test(function(t) {
+  var ws = new WebSocket(SCHEME_DOMAIN_PORT+'/echo');
+  ws.onopen = t.step_func(function(e) {
+    ws.onclose = t.step_func(function(e) {
+      assert_equals(ws.readyState, ws.CLOSED);
+      t.done();
+    })
+    ws.close();
+  });
+  ws.onerror = ws.onmessage = ws.onclose = t.step_func(function() {assert_unreached()});
+});
+</script>
diff --git a/test/wpt/tests/websockets/interfaces/WebSocket/send/001.html b/test/wpt/tests/websockets/interfaces/WebSocket/send/001.html
new file mode 100644
index 00000000000..e99ce7722f3
--- /dev/null
+++ b/test/wpt/tests/websockets/interfaces/WebSocket/send/001.html
@@ -0,0 +1,15 @@
+<!doctype html>
+<title>WebSockets: send() with no args</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=../../../constants.sub.js></script>
+<meta name="variant" content="">
+<meta name="variant" content="?wss">
+<div id=log></div>
+<script>
+test(function(t) {
+  var ws = new WebSocket(SCHEME_DOMAIN_PORT+'/');
+  assert_throws_js(TypeError, function(){ws.send()});
+});
+</script>
+
diff --git a/test/wpt/tests/websockets/interfaces/WebSocket/send/002.html b/test/wpt/tests/websockets/interfaces/WebSocket/send/002.html
new file mode 100644
index 00000000000..8a384df32db
--- /dev/null
+++ b/test/wpt/tests/websockets/interfaces/WebSocket/send/002.html
@@ -0,0 +1,15 @@
+<!doctype html>
+<title>WebSockets: replacing send</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=../../../constants.sub.js></script>
+<meta name="variant" content="">
+<meta name="variant" content="?wss">
+<div id=log></div>
+<script>
+test(function() {
+  var ws = new WebSocket(SCHEME_DOMAIN_PORT+'/');
+  ws.send = 5;
+  assert_equals(ws.send, 5);
+});
+</script>
diff --git a/test/wpt/tests/websockets/interfaces/WebSocket/send/003.html b/test/wpt/tests/websockets/interfaces/WebSocket/send/003.html
new file mode 100644
index 00000000000..d5aa6c57667
--- /dev/null
+++ b/test/wpt/tests/websockets/interfaces/WebSocket/send/003.html
@@ -0,0 +1,15 @@
+<!doctype html>
+<title>WebSockets: send() when readyState is CONNECTING</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=../../../constants.sub.js></script>
+<meta name="variant" content="">
+<meta name="variant" content="?wss">
+<div id=log></div>
+<script>
+test(function(t) {
+  var ws = new WebSocket(SCHEME_DOMAIN_PORT+'/');
+  assert_throws_dom("INVALID_STATE_ERR", function(){ws.send('a')});
+});
+</script>
+
diff --git a/test/wpt/tests/websockets/interfaces/WebSocket/send/004.html b/test/wpt/tests/websockets/interfaces/WebSocket/send/004.html
new file mode 100644
index 00000000000..63fd83a7e9f
--- /dev/null
+++ b/test/wpt/tests/websockets/interfaces/WebSocket/send/004.html
@@ -0,0 +1,25 @@
+<!doctype html>
+<title>WebSockets: send() with unpaired surrogate when readyState is CONNECTING</title>
+
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=../../../constants.sub.js></script>
+<meta name="variant" content="">
+<meta name="variant" content="?wss">
+<div id=log></div>
+<script>
+test(function(t) {
+  var ws = new WebSocket(SCHEME_DOMAIN_PORT+'/');
+  assert_throws_dom("INVALID_STATE_ERR", function(){ws.send('a\uDC00x')});
+}, "lone low surrogate");
+
+test(function(t) {
+  var ws = new WebSocket(SCHEME_DOMAIN_PORT+'/');
+  assert_throws_dom("INVALID_STATE_ERR", function(){ws.send('a\uD800x')});
+}, "lone high surrogate");
+
+test(function(t) {
+  var ws = new WebSocket(SCHEME_DOMAIN_PORT+'/');
+  assert_throws_dom("INVALID_STATE_ERR", function(){ws.send('a\uDC00\uD800x')});
+}, "surrogates in wrong order");
+</script>
diff --git a/test/wpt/tests/websockets/interfaces/WebSocket/send/005.html b/test/wpt/tests/websockets/interfaces/WebSocket/send/005.html
new file mode 100644
index 00000000000..ddba5bf4a3e
--- /dev/null
+++ b/test/wpt/tests/websockets/interfaces/WebSocket/send/005.html
@@ -0,0 +1,19 @@
+<!doctype html>
+<title>WebSockets: send() return value</title>
+<meta name="timeout" content="long">
+
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=../../../constants.sub.js></script>
+<meta name="variant" content="">
+<meta name="variant" content="?wss">
+<div id=log></div>
+<script>
+async_test(function(t){
+  var ws = new WebSocket(SCHEME_DOMAIN_PORT+'/echo');
+  ws.onopen = t.step_func(function(e) {
+    assert_equals(ws.send('test'), undefined);
+    t.done();
+  });
+});
+</script>
diff --git a/test/wpt/tests/websockets/interfaces/WebSocket/send/006.html b/test/wpt/tests/websockets/interfaces/WebSocket/send/006.html
new file mode 100644
index 00000000000..a7c00b154f1
--- /dev/null
+++ b/test/wpt/tests/websockets/interfaces/WebSocket/send/006.html
@@ -0,0 +1,28 @@
+<!doctype html>
+<title>WebSockets: send() with unpaired surrogate when readyState is OPEN</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=../../../constants.sub.js></script>
+<meta name="variant" content="">
+<meta name="variant" content="?wss">
+<meta name="variant" content="?wpt_flags=h2">
+<div id="log"></div>
+<script>
+async_test(function(t) {
+  var ws = new WebSocket(SCHEME_DOMAIN_PORT+'/echo');
+  ws.onopen = t.step_func(function(e) {
+    // lone low surrogate, lone high surrogate + surrogates in wrong order.
+    ws.send('a\uDC00xb\uD800xc\uDC00\uD800x');
+  })
+  ws.onmessage = t.step_func(function(e) {
+    assert_equals(e.data, 'a\uFFFDxb\uFFFDxc\uFFFD\uFFFDx');
+    ws.onclose = t.step_func(function(e) {
+      ws.onclose = t.unreached_func();
+      t.step_timeout(() => t.done(), 50);
+    });
+    ws.close();
+  })
+  // This will be overridden if the message event fires.
+  ws.onclose = t.unreached_func('close event should not fire before message event');
+ });
+</script>
diff --git a/test/wpt/tests/websockets/interfaces/WebSocket/send/007.html b/test/wpt/tests/websockets/interfaces/WebSocket/send/007.html
new file mode 100644
index 00000000000..e2a8999e2fa
--- /dev/null
+++ b/test/wpt/tests/websockets/interfaces/WebSocket/send/007.html
@@ -0,0 +1,27 @@
+<!doctype html>
+<title>WebSockets: close() followed by send()</title>
+
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=../../../constants.sub.js></script>
+<meta name="variant" content="">
+<meta name="variant" content="?wss">
+<meta name="variant" content="?wpt_flags=h2">
+<div id=log></div>
+<script>
+
+async_test(function(t) {
+  var ws = new WebSocket(SCHEME_DOMAIN_PORT+'/echo');
+  ws.onopen = t.step_func(function(e) {
+    // test that nothing strange happens if we send something after close()
+    ws.close();
+    var sent = ws.send('test');
+    assert_equals(sent, undefined);
+  });
+  ws.onclose = t.step_func(function(e) {
+    ws.onclose = t.unreached_func();
+    t.step_timeout(() => t.done(), 50);
+  });
+  ws.onerror = ws.onmessage = t.unreached_func();
+});
+</script>
diff --git a/test/wpt/tests/websockets/interfaces/WebSocket/send/008.html b/test/wpt/tests/websockets/interfaces/WebSocket/send/008.html
new file mode 100644
index 00000000000..7b6125b8c8e
--- /dev/null
+++ b/test/wpt/tests/websockets/interfaces/WebSocket/send/008.html
@@ -0,0 +1,25 @@
+<!doctype html>
+<title>WebSockets: send() in onclose</title>
+
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=../../../constants.sub.js></script>
+<meta name="variant" content="">
+<meta name="variant" content="?wss">
+<div id=log></div>
+<script>
+async_test(function(t) {
+  var ws = new WebSocket(SCHEME_DOMAIN_PORT+'/echo');
+  ws.onopen = t.step_func(function(e) {
+    ws.send('Goodbye');
+  })
+  ws.onclose = t.step_func(function(e) {
+    // test that nothing strange happens when send()ing in closed state
+    var sent = ws.send('test');
+    assert_equals(sent, undefined);
+    ws.onclose = t.unreached_func();
+    t.step_timeout(() => t.done(), 50);
+  })
+  ws.onerror = t.unreached_func();
+});
+</script>
diff --git a/test/wpt/tests/websockets/interfaces/WebSocket/send/009.html b/test/wpt/tests/websockets/interfaces/WebSocket/send/009.html
new file mode 100644
index 00000000000..65d9270ecb3
--- /dev/null
+++ b/test/wpt/tests/websockets/interfaces/WebSocket/send/009.html
@@ -0,0 +1,27 @@
+<!doctype html>
+<title>WebSockets: send('')</title>
+
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=../../../constants.sub.js></script>
+<meta name="variant" content="">
+<meta name="variant" content="?wss">
+<meta name="variant" content="?wpt_flags=h2">
+<div id=log></div>
+<script>
+async_test(function(t){
+  var ws = new WebSocket(SCHEME_DOMAIN_PORT+'/empty-message');
+  ws.onopen = t.step_func(function(e) {
+    ws.send('');
+  })
+  ws.onmessage = t.step_func(function(e) {
+    assert_equals(e.data, 'pass');
+    ws.close();
+  });
+  ws.onclose = t.step_func(function(e) {
+    ws.onclose = t.unreached_func();
+    t.step_timeout(() => t.done(), 50);
+  });
+  ws.onerror = t.unreached_func();
+});
+</script>
diff --git a/test/wpt/tests/websockets/interfaces/WebSocket/send/010.html b/test/wpt/tests/websockets/interfaces/WebSocket/send/010.html
new file mode 100644
index 00000000000..4e4f5c57b82
--- /dev/null
+++ b/test/wpt/tests/websockets/interfaces/WebSocket/send/010.html
@@ -0,0 +1,42 @@
+<!doctype html>
+<title>WebSockets: sending non-strings</title>
+<meta name="timeout" content="long">
+
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=../../../constants.sub.js></script>
+<meta name="variant" content="">
+<meta name="variant" content="?wss">
+<div id=log></div>
+<script>
+async_test(function(outer) {
+  var ws = new WebSocket(SCHEME_DOMAIN_PORT+'/echo');
+  var stuffToSend = [null, undefined, 1, window, document.body, {}, [], ws, function(){}, new Error()]
+  var tests = [];
+
+  for (var i=0; i<stuffToSend.length; i++) {
+    tests.push(async_test(document.title + " (" + stuffToSend[i] + ")"));
+  }
+
+  i = 0;
+  function sendNext() {
+    if (i === stuffToSend.length) {
+      outer.done()
+      ws.close();
+    } else {
+      var t = tests[i];
+      ws.onmessage = t.step_func(function(e) {
+         assert_equals(e.data, String(stuffToSend[i]));
+         i++;
+         sendNext();
+         t.done();
+       });
+       ws.onclose = ws.onerror = t.step_func(function() {assert_unreached()});
+       ws.send(stuffToSend[i]);
+    }
+  }
+  ws.onopen = outer.step_func(function(e) {
+    sendNext();
+  });
+}, "Constructor succeeds");
+</script>
diff --git a/test/wpt/tests/websockets/interfaces/WebSocket/send/011.html b/test/wpt/tests/websockets/interfaces/WebSocket/send/011.html
new file mode 100644
index 00000000000..bcf0422a318
--- /dev/null
+++ b/test/wpt/tests/websockets/interfaces/WebSocket/send/011.html
@@ -0,0 +1,28 @@
+<!doctype html>
+<title>WebSockets: sending non-ascii, combining chars and non-BMP</title>
+
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=../../../constants.sub.js></script>
+<meta name="variant" content="">
+<meta name="variant" content="?wss">
+<meta name="variant" content="?wpt_flags=h2">
+<div id=log></div>
+<script>
+
+async_test(function(t) {
+  var ws = new WebSocket(SCHEME_DOMAIN_PORT+'/echo');
+  ws.onopen = t.step_func(function(e) {
+    ws.send('\u00E5 a\u030A \uD801\uDC7E');
+  });
+  ws.onmessage = t.step_func(function(e) {
+    assert_equals(e.data, '\u00E5 a\u030A \uD801\uDC7E');
+    ws.onclose = t.step_func(function(e) {
+      ws.onclose = t.unreached_func();
+      t.step_timeout(() => t.done(), 50);
+    })
+    ws.close();
+  })
+  ws.onclose = ws.onerror = t.unreached_func();
+});
+</script>
diff --git a/test/wpt/tests/websockets/interfaces/WebSocket/send/012.html b/test/wpt/tests/websockets/interfaces/WebSocket/send/012.html
new file mode 100644
index 00000000000..058ab9f6214
--- /dev/null
+++ b/test/wpt/tests/websockets/interfaces/WebSocket/send/012.html
@@ -0,0 +1,28 @@
+<!doctype html>
+<title>WebSockets: sending null</title>
+
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=../../../constants.sub.js></script>
+<meta name="variant" content="">
+<meta name="variant" content="?wss">
+<meta name="variant" content="?wpt_flags=h2">
+<div id=log></div>
+<script>
+
+async_test(function(t){
+  var ws = new WebSocket(SCHEME_DOMAIN_PORT+'/echo');
+  ws.onopen = t.step_func(function(e) {
+    ws.send(null);
+  });
+  ws.onmessage = t.step_func(function(e) {
+    assert_equals(e.data, 'null');
+    ws.onclose = t.step_func(function(e) {
+      ws.onclose = t.unreached_func();
+      t.step_timeout(() => t.done(), 50);
+    })
+    ws.close();
+  });
+  ws.onclose = ws.onerror = t.unreached_func();
+});
+</script>
diff --git a/test/wpt/tests/websockets/interfaces/WebSocket/url/001.html b/test/wpt/tests/websockets/interfaces/WebSocket/url/001.html
new file mode 100644
index 00000000000..76f68b90933
--- /dev/null
+++ b/test/wpt/tests/websockets/interfaces/WebSocket/url/001.html
@@ -0,0 +1,13 @@
+<!doctype html>
+<title>WebSockets: getting url</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=../../../constants.sub.js></script>
+<meta name="variant" content="">
+<meta name="variant" content="?wss">
+<div id=log></div>
+<script>
+test(function() {
+  assert_equals((new WebSocket(SCHEME_DOMAIN_PORT)).url, SCHEME_DOMAIN_PORT+'/');
+});
+</script>
diff --git a/test/wpt/tests/websockets/interfaces/WebSocket/url/002.html b/test/wpt/tests/websockets/interfaces/WebSocket/url/002.html
new file mode 100644
index 00000000000..b7e74eecea9
--- /dev/null
+++ b/test/wpt/tests/websockets/interfaces/WebSocket/url/002.html
@@ -0,0 +1,15 @@
+<!doctype html>
+<title>WebSockets: setting url</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=../../../constants.sub.js></script>
+<meta name="variant" content="">
+<meta name="variant" content="?wss">
+<div id=log></div>
+<script>
+test(function() {
+  var ws = new WebSocket(SCHEME_DOMAIN_PORT+'/');
+  ws.url = SCHEME_DOMAIN_PORT+'/test';
+  assert_equals(ws.url, SCHEME_DOMAIN_PORT+'/');
+});
+</script>
diff --git a/test/wpt/tests/websockets/interfaces/WebSocket/url/003.html b/test/wpt/tests/websockets/interfaces/WebSocket/url/003.html
new file mode 100644
index 00000000000..5a98b50f55b
--- /dev/null
+++ b/test/wpt/tests/websockets/interfaces/WebSocket/url/003.html
@@ -0,0 +1,17 @@
+<!doctype html>
+<title>WebSockets: deleting url</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=../../../constants.sub.js></script>
+<meta name="variant" content="">
+<meta name="variant" content="?wss">
+<div id=log></div>
+<script>
+test(function() {
+  var ws = new WebSocket(SCHEME_DOMAIN_PORT+'/');
+  delete ws.url;
+  assert_equals(ws.url, SCHEME_DOMAIN_PORT+'/', 'delete ws.url');
+  delete WebSocket.prototype.url;
+  assert_equals(ws.url, undefined, 'delete WebSocket.prototype.url');
+});
+</script>
diff --git a/test/wpt/tests/websockets/interfaces/WebSocket/url/004.html b/test/wpt/tests/websockets/interfaces/WebSocket/url/004.html
new file mode 100644
index 00000000000..a3c90c73d91
--- /dev/null
+++ b/test/wpt/tests/websockets/interfaces/WebSocket/url/004.html
@@ -0,0 +1,17 @@
+<!doctype html>
+<title>WebSockets: 'URL'</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=../../../constants.sub.js></script>
+<meta name="variant" content="">
+<meta name="variant" content="?wss">
+<div id=log></div>
+<script>
+test(function() {
+  var ws = new WebSocket(SCHEME_DOMAIN_PORT+'/');
+  assert_equals(ws.URL, undefined);
+  assert_equals('URL' in ws, false);
+  assert_equals(WebSocket.prototype.URL, undefined);
+  assert_equals('URL' in WebSocket.prototype, false);
+});
+</script>
diff --git a/test/wpt/tests/websockets/interfaces/WebSocket/url/005.html b/test/wpt/tests/websockets/interfaces/WebSocket/url/005.html
new file mode 100644
index 00000000000..f897b88de0d
--- /dev/null
+++ b/test/wpt/tests/websockets/interfaces/WebSocket/url/005.html
@@ -0,0 +1,17 @@
+<!doctype html>
+<title>WebSockets: defineProperty getter for url</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=../../../constants.sub.js></script>
+<meta name="variant" content="">
+<meta name="variant" content="?wss">
+<div id=log></div>
+<script>
+test(function() {
+    Object.defineProperty(WebSocket.prototype, 'url', {
+        get: function() { return 'foo'; }
+    });
+    var ws = new WebSocket('ws://example.invalid/');
+    assert_equals(ws.url, 'foo');
+});
+</script>
diff --git a/test/wpt/tests/websockets/interfaces/WebSocket/url/006.html b/test/wpt/tests/websockets/interfaces/WebSocket/url/006.html
new file mode 100644
index 00000000000..8c4e29aa836
--- /dev/null
+++ b/test/wpt/tests/websockets/interfaces/WebSocket/url/006.html
@@ -0,0 +1,19 @@
+<!doctype html>
+<title>WebSockets: defineProperty setter for url</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=../../../constants.sub.js></script>
+<meta name="variant" content="">
+<meta name="variant" content="?wss">
+<div id=log></div>
+<script>
+test(function() {
+  window.setter_ran = false;
+    Object.defineProperty(WebSocket.prototype, 'url', {
+        set: function(v) { window[v] = true; }
+    });
+    var ws = new WebSocket('ws://example.invalid/');
+    ws.url = 'setter_ran';
+    assert_true(setter_ran);
+});
+</script>
diff --git a/test/wpt/tests/websockets/interfaces/WebSocket/url/resolve.html b/test/wpt/tests/websockets/interfaces/WebSocket/url/resolve.html
new file mode 100644
index 00000000000..0526872d56f
--- /dev/null
+++ b/test/wpt/tests/websockets/interfaces/WebSocket/url/resolve.html
@@ -0,0 +1,14 @@
+<!doctype html>
+<title>WebSocket#url: resolving</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=../../../constants.sub.js></script>
+<meta name="variant" content="">
+<meta name="variant" content="?wss">
+<div id=log></div>
+<script>
+test(function() {
+  var ws = new WebSocket(SCHEME_DOMAIN_PORT + '/echo?foo%20bar baz');
+  assert_equals(ws.url, SCHEME_DOMAIN_PORT + '/echo?foo%20bar%20baz');
+});
+</script>
diff --git a/test/wpt/tests/websockets/keeping-connection-open/001.html b/test/wpt/tests/websockets/keeping-connection-open/001.html
new file mode 100644
index 00000000000..a5d7207dec4
--- /dev/null
+++ b/test/wpt/tests/websockets/keeping-connection-open/001.html
@@ -0,0 +1,29 @@
+<!doctype html>
+<title>WebSockets: 20s inactivity after handshake</title>
+<meta name=timeout content=long>
+<p>Note: This test takes 20 seconds to run.</p>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=../constants.sub.js></script>
+<meta name="variant" content="">
+<meta name="variant" content="?wss">
+<meta name="variant" content="?wpt_flags=h2">
+<div id=log></div>
+<script>
+async_test(function(t) {
+  var ws = new WebSocket(SCHEME_DOMAIN_PORT+'/echo');
+  ws.onclose = ws.onerror = ws.onmessage = t.unreached_func();
+  ws.onopen = t.step_func(function(e) {
+    t.step_timeout(function() {
+      ws.send('test');
+      ws.onmessage = t.step_func(function(e) {
+        assert_equals(e.data, 'test');
+        ws.onclose = t.step_func(function(e) {
+          t.step_timeout(() => t.done(), 50);
+        });
+        ws.close();
+      });
+    }, 20000);
+  })
+});
+</script>
diff --git a/test/wpt/tests/websockets/multi-globals/message-received.html b/test/wpt/tests/websockets/multi-globals/message-received.html
new file mode 100644
index 00000000000..704b1e357b8
--- /dev/null
+++ b/test/wpt/tests/websockets/multi-globals/message-received.html
@@ -0,0 +1,33 @@
+<!DOCTYPE html>
+<title>"A WebSocket message has been received", with multiple globals in play</title>
+<link rel="help" href="https://html.spec.whatwg.org/multipage/comms.html#feedback-from-the-protocol">
+<link rel="author" title="Domenic Denicola" href="mailto:d@domenic.me">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+
+<!-- This is the entry global -->
+
+<iframe src="support/incumbent.sub.html"></iframe>
+
+<script>
+"use strict";
+setup({ explicit_done: true });
+
+window.onload = function() {
+    async_test(function(t) {
+        frames[0].setupWebSocket("arraybuffer", t.step_func_done(function(relevantWindow, event) {
+            assert_equals(event.constructor, relevantWindow.MessageEvent);
+            assert_equals(event.data.constructor, relevantWindow.ArrayBuffer);
+        }));
+    }, "ArrayBuffer should be created in the relevant realm of the WebSocket");
+
+    async_test(function(t) {
+        frames[0].setupWebSocket("blob", t.step_func_done(function(relevantWindow, event) {
+            assert_equals(event.constructor, relevantWindow.MessageEvent);
+            assert_equals(event.data.constructor, relevantWindow.Blob);
+        }));
+    }, "Blob should be created in the relevant realm of the WebSocket");
+
+    done();
+};
+</script>
diff --git a/test/wpt/tests/websockets/multi-globals/support/incumbent.sub.html b/test/wpt/tests/websockets/multi-globals/support/incumbent.sub.html
new file mode 100644
index 00000000000..a138b702357
--- /dev/null
+++ b/test/wpt/tests/websockets/multi-globals/support/incumbent.sub.html
@@ -0,0 +1,24 @@
+<!DOCTYPE html>
+<title>Incumbent page used as a test helper</title>
+
+<iframe src="relevant.html" id="r"></iframe>
+
+<script>
+"use strict";
+
+const relevant = document.querySelector("#r").contentWindow;
+
+window.setupWebSocket = (binaryType, fn) => {
+    const wsocket = new relevant.WebSocket("ws://{{host}}:{{ports[ws][0]}}/echo");
+
+    wsocket.addEventListener("open", () => {
+        wsocket.binaryType = binaryType;
+        wsocket.send(new ArrayBuffer(15));
+    });
+
+    wsocket.addEventListener("message", ev => {
+        fn(relevant, ev);
+    });
+};
+
+</script>
diff --git a/test/wpt/tests/websockets/multi-globals/support/relevant.html b/test/wpt/tests/websockets/multi-globals/support/relevant.html
new file mode 100644
index 00000000000..44f42eda493
--- /dev/null
+++ b/test/wpt/tests/websockets/multi-globals/support/relevant.html
@@ -0,0 +1,2 @@
+<!DOCTYPE html>
+<title>Relevant page used as a test helper</title>
diff --git a/test/wpt/tests/websockets/opening-handshake/001.html b/test/wpt/tests/websockets/opening-handshake/001.html
new file mode 100644
index 00000000000..cbc0355e2bd
--- /dev/null
+++ b/test/wpt/tests/websockets/opening-handshake/001.html
@@ -0,0 +1,20 @@
+<!doctype html>
+<title>WebSockets: invalid handshake</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=../constants.sub.js></script>
+<meta name="variant" content="">
+<meta name="variant" content="?wss">
+<meta name="variant" content="?wpt_flags=h2">
+<div id=log></div>
+<script>
+async_test(function(t) {
+  var ws = new WebSocket(SCHEME_DOMAIN_PORT+'/invalid');
+  ws.onclose = t.step_func(function(e) {
+    assert_false(e.wasClean);
+    ws.onclose = t.unreached_func();
+    t.step_timeout(() => t.done(), 50);
+  });
+   ws.onmessage = ws.onopen = t.unreached_func();
+});
+</script>
diff --git a/test/wpt/tests/websockets/opening-handshake/002.html b/test/wpt/tests/websockets/opening-handshake/002.html
new file mode 100644
index 00000000000..27b85602d44
--- /dev/null
+++ b/test/wpt/tests/websockets/opening-handshake/002.html
@@ -0,0 +1,24 @@
+<!doctype html>
+<title>WebSockets: valid handshake</title>
+<meta name=timeout content=long>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=../constants.sub.js></script>
+<meta name="variant" content="">
+<meta name="variant" content="?wss">
+<meta name="variant" content="?wpt_flags=h2">
+<div id=log></div>
+<script>
+async_test(function(t) {
+  var ws = new WebSocket(SCHEME_DOMAIN_PORT+'/echo');
+  ws.onopen = t.step_func(function(e) {
+    ws.onclose = t.step_func(function(e) {
+      assert_equals(e.wasClean, true);
+      ws.onclose = t.unreached_func();
+      t.step_timeout(() => t.done(), 50);
+    })
+    ws.close();
+  });
+  ws.onerror = ws.onmessage = ws.onclose = t.unreached_func();
+});
+</script>
diff --git a/test/wpt/tests/websockets/opening-handshake/003-sets-origin.worker.js b/test/wpt/tests/websockets/opening-handshake/003-sets-origin.worker.js
new file mode 100644
index 00000000000..d10e8cb4c49
--- /dev/null
+++ b/test/wpt/tests/websockets/opening-handshake/003-sets-origin.worker.js
@@ -0,0 +1,17 @@
+importScripts("/resources/testharness.js");
+importScripts('../constants.sub.js');
+
+async_test(function(t) {
+  var ws = new WebSocket(SCHEME_DOMAIN_PORT+'/origin');
+  ws.onmessage = t.step_func(function(e) {
+    assert_equals(e.data, location.protocol+'//'+location.host);
+    ws.onclose = t.step_func(function(e) {
+      assert_equals(e.wasClean, true);
+      ws.onclose = t.unreached_func();
+      t.step_timeout(() => t.done(), 50);
+    })
+    ws.close();
+  })
+  ws.onerror = ws.onclose = t.unreached_func();
+}, "origin set in a Worker");
+done();
diff --git a/test/wpt/tests/websockets/opening-handshake/003.html b/test/wpt/tests/websockets/opening-handshake/003.html
new file mode 100644
index 00000000000..f21219f5b5a
--- /dev/null
+++ b/test/wpt/tests/websockets/opening-handshake/003.html
@@ -0,0 +1,27 @@
+<!doctype html>
+<meta charset=utf-8>
+<title>WebSockets: origin</title>
+<meta name="timeout" content="long">
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=../constants.sub.js></script>
+<meta name="variant" content="">
+<meta name="variant" content="?wss">
+<div id=log></div>
+<script>
+async_test(function(t) {
+  const url = SCHEME_DOMAIN_PORT+'/origin',
+        ws = new WebSocket(url.replace("://", "://天気の良い日."));
+  ws.onmessage = t.step_func(function(e) {
+    assert_equals(e.origin, new URL(url).origin.replace("://", "://xn--n8j6ds53lwwkrqhv28a."))
+    assert_equals(e.data, location.protocol+'//'+location.host);
+    ws.onclose = t.step_func(function(e) {
+      assert_equals(e.wasClean, true);
+      ws.onclose = t.unreached_func();
+      t.step_timeout(() => t.done(), 50);
+    })
+    ws.close();
+  })
+  ws.onerror = ws.onclose = t.unreached_func();
+});
+</script>
diff --git a/test/wpt/tests/websockets/opening-handshake/005.html b/test/wpt/tests/websockets/opening-handshake/005.html
new file mode 100644
index 00000000000..219760c5189
--- /dev/null
+++ b/test/wpt/tests/websockets/opening-handshake/005.html
@@ -0,0 +1,25 @@
+<!doctype html>
+<title>WebSockets: response header and close frame in same packet</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=../constants.sub.js></script>
+<meta name="variant" content="">
+<meta name="variant" content="?wss">
+<div id=log></div>
+<script>
+async_test(function(t) {
+  var ws = new WebSocket(SCHEME_DOMAIN_PORT+'/simple_handshake');
+  ws.onmessage = t.unreached_func();
+  ws.onopen = t.step_func(function(e) {
+    ws.onclose = t.step_func(function(e) {
+      assert_equals(e.wasClean, true);
+      assert_equals(e.code, 1001);
+      assert_equals(e.reason, 'PASS');
+      ws.onclose = t.unreached_func('onclose should not be called twice');
+      t.step_timeout(() => t.done(), 50);
+    })
+    ws.close();
+  })
+  ws.onclose = t.unreached_func('onclose should not be called before onopen');
+});
+</script>
diff --git a/test/wpt/tests/websockets/remove-own-iframe-during-onerror.window.js b/test/wpt/tests/websockets/remove-own-iframe-during-onerror.window.js
new file mode 100644
index 00000000000..c3d5235e7c5
--- /dev/null
+++ b/test/wpt/tests/websockets/remove-own-iframe-during-onerror.window.js
@@ -0,0 +1,23 @@
+// META: script=constants.sub.js
+// META: timeout=long
+// META: variant=
+// META: variant=?wss
+// META: variant=?wpt_flags=h2
+
+async_test(t => {
+  window.wsurl = SCHEME_DOMAIN_PORT + '/does-not-exist';
+  let wsframe;
+  window.wsonerror = () => {
+    wsframe.remove();
+    // If this didn't crash then the test passed.
+    t.done();
+  };
+  wsframe = document.createElement('iframe');
+  wsframe.srcdoc = `<script>
+const ws = new WebSocket(parent.wsurl);
+ws.onerror = parent.wsonerror;
+</script>`;
+  onload = () => document.body.appendChild(wsframe);
+}, 'removing an iframe from within an onerror handler should work');
+
+done();
diff --git a/test/wpt/tests/websockets/security/001.html b/test/wpt/tests/websockets/security/001.html
new file mode 100644
index 00000000000..106c5dca629
--- /dev/null
+++ b/test/wpt/tests/websockets/security/001.html
@@ -0,0 +1,16 @@
+<!doctype html>
+<title>WebSockets: wrong accept key</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=../constants.sub.js></script>
+<meta name="variant" content="">
+<meta name="variant" content="?wss">
+<div id=log></div>
+<script>
+async_test(function(t) {
+  var ws = new WebSocket(SCHEME_DOMAIN_PORT+'/wrong_accept_key');
+  ws.onclose = t.step_func(function(e) {
+    t.done();
+  });
+});
+</script>
diff --git a/test/wpt/tests/websockets/security/002.html b/test/wpt/tests/websockets/security/002.html
new file mode 100644
index 00000000000..402af947c50
--- /dev/null
+++ b/test/wpt/tests/websockets/security/002.html
@@ -0,0 +1,20 @@
+<!doctype html>
+<title>WebSockets: check Sec-WebSocket-Key</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=../constants.sub.js></script>
+<meta name="variant" content="">
+<meta name="variant" content="?wss">
+<div id=log></div>
+<script>
+async_test(function(t) {
+  var xhr = new XMLHttpRequest();
+  xhr.onload = t.step_func(function() {
+    assert_equals(xhr.responseText, 'PASS');
+    t.done();
+  });
+  xhr.open("GET", "check.py", true);
+  xhr.setRequestHeader('Sec-WebSocket-Key', 'jW7qmdXj5Kk5jTClF1BN3');
+  xhr.send(null);
+});
+</script>
diff --git a/test/wpt/tests/websockets/security/check.py b/test/wpt/tests/websockets/security/check.py
new file mode 100644
index 00000000000..716b837f494
--- /dev/null
+++ b/test/wpt/tests/websockets/security/check.py
@@ -0,0 +1,2 @@
+def main(request, response):
+    return b"FAIL" if b'Sec-WebSocket-Key' in request.headers else b"PASS"
diff --git a/test/wpt/tests/websockets/stream/tentative/README.md b/test/wpt/tests/websockets/stream/tentative/README.md
new file mode 100644
index 00000000000..6c515887741
--- /dev/null
+++ b/test/wpt/tests/websockets/stream/tentative/README.md
@@ -0,0 +1,9 @@
+# WebSocketStream tentative tests
+
+Tests in this directory are for the proposed "WebSocketStream" interface to the
+WebSocket protocol. This is not yet standardised and browsers should not be
+expected to pass these tests.
+
+See the explainer at
+https://github.com/ricea/websocketstream-explainer/blob/master/README.md for
+more information about the API.
diff --git a/test/wpt/tests/websockets/stream/tentative/abort.any.js b/test/wpt/tests/websockets/stream/tentative/abort.any.js
new file mode 100644
index 00000000000..6742bf2b38f
--- /dev/null
+++ b/test/wpt/tests/websockets/stream/tentative/abort.any.js
@@ -0,0 +1,48 @@
+// META: script=../../constants.sub.js
+// META: script=resources/url-constants.js
+// META: script=/common/utils.js
+// META: global=window,worker
+// META: variant=?wss
+// META: variant=?wpt_flags=h2
+
+promise_test(async t => {
+  const controller = new AbortController();
+  controller.abort();
+  const key = token();
+  const wsUrl = new URL(
+      `/fetch/api/resources/stash-put.py?key=${key}&value=connected`,
+      location.href);
+  wsUrl.protocol = wsUrl.protocol.replace('http', 'ws');
+  // We intentionally use the port for the HTTP server, not the WebSocket
+  // server, because we don't expect the connection to be performed.
+  const wss = new WebSocketStream(wsUrl, { signal: controller.signal });
+  await promise_rejects_dom(t, 'AbortError', wss.connection,
+                        'connection should reject');
+  await promise_rejects_dom(t, 'AbortError', wss.closed, 'closed should reject');
+  // An incorrect implementation could pass this test due a race condition,
+  // but it is hard to completely eliminate the possibility.
+  const response = await fetch(`/fetch/api/resources/stash-take.py?key=${key}`);
+  assert_equals(await response.text(), 'null', 'response should be null');
+}, 'abort before constructing should prevent connection');
+
+promise_test(async t => {
+  const controller = new AbortController();
+  const wss = new WebSocketStream(`${BASEURL}/handshake_sleep_2`,
+                                  { signal: controller.signal });
+  // Give the connection a chance to start.
+  await new Promise(resolve => t.step_timeout(resolve, 0));
+  controller.abort();
+  await promise_rejects_dom(t, 'AbortError', wss.connection,
+                        'connection should reject');
+  await promise_rejects_dom(t, 'AbortError', wss.closed, 'closed should reject');
+}, 'abort during handshake should work');
+
+promise_test(async t => {
+  const controller = new AbortController();
+  const wss = new WebSocketStream(ECHOURL, { signal: controller.signal });
+  const { readable, writable } = await wss.connection;
+  controller.abort();
+  writable.getWriter().write('connected');
+  const { value } = await readable.getReader().read();
+  assert_equals(value, 'connected', 'value should match');
+}, 'abort after connect should do nothing');
diff --git a/test/wpt/tests/websockets/stream/tentative/backpressure-receive.any.js b/test/wpt/tests/websockets/stream/tentative/backpressure-receive.any.js
new file mode 100644
index 00000000000..cce5bf2a47e
--- /dev/null
+++ b/test/wpt/tests/websockets/stream/tentative/backpressure-receive.any.js
@@ -0,0 +1,40 @@
+// META: script=../../constants.sub.js
+// META: script=resources/url-constants.js
+// META: global=window,worker
+// META: timeout=long
+// META: variant=?wss
+// META: variant=?wpt_flags=h2
+
+// Allow for this much timer jitter.
+const JITTER_ALLOWANCE_MS = 200;
+const LARGE_MESSAGE_COUNT = 16;
+
+// This test works by using a server WebSocket handler which sends a large
+// message, and then sends a second message with the time it measured the first
+// message taking. On the browser side, we wait 2 seconds before reading from
+// the socket. This should ensure it takes at least 2 seconds to finish sending
+// the large message.
+promise_test(async t => {
+  const wss = new WebSocketStream(`${BASEURL}/send-backpressure`);
+  const { readable } = await wss.connection;
+  const reader = readable.getReader();
+
+  // Create backpressure for 2 seconds.
+  await new Promise(resolve => t.step_timeout(resolve, 2000));
+
+  // Skip the empty message used to fill the readable queue.
+  await reader.read();
+
+  // Skip the large messages.
+  for (let i = 0; i < LARGE_MESSAGE_COUNT; ++i) {
+    await reader.read();
+  }
+
+  // Read the time it took.
+  const { value, done } = await reader.read();
+
+  // A browser can pass this test simply by being slow. This may be a source of
+  // flakiness for browsers that do not implement backpressure properly.
+  assert_greater_than_equal(Number(value), 2 - JITTER_ALLOWANCE_MS / 1000,
+                            'data send should have taken at least 2 seconds');
+}, 'backpressure should be applied to received messages');
diff --git a/test/wpt/tests/websockets/stream/tentative/backpressure-send.any.js b/test/wpt/tests/websockets/stream/tentative/backpressure-send.any.js
new file mode 100644
index 00000000000..c17f1cc2b8b
--- /dev/null
+++ b/test/wpt/tests/websockets/stream/tentative/backpressure-send.any.js
@@ -0,0 +1,25 @@
+// META: script=../../constants.sub.js
+// META: script=resources/url-constants.js
+// META: global=window,worker
+// META: timeout=long
+// META: variant=?wss
+// META: variant=?wpt_flags=h2
+
+// Allow for this much timer jitter.
+const JITTER_ALLOWANCE_MS = 200;
+
+// The amount of buffering a WebSocket connection has is not standardised, but
+// it's reasonable to expect that it will not be as large as 8MB.
+const MESSAGE_SIZE = 8 * 1024 * 1024;
+
+// In this test, the server WebSocket handler waits 2 seconds, and the browser
+// times how long it takes to send the first message.
+promise_test(async t => {
+  const wss = new WebSocketStream(`${BASEURL}/receive-backpressure`);
+  const { writable } = await wss.connection;
+  const writer = writable.getWriter();
+  const start = performance.now();
+  await writer.write(new Uint8Array(MESSAGE_SIZE));
+  const elapsed = performance.now() - start;
+  assert_greater_than_equal(elapsed, 2000 - JITTER_ALLOWANCE_MS);
+}, 'backpressure should be applied to sent messages');
diff --git a/test/wpt/tests/websockets/stream/tentative/close.any.js b/test/wpt/tests/websockets/stream/tentative/close.any.js
new file mode 100644
index 00000000000..0ed91cc8a64
--- /dev/null
+++ b/test/wpt/tests/websockets/stream/tentative/close.any.js
@@ -0,0 +1,186 @@
+// META: script=../../constants.sub.js
+// META: script=resources/url-constants.js
+// META: global=window,worker
+// META: variant=?wss
+// META: variant=?wpt_flags=h2
+
+promise_test(async () => {
+  const wss = new WebSocketStream(ECHOURL);
+  await wss.connection;
+  wss.close({code: 3456, reason: 'pizza'});
+  const { code, reason } = await wss.closed;
+  assert_equals(code, 3456, 'code should match');
+  assert_equals(reason, 'pizza', 'reason should match');
+}, 'close code should be sent to server and reflected back');
+
+promise_test(async () => {
+  const wss = new WebSocketStream(ECHOURL);
+  await wss.connection;
+  wss.close();
+  const { code, reason } = await wss.closed;
+  assert_equals(code, 1005, 'code should be unset');
+  assert_equals(reason, '', 'reason should be empty');
+}, 'no close argument should send empty Close frame');
+
+promise_test(async () => {
+  const wss = new WebSocketStream(ECHOURL);
+  await wss.connection;
+  wss.close({});
+  const { code, reason } = await wss.closed;
+  assert_equals(code, 1005, 'code should be unset');
+  assert_equals(reason, '', 'reason should be empty');
+}, 'unspecified close code should send empty Close frame');
+
+promise_test(async () => {
+  const wss = new WebSocketStream(ECHOURL);
+  await wss.connection;
+  wss.close({reason: ''});
+  const { code, reason } = await wss.closed;
+  assert_equals(code, 1005, 'code should be unset');
+  assert_equals(reason, '', 'reason should be empty');
+}, 'unspecified close code with empty reason should send empty Close frame');
+
+promise_test(async () => {
+  const wss = new WebSocketStream(ECHOURL);
+  await wss.connection;
+  wss.close({reason: 'non-empty'});
+  const { code, reason } = await wss.closed;
+  assert_equals(code, 1000, 'code should be set');
+  assert_equals(reason, 'non-empty', 'reason should match');
+}, 'unspecified close code with non-empty reason should set code to 1000');
+
+promise_test(async () => {
+  const wss = new WebSocketStream(ECHOURL);
+  await wss.connection;
+  assert_throws_js(TypeError, () => wss.close(true),
+                   'close should throw a TypeError');
+}, 'close(true) should throw a TypeError');
+
+promise_test(async () => {
+  const wss = new WebSocketStream(ECHOURL);
+  await wss.connection;
+  const reason = '.'.repeat(124);
+  assert_throws_dom('SyntaxError', () => wss.close({ reason }),
+                    'close should throw a TypeError');
+}, 'close() with an overlong reason should throw');
+
+promise_test(t => {
+  const wss = new WebSocketStream(ECHOURL);
+  wss.close();
+  return Promise.all([
+    promise_rejects_dom(t, 'NetworkError', wss.connection,
+                    'connection promise should reject'),
+    promise_rejects_dom(t, 'NetworkError', wss.closed,
+                    'closed promise should reject')]);
+}, 'close during handshake should work');
+
+for (const invalidCode of [999, 1001, 2999, 5000]) {
+  promise_test(async () => {
+    const wss = new WebSocketStream(ECHOURL);
+    await wss.connection;
+    assert_throws_dom('InvalidAccessError', () => wss.close({ code: invalidCode }),
+                      'close should throw a TypeError');
+  }, `close() with invalid code ${invalidCode} should throw`);
+}
+
+promise_test(async () => {
+  const wss = new WebSocketStream(ECHOURL);
+  const { writable } = await wss.connection;
+  writable.getWriter().close();
+  const { code, reason } = await wss.closed;
+  assert_equals(code, 1005, 'code should be unset');
+  assert_equals(reason, '', 'reason should be empty');
+}, 'closing the writable should result in a clean close');
+
+promise_test(async () => {
+  const wss = new WebSocketStream(`${BASEURL}/delayed-passive-close`);
+  const { writable } = await wss.connection;
+  const startTime = performance.now();
+  await writable.getWriter().close();
+  const elapsed = performance.now() - startTime;
+  const jitterAllowance = 100;
+  assert_greater_than_equal(elapsed, 1000 - jitterAllowance,
+                            'one second should have elapsed');
+}, 'writer close() promise should not resolve until handshake completes');
+
+const abortOrCancel = [
+  {
+    method: 'abort',
+    voweling: 'aborting',
+    stream: 'writable',
+  },
+  {
+    method: 'cancel',
+    voweling: 'canceling',
+    stream: 'readable',
+  },
+];
+
+for (const { method, voweling, stream } of abortOrCancel) {
+
+  promise_test(async () => {
+    const wss = new WebSocketStream(ECHOURL);
+    const info = await wss.connection;
+    info[stream][method]();
+    const { code, reason } = await wss.closed;
+    assert_equals(code, 1005, 'code should be unset');
+    assert_equals(reason, '', 'reason should be empty');
+  }, `${voweling} the ${stream} should result in a clean close`);
+
+  promise_test(async () => {
+    const wss = new WebSocketStream(ECHOURL);
+    const info = await wss.connection;
+    info[stream][method]({ code: 3333 });
+    const { code, reason } = await wss.closed;
+    assert_equals(code, 3333, 'code should be used');
+    assert_equals(reason, '', 'reason should be empty');
+  }, `${voweling} the ${stream} with a code should send that code`);
+
+  promise_test(async () => {
+    const wss = new WebSocketStream(ECHOURL);
+    const info = await wss.connection;
+    info[stream][method]({ code: 3456, reason: 'set' });
+    const { code, reason } = await wss.closed;
+    assert_equals(code, 3456, 'code should be used');
+    assert_equals(reason, 'set', 'reason should be used');
+  }, `${voweling} the ${stream} with a code and reason should use them`);
+
+  promise_test(async () => {
+    const wss = new WebSocketStream(ECHOURL);
+    const info = await wss.connection;
+    info[stream][method]({ reason: 'specified' });
+    const { code, reason } = await wss.closed;
+    assert_equals(code, 1005, 'code should be unset');
+    assert_equals(reason, '', 'reason should be empty');
+  }, `${voweling} the ${stream} with a reason but no code should be ignored`);
+
+  promise_test(async () => {
+    const wss = new WebSocketStream(ECHOURL);
+    const info = await wss.connection;
+    info[stream][method]({ code: 999 });
+    const { code, reason } = await wss.closed;
+    assert_equals(code, 1005, 'code should be unset');
+    assert_equals(reason, '', 'reason should be empty');
+  }, `${voweling} the ${stream} with an invalid code should be ignored`);
+
+  promise_test(async () => {
+    const wss = new WebSocketStream(ECHOURL);
+    const info = await wss.connection;
+    info[stream][method]({ code: 1000, reason: 'x'.repeat(128) });
+    const { code, reason } = await wss.closed;
+    assert_equals(code, 1005, 'code should be unset');
+    assert_equals(reason, '', 'reason should be empty');
+  }, `${voweling} the ${stream} with an invalid reason should be ignored`);
+
+  // DOMExceptions are only ignored because the |code| attribute is too small to
+  // be a valid WebSocket close code.
+  promise_test(async () => {
+    const wss = new WebSocketStream(ECHOURL);
+    const info = await wss.connection;
+    info[stream][method](new DOMException('yes', 'DataCloneError'));
+    const { code, reason } = await wss.closed;
+    assert_equals(code, 1005, 'code should be unset');
+    assert_equals(reason, '', 'reason should be empty');
+  }, `${voweling} the ${stream} with a DOMException should be ignored`);
+
+}
diff --git a/test/wpt/tests/websockets/stream/tentative/constructor.any.js b/test/wpt/tests/websockets/stream/tentative/constructor.any.js
new file mode 100644
index 00000000000..454dd4c0942
--- /dev/null
+++ b/test/wpt/tests/websockets/stream/tentative/constructor.any.js
@@ -0,0 +1,68 @@
+// META: script=../../constants.sub.js
+// META: script=resources/url-constants.js
+// META: global=window,worker
+// META: variant=?wss
+// META: variant=?wpt_flags=h2
+
+test(() => {
+  assert_throws_js(TypeError, () => new WebSocketStream(),
+                'constructor should throw');
+}, 'constructing with no URL should throw');
+
+test(() => {
+  assert_throws_dom("SyntaxError", () => new WebSocketStream('invalid:'),
+                    "constructor should throw");
+}, 'constructing with an invalid URL should throw');
+
+test(() => {
+  assert_throws_js(TypeError,
+                () => new WebSocketStream(`${BASEURL}/`, true),
+                "constructor should throw");
+}, 'constructing with invalid options should throw');
+
+test(() => {
+  assert_throws_js(TypeError,
+                () => new WebSocketStream(`${BASEURL}/`, {protocols: 'hi'}),
+                "constructor should throw");
+}, 'protocols should be required to be a list');
+
+promise_test(async () => {
+  const wss = new WebSocketStream(ECHOURL);
+  await wss.connection;
+  assert_equals(wss.url, ECHOURL, 'url should match');
+  wss.close();
+}, 'constructing with a valid URL should work');
+
+promise_test(async () => {
+  const wss = new WebSocketStream(`${BASEURL}/protocol_array`,
+                                  {protocols: ['alpha', 'beta']});
+  const { readable, protocol } = await wss.connection;
+  assert_equals(protocol, 'alpha', 'protocol should be right');
+  const reader = readable.getReader();
+  const { value, done } = await reader.read();
+  assert_equals(value, 'alpha', 'message contents should match');
+  wss.close();
+}, 'setting a protocol in the constructor should work');
+
+promise_test(t => {
+  const wss = new WebSocketStream(`${BASEURL}/404`);
+  return Promise.all([
+    promise_rejects_dom(t, 'NetworkError', wss.connection,
+                    'connection should reject'),
+    promise_rejects_dom(t, 'NetworkError', wss.closed, 'closed should reject')
+  ]);
+}, 'connection failure should reject the promises');
+
+promise_test(async () => {
+  const wss = new WebSocketStream(ECHOURL);
+  const { readable, writable, protocol, extensions} = await wss.connection;
+  // Verify that |readable| really is a ReadableStream using the getReader()
+  // brand check. If it doesn't throw the test passes.
+  ReadableStream.prototype.getReader.call(readable);
+  // Verify that |writable| really is a WritableStream using the getWriter()
+  // brand check. If it doesn't throw the test passes.
+  WritableStream.prototype.getWriter.call(writable);
+  assert_equals(typeof protocol, 'string', 'protocol should be a string');
+  assert_equals(typeof extensions, 'string', 'extensions should be a string');
+  wss.close();
+}, 'wss.connection should resolve to the right types');
diff --git a/test/wpt/tests/websockets/stream/tentative/resources/url-constants.js b/test/wpt/tests/websockets/stream/tentative/resources/url-constants.js
new file mode 100644
index 00000000000..fe681af5c42
--- /dev/null
+++ b/test/wpt/tests/websockets/stream/tentative/resources/url-constants.js
@@ -0,0 +1,8 @@
+// The file including this must also include ../constants.sub.js to pick up the
+// necessary constants.
+
+const {BASEURL, ECHOURL} = (() => {
+  const BASEURL = SCHEME_DOMAIN_PORT;
+  const ECHOURL = `${BASEURL}/echo`;
+  return {BASEURL, ECHOURL};
+})();
diff --git a/test/wpt/tests/websockets/unload-a-document/001-1.html b/test/wpt/tests/websockets/unload-a-document/001-1.html
new file mode 100644
index 00000000000..7cf4ab6ff8f
--- /dev/null
+++ b/test/wpt/tests/websockets/unload-a-document/001-1.html
@@ -0,0 +1,25 @@
+<!doctype html>
+<title>WebSockets: navigating top-level browsing context</title>
+<script src=../constants.sub.js></script>
+<script>
+var controller = opener || parent;
+var t = controller.t;
+var assert_unreached = controller.assert_unreached;
+var uuid = controller.uuid;
+t.add_cleanup(function() {delete sessionStorage[uuid];});
+t.step(function() {
+  if (sessionStorage[uuid]) {
+    t.done();
+  } else {
+    sessionStorage[uuid] = 'true';
+    var ws = new WebSocket(SCHEME_DOMAIN_PORT+'/echo');
+    ws.onopen = t.step_func(function(e) {
+      t.step_timeout(function() {
+        assert_unreached('document was not discarded');
+      }, 1000);
+      controller.navigate();
+    })
+    ws.onerror = ws.onmessage = t.step_func(e => assert_unreached("Got unexpected event " + e.type));
+  }
+});
+</script>
diff --git a/test/wpt/tests/websockets/unload-a-document/001-2.html b/test/wpt/tests/websockets/unload-a-document/001-2.html
new file mode 100644
index 00000000000..24c419ce185
--- /dev/null
+++ b/test/wpt/tests/websockets/unload-a-document/001-2.html
@@ -0,0 +1,4 @@
+<!doctype html>
+<title>WebSockets: navigating top-level browsing context</title>
+<body onload="history.back()"></body>
+</html>
diff --git a/test/wpt/tests/websockets/unload-a-document/001.html b/test/wpt/tests/websockets/unload-a-document/001.html
new file mode 100644
index 00000000000..e7cc60d593b
--- /dev/null
+++ b/test/wpt/tests/websockets/unload-a-document/001.html
@@ -0,0 +1,26 @@
+<!doctype html>
+<title>WebSockets: navigating top-level browsing context</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=/common/utils.js></script>
+<script src=../constants.sub.js></script>
+<meta name="variant" content="">
+<meta name="variant" content="?wss">
+<meta name="variant" content="?wpt_flags=h2">
+<p>Test requires popup blocker disabled</p>
+<div id=log></div>
+<script>
+var t = async_test();
+var w;
+var uuid;
+t.step(function() {
+  uuid = token()
+  w = window.open("001-1.html" + location.search);
+  add_result_callback(function() {
+    w.close();
+  });
+});
+navigate = t.step_func(function() {
+  w.location = w.location.href.replace("001-1.html", "001-2.html");
+});
+</script>
diff --git a/test/wpt/tests/websockets/unload-a-document/002-1.html b/test/wpt/tests/websockets/unload-a-document/002-1.html
new file mode 100644
index 00000000000..1922bb4caed
--- /dev/null
+++ b/test/wpt/tests/websockets/unload-a-document/002-1.html
@@ -0,0 +1,32 @@
+<!doctype html>
+<title>WebSockets: navigating top-level browsing context with closed websocket</title>
+<script src=../constants.sub.js></script>
+<script>
+var controller = opener || parent;
+var t = controller.t;
+var assert_equals = controller.assert_equals;
+var assert_unreached = controller.assert_unreached ;
+var uuid = controller.uuid;
+t.add_cleanup(function() {delete sessionStorage[uuid];});
+t.step(function() {
+  // this test can fail if the document is unloaded on navigation e.g. due to OOM
+  if (sessionStorage[uuid]) {
+    assert_unreached('document was discarded');
+  } else {
+    sessionStorage[uuid] = 'true';
+    var ws = new WebSocket(SCHEME_DOMAIN_PORT+'/echo');
+    ws.onopen = t.step_func(function(e) {
+
+      t.step_timeout(function() {
+        assert_equals(ws.readyState, ws.CLOSED, 'ws.readyState');
+        t.done();
+      }, 4000);
+      ws.close();
+      ws.onclose = t.step_func(function() {
+        controller.navigate();
+      });
+    })
+    ws.onerror = ws.onmessage = t.step_func(e => assert_unreached("Got unexpected event " + e.type));
+  }
+});
+</script>
diff --git a/test/wpt/tests/websockets/unload-a-document/002-2.html b/test/wpt/tests/websockets/unload-a-document/002-2.html
new file mode 100644
index 00000000000..9a246a1dd8d
--- /dev/null
+++ b/test/wpt/tests/websockets/unload-a-document/002-2.html
@@ -0,0 +1,4 @@
+<!doctype html>
+<title>WebSockets: navigating top-level browsing context with closed websocket</title>
+<body onload="history.back()"></body>
+</html>
diff --git a/test/wpt/tests/websockets/unload-a-document/002.html b/test/wpt/tests/websockets/unload-a-document/002.html
new file mode 100644
index 00000000000..013f5266bf9
--- /dev/null
+++ b/test/wpt/tests/websockets/unload-a-document/002.html
@@ -0,0 +1,27 @@
+<!doctype html>
+<title>WebSockets: navigating top-level browsing context with closed websocket</title>
+<meta name=timeout content=long>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=/common/utils.js></script>
+<script src=../constants.sub.js></script>
+<meta name="variant" content="">
+<meta name="variant" content="?wss">
+<meta name="variant" content="?wpt_flags=h2">
+<p>Test requires popup blocker disabled</p>
+<div id=log></div>
+<script>
+var t = async_test();
+var w;
+var uuid;
+t.step(function() {
+  uuid = token()
+  w = window.open("002-1.html" + location.search);
+  add_result_callback(function() {
+    w.close();
+  });
+});
+navigate = t.step_func(function() {
+  w.location = w.location.href.replace("002-1.html", "002-2.html");
+});
+</script>
diff --git a/test/wpt/tests/websockets/unload-a-document/003.html b/test/wpt/tests/websockets/unload-a-document/003.html
new file mode 100644
index 00000000000..554daf458a9
--- /dev/null
+++ b/test/wpt/tests/websockets/unload-a-document/003.html
@@ -0,0 +1,14 @@
+<!doctype html>
+<title>WebSockets: navigating nested browsing context</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=/common/utils.js></script>
+<div id=log></div>
+<script>
+var uuid;
+var t = async_test(function() {uuid = token()});
+var navigate = t.step_func(function() {
+  document.getElementsByTagName("iframe")[0].src = 'data:text/html,<body onload="history.back()">';
+});
+</script>
+<iframe src=001-1.html></iframe>
\ No newline at end of file
diff --git a/test/wpt/tests/websockets/unload-a-document/004.html b/test/wpt/tests/websockets/unload-a-document/004.html
new file mode 100644
index 00000000000..bb15cd8ef92
--- /dev/null
+++ b/test/wpt/tests/websockets/unload-a-document/004.html
@@ -0,0 +1,16 @@
+<!doctype html>
+<title>WebSockets: navigating nested browsing context with closed websocket</title>
+<meta name=timeout content=long>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=/common/utils.js></script>
+<div id=log></div>
+<script>
+var uuid;
+var t = async_test();
+t.step(function() {uuid = token()});
+var navigate = t.step_func(function() {
+  document.getElementsByTagName("iframe")[0].src = 'data:text/html,<body onload="history.back()">';
+});
+</script>
+<iframe src=002-1.html></iframe>
diff --git a/test/wpt/tests/websockets/unload-a-document/005-1.html b/test/wpt/tests/websockets/unload-a-document/005-1.html
new file mode 100644
index 00000000000..e084ade7e52
--- /dev/null
+++ b/test/wpt/tests/websockets/unload-a-document/005-1.html
@@ -0,0 +1,22 @@
+<!doctype html>
+<title>WebSockets: navigating nested browsing context with a websocket in top-level</title>
+<script src=../constants.sub.js></script>
+<script>
+var t = opener.t;
+var assert_unreached = opener.assert_unreached;
+var hasRun = false;
+function run(){
+  var ws = new WebSocket(SCHEME_DOMAIN_PORT+'/echo');
+  ws.onopen = t.step_func(function(e) {
+    t.step_timeout(function() {
+      ws.send('test');
+    }, 1000);
+    window[0].location = 'data:text/html,<body onload="history.back()">';
+    ws.onmessage = t.step_func_done(function(e) {
+      ws.close();
+    });
+  });
+  ws.onerror = ws.onmessage = ws.onclose = t.step_func(e => assert_unreached("Got unexpected event " + e.type));
+}
+</script>
+<iframe src='data:text/html,foo' onload='if (hasRun) return; hasRun = true; t.step(run)'></iframe>
diff --git a/test/wpt/tests/websockets/unload-a-document/005.html b/test/wpt/tests/websockets/unload-a-document/005.html
new file mode 100644
index 00000000000..fc4b02cbb29
--- /dev/null
+++ b/test/wpt/tests/websockets/unload-a-document/005.html
@@ -0,0 +1,21 @@
+<!doctype html>
+<title>WebSockets: navigating nested browsing context with a websocket in top-level</title>
+<meta name=timeout content=long>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=../constants.sub.js></script>
+<meta name="variant" content="">
+<meta name="variant" content="?wss">
+<meta name="variant" content="?wpt_flags=h2">
+<div id=log></div>
+<p>Test requires popup blocker disabled</p>
+<div id=log></div>
+<script>
+var t = async_test();
+t.step(function() {
+  var w = window.open("005-1.html" + location.search);
+  add_result_callback(function() {
+    w.close();
+  });
+});
+</script>
diff --git a/test/wpt/tests/wpt b/test/wpt/tests/wpt
new file mode 100644
index 00000000000..b0e415d8443
--- /dev/null
+++ b/test/wpt/tests/wpt
@@ -0,0 +1,10 @@
+#!/usr/bin/env python3
+
+if __name__ == "__main__":
+    import sys
+    if sys.version_info < (3, 6):
+        sys.stderr.write("wpt requires Python 3.6 or higher\n")
+        sys.exit(1)
+
+    from tools.wpt import wpt
+    wpt.main()
diff --git a/test/wpt/tests/wpt.py b/test/wpt/tests/wpt.py
new file mode 100644
index 00000000000..c38fe78e917
--- /dev/null
+++ b/test/wpt/tests/wpt.py
@@ -0,0 +1,7 @@
+# This file exists to allow `python wpt <command>` to work on Windows:
+# https://github.com/web-platform-tests/wpt/pull/6907 and
+# https://github.com/web-platform-tests/wpt/issues/23095
+import os
+abspath = os.path.abspath(__file__)
+os.chdir(os.path.dirname(abspath))
+exec(compile(open("wpt", "r").read(), "wpt", 'exec'))
diff --git a/test/wpt/tests/xhr/META.yml b/test/wpt/tests/xhr/META.yml
new file mode 100644
index 00000000000..c343ceac437
--- /dev/null
+++ b/test/wpt/tests/xhr/META.yml
@@ -0,0 +1,7 @@
+spec: https://xhr.spec.whatwg.org/
+suggested_reviewers:
+  - caitp
+  - Manishearth
+  - jdm
+  - annevk
+  - wisniewskit
diff --git a/test/wpt/tests/xhr/README.md b/test/wpt/tests/xhr/README.md
new file mode 100644
index 00000000000..8fbe615bf64
--- /dev/null
+++ b/test/wpt/tests/xhr/README.md
@@ -0,0 +1,7 @@
+Tests for the [XMLHttpRequest Standard](https://xhr.spec.whatwg.org/).
+
+More XMLHttpRequest-related tests can be found in
+
+* /cors
+* /fetch
+* /url (failure.html in particular)
diff --git a/test/wpt/tests/xhr/XMLHttpRequest-withCredentials.any.js b/test/wpt/tests/xhr/XMLHttpRequest-withCredentials.any.js
new file mode 100644
index 00000000000..27ffa70d5b9
--- /dev/null
+++ b/test/wpt/tests/xhr/XMLHttpRequest-withCredentials.any.js
@@ -0,0 +1,40 @@
+test(function() {
+  var client = new XMLHttpRequest()
+  assert_false(client.withCredentials, "withCredentials defaults to false")
+  client.withCredentials = true
+  assert_true(client.withCredentials, "is true after setting")
+}, "default value is false, set value is true")
+
+test(function() {
+  var client = new XMLHttpRequest()
+  client.open("GET", "resources/delay.py?ms=1000", true)
+  client.withCredentials = true
+  assert_true(client.withCredentials, "set in OPEN state")
+}, "can also be set in OPEN state")
+
+test(function() {
+  var client = new XMLHttpRequest()
+  client.open("GET", "resources/delay.py?ms=1000", false)
+  client.withCredentials = true
+  assert_true(client.withCredentials, "set in OPEN state")
+}, "setting on synchronous XHR")
+
+async_test(function() {
+  var client = new XMLHttpRequest()
+  client.open("GET", "resources/delay.py?ms=1000")
+  client.send()
+  assert_throws_dom("InvalidStateError", function() { client.withCredentials = true })
+  client.onreadystatechange = this.step_func(function() {
+    assert_throws_dom("InvalidStateError", function() { client.withCredentials = true })
+    if (client.readyState === 4) {
+      this.done()
+    }
+  })
+}, "setting withCredentials when not in UNSENT, OPENED state (asynchronous)")
+
+test(function() {
+  var client = new XMLHttpRequest()
+  client.open("GET", "resources/delay.py?ms=1000", false)
+  client.send();
+  assert_throws_dom("InvalidStateError", function() { client.withCredentials = true })
+}, "setting withCredentials when in DONE state (synchronous)")
diff --git a/test/wpt/tests/xhr/abort-after-receive.any.js b/test/wpt/tests/xhr/abort-after-receive.any.js
new file mode 100644
index 00000000000..d42d6d6815c
--- /dev/null
+++ b/test/wpt/tests/xhr/abort-after-receive.any.js
@@ -0,0 +1,30 @@
+// META: title=XMLHttpRequest: abort() after successful receive should not fire "abort" event
+
+      var test = async_test();
+
+      test.step(function() {
+        var client = new XMLHttpRequest();
+
+        client.onreadystatechange = test.step_func(function() {
+          if (client.readyState == 4) {
+            // abort should not cause the "abort" event to fire
+
+            client.abort();
+
+            assert_equals(client.readyState, 0);
+
+            test.step_timeout(function(){ // use a timeout to catch any implementation that might queue an abort event for later - just in case
+              test.done()
+            }, 200);
+          }
+        });
+
+        client.onabort = test.step_func(function () {
+            // this should not fire!
+
+            assert_unreached("abort() should not cause the abort event to fire");
+        });
+
+        client.open("GET", "resources/well-formed.xml", true);
+        client.send(null);
+      });
diff --git a/test/wpt/tests/xhr/abort-after-send.any.js b/test/wpt/tests/xhr/abort-after-send.any.js
new file mode 100644
index 00000000000..0ffd8877f87
--- /dev/null
+++ b/test/wpt/tests/xhr/abort-after-send.any.js
@@ -0,0 +1,29 @@
+// META: title=XMLHttpRequest: abort() after send()
+// META: script=resources/xmlhttprequest-event-order.js
+
+      var test = async_test()
+      test.step(function() {
+        var client = new XMLHttpRequest(),
+            control_flag = false;
+        prepare_xhr_for_event_order_test(client);
+        client.addEventListener("readystatechange", test.step_func(function() {
+          if(client.readyState == 4) {
+            control_flag = true
+            if (self.GLOBAL.isWindow()) {
+              assert_equals(client.responseXML, null)
+            }
+            assert_equals(client.responseText, "")
+            assert_equals(client.status, 0)
+            assert_equals(client.statusText, "")
+            assert_equals(client.getAllResponseHeaders(), "")
+            assert_equals(client.getResponseHeader('Content-Type'), null)
+          }
+        }))
+        client.open("GET", "resources/well-formed.xml", true)
+        client.send(null)
+        client.abort()
+        assert_true(control_flag)
+        assert_equals(client.readyState, 0)
+        assert_xhr_event_order_matches([1, "loadstart(0,0,false)", 4, "abort(0,0,false)", "loadend(0,0,false)"])
+        test.done()
+      })
diff --git a/test/wpt/tests/xhr/abort-after-stop.window.js b/test/wpt/tests/xhr/abort-after-stop.window.js
new file mode 100644
index 00000000000..a254648f419
--- /dev/null
+++ b/test/wpt/tests/xhr/abort-after-stop.window.js
@@ -0,0 +1,22 @@
+// META: title=XMLHttpRequest: abort event should fire when stop() method is used
+
+      var test = async_test();
+      window.onload = test.step_func(function() {
+        var client = new XMLHttpRequest();
+        var abortFired = false;
+        var sync = true;
+        client.onabort = test.step_func(function (e) {
+          assert_false(sync);
+          assert_equals(e.type, 'abort');
+          assert_equals(client.status, 0);
+          abortFired = true;
+        });
+        client.open("GET", "resources/delay.py?ms=3000", true);
+        client.send(null);
+        test.step_timeout(() => {
+          assert_equals(abortFired, true);
+          test.done();
+        }, 200);
+        window.stop();
+        sync = false;
+      });
diff --git a/test/wpt/tests/xhr/abort-after-timeout.any.js b/test/wpt/tests/xhr/abort-after-timeout.any.js
new file mode 100644
index 00000000000..fe8b749fcba
--- /dev/null
+++ b/test/wpt/tests/xhr/abort-after-timeout.any.js
@@ -0,0 +1,43 @@
+// META: title=XMLHttpRequest: abort() after a timeout should not fire "abort" event
+
+    var test = async_test();
+
+    test.step(function() {
+        // timeout is 100ms
+        // the download would otherwise take 1000ms
+        // we check after 300ms to make sure abort does not fire an "abort" event
+
+        var timeoutFired = false;
+
+        var client = new XMLHttpRequest();
+
+        assert_true('timeout' in client, 'xhr.timeout is not supported in this user agent');
+
+        client.timeout = 100;
+
+        test.step_timeout(() => {
+            assert_true(timeoutFired);
+
+            // abort should not cause the "abort" event to fire
+            client.abort();
+
+            test.step_timeout(() => { // use a timeout to catch any implementation that might queue an abort event for later - just in case
+              test.done()
+            }, 200);
+
+            assert_equals(client.readyState, 0);
+        }, 300);
+
+        client.ontimeout = function () {
+            timeoutFired = true;
+        };
+
+        client.onabort = test.step_func(function () {
+            // this should not fire!
+
+            assert_unreached("abort() should not cause the abort event to fire");
+        });
+
+        client.open("GET", "/common/blank.html?pipe=trickle(d1)", true);
+        client.send(null);
+    });
diff --git a/test/wpt/tests/xhr/abort-during-done.window.js b/test/wpt/tests/xhr/abort-during-done.window.js
new file mode 100644
index 00000000000..f885e59af12
--- /dev/null
+++ b/test/wpt/tests/xhr/abort-during-done.window.js
@@ -0,0 +1,78 @@
+// META: title=XMLHttpRequest: abort() during DONE
+
+      async_test(test => {
+        var client = new XMLHttpRequest(),
+            result = [],
+            expected = [1, 4] // open() -> 1, send() -> 4
+        client.onreadystatechange = test.step_func(function() {
+          result.push(client.readyState)
+        })
+        client.open("GET", "resources/well-formed.xml", false)
+        client.send(null)
+        assert_equals(client.readyState, 4)
+        assert_equals(client.status, 200)
+        assert_equals(client.statusText, "OK")
+        assert_equals(client.responseXML.documentElement.localName, "html")
+        client.abort()
+        assert_equals(client.readyState, 0)
+        assert_equals(client.status, 0)
+        assert_equals(client.statusText, "")
+        assert_equals(client.responseXML, null)
+        assert_equals(client.getAllResponseHeaders(), "")
+        assert_array_equals(result, expected)
+        test.done()
+      }, document.title + " (sync)")
+
+      async_test(test => {
+        var client = new XMLHttpRequest(),
+            result = [],
+            expected = [1, 4] // open() -> 1, send() -> 4
+        client.onreadystatechange = test.step_func(function() {
+          result.push(client.readyState);
+          if (client.readyState === 4) {
+            assert_equals(client.readyState, 4)
+            assert_equals(client.status, 200)
+            assert_equals(client.statusText, "OK")
+            assert_equals(client.responseXML.documentElement.localName, "html")
+            client.abort();
+            assert_equals(client.readyState, 0)
+            assert_equals(client.status, 0)
+            assert_equals(client.statusText, "")
+            assert_equals(client.responseXML, null)
+            assert_equals(client.getAllResponseHeaders(), "")
+            test.done()
+          }
+        })
+        client.open("GET", "resources/well-formed.xml", false)
+        client.send(null)
+        assert_equals(client.readyState, 0)
+        assert_equals(client.status, 200)
+        assert_equals(client.statusText, "OK")
+        assert_equals(client.responseXML.documentElement.localName, "html")
+      }, document.title + " (sync aborted in readystatechange)")
+
+      async_test(test => {
+        var client = new XMLHttpRequest(),
+            result = [],
+            expected = [1, 2, 3, 4]
+        client.onreadystatechange = test.step_func(function() {
+          result.push(client.readyState);
+          if (client.readyState === 4) {
+            assert_equals(client.readyState, 4)
+            assert_equals(client.status, 200)
+            assert_equals(client.responseXML.documentElement.localName, "html")
+            client.abort();
+            assert_equals(client.readyState, 0)
+            assert_equals(client.status, 0)
+            assert_equals(client.statusText, "")
+            assert_equals(client.responseXML, null)
+            assert_equals(client.getAllResponseHeaders(), "")
+            test.step_timeout(function() {
+              assert_array_equals(result, expected)
+              test.done();
+            }, 100); // wait a bit in case XHR timeout causes spurious event
+          }
+        })
+        client.open("GET", "resources/well-formed.xml")
+        client.send(null)
+      }, document.title + " (async)")
diff --git a/test/wpt/tests/xhr/abort-during-headers-received.window.js b/test/wpt/tests/xhr/abort-during-headers-received.window.js
new file mode 100644
index 00000000000..0e7140a85db
--- /dev/null
+++ b/test/wpt/tests/xhr/abort-during-headers-received.window.js
@@ -0,0 +1,41 @@
+// META: title=XMLHttpRequest: abort() during HEADERS_RECEIVED
+
+      async_test(test => {
+        var client = new XMLHttpRequest(),
+            result = [],
+            expected = [1, 2, 4]
+        client.onreadystatechange = test.step_func(function() {
+          result.push(client.readyState);
+          if (client.readyState === 2) {
+            assert_equals(client.status, 200)
+            assert_equals(client.statusText, "OK")
+            assert_equals(client.responseXML, null)
+            client.abort();
+            assert_equals(client.readyState, 0)
+            assert_equals(client.status, 0)
+            assert_equals(client.statusText, "")
+            assert_equals(client.responseXML, null)
+            assert_equals(client.getAllResponseHeaders(), "")
+          }
+          if (client.readyState === 4) {
+            assert_equals(client.readyState, 4)
+            assert_equals(client.status, 0)
+            assert_equals(client.statusText, "")
+            assert_equals(client.responseXML, null)
+            assert_equals(client.getAllResponseHeaders(), "")
+          }
+        })
+        client.onloadend = test.step_func(function() {
+          assert_equals(client.readyState, 4)
+          assert_equals(client.status, 0)
+          assert_equals(client.statusText, "")
+          assert_equals(client.responseXML, null)
+          assert_equals(client.getAllResponseHeaders(), "")
+          test.step_timeout(function() {
+            assert_array_equals(result, expected)
+            test.done();
+          }, 100); // wait a bit in case XHR timeout causes spurious event
+        })
+        client.open("GET", "resources/well-formed.xml")
+        client.send(null)
+      })
diff --git a/test/wpt/tests/xhr/abort-during-loading.window.js b/test/wpt/tests/xhr/abort-during-loading.window.js
new file mode 100644
index 00000000000..6fd217b2c5f
--- /dev/null
+++ b/test/wpt/tests/xhr/abort-during-loading.window.js
@@ -0,0 +1,41 @@
+// META: title=XMLHttpRequest: abort() during LOADING
+
+      async_test(test => {
+        var client = new XMLHttpRequest(),
+            result = [],
+            expected = [1, 2, 3, 4]
+        client.onreadystatechange = test.step_func(function() {
+          result.push(client.readyState);
+          if (client.readyState === 3) {
+            assert_equals(client.status, 200)
+            assert_equals(client.statusText, "OK")
+            assert_equals(client.responseXML, null)
+            client.abort();
+            assert_equals(client.readyState, 0)
+            assert_equals(client.status, 0)
+            assert_equals(client.statusText, "")
+            assert_equals(client.responseXML, null)
+            assert_equals(client.getAllResponseHeaders(), "")
+          }
+          if (client.readyState === 4) {
+            assert_equals(client.readyState, 4)
+            assert_equals(client.status, 0)
+            assert_equals(client.statusText, "")
+            assert_equals(client.responseXML, null)
+            assert_equals(client.getAllResponseHeaders(), "")
+          }
+        })
+        client.onloadend = test.step_func(function() {
+          assert_equals(client.readyState, 4)
+          assert_equals(client.status, 0)
+          assert_equals(client.statusText, "")
+          assert_equals(client.responseXML, null)
+          assert_equals(client.getAllResponseHeaders(), "")
+          test.step_timeout(function() {
+            assert_array_equals(result, expected)
+            test.done();
+          }, 100); // wait a bit in case XHR timeout causes spurious event
+        })
+        client.open("GET", "resources/well-formed.xml")
+        client.send(null)
+      })
diff --git a/test/wpt/tests/xhr/abort-during-open.any.js b/test/wpt/tests/xhr/abort-during-open.any.js
new file mode 100644
index 00000000000..42a1bce0ef2
--- /dev/null
+++ b/test/wpt/tests/xhr/abort-during-open.any.js
@@ -0,0 +1,18 @@
+var test = async_test("XMLHttpRequest: abort() during OPEN");
+test.step(function() {
+  var client = new XMLHttpRequest()
+  client.open("GET", "...")
+  client.onreadystatechange = function() {
+    test.step(function() {
+      assert_unreached()
+    })
+  }
+  assert_equals(client.readyState, 1, "before abort()")
+  assert_equals(client.status, 0)
+  assert_equals(client.statusText, "")
+  client.abort()
+  assert_equals(client.readyState, 1, "after abort()")
+  assert_equals(client.status, 0)
+  assert_equals(client.statusText, "")
+})
+test.done()
diff --git a/test/wpt/tests/xhr/abort-during-readystatechange.any.js b/test/wpt/tests/xhr/abort-during-readystatechange.any.js
new file mode 100644
index 00000000000..a036376c6c0
--- /dev/null
+++ b/test/wpt/tests/xhr/abort-during-readystatechange.any.js
@@ -0,0 +1,19 @@
+"use strict";
+setup({ single_test: true });
+
+const xhr = new XMLHttpRequest();
+
+// In jsdom's implementation, this would cause a crash, as after firing readystatechange for HEADERS_RECEIVED, it would
+// try to manipulate internal state. But that internal state got cleared during abort(). So jsdom needed to be modified
+// to check if that internal state had gone away as a result of firing readystatechange, and if so, bail out.
+
+xhr.addEventListener("readystatechange", () => {
+  if (xhr.readyState === xhr.HEADERS_RECEIVED) {
+    xhr.abort();
+  } else if (xhr.readyState === xhr.DONE) {
+    done();
+  }
+});
+
+xhr.open("GET", "/common/blank.html");
+xhr.send();
diff --git a/test/wpt/tests/xhr/abort-during-unsent.any.js b/test/wpt/tests/xhr/abort-during-unsent.any.js
new file mode 100644
index 00000000000..648ca055ae0
--- /dev/null
+++ b/test/wpt/tests/xhr/abort-during-unsent.any.js
@@ -0,0 +1,19 @@
+// META: title=XMLHttpRequest: abort() during UNSENT
+
+      var test = async_test()
+      test.step(function() {
+        var client = new XMLHttpRequest()
+        client.onreadystatechange = function() {
+          test.step(function() {
+            assert_unreached()
+          })
+        }
+        assert_equals(client.readyState, 0)
+        assert_equals(client.status, 0)
+        assert_equals(client.statusText, "")
+        client.abort()
+        assert_equals(client.readyState, 0)
+        assert_equals(client.status, 0)
+        assert_equals(client.statusText, "")
+      })
+      test.done()
diff --git a/test/wpt/tests/xhr/abort-during-upload.any.js b/test/wpt/tests/xhr/abort-during-upload.any.js
new file mode 100644
index 00000000000..fe4963da673
--- /dev/null
+++ b/test/wpt/tests/xhr/abort-during-upload.any.js
@@ -0,0 +1,17 @@
+// META: title=XMLHttpRequest: abort() while sending data
+// META: script=resources/xmlhttprequest-event-order.js
+
+      var test = async_test()
+      test.step(function() {
+        var client = new XMLHttpRequest()
+        prepare_xhr_for_event_order_test(client);
+        client.open("POST", "resources/delay.py?ms=1000")
+        client.addEventListener("loadend", function(e) {
+          test.step(function() {
+            assert_xhr_event_order_matches([1, "loadstart(0,0,false)", "upload.loadstart(0,9999,true)", 4, "upload.abort(0,0,false)", "upload.loadend(0,0,false)", "abort(0,0,false)", "loadend(0,0,false)"]);
+            test.done()
+          })
+        });
+        client.send((new Array(10000)).join('a'))
+        client.abort()
+      })
diff --git a/test/wpt/tests/xhr/abort-event-abort.any.js b/test/wpt/tests/xhr/abort-event-abort.any.js
new file mode 100644
index 00000000000..c730e7199c3
--- /dev/null
+++ b/test/wpt/tests/xhr/abort-event-abort.any.js
@@ -0,0 +1,32 @@
+// META: title=XMLHttpRequest: The abort() method: do not fire abort event in OPENED state when send() flag is unset.
+
+        var test = async_test()
+
+        test.step(function()
+        {
+            var xhr = new XMLHttpRequest()
+
+            xhr.onreadystatechange = function()
+            {
+                test.step(function()
+                {
+                    if (xhr.readyState == 1)
+                    {
+                        xhr.abort();
+                        assert_equals(xhr.readyState, 1, "abort() cannot change readyState when readyState is 1 and send() flag is unset")
+                    }
+                });
+            };
+
+            xhr.onabort = function(e)
+            {
+                test.step(function()
+                {
+                    assert_unreached('when abort() is called, state is OPENED with the send() flag being unset, must not fire abort event per spec')
+                });
+            };
+
+            xhr.open("GET", "./resources/content.py", true); // This should cause a readystatechange event that calls abort()
+            xhr.send() // should not throw since abort() was a no-op
+            test.done()
+        });
diff --git a/test/wpt/tests/xhr/abort-event-listeners.any.js b/test/wpt/tests/xhr/abort-event-listeners.any.js
new file mode 100644
index 00000000000..67bbae6e68d
--- /dev/null
+++ b/test/wpt/tests/xhr/abort-event-listeners.any.js
@@ -0,0 +1,13 @@
+// META: title=XMLHttpRequest: abort() should not reset event listeners
+
+      var test = async_test()
+      test.step(function() {
+        var client = new XMLHttpRequest(),
+            test = function() {}
+        client.onreadystatechange = test
+        client.open("GET", "resources/well-formed.xml")
+        client.send(null)
+        client.abort()
+        assert_equals(client.onreadystatechange, test)
+      })
+      test.done()
diff --git a/test/wpt/tests/xhr/abort-event-loadend.any.js b/test/wpt/tests/xhr/abort-event-loadend.any.js
new file mode 100644
index 00000000000..7c19c6d4f3f
--- /dev/null
+++ b/test/wpt/tests/xhr/abort-event-loadend.any.js
@@ -0,0 +1,30 @@
+// META: title=XMLHttpRequest: The abort() method: Fire a progress event named loadend
+
+        var test = async_test(function(test)
+        {
+            var xhr = new XMLHttpRequest();
+
+            xhr.onloadstart = function()
+            {
+                test.step(function()
+                {
+                    if (xhr.readyState == 1)
+                    {
+                        xhr.abort();
+                    }
+                });
+            };
+
+            xhr.onloadend = function(e)
+            {
+                test.step(function()
+                {
+                    assert_true(e instanceof ProgressEvent);
+                    assert_equals(e.type, "loadend");
+                    test.done();
+                });
+            };
+
+            xhr.open("GET", "resources/content.py", true);
+            xhr.send();
+        });
diff --git a/test/wpt/tests/xhr/abort-event-order.htm b/test/wpt/tests/xhr/abort-event-order.htm
new file mode 100644
index 00000000000..f05c20628c4
--- /dev/null
+++ b/test/wpt/tests/xhr/abort-event-order.htm
@@ -0,0 +1,52 @@
+<!DOCTYPE html>
+<html>
+<head>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-abort()-method" data-tested-assertations="following-sibling::ol/li[4]/ol/li[3] following-sibling::ol/li[4]/ol/li[5] following-sibling::ol/li[4]/ol/li[6] following-sibling::ol/li[4]/ol/li[7]/ol/li[3] following-sibling::ol/li[4]/ol/li[7]/ol/li[4] following-sibling::ol/li[5]" />
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <script src="resources/xmlhttprequest-event-order.js"></script>
+    <title>XMLHttpRequest: The abort() method: abort and loadend events</title>
+</head>
+
+<body>
+    <div id="log"></div>
+
+    <script type="text/javascript">
+        var test = async_test();
+
+        test.step(function()
+        {
+            var xhr = new XMLHttpRequest();
+            prepare_xhr_for_event_order_test(xhr);
+
+            xhr.addEventListener("loadstart", function() {
+                test.step(function()
+                {
+                    var readyState = xhr.readyState;
+                    if (readyState == 1)
+                    {
+                        xhr.abort();
+                        VerifyResult();
+                    } else {
+                        assert_unreached('Loadstart event should not fire in readyState '+readyState);
+                    }
+                });
+            });
+
+            function VerifyResult()
+            {
+                test.step(function()
+                {
+                    assert_xhr_event_order_matches([1, "loadstart(0,0,false)", 4, "upload.abort(0,0,false)", "upload.loadend(0,0,false)", "abort(0,0,false)", "loadend(0,0,false)"]);
+
+                    assert_equals(xhr.readyState, 0, 'state should be UNSENT');
+                    test.done();
+                });
+            };
+
+            xhr.open("POST", "./resources/content.py", true);
+            xhr.send("Test Message");
+        });
+    </script>
+</body>
+</html>
diff --git a/test/wpt/tests/xhr/abort-upload-event-abort.any.js b/test/wpt/tests/xhr/abort-upload-event-abort.any.js
new file mode 100644
index 00000000000..3c85a5554bd
--- /dev/null
+++ b/test/wpt/tests/xhr/abort-upload-event-abort.any.js
@@ -0,0 +1,31 @@
+        var test = async_test("XMLHttpRequest: The abort() method: Fire a progress event named abort on the XMLHttpRequestUpload object");
+
+        test.step(function()
+        {
+            var xhr = new XMLHttpRequest();
+
+            xhr.onloadstart = function()
+            {
+                test.step(function()
+                {
+                    if (xhr.readyState == 1)
+                    {
+                        xhr.abort();
+                    }
+                });
+            };
+
+            xhr.upload.onabort = function(e)
+            {
+                test.step(function()
+                {
+                    assert_true(e instanceof ProgressEvent);
+                    assert_equals(e.type, "abort");
+                    assert_equals(e.target, xhr.upload);
+                    test.done();
+                });
+            };
+
+            xhr.open("POST", "./resources/content.py", true);
+            xhr.send("Test Message");
+        });
diff --git a/test/wpt/tests/xhr/abort-upload-event-loadend.any.js b/test/wpt/tests/xhr/abort-upload-event-loadend.any.js
new file mode 100644
index 00000000000..91c5dc5c72e
--- /dev/null
+++ b/test/wpt/tests/xhr/abort-upload-event-loadend.any.js
@@ -0,0 +1,31 @@
+        var test = async_test("XMLHttpRequest: The abort() method: Fire a progress event named loadend on the XMLHttpRequestUpload object");
+
+        test.step(function()
+        {
+            var xhr = new XMLHttpRequest();
+
+            xhr.onloadstart = function()
+            {
+                test.step(function ()
+                {
+                    if (xhr.readyState == 1)
+                    {
+                        xhr.abort();
+                    }
+                });
+            };
+
+            xhr.upload.onloadend = function(e)
+            {
+                test.step(function()
+                {
+                    assert_true(e instanceof ProgressEvent);
+                    assert_equals(e.type, "loadend");
+                    assert_equals(e.target, xhr.upload);
+                    test.done();
+                });
+            };
+
+            xhr.open("POST", "./resources/content.py", true);
+            xhr.send("Test Message");
+        });
diff --git a/test/wpt/tests/xhr/access-control-and-redirects-async-same-origin.any.js b/test/wpt/tests/xhr/access-control-and-redirects-async-same-origin.any.js
new file mode 100644
index 00000000000..11d38fa451e
--- /dev/null
+++ b/test/wpt/tests/xhr/access-control-and-redirects-async-same-origin.any.js
@@ -0,0 +1,61 @@
+// META: title=Tests that asynchronous XMLHttpRequests handle redirects according to the CORS standard.
+// META: script=/common/get-host-info.sub.js
+
+    function runTest(test, path, credentials, expectSuccess) {
+      const xhr = new XMLHttpRequest();
+      xhr.withCredentials = credentials;
+      xhr.open("GET", "resources/redirect.py?location=" + get_host_info().HTTP_REMOTE_ORIGIN + path, true);
+
+      xhr.onload = test.step_func_done(function() {
+        assert_true(expectSuccess);
+        assert_equals(xhr.responseText, "PASS: Cross-domain access allowed.");
+      });
+      xhr.onerror = test.step_func_done(function() {
+        assert_false(expectSuccess);
+        assert_equals(xhr.status, 0);
+      });
+      xhr.send(null);
+    }
+
+    const withoutCredentials = false;
+    const withCredentials = true;
+    const succeeds = true;
+    const fails = false;
+
+    // Test simple same origin requests that receive cross origin redirects.
+
+    // The redirect response passes the access check.
+    async_test(t => {
+      runTest(t, "/xhr/resources/access-control-basic-allow-star.py",
+          withoutCredentials, succeeds)
+    }, "Request without credentials is redirected to a cross-origin response with Access-Control-Allow-Origin=* (with star)");
+
+    // The redirect response fails the access check because credentials were sent.
+    async_test(t => {
+      runTest(t, "/xhr/resources/access-control-basic-allow-star.py",
+          withCredentials, fails)
+    }, "Request with credentials is redirected to a cross-origin response with Access-Control-Allow-Origin=* (with star)");
+
+    // The redirect response passes the access check.
+    async_test(t => {
+      runTest(t, "/xhr/resources/access-control-basic-allow.py",
+          withoutCredentials, succeeds)
+    }, "Request without credentials is redirected to a cross-origin response with a specific Access-Control-Allow-Origin");
+
+    // The redirect response passes the access check.
+    async_test(t => {
+      runTest(t, "/xhr/resources/access-control-basic-allow.py",
+          withCredentials, succeeds)
+    }, "Request with credentials is redirected to a cross-origin response with a specific Access-Control-Allow-Origin");
+
+    // forbidding credentials. The redirect response passes the access check.
+    async_test(t => {
+      runTest(t, "/xhr/resources/access-control-basic-allow-no-credentials.py",
+          withoutCredentials, succeeds)
+    }, "Request without credentials is redirected to a cross-origin response with a specific Access-Control-Allow-Origin (no credentials)");
+
+    // forbidding credentials. The redirect response fails the access check.
+    async_test(t => {
+      runTest(t, "/xhr/resources/access-control-basic-allow-no-credentials.py",
+          withCredentials, fails)
+    }, "Request with credentials is redirected to a cross-origin response with a specific Access-Control-Allow-Origin (no credentials)");
diff --git a/test/wpt/tests/xhr/access-control-and-redirects-async.any.js b/test/wpt/tests/xhr/access-control-and-redirects-async.any.js
new file mode 100644
index 00000000000..c88b8821dd1
--- /dev/null
+++ b/test/wpt/tests/xhr/access-control-and-redirects-async.any.js
@@ -0,0 +1,79 @@
+// META: title=Tests that asynchronous XMLHttpRequests handle redirects according to the CORS standard.
+// META: script=/common/get-host-info.sub.js
+
+    function runTest(test, destination, parameters, customHeader, local, expectSuccess) {
+      const xhr = new XMLHttpRequest();
+      const url = (local ? get_host_info().HTTP_ORIGIN : get_host_info().HTTP_REMOTE_ORIGIN) +
+        "/xhr/resources/redirect-cors.py?location=" + destination + "&" +  parameters;
+
+      xhr.open("GET", url, true);
+
+      if (customHeader)
+        xhr.setRequestHeader("x-test", "test");
+
+      xhr.onload = test.step_func_done(function() {
+        assert_true(expectSuccess);
+        assert_true(xhr.responseText.startsWith("PASS"));
+      });
+      xhr.onerror = test.step_func_done(function() {
+        assert_false(expectSuccess);
+        assert_equals(xhr.status, 0);
+      });
+      xhr.send();
+    }
+
+    const withCustomHeader = true;
+    const withoutCustomHeader = false;
+    const local = true;
+    const remote = false;
+    const succeeds = true;
+    const fails = false;
+
+    // Test simple cross origin requests that receive redirects.
+
+    // The redirect response fails the access check because the redirect lacks a CORS header.
+    async_test(t => {
+      runTest(t, get_host_info().HTTP_REMOTE_ORIGIN +
+          "/xhr/resources/access-control-basic-allow-star.py", "",
+          withoutCustomHeader, remote, fails)
+    }, "Request is redirected without CORS headers to a response with Access-Control-Allow-Origin=*");
+
+    // The redirect response passes the access check.
+    async_test(t => {
+      runTest(t, get_host_info().HTTP_REMOTE_ORIGIN +
+          "/xhr/resources/access-control-basic-allow-star.py", "allow_origin=true",
+          withoutCustomHeader, remote, succeeds)
+    }, "Request is redirected to a response with Access-Control-Allow-Origin=*");
+
+    // The redirect response fails the access check because user info was sent.
+    async_test(t => {
+      runTest(t, get_host_info().HTTP_REMOTE_ORIGIN.replace("http://", "http://username:password@") +
+          "/xhr/resources/access-control-basic-allow-star.py", "allow_origin=true",
+          withoutCustomHeader, remote, fails)
+    }, "Request with user info is redirected to a response with Access-Control-Allow-Origin=*");
+
+    // The redirect response fails the access check because the URL scheme is unsupported.
+    async_test(t => {
+      runTest(t, "foo://bar.cgi", "allow_origin=true", withoutCustomHeader, remote, fails)
+    }, "Request is redirect to a bad URL");
+
+    // The preflighted redirect response fails the access check because of preflighting.
+    async_test(t => {
+      runTest(t, get_host_info().HTTP_REMOTE_ORIGIN +
+          "/xhr/resources/access-control-basic-allow-star.py",
+          "allow_origin=true&redirect_preflight=true", withCustomHeader, remote, fails)
+    }, "Preflighted request is redirected to a response with Access-Control-Allow-Origin=*");
+
+    // The preflighted redirect response fails the access check after successful preflighting.
+    async_test(t => {
+      runTest(t, get_host_info().HTTP_REMOTE_ORIGIN +
+          "/xhr/resources/access-control-basic-allow-star.py",
+          "allow_origin=true&allow_header=x-test&redirect_preflight=true",
+          withCustomHeader, remote, fails)
+    }, "Preflighted request is redirected to a response with Access-Control-Allow-Origin=* and header allowed");
+
+    // The same-origin redirect response passes the access check.
+    async_test(t => {
+      runTest(t, get_host_info().HTTP_ORIGIN + "/xhr/resources/pass.txt",
+          "", withCustomHeader, local, succeeds)
+    }, "Request is redirected to a same-origin resource file");
diff --git a/test/wpt/tests/xhr/access-control-and-redirects.any.js b/test/wpt/tests/xhr/access-control-and-redirects.any.js
new file mode 100644
index 00000000000..815d345c0f0
--- /dev/null
+++ b/test/wpt/tests/xhr/access-control-and-redirects.any.js
@@ -0,0 +1,50 @@
+// META: title=Tests that redirects between origins are allowed when access control is involved.
+// META: script=/common/get-host-info.sub.js
+
+    function runSync(test, url)
+    {
+      const xhr = new XMLHttpRequest();
+      xhr.open("GET", url, false);
+      xhr.send();
+      assert_equals(xhr.responseText, "PASS: Cross-domain access allowed.");
+      test.done();
+    }
+    function runAsync(test, url)
+    {
+      const xhr = new XMLHttpRequest();
+      xhr.open("GET", url, true);
+      xhr.onload = test.step_func_done(function() {
+        assert_equals(xhr.responseText, "PASS: Cross-domain access allowed.");
+      });
+      xhr.onerror = test.unreached_func("Network error");
+      xhr.send();
+      test.done();
+    }
+    test(t => {
+      runSync(t, "resources/redirect-cors.py?location=" + get_host_info().HTTP_REMOTE_ORIGIN +
+          "/xhr/resources/access-control-basic-allow.py")
+    }, "Local sync redirect to remote origin");
+    async_test(t => {
+      runAsync(t, "resources/redirect-cors.py?location=" + get_host_info().HTTP_REMOTE_ORIGIN +
+          "/xhr/resources/access-control-basic-allow.py")
+    }, "Local async redirect to remote origin");
+    test(t => {
+      runSync(t, get_host_info().HTTP_REMOTE_ORIGIN +
+          "/xhr/resources/redirect-cors.py?location=" + get_host_info().HTTP_ORIGIN +
+          "/xhr/resources/access-control-basic-allow.py&allow_origin=true")
+    }, "Remote sync redirect to local origin");
+    async_test(t => {
+      runAsync(t, get_host_info().HTTP_REMOTE_ORIGIN +
+          "/xhr/resources/redirect-cors.py?location=" + get_host_info().HTTP_ORIGIN +
+          "/xhr/resources/access-control-basic-allow.py&allow_origin=true")
+    }, "Remote async redirect to local origin");
+    test(t => {
+      runSync(t, get_host_info().HTTP_REMOTE_ORIGIN +
+          "/xhr/resources/redirect-cors.py?location=" + get_host_info().HTTP_REMOTE_ORIGIN +
+          "/xhr/resources/access-control-basic-allow.py&allow_origin=true")
+    }, "Remote sync redirect to same remote origin");
+    async_test(t => {
+      runAsync(t, get_host_info().HTTP_REMOTE_ORIGIN +
+          "/xhr/resources/redirect-cors.py?location=" + get_host_info().HTTP_REMOTE_ORIGIN +
+          "/xhr/resources/access-control-basic-allow.py&allow_origin=true")
+    }, "Remote async redirect to same remote origin");
diff --git a/test/wpt/tests/xhr/access-control-basic-allow-access-control-origin-header-data-url.htm b/test/wpt/tests/xhr/access-control-basic-allow-access-control-origin-header-data-url.htm
new file mode 100644
index 00000000000..0d66ad787af
--- /dev/null
+++ b/test/wpt/tests/xhr/access-control-basic-allow-access-control-origin-header-data-url.htm
@@ -0,0 +1,43 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>Tests that cross-origin access is granted to null-origin embedded iframe</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <script src="/common/get-host-info.sub.js"></script>
+  </head>
+  <body>
+    <script type="text/javascript">
+const url = get_host_info().HTTP_REMOTE_ORIGIN + "/xhr/resources/access-control-origin-header.py";
+async_test(function(test) {
+  window.addEventListener("message", test.step_func(function(evt) {
+    if (evt.data == "ready") {
+      document.getElementById("frame").contentWindow.postMessage(url, "*");
+    } else {
+      assert_equals(evt.data, "PASS: Cross-domain access allowed.\nHTTP_ORIGIN: null");
+      test.done();
+    }
+  }), false);
+}, "Access granted to null-origin iframe");
+    </script>
+    <iframe id="frame" src='data:text/html,
+    <script>
+(function() {
+  parent.postMessage("ready", "*");
+  window.addEventListener("message", function(evt) {
+    try {
+      const url = evt.data;
+      const xhr = new XMLHttpRequest;
+
+      xhr.open("GET", url, false);
+      xhr.send();
+
+      parent.postMessage(xhr.responseText, "*");
+    } catch(e) {
+      parent.postMessage(e.message, "*");
+    }
+  });
+})();
+    </script>'>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/access-control-basic-allow-access-control-origin-header.any.js b/test/wpt/tests/xhr/access-control-basic-allow-access-control-origin-header.any.js
new file mode 100644
index 00000000000..12b9cf21b28
--- /dev/null
+++ b/test/wpt/tests/xhr/access-control-basic-allow-access-control-origin-header.any.js
@@ -0,0 +1,13 @@
+// META: title=Access control test with origin header
+// META: script=/common/get-host-info.sub.js
+
+    async_test(function(test) {
+      const xhr = new XMLHttpRequest;
+
+      xhr.open("GET", get_host_info().HTTP_REMOTE_ORIGIN + "/xhr/resources/access-control-origin-header.py", false);
+      xhr.send();
+
+      assert_equals(xhr.responseText, "PASS: Cross-domain access allowed.\n" +
+          "HTTP_ORIGIN: " + get_host_info().HTTP_ORIGIN);
+      test.done();
+    }, "Access control test with origin header");
diff --git a/test/wpt/tests/xhr/access-control-basic-allow-async.any.js b/test/wpt/tests/xhr/access-control-basic-allow-async.any.js
new file mode 100644
index 00000000000..3f1ff3c2eb9
--- /dev/null
+++ b/test/wpt/tests/xhr/access-control-basic-allow-async.any.js
@@ -0,0 +1,19 @@
+// META: title=Testing a basic asynchronous CORS XHR request.
+// META: script=/common/get-host-info.sub.js
+
+    async_test(function(test) {
+      const xhr = new XMLHttpRequest;
+
+      xhr.onreadystatechange = test.step_func(function() {
+        if (xhr.readyState == xhr.DONE) {
+          assert_equals(xhr.responseText, "PASS: Cross-domain access allowed.");
+          test.done();
+        }
+      });
+
+      xhr.onerror = test.unreached_func("FAIL: Network error.");
+
+      xhr.open("GET", get_host_info().HTTP_REMOTE_ORIGIN +
+          "/xhr/resources/access-control-basic-allow.py", true);
+      xhr.send();
+    }, "Basic async cross-origin XHR request");
diff --git a/test/wpt/tests/xhr/access-control-basic-allow-non-cors-safelisted-method-async.any.js b/test/wpt/tests/xhr/access-control-basic-allow-non-cors-safelisted-method-async.any.js
new file mode 100644
index 00000000000..1e37f43f37f
--- /dev/null
+++ b/test/wpt/tests/xhr/access-control-basic-allow-non-cors-safelisted-method-async.any.js
@@ -0,0 +1,17 @@
+// META: title=Tests cross-origin async request with non-CORS-safelisted method
+// META: script=/common/get-host-info.sub.js
+
+    async_test((test) => {
+      const xhr = new XMLHttpRequest;
+
+      xhr.onload = test.step_func_done(() => {
+        assert_equals(xhr.responseText, "PASS: Cross-domain access allowed.\nPASS: PUT data received");
+      });
+
+      xhr.onerror = test.unreached_func("Unexpected error.");
+
+      xhr.open("PUT", get_host_info().HTTP_REMOTE_ORIGIN +
+          "/xhr/resources/access-control-basic-put-allow.py");
+      xhr.setRequestHeader("Content-Type", "text/plain; charset=UTF-8");
+      xhr.send("PASS: PUT data received");
+    }, "Allow async PUT request");
diff --git a/test/wpt/tests/xhr/access-control-basic-allow-non-cors-safelisted-method.any.js b/test/wpt/tests/xhr/access-control-basic-allow-non-cors-safelisted-method.any.js
new file mode 100644
index 00000000000..f238f0d3056
--- /dev/null
+++ b/test/wpt/tests/xhr/access-control-basic-allow-non-cors-safelisted-method.any.js
@@ -0,0 +1,14 @@
+// META: title=Tests cross-origin request with non-CORS-safelisted method
+// META: script=/common/get-host-info.sub.js
+
+    test(function() {
+      const xhr = new XMLHttpRequest;
+
+      xhr.open("PUT", get_host_info().HTTP_REMOTE_ORIGIN + "/xhr/resources/access-control-basic-put-allow.py", false);
+
+      xhr.setRequestHeader("Content-Type", "text/plain; charset=UTF-8");
+
+      xhr.send("PASS: PUT data received");
+
+      assert_equals(xhr.responseText, "PASS: Cross-domain access allowed.\nPASS: PUT data received");
+    }, "Allow PUT request");
diff --git a/test/wpt/tests/xhr/access-control-basic-allow-preflight-cache-invalidation-by-header.any.js b/test/wpt/tests/xhr/access-control-basic-allow-preflight-cache-invalidation-by-header.any.js
new file mode 100644
index 00000000000..c9673832ab3
--- /dev/null
+++ b/test/wpt/tests/xhr/access-control-basic-allow-preflight-cache-invalidation-by-header.any.js
@@ -0,0 +1,38 @@
+// META: title=Preflight cache should be invalidated in presence of custom header
+// META: script=/common/get-host-info.sub.js
+// META: script=/common/utils.js
+
+    const uuid = token();
+    const xhr = new XMLHttpRequest;
+
+    async_test(function(test) {
+      xhr.onerror = test.unreached_func("FAIL: Network error.");
+      xhr.onload = test.step_func(function() {
+        // Token reset.  We can start the test now.
+        assert_equals(xhr.responseText, "PASS");
+        firstRequest();
+      });
+
+      xhr.open("GET", get_host_info().HTTP_REMOTE_ORIGIN + "/xhr/resources/reset-token.py?token=" + uuid, true);
+      xhr.send();
+
+      function firstRequest() {
+        xhr.onload = test.step_func(function() {
+          assert_equals(xhr.responseText, "PASS: First PUT request.");
+          secondRequest();
+        });
+        xhr.open("PUT", get_host_info().HTTP_REMOTE_ORIGIN + "/xhr/resources/access-control-basic-preflight-cache-invalidation.py?token=" + uuid, true);
+        xhr.send();
+      }
+
+      function secondRequest() {
+        xhr.onload = test.step_func(function() {
+          assert_equals(xhr.responseText, "PASS: Second OPTIONS request was sent.");
+          test.done();
+        });
+        // Send a header not included in the inital cache.
+        xhr.open("PUT", get_host_info().HTTP_REMOTE_ORIGIN + "/xhr/resources/access-control-basic-preflight-cache-invalidation.py?token=" + uuid, true);
+        xhr.setRequestHeader("x-test", "headerValue");
+        xhr.send();
+      }
+    }, "Preflight cache should be invalidated in presence of custom header");
diff --git a/test/wpt/tests/xhr/access-control-basic-allow-preflight-cache-invalidation-by-method.any.js b/test/wpt/tests/xhr/access-control-basic-allow-preflight-cache-invalidation-by-method.any.js
new file mode 100644
index 00000000000..bb8a72c0da5
--- /dev/null
+++ b/test/wpt/tests/xhr/access-control-basic-allow-preflight-cache-invalidation-by-method.any.js
@@ -0,0 +1,37 @@
+// META: title=Preflight cache should be invalidated by changed method
+// META: script=/common/get-host-info.sub.js
+// META: script=/common/utils.js
+
+    const uuid = token();
+    const xhr = new XMLHttpRequest;
+
+    async_test(function(test) {
+      xhr.onerror = test.unreached_func("FAIL: Network error.");
+      xhr.onload = test.step_func(function() {
+        // Token reset.  We can start the test now.
+        assert_equals(xhr.responseText, "PASS");
+        firstRequest();
+      });
+
+      xhr.open("GET", get_host_info().HTTP_REMOTE_ORIGIN + "/xhr/resources/reset-token.py?token=" + uuid, true);
+      xhr.send();
+
+      function firstRequest() {
+        xhr.onload = test.step_func(function() {
+          assert_equals(xhr.responseText, "PASS: First PUT request.");
+          secondRequest();
+        });
+        xhr.open("PUT", get_host_info().HTTP_REMOTE_ORIGIN + "/xhr/resources/access-control-basic-preflight-cache-invalidation.py?token=" + uuid, true);
+        xhr.send();
+      }
+
+      function secondRequest() {
+        xhr.onload = test.step_func(function() {
+          assert_equals(xhr.responseText, "PASS: Second OPTIONS request was sent.");
+          test.done();
+        });
+        // Send a header not included in the inital cache.
+        xhr.open("XMETHOD", get_host_info().HTTP_REMOTE_ORIGIN + "/xhr/resources/access-control-basic-preflight-cache-invalidation.py?token=" + uuid, true);
+        xhr.send();
+      }
+    }, "Preflight cache should be invalidated by changed method");
diff --git a/test/wpt/tests/xhr/access-control-basic-allow-preflight-cache-timeout.any.js b/test/wpt/tests/xhr/access-control-basic-allow-preflight-cache-timeout.any.js
new file mode 100644
index 00000000000..00de0b3fc9d
--- /dev/null
+++ b/test/wpt/tests/xhr/access-control-basic-allow-preflight-cache-timeout.any.js
@@ -0,0 +1,37 @@
+// META: title=Preflight cache should be invalidated on timeout
+// META: timeout=long
+// META: script=/common/get-host-info.sub.js
+// META: script=/common/utils.js
+
+    const uuid = token();
+    let xhr = new XMLHttpRequest;
+
+    async_test(function(test) {
+      xhr.onerror = test.unreached_func("FAIL: Network error.");
+      xhr.onload = test.step_func(function() {
+        // Token reset.  We can start the test now.
+        assert_equals(xhr.responseText, "PASS");
+        firstRequest();
+      });
+
+      xhr.open("GET", get_host_info().HTTP_REMOTE_ORIGIN + "/xhr/resources/reset-token.py?token=" + uuid, true);
+      xhr.send();
+
+      function firstRequest() {
+        xhr.onload = test.step_func(function() {
+          assert_equals(xhr.responseText, "PASS: First PUT request.");
+          step_timeout(secondRequest, 3000); // 3 seconds
+        });
+        xhr.open("PUT", get_host_info().HTTP_REMOTE_ORIGIN + "/xhr/resources/access-control-basic-preflight-cache-timeout.py?token=" + uuid, true);
+        xhr.send();
+      }
+
+      function secondRequest() {
+        xhr.onload = test.step_func(function() {
+          assert_equals(xhr.responseText, "PASS: Second OPTIONS request was sent.");
+          test.done();
+        });
+        xhr.open("PUT", get_host_info().HTTP_REMOTE_ORIGIN + "/xhr/resources/access-control-basic-preflight-cache-timeout.py?token=" + uuid, true);
+        xhr.send();
+      }
+    }, "Preflight cache should be invalidated on timeout");
diff --git a/test/wpt/tests/xhr/access-control-basic-allow-preflight-cache.any.js b/test/wpt/tests/xhr/access-control-basic-allow-preflight-cache.any.js
new file mode 100644
index 00000000000..0bdf955ad57
--- /dev/null
+++ b/test/wpt/tests/xhr/access-control-basic-allow-preflight-cache.any.js
@@ -0,0 +1,35 @@
+// META: title=Preflight cache should allow second request without preflight OPTIONS request
+// META: script=/common/get-host-info.sub.js
+// META: script=/common/utils.js
+
+    const uuid = token();
+
+    async_test(function(test) {
+      const xhr = new XMLHttpRequest;
+      xhr.onerror = test.unreached_func("FAIL: Network error.");
+      xhr.onload = test.step_func(function() {
+        // Token reset.  We can start the test now.
+        assert_equals(xhr.responseText, "PASS");
+        firstRequest();
+      });
+
+      xhr.open("GET", get_host_info().HTTP_REMOTE_ORIGIN + "/xhr/resources/reset-token.py?token=" + uuid, true);
+      xhr.send();
+
+      function firstRequest() {
+        xhr.onload = test.step_func(function() {
+          assert_equals(xhr.responseText, "PASS: First PUT request.");
+          secondRequest();
+        });
+        xhr.open("PUT", get_host_info().HTTP_REMOTE_ORIGIN + "/xhr/resources/access-control-basic-preflight-cache.py?token=" + uuid, true);
+        xhr.send();
+      }
+
+      function secondRequest() {
+        xhr.onload = test.step_func_done(function() {
+          assert_equals(xhr.responseText, "PASS: Second PUT request. Preflight worked.");
+        });
+        xhr.open("PUT", get_host_info().HTTP_REMOTE_ORIGIN + "/xhr/resources/access-control-basic-preflight-cache.py?token=" + uuid, true);
+        xhr.send();
+      }
+    }, "Preflight cache should allow second request");
diff --git a/test/wpt/tests/xhr/access-control-basic-allow-star.any.js b/test/wpt/tests/xhr/access-control-basic-allow-star.any.js
new file mode 100644
index 00000000000..c7ab3fe2c13
--- /dev/null
+++ b/test/wpt/tests/xhr/access-control-basic-allow-star.any.js
@@ -0,0 +1,12 @@
+// META: title=Tests "*" setting for Access-Control-Allow-Origin header
+// META: script=/common/get-host-info.sub.js
+
+    const xhr = new XMLHttpRequest;
+
+    test(function(test) {
+      xhr.open("GET", get_host_info().HTTP_REMOTE_ORIGIN + "/xhr/resources/access-control-basic-allow-star.py", false);
+
+      xhr.send();
+
+      assert_equals(xhr.responseText, "PASS: Cross-domain access allowed.");
+    }, "Allow star");
diff --git a/test/wpt/tests/xhr/access-control-basic-allow.any.js b/test/wpt/tests/xhr/access-control-basic-allow.any.js
new file mode 100644
index 00000000000..c89538350a1
--- /dev/null
+++ b/test/wpt/tests/xhr/access-control-basic-allow.any.js
@@ -0,0 +1,12 @@
+// META: title=Tests CORS with Access-Control-Allow-Origin header
+// META: script=/common/get-host-info.sub.js
+
+    test(function() {
+      const xhr = new XMLHttpRequest;
+
+      xhr.open("GET", get_host_info().HTTP_REMOTE_ORIGIN + "/xhr/resources/access-control-basic-allow.py", false);
+
+      xhr.send();
+
+      assert_equals(xhr.responseText, "PASS: Cross-domain access allowed.");
+    }, "Allow basic");
diff --git a/test/wpt/tests/xhr/access-control-basic-cors-safelisted-request-headers.htm b/test/wpt/tests/xhr/access-control-basic-cors-safelisted-request-headers.htm
new file mode 100644
index 00000000000..56870493b4e
--- /dev/null
+++ b/test/wpt/tests/xhr/access-control-basic-cors-safelisted-request-headers.htm
@@ -0,0 +1,31 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>Tests that CORS-safelisted request headers are permitted in cross-origin request</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <script src="/common/get-host-info.sub.js"></script>
+  </head>
+  <body>
+    <script type="text/javascript">
+    test(function() {
+      const xhr = new XMLHttpRequest;
+
+      xhr.open("POST", get_host_info().HTTP_REMOTE_ORIGIN + "/xhr/resources/access-control-basic-cors-safelisted-request-headers.py", false);
+
+      xhr.setRequestHeader("Accept", "*");
+      xhr.setRequestHeader("Accept-Language", "ru");
+      xhr.setRequestHeader("Content-Language", "ru");
+      xhr.setRequestHeader("Content-Type", "text/plain");
+
+      xhr.send();
+
+      assert_equals(xhr.responseText,
+          "Accept: *\n" +
+          "Accept-Language: ru\n" +
+          "Content-Language: ru\n" +
+          "Content-Type: text/plain\n");
+    }, "Request with CORS-safelisted headers");
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/access-control-basic-cors-safelisted-response-headers.htm b/test/wpt/tests/xhr/access-control-basic-cors-safelisted-response-headers.htm
new file mode 100644
index 00000000000..fb58957f4b8
--- /dev/null
+++ b/test/wpt/tests/xhr/access-control-basic-cors-safelisted-response-headers.htm
@@ -0,0 +1,32 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>Tests that CORS-safelisted response headers are permitted in cross-origin request</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <script src="/common/get-host-info.sub.js"></script>
+  </head>
+  <body>
+    <script type="text/javascript">
+    test(function() {
+      const xhr = new XMLHttpRequest;
+
+      xhr.open("GET", get_host_info().HTTP_REMOTE_ORIGIN +
+          "/xhr/resources/access-control-basic-cors-safelisted-response-headers.py", false);
+      xhr.send();
+
+      assert_not_equals(xhr.getResponseHeader("cache-control"), null);
+      assert_not_equals(xhr.getResponseHeader("content-language"), null);
+      assert_not_equals(xhr.getResponseHeader("content-type"), null);
+      assert_not_equals(xhr.getResponseHeader("content-length"), null);
+      assert_not_equals(xhr.getResponseHeader("expires"), null);
+      assert_not_equals(xhr.getResponseHeader("last-modified"), null);
+      assert_not_equals(xhr.getResponseHeader("pragma"), null);
+      assert_equals(xhr.getResponseHeader("x-webkit"), null);
+
+      assert_not_equals(xhr.getAllResponseHeaders().match("en"), null);
+      assert_equals(xhr.getAllResponseHeaders().match("foobar"), null);
+    }, "Response with CORS-safelisted headers");
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/access-control-basic-denied.htm b/test/wpt/tests/xhr/access-control-basic-denied.htm
new file mode 100644
index 00000000000..970e09d0f57
--- /dev/null
+++ b/test/wpt/tests/xhr/access-control-basic-denied.htm
@@ -0,0 +1,30 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>Tests CORS denying resource without Access-Control-Allow-Origin header</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <script src="/common/get-host-info.sub.js"></script>
+  </head>
+  <body>
+    <script type="text/javascript">
+    const path = "/xhr/resources/access-control-basic-denied.py";
+
+    test(function() {
+      const xhr = new XMLHttpRequest;
+
+      xhr.open("GET", get_host_info().HTTP_ORIGIN + path, false);
+      xhr.send();
+      assert_equals(xhr.status, 200);
+    }, "Same-origin request accepted");
+
+    test(function() {
+      const xhr = new XMLHttpRequest;
+
+      xhr.open("GET", get_host_info().HTTP_REMOTE_ORIGIN + path, false);
+      assert_throws_dom("NetworkError", () => xhr.send());
+      assert_equals(xhr.status, 0);
+    }, "Cross-origin request denied");
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/access-control-basic-get-fail-non-simple.htm b/test/wpt/tests/xhr/access-control-basic-get-fail-non-simple.htm
new file mode 100644
index 00000000000..97370bd6502
--- /dev/null
+++ b/test/wpt/tests/xhr/access-control-basic-get-fail-non-simple.htm
@@ -0,0 +1,26 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>Tests CORS denying preflighted request to resource without CORS headers for OPTIONS</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <script src="/common/get-host-info.sub.js"></script>
+  </head>
+  <body>
+    <script type="text/javascript">
+    test(function() {
+      const xhr = new XMLHttpRequest;
+
+      xhr.open("GET", get_host_info().HTTP_REMOTE_ORIGIN +
+          "/xhr/resources/access-control-basic-options-not-supported.py", false);
+
+      // Non-CORS-safelisted header
+      xhr.setRequestHeader("x-test", "foobar");
+
+      // This fails because the server-side script is not prepared for an OPTIONS request
+      assert_throws_dom("NetworkError", () => xhr.send());
+      assert_equals(xhr.status, 0);
+    }, "Preflighted cross-origin request denied");
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/access-control-basic-non-cors-safelisted-content-type.htm b/test/wpt/tests/xhr/access-control-basic-non-cors-safelisted-content-type.htm
new file mode 100644
index 00000000000..0e0e971fd4b
--- /dev/null
+++ b/test/wpt/tests/xhr/access-control-basic-non-cors-safelisted-content-type.htm
@@ -0,0 +1,30 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>Tests cross-origin request with non-CORS-safelisted content type</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <script src="/common/get-host-info.sub.js"></script>
+  </head>
+  <body>
+    <script type="text/javascript">
+    test(() => {
+      const xhr = new XMLHttpRequest;
+
+      xhr.open("PUT", get_host_info().HTTP_REMOTE_ORIGIN +
+          "/xhr/resources/access-control-basic-put-allow.py", false);
+      xhr.setRequestHeader("Content-Type", "text/plain");
+      xhr.send("PASS: PUT data received");
+
+      assert_equals(xhr.responseText, "PASS: Cross-domain access allowed.\nPASS: PUT data received");
+
+      xhr.open("PUT", get_host_info().HTTP_REMOTE_ORIGIN +
+          "/xhr/resources/access-control-basic-put-allow.py", false);
+      xhr.setRequestHeader("Content-Type", "application/xml");
+
+      assert_throws_dom("NetworkError", () => xhr.send("FAIL: PUT data received"));
+      assert_equals(xhr.status, 0, "Cross-domain access was denied in 'send'.");
+    }, "Deny cross-origin request with non-CORS-safelisted content type");
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/access-control-basic-post-success-no-content-type.htm b/test/wpt/tests/xhr/access-control-basic-post-success-no-content-type.htm
new file mode 100644
index 00000000000..7e7a7d3a3e8
--- /dev/null
+++ b/test/wpt/tests/xhr/access-control-basic-post-success-no-content-type.htm
@@ -0,0 +1,26 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>Tests that POST requests with text content and no content-type set explicitly don't generate a preflight request.</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <script src="/common/get-host-info.sub.js"></script>
+  </head>
+  <body>
+    <script type="text/javascript">
+    async_test(function(test) {
+      const xhr = new XMLHttpRequest;
+
+      xhr.open("POST", get_host_info().HTTP_REMOTE_ORIGIN + "/xhr/resources/access-control-basic-options-not-supported.py");
+
+      xhr.onerror = test.unreached_func("Network error.");
+
+      xhr.onload = test.step_func_done(function() {
+        assert_equals(xhr.status, 200);
+      });
+
+      xhr.send("Test");
+    }, "POST request with text content and no Content-Type header");
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/access-control-basic-post-with-non-cors-safelisted-content-type.htm b/test/wpt/tests/xhr/access-control-basic-post-with-non-cors-safelisted-content-type.htm
new file mode 100644
index 00000000000..f63e6bc924e
--- /dev/null
+++ b/test/wpt/tests/xhr/access-control-basic-post-with-non-cors-safelisted-content-type.htm
@@ -0,0 +1,37 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>Non-CORS-safelisted value in the Content-Type header results in a request preflight</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <script src="/common/get-host-info.sub.js"></script>
+  </head>
+  <body>
+    <script type="text/javascript">
+    test(function() {
+      const xhr = new XMLHttpRequest;
+
+      xhr.open("POST", get_host_info().HTTP_ORIGIN +
+          "/xhr/resources/access-control-basic-options-not-supported.py", false);
+
+      xhr.setRequestHeader("Content-Type", "application/xml");
+
+      xhr.send();
+
+      assert_equals(xhr.status, 200, "Same-origin access doesn't issue preflight; not denied.");
+    }, "Same-origin request with non-safelisted content type succeeds");
+
+    test(function() {
+      const xhr = new XMLHttpRequest;
+
+      xhr.open("POST", get_host_info().HTTP_REMOTE_ORIGIN +
+          "/xhr/resources/access-control-basic-options-not-supported.py", false);
+
+      xhr.setRequestHeader("Content-Type", "application/xml");
+
+      assert_throws_dom("NetworkError", () => xhr.send());
+      assert_equals(xhr.status, 0, "Cross-domain access was denied in 'send'.");
+    }, "CORS request with non-safelisted content type sends preflight and fails");
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/access-control-basic-preflight-denied.htm b/test/wpt/tests/xhr/access-control-basic-preflight-denied.htm
new file mode 100644
index 00000000000..6475186a068
--- /dev/null
+++ b/test/wpt/tests/xhr/access-control-basic-preflight-denied.htm
@@ -0,0 +1,31 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>Tests async XHR preflight denial due to lack of CORS headers</title>
+    <!--The original test addressed a more specific issue involving caching,
+        but that issue has since been resolved.
+        We maintain this test as a basic test of invalid preflight denial.
+        Please refer to the comment in the following link for more information:
+        https://chromium-review.googlesource.com/c/chromium/src/+/630338#message-0280542b95c9b0f82b121dc373320c04fcaece31
+    -->
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <script src="/common/get-host-info.sub.js"></script>
+  </head>
+  <body>
+    <script type="text/javascript">
+    async_test((test) => {
+      const xhr = new XMLHttpRequest;
+      xhr.onerror = test.step_func_done(() => {
+        assert_equals(xhr.status, 0);
+      });
+
+      xhr.onload = test.unreached_func("Request succeeded unexpectedly");
+
+      xhr.open("FOO", get_host_info().HTTP_REMOTE_ORIGIN +
+          "/xhr/resources/access-control-basic-denied.py");
+      xhr.send();
+    });
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/access-control-expose-headers-on-redirect.html b/test/wpt/tests/xhr/access-control-expose-headers-on-redirect.html
new file mode 100644
index 00000000000..f06ec0c93a6
--- /dev/null
+++ b/test/wpt/tests/xhr/access-control-expose-headers-on-redirect.html
@@ -0,0 +1,33 @@
+<!DOCTYPE html>
+<html>
+<head>
+<title>XHR should respect access-control-expose-headers header on redirect</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/common/get-host-info.sub.js"></script>
+</head>
+<body>
+<script type="text/javascript">
+async_test((test) => {
+  const xhr = new XMLHttpRequest;
+
+  xhr.onerror = test.unreached_func("Unexpected error.");
+
+  xhr.onload = test.step_func_done(() => {
+    assert_equals(xhr.status, 200);
+    assert_equals(xhr.getResponseHeader('foo'), 'bar');
+    assert_equals(xhr.getResponseHeader('hoge'), null);
+  });
+
+  const destination = get_host_info().HTTP_REMOTE_ORIGIN +
+    '/common/blank.html?pipe=header(access-control-allow-origin,*)|' +
+    'header(access-control-expose-headers,foo)|' +
+    'header(foo,bar)|header(hoge,fuga)';
+  const url =
+    'resources/redirect.py?location=' + encodeURIComponent(destination);
+  xhr.open('GET', url);
+  xhr.send();
+});
+</script>
+</body>
+</html>
diff --git a/test/wpt/tests/xhr/access-control-preflight-async-header-denied.htm b/test/wpt/tests/xhr/access-control-preflight-async-header-denied.htm
new file mode 100644
index 00000000000..a00cc588981
--- /dev/null
+++ b/test/wpt/tests/xhr/access-control-preflight-async-header-denied.htm
@@ -0,0 +1,39 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>Async request denied at preflight because of non-CORS-safelisted header</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <script src="/common/get-host-info.sub.js"></script>
+    <script src="/common/utils.js"></script>
+  </head>
+  <body>
+    <script type="text/javascript">
+    const uuid = token();
+    const url = get_host_info().HTTP_REMOTE_ORIGIN +
+          "/xhr/resources/access-control-preflight-denied.py?token=" + uuid;
+
+    async_test((test) => {
+      let xhr = new XMLHttpRequest;
+      xhr.open("GET", url + "&command=reset", false);
+      xhr.send();
+
+      xhr = new XMLHttpRequest;
+      xhr.open("GET", url + "&command=header", true);
+      xhr.setRequestHeader("x-test", "foo");
+
+      xhr.onload = test.unreached_func(
+          "Cross-domain access with custom header allowed without throwing exception");
+
+      xhr.onerror = test.step_func_done(() => {
+        xhr = new XMLHttpRequest;
+        xhr.open("GET", url + "&command=complete", false);
+        xhr.send();
+        assert_equals(xhr.responseText, "Request successfully blocked.");
+      });
+
+      xhr.send();
+    }, "Async request denied at preflight");
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/access-control-preflight-async-method-denied.htm b/test/wpt/tests/xhr/access-control-preflight-async-method-denied.htm
new file mode 100644
index 00000000000..a0425a4bb16
--- /dev/null
+++ b/test/wpt/tests/xhr/access-control-preflight-async-method-denied.htm
@@ -0,0 +1,38 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>Async request denied at preflight because of non-CORS-safelisted method</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <script src="/common/get-host-info.sub.js"></script>
+    <script src="/common/utils.js"></script>
+  </head>
+  <body>
+    <script type="text/javascript">
+    const uuid = token();
+    const url = get_host_info().HTTP_REMOTE_ORIGIN +
+          "/xhr/resources/access-control-preflight-denied.py?token=" + uuid;
+
+    async_test((test) => {
+      let xhr = new XMLHttpRequest;
+      xhr.open("GET", url + "&command=reset", false);
+      xhr.send();
+
+      xhr = new XMLHttpRequest;
+      xhr.open("DELETE", url + "&command=method", true);
+
+      xhr.onload = test.unreached_func(
+          "Cross-domain access with non-CORS-safelisted method allowed without throwing exception");
+
+      xhr.onerror = test.step_func_done(() => {
+        xhr = new XMLHttpRequest;
+        xhr.open("GET", url + "&command=complete", false);
+        xhr.send();
+        assert_equals(xhr.responseText, "Request successfully blocked.");
+      });
+
+      xhr.send();
+    }, "Async request denied at preflight");
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/access-control-preflight-async-not-supported.htm b/test/wpt/tests/xhr/access-control-preflight-async-not-supported.htm
new file mode 100644
index 00000000000..a4dc06d5515
--- /dev/null
+++ b/test/wpt/tests/xhr/access-control-preflight-async-not-supported.htm
@@ -0,0 +1,37 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>Async PUT request denied at preflight</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <script src="/common/get-host-info.sub.js"></script>
+    <script src="/common/utils.js"></script>
+  </head>
+  <body>
+    <script type="text/javascript">
+const uuid = token();
+const url = get_host_info().HTTP_REMOTE_ORIGIN +
+      "/xhr/resources/access-control-preflight-denied.py?token=" + uuid;
+
+async_test((test) => {
+  let xhr = new XMLHttpRequest;
+  xhr.open("GET", url + "&command=reset", false);
+  xhr.send();
+
+  xhr = new XMLHttpRequest;
+  xhr.open("PUT", url, true);
+
+  xhr.onload = test.unreached_func("Cross-domain access allowed unexpectedly.");
+
+  xhr.onerror = test.step_func_done(() => {
+    xhr = new XMLHttpRequest;
+    xhr.open("GET", url + "&command=complete", false);
+    xhr.send();
+    assert_equals(xhr.responseText, "Request successfully blocked.");
+  });
+
+  xhr.send();
+});
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/access-control-preflight-credential-async.htm b/test/wpt/tests/xhr/access-control-preflight-credential-async.htm
new file mode 100644
index 00000000000..ad7117fdf98
--- /dev/null
+++ b/test/wpt/tests/xhr/access-control-preflight-credential-async.htm
@@ -0,0 +1,29 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>Tests proper handling of cross-origin async request with credentials</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <script src="/common/get-host-info.sub.js"></script>
+  </head>
+  <body>
+    <script type="text/javascript">
+    async_test((test) => {
+      const xhr = new XMLHttpRequest;
+
+      xhr.open("PUT", get_host_info().HTTP_REMOTE_ORIGIN +
+          "/xhr/resources/access-control-auth-basic.py?uid=fooUser",
+          true, "fooUser", "barPass");
+      xhr.withCredentials = true;
+
+      xhr.onerror = test.unreached_func("Unexpected error.");
+
+      xhr.onload = test.step_func_done(() => {
+        assert_equals(xhr.status, 401, "Request raises HTTP 401: Unauthorized error.");
+      });
+
+      xhr.send();
+    }, "CORS async request with URL credentials");
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/access-control-preflight-credential-sync.htm b/test/wpt/tests/xhr/access-control-preflight-credential-sync.htm
new file mode 100644
index 00000000000..3844d023d9f
--- /dev/null
+++ b/test/wpt/tests/xhr/access-control-preflight-credential-sync.htm
@@ -0,0 +1,24 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>Tests proper handling of cross-origin sync request with credentials</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <script src="/common/get-host-info.sub.js"></script>
+  </head>
+  <body>
+    <script type="text/javascript">
+    test(() => {
+      const xhr = new XMLHttpRequest;
+
+      xhr.open("PUT", get_host_info().HTTP_REMOTE_ORIGIN + "/xhr/resources/access-control-auth-basic.py?uid=fooUser", false, "fooUser", "barPass");
+
+      xhr.withCredentials = true;
+
+      xhr.send();
+
+      assert_equals(xhr.status, 401, "Request raises HTTP 401: Unauthorized error.");
+    }, "CORS sync request with URL credentials");
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/access-control-preflight-headers-async.htm b/test/wpt/tests/xhr/access-control-preflight-headers-async.htm
new file mode 100644
index 00000000000..ffea72ac3b2
--- /dev/null
+++ b/test/wpt/tests/xhr/access-control-preflight-headers-async.htm
@@ -0,0 +1,35 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>Test that async CORS requests with custom headers are sent with OPTIONS preflight</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <script src="/common/get-host-info.sub.js"></script>
+    <script src="/common/utils.js"></script>
+  </head>
+  <body>
+    <script type="text/javascript">
+async_test((test) => {
+  let xhr = new XMLHttpRequest;
+  const uuid = token();
+
+  xhr.open("GET", get_host_info().HTTP_REMOTE_ORIGIN +
+      "/xhr/resources/reset-token.py?token=" + uuid, false);
+  xhr.send();
+
+  xhr = new XMLHttpRequest;
+  xhr.open("GET", get_host_info().HTTP_REMOTE_ORIGIN +
+      "/xhr/resources/no-custom-header-on-preflight.py?token=" + uuid);
+  xhr.setRequestHeader("x-test", "foobar");
+
+  xhr.onerror = test.unreached_func("Unexpected error");
+
+  xhr.onload = test.step_func_done(() => {
+    assert_equals(xhr.responseText, "PASS");
+  });
+
+  xhr.send();
+}, "Preflighted async request with custom header");
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/access-control-preflight-headers-sync.htm b/test/wpt/tests/xhr/access-control-preflight-headers-sync.htm
new file mode 100644
index 00000000000..2ae9fe80022
--- /dev/null
+++ b/test/wpt/tests/xhr/access-control-preflight-headers-sync.htm
@@ -0,0 +1,29 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>Test that sync CORS requests with custom headers are not sent with OPTIONS preflight</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <script src="/common/get-host-info.sub.js"></script>
+    <script src="/common/utils.js"></script>
+  </head>
+  <body>
+    <script type="text/javascript">
+    test(function() {
+      let xhr = new XMLHttpRequest;
+      const uuid = token();
+
+      xhr.open("GET", get_host_info().HTTP_REMOTE_ORIGIN +
+          "/xhr/resources/reset-token.py?token=" + uuid, false);
+      xhr.send();
+
+      xhr = new XMLHttpRequest;
+      xhr.open("GET", get_host_info().HTTP_REMOTE_ORIGIN +
+          "/xhr/resources/no-custom-header-on-preflight.py?token=" + uuid, false);
+      xhr.setRequestHeader("x-test", "foobar");
+      xhr.send();
+      assert_equals(xhr.responseText, "PASS");
+    }, "Preflighted sync request with custom header");
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/access-control-preflight-request-allow-headers-returns-star.any.js b/test/wpt/tests/xhr/access-control-preflight-request-allow-headers-returns-star.any.js
new file mode 100644
index 00000000000..567dd25e75a
--- /dev/null
+++ b/test/wpt/tests/xhr/access-control-preflight-request-allow-headers-returns-star.any.js
@@ -0,0 +1,26 @@
+// META: title=Access-Control-Allow-Headers supports *
+// META: script=/common/get-host-info.sub.js
+"use strict";
+
+async_test(t => {
+  const xhr = new XMLHttpRequest();
+
+  xhr.open("GET", corsURL("resources/access-control-preflight-request-allow-headers-returns-star.py"));
+
+  xhr.setRequestHeader("X-Test", "foobar");
+
+  xhr.onerror = t.unreached_func("Error occurred.");
+
+  xhr.onload = t.step_func_done(() => {
+    assert_equals(xhr.status, 200);
+    assert_equals(xhr.responseText, "PASS");
+  });
+
+  xhr.send();
+});
+
+function corsURL(path) {
+  const url = new URL(path, location.href);
+  url.hostname = get_host_info().REMOTE_HOST;
+  return url.href;
+}
diff --git a/test/wpt/tests/xhr/access-control-preflight-request-header-lowercase.htm b/test/wpt/tests/xhr/access-control-preflight-request-header-lowercase.htm
new file mode 100644
index 00000000000..7dc4608f57e
--- /dev/null
+++ b/test/wpt/tests/xhr/access-control-preflight-request-header-lowercase.htm
@@ -0,0 +1,29 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>Access-Control-Request-Headers values should be lowercase</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <script src="/common/get-host-info.sub.js"></script>
+  </head>
+  <body>
+    <script type="text/javascript">
+    async_test(function(test) {
+      const xhr = new XMLHttpRequest;
+
+      xhr.open("GET", get_host_info().HTTP_REMOTE_ORIGIN + "/xhr/resources/access-control-preflight-request-header-lowercase.py");
+
+      xhr.setRequestHeader("X-Test", "foobar");
+
+      xhr.onerror = test.unreached_func("Error occurred.");
+
+      xhr.onload = test.step_func_done(function() {
+        assert_equals(xhr.status, 200);
+        assert_equals(xhr.responseText, "PASS");
+      });
+
+      xhr.send();
+    }, "Request with uppercase header set");
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/access-control-preflight-request-header-returns-origin.any.js b/test/wpt/tests/xhr/access-control-preflight-request-header-returns-origin.any.js
new file mode 100644
index 00000000000..2b68a6fe0df
--- /dev/null
+++ b/test/wpt/tests/xhr/access-control-preflight-request-header-returns-origin.any.js
@@ -0,0 +1,26 @@
+// META: title=Access-Control-Request-Origin accept different origin between preflight and actual request
+// META: script=/common/get-host-info.sub.js
+"use strict";
+
+async_test(t => {
+  const xhr = new XMLHttpRequest();
+
+  xhr.open("GET", corsURL("resources/access-control-preflight-request-header-returns-origin.py"));
+
+  xhr.setRequestHeader("X-Test", "foobar");
+
+  xhr.onerror = t.unreached_func("Error occurred.");
+
+  xhr.onload = t.step_func_done(() => {
+    assert_equals(xhr.status, 200);
+    assert_equals(xhr.responseText, "PASS");
+  });
+
+  xhr.send();
+});
+
+function corsURL(path) {
+  const url = new URL(path, location.href);
+  url.hostname = get_host_info().REMOTE_HOST;
+  return url.href;
+}
diff --git a/test/wpt/tests/xhr/access-control-preflight-request-header-sorted.htm b/test/wpt/tests/xhr/access-control-preflight-request-header-sorted.htm
new file mode 100644
index 00000000000..830e0fbc4f4
--- /dev/null
+++ b/test/wpt/tests/xhr/access-control-preflight-request-header-sorted.htm
@@ -0,0 +1,28 @@
+<!DOCTYPE html>
+<html>
+<head>
+<title>Tests that Access-Control-Request-Headers are sorted.</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/common/get-host-info.sub.js"></script>
+</head>
+<body>
+<script>
+async_test((test) => {
+  const xhr = new XMLHttpRequest();
+  const url = get_host_info().HTTP_REMOTE_ORIGIN + '/xhr/resources/access-control-preflight-request-header-sorted.py';
+  xhr.open('GET', url);
+  xhr.setRequestHeader("X-Custom-Test", "foobar");
+  xhr.setRequestHeader("X-Custom-ua", "foobar");
+  xhr.setRequestHeader("X-Custom-V", "foobar");
+  xhr.setRequestHeader("X-Custom-s", "foobar");
+  xhr.setRequestHeader("X-Custom-U", "foobar");
+  xhr.onerror = test.unreached_func('xhr failure');
+  xhr.onload = test.step_func_done(() => {
+    assert_equals(xhr.responseText, 'PASS');
+  });
+  xhr.send();
+});
+</script>
+</body>
+</html>
diff --git a/test/wpt/tests/xhr/access-control-preflight-request-headers-origin.htm b/test/wpt/tests/xhr/access-control-preflight-request-headers-origin.htm
new file mode 100644
index 00000000000..fc11abc04fb
--- /dev/null
+++ b/test/wpt/tests/xhr/access-control-preflight-request-headers-origin.htm
@@ -0,0 +1,29 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>Test that 'Origin' is not included in Access-Control-Request-Headers in a preflight request</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <script src="/common/get-host-info.sub.js"></script>
+  </head>
+  <body>
+    <script type="text/javascript">
+async_test((test) => {
+  const xhr = new XMLHttpRequest;
+  const url = get_host_info().HTTP_REMOTE_ORIGIN +
+      "/xhr/resources/access-control-preflight-request-headers-origin.py";
+
+  xhr.open("GET", url);
+  xhr.setRequestHeader("x-pass", "PASS");
+
+  xhr.onerror = test.unreached_func("Unexpected error");
+
+  xhr.onload = test.step_func_done(() => {
+    assert_equals(xhr.responseText, "PASS");
+  });
+
+  xhr.send();
+}, "'Origin' should not be included in CORS Request-Headers");
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/access-control-preflight-request-invalid-status-301.htm b/test/wpt/tests/xhr/access-control-preflight-request-invalid-status-301.htm
new file mode 100644
index 00000000000..62fc4803b43
--- /dev/null
+++ b/test/wpt/tests/xhr/access-control-preflight-request-invalid-status-301.htm
@@ -0,0 +1,28 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>Tests that preflight requests returning invalid 301 status code result in error.</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <script src="/common/get-host-info.sub.js"></script>
+  </head>
+  <body>
+    <script type="text/javascript">
+    async_test((test) => {
+      const xhr = new XMLHttpRequest;
+
+      xhr.open("GET", get_host_info().HTTP_REMOTE_ORIGIN + "/xhr/resources/access-control-preflight-request-invalid-status.py?code=301");
+
+      xhr.setRequestHeader("x-pass", "pass");
+
+      xhr.onerror = test.step_func_done(function() {
+        assert_equals(xhr.status, 0);
+      });
+
+      xhr.onload = test.unreached_func("Invalid 301 response to preflight should result in error.");
+
+      xhr.send();
+    }, "Request with 301 preflight response");
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/access-control-preflight-request-invalid-status-400.htm b/test/wpt/tests/xhr/access-control-preflight-request-invalid-status-400.htm
new file mode 100644
index 00000000000..9e76d9e1308
--- /dev/null
+++ b/test/wpt/tests/xhr/access-control-preflight-request-invalid-status-400.htm
@@ -0,0 +1,28 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>Tests that preflight requests returning invalid 400 status code result in error.</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <script src="/common/get-host-info.sub.js"></script>
+  </head>
+  <body>
+    <script type="text/javascript">
+    async_test((test) => {
+      const xhr = new XMLHttpRequest;
+
+      xhr.open("GET", get_host_info().HTTP_REMOTE_ORIGIN + "/xhr/resources/access-control-preflight-request-invalid-status.py?code=400");
+
+      xhr.setRequestHeader("x-pass", "pass");
+
+      xhr.onerror = test.step_func_done(function() {
+        assert_equals(xhr.status, 0);
+      });
+
+      xhr.onload = test.unreached_func("Invalid 400 response to preflight should result in error.");
+
+      xhr.send();
+    }, "Request with 400 preflight response");
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/access-control-preflight-request-invalid-status-501.htm b/test/wpt/tests/xhr/access-control-preflight-request-invalid-status-501.htm
new file mode 100644
index 00000000000..f2ed85bc17e
--- /dev/null
+++ b/test/wpt/tests/xhr/access-control-preflight-request-invalid-status-501.htm
@@ -0,0 +1,28 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>Tests that preflight requests returning invalid 501 status code result in error.</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <script src="/common/get-host-info.sub.js"></script>
+  </head>
+  <body>
+    <script type="text/javascript">
+    async_test((test) => {
+      const xhr = new XMLHttpRequest;
+
+      xhr.open("GET", get_host_info().HTTP_REMOTE_ORIGIN + "/xhr/resources/access-control-preflight-request-invalid-status.py?code=501");
+
+      xhr.setRequestHeader("x-pass", "pass");
+
+      xhr.onerror = test.step_func_done(function() {
+        assert_equals(xhr.status, 0);
+      });
+
+      xhr.onload = test.unreached_func("Invalid 501 response to preflight should result in error.");
+
+      xhr.send();
+    }, "Request with 501 preflight response");
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/access-control-preflight-request-must-not-contain-cookie.htm b/test/wpt/tests/xhr/access-control-preflight-request-must-not-contain-cookie.htm
new file mode 100644
index 00000000000..6dd8e6db888
--- /dev/null
+++ b/test/wpt/tests/xhr/access-control-preflight-request-must-not-contain-cookie.htm
@@ -0,0 +1,57 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>Preflight request must not contain any cookie header</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <script src="/common/get-host-info.sub.js"></script>
+  </head>
+  <body>
+    <script type="text/javascript">
+    async_test((test) => {
+      function setupCookie() {
+        const xhr = new XMLHttpRequest;
+        // Delete all preexisting cookies and set a cookie named "foo"
+        xhr.open("GET", get_host_info().HTTP_REMOTE_ORIGIN +
+            "/xhr/resources/access-control-cookie.py?cookie_name=foo");
+        xhr.withCredentials = true;
+        xhr.send();
+        xhr.onerror = test.unreached_func("Unexpected error.");
+        xhr.onload = test.step_func(() => {
+          assert_equals(xhr.status, 200);
+          sendPreflightedRequest();
+        });
+      }
+
+      function sendPreflightedRequest() {
+        const xhr = new XMLHttpRequest;
+        // Request to server-side file fails if cookie is included in preflight
+        xhr.open("GET", get_host_info().HTTP_REMOTE_ORIGIN +
+          "/xhr/resources/access-control-preflight-request-must-not-contain-cookie.py");
+        xhr.withCredentials = true;
+        xhr.setRequestHeader("X-Proprietary-Header", "foo");
+        xhr.onerror = test.unreached_func("Unexpected error.");
+        xhr.onload = test.step_func(() => {
+          assert_equals(xhr.status, 200);
+          assert_equals(xhr.responseText, "COOKIE");
+          cleanupCookies();
+        });
+        xhr.send();
+      }
+
+      function cleanupCookies() {
+        const xhr = new XMLHttpRequest;
+        // Delete all cookies
+        xhr.open("GET", get_host_info().HTTP_REMOTE_ORIGIN +
+            "/xhr/resources/access-control-cookie.py");
+        xhr.withCredentials = true;
+        xhr.send();
+        xhr.onerror = test.unreached_func("Unexpected error.");
+        xhr.onload = test.step_func_done(() => {});
+      }
+
+      setupCookie();
+    });
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/access-control-preflight-sync-header-denied.htm b/test/wpt/tests/xhr/access-control-preflight-sync-header-denied.htm
new file mode 100644
index 00000000000..8697f1ede95
--- /dev/null
+++ b/test/wpt/tests/xhr/access-control-preflight-sync-header-denied.htm
@@ -0,0 +1,34 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>Sync request denied at preflight because of non-CORS-safelisted header</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <script src="/common/get-host-info.sub.js"></script>
+    <script src="/common/utils.js"></script>
+  </head>
+  <body>
+    <script type="text/javascript">
+const uuid = token();
+const url = get_host_info().HTTP_REMOTE_ORIGIN +
+    "/xhr/resources/access-control-preflight-denied.py?token=" + uuid;
+
+test(() => {
+  let xhr = new XMLHttpRequest;
+  xhr.open("GET", url + "&command=reset", false);
+  xhr.send();
+
+  xhr = new XMLHttpRequest;
+  xhr.open("GET", url + "&command=header", false);
+  xhr.setRequestHeader("x-test", "foo");
+
+  assert_throws_dom("NetworkError", () => xhr.send());
+
+  xhr = new XMLHttpRequest;
+  xhr.open("GET", url + "&command=complete", false);
+  xhr.send();
+  assert_equals(xhr.responseText, "Request successfully blocked.");
+}, "Sync request denied at preflight");
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/access-control-preflight-sync-method-denied.htm b/test/wpt/tests/xhr/access-control-preflight-sync-method-denied.htm
new file mode 100644
index 00000000000..0ca6c5cdf4a
--- /dev/null
+++ b/test/wpt/tests/xhr/access-control-preflight-sync-method-denied.htm
@@ -0,0 +1,33 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>Sync request denied at preflight because of non-CORS-safelisted method</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <script src="/common/get-host-info.sub.js"></script>
+    <script src="/common/utils.js"></script>
+  </head>
+  <body>
+    <script type="text/javascript">
+const uuid = token();
+const url = get_host_info().HTTP_REMOTE_ORIGIN +
+      "/xhr/resources/access-control-preflight-denied.py?token=" + uuid;
+
+test(() => {
+  let xhr = new XMLHttpRequest;
+  xhr.open("GET", url + "&command=reset", false);
+  xhr.send();
+
+  xhr = new XMLHttpRequest;
+  xhr.open("DELETE", url + "&command=method", false);
+
+  assert_throws_dom("NetworkError", () => xhr.send());
+
+  xhr = new XMLHttpRequest;
+  xhr.open("GET", url + "&command=complete", false);
+  xhr.send();
+  assert_equals(xhr.responseText, "Request successfully blocked.");
+});
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/access-control-preflight-sync-not-supported.htm b/test/wpt/tests/xhr/access-control-preflight-sync-not-supported.htm
new file mode 100644
index 00000000000..f5df4a2d4b5
--- /dev/null
+++ b/test/wpt/tests/xhr/access-control-preflight-sync-not-supported.htm
@@ -0,0 +1,33 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>Sync PUT request denied at preflight</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <script src="/common/get-host-info.sub.js"></script>
+    <script src="/common/utils.js"></script>
+  </head>
+  <body>
+    <script type="text/javascript">
+const uuid = token();
+const url = get_host_info().HTTP_REMOTE_ORIGIN +
+      "/xhr/resources/access-control-preflight-denied.py?token=" + uuid;
+
+test(() => {
+  let xhr = new XMLHttpRequest;
+  xhr.open("GET", url + "&command=reset", false);
+  xhr.send();
+
+  xhr = new XMLHttpRequest;
+  xhr.open("PUT", url, false);
+
+  assert_throws_dom("NetworkError", () => xhr.send(""));
+
+  xhr = new XMLHttpRequest;
+  xhr.open("GET", url + "&command=complete", false);
+  xhr.send();
+  assert_equals(xhr.responseText, "Request successfully blocked.");
+});
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/access-control-recursive-failed-request.htm b/test/wpt/tests/xhr/access-control-recursive-failed-request.htm
new file mode 100644
index 00000000000..2c2bcef48b9
--- /dev/null
+++ b/test/wpt/tests/xhr/access-control-recursive-failed-request.htm
@@ -0,0 +1,38 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>Recursively repeated CORS requests with failed preflights should never result in unexpected behavior</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <script src="/common/get-host-info.sub.js"></script>
+  </head>
+  <body>
+    <script type="text/javascript">
+let requestCount = 0;
+const requestMax = 10;
+
+async_test((test) => {
+  function preflightRequest() {
+    const xhr = new XMLHttpRequest;
+
+    xhr.onload = test.unreached_func("Request succeeded unexpectedly.");
+
+    xhr.onerror = test.step_func(() => {
+      assert_equals(xhr.status, 0);
+      if (++requestCount >= requestMax) {
+        test.done();
+        return;
+      }
+      preflightRequest();
+    });
+
+    xhr.open("GET", get_host_info().HTTP_REMOTE_ORIGIN +
+        "/xhr/resources/access-control-basic-denied.py");
+    xhr.send();
+  }
+
+  preflightRequest();
+});
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/access-control-response-with-body-sync.htm b/test/wpt/tests/xhr/access-control-response-with-body-sync.htm
new file mode 100644
index 00000000000..d4c90aece06
--- /dev/null
+++ b/test/wpt/tests/xhr/access-control-response-with-body-sync.htm
@@ -0,0 +1,25 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>Tests body from CORS preflight response and actual response with sync request</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <script src="/common/get-host-info.sub.js"></script>
+  </head>
+  <body>
+    <script type="text/javascript">
+test(() => {
+  const xhr = new XMLHttpRequest;
+
+  xhr.open("GET", get_host_info().HTTP_REMOTE_ORIGIN+
+      "/xhr/resources/access-control-allow-with-body.py", false);
+  xhr.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
+  xhr.setRequestHeader("X-Requested-With", "XMLHttpRequest");
+  xhr.send();
+
+  assert_equals(xhr.status, 200);
+  assert_equals(xhr.responseText, "PASS");
+});
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/access-control-response-with-body.htm b/test/wpt/tests/xhr/access-control-response-with-body.htm
new file mode 100644
index 00000000000..3ab0521106b
--- /dev/null
+++ b/test/wpt/tests/xhr/access-control-response-with-body.htm
@@ -0,0 +1,29 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>Tests that XHR doesn't prepend the body from CORS preflight response to the actual response</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <script src="/common/get-host-info.sub.js"></script>
+  </head>
+  <body>
+    <script type="text/javascript">
+async_test((test) => {
+  const xhr = new XMLHttpRequest;
+
+  xhr.onerror = test.unreached_func("Unexpected error.");
+
+  xhr.onload = test.step_func_done(() => {
+    assert_equals(xhr.status, 200);
+    assert_equals(xhr.responseText, "PASS");
+  });
+
+  xhr.open("GET", get_host_info().HTTP_REMOTE_ORIGIN +
+      "/xhr/resources/access-control-allow-with-body.py");
+  xhr.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
+  xhr.setRequestHeader("X-Requested-With", "XMLHttpRequest");
+  xhr.send();
+});
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/access-control-response-with-exposed-headers.htm b/test/wpt/tests/xhr/access-control-response-with-exposed-headers.htm
new file mode 100644
index 00000000000..c6f7bf5c6a6
--- /dev/null
+++ b/test/wpt/tests/xhr/access-control-response-with-exposed-headers.htm
@@ -0,0 +1,38 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>Test CORS response with 'Access-Control-Expose-Headers' header</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <script src="/common/get-host-info.sub.js"></script>
+  </head>
+  <body>
+    <script type="text/javascript">
+async_test((test) => {
+  const xhr = new XMLHttpRequest;
+
+  xhr.open("GET", get_host_info().HTTP_REMOTE_ORIGIN +
+      "/xhr/resources/pass.txt?pipe=" +
+      "header(Cache-Control,no-cache)|" +
+      "header(Access-Control-Max-Age,0)|" +
+      "header(Access-Control-Allow-Origin,*)|" +
+      "header(X-foo,BAR)|" +
+      "header(x-test,TEST)|" +
+      "header(Access-Control-Expose-Headers,x-Foo)|",
+      "header(Content-Type,text/html)");
+
+  xhr.onerror = test.unreached_func("Unexpected error");
+
+  xhr.onload = test.step_func_done(() => {
+    assert_equals(xhr.status, 200);
+    assert_equals(xhr.getResponseHeader("X-FOO"), "BAR");
+    assert_equals(xhr.getResponseHeader("x-foo"), "BAR");
+    assert_equals(xhr.getResponseHeader("x-test"), null);
+    assert_equals(xhr.responseText, "PASS\n");
+  });
+
+  xhr.send();
+});
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/access-control-sandboxed-iframe-allow-origin-null.htm b/test/wpt/tests/xhr/access-control-sandboxed-iframe-allow-origin-null.htm
new file mode 100644
index 00000000000..ae966683233
--- /dev/null
+++ b/test/wpt/tests/xhr/access-control-sandboxed-iframe-allow-origin-null.htm
@@ -0,0 +1,32 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>Tests that sandboxed iframe has CORS XHR access to a server that accepts null domain</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <script src="/common/get-host-info.sub.js"></script>
+  </head>
+  <body>
+    <script type="text/javascript">
+async_test((test) => {
+  window.addEventListener("message", test.step_func((evt) => {
+    if (evt.data === "ready") {
+      document.getElementById("frame").contentWindow.postMessage(
+          get_host_info().HTTP_ORIGIN +
+          "/xhr/resources/pass.txt?pipe=" +
+          "header(Cache-Control,no-store)|" +
+          "header(Content-Type,text/plain)|" +
+          "header(Access-Control-Allow-Credentials,true)|" +
+          "header(Access-Control-Allow-External,true)|" +
+          "header(Access-Control-Allow-Origin,null)", "*");
+    } else {
+      assert_equals(evt.data.trim(), "PASS");
+      test.done();
+    }
+  }), false);
+});
+    </script>
+    <iframe id="frame" sandbox="allow-scripts" src="/xhr/resources/access-control-sandboxed-iframe.html">
+    </iframe>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/access-control-sandboxed-iframe-allow.htm b/test/wpt/tests/xhr/access-control-sandboxed-iframe-allow.htm
new file mode 100644
index 00000000000..a3dbed420fe
--- /dev/null
+++ b/test/wpt/tests/xhr/access-control-sandboxed-iframe-allow.htm
@@ -0,0 +1,32 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>Tests that sandboxed iframe has CORS XHR access to a server that accepts all domains</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <script src="/common/get-host-info.sub.js"></script>
+  </head>
+  <body>
+    <script type="text/javascript">
+async_test((test) => {
+  window.addEventListener("message", test.step_func((evt) => {
+    if (evt.data === "ready") {
+      document.getElementById("frame").contentWindow.postMessage(
+          get_host_info().HTTP_ORIGIN +
+          "/xhr/resources/pass.txt?pipe=" +
+          "header(Cache-Control,no-store)|" +
+          "header(Content-Type,text/plain)|" +
+          "header(Access-Control-Allow-Credentials,true)|" +
+          "header(Access-Control-Allow-External,true)|" +
+          "header(Access-Control-Allow-Origin,*)", "*");
+    } else {
+      assert_equals(evt.data.trim(), "PASS");
+      test.done();
+    }
+  }), false);
+});
+    </script>
+    <iframe id="frame" sandbox="allow-scripts" src="/xhr/resources/access-control-sandboxed-iframe.html">
+    </iframe>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/access-control-sandboxed-iframe-denied-without-wildcard.htm b/test/wpt/tests/xhr/access-control-sandboxed-iframe-denied-without-wildcard.htm
new file mode 100644
index 00000000000..a703a922e27
--- /dev/null
+++ b/test/wpt/tests/xhr/access-control-sandboxed-iframe-denied-without-wildcard.htm
@@ -0,0 +1,43 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>Tests that sandboxed iframe does not have CORS XHR access to server with "Access-Control-Allow-Origin" set to the original origin</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <script src="/common/get-host-info.sub.js"></script>
+  </head>
+  <body>
+    <script type="text/javascript">
+const path = "/xhr/resources/pass.txt?pipe=" +
+    "header(Cache-Control,no-store)|" +
+    "header(Content-Type,text/plain)" +
+    "header(Access-Control-Allow-Credentials,true)|" +
+    "header(Access-Control-Allow-Origin," + get_host_info().HTTP_ORIGIN + ")";
+
+async_test((test) => {
+  const xhr = new XMLHttpRequest;
+  xhr.open("GET", get_host_info().HTTP_REMOTE_ORIGIN + path);
+  xhr.send();
+  xhr.onerror = test.unreached_func("Unexpected error");
+  xhr.onload = test.step_func_done(() => {
+    assert_equals(xhr.status, 200);
+    assert_equals(xhr.responseText.trim(), "PASS");
+  });
+}, "Check that path exists and is accessible via CORS XHR request");
+
+async_test((test) => {
+  window.addEventListener("message", test.step_func((evt) => {
+    if (evt.data === "ready") {
+      document.getElementById("frame").contentWindow.postMessage(
+          get_host_info().HTTP_REMOTE_ORIGIN + path, "*");
+    } else {
+      assert_equals(evt.data, "Exception thrown. Sandboxed iframe XHR access was denied in 'send'.");
+      test.done();
+    }
+  }), false);
+}, "Sandboxed iframe is denied CORS access to server that allows parent origin");
+    </script>
+    <iframe id="frame" sandbox="allow-scripts" src="/xhr/resources/access-control-sandboxed-iframe.html">
+    </iframe>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/access-control-sandboxed-iframe-denied.htm b/test/wpt/tests/xhr/access-control-sandboxed-iframe-denied.htm
new file mode 100644
index 00000000000..5b629917041
--- /dev/null
+++ b/test/wpt/tests/xhr/access-control-sandboxed-iframe-denied.htm
@@ -0,0 +1,41 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>Tests that sandboxed iframe does not have CORS XHR access to its server</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <script src="/common/get-host-info.sub.js"></script>
+  </head>
+  <body>
+    <script type="text/javascript">
+const path = "/xhr/resources/pass.txt?pipe=" +
+    "header(Cache-Control,no-store)|" +
+    "header(Content-Type,text/plain)";
+
+async_test((test) => {
+  const xhr = new XMLHttpRequest;
+  xhr.open("GET", get_host_info().HTTP_ORIGIN + path);
+  xhr.send();
+  xhr.onerror = test.unreached_func("Unexpected error");
+  xhr.onload = test.step_func_done(() => {
+    assert_equals(xhr.status, 200);
+    assert_equals(xhr.responseText.trim(), "PASS");
+  });
+}, "Check that path exists and is accessible via local XHR request");
+
+async_test((test) => {
+  window.addEventListener("message", test.step_func((evt) => {
+    if (evt.data === "ready") {
+      document.getElementById("frame").contentWindow.postMessage(
+          get_host_info().HTTP_ORIGIN + path, "*");
+    } else {
+      assert_equals(evt.data, "Exception thrown. Sandboxed iframe XHR access was denied in 'send'.");
+      test.done();
+    }
+  }), false);
+}, "Sandboxed iframe is denied access to path");
+    </script>
+    <iframe id="frame" sandbox="allow-scripts" src="/xhr/resources/access-control-sandboxed-iframe.html">
+    </iframe>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/allow-lists-starting-with-comma.htm b/test/wpt/tests/xhr/allow-lists-starting-with-comma.htm
new file mode 100644
index 00000000000..ece699bf5d7
--- /dev/null
+++ b/test/wpt/tests/xhr/allow-lists-starting-with-comma.htm
@@ -0,0 +1,33 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>Allow lists starting with a comma should be parsed correctly</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <script src="/common/get-host-info.sub.js"></script>
+  </head>
+  <body>
+  <script type="text/javascript">
+    async_test(function(test) {
+      const client = new XMLHttpRequest();
+      let url = "xhr/resources/access-control-allow-lists.py?headers=,y-lol,x-print,%20,,,y-print&origin=" +
+          get_host_info().HTTP_ORIGIN;
+      client.open("GET", get_host_info().HTTP_REMOTE_ORIGIN + '/' + url, false);
+      client.setRequestHeader('x-print', 'unicorn')
+      client.setRequestHeader('y-print', 'narwhal')
+      // Sending GET request with custom headers
+      assert_equals(client.send(null), undefined);
+      const response = JSON.parse(client.response);
+      assert_equals(response['x-print'], "unicorn");
+      assert_equals(response['y-print'], "narwhal");
+
+      url = "xhr/resources/access-control-allow-lists.py?methods=,,PUT,GET&origin=" +
+          get_host_info().HTTP_ORIGIN;
+      client.open("PUT", get_host_info().HTTP_REMOTE_ORIGIN + '/' + url, false);
+      // Sending PUT request
+      assert_equals(client.send(null), undefined);
+      test.done();
+    }, "Allow lists starting with a comma should be parsed correctly");
+  </script>
+  </body>
+  </html>
diff --git a/test/wpt/tests/xhr/anonymous-mode-unsupported.htm b/test/wpt/tests/xhr/anonymous-mode-unsupported.htm
new file mode 100644
index 00000000000..f995ec2a94e
--- /dev/null
+++ b/test/wpt/tests/xhr/anonymous-mode-unsupported.htm
@@ -0,0 +1,40 @@
+<!doctype html>
+<html>
+  <head>
+    <title>XMLHttpRequest: anonymous mode unsupported</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+  </head>
+  <body>
+    <div id="log"></div>
+    <script>
+    /*
+      Older versions of the XMLHttpRequest spec had an 'anonymous' mode
+      The point of this mode was to handle same-origin requests like other-origin requests,
+      i.e. require preflight, drop authentication data (cookies and HTTP auth)
+      Also the Origin: and Referer: headers would not be sent
+
+      This mode was dropped due to lack of implementations and interest,
+      and this test is here just to assert failure if any implementation
+      supports this based on an older spec version.
+    */
+      document.cookie = 'test=anonymous-mode-unsupported'
+      test = async_test();
+      test.add_cleanup(function(){
+        // make sure we clean up the cookie again to avoid confusing other tests..
+        document.cookie = 'test=;expires=Fri, 28 Feb 2014 07:25:59 GMT';
+      })
+      test.step(function() {
+        var client = new XMLHttpRequest({anonymous:true})
+        client.open("GET", "resources/inspect-headers.py?filter_name=cookie")
+        client.onreadystatechange = test.step_func(function(){
+          if(client.readyState === 4){
+            assert_equals(client.responseText, 'Cookie: test=anonymous-mode-unsupported\n', 'The deprecated anonymous:true should be ignored, cookie sent anyway')
+            test.done();
+          }
+        });
+        client.send(null)
+      })
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/close-worker-with-xhr-in-progress.html b/test/wpt/tests/xhr/close-worker-with-xhr-in-progress.html
new file mode 100644
index 00000000000..4d03bea028f
--- /dev/null
+++ b/test/wpt/tests/xhr/close-worker-with-xhr-in-progress.html
@@ -0,0 +1,26 @@
+<!doctype html>
+<html>
+<head>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script>
+async_test(t => {
+  function workerCode(origin) {
+    const xhr = new XMLHttpRequest();
+    xhr.open('GET', origin + '/xhr/resources/image.gif?pipe=trickle(100:d2)', true);
+    xhr.responseType = 'blob';
+    xhr.send();
+    postMessage('sent');
+  }
+
+  const workerBlob = new Blob([workerCode.toString() + ";workerCode('" + location.origin + "');"], {type:"application/javascript"});
+  const w = new Worker(URL.createObjectURL(workerBlob));
+  w.onmessage = t.step_func(e => {
+    assert_equals(e.data, 'sent');
+    t.step_timeout(t.step_func(() => {
+      w.terminate();
+      t.step_timeout(t.step_func_done(() => {}), 500);
+    }, 100));
+  });
+}, 'Terminating a worker with a XHR in progress doesn\'t crash');
+</script>
diff --git a/test/wpt/tests/xhr/content-type-unmodified.any.js b/test/wpt/tests/xhr/content-type-unmodified.any.js
new file mode 100644
index 00000000000..92705d6e9bc
--- /dev/null
+++ b/test/wpt/tests/xhr/content-type-unmodified.any.js
@@ -0,0 +1,16 @@
+"use strict";
+
+async_test(t => {
+  const xhr = new XMLHttpRequest();
+
+  xhr.open("POST", "resources/echo-content-type.py");
+  xhr.setRequestHeader("content-type", "application/json; charset=UTF-8");
+
+  xhr.onerror = t.unreached_func("Error occurred.");
+
+  xhr.onload = t.step_func_done(() => {
+    assert_equals(xhr.status, 200);
+    assert_equals(xhr.responseText, "application/json; charset=UTF-8");
+  });
+  xhr.send("{ \"x\":\"a\"}");
+});
diff --git a/test/wpt/tests/xhr/cookies.http.html b/test/wpt/tests/xhr/cookies.http.html
new file mode 100644
index 00000000000..0ab71dd168a
--- /dev/null
+++ b/test/wpt/tests/xhr/cookies.http.html
@@ -0,0 +1,41 @@
+<!doctype html>
+<meta charset=utf-8>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<body>
+<p>Derived from historical testcase for <a href="http://bugs.webkit.org/show_bug.cgi?id=3420">WebKit bug 3420</a>:
+XMLHttpRequest does not handle set-cookie headers.</p>
+
+<script>
+    function clearCookies()
+    {
+      return new Promise(resolve => {
+        var req = new XMLHttpRequest;
+        req.open("POST", "resources/get-set-cookie.py?clear=1");
+        req.onload = () => resolve();
+        req.send("");
+      });
+    }
+    function getAndSetCookies()
+    {
+      return new Promise(resolve => {
+        var req = new XMLHttpRequest;
+        req.open("POST", "resources/get-set-cookie.py");
+        req.onload = () => resolve(req.responseText);
+        req.send("");
+      });
+    }
+
+    promise_test(async function(t) {
+      await clearCookies();
+      var response = await getAndSetCookies();
+      assert_equals(response.match(/.*WK-test=1.*/), null,
+                    "The cookie must not be present after clear. clearCookies() failed.  Must be a bug in the test!");
+      var response = await getAndSetCookies();
+      assert_equals(response.match(/.*WK-test-secure=1.*/), null,
+                    "a secure cookie was sent via HTTP");
+      assert_regexp_match(response, /.*WK-test=1.*/, "an insecure cookie was sent");
+      await clearCookies();
+    }, "Basic non-cross-site cookie handling in XHR");
+</script>
+</html>
diff --git a/test/wpt/tests/xhr/cors-expose-star.sub.any.js b/test/wpt/tests/xhr/cors-expose-star.sub.any.js
new file mode 100644
index 00000000000..9d88046806c
--- /dev/null
+++ b/test/wpt/tests/xhr/cors-expose-star.sub.any.js
@@ -0,0 +1,52 @@
+// META: script=../fetch/api/resources/utils.js
+
+const url = "http://{{host}}:{{ports[http][1]}}" + dirname(location.pathname) + "resources/top.txt",
+      sharedHeaders = "?pipe=header(Access-Control-Expose-Headers,*)|header(Test,X)|header(*,whoa)|"
+
+async_test(function() {
+  const headers = "header(Access-Control-Allow-Origin,*)"
+  var client = new XMLHttpRequest();
+  client.open("GET", url + sharedHeaders + headers);
+  client.send();
+  client.onreadystatechange = this.step_func(function () {
+    if (this.readyState == this.HEADERS_RECEIVED) {
+      assert_equals(client.getResponseHeader("test"), "X");
+      assert_equals(client.getResponseHeader("set-cookie"), null);
+      assert_equals(client.getResponseHeader("*"), "whoa");
+      this.done();
+    }
+  });
+}, "Basic Access-Control-Expose-Headers: * support")
+
+async_test(function() {
+  const origin = location.origin, // assuming an ASCII origin
+        headers = "header(Access-Control-Allow-Origin," + origin + ")|header(Access-Control-Allow-Credentials,true)"
+  var client = new XMLHttpRequest();
+  client.open("GET", url + sharedHeaders + headers);
+  client.withCredentials = true;
+  client.send();
+  client.onreadystatechange = this.step_func(function () {
+    if (this.readyState == this.HEADERS_RECEIVED) {
+      assert_equals(client.getResponseHeader("content-type"), "text/plain"); // safelisted
+      assert_equals(client.getResponseHeader("test"), null);
+      assert_equals(client.getResponseHeader("set-cookie"), null);
+      assert_equals(client.getResponseHeader("*"), "whoa");
+      this.done();
+    }
+  });
+}, "* for credentialed fetches only matches literally")
+
+async_test(function() {
+  const headers =  "header(Access-Control-Allow-Origin,*)|header(Access-Control-Expose-Headers,set-cookie\\,*)"
+  var client = new XMLHttpRequest();
+  client.open("GET", url + sharedHeaders + headers);
+  client.send();
+  client.onreadystatechange = this.step_func(function () {
+    if (this.readyState == this.HEADERS_RECEIVED) {
+      assert_equals(client.getResponseHeader("test"), "X");
+      assert_equals(client.getResponseHeader("set-cookie"), null);
+      assert_equals(client.getResponseHeader("*"), "whoa");
+      this.done();
+    }
+  });
+}, "* can be one of several values")
diff --git a/test/wpt/tests/xhr/cors-upload.any.js b/test/wpt/tests/xhr/cors-upload.any.js
new file mode 100644
index 00000000000..3beb0637ccf
--- /dev/null
+++ b/test/wpt/tests/xhr/cors-upload.any.js
@@ -0,0 +1,59 @@
+// META: title=Cross-Origin POST with preflight and FormData body should send body
+// META: script=/common/get-host-info.sub.js
+"use strict";
+
+function testCorsFormDataUpload(description, path, method, form, headers, withCredentials) {
+  const test = async_test(description);
+  const client = new XMLHttpRequest();
+  const url = corsURL(path);
+
+  client.open(method, url, true);
+  client.withCredentials = withCredentials;
+  for (const key of Object.keys(headers)) {
+    client.setRequestHeader(key, headers[key]);
+  }
+
+  client.send(form);
+
+  client.onload = () => {
+    test.step(() => {
+      assert_equals(client.status, 200);
+      assert_regexp_match(client.responseText, /Content-Disposition: form-data/);
+
+      for (const key of form.keys()) {
+        assert_regexp_match(client.responseText, new RegExp(key));
+        assert_regexp_match(client.responseText, new RegExp(form.get(key)));
+      }
+    });
+    test.done();
+  };
+}
+
+function corsURL(path) {
+  const url = new URL(path, location.href);
+  url.hostname = get_host_info().REMOTE_HOST;
+  return url.href;
+}
+
+const form = new FormData();
+form.append("key", "value");
+
+testCorsFormDataUpload(
+  "Cross-Origin POST FormData body but no preflight",
+  "resources/echo-content-cors.py",
+  "POST",
+  form,
+  {},
+  false
+);
+
+testCorsFormDataUpload(
+  "Cross-Origin POST with preflight and FormData body",
+  "resources/echo-content-cors.py",
+  "POST",
+  form,
+  {
+    Authorization: "Bearer access-token"
+  },
+  true
+);
diff --git a/test/wpt/tests/xhr/data-uri.htm b/test/wpt/tests/xhr/data-uri.htm
new file mode 100644
index 00000000000..88a7d78fc59
--- /dev/null
+++ b/test/wpt/tests/xhr/data-uri.htm
@@ -0,0 +1,41 @@
+<!doctype html>
+<meta charset=utf-8>
+<title>XMLHttpRequest: data URLs</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<div id="log"></div>
+
+<script>
+  function do_test(method, url, mimeType, testNamePostfix) {
+    if (typeof mimeType === 'undefined' || mimeType === null) mimeType = 'text/plain';
+    var test = async_test("XHR method " + method + " with MIME type " + mimeType + (testNamePostfix||''));
+    test.step(function() {
+      var client = new XMLHttpRequest(),
+          body = method === "HEAD" ? "" : "Hello, World!";
+      client.onreadystatechange = test.step_func(function () {
+        if (client.readyState !== 4) {
+          return;
+        }
+        assert_equals(client.responseText, body);
+        assert_equals(client.status, 200);
+        assert_equals(client.getResponseHeader('Content-Type'), mimeType);
+        var allHeaders = client.getAllResponseHeaders();
+        assert_regexp_match(allHeaders, /content\-type\:/i, 'getAllResponseHeaders() includes Content-Type');
+        assert_false(/content\-length\:/i.test(allHeaders), 'getAllResponseHeaders() must not include Content-Length');
+        test.done();
+      });
+      client.open(method, url);
+      client.send(null);
+    });
+  }
+  do_test('GET', "data:text/plain,Hello, World!");
+  do_test('GET', "data:text/plain;base64,SGVsbG8sIFdvcmxkIQ==", undefined, " (base64)");
+  do_test('GET', "data:text/html,Hello, World!", 'text/html');
+  do_test('GET', "data:text/html;charset=UTF-8,Hello, World!", 'text/html;charset=UTF-8');
+  do_test('GET', "data:image/png,Hello, World!", 'image/png');
+  do_test('POST', "data:text/plain,Hello, World!");
+  do_test('PUT', "data:text/plain,Hello, World!");
+  do_test('DELETE', "data:text/plain,Hello, World!");
+  do_test('HEAD', "data:text/plain,Hello, World!");
+  do_test('UNICORN', "data:text/plain,Hello, World!");
+</script>
diff --git a/test/wpt/tests/xhr/event-abort.any.js b/test/wpt/tests/xhr/event-abort.any.js
new file mode 100644
index 00000000000..5b17ece0085
--- /dev/null
+++ b/test/wpt/tests/xhr/event-abort.any.js
@@ -0,0 +1,15 @@
+// META: title=XMLHttpRequest: abort event
+
+var test = async_test();
+test.step(function () {
+  var client = new XMLHttpRequest();
+  client.onabort = test.step_func(function () {
+    test.done();
+  });
+  client.open("GET", "resources/well-formed.xml");
+  client.send(null);
+  client.abort();
+  test.step_timeout(() => {
+    assert_unreached("onabort not called after 4 ms");
+  }, 4);
+});
diff --git a/test/wpt/tests/xhr/event-error-order.sub.html b/test/wpt/tests/xhr/event-error-order.sub.html
new file mode 100644
index 00000000000..f03707eb98d
--- /dev/null
+++ b/test/wpt/tests/xhr/event-error-order.sub.html
@@ -0,0 +1,35 @@
+<!DOCTYPE html>
+<html>
+<head>
+    <meta name="assert" content="Check the order of events fired when the request has failed.">
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <script src="resources/xmlhttprequest-event-order.js"></script>
+    <title>XMLHttpRequest: event - error (order of events)</title>
+</head>
+
+<body>
+    <div id="log"></div>
+
+    <script type="text/javascript">
+        var test = async_test();
+
+        test.step(function()
+        {
+            var xhr = new XMLHttpRequest();
+            prepare_xhr_for_event_order_test(xhr);
+
+            xhr.addEventListener("loadend", function() {
+                test.step(function() {
+                    // no progress events due to CORS failure
+                    assert_xhr_event_order_matches([1, "loadstart(0,0,false)", "upload.loadstart(0,12,true)", 4, "upload.error(0,0,false)", "upload.loadend(0,0,false)", "error(0,0,false)", "loadend(0,0,false)"]);
+                    test.done();
+                });
+            });
+
+            xhr.open("POST", "http://nonexistent.{{host}}:{{ports[http][0]}}", true);
+            xhr.send("Test Message");
+        });
+    </script>
+</body>
+</html>
diff --git a/test/wpt/tests/xhr/event-error.sub.any.js b/test/wpt/tests/xhr/event-error.sub.any.js
new file mode 100644
index 00000000000..ecc4678e682
--- /dev/null
+++ b/test/wpt/tests/xhr/event-error.sub.any.js
@@ -0,0 +1,28 @@
+// META: title=XMLHttpRequest Test: event - error
+
+async_test(function(t) {
+  var client = new XMLHttpRequest();
+  client.onerror = t.step_func(function (e) {
+    assert_true(e instanceof ProgressEvent);
+    assert_equals(e.type, "error");
+    t.done();
+  });
+
+  client.open('GET', 'http://nonexistent.{{host}}:{{ports[http][0]}}');
+  client.send('null');
+}, 'onerror should be called');
+
+async_test((t) => {
+  const xhr = new XMLHttpRequest();
+  xhr.open('GET', 'resources/bad-chunk-encoding.py');
+  xhr.addEventListener('load', t.unreached_func('load'));
+  xhr.addEventListener('error', t.step_func((e) => {
+    assert_equals(e.loaded, 0, 'loaded');
+    assert_equals(e.total, 0, 'total');
+  }));
+  xhr.addEventListener('loadend', t.step_func_done((e) => {
+    assert_equals(e.loaded, 0, 'loaded');
+    assert_equals(e.total, 0, 'total');
+  }));
+  xhr.send();
+}, 'error while reading body should report zeros for loaded and total');
diff --git a/test/wpt/tests/xhr/event-load.any.js b/test/wpt/tests/xhr/event-load.any.js
new file mode 100644
index 00000000000..dcb92cc980d
--- /dev/null
+++ b/test/wpt/tests/xhr/event-load.any.js
@@ -0,0 +1,21 @@
+// META: title=XMLHttpRequest: The send() method: Fire an event named load (synchronous flag is unset)
+
+var test = async_test();
+test.step(function () {
+  var client = new XMLHttpRequest();
+  client.onload = test.step_func(function (e) {
+    assert_true(e instanceof ProgressEvent);
+    assert_equals(e.type, "load");
+    assert_equals(client.readyState, 4);
+    test.done();
+  });
+  client.onreadystatechange = test.step_func(function () {
+    if (client.readyState !== 4) return;
+
+    test.step_timeout(() => {
+      assert_unreached("Didn't get load event within 4ms of readystatechange==4");
+    }, 4);
+  });
+  client.open("GET", "resources/well-formed.xml");
+  client.send(null);
+});
diff --git a/test/wpt/tests/xhr/event-loadend.any.js b/test/wpt/tests/xhr/event-loadend.any.js
new file mode 100644
index 00000000000..16087b52967
--- /dev/null
+++ b/test/wpt/tests/xhr/event-loadend.any.js
@@ -0,0 +1,19 @@
+// META: title=XMLHttpRequest: loadend event
+
+var test = async_test();
+test.step(function () {
+  var client = new XMLHttpRequest();
+  client.onloadend = test.step_func(function (e) {
+    assert_true(e instanceof ProgressEvent);
+    assert_equals(e.type, "loadend");
+    test.done();
+  });
+  client.onreadystatechange = function () {
+    if (client.readyState !== 4) return;
+    test.step_timeout(() => {
+      assert_unreached("onloadend not called after 100 ms");
+    }, 100);
+  };
+  client.open("GET", "resources/well-formed.xml");
+  client.send(null);
+});
diff --git a/test/wpt/tests/xhr/event-loadstart-upload.any.js b/test/wpt/tests/xhr/event-loadstart-upload.any.js
new file mode 100644
index 00000000000..3918adb66a9
--- /dev/null
+++ b/test/wpt/tests/xhr/event-loadstart-upload.any.js
@@ -0,0 +1,19 @@
+// META: title=XMLHttpRequest: The send() method: Fire a progress event named loadstart on upload object (synchronous flag is unset)
+
+var test = async_test();
+test.step(function () {
+  var client = new XMLHttpRequest();
+  client.upload.onloadstart = test.step_func(function (e) {
+    assert_true(e instanceof ProgressEvent);
+    assert_equals(e.total, 7, 'upload.onloadstart: event.total');
+    assert_equals(e.loaded, 0, 'upload.onloadstart: event.loaded');
+    assert_equals(e.type, "loadstart");
+    test.done();
+  });
+  client.onreadystatechange = test.step_func(function () {
+    if (client.readyState === 4)
+      assert_unreached("onloadstart not called.");
+  });
+  client.open("POST", "resources/trickle.py?ms=5&count=8");
+  client.send('foo=bar');
+});
diff --git a/test/wpt/tests/xhr/event-loadstart.any.js b/test/wpt/tests/xhr/event-loadstart.any.js
new file mode 100644
index 00000000000..55af4c31631
--- /dev/null
+++ b/test/wpt/tests/xhr/event-loadstart.any.js
@@ -0,0 +1,17 @@
+// META: title=XMLHttpRequest: loadstart event
+
+var test = async_test();
+test.step(function () {
+  var client = new XMLHttpRequest();
+  client.onloadstart = test.step_func(function (e) {
+    assert_true(e instanceof ProgressEvent);
+    assert_equals(e.type, "loadstart");
+    assert_equals(client.readyState, 1);
+    test.done();
+  });
+  test.step_timeout(function () {
+    assert_unreached("onloadstart not called after 500 ms");
+  }, 500);
+  client.open("GET", "resources/well-formed.xml");
+  client.send(null);
+});
diff --git a/test/wpt/tests/xhr/event-progress.any.js b/test/wpt/tests/xhr/event-progress.any.js
new file mode 100644
index 00000000000..094d3618117
--- /dev/null
+++ b/test/wpt/tests/xhr/event-progress.any.js
@@ -0,0 +1,18 @@
+// META: title=XMLHttpRequest: The send() method: Fire a progress event named progress (synchronous flag is unset)
+// META: timeout=long
+
+var test = async_test();
+test.step(function () {
+  var client = new XMLHttpRequest();
+  client.onprogress = test.step_func(function (e) {
+    assert_true(e instanceof ProgressEvent);
+    assert_equals(e.type, "progress");
+    test.done();
+  });
+  client.onreadystatechange = test.step_func(function () {
+    if (client.readyState === 4)
+      assert_unreached("onprogress not called.");
+  });
+  client.open("GET", "resources/trickle.py?count=4&delay=150");
+  client.send(null);
+});
diff --git a/test/wpt/tests/xhr/event-readystate-sync-open.any.js b/test/wpt/tests/xhr/event-readystate-sync-open.any.js
new file mode 100644
index 00000000000..a8a4fe7f9a1
--- /dev/null
+++ b/test/wpt/tests/xhr/event-readystate-sync-open.any.js
@@ -0,0 +1,23 @@
+// META: title=XMLHttpRequest: open() call fires sync readystate event
+
+const title = "XMLHttpRequest: open() call fires sync readystate event";
+
+test(function () {
+  var client = new XMLHttpRequest()
+  var eventsFired = []
+  client.onreadystatechange = function () {
+    eventsFired.push(client.readyState)
+  }
+  client.open('GET', "...", false)
+  assert_array_equals(eventsFired, [1])
+}, title + ' (sync)');
+
+test(function () {
+  var client = new XMLHttpRequest()
+  var eventsFired = []
+  client.onreadystatechange = function () {
+    eventsFired.push(client.readyState)
+  }
+  client.open('GET', "...", true)
+  assert_array_equals(eventsFired, [1])
+}, title + ' (async)');
diff --git a/test/wpt/tests/xhr/event-readystatechange-loaded.any.js b/test/wpt/tests/xhr/event-readystatechange-loaded.any.js
new file mode 100644
index 00000000000..a33e6f89227
--- /dev/null
+++ b/test/wpt/tests/xhr/event-readystatechange-loaded.any.js
@@ -0,0 +1,23 @@
+// META: title=XMLHttpRequest: the LOADING state change may be emitted multiple times
+
+var test = async_test();
+
+test.step(function () {
+    var client = new XMLHttpRequest();
+    var countedLoading = 0;
+
+    client.onreadystatechange = test.step_func(function () {
+        if (client.readyState === 3) {
+            countedLoading += 1;
+        }
+
+        if (client.readyState === 4) {
+            assert_greater_than(countedLoading, 1, "LOADING state change may be emitted multiple times");
+
+            test.done();
+        }
+    });
+
+    client.open("GET", "resources/trickle.py?count=10"); // default timeout in trickle.py is 1/2 sec, so this request will take 5 seconds to complete
+    client.send(null);
+});
diff --git a/test/wpt/tests/xhr/event-timeout-order.any.js b/test/wpt/tests/xhr/event-timeout-order.any.js
new file mode 100644
index 00000000000..74daff976c7
--- /dev/null
+++ b/test/wpt/tests/xhr/event-timeout-order.any.js
@@ -0,0 +1,21 @@
+// META: title=XMLHttpRequest: event - timeout (order of events)
+// META: script=resources/xmlhttprequest-event-order.js
+
+var test = async_test();
+test.step(function () {
+    var xhr = new XMLHttpRequest();
+    prepare_xhr_for_event_order_test(xhr);
+    xhr.addEventListener("loadend", function () {
+        test.step(function () {
+            assert_xhr_event_order_matches([1, "loadstart(0,0,false)", "upload.loadstart(0,12,true)", 4, "upload.timeout(0,0,false)", "upload.loadend(0,0,false)", "timeout(0,0,false)", "loadend(0,0,false)"]);
+            test.done();
+        });
+    });
+
+    xhr.timeout = 5;
+    xhr.open("POST", "resources/delay.py?ms=20000");
+    xhr.send("Test Message");
+    test.step_timeout(() => {
+        assert_unreached("ontimeout not called.");
+    }, 2000);
+});
diff --git a/test/wpt/tests/xhr/event-timeout.any.js b/test/wpt/tests/xhr/event-timeout.any.js
new file mode 100644
index 00000000000..c73cd1a4854
--- /dev/null
+++ b/test/wpt/tests/xhr/event-timeout.any.js
@@ -0,0 +1,18 @@
+// META: title=XMLHttpRequest: timeout event
+
+var test = async_test();
+test.step(function () {
+  var client = new XMLHttpRequest();
+  client.ontimeout = function () {
+    test.step(function () {
+      assert_equals(client.readyState, 4);
+      test.done();
+    });
+  };
+  client.timeout = 5;
+  client.open("GET", "resources/delay.py?ms=20000");
+  client.send(null);
+  test.step_timeout(() => {
+    assert_unreached("ontimeout not called.");
+  }, 1000);
+});
diff --git a/test/wpt/tests/xhr/event-upload-progress-crossorigin.any.js b/test/wpt/tests/xhr/event-upload-progress-crossorigin.any.js
new file mode 100644
index 00000000000..9f4c44aabe7
--- /dev/null
+++ b/test/wpt/tests/xhr/event-upload-progress-crossorigin.any.js
@@ -0,0 +1,26 @@
+// META: title=XMLHttpRequest: upload progress event for cross-origin requests
+// META: script=/common/get-host-info.sub.js
+
+const remote = get_host_info().HTTP_REMOTE_ORIGIN + "/xhr/resources/corsenabled.py",
+  redirect = "resources/redirect.py?code=307&location=" + remote;
+
+[remote, redirect].forEach(url => {
+  async_test(test => {
+    const client = new XMLHttpRequest();
+    client.upload.onprogress = test.step_func_done()
+    client.onload = test.unreached_func()
+    client.open("POST", url)
+    client.send("On time: " + url)
+  }, "Upload events registered on time (" + url + ")");
+});
+
+[remote, redirect].forEach(url => {
+  async_test(test => {
+    const client = new XMLHttpRequest();
+    client.onload = test.step_func_done();
+    client.open("POST", url);
+    client.send("Too late: " + url);
+    client.upload.onloadstart = test.unreached_func(); // registered too late
+    client.upload.onprogress = test.unreached_func(); // registered too late
+  }, "Upload events registered too late (" + url + ")");
+});
diff --git a/test/wpt/tests/xhr/event-upload-progress.any.js b/test/wpt/tests/xhr/event-upload-progress.any.js
new file mode 100644
index 00000000000..6fe659193b5
--- /dev/null
+++ b/test/wpt/tests/xhr/event-upload-progress.any.js
@@ -0,0 +1,30 @@
+// META: title=XMLHttpRequest: upload progress event
+// META: script=/common/get-host-info.sub.js
+
+const remote = get_host_info().HTTP_REMOTE_ORIGIN + "/xhr/resources/corsenabled.py",
+  redirect = "resources/redirect.py?code=307&location=" + remote;
+
+[remote, redirect].forEach(url => {
+  async_test(test => {
+    const client = new XMLHttpRequest();
+    const data = "On time: " + url;
+    client.upload.onprogress = test.step_func_done(e => {
+      assert_true(e.lengthComputable);
+      assert_equals(e.total, data.length);
+    });
+    client.onload = test.unreached_func();
+    client.open("POST", url);
+    client.send(data);
+  }, "Upload events registered on time (" + url + ")");
+});
+
+[remote, redirect].forEach(url => {
+  async_test(test => {
+    const client = new XMLHttpRequest();
+    client.onload = test.step_func_done();
+    client.open("POST", url);
+    client.send("Too late: " + url);
+    client.upload.onloadstart = test.unreached_func(); // registered too late
+    client.upload.onprogress = test.unreached_func(); // registered too late
+  }, "Upload events registered too late (" + url + ")");
+});
diff --git a/test/wpt/tests/xhr/firing-events-http-content-length.html b/test/wpt/tests/xhr/firing-events-http-content-length.html
new file mode 100644
index 00000000000..4748ce390fc
--- /dev/null
+++ b/test/wpt/tests/xhr/firing-events-http-content-length.html
@@ -0,0 +1,32 @@
+<!doctype html>
+<html>
+  <head>
+    <title>ProgressEvent: firing events for HTTP with Content-Length</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+  </head>
+  <body>
+    <div id="log"></div>
+    <script>
+      async_test(t => {
+        const xhr = new XMLHttpRequest();
+        let progressHappened = false;
+
+        xhr.onprogress = t.step_func(pe => {
+          assert_equals(pe.type, "progress");
+          assert_greater_than_equal(pe.loaded, 0, "loaded");
+          assert_true(pe.lengthComputable, "lengthComputable");
+          assert_equals(pe.total, 1300, "total");
+          progressHappened = true;
+        });
+
+        xhr.onloadend = t.step_func_done(() => {
+          assert_true(progressHappened);
+        });
+
+        xhr.open("GET", "resources/trickle.py?ms=0&count=100&specifylength=1", true);
+        xhr.send(null);
+      });
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/firing-events-http-no-content-length.html b/test/wpt/tests/xhr/firing-events-http-no-content-length.html
new file mode 100644
index 00000000000..ddf7dd800a2
--- /dev/null
+++ b/test/wpt/tests/xhr/firing-events-http-no-content-length.html
@@ -0,0 +1,35 @@
+<!doctype html>
+<html>
+  <head>
+    <title>ProgressEvent: firing events for HTTP with no Content-Length</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+  </head>
+  <body>
+    <div id="log"></div>
+    <script>
+      async_test(t => {
+        const xhr = new XMLHttpRequest();
+        let progressHappened = false;
+
+        xhr.onprogress = t.step_func(pe => {
+          assert_equals(pe.type, "progress");
+          assert_greater_than_equal(pe.loaded, 0, "loaded");
+          assert_false(pe.lengthComputable, "lengthComputable");
+          assert_equals(pe.total, 0, "total");
+          progressHappened = true;
+        });
+
+        // "loadstart", "error", "abort", "load" tests are out of scope.
+        // They SHOULD be tested in each spec that implement ProgressEvent.
+
+        xhr.onloadend = t.step_func_done(() => {
+          assert_true(progressHappened);
+        });
+
+        xhr.open("GET", "resources/trickle.py?ms=0&count=100", true);
+        xhr.send(null);
+      });
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/folder.txt b/test/wpt/tests/xhr/folder.txt
new file mode 100644
index 00000000000..bf1a1fdefa3
--- /dev/null
+++ b/test/wpt/tests/xhr/folder.txt
@@ -0,0 +1 @@
+top
diff --git a/test/wpt/tests/xhr/formdata.html b/test/wpt/tests/xhr/formdata.html
new file mode 100644
index 00000000000..b308916c589
--- /dev/null
+++ b/test/wpt/tests/xhr/formdata.html
@@ -0,0 +1,90 @@
+<!doctype html>
+<html lang=en>
+<meta charset=utf-8>
+<title>XMLHttpRequest: Construct and upload FormData</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/html/semantics/forms/form-submission-0/resources/targetted-form.js"></script>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#interface-formdata" data-tested-assertations="following::P[1]" />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#dom-formdata" data-tested-assertations=".. following::P[1]" />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#dom-formdata-append" data-tested-assertations=".. following::UL[1]/LI[1] following::UL[1]/LI[2] following::UL[1]/LI[3]" />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#dom-XMLHttpRequest-send-FormData" data-tested-assertations="following::DD[1]" />
+<link rel="help" href="https://html.spec.whatwg.org/multipage/form-control-infrastructure.html#constructing-the-form-data-set">
+
+<div id="log"></div>
+<form id="form">
+  <input type="hidden" name="key" value="value">
+</form>
+<script>
+  function do_test (name, fd, expected) {
+    var test = async_test(name);
+    test.step(function() {
+      var client = new XMLHttpRequest();
+      client.onreadystatechange = test.step_func(function () {
+        if (client.readyState !== 4) return;
+        assert_equals(client.responseText, expected);
+        test.done();
+      });
+      client.open("POST", "resources/upload.py");
+      client.send(fd);
+    });
+  }
+
+  function create_formdata () {
+    var fd = new FormData();
+    for (var i = 0; i < arguments.length; i++) {
+      fd.append.apply(fd, arguments[i]);
+    };
+    return fd;
+  }
+
+  do_test("empty formdata", new FormData(), '\n');
+  do_test("formdata with string", create_formdata(['key', 'value']), 'key=value,\n');
+  do_test("formdata with named string", create_formdata(['key', new Blob(['value'], {type: 'text/plain'}), 'kv.txt']), '\nkey=kv.txt:text/plain:5,');
+  do_test("formdata from form", new FormData(document.getElementById('form')), 'key=value,\n');
+
+  do_test("formdata with blob", create_formdata(['key', new Blob(['value'], {type: 'text/x-value'})]), '\nkey=blob:text/x-value:5,');
+  do_test("formdata with named blob", create_formdata(['key', new Blob(['value'], {type: 'text/x-value'}), 'blob.txt']), '\nkey=blob.txt:text/x-value:5,');
+
+  // If 3rd argument is given and 2nd is not a Blob, formdata.append() should throw
+  const append_test = async_test('formdata.append() should throw if value is string and file name is given'); // needs to be async just because the others above are
+  append_test.step(function(){
+    assert_throws_js(TypeError, function(){
+      create_formdata('a', 'b', 'c');
+    });
+  });
+  append_test.done();
+
+  test(() => {
+    let form = populateForm('<input name=n1 value=v1>');
+    let formDataInEvent = null;
+    form.addEventListener('formdata', e => {
+      e.formData.append('h1', 'vh1');
+      formDataInEvent = e.formData;
+    });
+    let formData = new FormData(form);
+    assert_equals(formData.get('h1'), 'vh1');
+    assert_equals(formData.get('n1'), 'v1');
+    assert_not_equals(formData, formDataInEvent,
+                      '"formData" attribute should be different from the ' +
+                      'FromData object created by "new"');
+
+    formDataInEvent.append('later-key', 'later-value');
+    assert_false(formData.has('later-key'));
+  }, 'Newly created FormData contains entries added to "formData" IDL ' +
+     'attribute of FormDataEvent.');
+
+  test(() => {
+    let form = populateForm('<input name=n11 value=v11>');
+    let counter = 0;
+    form.addEventListener('formdata', e => {
+      ++counter;
+      assert_throws_dom('InvalidStateError', () => { new FormData(e.target) });
+    });
+    new FormData(form);
+    assert_equals(counter, 1);
+
+    form.submit();
+    assert_equals(counter, 2);
+  }, '|new FormData()| in formdata event handler should throw');
+</script>
diff --git a/test/wpt/tests/xhr/formdata/append-formelement.html b/test/wpt/tests/xhr/formdata/append-formelement.html
new file mode 100644
index 00000000000..72c81aa808a
--- /dev/null
+++ b/test/wpt/tests/xhr/formdata/append-formelement.html
@@ -0,0 +1,52 @@
+<!doctype html>
+<meta charset="utf-8">
+<title>FormData.append (with form element)
+</title>
+<link rel="help" href="https://xhr.spec.whatwg.org/#dom-formdata-append">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<div id="log"></div>
+<form id="form"></form>
+<script>
+    test(function() {
+        var fd = new FormData(document.getElementById("form"));
+        fd.append('key', 'value1');
+        assert_equals(fd.get('key'), "value1");
+    }, 'testFormDataAppendToForm1');
+    test(function() {
+        var fd = new FormData(document.getElementById("form"));
+        fd.append('key', 'value2');
+        fd.append('key', 'value1');
+        assert_equals(fd.get('key'), "value2");
+    }, 'testFormDataAppendToForm2');
+    test(function() {
+        var fd = new FormData(document.getElementById("form"));
+        fd.append('key', undefined);
+        assert_equals(fd.get('key'), "undefined");
+    }, 'testFormDataAppendToFormUndefined1');
+    test(function() {
+        var fd = new FormData(document.getElementById("form"));
+        fd.append('key', undefined);
+        fd.append('key', 'value1');
+        assert_equals(fd.get('key'), "undefined");
+    }, 'testFormDataAppendToFormUndefined2');
+    test(function() {
+        var fd = new FormData(document.getElementById("form"));
+        fd.append('key', null);
+        assert_equals(fd.get('key'), "null");
+    }, 'testFormDataAppendToFormNull1');
+    test(function() {
+        var fd = new FormData(document.getElementById("form"));
+        fd.append('key', null);
+        fd.append('key', 'value1');
+        assert_equals(fd.get('key'), "null");
+    }, 'testFormDataAppendToFormNull2');
+    test(function() {
+        var fd = new FormData(document.getElementById("form"));
+        assert_throws_js(TypeError, () => {fd.append('name', "string", 'filename')});
+    }, 'testFormDataAppendToFormString');
+    test(function() {
+        var fd = new FormData(document.getElementById("form"));
+        assert_throws_js(TypeError, () => {fd.append('name', new URLSearchParams(), 'filename')});
+    }, 'testFormDataAppendToFormWrongPlatformObject');
+</script>
diff --git a/test/wpt/tests/xhr/formdata/constructor-formelement.html b/test/wpt/tests/xhr/formdata/constructor-formelement.html
new file mode 100644
index 00000000000..813e1d2a6c0
--- /dev/null
+++ b/test/wpt/tests/xhr/formdata/constructor-formelement.html
@@ -0,0 +1,150 @@
+<!DOCTYPE html>
+<title>FormData: constructor (with form element)</title>
+<link rel="author" title="Domenic Denicola" href="mailto:d@domenic.me">
+<link rel="help" href="https://xhr.spec.whatwg.org/#dom-formdata">
+<link rel="help" href="https://html.spec.whatwg.org/multipage/#constructing-form-data-set">
+
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+
+<form>
+  <output name="do-not-submit-me-1"></output>
+
+  <datalist>
+    <input type="text" name="do-not-submit-me-2" value="bad">
+    <select name="do-not-submit-me-3">
+      <option value="bad" selected></option>
+    </select>
+    <input type="checkbox" name="do-not-submit-me-4" checked>
+  </datalist>
+
+  <input type="text" name="do-not-submit-me-5" disabled value="bad">
+  <fieldset disabled>
+    <input type="text" name="do-not-submit-me-6" value="bad">
+  </fieldset>
+
+  <button name="do-not-submit-me-7">bad</button>
+  <input type="submit" name="do-not-submit-me-8" value="bad">
+  <input type="reset" name="do-not-submit-me-9" value="bad">
+  <input type="image" name="do-not-submit-me-10" value="bad">
+
+  <input type="checkbox" name="do-not-submit-me-11">
+  <input type="radio" name="do-not-submit-me-12">
+
+  <input type="text" value="do-not-submit-me-13">
+  <input type="text" name="" value="do-not-submit-me-14">
+
+  <object name="do-not-submit-me-15"></object>
+
+  <select name="select-1">
+    <option disabled value="do-not-submit-me-16"></option>
+    <option value="do-not-submit-me-17"></option>
+    <option disabled value="do-not-submit-me-18" selected></option>
+  </select>
+
+  <select name="select-2">
+    <option value="do-not-submit-me-19"></option>
+    <option value="submit-me-1" selected></option>
+  </select>
+
+  <select name="select-3" multiple>
+    <option value="do-not-submit-me-20"></option>
+    <option value="submit-me-2" selected></option>
+    <option value="do-not-submit-me-21"></option>
+    <option value="submit-me-3" selected></option>
+  </select>
+
+  <input type="checkbox" name="submit-me-4" value="checkbox-1" checked>
+  <input type="checkbox" name="submit-me-5" checked>
+
+  <input type="radio" name="submit-me-6" value="radio-1" checked>
+  <input type="radio" name="submit-me-7" checked>
+
+  <!-- not tested: <input type="file"> with selected files -->
+
+  <input type="file" name="file-1">
+
+  <!-- not tested: <object>s that allow form submission -->
+
+  <input type="text" name="submit-me-8" value="text-1">
+  <input type="text" name="submit-me-8" value="text-2">
+  <input type="search" name="submit-me-9" value="search-1">
+  <input type="url" name="submit-me-10" value="url-1">
+  <input type="hidden" name="submit-me-11" value="hidden-1">
+  <input type="password" name="submit-me-12" value="password-1">
+  <input type="number" name="submit-me-13" value="11">
+  <input type="range" name="submit-me-14" value="11">
+  <input type="color" name="submit-me-15" value="#123456">
+
+  <textarea name="submit-me-16">textarea value
+with linebreaks set to LF</textarea>
+
+  <!-- this generates two form data entries! -->
+  <input type="text" name="dirname-is-special" dirname="submit-me-17" value="dirname-value">
+
+  <input type="text" name="submit-me-21">
+</form>
+
+<script>
+"use strict";
+
+test(() => {
+
+  const form = document.querySelector("form");
+
+  const input = document.createElement("input");
+  input.name = "submit-me-18-\uDC01";
+  input.value = "value-\uDC01";
+  assert_equals(input.name, "submit-me-18-\uDC01", "input.name accepts unpaired surrogates");
+  assert_equals(input.value, "value-\uDC01", "input.value accepts unpaired surrogates");
+  form.appendChild(input);
+
+  const input2 = document.createElement("input");
+  input2.name = "submit-me-\r19\n";
+  input2.value = "value\n\r";
+  assert_equals(input2.name, "submit-me-\r19\n", "input.name accepts \\r and \\n");
+  assert_equals(input2.value, "value", "input.value when type=text should not contain newlines");
+  form.appendChild(input2);
+
+  const formData = new FormData(form);
+
+  const expected = [
+    ["select-2", "submit-me-1"],
+    ["select-3", ["submit-me-2", "submit-me-3"]],
+    ["submit-me-4", "checkbox-1"],
+    ["submit-me-5", "on"],
+    ["submit-me-6", "radio-1"],
+    ["submit-me-7", "on"],
+    ["submit-me-8", ["text-1", "text-2"]],
+    ["submit-me-9", "search-1"],
+    ["submit-me-10", "url-1"],
+    ["submit-me-11", "hidden-1"],
+    ["submit-me-12", "password-1"],
+    ["submit-me-13", "11"],
+    ["submit-me-14", "11"],
+    ["submit-me-15", "#123456"],
+    ["submit-me-16", "textarea value\nwith linebreaks set to LF"],
+    ["dirname-is-special", "dirname-value"],
+    ["submit-me-17", "ltr"],
+    ["submit-me-18-\uFFFD", "value-\uFFFD"],
+    ["submit-me-\r19\n", "value"],
+    ["submit-me-21", ""]
+  ];
+
+  for (const t of expected) {
+    const field = t[0];
+    const valueOrValues = t[1];
+    const values = Array.isArray(valueOrValues) ? valueOrValues : [valueOrValues];
+    assert_array_equals(formData.getAll(field), values, field);
+  }
+
+  const fileEntry = formData.getAll("file-1");
+  assert_equals(fileEntry.length, 1);
+  assert_equals(fileEntry[0], formData.get("file-1"));
+  assert_equals(fileEntry[0].constructor, File);
+  assert_equals(fileEntry[0].size, 0);
+  assert_equals(fileEntry[0].name, "");
+  assert_equals(fileEntry[0].type, "application/octet-stream");
+
+}, "test that FormData is correctly constructed from the form data set");
+</script>
diff --git a/test/wpt/tests/xhr/formdata/constructor-submitter.html b/test/wpt/tests/xhr/formdata/constructor-submitter.html
new file mode 100644
index 00000000000..542357df34d
--- /dev/null
+++ b/test/wpt/tests/xhr/formdata/constructor-submitter.html
@@ -0,0 +1,100 @@
+<!DOCTYPE html>
+<meta charset='utf-8'>
+<link rel='help' href='https://html.spec.whatwg.org/multipage/form-control-infrastructure.html#constructing-the-form-data-set'>
+<link ref='help' href='https://xhr.spec.whatwg.org/#dom-formdata'>
+<script src='/resources/testharness.js'></script>
+<script src='/resources/testharnessreport.js'></script>
+
+<button name=outerNamed value=GO form='myform'></button>
+<form id='myform' onsubmit='return false'>
+  <input name=n1 value=v1>
+  <button name=named value=GO></button>
+  <button id=unnamed value=unnamed></button>
+  <button form="another" name=unassociated value=unassociated></button>
+  <input type=image name=namedImage src='/media/1x1-green.png'></button>
+  <input type=image id=unnamedImage src='/media/1x1-green.png'></button>
+  <input type=image name=unactivatedImage src='/media/1x1-green.png'></button>
+  <input name=n3 value=v3>
+</form>
+
+<form id='another'>
+  <button name=unassociated2 value=unassociated></button>
+</form>
+
+<script>
+function assertFormDataEntries(formData, expectedEntries) {
+  const expectedEntryNames = expectedEntries.map((entry) => entry[0]);
+  const actualEntries = [...formData.entries()];
+  const actualEntryNames = actualEntries.map((entry) => entry[0]);
+  assert_array_equals(actualEntryNames, expectedEntryNames);
+  for (let i = 0; i < actualEntries.length; i++) {
+    assert_array_equals(actualEntries[i], expectedEntries[i]);
+  }
+}
+
+const form = document.querySelector('#myform');
+
+test(() => {
+  assertFormDataEntries(
+    new FormData(form, null),
+    [['n1', 'v1'], ['n3', 'v3']]
+  );
+}, 'FormData construction should allow a null submitter'); // the use case here is so web developers can avoid null checks, e.g. `new FormData(e.target, e.submitter)`
+
+test(() => {
+  assertFormDataEntries(new FormData(undefined, undefined), []);
+}, 'FormData construction should allow an undefined form and an undefined submitter');
+
+test(() => {
+  assertFormDataEntries(new FormData(undefined, null), []);
+}, 'FormData construction should allow an undefined form and a null submitter');
+
+test(() => {
+  assert_throws_js(TypeError, () => new FormData(form, document.querySelector('[name=n1]')));
+}, 'FormData construction should throw a TypeError if a non-null submitter is not a submit button');
+
+test(() => {
+  assert_throws_dom('NotFoundError', () => new FormData(form, document.querySelector('[name=unassociated]')));
+  assert_throws_dom('NotFoundError', () => new FormData(form, document.querySelector('[name=unassociated2]')));
+}, "FormData construction should throw a 'NotFoundError' DOMException if a non-null submitter is not owned by the form");
+
+test(() => {
+  assertFormDataEntries(
+    new FormData(form, document.querySelector('[name=named]')),
+    [['n1', 'v1'], ['named', 'GO'], ['n3', 'v3']]
+  );
+  assertFormDataEntries(
+    new FormData(form, document.querySelector('[name=outerNamed]')),
+    [['outerNamed', 'GO'], ['n1', 'v1'], ['n3', 'v3']]
+  );
+}, 'The constructed FormData object should contain an in-tree-order entry for a named submit button submitter');
+
+test(() => {
+  assertFormDataEntries(
+    new FormData(form, document.querySelector('#unnamed')),
+    [['n1', 'v1'], ['n3', 'v3']]
+  );
+}, 'The constructed FormData object should not contain an entry for an unnamed submit button submitter');
+
+test(() => {
+  const submitter1 = document.querySelector('[name=namedImage]');
+  submitter1.click();
+  const submitter2 = document.querySelector('#unnamedImage');
+  submitter2.click();
+  assertFormDataEntries(
+    new FormData(form, submitter1),
+    [['n1', 'v1'], ['namedImage.x', '0'], ['namedImage.y', '0'], ['n3', 'v3']]
+  );
+  assertFormDataEntries(
+    new FormData(form, submitter2),
+    [['n1', 'v1'], ['x', '0'], ['y', '0'], ['n3', 'v3']]
+  );
+}, 'The constructed FormData object should contain in-tree-order entries for an activated Image Button submitter');
+
+test(() => {
+  assertFormDataEntries(
+    new FormData(form, document.querySelector('[name=unactivatedImage]')),
+    [['n1', 'v1'], ['unactivatedImage.x', '0'], ['unactivatedImage.y', '0'], ['n3', 'v3']]
+  );
+}, 'The constructed FormData object should contain in-tree-order entries for an unactivated Image Button submitter');
+</script>
diff --git a/test/wpt/tests/xhr/formdata/delete-formelement.html b/test/wpt/tests/xhr/formdata/delete-formelement.html
new file mode 100644
index 00000000000..62862bd571b
--- /dev/null
+++ b/test/wpt/tests/xhr/formdata/delete-formelement.html
@@ -0,0 +1,41 @@
+<!doctype html>
+<html lang=en>
+<meta charset=utf-8>
+<title>FormData: delete (with form element)</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#dom-formdata-get" />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#dom-formdata-getall" />
+<div id="log"></div>
+<form id="form1">
+    <input type="hidden" name="key" value="value1">
+    <input type="hidden" name="key" value="value2">
+</form>
+<form id="form2">
+    <input type="hidden" name="key1" value="value1">
+    <input type="hidden" name="key2" value="value2">
+</form>
+<form id="empty-form"></form>
+<script>
+    test(function() {
+        var fd = new FormData(document.getElementById('form1'));
+        fd.delete('key');
+        assert_equals(fd.get('key'), null);
+    }, 'testFormDataDeleteFromForm');
+    test(function() {
+        var fd = new FormData(document.getElementById('form1'));
+        fd.delete('nil');
+        assert_equals(fd.get('key'), 'value1');
+    }, 'testFormDataDeleteFromFormNonExistentKey');
+    test(function() {
+        var fd = new FormData(document.getElementById('form2'));
+        fd.delete('key1');
+        assert_equals(fd.get('key1'), null);
+        assert_equals(fd.get('key2'), 'value2');
+    }, 'testFormDataDeleteFromFormOtherKey');
+    test(function() {
+        var fd = new FormData(document.getElementById('empty-form'));
+        fd.delete('key');
+        assert_equals(fd.get('key'), null);
+    }, 'testFormDataDeleteFromEmptyForm');
+</script>
diff --git a/test/wpt/tests/xhr/formdata/get-formelement.html b/test/wpt/tests/xhr/formdata/get-formelement.html
new file mode 100644
index 00000000000..801db6c6f64
--- /dev/null
+++ b/test/wpt/tests/xhr/formdata/get-formelement.html
@@ -0,0 +1,34 @@
+<!doctype html>
+<html lang=en>
+<meta charset=utf-8>
+<title>FormData: get and getAll (with form element)</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#dom-formdata-get" />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#dom-formdata-getall" />
+<div id="log"></div>
+<form id="form">
+    <input type="hidden" name="key" value="value1">
+    <input type="hidden" name="key" value="value2">
+</form>
+<form id="empty-form"></form>
+<script>
+    test(function() {
+        assert_equals(new FormData(document.getElementById('form')).get('key'), "value1");
+    }, 'testFormDataGetFromForm');
+    test(function() {
+        assert_equals(new FormData(document.getElementById('form')).get('nil'), null);
+    }, 'testFormDataGetFromFormNull');
+    test(function() {
+        assert_equals(new FormData(document.getElementById('empty-form')).get('key'), null);
+    }, 'testFormDataGetFromEmptyForm');
+    test(function() {
+        assert_array_equals(new FormData(document.getElementById('form')).getAll('key'), ["value1", "value2"]);
+    }, 'testFormDataGetAllFromForm');
+    test(function() {
+        assert_array_equals(new FormData(document.getElementById('form')).getAll('nil'), []);
+    }, 'testFormDataGetAllFromFormNull');
+    test(function() {
+        assert_array_equals(new FormData(document.getElementById('empty-form')).getAll('key'), []);
+    }, 'testFormDataGetAllFromEmptyForm');
+</script>
diff --git a/test/wpt/tests/xhr/formdata/has-formelement.html b/test/wpt/tests/xhr/formdata/has-formelement.html
new file mode 100644
index 00000000000..9edbad36650
--- /dev/null
+++ b/test/wpt/tests/xhr/formdata/has-formelement.html
@@ -0,0 +1,25 @@
+<!doctype html>
+<html lang=en>
+<meta charset=utf-8>
+<title>FormData: has (with form element)</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#dom-formdata-get" />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#dom-formdata-getall" />
+<div id="log"></div>
+<form id="form">
+    <input type="hidden" name="key" value="value1">
+    <input type="hidden" name="key" value="value2">
+</form>
+<form id="empty-form"></form>
+<script>
+    test(function() {
+        assert_equals(new FormData(document.getElementById('form')).has('key'), true);
+    }, 'testFormDataHasFromForm');
+    test(function() {
+        assert_equals(new FormData(document.getElementById('form')).has('nil'), false);
+    }, 'testFormDataHasFromFormNull');
+    test(function() {
+        assert_equals(new FormData(document.getElementById('empty-form')).has('key'), false);
+    }, 'testFormDataHasFromEmptyForm');
+</script>
diff --git a/test/wpt/tests/xhr/formdata/iteration.any.js b/test/wpt/tests/xhr/formdata/iteration.any.js
new file mode 100644
index 00000000000..1633fd9c4da
--- /dev/null
+++ b/test/wpt/tests/xhr/formdata/iteration.any.js
@@ -0,0 +1,65 @@
+// META: title=FormData: changes to entry list during iteration
+
+// These are tests for next()'s behavior as specified in
+// https://webidl.spec.whatwg.org/#es-iterator-prototype-object
+
+"use strict";
+
+function createFormData(input) {
+    const formData = new FormData();
+
+    for (const [name, value] of input) {
+        formData.append(name, value);
+    }
+
+    return formData;
+}
+
+test(() => {
+    const formData = createFormData([["foo", "0"],
+                                     ["baz", "1"],
+                                     ["BAR", "2"]]);
+    const actualKeys = [];
+    const actualValues = [];
+    for (const [name, value] of formData) {
+        actualKeys.push(name);
+        actualValues.push(value);
+        formData.delete("baz");
+    }
+    assert_array_equals(actualKeys, ["foo", "BAR"]);
+    assert_array_equals(actualValues, ["0", "2"]);
+}, "Iteration skips elements removed while iterating");
+
+test(() => {
+    const formData = createFormData([["foo", "0"],
+                                     ["baz", "1"],
+                                     ["BAR", "2"],
+                                     ["quux", "3"]]);
+    const actualKeys = [];
+    const actualValues = [];
+    for (const [name, value] of formData) {
+        actualKeys.push(name);
+        actualValues.push(value);
+        if (name === "baz")
+            formData.delete("foo");
+    }
+    assert_array_equals(actualKeys, ["foo", "baz", "quux"]);
+    assert_array_equals(actualValues, ["0", "1", "3"]);
+}, "Removing elements already iterated over causes an element to be skipped during iteration");
+
+test(() => {
+    const formData = createFormData([["foo", "0"],
+                                     ["baz", "1"],
+                                     ["BAR", "2"],
+                                     ["quux", "3"]]);
+    const actualKeys = [];
+    const actualValues = [];
+    for (const [name, value] of formData) {
+        actualKeys.push(name);
+        actualValues.push(value);
+        if (name === "baz")
+            formData.append("X-yZ", "4");
+    }
+    assert_array_equals(actualKeys, ["foo", "baz", "BAR", "quux", "X-yZ"]);
+    assert_array_equals(actualValues, ["0", "1", "2", "3", "4"]);
+}, "Appending a value pair during iteration causes it to be reached during iteration");
diff --git a/test/wpt/tests/xhr/formdata/set-blob.any.js b/test/wpt/tests/xhr/formdata/set-blob.any.js
index 1418a3775e6..01946faeab2 100644
--- a/test/wpt/tests/xhr/formdata/set-blob.any.js
+++ b/test/wpt/tests/xhr/formdata/set-blob.any.js
@@ -5,17 +5,22 @@
 const formData = new FormData();
 
 test(() => {
-  formData.set("blob-1", new Blob());
+  const value = new Blob();
+  formData.set("blob-1", value);
   const blob1 = formData.get("blob-1");
+  assert_not_equals(blob1, value);
   assert_equals(blob1.constructor.name, "File");
   assert_equals(blob1.name, "blob");
   assert_equals(blob1.type, "");
+  assert_equals(formData.get("blob-1") === formData.get("blob-1"), true, "should return the same value when get the same blob entry from FormData");
   assert_less_than(Math.abs(blob1.lastModified - Date.now()), 200, "lastModified should be now");
 }, "blob without type");
 
 test(() => {
-  formData.set("blob-2", new Blob([], { type: "text/plain" }));
+  const value = new Blob([], { type: "text/plain" });
+  formData.set("blob-2", value);
   const blob2 = formData.get("blob-2");
+  assert_not_equals(blob2, value);
   assert_equals(blob2.constructor.name, "File");
   assert_equals(blob2.name, "blob");
   assert_equals(blob2.type, "text/plain");
@@ -23,8 +28,10 @@ test(() => {
 }, "blob with type");
 
 test(() => {
-  formData.set("blob-3", new Blob(), "custom name");
+  const value = new Blob();
+  formData.set("blob-3", value, "custom name");
   const blob3 = formData.get("blob-3");
+  assert_not_equals(blob3, value);
   assert_equals(blob3.constructor.name, "File");
   assert_equals(blob3.name, "custom name");
   assert_equals(blob3.type, "");
@@ -32,8 +39,10 @@ test(() => {
 }, "blob with custom name");
 
 test(() => {
-  formData.set("file-1", new File([], "name"));
+  const value = new File([], "name");
+  formData.set("file-1", value);
   const file1 = formData.get("file-1");
+  assert_equals(file1, value);
   assert_equals(file1.constructor.name, "File");
   assert_equals(file1.name, "name");
   assert_equals(file1.type, "");
@@ -41,8 +50,10 @@ test(() => {
 }, "file without lastModified or custom name");
 
 test(() => {
-  formData.set("file-2", new File([], "name", { lastModified: 123 }), "custom name");
+  const value = new File([], "name", { lastModified: 123 });
+  formData.set("file-2", value, "custom name");
   const file2 = formData.get("file-2");
+  assert_not_equals(file2, value);
   assert_equals(file2.constructor.name, "File");
   assert_equals(file2.name, "custom name");
   assert_equals(file2.type, "");
diff --git a/test/wpt/tests/xhr/formdata/set-formelement.html b/test/wpt/tests/xhr/formdata/set-formelement.html
new file mode 100644
index 00000000000..d3213f85792
--- /dev/null
+++ b/test/wpt/tests/xhr/formdata/set-formelement.html
@@ -0,0 +1,51 @@
+<!doctype html>
+<meta charset="utf-8">
+<title>FormData: set (with form element)</title>
+<link rel="help" href="https://xhr.spec.whatwg.org/#dom-formdata-set">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<div id="log"></div>
+<form id="form"></form>
+<script>
+    test(function() {
+        var fd = new FormData(document.getElementById("form"));
+        fd.set('key', 'value1');
+        assert_equals(fd.get('key'), "value1");
+    }, 'testFormDataSetToForm1');
+    test(function() {
+        var fd = new FormData(document.getElementById("form"));
+        fd.set('key', 'value2');
+        fd.set('key', 'value1');
+        assert_equals(fd.get('key'), "value1");
+    }, 'testFormDataSetToForm2');
+    test(function() {
+        var fd = new FormData(document.getElementById("form"));
+        fd.set('key', undefined);
+        assert_equals(fd.get('key'), "undefined");
+    }, 'testFormDataSetToFormUndefined1');
+    test(function() {
+        var fd = new FormData(document.getElementById("form"));
+        fd.set('key', undefined);
+        fd.set('key', 'value1');
+        assert_equals(fd.get('key'), "value1");
+    }, 'testFormDataSetToFormUndefined2');
+    test(function() {
+        var fd = new FormData(document.getElementById("form"));
+        fd.set('key', null);
+        assert_equals(fd.get('key'), "null");
+    }, 'testFormDataSetToFormNull1');
+    test(function() {
+        var fd = new FormData(document.getElementById("form"));
+        fd.set('key', null);
+        fd.set('key', 'value1');
+        assert_equals(fd.get('key'), "value1");
+    }, 'testFormDataSetToFormNull2');
+    test(function() {
+        var fd = new FormData(document.getElementById("form"));
+        assert_throws_js(TypeError, () => {fd.set('name', "string", 'filename')});
+    }, 'testFormDataSetToFormString');
+    test(function() {
+        var fd = new FormData(document.getElementById("form"));
+        assert_throws_js(TypeError, () => {fd.set('name', new URLSearchParams(), 'filename')});
+    }, 'testFormDataSetToFormWrongPlatformObject');
+</script>
diff --git a/test/wpt/tests/xhr/getallresponseheaders-cookies.htm b/test/wpt/tests/xhr/getallresponseheaders-cookies.htm
new file mode 100644
index 00000000000..2cd80981859
--- /dev/null
+++ b/test/wpt/tests/xhr/getallresponseheaders-cookies.htm
@@ -0,0 +1,38 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>XMLHttpRequest: getAllResponseHeaders() excludes cookies</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#dom-xmlhttprequest-getallresponseheaders" data-tested-assertations="/following::OL[1]/LI[1] /following::OL[1]/LI[3]" />
+  </head>
+  <body>
+    <div id="log"></div>
+    <script>
+      var test = async_test()
+      test.step(function() {
+        var client = new XMLHttpRequest()
+        assert_equals(client.getAllResponseHeaders(), "")
+        client.onreadystatechange = function() {
+          test.step(function() {
+            var headers = client.getAllResponseHeaders().toLowerCase()
+            if(client.readyState == 1) {
+              assert_equals(headers, "")
+            }
+            if(client.readyState > 1) {
+              assert_true(headers.indexOf("\r\n") != -1, "carriage return")
+              assert_true(headers.indexOf("content-type") != -1, "content-type")
+              assert_true(headers.indexOf("x-custom-header") != -1, "x-custom-header")
+              assert_false(headers.indexOf("set-cookie") != -1, "set-cookie")
+              assert_false(headers.indexOf("set-cookie2") != -1, "set-cookie2")
+            }
+            if(client.readyState == 4)
+              test.done()
+          })
+        }
+        client.open("GET", "resources/headers.py")
+        client.send(null)
+      })
+  </script>
+ </body>
+</html>
diff --git a/test/wpt/tests/xhr/getallresponseheaders-status.htm b/test/wpt/tests/xhr/getallresponseheaders-status.htm
new file mode 100644
index 00000000000..a02ab457452
--- /dev/null
+++ b/test/wpt/tests/xhr/getallresponseheaders-status.htm
@@ -0,0 +1,33 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>XMLHttpRequest: getAllResponseHeaders() excludes status</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#dom-xmlhttprequest-getallresponseheaders" data-tested-assertations="/following::OL[1]/LI[1] /following::OL[1]/LI[3]" />
+  </head>
+  <body>
+    <div id="log"></div>
+    <script>
+      async_test(function() {
+        var client = new XMLHttpRequest()
+        assert_equals(client.getAllResponseHeaders(), "")
+
+        client.onreadystatechange = this.step_func(function() {
+          var headers = client.getAllResponseHeaders().toLowerCase()
+          if(client.readyState == 1) {
+            assert_equals(headers, "")
+          }
+          if(client.readyState > 1) {
+            assert_false(headers.indexOf("200 ok") != -1)
+            assert_false(headers.indexOf("http/1.") != -1)
+          }
+          if(client.readyState == 4)
+            this.done()
+        })
+        client.open("GET", "resources/headers.py")
+        client.send(null)
+      })
+  </script>
+ </body>
+</html>
diff --git a/test/wpt/tests/xhr/getallresponseheaders.htm b/test/wpt/tests/xhr/getallresponseheaders.htm
new file mode 100644
index 00000000000..759d6b68a1f
--- /dev/null
+++ b/test/wpt/tests/xhr/getallresponseheaders.htm
@@ -0,0 +1,35 @@
+<!doctype html>
+<title>XMLHttpRequest: getAllResponseHeaders()</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<div id="log"></div>
+<script>
+async_test((t) => {
+  const client = new XMLHttpRequest()
+  client.onload = t.step_func_done(() => {
+    assert_equals(client.getAllResponseHeaders(), "also-here: Mr. PB\r\newok: lego\r\nfoo-test: 1, 2\r\n__custom: token\r\n")
+  })
+  client.onerror = t.unreached_func("unexpected error")
+  client.open("GET", "resources/headers.asis")
+  client.send(null)
+});
+
+[
+  ["content-length", "0", "header-content-length"],
+  ["content-length", "0, 0", "header-content-length-twice"],
+  ["double-trouble", ", ", "headers-double-empty"],
+  ["foo-test", "1, 2, 3", "headers-basic"],
+  ["heya", ", \u000B\u000C, 1, , , 2", "headers-some-are-empty"],
+  ["www-authenticate", "1, 2, 3, 4", "headers-www-authenticate"],
+].forEach(testValues => {
+  async_test(t => {
+    const client = new XMLHttpRequest();
+    client.onload = t.step_func_done(() => {
+      assert_equals(client.getAllResponseHeaders(), testValues[0] + ": " + testValues[1] + "\r\n");
+    });
+    client.onerror = t.unreached_func("unexpected error");
+    client.open("GET", "resources/" + testValues[2] + ".asis");
+    client.send();
+  });
+});
+</script>
diff --git a/test/wpt/tests/xhr/getresponseheader-case-insensitive.htm b/test/wpt/tests/xhr/getresponseheader-case-insensitive.htm
new file mode 100644
index 00000000000..6a961493574
--- /dev/null
+++ b/test/wpt/tests/xhr/getresponseheader-case-insensitive.htm
@@ -0,0 +1,34 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>XMLHttpRequest: getResponseHeader() case-insensitive matching</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#dom-xmlhttprequest-getresponseheader">
+  </head>
+  <body>
+    <div id="log"></div>
+    <script>
+      var test = async_test()
+      test.step(function() {
+        var client = new XMLHttpRequest()
+        client.onreadystatechange = function() {
+          test.step(function() {
+            if(client.readyState == 4) {
+              assert_equals(client.getResponseHeader("x-custom-header"), "test")
+              assert_equals(client.getResponseHeader("X-Custom-Header"), "test")
+              assert_equals(client.getResponseHeader("X-CUSTOM-HEADER"), "test")
+              assert_equals(client.getResponseHeader("X-custom-HEADER"), "test")
+              assert_equals(client.getResponseHeader("X-CUSTOM-header-COMMA"), "1, 2")
+              assert_equals(client.getResponseHeader("X-CUSTOM-no-such-header-in-response"), null)
+              assert_equals(client.getResponseHeader("CONTENT-TYPE"), "text/plain")
+              test.done()
+            }
+          })
+        }
+        client.open("GET", "resources/headers.py")
+        client.send(null)
+      })
+  </script>
+ </body>
+</html>
diff --git a/test/wpt/tests/xhr/getresponseheader-chunked-trailer.htm b/test/wpt/tests/xhr/getresponseheader-chunked-trailer.htm
new file mode 100644
index 00000000000..0659a3a05e2
--- /dev/null
+++ b/test/wpt/tests/xhr/getresponseheader-chunked-trailer.htm
@@ -0,0 +1,32 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>XMLHttpRequest: getResponseHeader() and HTTP trailer</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#dom-xmlhttprequest-getresponseheader" data-tested-assertations="/following::OL[1]/LI[4] /following::OL[1]/LI[5] /following::OL[1]/LI[6]" />
+  </head>
+  <body>
+    <div id="log"></div>
+    <script>
+      var test = async_test()
+      test.step(function() {
+        var client = new XMLHttpRequest()
+        client.onreadystatechange = function() {
+          test.step(function() {
+            if(client.readyState == 4) {
+              assert_equals(client.getResponseHeader('Trailer'), 'X-Test-Me')
+              assert_equals(client.getResponseHeader('X-Test-Me'), null)
+              assert_equals(client.getAllResponseHeaders().indexOf('Trailer header value'), -1)
+              assert_regexp_match(client.getAllResponseHeaders(), /trailer:\sX-Test-Me/)
+              assert_equals(client.responseText, "First chunk\r\nSecond chunk\r\nYet another (third) chunk\r\nYet another (fourth) chunk\r\n")
+              test.done()
+            }
+          })
+        }
+        client.open("GET", "resources/chunked.py")
+        client.send(null)
+      })
+  </script>
+ </body>
+</html>
diff --git a/test/wpt/tests/xhr/getresponseheader-cookies-and-more.htm b/test/wpt/tests/xhr/getresponseheader-cookies-and-more.htm
new file mode 100644
index 00000000000..053fe441faf
--- /dev/null
+++ b/test/wpt/tests/xhr/getresponseheader-cookies-and-more.htm
@@ -0,0 +1,36 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>XMLHttpRequest: getResponseHeader() custom/non-existent headers and cookies</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#dom-xmlhttprequest-getresponseheader" data-tested-assertations="following::OL[1]/LI[3] following::OL[1]/LI[5] following::OL[1]/LI[6]" />
+  </head>
+  <body>
+    <div id="log"></div>
+    <script>
+      var test = async_test()
+      test.step(function() {
+        var client = new XMLHttpRequest()
+        client.onreadystatechange = function() {
+          test.step(function() {
+            if(client.readyState == 1) {
+              assert_equals(client.getResponseHeader("x-custom-header"), null)
+            }
+            if(client.readyState > 1) {
+              assert_equals(client.getResponseHeader("x-custom-header"), "test")
+              assert_equals(client.getResponseHeader("x-custom-header-empty"), "")
+              assert_equals(client.getResponseHeader("set-cookie"), null)
+              assert_equals(client.getResponseHeader("set-cookie2"), null)
+              assert_equals(client.getResponseHeader("x-non-existent-header"), null)
+            }
+            if(client.readyState == 4)
+              test.done()
+          })
+        }
+        client.open("GET", "resources/headers.py")
+        client.send(null)
+      })
+  </script>
+ </body>
+</html>
diff --git a/test/wpt/tests/xhr/getresponseheader-error-state.htm b/test/wpt/tests/xhr/getresponseheader-error-state.htm
new file mode 100644
index 00000000000..c9695fdee0f
--- /dev/null
+++ b/test/wpt/tests/xhr/getresponseheader-error-state.htm
@@ -0,0 +1,36 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>XMLHttpRequest: getResponseHeader() in error state (failing cross-origin test)</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#dom-xmlhttprequest-getresponseheader" data-tested-assertations="following::OL[1]/LI[2]" />
+  </head>
+  <body>
+    <div id="log"></div>
+    <script>
+      var test = async_test()
+      test.step(function() {
+
+        var client = new XMLHttpRequest()
+        client.onreadystatechange = function() {
+          test.step(function() {
+            if(client.readyState == 1) {
+              assert_equals(client.getResponseHeader("x-custom-header"), null)
+            }
+            if(client.readyState > 1) {
+              assert_equals(client.getResponseHeader("x-custom-header"), null)
+            }
+            if(client.readyState == 4){
+              assert_equals(client.getResponseHeader("x-custom-header"), null)
+              test.done()
+            }
+          })
+        }
+        var url = location.protocol + "//" + 'www1.' + location.host + (location.pathname.replace(/getresponseheader-error-state\.htm/, 'resources/nocors/folder.txt'))
+        client.open("GET", url)
+        client.send(null)
+      })
+  </script>
+ </body>
+</html>
diff --git a/test/wpt/tests/xhr/getresponseheader-server-date.htm b/test/wpt/tests/xhr/getresponseheader-server-date.htm
new file mode 100644
index 00000000000..409bc350390
--- /dev/null
+++ b/test/wpt/tests/xhr/getresponseheader-server-date.htm
@@ -0,0 +1,29 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>XMLHttpRequest: getResponseHeader() server and date</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#dom-xmlhttprequest-getresponseheader" data-tested-assertations="/following::OL[1]/LI[4] /following::OL[1]/LI[5] /following::OL[1]/LI[6]" />
+  </head>
+  <body>
+    <div id="log"></div>
+    <script>
+      var test = async_test()
+      test.step(function() {
+        var client = new XMLHttpRequest()
+        client.onreadystatechange = function() {
+          test.step(function() {
+            if(client.readyState == 4) {
+              assert_true(client.getResponseHeader("Server") != null)
+              assert_true(client.getResponseHeader("Date") != null)
+              test.done()
+            }
+          })
+        }
+        client.open("GET", "resources/headers.py")
+        client.send(null)
+      })
+  </script>
+ </body>
+</html>
diff --git a/test/wpt/tests/xhr/getresponseheader-special-characters.htm b/test/wpt/tests/xhr/getresponseheader-special-characters.htm
new file mode 100644
index 00000000000..980f8481c7e
--- /dev/null
+++ b/test/wpt/tests/xhr/getresponseheader-special-characters.htm
@@ -0,0 +1,34 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>XMLHttpRequest: getResponseHeader() funny characters</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#dom-xmlhttprequest-getresponseheader" data-tested-assertations="/following::OL[1]/LI[5] /following::OL[1]/LI[6]" />
+  </head>
+  <body>
+    <div id="log"></div>
+    <script>
+      var test = async_test()
+      test.step(function() {
+        var client = new XMLHttpRequest()
+        client.onreadystatechange = function() {
+          test.step(function() {
+            if(client.readyState == 4) {
+              assert_equals(client.getResponseHeader("x-custom-header "), null)
+              assert_equals(client.getResponseHeader(" x-custom-header"), null)
+              assert_equals(client.getResponseHeader("x-custom-header-bytes"), "\xE2\x80\xA6")
+              assert_equals(client.getResponseHeader("x¾"), null)
+              assert_equals(client.getResponseHeader("x-custom-header\n"), null)
+              assert_equals(client.getResponseHeader("\nx-custom-header"), null)
+              assert_equals(client.getResponseHeader("x-custom-header:"), null)
+              test.done()
+            }
+          })
+        }
+        client.open("GET", "resources/headers.py")
+        client.send(null)
+      })
+  </script>
+ </body>
+</html>
diff --git a/test/wpt/tests/xhr/getresponseheader-unsent-opened-state.htm b/test/wpt/tests/xhr/getresponseheader-unsent-opened-state.htm
new file mode 100644
index 00000000000..e3bc2720f12
--- /dev/null
+++ b/test/wpt/tests/xhr/getresponseheader-unsent-opened-state.htm
@@ -0,0 +1,32 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>XMLHttpRequest: getResponseHeader() in unsent, opened states</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#dom-xmlhttprequest-getresponseheader" data-tested-assertations="/following::OL[1]/LI[1]" />
+  </head>
+  <body>
+    <div id="log"></div>
+    <script>
+      var test = async_test()
+      test.step(function() {
+        var client = new XMLHttpRequest()
+        assert_equals(client.getResponseHeader("x-custom-header"), null)
+        client.onreadystatechange = function() {
+          test.step(function() {
+            if(client.readyState < 2) {
+              assert_equals(client.getResponseHeader("x-custom-header"), null)
+              assert_equals(client.getResponseHeader("CONTENT-TYPE"), null)
+              test.done()
+            }
+          })
+        }
+        client.open("GET", "resources/headers.py")
+        assert_equals(client.getResponseHeader("x-custom-header"), null)
+        assert_equals(client.getResponseHeader("Date"), null)
+        client.send(null)
+      })
+  </script>
+ </body>
+</html>
diff --git a/test/wpt/tests/xhr/getresponseheader.any.js b/test/wpt/tests/xhr/getresponseheader.any.js
new file mode 100644
index 00000000000..6eeccd03f62
--- /dev/null
+++ b/test/wpt/tests/xhr/getresponseheader.any.js
@@ -0,0 +1,18 @@
+[
+  ["content-length", "0", "header-content-length"],
+  ["content-length", "0, 0", "header-content-length-twice"],
+  ["double-trouble", ", ", "headers-double-empty"],
+  ["foo-test", "1, 2, 3", "headers-basic"],
+  ["heya", ", \u000B\u000C, 1, , , 2", "headers-some-are-empty"],
+  ["www-authenticate", "1, 2, 3, 4", "headers-www-authenticate"],
+].forEach(testValues => {
+  async_test(t => {
+    const client = new XMLHttpRequest();
+    client.onload = t.step_func_done(() => {
+      assert_equals(client.getResponseHeader(testValues[0]), testValues[1]);
+    });
+    client.onerror = t.unreached_func("unexpected error");
+    client.open("GET", "resources/" + testValues[2] + ".asis");
+    client.send();
+  }, "getResponseHeader('" + testValues[0] + "') expects " + testValues[1]);
+});
diff --git a/test/wpt/tests/xhr/header-user-agent-async.htm b/test/wpt/tests/xhr/header-user-agent-async.htm
new file mode 100644
index 00000000000..8c1d0b663f4
--- /dev/null
+++ b/test/wpt/tests/xhr/header-user-agent-async.htm
@@ -0,0 +1,26 @@
+<!DOCTYPE html>
+<html>
+<head>
+    <title>Test that async requests (both OPTIONS preflight and regular) are sent with the User-Agent header</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <script src="/common/get-host-info.sub.js"></script>
+</head>
+<body>
+<script type="text/javascript">
+  async_test((test) => {
+    let xhr = new XMLHttpRequest;
+    xhr.open("GET", get_host_info().HTTP_REMOTE_ORIGIN + "/xhr/resources/header-user-agent.py");
+    xhr.setRequestHeader("x-test", "foobar");
+
+    xhr.onerror = test.unreached_func("Unexpected error");
+
+    xhr.onload = test.step_func_done(() => {
+      assert_equals(xhr.responseText, "PASS");
+    });
+
+    xhr.send();
+  }, "Async request has User-Agent header");
+</script>
+</body>
+</html>
diff --git a/test/wpt/tests/xhr/header-user-agent-sync.htm b/test/wpt/tests/xhr/header-user-agent-sync.htm
new file mode 100644
index 00000000000..d88aac2805d
--- /dev/null
+++ b/test/wpt/tests/xhr/header-user-agent-sync.htm
@@ -0,0 +1,20 @@
+<!DOCTYPE html>
+<html>
+<head>
+    <title>Test that sync requests (both OPTIONS preflight and regular) are sent with the User-Agent header</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <script src="/common/get-host-info.sub.js"></script>
+</head>
+<body>
+<script type="text/javascript">
+  test(function() {
+    let xhr = new XMLHttpRequest;
+    xhr.open("post", get_host_info().HTTP_REMOTE_ORIGIN + "/xhr/resources/header-user-agent.py", false);
+    xhr.setRequestHeader("x-test", "foobar");
+    xhr.send();
+    assert_equals(xhr.responseText, "PASS");
+  }, "Sync request has User-Agent header");
+</script>
+</body>
+</html>
diff --git a/test/wpt/tests/xhr/headers-normalize-response.htm b/test/wpt/tests/xhr/headers-normalize-response.htm
new file mode 100644
index 00000000000..3d472f688cf
--- /dev/null
+++ b/test/wpt/tests/xhr/headers-normalize-response.htm
@@ -0,0 +1,43 @@
+<!DOCTYPE html>
+<meta charset=utf-8>
+<title>Whitespace and null in header values</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<div id=log></div>
+<script>
+function error(val) {
+  test(() => {
+    const client = new XMLHttpRequest();
+    client.open("GET", "resources/parse-headers.py?my-custom-header="+encodeURIComponent(val), false);
+    assert_throws_dom("NetworkError", () => client.send());
+  }, "Header value: " + val.replace("\0", "\\0"));
+}
+
+function matchHeaderValue(val) {
+    test(function () {
+        var client = new XMLHttpRequest();
+        var trimmed = val.trim();
+        client.open("GET", "resources/parse-headers.py?my-custom-header="+encodeURIComponent(val), false);
+        client.send();
+        var r = client.getResponseHeader("My-Custom-Header");
+
+        assert_equals(r, trimmed);
+    }, "Header value: " + val.replace(/\t/g, "[tab]").replace(/ /g, "_"));
+}
+
+error("hello world\0");
+error("\0hello world");
+error("hello\0world");
+matchHeaderValue("  hello world");
+matchHeaderValue("hello world  ");
+matchHeaderValue("  hello world  ");
+matchHeaderValue("\thello world");
+matchHeaderValue("hello world\t");
+matchHeaderValue("\thello world\t");
+matchHeaderValue("hello      world");
+matchHeaderValue("hello\tworld");
+error("\0");
+matchHeaderValue("   ");
+matchHeaderValue("\t");
+matchHeaderValue("");
+</script>
diff --git a/test/wpt/tests/xhr/historical.html b/test/wpt/tests/xhr/historical.html
new file mode 100644
index 00000000000..4af3da9f54c
--- /dev/null
+++ b/test/wpt/tests/xhr/historical.html
@@ -0,0 +1,15 @@
+<!doctype html>
+<meta charset="utf-8">
+<title>Historical features</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<div id="log"></div>
+<script>
+["moz-blob", "moz-chunked-text", "moz-chunked-arraybuffer"].forEach(function(rt) {
+  test(function() {
+    var xhr = new XMLHttpRequest();
+    xhr.responseType = rt;
+    assert_equals(xhr.responseType, "");
+  }, "Support for responseType = " + rt);
+});
+</script>
diff --git a/test/wpt/tests/xhr/idlharness.any.js b/test/wpt/tests/xhr/idlharness.any.js
new file mode 100644
index 00000000000..2e0e0c89636
--- /dev/null
+++ b/test/wpt/tests/xhr/idlharness.any.js
@@ -0,0 +1,28 @@
+// META: global=window,dedicatedworker,sharedworker
+// META: script=/resources/WebIDLParser.js
+// META: script=/resources/idlharness.js
+// META: timeout=long
+
+idl_test(
+  ['xhr'],
+  ['dom', 'html'],
+  idl_array => {
+    idl_array.add_objects({
+      XMLHttpRequest: ['new XMLHttpRequest()'],
+      XMLHttpRequestUpload: ['(new XMLHttpRequest()).upload'],
+      FormData: ['new FormData()'],
+      ProgressEvent: ['new ProgressEvent("type")'],
+    });
+    if (self.Window) {
+      self.form = document.createElement('form');
+      self.submitter = document.createElement('button');
+      self.form.appendChild(self.submitter);
+      idl_array.add_objects({
+        FormData: [
+          'new FormData(form)',
+          'new FormData(form, submitter)'
+        ],
+      });
+    }
+  }
+);
diff --git a/test/wpt/tests/xhr/json.any.js b/test/wpt/tests/xhr/json.any.js
new file mode 100644
index 00000000000..0f49ff5ab1f
--- /dev/null
+++ b/test/wpt/tests/xhr/json.any.js
@@ -0,0 +1,23 @@
+// See also /fetch/api/response/json.any.js
+
+async_test(t => {
+  const xhr = new XMLHttpRequest();
+  xhr.responseType = "json";
+  xhr.open("GET", `data:,\uFEFF{ "b": 1, "a": 2, "b": 3 }`);
+  xhr.send();
+  xhr.onload = t.step_func_done(() => {
+    assert_array_equals(Object.keys(xhr.response), ["b", "a"]);
+    assert_equals(xhr.response.a, 2);
+    assert_equals(xhr.response.b, 3);
+  });
+}, "Ensure the correct JSON parser is used");
+
+async_test(t => {
+  const client = new XMLHttpRequest();
+  client.responseType = 'json';
+  client.open("GET", "resources/utf16-bom.json");
+  client.send();
+  client.onload = t.step_func_done(() => {
+    assert_equals(client.response, null);
+  });
+}, "Ensure UTF-16 results in an error");
diff --git a/test/wpt/tests/xhr/loadstart-and-state.html b/test/wpt/tests/xhr/loadstart-and-state.html
new file mode 100644
index 00000000000..8b344a58f81
--- /dev/null
+++ b/test/wpt/tests/xhr/loadstart-and-state.html
@@ -0,0 +1,40 @@
+<!doctype html>
+<title>XMLHttpRequest: loadstart event corner cases</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<div id=log></div>
+<script>
+async_test(t => {
+  const client = new XMLHttpRequest
+  client.onloadstart = t.step_func(() => {
+    assert_throws_dom("InvalidStateError", () => client.setRequestHeader("General", "Organa"))
+    assert_throws_dom("InvalidStateError", () => client.withCredentials = true)
+    assert_throws_dom("InvalidStateError", () => client.send())
+    client.onloadstart = null
+    client.open("GET", "data:,BB-8")
+    client.send()
+  })
+  client.onload = t.step_func_done(() => {
+    assert_equals(client.responseText, "BB-8")
+  })
+  client.open("GET", "data:,R2-D2")
+  client.send()
+}, "open() during loadstart")
+
+async_test(t => {
+  const client = new XMLHttpRequest
+  let abortFired = false
+  client.onloadstart = t.step_func_done(() => {
+    assert_equals(client.readyState, 1)
+    client.abort()
+    assert_true(abortFired)
+    assert_equals(client.readyState, 0)
+  })
+  client.onabort = t.step_func(() => {
+    abortFired = true
+    assert_equals(client.readyState, 4)
+  })
+  client.open("GET", "data:,K-2SO")
+  client.send()
+}, "abort() during loadstart")
+</script>
diff --git a/test/wpt/tests/xhr/open-after-abort.htm b/test/wpt/tests/xhr/open-after-abort.htm
new file mode 100644
index 00000000000..c9ef6e7ac94
--- /dev/null
+++ b/test/wpt/tests/xhr/open-after-abort.htm
@@ -0,0 +1,77 @@
+<!doctype html>
+<html>
+  <head>
+    <title>XMLHttpRequest: open() after abort()</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-open()-method" data-tested-assertations="following::ol/li[15] following::ol/li[15]/ol/li[1] following::ol/li[15]/ol/li[2]" />
+  </head>
+  <body>
+    <div id="log"></div>
+    <script>
+      test(function(t) {
+        var client = new XMLHttpRequest(),
+            result = [],
+            expected = [
+              'readystatechange', 0, 1,  // open()
+              'readystatechange', 2, 4,  // abort()
+              'abort',            2, 4,  // abort()
+              'loadend',          2, 4,  // abort()
+              'readystatechange', 3, 1,  // open()
+            ]
+
+        var state = 0
+
+        client.onreadystatechange = t.step_func(function() {
+          result.push('readystatechange', state, client.readyState)
+        })
+        client.onabort = t.step_func(function() {
+          // abort event must be fired synchronously from abort().
+          assert_equals(state, 2)
+
+          // readystatechange should be fired before abort.
+          assert_array_equals(result, [
+            'readystatechange', 0, 1,  // open()
+            'readystatechange', 2, 4,  // abort()
+          ])
+
+          // readyState should be set to unsent (0) at the very end of abort(),
+          // after this (and onloadend) is called.
+          assert_equals(client.readyState, 4)
+
+          result.push('abort', state, client.readyState)
+        })
+        client.onloadend = t.step_func(function() {
+          // abort event must be fired synchronously from abort().
+          assert_equals(state, 2)
+
+          // readystatechange should be fired before abort.
+          assert_array_equals(result, [
+            'readystatechange', 0, 1,  // open()
+            'readystatechange', 2, 4,  // abort()
+            'abort',            2, 4,  // abort()
+          ])
+
+          // readyState should be set to unsent (0) at the very end of abort(),
+          // after this is called.
+          assert_equals(client.readyState, 4)
+
+          result.push('loadend', state, client.readyState)
+        })
+
+        client.open("GET", "resources/well-formed.xml")
+        assert_equals(client.readyState, 1)
+
+        state = 1
+        client.send(null)
+        state = 2
+        client.abort()
+        assert_equals(client.readyState, 0)
+        state = 3
+        client.open("GET", "resources/well-formed.xml")
+        assert_equals(client.readyState, 1)
+        assert_array_equals(result, expected)
+      })
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/open-after-setrequestheader.htm b/test/wpt/tests/xhr/open-after-setrequestheader.htm
new file mode 100644
index 00000000000..ca1ae25946f
--- /dev/null
+++ b/test/wpt/tests/xhr/open-after-setrequestheader.htm
@@ -0,0 +1,33 @@
+<!doctype html>
+<html>
+  <head>
+    <title>XMLHttpRequest: open() after setRequestHeader()</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-open()-method">
+
+  </head>
+  <body>
+    <div id="log"></div>
+    <script>
+      var test = async_test()
+      test.step(function() {
+        var client = new XMLHttpRequest()
+        client.onreadystatechange = function() {
+          test.step(function() {
+            if(client.readyState === 4){
+              assert_equals(client.responseText, '')
+              test.done()
+            }
+          })
+        }
+        client.open("GET", "resources/inspect-headers.py?filter_name=X-foo")
+        assert_equals(client.readyState, 1)
+        client.setRequestHeader('X-foo', 'bar')
+        client.open("GET", "resources/inspect-headers.py?filter_name=X-foo")
+        assert_equals(client.readyState, 1)
+        client.send()
+      })
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/open-after-stop.window.js b/test/wpt/tests/xhr/open-after-stop.window.js
new file mode 100644
index 00000000000..e836a523f86
--- /dev/null
+++ b/test/wpt/tests/xhr/open-after-stop.window.js
@@ -0,0 +1,43 @@
+// window.stop() below prevents the load event from firing, so wait until it is
+// fired to start the test.
+setup({explicit_done: true });
+
+onload = () => {
+  async_test(function(t) {
+    const client = new XMLHttpRequest();
+
+    const result = [];
+    const expected = [
+      'readystatechange', 0, 1,  // open()
+    ];
+
+    let state = 0;
+
+    client.onreadystatechange = t.step_func(() => {
+      result.push('readystatechange', state, client.readyState);
+    });
+    client.onabort = t.unreached_func("abort should not be fired after window.stop() and open()");
+    client.onloadend = t.unreached_func("loadend should not be fired after window.stop() and open()");
+
+    client.open("GET", "resources/well-formed.xml");
+    assert_equals(client.readyState, 1);
+
+    state = 1;
+    client.send(null);
+    state = 2;
+    window.stop();
+    // Unlike client.abort(), window.stop() does not change readyState
+    // immediately, rather through a task...
+    assert_equals(client.readyState, 1);
+    state = 3;
+    // ... which is then canceled when we open a new request anyway.
+    client.open("GET", "resources/well-formed.xml");
+    assert_equals(client.readyState, 1);
+    assert_array_equals(result, expected);
+
+    // Give the abort and loadend events a chance to fire (erroneously) before
+    // calling this a success.
+    t.step_timeout(t.step_func_done(), 1000);
+  }, "open() after window.stop()");
+  done();
+};
diff --git a/test/wpt/tests/xhr/open-during-abort-event.htm b/test/wpt/tests/xhr/open-during-abort-event.htm
new file mode 100644
index 00000000000..22c3be9bc44
--- /dev/null
+++ b/test/wpt/tests/xhr/open-during-abort-event.htm
@@ -0,0 +1,56 @@
+<!doctype html>
+<title>XMLHttpRequest: open() during abort event - abort() called from upload.onloadstart</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<div id="log"></div>
+<script>
+async_test(t => {
+  let client = new XMLHttpRequest(),
+      log = [],
+      lastTest = false,
+      expected = [
+        'readyState before abort() 1',
+        "upload.onabort - before open() 4",
+        "readyState after open() 1",
+        "client.onabort 1",
+        "client.onloadend 1",
+        "readyState after abort() 1",
+        "client.onload 4",
+        "client.onloadend 4"
+      ]
+
+  client.upload.onloadstart = t.step_func(() => {
+    log.push('readyState before abort() '+client.readyState)
+    client.abort()
+    log.push('readyState after abort() '+client.readyState)
+  })
+
+  client.upload.onabort = t.step_func(() => {
+    log.push('upload.onabort - before open() ' + client.readyState)
+    client.open("GET", "resources/content.py")
+    log.push('readyState after open() ' + client.readyState)
+    client.send(null)
+  })
+
+  client.onabort = t.step_func(() => {
+    // happens immediately after all of upload.onabort, so readyState is 1
+    log.push('client.onabort ' + client.readyState)
+  })
+
+  client.onloadend = t.step_func(() => {
+    log.push('client.onloadend ' + client.readyState)
+    if(lastTest) {
+      assert_array_equals(log, expected)
+      t.done()
+    }
+    lastTest = true
+  })
+
+  client.onload = t.step_func(() => {
+    log.push('client.onload ' + client.readyState)
+  })
+
+  client.open("POST", "resources/content.py")
+  client.send("non-empty")
+})
+</script>
diff --git a/test/wpt/tests/xhr/open-during-abort-processing.htm b/test/wpt/tests/xhr/open-during-abort-processing.htm
new file mode 100644
index 00000000000..706eb32a205
--- /dev/null
+++ b/test/wpt/tests/xhr/open-during-abort-processing.htm
@@ -0,0 +1,62 @@
+<!doctype html>
+<title>XMLHttpRequest: open() during abort processing - abort() called from onloadstart</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<div id="log"></div>
+<script>
+async_test(t => {
+  let client = new XMLHttpRequest(),
+      test_state = 1,
+      log = [],
+      expected = [
+        "onloadstart readyState before abort() 1",
+        "onreadystatechange readyState before open() 4",
+        "onreadystatechange readyState after open() 1",
+        "onloadstart readyState 1",
+        "client.onabort 1",
+        "readyState after abort() 1",
+        "client.onload 4"
+      ]
+
+  client.onreadystatechange = t.step_func(() => {
+    if(test_state === 2){
+      test_state = 3
+      log.push('onreadystatechange readyState before open() ' + client.readyState)
+      client.open("GET", "resources/content.py")
+      log.push('onreadystatechange readyState after open() ' + client.readyState)
+      client.send(null)
+    }
+  })
+
+  client.onloadstart = t.step_func(() => {
+    if(test_state === 1){
+      test_state = 2
+      log.push('onloadstart readyState before abort() ' + client.readyState)
+      client.abort()
+      log.push('readyState after abort() ' + client.readyState)
+    }else{
+      log.push('onloadstart readyState ' + client.readyState)
+    }
+  })
+
+  client.upload.onabort = t.step_func(() => {
+    log.push('upload.onabort ' + client.readyState)
+  })
+
+  client.onabort = t.step_func(() => {
+    log.push('client.onabort ' + client.readyState)
+  })
+
+  client.upload.onloadend = t.step_func(() => {
+    log.push('upload.onloadend ' + client.readyState)
+  })
+
+  client.onload = t.step_func_done(() => {
+    log.push('client.onload ' + client.readyState)
+    assert_array_equals(log, expected)
+  })
+
+  client.open("POST", "resources/content.py")
+  client.send('abcd')
+})
+</script>
diff --git a/test/wpt/tests/xhr/open-during-abort.htm b/test/wpt/tests/xhr/open-during-abort.htm
new file mode 100644
index 00000000000..d03ca7afa63
--- /dev/null
+++ b/test/wpt/tests/xhr/open-during-abort.htm
@@ -0,0 +1,33 @@
+<!doctype html>
+<html>
+  <head>
+    <title>XMLHttpRequest: open() during abort()</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+  </head>
+  <body>
+    <div id="log"></div>
+    <script>
+      test(function() {
+        var client = new XMLHttpRequest(),
+            abort_flag = false,
+            result = [],
+            expected = [1, 4, 1] // open() => 1, abort() => 4, open() => 1
+
+        client.onreadystatechange = this.step_func(function() {
+          result.push(client.readyState)
+          if (abort_flag) {
+            abort_flag = false
+            client.open("GET", "...")
+          }
+        })
+        client.open("GET", "resources/well-formed.xml")
+        client.send(null)
+        abort_flag = true
+        client.abort()
+        assert_array_equals(result, expected)
+        assert_equals(client.readyState, 1) // abort() should only set state to UNSENT when DONE
+      })
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/open-method-bogus.htm b/test/wpt/tests/xhr/open-method-bogus.htm
new file mode 100644
index 00000000000..13bb18bf5c4
--- /dev/null
+++ b/test/wpt/tests/xhr/open-method-bogus.htm
@@ -0,0 +1,28 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>XMLHttpRequest: open() - bogus methods</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-open()-method" data-tested-assertations="following::ol[1]/li[4]" />
+  </head>
+  <body>
+    <div id="log"></div>
+    <script>
+      function method(method) {
+        test(function() {
+          var client = new XMLHttpRequest()
+          assert_throws_dom("SyntaxError", function() { client.open(method, "...") })
+        }, document.title + " (" + method + ")")
+      }
+      method("")
+      method(">")
+      method(" GET")
+      method("G T")
+      method("@GET")
+      method("G:ET")
+      method("GET?")
+      method("GET\n")
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/open-method-case-insensitive.htm b/test/wpt/tests/xhr/open-method-case-insensitive.htm
new file mode 100644
index 00000000000..103381745a7
--- /dev/null
+++ b/test/wpt/tests/xhr/open-method-case-insensitive.htm
@@ -0,0 +1,29 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>XMLHttpRequest: open() - case-insensitive methods test</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-open()-method" data-tested-assertations="following::ol/li[5]" />
+
+  </head>
+  <body>
+    <div id="log"></div>
+    <script>
+      function method(method) {
+        test(function() {
+          var client = new XMLHttpRequest()
+          client.open(method, "resources/content.py", false)
+          client.send(null)
+          assert_equals(client.getResponseHeader("x-request-method"), method.toUpperCase())
+        }, document.title + " (" + method.toUpperCase() + ")")
+      }
+      method("deLETE")
+      method("get")
+      method("heAd")
+      method("OpTIOns")
+      method("post")
+      method("Put")
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/open-method-case-sensitive.htm b/test/wpt/tests/xhr/open-method-case-sensitive.htm
new file mode 100644
index 00000000000..270e32d67a3
--- /dev/null
+++ b/test/wpt/tests/xhr/open-method-case-sensitive.htm
@@ -0,0 +1,31 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>XMLHttpRequest: open() - case-sensitive methods test</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-open()-method" data-tested-assertations="following::ol/li[5]" />
+  </head>
+  <body>
+    <div id="log"></div>
+    <script>
+      function method(method) {
+        test(function() {
+          var client = new XMLHttpRequest()
+          client.open(method, "resources/content.py", false)
+          client.send(null)
+          assert_equals(client.getResponseHeader("x-request-method"), method)
+        }, document.title + " (" + method + ")")
+      }
+      method("XUNICORN")
+      method("xUNIcorn")
+      method("chiCKEN")
+      method("PATCH")
+      method("patCH")
+      method("copy")
+      method("COpy")
+      method("inDEX")
+      method("movE")
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/open-method-insecure.htm b/test/wpt/tests/xhr/open-method-insecure.htm
new file mode 100644
index 00000000000..a6bf4422481
--- /dev/null
+++ b/test/wpt/tests/xhr/open-method-insecure.htm
@@ -0,0 +1,29 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>XMLHttpRequest: open() - "insecure" methods</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-open()-method" data-tested-assertations="following::ol/li[5] following::ol/li[6]" />
+  </head>
+  <body>
+    <div id="log"></div>
+    <script>
+      function method(method) {
+        test(function() {
+          var client = new XMLHttpRequest()
+          assert_throws_dom("SecurityError", function() { client.open(method, "...") })
+        }, document.title + " (" + method + ")")
+      }
+      method("track")
+      method("TRACK")
+      method("trAck")
+      method("TRACE")
+      method("trace")
+      method("traCE")
+      method("connect")
+      method("CONNECT")
+      method("connECT")
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/open-method-responsetype-set-sync.htm b/test/wpt/tests/xhr/open-method-responsetype-set-sync.htm
new file mode 100644
index 00000000000..7858c91409e
--- /dev/null
+++ b/test/wpt/tests/xhr/open-method-responsetype-set-sync.htm
@@ -0,0 +1,32 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>XMLHttpRequest: open() sync request not allowed if responseType is set</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-open()-method" data-tested-assertations="following::ol[1]/li[10]" />
+
+  </head>
+  <body>
+    <div id="log"></div>
+    <script>
+      // Note: the case of calling synchronous open() first, and then setting
+      // responseType, is tested in responsetype.html.
+      function request(type) {
+        test(function() {
+          var client = new XMLHttpRequest()
+          client.onreadystatechange = this.step_func(function(){
+            assert_unreached('No events should fire here')
+          })
+          client.responseType = type
+          assert_throws_dom("InvalidAccessError", function() { client.open('GET', "...", false) })
+        }, document.title + " (" + type + ")")
+      }
+      request("arraybuffer")
+      request("blob")
+      request("json")
+      request("text")
+      request("document")
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/open-open-send.htm b/test/wpt/tests/xhr/open-open-send.htm
new file mode 100644
index 00000000000..ebc1801ab53
--- /dev/null
+++ b/test/wpt/tests/xhr/open-open-send.htm
@@ -0,0 +1,33 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>XMLHttpRequest: open() - open() - send()</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-open()-method" data-tested-assertations="following::ol/li[14]/ul/li[1] following::ol/li[14]/ul/li[2] following::ol/li[15]/ol/li[1] following::ol/li[15]/ol/li[2]" />
+  </head>
+  <body>
+    <div id="log"></div>
+    <script>
+      var test = async_test()
+      test.step(function() {
+        var client = new XMLHttpRequest(),
+            result = [],
+            expected = [1,2,3,4]
+        client.onreadystatechange = function() {
+          test.step(function() {
+            result.push(client.readyState)
+            if(4 == client.readyState) {
+              assert_array_equals(result, expected)
+              assert_equals(client.responseText, 'top\n')
+              test.done()
+            }
+          })
+        }
+        client.open("GET", "resources/folder.txt")
+        client.open("GET", "folder.txt")
+        client.send(null)
+      })
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/open-open-sync-send.htm b/test/wpt/tests/xhr/open-open-sync-send.htm
new file mode 100644
index 00000000000..b0badfd8aa0
--- /dev/null
+++ b/test/wpt/tests/xhr/open-open-sync-send.htm
@@ -0,0 +1,31 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>XMLHttpRequest: open() - open() (sync) - send()</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-open()-method" data-tested-assertations="following::ol/li[14]/ul/li[1] following::ol/li[14]/ul/li[2] following::ol/li[14]/ul/li[3] following::ol/li[15]/ol/li[1] following::ol/li[15]/ol/li[2]" />
+  </head>
+  <body>
+    <div id="log"></div>
+    <script>
+      var test = async_test()
+      test.step(function() {
+        var client = new XMLHttpRequest(),
+            result = [],
+            expected = [1,4]
+        client.onreadystatechange = function() {
+          test.step(function() {
+            result.push(client.readyState)
+          })
+        }
+        client.open("GET", "folder.txt")
+        client.open("GET", "folder.txt", false)
+        client.send(null)
+        assert_equals(client.responseText, 'top\n')
+        assert_array_equals(result, expected)
+        test.done()
+      })
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/open-parameters-toString.htm b/test/wpt/tests/xhr/open-parameters-toString.htm
new file mode 100644
index 00000000000..c059482cbf6
--- /dev/null
+++ b/test/wpt/tests/xhr/open-parameters-toString.htm
@@ -0,0 +1,54 @@
+<!doctype html>
+<title>XMLHttpRequest: open() attempts to toString its string parameters</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<div id="log"></div>
+<script>
+test(() => {
+  let log = [];
+  let expected = [
+    'method',
+    'url',
+    // NOTE: 'async' intentionally missing
+    'username',
+    'password',
+  ];
+
+  let xhr = new XMLHttpRequest;
+  xhr.open(
+    {
+      toString() {
+        log.push('method');
+        return 'get';
+      },
+    },
+    {
+      toString() {
+        log.push('url');
+        return location.href;
+      },
+    },
+    // NOTE: ToBoolean should not invoke valueOf
+    {
+      valueOf() {
+        log.push('async');
+        return true;
+      },
+    },
+    {
+      toString() {
+        log.push('username');
+        return 'username';
+      },
+    },
+    {
+      toString() {
+        log.push('password');
+        return 'password';
+      },
+    }
+  );
+
+  assert_array_equals(log, expected);
+});
+</script>
diff --git a/test/wpt/tests/xhr/open-referer.htm b/test/wpt/tests/xhr/open-referer.htm
new file mode 100644
index 00000000000..d7ed793ebe2
--- /dev/null
+++ b/test/wpt/tests/xhr/open-referer.htm
@@ -0,0 +1,20 @@
+<!doctype html>
+<html>
+  <head>
+    <title>XMLHttpRequest: open() - value of Referer header</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-open()-method">
+  </head>
+  <body>
+    <div id="log"></div>
+    <script>
+      test(function() {
+        var client = new XMLHttpRequest()
+        client.open("POST", "resources/inspect-headers.py?filter_name=referer", false)
+        client.send(null)
+        assert_equals(client.responseText, "Referer: "+location.href+'\n')
+      })
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/open-send-during-abort.htm b/test/wpt/tests/xhr/open-send-during-abort.htm
new file mode 100644
index 00000000000..dc6f86bfc2c
--- /dev/null
+++ b/test/wpt/tests/xhr/open-send-during-abort.htm
@@ -0,0 +1,27 @@
+<!doctype html>
+<title>XMLHttpRequest: open() during abort()</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<div id="log"></div>
+<script>
+async_test(t => {
+  let result = [],
+      client = new XMLHttpRequest(),
+      expected = [1, 4, 1, 'hello']
+  client.open("GET", "data:text/plain,")
+  result.push(client.readyState)
+  client.send()
+  client.onreadystatechange = t.step_func(() => {
+    client.onreadystatechange = null
+    result.push(client.readyState)
+    client.open("GET", "data:text/plain,hello")
+    client.onload = t.step_func_done(() => {
+      result.push(client.responseText)
+      assert_array_equals(result, expected)
+    })
+    client.send()
+  })
+  client.abort()
+  result.push(client.readyState)  // surprise! should not be "unsent" even though we called abort()
+})
+</script>
diff --git a/test/wpt/tests/xhr/open-send-open.htm b/test/wpt/tests/xhr/open-send-open.htm
new file mode 100644
index 00000000000..d57592c0ba3
--- /dev/null
+++ b/test/wpt/tests/xhr/open-send-open.htm
@@ -0,0 +1,33 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>XMLHttpRequest: open() - send() - open()</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-open()-method" data-tested-assertations="following::ol/li[14]/ul/li[1] following::ol/li[14]/ul/li[2] following::ol/li[15]/ol/li[1] following::ol/li[15]/ol/li[2]" />
+  </head>
+  <body>
+    <div id="log"></div>
+    <script>
+      var test = async_test()
+      test.step(function() {
+        var client = new XMLHttpRequest(),
+            result = [],
+            expected = [1, 'a', 'b', 'c']
+        client.onreadystatechange = function() {
+          test.step(function() {
+            result.push(client.readyState)
+          })
+        }
+        client.open("GET", "folder.txt")
+        result.push('a')
+        client.send()
+        result.push('b')
+        client.open("GET", "folder.txt")
+        result.push('c')
+        assert_array_equals(result, expected)
+        test.done()
+      })
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/open-sync-open-send.htm b/test/wpt/tests/xhr/open-sync-open-send.htm
new file mode 100644
index 00000000000..cc81c522394
--- /dev/null
+++ b/test/wpt/tests/xhr/open-sync-open-send.htm
@@ -0,0 +1,41 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>XMLHttpRequest: open() (sync) - send() - open()</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-open()-method" data-tested-assertations="following::ol[1]/li[14]/ul/li[1] following::ol[1]/li[14]/ul/li[2] following::ol[1]/li[14]/ul/li[3] following::ol[1]/li[15]/ol/li[1] following::ol[1]/li[15]/ol/li[2]" />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-responsexml-attribute" data-tested-assertations="following::ol[1]/li[2]" />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-responsetext-attribute" data-tested-assertations="following::ol[1]/li[2]" />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-status-attribute" data-tested-assertations="following::ol[1]/li[1]" />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-statustext-attribute" data-tested-assertations="following::ol[1]/li[1]" />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-getallresponseheaders()-method" data-tested-assertations="following::ol[1]/li[1]" />
+
+  </head>
+  <body>
+    <div id="log"></div>
+    <script>
+      var test = async_test()
+      test.step(function() {
+        var client = new XMLHttpRequest(),
+            result = [],
+            expected = [1]
+        client.onreadystatechange = function() {
+          test.step(function() {
+            result.push(client.readyState)
+          })
+        }
+        client.open("GET", "folder.txt")
+        client.send(null)
+        client.open("GET", "folder.txt", false)
+        assert_array_equals(result, expected)
+        assert_equals(client.responseXML, null)
+        assert_equals(client.responseText, "")
+        assert_equals(client.status, 0)
+        assert_equals(client.statusText, "")
+        assert_equals(client.getAllResponseHeaders(), "")
+        test.done()
+      })
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/open-url-about-blank-window.htm b/test/wpt/tests/xhr/open-url-about-blank-window.htm
new file mode 100644
index 00000000000..5be3b77ddfe
--- /dev/null
+++ b/test/wpt/tests/xhr/open-url-about-blank-window.htm
@@ -0,0 +1,23 @@
+<!doctype html>
+<html>
+  <head>
+    <title>XMLHttpRequest: open() resolving URLs (about:blank iframe)</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-open()-method" data-tested-assertations="following::ol/li[2]/ol/li[2] following::ol/li[7] following::ol/li[14]/ul/li[2]" />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-responsetext-attribute" data-tested-assertations="following::ol/li[4]" />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#concept-xmlhttprequest-document" data-tested-assertations=".." />
+  </head>
+  <body>
+    <div id="log"></div>
+    <iframe src="about:blank"></iframe>
+    <script>
+      test(function() {
+        var client = new self[0].XMLHttpRequest()
+        client.open("GET", "folder.txt", false)
+        client.send("")
+        assert_equals(client.responseText, "top\n")
+      })
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/open-url-base-inserted-after-open.htm b/test/wpt/tests/xhr/open-url-base-inserted-after-open.htm
new file mode 100644
index 00000000000..a4d641fafcf
--- /dev/null
+++ b/test/wpt/tests/xhr/open-url-base-inserted-after-open.htm
@@ -0,0 +1,24 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>XMLHttpRequest: open() resolving URLs - insert &lt;base> after open()</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-open()-method" data-tested-assertations="following::ol/li[2]/ol/li[2] following::ol/li[7] following::ol/li[14]/ul/li[2]" />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-responsetext-attribute" data-tested-assertations="following::ol/li[4]" />
+  </head>
+  <body>
+    <div id="log"></div>
+    <script>
+      test(function() {
+        var client = new XMLHttpRequest(),
+            base = document.createElement("base")
+        base.href = location.href.replace(/\/[^/]*$/, '') + "/resources/"
+        client.open("GET", "folder.txt", false)
+        document.getElementsByTagName("head")[0].appendChild(base)
+        client.send(null)
+        assert_equals(client.responseText, "top\n")
+      })
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/open-url-base-inserted.htm b/test/wpt/tests/xhr/open-url-base-inserted.htm
new file mode 100644
index 00000000000..69ad6193d8e
--- /dev/null
+++ b/test/wpt/tests/xhr/open-url-base-inserted.htm
@@ -0,0 +1,24 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>XMLHttpRequest: open() resolving URLs - insert &lt;base></title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-open()-method" data-tested-assertations="following::ol/li[2]/ol/li[2] following::ol/li[7] following::ol/li[14]/ul/li[2]" />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-responsetext-attribute" data-tested-assertations="following::ol/li[4]" />
+  </head>
+  <body>
+    <div id="log"></div>
+    <script>
+      test(function() {
+        var client = new XMLHttpRequest(),
+            base = document.createElement("base")
+        base.href = location.href.replace(/\/[^/]*$/, '') + "/resources/"
+        document.getElementsByTagName("head")[0].appendChild(base)
+        client.open("GET", "folder.txt", false)
+        client.send(null)
+        assert_equals(client.responseText, "bottom\n")
+      })
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/open-url-base.htm b/test/wpt/tests/xhr/open-url-base.htm
new file mode 100644
index 00000000000..3c0e8c99d51
--- /dev/null
+++ b/test/wpt/tests/xhr/open-url-base.htm
@@ -0,0 +1,22 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>XMLHttpRequest: open() resolving URLs - &lt;base></title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <base href="./resources/">
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-open()-method" data-tested-assertations="following::ol/li[2]/ol/li[2] following::ol/li[7] following::ol/li[14]/ul/li[2]" />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-responsetext-attribute" data-tested-assertations="following::ol/li[4]" />
+  </head>
+  <body>
+    <div id="log"></div>
+    <script>
+      test(function() {
+        var client = new XMLHttpRequest()
+        client.open("GET", "folder.txt", false)
+        client.send(null)
+        assert_equals(client.responseText, "bottom\n")
+      })
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/open-url-encoding.htm b/test/wpt/tests/xhr/open-url-encoding.htm
new file mode 100644
index 00000000000..5155a57d65a
--- /dev/null
+++ b/test/wpt/tests/xhr/open-url-encoding.htm
@@ -0,0 +1,26 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset=windows-1252>
+    <title>XMLHttpRequest: open() - URL encoding</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+  </head>
+  <body>
+    <div id="log"></div>
+    <script>
+      test(function() {
+        var client = new XMLHttpRequest()
+        client.open("GET", "resources/content.py?\u00DF", false) // This is the German "eszett" character
+        client.send()
+        assert_equals(client.getResponseHeader("x-request-query"), "%DF")
+      }, "percent encode characters");
+      test(function() {
+        var client = new XMLHttpRequest()
+        client.open("GET", "resources/content.py?\uD83D", false)
+        client.send()
+        assert_equals(client.getResponseHeader("x-request-query"), "%26%2365533%3B");
+      }, "lone surrogate");
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/open-url-fragment.htm b/test/wpt/tests/xhr/open-url-fragment.htm
new file mode 100644
index 00000000000..03f4016797c
--- /dev/null
+++ b/test/wpt/tests/xhr/open-url-fragment.htm
@@ -0,0 +1,38 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>XMLHttpRequest: open() resolving URLs - fragment identifier</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-open()-method" data-tested-assertations="following::ol[1]/li[7]" />
+  </head>
+  <body>
+    <div id="log"></div>
+    <script>
+      test(function() {
+        var client = new XMLHttpRequest()
+        client.open("GET", "folder.txt#foobar", false)
+        client.send(null)
+        assert_equals(client.responseText, "top\n")
+      })
+      test(function() {
+        var client = new XMLHttpRequest()
+        client.open("GET", "resources/requri.py#foobar", false)
+        client.send(null)
+        assert_regexp_match(client.responseText, /xhr\/resources\/requri\.py$/)
+      }, 'make sure fragment is removed from URL before request')
+      test(function() {
+        var client = new XMLHttpRequest()
+        client.open("GET", "resources/requri.py?help=#foobar", false)
+        client.send(null)
+        assert_regexp_match(client.responseText, /xhr\/resources\/requri\.py\?help=$/)
+      }, 'make sure fragment is removed from URL before request (with query string)')
+      test(function() {
+        var client = new XMLHttpRequest()
+        client.open("GET", "resources/requri.py?" +encodeURIComponent("#foobar"), false)
+        client.send(null)
+        assert_regexp_match(client.responseText, /xhr\/resources\/requri\.py\?%23foobar$/)
+      }, 'make sure escaped # is not removed')
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/open-url-javascript-window-2.htm b/test/wpt/tests/xhr/open-url-javascript-window-2.htm
new file mode 100644
index 00000000000..f5ddd424976
--- /dev/null
+++ b/test/wpt/tests/xhr/open-url-javascript-window-2.htm
@@ -0,0 +1,19 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>XMLHttpRequest: open() - resolving URLs (javascript: &lt;iframe>; 2)</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-open()-method" data-tested-assertations="following::ol[1]/li[2]/ol[1]/li[2] following::ol[1]/li[7] following::ol[1]/li[14]/ul/li[2]" />
+  </head>
+  <body>
+    <div id="log"></div>
+    <script>
+      var test = async_test()
+      test.step(function() {
+        var iframe = document.body.appendChild(document.createElement("iframe"))
+        iframe.src = "javascript:parent.test.step(function() { var x = new XMLHttpRequest(); x.open('GET', 'folder.txt', false); x.send(null); parent.assert_equals(x.responseText, 'top\\n'); parent.test.done() })"
+      })
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/open-url-javascript-window.htm b/test/wpt/tests/xhr/open-url-javascript-window.htm
new file mode 100644
index 00000000000..cd208d51ad3
--- /dev/null
+++ b/test/wpt/tests/xhr/open-url-javascript-window.htm
@@ -0,0 +1,28 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>XMLHttpRequest: open() - resolving URLs (javascript: &lt;iframe>; 1)</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-open()-method" data-tested-assertations="following::ol[1]/li[2]/ol[1]/li[2] following::ol[1]/li[7] following::ol[1]/li[14]/ul/li[2]" />
+  </head>
+  <body>
+    <div id="log"></div>
+    <script>
+      var test = async_test()
+      function request() {
+        test.step(function() {
+          var x = new XMLHttpRequest()
+          x.open("GET", "folder.txt", false)
+          x.send(null)
+          assert_equals(x.responseText, "top\n")
+          test.done()
+        })
+      }
+      test.step(function() {
+        var iframe = document.body.appendChild(document.createElement("iframe"))
+        iframe.src = "javascript:parent.request()"
+      })
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/open-url-multi-window-2.htm b/test/wpt/tests/xhr/open-url-multi-window-2.htm
new file mode 100644
index 00000000000..64cc96b61b2
--- /dev/null
+++ b/test/wpt/tests/xhr/open-url-multi-window-2.htm
@@ -0,0 +1,25 @@
+<!doctype html>
+<html>
+  <head>
+    <title>XMLHttpRequest: open() resolving URLs (multi-Window; 2; evil)</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-open()-method" data-tested-assertations="following::ol[1]/li[2]/ol[1]/li[1]" />
+  </head>
+  <body>
+    <div id="log"></div>
+    <script>
+    function init(){ // called from page inside IFRAME
+        test(function() {
+          var client = new self[0].XMLHttpRequest();
+          let exceptionCtor = self[0].DOMException;
+          document.body.removeChild(document.getElementsByTagName("iframe")[0])
+          assert_throws_dom("InvalidStateError", exceptionCtor, function() {
+            client.open("GET", "folder.txt")
+          }, "open() when associated document's IFRAME is removed");
+        });
+      }
+    </script>
+    <iframe src="resources/init.htm"></iframe>
+ </body>
+</html>
diff --git a/test/wpt/tests/xhr/open-url-multi-window-3.htm b/test/wpt/tests/xhr/open-url-multi-window-3.htm
new file mode 100644
index 00000000000..e156857fe05
--- /dev/null
+++ b/test/wpt/tests/xhr/open-url-multi-window-3.htm
@@ -0,0 +1,25 @@
+<!doctype html>
+<html>
+  <head>
+    <title>XMLHttpRequest: open() resolving URLs (multi-Window; 3; evil)</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+  </head>
+  <body>
+    <div id="log"></div>
+    <script>
+      function init() {
+        test(function() {
+          var client = new self[0].XMLHttpRequest();
+          let exceptionCtor = self[0].DOMException;
+          client.open("GET", "folder.txt")
+          document.body.removeChild(document.getElementsByTagName("iframe")[0])
+          assert_throws_dom("InvalidStateError", exceptionCtor, function() {
+            client.send(null)
+          }, "send() when associated document's IFRAME is removed");
+        })
+      }
+    </script>
+    <iframe src="resources/init.htm"></iframe>
+ </body>
+</html>
diff --git a/test/wpt/tests/xhr/open-url-multi-window-4.htm b/test/wpt/tests/xhr/open-url-multi-window-4.htm
new file mode 100644
index 00000000000..3804c9b3871
--- /dev/null
+++ b/test/wpt/tests/xhr/open-url-multi-window-4.htm
@@ -0,0 +1,50 @@
+<!doctype html>
+<html>
+  <head>
+    <title>XMLHttpRequest: open() resolving URLs (multi-Window; 4; evil)</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+  </head>
+  <body>
+    <div id="log"></div>
+    <script>
+    /*
+    It's unclear what the pass condition should be for this test.
+    Implementations:
+    Firefox, Opera (Presto): terminate request with no further events when IFRAME is removed.
+    Chrome: completes request to readyState=4 but responseText is "" so it's pretty much terminated with an extra event for "DONE" state
+    Pass condition is now according to my suggested spec text in https://github.com/whatwg/xhr/pull/3 , if that's not accepted we'll have to amend this test
+    */
+      var test = async_test()
+      function init() {
+        test.step(function() {
+          var hasErrorEvent = false
+          var client = new self[0].XMLHttpRequest()
+          client.onreadystatechange = function() {
+            test.step(function() {
+              if(client.readyState == 4) {
+                assert_equals(client.responseText, "", "responseText is empty on inactive document error condition")
+              }
+            })
+          }
+          client.addEventListener('error', function(){
+            test.step(function() {
+              hasErrorEvent = true
+              assert_equals(client.readyState, 4, "readyState is 4 when error listener fires")
+            })
+          })
+          client.addEventListener('loadend', function(){
+            test.step(function() {
+              assert_true(hasErrorEvent, "should get an error event")
+              test.done()
+            })
+          })
+          client.open("GET", "folder.txt")
+          client.send(null)
+          document.body.removeChild(document.getElementsByTagName("iframe")[0])
+        })
+      }
+    </script>
+    <iframe src="resources/init.htm"></iframe>
+ </body>
+</html>
diff --git a/test/wpt/tests/xhr/open-url-multi-window-5.htm b/test/wpt/tests/xhr/open-url-multi-window-5.htm
new file mode 100644
index 00000000000..32c467a4956
--- /dev/null
+++ b/test/wpt/tests/xhr/open-url-multi-window-5.htm
@@ -0,0 +1,32 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>XMLHttpRequest: open() resolving URLs (multi-Window; 5)</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-open()-method" data-tested-assertations="following::ol[1]/li[2]/ol[1]/li[1]" />
+  </head>
+  <body>
+    <div id="log"></div>
+    <script>
+      var test = async_test(),
+          client,
+          exceptionCtor,
+          count = 0;
+      function init() {
+        test.step(function() {
+          if(0 == count) {
+            client = new self[0].XMLHttpRequest();
+            exceptionCtor = self[0].DOMException;
+            count++
+            self[0].location.reload()
+          } else if(1 == count) {
+            assert_throws_dom("InvalidStateError", exceptionCtor, function() {client.open("GET", "...") });
+            test.done()
+          }
+        })
+      }
+    </script>
+    <iframe src="resources/init.htm"></iframe>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/open-url-multi-window-6.htm b/test/wpt/tests/xhr/open-url-multi-window-6.htm
new file mode 100644
index 00000000000..d834a048a51
--- /dev/null
+++ b/test/wpt/tests/xhr/open-url-multi-window-6.htm
@@ -0,0 +1,41 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>XMLHttpRequest: open() in document that is not fully active (but may be active) should throw</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-open()-method">
+  </head>
+  <body>
+    <div id="log"></div>
+    <script>
+      var test = async_test(),
+          client,
+          count = 0,
+          win = window.open("resources/init.htm");
+      test.add_cleanup(function() { win.close(); });
+      function init() {
+        test.step(function() {
+          if(0 == count) {
+            var doc = win.document;
+            var ifr = document.createElement("iframe");
+            ifr.onload = function() {
+              // Again, do things async so we're not doing loads from inside
+              // load events.
+              test.step_timeout(function() {
+                client = new ifr.contentWindow.XMLHttpRequest();
+                count++;
+                // Important to do a normal navigation, not a reload.
+                win.location.href = "resources/init.htm?avoid-replace";
+              }, 0);
+            }
+            doc.body.appendChild(ifr);
+          } else if(1 == count) {
+            assert_throws_dom("InvalidStateError", function() { client.open("GET", "...") })
+            test.done()
+          }
+        })
+      }
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/open-url-multi-window.htm b/test/wpt/tests/xhr/open-url-multi-window.htm
new file mode 100644
index 00000000000..347f4b7e59c
--- /dev/null
+++ b/test/wpt/tests/xhr/open-url-multi-window.htm
@@ -0,0 +1,31 @@
+<!doctype html>
+<html>
+  <head>
+    <title>XMLHttpRequest: open() resolving URLs (multi-Window; 1)</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-open()-method" data-tested-assertations="following::ol[1]/li[2]/ol[1]/li[2] following::ol[1]/li[7] following::ol[1]/li[14]/ul/li[2]" />
+  </head>
+  <body>
+    <div id="log"></div>
+    <script>
+      var test = async_test()
+      function init() {
+        test.step(function() {
+          var client = new self[0].XMLHttpRequest()
+          client.onreadystatechange = function() {
+            test.step(function() {
+              if(client.readyState == 4) {
+                assert_equals(client.responseText, "bottom\n")
+                test.done()
+              }
+            })
+          }
+          client.open("GET", "folder.txt")
+          client.send("")
+        })
+      }
+    </script>
+    <iframe src="resources/init.htm"></iframe>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/open-url-redirected-sharedworker-origin.htm b/test/wpt/tests/xhr/open-url-redirected-sharedworker-origin.htm
new file mode 100644
index 00000000000..02699919585
--- /dev/null
+++ b/test/wpt/tests/xhr/open-url-redirected-sharedworker-origin.htm
@@ -0,0 +1,11 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>XMLHttpRequest: redirected classic shared worker scripts, origin and referrer</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<div id="log"></div>
+<script>
+var finalWorkerURL = "workerxhr-origin-referrer.js";
+var url = "resources/redirect.py?location=" + encodeURIComponent(finalWorkerURL);
+fetch_tests_from_worker(new SharedWorker(url));
+</script>
diff --git a/test/wpt/tests/xhr/open-url-redirected-worker-origin.htm b/test/wpt/tests/xhr/open-url-redirected-worker-origin.htm
new file mode 100644
index 00000000000..a0e064840f4
--- /dev/null
+++ b/test/wpt/tests/xhr/open-url-redirected-worker-origin.htm
@@ -0,0 +1,11 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>XMLHttpRequest: redirected classic dedicated worker scripts, origin and referrer</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<div id="log"></div>
+<script>
+var finalWorkerURL = "workerxhr-origin-referrer.js";
+var url = "resources/redirect.py?location=" + encodeURIComponent(finalWorkerURL);
+fetch_tests_from_worker(new Worker(url));
+</script>
diff --git a/test/wpt/tests/xhr/open-url-worker-origin.htm b/test/wpt/tests/xhr/open-url-worker-origin.htm
new file mode 100644
index 00000000000..21cf1fcac0f
--- /dev/null
+++ b/test/wpt/tests/xhr/open-url-worker-origin.htm
@@ -0,0 +1,9 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>XMLHttpRequest: worker scripts, origin and referrer</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<div id="log"></div>
+<script>
+fetch_tests_from_worker(new Worker("resources/workerxhr-origin-referrer.js"));
+</script>
diff --git a/test/wpt/tests/xhr/open-url-worker-simple.htm b/test/wpt/tests/xhr/open-url-worker-simple.htm
new file mode 100644
index 00000000000..a77ef6feedd
--- /dev/null
+++ b/test/wpt/tests/xhr/open-url-worker-simple.htm
@@ -0,0 +1,25 @@
+ <!DOCTYPE html>
+<html>
+<head>
+    <meta charset="utf-8" />
+    <title>XMLHttpRequest: relative URLs in worker scripts resolved by script URL</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-open()-method" data-tested-assertations="following::OL[1]/LI[3] following::OL[1]/LI[3]/ol[1]/li[1]" />
+</head>
+<body>
+    <div id="log"></div>
+    <script type="text/javascript">
+        var test = async_test()
+        var worker = new Worker("resources/workerxhr-simple.js")
+    	worker.onmessage = function (e) {
+            test.step(function(){
+                assert_equals(e.data, 'PASSED')
+                test.done()
+            })
+        }
+        worker.postMessage('start')
+    </script>
+</body>
+</html>
+
diff --git a/test/wpt/tests/xhr/open-user-password-non-same-origin.htm b/test/wpt/tests/xhr/open-user-password-non-same-origin.htm
new file mode 100644
index 00000000000..e49888cd493
--- /dev/null
+++ b/test/wpt/tests/xhr/open-user-password-non-same-origin.htm
@@ -0,0 +1,25 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>XMLHttpRequest: open() - user/pass argument and non same-origin URL doesn't throw</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-open()-method" data-tested-assertations="following::ol/li[9]/ol/li[1] following::ol/li[9]/ol/li[2] following::ol/li[15]/ol/li[1]" />
+  </head>
+  <body>
+    <div id="log"></div>
+    <script>
+      var m = "GET",
+          u = "http://test2.w3.org/",
+          a = false
+        test(function() {
+          var client = new XMLHttpRequest()
+          client.open(m, u, a, "x")
+          assert_equals(client.readyState, 1, "open() was successful - 1")
+          var client2 = new XMLHttpRequest()
+          client2.open(m, u, a, "x", "x")
+          assert_equals(client2.readyState, 1, "open() was successful - 2")
+        })
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/over-1-meg.any.js b/test/wpt/tests/xhr/over-1-meg.any.js
new file mode 100644
index 00000000000..ad5831404e1
--- /dev/null
+++ b/test/wpt/tests/xhr/over-1-meg.any.js
@@ -0,0 +1,16 @@
+"use strict";
+
+async_test(t => {
+  const xhr = new XMLHttpRequest();
+  xhr.open("GET", "./resources/over-1-meg.txt");
+
+  xhr.addEventListener("load", t.step_func_done(() => {
+    const result = xhr.responseText;
+    const desiredResult = "abcd".repeat(290000);
+
+    assert_equals(result.length, desiredResult.length); // to avoid large diffs if they are lengthwise different
+    assert_equals(result, desiredResult);
+  }));
+
+  xhr.send();
+});
diff --git a/test/wpt/tests/xhr/overridemimetype-blob.html b/test/wpt/tests/xhr/overridemimetype-blob.html
new file mode 100644
index 00000000000..fef0dfe816d
--- /dev/null
+++ b/test/wpt/tests/xhr/overridemimetype-blob.html
@@ -0,0 +1,57 @@
+<!doctype html>
+<title>XMLHttpRequest: overrideMimeType() and responseType = "blob"</title>
+<meta name="timeout" content="long">
+<meta charset="utf-8">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<div id="log"></div>
+<script>
+async_test(t => {
+  const client = new XMLHttpRequest();
+  client.onload = t.step_func_done(() => {
+    assert_equals(client.getResponseHeader("Content-Type"), "");
+    assert_equals(client.response.type, "text/xml");
+  });
+  client.open("GET", "resources/status.py");
+  client.responseType = "blob";
+  client.send();
+}, "Use text/xml as fallback MIME type");
+
+async_test(t => {
+  const client = new XMLHttpRequest();
+  client.onload = t.step_func_done(() => {
+    assert_equals(client.getResponseHeader("Content-Type"), "");
+    assert_equals(client.response.type, "text/xml");
+  })
+  client.open("GET", "resources/status.py?content=thisshouldnotmakeadifferencebutdoes");
+  client.responseType = "blob";
+  client.send();
+}, "Use text/xml as fallback MIME type, 2");
+
+promise_test(() => {
+  // Don't load generated-mime-types.json as sending them all over the network would be prohibitive
+  return fetch("../mimesniff/mime-types/resources/mime-types.json").then(res => res.json()).then(runTests);
+}, "Loading data…");
+
+function runTests(tests) {
+  let index = 0;
+  tests.forEach((val) => {
+    if(typeof val === "string") {
+      return;
+    }
+    index++;
+    async_test(t => {
+      const client = new XMLHttpRequest(),
+            expectedOutput = val.output !== null ? val.output : "application/octet-stream";
+      client.onload = t.step_func_done(() => {
+        assert_equals(client.getResponseHeader("Content-Type"), "");
+        assert_equals(client.response.type, expectedOutput);
+      });
+      client.open("GET", "resources/status.py");
+      client.responseType = "blob";
+      client.overrideMimeType(val.input);
+      client.send();
+    }, index + ") MIME types need to be parsed and serialized: " + val.input);
+  });
+}
+</script>
diff --git a/test/wpt/tests/xhr/overridemimetype-done-state.any.js b/test/wpt/tests/xhr/overridemimetype-done-state.any.js
new file mode 100644
index 00000000000..5e704924365
--- /dev/null
+++ b/test/wpt/tests/xhr/overridemimetype-done-state.any.js
@@ -0,0 +1,20 @@
+// META title= XMLHttpRequest: overrideMimeType() in DONE state</title>
+
+/**
+ * Spec: <https://xhr.spec.whatwg.org/#the-overridemimetype()-method>; data-tested-assertations="/following::ol/li[1]"
+ */
+var test = async_test();
+var client = new XMLHttpRequest();
+client.onreadystatechange = test.step_func( function() {
+  if (client.readyState !== 4) return;
+  var text = client.responseText;
+  assert_not_equals(text, "");
+  assert_throws_dom("InvalidStateError", function() { client.overrideMimeType('application/xml;charset=Shift-JIS'); });
+  if (GLOBAL.isWindow()) {
+    assert_equals(client.responseXML, null);
+  }
+  assert_equals(client.responseText, text);
+  test.done();
+});
+client.open("GET", "resources/status.py?type="+encodeURIComponent('text/plain;charset=iso-8859-1')+'&content=%3Cmsg%3E%83%65%83%58%83%67%3C%2Fmsg%3E');
+client.send();
diff --git a/test/wpt/tests/xhr/overridemimetype-edge-cases.window.js b/test/wpt/tests/xhr/overridemimetype-edge-cases.window.js
new file mode 100644
index 00000000000..3f57e9a48f0
--- /dev/null
+++ b/test/wpt/tests/xhr/overridemimetype-edge-cases.window.js
@@ -0,0 +1,50 @@
+const testURL = "resources/status.py?type=" + encodeURIComponent("text/plain;charset=windows-1252") + "&content=%C2%F0";
+
+async_test(t => {
+  const client = new XMLHttpRequest();
+  client.onload = t.step_func_done(() => {
+    assert_equals(client.responseText, "\uFFFD\uFFFD");
+  });
+  client.overrideMimeType("text/plain;charset=UTF-8");
+  client.open("GET", testURL);
+  client.send();
+}, "overrideMimeType() is not reset by open(), basic");
+
+async_test(t => {
+  const client = new XMLHttpRequest();
+  let secondTime = false;
+  client.onload = t.step_func(() => {
+    if(!secondTime) {
+      assert_equals(client.responseText, "\uFFFD\uFFFD");
+      secondTime = true;
+      client.open("GET", testURL);
+      client.send();
+    } else {
+      assert_equals(client.responseText, "\uFFFD\uFFFD");
+      t.done();
+    }
+  });
+  client.open("GET", testURL);
+  client.overrideMimeType("text/plain;charset=UTF-8")
+  client.send();
+}, "overrideMimeType() is not reset by open()");
+
+async_test(t => {
+  const client = new XMLHttpRequest();
+  client.onload = t.step_func_done(() => {
+    assert_equals(client.responseText, "Âð")
+  });
+  client.open("GET", testURL);
+  client.overrideMimeType("text/xml");
+  client.send();
+}, "If charset is not overridden by overrideMimeType() the original continues to be used");
+
+async_test(t => {
+  const client = new XMLHttpRequest();
+  client.onload = t.step_func_done(() => {
+    assert_equals(client.responseText, "\uFFFD\uFFFD")
+  });
+  client.open("GET", testURL);
+  client.overrideMimeType("text/plain;charset=342");
+  client.send();
+}, "Charset can be overridden by overrideMimeType() with a bogus charset");
diff --git a/test/wpt/tests/xhr/overridemimetype-headers-received-state-force-shiftjis.htm b/test/wpt/tests/xhr/overridemimetype-headers-received-state-force-shiftjis.htm
new file mode 100644
index 00000000000..578e28cb227
--- /dev/null
+++ b/test/wpt/tests/xhr/overridemimetype-headers-received-state-force-shiftjis.htm
@@ -0,0 +1,34 @@
+<!doctype html>
+<html>
+  <head>
+    <title>XMLHttpRequest: overrideMimeType() in HEADERS RECEIVED state, enforcing Shift-JIS encoding</title>
+    <meta charset="utf-8">
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-overridemimetype()-method" data-tested-assertations="/following::ol/li[1] /following::ol/li[4]" />
+  </head>
+  <body>
+    <div id="log"></div>
+    <script>
+      var test = async_test();
+      var client = new XMLHttpRequest();
+      var readyState2Reached = false;
+      client.onreadystatechange = test.step_func( function() {
+        if(client.readyState===2){
+          readyState2Reached = true;
+          try{
+            client.overrideMimeType('text/plain;charset=Shift-JIS');
+          }catch(e){
+            assert_unreached('overrideMimeType should not throw in state 2');
+          }
+        }
+        if (client.readyState !== 4) return;
+        assert_equals( readyState2Reached, true, "readyState = 2 event fired" );
+        assert_equals( client.responseText, 'テスト', 'overrideMimeType() in HEADERS RECEIVED state set encoding' );
+        test.done();
+      });
+      client.open("GET", "resources/status.py?type="+encodeURIComponent('text/html;charset=UTF-8')+'&content=%83%65%83%58%83%67');
+      client.send( '' );
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/overridemimetype-invalid-mime-type.htm b/test/wpt/tests/xhr/overridemimetype-invalid-mime-type.htm
new file mode 100644
index 00000000000..506aff84194
--- /dev/null
+++ b/test/wpt/tests/xhr/overridemimetype-invalid-mime-type.htm
@@ -0,0 +1,41 @@
+<!doctype html>
+<title>XMLHttpRequest: overrideMimeType() and invalid MIME types</title>
+<meta charset="utf-8">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<link rel="help" href="https://xhr.spec.whatwg.org/#the-overridemimetype()-method">
+<div id="log"></div>
+<script>
+async_test(t => {
+  const client = new XMLHttpRequest()
+  client.onload = t.step_func_done(() => {
+    assert_equals(client.responseText, "ÿ")
+    assert_equals(client.getResponseHeader("Content-Type"), "text/html;charset=windows-1252")
+  })
+  client.open("GET", "resources/status.py?type=" + encodeURIComponent("text/html;charset=windows-1252") + "&content=%FF")
+  client.overrideMimeType("bogus")
+  client.send()
+}, "Bogus MIME type does not override encoding")
+
+async_test(t => {
+  const client = new XMLHttpRequest()
+  client.onload = t.step_func_done(() => {
+    assert_equals(client.responseText, "ÿ")
+    assert_equals(client.getResponseHeader("Content-Type"), "text/html;charset=windows-1252")
+  })
+  client.open("GET", "resources/status.py?type=" + encodeURIComponent("text/html;charset=windows-1252") + "&content=%FF")
+  client.overrideMimeType("bogus;charset=Shift_JIS")
+  client.send()
+}, "Bogus MIME type does not override encoding, 2")
+
+async_test(t => {
+  const client = new XMLHttpRequest()
+  client.onload = t.step_func_done(() => {
+    assert_equals(client.responseXML, null)
+    assert_equals(client.getResponseHeader("Content-Type"), "text/xml")
+  })
+  client.open("GET", "resources/status.py?type=" + encodeURIComponent("text/xml") + "&content=" + encodeURIComponent("<x/>"))
+  client.overrideMimeType("bogus")
+  client.send()
+}, "Bogus MIME type does override MIME type")
+</script>
diff --git a/test/wpt/tests/xhr/overridemimetype-loading-state.htm b/test/wpt/tests/xhr/overridemimetype-loading-state.htm
new file mode 100644
index 00000000000..06e4d5fec1e
--- /dev/null
+++ b/test/wpt/tests/xhr/overridemimetype-loading-state.htm
@@ -0,0 +1,32 @@
+<!doctype html>
+<html>
+  <head>
+    <title>XMLHttpRequest: overrideMimeType() in LOADING state</title>
+    <meta charset="utf-8">
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-overridemimetype()-method" data-tested-assertations="/following::ol/li[1]" />
+  </head>
+  <body>
+    <div id="log"></div>
+    <script>
+      var test = async_test();
+      test.step(function() {
+        var client = new XMLHttpRequest();
+        client.onreadystatechange = test.step_func(function() {
+          if (client.readyState === 3){
+            assert_throws_dom("InvalidStateError", function(){
+              client.overrideMimeType('application/xml;charset=Shift-JIS');
+            });
+          }else if(client.readyState===4){
+            assert_equals(client.responseXML, null);
+            test.done();
+          }
+        });
+        client.open("GET", "resources/status.py?type="+encodeURIComponent('text/plain;charset=iso-8859-1')+'&content=%3Cmsg%3E%83%65%83%58%83%67%3C%2Fmsg%3E');
+        client.send();
+      });
+    </script>
+
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/overridemimetype-open-state-force-utf-8.htm b/test/wpt/tests/xhr/overridemimetype-open-state-force-utf-8.htm
new file mode 100644
index 00000000000..5a261005d97
--- /dev/null
+++ b/test/wpt/tests/xhr/overridemimetype-open-state-force-utf-8.htm
@@ -0,0 +1,27 @@
+<!doctype html>
+<html>
+  <head>
+    <title>XMLHttpRequest: overrideMimeType() in open state, enforcing UTF-8 encoding</title>
+    <meta charset="utf-8">
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-overridemimetype()-method" data-tested-assertations="/following::ol/li[3] /following::ol/li[4]" />
+  </head>
+  <body>
+    <div id="log"></div>
+    <script>
+      var test = async_test();
+      test.step(function() {
+        var client = new XMLHttpRequest();
+        client.onreadystatechange = function() {
+          if (client.readyState !== 4) return;
+          assert_equals( client.responseText, 'テスト' );
+          test.done();
+        };
+        client.open("GET", "resources/status.py?type="+encodeURIComponent('text/html;charset=Shift-JIS')+'&content='+encodeURIComponent('テスト'));
+        client.overrideMimeType('text/plain;charset=UTF-8');
+        client.send( '' );
+      });
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/overridemimetype-open-state-force-xml.htm b/test/wpt/tests/xhr/overridemimetype-open-state-force-xml.htm
new file mode 100644
index 00000000000..00a4c0dd43d
--- /dev/null
+++ b/test/wpt/tests/xhr/overridemimetype-open-state-force-xml.htm
@@ -0,0 +1,34 @@
+<!doctype html>
+<html>
+  <head>
+    <title>XMLHttpRequest: overrideMimeType() in open state, XML MIME type with UTF-8 charset</title>
+    <meta charset="utf-8">
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-overridemimetype()-method" data-tested-assertations="/following::ol/li[3] /following::ol/li[4]" />
+  </head>
+  <body>
+    <div id="log"></div>
+    <script>
+      var test = async_test();
+      test.step(function() {
+        var client = new XMLHttpRequest();
+        client.onreadystatechange = function() {
+          if (client.readyState !== 4) return;
+          try{
+            var str = client.responseXML.documentElement.tagName+client.responseXML.documentElement.firstChild.tagName+client.responseXML.documentElement.firstChild.textContent;
+          }catch(e){
+            assert_unreached('Exception when reading responseXML');
+          }
+          assert_equals( client.responseXML.documentElement.tagName,  'test' );
+          assert_equals( client.responseXML.documentElement.firstChild.tagName,  'message' );
+          assert_equals( client.responseXML.documentElement.firstChild.textContent,  'Hello World！' );
+          test.done();
+        };
+        client.open("GET", "resources/status.py?type="+encodeURIComponent('text/plain;charset=Shift-JIS')+'&content='+encodeURIComponent('<test><message>Hello World！</message></test>'));
+        client.overrideMimeType('application/xml;charset=UTF-8');
+        client.send();
+      });
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/overridemimetype-unsent-state-force-shiftjis.any.js b/test/wpt/tests/xhr/overridemimetype-unsent-state-force-shiftjis.any.js
new file mode 100644
index 00000000000..b3125b014be
--- /dev/null
+++ b/test/wpt/tests/xhr/overridemimetype-unsent-state-force-shiftjis.any.js
@@ -0,0 +1,12 @@
+async_test(t => {
+  const client = new XMLHttpRequest();
+  client.overrideMimeType('text/plain;charset=Shift-JIS');
+  client.onreadystatechange = t.step_func(() => {
+    if (client.readyState === 4) {
+      assert_equals( client.responseText, 'テスト' );
+      t.done();
+    }
+  });
+  client.open("GET", "resources/status.py?type="+encodeURIComponent('text/html;charset=iso-8859-1')+'&content=%83%65%83%58%83%67');
+  client.send( '' );
+}, "XMLHttpRequest: overrideMimeType() in unsent state, enforcing Shift-JIS encoding");
diff --git a/test/wpt/tests/xhr/preserve-ua-header-on-redirect.htm b/test/wpt/tests/xhr/preserve-ua-header-on-redirect.htm
new file mode 100644
index 00000000000..fad883c1ef0
--- /dev/null
+++ b/test/wpt/tests/xhr/preserve-ua-header-on-redirect.htm
@@ -0,0 +1,43 @@
+<!doctype html>
+<html>
+  <head>
+    <title>XMLHttpRequest: User-Agent header is preserved on redirect</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+  </head>
+  <body>
+    <div id="log"></div>
+    <script>
+      var test = async_test()
+      test.step(function() {
+        var client = new XMLHttpRequest()
+          client.onreadystatechange = function() {
+            test.step(function() {
+              if(client.readyState == 4) {
+                assert_equals(client.responseText, 'User-Agent: '+navigator.userAgent+'\n')
+                test.done()
+              }
+            })
+          }
+        client.open("POST", "resources/redirect.py?location="+encodeURIComponent("inspect-headers.py?filter_name=user-agent"))
+        client.send(null)
+      })
+
+      var test2 = async_test()
+      test2.step(function() {
+        var client = new XMLHttpRequest()
+          client.onreadystatechange = function() {
+            test2.step(function() {
+              if(client.readyState == 4) {
+                assert_equals(client.responseText, 'User-Agent: TEST\n')
+                test2.done()
+              }
+            })
+          }
+        client.open("POST", "resources/redirect.py?location="+encodeURIComponent("inspect-headers.py?filter_name=user-agent"))
+        client.setRequestHeader("User-Agent", "TEST")
+        client.send(null)
+      })
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/progress-events-response-data-gzip.htm b/test/wpt/tests/xhr/progress-events-response-data-gzip.htm
new file mode 100644
index 00000000000..058064636d4
--- /dev/null
+++ b/test/wpt/tests/xhr/progress-events-response-data-gzip.htm
@@ -0,0 +1,83 @@
+<!doctype html>
+<html>
+  <head>
+    <title>XMLHttpRequest: progress events and GZIP encoding</title>
+    <meta name="timeout" content="long">
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#firing-events-using-the-progressevent-interface-for-http" data-tested-assertations="following::p[contains(text(),'content-encodings')]" />
+    <!-- TODO: find better spec reference when https://www.w3.org/Bugs/Public/show_bug.cgi?id=25587 is fixed -->
+  </head>
+  <body>
+    <div id="log"></div>
+    <script>
+      var test = async_test()
+      test.step(function() {
+        var client = new XMLHttpRequest()
+        /*
+
+          Two behaviours are considered acceptable, so there are two ways to
+          pass this test
+
+          a) Set data for the compressed resource:
+            * event.total reflects the Content-length of the gzipp'ed resource
+            * event.loaded how many gzipped bytes have arrived over the wire so far
+            * lengthComputable is true
+
+          or
+
+          b) If the implementation does not provide progress details for the compressed
+          resource, set
+            * lengthComputable to false
+            * event.total to 0
+            * event.loaded to the number of bytes available so far after gzip decoding
+
+          Implications of this are tested here as follows:
+
+          * If lengthComputable is true:
+              * Event.total must match Content-length header
+              * event.loaded must only ever increase in progress events
+                (and may never repeat its value).
+              * event.loaded must never exceed the Content-length.
+
+          * If lengthComputable is false:
+              * event.total should be 0
+              * event.loaded must only ever increase in progress events
+                (and may never repeat its value).
+              * event.loaded should be the length of the decompressed content, i.e.
+                bigger than Content-length header value when finished loading
+
+        */
+        var lastTotal;
+        var lastLoaded = -1;
+        client.addEventListener('loadend', test.step_func(function(e){
+          var len = parseInt(client.getResponseHeader('content-length'), 10)
+          if(e.lengthComputable){
+            assert_equals(e.total, len, 'event.total is content-length')
+            assert_equals(e.loaded, len, 'event.loaded should be content-length at loadend')
+          }else{
+            assert_equals(e.total, 0, 'if implementation can\'t compute event.total for gzipped content it is 0')
+            assert_true(e.loaded >= len, 'event.loaded should be set even if total is not computable')
+          }
+          test.done();
+        }), false)
+        client.addEventListener('progress', test.step_func(function(e){
+          if(lastTotal === undefined){
+            lastTotal = e.total;
+          }
+          if(e.lengthComputable && e.total && e.loaded){
+            assert_equals(e.total, lastTotal, 'event.total should remain invariant')
+            assert_less_than_equal(e.loaded, lastTotal, 'event.loaded should not exceed content-length')
+          }else{
+            assert_equals(e.total, 0, 'event.total should be 0')
+          }
+          assert_greater_than(e.loaded, lastLoaded, 'event.loaded should only ever increase')
+          lastLoaded = e.loaded;
+        }), false)
+        // image.gif is 165375 bytes compressed. Sending 45000 bytes at a time with 1 second delay will load it in 4 seconds
+        client.open("GET", "resources/image.gif?pipe=gzip|trickle(45000:d1:r2)", true)
+        client.send()
+      })
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/progressevent-constructor.html b/test/wpt/tests/xhr/progressevent-constructor.html
new file mode 100644
index 00000000000..0e771f4459f
--- /dev/null
+++ b/test/wpt/tests/xhr/progressevent-constructor.html
@@ -0,0 +1,47 @@
+<!doctype html>
+<title>ProgressEvent constructor</title>
+<link rel="help" href="https://xhr.spec.whatwg.org/#interface-progressevent">
+<link rel="help" href="https://dom.spec.whatwg.org/#concept-event-constructor">
+<link rel="help" href="https://dom.spec.whatwg.org/#interface-event">
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<div id=log></div>
+<script>
+test(function() {
+  var ev = new ProgressEvent("test")
+  assert_equals(ev.type, "test")
+  assert_equals(ev.target, null)
+  assert_equals(ev.currentTarget, null)
+  assert_equals(ev.eventPhase, Event.NONE)
+  assert_equals(ev.bubbles, false)
+  assert_equals(ev.cancelable, false)
+  assert_equals(ev.defaultPrevented, false)
+  assert_equals(ev.isTrusted, false)
+  assert_true(ev.timeStamp > 0)
+  assert_true("initEvent" in ev)
+  assert_equals(ev.lengthComputable, false)
+  assert_equals(ev.loaded, 0)
+  assert_equals(ev.total, 0)
+}, "Default event values.")
+test(function() {
+  var ev = new ProgressEvent("test")
+  assert_equals(ev["initProgressEvent"], undefined)
+}, "There must not be a initProgressEvent().")
+test(function() {
+  var ev = new ProgressEvent("I am an event", { type: "trololol", bubbles: true, cancelable: false})
+  assert_equals(ev.type, "I am an event")
+  assert_equals(ev.bubbles, true)
+  assert_equals(ev.cancelable, false)
+}, "Basic test.")
+test(function() {
+  var ev = new ProgressEvent(null, { lengthComputable: "hah", loaded: "2" })
+  assert_equals(ev.type, "null")
+  assert_equals(ev.lengthComputable, true)
+  assert_equals(ev.loaded, 2)
+}, "ECMAScript value conversion test.")
+test(function() {
+  var ev = new ProgressEvent("Xx", { lengthcomputable: true})
+  assert_equals(ev.type, "Xx")
+  assert_equals(ev.lengthComputable, false)
+}, "ProgressEventInit members must be matched case-sensitively.")
+</script>
diff --git a/test/wpt/tests/xhr/progressevent-interface.html b/test/wpt/tests/xhr/progressevent-interface.html
new file mode 100644
index 00000000000..7552ff73d3f
--- /dev/null
+++ b/test/wpt/tests/xhr/progressevent-interface.html
@@ -0,0 +1,49 @@
+<!DOCTYPE html>
+<title>The ProgressEvent interface</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<div id="log"></div>
+<script>
+test(function() {
+  assert_equals(typeof ProgressEvent, "function")
+  assert_equals(ProgressEvent.length, 1)
+})
+test(function() {
+  var desc = Object.getOwnPropertyDescriptor(ProgressEvent, "prototype")
+  assert_equals(desc.value, ProgressEvent.prototype)
+  assert_equals(desc.writable, false)
+  assert_equals(desc.enumerable, false)
+  assert_equals(desc.configurable, false)
+  assert_throws_js(TypeError, function() {
+    "use strict";
+    delete ProgressEvent.prototype;
+  })
+  assert_equals(ProgressEvent.prototype.constructor, ProgressEvent)
+  assert_equals(Object.getPrototypeOf(ProgressEvent.prototype), Event.prototype)
+}, "interface prototype object")
+var attributes = [
+  ["boolean", "lengthComputable"],
+  ["unsigned long long", "loaded"],
+  ["unsigned long long", "total"]
+];
+attributes.forEach(function(a) {
+  test(function() {
+    var desc = Object.getOwnPropertyDescriptor(ProgressEvent.prototype, a[1])
+    assert_equals(desc.enumerable, true)
+    assert_equals(desc.configurable, true)
+    assert_throws_js(TypeError, function() {
+      ProgressEvent.prototype[a[1]]
+    })
+  })
+})
+test(function() {
+  for (var p in window) {
+    assert_not_equals(p, "ProgressEvent")
+  }
+}, "Interface objects properties should not be Enumerable")
+test(function() {
+  assert_true(!!window.ProgressEvent, "Interface should exist.")
+  assert_true(delete window.ProgressEvent, "The delete operator should return true.")
+  assert_equals(window.ProgressEvent, undefined, "Interface should be gone.")
+}, "Should be able to delete ProgressEvent.")
+</script>
diff --git a/test/wpt/tests/xhr/request-content-length.any.js b/test/wpt/tests/xhr/request-content-length.any.js
new file mode 100644
index 00000000000..054d2cce9d2
--- /dev/null
+++ b/test/wpt/tests/xhr/request-content-length.any.js
@@ -0,0 +1,31 @@
+async_test(test => {
+  const client = new XMLHttpRequest();
+  const data = "This is 22 bytes long.";
+  let happened = false;
+  client.upload.onprogress = test.step_func(e => {
+    assert_true(e.lengthComputable);
+    assert_equals(e.total, data.length);
+    happened = true;
+  });
+  client.onload = test.step_func_done(() => {
+    assert_true(happened);
+    assert_true(client.responseText.includes(`Content-Length: ${data.length}`));
+  });
+  client.open("POST", "resources/echo-headers.py");
+  client.send(data);
+}, "Uploads need to set the Content-Length header");
+
+async_test(test => {
+  const client = new XMLHttpRequest();
+  const data = "blah";
+  const url = URL.createObjectURL(new Blob([data]));
+  client.open("GET", url);
+  client.send();
+  client.onload = test.step_func_done(e => {
+    assert_true(e.lengthComputable);
+    assert_equals(e.total, data.length);
+    assert_equals(e.loaded, data.length);
+    assert_equals(client.responseText, data);
+    assert_equals(client.getResponseHeader("Content-Length"), String(data.length));
+  });
+}, "Fetched blob: URLs set the Content-Length header");
diff --git a/test/wpt/tests/xhr/resources/accept-language.py b/test/wpt/tests/xhr/resources/accept-language.py
new file mode 100644
index 00000000000..b68cf355038
--- /dev/null
+++ b/test/wpt/tests/xhr/resources/accept-language.py
@@ -0,0 +1,3 @@
+def main(request, response):
+    return [(b"Content-Type", b"text/plain"),
+            request.headers.get(b"Accept-Language", b"NO")]
diff --git a/test/wpt/tests/xhr/resources/accept.py b/test/wpt/tests/xhr/resources/accept.py
new file mode 100644
index 00000000000..842df80cda0
--- /dev/null
+++ b/test/wpt/tests/xhr/resources/accept.py
@@ -0,0 +1,2 @@
+def main(request, response):
+    return [(b"Content-Type", b"text/plain")], request.headers.get(b"accept", b"NO")
diff --git a/test/wpt/tests/xhr/resources/access-control-allow-lists.py b/test/wpt/tests/xhr/resources/access-control-allow-lists.py
new file mode 100644
index 00000000000..32c11a0c39b
--- /dev/null
+++ b/test/wpt/tests/xhr/resources/access-control-allow-lists.py
@@ -0,0 +1,26 @@
+import json
+
+from wptserve.utils import isomorphic_decode
+
+def main(request, response):
+    if b"origin" in request.GET:
+        response.headers.set(b"Access-Control-Allow-Origin", request.GET[b"origin"])
+    elif b"origins" in request.GET:
+        for origin in request.GET[b"origins"].split(b','):
+            response.headers.set(b"Access-Control-Allow-Origin", request.GET[b"origin"])
+
+    if b"headers" in request.GET:
+        response.headers.set(b"Access-Control-Allow-Headers", request.GET[b"headers"])
+    if b"methods" in request.GET:
+        response.headers.set(b"Access-Control-Allow-Methods", request.GET[b"methods"])
+
+    headers = dict(request.headers)
+
+    for header in headers:
+        headers[header] = headers[header][0]
+
+    str_headers = {}
+    for key, val in headers.items():
+        str_headers[isomorphic_decode(key)] = isomorphic_decode(val)
+
+    return json.dumps(str_headers)
diff --git a/test/wpt/tests/xhr/resources/access-control-allow-with-body.py b/test/wpt/tests/xhr/resources/access-control-allow-with-body.py
new file mode 100644
index 00000000000..18564e2d44e
--- /dev/null
+++ b/test/wpt/tests/xhr/resources/access-control-allow-with-body.py
@@ -0,0 +1,15 @@
+def main(request, response):
+    headers = {
+        b"Cache-Control": b"no-store",
+        b"Access-Control-Allow-Headers": b"X-Requested-With",
+        b"Access-Control-Max-Age": 0,
+        b"Access-Control-Allow-Origin": b"*",
+        b"Access-Control-Allow-Methods": b"*",
+        b"Vary": b"Accept-Encoding",
+        b"Content-Type": b"text/plain"
+    }
+
+    for (name, value) in headers.items():
+        response.headers.set(name, value)
+
+    response.content = b"PASS"
diff --git a/test/wpt/tests/xhr/resources/access-control-auth-basic.py b/test/wpt/tests/xhr/resources/access-control-auth-basic.py
new file mode 100644
index 00000000000..d1c5579ce24
--- /dev/null
+++ b/test/wpt/tests/xhr/resources/access-control-auth-basic.py
@@ -0,0 +1,17 @@
+def main(request, response):
+    response.headers.set(b"Cache-Control", b"no-store")
+    response.headers.set(b"Access-Control-Allow-Origin", request.headers.get(b"origin"))
+    response.headers.set(b"Access-Control-Allow-Credentials", b"true")
+    uid = request.GET.first(b"uid", None)
+
+    if request.method == u"OPTIONS":
+        response.headers.set(b"Access-Control-Allow-Methods", b"PUT")
+    else:
+        username = request.auth.username
+        password = request.auth.password
+        if (not username) or (username != uid):
+            response.headers.set(b"WWW-Authenticate", b"Basic realm='Test Realm/Cross Origin'")
+            response.status = 401
+            response.content = b"Authentication cancelled"
+        else:
+            response.content = b"User: " + username + b", Password: " + password
diff --git a/test/wpt/tests/xhr/resources/access-control-basic-allow-no-credentials.py b/test/wpt/tests/xhr/resources/access-control-basic-allow-no-credentials.py
new file mode 100644
index 00000000000..e0668c67a19
--- /dev/null
+++ b/test/wpt/tests/xhr/resources/access-control-basic-allow-no-credentials.py
@@ -0,0 +1,5 @@
+def main(request, response):
+    response.headers.set(b"Content-Type", b"text/plain")
+    response.headers.set(b"Access-Control-Allow-Origin", request.headers.get(b"origin"))
+
+    response.content = b"PASS: Cross-domain access allowed."
diff --git a/test/wpt/tests/xhr/resources/access-control-basic-allow-star.py b/test/wpt/tests/xhr/resources/access-control-basic-allow-star.py
new file mode 100644
index 00000000000..38c5107cb71
--- /dev/null
+++ b/test/wpt/tests/xhr/resources/access-control-basic-allow-star.py
@@ -0,0 +1,5 @@
+def main(request, response):
+    response.headers.set(b"Content-Type", b"text/plain")
+    response.headers.set(b"Access-Control-Allow-Origin", b"*")
+
+    response.content = b"PASS: Cross-domain access allowed."
diff --git a/test/wpt/tests/xhr/resources/access-control-basic-allow.py b/test/wpt/tests/xhr/resources/access-control-basic-allow.py
new file mode 100644
index 00000000000..f1ca5875e26
--- /dev/null
+++ b/test/wpt/tests/xhr/resources/access-control-basic-allow.py
@@ -0,0 +1,6 @@
+def main(request, response):
+    response.headers.set(b"Content-Type", b"text/plain")
+    response.headers.set(b"Access-Control-Allow-Credentials", b"true")
+    response.headers.set(b"Access-Control-Allow-Origin", request.headers.get(b"origin"))
+
+    response.content = b"PASS: Cross-domain access allowed."
diff --git a/test/wpt/tests/xhr/resources/access-control-basic-cors-safelisted-request-headers.py b/test/wpt/tests/xhr/resources/access-control-basic-cors-safelisted-request-headers.py
new file mode 100644
index 00000000000..46523a905a9
--- /dev/null
+++ b/test/wpt/tests/xhr/resources/access-control-basic-cors-safelisted-request-headers.py
@@ -0,0 +1,16 @@
+from wptserve.utils import isomorphic_decode
+
+def main(request, response):
+    response.headers.set(b"Cache-Control", b"no-store")
+
+    # This should be a simple request; deny preflight
+    if request.method != u"POST":
+        response.status = 400
+        return
+
+    response.headers.set(b"Access-Control-Allow-Credentials", b"true")
+    response.headers.set(b"Access-Control-Allow-Origin", request.headers.get(b"origin"))
+
+    for header in [b"Accept", b"Accept-Language", b"Content-Language", b"Content-Type"]:
+        value = request.headers.get(header)
+        response.content += isomorphic_decode(header) + u": " + (isomorphic_decode(value) if value else u"<None>") + u'\n'
diff --git a/test/wpt/tests/xhr/resources/access-control-basic-cors-safelisted-response-headers.py b/test/wpt/tests/xhr/resources/access-control-basic-cors-safelisted-response-headers.py
new file mode 100644
index 00000000000..346b6b91965
--- /dev/null
+++ b/test/wpt/tests/xhr/resources/access-control-basic-cors-safelisted-response-headers.py
@@ -0,0 +1,19 @@
+def main(request, response):
+    headers = {
+        # CORS-safelisted
+        b"content-type": b"text/plain",
+        b"cache-control": b"no cache",
+        b"content-language": b"en",
+        b"expires": b"Fri, 30 Oct 1998 14:19:41 GMT",
+        b"last-modified": b"Tue, 15 Nov 1994 12:45:26 GMT",
+        b"pragma": b"no-cache",
+
+        # Non-CORS-safelisted
+        b"x-test": b"foobar",
+
+        b"Access-Control-Allow-Origin": b"*"
+    }
+    for header in headers:
+        response.headers.set(header, headers[header])
+
+    response.content = b"PASS: Cross-domain access allowed."
diff --git a/test/wpt/tests/xhr/resources/access-control-basic-denied.py b/test/wpt/tests/xhr/resources/access-control-basic-denied.py
new file mode 100644
index 00000000000..0d3964cb115
--- /dev/null
+++ b/test/wpt/tests/xhr/resources/access-control-basic-denied.py
@@ -0,0 +1,5 @@
+def main(request, response):
+    response.headers.set(b"Cache-Control", b"no-store")
+    response.headers.set(b"Content-Type", b"text/plain")
+
+    response.text = b"FAIL: Cross-domain access allowed."
diff --git a/test/wpt/tests/xhr/resources/access-control-basic-options-not-supported.py b/test/wpt/tests/xhr/resources/access-control-basic-options-not-supported.py
new file mode 100644
index 00000000000..bb3f63e311f
--- /dev/null
+++ b/test/wpt/tests/xhr/resources/access-control-basic-options-not-supported.py
@@ -0,0 +1,12 @@
+def main(request, response):
+    response.headers.set(b"Cache-Control", b"no-store")
+
+    # Allow simple requests, but deny preflight
+    if request.method != u"OPTIONS":
+        if b"origin" in request.headers:
+            response.headers.set(b"Access-Control-Allow-Credentials", b"true")
+            response.headers.set(b"Access-Control-Allow-Origin", request.headers[b"origin"])
+        else:
+            response.status = 500
+    else:
+        response.status = 400
diff --git a/test/wpt/tests/xhr/resources/access-control-basic-preflight-cache-invalidation.py b/test/wpt/tests/xhr/resources/access-control-basic-preflight-cache-invalidation.py
new file mode 100644
index 00000000000..f4f592dac79
--- /dev/null
+++ b/test/wpt/tests/xhr/resources/access-control-basic-preflight-cache-invalidation.py
@@ -0,0 +1,49 @@
+from wptserve.utils import isomorphic_encode
+
+def main(request, response):
+    def fail(message):
+        response.content = b"FAIL " + isomorphic_encode(request.method) + b": " + message
+
+    def getState(token):
+        server_state = request.server.stash.take(token)
+        if not server_state:
+            return b"Uninitialized"
+        return server_state
+
+    def setState(state, token):
+        request.server.stash.put(token, state)
+
+    response.headers.set(b"Access-Control-Allow-Origin", request.headers.get(b"origin"))
+    response.headers.set(b"Access-Control-Allow-Credentials", b"true")
+    token = request.GET.first(b"token", None)
+    state = getState(token)
+
+    if state == b"Uninitialized":
+        if request.method == u"OPTIONS":
+            response.headers.set(b"Access-Control-Allow-Methods", b"PUT")
+            response.headers.set(b"Access-Control-Max-Age", 10)
+            setState(b"OPTIONSSent", token)
+        else:
+            fail(state)
+    elif state == b"OPTIONSSent":
+        if request.method == u"PUT":
+            response.content = b"PASS: First PUT request."
+            setState(b"FirstPUTSent", token)
+        else:
+            fail(state)
+    elif state == b"FirstPUTSent":
+        if request.method == u"OPTIONS":
+            response.headers.set(b"Access-Control-Allow-Methods", b"PUT, XMETHOD")
+            response.headers.set(b"Access-Control-Allow-Headers", b"x-test")
+            setState(b"SecondOPTIONSSent", token)
+        elif request.method == u"PUT":
+            fail(b"Second PUT request sent without preflight")
+        else:
+            fail(state)
+    elif state == b"SecondOPTIONSSent":
+        if request.method == u"PUT" or request.method == u"XMETHOD":
+            response.content = b"PASS: Second OPTIONS request was sent."
+        else:
+            fail(state)
+    else:
+        fail(state)
diff --git a/test/wpt/tests/xhr/resources/access-control-basic-preflight-cache-timeout.py b/test/wpt/tests/xhr/resources/access-control-basic-preflight-cache-timeout.py
new file mode 100644
index 00000000000..00c319f082a
--- /dev/null
+++ b/test/wpt/tests/xhr/resources/access-control-basic-preflight-cache-timeout.py
@@ -0,0 +1,50 @@
+from wptserve.utils import isomorphic_encode
+
+def main(request, response):
+    def fail(message):
+        response.content = b"FAIL " + isomorphic_encode(request.method) + b": " + message
+
+    def getState(token):
+        server_state = request.server.stash.take(token)
+        if not server_state:
+            return b"Uninitialized"
+        return server_state
+
+    def setState(state, token):
+        request.server.stash.put(token, state)
+
+    response.headers.set(b"Access-Control-Allow-Origin", request.headers.get(b"origin"))
+    response.headers.set(b"Access-Control-Allow-Credentials", b"true")
+    token = request.GET.first(b"token", None)
+    state = getState(token)
+
+    if state == b"Uninitialized":
+        if request.method == u"OPTIONS":
+            response.headers.set(b"Access-Control-Allow-Methods", b"PUT")
+            response.headers.set(b"Access-Control-Allow-Headers", b"x-test")
+            response.headers.set(b"Access-Control-Max-Age", 1)
+            setState(b"OPTIONSSent", token)
+        else:
+            fail(state)
+    elif state == b"OPTIONSSent":
+        if request.method == u"PUT":
+            response.content = b"PASS: First PUT request."
+            setState(b"FirstPUTSent", token)
+        else:
+            fail(state)
+    elif state == b"FirstPUTSent":
+        if request.method == u"OPTIONS":
+            response.headers.set(b"Access-Control-Allow-Methods", b"PUT")
+            response.headers.set(b"Access-Control-Allow-Headers", b"x-test")
+            setState(b"SecondOPTIONSSent", token)
+        elif request.method == u"PUT":
+            fail(b"Second PUT request sent without preflight")
+        else:
+            fail(state)
+    elif state == b"SecondOPTIONSSent":
+        if request.method == u"PUT":
+            response.content = b"PASS: Second OPTIONS request was sent."
+        else:
+            fail(state)
+    else:
+        fail(state)
diff --git a/test/wpt/tests/xhr/resources/access-control-basic-preflight-cache.py b/test/wpt/tests/xhr/resources/access-control-basic-preflight-cache.py
new file mode 100644
index 00000000000..7a6bb60c01a
--- /dev/null
+++ b/test/wpt/tests/xhr/resources/access-control-basic-preflight-cache.py
@@ -0,0 +1,50 @@
+
+from wptserve.utils import isomorphic_encode
+
+def main(request, response):
+    def fail(message):
+        response.content = b"FAIL " + isomorphic_encode(request.method) + b": " + message
+        response.status = 400
+
+    def getState(token):
+        server_state = request.server.stash.take(token)
+        if not server_state:
+            return b"Uninitialized"
+        return server_state
+
+    def setState(state, token):
+        request.server.stash.put(token, state)
+
+    response.headers.set(b"Access-Control-Allow-Origin", request.headers.get(b"origin"))
+    response.headers.set(b"Access-Control-Allow-Credentials", b"true")
+    token = request.GET.first(b"token", None)
+    state = getState(token)
+
+    if state == b"Uninitialized":
+        if request.method == u"OPTIONS":
+            response.headers.set(b"Access-Control-Allow-Methods", b"PUT")
+            response.headers.set(b"Access-Control-Max-Age", 10)
+            setState(b"OPTIONSSent", token)
+        else:
+            fail(state)
+    elif state == b"OPTIONSSent":
+        if request.method == u"PUT":
+            response.content = b"PASS: First PUT request."
+            setState(b"FirstPUTSent", token)
+        else:
+            fail(state)
+    elif state == b"FirstPUTSent":
+        if request.method == u"PUT":
+            response.content = b"PASS: Second PUT request. Preflight worked."
+        elif request.method == u"OPTIONS":
+            response.headers.set(b"Access-Control-Allow-Methods", b"PUT")
+            setState(b"FAILSecondOPTIONSSent", token)
+        else:
+            fail(state)
+    elif state == b"FAILSecondOPTIONSSent":
+        if request.method == u"PUT":
+            fail(b"Second OPTIONS request was sent. Preflight failed.")
+        else:
+            fail(state)
+    else:
+        fail(state)
diff --git a/test/wpt/tests/xhr/resources/access-control-basic-put-allow.py b/test/wpt/tests/xhr/resources/access-control-basic-put-allow.py
new file mode 100644
index 00000000000..9b347bca423
--- /dev/null
+++ b/test/wpt/tests/xhr/resources/access-control-basic-put-allow.py
@@ -0,0 +1,22 @@
+from wptserve.utils import isomorphic_encode
+
+def main(request, response):
+    if request.method == u"OPTIONS":
+        response.headers.set(b"Content-Type", b"text/plain")
+        response.headers.set(b"Access-Control-Allow-Credentials", b"true")
+        response.headers.set(b"Access-Control-Allow-Methods", b"PUT")
+        response.headers.set(b"Access-Control-Allow-Origin", request.headers.get(b"origin"))
+
+    elif request.method == u"PUT":
+        response.headers.set(b"Content-Type", b"text/plain")
+        response.headers.set(b"Access-Control-Allow-Credentials", b"true")
+        response.headers.set(b"Access-Control-Allow-Origin", request.headers.get(b"origin"))
+        response.content = b"PASS: Cross-domain access allowed."
+        try:
+            response.content += b"\n" + request.body
+        except:
+            response.content += b"Could not read in content."
+
+    else:
+        response.headers.set(b"Content-Type", b"text/plain")
+        response.content = b"Wrong method: " + isomorphic_encode(request.method)
diff --git a/test/wpt/tests/xhr/resources/access-control-cookie.py b/test/wpt/tests/xhr/resources/access-control-cookie.py
new file mode 100644
index 00000000000..8c26475c387
--- /dev/null
+++ b/test/wpt/tests/xhr/resources/access-control-cookie.py
@@ -0,0 +1,16 @@
+import datetime
+
+def main(request, response):
+    cookie_name = request.GET.first(b"cookie_name", b"")
+
+    response.headers.set(b"Cache-Control", b"no-store")
+    response.headers.set(b"Access-Control-Allow-Origin", request.headers.get(b"origin"))
+    response.headers.set(b"Access-Control-Allow-Credentials", b"true")
+
+    for cookie in request.cookies:
+        # Set cookie to expire yesterday
+        response.set_cookie(cookie, b"deleted", expires=-datetime.timedelta(days=1))
+
+    if cookie_name:
+        # Set cookie to expire tomorrow
+        response.set_cookie(cookie_name, b"COOKIE", expires=datetime.timedelta(days=1))
diff --git a/test/wpt/tests/xhr/resources/access-control-origin-header.py b/test/wpt/tests/xhr/resources/access-control-origin-header.py
new file mode 100644
index 00000000000..65a2c64ca8c
--- /dev/null
+++ b/test/wpt/tests/xhr/resources/access-control-origin-header.py
@@ -0,0 +1,8 @@
+def main(request, response):
+    response.headers.set(b"Content-Type", b"text/plain")
+    response.headers.set(b"Cache-Control", b"no-cache, no-store")
+    response.headers.set(b"Access-Control-Allow-External", b"true")
+    response.headers.set(b"Access-Control-Allow-Origin", b"*")
+
+    response.content = b"PASS: Cross-domain access allowed.\n"
+    response.content += b"HTTP_ORIGIN: " + request.headers.get(b"origin")
diff --git a/test/wpt/tests/xhr/resources/access-control-preflight-denied.py b/test/wpt/tests/xhr/resources/access-control-preflight-denied.py
new file mode 100644
index 00000000000..1ec3037f36b
--- /dev/null
+++ b/test/wpt/tests/xhr/resources/access-control-preflight-denied.py
@@ -0,0 +1,49 @@
+def main(request, response):
+    def fail(message):
+        response.content = b"FAIL: " + message
+        response.status = 400
+
+    def getState(token):
+        server_state = request.server.stash.take(token)
+        if not server_state:
+            return b"Uninitialized"
+        return server_state
+
+    def setState(token, state):
+        request.server.stash.put(token, state)
+
+    def resetState(token):
+        setState(token, b"")
+
+    response.headers.set(b"Cache-Control", b"no-store")
+    response.headers.set(b"Access-Control-Allow-Origin", request.headers.get(b"origin"))
+    response.headers.set(b"Access-Control-Max-Age", 1)
+    token = request.GET.first(b"token", None)
+    state = getState(token)
+    command = request.GET.first(b"command", None)
+
+    if command == b"reset":
+        if request.method == u"GET":
+            resetState(token)
+            response.content = b"Server state reset"
+        else:
+            fail(b"Invalid Method.")
+    elif state == b"Uninitialized":
+        if request.method == u"OPTIONS":
+            response.content = b"This request should not be displayed."
+            setState(token, b"Denied")
+        else:
+            fail(state)
+    elif state == b"Denied":
+        if request.method == u"GET" and command == b"complete":
+            resetState(token)
+            response.content = b"Request successfully blocked."
+        else:
+            setState(token, b"Deny Ignored")
+            fail(b"The request was not denied.")
+    elif state == b"Deny Ignored":
+        resetState(token)
+        fail(state)
+    else:
+        resetState(token)
+        fail(b"Unknown Error.")
diff --git a/test/wpt/tests/xhr/resources/access-control-preflight-request-allow-headers-returns-star.py b/test/wpt/tests/xhr/resources/access-control-preflight-request-allow-headers-returns-star.py
new file mode 100644
index 00000000000..87d36160dff
--- /dev/null
+++ b/test/wpt/tests/xhr/resources/access-control-preflight-request-allow-headers-returns-star.py
@@ -0,0 +1,12 @@
+def main(request, response):
+    if request.method == "OPTIONS":
+        response.headers.set(b"Access-Control-Allow-Origin", b"*")
+        response.headers.set(b"Access-Control-Allow-Headers", b"*")
+        response.status = 200
+    elif request.method == "GET":
+        response.headers.set(b"Access-Control-Allow-Origin", b"*")
+        if request.headers.get(b"X-Test"):
+            response.headers.set(b"Content-Type", b"text/plain")
+            response.content = b"PASS"
+        else:
+            response.status = 400
diff --git a/test/wpt/tests/xhr/resources/access-control-preflight-request-header-lowercase.py b/test/wpt/tests/xhr/resources/access-control-preflight-request-header-lowercase.py
new file mode 100644
index 00000000000..e77fc9a7d2e
--- /dev/null
+++ b/test/wpt/tests/xhr/resources/access-control-preflight-request-header-lowercase.py
@@ -0,0 +1,16 @@
+def main(request, response):
+    response.headers.set(b"Cache-Control", b"no-store")
+    response.headers.set(b"Access-Control-Allow-Origin", b"*")
+    response.headers.set(b"Access-Control-Max-Age", 0)
+
+    if request.method == u"OPTIONS":
+        if b"x-test" in [header.strip(b" ") for header in
+                         request.headers.get(b"Access-Control-Request-Headers").split(b",")]:
+            response.headers.set(b"Access-Control-Allow-Headers", b"X-Test")
+        else:
+            response.status = 400
+    elif request.method == u"GET":
+        if request.headers.get(b"X-Test"):
+            response.content = b"PASS"
+        else:
+            response.status = 400
diff --git a/test/wpt/tests/xhr/resources/access-control-preflight-request-header-returns-origin.py b/test/wpt/tests/xhr/resources/access-control-preflight-request-header-returns-origin.py
new file mode 100644
index 00000000000..d2c6abe948d
--- /dev/null
+++ b/test/wpt/tests/xhr/resources/access-control-preflight-request-header-returns-origin.py
@@ -0,0 +1,12 @@
+def main(request, response):
+    if request.method == "OPTIONS":
+        response.headers.set(b"Access-Control-Allow-Origin", request.headers.get(b"origin"))
+        response.headers.set(b"Access-Control-Allow-Headers", b"X-Test")
+        response.status = 200
+    elif request.method == "GET":
+        response.headers.set(b"Access-Control-Allow-Origin", b"*")
+        if request.headers.get(b"X-Test"):
+            response.headers.set(b"Content-Type", b"text/plain")
+            response.content = "PASS"
+        else:
+            response.status = 400
diff --git a/test/wpt/tests/xhr/resources/access-control-preflight-request-header-sorted.py b/test/wpt/tests/xhr/resources/access-control-preflight-request-header-sorted.py
new file mode 100644
index 00000000000..4e708a9d6b5
--- /dev/null
+++ b/test/wpt/tests/xhr/resources/access-control-preflight-request-header-sorted.py
@@ -0,0 +1,18 @@
+def main(request, response):
+    response.headers.set(b'Cache-Control', b'no-store')
+    response.headers.set(b'Access-Control-Allow-Origin',
+                         request.headers.get(b'origin'))
+
+    headers = b'x-custom-s,x-custom-test,x-custom-u,x-custom-ua,x-custom-v'
+    if request.method == u'OPTIONS':
+        response.headers.set(b'Access-Control-Max-Age', b'0')
+        response.headers.set(b'Access-Control-Allow-Headers', headers)
+        # Access-Control-Request-Headers should be sorted.
+        if headers != request.headers.get(b'Access-Control-Request-Headers'):
+            response.status = 400
+    else:
+        if request.headers.get(b'x-custom-s'):
+            response.content = b'PASS'
+        else:
+            response.status = 400
+            response.content = b'FAIL'
diff --git a/test/wpt/tests/xhr/resources/access-control-preflight-request-headers-origin.py b/test/wpt/tests/xhr/resources/access-control-preflight-request-headers-origin.py
new file mode 100644
index 00000000000..b8fb22050aa
--- /dev/null
+++ b/test/wpt/tests/xhr/resources/access-control-preflight-request-headers-origin.py
@@ -0,0 +1,12 @@
+def main(request, response):
+    response.headers.set(b"Cache-Control", b"no-store")
+    response.headers.set(b"Access-Control-Allow-Origin", b"*")
+
+    if request.method == u"OPTIONS":
+        if b"origin" in request.headers.get(b"Access-Control-Request-Headers").lower():
+            response.status = 400
+            response.content = b"Error: 'origin' included in Access-Control-Request-Headers"
+        else:
+            response.headers.set(b"Access-Control-Allow-Headers", b"x-pass")
+    else:
+        response.content = request.headers.get(b"x-pass")
diff --git a/test/wpt/tests/xhr/resources/access-control-preflight-request-invalid-status.py b/test/wpt/tests/xhr/resources/access-control-preflight-request-invalid-status.py
new file mode 100644
index 00000000000..2a59059cc66
--- /dev/null
+++ b/test/wpt/tests/xhr/resources/access-control-preflight-request-invalid-status.py
@@ -0,0 +1,16 @@
+def main(request, response):
+    try:
+        code = int(request.GET.first(b"code", None))
+    except:
+        code = None
+
+    if request.method == u"OPTIONS":
+        if code:
+            response.status = code
+        response.headers.set(b"Access-Control-Max-Age", 1)
+        response.headers.set(b"Access-Control-Allow-Headers", b"x-pass")
+    else:
+        response.status = 200
+
+    response.headers.set(b"Cache-Control", b"no-store")
+    response.headers.set(b"Access-Control-Allow-Origin", request.headers.get(b"origin"))
diff --git a/test/wpt/tests/xhr/resources/access-control-preflight-request-must-not-contain-cookie.py b/test/wpt/tests/xhr/resources/access-control-preflight-request-must-not-contain-cookie.py
new file mode 100644
index 00000000000..89a0451dd4e
--- /dev/null
+++ b/test/wpt/tests/xhr/resources/access-control-preflight-request-must-not-contain-cookie.py
@@ -0,0 +1,12 @@
+def main(request, response):
+    if request.method == u"OPTIONS" and request.cookies.get(b"foo"):
+        response.status = 400
+    else:
+        response.headers.set(b"Cache-Control", b"no-store")
+        response.headers.set(b"Access-Control-Allow-Origin", request.headers.get(b"origin"))
+        response.headers.set(b"Access-Control-Allow-Credentials", b"true")
+        response.headers.set(b"Access-Control-Allow-Headers", b"X-Proprietary-Header")
+        response.headers.set(b"Connection", b"close")
+
+        if request.cookies.get(b"foo"):
+            response.content = request.cookies[b"foo"].value
diff --git a/test/wpt/tests/xhr/resources/access-control-sandboxed-iframe.html b/test/wpt/tests/xhr/resources/access-control-sandboxed-iframe.html
new file mode 100644
index 00000000000..7e47275b6ce
--- /dev/null
+++ b/test/wpt/tests/xhr/resources/access-control-sandboxed-iframe.html
@@ -0,0 +1,24 @@
+<!DOCTYPE html>
+<html>
+  <body>
+  <script type="text/javascript">
+window.addEventListener("message", (evt) => {
+  const url = evt.data;
+  const xhr = new XMLHttpRequest;
+
+  xhr.open("GET", url, false);
+
+  try {
+    xhr.send();
+  } catch(e) {
+    parent.postMessage("Exception thrown. Sandboxed iframe XHR access was denied in 'send'.", "*");
+    return;
+  }
+
+  parent.postMessage(xhr.responseText, "*");
+}, false);
+
+parent.postMessage("ready", "*");
+  </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/resources/auth1/auth.py b/test/wpt/tests/xhr/resources/auth1/auth.py
new file mode 100644
index 00000000000..db4f7bc4c9f
--- /dev/null
+++ b/test/wpt/tests/xhr/resources/auth1/auth.py
@@ -0,0 +1,12 @@
+import imp
+import os
+
+from wptserve.utils import isomorphic_decode
+
+here = os.path.dirname(os.path.abspath(isomorphic_decode(__file__)))
+
+def main(request, response):
+    auth = imp.load_source(u"", os.path.join(here,
+                                             u"..",
+                                             u"authentication.py"))
+    return auth.main(request, response)
diff --git a/test/wpt/tests/xhr/resources/auth10/auth.py b/test/wpt/tests/xhr/resources/auth10/auth.py
new file mode 100644
index 00000000000..db4f7bc4c9f
--- /dev/null
+++ b/test/wpt/tests/xhr/resources/auth10/auth.py
@@ -0,0 +1,12 @@
+import imp
+import os
+
+from wptserve.utils import isomorphic_decode
+
+here = os.path.dirname(os.path.abspath(isomorphic_decode(__file__)))
+
+def main(request, response):
+    auth = imp.load_source(u"", os.path.join(here,
+                                             u"..",
+                                             u"authentication.py"))
+    return auth.main(request, response)
diff --git a/test/wpt/tests/xhr/resources/auth11/auth.py b/test/wpt/tests/xhr/resources/auth11/auth.py
new file mode 100644
index 00000000000..db4f7bc4c9f
--- /dev/null
+++ b/test/wpt/tests/xhr/resources/auth11/auth.py
@@ -0,0 +1,12 @@
+import imp
+import os
+
+from wptserve.utils import isomorphic_decode
+
+here = os.path.dirname(os.path.abspath(isomorphic_decode(__file__)))
+
+def main(request, response):
+    auth = imp.load_source(u"", os.path.join(here,
+                                             u"..",
+                                             u"authentication.py"))
+    return auth.main(request, response)
diff --git a/test/wpt/tests/xhr/resources/auth2/auth.py b/test/wpt/tests/xhr/resources/auth2/auth.py
new file mode 100644
index 00000000000..db4f7bc4c9f
--- /dev/null
+++ b/test/wpt/tests/xhr/resources/auth2/auth.py
@@ -0,0 +1,12 @@
+import imp
+import os
+
+from wptserve.utils import isomorphic_decode
+
+here = os.path.dirname(os.path.abspath(isomorphic_decode(__file__)))
+
+def main(request, response):
+    auth = imp.load_source(u"", os.path.join(here,
+                                             u"..",
+                                             u"authentication.py"))
+    return auth.main(request, response)
diff --git a/test/wpt/tests/xhr/resources/auth2/corsenabled.py b/test/wpt/tests/xhr/resources/auth2/corsenabled.py
new file mode 100644
index 00000000000..bec6687dbe9
--- /dev/null
+++ b/test/wpt/tests/xhr/resources/auth2/corsenabled.py
@@ -0,0 +1,18 @@
+import imp
+import os
+
+from wptserve.utils import isomorphic_decode
+
+here = os.path.dirname(isomorphic_decode(__file__))
+
+def main(request, response):
+    response.headers.set(b'Access-Control-Allow-Origin', request.headers.get(b"origin"))
+    response.headers.set(b'Access-Control-Allow-Credentials', b'true')
+    response.headers.set(b'Access-Control-Allow-Methods', b'GET')
+    response.headers.set(b'Access-Control-Allow-Headers', b'authorization, x-user, x-pass')
+    response.headers.set(b'Access-Control-Expose-Headers', b'x-challenge, xhr-user, ses-user')
+    auth = imp.load_source(u"", os.path.abspath(os.path.join(here, os.pardir, u"authentication.py")))
+    if request.method == u"OPTIONS":
+        return b""
+    else:
+        return auth.main(request, response)
diff --git a/test/wpt/tests/xhr/resources/auth3/auth.py b/test/wpt/tests/xhr/resources/auth3/auth.py
new file mode 100644
index 00000000000..db4f7bc4c9f
--- /dev/null
+++ b/test/wpt/tests/xhr/resources/auth3/auth.py
@@ -0,0 +1,12 @@
+import imp
+import os
+
+from wptserve.utils import isomorphic_decode
+
+here = os.path.dirname(os.path.abspath(isomorphic_decode(__file__)))
+
+def main(request, response):
+    auth = imp.load_source(u"", os.path.join(here,
+                                             u"..",
+                                             u"authentication.py"))
+    return auth.main(request, response)
diff --git a/test/wpt/tests/xhr/resources/auth4/auth.py b/test/wpt/tests/xhr/resources/auth4/auth.py
new file mode 100644
index 00000000000..db4f7bc4c9f
--- /dev/null
+++ b/test/wpt/tests/xhr/resources/auth4/auth.py
@@ -0,0 +1,12 @@
+import imp
+import os
+
+from wptserve.utils import isomorphic_decode
+
+here = os.path.dirname(os.path.abspath(isomorphic_decode(__file__)))
+
+def main(request, response):
+    auth = imp.load_source(u"", os.path.join(here,
+                                             u"..",
+                                             u"authentication.py"))
+    return auth.main(request, response)
diff --git a/test/wpt/tests/xhr/resources/auth5/auth.py b/test/wpt/tests/xhr/resources/auth5/auth.py
new file mode 100644
index 00000000000..43b376e6e87
--- /dev/null
+++ b/test/wpt/tests/xhr/resources/auth5/auth.py
@@ -0,0 +1,15 @@
+from wptserve.utils import isomorphic_decode
+
+def main(request, response):
+    if request.auth.username == b'usr' and request.auth.password == b'secret':
+        response.headers.set(b'Content-type', b'text/plain')
+        content = b""
+    else:
+        response.status = 401
+        response.headers.set(b'Status', b'401 Authorization required')
+        response.headers.set(b'WWW-Authenticate', b'Basic realm="test"')
+        content = b'User name/password wrong or not given: '
+
+    content += b"%s\n%s" % (request.auth.username or b'',
+                            request.auth.password or b'')
+    return content
diff --git a/test/wpt/tests/xhr/resources/auth6/auth.py b/test/wpt/tests/xhr/resources/auth6/auth.py
new file mode 100644
index 00000000000..e18319e3de8
--- /dev/null
+++ b/test/wpt/tests/xhr/resources/auth6/auth.py
@@ -0,0 +1,15 @@
+from wptserve.utils import isomorphic_decode
+
+def main(request, response):
+    if request.auth.username == b'usr' and request.auth.password == b'secret':
+        response.headers.set(b'Content-type', b'text/plain')
+        content = b""
+    else:
+        response.status = 401
+        response.headers.set(b'Status', b'401 Authorization required')
+        response.headers.set(b'WWW-Authenticate', b'Basic realm="test"')
+        content = b'User name/password wrong or not given: '
+
+    content += b"%s\n%s" % (request.auth.username,
+                            request.auth.password)
+    return content
diff --git a/test/wpt/tests/xhr/resources/auth7/corsenabled.py b/test/wpt/tests/xhr/resources/auth7/corsenabled.py
new file mode 100644
index 00000000000..7a060627b70
--- /dev/null
+++ b/test/wpt/tests/xhr/resources/auth7/corsenabled.py
@@ -0,0 +1,20 @@
+import imp
+import os
+
+from wptserve.utils import isomorphic_decode
+
+here = os.path.dirname(isomorphic_decode(__file__))
+
+def main(request, response):
+    response.headers.set(b'Access-Control-Allow-Origin', request.headers.get(b"origin"))
+    response.headers.set(b'Access-Control-Allow-Credentials', b'true')
+    response.headers.set(b'Access-Control-Allow-Methods', b'GET')
+    response.headers.set(b'Access-Control-Allow-Headers', b'authorization, x-user, x-pass')
+    response.headers.set(b'Access-Control-Expose-Headers', b'x-challenge, xhr-user, ses-user')
+    auth = imp.load_source(u"", os.path.join(here,
+                                             os.pardir,
+                                             u"authentication.py"))
+    if request.method == u"OPTIONS":
+        return b""
+    else:
+        return auth.main(request, response)
diff --git a/test/wpt/tests/xhr/resources/auth8/corsenabled-no-authorize.py b/test/wpt/tests/xhr/resources/auth8/corsenabled-no-authorize.py
new file mode 100644
index 00000000000..af8e7c4c170
--- /dev/null
+++ b/test/wpt/tests/xhr/resources/auth8/corsenabled-no-authorize.py
@@ -0,0 +1,20 @@
+import imp
+import os
+
+from wptserve.utils import isomorphic_decode
+
+here = os.path.dirname(isomorphic_decode(__file__))
+
+def main(request, response):
+    response.headers.set(b'Access-Control-Allow-Origin', request.headers.get(b"origin"))
+    response.headers.set(b'Access-Control-Allow-Credentials', b'true')
+    response.headers.set(b'Access-Control-Allow-Methods', b'GET')
+    response.headers.set(b'Access-Control-Allow-Headers', b'x-user, x-pass')
+    response.headers.set(b'Access-Control-Expose-Headers', b'x-challenge, xhr-user, ses-user')
+    auth = imp.load_source(u"", os.path.join(here,
+                                             os.pardir,
+                                             u"authentication.py"))
+    if request.method == u"OPTIONS":
+        return b""
+    else:
+        return auth.main(request, response)
diff --git a/test/wpt/tests/xhr/resources/auth9/auth.py b/test/wpt/tests/xhr/resources/auth9/auth.py
new file mode 100644
index 00000000000..db4f7bc4c9f
--- /dev/null
+++ b/test/wpt/tests/xhr/resources/auth9/auth.py
@@ -0,0 +1,12 @@
+import imp
+import os
+
+from wptserve.utils import isomorphic_decode
+
+here = os.path.dirname(os.path.abspath(isomorphic_decode(__file__)))
+
+def main(request, response):
+    auth = imp.load_source(u"", os.path.join(here,
+                                             u"..",
+                                             u"authentication.py"))
+    return auth.main(request, response)
diff --git a/test/wpt/tests/xhr/resources/authentication.py b/test/wpt/tests/xhr/resources/authentication.py
new file mode 100644
index 00000000000..50b5c801d61
--- /dev/null
+++ b/test/wpt/tests/xhr/resources/authentication.py
@@ -0,0 +1,24 @@
+def main(request, response):
+    session_user = request.auth.username
+    session_pass = request.auth.password
+    expected_user_name = request.headers.get(b"X-User", None)
+
+    token = expected_user_name
+    if session_user is None and session_pass is None:
+        if token is not None and request.server.stash.take(token) is not None:
+            return b'FAIL (did not authorize)'
+        else:
+            if token is not None:
+                request.server.stash.put(token, b"1")
+            status = (401, b'Unauthorized')
+            headers = [(b'WWW-Authenticate', b'Basic realm="test"')]
+            return status, headers, b'FAIL (should be transparent)'
+    else:
+        if request.server.stash.take(token) == b"1":
+            challenge = b"DID"
+        else:
+            challenge = b"DID-NOT"
+        headers = [(b'XHR-USER', expected_user_name),
+                   (b'SES-USER', session_user),
+                   (b"X-challenge", challenge)]
+        return headers, session_user + b"\n" + session_pass
diff --git a/test/wpt/tests/xhr/resources/bad-chunk-encoding.py b/test/wpt/tests/xhr/resources/bad-chunk-encoding.py
new file mode 100644
index 00000000000..7ed0ad4ae11
--- /dev/null
+++ b/test/wpt/tests/xhr/resources/bad-chunk-encoding.py
@@ -0,0 +1,17 @@
+import time
+
+def main(request, response):
+    delay = 0.1
+    count = 5
+    time.sleep(delay)
+    response.headers.set(b"Transfer-Encoding", b"chunked")
+    response.headers.set(b"Content-Type", b"text/plain")
+    response.headers.set(b"X-Content-Type-Options", b"nosniff")
+    response.headers.set(b"Connection", b"close")
+    response.close_connection = True
+    response.write_status_headers()
+    time.sleep(delay)
+    for i in range(count):
+        response.writer.write_content(b"a\r\nTEST_CHUNK\r\n")
+        time.sleep(delay)
+    response.writer.write_content(b"garbage")
diff --git a/test/wpt/tests/xhr/resources/base.xml b/test/wpt/tests/xhr/resources/base.xml
new file mode 100644
index 00000000000..ed01aeceb5a
--- /dev/null
+++ b/test/wpt/tests/xhr/resources/base.xml
@@ -0,0 +1 @@
+<base xmlns="http://www.w3.org/1999/xhtml" href="https://example.com/"/>
diff --git a/test/wpt/tests/xhr/resources/chunked.py b/test/wpt/tests/xhr/resources/chunked.py
new file mode 100644
index 00000000000..6f67d9097f9
--- /dev/null
+++ b/test/wpt/tests/xhr/resources/chunked.py
@@ -0,0 +1,17 @@
+def main(request, response):
+    chunks = [b"First chunk\r\n",
+              b"Second chunk\r\n",
+              b"Yet another (third) chunk\r\n",
+              b"Yet another (fourth) chunk\r\n",
+             ]
+    response.headers.set(b"Transfer-Encoding", b"chunked")
+    response.headers.set(b"Trailer", b"X-Test-Me")
+    response.headers.set(b"Content-Type", b"text/plain")
+    response.write_status_headers()
+
+    for value in chunks:
+        response.writer.write(b"%x\r\n" % len(value))
+        response.writer.write(value)
+        response.writer.write(b"\r\n")
+    response.writer.write(b"0\r\n")
+    response.writer.write(b"X-Test-Me: Trailer header value\r\n\r\n")
diff --git a/test/wpt/tests/xhr/resources/conditional.py b/test/wpt/tests/xhr/resources/conditional.py
new file mode 100644
index 00000000000..2c248305e69
--- /dev/null
+++ b/test/wpt/tests/xhr/resources/conditional.py
@@ -0,0 +1,29 @@
+def main(request, response):
+    tag = request.GET.first(b"tag", None)
+    match = request.headers.get(b"If-None-Match", None)
+    date = request.GET.first(b"date", b"")
+    modified = request.headers.get(b"If-Modified-Since", None)
+    cors = request.GET.first(b"cors", None)
+
+    if request.method == u"OPTIONS":
+        response.headers.set(b"Access-Control-Allow-Origin", b"*")
+        response.headers.set(b"Access-Control-Allow-Headers", b"IF-NONE-MATCH")
+        return b""
+
+    if tag:
+        response.headers.set(b"ETag", b'"%s"' % tag)
+    elif date:
+        response.headers.set(b"Last-Modified", date)
+
+    if cors:
+        response.headers.set(b"Access-Control-Allow-Origin", b"*")
+
+    if ((match is not None and match == tag) or
+            (modified is not None and modified == date)):
+        response.status = (304, b"SUPERCOOL")
+        return b""
+    else:
+        if not cors:
+            response.headers.set(b"Access-Control-Allow-Origin", b"*")
+        response.headers.set(b"Content-Type", b"text/plain")
+        return b"MAYBE NOT"
diff --git a/test/wpt/tests/xhr/resources/content.py b/test/wpt/tests/xhr/resources/content.py
new file mode 100644
index 00000000000..764ca367bbc
--- /dev/null
+++ b/test/wpt/tests/xhr/resources/content.py
@@ -0,0 +1,20 @@
+from wptserve.utils import isomorphic_encode
+
+def main(request, response):
+    response_ctype = b''
+
+    if b"response_charset_label" in request.GET:
+        response_ctype = b";charset=" + request.GET.first(b"response_charset_label")
+
+    headers = [(b"Content-type", b"text/plain" + response_ctype),
+               (b"X-Request-Method", isomorphic_encode(request.method)),
+               (b"X-Request-Query", isomorphic_encode(request.url_parts.query) if request.url_parts.query else b"NO"),
+               (b"X-Request-Content-Length", request.headers.get(b"Content-Length", b"NO")),
+               (b"X-Request-Content-Type", request.headers.get(b"Content-Type", b"NO"))]
+
+    if b"content" in request.GET:
+        content = request.GET.first(b"content")
+    else:
+        content = request.body
+
+    return headers, content
diff --git a/test/wpt/tests/xhr/resources/corsenabled.py b/test/wpt/tests/xhr/resources/corsenabled.py
new file mode 100644
index 00000000000..aae19f18f3c
--- /dev/null
+++ b/test/wpt/tests/xhr/resources/corsenabled.py
@@ -0,0 +1,25 @@
+import time
+
+from wptserve.utils import isomorphic_encode
+
+def main(request, response):
+    headers = [(b"Access-Control-Allow-Origin", b"*"),
+               (b"Access-Control-Allow-Credentials", b"true"),
+               (b"Access-Control-Allow-Methods", b"GET, POST, PUT, FOO"),
+               (b"Access-Control-Allow-Headers", b"x-test, x-foo"),
+               (b"Access-Control-Expose-Headers", b"x-request-method, x-request-content-type, x-request-query, x-request-content-length, x-request-data")]
+
+    if b"delay" in request.GET:
+        delay = int(request.GET.first(b"delay"))
+        time.sleep(delay)
+
+    if b"safelist_content_type" in request.GET:
+        headers.append((b"Access-Control-Allow-Headers", b"content-type"))
+
+    headers.append((b"X-Request-Method", isomorphic_encode(request.method)))
+    headers.append((b"X-Request-Query", isomorphic_encode(request.url_parts.query) if request.url_parts.query else b"NO"))
+    headers.append((b"X-Request-Content-Length", request.headers.get(b"Content-Length", b"NO")))
+    headers.append((b"X-Request-Content-Type", request.headers.get(b"Content-Type", b"NO")))
+    headers.append((b"X-Request-Data", request.body))
+
+    return headers, b"Test"
diff --git a/test/wpt/tests/xhr/resources/delay.py b/test/wpt/tests/xhr/resources/delay.py
new file mode 100644
index 00000000000..61a0ed26884
--- /dev/null
+++ b/test/wpt/tests/xhr/resources/delay.py
@@ -0,0 +1,7 @@
+import time
+
+def main(request, response):
+    delay = float(request.GET.first(b"ms", 500))
+    time.sleep(delay / 1E3)
+
+    return [(b"Access-Control-Allow-Origin", b"*"), (b"Access-Control-Allow-Methods", b"YO"), (b"Content-type", b"text/plain")], b"TEST_DELAY"
diff --git a/test/wpt/tests/xhr/resources/echo-content-cors.py b/test/wpt/tests/xhr/resources/echo-content-cors.py
new file mode 100644
index 00000000000..4ffb3e72a55
--- /dev/null
+++ b/test/wpt/tests/xhr/resources/echo-content-cors.py
@@ -0,0 +1,23 @@
+def main(request, response):
+    headers = [(b"X-Request-Method", request.method),
+               (b"X-Request-Content-Length", request.headers.get(b"Content-Length", b"NO")),
+               (b"X-Request-Content-Type", request.headers.get(b"Content-Type", b"NO")),
+               (b"Access-Control-Allow-Credentials", b"true"),
+               # Avoid any kind of content sniffing on the response.
+               (b"Content-Type", b"text/plain")]
+
+    origin = request.GET.first(b"origin", request.headers.get(b"origin"))
+    if origin != None:
+        headers.append((b"Access-Control-Allow-Origin", origin))
+
+    request_headers = request.GET.first(b"origin", request.headers.get(b"access-control-request-headers"))
+    if request_headers != None:
+        headers.append((b"Access-Control-Allow-Headers", request_headers))
+
+    request_method = request.GET.first(b"origin", request.headers.get(b"access-control-request-method"))
+    if request_method != None:
+        headers.append((b"Access-Control-Allow-Methods", b"OPTIONS, " + request_method))
+
+    content = request.body
+
+    return headers, content
diff --git a/test/wpt/tests/xhr/resources/echo-content-type.py b/test/wpt/tests/xhr/resources/echo-content-type.py
new file mode 100644
index 00000000000..595c88f32a7
--- /dev/null
+++ b/test/wpt/tests/xhr/resources/echo-content-type.py
@@ -0,0 +1,6 @@
+def main(request, response):
+    response.headers.set(b"Content-Type", b"text/plain")
+    response.headers.set(b"Connection", b"close")
+    response.status = 200
+    response.content = request.headers.get(b"Content-Type")
+    response.close_connection = True
diff --git a/test/wpt/tests/xhr/resources/echo-headers.py b/test/wpt/tests/xhr/resources/echo-headers.py
new file mode 100644
index 00000000000..58a7ed5637f
--- /dev/null
+++ b/test/wpt/tests/xhr/resources/echo-headers.py
@@ -0,0 +1,7 @@
+def main(request, response):
+    response.writer.write_status(200)
+    response.writer.write_header(b"Content-Type", b"text/plain")
+    response.writer.write_header(b"Connection", b"close")
+    response.writer.end_headers()
+    response.writer.write(str(request.raw_headers))
+    response.close_connection = True
diff --git a/test/wpt/tests/xhr/resources/echo-method.py b/test/wpt/tests/xhr/resources/echo-method.py
new file mode 100644
index 00000000000..564c3db11f0
--- /dev/null
+++ b/test/wpt/tests/xhr/resources/echo-method.py
@@ -0,0 +1,16 @@
+# This handler is designed to verify that UAs correctly discard the body of
+# responses to HTTP HEAD requests. If the response body is written to a
+# separate TCP packet, then this behavior cannot be verified. This handler uses
+# the response writer to ensure that the body is transmitted in the same packet
+# as the headers. In this way, non-conforming UAs will consistently fail the
+# associated test.
+
+def main(request, response):
+    content = request.method
+
+    response.add_required_headers = False
+    response.writer.write(u'''HTTP/1.1 200 OK
+Content-type: text/plain
+Content-Length: {}
+
+{}'''.format(len(content), content))
diff --git a/test/wpt/tests/xhr/resources/empty-div-utf8-html.py b/test/wpt/tests/xhr/resources/empty-div-utf8-html.py
new file mode 100644
index 00000000000..5d4c936590c
--- /dev/null
+++ b/test/wpt/tests/xhr/resources/empty-div-utf8-html.py
@@ -0,0 +1,5 @@
+def main(request, response):
+    headers = [(b"Content-type", b"text/html;charset=utf-8")]
+    content = b"<!DOCTYPE html><div></div>"
+
+    return headers, content
diff --git a/test/wpt/tests/xhr/resources/folder.txt b/test/wpt/tests/xhr/resources/folder.txt
new file mode 100644
index 00000000000..fef12e21968
--- /dev/null
+++ b/test/wpt/tests/xhr/resources/folder.txt
@@ -0,0 +1 @@
+bottom
diff --git a/test/wpt/tests/xhr/resources/form.py b/test/wpt/tests/xhr/resources/form.py
new file mode 100644
index 00000000000..c592943b795
--- /dev/null
+++ b/test/wpt/tests/xhr/resources/form.py
@@ -0,0 +1,2 @@
+def main(request, response):
+    return b"id:%s;value:%s;" % (request.POST.first(b"id"), request.POST.first(b"value"))
diff --git a/test/wpt/tests/xhr/resources/get-set-cookie.py b/test/wpt/tests/xhr/resources/get-set-cookie.py
new file mode 100644
index 00000000000..234280d3530
--- /dev/null
+++ b/test/wpt/tests/xhr/resources/get-set-cookie.py
@@ -0,0 +1,18 @@
+import datetime
+
+def main(request, response):
+    response.headers.set(b"Content-type", b"text/plain")
+
+    # By default use a session cookie.
+    expiration = None
+    if request.GET.get(b"clear"):
+        # If deleting, expire yesterday.
+        expiration = -datetime.timedelta(days=1)
+
+    response.set_cookie(b"WK-test", b"1", expires=expiration)
+    response.set_cookie(b"WK-test-secure", b"1", secure=True,
+                        expires=expiration)
+    content = b""
+    for cookie in request.cookies:
+        content = content + b" " + cookie + b"=" + request.cookies.get(cookie).value
+    response.content = content
diff --git a/test/wpt/tests/xhr/resources/gzip.py b/test/wpt/tests/xhr/resources/gzip.py
new file mode 100644
index 00000000000..fd1ca926fb7
--- /dev/null
+++ b/test/wpt/tests/xhr/resources/gzip.py
@@ -0,0 +1,24 @@
+import gzip as gzip_module
+
+from io import BytesIO
+
+def main(request, response):
+    if b"content" in request.GET:
+        output = request.GET[b"content"]
+    else:
+        output = request.body
+
+    out = BytesIO()
+    with gzip_module.GzipFile(fileobj=out, mode="w") as f:
+        f.write(output)
+    output = out.getvalue()
+
+    headers = [(b"Content-type", b"text/plain"),
+               (b"Content-Encoding", b"gzip"),
+               (b"X-Request-Method", request.method),
+               (b"X-Request-Query", request.url_parts.query if request.url_parts.query else b"NO"),
+               (b"X-Request-Content-Length", request.headers.get(b"Content-Length", b"NO")),
+               (b"X-Request-Content-Type", request.headers.get(b"Content-Type", b"NO")),
+               (b"Content-Length", len(output))]
+
+    return headers, output
diff --git a/test/wpt/tests/xhr/resources/header-user-agent.py b/test/wpt/tests/xhr/resources/header-user-agent.py
new file mode 100644
index 00000000000..ac6af13afe0
--- /dev/null
+++ b/test/wpt/tests/xhr/resources/header-user-agent.py
@@ -0,0 +1,15 @@
+def main(request, response):
+    response.headers.set(b"Access-Control-Allow-Origin", b"*")
+    response.headers.set(b"Access-Control-Max-Age", 0)
+    response.headers.set(b'Access-Control-Allow-Headers', b"x-test")
+
+    if request.method == u"OPTIONS":
+        if not request.headers.get(b"User-Agent"):
+            response.content = b"FAIL: User-Agent header missing in preflight request."
+            response.status = 400
+    else:
+        if request.headers.get(b"User-Agent"):
+            response.content = b"PASS"
+        else:
+            response.content = b"FAIL: User-Agent header missing in request"
+            response.status = 400
diff --git a/test/wpt/tests/xhr/resources/headers.asis b/test/wpt/tests/xhr/resources/headers.asis
new file mode 100644
index 00000000000..69273ac87fe
--- /dev/null
+++ b/test/wpt/tests/xhr/resources/headers.asis
@@ -0,0 +1,6 @@
+HTTP/1.1 200 YAYAYAYA
+foo-TEST: 1
+FOO-test: 2
+__Custom: token
+ALSO-here: Mr. PB
+ewok: lego
diff --git a/test/wpt/tests/xhr/resources/headers.py b/test/wpt/tests/xhr/resources/headers.py
new file mode 100644
index 00000000000..00b37c62abc
--- /dev/null
+++ b/test/wpt/tests/xhr/resources/headers.py
@@ -0,0 +1,12 @@
+# -*- coding: utf-8 -*-
+
+def main(request, response):
+    response.headers.set(b"Content-Type", b"text/plain")
+    response.headers.set(b"X-Custom-Header", b"test")
+    response.headers.set(b"Set-Cookie", b"test")
+    response.headers.set(b"Set-Cookie2", b"test")
+    response.headers.set(b"X-Custom-Header-Empty", b"")
+    response.headers.set(b"X-Custom-Header-Comma", b"1")
+    response.headers.append(b"X-Custom-Header-Comma", b"2")
+    response.headers.set(b"X-Custom-Header-Bytes", u"…".encode("utf-8"))
+    return b"TEST"
diff --git a/test/wpt/tests/xhr/resources/image.gif b/test/wpt/tests/xhr/resources/image.gif
new file mode 100644
index 00000000000..6d1174af119
Binary files /dev/null and b/test/wpt/tests/xhr/resources/image.gif differ
diff --git a/test/wpt/tests/xhr/resources/img-utf8-html.py b/test/wpt/tests/xhr/resources/img-utf8-html.py
new file mode 100644
index 00000000000..3057674cb60
--- /dev/null
+++ b/test/wpt/tests/xhr/resources/img-utf8-html.py
@@ -0,0 +1,5 @@
+def main(request, response):
+    headers = [(b"Content-type", b"text/html;charset=utf-8")]
+    content = b"<img>foo"
+
+    return headers, content
diff --git a/test/wpt/tests/xhr/resources/img.jpg b/test/wpt/tests/xhr/resources/img.jpg
new file mode 100644
index 00000000000..7aa9362529c
Binary files /dev/null and b/test/wpt/tests/xhr/resources/img.jpg differ
diff --git a/test/wpt/tests/xhr/resources/infinite-redirects.py b/test/wpt/tests/xhr/resources/infinite-redirects.py
new file mode 100644
index 00000000000..a60942dd9a6
--- /dev/null
+++ b/test/wpt/tests/xhr/resources/infinite-redirects.py
@@ -0,0 +1,24 @@
+from wptserve.utils import isomorphic_encode
+
+def main(request, response):
+    location = u"%s://%s%s" % (request.url_parts.scheme,
+                               request.url_parts.netloc,
+                               request.url_parts.path)
+    page = u"alternate"
+    type = 302
+    mix = 0
+    if request.GET.first(b"page", None) == b"alternate":
+        page = u"default"
+
+    if request.GET.first(b"type", None) == b"301":
+        type = 301
+
+    if request.GET.first(b"mix", None) == b"1":
+        mix = 1
+        type = 302 if type == 301 else 301
+
+    new_location = u"%s?page=%s&type=%s&mix=%s" % (location, page, type, mix)
+    headers = [(b"Cache-Control", b"no-cache"),
+               (b"Pragma", b"no-cache"),
+               (b"Location", isomorphic_encode(new_location))]
+    return 301, headers, u"Hello guest. You have been redirected to " + new_location
diff --git a/test/wpt/tests/xhr/resources/init.htm b/test/wpt/tests/xhr/resources/init.htm
new file mode 100644
index 00000000000..6f936c4fb28
--- /dev/null
+++ b/test/wpt/tests/xhr/resources/init.htm
@@ -0,0 +1,20 @@
+<!doctype html>
+<html>
+  <head>
+    <title>support init file</title>
+  </head>
+  <body>
+    <script>
+      onload = function() {
+        // Run async, because navigations from inside onload can be a bit weird.
+        setTimeout(function() {
+          if (parent != window) {
+            parent.init()
+          } else {
+            opener.init();
+          }
+        }, 0);
+      }
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/resources/inspect-headers.py b/test/wpt/tests/xhr/resources/inspect-headers.py
new file mode 100644
index 00000000000..123d637134d
--- /dev/null
+++ b/test/wpt/tests/xhr/resources/inspect-headers.py
@@ -0,0 +1,36 @@
+from wptserve.utils import isomorphic_encode
+
+def get_response(raw_headers, filter_value, filter_name):
+    result = b""
+    # raw_headers.raw_items() returns the (name, value) header pairs as
+    # tuples of strings. Convert them to bytes before comparing.
+    # TODO: Get access to the raw headers, so that whitespace between
+    # name, ":" and value can also be checked:
+    # https://github.com/web-platform-tests/wpt/issues/28756
+    for field in raw_headers.raw_items():
+        name = isomorphic_encode(field[0])
+        value = isomorphic_encode(field[1])
+        if filter_value:
+            if value == filter_value:
+                result += name + b","
+        elif name.lower() == filter_name:
+            result += name + b": " + value + b"\n"
+    return result
+
+def main(request, response):
+    headers = []
+    if b"cors" in request.GET:
+        headers.append((b"Access-Control-Allow-Origin", b"*"))
+        headers.append((b"Access-Control-Allow-Credentials", b"true"))
+        headers.append((b"Access-Control-Allow-Methods", b"GET, POST, PUT, FOO"))
+        headers.append((b"Access-Control-Allow-Headers", b"x-test, x-foo"))
+        headers.append((
+            b"Access-Control-Expose-Headers",
+            b"x-request-method, x-request-content-type, x-request-query, x-request-content-length"))
+    headers.append((b"content-type", b"text/plain"))
+
+    filter_value = request.GET.first(b"filter_value", b"")
+    filter_name = request.GET.first(b"filter_name", b"").lower()
+    result = get_response(request.raw_headers, filter_value, filter_name)
+
+    return headers, result
diff --git a/test/wpt/tests/xhr/resources/invalid-utf8-html.py b/test/wpt/tests/xhr/resources/invalid-utf8-html.py
new file mode 100644
index 00000000000..825f2d835ad
--- /dev/null
+++ b/test/wpt/tests/xhr/resources/invalid-utf8-html.py
@@ -0,0 +1,5 @@
+def main(request, response):
+    headers = [(b"Content-type", b"text/html;charset=utf-8")]
+    content = b"\xff"
+
+    return headers, content
diff --git a/test/wpt/tests/xhr/resources/last-modified.py b/test/wpt/tests/xhr/resources/last-modified.py
new file mode 100644
index 00000000000..db08e4b16d7
--- /dev/null
+++ b/test/wpt/tests/xhr/resources/last-modified.py
@@ -0,0 +1,9 @@
+from wptserve.utils import isomorphic_decode, isomorphic_encode
+
+def main(request, response):
+    import datetime, os
+    srcpath = os.path.join(os.path.dirname(isomorphic_decode(__file__)), u"well-formed.xml")
+    srcmoddt = datetime.datetime.utcfromtimestamp(os.path.getmtime(srcpath))
+    response.headers.set(b"Last-Modified", isomorphic_encode(srcmoddt.strftime(u"%a, %d %b %Y %H:%M:%S GMT")))
+    response.headers.set(b"Content-Type", b"application/xml")
+    return open(srcpath, u"r").read()
diff --git a/test/wpt/tests/xhr/resources/no-custom-header-on-preflight.py b/test/wpt/tests/xhr/resources/no-custom-header-on-preflight.py
new file mode 100644
index 00000000000..835c12813dc
--- /dev/null
+++ b/test/wpt/tests/xhr/resources/no-custom-header-on-preflight.py
@@ -0,0 +1,27 @@
+def main(request, response):
+    def getState(token):
+        server_state = request.server.stash.take(token)
+        if not server_state:
+            return b"Uninitialized"
+        return server_state
+
+    def setState(state, token):
+        request.server.stash.put(token, state)
+
+    response.headers.set(b"Access-Control-Allow-Origin", b"*")
+    response.headers.set(b"Access-Control-Allow-Headers", b"x-test")
+    response.headers.set(b"Access-Control-Max-Age", 0)
+    token = request.GET.first(b"token", None)
+
+    if request.method == u"OPTIONS":
+        if request.headers.get(b"x-test"):
+            response.content = b"FAIL: Invalid header in preflight request."
+            response.status = 400
+        else:
+            setState(b"PASS", token)
+    else:
+        if request.headers.get(b"x-test"):
+            response.content = getState(token)
+        else:
+            response.content = b"FAIL: X-Test header missing in request"
+            response.status = 400
diff --git a/test/wpt/tests/xhr/resources/nocors/folder.txt b/test/wpt/tests/xhr/resources/nocors/folder.txt
new file mode 100644
index 00000000000..5257b481d17
--- /dev/null
+++ b/test/wpt/tests/xhr/resources/nocors/folder.txt
@@ -0,0 +1 @@
+not CORS-enabled
\ No newline at end of file
diff --git a/test/wpt/tests/xhr/resources/over-1-meg.txt b/test/wpt/tests/xhr/resources/over-1-meg.txt
new file mode 100644
index 00000000000..be47867c3f4
--- /dev/null
+++ b/test/wpt/tests/xhr/resources/over-1-meg.txt
@@ -0,0 +1 @@
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d
\ No newline at end of file
diff --git a/test/wpt/tests/xhr/resources/parse-headers.py b/test/wpt/tests/xhr/resources/parse-headers.py
new file mode 100644
index 00000000000..8520baad880
--- /dev/null
+++ b/test/wpt/tests/xhr/resources/parse-headers.py
@@ -0,0 +1,6 @@
+def main(request, response):
+    content = u""
+    if b"my-custom-header" in request.GET:
+        val = request.GET.first(b"my-custom-header")
+        response.headers.set(b"My-Custom-Header", val)
+    return content
diff --git a/test/wpt/tests/xhr/resources/pass.txt b/test/wpt/tests/xhr/resources/pass.txt
new file mode 100644
index 00000000000..7ef22e9a431
--- /dev/null
+++ b/test/wpt/tests/xhr/resources/pass.txt
@@ -0,0 +1 @@
+PASS
diff --git a/test/wpt/tests/xhr/resources/redirect-cors.py b/test/wpt/tests/xhr/resources/redirect-cors.py
new file mode 100644
index 00000000000..5d030a62277
--- /dev/null
+++ b/test/wpt/tests/xhr/resources/redirect-cors.py
@@ -0,0 +1,20 @@
+def main(request, response):
+    location = request.GET.first(b"location")
+
+    if request.method == u"OPTIONS":
+        if b"redirect_preflight" in request.GET:
+            response.status = 302
+            response.headers.set(b"Location", location)
+        else:
+            response.status = 200
+        response.headers.set(b"Access-Control-Allow-Methods", b"GET")
+        response.headers.set(b"Access-Control-Max-Age", 1)
+    elif request.method == u"GET":
+        response.status = 302
+        response.headers.set(b"Location", location)
+
+    if b"allow_origin" in request.GET:
+        response.headers.set(b"Access-Control-Allow-Origin", request.headers.get(b"origin"))
+
+    if b"allow_header" in request.GET:
+        response.headers.set(b"Access-Control-Allow-Headers", request.GET.first(b"allow_header"))
diff --git a/test/wpt/tests/xhr/resources/redirect.py b/test/wpt/tests/xhr/resources/redirect.py
new file mode 100644
index 00000000000..3839b635e02
--- /dev/null
+++ b/test/wpt/tests/xhr/resources/redirect.py
@@ -0,0 +1,16 @@
+import time
+
+from wptserve.utils import isomorphic_encode
+
+def main(request, response):
+    code = int(request.GET.first(b"code", 302))
+    location = request.GET.first(b"location", isomorphic_encode(request.url_parts.path + u"?followed"))
+
+    if b"delay" in request.GET:
+        delay = float(request.GET.first(b"delay"))
+        time.sleep(delay / 1E3)
+
+    if b"followed" in request.GET:
+        return [(b"Content:Type", b"text/plain")], b"MAGIC HAPPENED"
+    else:
+        return (code, b"WEBSRT MARKETING"), [(b"Location", location)], b"TEST"
diff --git a/test/wpt/tests/xhr/resources/requri.py b/test/wpt/tests/xhr/resources/requri.py
new file mode 100644
index 00000000000..c7f7330f11c
--- /dev/null
+++ b/test/wpt/tests/xhr/resources/requri.py
@@ -0,0 +1,5 @@
+def main(request, response):
+    if b"full" in request.GET:
+        return request.url
+    else:
+        return request.request_path
diff --git a/test/wpt/tests/xhr/resources/reset-token.py b/test/wpt/tests/xhr/resources/reset-token.py
new file mode 100644
index 00000000000..257c2aae80c
--- /dev/null
+++ b/test/wpt/tests/xhr/resources/reset-token.py
@@ -0,0 +1,5 @@
+def main(request, response):
+    response.headers.set(b"Access-Control-Allow-Origin", request.headers.get(b"origin"))
+    token = request.GET[b"token"]
+    request.server.stash.put(token, b"")
+    response.content = b"PASS"
diff --git a/test/wpt/tests/xhr/resources/responseType-document-in-worker.js b/test/wpt/tests/xhr/resources/responseType-document-in-worker.js
new file mode 100644
index 00000000000..37ba9bd13ee
--- /dev/null
+++ b/test/wpt/tests/xhr/resources/responseType-document-in-worker.js
@@ -0,0 +1,9 @@
+self.importScripts('/resources/testharness.js');
+
+test(function() {
+    let xhr = new XMLHttpRequest();
+    xhr.responseType = "document";
+    assert_not_equals(xhr.responseType, "document");
+}, "Setting XMLHttpRequest responseType to 'document' in a worker should have no effect.");
+
+done();
diff --git a/test/wpt/tests/xhr/resources/responseXML-unavailable-in-worker.js b/test/wpt/tests/xhr/resources/responseXML-unavailable-in-worker.js
new file mode 100644
index 00000000000..06da02a71f5
--- /dev/null
+++ b/test/wpt/tests/xhr/resources/responseXML-unavailable-in-worker.js
@@ -0,0 +1,9 @@
+self.importScripts('/resources/testharness.js');
+
+test(function() {
+    let xhr = new XMLHttpRequest();
+    assert_false(xhr.hasOwnProperty("responseXML"), "responseXML should not be available on instances.");
+    assert_false(XMLHttpRequest.prototype.hasOwnProperty("responseXML"), "responseXML should not be on the prototype.");
+}, "XMLHttpRequest's responseXML property should not be exposed in workers.");
+
+done();
diff --git a/test/wpt/tests/xhr/resources/send-after-setting-document-domain-window-1.htm b/test/wpt/tests/xhr/resources/send-after-setting-document-domain-window-1.htm
new file mode 100644
index 00000000000..4e4c3faff90
--- /dev/null
+++ b/test/wpt/tests/xhr/resources/send-after-setting-document-domain-window-1.htm
@@ -0,0 +1,23 @@
+<!doctype html>
+<html>
+  <head>
+    <title>XMLHttpRequest: send() with document.domain set: loading documents from original origin after setting document.domain</title>
+    <script src="send-after-setting-document-domain-window-helper.js"></script>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-open()-method" data-tested-assertations="following::ol[1]/li[2]/ol[1]/li[3]" />
+  </head>
+  <body>
+    <script>
+      run_test(function() {
+        document.domain = document.domain; // this is not a noop, it does actually change the security context
+        var client = new XMLHttpRequest();
+        client.open("GET", "status.py?content=hello", false);
+        client.send(null);
+        assert_equals(client.responseText, "hello");
+        document.domain = document.domain.replace(/^\w+\./, "");
+        client.open("GET", "status.py?content=hello2", false);
+        client.send(null);
+        assert_equals(client.responseText, "hello2");
+      }, "loading documents from original origin after setting document.domain");
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/resources/send-after-setting-document-domain-window-2.htm b/test/wpt/tests/xhr/resources/send-after-setting-document-domain-window-2.htm
new file mode 100644
index 00000000000..cd9f0c6bb70
--- /dev/null
+++ b/test/wpt/tests/xhr/resources/send-after-setting-document-domain-window-2.htm
@@ -0,0 +1,20 @@
+<!doctype html>
+<html>
+  <head>
+    <title>XMLHttpRequest: send() with document.domain set: loading documents from the origin document.domain was set to should throw</title>
+    <script src="send-after-setting-document-domain-window-helper.js"></script>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-open()-method" data-tested-assertations="following::ol[1]/li[2]/ol[1]/li[3]" />
+  </head>
+  <body>
+    <script>
+      run_test(function() {
+        document.domain = document.domain.replace(/^\w+\./, "");
+        var client = new XMLHttpRequest();
+        client.open("GET", location.protocol + "//" + document.domain + location.pathname.replace(/[^\/]*$/, "") + "status.py?content=hello3", false);
+        assert_throws_dom("NetworkError", function() {
+          client.send(null);
+        });
+      }, "loading documents from the origin document.domain was set to should throw");
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/resources/send-after-setting-document-domain-window-helper.js b/test/wpt/tests/xhr/resources/send-after-setting-document-domain-window-helper.js
new file mode 100644
index 00000000000..0c239cfdbcd
--- /dev/null
+++ b/test/wpt/tests/xhr/resources/send-after-setting-document-domain-window-helper.js
@@ -0,0 +1,32 @@
+function assert_equals(value, expected) {
+  if (value != expected) {
+    throw "Got wrong value.\nExpected '" + expected + "',\ngot '" + value + "'";
+  }
+}
+
+function assert_throws_dom(expected_exc, func) {
+  try {
+    func.call(this);
+  } catch(e) {
+    if (e.constructor.name != "DOMException") {
+      throw `Exception ${e.constructor.name || "unknown"} that was not a DOMException was thrown`;
+    }
+    var actual = e.name || e.type;
+    if (actual != expected_exc) {
+      throw "Got wrong exception.\nExpected '" + expected_exc + "',\ngot '" + actual + "'.";
+    }
+    return;
+  }
+  throw "Expected exception, but none was thrown";
+}
+
+function run_test(test, name) {
+  var result = {passed: true, message: null, name: name};
+  try {
+    test();
+  } catch(e) {
+    result.passed = false;
+    result.message = e + "";
+  }
+  opener.postMessage(result, "*");
+}
diff --git a/test/wpt/tests/xhr/resources/shift-jis-html.py b/test/wpt/tests/xhr/resources/shift-jis-html.py
new file mode 100644
index 00000000000..d8941e9b393
--- /dev/null
+++ b/test/wpt/tests/xhr/resources/shift-jis-html.py
@@ -0,0 +1,6 @@
+def main(request, response):
+    headers = [(b"Content-type", b"text/html;charset=shift-jis")]
+    # Shift-JIS bytes for katakana TE SU TO ('test')
+    content = bytes([0x83, 0x65, 0x83, 0x58, 0x83, 0x67])
+
+    return headers, content
diff --git a/test/wpt/tests/xhr/resources/status.py b/test/wpt/tests/xhr/resources/status.py
new file mode 100644
index 00000000000..05a59d5a637
--- /dev/null
+++ b/test/wpt/tests/xhr/resources/status.py
@@ -0,0 +1,11 @@
+from wptserve.utils import isomorphic_encode
+
+def main(request, response):
+    code = int(request.GET.first(b"code", 200))
+    text = request.GET.first(b"text", b"OMG")
+    content = request.GET.first(b"content", b"")
+    type = request.GET.first(b"type", b"")
+    status = (code, text)
+    headers = [(b"Content-Type", type),
+               (b"X-Request-Method", isomorphic_encode(request.method))]
+    return status, headers, content
diff --git a/test/wpt/tests/xhr/resources/top.txt b/test/wpt/tests/xhr/resources/top.txt
new file mode 100644
index 00000000000..83a3157d14d
--- /dev/null
+++ b/test/wpt/tests/xhr/resources/top.txt
@@ -0,0 +1 @@
+top
\ No newline at end of file
diff --git a/test/wpt/tests/xhr/resources/trickle.py b/test/wpt/tests/xhr/resources/trickle.py
new file mode 100644
index 00000000000..eab5310387e
--- /dev/null
+++ b/test/wpt/tests/xhr/resources/trickle.py
@@ -0,0 +1,15 @@
+import time
+
+def main(request, response):
+    chunk = b"TEST_TRICKLE\n"
+    delay = float(request.GET.first(b"ms", 500)) / 1E3
+    count = int(request.GET.first(b"count", 50))
+    if b"specifylength" in request.GET:
+        response.headers.set(b"Content-Length", count * len(chunk))
+    time.sleep(delay)
+    response.headers.set(b"Content-type", b"text/plain")
+    response.write_status_headers()
+    time.sleep(delay)
+    for i in range(count):
+        response.writer.write_content(chunk)
+        time.sleep(delay)
diff --git a/test/wpt/tests/xhr/resources/upload.py b/test/wpt/tests/xhr/resources/upload.py
new file mode 100644
index 00000000000..e35e46edcf9
--- /dev/null
+++ b/test/wpt/tests/xhr/resources/upload.py
@@ -0,0 +1,17 @@
+from wptserve.utils import isomorphic_encode
+
+def main(request, response):
+    content = []
+
+    for key, values in sorted(item for item in request.POST.items() if not hasattr(item[1][0], u"filename")):
+        content.append(b"%s=%s," % (key, values[0]))
+    content.append(b"\n")
+
+    for key, values in sorted(item for item in request.POST.items() if hasattr(item[1][0], u"filename")):
+        value = values[0]
+        content.append(b"%s=%s:%s:%d," % (key,
+                                          isomorphic_encode(value.filename),
+                                          isomorphic_encode(value.headers[u"Content-Type"]) if value.headers[u"Content-Type"] is not None else b"None",
+                                          len(value.file.read())))
+
+    return b"".join(content)
diff --git a/test/wpt/tests/xhr/resources/utf16.txt b/test/wpt/tests/xhr/resources/utf16.txt
new file mode 100644
index 00000000000..0085dfaee8d
Binary files /dev/null and b/test/wpt/tests/xhr/resources/utf16.txt differ
diff --git a/test/wpt/tests/xhr/resources/well-formed.xml b/test/wpt/tests/xhr/resources/well-formed.xml
new file mode 100644
index 00000000000..2f4f1269880
--- /dev/null
+++ b/test/wpt/tests/xhr/resources/well-formed.xml
@@ -0,0 +1,4 @@
+<html xmlns="http://www.w3.org/1999/xhtml">
+  <p id="n&#49;">1</p>
+  <p xmlns="namespacesarejuststrings" id="n2">2</p>
+</html>
diff --git a/test/wpt/tests/xhr/resources/win-1252-html.py b/test/wpt/tests/xhr/resources/win-1252-html.py
new file mode 100644
index 00000000000..0ef5283f7d5
--- /dev/null
+++ b/test/wpt/tests/xhr/resources/win-1252-html.py
@@ -0,0 +1,5 @@
+def main(request, response):
+    headers = [(b"Content-type", b"text/html;charset=windows-1252")]
+    content = chr(0xff)
+
+    return headers, content
diff --git a/test/wpt/tests/xhr/resources/win-1252-xml.py b/test/wpt/tests/xhr/resources/win-1252-xml.py
new file mode 100644
index 00000000000..e26c7f9ec0f
--- /dev/null
+++ b/test/wpt/tests/xhr/resources/win-1252-xml.py
@@ -0,0 +1,5 @@
+def main(request, response):
+    headers = [(b"Content-type", b"application/xml;charset=windows-1252")]
+    content = b'<\xff/>'
+
+    return headers, content
diff --git a/test/wpt/tests/xhr/resources/workerxhr-origin-referrer.js b/test/wpt/tests/xhr/resources/workerxhr-origin-referrer.js
new file mode 100644
index 00000000000..e378de28904
--- /dev/null
+++ b/test/wpt/tests/xhr/resources/workerxhr-origin-referrer.js
@@ -0,0 +1,63 @@
+importScripts("/resources/testharness.js")
+
+async_test(function() {
+    var expected = 'Referer: ' +
+                   location.href.replace(/[^/]*$/, '') +
+                   "workerxhr-origin-referrer.js\n"
+
+    var xhr = new XMLHttpRequest()
+    xhr.onreadystatechange = this.step_func(function() {
+        if (xhr.readyState == 4) {
+            assert_equals(xhr.responseText, expected)
+            this.done()
+        }
+    })
+    xhr.open('GET', 'inspect-headers.py?filter_name=referer', true)
+    xhr.send()
+}, 'Referer header')
+
+async_test(function() {
+    var expected = 'Origin: ' +
+                   location.protocol +
+                   '//' +
+                   location.hostname +
+                   (location.port === "" ? "" : ":" + location.port) +
+                   '\n'
+
+    var xhr = new XMLHttpRequest()
+    xhr.onreadystatechange = this.step_func(function() {
+        if (xhr.readyState == 4) {
+            assert_equals(xhr.responseText, expected)
+            this.done()
+        }
+    })
+    var url = location.protocol +
+              '//www2.' +
+              location.hostname +
+              (location.port === "" ? "" : ":" + location.port) +
+              location.pathname.replace(/[^/]*$/, '') +
+              'inspect-headers.py?filter_name=origin&cors'
+    xhr.open('GET', url, true)
+    xhr.send()
+}, 'Origin header')
+
+async_test(function() {
+    // If "origin" / base URL is the origin of this JS file, we can load files
+    // from the server it originates from.. and requri.py will be able to tell us
+    // what the requested URL was
+
+    var expected = location.href.replace(/[^/]*$/, '') +
+                   'requri.py?full'
+
+    var xhr = new XMLHttpRequest()
+    xhr.onreadystatechange = this.step_func(function() {
+        if (xhr.readyState == 4) {
+            assert_equals(xhr.responseText, expected)
+            this.done()
+        }
+    })
+    xhr.open('GET', 'requri.py?full', true)
+    xhr.send()
+}, 'Request URL test')
+
+done()
diff --git a/test/wpt/tests/xhr/resources/workerxhr-simple.js b/test/wpt/tests/xhr/resources/workerxhr-simple.js
new file mode 100644
index 00000000000..9bae5a5cabd
--- /dev/null
+++ b/test/wpt/tests/xhr/resources/workerxhr-simple.js
@@ -0,0 +1,9 @@
+var xhr=new XMLHttpRequest()
+xhr.onreadystatechange = function(){
+  if(xhr.readyState == 4){
+    var status = xhr.responseText === 'bottom\n' ? 'PASSED' : 'FAILED'
+    self.postMessage(status)
+  }
+}
+xhr.open('GET', 'folder.txt', true)
+xhr.send()
diff --git a/test/wpt/tests/xhr/resources/xmlhttprequest-event-order.js b/test/wpt/tests/xhr/resources/xmlhttprequest-event-order.js
new file mode 100644
index 00000000000..b6bb6cdf3c3
--- /dev/null
+++ b/test/wpt/tests/xhr/resources/xmlhttprequest-event-order.js
@@ -0,0 +1,83 @@
+(function(global) {
+  var recorded_xhr_events = [];
+
+  function record_xhr_event(e) {
+    var prefix = e.target instanceof XMLHttpRequestUpload ? "upload." : "";
+    recorded_xhr_events.push((prefix || "") + e.type + "(" + e.loaded + "," + e.total + "," + e.lengthComputable + ")");
+  }
+
+  global.prepare_xhr_for_event_order_test = function(xhr) {
+    xhr.addEventListener("readystatechange", function(e) {
+      recorded_xhr_events.push(xhr.readyState);
+    });
+    var events = ["loadstart", "progress", "abort", "timeout", "error", "load", "loadend"];
+    for(var i=0; i<events.length; ++i) {
+      xhr.addEventListener(events[i], record_xhr_event);
+    }
+    if ("upload" in xhr) {
+      for(var i=0; i<events.length; ++i) {
+        xhr.upload.addEventListener(events[i], record_xhr_event);
+      }
+    }
+  }
+
+  function getNextEvent(arr) {
+    var event = { str: arr.shift() };
+
+    // we can only handle strings, numbers (readystates) and undefined
+    if (event.str === undefined) {
+      return event;
+    }
+
+    if (typeof event.str !== "string") {
+      if (Number.isInteger(event.str)) {
+        event.state = event.str;
+        event.str = "readystatechange(" + event.str + ")";
+      } else {
+        throw "Test error: unexpected event type " + event.str;
+      }
+    }
+
+    // parse out the general type, loaded and total values
+    var type = event.type = event.str.split("(")[0].split(".").pop();
+    var loadedAndTotal = event.str.match(/.*\((\d+),(\d+),(true|false)\)/);
+    if (loadedAndTotal) {
+      event.loaded = parseInt(loadedAndTotal[1]);
+      event.total = parseInt(loadedAndTotal[2]);
+      event.lengthComputable = loadedAndTotal[3] == "true";
+    }
+
+    return event;
+  }
+
+  global.assert_xhr_event_order_matches = function(expected) {
+    var recorded = recorded_xhr_events;
+    var lastRecordedLoaded = -1;
+    while(expected.length && recorded.length) {
+      var currentExpected = getNextEvent(expected),
+          currentRecorded = getNextEvent(recorded);
+
+      // skip to the last progress event if we've hit one (note the next
+      // event after a progress event should be a LOADING readystatechange,
+      // if there are multiple progress events in a row).
+      while (recorded.length && currentRecorded.type == "progress" &&
+             parseInt(recorded) === 3) {
+        assert_greater_than(currentRecorded.loaded, lastRecordedLoaded,
+                            "progress event 'loaded' values must only increase");
+        lastRecordedLoaded = currentRecorded.loaded;
+      }
+      if (currentRecorded.type == "loadend") {
+        recordedProgressCount = 0;
+        lastRecordedLoaded = -1;
+      }
+
+      assert_equals(currentRecorded.str, currentExpected.str);
+    }
+    if (recorded.length) {
+      throw "\nUnexpected extra events: " + recorded.join(", ");
+    }
+    if (expected.length) {
+      throw "\nExpected more events: " + expected.join(", ");
+    }
+  }
+}(this));
diff --git a/test/wpt/tests/xhr/resources/xmlhttprequest-timeout-aborted.js b/test/wpt/tests/xhr/resources/xmlhttprequest-timeout-aborted.js
new file mode 100644
index 00000000000..dd0b6457854
--- /dev/null
+++ b/test/wpt/tests/xhr/resources/xmlhttprequest-timeout-aborted.js
@@ -0,0 +1,15 @@
+if (this.document === undefined)
+  importScripts("xmlhttprequest-timeout.js");
+/*
+This sets up three requests:
+The first request will only be open()ed, not aborted, timeout will be TIME_REGULAR_TIMEOUT but will never triggered because send() isn't called.
+After TIME_NORMAL_LOAD, the test asserts that no load/error/timeout/abort events fired
+
+Second request will be aborted immediately after send(), test asserts that abort fired
+
+Third request is set up to call abort() after TIME_NORMAL_LOAD, but it also has a TIME_REGULAR_TIMEOUT timeout. Asserts that timeout fired.
+(abort() is called later and should not fire an abort event per spec. This is untested!)
+*/
+runTestRequests([ ["AbortedRequest", false, "only open()ed, not aborted"],
+                  ["AbortedRequest", true, "aborted immediately after send()", -1],
+                  ["AbortedRequest", true, "call abort() after TIME_NORMAL_LOAD", TIME_NORMAL_LOAD] ]);
diff --git a/test/wpt/tests/xhr/resources/xmlhttprequest-timeout-abortedonmain.js b/test/wpt/tests/xhr/resources/xmlhttprequest-timeout-abortedonmain.js
new file mode 100644
index 00000000000..97477f97f8f
--- /dev/null
+++ b/test/wpt/tests/xhr/resources/xmlhttprequest-timeout-abortedonmain.js
@@ -0,0 +1,8 @@
+/*
+This test sets up two requests:
+one that gets abort()ed from a 0ms timeout (0ms will obviously be clamped to whatever the implementation's minimal value is), asserts abort event fires
+one that will be aborted after TIME_DELAY, (with a timeout at TIME_REGULAR_TIMEOUT) asserts abort event fires. Does not assert that the timeout event does *not* fire.
+*/
+
+runTestRequests([ ["AbortedRequest", true, "abort() from a 0ms timeout", 0],
+                  ["AbortedRequest", true, "aborted after TIME_DELAY", TIME_DELAY] ]);
diff --git a/test/wpt/tests/xhr/resources/xmlhttprequest-timeout-overrides.js b/test/wpt/tests/xhr/resources/xmlhttprequest-timeout-overrides.js
new file mode 100644
index 00000000000..be8e4a95503
--- /dev/null
+++ b/test/wpt/tests/xhr/resources/xmlhttprequest-timeout-overrides.js
@@ -0,0 +1,12 @@
+if (this.document === undefined)
+  importScripts("xmlhttprequest-timeout.js");
+/*
+Sets up three requests to a resource that will take 0.6 seconds to load:
+1) timeout first set to TIME_NORMAL_LOAD, after TIME_REGULAR_TIMEOUT timeout is set to 0, asserts load fires
+2) timeout first set to TIME_NORMAL_LOAD, after TIME_DELAY timeout is set to TIME_REGULAR_TIMEOUT, asserts load fires (race condition..?!?)
+3) timeout first set to 0, after TIME_REGULAR_TIMEOUT it is set to TIME_REGULAR_TIMEOUT * 10, asserts load fires
+*/
+
+runTestRequests([ ["RequestTracker", true, "timeout disabled after initially set", TIME_NORMAL_LOAD, TIME_REGULAR_TIMEOUT, 0],
+                  ["RequestTracker", true, "timeout overrides load after a delay", TIME_NORMAL_LOAD, TIME_DELAY, TIME_REGULAR_TIMEOUT],
+                  ["RequestTracker", true, "timeout enabled after initially disabled", 0, TIME_REGULAR_TIMEOUT, TIME_NORMAL_LOAD * 10] ]);
diff --git a/test/wpt/tests/xhr/resources/xmlhttprequest-timeout-overridesexpires.js b/test/wpt/tests/xhr/resources/xmlhttprequest-timeout-overridesexpires.js
new file mode 100644
index 00000000000..5151b5d5610
--- /dev/null
+++ b/test/wpt/tests/xhr/resources/xmlhttprequest-timeout-overridesexpires.js
@@ -0,0 +1,12 @@
+if (this.document === undefined)
+  importScripts("xmlhttprequest-timeout.js");
+/*
+        Starts three requests:
+        1) XHR to resource which will take a least TIME_XHR_LOAD ms with timeout initially set to TIME_NORMAL_LOAD ms. After TIME_LATE_TIMEOUT ms timeout is supposedly reset to TIME_DELAY ms,
+           but the resource should have finished loading already. Asserts "load" fires.
+        2) XHR with initial timeout set to TIME_NORMAL_LOAD, after TIME_REGULAR_TIMEOUT sets timeout to TIME_DELAY+100. Asserts "timeout" fires.
+        3) XHR with initial timeout set to TIME_DELAY, after TIME_REGULAR_TIMEOUT sets timeout to 500ms. Asserts "timeout" fires (the change happens when timeout already fired and the request is done).
+*/
+runTestRequests([ ["RequestTracker", true, "timeout set to expiring value after load fires", TIME_NORMAL_LOAD, TIME_LATE_TIMEOUT, TIME_DELAY],
+                  ["RequestTracker", true, "timeout set to expired value before load fires", TIME_NORMAL_LOAD, TIME_REGULAR_TIMEOUT, TIME_DELAY+100],
+                  ["RequestTracker", true, "timeout set to non-expiring value after timeout fires", TIME_DELAY, TIME_REGULAR_TIMEOUT, 500] ]);
diff --git a/test/wpt/tests/xhr/resources/xmlhttprequest-timeout-runner.js b/test/wpt/tests/xhr/resources/xmlhttprequest-timeout-runner.js
new file mode 100644
index 00000000000..151226a94fb
--- /dev/null
+++ b/test/wpt/tests/xhr/resources/xmlhttprequest-timeout-runner.js
@@ -0,0 +1,21 @@
+
+function testResultCallbackHandler(event) {
+    if (event.data == "done") {
+        done();
+        return;
+    }
+    if (event.data.type == "is") {
+        test(function() { assert_equals(event.data.got, event.data.expected); }, "Timeout test: " + event.data.msg);
+        return;
+    }
+    if (event.data.type == "ok") {
+        test(function() { assert_true(event.data.bool); }, "Timeout test: " + event.data.msg);
+        return;
+    }
+}
+
+window.addEventListener("message", testResultCallbackHandler);
+
+// Setting up testharness.js
+setup({ explicit_done: true });
+
diff --git a/test/wpt/tests/xhr/resources/xmlhttprequest-timeout-simple.js b/test/wpt/tests/xhr/resources/xmlhttprequest-timeout-simple.js
new file mode 100644
index 00000000000..ed45c8197db
--- /dev/null
+++ b/test/wpt/tests/xhr/resources/xmlhttprequest-timeout-simple.js
@@ -0,0 +1,6 @@
+if (this.document === undefined)
+  importScripts("xmlhttprequest-timeout.js");
+
+runTestRequests([ ["RequestTracker", true, "no time out scheduled, load fires normally", 0],
+                  ["RequestTracker", true, "load fires normally", TIME_NORMAL_LOAD],
+                  ["RequestTracker", true, "timeout hit before load", TIME_REGULAR_TIMEOUT] ]);
diff --git a/test/wpt/tests/xhr/resources/xmlhttprequest-timeout-synconmain.js b/test/wpt/tests/xhr/resources/xmlhttprequest-timeout-synconmain.js
new file mode 100644
index 00000000000..e77d25b9032
--- /dev/null
+++ b/test/wpt/tests/xhr/resources/xmlhttprequest-timeout-synconmain.js
@@ -0,0 +1,2 @@
+runTestRequests([ ["SyncRequestSettingTimeoutAfterOpen", null, "timeout after open"],
+                  ["SyncRequestSettingTimeoutBeforeOpen", null, "timeout before open"] ]);
diff --git a/test/wpt/tests/xhr/resources/xmlhttprequest-timeout-synconworker.js b/test/wpt/tests/xhr/resources/xmlhttprequest-timeout-synconworker.js
new file mode 100644
index 00000000000..a3b56c8297c
--- /dev/null
+++ b/test/wpt/tests/xhr/resources/xmlhttprequest-timeout-synconworker.js
@@ -0,0 +1,11 @@
+if (this.document === undefined){
+  importScripts("xmlhttprequest-timeout.js");
+}else{
+  throw "This test expects to be run as a Worker";
+}
+
+/* NOT TESTED: setting timeout before calling open( ... , false) in a worker context. The test code always calls open() first. */
+
+runTestRequests([ ["RequestTracker", false, "no time out scheduled, load fires normally", 0],
+                  ["RequestTracker", false, "load fires normally", TIME_NORMAL_LOAD],
+                  ["RequestTracker", false, "timeout hit before load", TIME_REGULAR_TIMEOUT] ]);
diff --git a/test/wpt/tests/xhr/resources/xmlhttprequest-timeout-twice.js b/test/wpt/tests/xhr/resources/xmlhttprequest-timeout-twice.js
new file mode 100644
index 00000000000..31111b6d5e9
--- /dev/null
+++ b/test/wpt/tests/xhr/resources/xmlhttprequest-timeout-twice.js
@@ -0,0 +1,6 @@
+if (this.document === undefined)
+  importScripts("xmlhttprequest-timeout.js");
+
+runTestRequests([ ["RequestTracker", true, "load fires normally with no timeout set, twice", 0, TIME_REGULAR_TIMEOUT, 0],
+                  ["RequestTracker", true, "load fires normally with same timeout set twice", TIME_NORMAL_LOAD, TIME_REGULAR_TIMEOUT, TIME_NORMAL_LOAD],
+                  ["RequestTracker", true, "timeout fires normally with same timeout set twice", TIME_REGULAR_TIMEOUT, TIME_DELAY, TIME_REGULAR_TIMEOUT] ]);
diff --git a/test/wpt/tests/xhr/resources/xmlhttprequest-timeout.js b/test/wpt/tests/xhr/resources/xmlhttprequest-timeout.js
new file mode 100644
index 00000000000..9375bab7f3b
--- /dev/null
+++ b/test/wpt/tests/xhr/resources/xmlhttprequest-timeout.js
@@ -0,0 +1,333 @@
+/* Test adapted from Alex Vincent's XHR2 timeout tests, written for Mozilla.
+   https://hg.mozilla.org/mozilla-central/file/tip/content/base/test/
+   Released into the public domain or under BSD, according to
+   https://bugzilla.mozilla.org/show_bug.cgi?id=525816#c86
+*/
+
+/* Notes:
+   - All times are expressed in milliseconds in this test suite.
+   - Test harness code is at the end of this file.
+   - We generate only one request at a time, to avoid overloading the HTTP
+   request handlers.
+ */
+
+var TIME_NORMAL_LOAD = 5000;
+var TIME_LATE_TIMEOUT = 4000;
+var TIME_XHR_LOAD = 3000;
+var TIME_REGULAR_TIMEOUT = 2000;
+var TIME_SYNC_TIMEOUT = 1000;
+var TIME_DELAY = 1000;
+
+/*
+ * This should point to a resource that responds with a text/plain resource after a delay of TIME_XHR_LOAD milliseconds.
+ */
+var STALLED_REQUEST_URL = "delay.py?ms=" + (TIME_XHR_LOAD);
+
+var inWorker = false;
+try {
+  inWorker = !(self instanceof Window);
+} catch (e) {
+  inWorker = true;
+}
+
+if (!inWorker)
+  STALLED_REQUEST_URL = "resources/" + STALLED_REQUEST_URL;
+
+function message(obj) {
+  if (inWorker)
+    self.postMessage(obj);
+  else
+    self.postMessage(obj, "*");
+}
+
+function is(got, expected, msg) {
+  var obj = {};
+  obj.type = "is";
+  obj.got = got;
+  obj.expected = expected;
+  obj.msg = msg;
+
+  message(obj);
+}
+
+function ok(bool, msg) {
+  var obj = {};
+  obj.type = "ok";
+  obj.bool = bool;
+  obj.msg = msg;
+
+  message(obj);
+}
+
+/**
+ * Generate and track results from a XMLHttpRequest with regards to timeouts.
+ *
+ * @param {String} id         The test description.
+ * @param {Number} timeLimit  The initial setting for the request timeout.
+ * @param {Number} resetAfter (Optional) The time after sending the request, to
+ *                            reset the timeout.
+ * @param {Number} resetTo    (Optional) The delay to reset the timeout to.
+ *
+ * @note The actual testing takes place in handleEvent(event).
+ * The requests are generated in startXHR().
+ *
+ * @note If resetAfter and resetTo are omitted, only the initial timeout setting
+ * applies.
+ *
+ * @constructor
+ * @implements DOMEventListener
+ */
+function RequestTracker(async, id, timeLimit /*[, resetAfter, resetTo]*/) {
+  this.async = async;
+  this.id = id;
+  this.timeLimit = timeLimit;
+
+  if (arguments.length > 3) {
+    this.mustReset  = true;
+    this.resetAfter = arguments[3];
+    this.resetTo    = arguments[4];
+  }
+
+  this.hasFired = false;
+}
+RequestTracker.prototype = {
+  /**
+   * Start the XMLHttpRequest!
+   */
+  startXHR: function() {
+    var req = new XMLHttpRequest();
+    this.request = req;
+    req.open("GET", STALLED_REQUEST_URL, this.async);
+    var me = this;
+    function handleEvent(e) { return me.handleEvent(e); };
+    req.onerror = handleEvent;
+    req.onload = handleEvent;
+    req.onabort = handleEvent;
+    req.ontimeout = handleEvent;
+
+    req.timeout = this.timeLimit;
+
+    if (this.mustReset) {
+      var resetTo = this.resetTo;
+      self.setTimeout(function() {
+        req.timeout = resetTo;
+      }, this.resetAfter);
+    }
+
+    try {
+      req.send(null);
+    }
+    catch (e) {
+      // Synchronous case in workers.
+      ok(!this.async && this.timeLimit < TIME_XHR_LOAD && e.name == "TimeoutError", "Unexpected error: " + e);
+      TestCounter.testComplete();
+    }
+  },
+
+  /**
+   * Get a message describing this test.
+   *
+   * @returns {String} The test description.
+   */
+  getMessage: function() {
+    var rv = this.id + ", ";
+    if (this.mustReset) {
+      rv += "original timeout at " + this.timeLimit + ", ";
+      rv += "reset at " + this.resetAfter + " to " + this.resetTo;
+    }
+    else {
+      rv += "timeout scheduled at " + this.timeLimit;
+    }
+    return rv;
+  },
+
+  /**
+   * Check the event received, and if it's the right (and only) one we get.
+   *
+   * @param {DOMProgressEvent} evt An event of type "load" or "timeout".
+   */
+  handleEvent: function(evt) {
+    if (this.hasFired) {
+      ok(false, "Only one event should fire: " + this.getMessage());
+      return;
+    }
+    this.hasFired = true;
+
+    var type = evt.type, expectedType;
+    // The XHR responds after TIME_XHR_LOAD milliseconds with a load event.
+    var timeLimit = this.mustReset && (this.resetAfter < Math.min(TIME_XHR_LOAD, this.timeLimit)) ?
+                    this.resetTo :
+                    this.timeLimit;
+    if ((timeLimit == 0) || (timeLimit >= TIME_XHR_LOAD)) {
+      expectedType = "load";
+    }
+    else {
+      expectedType = "timeout";
+    }
+    is(type, expectedType, this.getMessage());
+    TestCounter.testComplete();
+  }
+};
+
+/**
+ * Generate and track XMLHttpRequests which will have abort() called on.
+ *
+ * @param shouldAbort {Boolean} True if we should call abort at all.
+ * @param abortDelay  {Number}  The time in ms to wait before calling abort().
+ */
+function AbortedRequest(shouldAbort, id, abortDelay) {
+  this.shouldAbort = shouldAbort;
+  this.abortDelay  = abortDelay;
+  this.hasFired    = false;
+}
+AbortedRequest.prototype = {
+  /**
+   * Start the XMLHttpRequest!
+   */
+  startXHR: function() {
+    var req = new XMLHttpRequest();
+    this.request = req;
+    req.open("GET", STALLED_REQUEST_URL);
+    var _this = this;
+    function handleEvent(e) { return _this.handleEvent(e); };
+    req.onerror = handleEvent;
+    req.onload = handleEvent;
+    req.onabort = handleEvent;
+    req.ontimeout = handleEvent;
+
+    req.timeout = TIME_REGULAR_TIMEOUT;
+
+    function abortReq() {
+      req.abort();
+    }
+
+    if (!this.shouldAbort) {
+      self.setTimeout(function() {
+        try {
+          _this.noEventsFired();
+        }
+        catch (e) {
+          ok(false, "Unexpected error: " + e);
+          TestCounter.testComplete();
+        }
+      }, TIME_NORMAL_LOAD);
+    }
+    else {
+      // Abort events can only be triggered on sent requests.
+      req.send();
+      if (this.abortDelay == -1) {
+        abortReq();
+      }
+      else {
+        self.setTimeout(abortReq, this.abortDelay);
+      }
+    }
+  },
+
+  /**
+   * Ensure that no events fired at all, especially not our timeout event.
+   */
+  noEventsFired: function() {
+    ok(!this.hasFired, "No events should fire for an unsent, unaborted request");
+    // We're done; if timeout hasn't fired by now, it never will.
+    TestCounter.testComplete();
+  },
+
+  /**
+   * Get a message describing this test.
+   *
+   * @returns {String} The test description.
+   */
+  getMessage: function() {
+    return "time to abort is " + this.abortDelay + ", timeout set at " + TIME_REGULAR_TIMEOUT;
+  },
+
+  /**
+   * Check the event received, and if it's the right (and only) one we get.
+   *
+   * WebKit fires abort events even for DONE and UNSENT states, which is
+   * discussed in http://webkit.org/b/98404
+   * That's why we chose to accept secondary "abort" events in this test.
+   *
+   * @param {DOMProgressEvent} evt An event of type "load" or "timeout".
+   */
+  handleEvent: function(evt) {
+    if (this.hasFired && evt.type != "abort") {
+      ok(false, "Only abort event should fire: " + this.getMessage());
+      return;
+    }
+
+    var expectedEvent = (this.abortDelay >= TIME_REGULAR_TIMEOUT && !this.hasFired) ? "timeout" : "abort";
+    this.hasFired = true;
+    is(evt.type, expectedEvent, this.getMessage());
+    TestCounter.testComplete();
+  }
+};
+
+function SyncRequestSettingTimeoutAfterOpen() {
+  this.startXHR = function() {
+    var pass = false;
+    var req = new XMLHttpRequest();
+    req.open("GET", STALLED_REQUEST_URL, false);
+    try {
+      req.timeout = TIME_SYNC_TIMEOUT;
+    }
+    catch (e) {
+      pass = true;
+    }
+    ok(pass, "Synchronous XHR must not allow a timeout to be set - setting timeout must throw");
+    TestCounter.testComplete();
+  };
+  return this;
+};
+
+function SyncRequestSettingTimeoutBeforeOpen() {
+  this.startXHR = function() {
+    var pass = false;
+    var req = new XMLHttpRequest();
+    req.timeout = TIME_SYNC_TIMEOUT;
+    try {
+      req.open("GET", STALLED_REQUEST_URL, false);
+    }
+    catch (e) {
+      pass = true;
+    }
+    ok(pass, "Synchronous XHR must not allow a timeout to be set - calling open() after timeout is set must throw");
+    TestCounter.testComplete();
+  }
+  return this;
+};
+
+var TestRequests = [];
+
+// This code controls moving from one test to another.
+var TestCounter = {
+  testComplete: function() {
+    // Allow for the possibility there are other events coming.
+    self.setTimeout(function() {
+      TestCounter.next();
+    }, TIME_NORMAL_LOAD);
+  },
+
+  next: function() {
+    var test = TestRequests.shift();
+
+    if (test) {
+      test.startXHR();
+    }
+    else {
+      message("done");
+    }
+  }
+};
+
+function runTestRequests(testRequests) {
+  if (location.search) {
+    testRequests = testRequests.filter(test => test[2] == decodeURIComponent(location.search.substr(1)));
+  }
+  TestRequests = testRequests.map(test => {
+    var constructor = test.shift();
+    return new self[constructor](...test)
+  });
+  TestCounter.next();
+}
diff --git a/test/wpt/tests/xhr/resources/zlib.py b/test/wpt/tests/xhr/resources/zlib.py
new file mode 100644
index 00000000000..638813999ce
--- /dev/null
+++ b/test/wpt/tests/xhr/resources/zlib.py
@@ -0,0 +1,19 @@
+import zlib
+
+def main(request, response):
+    if b"content" in request.GET:
+        output = request.GET[b"content"]
+    else:
+        output = request.body
+
+    output = zlib.compress(output, 9)
+
+    headers = [(b"Content-type", b"text/plain"),
+               (b"Content-Encoding", b"deflate"),
+               (b"X-Request-Method", request.method),
+               (b"X-Request-Query", request.url_parts.query if request.url_parts.query else b"NO"),
+               (b"X-Request-Content-Length", request.headers.get(b"Content-Length", b"NO")),
+               (b"X-Request-Content-Type", request.headers.get(b"Content-Type", b"NO")),
+               (b"Content-Length", len(output))]
+
+    return headers, output
diff --git a/test/wpt/tests/xhr/response-body-errors.any.js b/test/wpt/tests/xhr/response-body-errors.any.js
new file mode 100644
index 00000000000..4edfed00fdd
--- /dev/null
+++ b/test/wpt/tests/xhr/response-body-errors.any.js
@@ -0,0 +1,23 @@
+// This will transmit two chunks TEST_CHUNK and then garbage, which should result in an error.
+const url = "/fetch/api/resources/bad-chunk-encoding.py?ms=1&count=2";
+
+test(() => {
+  client = new XMLHttpRequest();
+  client.open("GET", url, false);
+  assert_throws_dom("NetworkError", () => client.send());
+}, "Synchronous XMLHttpRequest should throw on bad chunk");
+
+async_test(t => {
+  client = new XMLHttpRequest();
+  client.open("GET", url, true);
+  client.onreadystatechange = t.step_func(() => {
+    if (client.readyState === 3) {
+      assert_true(client.responseText.indexOf("TEST_CHUNK") !== -1);
+    }
+  });
+  client.onerror = t.step_func_done(() => {
+    assert_equals(client.responseText, "");
+  });
+  client.onload = t.unreached_func();
+  client.send();
+}, "Asynchronous XMLHttpRequest should clear response on bad chunk");
diff --git a/test/wpt/tests/xhr/response-data-arraybuffer.htm b/test/wpt/tests/xhr/response-data-arraybuffer.htm
new file mode 100644
index 00000000000..7eaf7198ae2
--- /dev/null
+++ b/test/wpt/tests/xhr/response-data-arraybuffer.htm
@@ -0,0 +1,54 @@
+<!DOCTYPE html>
+<html>
+<head>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-responsetype-attribute" data-tested-assertations="following::ol[1]/li[4]" />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-response-attribute" data-tested-assertations="following::a[contains(@href,'#arraybuffer-response-entity-body')]/.." />
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <title>XMLHttpRequest: The response attribute: ArrayBuffer data</title>
+</head>
+
+<body>
+    <div id="log"></div>
+
+    <script type="text/javascript">
+        var test = async_test();
+
+        test.step(function()
+        {
+            var xhr = new XMLHttpRequest();
+
+            xhr.onreadystatechange = function()
+            {
+                if (xhr.readyState == 4)
+                {
+                    test.step(function()
+                    {
+                        assert_equals(xhr.status, 200);
+
+                        var buf = xhr.response;
+                        assert_true(buf instanceof ArrayBuffer);
+
+                        var arr = new Uint8Array(buf);
+                        assert_equals(arr.length, 5);
+                        assert_equals(arr[0], 0x48, "Expect 'H'");
+                        assert_equals(arr[1], 0x65, "Expect 'e'");
+                        assert_equals(arr[2], 0x6c, "Expect 'l'");
+                        assert_equals(arr[3], 0x6c, "Expect 'l'");
+                        assert_equals(arr[4], 0x6f, "Expect 'o'");
+
+                        assert_equals(xhr.response, xhr.response,
+                                      "Response should be cached");
+
+                        test.done();
+                    });
+                }
+            };
+
+            xhr.open("GET", "./resources/content.py?content=Hello", true);
+            xhr.responseType = "arraybuffer";
+            xhr.send();
+        });
+    </script>
+</body>
+</html>
diff --git a/test/wpt/tests/xhr/response-data-blob.htm b/test/wpt/tests/xhr/response-data-blob.htm
new file mode 100644
index 00000000000..19731d3dc1e
--- /dev/null
+++ b/test/wpt/tests/xhr/response-data-blob.htm
@@ -0,0 +1,55 @@
+<!DOCTYPE html>
+<html>
+<head>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-send()-method" />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-responsetype-attribute"  data-tested-assertations="following::ol[1]/li[4]"/>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-response-attribute"  data-tested-assertations="following::a[contains(@href,'#blob-response-entity-body')]/.." />
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <title>XMLHttpRequest: The response attribute: Blob data</title>
+</head>
+
+<body>
+    <div id="log"></div>
+
+    <script type="text/javascript">
+        var test = async_test();
+
+        test.step(function()
+        {
+            var xhr = new XMLHttpRequest();
+            var content = "Hello";
+            var blob;
+
+            xhr.onreadystatechange = function()
+            {
+                if (xhr.readyState == 4)
+                {
+                    test.step(function()
+                    {
+                        blob = xhr.response;
+                        assert_equals(xhr.response, xhr.response,
+                                      "Response should be cached");
+                        assert_true(blob instanceof Blob, 'blob is a Blob');
+
+                        var reader = new FileReader();
+                        reader.onload = function()
+                        {
+                            test.step(function()
+                            {
+                                assert_equals(reader.result, content);
+                                test.done();
+                            });
+                        };
+                        reader.readAsText(blob);
+                    });
+                }
+            }
+
+            xhr.open("GET", "./resources/content.py?content=" + content, true);
+            xhr.responseType = "blob";
+            xhr.send();
+        });
+    </script>
+</body>
+</html>
diff --git a/test/wpt/tests/xhr/response-data-deflate.htm b/test/wpt/tests/xhr/response-data-deflate.htm
new file mode 100644
index 00000000000..bce2745f4f7
--- /dev/null
+++ b/test/wpt/tests/xhr/response-data-deflate.htm
@@ -0,0 +1,42 @@
+<!doctype html>
+<html>
+  <head>
+    <title>XMLHttpRequest: content-encoding:deflate response was correctly inflated</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <link rel="help" href="https://dvcs.w3.org/hg/xhr/raw-file/tip/Overview.html#the-send()-method" data-tested-assertations="following::p[contains(text(),'content-encodings')]" />
+  </head>
+  <body>
+    <div id="log"></div>
+    <script>
+      function request(input) {
+        var test = async_test();
+        test.step(function() {
+          var client = new XMLHttpRequest()
+
+          client.open("POST", "resources/zlib.py", false);
+
+          client.onreadystatechange = test.step_func(function () {
+              if (client.readyState === 4) {
+                  var len = parseInt(client.getResponseHeader('content-length'), 10);
+
+                  assert_equals(client.getResponseHeader('content-encoding'), 'deflate');
+                  assert_true(len < input.length);
+                  assert_equals(client.responseText, input);
+                  test.done();
+              }
+          });
+
+          client.send(input);
+        });
+      }
+
+      var wellCompressableData = '';
+      for (var i = 0; i < 500; i++) {
+          wellCompressableData += 'foofoofoofoofoofoofoo';
+      }
+
+      request(wellCompressableData);
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/response-data-gzip.htm b/test/wpt/tests/xhr/response-data-gzip.htm
new file mode 100644
index 00000000000..a3d2713d0f4
--- /dev/null
+++ b/test/wpt/tests/xhr/response-data-gzip.htm
@@ -0,0 +1,42 @@
+<!doctype html>
+<html>
+  <head>
+    <title>XMLHttpRequest: GZIP response was correctly inflated</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <link rel="help" href="https://dvcs.w3.org/hg/xhr/raw-file/tip/Overview.html#the-send()-method" data-tested-assertations="following::p[contains(text(),'content-encodings')]" />
+  </head>
+  <body>
+    <div id="log"></div>
+    <script>
+      function request(input) {
+        var test = async_test();
+        test.step(function() {
+          var client = new XMLHttpRequest()
+
+          client.open("POST", "resources/gzip.py", false);
+
+          client.onreadystatechange = test.step_func(function () {
+              if (client.readyState === 4) {
+                  var len = parseInt(client.getResponseHeader('content-length'), 10);
+
+                  assert_equals(client.getResponseHeader('content-encoding'), 'gzip');
+                  assert_true(len < input.length);
+                  assert_equals(client.responseText, input);
+                  test.done();
+              }
+          });
+
+          client.send(input);
+        }, document.title);
+      }
+
+      var wellCompressableData = '';
+      for (var i = 0; i < 500; i++) {
+          wellCompressableData += 'foofoofoofoofoofoofoo';
+      }
+
+      request(wellCompressableData);
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/response-data-progress.htm b/test/wpt/tests/xhr/response-data-progress.htm
new file mode 100644
index 00000000000..78e749429ff
--- /dev/null
+++ b/test/wpt/tests/xhr/response-data-progress.htm
@@ -0,0 +1,52 @@
+<!doctype html>
+<html lang="en">
+<head>
+    <meta charset="utf-8">
+    <title>XMLHttpRequest: progress events grow response body size</title>
+    <meta name="timeout" content="long">
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-send()-method" data-tested-assertations="following::a[contains(@href,'#make-progress-notifications')]/.. following::a[contains(@href,'#make-progress-notifications')]/../following:p[1]" />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#make-progress-notifications" data-tested-assertations=".." />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#handler-xhr-onprogress" data-tested-assertations="/../.." />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#event-xhr-progress" data-tested-assertations="/../.." />
+</head>
+
+<div id="log"></div>
+
+<script>
+
+function doTest(test, expectedLengthComputable, expectedTotal, url) {
+    var client = new XMLHttpRequest();
+    var lastSize = 0;
+
+    client.onprogress = test.step_func(function(e) {
+        assert_equals(e.total, expectedTotal);
+        assert_equals(e.lengthComputable, expectedLengthComputable);
+
+        var currentSize = client.responseText.length;
+
+        if (lastSize > 0 && currentSize > lastSize) {
+            // growth from a positive size to bigger!
+            test.done();
+        }
+
+        lastSize = currentSize;
+    });
+
+    client.onreadystatechange = test.step_func(function() {
+        if (client.readyState === 4) {
+            assert_unreached("onprogress not called multiple times, or response body did not grow.");
+        }
+    });
+
+    client.open("GET", url);
+    client.send(null);
+    return client;
+}
+
+async_test(function () { doTest(this, false, 0, "resources/trickle.py?count=6&delay=150"); },
+           document.title + ', unknown content-length');
+async_test(function () { doTest(this, true, 78, "resources/trickle.py?count=6&delay=150&specifylength=1"); },
+           document.title + ', known content-length');
+</script>
diff --git a/test/wpt/tests/xhr/response-invalid-responsetype.htm b/test/wpt/tests/xhr/response-invalid-responsetype.htm
new file mode 100644
index 00000000000..603c4cd0ed7
--- /dev/null
+++ b/test/wpt/tests/xhr/response-invalid-responsetype.htm
@@ -0,0 +1,38 @@
+<!doctype html>
+<html>
+  <head>
+    <title>XMLHttpRequest: response is plain text if responseType is set to an invalid string</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-response-attribute" data-tested-assertations="following::dd[2]/ol[1]/li[2]" />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-responsetype-attribute" data-tested-assertations="following::ol[1]/li[4]" /><!-- Not quite - but this is handled in WebIDL, not the XHR spec -->
+  </head>
+  <body>
+    <div id="log"></div>
+    <script>
+      function request(type) {
+        var test = async_test(document.title+' ('+type+')')
+        test.step(function() {
+          var client = new XMLHttpRequest()
+          client.responseType = type
+          assert_equals(client.responseType, '')
+          client.open("GET", "resources/folder.txt", true)
+          client.onload = function(){
+            test.step(function(){
+                assert_equals(client.responseType, '')
+                assert_equals(client.response, 'bottom\n')
+                assert_equals(typeof client.response, 'string')
+                test.done()
+            })
+          }
+          client.send(null)
+        })
+      }
+      request("arrayBuffer") // case sensitive
+      request("JSON") // case sensitive
+      request("glob")
+      request("txt")
+      request("text/html")
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/response-json.htm b/test/wpt/tests/xhr/response-json.htm
new file mode 100644
index 00000000000..a694d7fc615
--- /dev/null
+++ b/test/wpt/tests/xhr/response-json.htm
@@ -0,0 +1,61 @@
+<!doctype html>
+<html>
+  <head>
+    <title>XMLHttpRequest: responseType json</title>
+    <meta charset="utf-8">
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+        <link rel="help" href="https://xhr.spec.whatwg.org/#the-responsetype-attribute" data-tested-assertations="following::OL[1]/LI[4]" />
+        <link rel="help" href="https://xhr.spec.whatwg.org/#the-response-attribute" data-tested-assertations="following::dt[2]/dt[4] following::dt[2]/dt[4]/following::dd[1]" />
+        <link rel="help" href="https://xhr.spec.whatwg.org/#json-response-entity-body" data-tested-assertations="following::ol[1]/li[1] following::ol[1]/li[2] following::ol[1]/li[3]" />
+
+  </head>
+  <body>
+    <div id="log"></div>
+    <script>
+      function setupXHR () {
+        var client = new XMLHttpRequest()
+        client.open('POST', "resources/content.py", true)
+        client.responseType = 'json'
+        return client
+      }
+      function makeTest(data, expectedResponse, description){
+        var test = async_test(description)
+        var xhr = setupXHR()
+        assert_equals(xhr.responseType, 'json')
+        xhr.onreadystatechange = function(){
+            if(xhr.readyState === 4){
+                test.step(function(){
+                    assert_equals(xhr.status, 200)
+                    assert_equals(xhr.responseType, 'json')
+                    assert_equals(typeof xhr.response, 'object')
+                    if(expectedResponse){ // if the expectedResponse is not null, we iterate over properties to do a deeper comparison..
+                        for(var prop in expectedResponse){
+                          if (expectedResponse[prop] instanceof Array) {
+                            assert_array_equals(expectedResponse[prop], xhr.response[prop])
+                          }else{
+                            assert_equals(expectedResponse[prop], xhr.response[prop])
+                          }
+                        }
+                    }else{
+                        assert_equals(xhr.response, expectedResponse) // null comparison, basically
+                    }
+                    assert_equals(xhr.response, xhr.response,
+                                  "Response should be cached")
+                    test.done()
+                })
+            }
+        }
+        xhr.send(data)
+      }
+      // no data
+      makeTest("", null, 'json response with no data: response property is null')
+      // malformed
+      makeTest('{"test":"foo"', null, 'json response with malformed data: response property is null')
+      // real object
+      var obj = {alpha:'a-z', integer:15003, negated:-20, b1:true, b2:false, myAr:['a', 'b', 'c', 1, 2, 3]}
+      makeTest(JSON.stringify(obj), obj,  'JSON object roundtrip')
+      makeTest('{"日本語":"にほんご"}', {"日本語":"にほんご"}, 'JSON roundtrip with Japanese text')
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/response-method.htm b/test/wpt/tests/xhr/response-method.htm
new file mode 100644
index 00000000000..1bf26bac79c
--- /dev/null
+++ b/test/wpt/tests/xhr/response-method.htm
@@ -0,0 +1,21 @@
+<!doctype html>
+<html>
+  <head>
+    <title>XMLHttpRequest: influence of HTTP method on response</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+  </head>
+  <body>
+    <div id="log"></div>
+    <script>
+      ["GET", "HEAD", "POST"].forEach(function(method) {
+        test(function() {
+          var client = new XMLHttpRequest()
+          client.open(method, "resources/echo-method.py", false)
+          client.send()
+          assert_equals(client.responseText, (method === "HEAD" ? "" : method))
+        }, method)
+      })
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/responseText-status.html b/test/wpt/tests/xhr/responseText-status.html
new file mode 100644
index 00000000000..7d575902ddc
--- /dev/null
+++ b/test/wpt/tests/xhr/responseText-status.html
@@ -0,0 +1,33 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>XMLHttpRequest Test: responseText - status</title>
+<link rel="author" title="Intel" href="http://www.intel.com">
+<meta name="assert" content="Check if XMLHttpRequest.responseText return empty string if state is not LOADING or DONE">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+
+<div id="log"></div>
+
+<script>
+
+async_test(function (t) {
+  var client = new XMLHttpRequest();
+  t.step(function () {
+    assert_equals(client.responseText, "");
+  });
+
+  client.onreadystatechange = t.step_func(function () {
+    if (client.readyState == 1 || client.readyState == 2) {
+      assert_equals(client.responseText, "");
+    }
+
+    if (client.readyState == 3) {
+      t.done();
+    }
+  });
+
+  client.open("GET", "resources/headers.py")
+  client.send(null)
+}, document.title);
+
+</script>
diff --git a/test/wpt/tests/xhr/responseType-document-in-worker.html b/test/wpt/tests/xhr/responseType-document-in-worker.html
new file mode 100644
index 00000000000..9a04320df92
--- /dev/null
+++ b/test/wpt/tests/xhr/responseType-document-in-worker.html
@@ -0,0 +1,13 @@
+<!doctype html>
+<html>
+<head>
+    <meta charset="utf-8">
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+</head>
+<body>
+<script>
+    fetch_tests_from_worker(new Worker("resources/responseType-document-in-worker.js"));
+</script>
+</body>
+</html>
diff --git a/test/wpt/tests/xhr/responseXML-unavailable-in-worker.html b/test/wpt/tests/xhr/responseXML-unavailable-in-worker.html
new file mode 100644
index 00000000000..dcb4cb04973
--- /dev/null
+++ b/test/wpt/tests/xhr/responseXML-unavailable-in-worker.html
@@ -0,0 +1,13 @@
+<!doctype html>
+<html>
+<head>
+    <meta charset="utf-8">
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+</head>
+<body>
+<script>
+    fetch_tests_from_worker(new Worker("resources/responseXML-unavailable-in-worker.js"));
+</script>
+</body>
+</html>
diff --git a/test/wpt/tests/xhr/responsedocument-decoding.htm b/test/wpt/tests/xhr/responsedocument-decoding.htm
new file mode 100644
index 00000000000..7fb4b2d1fd8
--- /dev/null
+++ b/test/wpt/tests/xhr/responsedocument-decoding.htm
@@ -0,0 +1,39 @@
+<!doctype html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>XMLHttpRequest: response document decoding</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+  </head>
+  <body>
+    <script>
+      function request(type, input, expected) {
+        async_test((test) => {
+          const client = new XMLHttpRequest();
+          client.responseType = 'document';
+          client.open("GET", "resources/status.py?content=" + input + "&type=" + encodeURIComponent(type), true);
+          client.onload = test.step_func_done(() => {
+            assert_equals(client.responseXML.querySelector("x").textContent, expected);
+          })
+          client.send(null);
+        }, document.title + " (" + type + " " + input + ")");
+      }
+
+      const encoded_content = "%e6%a9%9f";
+      const encoded_xml =
+        encodeURIComponent("<?xml version='1.0' encoding='windows-1252'?><x>") + encoded_content + encodeURIComponent("<\/x>");
+      const encoded_html =
+        encodeURIComponent("<!doctype html><meta charset=windows-1252><x>") + encoded_content + encodeURIComponent("<\/x>");
+      const decoded_as_windows_1252 = "\u00e6\u00a9\u0178";
+      const decoded_as_utf_8 = "\u6a5f";
+
+      request("application/xml", encoded_xml, decoded_as_windows_1252);
+      request("application/xml;charset=utf-8", encoded_xml, decoded_as_utf_8);
+      request("application/xml;charset=windows-1252", encoded_xml, decoded_as_windows_1252);
+      request("text/html", encoded_html, decoded_as_windows_1252);
+      request("text/html;charset=utf-8", encoded_html, decoded_as_utf_8);
+      request("text/html;charset=windows-1252", encoded_html, decoded_as_windows_1252);
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/responsetext-decoding.htm b/test/wpt/tests/xhr/responsetext-decoding.htm
new file mode 100644
index 00000000000..fae01048ba3
--- /dev/null
+++ b/test/wpt/tests/xhr/responsetext-decoding.htm
@@ -0,0 +1,93 @@
+<!doctype html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>XMLHttpRequest: responseText decoding</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+  </head>
+  <body>
+    <script>
+      function create_html(content) {
+        return "<!doctype html><meta charset=windows-1252><x>" + content + "</x>";
+      }
+      function create_encoded_html(encoded_content) {
+        return encodeURIComponent("<!doctype html><meta charset=windows-1252><x>") + encoded_content + encodeURIComponent("<\/x>");
+      }
+      function create_xml(content) {
+        return "<?xml version='1.0' encoding='windows-1252'?><x>" + content + "</x>";
+      }
+      function create_encoded_xml(encoded_content) {
+        return encodeURIComponent("<?xml version='1.0' encoding='windows-1252'?><x>") + encoded_content + encodeURIComponent("<\/x>");
+      }
+      function request(type, input, output, responseType) {
+        async_test((test) => {
+          const client = new XMLHttpRequest();
+          if (responseType !== undefined) {
+            client.responseType = responseType;
+          }
+          client.open("GET", "resources/status.py?content=" + input + "&type=" + encodeURIComponent(type), true);
+          client.onload = test.step_func_done(() => {
+            assert_equals(client.responseText, output);
+          })
+          client.send(null);
+        }, document.title + " (" + type + " " + input + " " + (responseType ? " " + responseType : "empty") + ")");
+      }
+
+      const encoded_content = "%e6%a9%9f";
+      const decoded_as_windows_1252 = "\u00e6\u00a9\u0178";
+      const decoded_as_utf_8 = "\u6a5f";
+      const encoded_xml = create_encoded_xml(encoded_content);
+      const encoded_html = create_encoded_html(encoded_content);
+      const xml_decoded_as_windows_1252 = create_xml(decoded_as_windows_1252);
+      const xml_decoded_as_utf_8 = create_xml(decoded_as_utf_8);
+      const html_decoded_as_windows_1252 = create_html(decoded_as_windows_1252);
+      const html_decoded_as_utf_8 = create_html(decoded_as_utf_8);
+
+      // "default" response type
+      // An XML-ish response is sniffed.
+      request("application/xml", encoded_xml, xml_decoded_as_windows_1252);
+      // An HTML-ish response isn't sniffed.
+      request("text/html", encoded_html, html_decoded_as_utf_8);
+      request("application/xml;charset=utf-8", encoded_xml, xml_decoded_as_utf_8);
+      request("application/xml;charset=windows-1252", encoded_xml, xml_decoded_as_windows_1252);
+      request("text/html;charset=utf-8", encoded_html, html_decoded_as_utf_8);
+      request("text/html;charset=windows-1252", encoded_html, html_decoded_as_windows_1252);
+      request("text/plain;charset=windows-1252", "%FF", "\u00FF");
+      request("text/plain", "%FF", "\uFFFD");
+      request("text/plain", "%FE%FF", "");
+      request("text/plain", "%FE%FF%FE%FF", "\uFEFF");
+      request("text/plain", "%EF%BB%BF", "");
+      request("text/plain", "%EF%BB%BF%EF%BB%BF", "\uFEFF");
+      request("text/plain", "%C2", "\uFFFD");
+      request("text/xml", "%FE%FF", "");
+      request("text/xml", "%FE%FF%FE%FF", "\uFEFF");
+      request("text/xml", "%EF%BB%BF", "");
+      request("text/xml", "%EF%BB%BF%EF%BB%BF", "\uFEFF");
+      request("text/plain", "%E3%81%B2", "\u3072");
+
+      // "text" response type
+      // An XML-ish response isn't sniffed.
+      request("application/xml", encoded_xml, xml_decoded_as_utf_8, "text");
+      // An HTML-ish response isn't sniffed.
+      request("text/html", encoded_html, html_decoded_as_utf_8, "text");
+      request("application/xml;charset=utf-8", encoded_xml, xml_decoded_as_utf_8, "text");
+      request("application/xml;charset=windows-1252", encoded_xml, xml_decoded_as_windows_1252, "text");
+      request("text/html;charset=utf-8", encoded_html, html_decoded_as_utf_8, "text");
+      request("text/html;charset=windows-1252", encoded_html, html_decoded_as_windows_1252, "text");
+      request("text/plain;charset=windows-1252", "%FF", "\u00FF", "text");
+      request("text/plain", "%FF", "\uFFFD", "text");
+      request("text/plain", "%FE%FF", "", "text");
+      request("text/plain", "%FE%FF%FE%FF", "\uFEFF", "text");
+      request("text/plain", "%EF%BB%BF", "", "text");
+      request("text/plain", "%EF%BB%BF%EF%BB%BF", "\uFEFF", "text");
+      request("text/plain", "%C2", "\uFFFD", "text");
+      request("text/plain;charset=bogus", "%C2", "\uFFFD", "text");
+      request("text/xml", "%FE%FF", "", "text");
+      request("text/xml", "%FE%FF%FE%FF", "\uFEFF", "text");
+      request("text/xml", "%EF%BB%BF", "", "text");
+      request("text/xml", "%EF%BB%BF%EF%BB%BF", "\uFEFF", "text");
+      request("text/plain", "%E3%81%B2", "\u3072", "text");
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/responsetype.any.js b/test/wpt/tests/xhr/responsetype.any.js
new file mode 100644
index 00000000000..444c3e3d169
--- /dev/null
+++ b/test/wpt/tests/xhr/responsetype.any.js
@@ -0,0 +1,135 @@
+// META: title=XMLHttpRequest.responseType
+
+/**
+ * Author: Mathias Bynens <http://mathiasbynens.be/>
+ * Author: Ms2ger <mailto:Ms2ger@gmail.com>
+ *
+ * Spec: <https://xhr.spec.whatwg.org/#the-responsetype-attribute>
+ */
+test(function() {
+  var xhr = new XMLHttpRequest();
+  assert_equals(xhr.responseType, '');
+}, 'Initial value of responseType');
+
+var types = ['', 'json', 'document', 'arraybuffer', 'blob', 'text', "nosuchtype"];
+
+function isIgnoredType(type) {
+  if (type == "nosuchtype") {
+    return true;
+  }
+
+  if (type != "document") {
+    return false;
+  }
+
+  // "document" is ignored only on workers.
+  return GLOBAL.isWorker();
+}
+
+function expectedType(type) {
+  if (!isIgnoredType(type)) {
+    return type;
+  }
+
+  return "";
+}
+
+types.forEach(function(type) {
+  test(function() {
+    var xhr = new XMLHttpRequest();
+    xhr.responseType = type;
+    assert_equals(xhr.responseType, expectedType(type));
+  }, 'Set responseType to ' + format_value(type) + ' when readyState is UNSENT.');
+
+  test(function() {
+    var xhr = new XMLHttpRequest();
+    xhr.open('get', '/');
+    xhr.responseType = type;
+    assert_equals(xhr.responseType, expectedType(type));
+  }, 'Set responseType to ' + format_value(type) + ' when readyState is OPENED.');
+
+  async_test(function() {
+    var xhr = new XMLHttpRequest();
+    xhr.open('get', '/');
+    xhr.onreadystatechange = this.step_func(function() {
+      if (xhr.readyState === XMLHttpRequest.HEADERS_RECEIVED) {
+        xhr.responseType = type;
+        assert_equals(xhr.responseType, expectedType(type));
+        this.done();
+      }
+    });
+    xhr.send();
+  }, 'Set responseType to ' + format_value(type) + ' when readyState is HEADERS_RECEIVED.');
+
+  async_test(function() {
+    var xhr = new XMLHttpRequest();
+    xhr.open('get', '/');
+    xhr.onreadystatechange = this.step_func(function() {
+      if (xhr.readyState === XMLHttpRequest.LOADING) {
+        if (isIgnoredType(type)) {
+          xhr.responseType = type;
+        } else {
+          assert_throws_dom("InvalidStateError", function() {
+            xhr.responseType = type;
+          });
+        }
+        assert_equals(xhr.responseType, "");
+        this.done();
+      }
+    });
+    xhr.send();
+  }, 'Set responseType to ' + format_value(type) + ' when readyState is LOADING.');
+
+  async_test(function() {
+    var xhr = new XMLHttpRequest();
+    xhr.open('get', '/');
+    xhr.onreadystatechange = this.step_func(function() {
+      if (xhr.readyState === XMLHttpRequest.DONE) {
+        var text = xhr.responseText;
+        assert_not_equals(text, "");
+        if (isIgnoredType(type)) {
+          xhr.responseType = type;
+        } else {
+          assert_throws_dom("InvalidStateError", function() {
+            xhr.responseType = type;
+          });
+        }
+        assert_equals(xhr.responseType, "");
+        assert_equals(xhr.responseText, text);
+        this.done();
+      }
+    });
+    xhr.send();
+  }, 'Set responseType to ' + format_value(type) + ' when readyState is DONE.');
+
+  // Note: the case of setting responseType first, and then calling synchronous
+  // open(), is tested in open-method-responsetype-set-sync.htm.
+  test(function() {
+    var xhr = new XMLHttpRequest();
+    xhr.open('get', '/', false);
+    if (GLOBAL.isWorker() || isIgnoredType(type)) {
+      // Setting responseType on workers is valid even for a sync XHR.
+      xhr.responseType = type;
+      assert_equals(xhr.responseType, expectedType(type));
+    } else {
+      assert_throws_dom("InvalidAccessError", function() {
+        xhr.responseType = type;
+      });
+    }
+  }, 'Set responseType to ' + format_value(type) + ' when readyState is OPENED and the sync flag is set.');
+
+  test(function() {
+    var xhr = new XMLHttpRequest();
+    xhr.open('get', '/', false);
+    xhr.send();
+    assert_equals(xhr.readyState, XMLHttpRequest.DONE);
+    if (isIgnoredType(type)) {
+      xhr.responseType = type;
+    } else {
+      assert_throws_dom("InvalidStateError", function() {
+        xhr.responseType = type;
+      });
+    }
+    assert_equals(xhr.responseType, "");
+  }, 'Set responseType to ' + format_value(type) + ' when readyState is DONE and the sync flag is set.');
+});
diff --git a/test/wpt/tests/xhr/responseurl.html b/test/wpt/tests/xhr/responseurl.html
new file mode 100644
index 00000000000..b730e045d8d
--- /dev/null
+++ b/test/wpt/tests/xhr/responseurl.html
@@ -0,0 +1,37 @@
+<!doctype html>
+<html>
+  <head>
+    <title>XMLHttpRequest: responseURL test</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-responseurl-attribute"/>
+  </head>
+  <body>
+    <div id="log"></div>
+    <script>
+      test(function() {
+        var client = new XMLHttpRequest()
+        assert_equals(client.responseURL, "")
+
+        client.open("GET", "foo.html", false)
+        client.send()
+
+        expected = location.href.replace(/[^/]*$/, 'foo.html')
+        assert_equals(client.status, 404)
+        assert_equals(client.responseURL, expected)
+      }, "404 response has proper responseURL")
+      test(function() {
+        var client = new XMLHttpRequest()
+        assert_equals(client.responseURL, "")
+
+        target = "image.gif"
+        client.open("GET", "resources/redirect.py?location=" + target, false)
+        client.send()
+
+        expected = location.href.replace(/[^/]*$/, "resources/" + target)
+        assert_equals(client.status, 200)
+        assert_equals(client.responseURL, expected)
+      }, "Redirected response has proper responseURL")
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/responsexml-basic.htm b/test/wpt/tests/xhr/responsexml-basic.htm
new file mode 100644
index 00000000000..a3ce7b5b544
--- /dev/null
+++ b/test/wpt/tests/xhr/responsexml-basic.htm
@@ -0,0 +1,33 @@
+<!doctype html>
+<html>
+  <head>
+    <title>XMLHttpRequest: responseXML basic test</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-responsexml-attribute" data-tested-assertations="following::ol[1]/li[2] following::ol[1]/li[4]" />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#document-response-entity-body" data-tested-assertations="following::ol[1]/li[1] following::ol[1]/li[6] following::ol[1]/li[10]" />
+  </head>
+  <body>
+    <div id="log"></div>
+    <script>
+      test(function() {
+        var client = new XMLHttpRequest()
+        assert_equals(client.responseXML, null)
+        client.open("GET", "resources/well-formed.xml", false)
+        assert_equals(client.responseXML, null)
+        client.send(null)
+        assert_equals(client.responseXML.documentElement.localName, "html", 'localName is html')
+        assert_equals(client.responseXML.documentElement.childNodes.length, 5, 'childNodes is 5')
+        assert_equals(client.responseXML.getElementById("n1").localName, client.responseXML.documentElement.childNodes[1].localName)
+        assert_equals(client.responseXML.getElementById("n2"), client.responseXML.documentElement.childNodes[3], 'getElementById("n2")')
+        assert_equals(client.responseXML.getElementsByTagName("p")[1].namespaceURI, "namespacesarejuststrings", 'namespaceURI')
+      })
+      test(function() {
+        var client = new XMLHttpRequest()
+        client.open("GET", "resources/status.py?type=application/xml", false)
+        client.send(null)
+        assert_equals(client.responseXML, null)
+      }, 'responseXML on empty response documents')
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/responsexml-document-properties.htm b/test/wpt/tests/xhr/responsexml-document-properties.htm
new file mode 100644
index 00000000000..a9f14f8212a
--- /dev/null
+++ b/test/wpt/tests/xhr/responsexml-document-properties.htm
@@ -0,0 +1,123 @@
+<!doctype html>
+<html>
+  <head>
+    <title>XMLHttpRequest: responseXML document properties</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+  </head>
+  <body>
+    <div id="log"></div>
+    <script>
+      var timePreXHR = Math.floor(new Date().getTime(new Date().getTime() - 3000) / 1000); // three seconds ago, in case there's clock drift
+      var client = new XMLHttpRequest()
+      client.open("GET", "resources/well-formed.xml", false)
+      client.send(null)
+      var responseURLObject = new URL('resources/well-formed.xml', location.href);
+      var responseURL = responseURLObject.href
+      var responseDomain = responseURLObject.hostname
+      var expected = {
+        domain:responseDomain,
+        URL:responseURL,
+        documentURI:responseURL,
+        baseURI:responseURL,
+        referrer:'',
+        title:'',
+        contentType:'application/xml',
+        readyState:'complete',
+        location:null,
+        defaultView:null,
+        body:null,
+        doctype:null,
+        all:HTMLAllCollection,
+        cookie:''
+      }
+
+      for (var name in expected) {
+        runTest(name, expected[name])
+      }
+
+      function runTest(name, value){
+        test(function(){
+          if (name == "all") {
+            assert_equals(Object.getPrototypeOf(client.responseXML[name]), value.prototype)
+          } else {
+            assert_equals(client.responseXML[name], value)
+          }
+        }, name)
+      }
+
+      // Parse a "lastModified" value and convert it to a Date.
+      // See https://html.spec.whatwg.org/multipage/dom.html#dom-document-lastmodified
+      function parseLastModified(value) {
+        const [undefined, month, day, year, hours, minutes, seconds] =
+          /^(\d\d)\/(\d\d)\/(\d+) (\d\d):(\d\d):(\d\d)$/.exec(value);
+        return new Date(year, month - 1, day, hours, minutes, seconds);
+      }
+
+      async_test(t => {
+        const client = new XMLHttpRequest();
+        client.open("GET", "resources/redirect.py?location=well-formed.xml");
+        client.send();
+        client.onload = t.step_func_done(() => {
+          assert_equals(client.responseXML.URL, responseURL);
+          assert_equals(client.responseXML.baseURI, responseURL);
+        });
+      }, "Test document URL properties after redirect");
+
+      async_test(t => {
+        const client = new XMLHttpRequest();
+        client.open("GET", "resources/redirect.py?location=base.xml");
+        client.send();
+        client.onload = t.step_func_done(() => {
+          const localResponseURL = new URL('resources/base.xml', location.href).href;
+          assert_equals(client.responseXML.URL, localResponseURL);
+          assert_equals(client.responseXML.baseURI, 'https://example.com/');
+          client.responseXML.documentElement.remove();
+          assert_equals(client.responseXML.baseURI, localResponseURL);
+          const newBase = document.createElement("base"),
+                newBaseURL = "https://elsewhere.example/";
+          newBase.href = "https://elsewhere.example/";
+          client.responseXML.appendChild(newBase);
+          assert_equals(client.responseXML.baseURI, newBaseURL);
+          newBase.remove();
+          document.head.appendChild(newBase);
+          assert_equals(client.responseXML.baseURI, localResponseURL);
+          newBase.remove();
+        });
+      }, "Test document URL properties of document with <base> after redirect");
+
+      test(function() {
+        var lastModified = Math.floor(parseLastModified(client.responseXML.lastModified).getTime() / 1000);
+        var now = Math.floor(new Date().getTime(new Date().getTime() + 3000) / 1000); // three seconds from now, in case there's clock drift
+        assert_greater_than_equal(lastModified, timePreXHR);
+        assert_less_than_equal(lastModified, now);
+      }, 'lastModified set to time of response if no HTTP header provided')
+
+      test(function() {
+        var client2 = new XMLHttpRequest()
+        client2.open("GET", "resources/last-modified.py", false)
+        client2.send(null)
+        assert_equals((new Date(client2.getResponseHeader('Last-Modified'))).getTime(), (parseLastModified(client2.responseXML.lastModified)).getTime())
+      }, 'lastModified set to related HTTP header if provided')
+
+      test(function() {
+        client.responseXML.cookie = "thisshouldbeignored"
+        assert_equals(client.responseXML.cookie, "")
+      }, 'cookie (after setting it)')
+
+      var objectProps = [
+        "styleSheets",
+        "implementation",
+        "images",
+        "forms",
+        "links",
+      ];
+
+      for (let prop of objectProps) {
+        test(function() {
+          assert_equals(typeof(client.responseXML[prop]), "object")
+        }, prop + " should be an object")
+      }
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/responsexml-get-twice.htm b/test/wpt/tests/xhr/responsexml-get-twice.htm
new file mode 100644
index 00000000000..e86a6d59e51
--- /dev/null
+++ b/test/wpt/tests/xhr/responsexml-get-twice.htm
@@ -0,0 +1,66 @@
+<!doctype html>
+<meta charset="utf-8">
+<title></title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script>
+      async_test(function() {
+        var client = new XMLHttpRequest()
+        client.open("GET", "resources/well-formed.xml")
+        client.responseType = "document"
+        assert_equals(client.responseType, "document")
+        client.send()
+        client.onload = this.step_func_done(function() {
+          var first = client.response
+          var second = client.response
+          assert_not_equals(first, null)
+          assert_not_equals(second, null)
+          assert_equals(first, second)
+        })
+      }, "Getting response, then response")
+
+      async_test(function() {
+        var client = new XMLHttpRequest()
+        client.open("GET", "resources/well-formed.xml")
+        client.responseType = "document"
+        assert_equals(client.responseType, "document")
+        client.send()
+        client.onload = this.step_func_done(function() {
+          var first = client.responseXML
+          var second = client.responseXML
+          assert_not_equals(first, null)
+          assert_not_equals(second, null)
+          assert_equals(first, second)
+        })
+      }, "Getting responseXML, then responseXML")
+
+      async_test(function() {
+        var client = new XMLHttpRequest()
+        client.open("GET", "resources/well-formed.xml")
+        client.responseType = "document"
+        assert_equals(client.responseType, "document")
+        client.send()
+        client.onload = this.step_func_done(function() {
+          var first = client.responseXML
+          var second = client.response
+          assert_not_equals(first, null)
+          assert_not_equals(second, null)
+          assert_equals(first, second)
+        })
+      }, "Getting responseXML, then response")
+
+      async_test(function() {
+        var client = new XMLHttpRequest()
+        client.open("GET", "resources/well-formed.xml")
+        client.responseType = "document"
+        assert_equals(client.responseType, "document")
+        client.send()
+        client.onload = this.step_func_done(function() {
+          var first = client.response
+          var second = client.responseXML
+          assert_not_equals(first, null)
+          assert_not_equals(second, null)
+          assert_equals(first, second)
+        })
+      }, "Getting response, then responseXML")
+</script>
diff --git a/test/wpt/tests/xhr/responsexml-media-type.htm b/test/wpt/tests/xhr/responsexml-media-type.htm
new file mode 100644
index 00000000000..ece413d51b8
--- /dev/null
+++ b/test/wpt/tests/xhr/responsexml-media-type.htm
@@ -0,0 +1,41 @@
+<!doctype html>
+<html>
+  <head>
+    <title>XMLHttpRequest: responseXML MIME type tests</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-responsexml-attribute" data-tested-assertations="following::ol[1]/li[4]" />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#document-response-entity-body" data-tested-assertations="following::ol[1]/li[3] following::ol[1]/li[4] following::ol[1]/li[6] following::ol[1]/li[10]" />
+  </head>
+  <body>
+    <div id="log"></div>
+    <script>
+      function request(type, succeed) {
+        test(function() {
+          var client = new XMLHttpRequest()
+          client.open("GET", "resources/status.py?content=<x><\/x>&type=" + encodeURIComponent(type), false)
+          client.send(null)
+          if(!succeed)
+            assert_equals(client.responseXML, null)
+          else
+            assert_equals(client.responseXML.documentElement.localName, "x")
+        }, document.title + " ('" + type + "', should "+(succeed?'':'not')+" parse)")
+      }
+      request("", true)
+      request("text/html", false)
+      request("bogus", true)
+      request("bogus+xml", true)
+      request("text/plain;+xml", false)
+      request("text/plainxml", false)
+      request("video/x-awesome+xml", true)
+      request("video/x-awesome", false)
+      request("text/xml", true)
+      request("application", true)
+      request("text/xsl", false)
+      request("text/plain", false)
+      request("application/rdf", false)
+      request("application/xhtml+xml", true)
+      request("image/svg+xml", true)
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/responsexml-non-document-types.htm b/test/wpt/tests/xhr/responsexml-non-document-types.htm
new file mode 100644
index 00000000000..6d7feea7530
--- /dev/null
+++ b/test/wpt/tests/xhr/responsexml-non-document-types.htm
@@ -0,0 +1,45 @@
+<!doctype html>
+<html>
+  <head>
+    <title>XMLHttpRequest: responseXML/responseText on other responseType</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-responsexml-attribute" data-tested-assertations="following::ol[1]/li[1]" />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-responsetext-attribute" data-tested-assertations="following::ol[1]/li[1]" />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-responsetype-attribute" data-tested-assertations="following::ol[1]/li[4]" />
+  </head>
+  <body>
+    <div id="log"></div>
+    <script>
+      function request(type) {
+        var test = async_test(document.title+' ('+type+')')
+        test.step(function() {
+          var client = new XMLHttpRequest()
+          client.responseType = type
+          client.open("GET", "resources/well-formed.xml", true)
+          client.onload = function(){
+            test.step(function(){
+                if(type !== 'document'){
+                  assert_throws_dom("InvalidStateError", function() {
+                    var x = client.responseXML;
+                  }, 'responseXML throw for '+type)
+                }
+                if(type !== 'text'){
+                  assert_throws_dom("InvalidStateError", function() {
+                    var x = client.responseText;
+                  }, 'responseText throws for '+type)
+                }
+                test.done()
+            })
+          }
+          client.send(null)
+        })
+      }
+      request("arraybuffer")
+      request("blob")
+      request("json")
+      request("text")
+      request("document")
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/responsexml-non-well-formed.htm b/test/wpt/tests/xhr/responsexml-non-well-formed.htm
new file mode 100644
index 00000000000..216da81706d
--- /dev/null
+++ b/test/wpt/tests/xhr/responsexml-non-well-formed.htm
@@ -0,0 +1,30 @@
+<!doctype html>
+<html>
+  <head>
+    <title>XMLHttpRequest: responseXML non well-formed tests</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-responsexml-attribute" data-tested-assertations="following::ol[1]/li[4]" />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#document-response-entity-body" data-tested-assertations="following::ol[1]/li[6] following::ol[1]/li[10]" />
+  </head>
+  <body>
+    <div id="log"></div>
+    <script>
+      function request(content) {
+        test(function() {
+          var client = new XMLHttpRequest()
+          client.open("GET", "resources/status.py?type=text/xml&content=" + encodeURIComponent(content), false)
+          client.send(null)
+          assert_equals(client.responseXML, null)
+        })
+      }
+      request("<x")
+      request("<x></x")
+      request("<x>&amp</x>")
+      request("<x><y></x></y>") // misnested tags
+      request("<x></x><y></y>") // two root elements is not allowed
+      request("<x> <![CDATA[ foobar ]></x>") // CDATA should end with ]]>
+      request("<x> <!CDATA[ foobar ]]></x>") // CDATA should start with <![
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/security-consideration.sub.html b/test/wpt/tests/xhr/security-consideration.sub.html
new file mode 100644
index 00000000000..a364e2cb8da
--- /dev/null
+++ b/test/wpt/tests/xhr/security-consideration.sub.html
@@ -0,0 +1,36 @@
+<!doctype html>
+<html>
+  <head>
+    <title>ProgressEvent: security consideration</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#security-considerations" data-tested-assertations="/following-sibling::p" />
+    <link rel="help" href="https://fetch.spec.whatwg.org/#http-fetch" data-tested-assertations="/following-sibling::ol[1]/li[3]/ol[1]/li[6]" />
+  </head>
+  <body>
+    <div id="log"></div>
+    <script>
+      async_test(function() {
+        var xhr = new XMLHttpRequest();
+
+        xhr.onprogress = this.unreached_func("MUST NOT dispatch progress event.");
+        xhr.onload = this.unreached_func("MUST NOT dispatch load event.");
+        xhr.onerror = this.step_func(function(pe) {
+          assert_equals(pe.type, "error");
+          assert_equals(pe.loaded, 0, "loaded is zero.");
+          assert_false(pe.lengthComputable, "lengthComputable is false.");
+          assert_equals(pe.total, 0, "total is zero.");
+        });
+        xhr.onloadend = this.step_func(function(pe) {
+          assert_equals(pe.type, "loadend");
+          assert_equals(pe.loaded, 0, "loaded is zero.");
+          assert_false(pe.lengthComputable, "lengthComputable is false.");
+          assert_equals(pe.total, 0, "total is zero.");
+          this.done();
+        });
+        xhr.open("GET", "http://{{host}}:{{ports[http][1]}}/xhr/resources/img.jpg", true);
+        xhr.send(null);
+      })
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/send-accept-language.htm b/test/wpt/tests/xhr/send-accept-language.htm
new file mode 100644
index 00000000000..737b5c2a0ed
--- /dev/null
+++ b/test/wpt/tests/xhr/send-accept-language.htm
@@ -0,0 +1,27 @@
+<!doctype html>
+<html>
+  <head>
+    <title>XMLHttpRequest: send() - Accept-Language</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-send()-method">
+  </head>
+  <body>
+    <div id="log"></div>
+    <script>
+      test(function() {
+        var client = new XMLHttpRequest()
+        client.open('GET', 'resources/inspect-headers.py?filter_name=accept-language', false)
+        client.send(null)
+        assert_regexp_match(client.responseText, /Accept-Language:\s.+/)
+      }, 'Send "sensible" default value, whatever that means')
+      test(function() {
+        var client = new XMLHttpRequest()
+        client.open("GET", "resources/inspect-headers.py?filter_name=accept-language", false)
+        client.setRequestHeader("Accept-Language", "x-GameSpeak")
+        client.send(null)
+        assert_equals(client.responseText, "Accept-Language: x-GameSpeak\n")
+      })
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/send-accept.htm b/test/wpt/tests/xhr/send-accept.htm
new file mode 100644
index 00000000000..2731eb6be18
--- /dev/null
+++ b/test/wpt/tests/xhr/send-accept.htm
@@ -0,0 +1,24 @@
+<!doctype html>
+<html>
+  <head>
+    <title>XMLHttpRequest: send() - Accept</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-send()-method" data-tested-assertations="following::code[contains(text(),'*/*')]/.. following::code[contains(text(),'Accept')]/.. following::code[contains(text(),'Accept')]/../following::ul[1]/li[1]" />
+  </head>
+  <body>
+    <div id="log"></div>
+    <script>
+      test(function() {
+        var client = new XMLHttpRequest()
+        client.open("GET", "resources/accept.py", false)
+        client.send(null)
+        assert_equals(client.responseText, "*/*")
+        client.open("GET", "resources/accept.py", false)
+        client.setRequestHeader("Accept", "x-something/vague, text/html5")
+        client.send(null)
+        assert_equals(client.responseText, "x-something/vague, text/html5")
+      })
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/send-after-setting-document-domain.htm b/test/wpt/tests/xhr/send-after-setting-document-domain.htm
new file mode 100644
index 00000000000..49eeb955533
--- /dev/null
+++ b/test/wpt/tests/xhr/send-after-setting-document-domain.htm
@@ -0,0 +1,39 @@
+<!doctype html>
+<html>
+  <head>
+    <title>XMLHttpRequest: send() with document.domain set</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-open()-method" data-tested-assertations="following::ol[1]/li[2]/ol[1]/li[3]" />
+  </head>
+  <body>
+    <div id="log"></div>
+    <script>
+      var test_base_url = location.protocol+'//www2.'+location.host+"/xhr/resources/",
+          test_windows = [
+            window.open(test_base_url + "send-after-setting-document-domain-window-1.htm"),
+            window.open(test_base_url + "send-after-setting-document-domain-window-2.htm"),
+          ],
+          num_tests_left = test_windows.length;
+
+      async_test(function(wrapper_test) {
+        window.addEventListener("message", function(evt) {
+          // run a shadow test that just forwards the results
+          async_test(function(test) {
+            assert_true(evt.data.passed, evt.data.message);
+            test.done();
+          }, evt.data.name);
+
+          // after last result comes in, close all test
+          // windows and complete the wrapper test.
+          if (--num_tests_left == 0) {
+            for (var i=0; i<test_windows.length; ++i) {
+              test_windows[i].close();
+            }
+            wrapper_test.done();
+          }
+        }, false);
+      }, "All tests ran");
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/send-authentication-basic-cors-not-enabled.htm b/test/wpt/tests/xhr/send-authentication-basic-cors-not-enabled.htm
new file mode 100644
index 00000000000..2e7cbaf0340
--- /dev/null
+++ b/test/wpt/tests/xhr/send-authentication-basic-cors-not-enabled.htm
@@ -0,0 +1,28 @@
+<!doctype html>
+<html>
+  <head>
+    <title>XMLHttpRequest: send() - "Basic" authenticated CORS requests with user name and password passed to open() (asserts failure)</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <script src="/common/utils.js"></script>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-open()-method" data-tested-assertations="following::ol[1]/li[9]/ol[1]/li[1] following::ol[1]/li[9]/ol[1]/li[2]" />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-send()-method" data-tested-assertations="following::code[contains(@title,'http-authorization')]/.." />
+  </head>
+  <body>
+    <div id="log"></div>
+    <script>
+      test(function() {
+        var client = new XMLHttpRequest(),
+          urlstart = 'www1.'+location.host + location.pathname.replace(/\/[^\/]*$/, '/')
+        client.withCredentials = true
+        user = token()
+        client.open("GET", location.protocol+'//'+urlstart + "resources/auth10/auth.py", false, user, 'pass')
+        client.setRequestHeader("x-user", user)
+        assert_throws_dom("NetworkError", function(){ client.send(null) })
+        assert_equals(client.responseText, '')
+        assert_equals(client.status, 0)
+        assert_equals(client.getResponseHeader('x-challenge'), null)
+      }, document.title)
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/send-authentication-basic-cors.htm b/test/wpt/tests/xhr/send-authentication-basic-cors.htm
new file mode 100644
index 00000000000..fcacdd5fec4
--- /dev/null
+++ b/test/wpt/tests/xhr/send-authentication-basic-cors.htm
@@ -0,0 +1,35 @@
+<!doctype html>
+<html>
+  <head>
+    <title>XMLHttpRequest: send() - "Basic" authenticated CORS requests with user name and password passed to open() (asserts failure)</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-open()-method" data-tested-assertations="following::ol[1]/li[9]/ol[1]/li[1] following::ol[1]/li[9]/ol[1]/li[2]" />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-send()-method" data-tested-assertations="following::code[contains(@title,'http-authorization')]/.." />
+  </head>
+  <body>
+    <div id="log"></div>
+    <script>
+      var test = async_test()
+      test.step(function() {
+        var client = new XMLHttpRequest(),
+          urlstart = 'www1.'+location.host + location.pathname.replace(/\/[^\/]*$/, '/')
+        client.withCredentials = true
+        client.open("GET", location.protocol+'//'+urlstart + "resources/auth1/corsenabled.py", true, 'user', 'pass')
+        client.setRequestHeader("x-user", 'user')
+        client.setRequestHeader("x-pass", 'pass')
+        client.onreadystatechange = function(){
+          if (client.readyState === 4) {
+            test.step(function(){
+              assert_equals(client.responseText, '')
+              assert_equals(client.status, 0)
+              assert_equals(client.getResponseHeader('x-challenge'), null)
+              test.done()
+            })
+          }
+        }
+        client.send(null)
+      }, document.title)
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/send-authentication-basic-repeat-no-args.htm b/test/wpt/tests/xhr/send-authentication-basic-repeat-no-args.htm
new file mode 100644
index 00000000000..38f1b20700a
--- /dev/null
+++ b/test/wpt/tests/xhr/send-authentication-basic-repeat-no-args.htm
@@ -0,0 +1,33 @@
+<!doctype html>
+<html>
+  <head>
+    <title>XMLHttpRequest: send() - "Basic" authenticated requests with user name and password passed to open() in first request, without in second</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <script src="/common/utils.js"></script>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-open()-method" data-tested-assertations="following::ol[1]/li[9]/ol[1]/li[1] following::ol[1]/li[9]/ol[1]/li[2]" />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-send()-method" data-tested-assertations="following::code[contains(@title,'http-authorization')]/.." />
+  </head>
+  <body>
+    <div id="log"></div>
+    <script>
+      test(function() {
+        var client = new XMLHttpRequest(),
+          urlstart = location.host + location.pathname.replace(/\/[^\/]*$/, '/'),
+          user = token()
+        client.open("GET", location.protocol+'//'+urlstart + "resources/auth11/auth.py", false, user, 'pass')
+        client.setRequestHeader("x-user", user)
+        client.send(null)
+        // Repeat request but *without* credentials in the open() call.
+        // Is the UA supposed to cache credentials from above request and use them? Yes.
+        client.open("GET", location.protocol+'//'+urlstart + "resources/auth11/auth.py", false)
+        client.setRequestHeader("x-user", user)
+        client.send(null)
+
+        assert_equals(client.responseText, user + "\n" + 'pass')
+        //assert_equals(client.getResponseHeader('x-challenge'), 'DID-NOT')
+
+      }, document.title)
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/send-authentication-basic-setrequestheader-and-arguments.htm b/test/wpt/tests/xhr/send-authentication-basic-setrequestheader-and-arguments.htm
new file mode 100644
index 00000000000..9915e8821c9
--- /dev/null
+++ b/test/wpt/tests/xhr/send-authentication-basic-setrequestheader-and-arguments.htm
@@ -0,0 +1,36 @@
+<!doctype html>
+<html>
+  <head>
+    <title>XMLHttpRequest: send() - "Basic" authenticated request using setRequestHeader() and open() arguments (asserts header wins)</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <script src="/common/utils.js"></script>
+    <!-- These spec references do not make much sense simply because the spec doesn't say very much about this.. -->
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-setrequestheader()-method" data-tested-assertations="following::ol[1]/li[6]" />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-send()-method" data-tested-assertations="following::code[contains(@title,'http-authorization')]/.." />
+  </head>
+  <body>
+    <div id="log"></div>
+    <script>
+      var test = async_test()
+      test.step(function() {
+        var client = new XMLHttpRequest(),
+          urlstart = location.host + location.pathname.replace(/\/[^\/]*$/, '/'),
+          user = token()
+        client.open("GET", location.protocol+'//'+urlstart + "resources/auth9/auth.py", false, 'open-' + user, 'open-pass')
+        client.setRequestHeader("x-user", user)
+        client.setRequestHeader('Authorization', 'Basic ' + btoa(user + ":pass"))
+        client.onreadystatechange = function () {
+          if (client.readyState < 4) {return}
+          test.step( function () {
+            assert_equals(client.responseText, user + '\npass')
+            assert_equals(client.status, 200)
+            assert_equals(client.getResponseHeader('x-challenge'), 'DID-NOT')
+            test.done()
+          })
+        }
+        client.send(null)
+      })
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/send-authentication-basic-setrequestheader-existing-session.htm b/test/wpt/tests/xhr/send-authentication-basic-setrequestheader-existing-session.htm
new file mode 100644
index 00000000000..6e68f098cf5
--- /dev/null
+++ b/test/wpt/tests/xhr/send-authentication-basic-setrequestheader-existing-session.htm
@@ -0,0 +1,53 @@
+<!doctype html>
+<html>
+  <head>
+    <title>XMLHttpRequest: send() - "Basic" authenticated request using setRequestHeader() when there is an existing session</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <script src="/common/utils.js"></script>
+    <!-- These spec references do not make much sense simply because the spec doesn't say very much about this.. -->
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-setrequestheader()-method" data-tested-assertations="following::ol[1]/li[6]" />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-send()-method" data-tested-assertations="following::code[contains(@title,'http-authorization')]/.." />
+  </head>
+  <body>
+    <div id="log"></div>
+    <script>
+      var test = async_test()
+      test.step(function() {
+        var client = new XMLHttpRequest(),
+          urlstart = location.host + location.pathname.replace(/\/[^\/]*$/, '/')
+        // Initial request: no information is known to the UA about whether resources/auth4/auth.py requires authentication,
+        // hence it first sends a normal request, gets a 401 response that will not be passed on to the JS, and sends a new
+        // request with an Authorization header before returning
+        // (Note: this test will only work as expected if run once per browsing session)
+        var open_user = token()
+        client.open("GET", location.protocol+'//'+urlstart + "resources/auth4/auth.py", false, open_user, 'open-pass')
+        client.setRequestHeader('X-User', open_user)
+        // initial request - this will get a 401 response and re-try with HTTP auth
+        client.send(null)
+        assert_true(client.responseText == (open_user + '\nopen-pass'), 'responseText should contain the right user and password')
+        assert_equals(client.status, 200)
+        assert_equals(client.getResponseHeader('x-challenge'), 'DID')
+        // Another request, this time user,pass is omitted and an Authorization header set explicitly
+        // Here the URL is known to require authentication (from the request above), and the UA has cached open-user:open-pass credentials
+        // However, these session credentials should now be overridden by the setRequestHeader() call so the UA should immediately
+        // send basic Authorization header with credentials user:pass. (This part is perhaps not well specified anywhere)
+        var user = token();
+        client.open("GET", location.protocol+'//'+urlstart + "resources/auth4/auth.py", true)
+        client.setRequestHeader("x-user", user)
+        client.setRequestHeader('Authorization', 'Basic ' + btoa(user + ":pass"))
+        client.onreadystatechange = function () {
+          if (client.readyState < 4) {return}
+          test.step( function () {
+            assert_equals(client.responseText, user + '\npass')
+            assert_equals(client.status, 200)
+            assert_equals(client.getResponseHeader('x-challenge'), 'DID-NOT')
+            test.done()
+          } )
+        }
+        client.send(null)
+      })
+    </script>
+    <p>Note: this test will only work as expected once per browsing session. Restart browser to re-test.</p>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/send-authentication-basic-setrequestheader.htm b/test/wpt/tests/xhr/send-authentication-basic-setrequestheader.htm
new file mode 100644
index 00000000000..84d0dd6b2cd
--- /dev/null
+++ b/test/wpt/tests/xhr/send-authentication-basic-setrequestheader.htm
@@ -0,0 +1,36 @@
+<!doctype html>
+<html>
+  <head>
+    <title>XMLHttpRequest: send() - "Basic" authenticated request using setRequestHeader()</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <script src="/common/utils.js"></script>
+    <!-- These spec references do not make much sense simply because the spec doesn't say very much about this.. -->
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-setrequestheader()-method" data-tested-assertations="following::ol[1]/li[6]" />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-send()-method" data-tested-assertations="following::code[contains(@title,'http-authorization')]/.." />
+  </head>
+  <body>
+    <div id="log"></div>
+    <script>
+      var test = async_test()
+      test.step(function() {
+        var client = new XMLHttpRequest(),
+          urlstart = location.host + location.pathname.replace(/\/[^\/]*$/, '/'),
+          user = token()
+        client.open("GET", location.protocol+'//'+urlstart + "resources/auth2/auth.py", false)
+        client.setRequestHeader("x-user", user)
+        client.setRequestHeader('Authorization', 'Basic ' + btoa(user + ":pass"))
+        client.onreadystatechange = function () {
+          if (client.readyState < 4) {return}
+          test.step( function () {
+            assert_equals(client.responseText, user + '\npass')
+            assert_equals(client.status, 200)
+            assert_equals(client.getResponseHeader('x-challenge'), 'DID-NOT')
+            test.done()
+          } )
+        }
+        client.send(null)
+      })
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/send-authentication-basic.htm b/test/wpt/tests/xhr/send-authentication-basic.htm
new file mode 100644
index 00000000000..ae3ee571141
--- /dev/null
+++ b/test/wpt/tests/xhr/send-authentication-basic.htm
@@ -0,0 +1,27 @@
+<!doctype html>
+<html>
+  <head>
+    <title>XMLHttpRequest: send() - "Basic" authenticated requests with user name and password passed to open()</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <script src="/common/utils.js"></script>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-open()-method" data-tested-assertations="following::ol[1]/li[9]/ol[1]/li[1] following::ol[1]/li[9]/ol[1]/li[2]" />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-send()-method" data-tested-assertations="following::code[contains(@title,'http-authorization')]/.." />
+  </head>
+  <body>
+    <div id="log"></div>
+    <script>
+      test(function() {
+        var client = new XMLHttpRequest(),
+          urlstart = location.host + location.pathname.replace(/\/[^\/]*$/, '/'),
+          user = token();
+        client.open("GET", location.protocol+'//'+urlstart + "resources/auth1/auth.py", false, user, 'pass')
+        client.setRequestHeader("x-user", user)
+        client.send(null)
+        assert_equals(client.responseText, user + "\n" + 'pass')
+        assert_equals(client.getResponseHeader('x-challenge'), 'DID')
+      }, document.title)
+    </script>
+    <p>Note: this test will only work as expected once per browsing session. Restart browser to re-test.</p>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/send-authentication-competing-names-passwords.htm b/test/wpt/tests/xhr/send-authentication-competing-names-passwords.htm
new file mode 100644
index 00000000000..bc6755c7d6d
--- /dev/null
+++ b/test/wpt/tests/xhr/send-authentication-competing-names-passwords.htm
@@ -0,0 +1,50 @@
+<!doctype html>
+<html>
+  <head>
+    <title>XMLHttpRequest: send() - "Basic" authenticated requests with competing user name/password options</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <script src="/common/utils.js"></script>
+  </head>
+  <body>
+    <div id="log"></div>
+    <script>
+      function request(user1, pass1, user2, pass2, name) {
+        test(function() {
+          const client = new XMLHttpRequest(),
+                userwin = user2 || user1,
+                passwin = pass2 || pass1;
+          let urlstart = "";
+          if (user1 || pass1) {
+            urlstart = "http://";
+            if (user1) {
+              urlstart += user1;
+            }
+            if (pass1) {
+              urlstart += ":" + pass1;
+            }
+            urlstart += "@" + location.host + location.pathname.replace(/\/[^\/]*$/, '/');
+          }
+          client.open("GET", urlstart + "resources/authentication.py", false, user2, pass2);
+          client.setRequestHeader("x-user", userwin);
+          client.send(null);
+          assert_equals(client.responseText, ((userwin||'') + "\n" + (passwin||'')), 'responseText should contain the right user and password');
+        }, "XMLHttpRequest user/pass options: " + name);
+      }
+      // Cannot have just a password
+      request(null, null, token(), null, "user in open()");
+      request(null, null, token(), token(), "user/pass in open()");
+      request(null, null, token(), token(), "another user/pass in open(); must override cached credentials from previous test");
+      request(null, token(), token(), null, "pass in URL, user in open()");
+      request(null, token(), token(), token(), "pass in URL, user/pass in open()");
+      request(token(), null, null, null, "user in URL");
+      request(token(), null, null, token(), "user in URL, pass in open()");
+      request(token(), token(), null, null, "user/pass in URL");
+      request(token(), null, token(), null, "user in URL and open()");
+      request(token(), null, token(), token(), "user in URL; user/pass in open()");
+      request(token(), token(), token(), null, "user/pass in URL; user in open()");
+      request(token(), token(), null, token(), "user/pass in URL; pass in open()");
+      request(token(), token(), token(), token(), "user/pass in URL and open()");
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/send-authentication-cors-basic-setrequestheader.htm b/test/wpt/tests/xhr/send-authentication-cors-basic-setrequestheader.htm
new file mode 100644
index 00000000000..de9c5e54303
--- /dev/null
+++ b/test/wpt/tests/xhr/send-authentication-cors-basic-setrequestheader.htm
@@ -0,0 +1,30 @@
+<!doctype html>
+<html>
+  <head>
+    <title>XMLHttpRequest: send() - "Basic" authenticated CORS request using setRequestHeader() (expects to succeed)</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <script src="/common/utils.js"></script>
+  </head>
+  <body>
+    <div id="log"></div>
+    <script>
+      async_test(test => {
+        var client = new XMLHttpRequest(),
+            urlstart = location.host + location.pathname.replace(/\/[^\/]*$/, '/'),
+            user = token()
+        client.open("GET", location.protocol+'//www1.'+urlstart + "resources/auth2/corsenabled.py", false)
+        client.withCredentials = true
+        client.setRequestHeader("x-user", user)
+        client.setRequestHeader("x-pass", 'pass')
+        client.setRequestHeader('Authorization', 'Basic ' + btoa(user + ":pass"))
+        client.onload = test.step_func_done(() => {
+            assert_equals(client.responseText, user + '\npass', 'responseText should contain the right user and password')
+            assert_equals(client.status, 200)
+            assert_equals(client.getResponseHeader('x-challenge'), 'DID-NOT')
+        })
+        client.send(null)
+      })
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/send-authentication-cors-setrequestheader-no-cred.htm b/test/wpt/tests/xhr/send-authentication-cors-setrequestheader-no-cred.htm
new file mode 100644
index 00000000000..14edf5bd778
--- /dev/null
+++ b/test/wpt/tests/xhr/send-authentication-cors-setrequestheader-no-cred.htm
@@ -0,0 +1,61 @@
+<!doctype html>
+<html>
+  <head>
+    <title>XMLHttpRequest: send() - "Basic" authenticated CORS request using setRequestHeader() but not setting withCredentials (expects to succeed)</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <script src="/common/utils.js"></script>
+    <!-- These spec references do not make much sense simply because the spec doesn't say very much about this.. -->
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-setrequestheader()-method" data-tested-assertations="following::ol[1]/li[6]" />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-send()-method" data-tested-assertations="following::code[contains(@title,'http-authorization')]/.." />
+  </head>
+  <body>
+    <div id="log"></div>
+    <script>
+    function doTest(desc, pathsuffix, conditionsFunc, errorFunc, endFunc) {
+      var test = async_test(desc)
+      test.step(function() {
+        var client = new XMLHttpRequest(),
+            urlstart = location.host + location.pathname.replace(/\/[^\/]*$/, '/'),
+            user = token()
+        client.open("GET", location.protocol + "//www1." + urlstart + "resources/" + pathsuffix, false)
+        client.setRequestHeader("x-user", user)
+        client.setRequestHeader("x-pass", 'pass')
+        client.setRequestHeader("Authorization", "Basic " + btoa(user + ":pass"))
+        client.onerror = test.step_func(errorFunc)
+        client.onreadystatechange = test.step_func(function () {
+          if(client.readyState < 4) {return}
+          conditionsFunc(client, test, user)
+        })
+        if(endFunc) {
+          client.onloadend = test.step_func(endFunc)
+        }
+        client.send(null)
+      })
+    }
+
+    doTest("CORS request with setRequestHeader auth to URL accepting Authorization header", "auth7/corsenabled.py", function (client, test, user) {
+      assert_true(client.responseText == (user + "\npass"), "responseText should contain the right user and password")
+      assert_equals(client.status, 200)
+      assert_equals(client.getResponseHeader("x-challenge"), "DID-NOT")
+      test.done()
+    }, function(){
+      assert_unreached("Cross-domain request is permitted and should not cause an error")
+      this.done()
+    })
+
+    var errorFired = false;
+    doTest("CORS request with setRequestHeader auth to URL NOT accepting Authorization header", "auth8/corsenabled-no-authorize.py", function (client, test, user) {
+      assert_equals(client.responseText, '')
+      assert_equals(client.status, 0)
+    }, function(e){
+      errorFired = true
+      assert_equals(e.type, 'error', 'Error event fires when Authorize is a user-set header but not allowed by the CORS endpoint')
+    }, function() {
+      assert_true(errorFired, 'The error event should fire')
+      this.done()
+    })
+
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/send-authentication-existing-session-manual.htm b/test/wpt/tests/xhr/send-authentication-existing-session-manual.htm
new file mode 100644
index 00000000000..a80efd6e843
--- /dev/null
+++ b/test/wpt/tests/xhr/send-authentication-existing-session-manual.htm
@@ -0,0 +1,33 @@
+<!doctype html>
+<html>
+  <head>
+    <title>XMLHttpRequest: send() - "Basic" authenticated requests with user name and password from interactive session</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <script src="/common/utils.js"></script>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-send()-method" data-tested-assertations="following::code[contains(@title,'http-authorization')]/.." />
+  </head>
+  <body>
+    <p>Please follow these steps to complete the test:</p>
+    <script>var user = token();</script>
+    <ol>
+      <li>Load <a href="resources/auth3/auth.py">page</a> and authenticate with username "<script>document.write(user)</script>" and password "pass"</li>
+      <li>Go back</li>
+      <li>Click <button onclick="location.href = location.href + '?dotest&user=' + user">complete test</button></li>
+    </ol>
+    <div id="log"></div>
+    <script>
+    if (location.search.indexOf('?dotest') != -1) {
+      test(function() {
+        var user = location.search.slice(location.search.indexOf('&user=') + 6),
+          client = new XMLHttpRequest(),
+          urlstart = location.host + location.pathname.replace(/\/[^\/]*$/, '/')
+        client.open("GET", location.protocol+'//'+urlstart + "resources/auth3/auth.py", false)
+        client.send(null)
+        assert_equals(client.responseText, user + "\n" + 'pass')
+        assert_equals(client.getResponseHeader('x-challenge'), 'DID-NOT')
+      }, document.title)
+    }
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/send-authentication-prompt-2-manual.htm b/test/wpt/tests/xhr/send-authentication-prompt-2-manual.htm
new file mode 100644
index 00000000000..023a40a63d0
--- /dev/null
+++ b/test/wpt/tests/xhr/send-authentication-prompt-2-manual.htm
@@ -0,0 +1,25 @@
+<!doctype html>
+<html>
+  <head>
+    <title>XMLHttpRequest: WWW-Authenticate challenge when user,pass are not passed to open()</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-send()-method" data-tested-assertations="following::code[contains(@title,'http-authorization')]/.." />
+  </head>
+  <body>
+    <p>Please follow these steps to complete the test:</p>
+    <ol>
+      <li>If you are prompted for user name and password, type in 'usr' and 'secret'</li>
+    </ol>
+    <div id="log"></div>
+    <script>
+      test(function() {
+        var client = new XMLHttpRequest(),
+          urlstart = location.host + location.pathname.replace(/\/[^\/]*$/, '/')
+        client.open("GET", location.protocol+'//'+urlstart + "resources/auth6/auth.py", false)
+        client.send(null)
+        assert_equals(client.responseText, 'usr' + "\n" + 'secret')
+      }, document.title)
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/send-authentication-prompt-manual.htm b/test/wpt/tests/xhr/send-authentication-prompt-manual.htm
new file mode 100644
index 00000000000..a836c59e2d1
--- /dev/null
+++ b/test/wpt/tests/xhr/send-authentication-prompt-manual.htm
@@ -0,0 +1,25 @@
+<!doctype html>
+<html>
+  <head>
+    <title>XMLHttpRequest: send() - "Basic" authentication gets 401 response</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-send()-method" data-tested-assertations="following::code[contains(@title,'http-authorization')]/.." />
+  </head>
+  <body>
+    <p>Please follow these steps to complete the test:</p>
+    <ol>
+      <li>If you are prompted for user name and password, type in 'usr' and 'secret'</li>
+    </ol>
+    <div id="log"></div>
+    <script>
+      test(function() {
+        var client = new XMLHttpRequest(),
+          urlstart = location.host + location.pathname.replace(/\/[^\/]*$/, '/')
+        client.open("GET", location.protocol+'//'+urlstart + "resources/auth5/auth.py", false, 'usr', 'wrongpassword')
+        client.send(null)
+        assert_equals(client.responseText, 'usr' + "\n" + 'secret')
+      }, document.title)
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/send-blob-with-no-mime-type.html b/test/wpt/tests/xhr/send-blob-with-no-mime-type.html
new file mode 100644
index 00000000000..e7ab989fdc6
--- /dev/null
+++ b/test/wpt/tests/xhr/send-blob-with-no-mime-type.html
@@ -0,0 +1,61 @@
+<!DOCTYPE html>
+<html>
+<head>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-send()-method" data-tested-assertations="following::ol[1]/li[4] following::ol[1]/li[4]/dl[1]/dd[2]/p[3]"/>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-status-attribute"  data-tested-assertations="following::ol[1]/li[3]"/>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-responsetype-attribute"  data-tested-assertations="following::ol[1]/li[4]"/>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-response-attribute"  data-tested-assertations="following::a[contains(@href,'#blob-response-entity-body')]/.."/>
+
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <title>XMLHttpRequest: The send() method: Blob data with no mime type</title>
+</head>
+
+<body>
+    <div id="log"></div>
+
+    <script type="text/javascript">
+        var blobTests = [
+            ["no mime type", new Blob(["data"])],
+            ["invalid mime type", new Blob(["data"], {type: "Invalid \r\n mime \r\n type"})]
+        ];
+
+        function doSyncTest(testItem, method) {
+            test(function() {
+                var xhr = new XMLHttpRequest();
+                xhr.open(method, "./resources/content.py", false);
+                xhr.send(testItem[1]);
+
+                assert_equals(xhr.getResponseHeader("X-Request-Content-Length"), "4");
+                assert_equals(xhr.getResponseHeader("X-Request-Content-Type"), "NO");
+            }, "Synchronous blob loading with " + testItem[0] + " [" + method + "]");
+        }
+
+        function doAsyncTest(testItem, method) {
+            var atest = async_test("Asynchronous blob loading with " + testItem[0] + " [" + method + "]");
+            atest.step(function() {
+                var xhr = new XMLHttpRequest();
+                xhr.onreadystatechange = function() {
+                    if (xhr.readyState == 4) {
+                        atest.step(function() {
+                            assert_equals(xhr.getResponseHeader("X-Request-Content-Length"), "4");
+                            assert_equals(xhr.getResponseHeader("X-Request-Content-Type"), "NO");
+                        });
+                        atest.done();
+                    }
+                }
+                xhr.open(method, "./resources/content.py", true);
+                xhr.send(testItem[1]);
+            });
+        }
+
+        blobTests.forEach(function(item){
+            doSyncTest(item, "POST");
+            doAsyncTest(item, "POST");
+
+            doSyncTest(item, "PUT");
+            doAsyncTest(item, "PUT");
+        });
+    </script>
+</body>
+</html>
diff --git a/test/wpt/tests/xhr/send-conditional-cors.htm b/test/wpt/tests/xhr/send-conditional-cors.htm
new file mode 100644
index 00000000000..f46f18a1db4
--- /dev/null
+++ b/test/wpt/tests/xhr/send-conditional-cors.htm
@@ -0,0 +1,42 @@
+<!doctype html>
+<title>XMLHttpRequest: send() - conditional cross-origin requests</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=/cors/support.js?pipe=sub></script>
+<div id=log></div>
+<script>
+function request(withCORS, desc) {
+  async_test(t => {
+    const client = new XMLHttpRequest,
+          identifier = Math.random(),
+          cors = withCORS ? "&cors=yes" : "",
+          url = CROSSDOMAIN + "resources/conditional.py?tag=" + identifier + cors
+    client.onload = t.step_func(() => {
+      assert_equals(client.status, 200)
+      assert_equals(client.statusText, "OK")
+      assert_equals(client.responseText, "MAYBE NOT")
+
+      if(withCORS) {
+        client.onload = t.step_func_done(() => {
+          assert_equals(client.status, 304)
+          assert_equals(client.statusText, "SUPERCOOL")
+          assert_equals(client.responseText, "")
+        })
+      } else {
+        client.onload = null
+        client.onerror = t.step_func_done(() => {
+          assert_equals(client.status, 0)
+          assert_equals(client.statusText, "")
+        })
+      }
+      client.open("GET", url)
+      client.setRequestHeader("If-None-Match", identifier)
+      client.send()
+    })
+    client.open("GET", url)
+    client.send()
+  }, desc)
+}
+request(false, "304 without appropriate CORS header")
+request(true, "304 with appropriate CORS header")
+</script>
diff --git a/test/wpt/tests/xhr/send-conditional.htm b/test/wpt/tests/xhr/send-conditional.htm
new file mode 100644
index 00000000000..cbe3e94a425
--- /dev/null
+++ b/test/wpt/tests/xhr/send-conditional.htm
@@ -0,0 +1,34 @@
+<!doctype html>
+<html>
+  <head>
+    <title>XMLHttpRequest: send() - conditional requests</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-send()-method" data-tested-assertations="following::code[contains(text(),'Modified')]/.." />
+  </head>
+  <body>
+    <div id="log"></div>
+    <script>
+      function request(type) {
+        test(function() {
+          var client = new XMLHttpRequest,
+          identifier = type == "tag" ? Math.random() : new Date().toGMTString(),
+          url = "resources/conditional.py?" + type + "=" + identifier
+          client.open("GET", url, false)
+          client.send(null)
+          assert_equals(client.status, 200)
+          assert_equals(client.statusText, "OK")
+          assert_equals(client.responseText, "MAYBE NOT")
+          client.open("GET", url, false)
+          client.setRequestHeader(type == "tag" ? "If-None-Match" : "If-Modified-Since", identifier)
+          client.send(null)
+          assert_equals(client.status, 304)
+          assert_equals(client.statusText, "SUPERCOOL")
+          assert_equals(client.responseText, "")
+        }, document.title + " (" + type + ")")
+      }
+      request("tag")
+      request("date")
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/send-content-type-charset.htm b/test/wpt/tests/xhr/send-content-type-charset.htm
new file mode 100644
index 00000000000..a968bb3f4d4
--- /dev/null
+++ b/test/wpt/tests/xhr/send-content-type-charset.htm
@@ -0,0 +1,115 @@
+<!doctype html>
+<html>
+  <head>
+    <title>XMLHttpRequest: send() - charset parameter of Content-Type</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+  </head>
+  <body>
+    <div id="log"></div>
+    <script>
+      function request(input, output, title) {
+        title = title || document.title + ' - ' + input;
+        test(function() {
+        var client = new XMLHttpRequest()
+        client.open("POST", "resources/content.py", false)
+        if(input !== null)
+          client.setRequestHeader("Content-Type", input)
+        client.send("TEST")
+        assert_equals(client.responseText, "TEST")
+        assert_equals(client.getResponseHeader("x-request-content-type"), output)
+        }, title)
+      }
+
+      request(
+        "text; charset=ascii",
+        "text; charset=ascii",
+        "header with invalid MIME type is not changed"
+      )
+      request(
+        "",
+        "",
+        "header with invalid MIME type (empty string) is not changed"
+      )
+      request(
+        "charset=ascii",
+        "charset=ascii",
+        "known charset but bogus header - missing MIME type"
+      )
+      request(
+        "charset=bogus",
+        "charset=bogus",
+        "bogus charset and bogus header - missing MIME type"
+      )
+      request(
+        "text/plain;charset=utf-8",
+        "text/plain;charset=utf-8",
+        "If charset= param is UTF-8 (case-insensitive), it should not be changed"
+      )
+      request(
+        "text/x-pink-unicorn",
+        "text/x-pink-unicorn",
+        "If no charset= param is given, implementation should not add one - unknown MIME"
+      )
+      request(
+        "text/plain",
+        "text/plain",
+        "If no charset= param is given, implementation should not add one - known MIME"
+      )
+      request(
+        "text/plain;  hi=bye",
+        "text/plain;  hi=bye",
+        "If no charset= param is given, implementation should not add one - known MIME, unknown param, two spaces"
+      )
+      request(
+        "text/x-thepiano;charset= waddup",
+        "text/x-thepiano;charset=UTF-8",
+        "charset given but wrong, fix it (unknown MIME, bogus charset)"
+      )
+      request(
+        "text/plain;charset=utf-8;charset=waddup",
+        "text/plain;charset=utf-8;charset=waddup",
+        "If charset= param is UTF-8 (case-insensitive), it should not be changed (bogus charset)"
+      )
+      request(
+        "text/plain;charset=shift-jis",
+        "text/plain;charset=UTF-8",
+        "charset given but wrong, fix it (known MIME, actual charset)"
+      )
+      request(
+        "text/x-pink-unicorn; charset=windows-1252; charset=bogus; notrelated; charset=ascii",
+        "text/x-pink-unicorn;charset=UTF-8",
+        "Multiple non-UTF-8 charset parameters deduplicate, bogus parameter dropped"
+      )
+      request(
+        null,
+        "text/plain;charset=UTF-8",
+        "No content type set, give MIME and charset"
+      )
+      request(
+        "text/plain;charset= utf-8",
+        "text/plain;charset=UTF-8",
+        "charset with leading space that is UTF-8 does change")
+      request(
+        "text/plain;charset=utf-8 ;x=x",
+        "text/plain;charset=utf-8 ;x=x",
+        "charset with trailing space that is UTF-8 does not change");
+      request(
+        "text/plain;charset=\"utf-8\"",
+        "text/plain;charset=\"utf-8\"",
+        "charset in double quotes that is UTF-8 does not change")
+      request(
+        "text/plain;charset=\" utf-8\"",
+        "text/plain;charset=UTF-8",
+        "charset in double quotes with space")
+      request(
+        "text/plain;charset=\"u\\t\\f-8\"",
+        "text/plain;charset=\"u\\t\\f-8\"",
+        "charset in double quotes with backslashes that is UTF-8 does not change")
+      request(
+        "YO/yo;charset=x;yo=YO; X=y",
+        "yo/yo;charset=UTF-8;yo=YO;x=y",
+        "unknown parameters need to be preserved")
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/send-content-type-string.htm b/test/wpt/tests/xhr/send-content-type-string.htm
new file mode 100644
index 00000000000..6c2c00823c6
--- /dev/null
+++ b/test/wpt/tests/xhr/send-content-type-string.htm
@@ -0,0 +1,26 @@
+<!doctype html>
+<html>
+  <head>
+    <title>XMLHttpRequest: send() - Content-Type</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#dom-XMLHttpRequest-send-document" data-tested-assertations="following::p[1] following::p[2] following::p[3]" />
+  </head>
+  <body>
+    <div id="log"></div>
+    <script>
+      function request(data, expected_type) {
+        test(function() {
+          var client = new XMLHttpRequest()
+          client.open("POST", "resources/content.py", false)
+          client.send(data)
+          assert_equals(client.getResponseHeader("x-request-content-type"), expected_type)
+        })
+      }
+      request("TEST", "text/plain;charset=UTF-8")
+      function init(fr) { request(fr.contentDocument, fr.getAttribute("data-t")) }
+    </script>
+    <iframe src="resources/win-1252-xml.py" onload="init(this)" data-t="application/xml;charset=UTF-8"></iframe>
+    <iframe src="resources/win-1252-html.py" onload="init(this)" data-t="text/html;charset=UTF-8"></iframe>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/send-data-arraybuffer.any.js b/test/wpt/tests/xhr/send-data-arraybuffer.any.js
new file mode 100644
index 00000000000..71933d08978
--- /dev/null
+++ b/test/wpt/tests/xhr/send-data-arraybuffer.any.js
@@ -0,0 +1,31 @@
+// META: title=XMLHttpRequest.send(arraybuffer)
+
+var test = async_test();
+test.step(function()
+{
+    var xhr = new XMLHttpRequest();
+    var buf = new ArrayBuffer(5);
+    var arr = new Uint8Array(buf);
+    arr[0] = 0x48;
+    arr[1] = 0x65;
+    arr[2] = 0x6c;
+    arr[3] = 0x6c;
+    arr[4] = 0x6f;
+
+    xhr.onreadystatechange = function()
+    {
+        if (xhr.readyState == 4)
+        {
+            test.step(function()
+            {
+                assert_equals(xhr.status, 200);
+                assert_equals(xhr.response, "Hello");
+
+                test.done();
+            });
+        }
+    };
+
+    xhr.open("POST", "./resources/content.py", true);
+    xhr.send(buf);
+});
diff --git a/test/wpt/tests/xhr/send-data-arraybufferview.any.js b/test/wpt/tests/xhr/send-data-arraybufferview.any.js
new file mode 100644
index 00000000000..a3985b4701d
--- /dev/null
+++ b/test/wpt/tests/xhr/send-data-arraybufferview.any.js
@@ -0,0 +1,18 @@
+// META: title=XMLHttpRequest.send(arraybufferview)
+
+var test = async_test();
+test.step(function()
+{
+    var str = "Hello";
+    var bytes = str.split("").map(function(ch) { return ch.charCodeAt(0); });
+    var xhr = new XMLHttpRequest();
+    var arr = new Uint8Array(bytes);
+
+    xhr.onload = test.step_func_done(function() {
+        assert_equals(xhr.status, 200);
+        assert_equals(xhr.response, str);
+    });
+
+    xhr.open("POST", "./resources/content.py", true);
+    xhr.send(arr);
+});
diff --git a/test/wpt/tests/xhr/send-data-blob.htm b/test/wpt/tests/xhr/send-data-blob.htm
new file mode 100644
index 00000000000..5285fc180cc
--- /dev/null
+++ b/test/wpt/tests/xhr/send-data-blob.htm
@@ -0,0 +1,62 @@
+<!DOCTYPE html>
+<html>
+<head>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-send()-method" data-tested-assertations="following::ol[1]/li[4] following::ol[1]/li[4]/dl[1]/dd[2]/p[3]"/>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-status-attribute"  data-tested-assertations="following::ol[1]/li[3]"/>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-responsetype-attribute"  data-tested-assertations="following::ol[1]/li[4]"/>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-response-attribute"  data-tested-assertations="following::a[contains(@href,'#blob-response-entity-body')]/.."/>
+
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <title>XMLHttpRequest: The send() method: Blob data</title>
+</head>
+
+<body>
+    <div id="log"></div>
+
+    <script type="text/javascript">
+        var test = async_test();
+
+        test.step(function()
+        {
+            var xhr = new XMLHttpRequest();
+            var xhr2 = new XMLHttpRequest();
+
+            var content = "Hello";
+            var blob;
+
+            xhr.onreadystatechange = function()
+            {
+                if (xhr.readyState == 4)
+                {
+                    test.step(function()
+                    {
+                        blob = xhr.response;
+                        assert_true(blob instanceof Blob, "Blob from XHR Response");
+
+                        xhr2.open("POST", "./resources/content.py", true);
+                        xhr2.send(blob);
+                    });
+                }
+            }
+
+            xhr2.onreadystatechange = function()
+            {
+                if (xhr2.readyState == 4)
+                {
+                    test.step(function()
+                    {
+                        assert_equals(xhr2.status, 200);
+                        assert_equals(xhr2.response, content);
+                        test.done();
+                    });
+                }
+            };
+
+            xhr.open("GET", "./resources/content.py?content=" + content, true);
+            xhr.responseType = "blob";
+            xhr.send();
+        });
+    </script>
+</body>
+</html>
diff --git a/test/wpt/tests/xhr/send-data-es-object.any.js b/test/wpt/tests/xhr/send-data-es-object.any.js
new file mode 100644
index 00000000000..92286bca6dd
--- /dev/null
+++ b/test/wpt/tests/xhr/send-data-es-object.any.js
@@ -0,0 +1,58 @@
+// META: title=XMLHttpRequest.send(ES object)
+
+function do_test(obj, expected, name) {
+  var test = async_test(name)
+  test.step(function() {
+    var client = new XMLHttpRequest()
+    client.onload = test.step_func(function () {
+      assert_equals(client.responseText, expected)
+      test.done()
+    });
+    client.open('POST', 'resources/content.py')
+    if (expected.exception) {
+      if (expected.exception.identity) {
+        assert_throws_exactly(expected.exception.identity,
+                              function(){client.send(obj)})
+      } else {
+        assert_throws_js(expected.exception.ctor,
+                         function(){client.send(obj)})
+      }
+      test.done()
+    } else {
+      client.send(obj)
+    }
+  });
+}
+
+do_test({}, '[object Object]', 'sending a plain empty object')
+do_test(Math, '[object Math]', 'sending the ES Math object')
+do_test(new XMLHttpRequest, '[object XMLHttpRequest]', 'sending a new XHR instance')
+do_test(new ReadableStream, '[object ReadableStream]', 'sending a new ReadableStream instance')
+do_test({toString:function(){}}, 'undefined', 'sending object that stringifies to undefined')
+do_test({toString:function(){return null}}, 'null', 'sending object that stringifies to null')
+var ancestor = {toString: function(){
+  var ar=[]
+  for (var prop in this) {
+    if (this.hasOwnProperty(prop)) {
+      ar.push(prop+'='+this[prop])
+    }
+  };
+  return ar.join('&')
+}};
+
+var myObj = Object.create(ancestor, {foo:{value:1, enumerable: true},  bar:{value:'foo', enumerable:true}})
+do_test(myObj, 'foo=1&bar=foo', 'object that stringifies to query string')
+
+var myFakeJSON = {a:'a', b:'b', toString:function(){ return JSON.stringify(this, function(key, val){ return key ==='toString'?undefined:val; }) }}
+do_test(myFakeJSON, '{"a":"a","b":"b"}', 'object that stringifies to JSON string')
+
+var myFakeDoc1 = {valueOf:function(){return document}}
+do_test(myFakeDoc1, '[object Object]', 'object whose valueOf() returns a document - ignore valueOf(), stringify')
+
+var myFakeDoc2 = {toString:function(){return document}}
+var expectedError = self.GLOBAL.isWorker() ? ReferenceError : TypeError;
+do_test(myFakeDoc2, {exception: { ctor: expectedError } }, 'object whose toString() returns a document, expected to throw')
+
+var err = {name:'FooError', message:'bar'};
+var myThrower = {toString:function(){throw err;}};
+do_test(myThrower, {exception: { identity: err }}, 'object whose toString() throws, expected to throw')
diff --git a/test/wpt/tests/xhr/send-data-formdata.any.js b/test/wpt/tests/xhr/send-data-formdata.any.js
new file mode 100644
index 00000000000..6ff04793ea6
--- /dev/null
+++ b/test/wpt/tests/xhr/send-data-formdata.any.js
@@ -0,0 +1,21 @@
+// META: title=XMLHttpRequest.send(formdata)
+
+var test = async_test();
+test.step(function()
+{
+    var xhr = new XMLHttpRequest();
+    var form = new FormData();
+    form.append("id", "0");
+    form.append("value", "zero");
+
+    xhr.onreadystatechange = test.step_func(() => {
+        if (xhr.readyState == 4) {
+            assert_equals(xhr.status, 200);
+            assert_equals(xhr.response, "id:0;value:zero;");
+            test.done();
+        }
+    });
+
+    xhr.open("POST", "./resources/form.py", true);
+    xhr.send(form);
+});
diff --git a/test/wpt/tests/xhr/send-data-sharedarraybuffer.any.js b/test/wpt/tests/xhr/send-data-sharedarraybuffer.any.js
new file mode 100644
index 00000000000..79774c3d30b
--- /dev/null
+++ b/test/wpt/tests/xhr/send-data-sharedarraybuffer.any.js
@@ -0,0 +1,27 @@
+// META: title=XMLHttpRequest.send(sharedarraybuffer)
+
+test(() => {
+    const xhr = new XMLHttpRequest();
+    // See https://github.com/whatwg/html/issues/5380 for why not `new SharedArrayBuffer()`
+    const buf = new WebAssembly.Memory({ shared:true, initial:1, maximum:1 }).buffer;
+
+    xhr.open("POST", "./resources/content.py", true);
+    assert_throws_js(TypeError, function() {
+        xhr.send(buf)
+    });
+}, "sending a SharedArrayBuffer");
+
+["Int8Array", "Uint8Array", "Uint8ClampedArray", "Int16Array", "Uint16Array",
+ "Int32Array", "Uint32Array", "BigInt64Array", "BigUint64Array",
+ "Float32Array", "Float64Array", "DataView"].forEach((type) => {
+    test(() => {
+        const xhr = new XMLHttpRequest();
+        // See https://github.com/whatwg/html/issues/5380 for why not `new SharedArrayBuffer()`
+        const arr = new self[type](new WebAssembly.Memory({ shared:true, initial:1, maximum:1 }).buffer);
+
+        xhr.open("POST", "./resources/content.py", true);
+        assert_throws_js(TypeError, function() {
+            xhr.send(arr)
+        });
+    }, `sending a ${type} backed by a SharedArrayBuffer`);
+});
diff --git a/test/wpt/tests/xhr/send-data-string-invalid-unicode.any.js b/test/wpt/tests/xhr/send-data-string-invalid-unicode.any.js
new file mode 100644
index 00000000000..d9dc5a6bcf8
--- /dev/null
+++ b/test/wpt/tests/xhr/send-data-string-invalid-unicode.any.js
@@ -0,0 +1,46 @@
+// META: title=XMLHttpRequest.send(invalidUnicodeString)
+
+const LEFT_SURROGATE = '\ud83d';
+const RIGHT_SURROGATE = '\udc94';
+
+// Unmatched surrogates should be replaced with the unicode replacement
+// character, 0xFFFD. '$' in these templates is replaced with one of
+// LEFT_SURROGATE or RIGHT_SURROGATE according to the test.
+const TEMPLATES = {
+  '$': [239, 191, 189],
+  '$ab': [239, 191, 189, 97, 98],
+  'a$b': [97, 239, 191, 189, 98],
+  'ab$': [97, 98, 239, 191, 189],
+};
+
+for (const surrogate of [LEFT_SURROGATE, RIGHT_SURROGATE]) {
+  for (const [template, expected] of Object.entries(TEMPLATES)) {
+    const invalidString = template.replace('$', surrogate);
+    const printableString = template.replace(
+        '$', '\\u{' + surrogate.charCodeAt(0).toString(16) + '}');
+    async_test(t => {
+      xhrSendStringAndCheckResponseBody(t, invalidString, expected);
+    }, `invalid unicode '${printableString}' should be fixed with ` +
+               `replacement character`);
+  }
+}
+
+// For the sake of completeness, verify that matched surrogates work.
+async_test(t => {
+  xhrSendStringAndCheckResponseBody(t, LEFT_SURROGATE + RIGHT_SURROGATE,
+                                    [240, 159, 146, 148]);
+}, 'valid unicode should be sent correctly');
+
+function xhrSendStringAndCheckResponseBody(t, string, expected) {
+  const xhr = new XMLHttpRequest();
+  xhr.responseType = 'arraybuffer';
+  xhr.onload = t.step_func(() => {
+    assert_equals(xhr.status, 200, 'status should be 200');
+    const actualBody = new Uint8Array(xhr.response);
+    assert_array_equals(actualBody, expected, 'content should match');
+    t.done();
+  });
+  xhr.onerror = t.unreached_func('no error should occur');
+  xhr.open('POST', 'resources/content.py', true);
+  xhr.send(string);
+}
diff --git a/test/wpt/tests/xhr/send-data-unexpected-tostring.htm b/test/wpt/tests/xhr/send-data-unexpected-tostring.htm
new file mode 100644
index 00000000000..203c3866683
--- /dev/null
+++ b/test/wpt/tests/xhr/send-data-unexpected-tostring.htm
@@ -0,0 +1,56 @@
+<!doctype html>
+<meta charset=utf-8>
+<title>XMLHttpRequest: passing objects that interfere with the XHR instance to send()</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<link rel="help" href="https://xhr.spec.whatwg.org/#the-send()-method" data-tested-assertations="following::ol/li[4]" />
+<link rel="help" href="https://webidl.spec.whatwg.org/#es-union" data-tested-assertations="following::ol/li[16]" />
+
+
+<div id="log"></div>
+
+<script>
+  var test1 = async_test('abort() called from data stringification')
+  test1.step(function() {
+    var client = new XMLHttpRequest()
+    var objAbortsOnStringification = {toString:function(){
+      client.abort();
+    }}
+    client.open('POST', 'resources/content.py')
+    client.send(objAbortsOnStringification)
+    assert_equals(client.readyState, 1)
+    test1.done()
+  });
+
+  var test2 = async_test('open() called from data stringification')
+  test2.step(function() {
+    var client = new XMLHttpRequest()
+    var objOpensOnStringification = {toString:function(){
+      client.open('POST', 'resources/status.py?text=second_open_wins');
+    }}
+    client.onloadend = test2.step_func(function(){
+      assert_equals(client.statusText, 'second_open_wins')
+      test2.done()
+    })
+    client.open('POST', 'resources/status.py?text=first_open_wins')
+    client.send(objOpensOnStringification)
+  });
+
+  var test3 = async_test('send() called from data stringification')
+  test3.step(function() {
+    var client = new XMLHttpRequest()
+    var objSendsOnStringification = {toString:function(){
+      client.send('bomb!');
+    }}
+    client.onload = test3.step_func(function(){
+      assert_equals(client.responseText, 'bomb!')
+      test3.done()
+    })
+    client.open('POST', 'resources/content.py')
+    assert_throws_dom('InvalidStateError', function(){
+      client.send(objSendsOnStringification)
+    })
+  });
+
+
+</script>
diff --git a/test/wpt/tests/xhr/send-entity-body-basic.htm b/test/wpt/tests/xhr/send-entity-body-basic.htm
new file mode 100644
index 00000000000..526a1fb349e
--- /dev/null
+++ b/test/wpt/tests/xhr/send-entity-body-basic.htm
@@ -0,0 +1,28 @@
+<!doctype html>
+<html>
+  <head>
+    <title>XMLHttpRequest: send() - data argument</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-send()-method" data-tested-assertations="/following::ol/li[4]" />
+  </head>
+  <body>
+    <div id="log"></div>
+    <script>
+      function request(input, output) {
+        test(function() {
+          var client = new XMLHttpRequest()
+          client.open("POST", "resources/content.py", false)
+          client.send(input)
+          assert_equals(client.responseText, output)
+        }, document.title + " (" + output + ")")
+      }
+      request(1, "1")
+      request(10000000, "10000000")
+      request([2,2], "2,2")
+      request(false, "false")
+      request("A\0A", "A\0A")
+      request(new URLSearchParams([[1, 2], [3, 4]]), "1=2&3=4")
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/send-entity-body-document-bogus.htm b/test/wpt/tests/xhr/send-entity-body-document-bogus.htm
new file mode 100644
index 00000000000..c10e70aa38d
--- /dev/null
+++ b/test/wpt/tests/xhr/send-entity-body-document-bogus.htm
@@ -0,0 +1,26 @@
+<!doctype html>
+<title>XMLHttpRequest: send() - Document with serialization errors</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<div id="log"></div>
+<script>
+function serialize(input, output) {
+  async_test(t => {
+    const client = new XMLHttpRequest
+    client.open("POST", "resources/content.py")
+    client.send(input)
+    client.onload = t.step_func_done(() => {
+      assert_equals(client.responseText, output)
+    })
+  }, "Serializing documents through XMLHttpRequest: '" + output + "'")
+}
+
+var doc = document.implementation.createDocument(null, null, null)
+serialize(doc, "")
+doc.appendChild(doc.createElement("test:test"))
+serialize(doc, "<test:test/>")
+doc.childNodes[0].setAttribute("test:test", "gee")
+serialize(doc, "<test:test test:test=\"gee\"/>")
+doc.childNodes[0].setAttribute("x", "\uD800")
+serialize(doc, "<test:test test:test=\"gee\" x=\"\uFFFD\"/>")
+</script>
diff --git a/test/wpt/tests/xhr/send-entity-body-document.htm b/test/wpt/tests/xhr/send-entity-body-document.htm
new file mode 100644
index 00000000000..e3a1070826b
--- /dev/null
+++ b/test/wpt/tests/xhr/send-entity-body-document.htm
@@ -0,0 +1,92 @@
+<!doctype html>
+<html>
+  <head>
+    <title>XMLHttpRequest: send() - Document</title>
+    <meta charset="utf-8">
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-send()-method" data-tested-assertations="/following::ol/li[4]" />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#dom-XMLHttpRequest-send-document" data-tested-assertations="/following::dd" />
+  </head>
+  <body>
+    <div id="log"></div>
+    <script>
+    var tests = [
+      {
+        title: 'XML document, windows-1252',
+        url: 'resources/win-1252-xml.py',
+        contentType: 'application/xml;charset=UTF-8',
+        responseText: '<\u00FF\/>'
+      },
+      // Invalid character code in document turns into U+FFFD.
+      {
+        title: 'HTML document, invalid UTF-8',
+        url: 'resources/invalid-utf8-html.py',
+        contentType: 'text/html;charset=UTF-8',
+        responseText: '<body>\uFFFD<\/body>'
+      },
+      // Correctly serialized Shift-JIS.
+      {
+        title: 'HTML document, shift-jis',
+        url: 'resources/shift-jis-html.py',
+        contentType: 'text/html;charset=UTF-8',
+        responseText: '<body>\u30C6\u30b9\u30c8<\/body>'
+      },
+      // There's some markup included, but it's not really relevant for this
+      // test suite, so we do an indexOf() test.
+      {
+        title: 'plain text file',
+        url: 'folder.txt',
+        contentType: 'text/html;charset=UTF-8',
+        responseText: 'top'
+      },
+      // This test does not want to assert anything about what markup a
+      // standalone image should be wrapped in. Hence this test lacks a
+      // responseText expectation.
+      {
+        title: 'image file',
+        url: 'resources/image.gif',
+        contentType: 'text/html;charset=UTF-8'
+      },
+      {
+        title: 'img tag',
+        url: 'resources/img-utf8-html.py',
+        contentType: 'text/html;charset=UTF-8',
+        responseText: '<img>foo'
+      },
+      {
+        title: 'empty div',
+        url: 'resources/empty-div-utf8-html.py',
+        contentType: 'text/html;charset=UTF-8',
+        responseText: '<!DOCTYPE html><html><head></head><body><div></div></body></html>'
+      }
+    ];
+
+    tests.forEach(function(t) {
+      async_test(function() {
+        var iframe = document.createElement("iframe");
+        iframe.onload = this.step_func_done(function() {
+          var client = new XMLHttpRequest()
+          client.open("POST", "resources/content.py?response_charset_label=UTF-8", false)
+          client.send(iframe.contentDocument)
+          assert_equals(client.getResponseHeader('X-Request-Content-Type'),
+                        t.contentType,
+                        'document should be serialized and sent as ' + t.contentType)
+          // The indexOf() assertion will overlook some stuff, e.g. XML
+          // prologues that shouldn't be there (looking at you, Presto).
+          // However, arguably these things have little to do with the XHR
+          // functionality we're testing.
+          if (t.responseText) {
+            assert_true(client.responseText.indexOf(t.responseText) != -1,
+                        JSON.stringify(t.responseText) + " not in " +
+                        JSON.stringify(client.responseText));
+          }
+          assert_equals(client.responseXML, null)
+        });
+        iframe.src = t.url;
+        document.body.appendChild(iframe);
+      }, t.title);
+    });
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/send-entity-body-empty.htm b/test/wpt/tests/xhr/send-entity-body-empty.htm
new file mode 100644
index 00000000000..f307e778091
--- /dev/null
+++ b/test/wpt/tests/xhr/send-entity-body-empty.htm
@@ -0,0 +1,26 @@
+<!doctype html>
+<html>
+  <head>
+    <title>XMLHttpRequest: send("") - empty entity body</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-send()-method" data-tested-assertations="following::ol[1]/li[7]" />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#dom-XMLHttpRequest-send-a-string" data-tested-assertations="following::p[1] following::p[2] following::p[3]" />
+  </head>
+  <body>
+    <div id="log"></div>
+    <script>
+      function request(method) {
+        var client = new XMLHttpRequest()
+        client.open(method, "resources/content.py", false)
+        client.upload.onloadstart = function(){assert_unreached('this event should not fire for empty strings')}
+        client.send("")
+        var expectedLength = method == "HEAD" ? "NO" : "0";
+        assert_equals(client.getResponseHeader("x-request-content-length"), expectedLength)
+      }
+      test(function() { request("POST"); }, document.title + " (POST)");
+      test(function() { request("PUT"); }, document.title + " (PUT)");
+      test(function() { request("HEAD"); }, document.title + " (HEAD)");
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/send-entity-body-get-head-async.htm b/test/wpt/tests/xhr/send-entity-body-get-head-async.htm
new file mode 100644
index 00000000000..4a7deec034a
--- /dev/null
+++ b/test/wpt/tests/xhr/send-entity-body-get-head-async.htm
@@ -0,0 +1,39 @@
+<!doctype html>
+<html>
+  <head>
+    <title>XMLHttpRequest: send() - non-empty data argument and GET/HEAD - async, no upload events should fire</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+        <link rel="help" href="https://xhr.spec.whatwg.org/#the-send()-method" data-tested-assertations="following::OL[1]/LI[3] following::OL[1]/LI[7] following::OL[1]/LI[8]" />
+
+  </head>
+  <body>
+    <div id="log"></div>
+    <script>
+      function request(method) {
+        var test = async_test( document.title + " (" + method + ")")
+        var events=[]
+        var logEvt = function (e) {
+          events.push(e.type)
+        }
+        var client = new XMLHttpRequest()
+        client.open(method, "resources/content.py")
+        client.upload.addEventListener('progress', logEvt)
+        client.upload.addEventListener('loadend', logEvt)
+        client.upload.addEventListener('loadstart', logEvt)
+        client.addEventListener('loadend', function(){
+          test.step(function(){
+            assert_equals(client.getResponseHeader("x-request-content-length"), "NO")
+            assert_equals(client.getResponseHeader("x-request-method"), method)
+            assert_equals(client.responseText, "")
+            assert_array_equals(events, [])
+            test.done()
+          })
+        })
+        client.send("TEST")
+      }
+      request("GET")
+      request("HEAD")
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/send-entity-body-get-head.htm b/test/wpt/tests/xhr/send-entity-body-get-head.htm
new file mode 100644
index 00000000000..95ff711b858
--- /dev/null
+++ b/test/wpt/tests/xhr/send-entity-body-get-head.htm
@@ -0,0 +1,36 @@
+<!doctype html>
+<html>
+  <head>
+    <title>XMLHttpRequest: send() - non-empty data argument and GET/HEAD</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+        <link rel="help" href="https://xhr.spec.whatwg.org/#the-send()-method" data-tested-assertations="following::OL[1]/LI[3] following::OL[1]/LI[7]" />
+
+  </head>
+  <body>
+    <div id="log"></div>
+    <script>
+      function request(method) {
+        test(function() {
+          var events=[]
+          var logEvt = function (e) {
+            events.push(e.type)
+          }
+          var client = new XMLHttpRequest()
+          client.open(method, "resources/content.py", false)
+          client.send("TEST")
+          client.upload.addEventListener('progress', logEvt)
+          client.upload.addEventListener('loadend', logEvt)
+          client.upload.addEventListener('loadstart', logEvt)
+
+          assert_equals(client.getResponseHeader("x-request-content-length"), "NO")
+          assert_equals(client.getResponseHeader("x-request-method"), method)
+          assert_equals(client.responseText, "")
+          assert_array_equals(events, [])
+        }, document.title + " (" + method + ")")
+      }
+      request("GET")
+      request("HEAD")
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/send-entity-body-none.htm b/test/wpt/tests/xhr/send-entity-body-none.htm
new file mode 100644
index 00000000000..d757cb30a9f
--- /dev/null
+++ b/test/wpt/tests/xhr/send-entity-body-none.htm
@@ -0,0 +1,40 @@
+<!doctype html>
+<html>
+  <head>
+    <title>XMLHttpRequest: send(null) - no entity body</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-send()-method" data-tested-assertations="following::ol[1]/li[4] following::ol[1]/li[7]" />
+  </head>
+  <body>
+    <div id="log"></div>
+    <script>
+      function noContentTypeTest(method) {
+        var client = new XMLHttpRequest()
+        client.open(method, "resources/content.py", false)
+        client.upload.onloadstart = function(){assert_unreached('this event should not fire for null')}
+        client.send(null)
+        var expectedLength = method == "HEAD" ? "NO" : "0";
+        assert_equals(client.getResponseHeader("x-request-content-length"), expectedLength)
+        assert_equals(client.getResponseHeader("x-request-content-type"), "NO")
+      }
+      test(function() { noContentTypeTest("POST"); }, "No content type (POST)");
+      test(function() { noContentTypeTest("PUT"); }, "No content type (PUT)");
+      test(function() { noContentTypeTest("HEAD"); }, "No content type (HEAD)");
+
+      function explicitContentTypeTest(method) {
+        var client = new XMLHttpRequest()
+        client.open(method, "resources/content.py", false)
+        var content_type = 'application/x-foo'
+        client.setRequestHeader('Content-Type', content_type)
+        client.send(null)
+        var expectedLength = method == "HEAD" ? "NO" : "0";
+        assert_equals(client.getResponseHeader("x-request-content-length"), expectedLength)
+        assert_equals(client.getResponseHeader("x-request-content-type"), content_type)
+      }
+      test(function() { explicitContentTypeTest("POST"); }, "Explicit content type (POST)");
+      test(function() { explicitContentTypeTest("PUT"); }, "Explicit content type (PUT)");
+      test(function() { explicitContentTypeTest("HEAD"); }, "Explicit content type (HEAD)");
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/send-network-error-async-events.sub.htm b/test/wpt/tests/xhr/send-network-error-async-events.sub.htm
new file mode 100644
index 00000000000..c51a05cd201
--- /dev/null
+++ b/test/wpt/tests/xhr/send-network-error-async-events.sub.htm
@@ -0,0 +1,47 @@
+<!DOCTYPE html>
+<html>
+<head>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#handler-xhr-onerror" data-tested-assertations="../.." />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-send()-method" data-tested-assertations="following::ol[1]/li[9]/ol/li[2] following::ol[1]/li[9]/ol/li[3]" />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#infrastructure-for-the-send()-method" data-tested-assertations="following::dt[4] following::dd[4]/p" />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#network-error" data-tested-assertations=".." />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#request-error" data-tested-assertations="following::ol[1]/li[4] following::ol[1]/li[6] following::ol[1]/li[7] following::ol[1]/li[7]/ol/li[3] following::ol[1]/li[7]/ol/li[4] following::ol[1]/li[9] following::ol[1]/li[10]" />
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <title>XMLHttpRequest: The send() method: Fire a progress event named error when Network error happens (synchronous flag is unset)</title>
+</head>
+
+<body>
+    <div id="log"></div>
+
+    <script type="text/javascript">
+        var test = async_test();
+
+        test.step(function(){
+            var xhr = new XMLHttpRequest();
+            var expect =  ["loadstart", "upload.loadstart", 4, "upload.error", "upload.loadend", "error", "loadend"];
+            var actual = [];
+
+            xhr.onreadystatechange = test.step_func(() => {
+                if (xhr.readyState == 4) {
+                    actual.push(xhr.readyState);
+                }
+            });
+
+            xhr.onloadstart        = test.step_func(e => { actual.push(e.type); })
+            xhr.onloadend          = test.step_func_done(e => {
+                actual.push(e.type);
+                assert_array_equals(actual, expect);
+            })
+            xhr.onerror            = test.step_func(e => { actual.push(e.type); })
+
+            xhr.upload.onloadstart = test.step_func(e => { actual.push("upload." + e.type); })
+            xhr.upload.onloadend   = test.step_func(e => { actual.push("upload." + e.type); })
+            xhr.upload.onerror     = test.step_func(e => { actual.push("upload." + e.type); })
+
+            xhr.open("POST", "http://nonexistent.{{host}}:{{ports[http][0]}}", true);
+            xhr.send("Test Message");
+        });
+    </script>
+</body>
+</html>
diff --git a/test/wpt/tests/xhr/send-network-error-sync-events.sub.htm b/test/wpt/tests/xhr/send-network-error-sync-events.sub.htm
new file mode 100644
index 00000000000..2266eb36e1e
--- /dev/null
+++ b/test/wpt/tests/xhr/send-network-error-sync-events.sub.htm
@@ -0,0 +1,45 @@
+<!DOCTYPE html>
+<html>
+<head>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#infrastructure-for-the-send()-method" data-tested-assertations="following::dt[4] following::dd[4]/p" />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#network-error" data-tested-assertations=".." />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#request-error" data-tested-assertations="following::ol[1]/li[4] following::ol[1]/li[5]" />
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <title>XMLHttpRequest: The send() method: Throw a "throw an "NetworkError" exception when Network error happens (synchronous flag is set)</title>
+</head>
+
+<body>
+    <div id="log"></div>
+
+    <script type="text/javascript">
+        test(function()
+        {
+            var xhr = new XMLHttpRequest();
+
+            xhr.open("POST", "http://nonexistent.{{host}}:{{ports[http][0]}}", false);
+
+            assert_throws_dom("NetworkError", function()
+            {
+                xhr.send("Test Message");
+            });
+            assert_equals(xhr.readyState, 4)
+
+        }, "http URL");
+
+        test(function()
+        {
+            var xhr = new XMLHttpRequest();
+
+            xhr.open("GET", "data:text/html;charset=utf-8;base64,PT0NUWVBFIGh0bWw%2BDQo8", false);
+
+            assert_throws_dom("NetworkError", function()
+            {
+                xhr.send("Test Message");
+            });
+            assert_equals(xhr.readyState, 4)
+
+        }, "data URL");
+    </script>
+</body>
+</html>
diff --git a/test/wpt/tests/xhr/send-no-response-event-loadend.htm b/test/wpt/tests/xhr/send-no-response-event-loadend.htm
new file mode 100644
index 00000000000..0a1eda53734
--- /dev/null
+++ b/test/wpt/tests/xhr/send-no-response-event-loadend.htm
@@ -0,0 +1,48 @@
+<!DOCTYPE html>
+<html>
+<head>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <title>XMLHttpRequest: The send() method: Fire a progress event named loadend (no response entity body)</title>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#handler-xhr-onloadend" data-tested-assertations="/../.." />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#event-xhr-loadend" data-tested-assertations="/../.." />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#infrastructure-for-the-send()-method" data-tested-assertations="following::dt[10] /following-sibling::ol/li[10]" />
+</head>
+
+<body>
+    <div id="log"></div>
+
+    <script type="text/javascript">
+        var test = async_test();
+
+        test.step(function ()
+        {
+            var xhr = new XMLHttpRequest();
+
+            xhr.onreadystatechange = function()
+            {
+                test.step(function()
+                {
+                    if (xhr.readyState == 4)
+                    {
+                        assert_equals(xhr.response, "");
+                    }
+                });
+            };
+
+            xhr.onloadend = function(e)
+            {
+                test.step(function()
+                {
+                    assert_true(e instanceof ProgressEvent);
+                    assert_equals(e.type, "loadend");
+                    test.step(function() { test.done(); });
+                });
+            };
+
+            xhr.open("POST", "./resources/content.py", true);
+            xhr.send();
+        });
+    </script>
+</body>
+</html>
diff --git a/test/wpt/tests/xhr/send-no-response-event-loadstart.htm b/test/wpt/tests/xhr/send-no-response-event-loadstart.htm
new file mode 100644
index 00000000000..cd4a0683ed0
--- /dev/null
+++ b/test/wpt/tests/xhr/send-no-response-event-loadstart.htm
@@ -0,0 +1,48 @@
+<!DOCTYPE html>
+<html>
+<head>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#handler-xhr-onloadstart" data-tested-assertations="/../.." />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#event-xhr-loadstart" data-tested-assertations="/../.." />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-send()-method" data-tested-assertations="/following-sibling::ol/li[9]/ol/li[2]" />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-response-attribute" data-tested-assertations="/following-sibling::ol/li[1]" />
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <title>XMLHttpRequest: The send() method: Fire a progress event named loadstart (no response entity body and the state is LOADING)</title>
+</head>
+
+<body>
+    <div id="log"></div>
+
+    <script type="text/javascript">
+        var test = async_test();
+
+        test.step(function()
+        {
+            var xhr = new XMLHttpRequest();
+
+            xhr.onreadystatechange = function()
+            {
+                test.step(function()
+                {
+                    if (xhr.readyState == 3)
+                    {
+                        assert_equals(xhr.response, "");
+                    }
+                    else if (xhr.readyState == 4)
+                    {
+                        assert_unreached("loadstart event did not fire in LOADING state!");
+                    }
+                });
+            };
+
+            xhr.onloadstart = function()
+            {
+                test.step(function() { test.done("Test done!"); });
+            };
+
+            xhr.open("POST", "./resources/content.py", true);
+            xhr.send();
+        });
+    </script>
+</body>
+</html>
diff --git a/test/wpt/tests/xhr/send-no-response-event-order.htm b/test/wpt/tests/xhr/send-no-response-event-order.htm
new file mode 100644
index 00000000000..44c1d779786
--- /dev/null
+++ b/test/wpt/tests/xhr/send-no-response-event-order.htm
@@ -0,0 +1,45 @@
+<!DOCTYPE html>
+<html>
+<head>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#handler-xhr-onloadstart" data-tested-assertations="../.." />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#handler-xhr-onloadend" data-tested-assertations="../.." />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#event-xhr-loadstart" data-tested-assertations="../.." />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#event-xhr-loadend" data-tested-assertations="../.." />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-send()-method" data-tested-assertations="following-sibling::ol/li[9]/ol/li[2]" />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#infrastructure-for-the-send()-method" data-tested-assertations="following::dt[10] following::a[contains(@href,'#switch-done')]/.." />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#switch-done" data-tested-assertations="following::ol[1]/li[3] following::ol[1]/li[4] following::ol[1]/li[6] following::ol[1]/li[7]" />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-response-attribute" data-tested-assertations="following-sibling::ol/li[1]" />
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <script src="resources/xmlhttprequest-event-order.js"></script>
+    <title>XMLHttpRequest: The send() method: event order when there is no response entity body</title>
+</head>
+
+<body>
+    <div id="log"></div>
+
+    <script type="text/javascript">
+        var test = async_test();
+
+        test.step(function()
+        {
+            var xhr = new XMLHttpRequest();
+            prepare_xhr_for_event_order_test(xhr);
+
+            xhr.addEventListener("readystatechange", test.step_func(function() {
+                if (xhr.readyState == 3) {
+                    assert_equals(xhr.response, "");
+                }
+            }));
+
+            xhr.addEventListener("loadend", test.step_func(function(e) {
+                assert_xhr_event_order_matches([1, "loadstart(0,0,false)", 2, "progress(0,0,false)", 4,"load(0,0,false)", "loadend(0,0,false)"]);
+                test.done();
+            }));
+
+            xhr.open("POST", "./resources/content.py", true);
+            xhr.send();
+        });
+    </script>
+</body>
+</html>
diff --git a/test/wpt/tests/xhr/send-non-same-origin.htm b/test/wpt/tests/xhr/send-non-same-origin.htm
new file mode 100644
index 00000000000..bb9f32c174f
--- /dev/null
+++ b/test/wpt/tests/xhr/send-non-same-origin.htm
@@ -0,0 +1,33 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>XMLHttpRequest: send() - non same-origin</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <base>
+  </head>
+  <body>
+    <div id="log"></div>
+    <script src="/common/get-host-info.sub.js"></script>
+    <script>
+      // Setting base URL before running the tests
+      var host_info = get_host_info();
+      document.getElementsByTagName("base")[0].setAttribute("href", host_info.HTTP_REMOTE_ORIGIN);
+
+      function url(url) {
+        test(function() {
+          var client = new XMLHttpRequest()
+          client.open("GET", url, false)
+          assert_throws_dom("NetworkError", function() { client.send() })
+        }, document.title + " (" + url + ")")
+      }
+      url("mailto:test@example.org")
+      url("tel:+31600000000")
+      url(host_info.HTTP_REMOTE_ORIGIN)
+      url("javascript:alert('FAIL')")
+      url("folder.txt")
+      url("about:blank")
+      url("blob:bogusidentifier")
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/send-receive-utf16.htm b/test/wpt/tests/xhr/send-receive-utf16.htm
new file mode 100644
index 00000000000..6d6fb90a173
--- /dev/null
+++ b/test/wpt/tests/xhr/send-receive-utf16.htm
@@ -0,0 +1,37 @@
+<!doctype html>
+<meta charset=utf-8>
+<title>XMLHttpRequest: The send() method: receive data which is UTF-16 encoded</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#text-response" data-tested-assertations="following::ol/li[9]" />
+<div id="log"></div>
+
+<script>
+  async_test(function() {
+    var client = new XMLHttpRequest();
+    client.onload = this.step_func_done(function(e) {
+      assert_equals(client.responseText, 'æøå\nテスト\n')
+    });
+    client.open("GET", "resources/utf16.txt");
+    client.send(null);
+  }, 'UTF-16 with BOM, no encoding in content-type');
+
+  async_test(function() {
+    var client = new XMLHttpRequest();
+    client.onload = this.step_func_done(function(e) {
+      assert_equals(client.responseText, 'æøå\nテスト\n')
+    });
+    client.open("GET", "resources/status.py?code=200&type=text%2Fplain%3Bcharset%3DUTF-16&content=%E6%00%F8%00%E5%00%0A%00%C6%30%B9%30%C8%30%0A%00");
+    client.send(null);
+  }, 'UTF-16 without BOM, with charset label in content-type');
+
+  async_test(function() {
+    var client = new XMLHttpRequest();
+    client.onload = this.step_func_done(function(e) {
+      // plenty of EF BF BD Replacement Character in this invalid input..
+      assert_equals(client.responseText, "\ufffd\u0000\ufffd\u0000\ufffd\u0000\u000a\u0000\ufffd\u0030\ufffd\u0030\ufffd\u0030\u000a\u0000")
+    });
+    client.open("GET", "resources/status.py?code=200&type=text%2Fplain%3Bcharset%3DUTF-8&content=%E6%00%F8%00%E5%00%0A%00%C6%30%B9%30%C8%30%0A%00");
+    client.send(null);
+  }, 'UTF-16 without BOM, mislabelled as UTF-8 in content-type');
+</script>
diff --git a/test/wpt/tests/xhr/send-redirect-bogus-sync.htm b/test/wpt/tests/xhr/send-redirect-bogus-sync.htm
new file mode 100644
index 00000000000..0f0598b1645
--- /dev/null
+++ b/test/wpt/tests/xhr/send-redirect-bogus-sync.htm
@@ -0,0 +1,26 @@
+<!doctype html>
+<html>
+  <head>
+    <title>XMLHttpRequest: send() - Redirects (bogus Location header; sync)</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#infrastructure-for-the-send()-method" data-tested-assertations="following::dl[1]/dt[2] following::dl[1]/dd[2]/ol/li[1] following::dl[1]/dd[2]/ol/li[3]" />
+  </head>
+  <body>
+    <div id="log"></div>
+    <script>
+      function redirect(code, location) {
+        test(function() {
+          var client = new XMLHttpRequest()
+          client.open("GET", "resources/redirect.py?location=" + location + "&code=" + code, false)
+          assert_throws_dom("NetworkError", function() { client.send(null) })
+        }, document.title + " (" + code + ": " + location + ")")
+      }
+      redirect("301", "foobar://abcd")
+      redirect("302", "http://z.")
+      redirect("302", "mailto:someone@example.org")
+      redirect("303", "http://z.")
+      redirect("303", "tel:1234567890")
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/send-redirect-bogus.htm b/test/wpt/tests/xhr/send-redirect-bogus.htm
new file mode 100644
index 00000000000..ad50b56f4a0
--- /dev/null
+++ b/test/wpt/tests/xhr/send-redirect-bogus.htm
@@ -0,0 +1,36 @@
+<!doctype html>
+<html>
+  <head>
+    <title>XMLHttpRequest: send() - Redirects (bogus Location header)</title>
+    <meta name=timeout content=long>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#infrastructure-for-the-send()-method" data-tested-assertations="following::dl[1]/dt[2] following::dl[1]/dd[2]/ol/li[1] following::dl[1]/dd[2]/ol/li[3]" />
+  </head>
+  <body>
+    <div id="log"></div>
+    <script>
+      function redirect(code, location) {
+        var test = async_test(document.title + " (" + code + ": " + location + ")");
+        test.step(function() {
+          var client = new XMLHttpRequest()
+          client.onreadystatechange = function() {
+            test.step(function() {
+              if(client.readyState == 4) {
+                assert_equals(client.status, 0)
+                assert_equals(client.statusText, "")
+                test.done()
+              }
+            })
+          }
+          client.open("GET", "resources/redirect.py?location=" + location + "&code=" + code)
+          client.send(null)
+        })
+      }
+      redirect("302", "http://example.not")
+      redirect("302", "mailto:someone@example.org")
+      redirect("303", "http://example.not")
+      redirect("303", "foobar:someone@example.org")
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/send-redirect-infinite-sync.htm b/test/wpt/tests/xhr/send-redirect-infinite-sync.htm
new file mode 100644
index 00000000000..cc6d7a24bf6
--- /dev/null
+++ b/test/wpt/tests/xhr/send-redirect-infinite-sync.htm
@@ -0,0 +1,24 @@
+<!doctype html>
+<html>
+  <head>
+    <title>XMLHttpRequest: send() - Redirects (infinite loop; sync)</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#infrastructure-for-the-send()-method" data-tested-assertations="following::dl[1]/dt[2] following::dl[1]/dd[2]/p[1]" />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#network-error" data-tested-assertations=".." />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#request-error" data-tested-assertations="following::ol[1]/li[5]" />
+  </head>
+  <body>
+    <div id="log"></div>
+    <script>
+      function redirect(code) {
+        test(function() {
+          var client = new XMLHttpRequest()
+          client.open("GET", "resources/infinite-redirects.py?type="+code, false)
+          assert_throws_dom("NetworkError", function() { client.send(null) })
+        }, document.title + " (" + code + ")")
+      }
+      redirect("301")
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/send-redirect-infinite.htm b/test/wpt/tests/xhr/send-redirect-infinite.htm
new file mode 100644
index 00000000000..54e2ea89485
--- /dev/null
+++ b/test/wpt/tests/xhr/send-redirect-infinite.htm
@@ -0,0 +1,35 @@
+<!doctype html>
+<html>
+  <head>
+    <title>XMLHttpRequest: send() - Redirects (infinite loop)</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#handler-xhr-onerror" data-tested-assertations="../.." />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#infrastructure-for-the-send()-method" data-tested-assertations="following::dl[1]/dt[2] following::dl[1]/dd[2]/p[1]" />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#network-error" data-tested-assertations=".." />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#request-error" data-tested-assertations="following::ol[1]/li[4] following::ol[1]/li[9] following::ol[1]/li[10]" />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-responsetext-attribute" data-tested-assertations="following::ol[1]/li[3]" />
+  </head>
+  <body>
+    <div id="log"></div>
+    <script>
+      var test = async_test()
+      var client = new XMLHttpRequest(),
+        errorEventFired = false,
+        code = 301
+      client.open("GET", "resources/infinite-redirects.py?type="+code)
+      client.onerror = function(){
+        errorEventFired = true
+      }
+      client.onloadend = function(){
+        test.step(function() {
+          assert_equals(errorEventFired, true)
+          assert_equals(client.responseText, '')
+          assert_equals(client.readyState, 4)
+          test.done()
+        })
+      }
+      client.send(null)
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/send-redirect-no-location.htm b/test/wpt/tests/xhr/send-redirect-no-location.htm
new file mode 100644
index 00000000000..3a80348fd73
--- /dev/null
+++ b/test/wpt/tests/xhr/send-redirect-no-location.htm
@@ -0,0 +1,40 @@
+<!doctype html>
+<html>
+  <head>
+    <title>XMLHttpRequest: send() - Redirects (no Location header)</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#infrastructure-for-the-send()-method" data-tested-assertations="following::dl[1]/dt[2]" />
+    <!--
+      NOTE: the XHR spec does not really handle this scenario. It's handled in the Fetch spec:
+      "If response's headers do not contain a header whose name is Location, return response."
+     -->
+  </head>
+  <body>
+    <div id="log"></div>
+    <script>
+      function redirect(code) {
+        var test = async_test(document.title + " (" + code + ")")
+        test.step(function() {
+          var client = new XMLHttpRequest()
+          client.onreadystatechange = function() {
+            test.step(function() {
+              if(client.readyState == 4) {
+                assert_equals(client.status + "", code)
+                assert_equals(client.statusText, "ABE ODDYSSEE")
+                assert_equals(client.responseXML.documentElement.localName, "x")
+                test.done()
+              }
+            })
+          }
+          client.open("GET", "resources/status.py?content=<x>x<\/x>&type=text/xml&text=ABE ODDYSSEE&code=" + code)
+          client.send(null)
+        })
+      }
+      redirect("301")
+      redirect("302")
+      redirect("303")
+      redirect("307")
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/send-redirect-post-upload.htm b/test/wpt/tests/xhr/send-redirect-post-upload.htm
new file mode 100644
index 00000000000..b1db8ec2ac9
--- /dev/null
+++ b/test/wpt/tests/xhr/send-redirect-post-upload.htm
@@ -0,0 +1,140 @@
+<!DOCTYPE html>
+<html>
+<head>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#handler-xhr-onprogress" data-tested-assertations="../.." />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#event-xhr-progress" data-tested-assertations="../.." />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-send()-method" data-tested-assertations="following::dt[@id="dom-xmlhttprequest-send-bodyinit"]/following::dd[1]/p[2] following::ol[1]/li[9]//li[1] following::ol[1]/li[9]//li[2]" />
+    <link rel="help" href="https://fetch.spec.whatwg.org/#http-fetch" data-tested-assertations="following::ol[1]/li[6]/dl/dd[1]//dd[3]" />
+    <link rel="help" href="https://fetch.spec.whatwg.org/#concept-http-redirect-fetch" data-tested-assertations="following::li[16]" />
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <title>XMLHttpRequest: The send() method: POSTing to URL that redirects</title>
+</head>
+
+<body>
+    <div id="log"></div>
+
+    <script type="text/javascript">
+    function testRedirectPost(params) {
+        var test = async_test(document.title + " (" + params.name + ")");
+        var actual = [];
+        // We check upload.onprogress with a boolean because it *might* fire more than once
+        var progressFiredReadyState1 = false;
+
+        var expectedHeaders, expectedEvents;
+
+        // 307 redirects should resend the POST data, and events and headers will be a little different..
+        if(params.expectResendPost) {
+            expectedHeaders = {
+                "X-Request-Content-Length": "12000",
+                "X-Request-Content-Type": "text/plain;charset=UTF-8",
+                "X-Request-Method": "POST",
+                "X-Request-Query": "NO",
+                "Content-Length": "12000"
+            }
+            expectedEvents = [
+                "xhr onreadystatechange 1",
+                "xhr loadstart 1",
+                "upload loadstart 1",
+                "upload loadend 1",
+                "xhr onreadystatechange 2",
+                "xhr onreadystatechange 3",
+                "xhr onreadystatechange 4",
+                "xhr load 4",
+                "xhr loadend 4"
+            ];
+        } else {
+            // setting the right expectations for POST resent as GET without request body
+            expectedHeaders = {
+                "X-Request-Content-Length": "NO",
+                "X-Request-Content-Type": "NO",
+                "X-Request-Method": "GET",
+                "X-Request-Query": "NO"
+            }
+            expectedEvents = [
+                "xhr onreadystatechange 1",
+                "xhr loadstart 1",
+                "upload loadstart 1",
+                "upload loadend 1",
+                "xhr onreadystatechange 2",
+                /* we expect no onreadystatechange readyState=3 event because there is no loading content */
+                "xhr onreadystatechange 4",
+                "xhr load 4",
+                "xhr loadend 4"
+            ];
+        }
+        // Override expectations if provided.
+        if(params.expectedContentType)
+          expectedHeaders["X-Request-Content-Type"] = params.expectedContentType;
+
+        test.step(function()
+        {
+            var xhr = new XMLHttpRequest();
+
+            xhr.upload.onloadstart = test.step_func(function(e) {
+                actual.push("upload loadstart " + xhr.readyState);
+            });
+            xhr.upload.onprogress = test.step_func(function(e) {
+                // events every 50ms, one final when uploading is done
+                if(xhr.readyState >= xhr.HEADERS_RECEIVED) {
+                    assert_equals(xhr.status, 200, "JS never gets to see the 30x status code");
+                }
+                progressFiredReadyState1 = xhr.readyState === xhr.OPENED;
+            });
+            xhr.upload.onloadend = test.step_func(function() {
+                actual.push("upload loadend " + xhr.readyState);
+            });
+            xhr.onloadstart = test.step_func(function() {
+                actual.push("xhr loadstart " + xhr.readyState);
+            });
+            xhr.onreadystatechange = test.step_func(function() {
+                if(xhr.readyState >= xhr.HEADERS_RECEIVED) {
+                    assert_equals(xhr.status, 200, "JS never gets to see the 30x status code");
+                }
+
+                // The UA may fire multiple "readystatechange" events while in
+                // the "loading" state.
+                // https://xhr.spec.whatwg.org/#the-send()-method
+                if (xhr.readyState === 3 && actual[actual.length - 1] === "xhr onreadystatechange 3") {
+                    return;
+                }
+
+                actual.push("xhr onreadystatechange " + xhr.readyState);
+            });
+            xhr.onload = test.step_func(function(e)
+            {
+                actual.push("xhr load " + xhr.readyState);
+            });
+            xhr.onloadend = test.step_func(function(e)
+            {
+                actual.push("xhr loadend " + xhr.readyState);
+
+                assert_true(progressFiredReadyState1, "One progress event should fire on xhr.upload when readyState is 1");
+
+                // Headers will tell us if data was sent when expected
+                for(var header in expectedHeaders) {
+                    assert_equals(xhr.getResponseHeader(header), expectedHeaders[header], header);
+                }
+
+                assert_array_equals(actual, expectedEvents, "events firing in expected order and states");
+                if (params.expectedBody)
+                  assert_equals(xhr.response, params.expectedBody, 'request body was resent');
+                test.done();
+            });
+
+            xhr.open("POST", "./resources/redirect.py?location=content.py&code=" + params.code, true);
+            xhr.send(params.body);
+        });
+    }
+
+    const stringBody = "Test Message".repeat(1000);
+    const blobBody = new Blob(new Array(1000).fill("Test Message"));
+
+    testRedirectPost({name: "301", code: 301, expectResendPost: false, body: stringBody});
+    testRedirectPost({name: "302", code: 302, expectResendPost: false, body: stringBody});
+    testRedirectPost({name: "303", code: 303, expectResendPost: false, body: stringBody});
+    testRedirectPost({name: "307 (string)", code: 307, expectResendPost: true,  body: stringBody, expectedBody: stringBody });
+    testRedirectPost({name: "307 (blob)", code: 307, expectResendPost: true, body: blobBody, expectedBody: stringBody, expectedContentType: "NO" });
+    </script>
+</body>
+</html>
diff --git a/test/wpt/tests/xhr/send-redirect-to-cors.htm b/test/wpt/tests/xhr/send-redirect-to-cors.htm
new file mode 100644
index 00000000000..54d7eb550df
--- /dev/null
+++ b/test/wpt/tests/xhr/send-redirect-to-cors.htm
@@ -0,0 +1,92 @@
+<!doctype html>
+<html>
+  <head>
+    <title>XMLHttpRequest: send() - Redirect to CORS-enabled resource</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+  </head>
+  <body>
+    <div id="log"></div>
+    <script>
+      function extractBody(body) {
+        if (body === null) {
+          return { body: "", type: "NO" };
+        }
+        if (typeof body === "string") {
+          return { body: body, type: "text/plain;charset=UTF-8" };
+        }
+        if (body instanceof Uint8Array) {
+          const arr = Array.prototype.slice.call(body);
+          return { body: String.fromCharCode.apply(null, arr), type: "NO" }
+        }
+        return { body: "EXTRACT NOT IMPLEMENTED", type: "EXTRACT NOT IMPLEMENTED" }
+      }
+
+      function redirect(code, name = code, method = "GET", body = null, explicitType = null, safelistContentType = false) {
+        async_test(t => {
+          let { body: expectedBody, type: expectedType } = extractBody(body);
+          if (explicitType !== null) {
+            expectedType = explicitType;
+          }
+          let expectedMethod = method;
+          if (((code === "301" || code === "302") && method === "POST") || (code === "303" && method !== "GET" && method !== "HEAD")) {
+            expectedMethod = "GET";
+            expectedBody = "";
+            expectedType = "NO";
+          }
+          const client = new XMLHttpRequest();
+          client.onreadystatechange = t.step_func(() => {
+            if (client.readyState === 4) {
+              if ((expectedMethod === "GET" && expectedType === "NO") || explicitType !== "application/x-pony" || safelistContentType) {
+                assert_equals(client.status, 200);
+                assert_equals(client.getResponseHeader("x-request-method"), expectedMethod);
+                assert_equals(client.getResponseHeader("x-request-content-type"), expectedType);
+                assert_equals(client.getResponseHeader("x-request-data"), expectedBody);
+              } else {
+                // "application/x-pony" is not safelisted by corsenabled.py -> network error
+                assert_equals(client.status, 0);
+                assert_equals(client.statusText, "");
+                assert_equals(client.responseText, "");
+                assert_equals(client.responseXML, null);
+              }
+              t.done();
+            }
+          });
+          let safelist = "";
+          if (safelistContentType) {
+            safelist = "?safelist_content_type";
+          }
+          client.open(method, "resources/redirect.py?location="+encodeURIComponent("http://www2."+location.host+(location.pathname.replace(/[^\/]+$/, ''))+'resources/corsenabled.py')+safelist+"&code=" + code);
+          if (explicitType !== null) {
+            client.setRequestHeader("Content-Type", explicitType);
+          }
+          client.send(body);
+        }, document.title + " (" + name + ")");
+      }
+      // corsenabled.py safelists methods GET, POST, PUT, and FOO
+      redirect("301")
+      redirect("301", "301 GET with explicit Content-Type", "GET", null, "application/x-pony")
+      redirect("301", "301 GET with explicit Content-Type safelisted", "GET", null, "application/x-pony", true)
+      redirect("303", "303 GET with explicit Content-Type safelisted", "GET", null, "application/x-pony", true)
+      redirect("302")
+      redirect("303")
+      redirect("302", "302 FOO with string and explicit Content-Type safelisted", "FOO", "test", "application/x-pony", true)
+      redirect("303", "303 FOO with string and explicit Content-Type safelisted", "FOO", "test", "application/x-pony", true)
+      redirect("307")
+      redirect("307", "307 post with null", "POST", null)
+      redirect("307", "307 post with string", "POST", "hello")
+      redirect("307", "307 post with typed array", "POST", new Uint8Array([65, 66, 67]))
+      redirect("301", "301 POST with string and explicit Content-Type", "POST", "yoyo", "application/x-pony")
+      redirect("301", "301 POST with string and explicit Content-Type safelisted", "POST", "yoyo", "application/x-pony", true)
+      redirect("302", "302 POST with string and explicit Content-Type", "POST", "yoyo", "application/x-pony")
+      redirect("307", "307 POST with string and explicit Content-Type", "POST", "yoyo", "application/x-pony")
+      redirect("307", "307 FOO with string and explicit Content-Type", "FOO", "yoyo", "application/x-pony")
+      redirect("308", "308 POST with string and explicit Content-Type", "POST", "yoyo", "application/x-pony")
+      redirect("308", "308 FOO with string and explicit Content-Type", "FOO", "yoyo", "application/x-pony")
+      redirect("308", "308 FOO with string and explicit Content-Type text/plain", "FOO", "yoyo", "text/plain")
+      redirect("308", "308 FOO with string and explicit Content-Type multipart/form-data", "FOO", "yoyo", "multipart/form-data")
+      redirect("308", "308 FOO with string and explicit Content-Type safelisted", "FOO", "yoyo", "application/thunderstorm", true)
+      redirect("307", "307 POST with string and explicit Content-Type safelisted", "POST", "yoyo", "application/thunderstorm", true)
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/send-redirect-to-non-cors.htm b/test/wpt/tests/xhr/send-redirect-to-non-cors.htm
new file mode 100644
index 00000000000..c6886a57b59
--- /dev/null
+++ b/test/wpt/tests/xhr/send-redirect-to-non-cors.htm
@@ -0,0 +1,37 @@
+<!doctype html>
+<html>
+  <head>
+    <title>XMLHttpRequest: send() - Redirect to cross-origin resource, not CORS-enabled</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#infrastructure-for-the-send()-method" data-tested-assertations="following::dl[1]/dt[2] following::dl[1]/dd[2]/ol/li[1] following::dl[1]/dd[2]/ol/li[3]" />
+  </head>
+  <body>
+    <div id="log"></div>
+    <script>
+      function redirect(code) {
+        var test = async_test(document.title + " (" + code + ")")
+        test.step(function() {
+          var client = new XMLHttpRequest()
+          client.onreadystatechange = function() {
+            test.step(function() {
+              if(client.readyState == 4) {
+                assert_equals(client.getResponseHeader("x-request-method"), null)
+                assert_equals(client.getResponseHeader("x-request-content-type"), null)
+                assert_equals(client.responseText, '')
+                test.done()
+              }
+            })
+          }
+          client.open("GET", "resources/redirect.py?location="+encodeURIComponent("http://www2."+location.host+(location.pathname.replace(/[^\/]+$/, ''))+'resources/content.py')+"&code=" + code)
+          client.setRequestHeader("Content-Type", "application/x-pony")
+          client.send(null)
+        })
+      }
+      redirect("301")
+      redirect("302")
+      redirect("303")
+      redirect("307")
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/send-redirect.htm b/test/wpt/tests/xhr/send-redirect.htm
new file mode 100644
index 00000000000..16b3231e25b
--- /dev/null
+++ b/test/wpt/tests/xhr/send-redirect.htm
@@ -0,0 +1,36 @@
+<!doctype html>
+<html>
+  <head>
+    <title>XMLHttpRequest: send() - Redirects (basics)</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#infrastructure-for-the-send()-method" data-tested-assertations="following::dl[1]/dt[2] following::dl[1]/dd[2]/ol/li[1] following::dl[1]/dd[2]/ol/li[2]" />
+  </head>
+  <body>
+    <div id="log"></div>
+    <script>
+      function redirect(code) {
+        var test = async_test(document.title + " (" + code + ")")
+        test.step(function() {
+          var client = new XMLHttpRequest()
+          client.onreadystatechange = function() {
+            test.step(function() {
+              if(client.readyState == 4) {
+                assert_equals(client.getResponseHeader("x-request-method"), "GET")
+                assert_equals(client.getResponseHeader("x-request-content-type"), "application/x-pony")
+                test.done()
+              }
+            })
+          }
+          client.open("GET", "resources/redirect.py?location=content.py&code=" + code)
+          client.setRequestHeader("Content-Type", "application/x-pony")
+          client.send(null)
+        })
+      }
+      redirect("301")
+      redirect("302")
+      redirect("303")
+      redirect("307")
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/send-response-event-order.htm b/test/wpt/tests/xhr/send-response-event-order.htm
new file mode 100644
index 00000000000..041cb23c6ea
--- /dev/null
+++ b/test/wpt/tests/xhr/send-response-event-order.htm
@@ -0,0 +1,40 @@
+<!DOCTYPE html>
+<html>
+<head>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#handler-xhr-onloadstart" data-tested-assertations="../.." />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#handler-xhr-onloadend" data-tested-assertations="../.." />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#event-xhr-loadstart" data-tested-assertations="../.." />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#event-xhr-loadend" data-tested-assertations="../.." />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-send()-method" data-tested-assertations="following-sibling::ol/li[9]/ol/li[2] following-sibling::ol/li[9]/ol/li[3] following::a[contains(@href,'#make-upload-progress-notifications')]/.. following::a[contains(@href,'#make-progress-notifications')]/.." />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#make-upload-progress-notifications" data-tested-assertations="following::ul[1]/li[1] following::ul[1]/li[2]/ol[1]/li[2] following::ul[1]/li[2]/ol[1]/li[3] following::ul[1]/li[2]/ol[1]/li[4]" />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#make-progress-notifications" data-tested-assertations=".." />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#infrastructure-for-the-send()-method" data-tested-assertations="following::a[contains(@href,'#switch-done')]/.." />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#switch-done" data-tested-assertations="following::ol[1]/li[3] following::ol[1]/li[4] following::ol[1]/li[5] following::ol[1]/li[6] following::ol[1]/li[7]" />
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <script src="resources/xmlhttprequest-event-order.js"></script>
+    <title>XMLHttpRequest: The send() method: event order when synchronous flag is unset</title>
+</head>
+
+<body>
+    <div id="log"></div>
+
+    <script type="text/javascript">
+        var test = async_test();
+
+        test.step(function()
+        {
+            var xhr = new XMLHttpRequest();
+            prepare_xhr_for_event_order_test(xhr);
+
+            xhr.addEventListener("loadend", test.step_func(function() {
+                assert_xhr_event_order_matches([1, "loadstart(0,0,false)", "upload.loadstart(0,12,true)", "upload.progress(12,12,true)", "upload.load(12,12,true)", "upload.loadend(12,12,true)", 2, 3, "progress(12,12,true)", 4, "load(12,12,true)", "loadend(12,12,true)"]);
+                test.done();
+            }));
+
+            xhr.open("POST", "./resources/content.py", true);
+            xhr.send("Test Message");
+        });
+    </script>
+</body>
+</html>
diff --git a/test/wpt/tests/xhr/send-response-upload-event-loadend.htm b/test/wpt/tests/xhr/send-response-upload-event-loadend.htm
new file mode 100644
index 00000000000..99a239ab135
--- /dev/null
+++ b/test/wpt/tests/xhr/send-response-upload-event-loadend.htm
@@ -0,0 +1,40 @@
+<!DOCTYPE html>
+<html>
+<head>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#handler-xhr-onloadend" data-tested-assertations="../.." />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#event-xhr-loadend" data-tested-assertations="../.." />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-send()-method" data-tested-assertations="following::a[contains(@href,'#make-upload-progress-notifications')]/.. following::ol[1]/li[8]" />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#make-upload-progress-notifications" data-tested-assertations="following::ul[1]/li[2]/ol[1]/li[4]" />
+
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <title>XMLHttpRequest: The send() method: Fire a progress event named loadend on the XMLHttpRequestUpload (synchronous flag is unset)</title>
+</head>
+
+<body>
+    <div id="log"></div>
+
+    <script type="text/javascript">
+        var test = async_test();
+
+        test.step(function()
+        {
+            var xhr = new XMLHttpRequest();
+
+            xhr.upload.onloadend = function(e)
+            {
+                test.step(function()
+                {
+                    assert_true(e instanceof ProgressEvent);
+                    assert_equals(e.type, "loadend");
+                    assert_equals(e.target, xhr.upload);
+                    test.done();
+                });
+            };
+
+            xhr.open("POST", "./resources/content.py", true);
+            xhr.send("Test Message");
+        });
+    </script>
+</body>
+</html>
diff --git a/test/wpt/tests/xhr/send-response-upload-event-loadstart.htm b/test/wpt/tests/xhr/send-response-upload-event-loadstart.htm
new file mode 100644
index 00000000000..7a9be9f8ca4
--- /dev/null
+++ b/test/wpt/tests/xhr/send-response-upload-event-loadstart.htm
@@ -0,0 +1,39 @@
+<!DOCTYPE html>
+<html>
+<head>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#handler-xhr-onloadstart" data-tested-assertations="../.." />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#event-xhr-loadstart" data-tested-assertations="../.." />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-send()-method" data-tested-assertations="following::ol[1]/li[8] following-sibling::ol/li[9]/ol/li[3]" />
+
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <title>XMLHttpRequest: The send() method: Fire a progress event named loadstart on the XMLHttpRequestUpload (synchronous flag is unset)</title>
+</head>
+
+<body>
+    <div id="log"></div>
+
+    <script type="text/javascript">
+        var test = async_test();
+
+        test.step(function()
+        {
+            var xhr = new XMLHttpRequest();
+
+            xhr.upload.onloadstart = function(e)
+            {
+                test.step(function()
+                {
+                    assert_true(e instanceof ProgressEvent);
+                    assert_equals(e.type, "loadstart");
+                    assert_equals(e.target, xhr.upload);
+                    test.done();
+                });
+            };
+
+            xhr.open("POST", "./resources/content.py", true);
+            xhr.send("Test Message");
+        });
+    </script>
+</body>
+</html>
diff --git a/test/wpt/tests/xhr/send-response-upload-event-progress.htm b/test/wpt/tests/xhr/send-response-upload-event-progress.htm
new file mode 100644
index 00000000000..914aed7255a
--- /dev/null
+++ b/test/wpt/tests/xhr/send-response-upload-event-progress.htm
@@ -0,0 +1,39 @@
+<!DOCTYPE html>
+<html>
+<head>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#handler-xhr-onprogress" data-tested-assertations="../.." />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#event-xhr-progress" data-tested-assertations="../.." />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-send()-method" data-tested-assertations="following::a[contains(@href,'#make-upload-progress-notifications')]/.. following::ol[1]/li[8]" />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#make-upload-progress-notifications" data-tested-assertations="following::ul[1]/li[2]/ol[1]/li[2]" />
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <title>XMLHttpRequest: The send() method: Fire a progress event named progress on the XMLHttpRequestUpload (synchronous flag is unset)</title>
+</head>
+
+<body>
+    <div id="log"></div>
+
+    <script type="text/javascript">
+        var test = async_test();
+
+        test.step(function()
+        {
+            var xhr = new XMLHttpRequest();
+
+            xhr.upload.onprogress = function(e)
+            {
+                test.step(function()
+                {
+                    assert_true(e instanceof ProgressEvent);
+                    assert_equals(e.type, "progress");
+                    assert_equals(e.target, xhr.upload);
+                    test.done();
+                });
+            };
+
+            xhr.open("POST", "./resources/content.py", true);
+            xhr.send("Test Message");
+        });
+    </script>
+</body>
+</html>
diff --git a/test/wpt/tests/xhr/send-send.any.js b/test/wpt/tests/xhr/send-send.any.js
new file mode 100644
index 00000000000..64b15541809
--- /dev/null
+++ b/test/wpt/tests/xhr/send-send.any.js
@@ -0,0 +1,7 @@
+test(function() {
+  var client = new XMLHttpRequest()
+  client.open("GET", "resources/well-formed.xml")
+  client.send(null)
+  assert_throws_dom("InvalidStateError", function() { client.send(null) })
+  client.abort()
+}, "XMLHttpRequest: send() - send()");
diff --git a/test/wpt/tests/xhr/send-sync-blocks-async.htm b/test/wpt/tests/xhr/send-sync-blocks-async.htm
new file mode 100644
index 00000000000..74f08a59d60
--- /dev/null
+++ b/test/wpt/tests/xhr/send-sync-blocks-async.htm
@@ -0,0 +1,53 @@
+<!DOCTYPE html>
+<html>
+<head>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <title>XMLHttpRequest: sync requests should block events on pending async requests</title>
+</head>
+
+<body>
+    <div id="log"></div>
+
+    <script type="text/javascript">
+        var test = async_test();
+
+        var expect = ['sync 4', 'async 2', 'async 3', 'async 4']
+        var actual = []
+
+        test.step(function()
+        {
+            var xhr_async = new XMLHttpRequest()
+            xhr_async.open('GET', 'resources/delay.py?ms=1000', true) // first launch an async request, completes in 1 second
+            xhr_async.onreadystatechange = test.step_func(() => {
+                actual.push('async ' + xhr_async.readyState)
+                if(xhr_async.readyState === 4 && actual.indexOf('sync 4')>-1){
+                    VerifyResult()
+                }
+            });
+            xhr_async.send()
+
+            test.step_timeout(() => {
+                var xhr_sync = new XMLHttpRequest();
+                xhr_sync.open('GET', 'resources/delay.py?ms=2000', false) // here's a sync request that will take 2 seconds to finish
+                xhr_sync.onreadystatechange = test.step_func(() => {
+                    actual.push('sync ' + xhr_sync.readyState)
+                    if(xhr_sync.readyState === 4 && actual.indexOf('async 4')>-1){
+                        VerifyResult()
+                    }
+                });
+                xhr_sync.send()
+            }, 10);
+
+            function VerifyResult()
+            {
+                test.step(function()
+                {
+                    assert_array_equals(actual, expect);
+                    test.done();
+                });
+            };
+        });
+    </script>
+</body>
+</html>
diff --git a/test/wpt/tests/xhr/send-sync-no-response-event-load.htm b/test/wpt/tests/xhr/send-sync-no-response-event-load.htm
new file mode 100644
index 00000000000..a2a5516586d
--- /dev/null
+++ b/test/wpt/tests/xhr/send-sync-no-response-event-load.htm
@@ -0,0 +1,38 @@
+<!DOCTYPE html>
+<html>
+<head>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#handler-xhr-onload" data-tested-assertations="../.." />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#event-xhr-load" data-tested-assertations="../.." />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#infrastructure-for-the-send()-method" data-tested-assertations="following::dt[11] following::a[contains(@href,'#switch-done')]/.." />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#switch-done" data-tested-assertations="following::ol/li[1] following::ol/li[6]" />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-response-attribute" data-tested-assertations="/following::ol/li[3]" />
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <title>XMLHttpRequest: The send() method: Fire an event named load (no response entity body and the synchronous flag is set)</title>
+</head>
+
+<body>
+    <div id="log"></div>
+
+    <script type="text/javascript">
+        test(function()
+        {
+            var xhr = new XMLHttpRequest();
+            var pass = false;
+
+            xhr.onload = function(e)
+            {
+                assert_true(e instanceof ProgressEvent);
+                assert_equals(e.type, "load");
+                pass = true;
+            };
+
+            xhr.open("POST", "./resources/content.py", false);
+            xhr.send();
+
+            assert_equals(xhr.response, "");
+            assert_true(pass);
+        });
+    </script>
+</body>
+</html>
diff --git a/test/wpt/tests/xhr/send-sync-no-response-event-loadend.htm b/test/wpt/tests/xhr/send-sync-no-response-event-loadend.htm
new file mode 100644
index 00000000000..7da2a311827
--- /dev/null
+++ b/test/wpt/tests/xhr/send-sync-no-response-event-loadend.htm
@@ -0,0 +1,38 @@
+<!DOCTYPE html>
+<html>
+<head>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#handler-xhr-onloadend" data-tested-assertations="../.." />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#event-xhr-loadend" data-tested-assertations="../.." />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#infrastructure-for-the-send()-method" data-tested-assertations="following::dt[11] following::a[contains(@href,'#switch-done')]/.." />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#switch-done" data-tested-assertations="following::ol/li[1] following::ol/li[7]" />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-response-attribute" data-tested-assertations="/following::ol/li[3]" />
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <title>XMLHttpRequest: The send() method: Fire an event named loadend (no response entity body and the synchronous flag is set)</title>
+</head>
+
+<body>
+    <div id="log"></div>
+
+    <script type="text/javascript">
+        test(function()
+        {
+            var xhr = new XMLHttpRequest();
+            var pass = false;
+
+            xhr.onloadend = function(e)
+            {
+                assert_true(e instanceof ProgressEvent);
+                assert_equals(e.type, "loadend");
+                pass = true;
+            };
+
+            xhr.open("POST", "./resources/content.py", false);
+            xhr.send();
+
+            assert_equals(xhr.response, "");
+            assert_true(pass);
+        });
+    </script>
+</body>
+</html>
diff --git a/test/wpt/tests/xhr/send-sync-no-response-event-order.htm b/test/wpt/tests/xhr/send-sync-no-response-event-order.htm
new file mode 100644
index 00000000000..c7e3172cb00
--- /dev/null
+++ b/test/wpt/tests/xhr/send-sync-no-response-event-order.htm
@@ -0,0 +1,51 @@
+<!DOCTYPE html>
+<html>
+<head>
+    <title>XMLHttpRequest: The send() method: event order when synchronous flag is set and there is no response entity body</title>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#handler-xhr-onloadstart" data-tested-assertations="../.." />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#handler-xhr-onloadend" data-tested-assertations="../.." />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#event-xhr-loadstart" data-tested-assertations="../.." />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#event-xhr-loadend" data-tested-assertations="../.." />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-send()-method" data-tested-assertations="following-sibling::ol[1]/li[9]" />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#same-origin-request-steps" data-tested-assertations="following::DL[1]/DT[1]"/>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#infrastructure-for-the-send()-method" data-tested-assertations="following::dt[11] following::a[contains(@href,'#switch-done')]/.." />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#switch-done" data-tested-assertations="following::ol[1]/li[1] following::ol[1]/li[3] following::ol[1]/li[4] following::ol[1]/li[6] following::ol[1]/li[7]" />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-response-attribute" data-tested-assertations="following::ol/li[3]" />
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+</head>
+
+<body>
+    <div id="log"></div>
+
+    <script type="text/javascript">
+        test(function () {
+            var xhr = new XMLHttpRequest();
+            var expect = [4, "load", "loadend"];
+            var actual = [];
+
+            xhr.onreadystatechange = function()
+            {
+                if (xhr.readyState == 4)
+                {
+                    actual.push(xhr.readyState);
+                }
+            };
+
+            xhr.onloadstart        = function(e){ actual.push(e.type); };
+            xhr.onload             = function(e){ actual.push(e.type); };
+            xhr.onloadend          = function(e){ actual.push(e.type); };
+
+            xhr.upload.onload      = function(e){ actual.push("upload." + e.type); };
+            xhr.upload.onloadstart = function(e){ actual.push("upload." + e.type); };
+            xhr.upload.onloadend   = function(e){ actual.push("upload." + e.type);};
+
+            xhr.open("POST", "./resources/content.py", false);
+            xhr.send();
+
+            assert_equals(xhr.response, "");
+            assert_array_equals(actual, expect);
+        });
+    </script>
+</body>
+</html>
diff --git a/test/wpt/tests/xhr/send-sync-response-event-order.htm b/test/wpt/tests/xhr/send-sync-response-event-order.htm
new file mode 100644
index 00000000000..f7e4b0b216e
--- /dev/null
+++ b/test/wpt/tests/xhr/send-sync-response-event-order.htm
@@ -0,0 +1,35 @@
+<!DOCTYPE html>
+<html>
+<head>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <script src="resources/xmlhttprequest-event-order.js"></script>
+    <title>XMLHttpRequest: The send() method: event order when synchronous flag is set</title>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#handler-xhr-onloadstart" data-tested-assertations="../.." />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#handler-xhr-onloadend" data-tested-assertations="../.." />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#event-xhr-loadstart" data-tested-assertations="../.." />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#event-xhr-loadend" data-tested-assertations="../.." />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-send()-method" data-tested-assertations="following-sibling::ol/li[9]" />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#same-origin-request-steps" data-tested-assertations="following::DL[1]/DT[1]"/>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#infrastructure-for-the-send()-method" data-tested-assertations="following::dt[11] following::a[contains(@href,'#switch-done')]/.." />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#switch-done" data-tested-assertations="following::ol[1]/li[1] following::ol[1]/li[3] following::ol[1]/li[4] following::ol[1]/li[6] following::ol[1]/li[7]" />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-response-attribute" data-tested-assertations="following::ol/li[3]" />
+</head>
+
+<body>
+    <div id="log"></div>
+
+    <script type="text/javascript">
+        test(function () {
+            var xhr = new XMLHttpRequest();
+            prepare_xhr_for_event_order_test(xhr);
+
+            xhr.open("POST", "./resources/content.py", false);
+            xhr.send("Test Message");
+
+            assert_equals(xhr.response, "Test Message");
+            assert_xhr_event_order_matches([1, 4, "load(12,12,true)", "loadend(12,12,true)"]);
+        });
+    </script>
+</body>
+</html>
diff --git a/test/wpt/tests/xhr/send-sync-timeout.htm b/test/wpt/tests/xhr/send-sync-timeout.htm
new file mode 100644
index 00000000000..46d8686bc08
--- /dev/null
+++ b/test/wpt/tests/xhr/send-sync-timeout.htm
@@ -0,0 +1,29 @@
+<!doctype html>
+<html>
+  <head>
+    <title>XMLHttpRequest: timeout during sync send() should not run</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-send()-method"/>
+  </head>
+  <body>
+    <div id="log"></div>
+    <script>
+      var test = async_test(),
+          hasrun = false
+      test.step(function() {
+        client = new XMLHttpRequest()
+        client.open("GET", "folder.txt", false)
+        test.step_timeout(() => { hasrun = true }, 0)
+        client.onreadystatechange = function() {
+          test.step(function() {
+            assert_equals(client.readyState, 4)
+            assert_false(hasrun)
+          })
+        }
+        client.send(null)
+        test.done()
+      })
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/send-timeout-events.htm b/test/wpt/tests/xhr/send-timeout-events.htm
new file mode 100644
index 00000000000..eae25681077
--- /dev/null
+++ b/test/wpt/tests/xhr/send-timeout-events.htm
@@ -0,0 +1,62 @@
+<!DOCTYPE html>
+<html>
+<head>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <title>XMLHttpRequest: The send() method: timeout is not 0 </title>
+</head>
+
+<body>
+    <div id="log"></div>
+
+    <script type="text/javascript">
+        async_test(t => {
+            const xhr = new XMLHttpRequest(),
+                  expect = [4, "", "upload.timeout", "upload.loadend", "timeout", "loadend"];
+            let actual = [];
+
+            xhr.onreadystatechange = t.step_func(() => {
+                if (xhr.readyState == 4) {
+                    actual.push(xhr.readyState, xhr.response);
+                }
+            });
+
+            xhr.onloadend = t.step_func_done(e => {
+                assert_equals(e.loaded, 0);
+                assert_equals(e.total, 0);
+                actual.push(e.type);
+                assert_array_equals(actual, expect);
+            });
+
+            xhr.ontimeout = t.step_func(e => {
+                assert_equals(e.loaded, 0);
+                assert_equals(e.total, 0);
+                actual.push(e.type);
+            });
+
+
+            xhr.upload.onloadend = t.step_func(e => {
+                assert_equals(e.loaded, 0);
+                assert_equals(e.total, 0);
+                actual.push("upload." + e.type);
+            });
+
+            xhr.upload.ontimeout = t.step_func(e => {
+                assert_equals(e.loaded, 0);
+                assert_equals(e.total, 0);
+                actual.push("upload." + e.type);
+            });
+
+
+            let content = "";
+            for (var i = 0; i < 121026; i++) {
+                content += "[" + i + "]";
+            }
+
+            xhr.open("POST", "./resources/trickle.py", true);
+            xhr.timeout = 1;
+            xhr.send(content);
+        });
+    </script>
+</body>
+</html>
diff --git a/test/wpt/tests/xhr/send-usp.any.js b/test/wpt/tests/xhr/send-usp.any.js
new file mode 100644
index 00000000000..b0baf4a525a
--- /dev/null
+++ b/test/wpt/tests/xhr/send-usp.any.js
@@ -0,0 +1,46 @@
+const NUM_TESTS = 128;
+
+function encode(n) {
+  if (n === 0x20) {
+    return "\x2B";
+  }
+
+  if (n === 0x2A || n === 0x2D || n === 0x2E ||
+      (0x30 <= n && n <= 0x39) || (0x41 <= n && n <= 0x5A) ||
+      n === 0x5F || (0x61 <= n && n <= 0x7A)) {
+    return String.fromCharCode(n);
+  }
+
+  var s = n.toString(16).toUpperCase();
+  return "%" + (s.length === 2 ? s : '0' + s);
+}
+
+  var tests = [];
+  var overall_test = async_test("Overall fetch with URLSearchParams");
+  for (var i = 0; i < NUM_TESTS; i++) {
+    // Multiple subtests so that failures can be fine-grained
+    tests[i] = async_test("XMLHttpRequest.send(URLSearchParams) (" + i + ")");
+  }
+
+  // We use a single XHR since this test tends to time out
+  // with 128 consecutive fetches when run in parallel
+  // with many other WPT tests.
+  var x = new XMLHttpRequest();
+  x.onload = overall_test.step_func(function() {
+    var response_split = x.response.split("&");
+    overall_test.done();
+    for (var i = 0; i < NUM_TESTS; i++) {
+      tests[i].step(function() {
+        assert_equals(response_split[i], "a" + i + "="+encode(i));
+        tests[i].done();
+      });
+    }
+  });
+  x.onerror = overall_test.unreached_func();
+
+  x.open("POST", "resources/content.py");
+  var usp = new URLSearchParams();
+  for (var i = 0; i < NUM_TESTS; i++) {
+    usp.append("a" + i, String.fromCharCode(i));
+  }
+  x.send(usp)
diff --git a/test/wpt/tests/xhr/setrequestheader-after-send.htm b/test/wpt/tests/xhr/setrequestheader-after-send.htm
new file mode 100644
index 00000000000..174e9ec4196
--- /dev/null
+++ b/test/wpt/tests/xhr/setrequestheader-after-send.htm
@@ -0,0 +1,27 @@
+<!doctype html>
+<html>
+  <head>
+    <title>XMLHttpRequest: setRequestHeader() after send()</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-setrequestheader()-method" data-tested-assertations="/following::ol/li[2]" />
+  </head>
+  <body>
+    <div id="log"></div>
+    <script>
+      var test = async_test()
+      test.step(function() {
+        var client = new XMLHttpRequest()
+        client.open("GET", "resources/delay.py?ms=0")
+        client.onreadystatechange = function() {
+          test.step(function() {
+            assert_throws_dom("InvalidStateError", function() { client.setRequestHeader("x-test", "test") })
+            if(client.readyState == 4)
+              test.done()
+          })
+        }
+        client.send(null)
+      })
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/setrequestheader-allow-empty-value.htm b/test/wpt/tests/xhr/setrequestheader-allow-empty-value.htm
new file mode 100644
index 00000000000..4479504c2a6
--- /dev/null
+++ b/test/wpt/tests/xhr/setrequestheader-allow-empty-value.htm
@@ -0,0 +1,26 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>XMLHttpRequest: setRequestHeader() - empty header</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-setrequestheader()-method">
+  </head>
+  <body>
+    <div id="log"></div>
+    <script>
+      function request(value) {
+        test(function() {
+          var client = new XMLHttpRequest()
+          client.open("POST", "resources/inspect-headers.py?filter_name=X-Empty", false)
+          client.setRequestHeader('X-Empty', value)
+          client.send(null)
+          assert_equals(client.responseText, 'X-Empty: ' + value + '\n' )
+        }, document.title + " (" + value + ")")
+      }
+      request("")
+      request(null)
+      request(undefined)
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/setrequestheader-allow-whitespace-in-value.htm b/test/wpt/tests/xhr/setrequestheader-allow-whitespace-in-value.htm
new file mode 100644
index 00000000000..f2e0a370e66
--- /dev/null
+++ b/test/wpt/tests/xhr/setrequestheader-allow-whitespace-in-value.htm
@@ -0,0 +1,27 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>XMLHttpRequest: setRequestHeader() - header value with whitespace</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-setrequestheader()-method">
+  </head>
+  <body>
+    <div id="log"></div>
+    <script>
+      function request(value) {
+        test(function() {
+          var client = new XMLHttpRequest()
+          client.open("POST", "resources/inspect-headers.py?filter_name=X-Empty", false)
+          client.setRequestHeader('X-Empty', value)
+          client.send(null)
+          assert_equals(client.responseText, 'X-Empty: ' + value.trim() + '\n' )
+        }, document.title + " (" + value + ")")
+      }
+      request(" ")
+      request(" t")
+      request("t ")
+      request(" t ")
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/setrequestheader-before-open.htm b/test/wpt/tests/xhr/setrequestheader-before-open.htm
new file mode 100644
index 00000000000..5c377fbc100
--- /dev/null
+++ b/test/wpt/tests/xhr/setrequestheader-before-open.htm
@@ -0,0 +1,18 @@
+<!doctype html>
+<html>
+  <head>
+    <title>XMLHttpRequest: setRequestHeader() before open()</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-setrequestheader()-method" data-tested-assertations="following::ol/li[1]" />
+  </head>
+  <body>
+    <div id="log"></div>
+    <script>
+      test(function() {
+        var client = new XMLHttpRequest()
+        assert_throws_dom("InvalidStateError", function() { client.setRequestHeader("x-test", "test") })
+        }, 'setRequestHeader invoked before open()')
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/setrequestheader-bogus-name.htm b/test/wpt/tests/xhr/setrequestheader-bogus-name.htm
new file mode 100644
index 00000000000..ce2308cc67d
--- /dev/null
+++ b/test/wpt/tests/xhr/setrequestheader-bogus-name.htm
@@ -0,0 +1,59 @@
+<!doctype html>
+<html>
+  <head>
+    <title>XMLHttpRequest: setRequestHeader() name argument checks</title>
+    <meta charset="utf-8">
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-setrequestheader()-method" data-tested-assertations="/following::ol/li[3]" />
+  </head>
+  <body>
+    <div id="log"></div>
+<!--
+       CHAR           = <any US-ASCII character (octets 0 - 127)>
+       CTL            = <any US-ASCII control character
+                        (octets 0 - 31) and DEL (127)>
+       SP             = <US-ASCII SP, space (32)>
+       HT             = <US-ASCII HT, horizontal-tab (9)>
+       token          = 1*<any CHAR except CTLs or separators>
+       separators     = "(" | ")" | "<" | ">" | "@"
+                      | "," | ";" | ":" | "\" | <">
+                      | "/" | "[" | "]" | "?" | "="
+                      | "{" | "}" | SP | HT
+       field-name     = token
+-->
+    <script>
+      function try_name(name) {
+        test(function() {
+          var client = new XMLHttpRequest()
+          client.open("GET", "...")
+          assert_throws_dom("SyntaxError", function() { client.setRequestHeader(name, 'x-value') })
+        }, "setRequestHeader should throw with header name " + format_value(invalid_headers[i]) + ".")
+      }
+      function try_byte_string(name) {
+        test(function() {
+          var client = new XMLHttpRequest()
+          client.open("GET", "...")
+          assert_throws_js(TypeError, function() { client.setRequestHeader(name, 'x-value') })
+        }, "setRequestHeader should throw with header name " + format_value(invalid_byte_strings[i]) + ".")
+      }
+      var invalid_headers = ["(", ")", "<", ">", "@", ",", ";", ":", "\\",
+                             "\"", "/", "[", "]", "?", "=", "{", "}", " ",
+                             /* HT already tested in the loop below */
+                             "\u007f", "", "t\rt", "t\nt", "t: t", "t:t",
+                             "t<t", "t t", " tt", ":tt", "\ttt", "\vtt", "t\0t",
+                             "t\"t", "t,t", "t;t", "()[]{}", "a?B", "a=B"]
+      var invalid_byte_strings = ["ﾃｽﾄ", "X-ﾃｽﾄ"]
+      for (var i = 0; i < 32; ++i) {
+        invalid_headers.push(String.fromCharCode(i))
+      }
+      for (var i = 0; i < invalid_headers.length; ++i) {
+        try_name(invalid_headers[i])
+      }
+      for (var i = 0; i < invalid_byte_strings.length; ++i) {
+        try_byte_string(invalid_byte_strings[i])
+      }
+
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/setrequestheader-bogus-value.htm b/test/wpt/tests/xhr/setrequestheader-bogus-value.htm
new file mode 100644
index 00000000000..cba341c5dc6
--- /dev/null
+++ b/test/wpt/tests/xhr/setrequestheader-bogus-value.htm
@@ -0,0 +1,36 @@
+<!doctype html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>XMLHttpRequest: setRequestHeader() value argument checks</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-setrequestheader()-method" data-tested-assertations="/following::ol/li[4]" />
+  </head>
+  <body>
+    <div id="log"></div>
+    <script>
+      function try_value(value) {
+        test(function() {
+          var client = new XMLHttpRequest();
+          client.open("GET", "...");
+          assert_throws_dom("SyntaxError", function() { client.setRequestHeader("x-test", value) }, ' given value ' + value+', ');
+        });
+      }
+      try_value("t\x00t");
+      try_value("t\rt");
+      try_value("t\nt");
+      test(function() {
+        var client = new XMLHttpRequest();
+        client.open("GET", "...");
+        assert_throws_js(TypeError, function() { client.setRequestHeader("x-test", "ﾃｽﾄ") }, ' given value ﾃｽﾄ,');
+      });
+
+      test(function() {
+        var client = new XMLHttpRequest()
+        client.open("GET", "...")
+        assert_throws_js(TypeError, function() { client.setRequestHeader("x-test") })
+      }, 'Omitted value argument')
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/setrequestheader-case-insensitive.htm b/test/wpt/tests/xhr/setrequestheader-case-insensitive.htm
new file mode 100644
index 00000000000..1aed30d1c2a
--- /dev/null
+++ b/test/wpt/tests/xhr/setrequestheader-case-insensitive.htm
@@ -0,0 +1,34 @@
+<!doctype html>
+<html>
+  <head>
+    <title>XMLHttpRequest: setRequestHeader() - headers that differ in case</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-setrequestheader()-method">
+  </head>
+  <body>
+    <div id="log"></div>
+    <script>
+      test(function() {
+        var client = new XMLHttpRequest()
+        client.open("POST", "resources/inspect-headers.py?filter_value=t1, t2, t3", false)
+        client.setRequestHeader("x-test", "t1")
+        client.setRequestHeader("X-TEST", "t2")
+        client.setRequestHeader("X-teST", "t3")
+        client.send(null)
+        assert_equals(client.responseText, "x-test,")
+      })
+
+      test(() => {
+        const client = new XMLHttpRequest
+        client.open("GET", "resources/echo-headers.py", false)
+        client.setRequestHeader("THIS-IS-A-TEST", "1")
+        client.setRequestHeader("THIS-is-A-test", "2")
+        client.setRequestHeader("content-TYPE", "x/x")
+        client.send()
+        assert_regexp_match(client.responseText, /content-TYPE/)
+        assert_regexp_match(client.responseText, /THIS-IS-A-TEST: 1, 2/)
+      })
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/setrequestheader-combining.window.js b/test/wpt/tests/xhr/setrequestheader-combining.window.js
new file mode 100644
index 00000000000..fc847eb79a8
--- /dev/null
+++ b/test/wpt/tests/xhr/setrequestheader-combining.window.js
@@ -0,0 +1,12 @@
+test(() => {
+  const client = new XMLHttpRequest();
+  client.open("POST", "resources/inspect-headers.py?filter_name=test-me", false);
+  client.setRequestHeader("test-me", "");
+  client.setRequestHeader("test-me", "");
+  client.setRequestHeader("test-me", " ");
+  client.setRequestHeader("test-me", "\t");
+  client.setRequestHeader("test-me", "x\tx");
+  client.setRequestHeader("test-me", "");
+  client.send();
+  assert_equals(client.responseText, "test-me: , , , , x\tx, \n");
+}, "setRequestHeader() combining header values");
diff --git a/test/wpt/tests/xhr/setrequestheader-content-type.htm b/test/wpt/tests/xhr/setrequestheader-content-type.htm
new file mode 100644
index 00000000000..07238391eb5
--- /dev/null
+++ b/test/wpt/tests/xhr/setrequestheader-content-type.htm
@@ -0,0 +1,220 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>XMLHttpRequest: setRequestHeader() - Content-Type header</title>
+    <meta name="timeout" content="long">
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-setrequestheader()-method">
+  </head>
+  <body>
+    <div id="log"></div>
+    <script>
+      function request(inputGenerator, headersToSend, expectedType, title) {
+        test(function() {
+          const toSend = inputGenerator(),
+                client = new XMLHttpRequest()
+          client.open("POST", "resources/inspect-headers.py?filter_name=Content-Type", false)
+          for(header in headersToSend) {
+            if (headersToSend.hasOwnProperty(header)) {
+              client.setRequestHeader(header, headersToSend[header]);
+            }
+          }
+          client.send(toSend)
+
+          const actual = client.responseText
+          if (expectedType === undefined || expectedType === null) {
+            assert_equals(actual, "");
+          } else if (expectedType instanceof RegExp) {
+            assert_regexp_match(actual, expectedType);
+          } else {
+            assert_equals(actual, "Content-Type: " + expectedType + "\n");
+          }
+        }, title)
+      }
+      request(
+        function _String() { return ""; },
+        {"Content-Type": ""},
+        "",
+        'setRequestHeader("") sends a blank string'
+      )
+      request(
+        function _String() { return ""; },
+        {"Content-Type": " "},
+        "",
+        'setRequestHeader(" ") sends the string " "'
+      )
+      request(
+        function _String() { return ""; },
+        {"Content-Type": null},
+        "null",
+        'setRequestHeader(null) sends the string "null"'
+      )
+      request(
+        function _String() { return ""; },
+        {"Content-Type": undefined},
+        "undefined",
+        'setRequestHeader(undefined) sends the string "undefined"'
+      )
+      request(
+        function _String() { return "test"; },
+        {},
+        "text/plain;charset=UTF-8",
+        'String request has correct default Content-Type of "text/plain;charset=UTF-8"'
+      )
+      request(
+        function _String() { return "test()"; },
+        {"Content-Type": "text/javascript;charset=ASCII"},
+        "text/javascript;charset=UTF-8",
+        "String request keeps setRequestHeader() Content-Type, with charset adjusted to UTF-8"
+      )
+      request(
+        function _XMLDocument() { return new DOMParser().parseFromString("<xml/>", "application/xml"); },
+        {"Content-Type": ""},
+        "",
+        'XML Document request respects setRequestHeader("")'
+      )
+      request(
+        function _XMLDocument() { return new DOMParser().parseFromString("<xml/>", "application/xml"); },
+        {},
+        "application/xml;charset=UTF-8",
+        'XML Document request has correct default Content-Type of "application/xml;charset=UTF-8"'
+      )
+      request(
+        function _XMLDocument() { return new DOMParser().parseFromString("<xml/>", "application/xml"); },
+        {"Content-Type": "application/xhtml+xml;charset=ASCII"},
+        "application/xhtml+xml;charset=UTF-8",
+        "XML Document request keeps setRequestHeader() Content-Type, with charset adjusted to UTF-8"
+      )
+      request(
+        function _HTMLDocument() { return new DOMParser().parseFromString("<html></html>", "text/html"); },
+        {"Content-Type": ""},
+        "",
+        'HTML Document request respects setRequestHeader("")'
+      )
+      request(
+        function _HTMLDocument() { return new DOMParser().parseFromString("<html></html>", "text/html"); },
+        {},
+        "text/html;charset=UTF-8",
+        'HTML Document request has correct default Content-Type of "text/html;charset=UTF-8"'
+      )
+      request(
+        function _HTMLDocument() { return new DOMParser().parseFromString("<html></html>", "text/html"); },
+        {"Content-Type": "text/html+junk;charset=ASCII"},
+        "text/html+junk;charset=UTF-8",
+        "HTML Document request keeps setRequestHeader() Content-Type, with charset adjusted to UTF-8"
+      )
+      request(
+        function _Blob() { return new Blob(["test"]); },
+        {"Content-Type": ""},
+        "",
+        'Blob request respects setRequestHeader("") to be specified'
+      )
+      request(
+        function _Blob() { return new Blob(["test"]); },
+        {},
+        undefined,
+        "Blob request with unset type sends no Content-Type without setRequestHeader() call"
+      )
+      request(
+        function _Blob() { return new Blob(["test"]); },
+        {"Content-Type": "application/xml;charset=ASCII"},
+        "application/xml;charset=ASCII",
+        "Blob request with unset type keeps setRequestHeader() Content-Type and charset"
+      )
+      request(
+        function _Blob() { return new Blob(["<xml/>"], {type : "application/xml;charset=ASCII"}); },
+        {"Content-Type": ""},
+        "",
+        'Blob request with set type respects setRequestHeader("") to be specified'
+      )
+      request(
+        function _Blob() { return new Blob(["<xml/>"], {type : "application/xml;charset=ASCII"}); },
+        {},
+        "application/xml;charset=ascii", // new Blob lowercases the type argument
+        "Blob request with set type uses that it for Content-Type unless setRequestHeader()"
+      )
+      request(
+        function _Blob() { return new Blob(["<xml/>"], {type : "application/xml;charset=UTF8"}); },
+        {"Content-Type": "application/xml+junk;charset=ASCII"},
+        "application/xml+junk;charset=ASCII",
+        "Blob request with set type keeps setRequestHeader() Content-Type and charset"
+      )
+      request(
+        function _ArrayBuffer() { return new ArrayBuffer(10); },
+        {"Content-Type": ""},
+        "",
+        'ArrayBuffer request respects setRequestHeader("")'
+      )
+      request(
+        function _ArrayBuffer() { return new ArrayBuffer(10); },
+        {},
+        undefined,
+        "ArrayBuffer request sends no Content-Type without setRequestHeader() call"
+      )
+      request(
+        function _ArrayBuffer() { return new ArrayBuffer(10); },
+        {"Content-Type": "application/xml;charset=ASCII"},
+        "application/xml;charset=ASCII",
+        "ArrayBuffer request keeps setRequestHeader() Content-Type and charset"
+      )
+      request(
+        function _Uint8Array() { return new Uint8Array(new ArrayBuffer(10)); },
+        {"Content-Type": ""},
+        "",
+        'ArrayBufferView request respects setRequestHeader("")'
+      )
+      request(
+        function _Uint8Array() { return new Uint8Array(new ArrayBuffer(10)); },
+        {},
+        undefined,
+        "ArrayBufferView request sends no Content-Type without setRequestHeader() call"
+      )
+      request(
+        function _Uint8Array() { return new Uint8Array(new ArrayBuffer(10)); },
+        {"Content-Type": "application/xml;charset=ASCII"},
+        "application/xml;charset=ASCII",
+        "ArrayBufferView request keeps setRequestHeader() Content-Type and charset"
+      )
+      request(
+        function _FormData() { return new FormData(); },
+        {"Content-Type": ""},
+        "",
+        'FormData request respects setRequestHeader("")'
+      )
+      request(
+        function _FormData() { return new FormData(); },
+        {},
+        /multipart\/form-data; boundary=(.*)/,
+        'FormData request has correct default Content-Type of "multipart\/form-data; boundary=_"'
+      )
+      request(
+        function _FormData() { return new FormData(); },
+        {"Content-Type": "application/xml;charset=ASCII"},
+        "application/xml;charset=ASCII",
+        "FormData request keeps setRequestHeader() Content-Type and charset"
+      )
+      request(
+        function _URLSearchParams() { return new URLSearchParams("q=testQ&topic=testTopic") },
+        {"Content-Type": ""},
+        "",
+        'URLSearchParams respects setRequestHeader("")'
+      )
+      request(
+        function _URLSearchParams() { return new URLSearchParams("q=testQ&topic=testTopic") },
+        {},
+        "application/x-www-form-urlencoded;charset=UTF-8",
+        'URLSearchParams request has correct default Content-Type of "application/x-www-form-urlencoded;charset=UTF-8"'
+      )
+      request(
+        function _URLSearchParams() { return new URLSearchParams("q=testQ&topic=testTopic") },
+        {"Content-Type": "application/xml;charset=ASCII"},
+        "application/xml;charset=UTF-8",
+        "URLSearchParams request keeps setRequestHeader() Content-Type, with charset adjusted to UTF-8"
+        // the default Content-Type for URLSearchParams has a charset specified (utf-8) in
+        // https://fetch.spec.whatwg.org/#bodyinit, so the user's must be changed to match it
+        // as per https://xhr.spec.whatwg.org/#the-send%28%29-method step 4.
+      )
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/setrequestheader-header-allowed.htm b/test/wpt/tests/xhr/setrequestheader-header-allowed.htm
new file mode 100644
index 00000000000..14b7187d3ac
--- /dev/null
+++ b/test/wpt/tests/xhr/setrequestheader-header-allowed.htm
@@ -0,0 +1,34 @@
+<!doctype html>
+<html>
+  <head>
+    <title>XMLHttpRequest: setRequestHeader() - headers that are allowed</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-setrequestheader()-method">
+  </head>
+  <body>
+    <div id="log"></div>
+    <script>
+      function request(header) {
+        test(function() {
+          var client = new XMLHttpRequest()
+          client.open("POST", "resources/inspect-headers.py?filter_value=t1, t2", false)
+          client.setRequestHeader(header, "t1")
+          client.setRequestHeader(header, "t2")
+          client.send(null)
+          assert_equals(client.responseText, header + ",")
+        }, document.title + " (" + header + ")")
+      }
+      request("Authorization")
+      request("Pragma")
+      request("User-Agent")
+      request("Content-Transfer-Encoding")
+      request("Content-Type")
+      request("Overwrite")
+      request("If")
+      request("Status-URI")
+      request("X-Pink-Unicorn")
+      request("!#$%&'*+-.^_`|~0123456789abcdefghijklmnopqrstuvwxyz")
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/setrequestheader-header-forbidden.htm b/test/wpt/tests/xhr/setrequestheader-header-forbidden.htm
new file mode 100644
index 00000000000..0b273776bc1
--- /dev/null
+++ b/test/wpt/tests/xhr/setrequestheader-header-forbidden.htm
@@ -0,0 +1,95 @@
+<!doctype html>
+<html>
+  <head>
+    <title>XMLHttpRequest: setRequestHeader() - headers that are forbidden</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-setrequestheader()-method">
+
+  </head>
+  <body>
+    <div id="log"></div>
+    <script>
+      test(function() {
+        var client = new XMLHttpRequest()
+        client.open("POST", "resources/inspect-headers.py?filter_value=TEST", false)
+        client.setRequestHeader("Accept-Charset", "TEST")
+        client.setRequestHeader("Accept-Encoding", "TEST")
+        client.setRequestHeader("Connection", "TEST")
+        client.setRequestHeader("Content-Length", "TEST")
+        client.setRequestHeader("Cookie", "TEST")
+        client.setRequestHeader("Cookie2", "TEST")
+        client.setRequestHeader("Date", "TEST")
+        client.setRequestHeader("DNT", "TEST")
+        client.setRequestHeader("Expect", "TEST")
+        client.setRequestHeader("Host", "TEST")
+        client.setRequestHeader("Keep-Alive", "TEST")
+        client.setRequestHeader("Referer", "TEST")
+        client.setRequestHeader("TE", "TEST")
+        client.setRequestHeader("Trailer", "TEST")
+        client.setRequestHeader("Transfer-Encoding", "TEST")
+        client.setRequestHeader("Upgrade", "TEST")
+        client.setRequestHeader("Via", "TEST")
+        client.setRequestHeader("Proxy-", "TEST")
+        client.setRequestHeader("Proxy-LIES", "TEST")
+        client.setRequestHeader("Proxy-Authorization", "TEST")
+        client.setRequestHeader("Sec-", "TEST")
+        client.setRequestHeader("Sec-X", "TEST")
+        client.send(null)
+        assert_equals(client.responseText, "")
+        })
+
+        test (function() {
+
+        let forbiddenMethods = [
+          "TRACE",
+          "TRACK",
+          "CONNECT",
+          "trace",
+          "track",
+          "connect",
+          "trace,",
+          "GET,track ",
+          " connect",
+        ];
+
+        let overrideHeaders = [
+          "x-http-method-override",
+          "x-http-method",
+          "x-method-override",
+          "X-HTTP-METHOD-OVERRIDE",
+          "X-HTTP-METHOD",
+          "X-METHOD-OVERRIDE",
+        ];
+
+        for (forbiddenMethod of forbiddenMethods) {
+          for (overrideHeader of overrideHeaders) {
+             var client = new XMLHttpRequest()
+             client.open("POST",
+                     `resources/inspect-headers.py?filter_value=${forbiddenMethod}`, false)
+             client.setRequestHeader(overrideHeader, forbiddenMethod)
+             client.send(null)
+             assert_equals(client.responseText, "")
+          }
+        }
+
+        let permittedValues = [
+        "GETTRACE",
+        "GET",
+        "\",TRACE\",",
+        ];
+
+        for (permittedValue of permittedValues) {
+          for (overrideHeader of overrideHeaders) {
+             var client = new XMLHttpRequest()
+             client.open("POST",
+                     `resources/inspect-headers.py?filter_name=${overrideHeader}`, false)
+             client.setRequestHeader(overrideHeader, permittedValue)
+             client.send(null)
+             assert_equals(client.responseText, overrideHeader + ": " + permittedValue + "\n")
+          }
+        }
+      })
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/setrequestheader-open-setrequestheader.htm b/test/wpt/tests/xhr/setrequestheader-open-setrequestheader.htm
new file mode 100644
index 00000000000..d77d34ffb83
--- /dev/null
+++ b/test/wpt/tests/xhr/setrequestheader-open-setrequestheader.htm
@@ -0,0 +1,53 @@
+<!DOCTYPE html>
+<!--
+Test from https://bugzilla.mozilla.org/show_bug.cgi?id=819051
+-->
+<head>
+  <title>XMLHttpRequest: setRequestHeader() and open()</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-open()-method">
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-setrequestheader()-method">
+</head>
+<body>
+    <p id="log"></p>
+<script type="text/javascript">
+async_test(test => {
+
+var url = "resources/inspect-headers.py";
+
+var xhr = new XMLHttpRequest();
+xhr.open("GET", url + "?filter_name=x-appended-to-this");
+xhr.setRequestHeader("X-appended-to-this", "False");
+xhr.open("GET", url + "?filter_name=x-appended-to-this");
+xhr.setRequestHeader("X-appended-to-this", "True");
+
+xhr.onreadystatechange = test.step_func(() => {
+    if (xhr.readyState == 4) {
+        assert_equals(xhr.responseText, "X-appended-to-this: True\n", "Set headers record should have been cleared by open.");
+        test_standard_header();
+    }
+})
+
+xhr.send();
+
+function test_standard_header () {
+    var header_tested = "Accept";
+    var xhr = new XMLHttpRequest();
+    xhr.open("GET", url + "?filter_name=accept");
+    xhr.setRequestHeader("Accept", "foo/bar");
+    xhr.open("GET", url + "?filter_name=accept");
+    xhr.setRequestHeader("Accept", "bar/foo");
+
+    xhr.onreadystatechange = test.step_func(() => {
+        if (xhr.readyState == 4) {
+            assert_equals(xhr.responseText, "Accept: bar/foo\n", "Set headers record should have been cleared by open.");
+            test.done();
+        }
+    })
+
+    xhr.send();
+}
+
+})
+</script>
diff --git a/test/wpt/tests/xhr/status-async.htm b/test/wpt/tests/xhr/status-async.htm
new file mode 100644
index 00000000000..dcf7d62467a
--- /dev/null
+++ b/test/wpt/tests/xhr/status-async.htm
@@ -0,0 +1,62 @@
+<!doctype html>
+<html>
+  <head>
+    <title>XMLHttpRequest: status/statusText - various responses</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-status-attribute" data-tested-assertations="following::ol/li[1] following::ol/li[3]" />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-statustext-attribute" data-tested-assertations="following::ol/li[1] following::ol/li[3]" />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-getresponseheader()-method" data-tested-assertations="following::ol/li[5]" />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-responsetext-attribute" data-tested-assertations="following::ol/li[4]" />
+  </head>
+  <body>
+    <div id="log"></div>
+    <script>
+      var counter=0
+      function statusRequest(method, code, text, content, type) {
+        counter++
+        var test = async_test(document.title +' '+ counter+" (" + method + " " + code + ")")
+        test.step(function() {
+          var client = new XMLHttpRequest()
+          client.onreadystatechange = function(e) {
+            test.step(function() {
+              if(client.readyState > 1) {
+                assert_equals(client.status, code)
+                assert_equals(client.statusText, text)
+                assert_equals(client.getResponseHeader("X-Request-Method"), method)
+                if(client.readyState == 4) {
+                  if(method != "HEAD") {
+                    if(type == "text/xml") {
+                      assert_equals(client.responseXML.documentElement.localName, "x")
+                    }
+                    assert_equals(client.responseText, content)
+                  }
+                  test.done()
+                }
+              }else{
+                assert_equals(client.status, 0)
+                assert_equals(client.statusText, "")
+              }
+            }, this)
+          }
+          client.open(method, "resources/status.py?code=" + encodeURIComponent(code) + "&text=" + text + "&content=" + encodeURIComponent(content) + "&type=" + encodeURIComponent(type))
+          client.send(null)
+        })
+      }
+      function status(code, text, content, type) {
+        statusRequest("GET", code, text, content, type)
+        statusRequest("HEAD", code, text, content, type)
+        statusRequest("CHICKEN", code, text, content, type)
+      }
+      status(204, "UNICORNSWIN", "", "")
+      status(401, "OH HELLO", "Not today.", "")
+      status(402, "FIVE BUCKS", "<x>402<\/x>", "text/xml")
+      status(402, "FREE", "Nice!", "text/doesnotmatter")
+      status(402, "402 TEH AWESOME", "", "")
+      status(502, "YO", "", "")
+      status(502, "lowercase", "SWEET POTATO", "text/plain")
+      status(503, "HOUSTON WE HAVE A", "503", "text/plain")
+      status(699, "WAY OUTTA RANGE", "699", "text/plain")
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/status-basic.htm b/test/wpt/tests/xhr/status-basic.htm
new file mode 100644
index 00000000000..fed7cabec47
--- /dev/null
+++ b/test/wpt/tests/xhr/status-basic.htm
@@ -0,0 +1,51 @@
+<!doctype html>
+<html>
+  <head>
+    <title>XMLHttpRequest: status/statusText - various responses</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-status-attribute" data-tested-assertations="following::ol/li[3]" />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-statustext-attribute" data-tested-assertations="following::ol/li[3]" />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-getresponseheader()-method" data-tested-assertations="following::ol/li[5]" />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-responsetext-attribute" data-tested-assertations="following::ol/li[4]" />
+  </head>
+  <body>
+    <div id="log"></div>
+    <script>
+    var counter = 0
+      function statusRequest(method, code, text, content, type) {
+        counter++
+        test(function() {
+          var client = new XMLHttpRequest()
+          assert_equals(client.status, 0);
+          client.open(method, "resources/status.py?code=" + code + "&text=" + encodeURIComponent(text) + "&content=" + encodeURIComponent(content) + "&type=" + encodeURIComponent(type), false)
+          assert_equals(client.status, 0);
+          client.send(null)
+          assert_equals(client.status, code)
+          assert_equals(client.statusText, text)
+          assert_equals(client.getResponseHeader("X-Request-Method"), method)
+          if(method != "HEAD") {
+            if(type == "text/xml") {
+              assert_equals(client.responseXML.documentElement.localName, "x")
+            }
+            assert_equals(client.responseText, content)
+          }
+        }, document.title + " " + counter + " (" + method + " " + code + ")")
+      }
+      function status(code, text, content, type) {
+        statusRequest("GET", code, text, content, type)
+        statusRequest("HEAD", code, text, content, type)
+        statusRequest("CHICKEN", code, text, content, type)
+      }
+      status(204, "UNICORNSWIN", "", "")
+      status(401, "OH HELLO", "Not today.", "")
+      status(402, "FIVE BUCKS", "<x>402<\/x>", "text/xml")
+      status(402, "FREE", "Nice!", "text/doesnotmatter")
+      status(402, "402 TEH AWESOME", "", "")
+      status(502, "YO", "", "")
+      status(502, "lowercase", "SWEET POTATO", "text/plain")
+      status(503, "HOUSTON WE HAVE A", "503", "text/plain")
+      status(699, "WAY OUTTA RANGE", "699", "text/plain")
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/status-error.htm b/test/wpt/tests/xhr/status-error.htm
new file mode 100644
index 00000000000..76709c23d10
--- /dev/null
+++ b/test/wpt/tests/xhr/status-error.htm
@@ -0,0 +1,87 @@
+<!doctype html>
+<html>
+  <head>
+    <title>XMLHttpRequest: status error handling</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#handler-xhr-onerror" data-tested-assertations="../.." />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-status-attribute" data-tested-assertations="/following::ol/li[3]" />
+  </head>
+  <body>
+    <p>This shouldn't be tested inside a tunnel.</p>
+    <div id="log"></div>
+    <script>
+      function noError(method, code) {
+        var test = async_test(document.title + " " + method + " " + code)
+
+        test.step(function() {
+          var client = new XMLHttpRequest()
+          client.open(method, "resources/status.py?code=" + code, true)
+
+          client.onreadystatechange = test.step_func(function() {
+            assert_equals(client.response, "", "response data")
+            assert_equals(client.status, code, "response status")
+
+            if (client.readyState == client.DONE)
+              /* Give extra time for a bogus error event to pop up */
+              test.step_timeout(() => { test.done() }, 100)
+          })
+          client.onerror = test.step_func(function() {
+            assert_unreached("HTTP error should not throw error event")
+          })
+          client.send()
+        })
+      }
+
+      function unknownScheme() {
+        test(() => {
+          var client = new XMLHttpRequest();
+          client.open("GET", "foobar://dummy", false);
+          try {
+            client.send();
+          } catch(ex) {}
+          assert_equals(client.status, 0, "response data");
+        }, "Unknown scheme");
+      }
+
+
+      function postOnBlob() {
+        test(() => {
+          var u = URL.createObjectURL(new Blob([""], {type: 'text/plain'}));
+          var client = new XMLHttpRequest();
+          client.open("POST", u, false);
+          try {
+            client.send();
+          } catch(ex) {}
+          assert_equals(client.status, 0, "response data");
+        }, "POST on blob uri");
+      }
+
+      noError('GET', 200)
+      noError('GET', 400)
+      noError('GET', 401)
+      noError('GET', 404)
+      noError('GET', 410)
+      noError('GET', 500)
+      noError('GET', 699)
+
+      noError('HEAD', 200)
+      noError('HEAD', 404)
+      noError('HEAD', 500)
+      noError('HEAD', 699)
+
+      noError('POST', 200)
+      noError('POST', 404)
+      noError('POST', 500)
+      noError('POST', 699)
+
+      noError('PUT', 200)
+      noError('PUT', 404)
+      noError('PUT', 500)
+      noError('PUT', 699)
+
+      unknownScheme();
+      postOnBlob();
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/status.h2.window.js b/test/wpt/tests/xhr/status.h2.window.js
new file mode 100644
index 00000000000..13aa2b3ad87
--- /dev/null
+++ b/test/wpt/tests/xhr/status.h2.window.js
@@ -0,0 +1,21 @@
+// See also /fetch/api/basic/status.h2.any.js
+
+[
+  200,
+  210,
+  400,
+  404,
+  410,
+  500,
+  502
+].forEach(status => {
+  async_test(t => {
+    const client = new XMLHttpRequest();
+    client.open("GET", "/xhr/resources/status.py?code=" + status);
+    client.send();
+    client.onload = t.step_func_done(() => {
+      assert_equals(client.status, status, "status should be " + status);
+      assert_equals(client.statusText, "", "statusText should be the empty string");
+    });
+  }, "statusText over H2 for status " + status + " should be the empty string");
+});
diff --git a/test/wpt/tests/xhr/sync-no-progress.any.js b/test/wpt/tests/xhr/sync-no-progress.any.js
new file mode 100644
index 00000000000..aba82043a7a
--- /dev/null
+++ b/test/wpt/tests/xhr/sync-no-progress.any.js
@@ -0,0 +1,13 @@
+// META: timeout=long
+test(t => {
+  let xhr = new XMLHttpRequest();
+  let loadEventFired = false;
+  xhr.onprogress = t.unreached_func('progress event should not be fired');
+  xhr.onload = () => {
+    loadEventFired = true;
+  };
+  xhr.open('GET', 'resources/trickle.py?count=4&delay=150', false);
+  xhr.send();
+  // Check the load event as a sanity check that the test is working.
+  assert_true(loadEventFired, 'load event should have fired');
+}, 'progress event should not be fired by sync XHR');
diff --git a/test/wpt/tests/xhr/sync-no-timeout.any.js b/test/wpt/tests/xhr/sync-no-timeout.any.js
new file mode 100644
index 00000000000..ac73e0bf05d
--- /dev/null
+++ b/test/wpt/tests/xhr/sync-no-timeout.any.js
@@ -0,0 +1,16 @@
+// META: global=window,dedicatedworker,sharedworker
+// META: timeout=long
+
+// This is a regression test for https://crbug.com/844268, when a timeout of 10
+// seconds was applied to XHR in Chrome. There should be no timeout unless the
+// "timeout" parameter is set on the object.
+test(t => {
+  let xhr = new XMLHttpRequest();
+
+  // For practical reasons, we can't wait forever. 12 seconds is long enough to
+  // reliably reproduce the bug in Chrome.
+  xhr.open('GET', 'resources/trickle.py?ms=1000&count=12', false);
+
+  // The test will fail if this throws.
+  xhr.send();
+}, 'Sync XHR should not have a timeout');
diff --git a/test/wpt/tests/xhr/sync-xhr-and-window-onload.html b/test/wpt/tests/xhr/sync-xhr-and-window-onload.html
new file mode 100644
index 00000000000..3ba9e7ab2e8
--- /dev/null
+++ b/test/wpt/tests/xhr/sync-xhr-and-window-onload.html
@@ -0,0 +1,25 @@
+<!doctype html>
+<body>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script>
+async_test((t) => {
+  let onloadIsCalled = false;
+  window.addEventListener('load', () => {
+    onloadIsCalled = true;
+  }, {once: true});
+  document.addEventListener('readystatechange', t.step_func(() => {
+    if (document.readyState !== 'complete') {
+      return;
+    }
+    const xhr = new XMLHttpRequest();
+    xhr.open('GET', 'resources/pass.txt', false /* async */);
+    xhr.send();
+    assert_false(onloadIsCalled);
+    // The load event eventually arrives.
+    window.addEventListener('load', t.step_func_done(() => {
+    }), {once: 'true'});
+  }));
+}, 'sync XHR should not fire window.onload synchronously');
+</script>
+</body>
diff --git a/test/wpt/tests/xhr/sync-xhr-supported-by-feature-policy.html b/test/wpt/tests/xhr/sync-xhr-supported-by-feature-policy.html
new file mode 100644
index 00000000000..45588bf6af5
--- /dev/null
+++ b/test/wpt/tests/xhr/sync-xhr-supported-by-feature-policy.html
@@ -0,0 +1,11 @@
+<!DOCTYPE html>
+<title>Test that sync-xhr is advertised in the feature list</title>
+<link rel="help" href="https://w3c.github.io/webappsec-feature-policy/#dom-featurepolicy-features">
+<link rel="help" href="https://xhr.spec.whatwg.org/#feature-policy-integration">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script>
+test(() => {
+    assert_in_array('sync-xhr', document.featurePolicy.features());
+}, 'document.featurePolicy.features should advertise sync-xhr.');
+</script>
diff --git a/test/wpt/tests/xhr/template-element.html b/test/wpt/tests/xhr/template-element.html
new file mode 100644
index 00000000000..c23c99788e4
--- /dev/null
+++ b/test/wpt/tests/xhr/template-element.html
@@ -0,0 +1,36 @@
+<!doctype html>
+<title>XMLHttpRequest: template element parsing</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<div id=log></div>
+<script>
+async_test(t => {
+  const client = new XMLHttpRequest
+  client.open("GET", "data:text/xml,<template xmlns='http://www.w3.org/1999/xhtml'><test/></template>")
+  client.send()
+  client.onload = t.step_func_done(() => {
+    assert_equals(client.responseXML.documentElement.childElementCount, 0)
+    assert_equals(client.responseXML.documentElement.content.firstChild.localName, "test")
+  })
+})
+
+async_test(t => {
+  const client = new XMLHttpRequest
+  client.open("GET", "data:text/xml,<template><test/></template>")
+  client.send()
+  client.onload = t.step_func_done(() => {
+    assert_equals(client.responseXML.documentElement.childElementCount, 1)
+    assert_equals(client.responseXML.documentElement.firstChild.localName, "test")
+  })
+})
+
+async_test(t => {
+  const client = new XMLHttpRequest
+  client.open("GET", "data:text/xml,<template xmlns='http://www.w3.org/2000/svg'><test/></template>")
+  client.send()
+  client.onload = t.step_func_done(() => {
+    assert_equals(client.responseXML.documentElement.childElementCount, 1)
+    assert_equals(client.responseXML.documentElement.firstChild.localName, "test")
+  })
+})
+</script>
diff --git a/test/wpt/tests/xhr/thrown-error-in-events.html b/test/wpt/tests/xhr/thrown-error-in-events.html
new file mode 100644
index 00000000000..d8f19335926
--- /dev/null
+++ b/test/wpt/tests/xhr/thrown-error-in-events.html
@@ -0,0 +1,60 @@
+<!DOCTYPE html>
+<title>Errors thrown in XMLHttpRequest events get to window.onerror</title>
+<link rel="author" title="Domenic Denicola" href="mailto:d@domenic.me">
+
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+
+<script>
+"use strict";
+
+setup({ allow_uncaught_exception: true });
+
+promise_test(() => {
+  const error = new Error("oh no!");
+  let resolve;
+
+  window.addEventListener("error", event => {
+    assert_equals(event.error, error);
+    resolve();
+  });
+
+  const xhr = new window.XMLHttpRequest();
+
+  xhr.addEventListener("load", () => {
+    throw error;
+  });
+
+  xhr.open("GET", location.href);
+  xhr.send();
+
+  return new Promise(r => {
+    resolve = r;
+  });
+
+}, "errors thrown in XMLHttpRequest's load event (using addEventListener) goes to window.onerror");
+
+promise_test(() => {
+  const error = new Error("oh no 2!");
+  let resolve;
+
+  window.addEventListener("error", event => {
+    assert_equals(event.error, error);
+    resolve();
+  });
+
+  const xhr = new window.XMLHttpRequest();
+
+  xhr.onload = () => {
+    throw error;
+  };
+
+  xhr.open("GET", location.href);
+  xhr.send();
+
+  return new Promise(r => {
+    resolve = r;
+  });
+
+}, "errors thrown in XMLHttpRequest's load event (using onload) goes to window.onerror");
+</script>
diff --git a/test/wpt/tests/xhr/timeout-cors-async.htm b/test/wpt/tests/xhr/timeout-cors-async.htm
new file mode 100644
index 00000000000..74397ba8c40
--- /dev/null
+++ b/test/wpt/tests/xhr/timeout-cors-async.htm
@@ -0,0 +1,43 @@
+<!doctype html>
+<html>
+  <head>
+    <title>XMLHttpRequest: timeout event and cross-origin request</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-timeout-attribute" data-tested-assertations="following::ol[1]/li[2]" />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#handler-xhr-ontimeout" data-tested-assertations="../.."/>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#timeout-error" data-tested-assertations=".."/>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#request-error" data-tested-assertations="following::ol[1]/li[4] following::ol[1]/li[9]"/>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#cross-origin-request-event-rules" data-tested-assertations="following::dl//code[contains(@title,'dom-XMLHttpRequest-timeout')]/.. following::dl//code[contains(@title,'dom-XMLHttpRequest-timeout')]/../following-sibling::dd following::dt[1] following::dd[1]" />
+  </head>
+  <body>
+    <div id="log"></div>
+    <script>
+      var test = async_test()
+      var client = new XMLHttpRequest()
+      var gotTimeout = false
+      client.open("GET", "http://www2." + location.hostname + (location.port ? ":" + location.port : "") +(location.pathname.replace(/[^\/]+$/, '')+'resources/corsenabled.py')+"?delay=2&code=200")
+      client.timeout = 100
+      client.addEventListener('timeout', function (e) {
+        test.step(function() {
+          assert_equals(e.type, 'timeout')
+          assert_equals(client.status, 0)
+          gotTimeout = true
+        })
+      })
+      client.addEventListener('load', function (e) {
+        test.step(function() {
+          assert_unreached('load event should not fire')
+        })
+      })
+      client.addEventListener('loadend', function (e) {
+        test.step(function() {
+          assert_true(gotTimeout, "timeout event should fire")
+          test.done()
+        })
+      })
+
+      client.send(null)
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/timeout-multiple-fetches.html b/test/wpt/tests/xhr/timeout-multiple-fetches.html
new file mode 100644
index 00000000000..4f4998c4285
--- /dev/null
+++ b/test/wpt/tests/xhr/timeout-multiple-fetches.html
@@ -0,0 +1,32 @@
+<!doctype html>
+<title>XMLHttpRequest: timeout, redirects, and CORS preflights</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=/common/get-host-info.sub.js></script>
+<script src=/common/utils.js></script>
+<div id=log></div>
+<script>
+async_test(t => {
+  const client = new XMLHttpRequest
+  client.open("GET", "resources/redirect.py?delay=500&location=delay.py") // 500 + 500 = 1000
+  client.timeout = 750
+  client.send()
+  client.ontimeout = t.step_func_done(() => {
+    assert_equals(client.readyState, 4)
+  })
+  client.onload = t.unreached_func("load event fired")
+}, "Redirects should not reset the timer")
+
+async_test(t => {
+  // Use a unique ID to prevent caching of the preflight making the test flaky.
+  const uuid = token();
+  const client = new XMLHttpRequest
+  client.open("YO", get_host_info().HTTP_REMOTE_ORIGIN + "/xhr/resources/delay.py?uuid=" + uuid)
+  client.timeout = 750
+  client.send()
+  client.ontimeout = t.step_func_done(() => {
+    assert_equals(client.readyState, 4)
+  })
+  client.onload = t.unreached_func("load event fired")
+}, "CORS preflights should not reset the timer")
+</script>
diff --git a/test/wpt/tests/xhr/timeout-sync.htm b/test/wpt/tests/xhr/timeout-sync.htm
new file mode 100644
index 00000000000..d8b2cc48f36
--- /dev/null
+++ b/test/wpt/tests/xhr/timeout-sync.htm
@@ -0,0 +1,25 @@
+<!doctype html>
+<html>
+  <head>
+    <title>XMLHttpRequest: timeout not allowed for sync requests</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-timeout-attribute" data-tested-assertations="following::ol/li[1]" />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-open()-method" data-tested-assertations="following::ol/li[10]" />
+  </head>
+  <body>
+    <div id="log"></div>
+    <script>
+      test(function() {
+        var client = new XMLHttpRequest()
+        client.open('GET', 'folder.txt', false)
+        assert_throws_dom("InvalidAccessError", function() { client.timeout = 1000 })
+        }, 'setting timeout attribute on sync request')
+      test(function() {
+        var client = new XMLHttpRequest()
+        client.timeout = 1000
+        assert_throws_dom("InvalidAccessError", function() { client.open('GET', 'folder.txt', false) })
+        }, 'open() with async false when timeout is set')
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/xhr-authorization-redirect.any.js b/test/wpt/tests/xhr/xhr-authorization-redirect.any.js
new file mode 100644
index 00000000000..beed7c31d70
--- /dev/null
+++ b/test/wpt/tests/xhr/xhr-authorization-redirect.any.js
@@ -0,0 +1,28 @@
+// META: global=window,sharedworker,dedicatedworker
+// META: script=/common/get-host-info.sub.js
+
+const authorizationValue = "Basic " + btoa("user:pass");
+function getAuthorizationHeaderValue(url)
+{
+  var client = new XMLHttpRequest();
+  client.open("GET", url, false);
+  client.setRequestHeader("Authorization", authorizationValue);
+  const promise = new Promise(resolve => client.onloadend = () => resolve(client.responseText));
+  client.send();
+  return promise;
+}
+
+promise_test(async test => {
+  const result = await getAuthorizationHeaderValue("/fetch/api/resources/dump-authorization-header.py");
+  assert_equals(result, authorizationValue);
+}, "getAuthorizationHeaderValue - no redirection");
+
+promise_test(async test => {
+  const result = await getAuthorizationHeaderValue("/fetch/api/resources/redirect.py?location=" + encodeURIComponent("/fetch/api/resources/dump-authorization-header.py"));
+  assert_equals(result, authorizationValue);
+}, "getAuthorizationHeaderValue - same origin redirection");
+
+promise_test(async (test) => {
+  const result = await getAuthorizationHeaderValue(get_host_info().HTTP_REMOTE_ORIGIN + "/fetch/api/resources/redirect.py?allow_headers=Authorization&location=" + encodeURIComponent(get_host_info().HTTP_ORIGIN + "/fetch/api/resources/dump-authorization-header.py"));
+  assert_equals(result, "none");
+}, "getAuthorizationHeaderValue - cross origin redirection");
diff --git a/test/wpt/tests/xhr/xhr-timeout-longtask.any.js b/test/wpt/tests/xhr/xhr-timeout-longtask.any.js
new file mode 100644
index 00000000000..161713104ae
--- /dev/null
+++ b/test/wpt/tests/xhr/xhr-timeout-longtask.any.js
@@ -0,0 +1,14 @@
+async_test(function() {
+  var client = new XMLHttpRequest();
+  client.open("GET", "resources/delay.py?ms=100", true);
+
+  client.timeout = 150;
+  client.ontimeout = this.step_func(assert_unreached);
+  client.onloadend = () => this.done();
+
+  client.send();
+
+  const start = performance.now();
+  while (performance.now() - start < 200) { }
+}, "Long tasks should not trigger load timeout")
+
diff --git a/test/wpt/tests/xhr/xmlhttprequest-basic.htm b/test/wpt/tests/xhr/xmlhttprequest-basic.htm
new file mode 100644
index 00000000000..c48b610ff66
--- /dev/null
+++ b/test/wpt/tests/xhr/xmlhttprequest-basic.htm
@@ -0,0 +1,45 @@
+<!doctype html>
+<html>
+  <head>
+    <title>XMLHttpRequest: prototype and members</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#dom-xmlhttprequest" data-tested-assertations="following::ol/li[1]" />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#xmlhttprequest" data-tested-assertations="." />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#states" data-tested-assertations="following::dfn[2] following::dfn[3] following::dfn[4] following::dfn[5] following::dfn[6]" />
+  </head>
+  <body>
+    <div id="log"></div>
+    <script>
+      test(function() {
+        XMLHttpRequest.prototype.test = function() { return "TEH" }
+        var client = new XMLHttpRequest()
+        assert_equals(client.test(), "TEH")
+        var members = ["onreadystatechange",
+                       "open",
+                       "setRequestHeader",
+                       "send",
+                       "abort",
+                       "status",
+                       "statusText",
+                       "getResponseHeader",
+                       "getAllResponseHeaders",
+                       "responseText",
+                       "responseXML"]
+        for(var x in members)
+          assert_true(members[x] in client, members[x])
+        var constants = ["UNSENT",
+                         "OPENED",
+                         "HEADERS_RECEIVED",
+                         "LOADING",
+                         "DONE"],
+            i = 0
+        for(var x in constants) {
+          assert_equals(client[constants[x]], i, constants[x])
+          assert_equals(XMLHttpRequest[constants[x]], i, "XHR " + constants[x])
+          i++
+        }
+      })
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/xmlhttprequest-eventtarget.htm b/test/wpt/tests/xhr/xmlhttprequest-eventtarget.htm
new file mode 100644
index 00000000000..ea58fd4dc3e
--- /dev/null
+++ b/test/wpt/tests/xhr/xmlhttprequest-eventtarget.htm
@@ -0,0 +1,48 @@
+<!doctype html>
+<html>
+  <head>
+    <title>XMLHttpRequest: implements EventTarget</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#xmlhttprequesteventtarget" data-tested-assertations=".." />
+    <!-- Obviously, most of the stuff actually being tested here is covered in the DOM events spec, not in the XHR spec -->
+  </head>
+  <body>
+    <div id="log"></div>
+    <script>
+      var test = async_test(),
+          x = null,
+          expected = ["a1", "b1", "c1", "a2", "b2", "c2", "a3", "c3", "a4", "c4"],
+          result = []
+      function callback(e) {
+        result.push("b" + x.readyState)
+        test.step(function() {
+          if(x.readyState == 3)
+            assert_unreached()
+        })
+      }
+      test.step(function() {
+        x = new XMLHttpRequest()
+        x.onreadystatechange = function() {
+          test.step(function() {
+            result.push("a" + x.readyState)
+          })
+        }
+        x.addEventListener("readystatechange", callback, false)
+        x.addEventListener("readystatechange", function() {
+          test.step(function() {
+            result.push("c" + x.readyState)
+            if(x.readyState == 2)
+              x.removeEventListener("readystatechange", callback, false)
+            if(x.readyState == 4) {
+              assert_array_equals(result, expected)
+              test.done()
+            }
+          })
+        }, false)
+        x.open("GET", "folder.txt")
+        x.send(null)
+      })
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/xmlhttprequest-network-error-sync.htm b/test/wpt/tests/xhr/xmlhttprequest-network-error-sync.htm
new file mode 100644
index 00000000000..ee367fbe0ee
--- /dev/null
+++ b/test/wpt/tests/xhr/xmlhttprequest-network-error-sync.htm
@@ -0,0 +1,34 @@
+<!doctype html>
+<html>
+  <head>
+    <title>XMLHttpRequest: members during network errors (sync)</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#infrastructure-for-the-send()-method" data-tested-assertations="following::dl[1]/dt[2] following::dl[1]/dd[2]/p[1]" />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#network-error" data-tested-assertations=".." />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#request-error" data-tested-assertations="following::ol[1]/li[5]" />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-status-attribute" data-tested-assertations="following::ol[1]/li[1] following::ol[1]/li[2]" />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-statustext-attribute" data-tested-assertations="following::ol[1]/li[1] following::ol[1]/li[2]" />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-getresponseheader()-method" data-tested-assertations="following::ol[1]/li[1] following::ol[1]/li[2]" />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-getallresponseheaders()-method" data-tested-assertations="following::ol[1]/li[1] following::ol[1]/li[2]" />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-responsetext-attribute" data-tested-assertations="following::ol[1]/li[2] following::ol[1]/li[3]" />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-responsexml-attribute" data-tested-assertations="following::ol[1]/li[2] following::ol[1]/li[3]" />
+  </head>
+  <body>
+    <div id="log"></div>
+    <script>
+      test(function() {
+        var client = new XMLHttpRequest()
+        client.open("GET", "resources/infinite-redirects.py", false)
+        assert_throws_dom("NetworkError", function() { client.send(null) }, "send")
+        assert_equals(client.status, 0, "status")
+        assert_equals(client.statusText, "", "statusText")
+        assert_equals(client.getAllResponseHeaders(), "", "getAllResponseHeaders")
+        assert_equals(client.getResponseHeader("content-type"), null, "getResponseHeader")
+        assert_equals(client.responseText, "", "responseText")
+        assert_equals(client.responseXML, null, "responseXML")
+        assert_equals(client.readyState, client.DONE, "readyState")
+      })
+    </script>
+  </body>
+</html>
diff --git a/test/wpt/tests/xhr/xmlhttprequest-network-error.htm b/test/wpt/tests/xhr/xmlhttprequest-network-error.htm
new file mode 100644
index 00000000000..c8e32008095
--- /dev/null
+++ b/test/wpt/tests/xhr/xmlhttprequest-network-error.htm
@@ -0,0 +1,39 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>XMLHttpRequest: members during network errors</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#infrastructure-for-the-send()-method" data-tested-assertations="following::dl[1]/dt[2] following::dl[1]/dd[2]/ol/li[1] following::dl[1]/dd[2]/ol/li[2]" />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-status-attribute" data-tested-assertations="following::ol[1]/li[1] following::ol[1]/li[2]" />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-statustext-attribute" data-tested-assertations="following::ol[1]/li[1] following::ol[1]/li[2]" />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-getresponseheader()-method" data-tested-assertations="following::ol[1]/li[1] following::ol[1]/li[2]" />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-getallresponseheaders()-method" data-tested-assertations="following::ol[1]/li[1] following::ol[1]/li[2]" />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-responsetext-attribute" data-tested-assertations="following::ol[1]/li[2] following::ol[1]/li[3]" />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-responsexml-attribute" data-tested-assertations="following::ol[1]/li[2] following::ol[1]/li[3]" />
+
+  </head>
+  <body>
+    <div id="log"></div>
+    <script>
+      var test = async_test()
+      test.step(function() {
+        var client = new XMLHttpRequest()
+        client.onreadystatechange = function() {
+          test.step(function() {
+            assert_equals(client.status, 0, "status")
+            assert_equals(client.statusText, "", "statusText")
+            assert_equals(client.getAllResponseHeaders(), "", "getAllResponseHeaders")
+            assert_equals(client.getResponseHeader("content-type"), null, "getResponseHeader")
+            assert_equals(client.responseText, "", "responseText")
+            assert_equals(client.responseXML, null, "responseXML")
+            if(client.readyState == 4)
+              test.done()
+          })
+        }
+        client.open("GET", "resources/infinite-redirects.py")
+        client.send(null)
+      })
+  </script>
+ </body>
+</html>
diff --git a/test/wpt/tests/xhr/xmlhttprequest-sync-block-defer-scripts-subframe.html b/test/wpt/tests/xhr/xmlhttprequest-sync-block-defer-scripts-subframe.html
new file mode 100644
index 00000000000..be46a12b6f7
--- /dev/null
+++ b/test/wpt/tests/xhr/xmlhttprequest-sync-block-defer-scripts-subframe.html
@@ -0,0 +1,17 @@
+<!DOCTYPE html>
+<script>
+  var x = 0;
+</script>
+<!-- This script's URI is:
+  var xhr = new XMLHttpRequest();
+  xhr.open('GET', 'data:text/plain,aaa', false);
+  xhr.send();
+  x=1;
+  -->
+<script defer src="data:application/javascript,var%20x%20=%200;%20var%20xhr%20=%20new%20XMLHttpRequest();%20xhr.open('GET',%20'data:text/plain,aaa',%20false);%20xhr.send();%20x=1"></script>
+
+<!-- This script's URI is:
+  parent.postMessage(x, '*');
+-->
+<script defer src="data:application/javascript,parent.postMessage(x, '*');"></script>
+
diff --git a/test/wpt/tests/xhr/xmlhttprequest-sync-block-defer-scripts.html b/test/wpt/tests/xhr/xmlhttprequest-sync-block-defer-scripts.html
new file mode 100644
index 00000000000..0aabdd4b346
--- /dev/null
+++ b/test/wpt/tests/xhr/xmlhttprequest-sync-block-defer-scripts.html
@@ -0,0 +1,15 @@
+<!doctype html>
+<meta charset=utf-8>
+<title>Check that a sync XHR in a defer script blocks later defer scripts from running</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<!--
+  We run the test in a subframe, because something in the testharness stuff
+  interferes with defer scripts -->
+<script>
+  var t = async_test();
+  onmessage = t.step_func_done(function(e) {
+    assert_equals(e.data, 1);
+  });
+</script>
+<iframe src="xmlhttprequest-sync-block-defer-scripts-subframe.html"></iframe>
diff --git a/test/wpt/tests/xhr/xmlhttprequest-sync-block-scripts.html b/test/wpt/tests/xhr/xmlhttprequest-sync-block-scripts.html
new file mode 100644
index 00000000000..d6714ac754e
--- /dev/null
+++ b/test/wpt/tests/xhr/xmlhttprequest-sync-block-scripts.html
@@ -0,0 +1,22 @@
+<!doctype html>
+<meta charset=utf-8>
+<title>Check that while a sync XHR is in flight async script loads don't complete and run script</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<body>
+<script>
+var scriptRan = false;
+var onloadFired = false;
+test(function() {
+  var s = document.createElement("script");
+  s.src = "data:application/javascript,scriptRan = true;";
+  s.onload = function() { onloadFired = true; }
+  document.body.appendChild(s);
+  var xhr = new XMLHttpRequest();
+  xhr.open("GET", "data:,", false);
+  xhr.send();
+  assert_false(scriptRan, "Script should not have run");
+  assert_false(onloadFired, "load event for <script> should not have fired");
+});
+</script>
+</body>
diff --git a/test/wpt/tests/xhr/xmlhttprequest-sync-default-feature-policy.sub.html b/test/wpt/tests/xhr/xmlhttprequest-sync-default-feature-policy.sub.html
new file mode 100644
index 00000000000..ab5b78b77c6
--- /dev/null
+++ b/test/wpt/tests/xhr/xmlhttprequest-sync-default-feature-policy.sub.html
@@ -0,0 +1,32 @@
+<!DOCTYPE html>
+<body>
+  <meta charset="utf-8">
+  <title>Synchronous XMLHttpRequest Feature Policy Test</title>
+  <script src=/resources/testharness.js></script>
+  <script src=/resources/testharnessreport.js></script>
+  <script src=/feature-policy/resources/featurepolicy.js></script>
+  <script src=util/utils.js></script>
+  <script>
+  'use strict';
+  run_all_fp_tests_allow_all(
+      'http://{{hosts[alt][]}}:{{ports[http][0]}}',
+      'sync-xhr',
+      'NetworkError',
+      () => {
+        return new Promise((resolve, reject) => {
+          try {
+            var xhr = new XMLHttpRequest();
+            xhr.open("GET", "data:,", false);
+            try {
+              xhr.send();
+            } catch(e) {
+              reject(e);
+            }
+          } catch(e) {
+            reject({"name": "UnexpectedException:" + e.name});
+          }
+          resolve();
+       });
+      });
+  </script>
+</body>
diff --git a/test/wpt/tests/xhr/xmlhttprequest-sync-not-hang-scriptloader-subframe.html b/test/wpt/tests/xhr/xmlhttprequest-sync-not-hang-scriptloader-subframe.html
new file mode 100644
index 00000000000..aeff2af97c8
--- /dev/null
+++ b/test/wpt/tests/xhr/xmlhttprequest-sync-not-hang-scriptloader-subframe.html
@@ -0,0 +1,17 @@
+<!DOCTYPE html>
+<script>
+  function secondScriptRan() {
+    parent.postMessage("done", "*");
+  }
+
+  function createSecondScript() {
+      var script = document.createElement("script");
+      script.src = "data:application/javascript,secondScriptRan()";
+      document.head.appendChild(script);
+
+      var xhr = new XMLHttpRequest();
+      xhr.open("GET", "data:,", false);
+      xhr.send();
+  }
+</script>
+<script src="data:application/javascript,createSecondScript()" defer></script>
diff --git a/test/wpt/tests/xhr/xmlhttprequest-sync-not-hang-scriptloader.html b/test/wpt/tests/xhr/xmlhttprequest-sync-not-hang-scriptloader.html
new file mode 100644
index 00000000000..bbec1eddcd8
--- /dev/null
+++ b/test/wpt/tests/xhr/xmlhttprequest-sync-not-hang-scriptloader.html
@@ -0,0 +1,16 @@
+<!doctype html>
+<meta charset=utf-8>
+<title>Ensure that an async script added during a defer script that then does a
+  sync XHR still runs</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<!--
+  We run the test in a subframe, because something in the testharness stuff
+  interferes with defer scripts -->
+<script>
+  var t = async_test();
+  onmessage = t.step_func_done(function(e) {
+    assert_equals(e.data, "done");
+  });
+</script>
+<iframe src="xmlhttprequest-sync-not-hang-scriptloader-subframe.html"></iframe>
diff --git a/test/wpt/tests/xhr/xmlhttprequest-timeout-aborted.html b/test/wpt/tests/xhr/xmlhttprequest-timeout-aborted.html
new file mode 100644
index 00000000000..199899c0ab6
--- /dev/null
+++ b/test/wpt/tests/xhr/xmlhttprequest-timeout-aborted.html
@@ -0,0 +1,29 @@
+ <!DOCTYPE html>
+<html>
+<head>
+    <meta charset="utf-8" />
+    <title>XHR2 Timeout Property Tests</title>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-abort()-method" data-tested-assertations="following-sibling::ol/li[4] following-sibling::ol/li[4]/ol/li[5]" />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-timeout-attribute" data-tested-assertations="following-sibling::ol/li[2]" />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#abort-error" data-tested-assertations=".."/>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#event-xhr-abort" data-tested-assertations="../.." />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#timeout-error" data-tested-assertations=".."/>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#event-xhr-timeout" data-tested-assertations="../.." />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#request-error" data-tested-assertations="following::ol/li[9]"/>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#infrastructure-for-the-send()-method" data-tested-assertations="following-sibling::dl//code[contains(@title,'dom-XMLHttpRequest-timeout')]/.. following-sibling::dl//code[contains(@title,'dom-XMLHttpRequest-timeout')]/../following-sibling::dd following::dt[1] following::dd[1]" />
+    <meta name=timeout content=long>
+    <meta name=variant content="?only open()ed, not aborted">
+    <meta name=variant content="?aborted immediately after send()">
+    <meta name=variant content="?call abort() after TIME_NORMAL_LOAD">
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <script src="resources/xmlhttprequest-timeout.js"></script>
+    <script src="resources/xmlhttprequest-timeout-runner.js"></script>
+</head>
+<body>
+    <h1>Description</h1>
+    <p>This test validates that the XHR2 timeout property behaves as expected in async cases in document (i.e. non-worker) context.</p>
+    <div id="log"></div>
+    <script src="resources/xmlhttprequest-timeout-aborted.js" type="text/javascript"></script>
+</body>
+</html>
diff --git a/test/wpt/tests/xhr/xmlhttprequest-timeout-abortedonmain.html b/test/wpt/tests/xhr/xmlhttprequest-timeout-abortedonmain.html
new file mode 100644
index 00000000000..1dfe595a8b1
--- /dev/null
+++ b/test/wpt/tests/xhr/xmlhttprequest-timeout-abortedonmain.html
@@ -0,0 +1,25 @@
+ <!DOCTYPE html>
+<html>
+<head>
+    <meta charset="utf-8" />
+    <title>XHR2 Timeout Property Tests</title>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-abort()-method" data-tested-assertations="following-sibling::ol/li[4] following-sibling::ol/li[4]/ol/li[5]" />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#abort-error" data-tested-assertations=".."/>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#event-xhr-abort" data-tested-assertations="../.." />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#request-error" data-tested-assertations="following::ol/li[9]"/>
+    <meta name=timeout content=long>
+    <meta name=variant content="?abort() from a 0ms timeout">
+    <meta name=variant content="?aborted after TIME_DELAY">
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <script src="resources/xmlhttprequest-timeout.js"></script>
+    <script src="resources/xmlhttprequest-timeout-runner.js"></script>
+</head>
+<body>
+    <h1>Description</h1>
+    <p>This test validates that the XHR2 timeout property behaves as expected in async cases in document (i.e. non-worker) context.</p>
+    <div id="log"></div>
+    <script src="resources/xmlhttprequest-timeout-abortedonmain.js" type="text/javascript"></script>
+</body>
+</html>
+
diff --git a/test/wpt/tests/xhr/xmlhttprequest-timeout-overrides.html b/test/wpt/tests/xhr/xmlhttprequest-timeout-overrides.html
new file mode 100644
index 00000000000..afebfe7bc45
--- /dev/null
+++ b/test/wpt/tests/xhr/xmlhttprequest-timeout-overrides.html
@@ -0,0 +1,26 @@
+ <!DOCTYPE html>
+<html>
+<head>
+    <meta charset="utf-8" />
+    <title>XHR2 Timeout Property Tests</title>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-timeout-attribute" data-tested-assertations="following::ol[1]/li[2]" />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#handler-xhr-ontimeout" data-tested-assertations="../.."/>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#timeout-error" data-tested-assertations=".."/>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#request-error" data-tested-assertations="following::ol[1]/li[9]"/>
+    <meta name=timeout content=long>
+    <meta name=variant content="?timeout disabled after initially set">
+    <meta name=variant content="?timeout overrides load after a delay">
+    <meta name=variant content="?timeout enabled after initially disabled">
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <script src="resources/xmlhttprequest-timeout.js"></script>
+    <script src="resources/xmlhttprequest-timeout-runner.js"></script>
+</head>
+<body>
+    <h1>Description</h1>
+    <p>This test validates that the XHR2 timeout property behaves as expected in async cases in document (i.e. non-worker) context.</p>
+    <div id="log"></div>
+    <script src="resources/xmlhttprequest-timeout-overrides.js"></script>
+</body>
+</html>
+
diff --git a/test/wpt/tests/xhr/xmlhttprequest-timeout-overridesexpires.html b/test/wpt/tests/xhr/xmlhttprequest-timeout-overridesexpires.html
new file mode 100644
index 00000000000..b7085939761
--- /dev/null
+++ b/test/wpt/tests/xhr/xmlhttprequest-timeout-overridesexpires.html
@@ -0,0 +1,26 @@
+ <!DOCTYPE html>
+<html>
+<head>
+    <meta charset="utf-8" />
+    <title>XHR2 Timeout Property Tests</title>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-timeout-attribute" data-tested-assertations="following::ol[1]/li[2]" />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#handler-xhr-ontimeout" data-tested-assertations="../.."/>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#timeout-error" data-tested-assertations=".."/>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#request-error" data-tested-assertations="following::ol[1]/li[9]"/>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#infrastructure-for-the-send()-method" data-tested-assertations="following-sibling::dl//code[contains(@title,'dom-XMLHttpRequest-timeout')]/.. following-sibling::dl//code[contains(@title,'dom-XMLHttpRequest-timeout')]/../following-sibling::dd following::dt[1] following::dd[1]" />
+    <meta name=timeout content=long>
+    <meta name=variant content="?timeout set to expiring value after load fires">
+    <meta name=variant content="?timeout set to expired value before load fires">
+    <meta name=variant content="?timeout set to non-expiring value after timeout fires">
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <script src="resources/xmlhttprequest-timeout.js"></script>
+    <script src="resources/xmlhttprequest-timeout-runner.js"></script>
+</head>
+<body>
+    <h1>Description</h1>
+    <p>This test validates that the XHR2 timeout property behaves as expected in async cases in document (i.e. non-worker) context.</p>
+    <div id="log"></div>
+    <script src="resources/xmlhttprequest-timeout-overridesexpires.js" type="text/javascript"></script>
+</body>
+</html>
diff --git a/test/wpt/tests/xhr/xmlhttprequest-timeout-reused.html b/test/wpt/tests/xhr/xmlhttprequest-timeout-reused.html
new file mode 100644
index 00000000000..48a98932ca3
--- /dev/null
+++ b/test/wpt/tests/xhr/xmlhttprequest-timeout-reused.html
@@ -0,0 +1,49 @@
+ <!DOCTYPE html>
+<html>
+<head>
+    <meta charset="utf-8" />
+    <title>XHR2 Timeout Property Tests</title>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#timeout-error" />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-timeout-attribute" data-tested-assertations="following::ol[1]/li[2]" />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#handler-xhr-ontimeout" data-tested-assertations="../.."/>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#timeout-error" data-tested-assertations=".."/>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#request-error" data-tested-assertations="following::ol[1]/li[9]"/>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#infrastructure-for-the-send()-method" data-tested-assertations="following-sibling::dl//code[contains(@title,'dom-XMLHttpRequest-timeout')]/.. following-sibling::dl//code[contains(@title,'dom-XMLHttpRequest-timeout')]/../following-sibling::dd following::dt[1] following::dd[1]" />
+    <meta name=timeout content=long>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+</head>
+<body>
+    <div id="log"></div>
+    <script type="text/javascript">
+
+var test = async_test();
+
+function startRequest() {
+    xhr.open("GET", "./resources/content.py?content=Hi", true);
+    xhr.timeout = 2000;
+    test.step_timeout(function () {
+      xhr.send();
+    }, 1000);
+}
+
+test.step(function()
+{
+    var count = 0;
+    xhr = new XMLHttpRequest();
+    xhr.onload = function () {
+        assert_equals(xhr.response, "Hi");
+        if (++count == 2) {
+            test.done();
+        }
+    }
+    xhr.ontimeout = function () {
+      assert_unreached("HTTP error should not timeout");
+    }
+    startRequest();
+    test.step_timeout(startRequest, 3500);
+});
+
+    </script>
+</body>
+</html>
diff --git a/test/wpt/tests/xhr/xmlhttprequest-timeout-simple.html b/test/wpt/tests/xhr/xmlhttprequest-timeout-simple.html
new file mode 100644
index 00000000000..ac8984ff449
--- /dev/null
+++ b/test/wpt/tests/xhr/xmlhttprequest-timeout-simple.html
@@ -0,0 +1,27 @@
+ <!DOCTYPE html>
+<html>
+<head>
+    <meta charset="utf-8" />
+    <title>XHR2 Timeout Property Tests</title>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-timeout-attribute" data-tested-assertations="following::ol[1]/li[2]" />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#handler-xhr-ontimeout" data-tested-assertations="../.."/>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#timeout-error" data-tested-assertations=".."/>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#request-error" data-tested-assertations="following::ol[1]/li[9]"/>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#infrastructure-for-the-send()-method" data-tested-assertations="following-sibling::dl//code[contains(@title,'dom-XMLHttpRequest-timeout')]/.. following-sibling::dl//code[contains(@title,'dom-XMLHttpRequest-timeout')]/../following-sibling::dd following::dt[1] following::dd[1]" />
+    <meta name=timeout content=long>
+    <meta name=variant content="?no time out scheduled, load fires normally">
+    <meta name=variant content="?load fires normally">
+    <meta name=variant content="?timeout hit before load">
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <script src="resources/xmlhttprequest-timeout.js"></script>
+    <script src="resources/xmlhttprequest-timeout-runner.js"></script>
+</head>
+<body>
+    <h1>Description</h1>
+    <p>This test validates that the XHR2 timeout property behaves as expected in async cases in document (i.e. non-worker) context.</p>
+    <div id="log"></div>
+    <script src="resources/xmlhttprequest-timeout-simple.js"></script>
+</body>
+</html>
+
diff --git a/test/wpt/tests/xhr/xmlhttprequest-timeout-synconmain.html b/test/wpt/tests/xhr/xmlhttprequest-timeout-synconmain.html
new file mode 100644
index 00000000000..eb9ecb75a04
--- /dev/null
+++ b/test/wpt/tests/xhr/xmlhttprequest-timeout-synconmain.html
@@ -0,0 +1,23 @@
+ <!DOCTYPE html>
+<html>
+<head>
+    <meta charset="utf-8" />
+    <title>XHR2 Timeout Property Tests</title>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-timeout-attribute" data-tested-assertations="following::ol[1]/li[1]" />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-open()-method" data-tested-assertations="following::ol[1]/li[10]" />
+    <meta name=timeout content=long>
+    <meta name=variant content="?timeout after open">
+    <meta name=variant content="?timeout before open">
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <script src="resources/xmlhttprequest-timeout.js"></script>
+    <script src="resources/xmlhttprequest-timeout-runner.js"></script>
+</head>
+<body>
+    <h1>Description</h1>
+    <p>This test validates that the XHR2 timeout property behaves as expected in async cases in document (i.e. non-worker) context.</p>
+    <div id="log"></div>
+    <script src="resources/xmlhttprequest-timeout-synconmain.js" type="text/javascript"></script>
+</body>
+</html>
+
diff --git a/test/wpt/tests/xhr/xmlhttprequest-timeout-twice.html b/test/wpt/tests/xhr/xmlhttprequest-timeout-twice.html
new file mode 100644
index 00000000000..ce3b10b7372
--- /dev/null
+++ b/test/wpt/tests/xhr/xmlhttprequest-timeout-twice.html
@@ -0,0 +1,28 @@
+ <!DOCTYPE html>
+<html>
+<head>
+    <meta charset="utf-8" />
+    <title>XHR2 Timeout Property Tests</title>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#timeout-error" />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-timeout-attribute" data-tested-assertations="following::ol[1]/li[2]" />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#handler-xhr-ontimeout" data-tested-assertations="../.."/>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#timeout-error" data-tested-assertations=".."/>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#request-error" data-tested-assertations="following::ol[1]/li[9]"/>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#infrastructure-for-the-send()-method" data-tested-assertations="following-sibling::dl//code[contains(@title,'dom-XMLHttpRequest-timeout')]/.. following-sibling::dl//code[contains(@title,'dom-XMLHttpRequest-timeout')]/../following-sibling::dd following::dt[1] following::dd[1]" />
+    <meta name=timeout content=long>
+    <meta name=variant content="?load fires normally with no timeout set, twice">
+    <meta name=variant content="?load fires normally with same timeout set twice">
+    <meta name=variant content="?timeout fires normally with same timeout set twice">
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <script src="resources/xmlhttprequest-timeout.js"></script>
+    <script src="resources/xmlhttprequest-timeout-runner.js"></script>
+</head>
+<body>
+    <h1>Description</h1>
+    <p>This test validates that the XHR2 timeout property behaves as expected in async cases in document (i.e. non-worker) context.</p>
+    <div id="log"></div>
+    <script src="resources/xmlhttprequest-timeout-twice.js" type="text/javascript"></script>
+</body>
+</html>
+
diff --git a/test/wpt/tests/xhr/xmlhttprequest-timeout-worker-aborted.html b/test/wpt/tests/xhr/xmlhttprequest-timeout-worker-aborted.html
new file mode 100644
index 00000000000..91fdab37d12
--- /dev/null
+++ b/test/wpt/tests/xhr/xmlhttprequest-timeout-worker-aborted.html
@@ -0,0 +1,31 @@
+ <!DOCTYPE html>
+<html>
+<head>
+    <meta charset="utf-8" />
+    <title>XHR2 Timeout Property Tests in Worker</title>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-abort()-method" data-tested-assertations="following-sibling::ol/li[4] following-sibling::ol/li[4]/ol/li[5]" />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-timeout-attribute" data-tested-assertations="following-sibling::ol/li[2]" />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#abort-error" data-tested-assertations=".."/>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#event-xhr-abort" data-tested-assertations="../.." />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#timeout-error" data-tested-assertations=".."/>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#event-xhr-timeout" data-tested-assertations="../.." />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#request-error" data-tested-assertations="following::ol/li[9]"/>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#infrastructure-for-the-send()-method" data-tested-assertations="following-sibling::dl//code[contains(@title,'dom-XMLHttpRequest-timeout')]/.. following-sibling::dl//code[contains(@title,'dom-XMLHttpRequest-timeout')]/../following-sibling::dd following::dt[1] following::dd[1]" />
+    <meta name=timeout content=long>
+    <meta name=variant content="?only open()ed, not aborted">
+    <meta name=variant content="?aborted immediately after send()">
+    <meta name=variant content="?call abort() after TIME_NORMAL_LOAD">
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <script src="resources/xmlhttprequest-timeout-runner.js"></script>
+</head>
+<body>
+    <h1>Description</h1>
+    <p>This test validates that the XHR2 timeout property behaves as expected in in a worker context.</p>
+    <div id="log"></div>
+    <script type="text/javascript">
+        var worker = new Worker("resources/xmlhttprequest-timeout-aborted.js");
+        worker.addEventListener("message", testResultCallbackHandler);
+    </script>
+</body>
+</html>
diff --git a/test/wpt/tests/xhr/xmlhttprequest-timeout-worker-overrides.html b/test/wpt/tests/xhr/xmlhttprequest-timeout-worker-overrides.html
new file mode 100644
index 00000000000..b2ad95287bb
--- /dev/null
+++ b/test/wpt/tests/xhr/xmlhttprequest-timeout-worker-overrides.html
@@ -0,0 +1,27 @@
+ <!DOCTYPE html>
+<html>
+<head>
+    <meta charset="utf-8" />
+    <title>XHR2 Timeout Property Tests in Worker</title>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-timeout-attribute" data-tested-assertations="following::ol[1]/li[2]" />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#handler-xhr-ontimeout" data-tested-assertations="../.."/>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#timeout-error" data-tested-assertations=".."/>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#request-error" data-tested-assertations="following::ol[1]/li[9]"/>
+    <meta name=timeout content=long>
+    <meta name=variant content="?timeout disabled after initially set">
+    <meta name=variant content="?timeout overrides load after a delay">
+    <meta name=variant content="?timeout enabled after initially disabled">
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <script src="resources/xmlhttprequest-timeout-runner.js"></script>
+</head>
+<body>
+    <h1>Description</h1>
+    <p>This test validates that the XHR2 timeout property behaves as expected in in a worker context.</p>
+    <div id="log"></div>
+    <script type="text/javascript">
+        var worker = new Worker("resources/xmlhttprequest-timeout-overrides.js" + location.search);
+        worker.addEventListener("message", testResultCallbackHandler);
+    </script>
+</body>
+</html>
diff --git a/test/wpt/tests/xhr/xmlhttprequest-timeout-worker-overridesexpires.html b/test/wpt/tests/xhr/xmlhttprequest-timeout-worker-overridesexpires.html
new file mode 100644
index 00000000000..07a8656dbe3
--- /dev/null
+++ b/test/wpt/tests/xhr/xmlhttprequest-timeout-worker-overridesexpires.html
@@ -0,0 +1,28 @@
+ <!DOCTYPE html>
+<html>
+<head>
+    <meta charset="utf-8" />
+    <title>XHR2 Timeout Property Tests in Worker</title>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-timeout-attribute" data-tested-assertations="following::ol[1]/li[2]" />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#handler-xhr-ontimeout" data-tested-assertations="../.."/>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#timeout-error" data-tested-assertations=".."/>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#request-error" data-tested-assertations="following::ol[1]/li[9]"/>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#infrastructure-for-the-send()-method" data-tested-assertations="following-sibling::dl//code[contains(@title,'dom-XMLHttpRequest-timeout')]/.. following-sibling::dl//code[contains(@title,'dom-XMLHttpRequest-timeout')]/../following-sibling::dd following::dt[1] following::dd[1]" />
+    <meta name=timeout content=long>
+    <meta name=variant content="?timeout set to expiring value after load fires">
+    <meta name=variant content="?timeout set to expired value before load fires">
+    <meta name=variant content="?timeout set to non-expiring value after timeout fires">
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <script src="resources/xmlhttprequest-timeout-runner.js"></script>
+</head>
+<body>
+    <h1>Description</h1>
+    <p>This test validates that the XHR2 timeout property behaves as expected in in a worker context.</p>
+    <div id="log"></div>
+    <script type="text/javascript">
+        var worker = new Worker("resources/xmlhttprequest-timeout-overridesexpires.js");
+        worker.addEventListener("message", testResultCallbackHandler);
+    </script>
+</body>
+</html>
diff --git a/test/wpt/tests/xhr/xmlhttprequest-timeout-worker-simple.html b/test/wpt/tests/xhr/xmlhttprequest-timeout-worker-simple.html
new file mode 100644
index 00000000000..fa5c899579d
--- /dev/null
+++ b/test/wpt/tests/xhr/xmlhttprequest-timeout-worker-simple.html
@@ -0,0 +1,29 @@
+ <!DOCTYPE html>
+<html>
+<head>
+    <meta charset="utf-8" />
+    <title>XHR2 Timeout Property Tests in Worker</title>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-timeout-attribute" data-tested-assertations="following::ol[1]/li[2]" />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#handler-xhr-ontimeout" data-tested-assertations="../.."/>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#timeout-error" data-tested-assertations=".."/>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#request-error" data-tested-assertations="following::ol[1]/li[9]"/>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#infrastructure-for-the-send()-method" data-tested-assertations="following-sibling::dl//code[contains(@title,'dom-XMLHttpRequest-timeout')]/.. following-sibling::dl//code[contains(@title,'dom-XMLHttpRequest-timeout')]/../following-sibling::dd following::dt[1] following::dd[1]" />
+    <meta name=timeout content=long>
+    <meta name=variant content="?no time out scheduled, load fires normally">
+    <meta name=variant content="?load fires normally">
+    <meta name=variant content="?timeout hit before load">
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <script src="resources/xmlhttprequest-timeout-runner.js"></script>
+</head>
+<body>
+    <h1>Description</h1>
+    <p>This test validates that the XHR2 timeout property behaves as expected in in a worker context.</p>
+    <div id="log"></div>
+    <script type="text/javascript">
+        var worker = new Worker("resources/xmlhttprequest-timeout-simple.js" + location.search);
+        worker.onmessage = testResultCallbackHandler;
+    </script>
+</body>
+</html>
+
diff --git a/test/wpt/tests/xhr/xmlhttprequest-timeout-worker-synconworker.html b/test/wpt/tests/xhr/xmlhttprequest-timeout-worker-synconworker.html
new file mode 100644
index 00000000000..187db12a65f
--- /dev/null
+++ b/test/wpt/tests/xhr/xmlhttprequest-timeout-worker-synconworker.html
@@ -0,0 +1,28 @@
+ <!DOCTYPE html>
+<html>
+<head>
+    <meta charset="utf-8" />
+    <title>XHR2 Timeout Property Tests in Worker</title>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-timeout-attribute" data-tested-assertations="following::ol[1]/li[2]" />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#handler-xhr-ontimeout" data-tested-assertations="../.."/>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#timeout-error" data-tested-assertations=".."/>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#request-error" data-tested-assertations="following::ol[1]/li[9]"/>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#infrastructure-for-the-send()-method" data-tested-assertations="following-sibling::dl//code[contains(@title,'dom-XMLHttpRequest-timeout')]/.. following-sibling::dl//code[contains(@title,'dom-XMLHttpRequest-timeout')]/../following-sibling::dd following::dt[1] following::dd[1]" />
+    <meta name=timeout content=long>
+    <meta name=variant content="?no time out scheduled, load fires normally">
+    <meta name=variant content="?load fires normally">
+    <meta name=variant content="?timeout hit before load">
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <script src="resources/xmlhttprequest-timeout-runner.js"></script>
+</head>
+<body>
+    <h1>Description</h1>
+    <p>This test validates that the XHR2 timeout property behaves as expected in in a worker context.</p>
+    <div id="log"></div>
+    <script type="text/javascript">
+        var worker = new Worker("resources/xmlhttprequest-timeout-synconworker.js" + location.search);
+        worker.addEventListener("message", testResultCallbackHandler);
+    </script>
+</body>
+</html>
diff --git a/test/wpt/tests/xhr/xmlhttprequest-timeout-worker-twice.html b/test/wpt/tests/xhr/xmlhttprequest-timeout-worker-twice.html
new file mode 100644
index 00000000000..f9ad25a50b0
--- /dev/null
+++ b/test/wpt/tests/xhr/xmlhttprequest-timeout-worker-twice.html
@@ -0,0 +1,29 @@
+ <!DOCTYPE html>
+<html>
+<head>
+    <meta charset="utf-8" />
+    <title>XHR2 Timeout Property Tests in Worker</title>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-timeout-attribute" data-tested-assertations="following::ol[1]/li[2]" />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#handler-xhr-ontimeout" data-tested-assertations="../.."/>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#timeout-error" data-tested-assertations=".."/>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#request-error" data-tested-assertations="following::ol[1]/li[9]"/>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#infrastructure-for-the-send()-method" data-tested-assertations="following-sibling::dl//code[contains(@title,'dom-XMLHttpRequest-timeout')]/.. following-sibling::dl//code[contains(@title,'dom-XMLHttpRequest-timeout')]/../following-sibling::dd following::dt[1] following::dd[1]" />
+    <meta name=timeout content=long>
+    <meta name=variant content="?load fires normally with no timeout set, twice">
+    <meta name=variant content="?load fires normally with same timeout set twice">
+    <meta name=variant content="?timeout fires normally with same timeout set twice">
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <script src="resources/xmlhttprequest-timeout-runner.js"></script>
+</head>
+<body>
+    <h1>Description</h1>
+    <p>This test validates that the XHR2 timeout property behaves as expected in in a worker context.</p>
+    <div id="log"></div>
+    <script type="text/javascript">
+        var worker = new Worker("resources/xmlhttprequest-timeout-twice.js" + location.search);
+        worker.addEventListener("message", testResultCallbackHandler);
+    </script>
+</body>
+</html>
+
diff --git a/test/wpt/tests/xhr/xmlhttprequest-unsent.htm b/test/wpt/tests/xhr/xmlhttprequest-unsent.htm
new file mode 100644
index 00000000000..82282b0163e
--- /dev/null
+++ b/test/wpt/tests/xhr/xmlhttprequest-unsent.htm
@@ -0,0 +1,36 @@
+<!doctype html>
+<html>
+  <head>
+    <title>XMLHttpRequest: members during UNSENT</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <link rel="help" href="https://xhr.spec.whatwg.org/#dom-xmlhttprequest-unsent" data-tested-assertations=".. following::dd" />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#dom-xmlhttprequest-setrequestheader" data-tested-assertations="following::ol/li[1]" />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-send()-method" data-tested-assertations="following::ol/li[1]" />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-status-attribute" data-tested-assertations="following::ol/li[1]" />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-statustext-attribute" data-tested-assertations="following::ol/li[1]" />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-getresponseheader()-method" data-tested-assertations="following::ol/li[1]" />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-getallresponseheaders()-method" data-tested-assertations="following::ol/li[1]" />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-responsetext-attribute" data-tested-assertations="following::ol/li[2]" />
+    <link rel="help" href="https://xhr.spec.whatwg.org/#the-responsexml-attribute" data-tested-assertations="following::ol/li[2]" />
+
+  </head>
+  <body>
+    <div id="log"></div>
+    <script>
+      test(function() {
+        var client = new XMLHttpRequest()
+        assert_throws_dom("InvalidStateError", function() { client.setRequestHeader("x-test", "test") }, "setRequestHeader")
+        assert_throws_dom("InvalidStateError", function() { client.send(null) }, "send")
+        assert_equals(client.status, 0, "status")
+        assert_equals(client.statusText, "", "statusText")
+        assert_equals(client.getAllResponseHeaders(), "", "getAllResponseHeaders")
+        assert_equals(client.getResponseHeader("x-test"), null, "getResponseHeader")
+        assert_equals(client.responseText, "", "responseText")
+        assert_equals(client.responseXML, null, "responseXML")
+
+        assert_equals(client.readyState, client.UNSENT, "readyState")
+      })
+    </script>
+  </body>
+</html>
diff --git a/types/balanced-pool.d.ts b/types/balanced-pool.d.ts
index b5de726eeca..d1e9375875f 100644
--- a/types/balanced-pool.d.ts
+++ b/types/balanced-pool.d.ts
@@ -5,10 +5,10 @@ import { URL } from 'url'
 export default BalancedPool
 
 declare class BalancedPool extends Dispatcher {
-  constructor(url: string | URL | string[], options?: Pool.Options);
+  constructor(url: string | string[] | URL | URL[], options?: Pool.Options);
 
-  addUpstream(upstream: string): BalancedPool;
-  removeUpstream(upstream: string): BalancedPool;
+  addUpstream(upstream: string | URL): BalancedPool;
+  removeUpstream(upstream: string | URL): BalancedPool;
   upstreams: Array<string>;
 
   /** `true` after `pool.close()` has been called. */
diff --git a/types/client.d.ts b/types/client.d.ts
index 3a954ac83a1..56074a15ae7 100644
--- a/types/client.d.ts
+++ b/types/client.d.ts
@@ -4,10 +4,10 @@ import Dispatcher from './dispatcher'
 import DispatchInterceptor from './dispatcher'
 import buildConnector from "./connector";
 
-export default Client
-
-/** A basic HTTP/1.1 client, mapped on top a single TCP/TLS connection. Pipelining is disabled by default. */
-declare class Client extends Dispatcher {
+/**
+ * A basic HTTP/1.1 client, mapped on top a single TCP/TLS connection. Pipelining is disabled by default.
+ */
+export class Client extends Dispatcher {
   constructor(url: string | URL, options?: Client.Options);
   /** Property to get and set the pipelining factor. */
   pipelining: number;
@@ -17,36 +17,62 @@ declare class Client extends Dispatcher {
   destroyed: boolean;
 }
 
-declare namespace Client {
+export declare namespace Client {
+  export interface OptionsInterceptors {
+    Client: readonly DispatchInterceptor[];
+  }
   export interface Options {
+    /** TODO */
+    interceptors?: OptionsInterceptors;
+    /** The maximum length of request headers in bytes. Default: `16384` (16KiB). */
+    maxHeaderSize?: number;
+    /** The amount of time the parser will wait to receive the complete HTTP headers (Node 14 and above only). Default: `300e3` milliseconds (300s). */
+    headersTimeout?: number;
+    /** @deprecated unsupported socketTimeout, use headersTimeout & bodyTimeout instead */
+    socketTimeout?: never;
+    /** @deprecated unsupported requestTimeout, use headersTimeout & bodyTimeout instead */
+    requestTimeout?: never;
+    /** TODO */
+    connectTimeout?: number;
+    /** The timeout after which a request will time out, in milliseconds. Monitors time between receiving body data. Use `0` to disable it entirely. Default: `300e3` milliseconds (300s). */
+    bodyTimeout?: number;
+    /** @deprecated unsupported idleTimeout, use keepAliveTimeout instead */
+    idleTimeout?: never;
+    /** @deprecated unsupported keepAlive, use pipelining=0 instead */
+    keepAlive?: never;
     /** the timeout after which a socket without active requests will time out. Monitors time between activity on a connected socket. This value may be overridden by *keep-alive* hints from the server. Default: `4e3` milliseconds (4s). */
-    keepAliveTimeout?: number | null;
+    keepAliveTimeout?: number;
+    /** @deprecated unsupported maxKeepAliveTimeout, use keepAliveMaxTimeout instead */
+    maxKeepAliveTimeout?: never;
     /** the maximum allowed `idleTimeout` when overridden by *keep-alive* hints from the server. Default: `600e3` milliseconds (10min). */
-    keepAliveMaxTimeout?: number | null;
+    keepAliveMaxTimeout?: number;
     /** A number subtracted from server *keep-alive* hints when overriding `idleTimeout` to account for timing inaccuracies caused by e.g. transport latency. Default: `1e3` milliseconds (1s). */
-    keepAliveTimeoutThreshold?: number | null;
+    keepAliveTimeoutThreshold?: number;
+    /** TODO */
+    socketPath?: string;
     /** The amount of concurrent requests to be sent over the single TCP/TLS connection according to [RFC7230](https://tools.ietf.org/html/rfc7230#section-6.3.2). Default: `1`. */
-    pipelining?: number | null;
-    /** **/
-    connect?: buildConnector.BuildOptions | buildConnector.connector | null;
-    /** The maximum length of request headers in bytes. Default: `16384` (16KiB). */
-    maxHeaderSize?: number | null;
-    /** The timeout after which a request will time out, in milliseconds. Monitors time between receiving body data. Use `0` to disable it entirely. Default: `30e3` milliseconds (30s). */
-    bodyTimeout?: number | null;
-    /** The amount of time the parser will wait to receive the complete HTTP headers (Node 14 and above only). Default: `30e3` milliseconds (30s). */
-    headersTimeout?: number | null;
+    pipelining?: number;
+    /** @deprecated use the connect option instead */
+    tls?: never;
     /** If `true`, an error is thrown when the request content-length header doesn't match the length of the request body. Default: `true`. */
     strictContentLength?: boolean;
-    /** @deprecated use the connect option instead */
-    tls?: TlsOptions | null;
-    /** */
+    /** TODO */
+    maxCachedSessions?: number;
+    /** TODO */
+    maxRedirections?: number;
+    /** TODO */
+    connect?: buildConnector.BuildOptions | buildConnector.connector;
+    /** TODO */
     maxRequestsPerClient?: number;
+    /** TODO */
+    localAddress?: string;
     /** Max response body size in bytes, -1 is disabled */
-    maxResponseSize?: number | null;
-
-    interceptors?: {Client: readonly DispatchInterceptor[] | undefined}
+    maxResponseSize?: number;
+    /** Enables a family autodetection algorithm that loosely implements section 5 of RFC 8305. */
+    autoSelectFamily?: boolean;
+    /** The amount of time in milliseconds to wait for a connection attempt to finish before trying the next address when using the `autoSelectFamily` option. */
+    autoSelectFamilyAttemptTimeout?: number; 
   }
-
   export interface SocketInfo {
     localAddress?: string
     localPort?: number
@@ -57,6 +83,6 @@ declare namespace Client {
     bytesWritten?: number
     bytesRead?: number
   }
-
-
 }
+
+export default Client;
diff --git a/types/connector.d.ts b/types/connector.d.ts
index 2b28771af2a..d53d7952b5c 100644
--- a/types/connector.d.ts
+++ b/types/connector.d.ts
@@ -10,6 +10,8 @@ declare namespace buildConnector {
     socketPath?: string | null;
     timeout?: number | null;
     port?: number;
+    keepAlive?: boolean | null;
+    keepAliveInitialDelay?: number | null;
   }
 
   export interface Options {
diff --git a/types/content-type.d.ts b/types/content-type.d.ts
new file mode 100644
index 00000000000..f2a87f1b751
--- /dev/null
+++ b/types/content-type.d.ts
@@ -0,0 +1,21 @@
+/// <reference types="node" />
+
+interface MIMEType {
+  type: string
+  subtype: string
+  parameters: Map<string, string>
+  essence: string
+}
+
+/**
+ * Parse a string to a {@link MIMEType} object. Returns `failure` if the string
+ * couldn't be parsed.
+ * @see https://mimesniff.spec.whatwg.org/#parse-a-mime-type
+ */
+export function parseMIMEType (input: string): 'failure' | MIMEType
+
+/**
+ * Convert a MIMEType object to a string.
+ * @see https://mimesniff.spec.whatwg.org/#serialize-a-mime-type
+ */
+export function serializeAMimeType (mimeType: MIMEType): string
diff --git a/types/dispatcher.d.ts b/types/dispatcher.d.ts
index 05a2ab5e76e..c6b0c8875eb 100644
--- a/types/dispatcher.d.ts
+++ b/types/dispatcher.d.ts
@@ -1,8 +1,8 @@
 import { URL } from 'url'
 import { Duplex, Readable, Writable } from 'stream'
 import { EventEmitter } from 'events'
-import { IncomingHttpHeaders } from 'http'
 import { Blob } from 'buffer'
+import { IncomingHttpHeaders } from './header'
 import BodyReadable from './readable'
 import { FormData } from './formdata'
 import Errors from './errors'
@@ -105,11 +105,13 @@ declare namespace Dispatcher {
     query?: Record<string, any>;
     /** Whether the requests can be safely retried or not. If `false` the request won't be sent until all preceding requests in the pipeline have completed. Default: `true` if `method` is `HEAD` or `GET`. */
     idempotent?: boolean;
+    /** Whether the response is expected to take a long time and would end up blocking the pipeline. When this is set to `true` further pipelining will be avoided on the same connection until headers have been received. */
+    blocking?: boolean;
     /** Upgrade the request. Should be used to specify the kind of upgrade i.e. `'Websocket'`. Default: `method === 'CONNECT' || null`. */
     upgrade?: boolean | string | null;
-    /** The amount of time the parser will wait to receive the complete HTTP headers. Defaults to 30 seconds. */
+    /** The amount of time the parser will wait to receive the complete HTTP headers. Defaults to 300 seconds. */
     headersTimeout?: number | null;
-    /** The timeout after which a request will time out, in milliseconds. Monitors time between receiving body data. Use 0 to disable it entirely. Defaults to 30 seconds. */
+    /** The timeout after which a request will time out, in milliseconds. Monitors time between receiving body data. Use 0 to disable it entirely. Defaults to 300 seconds. */
     bodyTimeout?: number | null;
     /** Whether the request should stablish a keep-alive or not. Default `false` */
     reset?: boolean;
diff --git a/types/errors.d.ts b/types/errors.d.ts
index c4ef4b6f633..fd2ce7c3a99 100644
--- a/types/errors.d.ts
+++ b/types/errors.d.ts
@@ -1,4 +1,4 @@
-import {IncomingHttpHeaders} from "http";
+import { IncomingHttpHeaders } from "./header";
 import Client from './client'
 
 export default Errors
@@ -6,12 +6,24 @@ export default Errors
 declare namespace Errors {
   export class UndiciError extends Error { }
 
+  /** Connect timeout error. */
+  export class ConnectTimeoutError extends UndiciError {
+    name: 'ConnectTimeoutError';
+    code: 'UND_ERR_CONNECT_TIMEOUT';
+  }
+
   /** A header exceeds the `headersTimeout` option. */
   export class HeadersTimeoutError extends UndiciError {
     name: 'HeadersTimeoutError';
     code: 'UND_ERR_HEADERS_TIMEOUT';
   }
 
+  /** Headers overflow error. */
+  export class HeadersOverflowError extends UndiciError {
+    name: 'HeadersOverflowError'
+    code: 'UND_ERR_HEADERS_OVERFLOW'
+  }
+
   /** A body exceeds the `bodyTimeout` option. */
   export class BodyTimeoutError extends UndiciError {
     name: 'BodyTimeoutError';
@@ -27,12 +39,6 @@ declare namespace Errors {
     headers: IncomingHttpHeaders | string[] | null;
   }
 
-  /** A socket exceeds the `socketTimeout` option. */
-  export class SocketTimeoutError extends UndiciError {
-    name: 'SocketTimeoutError';
-    code: 'UND_ERR_SOCKET_TIMEOUT';
-  }
-
   /** Passed an invalid argument. */
   export class InvalidArgumentError extends UndiciError {
     name: 'InvalidArgumentError';
@@ -40,14 +46,14 @@ declare namespace Errors {
   }
 
   /** Returned an invalid value. */
-  export class InvalidReturnError extends UndiciError {
-    name: 'InvalidReturnError';
+  export class InvalidReturnValueError extends UndiciError {
+    name: 'InvalidReturnValueError';
     code: 'UND_ERR_INVALID_RETURN_VALUE';
   }
 
   /** The request has been aborted by the user. */
   export class RequestAbortedError extends UndiciError {
-    name: 'RequestAbortedError';
+    name: 'AbortError';
     code: 'UND_ERR_ABORTED';
   }
 
@@ -57,12 +63,18 @@ declare namespace Errors {
     code: 'UND_ERR_INFO';
   }
 
-  /** Body does not match content-length header. */
+  /** Request body length does not match content-length header. */
   export class RequestContentLengthMismatchError extends UndiciError {
     name: 'RequestContentLengthMismatchError';
     code: 'UND_ERR_REQ_CONTENT_LENGTH_MISMATCH';
   }
 
+  /** Response body length does not match content-length header. */
+  export class ResponseContentLengthMismatchError extends UndiciError {
+    name: 'ResponseContentLengthMismatchError';
+    code: 'UND_ERR_RES_CONTENT_LENGTH_MISMATCH';
+  }
+
   /** Trying to use a destroyed client. */
   export class ClientDestroyedError extends UndiciError {
     name: 'ClientDestroyedError';
@@ -88,7 +100,18 @@ declare namespace Errors {
     code: 'UND_ERR_NOT_SUPPORTED';
   }
 
-  /** The response exceed the length allowed */
+  /** No upstream has been added to the BalancedPool. */
+  export class BalancedPoolMissingUpstreamError extends UndiciError {
+    name: 'MissingUpstreamError';
+    code: 'UND_ERR_BPL_MISSING_UPSTREAM';
+  }
+
+  export class HTTPParserError extends UndiciError {
+    name: 'HTTPParserError';
+    code: string;
+  }
+
+  /** The response exceed the length allowed. */
   export class ResponseExceededMaxSizeError extends UndiciError {
     name: 'ResponseExceededMaxSizeError';
     code: 'UND_ERR_RES_EXCEEDED_MAX_SIZE';
diff --git a/types/fetch.d.ts b/types/fetch.d.ts
index 58bd4d2a769..fa4619c9182 100644
--- a/types/fetch.d.ts
+++ b/types/fetch.d.ts
@@ -59,6 +59,7 @@ export declare class Headers implements SpecIterable<[string, string]> {
   readonly get: (name: string) => string | null
   readonly has: (name: string) => boolean
   readonly set: (name: string, value: string) => void
+  readonly getSetCookie: () => string[]
   readonly forEach: (
     callbackfn: (value: string, key: string, iterable: Headers) => void,
     thisArg?: unknown
diff --git a/types/header.d.ts b/types/header.d.ts
new file mode 100644
index 00000000000..bfdb3296d4d
--- /dev/null
+++ b/types/header.d.ts
@@ -0,0 +1,4 @@
+/**
+ * The header type declaration of `undici`.
+ */
+export type IncomingHttpHeaders = Record<string, string | string[] | undefined>;
diff --git a/types/mock-interceptor.d.ts b/types/mock-interceptor.d.ts
index 9dc423c0600..6b3961c0482 100644
--- a/types/mock-interceptor.d.ts
+++ b/types/mock-interceptor.d.ts
@@ -1,4 +1,4 @@
-import { IncomingHttpHeaders } from 'http'
+import { IncomingHttpHeaders } from './header'
 import Dispatcher from './dispatcher';
 import { BodyInit, Headers } from './fetch'
 
diff --git a/types/proxy-agent.d.ts b/types/proxy-agent.d.ts
index f5874716f72..96b26381ced 100644
--- a/types/proxy-agent.d.ts
+++ b/types/proxy-agent.d.ts
@@ -1,6 +1,9 @@
 import Agent from './agent'
 import buildConnector from './connector';
+import Client from './client'
 import Dispatcher from './dispatcher'
+import { IncomingHttpHeaders } from './header'
+import Pool from './pool'
 
 export default ProxyAgent
 
@@ -19,7 +22,9 @@ declare namespace ProxyAgent {
      */
     auth?: string;
     token?: string;
+    headers?: IncomingHttpHeaders;
     requestTls?: buildConnector.BuildOptions;
     proxyTls?: buildConnector.BuildOptions;
+    clientFactory?(origin: URL, opts: object): Dispatcher;
   }
 }
diff --git a/types/websocket.d.ts b/types/websocket.d.ts
index 25c46a14c37..7524cbda6c4 100644
--- a/types/websocket.d.ts
+++ b/types/websocket.d.ts
@@ -1,5 +1,7 @@
 /// <reference types="node" />
 
+import type { Blob } from 'buffer'
+import type { MessagePort } from 'worker_threads'
 import {
   EventTarget,
   Event,